# Tuesday, January17, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 600 Q 1 Order No.: G1201037 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 1/3/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 17-Jan-12 Date: 

# Geochemical Testing
Project: Keystone 600 Q1 CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1201037 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 600 Q1 Client Sample ID: Outfall 101

Collection Date: 1/3/2012 7:30:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1201037
Lab ID: G1201037-001

DF 

# Geochemical Testing Date: 17-Jan-12

Received Date: 1/3/2012 6:29:22 PM 

# Laboratory Results

Sampled By : Client

MC
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 1/4/2012 7:13:31 AM 1 mg/L 1 < 1 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 1/4/2012 20 mg/L 1 26700 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: SEM

BOD 5-day 1/4/2011 11:55:00 AM 2 mg/L 1.5 2 0 Finish Date/Time 1/4/2011 11:55:00 AM 0 mg/L 1.5 1/9/2011 11:50 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 1/10/2012 1:01:00 PM 1000 mg/L 200 14300 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 1/5/2012 2:57:00 AM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 1/5/2012 2:57:00 AM 0.02 mg/L 1 0.06 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 1/4/2012 1:48:36 PM 0.0002 mg/L 1 < 0.0002 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 1/5/2012 2:11:00 AM 0.1 mg/L 1 < 0.1 0 Arsenic 1/5/2012 2:11:00 AM 0.02 mg/L 1 < 0.02 0 Beryllium 1/5/2012 2:11:00 AM 0.001 mg/L 1 < 0.001 0.8 Boron 1/5/2012 1:34:00 PM 2.50 mg/L 50 376 0 Cadmium 1/5/2012 2:11:00 AM 0.002 mg/L 1 0.002 0 Chromium 1/5/2012 2:11:00 AM 0.01 mg/L 1 < 0.01 0 Copper 1/5/2012 2:11:00 AM 0.01 mg/L 1 < 0.01 0.1 Iron 1/5/2012 2:11:00 AM 0.05 mg/L 1 < 0.05 0 Lead 1/5/2012 2:11:00 AM 0.02 mg/L 1 < 0.02 0.1 Manganese 1/5/2012 1:50:00 PM 0.10 mg/L 10 85.6 0 Nickel 1/5/2012 2:11:00 AM 0.01 mg/L 1 0.02 0 Selenium 1/5/2012 2:11:00 AM 0.02 mg/L 1 0.08 3.4 Silver 1/5/2012 2:11:00 AM 0.005 mg/L 1 < 0.005 0.1 Zinc 1/5/2012 2:11:00 AM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 1/6/2011 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: DSZ

Oil & Grease 1/6/2012 7:33:00 AM 5 mg/L 1 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 600 Q1 Client Sample ID: FGD Influent

Collection Date: 1/3/2012 7:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1201037
Lab ID: G1201037-002

DF 

# Geochemical Testing Date: 17-Jan-12

Received Date: 1/3/2012 6:29:22 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MC
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 1/4/2012 7:44:00 AM 200 mg/L 10 33400 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 1/4/2012 7:13:36 AM 100 mg/L 20 31000 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: SEM

BOD 5-day 1/4/2011 11:55:00 AM 6 mg/L 6 33 0 Finish Date/Time 1/4/2011 11:55:00 AM 0 mg/L 6 1/9/2011 11:50 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 1/10/2012 1:01:00 PM 1000 mg/L 200 15900 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 1/5/2012 3:27:00 AM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 1/5/2012 3:27:00 AM 0.02 mg/L 1 0.68 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 1/4/2012 2:01:49 PM 0.10 mg/L 500 0.54 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 1/7/2012 3:11:00 PM 1.0 mg/L 1 527 0 Arsenic 1/7/2012 3:11:00 PM 0.20 mg/L 1 2.60 0 Beryllium 1/7/2012 3:11:00 PM 0.010 mg/L 1 0.071 0 Boron 1/9/2012 1:37:00 PM 5.00 mg/L 10 451 0 Cadmium 1/7/2012 3:11:00 PM 0.020 mg/L 1 0.037 0 Chromium 1/7/2012 3:11:00 PM 0.10 mg/L 1 3.27 0 Copper 1/7/2012 3:11:00 PM 0.10 mg/L 1 2.09 0 Iron 1/9/2012 1:37:00 PM 5.00 mg/L 10 3370 0 Lead 1/7/2012 3:11:00 PM 0.20 mg/L 1 1.10 0 Manganese 1/9/2012 1:37:00 PM 1.00 mg/L 10 591 0 Nickel 1/7/2012 3:11:00 PM 0.10 mg/L 1 6.47 0 Selenium 1/7/2012 3:11:00 PM 0.20 mg/L 1 4.00 0 Silver 1/7/2012 3:11:00 PM 0.050 mg/L 1 0.146 0 Zinc 1/7/2012 3:11:00 PM 0.10 mg/L 1 7.30 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 1/12/2012 0.02 mg/L 1 3.21 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: DSZ

Oil & Grease 1/6/2012 7:33:00 AM 19 mg/L 3.7 < 19 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Wednesday, January 25, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 Q(b) Order No.: G1201351 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 1/10/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 25-Jan-12 Date: 

# Geochemical Testing
Project: Keystone 611 Q(b) CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1201351 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 Q(b) Client Sample ID: Outfall 101

Collection Date: 1/10/2012 10:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1201351
Lab ID: G1201351-001

DF 

# Geochemical Testing Date: 25-Jan-12

Received Date: 1/10/2012 7:03:41 PM 

# Laboratory Results

Sampled By : Client

MC
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 1/11/2012 9:15:12 AM 5 mg/L 1 < 5 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 1/11/2012 9:20:00 AM 100 mg/L 5 25300 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 1/11/2012 11:30:00 A M 2 mg/L 1.5 < 2 25 Finish Date/Time 1/11/2012 11:30:00 A M 0 mg/L 1.5 1/16/2012 11:05 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 1/13/2012 11:56:00 A M 1000 mg/L 200 14400 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 1/12/2012 3:43:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 1/11/2012 8:33:00 PM 0.02 mg/L 1 0.07 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 1/12/2012 11:17:42 A M 0.0002 mg/L 1 < 0.0002 0 

### INORGANIC METALS EPA 200.7 Analyst: MS

Aluminum 1/11/2012 8:09:00 PM 0.1 mg/L 1 < 0.1 0 Arsenic 1/11/2012 8:09:00 PM 0.02 mg/L 1 < 0.02 0 Beryllium 1/11/2012 8:09:00 PM 0.001 mg/L 1 < 0.001 0.8 Boron 1/12/2012 2:29:00 PM 2.50 mg/L 50 326 0 Cadmium 1/11/2012 8:09:00 PM 0.002 mg/L 1 0.002 0 Chromium 1/11/2012 8:09:00 PM 0.01 mg/L 1 < 0.01 0 Copper 1/11/2012 8:09:00 PM 0.01 mg/L 1 < 0.01 0.1 Iron 1/12/2012 3:19:00 PM 0.05 mg/L 1 < 0.05 0 Lead 1/11/2012 8:09:00 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 1/12/2012 2:33:00 PM 0.20 mg/L 20 75.6 0 Nickel 1/11/2012 8:09:00 PM 0.01 mg/L 1 0.02 0 Selenium 1/11/2012 8:09:00 PM 0.02 mg/L 1 0.09 3.4 Silver 1/11/2012 8:09:00 PM 0.005 mg/L 1 < 0.005 0 Zinc 1/11/2012 8:09:00 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 1/16/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: DSZ

Oil & Grease 1/13/2012 9:20:00 AM 5 mg/L 1.01 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 Q(b) Client Sample ID: FGD Influent

Collection Date: 1/10/2012 10:00:00 AM Matrix: Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1201351
Lab ID: G1201351-002

DF 

# Geochemical Testing Date: 25-Jan-12

Received Date: 1/10/2012 7:03:41 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MC
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 1/11/2012 9:21:00 AM 200 mg/L 10 31200 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 1/11/2012 9:13:16 AM 100 mg/L 20 23200 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 1/11/2012 11:30:00 A M 6 mg/L 6 26 0 Finish Date/Time 1/11/2012 11:30:00 A M 0 mg/L 6 1/16/2012 11:05 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 1/13/2012 11:56:00 A M 1000 mg/L 200 16700 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 1/12/2012 4:05:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 1/11/2012 8:45:00 PM 0.02 mg/L 1 0.14 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 1/12/2012 11:19:54 A M 0.10 mg/L 500 0.49 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 1/16/2012 10:52:00 A M 1.0 mg/L 1 511 0 Arsenic 1/16/2012 10:52:00 A M 0.20 mg/L 1 2.41 0 Beryllium 1/16/2012 10:52:00 A M 0.010 mg/L 1 0.066 0 Boron 1/16/2012 1:23:00 PM 5.00 mg/L 10 49.4 0 Cadmium 1/16/2012 10:52:00 A M 0.020 mg/L 1 0.066 0 Chromium 1/16/2012 10:52:00 A M 0.10 mg/L 1 3.18 0 Copper 1/16/2012 10:52:00 A M 0.10 mg/L 1 2.09 0 Iron 1/16/2012 1:23:00 PM 5.00 mg/L 10 316 0 Lead 1/16/2012 10:52:00 A M 0.20 mg/L 1 1.11 0 Manganese 1/16/2012 1:23:00 PM 1.00 mg/L 10 62.9 0 Nickel 1/16/2012 10:52:00 A M 0.10 mg/L 1 6.74 0 Selenium 1/16/2012 10:52:00 A M 0.20 mg/L 1 4.03 0 Silver 1/16/2012 10:52:00 A M 0.050 mg/L 1 < 0.050 0 Zinc 1/16/2012 10:52:00 A M 0.10 mg/L 1 7.12 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 1/16/2012 0.02 mg/L 1 3.18 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: DSZ

Oil & Grease 1/13/2012 9:20:00 AM 10 mg/L 1.96 < 10 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Thursday, January26, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1201655 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 1/17/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 26-Jan-12 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1201655 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 1/17/2012 9:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1201655
Lab ID: G1201655-001

DF 

# Geochemical Testing Date: 26-Jan-12

Received Date: 1/17/2012 7:01:04 PM 

# Laboratory Results

Sampled By : Client

MC
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 1/18/2012 12:04:40 P M 1 mg/L 1 6 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 1/18/2012 12:04:00 P M 100 mg/L 5 31000 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 1/18/2012 11:40:00 A M 2 mg/L 1.5 < 2 25 Finish Date/Time 1/18/2012 11:40:00 A M 0 mg/L 1.5 1/23/2012 12:20 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 1/23/2012 5:36:00 PM 1000 mg/L 200 15400 0 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Iron, dissolved 1/21/2012 12:07:00 A M 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 1/21/2012 12:07:00 A M 0.02 mg/L 1 0.07 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 1/19/2012 10:08:33 A M 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Aluminum 1/20/2012 11:56:00 P M 0.1 mg/L 1 < 0.1 0 Arsenic 1/20/2012 11:56:00 P M 0.02 mg/L 1 < 0.02 0 Beryllium 1/20/2012 11:56:00 P M 0.001 mg/L 1 < 0.001 0.8 Boron 1/23/2012 2:51:00 PM 2.50 mg/L 50 398 0 Cadmium 1/20/2012 11:56:00 P M 0.002 mg/L 1 0.002 0 Chromium 1/20/2012 11:56:00 P M 0.01 mg/L 1 < 0.01 0 Copper 1/20/2012 11:56:00 P M 0.01 mg/L 1 < 0.01 0.1 Iron 1/20/2012 11:56:00 P M 0.05 mg/L 1 < 0.05 0 Lead 1/20/2012 11:56:00 P M 0.02 mg/L 1 < 0.02 0.1 Manganese 1/23/2012 3:25:00 PM 0.10 mg/L 10 97.2 0 Nickel 1/20/2012 11:56:00 P M 0.01 mg/L 1 0.02 0 Selenium 1/20/2012 11:56:00 P M 0.02 mg/L 1 0.07 3.4 Silver 1/20/2012 11:56:00 P M 0.005 mg/L 1 < 0.005 0.1 Zinc 1/20/2012 11:56:00 P M 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 1/25/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: DSZ

Oil & Grease 1/19/2012 6:53:00 AM 9 mg/L 1.89 < 9 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 1/17/2012 9:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1201655
Lab ID: G1201655-002

DF 

# Geochemical Testing Date: 26-Jan-12

Received Date: 1/17/2012 7:01:04 PM 

# Laboratory Results

Sampled By : Client

MC
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 1/18/2012 12:04:41 P M 100 mg/L 100 21800 0 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 1/18/2012 12:04:00 P M 200 mg/L 10 33000 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 1/18/2012 11:40:00 A M 6 mg/L 6 21 0 Finish Date/Time 1/18/2012 11:40:00 A M 0 mg/L 6 1/23/2012 12:20 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 1/23/2012 5:36:00 PM 1250 mg/L 250 19000 0 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Iron, dissolved 1/21/2012 12:19:00 A M 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 1/21/2012 12:19:00 A M 0.02 mg/L 1 0.63 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 1/19/2012 10:10:45 A M 0.10 mg/L 500 0.66 0 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Aluminum 1/21/2012 12:53:00 P M 1.0 mg/L 1 511 0 Arsenic 1/21/2012 12:53:00 P M 0.20 mg/L 1 2.48 0 Beryllium 1/21/2012 12:53:00 P M 0.010 mg/L 1 0.063 0 Boron 1/23/2012 3:33:00 PM 5.00 mg/L 10 < 5.00 0 Cadmium 1/21/2012 12:53:00 P M 0.020 mg/L 1 0.090 0 Chromium 1/21/2012 12:53:00 P M 0.10 mg/L 1 3.02 0 Copper 1/21/2012 12:53:00 P M 0.10 mg/L 1 2.13 0 Iron 1/23/2012 3:33:00 PM 5.00 mg/L 10 < 5.00 0 Lead 1/21/2012 12:53:00 P M 0.20 mg/L 1 1.08 0 Manganese 1/23/2012 3:33:00 PM 1.00 mg/L 10 < 1.00 0 Nickel 1/21/2012 12:53:00 P M 0.10 mg/L 1 6.95 0 Selenium 1/21/2012 12:53:00 P M 0.20 mg/L 1 4.24 0 Silver 1/21/2012 12:53:00 P M 0.050 mg/L 1 < 0.050 0 Zinc 1/21/2012 12:53:00 P M 0.10 mg/L 1 6.90 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 1/25/2012 0.02 mg/L 1 3.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: DSZ

Oil & Grease 1/19/2012 6:54:00 AM 9 mg/L 1.89 < 9 15

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Monday, February06, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1201964 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 1/24/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 06-Feb-12 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1201964 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 1/24/2012 9:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1201964
Lab ID: G1201964-001

DF 

# Geochemical Testing Date: 06-Feb-12

Received Date: 1/24/2012 6:49:35 PM 

# Laboratory Results

Sampled By : Client

MC
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 1/25/2012 10:15:52 A M 1 mg/L 1 1 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 1/25/2012 10:16:05 A M 100 mg/L 5 16100 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: KMW

BOD 5-day 1/25/2012 11:23:00 A M 3 mg/L 3 < 3 25 Finish Date/Time 1/25/2012 11:23:00 A M 0 mg/L 3 1/30/2012 10:50 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 1/25/2012 1:21:00 PM 1000 mg/L 200 16100 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 1/27/2012 7:23:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 1/27/2012 2:46:00 AM 0.02 mg/L 1 0.08 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 1/26/2012 9:24:18 AM 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 1/27/2012 2:33:00 AM 0.1 mg/L 1 < 0.1 0 Arsenic 1/27/2012 2:33:00 AM 0.02 mg/L 1 < 0.02 0 Beryllium 1/27/2012 7:19:00 PM 0.001 mg/L 1 < 0.001 0.8 Boron 1/27/2012 3:11:00 PM 2.50 mg/L 50 382 0 Cadmium 1/27/2012 2:33:00 AM 0.002 mg/L 1 0.002 0 Chromium 1/27/2012 7:19:00 PM 0.01 mg/L 1 < 0.01 0 Copper 1/27/2012 2:33:00 AM 0.01 mg/L 1 < 0.01 0.1 Iron 1/27/2012 7:19:00 PM 0.05 mg/L 1 < 0.05 0 Lead 1/27/2012 2:33:00 AM 0.02 mg/L 1 < 0.02 0.1 Manganese 1/27/2012 7:15:00 PM 0.10 mg/L 10 97.4 0 Nickel 1/27/2012 2:33:00 AM 0.01 mg/L 1 0.01 0 Selenium 1/27/2012 2:33:00 AM 0.02 mg/L 1 0.08 3.4 Silver 1/27/2012 2:33:00 AM 0.005 mg/L 1 < 0.005 0.1 Zinc 1/27/2012 2:33:00 AM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 2/1/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: DSZ

Oil & Grease 1/25/2012 1:28:00 PM 5 mg/L 1 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 1/24/2012 8:45:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1201964
Lab ID: G1201964-002

DF 

# Geochemical Testing Date: 06-Feb-12

Received Date: 1/24/2012 6:49:35 PM 

# Laboratory Results

Sampled By : Client

MC
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 2/1/2012 200 mg/L 10 33900 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 1/25/2012 10:15:53 A M 100 mg/L 20 5940 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: KMW

BOD 5-day 1/25/2012 11:23:00 A M 2 mg/L 1.5 10 0 Finish Date/Time 1/25/2012 11:23:00 A M 0 mg/L 1.5 1/30/2012 10:50 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 1/25/2012 1:21:00 PM 2500 mg/L 500 19400 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 1/27/2012 7:27:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 1/27/2012 2:58:00 AM 0.02 mg/L 1 0.34 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 1/26/2012 9:26:26 AM 0.10 mg/L 500 0.15 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 1/26/2012 6:46:00 AM 1.0 mg/L 1 98.3 0 Arsenic 1/26/2012 6:46:00 AM 0.20 mg/L 1 0.48 0 Beryllium 1/26/2012 6:46:00 AM 0.010 mg/L 1 0.012 0 Boron 1/26/2012 3:35:00 PM 5.00 mg/L 10 447 0 Cadmium 1/26/2012 6:46:00 AM 0.020 mg/L 1 0.059 0 Chromium 1/26/2012 6:46:00 AM 0.10 mg/L 1 0.61 0 Copper 1/26/2012 6:46:00 AM 0.10 mg/L 1 0.41 0 Iron 1/26/2012 6:46:00 AM 0.50 mg/L 1 623 0 Lead 1/26/2012 6:46:00 AM 0.20 mg/L 1 < 0.20 0 Manganese 1/26/2012 3:35:00 PM 1.00 mg/L 10 561 0 Nickel 1/26/2012 6:46:00 AM 0.10 mg/L 1 3.70 0 Selenium 1/26/2012 6:46:00 AM 0.20 mg/L 1 1.38 0 Silver 1/26/2012 6:46:00 AM 0.050 mg/L 1 < 0.050 0 Zinc 1/26/2012 6:46:00 AM 0.10 mg/L 1 1.57 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 2/1/2012 0.02 mg/L 1 0.61 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: DSZ

Oil & Grease 1/25/2012 2:51:00 PM 19 mg/L 3.85 < 19 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Friday, February10, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1201B92 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 1/31/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 10-Feb-12 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1201B92 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 1/31/2012 9:30:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1201B92
Lab ID: G1201B92-001

DF 

# Geochemical Testing Date: 10-Feb-12

Received Date: 1/31/2012 5:06:32 PM 

# Laboratory Results

Sampled By : Client

MC
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 2/1/2012 10:45:39 AM 1 mg/L 1 10 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 2/1/2012 10:33:41 AM 100 mg/L 5 28000 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: SEM

BOD 5-day 2/1/2012 8:30:00 AM 2 mg/L 1.5 < 2 25 Finish Date/Time 2/1/2012 8:30:00 AM 0 mg/L 1.5 2/6/2012 07:45 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 2/2/2012 4:59:00 PM 1000 mg/L 200 17000 0 

### INORGANIC METALS EPA 200.7 Analyst: MS

Iron, dissolved 2/1/2012 6:06:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 2/1/2012 6:06:00 PM 0.02 mg/L 1 0.09 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 2/1/2012 11:37:43 AM 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: MS

Aluminum 2/1/2012 5:52:00 PM 0.1 mg/L 1 < 0.1 0 Arsenic 2/1/2012 5:52:00 PM 0.02 mg/L 1 < 0.02 0 Beryllium 2/1/2012 5:52:00 PM 0.001 mg/L 1 < 0.001 0.8 Boron 2/2/2012 10:24:00 AM 5.00 mg/L 100 340 0 Cadmium 2/1/2012 5:52:00 PM 0.002 mg/L 1 0.002 0 Chromium 2/1/2012 5:52:00 PM 0.01 mg/L 1 < 0.01 0 Copper 2/1/2012 5:52:00 PM 0.01 mg/L 1 < 0.01 0.1 Iron 2/1/2012 5:52:00 PM 0.05 mg/L 1 < 0.05 0 Lead 2/1/2012 5:52:00 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 2/2/2012 11:01:00 AM 0.10 mg/L 10 85.5 0 Nickel 2/1/2012 5:52:00 PM 0.01 mg/L 1 0.02 0 Selenium 2/1/2012 5:52:00 PM 0.02 mg/L 1 0.09 3.4 Silver 2/1/2012 5:52:00 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 2/1/2012 5:52:00 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 2/6/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: DSZ

Oil & Grease S 2/1/2012 12:01:00 PM 5 mg/L 1 < 5 15 NOTES: S - Spike recovery indicates a possible matrix effect. The method is in control as indicated by the LCS.

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 1/31/2012 9:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1201B92
Lab ID: G1201B92-003

DF 

# Geochemical Testing Date: 10-Feb-12

Received Date: 1/31/2012 5:06:32 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MC
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 2/2/2012 4:30:53 PM 200 mg/L 1 36800 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 2/1/2012 10:45:39 AM 100 mg/L 20 19100 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: SEM

BOD 5-day 2/1/2012 8:30:00 AM 2 mg/L 1.5 8 0 Finish Date/Time 2/1/2012 8:30:00 AM 0 mg/L 1.5 2/6/2012 07:45 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 2/2/2012 4:59:00 PM 1250 mg/L 250 20600 0 

### INORGANIC METALS USGS I-1230-85 Analyst: SAG

Hexavalent Chromium 1/31/2012 6:20:00 PM 0.020 mg/L 1 < 0.020 0 

### INORGANIC METALS EPA 200.7 Analyst: MS

Iron, dissolved 2/1/2012 6:20:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 2/1/2012 6:20:00 PM 0.02 mg/L 1 < 0.02 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 2/1/2012 12:58:47 PM 0.10 mg/L 500 0.57 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 2/4/2012 3:24:00 AM 1.0 mg/L 1 423 0 Arsenic 2/4/2012 3:24:00 AM 0.20 mg/L 1 1.87 0 Beryllium 2/4/2012 3:24:00 AM 0.010 mg/L 1 0.044 0 Boron 2/6/2012 3:47:00 PM 5.00 mg/L 10 514 0 Cadmium 2/4/2012 3:24:00 AM 0.020 mg/L 1 0.106 0 Chromium 2/4/2012 3:24:00 AM 0.10 mg/L 1 2.53 0 Copper 2/6/2012 3:59:00 PM 0.10 mg/L 1 1.82 0 Iron 2/6/2012 3:47:00 PM 5.00 mg/L 10 2540 0 Lead 2/4/2012 3:24:00 AM 0.20 mg/L 1 0.85 0 Manganese 2/6/2012 3:47:00 PM 1.00 mg/L 10 635 0 Nickel 2/4/2012 3:24:00 AM 0.10 mg/L 1 6.22 0 Selenium 2/4/2012 3:24:00 AM 0.20 mg/L 1 4.04 0 Silver 2/4/2012 3:24:00 AM 0.050 mg/L 1 < 0.050 0 Zinc 2/4/2012 3:24:00 AM 0.10 mg/L 1 5.73 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 2/9/2012 0.02 mg/L 1 2.53 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: DSZ

Oil & Grease 2/1/2012 1:52:00 PM 20 mg/L 4 < 20 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Thursday, February16, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 M(b) Order No.: G1202293 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 2/7/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 16-Feb-12 Date: 

# Geochemical Testing
Project: Keystone 611 M(b) CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1202293 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 M(b) Client Sample ID: Outfall 101

Collection Date: 2/7/2012 11:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1202293
Lab ID: G1202293-001

DF 

# Geochemical Testing Date: 16-Feb-12

Received Date: 2/7/2012 5:56:35 PM 

# Laboratory Results

Sampled By : Client

MC
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 2/8/2012 2:53:10 PM 1 mg/L 1 3 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 2/8/2012 2:44:09 PM 100 mg/L 5 36500 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: SEM

BOD 5-day 2/8/2012 2:10:00 PM 2 mg/L 1.5 < 2 25 Finish Date/Time 2/8/2012 2:10:00 PM 0 mg/L 1.5 2/13/2012 13:20 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 2/13/2012 11:36:00 A M 1000 mg/L 200 15900 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 2/10/2012 1:04:00 AM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 2/10/2012 1:04:00 AM 0.02 mg/L 1 0.05 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 2/9/2012 11:45:33 AM 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 2/10/2012 1:59:00 AM 0.1 mg/L 1 10.5 0 Arsenic 2/10/2012 1:59:00 AM 0.02 mg/L 1 < 0.02 0 Beryllium 2/10/2012 1:59:00 AM 0.001 mg/L 1 < 0.001 0.8 Boron 2/10/2012 2:53:00 PM 5.00 mg/L 100 327 0 Cadmium 2/10/2012 1:59:00 AM 0.002 mg/L 1 0.004 0 Chromium 2/10/2012 1:59:00 AM 0.01 mg/L 1 < 0.01 0 Copper 2/10/2012 7:22:00 PM 0.01 mg/L 1 < 0.01 0.1 Iron 2/10/2012 1:59:00 AM 0.05 mg/L 1 < 0.05 0 Lead 2/10/2012 1:59:00 AM 0.02 mg/L 1 < 0.02 0.1 Manganese 2/10/2012 3:15:00 PM 0.10 mg/L 10 72.2 0 Nickel 2/10/2012 1:59:00 AM 0.01 mg/L 1 0.02 0 Selenium 2/10/2012 1:59:00 AM 0.02 mg/L 1 0.06 3.4 Silver 2/10/2012 1:59:00 AM 0.005 mg/L 1 < 0.005 0.1 Zinc 2/10/2012 1:59:00 AM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 2/15/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: DSZ

Oil & Grease 2/8/2012 2:29:00 PM 6 mg/L 1.18 < 6 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 M(b) Client Sample ID: FGD Influent

Collection Date: 2/7/2012 11:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1202293
Lab ID: G1202293-002

DF 

# Geochemical Testing Date: 16-Feb-12

Received Date: 2/7/2012 5:56:35 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MC
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 2/8/2012 2:44:09 PM 200 mg/L 10 40900 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 2/8/2012 2:53:06 PM 100 mg/L 20 23500 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: SEM

BOD 5-day 2/8/2012 2:10:00 PM 2 mg/L 1.5 18 0 Finish Date/Time 2/8/2012 2:10:00 PM 0 mg/L 1.5 2/13/2012 13:20 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 2/13/2012 11:36:00 A M 1000 mg/L 200 17900 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 2/10/2012 2:07:00 AM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 2/10/2012 2:07:00 AM 0.02 mg/L 1 0.10 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 2/9/2012 11:52:08 AM 0.10 mg/L 500 0.69 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 2/10/2012 10:06:00 P M 1.0 mg/L 1 516 0 Arsenic 2/10/2012 10:06:00 P M 0.20 mg/L 1 2.17 0 Beryllium 2/10/2012 10:06:00 P M 0.010 mg/L 1 0.063 0 Boron 2/13/2012 2:41:00 PM 5.00 mg/L 10 463 0 Cadmium 2/10/2012 10:06:00 P M 0.020 mg/L 1 0.083 0 Chromium 2/10/2012 10:06:00 P M 0.10 mg/L 1 3.15 0 Copper 2/10/2012 10:06:00 P M 0.10 mg/L 1 2.05 0 Iron 2/13/2012 2:41:00 PM 5.00 mg/L 10 3120 0 Lead 2/10/2012 10:06:00 P M 0.20 mg/L 1 1.05 0 Manganese 2/10/2012 10:06:00 P M 0.10 mg/L 1 461 0 Nickel 2/10/2012 10:06:00 P M 0.10 mg/L 1 6.30 0 Selenium 2/10/2012 10:06:00 P M 0.20 mg/L 1 4.32 0 Silver 2/10/2012 10:06:00 P M 0.050 mg/L 1 < 0.050 0 Zinc 2/10/2012 10:06:00 P M 0.10 mg/L 1 6.56 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 2/15/2012 0.02 mg/L 1 3.14 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: DSZ

Oil & Grease 2/8/2012 2:29:00 PM 19 mg/L 3.7 < 19 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Wednesday, February22, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1202577 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 2/14/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 22-Feb-12 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1202577 

# CASE NARRATIVE

Samples were not filtered in the field for dissolved metals; samples were lab filtered. No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 2/14/2012 10:25:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1202577
Lab ID: G1202577-001

DF 

# Geochemical Testing Date: 22-Feb-12

Received Date: 2/14/2012 6:01:25 PM 

# Laboratory Results

Sampled By : Client

MC
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 2/15/2012 12:32:38 P M 1 mg/L 1 6 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 2/15/2012 12:32:56 P M 100 mg/L 5 26600 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: SEM

BOD 5-day 2/15/2012 10:40:00 A M 2 mg/L 1.5 < 2 25 Finish Date/Time 2/15/2012 10:40:00 A M 0 mg/L 1.5 2/20/2012 10:30 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 2/16/2012 10:11:00 A M 1000 mg/L 200 14200 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 2/17/2012 5:05:00 AM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 2/17/2012 5:05:00 AM 0.02 mg/L 1 0.10 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 2/16/2012 8:32:52 AM 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 2/17/2012 4:58:00 AM 0.1 mg/L 1 < 0.1 0 Arsenic 2/17/2012 4:58:00 AM 0.02 mg/L 1 < 0.02 0 Beryllium 2/17/2012 4:58:00 AM 0.001 mg/L 1 < 0.001 0.8 Boron 2/17/2012 4:00:00 PM 2.50 mg/L 50 294 0 Cadmium 2/17/2012 4:58:00 AM 0.002 mg/L 1 < 0.002 0 Chromium 2/17/2012 4:58:00 AM 0.01 mg/L 1 < 0.01 0 Copper 2/17/2012 4:58:00 AM 0.01 mg/L 1 < 0.01 0.1 Iron 2/17/2012 4:58:00 AM 0.05 mg/L 1 < 0.05 0 Lead 2/17/2012 4:58:00 AM 0.02 mg/L 1 < 0.02 0.1 Manganese 2/17/2012 4:58:00 AM 0.01 mg/L 1 30.1 0 Nickel 2/17/2012 4:58:00 AM 0.01 mg/L 1 0.01 0 Selenium 2/17/2012 4:58:00 AM 0.02 mg/L 1 0.10 3.4 Silver 2/17/2012 4:58:00 AM 0.005 mg/L 1 < 0.005 0.1 Zinc 2/17/2012 4:58:00 AM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 2/21/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: DSZ

Oil & Grease 2/16/2012 12:18:00 P M 5 mg/L 1 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 2/14/2012 10:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1202577
Lab ID: G1202577-002

DF 

# Geochemical Testing Date: 22-Feb-12

Received Date: 2/14/2012 6:01:25 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MC
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 2/15/2012 12:32:56 P M 200 mg/L 10 24700 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 2/15/2012 12:32:37 P M 100 mg/L 20 4580 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: SEM

BOD 5-day 2/15/2012 10:40:00 A M 2 mg/L 1.5 3 0 Finish Date/Time 2/15/2012 10:40:00 A M 0 mg/L 1.5 2/20/2012 10:30 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 2/16/2012 10:11:00 A M 1000 mg/L 200 13500 0 

### INORGANIC METALS USGS I-1230-85 Analyst: KMW

Hexavalent Chromium 2/14/2012 6:35:00 PM 0.020 mg/L 1 < 0.020 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 2/17/2012 5:24:00 AM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 2/17/2012 5:24:00 AM 0.02 mg/L 1 0.24 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 2/16/2012 8:35:03 AM 0.10 mg/L 500 0.17 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 2/20/2012 4:16:00 PM 1.0 mg/L 1 94.8 0 Arsenic 2/20/2012 4:16:00 PM 0.20 mg/L 1 0.25 0 Beryllium 2/20/2012 4:16:00 PM 0.010 mg/L 1 < 0.010 0 Boron 2/21/2012 2:57:00 PM 5.00 mg/L 10 310 0 Cadmium 2/20/2012 4:16:00 PM 0.020 mg/L 1 0.046 0 Chromium 2/20/2012 4:16:00 PM 0.10 mg/L 1 0.52 0 Copper 2/20/2012 4:16:00 PM 0.10 mg/L 1 0.36 0 Iron 2/20/2012 4:16:00 PM 0.50 mg/L 1 421 0 Lead 2/20/2012 4:16:00 PM 0.20 mg/L 1 < 0.20 0 Manganese 2/20/2012 4:16:00 PM 0.10 mg/L 1 245 0 Nickel 2/20/2012 4:16:00 PM 0.10 mg/L 1 2.25 0 Selenium 2/20/2012 4:16:00 PM 0.20 mg/L 1 1.22 0 Silver 2/20/2012 4:16:00 PM 0.050 mg/L 1 < 0.050 0 Zinc 2/20/2012 4:16:00 PM 0.10 mg/L 1 1.04 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 2/21/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: DSZ

Oil & Grease 2/16/2012 12:18:00 P M 19 mg/L 3.7 < 19 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Thursday, March 01, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1202831 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 2/21/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 01-Mar-12 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1202831 

# CASE NARRATIVE

Samples were not filtered in the field for dissolved metals; samples were lab filtered. No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 2/21/2012 11:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1202831
Lab ID: G1202831-001

DF 

# Geochemical Testing Date: 01-Mar-12

Received Date: 2/21/2012 5:51:58 PM 

# Laboratory Results

Sampled By : Client

MC
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 2/22/2012 5:22:34 PM 1 mg/L 1 2 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 2/22/2012 5:20:34 PM 100 mg/L 5 21200 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 2/22/2012 9:00:00 AM 2 mg/L 1.5 < 2 25 Finish Date/Time 2/22/2012 9:00:00 AM 0 mg/L 1.5 2/27/2012 09:00 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 2/23/2012 3:11:00 PM 1000 mg/L 200 12200 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 2/22/2012 5:09:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 2/22/2012 5:09:00 PM 0.02 mg/L 1 0.07 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 2/24/2012 9:55:53 AM 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 2/22/2012 5:25:00 PM 0.1 mg/L 1 < 0.1 0 Arsenic 2/22/2012 5:25:00 PM 0.02 mg/L 1 < 0.02 0 Beryllium 2/22/2012 5:25:00 PM 0.001 mg/L 1 < 0.001 0.8 Boron 2/23/2012 3:45:00 PM 2.50 mg/L 50 249 0 Cadmium 2/22/2012 5:25:00 PM 0.002 mg/L 1 < 0.002 0 Chromium 2/22/2012 5:25:00 PM 0.01 mg/L 1 < 0.01 0 Copper 2/22/2012 5:25:00 PM 0.01 mg/L 1 < 0.01 0.1 Iron 2/22/2012 5:25:00 PM 0.05 mg/L 1 < 0.05 0 Lead 2/22/2012 5:25:00 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 2/22/2012 5:25:00 PM 0.01 mg/L 1 8.19 0 Nickel 2/22/2012 5:25:00 PM 0.01 mg/L 1 0.02 0 Selenium 2/22/2012 5:25:00 PM 0.02 mg/L 1 0.09 3.4 Silver 2/22/2012 5:25:00 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 2/22/2012 5:25:00 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 2/28/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: DSZ

Oil & Grease 2/23/2012 7:47:00 AM 5 mg/L 1 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 2/21/2012 10:45:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1202831
Lab ID: G1202831-002

DF 

# Geochemical Testing Date: 01-Mar-12

Received Date: 2/21/2012 5:51:58 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MC
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 2/22/2012 5:20:34 PM 200 mg/L 10 26100 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 2/22/2012 5:22:34 PM 100 mg/L 20 3900 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 2/22/2012 9:00:00 AM 2 mg/L 1.5 4 0 Finish Date/Time 2/22/2012 9:00:00 AM 0 mg/L 1.5 2/27/2012 09:00 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 2/23/2012 3:11:00 PM 1000 mg/L 200 12500 0 

### INORGANIC METALS USGS I-1230-85 Analyst: SEM

Hexavalent Chromium 2/21/2012 6:30:00 PM 0.020 mg/L 1 < 0.020 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 2/22/2012 5:17:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 2/22/2012 5:17:00 PM 0.02 mg/L 1 0.13 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 2/24/2012 9:58:05 AM 0.10 mg/L 500 0.33 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 2/28/2012 8:08:00 AM 1.0 mg/L 1 89.0 0 Arsenic 2/28/2012 8:08:00 AM 0.20 mg/L 1 < 0.20 0 Beryllium 2/28/2012 8:08:00 AM 0.010 mg/L 1 < 0.010 0 Boron 2/28/2012 8:08:00 AM 0.50 mg/L 1 256 0 Cadmium 2/28/2012 8:08:00 AM 0.020 mg/L 1 0.027 0 Chromium 2/28/2012 8:08:00 AM 0.10 mg/L 1 0.43 0 Copper 2/28/2012 8:08:00 AM 0.10 mg/L 1 0.38 0 Iron 2/28/2012 7:15:00 PM 0.50 mg/L 1 259 0 Lead 2/28/2012 8:08:00 AM 0.20 mg/L 1 < 0.20 0 Manganese 2/28/2012 8:08:00 AM 0.10 mg/L 1 144 0 Nickel 2/28/2012 8:08:00 AM 0.10 mg/L 1 1.71 0 Selenium 2/28/2012 8:08:00 AM 0.20 mg/L 1 1.00 0 Silver 2/28/2012 8:08:00 AM 0.050 mg/L 1 < 0.050 0 Zinc 2/28/2012 7:15:00 PM 0.10 mg/L 1 0.76 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 2/29/2012 0.02 mg/L 1 0.43 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: DSZ

Oil & Grease 2/23/2012 12:13:00 P M 18 mg/L 3.57 < 18 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Wednesday, March 07, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1202A63 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 2/28/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 07-Mar-12 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1202A63 

# CASE NARRATIVE

Samples were not filtered in the field for dissolved metals; samples were lab filtered. No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 2/28/2012 9:30:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1202A63
Lab ID: G1202A63-001

DF 

# Geochemical Testing Date: 07-Mar-12

Received Date: 2/28/2012 5:29:08 PM 

# Laboratory Results

Sampled By : Client

MC
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 2/29/2012 9:13:42 AM 1 mg/L 1 3 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 2/29/2012 9:13:53 AM 100 mg/L 5 21800 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 2/29/2012 10:25:00 A M 2 mg/L 1.5 < 2 25 Finish Date/Time 2/29/2012 10:25:00 A M 0 mg/L 1.5 3/5/2012 11:13 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 3/2/2012 6:33:00 PM 1000 mg/L 200 13500 0 

### INORGANIC METALS EPA 200.7 Analyst: JAS

Iron, dissolved 3/1/2012 10:57:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 3/1/2012 10:57:00 PM 0.02 mg/L 1 0.08 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 3/2/2012 9:47:58 AM 0.0002 mg/L 1 < 0.0002 0 

### INORGANIC METALS EPA 200.7 Analyst: JAS

Aluminum 3/1/2012 10:42:00 PM 0.1 mg/L 1 < 0.1 0 Arsenic 3/1/2012 10:42:00 PM 0.02 mg/L 1 < 0.02 0 Beryllium 3/1/2012 10:42:00 PM 0.001 mg/L 1 < 0.001 0.8 Boron 3/2/2012 3:29:00 PM 2.50 mg/L 50 271 0 Cadmium 3/1/2012 10:42:00 PM 0.002 mg/L 1 < 0.002 0 Chromium 3/1/2012 10:42:00 PM 0.01 mg/L 1 < 0.01 0 Copper 3/1/2012 10:42:00 PM 0.01 mg/L 1 < 0.01 0.1 Iron 3/1/2012 10:42:00 PM 0.05 mg/L 1 < 0.05 0 Lead 3/1/2012 10:42:00 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 3/1/2012 10:42:00 PM 0.01 mg/L 1 8.14 0 Nickel 3/1/2012 10:42:00 PM 0.01 mg/L 1 0.02 0 Selenium 3/1/2012 10:42:00 PM 0.02 mg/L 1 0.08 3.4 Silver 3/1/2012 10:42:00 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 3/1/2012 10:42:00 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 3/5/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 3/2/2012 9:01:00 AM 5 mg/L 1.03 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 2/28/2012 9:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1202A63
Lab ID: G1202A63-002

DF 

# Geochemical Testing Date: 07-Mar-12

Received Date: 2/28/2012 5:29:08 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MC
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 2/29/2012 9:13:53 AM 200 mg/L 10 27000 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 2/29/2012 9:13:47 AM 100 mg/L 20 9040 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 2/29/2012 10:25:00 A M 2 mg/L 1.5 9 0 Finish Date/Time 2/29/2012 10:25:00 A M 0 mg/L 1.5 3/5/2012 11:13 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 3/2/2012 6:33:00 PM 1000 mg/L 200 15800 0 

### INORGANIC METALS USGS I-1230-85 Analyst: MXS

Hexavalent Chromium 2/28/2012 6:55:00 PM 0.020 mg/L 1 < 0.020 0 

### INORGANIC METALS EPA 200.7 Analyst: JAS

Iron, dissolved 3/1/2012 11:17:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 3/1/2012 11:17:00 PM 0.02 mg/L 1 0.16 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 3/2/2012 9:50:11 AM 0.10 mg/L 500 0.66 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 3/3/2012 12:28:00 AM 1.0 mg/L 1 198 0 Arsenic 3/3/2012 12:28:00 AM 0.20 mg/L 1 0.74 0 Beryllium 3/3/2012 12:28:00 AM 0.010 mg/L 1 0.013 0 Boron 3/5/2012 1:22:00 PM 10.0 mg/L 20 335 0 Cadmium 3/3/2012 12:28:00 AM 0.020 mg/L 1 < 0.020 0 Chromium 3/3/2012 12:28:00 AM 0.10 mg/L 1 1.40 0 Copper 3/3/2012 12:28:00 AM 0.10 mg/L 1 0.85 0 Iron 3/3/2012 12:28:00 AM 0.50 mg/L 1 842 0 Lead 3/3/2012 12:28:00 AM 0.20 mg/L 1 0.30 0 Manganese 3/3/2012 12:28:00 AM 0.10 mg/L 1 157 0 Nickel 3/3/2012 12:28:00 AM 0.10 mg/L 1 2.43 0 Selenium 3/3/2012 12:28:00 AM 0.20 mg/L 1 3.31 0 Silver 3/3/2012 12:28:00 AM 0.050 mg/L 1 < 0.050 0 Zinc 3/3/2012 12:28:00 AM 0.10 mg/L 1 1.99 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 3/5/2012 0.02 mg/L 1 1.40 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 3/1/2012 4:21:00 PM 19 mg/L 3.7 < 19 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Tuesday, March 13, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1203210 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 3/6/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 13-Mar-12 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1203210 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 3/6/2012 10:50:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1203210
Lab ID: G1203210-001

DF 

# Geochemical Testing Date: 13-Mar-12

Received Date: 3/6/2012 7:00:50 PM 

# Laboratory Results

Sampled By : Client

MC
PHYSICAL TESTS SM 2540D Analyst: GMG

Total suspended solids 3/7/2012 11:17:20 AM 1 mg/L 1 < 1 10 

### INORGANIC NON-METALS SM 2540 C Analyst: GMG

Total dissolved solids 3/7/2012 10:00:10 AM 20 mg/L 1 26500 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 3/7/2012 9:50:00 AM 2 mg/L 1.5 < 2 25 Finish Date/Time 3/7/2012 9:50:00 AM 0 mg/L 1.5 3/12/2012 08:50 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 3/7/2012 9:16:00 AM 1000 mg/L 200 15500 0 

### INORGANIC METALS EPA 200.7 Analyst: MS

Iron, dissolved 3/7/2012 9:09:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 3/7/2012 9:09:00 PM 0.02 mg/L 1 0.10 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 3/7/2012 1:12:56 PM 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: MS

Aluminum 3/7/2012 8:57:00 PM 0.1 mg/L 1 < 0.1 0 Arsenic 3/7/2012 8:57:00 PM 0.02 mg/L 1 < 0.02 0 Beryllium 3/7/2012 8:57:00 PM 0.001 mg/L 1 < 0.001 0.8 Boron 3/8/2012 12:38:00 PM 2.50 mg/L 50 303 0 Cadmium 3/7/2012 8:57:00 PM 0.002 mg/L 1 0.002 0 Chromium 3/7/2012 8:57:00 PM 0.01 mg/L 1 < 0.01 0 Copper 3/7/2012 8:57:00 PM 0.01 mg/L 1 < 0.01 0.1 Iron 3/7/2012 8:57:00 PM 0.05 mg/L 1 < 0.05 0 Lead 3/7/2012 8:57:00 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 3/7/2012 8:57:00 PM 0.01 mg/L 1 16.2 0 Nickel 3/7/2012 8:57:00 PM 0.01 mg/L 1 < 0.01 0 Selenium 3/7/2012 8:57:00 PM 0.02 mg/L 1 0.10 3.4 Silver 3/7/2012 8:57:00 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 3/7/2012 8:57:00 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 3/8/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 3/8/2012 8:50:00 AM 5 mg/L 1 < 5 15 NOTES: S - Spike recovery indicates a possible matrix effect. The method is in control as indicated by the LCS.

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 3/6/2012 10:35:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1203210
Lab ID: G1203210-002

DF 

# Geochemical Testing Date: 13-Mar-12

Received Date: 3/6/2012 7:00:50 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MC
INORGANIC NON-METALS SM 2540 C Analyst: GMG

Total dissolved solids 3/7/2012 10:00:10 AM 200 mg/L 10 31200 0 

### PHYSICAL TESTS SM 2540D Analyst: GMG

Total suspended solids 3/7/2012 11:17:14 AM 100 mg/L 20 11100 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 3/7/2012 9:50:00 AM 2 mg/L 1.5 8 0 Finish Date/Time 3/7/2012 9:50:00 AM 0 mg/L 1.5 3/12/2012 08:50 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 3/7/2012 9:16:00 AM 1000 mg/L 200 17600 0 

### INORGANIC METALS USGS I-1230-85 Analyst: SEM

Hexavalent Chromium 3/6/2012 7:55:00 PM 0.020 mg/L 1 < 0.020 0 

### INORGANIC METALS EPA 200.7 Analyst: MS

Iron, dissolved 3/7/2012 9:15:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 3/7/2012 9:15:00 PM 0.02 mg/L 1 0.17 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 3/7/2012 1:15:07 PM 0.10 mg/L 500 0.38 0 

### INORGANIC METALS EPA 200.7 Analyst: MS

Aluminum 3/7/2012 1:06:00 PM 1.0 mg/L 1 322 0 Arsenic 3/7/2012 1:06:00 PM 0.20 mg/L 1 1.04 0 Beryllium 3/7/2012 1:06:00 PM 0.010 mg/L 1 0.025 0 Boron 3/8/2012 12:09:00 PM 5.00 mg/L 10 427 0 Cadmium 3/7/2012 1:06:00 PM 0.020 mg/L 1 0.058 0 Chromium 3/7/2012 1:06:00 PM 0.10 mg/L 1 1.55 0 Copper 3/7/2012 1:06:00 PM 0.10 mg/L 1 0.87 0 Iron 3/7/2012 1:06:00 PM 0.50 mg/L 1 1030 0 Lead 3/7/2012 1:06:00 PM 0.20 mg/L 1 0.43 0 Manganese 3/7/2012 1:06:00 PM 0.10 mg/L 1 286 0 Nickel 3/7/2012 1:06:00 PM 0.10 mg/L 1 3.55 0 Selenium 3/7/2012 1:06:00 PM 0.20 mg/L 1 2.53 0 Silver 3/7/2012 1:06:00 PM 0.050 mg/L 1 < 0.050 0 Zinc 3/7/2012 1:06:00 PM 0.10 mg/L 1 2.80 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 3/8/2012 0.02 mg/L 1 1.53 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 3/8/2012 8:50:00 AM 24 mg/L 4.76 < 24 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Tuesday, March 20, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 M(b) Order No.: G1203484 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 3/13/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 20-Mar-12 Date: 

# Geochemical Testing
Project: Keystone 611 M(b) CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1203484 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 M(b) Client Sample ID: Outfall 101

Collection Date: 3/13/2012 9:45:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1203484
Lab ID: G1203484-001

DF 

# Geochemical Testing Date: 20-Mar-12

Received Date: 3/13/2012 6:14:52 PM 

# Laboratory Results

Sampled By : Client

MC
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 3/14/2012 10:20:22 A M 5 mg/L 1 < 5 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 3/14/2012 10:20:32 A M 100 mg/L 5 26100 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: SEM

BOD 5-day 3/14/2012 10:35:00 A M 2 mg/L 1.5 < 2 25 Finish Date/Time 3/14/2012 10:35:00 A M 0 mg/L 1.5 3/19/2012 10:50 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: MLS

Chloride 3/14/2012 10:50:00 A M 1000 mg/L 200 15200 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 3/14/2012 11:07:00 P M 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 3/14/2012 11:07:00 P M 0.02 mg/L 1 0.07 0 

### INORGANIC METALS SM 3112B Analyst: MBG

Mercury 3/15/2012 9:38:55 AM 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 3/14/2012 11:21:00 P M 0.1 mg/L 1 6.6 0 Arsenic 3/14/2012 11:21:00 P M 0.02 mg/L 1 < 0.02 0 Beryllium 3/14/2012 11:21:00 P M 0.001 mg/L 1 < 0.001 0.8 Boron 3/16/2012 1:14:00 PM 2.50 mg/L 50 289 0 Cadmium 3/14/2012 11:21:00 P M 0.002 mg/L 1 < 0.002 0 Chromium 3/14/2012 11:21:00 P M 0.01 mg/L 1 < 0.01 0 Copper 3/14/2012 11:21:00 P M 0.01 mg/L 1 < 0.01 0.1 Iron 3/14/2012 11:21:00 P M 0.05 mg/L 1 < 0.05 0 Lead 3/14/2012 11:21:00 P M 0.02 mg/L 1 < 0.02 0.1 Manganese 3/14/2012 11:21:00 P M 0.01 mg/L 1 13.1 0 Nickel 3/14/2012 11:21:00 P M 0.01 mg/L 1 0.01 0 Selenium 3/14/2012 11:21:00 P M 0.02 mg/L 1 0.06 3.4 Silver 3/14/2012 11:21:00 P M 0.005 mg/L 1 < 0.005 0.1 Zinc 3/14/2012 11:21:00 P M 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 3/19/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 3/14/2012 3:48:00 PM 5 mg/L 1 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 M(b) Client Sample ID: FGD Influent

Collection Date: 3/13/2012 9:30:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1203484
Lab ID: G1203484-002

DF 

# Geochemical Testing Date: 20-Mar-12

Received Date: 3/13/2012 6:14:52 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MC
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 3/14/2012 10:20:32 A M 200 mg/L 10 31100 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 3/14/2012 10:20:21 A M 100 mg/L 20 13800 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: SEM

BOD 5-day 3/14/2012 10:35:00 A M 6 mg/L 6 17 0 Finish Date/Time 3/14/2012 10:35:00 A M 0 mg/L 6 3/19/2012 10:50 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: MLS

Chloride 3/14/2012 10:50:00 A M 1000 mg/L 200 15700 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 3/14/2012 11:14:00 P M 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 3/14/2012 11:14:00 P M 0.02 mg/L 1 0.09 0 

### INORGANIC METALS SM 3112B Analyst: MBG

Mercury 3/15/2012 9:47:46 AM 0.10 mg/L 500 0.60 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 3/15/2012 11:34:00 P M 1.0 mg/L 1 360 0 Arsenic 3/15/2012 11:34:00 P M 0.20 mg/L 1 1.41 0 Beryllium 3/16/2012 9:24:00 PM 0.010 mg/L 1 0.040 0 Boron 3/16/2012 3:20:00 PM 5.00 mg/L 10 362 0 Cadmium 3/16/2012 9:24:00 PM 0.020 mg/L 1 0.084 0 Chromium 3/15/2012 11:34:00 P M 0.10 mg/L 1 2.09 0 Copper 3/15/2012 11:34:00 P M 0.10 mg/L 1 1.33 0 Iron 3/15/2012 11:34:00 P M 0.50 mg/L 1 1540 0 Lead 3/15/2012 11:34:00 P M 0.20 mg/L 1 0.54 0 Manganese 3/16/2012 9:24:00 PM 0.10 mg/L 1 233 0 Nickel 3/15/2012 11:34:00 P M 0.10 mg/L 1 3.67 0 Selenium 3/16/2012 9:24:00 PM 0.20 mg/L 1 3.82 0 Silver 3/15/2012 11:34:00 P M 0.050 mg/L 1 < 0.050 0 Zinc 3/15/2012 11:34:00 P M 0.10 mg/L 1 3.67 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 3/19/2012 0.02 mg/L 1 2.09 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 3/14/2012 3:50:00 PM 19 mg/L 3.85 < 19 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Tuesday, March 27, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1203789 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 3/20/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 27-Mar-12 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1203789 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 3/20/2012 9:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1203789
Lab ID: G1203789-001

DF 

# Geochemical Testing Date: 27-Mar-12

Received Date: 3/20/2012 5:52:06 PM 

# Laboratory Results

Sampled By : Client

MC
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 3/21/2012 8:03:38 AM 1 mg/L 1 4 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 3/21/2012 8:06:52 AM 100 mg/L 5 24400 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 3/21/2012 7:30:00 AM 2 mg/L 1.5 < 2 25 Finish Date/Time 3/21/2012 7:30:00 AM 0 mg/L 1.5 3/26/2012 08:30 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 3/22/2012 11:32:00 A M 1000 mg/L 200 14400 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 3/23/2012 1:00:00 AM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 3/23/2012 1:00:00 AM 0.02 mg/L 1 0.08 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 3/22/2012 10:42:36 A M 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 3/23/2012 12:54:00 A M 0.1 mg/L 1 6.7 0 Arsenic 3/23/2012 12:54:00 A M 0.02 mg/L 1 < 0.02 0 Beryllium 3/23/2012 12:54:00 A M 0.001 mg/L 1 < 0.001 0.8 Boron 3/23/2012 2:30:50 PM 2.50 mg/L 50 305 0 Cadmium 3/23/2012 12:54:00 A M 0.002 mg/L 1 0.003 0 Chromium 3/23/2012 12:54:00 A M 0.01 mg/L 1 < 0.01 0 Copper 3/23/2012 12:54:00 A M 0.01 mg/L 1 < 0.01 0.1 Iron 3/23/2012 12:54:00 A M 0.05 mg/L 1 < 0.05 0 Lead 3/23/2012 12:54:00 A M 0.02 mg/L 1 < 0.02 0.1 Manganese 3/23/2012 12:54:00 A M 0.01 mg/L 1 10.9 0 Nickel 3/23/2012 12:54:00 A M 0.01 mg/L 1 < 0.01 0 Selenium 3/23/2012 12:54:00 A M 0.02 mg/L 1 0.07 3.4 Silver 3/23/2012 12:54:00 A M 0.005 mg/L 1 < 0.005 0.1 Zinc 3/23/2012 12:54:00 A M 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 3/26/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 3/22/2012 4:01:00 PM 5 mg/L 1 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 3/20/2012 9:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1203789
Lab ID: G1203789-002

DF 

# Geochemical Testing Date: 27-Mar-12

Received Date: 3/20/2012 5:52:06 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MC
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 3/21/2012 8:06:52 AM 200 mg/L 10 27100 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 3/21/2012 8:03:40 AM 100 mg/L 20 15300 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 3/21/2012 7:30:00 AM 6 mg/L 6 15 0 Finish Date/Time 3/21/2012 7:30:00 AM 0 mg/L 6 3/26/2012 08:30 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 3/22/2012 11:32:00 A M 1000 mg/L 200 14900 0 

### INORGANIC METALS USGS I-1230-85 Analyst: SEM

Hexavalent Chromium 3/20/2012 7:10:00 PM 0.020 mg/L 1 < 0.020 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 3/23/2012 1:06:00 AM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 3/23/2012 1:06:00 AM 0.02 mg/L 1 0.08 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 3/22/2012 10:44:45 A M 0.10 mg/L 500 0.66 0 

### INORGANIC METALS EPA 200.7 Analyst: JAS

Aluminum 3/22/2012 3:19:00 PM 1.0 mg/L 1 268 0 Arsenic 3/22/2012 3:19:00 PM 0.20 mg/L 1 1.49 0 Beryllium 3/23/2012 3:05:28 PM 0.010 mg/L 1 0.032 0 Boron 3/23/2012 1:52:10 PM 5.00 mg/L 10 346 0 Cadmium 3/22/2012 3:19:00 PM 0.020 mg/L 1 0.146 0 Chromium 3/22/2012 3:19:00 PM 0.10 mg/L 1 1.57 0 Copper 3/22/2012 3:19:00 PM 0.10 mg/L 1 1.45 0 Iron 3/22/2012 3:19:00 PM 0.50 mg/L 1 1370 0 Lead 3/22/2012 3:19:00 PM 0.20 mg/L 1 0.70 0 Manganese 3/23/2012 1:52:10 PM 1.00 mg/L 10 296 0 Nickel 3/22/2012 3:19:00 PM 0.10 mg/L 1 3.65 0 Selenium 3/22/2012 3:19:00 PM 0.20 mg/L 1 3.40 0 Silver 3/22/2012 3:19:00 PM 0.050 mg/L 1 < 0.050 0 Zinc 3/22/2012 3:19:00 PM 0.10 mg/L 1 3.59 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 3/26/2012 0.02 mg/L 1 1.57 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 3/22/2012 4:02:00 PM 19 mg/L 3.85 < 19 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Wednesday, April 04, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1203A70 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 3/27/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 04-Apr-12 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1203A70 

# CASE NARRATIVE

Samples were not filtered in the field for dissolved metals; samples were lab filtered. No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 3/27/2012 10:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1203A70
Lab ID: G1203A70-001

DF 

# Geochemical Testing Date: 04-Apr-12

Received Date: 3/27/2012 6:02:46 PM 

# Laboratory Results

Sampled By : Client

MC
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 3/28/2012 10:32:02 A M 1 mg/L 1 3 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 3/28/2012 11:31:18 A M 20 mg/L 1 29900 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 3/28/2012 10:30:00 A M 2 mg/L 1.5 < 2 25 Finish Date/Time 3/28/2012 10:30:00 A M 0 mg/L 1.5 4/2/2012 10:10 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 3/28/2012 11:11:00 A M 1000 mg/L 200 15100 0 

### INORGANIC METALS EPA 200.7 Analyst: JAS

Iron, dissolved 3/29/2012 3:31:17 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 3/29/2012 3:31:17 PM 0.02 mg/L 1 0.11 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 4/2/2012 11:33:11 AM 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 3/30/2012 11:40:00 P M 0.1 mg/L 1 6.8 0 Arsenic 3/30/2012 11:40:00 P M 0.02 mg/L 1 < 0.02 0 Beryllium 3/30/2012 11:40:00 P M 0.001 mg/L 1 < 0.001 0.8 Boron 4/2/2012 2:00:00 PM 2.50 mg/L 50 324 0 Cadmium 3/30/2012 11:40:00 P M 0.002 mg/L 1 0.002 0 Chromium 3/30/2012 11:40:00 P M 0.01 mg/L 1 < 0.01 0 Copper 3/30/2012 11:40:00 P M 0.01 mg/L 1 < 0.01 0.1 Iron 3/30/2012 11:40:00 P M 0.05 mg/L 1 < 0.05 0 Lead 3/30/2012 11:40:00 P M 0.02 mg/L 1 < 0.02 0.1 Manganese 3/30/2012 11:40:00 P M 0.01 mg/L 1 16.7 0 Nickel 3/30/2012 11:40:00 P M 0.01 mg/L 1 < 0.01 0 Selenium 3/30/2012 11:40:00 P M 0.02 mg/L 1 0.09 3.4 Silver 3/30/2012 11:40:00 P M 0.005 mg/L 1 < 0.005 0.1 Zinc 3/30/2012 11:40:00 P M 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 4/3/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 3/29/2012 4:20:00 PM 5 mg/L 1.02 < 5 15 NOTES: S - Spike recovery indicates a possible matrix effect. The method is in control as indicated by the LCS.

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 3/27/2012 9:45:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1203A70
Lab ID: G1203A70-002

DF 

# Geochemical Testing Date: 04-Apr-12

Received Date: 3/27/2012 6:02:46 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MC
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 3/28/2012 11:31:20 A M 200 mg/L 10 38900 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 3/28/2012 10:31:59 A M 100 mg/L 20 19800 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 3/28/2012 10:30:00 A M 6 mg/L 6 30 0 Finish Date/Time 3/28/2012 10:30:00 A M 0 mg/L 6 4/2/2012 10:10 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 3/28/2012 11:11:00 A M 1000 mg/L 200 16800 0 

### INORGANIC METALS USGS I-1230-85 Analyst: MLR

Hexavalent Chromium 3/27/2012 6:45:00 PM 0.020 mg/L 1 < 0.020 0 

### INORGANIC METALS EPA 200.7 Analyst: JAS

Iron, dissolved 3/29/2012 3:33:52 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 3/29/2012 3:33:52 PM 0.02 mg/L 1 0.13 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 4/2/2012 11:35:26 AM 0.10 mg/L 500 0.49 0 

### INORGANIC METALS EPA 200.7 Analyst: MS

Aluminum 3/29/2012 10:36:00 A M 1.0 mg/L 1 319 0 Arsenic 3/29/2012 10:36:00 A M 0.20 mg/L 1 1.72 0 Beryllium 3/29/2012 4:37:10 PM 0.010 mg/L 1 0.042 0 Boron 3/29/2012 4:34:00 PM 5.00 mg/L 10 376 0 Cadmium 3/29/2012 10:36:00 A M 0.020 mg/L 1 0.169 0 Chromium 3/29/2012 10:36:00 A M 0.10 mg/L 1 2.07 0 Copper 3/29/2012 10:36:00 A M 0.10 mg/L 1 1.49 0 Iron 3/29/2012 4:37:10 PM 0.50 mg/L 1 1750 0 Lead 3/29/2012 10:36:00 A M 0.20 mg/L 1 0.59 0 Manganese 3/29/2012 4:37:10 PM 0.10 mg/L 1 100 0 Nickel 3/29/2012 10:36:00 A M 0.10 mg/L 1 4.91 0 Selenium 3/29/2012 4:37:10 PM 0.20 mg/L 1 3.99 0 Silver 3/29/2012 10:36:00 A M 0.050 mg/L 1 < 0.050 0 Zinc 3/29/2012 10:36:00 A M 0.10 mg/L 1 4.43 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 4/2/2012 0.02 mg/L 1 2.07 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 3/29/2012 4:21:00 PM 19 mg/L 3.85 < 19 0 NOTES: The pH of the sample was >2.

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Monday, April 16, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 Q(a) Order No.: G1204091 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 4/3/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 16-Apr-12 Date: 

# Geochemical Testing
Project: Keystone 611 Q(a) CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1204091 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 Q(a) Client Sample ID: Outfall 101

Collection Date: 4/3/2012 11:10:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1204091
Lab ID: G1204091-001

DF 

# Geochemical Testing Date: 16-Apr-12

Received Date: 4/3/2012 6:59:54 PM 

# Laboratory Results

Sampled By : Client

MC
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 4/4/2012 2:18:29 PM 1 mg/L 1 < 1 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 4/4/2012 2:19:03 PM 100 mg/L 5 25000 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 4/4/2012 9:15:00 AM 2 mg/L 1.5 < 2 0 Finish Date/Time 4/4/2012 9:15:00 AM 0 mg/L 1.5 4/9/2012 08:15 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 4/4/2012 1:59:00 PM 1000 mg/L 200 14000 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 4/10/2012 12:54:00 A M 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 4/6/2012 6:07:40 PM 0.02 mg/L 1 0.11 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 4/5/2012 12:56:47 PM 0.0002 mg/L 1 < 0.0002 0 

### INORGANIC METALS EPA 200.7 Analyst: JAS

Aluminum 4/5/2012 5:14:16 PM 0.1 mg/L 1 < 0.1 0 Arsenic 4/5/2012 5:14:16 PM 0.02 mg/L 1 < 0.02 0 Beryllium 4/5/2012 5:14:16 PM 0.001 mg/L 1 < 0.001 0.8 Boron 4/6/2012 1:17:00 PM 2.50 mg/L 50 257 0 Cadmium 4/5/2012 5:14:16 PM 0.002 mg/L 1 < 0.002 0 Chromium 4/5/2012 5:14:16 PM 0.01 mg/L 1 < 0.01 0 Copper 4/5/2012 5:14:16 PM 0.01 mg/L 1 < 0.01 0.1 Iron 4/5/2012 5:14:16 PM 0.05 mg/L 1 < 0.05 0 Lead 4/5/2012 5:14:16 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 4/6/2012 1:53:00 PM 0.10 mg/L 10 19.1 0 Nickel 4/5/2012 5:14:16 PM 0.01 mg/L 1 < 0.01 0 Selenium 4/5/2012 5:14:16 PM 0.02 mg/L 1 0.12 3.4 Silver 4/5/2012 5:14:16 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 4/5/2012 5:14:16 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 4/9/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: AMS

Oil & Grease 4/5/2012 1:06:00 PM 5 mg/L 1.02 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 Q(a) Client Sample ID: FGD Influent

Collection Date: 4/3/2012 11:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1204091
Lab ID: G1204091-002

DF 

# Geochemical Testing Date: 16-Apr-12

Received Date: 4/3/2012 6:59:54 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MC
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 4/4/2012 2:19:03 PM 200 mg/L 10 23800 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 4/4/2012 2:18:09 PM 100 mg/L 20 5780 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 4/4/2012 9:15:00 AM 3 mg/L 3 19 0 Finish Date/Time 4/4/2012 9:15:00 AM 0 mg/L 3 4/9/2012 08:15 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 4/4/2012 1:59:00 PM 1000 mg/L 200 12700 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 4/10/2012 1:02:00 AM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 4/6/2012 6:10:23 PM 0.02 mg/L 1 0.31 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 4/5/2012 12:59:01 PM 0.10 mg/L 500 0.16 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 4/10/2012 6:00:00 AM 1.0 mg/L 1 77.7 0 Arsenic 4/10/2012 6:00:00 AM 0.20 mg/L 1 0.33 0 Beryllium 4/10/2012 6:00:00 AM 0.010 mg/L 1 < 0.010 0 Boron 4/10/2012 5:33:38 PM 5.00 mg/L 10 217 0 Cadmium 4/10/2012 6:00:00 AM 0.020 mg/L 1 0.037 0 Chromium 4/10/2012 6:00:00 AM 0.10 mg/L 1 0.44 0 Copper 4/10/2012 6:00:00 AM 0.10 mg/L 1 0.32 0 Iron 4/10/2012 6:00:00 AM 0.50 mg/L 1 397 0 Lead 4/10/2012 6:00:00 AM 0.20 mg/L 1 < 0.20 0 Manganese 4/10/2012 6:00:00 AM 0.10 mg/L 1 190 0 Nickel 4/10/2012 6:00:00 AM 0.10 mg/L 1 1.88 0 Selenium 4/10/2012 6:00:00 AM 0.20 mg/L 1 1.25 0 Silver 4/10/2012 6:00:00 AM 0.050 mg/L 1 < 0.050 0 Zinc 4/10/2012 6:47:33 PM 0.10 mg/L 1 1.04 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 4/12/2012 0.02 mg/L 1 0.41 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: AMS

Oil & Grease 4/5/2012 1:06:00 PM 19 mg/L 3.7 < 19 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

## No problems were encountered during analysis of this workorder, except if noted in this report.

Samples were not filtered in the field for dissolved metals; samples were lab filtered. 2005 N. Center Ave. Somerset PA 15501 814-443-1671 814-445-6666 FAX:814-445-6729 

### Client: GenOn ENERGY INC. - KEYSTONE STATION 

# CASE NARRATIVE Project: Permit Renewal Lab Order: G1204401

Legend: ND - Not Detected at the Quantitation Limit S - Spike Recovery outside accepted recovery limits J - Indicates an estimated value R - RPD outside accepted recovery limits U - The analyte was not detected at or above the listed E - Value above quantitation range concentration, which is below the laboratory quantitation limit ** - Value exceeds Action Limit B - Analyte detected in the associated Method Blank H - Method Hold Time Exceeded Q - Qualifier QL - Quantitation Limit DF - Dilution Factor MCL - Contaminant Limit 

## Page 1 of 7

### Inorganic Non-Metals SM 2540 C Analyst: KLS

Total dissolved solids 30600 100 mg/L 5 04/11/2012 09:50 Physical Tests SM 2540D Analyst: KLS Total suspended solids 9 5 mg/L 1 04/11/2012 09:49 Indicator Organic Parameters SM 5210 B Analyst: MMR BOD 5-day 0.75 2 U mg/L 1.5 04/11/2012 10:45 Finish Date/Time 4/16/2012 10:10 0 mg/L 1.5 04/11/2012 10:45
Inorganic Non Metals SM 4500-CNI Analyst: MLR Cyanide, free 5.00 10 U μg/L 1 04/12/2012 13:41 Inorganic Non Metals SM 4500-CN-C&E Analyst: MLR Cyanide, total 5.0 10 U μg/L 1 04/11/2012 13:47 Indicator Organic Parameters HACH 8000 Analyst: SEM Chemical Oxygen Demand 1100 20 mg/L 2 04/13/2012 17:30 Physical Tests SM 2120C Analyst: MLS Color 12 10 Color Units 1 04/10/2012 19:35 Inorganic Non Metals USGS I-1230-85 Analyst: SAG Hexavalent Chromium 27 20 μg/L 1 04/10/2012 19:45 Inorganic Non-Metals EPA 300.0 Analyst: CAS Bromide 178 5.0 mg/L 25 04/16/2012 19:22 Fluoride 3.6 1.0 mg/L 10 04/12/2012 22:36 Sulfate 1150 20 mg/L 10 04/12/2012 22:36 Inorganic Non-Metals SM 5540C Analyst: SEM MBAS 2.8 0.50 mg/L as 10 04/11/2012 10:40



# Laboratory Results

2005 N. Center Ave. Somerset PA 15501 814-443-1671 814-445-6666 FAX:814-445-6729 

### Client: GenOn ENERGY INC. - KEYSTONE STATION Client Sample ID: 101 Eff Lab Order: G1204401 Day 1 Project: Permit Renewal Sampled By: Client Lab ID: G1204401-001 Collection Date: 04/10/2012 11:00 Matrix: Aqueous Received Date: 04/10/2012 18:24 Analyses Result QL Q Units DF Date Analyzed



## Page 2 of 7

### LAS Inorganic Non-Metals EPA 350.1 Analyst: SLY Ammonia Nitrogen - Distilled 5.22 0.50 mg/L as N 5 04/12/2012 14:22 Inorganic Non-Metals EPA 353.2 Analyst: SLY Nitrate - Nitrite 26.6 0.50 mg/L as N 10 04/16/2012 11:35 Inorganic Non-Metals SM 4500-P B.5 E Analyst: SEM Phosphorus, total 0.9 1.0 J mg/L as P 10 04/12/2012 14:49 Indicator Organic Parameters EPA 420.1 Analyst: MLR Phenolics 10.0 20.0 U μg/L 1 04/12/2012 11:25 Inorganic Non Metals SM 4500 S D Analyst: KMW Sulfide 0.050 0.1 U mg/L 1 04/12/2012 15:30 Inorganic Non Metals SM 4500-SO3 B Analyst: MLS Lab Sulfite 2.0 2.0 U mg/L 1 04/10/2012 19:22 Inorganic Non-Metals EPA 351.2 Analyst: SLY Total Kjeldahl Nitrogen 19.7 1.0 mg/L as N 1 04/12/2012 09:58 Inorganic Metals SM 3112B Analyst: JEK Mercury 0.10 0.20 U μg/L 1 04/12/2012 11:07 Trivalent Chromium ug/L EPA 200.7/I-1230-85 Analyst: LAN Trivalent Chromium 10.0 20.0 U μg/L 1 04/27/2012 00:00 Inorganic Metals EPA 200.7 Analyst: MBG Iron, dissolved 10.0 50 U μg/L 1 04/12/2012 23:08 Inorganic Metals EPA 200.7 Analyst: GMG Aluminum 50.0 100 U μg/L 1 05/18/2012 00:15 Antimony 10.0 20.0 U μg/L 1 05/18/2012 00:15



# Laboratory Results

2005 N. Center Ave. Somerset PA 15501 814-443-1671 814-445-6666 FAX:814-445-6729 

### Client: GenOn ENERGY INC. - KEYSTONE STATION Client Sample ID: 101 Eff Lab Order: G1204401 Day 1 Project: Permit Renewal Sampled By: Client Lab ID: G1204401-001 Collection Date: 04/10/2012 11:00 Matrix: Aqueous Received Date: 04/10/2012 18:24 Analyses Result QL Q Units DF Date Analyzed



## Page 3 of 7

### Arsenic 10.0 20.0 U μg/L 1 05/18/2012 00:15

Barium 191 10.0 μg/L 1 05/18/2012 00:15 Beryllium 0.500 1.00 U μg/L 1 05/18/2012 00:15 Boron 220000 2500 μg/L 50 04/17/2012 12:29 Cadmium 1.9 2.00 J μg/L 1 05/18/2012 00:15 Calcium 5340000 5000 μg/L 50 04/17/2012 12:29 Chromium 5.00 10.0 U μg/L 1 05/18/2012 00:15 Cobalt 2.00 5.00 U μg/L 1 05/18/2012 00:15 Copper 5.00 10.0 U μg/L 1 05/18/2012 00:15 Iron 39 50.0 J μg/L 1 05/18/2012 00:15 Lead 30.0 20.0 μg/L 1 05/18/2012 00:15 Magnesium 1850000 5000 μg/L 50 04/17/2012 12:29 Manganese 19000 10.0 μg/L 1 05/18/2012 00:15 Molybdenum 29.9 20.0 μg/L 1 05/18/2012 00:15 Nickel 17.5 10.0 μg/L 1 05/18/2012 00:15 Selenium 106 20.0 μg/L 1 05/18/2012 00:15 Silver 2.00 5.00 U μg/L 1 05/18/2012 00:15 Thallium 16 20.0 J μg/L 1 05/18/2012 00:15 Tin 50.0 100 U μg/L 1 05/18/2012 00:15 Titanium 10.2 5.00 μg/L 1 05/18/2012 00:15 Zinc 7.5 10.0 J μg/L 1 05/18/2012 00:15 Hardness (SM 2340B) 20900000 50000 μg/L 50 04/17/2012 12:29 Semi-Volatile Compounds EPA 625 Analyst: NPT 1,2,4-Trichlorobenzene 4.8 9.5 U μg/L 0.95 04/19/2012 02:26 1,2-Dichlorobenzene 4.8 9.5 U μg/L 0.95 04/19/2012 02:26 1,3-Dichlorobenzene 4.8 9.5 U μg/L 0.95 04/19/2012 02:26 1,4-Dichlorobenzene 4.8 9.5 U μg/L 0.95 04/19/2012 02:26 2,4,6-Trichlorophenol 4.8 9.5 U μg/L 0.95 04/19/2012 02:26 2,4-Dichlorophenol 4.8 9.5 U μg/L 0.95 04/19/2012 02:26 2,4-Dimethylphenol 4.8 9.5 U μg/L 0.95 04/19/2012 02:26 2,4-Dinitrophenol 4.8 48 U μg/L 0.95 04/19/2012 02:26 2,4-Dinitrotoluene 4.8 9.5 U μg/L 0.95 04/19/2012 02:26 2,6-Dinitrotoluene 4.8 9.5 U μg/L 0.95 04/19/2012 02:26 2-Chloro-Naphthalene 4.8 9.5 U μg/L 0.95 04/19/2012 02:26



# Laboratory Results

2005 N. Center Ave. Somerset PA 15501 814-443-1671 814-445-6666 FAX:814-445-6729 

### Client: GenOn ENERGY INC. - KEYSTONE STATION Client Sample ID: 101 Eff Lab Order: G1204401 Day 1 Project: Permit Renewal Sampled By: Client Lab ID: G1204401-001 Collection Date: 04/10/2012 11:00 Matrix: Aqueous Received Date: 04/10/2012 18:24 Analyses Result QL Q Units DF Date Analyzed



## Page 4 of 7

### 2-Chlorophenol 4.8 9.5 U μg/L 0.95 04/19/2012 02:26

2-Methyl-4,6-dinitrophenol 4.8 48 U μg/L 0.95 04/19/2012 02:26 2-Nitrophenol 4.8 9.5 U μg/L 0.95 04/19/2012 02:26 3,3-Dichlorobenzidine 4.8 48 U μg/L 0.95 04/19/2012 02:26 4-Bromophenylphenylether 4.8 9.5 U μg/L 0.95 04/19/2012 02:26 4-Chloro-3-methylphenol 4.8 9.5 U μg/L 0.95 04/19/2012 02:26 4-Chlorophenylphenylether 4.8 9.5 U μg/L 0.95 04/19/2012 02:26 4-Nitrophenol 4.8 48 U μg/L 0.95 04/19/2012 02:26 Acenaphthene 4.8 9.5 U μg/L 0.95 04/19/2012 02:26 Acenaphthylene 4.8 9.5 U μg/L 0.95 04/19/2012 02:26 Anthracene 4.8 9.5 U μg/L 0.95 04/19/2012 02:26 Azobenzene 4.8 9.5 U μg/L 0.95 04/19/2012 02:26 Benzidine 4.8 9.5 U μg/L 0.95 04/19/2012 02:26 Benzo(a)anthracene 4.8 9.5 U μg/L 0.95 04/19/2012 02:26 Benzo(a)pyrene 4.8 9.5 U μg/L 0.95 04/19/2012 02:26 Benzo(b)fluoranthene 4.8 9.5 U μg/L 0.95 04/19/2012 02:26 Benzo(g,h,i)perylene 4.8 9.5 U μg/L 0.95 04/19/2012 02:26 Benzo(k)fluoranthene 4.8 9.5 U μg/L 0.95 04/19/2012 02:26 bis(2-Chloroethoxy)methane 4.8 9.5 U μg/L 0.95 04/19/2012 02:26 bis(2-Chloroethyl)ether 4.8 9.5 U μg/L 0.95 04/19/2012 02:26 bis(2-Chloroisopropyl)ether 4.8 9.5 U μg/L 0.95 04/19/2012 02:26 bis(2-Ethylhexyl)phthalate 4.8 4.8 μg/L 0.95 04/19/2012 02:26 Butyl benzylphthalate 4.8 9.5 U μg/L 0.95 04/19/2012 02:26 Chrysene 4.8 9.5 U μg/L 0.95 04/19/2012 02:26 Di-N-Butyl Phthalate 4.8 9.5 U μg/L 0.95 04/19/2012 02:26 Di-N-Octylphthalate 4.8 9.5 U μg/L 0.95 04/19/2012 02:26 Di-n-propylnitrosamine 4.8 9.5 U μg/L 0.95 04/19/2012 02:26 Dibenzo(a,h)anthracene 4.8 9.5 U μg/L 0.95 04/19/2012 02:26 Diethyl Phthalate 4.8 9.5 U μg/L 0.95 04/19/2012 02:26 Dimethyl Phthalate 4.8 9.5 U μg/L 0.95 04/19/2012 02:26 Fluoranthene 4.8 9.5 U μg/L 0.95 04/19/2012 02:26 Fluorene 4.8 9.5 U μg/L 0.95 04/19/2012 02:26 Hexachlorobenzene 4.8 9.5 U μg/L 0.95 04/19/2012 02:26 Hexachlorobutadiene 4.8 9.5 U μg/L 0.95 04/19/2012 02:26 Hexachlorocyclopentadiene 4.8 48 U μg/L 0.95 04/19/2012 02:26



# Laboratory Results

2005 N. Center Ave. Somerset PA 15501 814-443-1671 814-445-6666 FAX:814-445-6729 

### Client: GenOn ENERGY INC. - KEYSTONE STATION Client Sample ID: 101 Eff Lab Order: G1204401 Day 1 Project: Permit Renewal Sampled By: Client Lab ID: G1204401-001 Collection Date: 04/10/2012 11:00 Matrix: Aqueous Received Date: 04/10/2012 18:24 Analyses Result QL Q Units DF Date Analyzed



## Page 5 of 7

### Hexachloroethane 4.8 9.5 U μg/L 0.95 04/19/2012 02:26

Indeno(1,2,3-cd)pyrene 4.8 9.5 U μg/L 0.95 04/19/2012 02:26 Isophorone 1.9 4.8 U μg/L 0.95 04/19/2012 02:26 n-Nitrosodimethylamine 4.8 9.5 U μg/L 0.95 04/19/2012 02:26 n-Nitrosodiphenylamine 9.5 19 U μg/L 0.95 04/19/2012 02:26 Naphthalene 4.8 9.5 U μg/L 0.95 04/19/2012 02:26 Nitrobenzene 4.8 9.5 U μg/L 0.95 04/19/2012 02:26 Pentachlorophenol 4.8 48 U μg/L 0.95 04/19/2012 02:26 Phenanthrene 4.8 9.5 U μg/L 0.95 04/19/2012 02:26 Phenol 4.8 9.5 U μg/L 0.95 04/19/2012 02:26 Pyrene 4.8 9.5 U μg/L 0.95 04/19/2012 02:26 TIC: 1-Butene, 3,3-dimethyl- NA 3.8 U μg/L 0.95 04/19/2012 02:26 TIC: Chloroiodomethane NA 3.8 U μg/L 0.95 04/19/2012 02:26 TIC: Cyclohexanone, 2-hydroxy- NA 3.8 U μg/L 0.95 04/19/2012 02:26 TIC: Hydrazine, 1,1-dipropyl- NA 3.8 U μg/L 0.95 04/19/2012 02:26 TIC: Methane, bromodichloro- NA 3.8 U μg/L 0.95 04/19/2012 02:26 Volatile Organic Compounds EPA 624 Analyst: SJM 1,1,1-Trichloroethane 0.200 0.5 U μg/L 1 04/11/2012 15:20 1,1,2,2-Tetrachloroethane 0.200 0.5 U μg/L 1 04/11/2012 15:20 1,1,2-Trichloroethane 0.500 1.0 U μg/L 1 04/11/2012 15:20 1,1-Dichloroethane 0.200 0.5 U μg/L 1 04/11/2012 15:20 1,1-Dichloroethene 0.200 0.5 U μg/L 1 04/11/2012 15:20 1,2-Dichloroethane 0.200 0.5 U μg/L 1 04/11/2012 15:20 1,2-Dichloropropane 0.200 0.5 U μg/L 1 04/11/2012 15:20 2-Chloroethylvinyl ether 0.500 1.0 U μg/L 1 04/11/2012 15:20 Benzene 0.200 0.5 U μg/L 1 04/11/2012 15:20 Bromoform 0.200 0.5 U μg/L 1 04/11/2012 15:20 Bromomethane 0.500 1.0 U μg/L 1 04/11/2012 15:20 Carbon Tetrachloride 0.200 0.5 U μg/L 1 04/11/2012 15:20 Chlorobenzene 0.200 0.5 U μg/L 1 04/11/2012 15:20 Chlorodibromomethane 0.400 1.0 U μg/L 1 04/11/2012 15:20 Chloroethane 0.200 0.5 U μg/L 1 04/11/2012 15:20 Chloroform 0.3 0.5 J μg/L 1 04/11/2012 15:20 Chloromethane 0.200 0.5 U μg/L 1 04/11/2012 15:20



# Laboratory Results

2005 N. Center Ave. Somerset PA 15501 814-443-1671 814-445-6666 FAX:814-445-6729 

### Client: GenOn ENERGY INC. - KEYSTONE STATION Client Sample ID: 101 Eff Lab Order: G1204401 Day 1 Project: Permit Renewal Sampled By: Client Lab ID: G1204401-001 Collection Date: 04/10/2012 11:00 Matrix: Aqueous Received Date: 04/10/2012 18:24 Analyses Result QL Q Units DF Date Analyzed



## Page 6 of 7

### Dichlorobromomethane 0.200 0.5 U μg/L 1 04/11/2012 15:20

Ethylbenzene 0.200 0.5 U μg/L 1 04/11/2012 15:20 Methylene Chloride 0.200 0.5 U μg/L 1 04/11/2012 15:20 Tetrachloroethene 0.200 0.5 U μg/L 1 04/11/2012 15:20 Toluene 0.200 0.5 U μg/L 1 04/11/2012 15:20 trans-1,2-Dichloroethene 0.500 1.0 U μg/L 1 04/11/2012 15:20 Trichloroethene 0.200 0.5 U μg/L 1 04/11/2012 15:20 Vinyl Chloride 0.200 0.5 U μg/L 1 04/11/2012 15:20 1,3-Dichloropropylene 0.200 0.5 U μg/L 1 04/11/2012 15:20 TIC: None detected NA 3.0 U 1 04/11/2012 15:20 Volatile Organic Compounds EPA 624 Analyst: SJM Acrolein 2.00 5.00 U μg/L 1 04/11/2012 15:20 Acrylonitrile 0.500 1.00 U μg/L 1 04/11/2012 15:20 Indicator Organic Parameters EPA 1664 Analyst: AMS Oil & Grease 2.04 5 U mg/L 1.02 04/16/2012 08:55 Indicator Organic Parameters SM 20 5310-C Analyst: ACG Total Organic Carbon 1.8 0.5 mg/L 1 04/12/2012 20:13



# Laboratory Results

2005 N. Center Ave. Somerset PA 15501 814-443-1671 814-445-6666 FAX:814-445-6729 

### Client: GenOn ENERGY INC. - KEYSTONE STATION Client Sample ID: 101 Eff Lab Order: G1204401 Day 1 Project: Permit Renewal Sampled By: Client Lab ID: G1204401-001 Collection Date: 04/10/2012 11:00 Matrix: Aqueous Received Date: 04/10/2012 18:24 Analyses Result QL Q Units DF Date Analyzed



## Page 7 of 7

# Wednesday, April 18, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 Q(b) Order No.: G1204416 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 4/10/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 18-Apr-12 Date: 

# Geochemical Testing
Project: Keystone 611 Q(b) CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1204416 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 Q(b) Client Sample ID: Outfall 101

Collection Date: 4/10/2012 10:20:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1204416
Lab ID: G1204416-001

DF 

# Geochemical Testing Date: 18-Apr-12

Received Date: 4/10/2012 8:17:02 PM 

# Laboratory Results

Sampled By : Client

MC
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 4/11/2012 9:50:02 AM 5 mg/L 1 < 5 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 4/11/2012 9:50:19 AM 100 mg/L 5 30500 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 4/11/2012 11:35:00 A M 2 mg/L 1.5 < 2 25 Finish Date/Time 4/11/2012 11:35:00 A M 0 mg/L 1.5 4/16/2012 11:10 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: MLS

Chloride 4/11/2012 4:36:00 PM 1000 mg/L 200 14600 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 4/14/2012 10:22:00 A M 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 4/14/2012 10:22:00 A M 0.02 mg/L 1 0.39 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 4/12/2012 11:20:58 A M 0.0002 mg/L 1 < 0.0002 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 4/12/2012 11:36:04 P M 0.1 mg/L 1 < 0.1 0 Arsenic 4/12/2012 11:36:04 P M 0.02 mg/L 1 < 0.02 0 Beryllium 4/12/2012 11:36:04 P M 0.001 mg/L 1 < 0.001 0.8 Boron 4/13/2012 5:13:00 PM 2.50 mg/L 50 235 0 Cadmium 4/12/2012 11:36:04 P M 0.002 mg/L 1 0.003 0 Chromium 4/12/2012 11:36:04 P M 0.01 mg/L 1 < 0.01 0 Copper 4/12/2012 11:36:04 P M 0.01 mg/L 1 < 0.01 0.1 Iron 4/12/2012 11:36:04 P M 0.05 mg/L 1 < 0.05 0 Lead 4/12/2012 11:36:04 P M 0.02 mg/L 1 < 0.02 0.1 Manganese 4/13/2012 6:21:00 PM 0.10 mg/L 10 20.5 0 Nickel 4/12/2012 11:36:04 P M 0.01 mg/L 1 0.01 0 Selenium 4/12/2012 11:36:04 P M 0.02 mg/L 1 0.12 3.4 Silver 4/14/2012 3:17:00 AM 0.005 mg/L 1 < 0.005 0 Zinc 4/12/2012 11:36:04 P M 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 4/17/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: AMS

Oil & Grease 4/16/2012 8:42:00 AM 5 mg/L 0.99 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 Q(b) Client Sample ID: FGD Influent

Collection Date: 4/10/2012 10:10:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1204416
Lab ID: G1204416-002

DF 

# Geochemical Testing Date: 18-Apr-12

Received Date: 4/10/2012 8:17:02 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MC
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 4/11/2012 9:50:19 AM 200 mg/L 10 39900 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 4/11/2012 9:49:48 AM 100 mg/L 20 15200 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 4/11/2012 11:35:00 A M 3 mg/L 3 15 0 Finish Date/Time 4/11/2012 11:35:00 A M 0 mg/L 3 4/16/2012 11:10 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: MLS

Chloride 4/11/2012 4:36:00 PM 1000 mg/L 200 13400 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 4/14/2012 10:38:00 A M 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 4/14/2012 10:38:00 A M 0.02 mg/L 1 0.10 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 4/12/2012 12:42:36 P M 0.0002 mg/L 1 0.0013 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 4/14/2012 7:52:00 PM 1.0 mg/L 1 277 0 Arsenic 4/14/2012 7:52:00 PM 0.20 mg/L 1 1.56 0 Beryllium 4/14/2012 7:52:00 PM 0.010 mg/L 1 0.044 0 Boron 4/16/2012 3:46:00 PM 5.00 mg/L 10 323 0 Cadmium 4/14/2012 7:52:00 PM 0.020 mg/L 1 < 0.020 0 Chromium 4/14/2012 7:52:00 PM 0.10 mg/L 1 1.90 0 Copper 4/14/2012 7:52:00 PM 0.10 mg/L 1 1.62 0 Iron 4/14/2012 7:52:00 PM 0.50 mg/L 1 1730 0 Lead 4/14/2012 7:52:00 PM 0.20 mg/L 1 0.61 0 Manganese 4/14/2012 7:52:00 PM 0.10 mg/L 1 297 0 Nickel 4/14/2012 7:52:00 PM 0.10 mg/L 1 4.65 0 Selenium 4/14/2012 7:52:00 PM 0.20 mg/L 1 3.52 0 Silver 4/14/2012 7:52:00 PM 0.050 mg/L 1 < 0.050 0 Zinc 4/14/2012 7:52:00 PM 0.10 mg/L 1 3.98 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 4/17/2012 0.02 mg/L 1 1.90 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: AMS

Oil & Grease 4/16/2012 8:59:00 AM 19 mg/L 3.7 < 19 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

## No problems were encountered during analysis of this workorder, except if noted in this report.

Samples were not filtered in the field for dissolved metals; samples were lab filtered. 2005 N. Center Ave. Somerset PA 15501 814-443-1671 814-445-6666 FAX:814-445-6729 

### Client: GenOn ENERGY INC. - KEYSTONE STATION 

# CASE NARRATIVE Project: Permit Renewal Lab Order: G1204522

Legend: ND - Not Detected at the Quantitation Limit S - Spike Recovery outside accepted recovery limits J - Indicates an estimated value R - RPD outside accepted recovery limits U - The analyte was not detected at or above the listed E - Value above quantitation range concentration, which is below the laboratory quantitation limit ** - Value exceeds Action Limit B - Analyte detected in the associated Method Blank H - Method Hold Time Exceeded Q - Qualifier QL - Quantitation Limit DF - Dilution Factor MCL - Contaminant Limit 

## Page 1 of 7

### Inorganic Non-Metals SM 2540 C Analyst: KLS

Total dissolved solids 29300 200 mg/L 10 04/12/2012 08:42 Physical Tests SM 2540D Analyst: KLS Total suspended solids 2 1 mg/L 1 04/19/2012 12:02 Indicator Organic Parameters SM 5210 B Analyst: MMR BOD 5-day 0.75 2 U mg/L 1.5 04/12/2012 08:55 Finish Date/Time 4/17/2012 07:55 0 mg/L 1.5 04/12/2012 08:55
Inorganic Non Metals SM 4500-CNI Analyst: MLR Cyanide, free 5.00 10 U μg/L 1 04/12/2012 13:41 Inorganic Non Metals SM 4500-CN-C&E Analyst: MLR Cyanide, total 5.0 10 U μg/L 1 04/17/2012 14:49 Indicator Organic Parameters HACH 8000 Analyst: SEM Chemical Oxygen Demand 1800 20 mg/L 2 04/13/2012 17:30 Physical Tests SM 2120C Analyst: MLS Color 10 10 U Color Units 1 04/11/2012 18:42 Inorganic Non Metals USGS I-1230-85 Analyst: MLS Hexavalent Chromium 15 20 J μg/L 1 04/11/2012 19:00 Inorganic Non-Metals EPA 300.0 Analyst: CAS Nitrate - Nitrite 16.9 0.05 mg/L as N 1 04/11/2012 19:57 Inorganic Non-Metals EPA 300.0 Analyst: CAS Bromide 178 5.0 mg/L 25 04/16/2012 19:39 Fluoride 4.3 1.0 mg/L 10 04/12/2012 21:46 Sulfate 1100 20 mg/L 10 04/12/2012 21:46



# Laboratory Results

2005 N. Center Ave. Somerset PA 15501 814-443-1671 814-445-6666 FAX:814-445-6729 

### Client: GenOn ENERGY INC. - KEYSTONE STATION Client Sample ID: 101 Eff Lab Order: G1204522 Day 2 Project: Permit Renewal Sampled By: Client Lab ID: G1204522-001 Collection Date: 04/11/2012 10:30 Matrix: Aqueous Received Date: 04/11/2012 18:12 Analyses Result QL Q Units DF Date Analyzed



## Page 2 of 7

### Inorganic Non-Metals SM 5540C Analyst: KMW

MBAS 0.62 0.50 mg/L as LAS 10 04/12/2012 14:20
Inorganic Non-Metals EPA 350.1 Analyst: SLY Ammonia Nitrogen - Distilled 4.70 0.20 mg/L as N 2 04/17/2012 13:58 Inorganic Non-Metals SM 4500-P B.5 E Analyst: SEM Phosphorus, total 1.2 1.0 mg/L as P 10 04/12/2012 14:49 Indicator Organic Parameters EPA 420.1 Analyst: MLR Phenolics 20.0 40.0 U μg/L 2 04/13/2012 13:13 Inorganic Non Metals SM 4500 S D Analyst: KMW Sulfide 0.050 0.1 U mg/L 1 04/12/2012 15:30 Inorganic Non Metals SM 4500-SO3 B Analyst: MLS Lab Sulfite 2.0 2.0 U mg/L 1 04/11/2012 18:45 Inorganic Non-Metals EPA 351.2 Analyst: SLY Total Kjeldahl Nitrogen 21.0 2.0 mg/L as N 2 04/25/2012 08:55 Inorganic Metals SM 3112B Analyst: JEK Mercury 0.10 0.20 U μg/L 1 04/12/2012 13:04 Trivalent Chromium ug/L EPA 200.7/I-1230-85 Analyst: LAN Trivalent Chromium 10.0 20.0 U μg/L 1 04/27/2012 00:00 Inorganic Metals EPA 200.7 Analyst: MBG Iron, dissolved 10.0 50 U μg/L 1 04/17/2012 03:50 Inorganic Metals EPA 200.7 Analyst: MBG Aluminum 50.0 100 U μg/L 1 04/14/2012 14:48 Antimony 14 20.0 J μg/L 1 04/14/2012 14:48



# Laboratory Results

2005 N. Center Ave. Somerset PA 15501 814-443-1671 814-445-6666 FAX:814-445-6729 

### Client: GenOn ENERGY INC. - KEYSTONE STATION Client Sample ID: 101 Eff Lab Order: G1204522 Day 2 Project: Permit Renewal Sampled By: Client Lab ID: G1204522-001 Collection Date: 04/11/2012 10:30 Matrix: Aqueous Received Date: 04/11/2012 18:12 Analyses Result QL Q Units DF Date Analyzed



## Page 3 of 7

### Arsenic 10.0 20.0 U μg/L 1 04/14/2012 14:48

Barium 190 10.0 μg/L 1 04/14/2012 14:48 Beryllium 0.500 1.00 U μg/L 1 04/14/2012 14:48 Boron 235000 2500 μg/L 50 04/16/2012 15:18 Cadmium 1.6 2.00 J μg/L 1 04/14/2012 14:48 Calcium 5640000 2500 μg/L 25 04/16/2012 15:22 Chromium 5.00 10.0 U μg/L 1 04/14/2012 14:48 Cobalt 2.00 5.00 U μg/L 1 04/14/2012 14:48 Copper 5.00 10.0 U μg/L 1 04/14/2012 14:48 Iron 36 50.0 J μg/L 1 04/14/2012 14:48 Lead 10.0 20.0 U μg/L 1 04/14/2012 14:48 Magnesium 1970000 2500 μg/L 25 04/16/2012 15:22 Manganese 23700 10.0 μg/L 1 04/14/2012 14:48 Molybdenum 29.6 20.0 μg/L 1 04/14/2012 14:48 Nickel 21.2 10.0 μg/L 1 04/14/2012 14:48 Selenium 133 20.0 μg/L 1 04/14/2012 14:48 Silver 2.00 5.00 U μg/L 1 04/14/2012 14:48 Thallium 18 20.0 J μg/L 1 04/14/2012 14:48 Tin 50.0 100 U μg/L 1 04/14/2012 14:48 Titanium 27.7 5.00 μg/L 1 04/14/2012 14:48 Zinc 6.6 10.0 J μg/L 1 04/14/2012 14:48 Hardness (SM 2340B) 22200000 25000 μg/L 25 04/16/2012 15:22 Semi-Volatile Compounds EPA 625 Analyst: JB 1,2,4-Trichlorobenzene 4.8 9.5 U μg/L 0.95 04/20/2012 18:28 1,2-Dichlorobenzene 4.8 9.5 U μg/L 0.95 04/20/2012 18:28 1,3-Dichlorobenzene 4.8 9.5 U μg/L 0.95 04/20/2012 18:28 1,4-Dichlorobenzene 4.8 9.5 U μg/L 0.95 04/20/2012 18:28 2,4,6-Trichlorophenol 4.8 9.5 U μg/L 0.95 04/20/2012 18:28 2,4-Dichlorophenol 4.8 9.5 U μg/L 0.95 04/20/2012 18:28 2,4-Dimethylphenol 4.8 9.5 U μg/L 0.95 04/20/2012 18:28 2,4-Dinitrophenol 4.8 48 U μg/L 0.95 04/20/2012 18:28 2,4-Dinitrotoluene 4.8 9.5 U μg/L 0.95 04/20/2012 18:28 2,6-Dinitrotoluene 4.8 9.5 U μg/L 0.95 04/20/2012 18:28 2-Chloro-Naphthalene 4.8 9.5 U μg/L 0.95 04/20/2012 18:28



# Laboratory Results

2005 N. Center Ave. Somerset PA 15501 814-443-1671 814-445-6666 FAX:814-445-6729 

### Client: GenOn ENERGY INC. - KEYSTONE STATION Client Sample ID: 101 Eff Lab Order: G1204522 Day 2 Project: Permit Renewal Sampled By: Client Lab ID: G1204522-001 Collection Date: 04/11/2012 10:30 Matrix: Aqueous Received Date: 04/11/2012 18:12 Analyses Result QL Q Units DF Date Analyzed



## Page 4 of 7

### 2-Chlorophenol 4.8 9.5 U μg/L 0.95 04/20/2012 18:28

2-Methyl-4,6-dinitrophenol 4.8 48 U μg/L 0.95 04/20/2012 18:28 2-Nitrophenol 4.8 9.5 U μg/L 0.95 04/20/2012 18:28 3,3-Dichlorobenzidine 4.8 48 U μg/L 0.95 04/20/2012 18:28 4-Bromophenylphenylether 4.8 9.5 U μg/L 0.95 04/20/2012 18:28 4-Chloro-3-methylphenol 4.8 9.5 U μg/L 0.95 04/20/2012 18:28 4-Chlorophenylphenylether 4.8 9.5 U μg/L 0.95 04/20/2012 18:28 4-Nitrophenol 4.8 48 U μg/L 0.95 04/20/2012 18:28 Acenaphthene 4.8 9.5 U μg/L 0.95 04/20/2012 18:28 Acenaphthylene 4.8 9.5 U μg/L 0.95 04/20/2012 18:28 Anthracene 4.8 9.5 U μg/L 0.95 04/20/2012 18:28 Azobenzene 4.8 9.5 U μg/L 0.95 04/20/2012 18:28 Benzidine 4.8 9.5 U μg/L 0.95 04/20/2012 18:28 Benzo(a)anthracene 4.8 9.5 U μg/L 0.95 04/20/2012 18:28 Benzo(a)pyrene 4.8 9.5 U μg/L 0.95 04/20/2012 18:28 Benzo(b)fluoranthene 4.8 9.5 U μg/L 0.95 04/20/2012 18:28 Benzo(g,h,i)perylene 4.8 9.5 U μg/L 0.95 04/20/2012 18:28 Benzo(k)fluoranthene 4.8 9.5 U μg/L 0.95 04/20/2012 18:28 bis(2-Chloroethoxy)methane 4.8 9.5 U μg/L 0.95 04/20/2012 18:28 bis(2-Chloroethyl)ether 4.8 9.5 U μg/L 0.95 04/20/2012 18:28 bis(2-Chloroisopropyl)ether 4.8 9.5 U μg/L 0.95 04/20/2012 18:28 bis(2-Ethylhexyl)phthalate 1.9 4.8 U μg/L 0.95 04/20/2012 18:28 Butyl benzylphthalate 4.8 9.5 U μg/L 0.95 04/20/2012 18:28 Chrysene 4.8 9.5 U μg/L 0.95 04/20/2012 18:28 Di-N-Butyl Phthalate 4.8 9.5 U μg/L 0.95 04/20/2012 18:28 Di-N-Octylphthalate 4.8 9.5 U μg/L 0.95 04/20/2012 18:28 Di-n-propylnitrosamine 4.8 9.5 U μg/L 0.95 04/20/2012 18:28 Dibenzo(a,h)anthracene 4.8 9.5 U μg/L 0.95 04/20/2012 18:28 Diethyl Phthalate 4.8 9.5 U μg/L 0.95 04/20/2012 18:28 Dimethyl Phthalate 4.8 9.5 U μg/L 0.95 04/20/2012 18:28 Fluoranthene 4.8 9.5 U μg/L 0.95 04/20/2012 18:28 Fluorene 4.8 9.5 U μg/L 0.95 04/20/2012 18:28 Hexachlorobenzene 4.8 9.5 U μg/L 0.95 04/20/2012 18:28 Hexachlorobutadiene 4.8 9.5 U μg/L 0.95 04/20/2012 18:28 Hexachlorocyclopentadiene 4.8 48 U μg/L 0.95 04/20/2012 18:28



# Laboratory Results

2005 N. Center Ave. Somerset PA 15501 814-443-1671 814-445-6666 FAX:814-445-6729 

### Client: GenOn ENERGY INC. - KEYSTONE STATION Client Sample ID: 101 Eff Lab Order: G1204522 Day 2 Project: Permit Renewal Sampled By: Client Lab ID: G1204522-001 Collection Date: 04/11/2012 10:30 Matrix: Aqueous Received Date: 04/11/2012 18:12 Analyses Result QL Q Units DF Date Analyzed



## Page 5 of 7

### Hexachloroethane 4.8 9.5 U μg/L 0.95 04/20/2012 18:28

Indeno(1,2,3-cd)pyrene 4.8 9.5 U μg/L 0.95 04/20/2012 18:28 Isophorone 1.9 4.8 U μg/L 0.95 04/20/2012 18:28 n-Nitrosodimethylamine 4.8 9.5 U μg/L 0.95 04/20/2012 18:28 n-Nitrosodiphenylamine 9.5 19 U μg/L 0.95 04/20/2012 18:28 Naphthalene 4.8 9.5 U μg/L 0.95 04/20/2012 18:28 Nitrobenzene 4.8 9.5 U μg/L 0.95 04/20/2012 18:28 Pentachlorophenol 4.8 48 U μg/L 0.95 04/20/2012 18:28 Phenanthrene 4.8 9.5 U μg/L 0.95 04/20/2012 18:28 Phenol 4.8 9.5 U μg/L 0.95 04/20/2012 18:28 Pyrene 4.8 9.5 U μg/L 0.95 04/20/2012 18:28 TIC: 2H-Azepin-2-one, hexahydro-6-methyl- NA 3.8 U μg/L 0.95 04/20/2012 18:28 TIC: 4-Heptanol, 2,4-dimethyl- NA 3.8 U μg/L 0.95 04/20/2012 18:28 TIC: 8,9-Dicyanoacenaphtho(1,2-b)pyrazine NA 3.8 U μg/L 0.95 04/20/2012 18:28 TIC: Chloroiodomethane NA 3.8 U μg/L 0.95 04/20/2012 18:28 TIC: Methane, bromodichloro- NA 3.8 U μg/L 0.95 04/20/2012 18:28 TIC: Pentane, 1-chloro-5-iodo- NA 3.8 U μg/L 0.95 04/20/2012 18:28 Volatile Organic Compounds EPA 624 Analyst: SJM 1,1,1-Trichloroethane 0.200 0.5 U μg/L 1 04/12/2012 21:09 1,1,2,2-Tetrachloroethane 0.200 0.5 U μg/L 1 04/12/2012 21:09 1,1,2-Trichloroethane 0.500 1.0 U μg/L 1 04/12/2012 21:09 1,1-Dichloroethane 0.200 0.5 U μg/L 1 04/12/2012 21:09 1,1-Dichloroethene 0.200 0.5 U μg/L 1 04/12/2012 21:09 1,2-Dichloroethane 0.200 0.5 U μg/L 1 04/12/2012 21:09 1,2-Dichloropropane 0.200 0.5 U μg/L 1 04/12/2012 21:09 2-Chloroethylvinyl ether 0.500 1.0 U μg/L 1 04/12/2012 21:09 Benzene 0.200 0.5 U μg/L 1 04/12/2012 21:09 Bromoform 0.200 0.5 U μg/L 1 04/12/2012 21:09 Bromomethane 0.500 1.0 U μg/L 1 04/12/2012 21:09 Carbon Tetrachloride 0.200 0.5 U μg/L 1 04/12/2012 21:09 Chlorobenzene 0.200 0.5 U μg/L 1 04/12/2012 21:09 Chlorodibromomethane 0.400 1.0 U μg/L 1 04/12/2012 21:09 Chloroethane 0.200 0.5 U μg/L 1 04/12/2012 21:09 Chloroform 0.3 0.5 J μg/L 1 04/12/2012 21:09



# Laboratory Results

2005 N. Center Ave. Somerset PA 15501 814-443-1671 814-445-6666 FAX:814-445-6729 

### Client: GenOn ENERGY INC. - KEYSTONE STATION Client Sample ID: 101 Eff Lab Order: G1204522 Day 2 Project: Permit Renewal Sampled By: Client Lab ID: G1204522-001 Collection Date: 04/11/2012 10:30 Matrix: Aqueous Received Date: 04/11/2012 18:12 Analyses Result QL Q Units DF Date Analyzed



## Page 6 of 7

### Chloromethane 0.200 0.5 U μg/L 1 04/12/2012 21:09

Dichlorobromomethane 0.200 0.5 U μg/L 1 04/12/2012 21:09 Ethylbenzene 0.200 0.5 U μg/L 1 04/12/2012 21:09 Methylene Chloride 0.200 0.5 U μg/L 1 04/12/2012 21:09 Tetrachloroethene 0.200 0.5 U μg/L 1 04/12/2012 21:09 Toluene 0.200 0.5 U μg/L 1 04/12/2012 21:09 trans-1,2-Dichloroethene 0.500 1.0 U μg/L 1 04/12/2012 21:09 Trichloroethene 0.200 0.5 U μg/L 1 04/12/2012 21:09 Vinyl Chloride 0.200 0.5 U μg/L 1 04/12/2012 21:09 1,3-Dichloropropylene 0.200 0.5 U μg/L 1 04/12/2012 21:09 TIC: None detected NA 3.0 U 1 04/12/2012 21:09 Volatile Organic Compounds EPA 624 Analyst: SJM Acrolein 2.00 5.00 U μg/L 1 04/12/2012 21:09 Acrylonitrile 0.500 1.00 U μg/L 1 04/12/2012 21:09 Indicator Organic Parameters EPA 1664 Analyst: AMS Oil & Grease 2.06 5 U mg/L 1.03 04/17/2012 14:38 Indicator Organic Parameters SM 20 5310-C Analyst: ACG Total Organic Carbon 1.8 0.5 mg/L 1 04/13/2012 13:25



# Laboratory Results

2005 N. Center Ave. Somerset PA 15501 814-443-1671 814-445-6666 FAX:814-445-6729 

### Client: GenOn ENERGY INC. - KEYSTONE STATION Client Sample ID: 101 Eff Lab Order: G1204522 Day 2 Project: Permit Renewal Sampled By: Client Lab ID: G1204522-001 Collection Date: 04/11/2012 10:30 Matrix: Aqueous Received Date: 04/11/2012 18:12 Analyses Result QL Q Units DF Date Analyzed



## Page 7 of 7

## No problems were encountered during analysis of this workorder, except if noted in this report.

Samples were not filtered in the field for dissolved metals; samples were lab filtered. 2005 N. Center Ave. Somerset PA 15501 814-443-1671 814-445-6666 FAX:814-445-6729 

### Client: GenOn ENERGY INC. - KEYSTONE STATION 

# CASE NARRATIVE Project: Permit Renewal Lab Order: G1204596

Legend: ND - Not Detected at the Quantitation Limit S - Spike Recovery outside accepted recovery limits J - Indicates an estimated value R - RPD outside accepted recovery limits U - The analyte was not detected at or above the listed E - Value above quantitation range concentration, which is below the laboratory quantitation limit ** - Value exceeds Action Limit B - Analyte detected in the associated Method Blank H - Method Hold Time Exceeded Q - Qualifier QL - Quantitation Limit DF - Dilution Factor MCL - Contaminant Limit 

## Page 1 of 7

### Inorganic Non-Metals SM 2540 C Analyst: KLS

Total dissolved solids 24900 100 mg/L 5 04/13/2012 08:58 Physical Tests SM 2540D Analyst: KLS Total suspended solids 4 1 mg/L 1 04/19/2012 12:02 Indicator Organic Parameters SM 5210 B Analyst: MMR BOD 5-day 1 2 J mg/L 1.5 04/13/2012 12:40 Finish Date/Time 4/18/2012 12:20 0 mg/L 1.5 04/13/2012 12:40
Inorganic Non Metals SM 4500-CNI Analyst: SAG Cyanide, free 5.00 10 U μg/L 1 04/17/2012 10:59 Inorganic Non Metals SM 4500-CN-C&E Analyst: MLR Cyanide, total 5.0 10 U μg/L 1 04/17/2012 14:49 Indicator Organic Parameters HACH 8000 Analyst: SEM Chemical Oxygen Demand 640 50 mg/L 5 04/13/2012 17:30 Physical Tests SM 2120C Analyst: SAG Color 10 10 U Color Units 1 04/12/2012 18:55 Inorganic Non Metals USGS I-1230-85 Analyst: SAG Hexavalent Chromium 10.0 20 U μg/L 1 04/12/2012 19:20 Inorganic Non-Metals EPA 300.0 Analyst: CAS Nitrate - Nitrite 20.6 0.50 mg/L as N 10 04/13/2012 00:49 Inorganic Non-Metals EPA 300.0 Analyst: CAS Bromide 119 5.0 mg/L 25 04/17/2012 13:06 Fluoride 3.7 1.0 mg/L 10 04/13/2012 00:49 Sulfate 914 20 mg/L 10 04/13/2012 00:49



# Laboratory Results

2005 N. Center Ave. Somerset PA 15501 814-443-1671 814-445-6666 FAX:814-445-6729 

### Client: GenOn ENERGY INC. - KEYSTONE STATION Client Sample ID: 101 Eff Lab Order: G1204596 Day 3 Project: Permit Renewal Sampled By: Client Lab ID: G1204596-001 Collection Date: 04/12/2012 10:00 Matrix: Aqueous Received Date: 04/12/2012 17:38 Analyses Result QL Q Units DF Date Analyzed



## Page 2 of 7

### Inorganic Non-Metals SM 5540C Analyst: CAS

MBAS 2.1 0.50 mg/L as LAS 10 04/13/2012 08:15
Inorganic Non-Metals EPA 350.1 Analyst: SLY Ammonia Nitrogen - Distilled 5.01 0.20 mg/L as N 2 04/18/2012 11:17 Inorganic Non-Metals SM 4500-P B.5 E Analyst: SEM Phosphorus, total 0.5 2.0 J mg/L as P 20 04/17/2012 13:32 Indicator Organic Parameters EPA 420.1 Analyst: MLR Phenolics 50.0 100 U μg/L 5 04/19/2012 14:46 Inorganic Non Metals SM 4500 S D Analyst: MMR Sulfide 0.050 0.1 U mg/L 1 04/13/2012 04:50 Inorganic Non Metals SM 4500-SO3 B Analyst: SAG Lab Sulfite 2.0 2.0 U mg/L 1 04/12/2012 19:10 Inorganic Non-Metals EPA 351.2 Analyst: SLY Total Kjeldahl Nitrogen 19.3 2.0 mg/L as N 2 04/25/2012 08:57 Inorganic Metals SM 3112B Analyst: JEK Mercury 0.10 0.20 U μg/L 1 04/17/2012 10:06 Trivalent Chromium ug/L EPA 200.7/I-1230-85 Analyst: LAN Trivalent Chromium 10.0 20.0 U μg/L 1 04/27/2012 00:00 Inorganic Metals EPA 200.7 Analyst: GMG Iron, dissolved 38 50 J μg/L 1 04/18/2012 06:42 Inorganic Metals EPA 200.7 Analyst: MBG Aluminum 50.0 100 U μg/L 1 04/17/2012 04:52 Antimony 13 20.0 J μg/L 1 04/17/2012 04:52



# Laboratory Results

2005 N. Center Ave. Somerset PA 15501 814-443-1671 814-445-6666 FAX:814-445-6729 

### Client: GenOn ENERGY INC. - KEYSTONE STATION Client Sample ID: 101 Eff Lab Order: G1204596 Day 3 Project: Permit Renewal Sampled By: Client Lab ID: G1204596-001 Collection Date: 04/12/2012 10:00 Matrix: Aqueous Received Date: 04/12/2012 17:38 Analyses Result QL Q Units DF Date Analyzed



## Page 3 of 7

### Arsenic 10.0 20.0 U μg/L 1 04/17/2012 04:52

Barium 190 10.0 μg/L 1 04/17/2012 04:52 Beryllium 0.500 1.00 U μg/L 1 04/17/2012 04:52 Boron 217000 2500 μg/L 50 04/17/2012 12:57 Cadmium 1.1 2.00 J μg/L 1 04/17/2012 04:52 Calcium 5260000 2500 μg/L 25 04/17/2012 13:01 Chromium 5.00 10.0 U μg/L 1 04/17/2012 04:52 Cobalt 2.00 5.00 U μg/L 1 04/17/2012 04:52 Copper 5.00 10.0 U μg/L 1 04/17/2012 04:52 Iron 56.1 50.0 μg/L 1 04/17/2012 04:52 Lead 10.0 20.0 U μg/L 1 04/17/2012 04:52 Magnesium 1900000 2500 μg/L 25 04/17/2012 13:01 Manganese 19300 10.0 μg/L 1 04/17/2012 04:52 Molybdenum 31.8 20.0 μg/L 1 04/17/2012 04:52 Nickel 17.2 10.0 μg/L 1 04/17/2012 04:52 Selenium 115 20.0 μg/L 1 04/17/2012 04:52 Silver 2.00 5.00 U μg/L 1 04/17/2012 04:52 Thallium 15 20.0 J μg/L 1 04/17/2012 04:52 Tin 50.0 100 U μg/L 1 04/17/2012 04:52 Titanium 26.9 5.00 μg/L 1 04/17/2012 04:52 Zinc 4.00 10.0 U μg/L 1 04/17/2012 04:52 Hardness (SM 2340B) 21000000 25000 μg/L 25 04/17/2012 13:01 Semi-Volatile Compounds EPA 625 Analyst: JB 1,2,4-Trichlorobenzene 4.8 9.5 U μg/L 0.95 04/20/2012 19:40 1,2-Dichlorobenzene 4.8 9.5 U μg/L 0.95 04/20/2012 19:40 1,3-Dichlorobenzene 4.8 9.5 U μg/L 0.95 04/20/2012 19:40 1,4-Dichlorobenzene 4.8 9.5 U μg/L 0.95 04/20/2012 19:40 2,4,6-Trichlorophenol 4.8 9.5 U μg/L 0.95 04/20/2012 19:40 2,4-Dichlorophenol 4.8 9.5 U μg/L 0.95 04/20/2012 19:40 2,4-Dimethylphenol 4.8 9.5 U μg/L 0.95 04/20/2012 19:40 2,4-Dinitrophenol 4.8 48 U μg/L 0.95 04/20/2012 19:40 2,4-Dinitrotoluene 4.8 9.5 U μg/L 0.95 04/20/2012 19:40 2,6-Dinitrotoluene 4.8 9.5 U μg/L 0.95 04/20/2012 19:40 2-Chloro-Naphthalene 4.8 9.5 U μg/L 0.95 04/20/2012 19:40



# Laboratory Results

2005 N. Center Ave. Somerset PA 15501 814-443-1671 814-445-6666 FAX:814-445-6729 

### Client: GenOn ENERGY INC. - KEYSTONE STATION Client Sample ID: 101 Eff Lab Order: G1204596 Day 3 Project: Permit Renewal Sampled By: Client Lab ID: G1204596-001 Collection Date: 04/12/2012 10:00 Matrix: Aqueous Received Date: 04/12/2012 17:38 Analyses Result QL Q Units DF Date Analyzed



## Page 4 of 7

### 2-Chlorophenol 4.8 9.5 U μg/L 0.95 04/20/2012 19:40

2-Methyl-4,6-dinitrophenol 4.8 48 U μg/L 0.95 04/20/2012 19:40 2-Nitrophenol 4.8 9.5 U μg/L 0.95 04/20/2012 19:40 3,3-Dichlorobenzidine 4.8 48 U μg/L 0.95 04/20/2012 19:40 4-Bromophenylphenylether 4.8 9.5 U μg/L 0.95 04/20/2012 19:40 4-Chloro-3-methylphenol 4.8 9.5 U μg/L 0.95 04/20/2012 19:40 4-Chlorophenylphenylether 4.8 9.5 U μg/L 0.95 04/20/2012 19:40 4-Nitrophenol 4.8 48 U μg/L 0.95 04/20/2012 19:40 Acenaphthene 4.8 9.5 U μg/L 0.95 04/20/2012 19:40 Acenaphthylene 4.8 9.5 U μg/L 0.95 04/20/2012 19:40 Anthracene 4.8 9.5 U μg/L 0.95 04/20/2012 19:40 Azobenzene 4.8 9.5 U μg/L 0.95 04/20/2012 19:40 Benzidine 4.8 9.5 U μg/L 0.95 04/20/2012 19:40 Benzo(a)anthracene 4.8 9.5 U μg/L 0.95 04/20/2012 19:40 Benzo(a)pyrene 4.8 9.5 U μg/L 0.95 04/20/2012 19:40 Benzo(b)fluoranthene 4.8 9.5 U μg/L 0.95 04/20/2012 19:40 Benzo(g,h,i)perylene 4.8 9.5 U μg/L 0.95 04/20/2012 19:40 Benzo(k)fluoranthene 4.8 9.5 U μg/L 0.95 04/20/2012 19:40 bis(2-Chloroethoxy)methane 4.8 9.5 U μg/L 0.95 04/20/2012 19:40 bis(2-Chloroethyl)ether 4.8 9.5 U μg/L 0.95 04/20/2012 19:40 bis(2-Chloroisopropyl)ether 4.8 9.5 U μg/L 0.95 04/20/2012 19:40 bis(2-Ethylhexyl)phthalate 1.9 4.8 U μg/L 0.95 04/20/2012 19:40 Butyl benzylphthalate 4.8 9.5 U μg/L 0.95 04/20/2012 19:40 Chrysene 4.8 9.5 U μg/L 0.95 04/20/2012 19:40 Di-N-Butyl Phthalate 4.8 9.5 U μg/L 0.95 04/20/2012 19:40 Di-N-Octylphthalate 4.8 9.5 U μg/L 0.95 04/20/2012 19:40 Di-n-propylnitrosamine 4.8 9.5 U μg/L 0.95 04/20/2012 19:40 Dibenzo(a,h)anthracene 4.8 9.5 U μg/L 0.95 04/20/2012 19:40 Diethyl Phthalate 4.8 9.5 U μg/L 0.95 04/20/2012 19:40 Dimethyl Phthalate 4.8 9.5 U μg/L 0.95 04/20/2012 19:40 Fluoranthene 4.8 9.5 U μg/L 0.95 04/20/2012 19:40 Fluorene 4.8 9.5 U μg/L 0.95 04/20/2012 19:40 Hexachlorobenzene 4.8 9.5 U μg/L 0.95 04/20/2012 19:40 Hexachlorobutadiene 4.8 9.5 U μg/L 0.95 04/20/2012 19:40 Hexachlorocyclopentadiene 4.8 48 U μg/L 0.95 04/20/2012 19:40



# Laboratory Results

2005 N. Center Ave. Somerset PA 15501 814-443-1671 814-445-6666 FAX:814-445-6729 

### Client: GenOn ENERGY INC. - KEYSTONE STATION Client Sample ID: 101 Eff Lab Order: G1204596 Day 3 Project: Permit Renewal Sampled By: Client Lab ID: G1204596-001 Collection Date: 04/12/2012 10:00 Matrix: Aqueous Received Date: 04/12/2012 17:38 Analyses Result QL Q Units DF Date Analyzed



## Page 5 of 7

### Hexachloroethane 4.8 9.5 U μg/L 0.95 04/20/2012 19:40

Indeno(1,2,3-cd)pyrene 4.8 9.5 U μg/L 0.95 04/20/2012 19:40 Isophorone 1.9 4.8 U μg/L 0.95 04/20/2012 19:40 n-Nitrosodimethylamine 4.8 9.5 U μg/L 0.95 04/20/2012 19:40 n-Nitrosodiphenylamine 9.5 19 U μg/L 0.95 04/20/2012 19:40 Naphthalene 4.8 9.5 U μg/L 0.95 04/20/2012 19:40 Nitrobenzene 4.8 9.5 U μg/L 0.95 04/20/2012 19:40 Pentachlorophenol 4.8 48 U μg/L 0.95 04/20/2012 19:40 Phenanthrene 4.8 9.5 U μg/L 0.95 04/20/2012 19:40 Phenol 4.8 9.5 U μg/L 0.95 04/20/2012 19:40 Pyrene 4.8 9.5 U μg/L 0.95 04/20/2012 19:40 TIC: 1H-Imidazole, 4-methyl-5-nitro- NA 3.8 U μg/L 0.95 04/20/2012 19:40 TIC: 2-[2-[2-[2-[2-(2-Methoxyethoxy)ethoxy] NA 3.8 U μg/L 0.95 04/20/2012 19:40 TIC: 2H-Azepin-2-one, hexahydro-6-methyl- NA 3.8 U μg/L 0.95 04/20/2012 19:40 TIC: 4-Heptanol, 2,4-dimethyl- NA 3.8 U μg/L 0.95 04/20/2012 19:40 TIC: 4-Heptanol, 4-methyl- NA 3.8 U μg/L 0.95 04/20/2012 19:40 TIC: Chloroiodomethane NA 3.8 U μg/L 0.95 04/20/2012 19:40 TIC: Methane, bromodichloro- NA 3.8 U μg/L 0.95 04/20/2012 19:40 TIC: Pentane, 1-chloro-5-iodo- NA 3.8 U μg/L 0.95 04/20/2012 19:40 Volatile Organic Compounds EPA 624 Analyst: SJM 1,1,1-Trichloroethane 0.200 0.5 U μg/L 1 04/14/2012 08:34 1,1,2,2-Tetrachloroethane 0.200 0.5 U μg/L 1 04/14/2012 08:34 1,1,2-Trichloroethane 0.500 1.0 U μg/L 1 04/14/2012 08:34 1,1-Dichloroethane 0.200 0.5 U μg/L 1 04/14/2012 08:34 1,1-Dichloroethene 0.200 0.5 U μg/L 1 04/14/2012 08:34 1,2-Dichloroethane 0.200 0.5 U μg/L 1 04/14/2012 08:34 1,2-Dichloropropane 0.200 0.5 U μg/L 1 04/14/2012 08:34 2-Chloroethylvinyl ether 0.500 1.0 U μg/L 1 04/14/2012 08:34 Benzene 0.200 0.5 U μg/L 1 04/14/2012 08:34 Bromoform 0.200 0.5 U μg/L 1 04/14/2012 08:34 Bromomethane 0.500 1.0 U μg/L 1 04/14/2012 08:34 Carbon Tetrachloride 0.200 0.5 U μg/L 1 04/14/2012 08:34 Chlorobenzene 0.200 0.5 U μg/L 1 04/14/2012 08:34 Chlorodibromomethane 0.400 1.0 U μg/L 1 04/14/2012 08:34



# Laboratory Results

2005 N. Center Ave. Somerset PA 15501 814-443-1671 814-445-6666 FAX:814-445-6729 

### Client: GenOn ENERGY INC. - KEYSTONE STATION Client Sample ID: 101 Eff Lab Order: G1204596 Day 3 Project: Permit Renewal Sampled By: Client Lab ID: G1204596-001 Collection Date: 04/12/2012 10:00 Matrix: Aqueous Received Date: 04/12/2012 17:38 Analyses Result QL Q Units DF Date Analyzed



## Page 6 of 7

### Chloroethane 0.200 0.5 U μg/L 1 04/14/2012 08:34

Chloroform 0.3 0.5 J μg/L 1 04/14/2012 08:34 Chloromethane 0.200 0.5 U μg/L 1 04/14/2012 08:34 Dichlorobromomethane 0.200 0.5 U μg/L 1 04/14/2012 08:34 Ethylbenzene 0.200 0.5 U μg/L 1 04/14/2012 08:34 Methylene Chloride 0.200 0.5 U μg/L 1 04/14/2012 08:34 Tetrachloroethene 0.200 0.5 U μg/L 1 04/14/2012 08:34 Toluene 0.200 0.5 U μg/L 1 04/14/2012 08:34 trans-1,2-Dichloroethene 0.500 1.0 U μg/L 1 04/14/2012 08:34 Trichloroethene 0.200 0.5 U μg/L 1 04/14/2012 08:34 Vinyl Chloride 0.200 0.5 U μg/L 1 04/14/2012 08:34 1,3-Dichloropropylene 0.200 0.5 U μg/L 1 04/14/2012 08:34 TIC: None detected NA 3.0 U 1 04/14/2012 08:34 Volatile Organic Compounds EPA 624 Analyst: SJM Acrolein 2.00 5.00 U μg/L 1 04/14/2012 08:34 Acrylonitrile 0.500 1.00 U μg/L 1 04/14/2012 08:34 Indicator Organic Parameters EPA 1664 Analyst: JDH Oil & Grease 2.13 5 U mg/L 1.06 04/18/2012 14:09 Indicator Organic Parameters SM 20 5310-C Analyst: ACG Total Organic Carbon 1.8 0.5 mg/L 1 04/18/2012 18:40



# Laboratory Results

2005 N. Center Ave. Somerset PA 15501 814-443-1671 814-445-6666 FAX:814-445-6729 

### Client: GenOn ENERGY INC. - KEYSTONE STATION Client Sample ID: 101 Eff Lab Order: G1204596 Day 3 Project: Permit Renewal Sampled By: Client Lab ID: G1204596-001 Collection Date: 04/12/2012 10:00 Matrix: Aqueous Received Date: 04/12/2012 17:38 Analyses Result QL Q Units DF Date Analyzed



## Page 7 of 7

# Tuesday, May01, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1204709 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 4/17/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 01-May-12 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1204709 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 4/17/2012 8:55:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1204709
Lab ID: G1204709-001

DF 

# Geochemical Testing Date: 01-May-12

Received Date: 4/17/2012 5:42:06 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 4/18/2012 2:11:28 PM 1 mg/L 1 7 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 4/18/2012 2:11:08 PM 100 mg/L 5 26900 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 4/18/2012 9:15:00 AM 2 mg/L 1.5 < 2 25 Finish Date/Time 4/18/2012 9:15:00 AM 0 mg/L 1.5 4/23/2012 09:00 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 4/18/2012 11:16:00 A M 1000 mg/L 200 14700 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 4/18/2012 7:18:34 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 4/18/2012 7:18:34 PM 0.02 mg/L 1 0.11 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 4/20/2012 8:32:18 AM 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 4/18/2012 9:59:56 PM 0.1 mg/L 1 < 0.1 0 Arsenic 4/18/2012 9:59:56 PM 0.02 mg/L 1 < 0.02 0 Beryllium 4/18/2012 9:59:56 PM 0.001 mg/L 1 < 0.001 0.8 Boron 4/18/2012 9:59:56 PM 0.05 mg/L 1 232 0 Cadmium 4/18/2012 9:59:56 PM 0.002 mg/L 1 < 0.002 0 Chromium 4/18/2012 9:59:56 PM 0.01 mg/L 1 < 0.01 0 Copper 4/18/2012 9:59:56 PM 0.01 mg/L 1 < 0.01 0.1 Iron 4/18/2012 9:59:56 PM 0.05 mg/L 1 < 0.05 0 Lead 4/18/2012 9:59:56 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 4/18/2012 9:59:56 PM 0.01 mg/L 1 18.4 0 Nickel 4/18/2012 9:59:56 PM 0.01 mg/L 1 < 0.01 0 Selenium 4/18/2012 9:59:56 PM 0.02 mg/L 1 0.10 3.4 Silver 4/19/2012 3:32:00 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 4/18/2012 9:59:56 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 4/27/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: JDH

Oil & Grease 4/20/2012 7:16:00 AM 5 mg/L 1 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 4/17/2012 8:45:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1204709
Lab ID: G1204709-002

DF 

# Geochemical Testing Date: 01-May-12

Received Date: 4/17/2012 5:42:06 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 4/18/2012 2:11:07 PM 200 mg/L 10 35000 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 4/18/2012 2:11:28 PM 100 mg/L 20 900 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 4/18/2012 9:15:00 AM 3 mg/L 3 8 0 Finish Date/Time 4/18/2012 9:15:00 AM 0 mg/L 3 4/23/2012 09:00 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 4/18/2012 11:16:00 A M 1000 mg/L 200 15100 0 

### INORGANIC METALS USGS I-1230-85 Analyst: SEM

Hexavalent Chromium 4/17/2012 6:50:00 PM 0.020 mg/L 1 0.020 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 4/18/2012 7:21:17 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 4/18/2012 7:21:17 PM 0.02 mg/L 1 0.43 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 4/20/2012 8:38:59 AM 0.10 mg/L 500 < 0.10 0 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Aluminum 4/24/2012 11:19:00 A M 1.0 mg/L 1 18.6 0 Arsenic 4/24/2012 11:19:00 A M 0.20 mg/L 1 < 0.20 0 Beryllium 4/24/2012 11:19:00 A M 0.010 mg/L 1 < 0.010 0 Boron 4/24/2012 3:51:39 PM 5.00 mg/L 10 332 0 Cadmium 4/24/2012 11:19:00 A M 0.020 mg/L 1 0.062 0 Chromium 4/24/2012 11:19:00 A M 0.10 mg/L 1 0.11 0 Copper 4/24/2012 11:19:00 A M 0.10 mg/L 1 < 0.10 0 Iron 4/24/2012 11:19:00 A M 0.50 mg/L 1 98.2 0 Lead 4/24/2012 11:19:00 A M 0.20 mg/L 1 < 0.20 0 Manganese 4/24/2012 11:19:00 A M 0.10 mg/L 1 333 0 Nickel 4/24/2012 11:19:00 A M 0.10 mg/L 1 2.18 0 Selenium 4/24/2012 11:19:00 A M 0.20 mg/L 1 0.92 0 Silver 4/24/2012 11:19:00 A M 0.050 mg/L 1 < 0.050 0 Zinc 4/24/2012 6:32:47 PM 0.10 mg/L 1 0.21 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 4/27/2012 0.02 mg/L 1 0.09 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: JDH

Oil & Grease 4/20/2012 7:17:00 AM 25 mg/L 5 < 25 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Page 1 of 4 Wednesday, May 09, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1204A37 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 4/25/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Ti m ot hy W . Ber gst r

esser Di r

ect orofTechni cal Ser vi ces

# Page 2 of 4 09-May-12 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1204A37 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit

# Page 3 of 4 Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 4/25/2012 7:30:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1204A37
Lab ID: G1204A37-001

DF 

# Geochemical Testing Date: 09-May-12

Received Date: 4/25/2012 6:20:22 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 4/26/2012 9:10:14 AM 1 mg/L 1 2 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 4/26/2012 9:08:49 AM 100 mg/L 5 23700 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 4/26/2012 8:30:00 AM 2 mg/L 1.5 < 2 25 Finish Date/Time 4/26/2012 8:30:00 AM 0 mg/L 1.5 5/1/2012 08:25 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 4/27/2012 2:32:00 PM 1000 mg/L 200 11900 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 4/27/2012 11:29:00 P M 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 4/27/2012 11:29:00 P M 0.02 mg/L 1 0.12 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 4/26/2012 1:47:31 PM 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 4/28/2012 12:45:00 A M 0.1 mg/L 1 < 0.1 0 Arsenic 4/28/2012 12:45:00 A M 0.02 mg/L 1 < 0.02 0 Beryllium 4/28/2012 12:45:00 A M 0.001 mg/L 1 < 0.001 0.8 Boron 4/30/2012 3:00:09 PM 2.50 mg/L 50 234 0 Cadmium 4/28/2012 12:45:00 A M 0.002 mg/L 1 0.002 0 Chromium 4/28/2012 12:45:00 A M 0.01 mg/L 1 < 0.01 0 Copper 4/28/2012 12:45:00 A M 0.01 mg/L 1 < 0.01 0.1 Iron 4/28/2012 12:45:00 A M 0.05 mg/L 1 < 0.05 0 Lead 4/28/2012 12:45:00 A M 0.02 mg/L 1 < 0.02 0.1 Manganese 4/28/2012 12:45:00 A M 0.01 mg/L 1 23.2 0 Nickel 4/28/2012 12:45:00 A M 0.01 mg/L 1 0.01 0 Selenium 4/28/2012 12:45:00 A M 0.02 mg/L 1 0.11 3.4 Silver 4/28/2012 12:45:00 A M 0.005 mg/L 1 < 0.005 0.1 Zinc 4/28/2012 12:45:00 A M 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 5/8/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: AMS

Oil & Grease 4/27/2012 1:52:00 PM 5 mg/L 1 < 5 15

I.D. 56-00306 PA DEP

# Page 4 of 4 Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 4/25/2012 7:10:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1204A37
Lab ID: G1204A37-002

DF 

# Geochemical Testing Date: 09-May-12

Received Date: 4/25/2012 6:20:22 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 4/26/2012 9:08:50 AM 200 mg/L 10 32700 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 4/26/2012 9:10:15 AM 100 mg/L 20 32600 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 4/26/2012 8:30:00 AM 6 mg/L 6 21 0 Finish Date/Time 4/26/2012 8:30:00 AM 0 mg/L 6 5/1/2012 08:25 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 4/27/2012 2:32:00 PM 1000 mg/L 200 14200 0 

### INORGANIC METALS USGS I-1230-85 Analyst: KMW

Hexavalent Chromium 4/25/2012 6:45:00 PM 0.020 mg/L 1 0.020 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 4/27/2012 11:53:00 P M 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 4/27/2012 11:53:00 P M 0.02 mg/L 1 0.25 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 4/26/2012 1:49:46 PM 0.10 mg/L 500 0.89 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 4/26/2012 4:44:06 PM 1.0 mg/L 1 553 0 Arsenic 4/26/2012 4:44:06 PM 0.20 mg/L 1 2.23 0 Beryllium 4/26/2012 4:44:06 PM 0.010 mg/L 1 0.067 0 Boron 4/27/2012 6:00:00 PM 5.00 mg/L 10 354 0 Cadmium 4/26/2012 4:44:06 PM 0.020 mg/L 1 < 0.020 0 Chromium 4/26/2012 4:44:06 PM 0.10 mg/L 1 2.37 0 Copper 4/26/2012 4:44:06 PM 0.10 mg/L 1 1.98 0 Iron 4/26/2012 4:44:06 PM 0.50 mg/L 1 2460 0 Lead 4/26/2012 4:44:06 PM 0.20 mg/L 1 0.89 0 Manganese 4/26/2012 4:44:06 PM 0.10 mg/L 1 291 0 Nickel 4/26/2012 4:44:06 PM 0.10 mg/L 1 4.58 0 Selenium 4/26/2012 4:44:06 PM 0.20 mg/L 1 4.51 0 Silver 4/26/2012 4:44:06 PM 0.050 mg/L 1 < 0.050 0 Zinc 4/26/2012 4:44:06 PM 0.10 mg/L 1 5.34 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 5/8/2012 0.02 mg/L 1 2.35 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: AMS

Oil & Grease 4/27/2012 1:53:00 PM 22 mg/L 4.35 < 22 0 NOTES: The pH of the sample was >2.

I.D. 56-00306 PA DEP

# Page 1 of 4 Wednesday, May 09, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1205064 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 5/1/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Ti m ot hy W . Ber gst r

esser Di r

ect orofTechni cal Ser vi ces

# Page 2 of 4 09-May-12 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1205064 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit

# Page 3 of 4 Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 5/1/2012 10:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1205064
Lab ID: G1205064-001

DF 

# Geochemical Testing Date: 09-May-12

Received Date: 5/1/2012 5:08:07 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 5/2/2012 9:04:03 AM 1 mg/L 1 3 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 5/2/2012 9:03:29 AM 100 mg/L 5 25700 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 5/2/2012 9:45:00 AM 2 mg/L 1.5 < 2 25 Finish Date/Time 5/2/2012 9:45:00 AM 0 mg/L 1.5 5/7/2012 09:05 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 5/2/2012 5:00:00 PM 1000 mg/L 200 13800 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 5/4/2012 3:57:00 AM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 5/4/2012 3:57:00 AM 0.02 mg/L 1 0.13 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 5/3/2012 12:27:16 PM 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 5/4/2012 5:13:00 AM 0.1 mg/L 1 < 0.1 0 Arsenic 5/4/2012 5:13:00 AM 0.02 mg/L 1 < 0.02 0 Beryllium 5/4/2012 5:13:00 AM 0.001 mg/L 1 < 0.001 0.8 Boron 5/4/2012 2:52:23 PM 2.50 mg/L 50 229 0 Cadmium 5/4/2012 5:13:00 AM 0.002 mg/L 1 < 0.002 0 Chromium 5/4/2012 5:13:00 AM 0.01 mg/L 1 < 0.01 0 Copper 5/4/2012 5:13:00 AM 0.01 mg/L 1 < 0.01 0.1 Iron 5/4/2012 5:13:00 AM 0.05 mg/L 1 < 0.05 0 Lead 5/4/2012 5:13:00 AM 0.02 mg/L 1 < 0.02 0.1 Manganese 5/4/2012 5:13:00 AM 0.01 mg/L 1 20.0 0 Nickel 5/4/2012 5:13:00 AM 0.01 mg/L 1 0.02 0 Selenium 5/4/2012 5:13:00 AM 0.02 mg/L 1 0.14 3.4 Silver 5/4/2012 5:13:00 AM 0.005 mg/L 1 < 0.005 0.1 Zinc 5/4/2012 5:13:00 AM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 5/8/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: AMS

Oil & Grease 5/3/2012 1:42:00 PM 5 mg/L 1.01 < 5 15

I.D. 56-00306 PA DEP

# Page 4 of 4 Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 5/1/2012 9:40:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1205064
Lab ID: G1205064-002

DF 

# Geochemical Testing Date: 09-May-12

Received Date: 5/1/2012 5:08:07 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 5/2/2012 9:03:29 AM 200 mg/L 10 34300 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 5/2/2012 9:04:06 AM 100 mg/L 20 21800 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 5/2/2012 9:45:00 AM 6 mg/L 6 38 0 Finish Date/Time 5/2/2012 9:45:00 AM 0 mg/L 6 5/7/2012 09:05 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 5/2/2012 5:00:00 PM 1000 mg/L 200 15000 0 

### INORGANIC METALS USGS I-1230-85 Analyst: SAG

Hexavalent Chromium 5/1/2012 6:00:00 PM 0.020 mg/L 1 < 0.020 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 5/4/2012 4:05:00 AM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 5/4/2012 4:05:00 AM 0.02 mg/L 1 0.29 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 5/3/2012 12:29:35 PM 0.10 mg/L 500 0.95 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 5/4/2012 11:09:19 PM 1.0 mg/L 1 471 0 Arsenic 5/4/2012 11:09:19 PM 0.20 mg/L 1 2.03 0 Beryllium 5/4/2012 11:09:19 PM 0.010 mg/L 1 0.056 0 Boron 5/7/2012 5:36:00 PM 5.00 mg/L 10 337 0 Cadmium 5/4/2012 11:09:19 PM 0.020 mg/L 1 0.023 0 Chromium 5/4/2012 11:09:19 PM 0.10 mg/L 1 2.17 0 Copper 5/4/2012 11:09:19 PM 0.10 mg/L 1 2.06 0 Iron 5/7/2012 5:36:00 PM 5.00 mg/L 10 2470 0 Lead 5/4/2012 11:09:19 PM 0.20 mg/L 1 0.68 0 Manganese 5/4/2012 11:09:19 PM 0.10 mg/L 1 289 0 Nickel 5/4/2012 11:09:19 PM 0.10 mg/L 1 4.21 0 Selenium 5/4/2012 11:09:19 PM 0.20 mg/L 1 4.17 0 Silver 5/4/2012 11:09:19 PM 0.050 mg/L 1 < 0.050 0 Zinc 5/4/2012 11:09:19 PM 0.10 mg/L 1 4.52 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 5/8/2012 0.02 mg/L 1 2.16 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: AMS

Oil & Grease 5/3/2012 1:42:00 PM 20 mg/L 4 < 20 0

I.D. 56-00306 PA DEP

# Thursday, May17, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 M(a) Order No.: G1205428 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 5/8/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 17-May-12 Date: 

# Geochemical Testing
Project: Keystone 611 M(a) CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1205428 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 M(a) Client Sample ID: Outfall 101

Collection Date: 5/8/2012 10:40:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1205428
Lab ID: G1205428-001

DF 

# Geochemical Testing Date: 17-May-12

Received Date: 5/8/2012 6:25:43 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 5/9/2012 8:46:28 AM 5 mg/L 1 < 5 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 5/9/2012 8:46:10 AM 100 mg/L 5 24400 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 5/9/2012 10:30:00 AM 2 mg/L 1.5 < 2 25 Finish Date/Time 5/9/2012 10:30:00 AM 0 mg/L 1.5 5/14/2012 10:05 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 5/9/2012 5:49:00 PM 1000 mg/L 200 14300 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 5/10/2012 10:02:34 P M 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 5/15/2012 1:14:00 AM 0.02 mg/L 1 0.13 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 5/10/2012 3:20:16 PM 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 5/10/2012 10:05:17 P M 0.1 mg/L 1 2.4 0 Arsenic 5/10/2012 10:05:17 P M 0.02 mg/L 1 < 0.02 0 Beryllium 5/10/2012 10:05:17 P M 0.001 mg/L 1 < 0.001 0.8 Boron 5/11/2012 4:13:25 PM 2.50 mg/L 50 266 0 Cadmium 5/10/2012 10:05:17 P M 0.002 mg/L 1 0.002 0 Chromium 5/10/2012 10:05:17 P M 0.01 mg/L 1 < 0.01 0 Copper 5/10/2012 10:05:17 P M 0.01 mg/L 1 < 0.01 0.1 Iron 5/10/2012 10:05:17 P M 0.05 mg/L 1 < 0.05 0 Lead 5/10/2012 10:05:17 P M 0.02 mg/L 1 < 0.02 0.1 Manganese 5/10/2012 10:05:17 P M 0.01 mg/L 1 13.0 0 Nickel 5/10/2012 10:05:17 P M 0.01 mg/L 1 < 0.01 0 Selenium 5/15/2012 1:23:00 AM 0.02 mg/L 1 0.13 3.4 Silver 5/15/2012 1:23:00 AM 0.005 mg/L 1 < 0.005 0.1 Zinc 5/10/2012 10:05:17 P M 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 5/15/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: AMS

Oil & Grease 5/9/2012 2:56:00 PM 5 mg/L 1 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 M(a) Client Sample ID: FGD Influent

Collection Date: 5/8/2012 10:30:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1205428
Lab ID: G1205428-002

DF 

# Geochemical Testing Date: 17-May-12

Received Date: 5/8/2012 6:25:43 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 5/9/2012 8:46:10 AM 200 mg/L 10 32300 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 5/9/2012 8:46:26 AM 100 mg/L 20 11500 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 5/9/2012 10:30:00 AM 3 mg/L 3 29 0 Finish Date/Time 5/9/2012 10:30:00 AM 0 mg/L 3 5/14/2012 10:05 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 5/9/2012 5:49:00 PM 1000 mg/L 200 17800 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 5/15/2012 6:25:15 PM 0.25 mg/L 5 < 0.25 0 Selenium, dissolved 5/15/2012 6:25:15 PM 0.10 mg/L 5 0.41 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 5/10/2012 3:22:30 PM 0.10 mg/L 500 0.40 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 5/12/2012 12:55:07 A M 1.0 mg/L 1 162 0 Arsenic 5/12/2012 12:55:07 A M 0.20 mg/L 1 1.09 0 Beryllium 5/12/2012 12:55:07 A M 0.010 mg/L 1 0.025 0 Boron 5/14/2012 11:07:00 P M 5.00 mg/L 10 375 0 Cadmium 5/12/2012 12:55:07 A M 0.020 mg/L 1 0.036 0 Chromium 5/12/2012 12:55:07 A M 0.10 mg/L 1 1.01 0 Copper 5/12/2012 12:55:07 A M 0.10 mg/L 1 0.97 0 Iron 5/12/2012 12:55:07 A M 0.50 mg/L 1 1040 0 Lead 5/12/2012 12:55:07 A M 0.20 mg/L 1 0.32 0 Manganese 5/12/2012 12:55:07 A M 0.10 mg/L 1 331 0 Nickel 5/12/2012 12:55:07 A M 0.10 mg/L 1 2.81 0 Selenium 5/12/2012 12:55:07 A M 0.20 mg/L 1 2.25 0 Silver 5/12/2012 12:55:07 A M 0.050 mg/L 1 < 0.050 0 Zinc 5/12/2012 12:55:07 A M 0.10 mg/L 1 2.09 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 5/15/2012 0.02 mg/L 1 0.96 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: AMS

Oil & Grease 5/10/2012 12:57:00 P M 20 mg/L 4 < 20 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Thursday, May24, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1205714 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 5/15/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 24-May-12 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1205714 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 5/15/2012 10:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1205714
Lab ID: G1205714-001

DF 

# Geochemical Testing Date: 24-May-12

Received Date: 5/15/2012 5:50:42 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 5/16/2012 2:47:47 PM 1 mg/L 1 6 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 5/16/2012 2:54:09 PM 100 mg/L 5 27700 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 5/16/2012 7:50:00 AM 2 mg/L 1.5 < 2 25 Finish Date/Time 5/16/2012 7:50:00 AM 0 mg/L 1.5 5/21/2012 08:30 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 5/16/2012 11:15:00 A M 1000 mg/L 200 14700 0 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Iron, dissolved 5/17/2012 9:06:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 5/17/2012 9:06:00 PM 0.02 mg/L 1 0.11 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 5/17/2012 12:55:37 P M 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 5/18/2012 5:15:00 PM 0.2 mg/L 2 < 0.2 0 Arsenic 5/18/2012 5:15:00 PM 0.04 mg/L 2 < 0.04 0 Beryllium 5/18/2012 5:15:00 PM 0.002 mg/L 2 < 0.002 0.8 Boron 5/18/2012 1:57:00 PM 2.50 mg/L 50 266 0 Cadmium 5/17/2012 9:14:00 PM 0.002 mg/L 1 0.002 0 Chromium 5/18/2012 5:15:00 PM 0.02 mg/L 2 < 0.02 0 Copper 5/17/2012 9:14:00 PM 0.01 mg/L 1 < 0.01 0.1 Iron 5/17/2012 9:14:00 PM 0.05 mg/L 1 < 0.05 0 Lead 5/22/2012 5:29:08 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 5/17/2012 9:14:00 PM 0.01 mg/L 1 19.1 0 Nickel 5/17/2012 9:14:00 PM 0.01 mg/L 1 0.01 0 Selenium 5/17/2012 9:14:00 PM 0.02 mg/L 1 0.11 3.4 Silver 5/17/2012 9:14:00 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 5/17/2012 9:14:00 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 5/21/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: AMS

Oil & Grease 5/17/2012 3:09:00 PM 5 mg/L 1.02 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 5/15/2012 10:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1205714
Lab ID: G1205714-002

DF 

# Geochemical Testing Date: 24-May-12

Received Date: 5/15/2012 5:50:42 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 5/16/2012 2:54:10 PM 200 mg/L 10 36700 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 5/16/2012 2:47:48 PM 100 mg/L 20 9560 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 5/16/2012 9:00:00 AM 3 mg/L 3 25 0 Finish Date/Time 5/16/2012 9:00:00 AM 0 mg/L 3 5/21/2012 10:00 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 5/16/2012 11:15:00 A M 1000 mg/L 200 17300 0 

### INORGANIC METALS USGS I-1230-85 Analyst: KMW

Hexavalent Chromium 5/15/2012 6:50:00 PM 0.020 mg/L 1 0.057 0 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Iron, dissolved 5/17/2012 9:22:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 5/17/2012 9:22:00 PM 0.02 mg/L 1 0.58 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 5/17/2012 12:57:46 P M 0.10 mg/L 500 0.25 0 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Aluminum 5/18/2012 5:26:00 AM 1.0 mg/L 1 150 0 Arsenic 5/18/2012 5:26:00 AM 0.20 mg/L 1 1.07 0 Beryllium 5/18/2012 5:26:00 AM 0.010 mg/L 1 0.022 0 Boron 5/18/2012 2:55:00 PM 5.00 mg/L 10 358 0 Cadmium 5/18/2012 5:26:00 AM 0.020 mg/L 1 0.069 0 Chromium 5/18/2012 5:26:00 AM 0.10 mg/L 1 0.80 0 Copper 5/18/2012 5:26:00 AM 0.10 mg/L 1 0.52 0 Iron 5/18/2012 5:26:00 AM 0.50 mg/L 1 870 0 Lead 5/18/2012 5:26:00 AM 0.20 mg/L 1 0.41 0 Manganese 5/18/2012 5:26:00 AM 0.10 mg/L 1 329 0 Nickel 5/18/2012 5:26:00 AM 0.10 mg/L 1 2.89 0 Selenium 5/18/2012 5:26:00 AM 0.20 mg/L 1 2.31 0 Silver 5/18/2012 5:26:00 AM 0.050 mg/L 1 < 0.050 0 Zinc 5/18/2012 5:26:00 AM 0.10 mg/L 1 1.96 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 5/21/2012 0.02 mg/L 1 0.74 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: AMS

Oil & Grease 5/17/2012 3:16:00 PM 19 mg/L 3.7 < 19 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Tuesday, June 05, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1205B20 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 5/23/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 05-Jun-12 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1205B20 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 5/23/2012 12:45:00 PM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1205B20
Lab ID: G1205B20-001

DF 

# Geochemical Testing Date: 05-Jun-12

Received Date: 5/23/2012 7:13:00 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 5/25/2012 3:46:40 PM 1 mg/L 1.25 4 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 5/24/2012 7:20:19 AM 100 mg/L 5 26000 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 5/24/2012 10:45:00 A M 2 mg/L 1.5 < 2 25 Finish Date/Time 5/24/2012 10:45:00 A M 0 mg/L 1.5 5/29/2012 10:05 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 5/29/2012 4:36:00 PM 1000 mg/L 200 14300 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 5/30/2012 1:52:00 AM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 5/25/2012 5:46:54 PM 0.02 mg/L 1 0.14 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 5/24/2012 3:52:45 PM 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 5/29/2012 3:24:00 PM 1.0 mg/L 10 < 1.0 0 Arsenic 5/25/2012 5:49:32 PM 0.02 mg/L 1 < 0.02 0 Beryllium 5/25/2012 5:49:32 PM 0.001 mg/L 1 < 0.001 0.8 Boron 5/29/2012 3:20:00 PM 2.50 mg/L 50 250 0 Cadmium 5/25/2012 5:49:32 PM 0.002 mg/L 1 0.003 0 Chromium 5/25/2012 5:49:32 PM 0.01 mg/L 1 < 0.01 0 Copper 5/25/2012 5:49:32 PM 0.01 mg/L 1 0.01 0.1 Iron 5/25/2012 5:49:32 PM 0.05 mg/L 1 < 0.05 0 Lead 5/30/2012 2:00:00 AM 0.02 mg/L 1 < 0.02 0.1 Manganese 5/25/2012 5:49:32 PM 0.01 mg/L 1 16.9 0 Nickel 5/25/2012 5:49:32 PM 0.01 mg/L 1 < 0.01 0 Selenium 5/25/2012 5:49:32 PM 0.02 mg/L 1 0.14 3.4 Silver 5/25/2012 5:49:32 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 5/30/2012 2:00:00 AM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 6/1/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 5/31/2012 9:33:00 AM 5 mg/L 1.06 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 5/23/2012 12:30:00 PM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1205B20
Lab ID: G1205B20-002

DF 

# Geochemical Testing Date: 05-Jun-12

Received Date: 5/23/2012 7:13:00 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 5/24/2012 7:20:19 AM 200 mg/L 10 31000 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 5/24/2012 7:20:33 AM 100 mg/L 20 21500 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 5/24/2012 10:45:00 A M 3 mg/L 3 20 0 Finish Date/Time 5/24/2012 10:45:00 A M 0 mg/L 3 5/29/2012 10:05 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 5/29/2012 4:36:00 PM 1000 mg/L 200 16700 0 

### INORGANIC METALS USGS I-1230-85 Analyst: MLS

Hexavalent Chromium 5/23/2012 7:50:00 PM 0.020 mg/L 1 0.024 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 5/31/2012 9:45:00 AM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 5/31/2012 9:45:00 AM 0.02 mg/L 1 0.05 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 5/24/2012 3:55:01 PM 0.10 mg/L 500 0.64 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 5/30/2012 2:44:00 PM 1.0 mg/L 1 338 0 Arsenic 5/30/2012 2:44:00 PM 0.20 mg/L 1 2.19 0 Beryllium 5/30/2012 2:44:00 PM 0.010 mg/L 1 0.061 0 Boron 5/30/2012 5:36:00 PM 5.00 mg/L 10 374 0 Cadmium 5/30/2012 2:44:00 PM 0.020 mg/L 1 0.146 0 Chromium 5/30/2012 2:44:00 PM 0.10 mg/L 1 1.94 0 Copper 5/30/2012 2:44:00 PM 0.10 mg/L 1 1.40 0 Iron 5/30/2012 2:44:00 PM 0.50 mg/L 1 1960 0 Lead 5/30/2012 2:44:00 PM 0.20 mg/L 1 0.87 0 Manganese 5/30/2012 2:44:00 PM 0.10 mg/L 1 340 0 Nickel 5/30/2012 2:44:00 PM 0.10 mg/L 1 4.45 0 Selenium 5/30/2012 2:44:00 PM 0.20 mg/L 1 4.04 0 Silver 5/30/2012 2:44:00 PM 0.050 mg/L 1 < 0.050 0 Zinc 5/30/2012 2:44:00 PM 0.10 mg/L 1 4.24 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 6/1/2012 0.02 mg/L 1 1.92 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 5/31/2012 9:30:00 AM 19 mg/L 3.85 < 19 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Wednesday, June 20, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1205C70 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 5/29/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 20-Jun-12 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1205C70 

# CASE NARRATIVE

REVISED REPORT: Aluminum and lead analyzed by EPA 200.8. No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 5/29/2012 9:45:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1205C70
Lab ID: G1205C70-001

DF 

# Geochemical Testing Date: 20-Jun-12

Received Date: 5/29/2012 5:39:48 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 5/30/2012 11:30:29 A M 1 mg/L 1 < 1 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 5/30/2012 11:30:14 A M 100 mg/L 5 29400 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 5/30/2012 8:15:00 AM 2 mg/L 1.5 < 2 25 Finish Date/Time 5/30/2012 8:15:00 AM 0 mg/L 1.5 6/4/2012 07:20 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: MLS

Chloride 5/30/2012 1:08:00 PM 1000 mg/L 200 14700 0 

### INORGANIC METALS EPA 200.8 Analyst: JEK

Aluminum 6/19/2012 11:24:00 A M 0.050 mg/L 10 < 0.050 0.1 Lead 6/19/2012 11:18:00 A M 0.005 mg/L 5 < 0.005 0.1 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 5/31/2012 8:44:00 AM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 5/31/2012 8:44:00 AM 0.02 mg/L 1 0.12 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 6/4/2012 8:38:58 AM 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Arsenic 5/31/2012 3:01:00 AM 0.02 mg/L 1 < 0.02 0 Beryllium 5/31/2012 3:01:00 AM 0.001 mg/L 1 < 0.001 0.8 Boron 5/31/2012 4:15:00 PM 2.50 mg/L 50 284 0 Cadmium 5/31/2012 3:01:00 AM 0.002 mg/L 1 0.003 0 Chromium 5/31/2012 3:01:00 AM 0.01 mg/L 1 < 0.01 0 Copper 5/31/2012 3:01:00 AM 0.01 mg/L 1 < 0.01 0.1 Iron 5/31/2012 3:01:00 AM 0.05 mg/L 1 < 0.05 0 Manganese 5/31/2012 3:01:00 AM 0.01 mg/L 1 15.3 0 Nickel 5/31/2012 3:01:00 AM 0.01 mg/L 1 < 0.01 0 Selenium 5/31/2012 3:01:00 AM 0.02 mg/L 1 0.12 3.4 Silver 5/31/2012 3:01:00 AM 0.005 mg/L 1 < 0.005 0.1 Zinc 5/31/2012 3:01:00 AM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 6/1/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: AMS

Oil & Grease S 6/5/2012 11:19:00 AM 5 mg/L 1 < 5 15 NOTES: S - Spike recovery indicates a possible matrix effect. The method is in control as indicated by the LCS.

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 5/29/2012 9:30:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1205C70
Lab ID: G1205C70-002

DF 

# Geochemical Testing Date: 20-Jun-12

Received Date: 5/29/2012 5:39:48 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 5/30/2012 11:30:14 A M 200 mg/L 10 32000 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 5/30/2012 11:30:29 A M 100 mg/L 20 33500 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 5/30/2012 8:15:00 AM 6 mg/L 6 26 0 Finish Date/Time 5/30/2012 8:15:00 AM 0 mg/L 6 6/4/2012 07:20 

### INORGANIC NON-METALS SM 4500-CL E Analyst: MLS

Chloride 5/30/2012 1:08:00 PM 1000 mg/L 200 16600 0 

### INORGANIC METALS USGS I-1230-85 Analyst: MLR

Hexavalent Chromium 5/29/2012 6:37:00 PM 0.020 mg/L 1 0.060 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 5/31/2012 8:54:00 AM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 5/31/2012 8:54:00 AM 0.02 mg/L 1 0.43 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 6/4/2012 8:45:52 AM 0.10 mg/L 500 0.82 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 6/8/2012 7:37:00 PM 1.0 mg/L 1 568 0 Arsenic 6/7/2012 8:24:00 AM 0.20 mg/L 1 3.53 0 Beryllium 6/7/2012 8:24:00 AM 0.010 mg/L 1 0.084 0 Boron 6/8/2012 7:04:00 PM 5.00 mg/L 10 428 0 Cadmium 6/7/2012 8:24:00 AM 0.020 mg/L 1 0.207 0 Chromium 6/7/2012 8:24:00 AM 0.10 mg/L 1 3.04 0 Copper 6/7/2012 8:24:00 AM 0.10 mg/L 1 1.89 0 Iron 6/8/2012 7:04:00 PM 5.00 mg/L 10 2820 0 Lead 6/7/2012 8:24:00 AM 0.20 mg/L 1 1.22 0 Manganese 6/7/2012 8:24:00 AM 0.10 mg/L 1 369 0 Nickel 6/7/2012 8:24:00 AM 0.10 mg/L 1 5.50 0 Selenium 6/7/2012 8:24:00 AM 0.20 mg/L 1 5.23 0 Silver 6/8/2012 7:37:00 PM 0.050 mg/L 1 < 0.050 0 Zinc 6/7/2012 8:24:00 AM 0.10 mg/L 1 6.49 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 6/11/2012 0.02 mg/L 1 2.98 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: AMS

Oil & Grease 6/5/2012 11:17:00 AM 19 mg/L 3.85 < 19 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Wednesday, June 20, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 M(a) Order No.: G1206154 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 6/5/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 20-Jun-12 Date: 

# Geochemical Testing
Project: Keystone 611 M(a) CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1206154 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 M(a) Client Sample ID: Outfall 101

Collection Date: 6/5/2012 10:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1206154
Lab ID: G1206154-001

DF 

# Geochemical Testing Date: 20-Jun-12

Received Date: 6/5/2012 7:20:23 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 6/6/2012 9:49:49 AM 5 mg/L 1 < 5 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 6/6/2012 12:12:14 PM 100 mg/L 5 28500 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 6/6/2012 11:00:00 AM 2 mg/L 1.5 < 2 25 Finish Date/Time 6/6/2012 11:00:00 AM 0 mg/L 1.5 6/11/2012 10:10 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 6/8/2012 7:34:00 PM 1000 mg/L 200 14800 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 6/7/2012 5:33:30 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 6/7/2012 5:33:30 PM 0.02 mg/L 1 0.10 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 6/7/2012 11:14:07 AM 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: MS

Aluminum 6/11/2012 1:53:00 PM 0.1 mg/L 1 6.0 0 Arsenic 6/11/2012 1:53:00 PM 0.02 mg/L 1 < 0.02 0 Beryllium 6/11/2012 1:53:00 PM 0.001 mg/L 1 < 0.001 0.8 Boron 6/11/2012 1:53:00 PM 0.05 mg/L 1 301 0 Cadmium 6/18/2012 5:49:00 PM 0.002 mg/L 1 0.003 0 Chromium 6/18/2012 5:49:00 PM 0.01 mg/L 1 < 0.01 0 Copper 6/18/2012 5:49:00 PM 0.01 mg/L 1 < 0.01 0.1 Iron 6/18/2012 5:49:00 PM 0.05 mg/L 1 < 0.05 0 Lead 6/18/2012 5:49:00 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 6/18/2012 5:49:00 PM 0.01 mg/L 1 17.9 0 Nickel 6/18/2012 5:49:00 PM 0.01 mg/L 1 0.01 0 Selenium 6/18/2012 5:49:00 PM 0.02 mg/L 1 0.11 3.4 Silver 6/11/2012 1:53:00 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 6/18/2012 5:49:00 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 6/19/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: AMS

Oil & Grease 6/8/2012 6:33:00 PM 5 mg/L 1.04 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 M(a) Client Sample ID: FGD Influent

Collection Date: 6/5/2012 10:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1206154
Lab ID: G1206154-002

DF 

# Geochemical Testing Date: 20-Jun-12

Received Date: 6/5/2012 7:20:23 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 6/6/2012 12:12:14 PM 200 mg/L 10 34300 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 6/6/2012 9:50:05 AM 5 mg/L 1 1230 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 6/6/2012 11:00:00 AM 6 mg/L 6 25 0 Finish Date/Time 6/6/2012 11:00:00 AM 0 mg/L 6 6/11/2012 10:10 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 6/8/2012 7:34:00 PM 1000 mg/L 200 17400 0 

### INORGANIC METALS EPA 200.7 Analyst: MS

Iron, dissolved 6/12/2012 3:32:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 6/12/2012 3:32:00 PM 0.02 mg/L 1 0.56 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 6/7/2012 11:16:24 AM 0.10 mg/L 500 0.64 0 

### INORGANIC METALS EPA 200.7 Analyst: MS

Aluminum 6/12/2012 6:45:00 AM 1.0 mg/L 1 390 0 Arsenic 6/12/2012 6:45:00 AM 0.20 mg/L 1 2.82 0 Beryllium 6/12/2012 6:45:00 AM 0.010 mg/L 1 0.071 0 Boron 6/12/2012 9:23:00 PM 5.00 mg/L 10 408 0 Cadmium 6/12/2012 6:45:00 AM 0.020 mg/L 1 0.156 0 Chromium 6/12/2012 6:45:00 AM 0.10 mg/L 1 2.26 0 Copper 6/12/2012 6:45:00 AM 0.10 mg/L 1 1.55 0 Iron 6/12/2012 9:23:00 PM 5.00 mg/L 10 2380 0 Lead 6/12/2012 6:45:00 AM 0.20 mg/L 1 1.08 0 Manganese 6/12/2012 6:45:00 AM 0.10 mg/L 1 360 0 Nickel 6/12/2012 6:45:00 AM 0.10 mg/L 1 4.97 0 Selenium 6/12/2012 6:45:00 AM 0.20 mg/L 1 4.59 0 Silver 6/12/2012 6:45:00 AM 0.050 mg/L 1 < 0.050 0 Zinc 6/12/2012 6:45:00 AM 0.10 mg/L 1 5.59 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 6/14/2012 0.02 mg/L 1 2.25 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: AMS

Oil & Grease 6/8/2012 6:46:00 PM 19 mg/L 3.85 < 19 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Thursday, July05, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 M(b) Order No.: G1206457 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 6/12/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 05-Jul-12 Date: 

# Geochemical Testing
Project: Keystone 611 M(b) CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1206457 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 M(b) Client Sample ID: Outfall 101

Collection Date: 6/12/2012 10:45:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1206457
Lab ID: G1206457-001

DF 

# Geochemical Testing Date: 05-Jul-12

Received Date: 6/12/2012 6:49:07 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 6/13/2012 11:44:43 A M 5 mg/L 1 < 5 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 6/13/2012 11:44:28 A M 100 mg/L 5 28500 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 6/13/2012 8:15:00 AM 2 mg/L 1.5 < 2 25 Finish Date/Time 6/13/2012 8:15:00 AM 0 mg/L 1.5 6/18/2012 09:15 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 6/13/2012 4:10:00 PM 1000 mg/L 200 15300 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 6/18/2012 5:33:59 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 6/18/2012 5:33:59 PM 0.02 mg/L 1 0.13 0 

### INORGANIC METALS SM 3112B Analyst: MBG

Mercury 6/14/2012 12:00:39 P M 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 6/21/2012 12:10:00 A M 0.1 mg/L 1 < 0.1 0 Arsenic 6/18/2012 5:31:24 PM 0.02 mg/L 1 < 0.02 0 Beryllium 6/18/2012 5:31:24 PM 0.001 mg/L 1 < 0.001 0.8 Boron 6/19/2012 12:30:00 P M 2.50 mg/L 50 261 0 Cadmium 6/18/2012 5:31:24 PM 0.002 mg/L 1 < 0.002 0 Chromium 6/18/2012 5:31:24 PM 0.01 mg/L 1 < 0.01 0 Copper 6/18/2012 5:31:24 PM 0.01 mg/L 1 < 0.01 0.1 Iron 6/18/2012 5:31:24 PM 0.05 mg/L 1 < 0.05 0 Lead 6/18/2012 5:31:24 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 6/18/2012 5:31:24 PM 0.01 mg/L 1 12.7 0 Nickel 6/18/2012 5:31:24 PM 0.01 mg/L 1 < 0.01 0 Selenium 6/18/2012 5:31:24 PM 0.02 mg/L 1 0.12 3.4 Silver 6/18/2012 5:31:24 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 6/18/2012 5:31:24 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 6/19/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: AMS

Oil & Grease 6/14/2012 3:56:00 PM 5 mg/L 1.09 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 M(b) Client Sample ID: FGD Influent

Collection Date: 6/12/2012 10:30:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1206457
Lab ID: G1206457-002

DF 

# Geochemical Testing Date: 05-Jul-12

Received Date: 6/12/2012 6:49:07 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 6/13/2012 11:44:28 A M 200 mg/L 10 36500 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 6/13/2012 11:44:49 A M 100 mg/L 20 21700 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 6/13/2012 8:15:00 AM 6 mg/L 6 38 0 Finish Date/Time 6/13/2012 8:15:00 AM 0 mg/L 6 6/18/2012 09:15 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 6/13/2012 4:10:00 PM 1000 mg/L 200 17600 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 6/18/2012 7:40:35 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 6/18/2012 7:40:35 PM 0.02 mg/L 1 0.39 0 

### INORGANIC METALS SM 3112B Analyst: MBG

Mercury 6/14/2012 12:02:48 P M 0.10 mg/L 500 0.73 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 6/18/2012 7:35:25 PM 1.0 mg/L 1 427 0 Arsenic 6/18/2012 7:35:25 PM 0.20 mg/L 1 3.29 0 Beryllium 6/18/2012 7:35:25 PM 0.010 mg/L 1 0.072 0 Boron 6/19/2012 1:28:00 PM 5.00 mg/L 10 360 0 Cadmium 6/18/2012 7:35:25 PM 0.020 mg/L 1 0.052 0 Chromium 6/18/2012 7:35:25 PM 0.10 mg/L 1 2.12 0 Copper 6/18/2012 7:35:25 PM 0.10 mg/L 1 2.02 0 Iron 6/18/2012 7:35:25 PM 0.50 mg/L 1 2120 0 Lead 6/18/2012 7:35:25 PM 0.20 mg/L 1 0.87 0 Manganese 6/18/2012 7:35:25 PM 0.10 mg/L 1 330 0 Nickel 6/18/2012 7:35:25 PM 0.10 mg/L 1 4.04 0 Selenium 6/18/2012 7:35:25 PM 0.20 mg/L 1 5.30 0 Silver 6/18/2012 7:35:25 PM 0.050 mg/L 1 < 0.050 0 Zinc 6/18/2012 7:35:25 PM 0.10 mg/L 1 4.91 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 6/19/2012 0.02 mg/L 1 2.10 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: AMS

Oil & Grease 6/15/2012 8:41:00 AM 19 mg/L 3.85 < 19 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

## No problems were encountered during analysis of this workorder, except if noted in this report. 2005 N. Center Ave. Somerset PA 15501 814-443-1671 814-445-6666 FAX:814-445-6729 

### Client: GenOn ENERGY INC. - KEYSTONE STATION 

# CASE NARRATIVE Project: Keystone 611 W Lab Order: G1206838

Legend: ND - Not Detected at the Quantitation Limit S - Spike Recovery outside accepted recovery limits J - Indicates an estimated value R - RPD outside accepted recovery limits U - The analyte was not detected at or above the listed E - Value above quantitation range concentration, which is below the laboratory quantitation limit ** - Value exceeds Action Limit B - Analyte detected in the associated Method Blank H - Method Hold Time Exceeded Q - Qualifier QL - Quantitation Limit DF - Dilution Factor MCL - Contaminant Limit 

## Page 1 of 5

### Physical Tests SM 2540D Analyst: KLS

Total suspended solids < 1 1 mg/L 1.25 06/21/2012 08:59 Inorganic Non-Metals SM 2540 C Analyst: KLS Total dissolved solids 28900 20 mg/L 1 06/21/2012 09:10 Indicator Organic Parameters SM 5210 B Analyst: MMR BOD 5-day < 2 2 mg/L 1.5 06/21/2012 11:45 Finish Date/Time 6/26/2012 11:10 0 mg/L 1.5 06/21/2012 11:45
Inorganic Non-Metals SM 4500-CL E Analyst: SAG Chloride 15000 1000 mg/L 200 06/21/2012 16:07 Inorganic Metals USGS I-1230-85 Analyst: SEM Hexavalent Chromium < 0.0050 0.0050 mg/L 1 06/20/2012 19:18 Inorganic Metals EPA 200.7 Analyst: MBG Iron, dissolved < 0.05 0.05 mg/L 1 06/23/2012 20:20 Selenium, dissolved 0.11 0.02 mg/L 1 06/21/2012 18:53 Inorganic Metals SM 3112B Analyst: JEK Mercury < 0.0002 0.0002 mg/L 1 06/22/2012 08:16 Inorganic Metals EPA 200.7 Analyst: MBG Aluminum < 0.1 0.1 mg/L 1 06/21/2012 18:51 Arsenic < 0.02 0.02 mg/L 1 06/21/2012 18:51 Beryllium < 0.001 0.001 mg/L 1 06/21/2012 18:51 Boron 248 2.50 mg/L 50 06/22/2012 17:43 Cadmium 0.003 0.002 mg/L 1 06/21/2012 18:51 Chromium < 0.01 0.01 mg/L 1 06/21/2012 18:51 Copper 0.01 0.01 mg/L 1 06/21/2012 18:51 Iron < 0.05 0.05 mg/L 1 06/23/2012 19:31



# Laboratory Results

2005 N. Center Ave. Somerset PA 15501 814-443-1671 814-445-6666 FAX:814-445-6729 

### Client: GenOn ENERGY INC. - KEYSTONE STATION Client Sample ID: Outfall 101 Lab Order: G1206838 Project: Keystone 611 W Sampled By: Client Lab ID: G1206838-001 Collection Date: 06/20/2012 10:05 Matrix: Aqueous Received Date: 06/20/2012 18:14 Analyses Result QL Q Units DF Date Analyzed



## Page 2 of 5

### Lead < 0.02 0.02 mg/L 1 06/21/2012 18:51

Manganese 12.1 0.01 mg/L 1 06/23/2012 19:31 Nickel 0.01 0.01 mg/L 1 06/23/2012 19:31 Selenium 0.10 0.02 mg/L 1 06/21/2012 18:51 Silver < 0.005 0.005 mg/L 1 06/21/2012 18:51 Zinc < 0.01 0.01 mg/L 1 06/23/2012 19:31
Trivalent Chromium EPA 200.7/I-1230-85 Analyst: LAN Trivalent Chromium < 0.02 0.02 mg/L 1 06/26/2012 00:00 Indicator Organic Parameters EPA 1664 Analyst: AMS Oil & Grease < 5 5 mg/L 1.01 06/22/2012 15:32



# Laboratory Results

2005 N. Center Ave. Somerset PA 15501 814-443-1671 814-445-6666 FAX:814-445-6729 

### Client: GenOn ENERGY INC. - KEYSTONE STATION Client Sample ID: Outfall 101 Lab Order: G1206838 Project: Keystone 611 W Sampled By: Client Lab ID: G1206838-001 Collection Date: 06/20/2012 10:05 Matrix: Aqueous Received Date: 06/20/2012 18:14 Analyses Result QL Q Units DF Date Analyzed



## Page 3 of 5

### Inorganic Non-Metals SM 2540 C Analyst: KLS

Total dissolved solids 33700 100 mg/L 5 06/21/2012 09:10 Physical Tests SM 2540D Analyst: KLS Total suspended solids 11800 100 H mg/L 20 06/28/2012 15:48 Indicator Organic Parameters SM 5210 B Analyst: MMR BOD 5-day 17 3 mg/L 3 06/21/2012 11:45 Finish Date/Time 6/26/2012 11:10 0 mg/L 3 06/21/2012 11:45
Inorganic Non-Metals SM 4500-CL E Analyst: SAG Chloride 16500 1000 mg/L 200 06/21/2012 16:07 Inorganic Metals USGS I-1230-85 Analyst: SEM Hexavalent Chromium < 0.0050 0.0050 mg/L 1 06/20/2012 19:18 Inorganic Metals EPA 200.7 Analyst: MBG Iron, dissolved < 0.05 0.05 mg/L 1 06/23/2012 21:09 Selenium, dissolved 1.06 0.02 mg/L 1 06/21/2012 18:56 Inorganic Metals SM 3112B Analyst: JEK Mercury 0.54 0.10 mg/L 500 06/22/2012 08:18 Inorganic Metals EPA 200.7 Analyst: MBG Aluminum 169 1.0 mg/L 1 06/24/2012 00:37 Arsenic 1.40 0.20 mg/L 1 06/21/2012 20:42 Beryllium 0.034 0.010 mg/L 1 06/27/2012 02:05 Boron 427 5.00 mg/L 10 06/28/2012 20:18 Cadmium 0.091 0.020 mg/L 1 06/24/2012 00:37 Chromium 1.24 0.10 mg/L 1 06/21/2012 20:42 Copper 0.78 0.10 mg/L 1 06/24/2012 00:37 Iron 1180 0.50 mg/L 1 06/27/2012 02:05



# Laboratory Results

2005 N. Center Ave. Somerset PA 15501 814-443-1671 814-445-6666 FAX:814-445-6729 

### Client: GenOn ENERGY INC. - KEYSTONE STATION Client Sample ID: FGD Influent Lab Order: G1206838 IWT Influent Special Project: Keystone 611 W Sampled By: Client Lab ID: G1206838-002 Collection Date: 06/20/2012 09:50 Matrix: Aqueous Received Date: 06/20/2012 18:14 Analyses Result QL Q Units DF Date Analyzed



## Page 4 of 5

### Lead 0.51 0.20 mg/L 1 06/24/2012 00:37

Manganese 350 0.10 mg/L 1 06/27/2012 02:05 Nickel 2.88 0.10 mg/L 1 06/24/2012 00:37 Selenium 3.31 0.20 mg/L 1 06/24/2012 00:37 Silver < 0.050 0.050 mg/L 1 06/24/2012 00:37 Zinc 2.86 0.10 mg/L 1 06/21/2012 20:42
Trivalent Chromium EPA 200.7/I-1230-85 Analyst: LAN Trivalent Chromium 1.24 0.02 mg/L 1 06/26/2012 00:00 Indicator Organic Parameters EPA 1664 Analyst: AMS Oil & Grease < 19 19 mg/L 3.85 06/22/2012 15:28 NOTES: The pH of the sample was >2. 

# Laboratory Results

2005 N. Center Ave. Somerset PA 15501 814-443-1671 814-445-6666 FAX:814-445-6729 

### Client: GenOn ENERGY INC. - KEYSTONE STATION Client Sample ID: FGD Influent Lab Order: G1206838 IWT Influent Special Project: Keystone 611 W Sampled By: Client Lab ID: G1206838-002 Collection Date: 06/20/2012 09:50 Matrix: Aqueous Received Date: 06/20/2012 18:14 Analyses Result QL Q Units DF Date Analyzed



## Page 5 of 5

# Monday, July09, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1206A45 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 6/26/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 09-Jul-12 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1206A45 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 6/26/2012 10:30:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1206A45
Lab ID: G1206A45-001

DF 

# Geochemical Testing Date: 09-Jul-12

Received Date: 6/26/2012 6:30:28 PM 

# Laboratory Results

Sampled By : Water Lab

MCL
PHYSICAL TESTS SM 2540D Analyst: GMG

Total suspended solids 6/27/2012 2:17:49 PM 1 mg/L 1 2 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 6/29/2012 8:15:23 AM 100 mg/L 5 31700 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 6/27/2012 8:25:00 AM 2 mg/L 1.5 2 25 Finish Date/Time 6/27/2012 8:25:00 AM 0 mg/L 1.5 7/2/2012 08:45 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SEM

Chloride 6/27/2012 2:31:00 PM 1000 mg/L 200 13600 0 

### INORGANIC METALS EPA 200.7 Analyst: MS

Iron, dissolved 6/28/2012 7:11:00 AM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 6/28/2012 7:11:00 AM 0.02 mg/L 1 0.13 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 6/28/2012 11:36:12 A M 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: MS

Aluminum 6/28/2012 6:47:00 AM 0.1 mg/L 1 < 0.1 0 Arsenic 6/28/2012 6:47:00 AM 0.02 mg/L 1 < 0.02 0 Beryllium 6/28/2012 6:47:00 AM 0.001 mg/L 1 < 0.001 0.8 Boron 6/29/2012 3:07:00 PM 2.50 mg/L 50 273 0 Cadmium 6/28/2012 6:47:00 AM 0.002 mg/L 1 < 0.002 0 Chromium 6/28/2012 6:47:00 AM 0.01 mg/L 1 < 0.01 0 Copper 6/28/2012 6:47:00 AM 0.01 mg/L 1 < 0.01 0.1 Iron 6/28/2012 6:47:00 AM 0.05 mg/L 1 < 0.05 0 Lead 6/28/2012 6:47:00 AM 0.02 mg/L 1 < 0.02 0.1 Manganese 6/28/2012 6:47:00 AM 0.01 mg/L 1 16.1 0 Nickel 6/28/2012 6:47:00 AM 0.01 mg/L 1 < 0.01 0 Selenium 6/28/2012 6:47:00 AM 0.02 mg/L 1 0.13 3.4 Silver 6/28/2012 6:47:00 AM 0.005 mg/L 1 < 0.005 0.1 Zinc 6/28/2012 6:47:00 AM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 7/3/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: AMS

Oil & Grease 6/27/2012 2:20:00 PM 5 mg/L 1.02 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 6/26/2012 10:20:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1206A45
Lab ID: G1206A45-002

DF 

# Geochemical Testing Date: 09-Jul-12

Received Date: 6/26/2012 6:30:28 PM 

# Laboratory Results

Sampled By : Water Lab IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 6/29/2012 8:15:23 AM 200 mg/L 10 40300 0 

### PHYSICAL TESTS SM 2540D Analyst: GMG

Total suspended solids 6/27/2012 2:17:47 PM 100 mg/L 20 4300 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 6/27/2012 8:25:00 AM 3 mg/L 3 18 0 Finish Date/Time 6/27/2012 8:25:00 AM 0 mg/L 3 7/2/2012 08:45 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SEM

Chloride 6/27/2012 2:31:00 PM 1000 mg/L 200 14300 0 

### INORGANIC METALS USGS I-1230-85 Analyst: MLR

Hexavalent Chromium 6/26/2012 7:00:00 PM 0.020 mg/L 1 < 0.020 0 

### INORGANIC METALS EPA 200.7 Analyst: MS

Iron, dissolved 6/28/2012 7:25:00 AM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 6/28/2012 7:25:00 AM 0.02 mg/L 1 0.47 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 6/28/2012 11:38:25 A M 0.10 mg/L 500 0.14 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 7/3/2012 5:13:00 AM 1.0 mg/L 1 67.4 0 Arsenic 7/3/2012 5:13:00 AM 0.20 mg/L 1 0.54 0 Beryllium 7/3/2012 5:13:00 AM 0.010 mg/L 1 0.010 0 Boron 7/3/2012 11:59:25 AM 5.00 mg/L 10 398 0 Cadmium 7/3/2012 5:13:00 AM 0.020 mg/L 1 0.069 0 Chromium 7/3/2012 5:13:00 AM 0.10 mg/L 1 0.40 0 Copper 7/3/2012 5:13:00 AM 0.10 mg/L 1 0.34 0 Iron 7/3/2012 5:13:00 AM 0.50 mg/L 1 420 0 Lead 7/3/2012 5:13:00 AM 0.20 mg/L 1 0.25 0 Manganese 7/3/2012 5:13:00 AM 0.10 mg/L 1 338 0 Nickel 7/3/2012 5:13:00 AM 0.10 mg/L 1 1.89 0 Selenium 7/3/2012 5:13:00 AM 0.20 mg/L 1 1.36 0 Silver 7/3/2012 5:13:00 AM 0.050 mg/L 1 < 0.050 0 Zinc 7/3/2012 5:13:00 AM 0.10 mg/L 1 1.13 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 7/3/2012 0.02 mg/L 1 0.38 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: AMS

Oil & Grease 6/27/2012 2:26:00 PM 19 mg/L 3.85 < 19 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Monday, July23, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 Q(a) Order No.: G1207116 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 4 sample(s) on 7/3/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 6

### 23-Jul-12 Date: 

# Geochemical Testing
Project: Keystone 611 Q(a) CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1207116 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 6

### Project: Keystone 611 Q(a) Client Sample ID: Outfall 101

Collection Date: 7/3/2012 10:45:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1207116
Lab ID: G1207116-001

DF 

# Geochemical Testing Date: 23-Jul-12

Received Date: 7/3/2012 5:47:26 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: MS

Total suspended solids 7/5/2012 12:03:23 PM 1 mg/L 1 2 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 7/6/2012 9:52:17 AM 100 mg/L 5 29800 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 7/5/2012 7:10:00 AM 2 mg/L 1.5 < 2 0 Finish Date/Time 7/5/2012 7:10:00 AM 0 mg/L 1.5 7/10/2012 07:45 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SEM

Chloride 7/5/2012 4:08:00 PM 1000 mg/L 200 13900 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 7/6/2012 6:52:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 7/6/2012 6:52:00 PM 0.02 mg/L 1 0.14 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 7/5/2012 3:18:40 PM 0.0002 mg/L 1 < 0.0002 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 7/6/2012 6:41:00 PM 0.1 mg/L 1 < 0.1 0 Arsenic 7/6/2012 6:41:00 PM 0.02 mg/L 1 < 0.02 0 Beryllium 7/6/2012 6:41:00 PM 0.001 mg/L 1 < 0.001 0.8 Boron 7/9/2012 6:57:00 PM 2.50 mg/L 50 270 0 Cadmium 7/6/2012 6:41:00 PM 0.002 mg/L 1 0.002 0 Chromium 7/6/2012 6:41:00 PM 0.01 mg/L 1 < 0.01 0 Copper 7/6/2012 6:41:00 PM 0.01 mg/L 1 < 0.01 0.1 Iron 7/6/2012 6:41:00 PM 0.05 mg/L 1 < 0.05 0 Lead 7/6/2012 6:41:00 PM 0.02 mg/L 1 0.03 0.1 Manganese 7/6/2012 6:41:00 PM 0.01 mg/L 1 14.8 0 Nickel 7/6/2012 6:41:00 PM 0.01 mg/L 1 < 0.01 0 Selenium 7/6/2012 6:41:00 PM 0.02 mg/L 1 0.14 3.4 Silver 7/6/2012 6:41:00 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 7/6/2012 6:41:00 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 7/16/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 7/9/2012 2:15:00 PM 5 mg/L 1.05 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 6

### Project: Keystone 611 Q(a) Client Sample ID: FGD Influent

Collection Date: 7/3/2012 10:30:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1207116
Lab ID: G1207116-002

DF 

# Geochemical Testing Date: 23-Jul-12

Received Date: 7/3/2012 5:47:26 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 7/6/2012 9:52:17 AM 200 mg/L 10 37700 0 

### PHYSICAL TESTS SM 2540D Analyst: MS

Total suspended solids 7/5/2012 12:30:06 PM 50 mg/L 10 33300 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 7/5/2012 7:10:00 AM 6 mg/L 6 32 0 Finish Date/Time 7/5/2012 7:10:00 AM 0 mg/L 6 7/10/2012 07:45 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SEM

Chloride 7/5/2012 4:08:00 PM 1000 mg/L 200 16800 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 7/6/2012 7:04:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 7/6/2012 7:04:00 PM 0.02 mg/L 1 0.47 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 7/5/2012 3:20:56 PM 0.100 mg/L 500 0.745 0 

### INORGANIC METALS EPA 200.7 Analyst: MS

Aluminum 7/10/2012 1:06:11 PM 1.0 mg/L 1 499 0 Arsenic 7/10/2012 1:06:11 PM 0.20 mg/L 1 2.99 0 Beryllium 7/10/2012 1:06:11 PM 0.010 mg/L 1 0.084 0 Boron 7/11/2012 6:06:00 PM 5.00 mg/L 10 439 0 Cadmium 7/10/2012 1:06:11 PM 0.020 mg/L 1 0.049 0 Chromium 7/10/2012 1:06:11 PM 0.10 mg/L 1 2.51 0 Copper 7/10/2012 1:06:11 PM 0.10 mg/L 1 2.17 0 Iron 7/10/2012 1:30:00 PM 5.00 mg/L 10 2380 0 Lead 7/10/2012 1:06:11 PM 0.20 mg/L 1 1.06 0 Manganese 7/10/2012 1:30:00 PM 1.00 mg/L 10 408 0 Nickel 7/10/2012 1:06:11 PM 0.10 mg/L 1 4.17 0 Selenium 7/10/2012 1:06:11 PM 0.20 mg/L 1 6.02 0 Silver 7/10/2012 1:06:11 PM 0.050 mg/L 1 < 0.050 0 Zinc 7/10/2012 1:06:11 PM 0.10 mg/L 1 5.84 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 7/16/2012 0.02 mg/L 1 2.51 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 7/9/2012 3:41:00 PM 18 mg/L 3.57 < 18 0

I.D. 56-00306 PA DEP 

# Page 4 of 6

### Project: Keystone 611 Q(a) Client Sample ID: Plum Creek

Collection Date: 7/3/2012 8:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1207116
Lab ID: G1207116-003

DF 

# Geochemical Testing Date: 23-Jul-12

Received Date: 7/3/2012 5:47:26 PM 

# Laboratory Results

Sampled By : Client

MCL
INORGANIC NON METALS SM 4500-CO2D Analyst: MS

Bicarbonate 7/6/2012 12:36:00 PM 5 mg/L CaCO3 1 38 0 

### INORGANIC NON-METALS SM 4500-CO2 Analyst: MS

Carbonate 7/6/2012 12:36:00 PM 5 mg/L CaCO3 1 < 5 0 

### PH BY SM 4500 H+B SM4500-H+B Analyst: MS

Lab pH H 7/6/2012 12:36:00 PM 0 su 1 7.42 0 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 7/6/2012 9:52:17 AM 20 mg/L 1 148 0 

### PHYSICAL TESTS SM 2540D Analyst: MS

Total suspended solids 7/5/2012 12:30:06 PM 5 mg/L 1 < 5 0 

### INORGANIC NON-METALS ASTM D1067-02 Analyst: MS

Alkalinity to pH 4.5 7/6/2012 12:36:00 PM 5 mg/L CaCO3 1 38 0 

### INORGANIC NON-METALS EPA 300.0 Analyst: MLR

Nitrate Nitrogen 7/3/2012 9:27:00 PM 0.05 mg/L as N 1 0.13 0 Nitrite Nitrogen 7/3/2012 9:27:00 PM 0.05 mg/L as N 1 < 0.05 0 Nitrate - Nitrite 7/3/2012 9:27:00 PM 0.05 mg/L as N 1 0.13 0 

### INORGANIC NON-METALS EPA 300.0 Analyst: MLR

Chloride 7/3/2012 9:27:00 PM 1 mg/L 1 6 0 Fluoride 7/3/2012 9:27:00 PM 0.1 mg/L 1 < 0.1 0 Sulfate 7/3/2012 9:27:00 PM 2 mg/L 1 42 0 

### INORGANIC NON-METALS EPA 350.1 Analyst: SLY

Ammonia Nitrogen - Distilled 7/6/2012 9:40:16 AM 0.10 mg/L as N 1 < 0.10 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Barium 7/6/2012 9:17:00 PM 0.01 mg/L 1 0.04 0 Boron 7/6/2012 9:17:00 PM 0.05 mg/L 1 < 0.05 0 Calcium 7/6/2012 9:17:00 PM 0.1 mg/L 1 18.5 0 Iron 7/6/2012 9:17:00 PM 0.05 mg/L 1 0.15 0 Magnesium 7/6/2012 9:17:00 PM 0.1 mg/L 1 5.5 0 Manganese 7/6/2012 9:17:00 PM 0.01 mg/L 1 0.04 0 Potassium 7/9/2012 7:47:00 PM 0.5 mg/L 1 1.8 0 Sodium 7/6/2012 9:17:00 PM 0.2 mg/L 1 15.7 0 Strontium 7/6/2012 9:17:00 PM 0.01 mg/L 1 0.19 0 

### INDICATOR ORGANIC PARAMETERS SM 20 5310-C Analyst: ACG

Total Organic Carbon 7/5/2012 8:44:00 PM 0.5 mg/L 1 2.1 0

I.D. 56-00306 PA DEP 

# Page 5 of 6

### Project: Keystone 611 Q(a) Client Sample ID: Crooked Creek

Collection Date: 7/3/2012 8:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1207116
Lab ID: G1207116-004

DF 

# Geochemical Testing Date: 23-Jul-12

Received Date: 7/3/2012 5:47:26 PM 

# Laboratory Results

Sampled By : Client

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 7/6/2012 9:52:17 AM 20 mg/L 1 342 0 

### PHYSICAL TESTS SM 2540D Analyst: MS

Total suspended solids 7/5/2012 12:30:05 PM 5 mg/L 1 20 0 

### INORGANIC NON-METALS ASTM D1067-02 Analyst: MS

Alkalinity to pH 4.5 7/6/2012 12:39:00 PM 5 mg/L CaCO3 1 75 0 

### INORGANIC NON-METALS EPA 300.0 Analyst: MLR

Nitrate Nitrogen 7/3/2012 9:44:00 PM 0.05 mg/L as N 1 0.19 0 Nitrite Nitrogen 7/3/2012 9:44:00 PM 0.05 mg/L as N 1 < 0.05 0 Nitrate - Nitrite 7/3/2012 9:44:00 PM 0.05 mg/L as N 1 0.19 0 

### INORGANIC NON-METALS EPA 300.0 Analyst: MLR

Chloride 7/3/2012 9:44:00 PM 1 mg/L 1 44 0 Sulfate 7/3/2012 9:44:00 PM 2 mg/L 1 98 0 

### INORGANIC METALS EPA 200.7 Analyst: MS

Calcium 7/10/2012 6:40:00 AM 0.1 mg/L 1 36.0 0 Iron 7/10/2012 6:40:00 AM 0.05 mg/L 1 2.44 0 Magnesium 7/10/2012 6:40:00 AM 0.1 mg/L 1 9.7 0 Manganese 7/10/2012 6:40:00 AM 0.01 mg/L 1 0.83 0 Potassium 7/10/2012 4:17:00 PM 0.5 mg/L 1 2.9 0 Sodium 7/10/2012 4:17:00 PM 0.2 mg/L 1 74.2 0 

### INDICATOR ORGANIC PARAMETERS SM 20 5310-C Analyst: ACG

Total Organic Carbon 7/5/2012 11:30:00 PM 0.5 mg/L 1 2.1 0

I.D. 56-00306 PA DEP 

# Page 6 of 6

# Tuesday, July24, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 Q(b) Order No.: G1207349 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 7 sample(s) on 7/10/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 9

### 24-Jul-12 Date: 

# Geochemical Testing
Project: Keystone 611 Q(b) CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1207349 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 9

### Project: Keystone 611 Q(b) Client Sample ID: FGD Influent

Collection Date: 7/10/2012 9:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1207349
Lab ID: G1207349-001

DF 

# Geochemical Testing Date: 24-Jul-12

Received Date: 7/10/2012 6:57:36 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 7/11/2012 4:20:44 PM 200 mg/L 10 50100 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 7/11/2012 4:47:48 PM 100 mg/L 20 33600 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 7/11/2012 8:15:00 AM 6 mg/L 6 26 0 Finish Date/Time 7/11/2012 8:15:00 AM 0 mg/L 6 7/16/2012 09:15 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SEM

Chloride 7/11/2012 10:37:00 A M 1000 mg/L 200 14400 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 7/12/2012 10:16:00 A M 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 7/12/2012 10:16:00 A M 0.02 mg/L 1 0.50 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 7/12/2012 9:46:53 AM 0.100 mg/L 500 0.890 0 

### INORGANIC METALS EPA 200.7 Analyst: MS

Aluminum 7/18/2012 6:39:00 AM 1.0 mg/L 1 525 0 Arsenic 7/18/2012 6:39:00 AM 0.20 mg/L 1 5.25 0 Beryllium 7/18/2012 6:39:00 AM 0.010 mg/L 1 0.101 0 Boron 7/18/2012 2:59:00 PM 5.00 mg/L 10 456 0 Cadmium 7/18/2012 6:39:00 AM 0.020 mg/L 1 0.212 0 Chromium 7/18/2012 6:39:00 AM 0.10 mg/L 1 3.11 0 Copper 7/18/2012 6:39:00 AM 0.10 mg/L 1 1.97 0 Iron 7/18/2012 2:59:00 PM 5.00 mg/L 10 2800 0 Lead 7/18/2012 6:39:00 AM 0.20 mg/L 1 1.60 0 Manganese 7/18/2012 6:39:00 AM 0.10 mg/L 1 429 0 Nickel 7/18/2012 6:39:00 AM 0.10 mg/L 1 5.23 0 Selenium 7/18/2012 6:39:00 AM 0.20 mg/L 1 6.93 0 Silver 7/18/2012 6:39:00 AM 0.050 mg/L 1 < 0.050 0 Zinc 7/18/2012 6:39:00 AM 0.10 mg/L 1 7.41 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 7/20/2012 0.02 mg/L 1 3.11 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: AMS

Oil & Grease 7/12/2012 12:43:00 P M 19 mg/L 3.85 < 19 0

I.D. 56-00306 PA DEP 

# Page 3 of 9

### Project: Keystone 611 Q(b) Client Sample ID: Outfall 101

Collection Date: 7/10/2012 9:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1207349
Lab ID: G1207349-002

DF 

# Geochemical Testing Date: 24-Jul-12

Received Date: 7/10/2012 6:57:36 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 7/12/2012 3:12:56 PM 5 mg/L 1 < 5 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 7/11/2012 4:20:43 PM 20 mg/L 1 27100 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 7/11/2012 8:15:00 AM 2 mg/L 1.5 < 2 25 Finish Date/Time 7/11/2012 8:15:00 AM 0 mg/L 1.5 7/16/2012 09:15 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SEM

Chloride 7/11/2012 10:37:00 A M 1000 mg/L 200 17200 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 7/12/2012 11:38:00 A M 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 7/12/2012 11:38:00 A M 0.02 mg/L 1 0.13 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 7/12/2012 9:49:04 AM 0.0002 mg/L 1 < 0.0002 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 7/15/2012 10:00:46 P M 0.1 mg/L 1 < 0.1 0 Arsenic 7/15/2012 10:00:46 P M 0.02 mg/L 1 < 0.02 0 Beryllium 7/12/2012 11:09:00 A M 0.001 mg/L 1 < 0.001 0.8 Boron 7/13/2012 4:25:00 PM 2.50 mg/L 50 278 0 Cadmium 7/12/2012 11:09:00 A M 0.002 mg/L 1 0.003 0 Chromium 7/15/2012 10:00:46 P M 0.01 mg/L 1 < 0.01 0 Copper 7/12/2012 11:09:00 A M 0.01 mg/L 1 < 0.01 0.1 Iron 7/12/2012 11:09:00 A M 0.05 mg/L 1 < 0.05 0 Lead 7/15/2012 10:00:46 P M 0.02 mg/L 1 < 0.02 0.1 Manganese 7/12/2012 11:09:00 A M 0.01 mg/L 1 14.0 0 Nickel 7/12/2012 11:09:00 A M 0.01 mg/L 1 < 0.01 0 Selenium 7/12/2012 11:09:00 A M 0.02 mg/L 1 0.16 3.4 Silver 7/12/2012 11:09:00 A M 0.005 mg/L 1 < 0.005 0 Zinc 7/12/2012 11:09:00 A M 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 7/16/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: AMS

Oil & Grease 7/12/2012 12:41:00 P M 5 mg/L 1.01 < 5 15

I.D. 56-00306 PA DEP 

# Page 4 of 9

### Project: Keystone 611 Q(b) Client Sample ID: IMP 603

Collection Date: 7/10/2012 7:05:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1207349
Lab ID: G1207349-003

DF 

# Geochemical Testing Date: 24-Jul-12

Received Date: 7/10/2012 6:57:36 PM 

# Laboratory Results

Sampled By : Client

MCL
VOLATILE ORGANIC COMPOUNDS EPA 624 Analyst: SJM

Chloroform 7/12/2012 4:07:00 AM 2.0 μg/L 1 < 2.0 0

I.D. 56-00306 PA DEP 

# Page 5 of 9

### Project: Keystone 611 Q(b) Client Sample ID: IMP 703 OUTLET

Collection Date: 7/10/2012 10:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1207349
Lab ID: G1207349-004

DF 

# Geochemical Testing Date: 24-Jul-12

Received Date: 7/10/2012 6:57:36 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 7/11/2012 4:47:48 PM 5 mg/L 1 < 5 30 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron 7/12/2012 12:04:00 P M 0.05 mg/L 1 0.21 0 Manganese 7/12/2012 12:04:00 P M 0.01 mg/L 1 1.32 0

I.D. 56-00306 PA DEP 

# Page 6 of 9

### Project: Keystone 611 Q(b) Client Sample ID: IMP 703 INLET

Collection Date: 7/10/2012 9:55:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1207349
Lab ID: G1207349-005

DF 

# Geochemical Testing Date: 24-Jul-12

Received Date: 7/10/2012 6:57:36 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 7/11/2012 4:47:48 PM 5 mg/L 1 8 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron 7/12/2012 12:50:00 P M 0.05 mg/L 1 58.4 0 Manganese 7/12/2012 12:50:00 P M 0.01 mg/L 1 12.8 0

I.D. 56-00306 PA DEP 

# Page 7 of 9

### Project: Keystone 611 Q(b) Client Sample ID: SWRO 013

Collection Date: 7/10/2012 7:40:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1207349
Lab ID: G1207349-006

DF 

# Geochemical Testing Date: 24-Jul-12

Received Date: 7/10/2012 6:57:36 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 7/11/2012 4:47:48 PM 5 mg/L 1 < 5 0 

### INORGANIC NON-METALS EPA 300.0 Analyst: MLR

Sulfate 7/11/2012 12:49:00 P M 2 mg/L 1 86 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Arsenic 7/12/2012 4:09:00 PM 0.02 mg/L 1 < 0.02 0 Barium 7/12/2012 4:09:00 PM 0.01 mg/L 1 0.07 0 Iron 7/12/2012 4:09:00 PM 0.05 mg/L 1 < 0.05 0 Manganese 7/12/2012 4:09:00 PM 0.01 mg/L 1 < 0.01 0

I.D. 56-00306 PA DEP 

# Page 8 of 9

### Project: Keystone 611 Q(b) Client Sample ID: SWRO 014

Collection Date: 7/10/2012 7:55:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1207349
Lab ID: G1207349-007

DF 

# Geochemical Testing Date: 24-Jul-12

Received Date: 7/10/2012 6:57:36 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 7/11/2012 4:47:47 PM 5 mg/L 1 38 0 

### INORGANIC NON-METALS EPA 300.0 Analyst: MLR

Sulfate 7/11/2012 1:06:00 PM 2 mg/L 1 47 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Arsenic 7/12/2012 4:13:00 PM 0.02 mg/L 1 < 0.02 0 Barium 7/12/2012 4:13:00 PM 0.01 mg/L 1 0.10 0 Iron 7/12/2012 4:13:00 PM 0.05 mg/L 1 0.28 0 Manganese 7/12/2012 4:13:00 PM 0.01 mg/L 1 0.10 0

I.D. 56-00306 PA DEP 

# Page 9 of 9

# Monday, July30, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1207652 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 7/17/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 30-Jul-12 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1207652 

# CASE NARRATIVE

Samples were not filtered in the field for dissolved metals; samples were lab filtered. No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 7/17/2012 10:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1207652
Lab ID: G1207652-001

DF 

# Geochemical Testing Date: 30-Jul-12

Received Date: 7/17/2012 6:48:22 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 7/18/2012 3:56:30 PM 1 mg/L 1 2 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 7/18/2012 3:57:02 PM 20 mg/L 1 32600 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: KMW

BOD 5-day 7/18/2012 8:35:00 AM 2 mg/L 1.5 < 2 25 Finish Date/Time 7/18/2012 8:35:00 AM 0 mg/L 1.5 7/23/2012 09:33 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SEM

Chloride 7/18/2012 4:12:00 PM 1000 mg/L 200 16000 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 7/19/2012 6:23:00 AM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 7/19/2012 6:23:00 AM 0.02 mg/L 1 0.14 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 7/19/2012 9:45:02 AM 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 7/19/2012 5:44:00 AM 0.1 mg/L 1 < 0.1 0 Arsenic 7/19/2012 5:44:00 AM 0.02 mg/L 1 < 0.02 0 Beryllium 7/19/2012 5:44:00 AM 0.001 mg/L 1 < 0.001 0.8 Boron 7/19/2012 10:12:00 A M 2.50 mg/L 50 248 0 Cadmium 7/19/2012 5:44:00 AM 0.002 mg/L 1 0.002 0 Chromium 7/19/2012 5:44:00 AM 0.01 mg/L 1 < 0.01 0 Copper 7/19/2012 5:44:00 AM 0.01 mg/L 1 < 0.01 0.1 Iron 7/19/2012 5:44:00 AM 0.05 mg/L 1 < 0.05 0 Lead 7/19/2012 5:44:00 AM 0.02 mg/L 1 < 0.02 0.1 Manganese 7/19/2012 5:44:00 AM 0.01 mg/L 1 4.89 0 Nickel 7/19/2012 5:44:00 AM 0.01 mg/L 1 < 0.01 0 Selenium 7/19/2012 5:44:00 AM 0.02 mg/L 1 0.12 3.4 Silver 7/19/2012 5:44:00 AM 0.005 mg/L 1 < 0.005 0.1 Zinc 7/19/2012 5:44:00 AM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 7/20/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: AMS

Oil & Grease 7/19/2012 5:20:00 PM 5 mg/L 1 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 7/17/2012 10:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1207652
Lab ID: G1207652-002

DF 

# Geochemical Testing Date: 30-Jul-12

Received Date: 7/17/2012 6:48:22 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 7/18/2012 3:57:02 PM 200 mg/L 10 41200 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 7/18/2012 3:56:34 PM 100 mg/L 20 17600 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: KMW

BOD 5-day 7/18/2012 8:35:00 AM 3 mg/L 3 10 0 Finish Date/Time 7/18/2012 8:35:00 AM 0 mg/L 3 7/23/2012 09:33 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SEM

Chloride 7/18/2012 4:12:00 PM 1000 mg/L 200 17100 0 

### INORGANIC METALS USGS I-1230-85 Analyst: SEM

Hexavalent Chromium 7/17/2012 7:23:00 PM 0.020 mg/L 1 < 0.020 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 7/19/2012 2:36:48 PM 0.05 mg/L 1 0.30 0 Selenium, dissolved 7/19/2012 2:36:48 PM 0.02 mg/L 1 0.41 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 7/19/2012 9:47:11 AM 0.100 mg/L 500 0.660 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 7/19/2012 9:27:55 PM 1.0 mg/L 1 284 0 Arsenic 7/19/2012 9:27:55 PM 0.20 mg/L 1 2.34 0 Beryllium 7/19/2012 9:27:55 PM 0.010 mg/L 1 0.052 0 Boron 7/19/2012 9:27:55 PM 0.50 mg/L 1 312 0 Cadmium 7/21/2012 10:48:00 P M 0.020 mg/L 1 0.141 0 Chromium 7/21/2012 10:48:00 P M 0.10 mg/L 1 2.03 0 Copper 7/21/2012 10:48:00 P M 0.10 mg/L 1 1.28 0 Iron 7/19/2012 9:27:55 PM 0.50 mg/L 1 1090 0 Lead 7/19/2012 9:27:55 PM 0.20 mg/L 1 0.75 0 Manganese 7/19/2012 9:27:55 PM 0.10 mg/L 1 288 0 Nickel 7/19/2012 9:27:55 PM 0.10 mg/L 1 2.34 0 Selenium 7/21/2012 10:48:00 P M 0.20 mg/L 1 5.53 0 Silver 7/19/2012 9:27:55 PM 0.050 mg/L 1 < 0.050 0 Zinc 7/21/2012 10:48:00 P M 0.10 mg/L 1 4.65 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 7/25/2012 0.02 mg/L 1 2.01 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: AMS

Oil & Grease 7/19/2012 6:14:00 PM 18 mg/L 3.57 < 18 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Thursday, August 02, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1207974 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 7/24/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 02-Aug-12 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1207974 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 7/24/2012 10:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1207974
Lab ID: G1207974-001

DF 

# Geochemical Testing Date: 02-Aug-12

Received Date: 7/24/2012 6:41:24 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 7/25/2012 3:32:36 PM 1 mg/L 1 < 1 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 7/25/2012 3:33:21 PM 20 mg/L 1 26600 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: KMW

BOD 5-day 7/25/2012 10:45:00 A M 2 mg/L 1.5 < 2 25 Finish Date/Time 7/25/2012 10:45:00 A M 0 mg/L 1.5 7/30/2012 10:33 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SEM

Chloride 7/25/2012 2:52:00 PM 1000 mg/L 200 14000 0 

### INORGANIC METALS EPA 200.7 Analyst: MS

Iron, dissolved 7/26/2012 8:59:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 7/26/2012 8:59:00 PM 0.02 mg/L 1 0.17 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 7/25/2012 1:42:34 PM 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: MS

Aluminum 7/26/2012 9:40:00 PM 0.1 mg/L 1 < 0.1 0 Arsenic 7/26/2012 9:40:00 PM 0.02 mg/L 1 0.02 0 Beryllium 7/26/2012 9:40:00 PM 0.001 mg/L 1 < 0.001 0.8 Boron 7/27/2012 2:58:00 PM 2.50 mg/L 50 263 0 Cadmium 7/26/2012 9:40:00 PM 0.002 mg/L 1 0.003 0 Chromium 7/26/2012 9:40:00 PM 0.01 mg/L 1 < 0.01 0 Copper 7/26/2012 9:40:00 PM 0.01 mg/L 1 < 0.01 0.1 Iron 7/26/2012 9:40:00 PM 0.05 mg/L 1 < 0.05 0 Lead 7/26/2012 9:40:00 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 7/26/2012 9:40:00 PM 0.01 mg/L 1 7.47 0 Nickel 7/26/2012 9:40:00 PM 0.01 mg/L 1 0.01 0 Selenium 7/26/2012 9:40:00 PM 0.02 mg/L 1 0.17 3.4 Silver 7/26/2012 9:40:00 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 7/26/2012 9:40:00 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 7/31/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 7/25/2012 1:56:00 PM 5 mg/L 1.05 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 7/24/2012 10:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1207974
Lab ID: G1207974-002

DF 

# Geochemical Testing Date: 02-Aug-12

Received Date: 7/24/2012 6:41:24 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 7/25/2012 3:33:18 PM 200 mg/L 10 36700 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 7/25/2012 3:32:43 PM 50 mg/L 10 25800 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: KMW

BOD 5-day 7/25/2012 10:45:00 A M 3 mg/L 3 26 0 Finish Date/Time 7/25/2012 10:45:00 A M 0 mg/L 3 7/30/2012 10:33 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SEM

Chloride 7/25/2012 2:52:00 PM 1000 mg/L 200 17200 0 

### INORGANIC METALS USGS I-1230-85 Analyst: SAG

Hexavalent Chromium 7/24/2012 7:35:00 PM 0.020 mg/L 1 < 0.020 0 

### INORGANIC METALS EPA 200.7 Analyst: MS

Iron, dissolved 7/26/2012 9:55:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 7/26/2012 9:55:00 PM 0.02 mg/L 1 0.61 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 7/25/2012 1:44:47 PM 0.100 mg/L 500 0.835 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 7/25/2012 10:54:00 P M 1.0 mg/L 1 452 0 Arsenic 7/25/2012 10:54:00 P M 0.20 mg/L 1 4.21 0 Beryllium 7/25/2012 10:54:00 P M 0.010 mg/L 1 0.081 0 Boron 7/26/2012 11:45:00 A M 5.00 mg/L 10 442 0 Cadmium 7/25/2012 10:54:00 P M 0.020 mg/L 1 0.140 0 Chromium 7/25/2012 10:54:00 P M 0.10 mg/L 1 2.75 0 Copper 7/25/2012 10:54:00 P M 0.10 mg/L 1 1.64 0 Iron 7/25/2012 10:54:00 P M 0.50 mg/L 1 1940 0 Lead 7/25/2012 10:54:00 P M 0.20 mg/L 1 1.23 0 Manganese 7/25/2012 10:54:00 P M 0.10 mg/L 1 319 0 Nickel 7/25/2012 10:54:00 P M 0.10 mg/L 1 3.70 0 Selenium 7/25/2012 10:54:00 P M 0.20 mg/L 1 8.34 0 Silver 7/25/2012 10:54:00 P M 0.050 mg/L 1 < 0.050 0 Zinc 7/25/2012 10:54:00 P M 0.10 mg/L 1 5.77 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 7/31/2012 0.02 mg/L 1 2.75 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 7/26/2012 10:34:00 A M 19 mg/L 3.7 < 19 0 NOTES: The pH of the sample was >2.

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Page 1 of 4 Wednesday, August 15, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 M(a) Order No.: G1207C50 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 7/31/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Ti m ot hy W . Ber gst r

esser Di r

ect orofTechni cal Ser vi ces

# Page 2 of 4 15-Aug-12 Date: 

# Geochemical Testing
Project: Keystone 611 M(a) CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1207C50 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit

# Page 3 of 4 Project: Keystone 611 M(a) Client Sample ID: Outfall 101

Collection Date: 7/31/2012 10:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1207C50
Lab ID: G1207C50-001

DF 

# Geochemical Testing Date: 15-Aug-12

Received Date: 7/31/2012 6:27:03 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 8/1/2012 10:57:56 AM 5 mg/L 1 9 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 8/1/2012 10:57:38 AM 100 mg/L 5 27600 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 8/1/2012 9:20:00 AM 2 mg/L 1.5 < 2 25 Finish Date/Time 8/1/2012 9:20:00 AM 0 mg/L 1.5 8/6/2012 08:30 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: MLR

Chloride 8/1/2012 9:15:00 AM 1000 mg/L 200 15500 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 8/1/2012 7:46:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 8/1/2012 7:46:00 PM 0.02 mg/L 1 0.21 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 8/2/2012 11:48:14 AM 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 8/1/2012 7:32:00 PM 0.1 mg/L 1 < 0.1 0 Arsenic 8/1/2012 7:32:00 PM 0.02 mg/L 1 < 0.02 0 Beryllium 8/1/2012 7:32:00 PM 0.001 mg/L 1 < 0.001 0.8 Boron 8/2/2012 10:50:37 AM 2.50 mg/L 50 274 0 Cadmium 8/1/2012 7:32:00 PM 0.002 mg/L 1 < 0.002 0 Chromium 8/1/2012 7:32:00 PM 0.01 mg/L 1 < 0.01 0 Copper 8/1/2012 7:32:00 PM 0.01 mg/L 1 < 0.01 0.1 Iron 8/1/2012 7:32:00 PM 0.05 mg/L 1 < 0.05 0 Lead 8/1/2012 7:32:00 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 8/1/2012 7:32:00 PM 0.01 mg/L 1 2.94 0 Nickel 8/1/2012 7:32:00 PM 0.01 mg/L 1 < 0.01 0 Selenium 8/1/2012 7:32:00 PM 0.02 mg/L 1 0.20 3.4 Silver 8/1/2012 7:32:00 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 8/1/2012 7:32:00 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 8/2/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 8/1/2012 12:09:00 PM 5 mg/L 1 < 5 15

I.D. 56-00306 PA DEP

# Page 4 of 4 Project: Keystone 611 M(a) Client Sample ID: FGD Influent

Collection Date: 7/31/2012 9:54:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1207C50
Lab ID: G1207C50-002

DF 

# Geochemical Testing Date: 15-Aug-12

Received Date: 7/31/2012 6:27:03 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 8/1/2012 10:57:38 AM 100 mg/L 5 30500 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 8/1/2012 10:57:55 AM 100 mg/L 20 13100 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 8/1/2012 9:20:00 AM 3 mg/L 3 9 0 Finish Date/Time 8/1/2012 9:20:00 AM 0 mg/L 3 8/6/2012 08:30 

### INORGANIC NON-METALS SM 4500-CL E Analyst: MLR

Chloride 8/1/2012 9:15:00 AM 1000 mg/L 200 16300 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 8/1/2012 8:01:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 8/1/2012 8:01:00 PM 0.02 mg/L 1 0.15 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 8/2/2012 11:50:25 AM 0.100 mg/L 500 0.362 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 8/7/2012 5:59:00 PM 1.0 mg/L 1 213 0 Arsenic 8/7/2012 5:59:00 PM 0.20 mg/L 1 2.05 0 Beryllium 8/7/2012 5:59:00 PM 0.010 mg/L 1 0.044 0 Boron 8/9/2012 1:27:00 PM 5.00 mg/L 10 436 0 Cadmium 8/7/2012 5:59:00 PM 0.020 mg/L 1 0.090 0 Chromium 8/7/2012 5:59:00 PM 0.10 mg/L 1 1.51 0 Copper 8/7/2012 5:59:00 PM 0.10 mg/L 1 0.80 0 Iron 8/7/2012 5:59:00 PM 0.50 mg/L 1 1110 0 Lead 8/7/2012 5:59:00 PM 0.20 mg/L 1 0.72 0 Manganese 8/7/2012 5:59:00 PM 0.10 mg/L 1 268 0 Nickel 8/7/2012 5:59:00 PM 0.10 mg/L 1 2.38 0 Selenium 8/7/2012 5:59:00 PM 0.20 mg/L 1 4.82 0 Silver 8/7/2012 5:59:00 PM 0.050 mg/L 1 < 0.050 0 Zinc 8/7/2012 5:59:00 PM 0.10 mg/L 1 3.03 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 8/9/2012 0.02 mg/L 1 1.00 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 8/2/2012 3:29:00 PM 19 mg/L 3.7 < 19 0 NOTES: The pH of the sample was >2.

I.D. 56-00306 PA DEP

# Wednesday, August 15, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 M(b) Order No.: G1208299 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 8/7/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 15-Aug-12 Date: 

# Geochemical Testing
Project: Keystone 611 M(b) CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1208299 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 M(b) Client Sample ID: Outfall 101

Collection Date: 8/7/2012 10:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1208299
Lab ID: G1208299-001

DF 

# Geochemical Testing Date: 15-Aug-12

Received Date: 8/7/2012 6:30:32 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 8/8/2012 2:12:58 PM 5 mg/L 1 6 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 8/8/2012 4:41:43 PM 100 mg/L 5 25300 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: SEM

BOD 5-day 8/8/2012 8:15:00 AM 2 mg/L 1.5 < 2 25 Finish Date/Time 8/8/2012 8:15:00 AM 0 mg/L 1.5 8/13/2012 09:15 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SEM

Chloride 8/8/2012 3:17:00 PM 1000 mg/L 200 14100 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 8/10/2012 5:42:00 AM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 8/10/2012 5:42:00 AM 0.02 mg/L 1 0.19 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 8/10/2012 10:38:56 A M 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 8/8/2012 8:18:30 PM 0.1 mg/L 1 < 0.1 0 Arsenic 8/8/2012 8:18:30 PM 0.02 mg/L 1 < 0.02 0 Beryllium 8/8/2012 8:18:30 PM 0.001 mg/L 1 < 0.001 0.8 Boron 8/9/2012 2:53:00 PM 2.50 mg/L 50 275 0 Cadmium 8/8/2012 8:18:30 PM 0.002 mg/L 1 < 0.002 0 Chromium 8/8/2012 8:18:30 PM 0.01 mg/L 1 < 0.01 0 Copper 8/8/2012 8:18:30 PM 0.01 mg/L 1 0.01 0.1 Iron 8/8/2012 8:18:30 PM 0.05 mg/L 1 < 0.05 0 Lead 8/8/2012 8:18:30 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 8/8/2012 8:18:30 PM 0.01 mg/L 1 1.87 0 Nickel 8/8/2012 8:18:30 PM 0.01 mg/L 1 < 0.01 0 Selenium 8/8/2012 8:18:30 PM 0.02 mg/L 1 0.15 3.4 Silver 8/9/2012 2:41:00 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 8/8/2012 8:18:30 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 8/14/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 8/8/2012 2:41:00 PM 5 mg/L 1.01 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 M(b) Client Sample ID: FGD Influent

Collection Date: 8/7/2012 10:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1208299
Lab ID: G1208299-002

DF 

# Geochemical Testing Date: 15-Aug-12

Received Date: 8/7/2012 6:30:32 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 8/8/2012 4:41:43 PM 200 mg/L 10 33800 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 8/8/2012 2:12:29 PM 100 mg/L 20 5480 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: SEM

BOD 5-day 8/8/2012 8:15:00 AM 3 mg/L 3 12 0 Finish Date/Time 8/8/2012 8:15:00 AM 0 mg/L 3 8/13/2012 09:15 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SEM

Chloride 8/8/2012 3:17:00 PM 1000 mg/L 200 17300 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 8/10/2012 6:12:00 AM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 8/10/2012 6:12:00 AM 0.02 mg/L 1 0.82 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 8/10/2012 10:41:08 A M 0.100 mg/L 500 0.114 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 8/11/2012 3:32:00 PM 1.0 mg/L 1 88.1 0 Arsenic 8/11/2012 3:32:00 PM 0.20 mg/L 1 0.63 0 Beryllium 8/11/2012 3:32:00 PM 0.010 mg/L 1 0.014 0 Boron 8/13/2012 3:08:52 PM 5.00 mg/L 10 448 0 Cadmium 8/11/2012 3:32:00 PM 0.020 mg/L 1 0.053 0 Chromium 8/11/2012 3:32:00 PM 0.10 mg/L 1 0.43 0 Copper 8/11/2012 3:32:00 PM 0.10 mg/L 1 0.27 0 Iron 8/11/2012 3:32:00 PM 0.50 mg/L 1 391 0 Lead 8/11/2012 3:32:00 PM 0.20 mg/L 1 0.28 0 Manganese 8/11/2012 3:32:00 PM 0.10 mg/L 1 231 0 Nickel 8/11/2012 3:32:00 PM 0.10 mg/L 1 1.40 0 Selenium 8/11/2012 3:32:00 PM 0.20 mg/L 1 1.90 0 Silver 8/11/2012 3:32:00 PM 0.050 mg/L 1 < 0.050 0 Zinc 8/11/2012 3:32:00 PM 0.10 mg/L 1 1.04 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 8/14/2012 0.02 mg/L 1 0.41 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 8/8/2012 3:20:00 PM 19 mg/L 3.7 < 19 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Friday, August 24, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1208644 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 8/14/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 24-Aug-12 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1208644 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 8/14/2012 10:10:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1208644
Lab ID: G1208644-001

DF 

# Geochemical Testing Date: 24-Aug-12

Received Date: 8/14/2012 5:11:08 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 8/15/2012 2:36:48 PM 1 mg/L 1 1 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 8/15/2012 2:19:19 PM 20 mg/L 1 30900 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: JS

BOD 5-day 8/15/2012 8:15:00 AM 2 mg/L 1.5 < 2 25 Finish Date/Time 8/15/2012 8:15:00 AM 0 mg/L 1.5 8/20/2015 08:50 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SEM

Chloride 8/15/2012 5:02:00 PM 1000 mg/L 200 14000 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 8/16/2012 8:53:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 8/16/2012 8:53:00 PM 0.02 mg/L 1 0.18 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 8/15/2012 11:52:14 A M 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 8/16/2012 8:41:00 PM 0.1 mg/L 1 < 0.1 0 Arsenic 8/16/2012 8:41:00 PM 0.02 mg/L 1 < 0.02 0 Beryllium 8/16/2012 8:41:00 PM 0.001 mg/L 1 < 0.001 0.8 Boron 8/16/2012 8:41:00 PM 0.05 mg/L 1 309 0 Cadmium 8/16/2012 8:41:00 PM 0.002 mg/L 1 < 0.002 0 Chromium 8/16/2012 8:41:00 PM 0.01 mg/L 1 < 0.01 0 Copper 8/16/2012 8:41:00 PM 0.01 mg/L 1 < 0.01 0.1 Iron 8/16/2012 8:41:00 PM 0.05 mg/L 1 < 0.05 0 Lead 8/16/2012 8:41:00 PM 0.02 mg/L 1 0.02 0.1 Manganese 8/16/2012 8:41:00 PM 0.01 mg/L 1 5.58 0 Nickel 8/16/2012 8:41:00 PM 0.01 mg/L 1 < 0.01 0 Selenium 8/16/2012 8:41:00 PM 0.02 mg/L 1 0.14 3.4 Silver 8/16/2012 8:41:00 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 8/16/2012 8:41:00 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 8/21/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 8/16/2012 1:28:00 PM 5 mg/L 1 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 8/14/2012 9:45:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1208644
Lab ID: G1208644-002

DF 

# Geochemical Testing Date: 24-Aug-12

Received Date: 8/14/2012 5:11:08 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 8/15/2012 2:19:19 PM 200 mg/L 10 28900 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 8/15/2012 2:36:50 PM 100 mg/L 20 28400 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: JS

BOD 5-day 8/15/2012 8:15:00 AM 12 mg/L 12 65 0 Finish Date/Time 8/15/2012 8:15:00 AM 0 mg/L 12 8/20/2015 08:50 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SEM

Chloride 8/15/2012 5:02:00 PM 1000 mg/L 200 16900 0 

### INORGANIC METALS USGS I-1230-85 Analyst: SEM

Hexavalent Chromium 8/14/2012 6:14:00 PM 0.020 mg/L 1 < 0.020 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 8/16/2012 9:05:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 8/16/2012 9:05:00 PM 0.02 mg/L 1 1.07 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 8/15/2012 11:54:27 A M 0.100 mg/L 500 0.590 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 8/23/2012 2:33:00 AM 1.0 mg/L 1 457 0 Arsenic 8/23/2012 2:33:00 AM 0.20 mg/L 1 3.10 0 Beryllium 8/23/2012 2:33:00 AM 0.010 mg/L 1 0.083 0 Boron 8/23/2012 2:33:00 AM 0.50 mg/L 1 436 0 Cadmium 8/23/2012 2:33:00 AM 0.020 mg/L 1 0.197 0 Chromium 8/23/2012 2:33:00 AM 0.10 mg/L 1 2.66 0 Copper 8/23/2012 2:33:00 AM 0.10 mg/L 1 1.67 0 Iron 8/23/2012 12:58:09 P M 5.00 mg/L 10 2440 0 Lead 8/23/2012 2:33:00 AM 0.20 mg/L 1 1.06 0 Manganese 8/23/2012 2:33:00 AM 0.10 mg/L 1 331 0 Nickel 8/23/2012 2:33:00 AM 0.10 mg/L 1 3.97 0 Selenium 8/23/2012 2:33:00 AM 0.20 mg/L 1 6.02 0 Silver 8/23/2012 2:33:00 AM 0.050 mg/L 1 < 0.050 0 Zinc 8/23/2012 2:33:00 AM 0.10 mg/L 1 5.75 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 8/24/2012 0.02 mg/L 1 2.66 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 8/16/2012 1:27:00 PM 19 mg/L 3.7 < 19 0 NOTES: The pH of the sample was >2.

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Page 1 of 4 Friday , August 31, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Keystone 611 W Order No.: G1208903 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 8/21/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA,and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Ti m ot hy W . Ber gst r

esser Di r

ect or of Techni cal Ser vi ces

# Page 2 of 4 31-Aug-12 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1208903 

# CASE NARRATIVE

Samples were not filtered in the field for dissolved metals; samples were lab filtered. No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit

# Page 3 of 4 Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 8/21/2012 10:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1208903
Lab ID: G1208903-001

DF 

# Geochemical Testing Date: 31-Aug-12

Received Date: 8/21/2012 4:59:01 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Anal yst: KLS

Total suspended solids 8/22/2012 7:41:37 AM 1 mg/L 1 7 10 

### INORGANIC NON-METALS SM 2540 C Anal yst: KLS

Total dissolved solids 8/22/2012 7:41:27 AM 20 mg/L 1 37700 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: KMW

BOD 5-day 8/22/2012 9:10:00 AM 2 mg/L 1.5 2 25 Finish Date/Time 8/22/2012 9:10:00 AM 0 mg/L 1.5 8/27/2012 09:33 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SEM

Chloride 8/22/2012 2:32:00 PM 1000 mg/L 200 13500 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 8/22/2012 7:07:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 8/22/2012 7:07:00 PM 0.02 mg/L 1 0.25 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 8/30/2012 8:36:27 AM 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Anal yst: MBG

Aluminum 8/22/2012 6:58:00 PM 0.1 mg/L 1 < 0.1 0 Arsenic 8/22/2012 6:58:00 PM 0.02 mg/L 1 < 0.02 0 Beryllium 8/22/2012 6:58:00 PM 0.001 mg/L 1 < 0.001 0.8 Boron 8/22/2012 6:58:00 PM 0.05 mg/L 1 310 0 Cadmium 8/22/2012 6:58:00 PM 0.002 mg/L 1 < 0.002 0 Chromium 8/22/2012 6:58:00 PM 0.01 mg/L 1 < 0.01 0 Copper 8/22/2012 6:58:00 PM 0.01 mg/L 1 < 0.01 0.1 Iron 8/22/2012 6:58:00 PM 0.05 mg/L 1 < 0.05 0 Lead 8/22/2012 6:58:00 PM 0.02 mg/L 1 0.03 0.1 Manganese 8/22/2012 6:58:00 PM 0.01 mg/L 1 11.8 0 Nickel 8/22/2012 6:58:00 PM 0.01 mg/L 1 0.01 0 Selenium 8/22/2012 6:58:00 PM 0.02 mg/L 1 0.24 3.4 Silver 8/22/2012 6:58:00 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 8/22/2012 6:58:00 PM 0.01 mg/L 1 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 8/24/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Anal yst: NEL

Oil & Grease 8/22/2012 1:55:00 PM 6 mg/L 1.12 < 6 15

I.D. 56-00306 PA DEP

# Page 4 of 4 Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 8/21/2012 9:45:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1208903
Lab ID: G1208903-002

DF 

# Geochemical Testing Date: 31-Aug-12

Received Date: 8/21/2012 4:59:01 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Anal yst: KLS

Total dissolved solids 8/22/2012 7:41:26 AM 200 mg/L 10 41500 0 

### PHYSICAL TESTS SM 2540D Anal yst: KLS

Total suspended solids 8/22/2012 7:41:41 AM 100 mg/L 20 13100 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: KMW

BOD 5-day 8/22/2012 9:10:00 AM 6 mg/L 6 35 0 Finish Date/Time 8/22/2012 9:10:00 AM 0 mg/L 6 8/27/2012 09:33 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SEM

Chloride 8/22/2012 2:32:00 PM 1000 mg/L 200 16500 0 

### INORGANIC METALS USGS I-1230-85 Analyst: MLR

Hexavalent Chromium 8/21/2012 6:06:00 PM 0.020 mg/L 1 < 0.020 0 

### INORGANIC METALS EPA 200.7 Anal yst: MBG

Iron, dissolved 8/22/2012 7:30:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 8/22/2012 7:30:00 PM 0.02 mg/L 1 1.12 0 

### INORGANIC METALS SM 3112B Anal yst: JEK

Mercury 8/30/2012 8:47:27 AM 0.100 mg/L 500 0.264 0 

### INORGANIC METALS EPA 200.7 Anal yst: MBG

Aluminum 8/23/2012 4:34:45 AM 1.0 mg/L 1 174 0 Arsenic 8/23/2012 4:34:45 AM 0.20 mg/L 1 1.14 0 Beryllium 8/24/2012 12:45:13 P M 0.010 mg/L 1 0.035 0 Boron 8/24/2012 12:42:38 P M 5.00 mg/L 10 397 0 Cadmium 8/23/2012 4:34:45 AM 0.020 mg/L 1 0.113 0 Chromium 8/23/2012 4:34:45 AM 0.10 mg/L 1 1.03 0 Copper 8/23/2012 4:34:45 AM 0.10 mg/L 1 0.62 0 Iron 8/23/2012 4:34:45 AM 0.50 mg/L 1 1040 0 Lead 8/23/2012 4:34:45 AM 0.20 mg/L 1 0.43 0 Manganese 8/23/2012 4:34:45 AM 0.10 mg/L 1 338 0 Nickel 8/23/2012 4:34:45 AM 0.10 mg/L 1 2.41 0 Selenium 8/23/2012 4:34:45 AM 0.20 mg/L 1 3.16 0 Silver 8/24/2012 12:45:13 P M 0.050 mg/L 1 < 0.050 0 Zinc 8/24/2012 12:45:13 P M 0.10 mg/L 1 2.34 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Anal yst: LAN

Trivalent Chromium 8/24/2012 0.02 mg/L 1 1.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Anal yst: NEL

Oil & Grease 8/22/2012 2:48:00 PM 19 mg/L 3.7 < 19 0

I.D. 56-00306 PA DEP

# Page 1 of 4 Friday , September 07, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Keystone 611 W Order No.: G1208B61 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 8/28/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Ti m ot hy W . Ber gst r

esser Di r

ect orofTechni calSer vi ces

# Page 2 of 4 07-Sep-12 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1208B61 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit

# Page 3 of 4 Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 8/28/2012 10:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1208B61
Lab ID: G1208B61-001

DF 

# Geochemical Testing Date: 07-Sep-12

Received Date: 8/28/2012 5:49:51 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 8/29/2012 1:52:20 PM 1 mg/L 1 3 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 8/29/2012 1:38:44 PM 100 mg/L 5 38600 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 8/30/2012 6:50:00 AM 2 mg/L 1.5 < 2 25 Finish Date/Time 8/30/2012 6:50:00 AM 0 mg/L 1.5 9/4/2012 07:50 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SEM

Chloride 8/30/2012 8:47:00 AM 1000 mg/L 200 14300 0 

### INORGANIC METALS EPA 200.7 Analyst: AM

Iron, dissolved 8/29/2012 7:56:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 8/29/2012 7:56:00 PM 0.02 mg/L 1 0.14 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 8/30/2012 9:11:45 AM 0.0010 mg/L 5 < 0.0010 0.004 

### INORGANIC METALS EPA 200.7 Analyst: AM

Aluminum 8/29/2012 7:45:00 PM 0.1 mg/L 1 < 0.1 0 Arsenic 8/29/2012 7:45:00 PM 0.02 mg/L 1 < 0.02 0 Beryllium 8/29/2012 7:45:00 PM 0.001 mg/L 1 < 0.001 0.8 Boron 8/30/2012 11:27:11 A M 2.50 mg/L 50 279 0 Cadmium 8/29/2012 7:45:00 PM 0.002 mg/L 1 < 0.002 0 Chromium 8/29/2012 7:45:00 PM 0.01 mg/L 1 < 0.01 0 Copper 8/29/2012 7:45:00 PM 0.01 mg/L 1 < 0.01 0.1 Iron 8/29/2012 7:45:00 PM 0.05 mg/L 1 < 0.05 0 Lead 8/29/2012 7:45:00 PM 0.02 mg/L 1 0.02 0.1 Manganese 8/29/2012 7:45:00 PM 0.01 mg/L 1 10.0 0 Nickel 8/29/2012 7:45:00 PM 0.01 mg/L 1 < 0.01 0 Selenium 8/29/2012 7:45:00 PM 0.02 mg/L 1 0.12 3.4 Silver 8/29/2012 7:45:00 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 8/29/2012 7:45:00 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 9/5/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 8/30/2012 6:39:00 PM 5 mg/L 1.01 < 5 15

I.D. 56-00306 PA DEP

# Page 4 of 4 Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 8/28/2012 9:45:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1208B61
Lab ID: G1208B61-002

DF 

# Geochemical Testing Date: 07-Sep-12

Received Date: 8/28/2012 5:49:51 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 8/29/2012 1:38:44 PM 100 mg/L 5 24100 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 8/29/2012 1:52:19 PM 100 mg/L 20 23300 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 8/30/2012 6:50:00 AM 6 mg/L 6 28 0 Finish Date/Time 8/30/2012 6:50:00 AM 0 mg/L 6 9/4/2012 07:50 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SEM

Chloride 8/30/2012 8:47:00 AM 1000 mg/L 200 16300 0 

### INORGANIC METALS USGS I-1230-85 Analyst: JS

Hexavalent Chromium 8/28/2012 6:55:00 PM 0.020 mg/L 1 < 0.020 0 

### INORGANIC METALS EPA 200.7 Analyst: AM

Iron, dissolved 8/29/2012 8:23:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 8/29/2012 8:23:00 PM 0.02 mg/L 1 0.69 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 8/30/2012 9:13:58 AM 0.100 mg/L 500 0.535 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 8/31/2012 10:09:18 P M 1.0 mg/L 1 382 0 Arsenic 8/31/2012 10:09:18 P M 0.20 mg/L 1 2.29 0 Beryllium 8/31/2012 10:09:18 P M 0.010 mg/L 1 0.062 0 Boron 9/4/2012 6:25:00 PM 5.00 mg/L 10 425 0 Cadmium 8/31/2012 10:09:18 P M 0.020 mg/L 1 0.040 0 Chromium 8/31/2012 10:09:18 P M 0.10 mg/L 1 2.11 0 Copper 9/5/2012 3:08:00 AM 0.10 mg/L 1 1.47 0 Iron 9/4/2012 6:25:00 PM 5.00 mg/L 10 2290 0 Lead 8/31/2012 10:09:18 P M 0.20 mg/L 1 0.68 0 Manganese 8/31/2012 10:09:18 P M 0.10 mg/L 1 357 0 Nickel 8/31/2012 10:09:18 P M 0.10 mg/L 1 3.27 0 Selenium 9/5/2012 3:08:00 AM 0.20 mg/L 1 5.89 0 Silver 8/31/2012 10:09:18 P M 0.050 mg/L 1 < 0.050 0 Zinc 8/31/2012 10:09:18 P M 0.10 mg/L 1 4.57 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 9/5/2012 0.02 mg/L 1 2.11 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 8/30/2012 6:39:00 PM 19 mg/L 3.85 < 19 0

I.D. 56-00306 PA DEP

# Monday, September 17, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 M(a) Order No.: G1209135 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 9/5/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 5

### 17-Sep-12 Date: 

# Geochemical Testing
Project: Keystone 611 M(a) CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1209135 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 5

### Project: Keystone 611 M(a) Client Sample ID: Outfall 101

Collection Date: 9/5/2012 10:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1209135
Lab ID: G1209135-001

DF 

# Geochemical Testing Date: 17-Sep-12

Received Date: 9/5/2012 6:24:43 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 9/6/2012 1:52:51 PM 5 mg/L 1 6 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 9/6/2012 1:53:33 PM 20 mg/L 1 33700 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 9/6/2012 9:45:00 AM 2 mg/L 1.5 < 2 25 Finish Date/Time 9/6/2012 9:45:00 AM 0 mg/L 1.5 9/11/2012 10:35 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SEM

Chloride 9/7/2012 2:20:00 PM 1000 mg/L 200 15300 0 

### INORGANIC METALS EPA 200.7 Analyst: AM

Iron, dissolved 9/6/2012 7:45:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 9/6/2012 7:45:00 PM 0.02 mg/L 1 0.12 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 9/10/2012 8:02:16 AM 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: AM

Aluminum 9/6/2012 7:26:00 PM 0.1 mg/L 1 < 0.1 0 Arsenic 9/6/2012 7:26:00 PM 0.02 mg/L 1 < 0.02 0 Beryllium 9/6/2012 7:26:00 PM 0.001 mg/L 1 < 0.001 0.8 Boron 9/7/2012 3:28:20 PM 2.50 mg/L 50 287 0 Cadmium 9/6/2012 7:26:00 PM 0.002 mg/L 1 0.002 0 Chromium 9/6/2012 7:26:00 PM 0.01 mg/L 1 < 0.01 0 Copper 9/6/2012 7:26:00 PM 0.01 mg/L 1 < 0.01 0.1 Iron 9/6/2012 7:26:00 PM 0.05 mg/L 1 < 0.05 0 Lead 9/6/2012 7:26:00 PM 0.02 mg/L 1 0.02 0.1 Manganese 9/6/2012 7:26:00 PM 0.01 mg/L 1 10.9 0 Nickel 9/6/2012 7:26:00 PM 0.01 mg/L 1 0.01 0 Selenium 9/6/2012 7:26:00 PM 0.02 mg/L 1 0.10 3.4 Silver 9/6/2012 7:26:00 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 9/6/2012 7:26:00 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 9/14/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 9/7/2012 10:27:00 AM 5 mg/L 1.01 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 5

### Project: Keystone 611 M(a) Client Sample ID: FGD Influent

Collection Date: 9/5/2012 10:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1209135
Lab ID: G1209135-002

DF 

# Geochemical Testing Date: 17-Sep-12

Received Date: 9/5/2012 6:24:43 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 9/6/2012 1:53:33 PM 200 mg/L 10 46400 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 9/6/2012 1:53:12 PM 100 mg/L 20 20900 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 9/6/2012 9:45:00 AM 3 mg/L 3 7 0 Finish Date/Time 9/6/2012 9:45:00 AM 0 mg/L 3 9/11/2012 10:35 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SEM

Chloride 9/7/2012 2:20:00 PM 1000 mg/L 200 18200 0 

### INORGANIC METALS EPA 200.7 Analyst: AM

Iron, dissolved 9/6/2012 8:11:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 9/6/2012 8:11:00 PM 0.02 mg/L 1 0.21 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 9/10/2012 8:04:27 AM 0.100 mg/L 500 0.670 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 9/12/2012 12:18:39 A M 1.0 mg/L 1 337 0 Arsenic 9/12/2012 12:18:39 A M 0.20 mg/L 1 2.22 0 Beryllium 9/12/2012 12:18:39 A M 0.010 mg/L 1 0.057 0 Boron 9/12/2012 9:33:00 PM 5.00 mg/L 10 438 0 Cadmium 9/12/2012 12:18:39 A M 0.020 mg/L 1 0.023 0 Chromium 9/12/2012 12:18:39 A M 0.10 mg/L 1 2.06 0 Copper 9/12/2012 12:18:39 A M 0.10 mg/L 1 1.61 0 Iron 9/12/2012 9:33:00 PM 5.00 mg/L 10 2140 0 Lead 9/12/2012 12:18:39 A M 0.20 mg/L 1 0.82 0 Manganese 9/12/2012 12:18:39 A M 0.10 mg/L 1 379 0 Nickel 9/12/2012 12:18:39 A M 0.10 mg/L 1 3.40 0 Selenium 9/12/2012 12:18:39 A M 0.20 mg/L 1 5.78 0 Silver 9/13/2012 11:18:00 P M 0.050 mg/L 1 < 0.050 0 Zinc 9/12/2012 12:18:39 A M 0.10 mg/L 1 4.96 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 9/14/2012 0.02 mg/L 1 2.05 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 9/7/2012 10:33:00 AM 19 mg/L 3.7 < 19 0

I.D. 56-00306 PA DEP 

# Page 4 of 5

### Project: Keystone 611 M(a) Client Sample ID: FGD Influent

Collection Date: 9/5/2012 9:45:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1209135
Lab ID: G1209135-002

DF 

# Geochemical Testing Date: 17-Sep-12

Received Date: 9/5/2012 6:24:43 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 9/6/2012 1:53:33 PM 200 mg/L 10 46400 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 9/6/2012 1:53:12 PM 100 mg/L 20 20900 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 9/6/2012 9:45:00 AM 3 mg/L 3 7 0 Finish Date/Time 9/6/2012 9:45:00 AM 0 mg/L 3 9/11/2012 10:35 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SEM

Chloride 9/7/2012 2:20:00 PM 1000 mg/L 200 18200 0 

### INORGANIC METALS EPA 200.7 Analyst: AM

Iron, dissolved 9/6/2012 8:11:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 9/6/2012 8:11:00 PM 0.02 mg/L 1 0.21 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 9/10/2012 8:04:27 AM 0.100 mg/L 500 0.670 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 9/12/2012 12:18:39 A M 1.0 mg/L 1 337 0 Arsenic 9/12/2012 12:18:39 A M 0.20 mg/L 1 2.22 0 Beryllium 9/12/2012 12:18:39 A M 0.010 mg/L 1 0.057 0 Boron 9/12/2012 9:33:00 PM 5.00 mg/L 10 438 0 Cadmium 9/12/2012 12:18:39 A M 0.020 mg/L 1 0.023 0 Chromium 9/12/2012 12:18:39 A M 0.10 mg/L 1 2.06 0 Copper 9/12/2012 12:18:39 A M 0.10 mg/L 1 1.61 0 Iron 9/12/2012 9:33:00 PM 5.00 mg/L 10 2140 0 Lead 9/12/2012 12:18:39 A M 0.20 mg/L 1 0.82 0 Manganese 9/12/2012 12:18:39 A M 0.10 mg/L 1 379 0 Nickel 9/12/2012 12:18:39 A M 0.10 mg/L 1 3.40 0 Selenium 9/12/2012 12:18:39 A M 0.20 mg/L 1 5.78 0 Silver 9/13/2012 11:18:00 P M 0.050 mg/L 1 < 0.050 0 Zinc 9/12/2012 12:18:39 A M 0.10 mg/L 1 4.96 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 9/14/2012 0.02 mg/L 1 2.05 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 9/7/2012 10:33:00 AM 19 mg/L 3.7 < 19 0

I.D. 56-00306 PA DEP 

# Page 5 of 5

# Wednesday, September 19, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 M(b) Order No.: G1209391 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 9/11/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 19-Sep-12 Date: 

# Geochemical Testing
Project: Keystone 611 M(b) CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1209391 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 M(b) Client Sample ID: Outfall 101

Collection Date: 9/11/2012 10:30:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1209391
Lab ID: G1209391-001

DF 

# Geochemical Testing Date: 19-Sep-12

Received Date: 9/11/2012 7:04:09 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 9/12/2012 3:35:46 PM 5 mg/L 1 < 5 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 9/12/2012 3:35:26 PM 200 mg/L 10 34800 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 9/12/2012 8:50:00 AM 2 mg/L 1.5 < 2 25 Finish Date/Time 9/12/2012 8:50:00 AM 0 mg/L 1.5 9/17/2012 09:45 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SEM

Chloride 9/12/2012 11:43:00 A M 1000 mg/L 200 16900 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 9/14/2012 3:23:00 AM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 9/14/2012 3:23:00 AM 0.02 mg/L 1 0.11 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 9/13/2012 9:22:44 AM 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 9/14/2012 3:15:00 AM 0.1 mg/L 1 < 0.1 0 Arsenic 9/14/2012 6:10:51 PM 0.02 mg/L 1 < 0.02 0 Beryllium 9/14/2012 3:15:00 AM 0.001 mg/L 1 < 0.001 0.8 Boron 9/14/2012 6:08:14 PM 2.50 mg/L 50 330 0 Cadmium 9/14/2012 3:15:00 AM 0.002 mg/L 1 0.004 0 Chromium 9/14/2012 6:10:51 PM 0.01 mg/L 1 < 0.01 0 Copper 9/14/2012 3:15:00 AM 0.01 mg/L 1 < 0.01 0.1 Iron 9/14/2012 3:15:00 AM 0.05 mg/L 1 < 0.05 0 Lead 9/14/2012 6:10:51 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 9/14/2012 3:15:00 AM 0.01 mg/L 1 25.3 0 Nickel 9/14/2012 3:15:00 AM 0.01 mg/L 1 0.01 0 Selenium 9/14/2012 3:15:00 AM 0.02 mg/L 1 0.14 3.4 Silver 9/14/2012 3:15:00 AM 0.005 mg/L 1 < 0.005 0.1 Zinc 9/14/2012 3:15:00 AM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 9/18/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 9/12/2012 1:09:00 PM 5 mg/L 1.01 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 M(b) Client Sample ID: FGD Influent

Collection Date: 9/11/2012 10:20:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1209391
Lab ID: G1209391-002

DF 

# Geochemical Testing Date: 19-Sep-12

Received Date: 9/11/2012 7:04:09 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 9/12/2012 3:35:27 PM 200 mg/L 10 38000 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 9/12/2012 3:35:53 PM 100 mg/L 20 16400 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 9/12/2012 8:50:00 AM 3 mg/L 3 16 0 Finish Date/Time 9/12/2012 8:50:00 AM 0 mg/L 3 9/17/2012 09:45 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SEM

Chloride 9/12/2012 11:43:00 A M 1000 mg/L 200 17200 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 9/14/2012 3:30:00 AM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 9/14/2012 3:30:00 AM 0.02 mg/L 1 1.09 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 9/13/2012 9:24:58 AM 0.100 mg/L 500 0.465 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 9/15/2012 2:07:23 AM 1.0 mg/L 1 254 0 Arsenic 9/15/2012 2:07:23 AM 0.20 mg/L 1 1.80 0 Beryllium 9/15/2012 2:07:23 AM 0.010 mg/L 1 0.042 0 Boron 9/17/2012 4:15:00 PM 5.00 mg/L 10 437 0 Cadmium 9/15/2012 2:07:23 AM 0.020 mg/L 1 0.040 0 Chromium 9/15/2012 2:07:23 AM 0.10 mg/L 1 1.32 0 Copper 9/15/2012 2:07:23 AM 0.10 mg/L 1 1.03 0 Iron 9/15/2012 2:07:23 AM 0.50 mg/L 1 1420 0 Lead 9/15/2012 2:07:23 AM 0.20 mg/L 1 0.62 0 Manganese 9/15/2012 2:07:23 AM 0.10 mg/L 1 332 0 Nickel 9/15/2012 2:07:23 AM 0.10 mg/L 1 2.56 0 Selenium 9/15/2012 2:07:23 AM 0.20 mg/L 1 5.00 0 Silver 9/15/2012 2:07:23 AM 0.050 mg/L 1 < 0.050 0 Zinc 9/15/2012 2:07:23 AM 0.10 mg/L 1 3.54 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 9/18/2012 0.02 mg/L 1 1.28 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 9/12/2012 3:03:00 PM 24 mg/L 4.76 < 24 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Monday, October 01, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1209747 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 9/18/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 01-Oct-12 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1209747 

# CASE NARRATIVE

Samples were not filtered in the field for dissolved metals; samples were lab filtered. No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 9/18/2012 10:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1209747
Lab ID: G1209747-001

DF 

# Geochemical Testing Date: 01-Oct-12

Received Date: 9/18/2012 6:19:09 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 9/19/2012 3:20:00 PM 1 mg/L 1 2 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 9/19/2012 3:20:00 PM 200 mg/L 10 32600 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: KMW

BOD 5-day 9/19/2012 8:00:00 AM 3 mg/L 3 10 25 Finish Date/Time 9/19/2012 8:00:00 AM 0 mg/L 3 9/24/2012 08:00 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 9/24/2012 12:43:00 P M 1000 mg/L 200 15600 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 9/20/2012 7:15:34 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 9/20/2012 7:15:34 PM 0.02 mg/L 1 0.10 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 9/20/2012 2:25:41 PM 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 9/20/2012 7:12:59 PM 0.1 mg/L 1 < 0.1 0 Arsenic 9/20/2012 7:12:59 PM 0.02 mg/L 1 < 0.02 0 Beryllium 9/20/2012 7:12:59 PM 0.001 mg/L 1 < 0.001 0.8 Boron 9/21/2012 4:12:04 PM 2.50 mg/L 50 285 0 Cadmium 9/20/2012 7:12:59 PM 0.002 mg/L 1 < 0.002 0 Chromium 9/20/2012 7:12:59 PM 0.01 mg/L 1 < 0.01 0 Copper 9/20/2012 7:12:59 PM 0.01 mg/L 1 < 0.01 0.1 Iron 9/20/2012 7:12:59 PM 0.05 mg/L 1 < 0.05 0 Lead 9/20/2012 7:12:59 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 9/20/2012 7:12:59 PM 0.01 mg/L 1 32.9 0 Nickel 9/20/2012 7:12:59 PM 0.01 mg/L 1 < 0.01 0 Selenium 9/20/2012 7:12:59 PM 0.02 mg/L 1 0.11 3.4 Silver 9/20/2012 7:12:59 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 9/20/2012 7:12:59 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 9/24/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 9/20/2012 5:27:00 PM 5 mg/L 1.01 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 9/18/2012 10:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1209747
Lab ID: G1209747-002

DF 

# Geochemical Testing Date: 01-Oct-12

Received Date: 9/18/2012 6:19:09 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 9/19/2012 3:20:00 PM 20 mg/L 1 29200 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 9/19/2012 3:20:00 PM 100 mg/L 20 2120 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: KMW

BOD 5-day 9/19/2012 8:00:00 AM 2 mg/L 1.5 < 2 0 Finish Date/Time 9/19/2012 8:00:00 AM 0 mg/L 1.5 9/24/2012 08:00 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 9/24/2012 12:43:00 P M 1000 mg/L 200 15700 0 

### INORGANIC METALS USGS I-1230-85 Analyst: MLR

Hexavalent Chromium 9/18/2012 7:04:00 PM 0.020 mg/L 1 < 0.020 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 9/20/2012 8:28:23 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 9/20/2012 8:28:23 PM 0.02 mg/L 1 1.01 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 9/20/2012 2:32:27 PM 0.100 mg/L 500 < 0.100 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 9/25/2012 7:47:00 AM 1.0 mg/L 1 36.6 0 Arsenic 9/25/2012 7:47:00 AM 0.20 mg/L 1 < 0.20 0 Beryllium 9/25/2012 7:47:00 AM 0.010 mg/L 1 < 0.010 0 Boron 9/24/2012 6:21:00 PM 5.00 mg/L 10 317 0 Cadmium 9/25/2012 7:47:00 AM 0.020 mg/L 1 0.053 0 Chromium 9/25/2012 7:47:00 AM 0.10 mg/L 1 0.12 0 Copper 9/25/2012 7:47:00 AM 0.10 mg/L 1 0.12 0 Iron 9/25/2012 7:47:00 AM 0.50 mg/L 1 216 0 Lead 9/25/2012 7:47:00 AM 0.20 mg/L 1 < 0.20 0 Manganese 9/25/2012 7:47:00 AM 0.10 mg/L 1 304 0 Nickel 9/25/2012 7:47:00 AM 0.10 mg/L 1 1.48 0 Selenium 9/27/2012 11:39:00 P M 0.20 mg/L 1 1.57 0 Silver 9/25/2012 7:47:00 AM 0.050 mg/L 1 < 0.050 0 Zinc 9/25/2012 7:47:00 AM 0.10 mg/L 1 0.55 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 9/27/2012 0.02 mg/L 1 0.12 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 9/20/2012 5:24:00 PM 18 mg/L 3.57 < 18 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Tuesday, October 16, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 Q(a) Order No.: G1210291 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 10/4/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 16-Oct-12 Date: 

# Geochemical Testing
Project: Keystone 611 Q(a) CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1210291 

# CASE NARRATIVE

Samples were not filtered in the field for dissolved metals; samples were lab filtered. No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 Q(a) Client Sample ID: Outfall 101

Collection Date: 10/4/2012 1:00:00 PM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1210291
Lab ID: G1210291-001

DF 

# Geochemical Testing Date: 16-Oct-12

Received Date: 10/4/2012 5:16:46 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 10/5/2012 3:17:20 PM 1 mg/L 1 3 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 10/5/2012 3:16:50 PM 20 mg/L 1 22600 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 10/5/2012 11:32:00 A M 2 mg/L 1.5 < 2 25 Finish Date/Time 10/5/2012 11:32:00 A M 0 mg/L 1.5 1 0/10/2012 11:45 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 10/5/2012 4:08:00 PM 1000 mg/L 200 11900 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 10/9/2012 8:18:47 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 10/9/2012 8:18:47 PM 0.02 mg/L 1 0.16 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 10/9/2012 12:51:17 P M 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 10/9/2012 8:16:11 PM 0.1 mg/L 1 < 0.1 0 Arsenic 10/9/2012 8:16:11 PM 0.02 mg/L 1 < 0.02 0 Beryllium 10/9/2012 8:16:11 PM 0.001 mg/L 1 < 0.001 0.8 Boron 10/10/2012 2:07:00 P M 2.50 mg/L 50 191 0 Cadmium 10/9/2012 8:16:11 PM 0.002 mg/L 1 < 0.002 0 Chromium 10/9/2012 8:16:11 PM 0.01 mg/L 1 < 0.01 0 Copper 10/9/2012 8:16:11 PM 0.01 mg/L 1 < 0.01 0.1 Iron 10/9/2012 8:16:11 PM 0.05 mg/L 1 0.06 0 Lead 10/9/2012 8:16:11 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 10/9/2012 8:16:11 PM 0.01 mg/L 1 10.6 0 Nickel 10/9/2012 8:16:11 PM 0.01 mg/L 1 0.01 0 Selenium 10/9/2012 8:16:11 PM 0.02 mg/L 1 0.16 3.4 Silver 10/9/2012 8:16:11 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 10/9/2012 8:16:11 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 10/10/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 10/11/2012 8:07:00 A M 5 mg/L 1.06 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 Q(a) Client Sample ID: FGD Influent

Collection Date: 10/4/2012 12:45:00 PM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1210291
Lab ID: G1210291-002

DF 

# Geochemical Testing Date: 16-Oct-12

Received Date: 10/4/2012 5:16:46 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 10/5/2012 3:16:49 PM 200 mg/L 10 27600 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 10/5/2012 3:17:21 PM 100 mg/L 20 15000 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 10/5/2012 11:32:00 A M 6 mg/L 6 23 0 Finish Date/Time 10/5/2012 11:32:00 A M 0 mg/L 6 1 0/10/2012 11:45 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 10/5/2012 4:08:00 PM 1000 mg/L 200 15600 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 10/9/2012 8:26:36 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 10/9/2012 8:26:36 PM 0.02 mg/L 1 0.22 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 10/9/2012 12:53:31 P M 0.0002 mg/L 1 0.0008 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 10/9/2012 11:10:47 P M 1.0 mg/L 1 238 0 Arsenic 10/9/2012 11:10:47 P M 0.20 mg/L 1 1.67 0 Beryllium 10/9/2012 11:10:47 P M 0.010 mg/L 1 0.042 0 Boron 10/10/2012 2:20:00 P M 5.00 mg/L 10 339 0 Cadmium 10/9/2012 11:10:47 P M 0.020 mg/L 1 0.033 0 Chromium 10/9/2012 11:10:47 P M 0.10 mg/L 1 1.23 0 Copper 10/9/2012 11:10:47 P M 0.10 mg/L 1 0.92 0 Iron 10/9/2012 11:10:47 P M 0.50 mg/L 1 1280 0 Lead 10/9/2012 11:10:47 P M 0.20 mg/L 1 0.50 0 Manganese 10/9/2012 11:10:47 P M 0.10 mg/L 1 324 0 Nickel 10/9/2012 11:10:47 P M 0.10 mg/L 1 2.45 0 Selenium 10/11/2012 2:15:00 A M 0.20 mg/L 1 4.34 0 Silver 10/9/2012 11:10:47 P M 0.050 mg/L 1 < 0.050 0 Zinc 10/9/2012 11:10:47 P M 0.10 mg/L 1 2.95 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 10/10/2012 0.02 mg/L 1 1.20 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 10/11/2012 8:08:00 A M 19 mg/L 3.85 < 19 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Page 1 of 4 Wednesday , November 14, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Keystone 611 Q(b) Order No.: G1210429 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 10/9/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Ti m ot hy W . Ber gst r

esser Di r

ect orofTechni calSer vi ces

# Page 2 of 4 14-Nov-12 Date: 

# Geochemical Testing
Project: Keystone 611 Q(b) CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1210429 

# CASE NARRATIVE

REVISED REPORT: Oil & grease value changed for -001.
Samples were not filtered in the field for dissolved metals; samples were lab filtered. G1210429-001 did not pass QA review for B OD and was reanalyzed out of hold-time. No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit

# Page 3 of 4 Project: Keystone 611 Q(b) Client Sample ID: Outfall 101

Collection Date: 10/9/2012 10:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1210429
Lab ID: G1210429-001

DF 

# Geochemical Testing Date: 14-Nov-12

Received Date: 10/9/2012 5:28:29 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 10/10/2012 3:15:00 P M 5 mg/L 1 < 5 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 10/10/2012 3:15:00 P M 20 mg/L 1 22300 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day H 10/17/2012 8:25:00 A M 3 mg/L 3 < 3 25 Finish Date/Time H 10/17/2012 8:25:00 A M 0 mg/L 3 < 0 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 10/11/2012 10:31:00 A 1000 mg/L 200 13000 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 10/12/2012 6:41:00 A M 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 10/12/2012 6:41:00 A M 0.02 mg/L 1 0.21 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 10/11/2012 9:10:51 A M 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 10/13/2012 9:04:00 A M 0.1 mg/L 1 < 0.1 0 Arsenic 10/13/2012 9:04:00 A M 0.02 mg/L 1 < 0.02 0 Beryllium 10/13/2012 9:04:00 A M 0.001 mg/L 1 < 0.001 0.8 Boron 10/15/2012 9:00:04 P M 1.25 mg/L 25 226 0 Cadmium 10/13/2012 9:04:00 A M 0.002 mg/L 1 < 0.002 0 Chromium 10/13/2012 9:04:00 A M 0.01 mg/L 1 < 0.01 0 Copper 10/13/2012 9:04:00 A M 0.01 mg/L 1 < 0.01 0.1 Iron 10/13/2012 9:04:00 A M 0.05 mg/L 1 < 0.05 0 Lead 10/13/2012 9:04:00 A M 0.02 mg/L 1 < 0.02 0.1 Manganese 10/15/2012 9:02:39 P M 0.01 mg/L 1 13.6 0 Nickel 10/13/2012 9:04:00 A M 0.01 mg/L 1 < 0.01 0 Selenium 10/13/2012 9:04:00 A M 0.02 mg/L 1 0.18 3.4 Silver 10/13/2012 9:04:00 A M 0.005 mg/L 1 < 0.005 0.1 Zinc 10/13/2012 9:04:00 A M 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 10/16/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 10/12/2012 8:07:00 A M 5 mg/L 1 < 5 15

I.D. 56-00306 PA DEP

# Page 4 of 4 Project: Keystone 611 Q(b) Client Sample ID: FGD Influent

Collection Date: 10/9/2012 9:45:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1210429
Lab ID: G1210429-002

DF 

# Geochemical Testing Date: 14-Nov-12

Received Date: 10/9/2012 5:28:29 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 10/10/2012 3:15:00 P M 100 mg/L 5 22400 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 10/10/2012 3:15:00 P M 50 mg/L 10 710 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: KMW

BOD 5-day 10/10/2012 10:00:00 A 3 mg/L 3 12 0 Finish Date/Time 10/10/2012 10:00:00 A 0 mg/L 3 1 0/15/2012 10:45 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 10/11/2012 10:31:00 A 1000 mg/L 200 13200 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 10/12/2012 6:57:00 A M 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 10/12/2012 6:57:00 A M 0.02 mg/L 1 0.79 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 10/11/2012 9:12:29 A M 0.0002 mg/L 1 < 0.0002 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 10/12/2012 1:32:00 A M 1.0 mg/L 1 17.1 0 Arsenic 10/12/2012 1:32:00 A M 0.20 mg/L 1 < 0.20 0 Beryllium 10/12/2012 1:32:00 A M 0.010 mg/L 1 < 0.010 0 Boron 10/15/2012 7:11:22 P M 5.00 mg/L 10 311 0 Cadmium 10/12/2012 1:32:00 A M 0.020 mg/L 1 0.037 0 Chromium 10/12/2012 1:32:00 A M 0.10 mg/L 1 < 0.10 0 Copper 10/12/2012 1:32:00 A M 0.10 mg/L 1 < 0.10 0 Iron 10/12/2012 1:32:00 A M 0.50 mg/L 1 119 0 Lead 10/12/2012 1:32:00 A M 0.20 mg/L 1 < 0.20 0 Manganese 10/12/2012 1:32:00 A M 0.10 mg/L 1 289 0 Nickel 10/12/2012 1:32:00 A M 0.10 mg/L 1 1.35 0 Selenium 10/12/2012 1:32:00 A M 0.20 mg/L 1 1.24 0 Silver 10/12/2012 1:32:00 A M 0.050 mg/L 1 < 0.050 0 Zinc 10/12/2012 1:32:00 A M 0.10 mg/L 1 0.31 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 10/16/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 10/12/2012 8:03:00 A M 22 mg/L 4.35 < 22 0

I.D. 56-00306 PA DEP

# Wednesday, October 31, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1210954 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 10/19/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 31-Oct-12 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1210954 

# CASE NARRATIVE

Samples were not filtered in the field for dissolved metals; samples were lab filtered. No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 10/19/2012 9:45:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1210954
Lab ID: G1210954-001

DF 

# Geochemical Testing Date: 31-Oct-12

Received Date: 10/19/2012 1:46:04 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 10/19/2012 2:19:10 P M 1 mg/L 1 5 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 10/22/2012 3:15:00 P M 20 mg/L 1 19100 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: JS

BOD 5-day 10/19/2012 5:57:00 P M 2 mg/L 1.5 6 25 Finish Date/Time 10/19/2012 5:57:00 P M 0 mg/L 1.5 1 0/24/2012 17:25 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SEF

Chloride 10/23/2012 11:17:00 A 1000 mg/L 200 10000 0 

### INORGANIC METALS EPA 200.7 Analyst: JAS

Iron, dissolved 10/23/2012 2:44:00 P M 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 10/23/2012 2:44:00 P M 0.02 mg/L 1 0.09 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury ** 10/25/2012 2:10:16 P M 0.0050 mg/L 25 0.0092 0.004 

### INORGANIC METALS EPA 200.7 Analyst: AM

Aluminum 10/26/2012 3:35:00 P M 0.1 mg/L 1 < 0.1 0 Arsenic 10/26/2012 3:35:00 P M 0.02 mg/L 1 < 0.02 0 Beryllium 10/25/2012 8:40:00 P M 0.001 mg/L 1 < 0.001 0.8 Boron 10/26/2012 2:14:00 P M 1.00 mg/L 20 186 0 Cadmium 10/26/2012 3:35:00 P M 0.002 mg/L 1 < 0.002 0 Chromium 10/26/2012 3:35:00 P M 0.01 mg/L 1 < 0.01 0 Copper 10/25/2012 8:40:00 P M 0.01 mg/L 1 < 0.01 0.1 Iron 10/25/2012 8:40:00 P M 0.05 mg/L 1 < 0.05 0 Lead 10/26/2012 3:35:00 P M 0.02 mg/L 1 < 0.02 0.1 Manganese 10/25/2012 8:40:00 P M 0.01 mg/L 1 3.58 0 Nickel 10/25/2012 8:40:00 P M 0.01 mg/L 1 0.01 0 Selenium 10/25/2012 8:40:00 P M 0.02 mg/L 1 0.08 3.4 Silver 10/26/2012 3:35:00 P M 0.005 mg/L 1 < 0.005 0.1 Zinc 10/26/2012 3:35:00 P M 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 10/29/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 10/24/2012 7:17:00 A M 5 mg/L 1.06 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 10/19/2012 9:30:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1210954
Lab ID: G1210954-002

DF 

# Geochemical Testing Date: 31-Oct-12

Received Date: 10/19/2012 1:46:04 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 10/22/2012 3:15:00 P M 200 mg/L 10 24900 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 10/22/2012 3:15:00 P M 100 mg/L 20 220 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: JS

BOD 5-day 10/19/2012 5:57:00 P M 12 mg/L 12 62 0 Finish Date/Time 10/19/2012 5:57:00 P M 0 mg/L 12 1 0/24/2012 17:25 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SEF

Chloride 10/23/2012 11:17:00 A 1000 mg/L 200 10400 0 

### INORGANIC METALS USGS I-1230-85 Analyst: JS

Hexavalent Chromium 10/19/2012 3:35:00 P M 0.020 mg/L 1 < 0.020 0 

### INORGANIC METALS EPA 200.7 Analyst: JAS

Iron, dissolved 10/23/2012 2:48:00 P M 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 10/23/2012 2:48:00 P M 0.02 mg/L 1 0.12 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 10/24/2012 8:29:45 A M 0.0002 mg/L 1 0.0012 0 

### INORGANIC METALS EPA 200.7 Analyst: JAS

Aluminum 10/24/2012 3:56:00 P M 1.0 mg/L 1 453 0 Arsenic 10/24/2012 3:56:00 P M 0.20 mg/L 1 2.00 0 Beryllium 10/24/2012 3:56:00 P M 0.010 mg/L 1 0.070 0 Boron 10/29/2012 9:04:00 A M 5.00 mg/L 10 290 0 Cadmium 10/24/2012 3:56:00 P M 0.020 mg/L 1 < 0.020 0 Chromium 10/24/2012 3:56:00 P M 0.10 mg/L 1 2.06 0 Copper 10/27/2012 3:51:00 P M 0.10 mg/L 1 1.32 0 Iron 10/25/2012 1:10:00 P M 5.00 mg/L 10 2670 0 Lead 10/24/2012 3:56:00 P M 0.20 mg/L 1 0.78 0 Manganese 10/25/2012 1:10:00 P M 1.00 mg/L 10 289 0 Nickel 10/24/2012 3:56:00 P M 0.10 mg/L 1 3.11 0 Selenium 10/24/2012 3:56:00 P M 0.20 mg/L 1 4.95 0 Silver 10/24/2012 3:56:00 P M 0.050 mg/L 1 < 0.050 0 Zinc 10/24/2012 3:56:00 P M 0.10 mg/L 1 3.85 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 10/29/2012 0.02 mg/L 1 2.06 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 10/24/2012 7:24:00 A M 19 mg/L 3.7 < 19 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Tuesday, November 06, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1210B35 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 10/24/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 06-Nov-12 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1210B35 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 10/24/2012 10:00:00 A Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1210B35
Lab ID: G1210B35-001

DF 

# Geochemical Testing Date: 06-Nov-12

Received Date: 10/24/2012 6:24:36 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 10/25/2012 2:18:47 P M 1 mg/L 1 2 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 10/25/2012 2:19:47 P M 20 mg/L 1 19500 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 10/25/2012 9:50:00 A M 2 mg/L 1.5 3 25 Finish Date/Time 10/25/2012 9:50:00 A M 0 mg/L 1.5 1 0/30/2012 09:25 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SEF

Chloride 10/26/2012 10:07:00 A 1000 mg/L 200 12000 0 

### INORGANIC METALS EPA 200.7 Analyst: AM

Iron, dissolved 10/26/2012 2:53:00 P M 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 10/26/2012 2:53:00 P M 0.02 mg/L 1 0.14 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 10/25/2012 2:57:33 P M 0.0002 mg/L 1 0.0008 0.004 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 10/28/2012 11:09:00 P 0.1 mg/L 1 < 0.1 0 Arsenic 10/28/2012 11:09:00 P 0.02 mg/L 1 < 0.02 0 Beryllium 10/28/2012 11:09:00 P 0.001 mg/L 1 < 0.001 0.8 Boron 10/30/2012 3:39:00 P M 2.50 mg/L 50 213 0 Cadmium 10/28/2012 11:09:00 P 0.002 mg/L 1 < 0.002 0 Chromium 10/28/2012 11:09:00 P 0.01 mg/L 1 < 0.01 0 Copper 10/28/2012 11:09:00 P 0.01 mg/L 1 < 0.01 0.1 Iron 10/28/2012 11:09:00 P 0.05 mg/L 1 < 0.05 0 Lead 10/28/2012 11:09:00 P 0.02 mg/L 1 < 0.02 0.1 Manganese 10/28/2012 11:09:00 P 0.01 mg/L 1 16.1 0 Nickel 10/28/2012 11:09:00 P 0.01 mg/L 1 0.02 0 Selenium 10/28/2012 11:09:00 P 0.02 mg/L 1 0.10 3.4 Silver 10/28/2012 11:09:00 P 0.005 mg/L 1 < 0.005 0.1 Zinc 10/28/2012 11:09:00 P 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 10/30/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 10/29/2012 4:14:00 P M 5 mg/L 1.02 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 10/24/2012 9:45:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1210B35
Lab ID: G1210B35-002

DF 

# Geochemical Testing Date: 06-Nov-12

Received Date: 10/24/2012 6:24:36 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 10/25/2012 2:19:47 P M 200 mg/L 10 23000 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 10/25/2012 2:18:55 P M 100 mg/L 20 13300 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 10/25/2012 9:50:00 A M 12 mg/L 12 64 0 Finish Date/Time 10/25/2012 9:50:00 A M 0 mg/L 12 1 0/30/2012 09:25 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SEF

Chloride 10/26/2012 10:07:00 A 1000 mg/L 200 15100 0 

### INORGANIC METALS USGS I-1230-85 Analyst: CLS

Hexavalent Chromium 10/24/2012 7:18:00 P M 0.020 mg/L 1 < 0.020 0 

### INORGANIC METALS EPA 200.7 Analyst: AM

Iron, dissolved 10/26/2012 2:57:00 P M 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 10/26/2012 2:57:00 P M 0.02 mg/L 1 0.25 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 10/25/2012 3:02:30 P M 0.100 mg/L 500 0.418 0 

### INORGANIC METALS EPA 200.7 Analyst: JEK

Aluminum 11/1/2012 9:26:00 AM 1.0 mg/L 1 258 0 Arsenic 11/1/2012 9:26:00 AM 0.20 mg/L 1 1.49 0 Beryllium 11/1/2012 9:26:00 AM 0.010 mg/L 1 0.043 0 Boron 11/3/2012 3:31:00 AM 5.00 mg/L 10 328 0 Cadmium 11/1/2012 9:26:00 AM 0.020 mg/L 1 < 0.020 0 Chromium 11/1/2012 9:26:00 AM 0.10 mg/L 1 1.42 0 Copper 11/1/2012 9:26:00 AM 0.10 mg/L 1 0.71 0 Iron 11/1/2012 9:26:00 AM 0.50 mg/L 1 1440 0 Lead 11/1/2012 9:26:00 AM 0.20 mg/L 1 0.63 0 Manganese 11/1/2012 9:26:00 AM 0.10 mg/L 1 317 0 Nickel 11/1/2012 9:26:00 AM 0.10 mg/L 1 2.89 0 Selenium 11/1/2012 9:26:00 AM 0.20 mg/L 1 4.43 0 Silver 11/1/2012 9:26:00 AM 0.050 mg/L 1 < 0.050 0 Zinc 11/1/2012 9:26:00 AM 0.10 mg/L 1 2.94 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 11/2/2012 0.02 mg/L 1 1.42 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 10/29/2012 4:12:00 P M 19 mg/L 3.7 < 19 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Monday, November 12, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 M(a) Order No.: G1210D22 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 10/30/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 12-Nov-12 Date: 

# Geochemical Testing
Project: Keystone 611 M(a) CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1210D22 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 M(a) Client Sample ID: Outfall 101

Collection Date: 10/30/2012 9:45:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1210D22
Lab ID: G1210D22-001

DF 

# Geochemical Testing Date: 12-Nov-12

Received Date: 10/30/2012 5:17:09 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 10/31/2012 2:46:54 P M 5 mg/L 1 < 5 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 10/31/2012 2:48:28 P M 20 mg/L 1 23500 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 10/31/2012 8:10:00 A M 2 mg/L 1.5 10 25 Finish Date/Time 10/31/2012 8:10:00 A M 0 mg/L 1.5 11/5/2012 07:40 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SEF

Chloride 11/1/2012 7:51:00 AM 1000 mg/L 200 13500 0 

### INORGANIC METALS EPA 200.7 Analyst: JAS

Iron, dissolved 11/1/2012 7:15:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 11/1/2012 7:15:00 PM 0.02 mg/L 1 0.12 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 10/31/2012 1:33:51 P M 0.0002 mg/L 1 0.0003 0.004 

### INORGANIC METALS EPA 200.7 Analyst: AM

Aluminum 11/2/2012 10:12:00 P M 0.1 mg/L 1 < 0.1 0 Arsenic 11/2/2012 10:12:00 P M 0.02 mg/L 1 < 0.02 0 Beryllium 11/2/2012 10:12:00 P M 0.001 mg/L 1 < 0.001 0.8 Boron 11/6/2012 7:38:00 AM 2.50 mg/L 50 251 0 Cadmium 11/2/2012 10:12:00 P M 0.002 mg/L 1 < 0.002 0 Chromium 11/2/2012 10:12:00 P M 0.01 mg/L 1 < 0.01 0 Copper 11/2/2012 10:12:00 P M 0.01 mg/L 1 0.01 0.1 Iron 11/2/2012 10:12:00 P M 0.05 mg/L 1 0.11 0 Lead 11/2/2012 10:12:00 P M 0.02 mg/L 1 < 0.02 0.1 Manganese 11/2/2012 10:12:00 P M 0.01 mg/L 1 24.4 0 Nickel 11/2/2012 10:12:00 P M 0.01 mg/L 1 0.02 0 Selenium 11/2/2012 10:12:00 P M 0.02 mg/L 1 0.15 3.4 Silver 11/2/2012 10:12:00 P M 0.005 mg/L 1 < 0.005 0.1 Zinc 11/2/2012 10:12:00 P M 0.01 mg/L 1 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 11/6/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 10/31/2012 2:42:00 P M 5 mg/L 1.01 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 M(a) Client Sample ID: FGD Influent

Collection Date: 10/30/2012 9:30:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1210D22
Lab ID: G1210D22-002

DF 

# Geochemical Testing Date: 12-Nov-12

Received Date: 10/30/2012 5:17:09 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 10/31/2012 2:48:27 P M 200 mg/L 10 28900 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 10/31/2012 2:46:56 P M 100 mg/L 20 27000 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 10/31/2012 8:10:00 A M 30 mg/L 30 140 0 Finish Date/Time 10/31/2012 8:10:00 A M 0 mg/L 30 11/5/2012 07:40 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SEF

Chloride 11/1/2012 7:51:00 AM 1000 mg/L 200 18600 0 

### INORGANIC METALS EPA 200.7 Analyst: JAS

Iron, dissolved 11/1/2012 7:19:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 11/1/2012 7:19:00 PM 0.02 mg/L 1 1.20 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 10/31/2012 1:35:30 P M 0.100 mg/L 500 0.790 0 

### INORGANIC METALS EPA 200.7 Analyst: AM

Aluminum 11/8/2012 10:16:00 A M 1.0 mg/L 1 160 0 Arsenic 11/8/2012 10:16:00 A M 0.20 mg/L 1 1.28 0 Beryllium 11/8/2012 10:16:00 A M 0.010 mg/L 1 0.028 0 Boron 11/8/2012 12:28:10 P M 5.00 mg/L 10 189 0 Cadmium 11/8/2012 10:16:00 A M 0.020 mg/L 1 0.039 0 Chromium 11/8/2012 10:16:00 A M 0.10 mg/L 1 0.90 0 Copper 11/8/2012 10:16:00 A M 0.10 mg/L 1 0.51 0 Iron 11/8/2012 10:16:00 A M 0.50 mg/L 1 887 0 Lead 11/8/2012 10:16:00 A M 0.20 mg/L 1 0.44 0 Manganese 11/8/2012 10:16:00 A M 0.10 mg/L 1 170 0 Nickel 11/8/2012 10:16:00 A M 0.10 mg/L 1 1.62 0 Selenium 11/8/2012 10:16:00 A M 0.20 mg/L 1 3.31 0 Silver 11/8/2012 10:16:00 A M 0.050 mg/L 1 < 0.050 0 Zinc 11/8/2012 10:16:00 A M 0.10 mg/L 1 2.22 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 11/9/2012 0.02 mg/L 1 0.90 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 10/31/2012 2:49:00 P M 24 mg/L 4.76 < 24 0 NOTES: The pH of the sample was >2.

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Friday, November 16, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 M(b) Order No.: G1211316 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 11/7/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 16-Nov-12 Date: 

# Geochemical Testing
Project: Keystone 611 M(b) CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1211316 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 M(b) Client Sample ID: Outfall 101

Collection Date: 11/7/2012 10:25:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1211316
Lab ID: G1211316-001

DF 

# Geochemical Testing Date: 16-Nov-12

Received Date: 11/7/2012 5:43:37 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 11/8/2012 2:44:05 PM 5 mg/L 1 < 5 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 11/8/2012 2:43:35 PM 20 mg/L 1 17500 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 11/8/2012 9:10:00 AM 2 mg/L 1.5 < 2 25 Finish Date/Time 11/8/2012 9:10:00 AM 0 mg/L 1.5 1 1/13/2012 08:25 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 11/9/2012 10:43:00 A M 1000 mg/L 200 10900 0 

### INORGANIC METALS EPA 200.7 Analyst: MS

Iron, dissolved 11/8/2012 10:02:38 P M 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 11/12/2012 3:53:02 P M 0.02 mg/L 1 0.10 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 11/12/2012 9:31:29 A M 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: MS

Aluminum 11/8/2012 9:52:16 PM 0.1 mg/L 1 < 0.1 0 Arsenic 11/8/2012 9:52:16 PM 0.02 mg/L 1 < 0.02 0 Beryllium 11/8/2012 9:52:16 PM 0.001 mg/L 1 < 0.001 0.8 Boron 11/12/2012 3:50:28 P M 1.25 mg/L 25 190 0 Cadmium 11/8/2012 9:52:16 PM 0.002 mg/L 1 < 0.002 0 Chromium 11/8/2012 9:52:16 PM 0.01 mg/L 1 < 0.01 0 Copper 11/8/2012 9:52:16 PM 0.01 mg/L 1 < 0.01 0.1 Iron 11/8/2012 9:52:16 PM 0.05 mg/L 1 0.07 0 Lead 11/8/2012 9:52:16 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 11/8/2012 9:52:16 PM 0.01 mg/L 1 18.8 0 Nickel 11/8/2012 9:52:16 PM 0.01 mg/L 1 0.02 0 Selenium 11/8/2012 9:52:16 PM 0.02 mg/L 1 0.10 3.4 Silver 11/8/2012 9:52:16 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 11/8/2012 9:52:16 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 11/12/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 11/13/2012 3:01:00 P M 5 mg/L 1 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 M(b) Client Sample ID: FGD Influent

Collection Date: 11/7/2012 10:10:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1211316
Lab ID: G1211316-002

DF 

# Geochemical Testing Date: 16-Nov-12

Received Date: 11/7/2012 5:43:37 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 11/8/2012 2:43:35 PM 200 mg/L 10 34900 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 11/8/2012 2:44:05 PM 100 mg/L 20 29400 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 11/8/2012 9:10:00 AM 3 mg/L 3 18 0 Finish Date/Time 11/8/2012 9:10:00 AM 0 mg/L 3 1 1/13/2012 08:25 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 11/9/2012 10:43:00 A M 1000 mg/L 200 18700 0 

### INORGANIC METALS EPA 200.7 Analyst: MS

Iron, dissolved 11/8/2012 10:05:13 P M 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 11/12/2012 3:55:35 P M 0.02 mg/L 1 0.20 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 11/12/2012 9:33:06 A M 0.100 mg/L 500 0.770 0 

### INORGANIC METALS EPA 200.7 Analyst: MS

Aluminum 11/8/2012 4:40:30 PM 1.0 mg/L 1 544 0 Arsenic 11/8/2012 4:40:30 PM 0.20 mg/L 1 4.32 0 Beryllium 11/8/2012 4:40:30 PM 0.010 mg/L 1 0.071 0 Boron 11/8/2012 4:40:30 PM 0.50 mg/L 1 309 0 Cadmium 11/8/2012 4:40:30 PM 0.020 mg/L 1 0.041 0 Chromium 11/8/2012 4:40:30 PM 0.10 mg/L 1 2.50 0 Copper 11/8/2012 4:40:30 PM 0.10 mg/L 1 2.00 0 Iron 11/12/2012 3:45:20 P M 5.00 mg/L 10 3000 0 Lead 11/8/2012 4:40:30 PM 0.20 mg/L 1 0.86 0 Manganese 11/8/2012 4:40:30 PM 0.10 mg/L 1 332 0 Nickel 11/8/2012 4:40:30 PM 0.10 mg/L 1 4.13 0 Selenium 11/8/2012 4:40:30 PM 0.20 mg/L 1 7.57 0 Silver 11/8/2012 4:40:30 PM 0.050 mg/L 1 < 0.050 0 Zinc 11/8/2012 4:40:30 PM 0.10 mg/L 1 5.90 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 11/12/2012 0.02 mg/L 1 2.50 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 11/13/2012 3:05:00 P M 19 mg/L 3.85 < 19 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Tuesday, November 20, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1211472 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 11/13/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 20-Nov-12 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1211472 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 11/12/2012 9:45:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1211472
Lab ID: G1211472-001

DF 

# Geochemical Testing Date: 20-Nov-12

Received Date: 11/13/2012 9:35:18 AM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 11/13/2012 2:57:50 P M 1 mg/L 1 < 1 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 11/13/2012 2:57:13 P M 20 mg/L 1 22900 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 11/14/2012 7:55:00 A M 2 mg/L 1.5 < 2 25 Finish Date/Time 11/14/2012 7:55:00 A M 0 mg/L 1.5 1 1/19/2012 07:50 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 11/14/2012 9:12:00 A M 1000 mg/L 200 14200 0 

### INORGANIC METALS EPA 200.7 Analyst: MS

Iron, dissolved 11/15/2012 9:17:00 P M 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 11/15/2012 9:17:00 P M 0.02 mg/L 1 0.11 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 11/14/2012 8:58:40 A M 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: MS

Aluminum 11/15/2012 9:08:00 P M 0.1 mg/L 1 < 0.1 0 Arsenic 11/15/2012 9:08:00 P M 0.02 mg/L 1 < 0.02 0 Beryllium 11/15/2012 9:08:00 P M 0.001 mg/L 1 < 0.001 0.8 Boron 11/16/2012 1:18:51 P M 2.50 mg/L 50 231 0 Cadmium 11/15/2012 9:08:00 P M 0.002 mg/L 1 < 0.002 0 Chromium 11/15/2012 9:08:00 P M 0.01 mg/L 1 < 0.01 0 Copper 11/15/2012 9:08:00 P M 0.01 mg/L 1 < 0.01 0.1 Iron 11/15/2012 9:08:00 P M 0.05 mg/L 1 < 0.05 0 Lead 11/15/2012 9:08:00 P M 0.02 mg/L 1 < 0.02 0.1 Manganese 11/15/2012 9:08:00 P M 0.01 mg/L 1 15.8 0 Nickel 11/15/2012 9:08:00 P M 0.01 mg/L 1 0.01 0 Selenium 11/15/2012 9:08:00 P M 0.02 mg/L 1 0.12 3.4 Silver 11/15/2012 9:08:00 P M 0.005 mg/L 1 < 0.005 0.1 Zinc 11/15/2012 9:08:00 P M 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 11/16/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 11/15/2012 1:56:00 P M 5 mg/L 1.03 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 11/12/2012 9:30:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1211472
Lab ID: G1211472-002

DF 

# Geochemical Testing Date: 20-Nov-12

Received Date: 11/13/2012 9:35:18 AM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 11/13/2012 2:57:13 P M 200 mg/L 10 26400 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 11/13/2012 2:57:40 P M 100 mg/L 20 11600 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 11/14/2012 7:55:00 A M 3 mg/L 3 10 0 Finish Date/Time 11/14/2012 7:55:00 A M 0 mg/L 3 1 1/19/2012 07:50 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 11/14/2012 9:12:00 A M 1000 mg/L 200 13400 0 

### INORGANIC METALS USGS I-1230-85 Analyst: MMR

Hexavalent Chromium H 11/13/2012 11:00:00 A 0.020 mg/L 1 < 0.020 0 

### INORGANIC METALS EPA 200.7 Analyst: MS

Iron, dissolved 11/15/2012 9:42:00 P M 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 11/15/2012 9:42:00 P M 0.02 mg/L 1 0.30 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 11/14/2012 9:45:59 A M 0.100 mg/L 500 0.364 0 

### INORGANIC METALS EPA 200.7 Analyst: MS

Aluminum 11/16/2012 4:18:00 A M 1.0 mg/L 1 184 0 Arsenic 11/16/2012 4:18:00 A M 0.20 mg/L 1 1.73 0 Beryllium 11/16/2012 4:18:00 A M 0.010 mg/L 1 0.028 0 Boron 11/16/2012 12:55:45 P 5.00 mg/L 10 298 0 Cadmium 11/16/2012 4:18:00 A M 0.020 mg/L 1 0.038 0 Chromium 11/16/2012 4:18:00 A M 0.10 mg/L 1 1.03 0 Copper 11/16/2012 4:18:00 A M 0.10 mg/L 1 0.70 0 Iron 11/16/2012 4:18:00 A M 0.50 mg/L 1 973 0 Lead 11/16/2012 4:18:00 A M 0.20 mg/L 1 0.45 0 Manganese 11/16/2012 4:18:00 A M 0.10 mg/L 1 260 0 Nickel 11/16/2012 4:18:00 A M 0.10 mg/L 1 2.53 0 Selenium 11/16/2012 4:18:00 A M 0.20 mg/L 1 3.71 0 Silver 11/16/2012 4:18:00 A M 0.050 mg/L 1 < 0.050 0 Zinc 11/16/2012 4:18:00 A M 0.10 mg/L 1 2.56 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 11/16/2012 0.02 mg/L 1 1.03 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 11/15/2012 2:49:00 P M 19 mg/L 3.85 < 19 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Monday, December 03, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1211777 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 11/19/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 03-Dec-12 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1211777 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 11/19/2012 10:00:00 A Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1211777
Lab ID: G1211777-001

DF 

# Geochemical Testing Date: 03-Dec-12

Received Date: 11/19/2012 3:09:28 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 11/20/2012 11:01:49 A 1 mg/L 1 < 1 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 11/20/2012 11:02:23 A 100 mg/L 5 19900 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 11/21/2012 6:55:00 A M 2 mg/L 1.5 < 2 25 Finish Date/Time 11/21/2012 6:55:00 A M 0 mg/L 1.5 1 1/26/2012 07:02 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SEF

Chloride 11/20/2012 11:22:00 A 1000 mg/L 200 11900 0 

### INORGANIC METALS EPA 200.7 Analyst: AM

Iron, dissolved 11/26/2012 10:48:00 A 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 11/22/2012 1:08:00 P M 0.02 mg/L 1 0.08 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 11/26/2012 8:46:05 A M 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: JAS

Aluminum 11/26/2012 11:32:00 A 0.1 mg/L 1 < 0.1 0 Arsenic 11/26/2012 11:32:00 A 0.02 mg/L 1 < 0.02 0 Beryllium 11/26/2012 11:32:00 A 0.001 mg/L 1 < 0.001 0.8 Boron 11/27/2012 1:10:00 P M 2.50 mg/L 50 217 0 Cadmium 11/26/2012 11:32:00 A 0.002 mg/L 1 < 0.002 0 Chromium 11/26/2012 11:32:00 A 0.01 mg/L 1 < 0.01 0 Copper 11/26/2012 11:32:00 A 0.01 mg/L 1 < 0.01 0.1 Iron 11/26/2012 11:32:00 A 0.05 mg/L 1 < 0.05 0 Lead 11/26/2012 11:32:00 A 0.02 mg/L 1 < 0.02 0.1 Manganese 11/26/2012 11:32:00 A 0.01 mg/L 1 5.63 0 Nickel 11/26/2012 11:32:00 A 0.01 mg/L 1 0.01 0 Selenium 11/26/2012 11:32:00 A 0.02 mg/L 1 0.10 3.4 Silver 11/26/2012 11:32:00 A 0.005 mg/L 1 < 0.005 0.1 Zinc 11/26/2012 11:32:00 A 0.01 mg/L 1 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 11/28/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 11/26/2012 7:34:00 A M 5 mg/L 1 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 11/19/2012 9:50:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1211777
Lab ID: G1211777-002

DF 

# Geochemical Testing Date: 03-Dec-12

Received Date: 11/19/2012 3:09:28 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 11/20/2012 11:02:22 A 200 mg/L 10 23300 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 11/20/2012 11:01:48 A 100 mg/L 20 16600 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 11/21/2012 6:55:00 A M 3 mg/L 3 4 0 Finish Date/Time 11/21/2012 6:55:00 A M 0 mg/L 3 1 1/26/2012 07:02 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SEF

Chloride 11/20/2012 11:22:00 A 1000 mg/L 200 14700 0 

### INORGANIC METALS USGS I-1230-85 Analyst: HJC

Hexavalent Chromium 11/19/2012 3:52:00 P M 0.020 mg/L 1 < 0.020 0 

### INORGANIC METALS EPA 200.7 Analyst: AM

Iron, dissolved 11/26/2012 10:52:00 A 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 11/22/2012 1:22:00 P M 0.02 mg/L 1 0.15 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 11/26/2012 8:47:44 A M 0.100 mg/L 500 0.481 0 

### INORGANIC METALS EPA 200.7 Analyst: MS

Aluminum 11/22/2012 5:31:00 P M 1.0 mg/L 1 230 0 Arsenic 11/22/2012 5:31:00 P M 0.20 mg/L 1 1.73 0 Beryllium 11/22/2012 5:31:00 P M 0.010 mg/L 1 0.021 0 Boron 11/27/2012 1:03:00 P M 5.00 mg/L 10 317 0 Cadmium 11/26/2012 11:56:00 A 0.020 mg/L 1 < 0.020 0 Chromium 11/22/2012 5:31:00 P M 0.10 mg/L 1 1.24 0 Copper 11/22/2012 5:31:00 P M 0.10 mg/L 1 0.78 0 Iron 11/22/2012 5:31:00 P M 0.50 mg/L 1 850 0 Lead 11/22/2012 5:31:00 P M 0.20 mg/L 1 0.46 0 Manganese 11/22/2012 5:31:00 P M 0.10 mg/L 1 180 0 Nickel 11/22/2012 5:31:00 P M 0.10 mg/L 1 2.20 0 Selenium 11/22/2012 5:31:00 P M 0.20 mg/L 1 4.31 0 Silver 11/22/2012 5:31:00 P M 0.050 mg/L 1 < 0.050 0 Zinc 11/22/2012 5:31:00 P M 0.10 mg/L 1 2.62 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 11/28/2012 0.02 mg/L 1 1.24 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 11/26/2012 7:34:00 A M 24 mg/L 4.76 < 24 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Monday, December 10, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1211924 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 11/26/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 10-Dec-12 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1211924 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 11/26/2012 10:00:00 A Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1211924
Lab ID: G1211924-001

DF 

# Geochemical Testing Date: 10-Dec-12

Received Date: 11/26/2012 1:49:34 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 11/27/2012 11:55:31 A 1 mg/L 1 1 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 11/27/2012 11:55:48 A 100 mg/L 5 22000 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 11/28/2012 8:00:00 A M 2 mg/L 1.5 < 2 25 Finish Date/Time 11/28/2012 8:00:00 A M 0 mg/L 1.5 12/3/2012 07:05 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SEF

Chloride 11/27/2012 10:23:00 A 1000 mg/L 200 10800 0 

### INORGANIC METALS EPA 200.7 Analyst: JAS

Iron, dissolved 11/28/2012 10:24:17 A 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 11/28/2012 10:24:17 A 0.02 mg/L 1 0.05 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 11/28/2012 9:34:15 A M 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: JAS

Aluminum 11/28/2012 10:21:43 A 0.1 mg/L 1 < 0.1 0 Arsenic 11/28/2012 10:21:43 A 0.02 mg/L 1 < 0.02 0 Beryllium 11/28/2012 10:21:43 A 0.001 mg/L 1 < 0.001 0.8 Boron 11/30/2012 12:11:00 P 2.50 mg/L 50 264 0 Cadmium 11/28/2012 10:21:43 A 0.002 mg/L 1 < 0.002 0 Chromium 11/28/2012 10:21:43 A 0.01 mg/L 1 < 0.01 0 Copper 11/28/2012 10:21:43 A 0.01 mg/L 1 < 0.01 0.1 Iron 11/28/2012 10:21:43 A 0.05 mg/L 1 < 0.05 0 Lead 11/28/2012 10:21:43 A 0.02 mg/L 1 < 0.02 0.1 Manganese 11/28/2012 10:21:43 A 0.01 mg/L 1 3.43 0 Nickel 11/28/2012 10:21:43 A 0.01 mg/L 1 < 0.01 0 Selenium 11/28/2012 10:21:43 A 0.02 mg/L 1 0.05 3.4 Silver 11/28/2012 10:21:43 A 0.005 mg/L 1 < 0.005 0.1 Zinc 11/28/2012 10:21:43 A 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 11/30/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 11/28/2012 10:17:00 A 5 mg/L 1 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 11/26/2012 9:45:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1211924
Lab ID: G1211924-002

DF 

# Geochemical Testing Date: 10-Dec-12

Received Date: 11/26/2012 1:49:34 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 11/27/2012 11:55:48 A 200 mg/L 10 24700 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 11/27/2012 11:55:31 A 100 mg/L 20 6440 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 11/28/2012 8:00:00 A M 3 mg/L 3 5 0 Finish Date/Time 11/28/2012 8:00:00 A M 0 mg/L 3 12/3/2012 07:05 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SEF

Chloride 11/27/2012 10:23:00 A 1000 mg/L 200 11500 0 

### INORGANIC METALS USGS I-1230-85 Analyst: JS

Hexavalent Chromium 11/26/2012 2:00:00 P M 0.020 mg/L 1 < 0.020 0 

### INORGANIC METALS EPA 200.7 Analyst: JAS

Iron, dissolved 11/28/2012 10:26:51 A 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 11/28/2012 10:26:51 A 0.02 mg/L 1 0.07 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 11/28/2012 9:35:51 A M 0.100 mg/L 500 0.109 0 

### INORGANIC METALS EPA 200.7 Analyst: MS

Aluminum 11/29/2012 5:55:16 P M 1.0 mg/L 1 83.4 0 Arsenic 11/29/2012 5:55:16 P M 0.20 mg/L 1 0.45 0 Beryllium 11/29/2012 5:55:16 P M 0.010 mg/L 1 < 0.010 0 Boron 11/30/2012 1:45:00 P M 5.00 mg/L 10 381 0 Cadmium 11/29/2012 5:55:16 P M 0.020 mg/L 1 0.023 0 Chromium 11/29/2012 5:55:16 P M 0.10 mg/L 1 0.49 0 Copper 11/29/2012 5:55:16 P M 0.10 mg/L 1 0.63 0 Iron 11/29/2012 5:55:16 P M 0.50 mg/L 1 340 0 Lead 11/29/2012 5:55:16 P M 0.20 mg/L 1 < 0.20 0 Manganese 11/29/2012 5:55:16 P M 0.10 mg/L 1 145 0 Nickel 11/29/2012 5:55:16 P M 0.10 mg/L 1 1.34 0 Selenium 11/29/2012 5:55:16 P M 0.20 mg/L 1 1.04 0 Silver 11/29/2012 5:55:16 P M 0.050 mg/L 1 < 0.050 0 Zinc 11/29/2012 5:55:16 P M 0.10 mg/L 1 1.17 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 11/30/2012 0.02 mg/L 1 0.49 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 11/28/2012 10:15:00 A 19 mg/L 3.7 < 19 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Friday, December 14, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 M(a) Order No.: G1212106 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 4 sample(s) on 12/4/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 6

### 14-Dec-12 Date: 

# Geochemical Testing
Project: Keystone 611 M(a) CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1212106 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 6

### Project: Keystone 611 M(a) Client Sample ID: Outfall 101

Collection Date: 12/3/2012 8:45:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1212106
Lab ID: G1212106-001

DF 

# Geochemical Testing Date: 14-Dec-12

Received Date: 12/4/2012 6:09:55 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 12/5/2012 3:27:52 PM 5 mg/L 1 6 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 12/5/2012 2:30:00 PM 100 mg/L 5 18500 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 12/5/2012 8:00:00 AM 2 mg/L 1.5 2 25 Finish Date/Time 12/5/2012 8:00:00 AM 0 mg/L 1.5 1 2/10/2012 07:05 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 12/5/2012 2:28:00 PM 1000 mg/L 200 10600 0 

### INORGANIC METALS EPA 200.7 Analyst: AM

Iron, dissolved 12/6/2012 10:14:31 A M 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 12/6/2012 10:14:31 A M 0.02 mg/L 1 0.06 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 12/7/2012 8:03:39 AM 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: AM

Aluminum 12/6/2012 10:17:05 A M 0.1 mg/L 1 < 0.1 0 Arsenic 12/6/2012 10:17:05 A M 0.02 mg/L 1 < 0.02 0 Beryllium 12/6/2012 10:17:05 A M 0.001 mg/L 1 < 0.001 0.8 Boron 12/7/2012 12:23:00 P M 2.50 mg/L 50 231 0 Cadmium 12/6/2012 10:17:05 A M 0.002 mg/L 1 < 0.002 0 Chromium 12/6/2012 10:17:05 A M 0.01 mg/L 1 < 0.01 0 Copper 12/6/2012 10:17:05 A M 0.01 mg/L 1 < 0.01 0.1 Iron 12/6/2012 10:17:05 A M 0.05 mg/L 1 < 0.05 0 Lead 12/6/2012 10:17:05 A M 0.02 mg/L 1 < 0.02 0.1 Manganese 12/6/2012 10:17:05 A M 0.01 mg/L 1 3.06 0 Nickel 12/6/2012 10:17:05 A M 0.01 mg/L 1 < 0.01 0 Selenium 12/6/2012 10:17:05 A M 0.02 mg/L 1 0.06 3.4 Silver 12/6/2012 10:17:05 A M 0.005 mg/L 1 < 0.005 0.1 Zinc 12/6/2012 10:17:05 A M 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 12/12/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 12/6/2012 1:40:00 PM 5 mg/L 1.1 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 6

### Project: Keystone 611 M(a) Client Sample ID: FGD Influent

Collection Date: 12/3/2012 8:30:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1212106
Lab ID: G1212106-002

DF 

# Geochemical Testing Date: 14-Dec-12

Received Date: 12/4/2012 6:09:55 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 12/5/2012 2:30:00 PM 200 mg/L 10 19200 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 12/5/2012 3:27:57 PM 200 mg/L 40 22300 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 12/5/2012 8:00:00 AM 6 mg/L 6 21 0 Finish Date/Time 12/5/2012 8:00:00 AM 0 mg/L 6 1 2/10/2012 07:05 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 12/5/2012 2:28:00 PM 1000 mg/L 200 12000 0 

### INORGANIC METALS EPA 200.7 Analyst: AM

Iron, dissolved 12/6/2012 10:34:48 A M 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 12/6/2012 10:34:48 A M 0.02 mg/L 1 0.11 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 12/7/2012 8:05:17 AM 0.100 mg/L 500 0.308 0 

### INORGANIC METALS EPA 200.7 Analyst: MAS

Aluminum 12/10/2012 10:04:13 P 1.0 mg/L 1 350 0 Arsenic 12/10/2012 10:04:13 P 0.20 mg/L 1 1.73 0 Beryllium 12/10/2012 10:04:13 P 0.010 mg/L 1 0.029 0 Boron 12/12/2012 4:41:00 P M 5.00 mg/L 10 299 0 Cadmium 12/10/2012 10:04:13 P 0.020 mg/L 1 0.031 0 Chromium 12/10/2012 10:04:13 P 0.10 mg/L 1 1.78 0 Copper 12/10/2012 10:04:13 P 0.10 mg/L 1 1.90 0 Iron 12/10/2012 10:04:13 P 0.50 mg/L 1 1650 0 Lead 12/10/2012 10:04:13 P 0.20 mg/L 1 0.66 0 Manganese 12/10/2012 10:04:13 P 0.10 mg/L 1 211 0 Nickel 12/10/2012 10:04:13 P 0.10 mg/L 1 2.90 0 Selenium 12/10/2012 10:04:13 P 0.20 mg/L 1 3.72 0 Silver 12/10/2012 10:04:13 P 0.050 mg/L 1 < 0.050 0 Zinc 12/10/2012 10:04:13 P 0.10 mg/L 1 3.82 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 12/12/2012 0.02 mg/L 1 1.78 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 12/6/2012 1:42:00 PM 19 mg/L 3.85 < 19 0

I.D. 56-00306 PA DEP 

# Page 4 of 6

### Project: Keystone 611 M(a) Client Sample ID: Plum Creek

Collection Date: 12/3/2012 11:50:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1212106
Lab ID: G1212106-003

DF 

# Geochemical Testing Date: 14-Dec-12

Received Date: 12/4/2012 6:09:55 PM 

# Laboratory Results

Sampled By : Client

MCL
INORGANIC NON METALS SM 4500-CO2D Analyst: MBG

Bicarbonate 12/5/2012 4:41:00 PM 5 mg/L CaCO3 1 54 0 

### INORGANIC NON-METALS SM 4500-CO2 Analyst: MBG

Carbonate 12/5/2012 4:41:00 PM 5 mg/L CaCO3 1 < 5 0 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 12/5/2012 2:30:00 PM 20 mg/L 1 154 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 12/5/2012 3:27:57 PM 5 mg/L 1 < 5 0 

### INORGANIC NON-METALS ASTM D1067-06 Analyst: MBG

Alkalinity to pH 4.5 12/5/2012 4:41:00 PM 5 mg/L CaCO3 1 54 0 

### INORGANIC NON-METALS EPA 300.0 Analyst: MLR

Nitrate Nitrogen 12/4/2012 11:06:00 P M 0.05 mg/L as N 1 0.22 0 Nitrite Nitrogen 12/4/2012 11:06:00 P M 0.05 mg/L as N 1 < 0.05 0 Nitrate - Nitrite 12/4/2012 11:06:00 P M 0.05 mg/L as N 1 0.22 0 

### INORGANIC NON-METALS EPA 300.0 Analyst: MLR

Chloride 12/4/2012 11:06:00 P M 1 mg/L 1 9 0 Fluoride 12/4/2012 11:06:00 P M 0.1 mg/L 1 < 0.1 0 Sulfate 12/4/2012 11:06:00 P M 2 mg/L 1 49 0 

### INORGANIC NON-METALS EPA 350.1 Analyst: SLY

Ammonia Nitrogen - Distilled 12/5/2012 10:36:06 A M 0.10 mg/L as N 1 0.10 0 

### INORGANICS NON METALS SM 4500-SIO2 C Analyst: MLR

Silica, total 12/5/2012 3:56:00 PM 0.20 mg/L 1 2.9 0 

### INORGANIC METALS EPA 200.7 Analyst: AM

Barium 12/6/2012 10:37:27 A M 0.01 mg/L 1 0.05 0 Boron 12/6/2012 10:37:27 A M 0.05 mg/L 1 0.19 0 Calcium 12/6/2012 10:37:27 A M 0.1 mg/L 1 22.5 0 Iron 12/6/2012 10:37:27 A M 0.05 mg/L 1 0.27 0 Magnesium 12/6/2012 10:37:27 A M 0.1 mg/L 1 6.5 0 Manganese 12/6/2012 10:37:27 A M 0.01 mg/L 1 0.12 0 Potassium 12/6/2012 10:37:27 A M 0.5 mg/L 1 1.7 0 Sodium 12/7/2012 1:30:00 PM 0.2 mg/L 1 19.6 0 Strontium 12/6/2012 10:37:27 A M 0.01 mg/L 1 0.22 0 

### INDICATOR ORGANIC PARAMETERS SM 20 5310-C Analyst: MTM

Total Organic Carbon 12/11/2012 5:01:00 P M 0.5 mg/L 1 1.6 0

I.D. 56-00306 PA DEP 

# Page 5 of 6

### Project: Keystone 611 M(a) Client Sample ID: Crooked Creek

Collection Date: 12/3/2012 1:00:00 PM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1212106
Lab ID: G1212106-004

DF 

# Geochemical Testing Date: 14-Dec-12

Received Date: 12/4/2012 6:09:55 PM 

# Laboratory Results

Sampled By : Client

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 12/5/2012 2:30:00 PM 20 mg/L 1 384 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 12/5/2012 3:27:57 PM 5 mg/L 1 33 

### INORGANIC NON-METALS ASTM D1067-06 Analyst: MBG

Alkalinity to pH 4.5 12/5/2012 5:35:00 PM 5 mg/L CaCO3 1 97 0 

### INORGANIC NON-METALS EPA 300.0 Analyst: MLR

Nitrate Nitrogen 12/4/2012 11:56:00 P M 0.05 mg/L as N 1 0.42 0 Nitrite Nitrogen 12/4/2012 11:56:00 P M 0.05 mg/L as N 1 < 0.05 0 Nitrate - Nitrite 12/4/2012 11:56:00 P M 0.05 mg/L as N 1 0.42 0 

### INORGANIC NON-METALS EPA 300.0 Analyst: MLR

Chloride 12/4/2012 11:56:00 P M 1 mg/L 1 62 0 Sulfate 12/4/2012 11:56:00 P M 2 mg/L 1 111 0 

### INORGANICS NON METALS SM 4500-SIO2 C Analyst: MLR

Silica, total 12/5/2012 3:56:00 PM 0.20 mg/L 1 4.2 0 

### INORGANIC METALS EPA 200.7 Analyst: AM

Calcium 12/6/2012 10:40:01 A M 0.1 mg/L 1 42.8 0 Iron 12/6/2012 10:40:01 A M 0.05 mg/L 1 4.42 0 Magnesium 12/6/2012 10:40:01 A M 0.1 mg/L 1 11.2 0 Manganese 12/6/2012 10:40:01 A M 0.01 mg/L 1 0.36 0 Potassium 12/6/2012 10:40:01 A M 0.5 mg/L 1 2.7 0 Sodium 12/7/2012 1:35:00 PM 0.2 mg/L 1 82.4 0 

### INDICATOR ORGANIC PARAMETERS SM 20 5310-C Analyst: MTM

Total Organic Carbon 12/11/2012 8:42:00 P M 0.5 mg/L 1 1.9 0

I.D. 56-00306 PA DEP 

# Page 6 of 6

# Friday, December 14, 2012

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1212206 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 12/5/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 14-Dec-12 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1212206 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 12/5/2012 10:30:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1212206
Lab ID: G1212206-001

DF 

# Geochemical Testing Date: 14-Dec-12

Received Date: 12/5/2012 7:31:21 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 12/6/2012 3:36:18 PM 1 mg/L 1 10 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 12/6/2012 3:35:28 PM 100 mg/L 5 18700 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 12/6/2012 10:55:00 A M 2 mg/L 1.5 < 2 25 Finish Date/Time 12/6/2012 10:55:00 A M 0 mg/L 1.5 1 2/11/2012 09:55 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 12/6/2012 10:16:00 A M 1000 mg/L 200 9800 0 

### INORGANIC METALS EPA 200.7 Analyst: MAS

Iron, dissolved 12/10/2012 12:00:21 P 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 12/10/2012 12:00:21 P 0.02 mg/L 1 0.07 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 12/7/2012 10:09:52 A M 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: MAS

Aluminum 12/7/2012 7:15:00 PM 0.1 mg/L 1 < 0.1 0 Arsenic 12/7/2012 7:15:00 PM 0.02 mg/L 1 < 0.02 0 Beryllium 12/7/2012 7:15:00 PM 0.001 mg/L 1 < 0.001 0.8 Boron 12/10/2012 12:59:38 P 2.50 mg/L 50 198 0 Cadmium 12/7/2012 7:15:00 PM 0.002 mg/L 1 < 0.002 0 Chromium 12/7/2012 7:15:00 PM 0.01 mg/L 1 < 0.01 0 Copper 12/7/2012 7:15:00 PM 0.01 mg/L 1 < 0.01 0.1 Iron 12/7/2012 7:15:00 PM 0.05 mg/L 1 < 0.05 0 Lead 12/7/2012 7:15:00 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 12/7/2012 7:15:00 PM 0.01 mg/L 1 3.51 0 Nickel 12/7/2012 7:15:00 PM 0.01 mg/L 1 < 0.01 0 Selenium 12/7/2012 7:15:00 PM 0.02 mg/L 1 0.11 3.4 Silver 12/7/2012 7:15:00 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 12/7/2012 7:15:00 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 12/12/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 12/10/2012 5:50:00 P M 6 mg/L 1.28 < 6 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 12/5/2012 10:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1212206
Lab ID: G1212206-002

DF 

# Geochemical Testing Date: 14-Dec-12

Received Date: 12/5/2012 7:31:21 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 12/6/2012 3:35:28 PM 200 mg/L 10 23300 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 12/6/2012 3:36:11 PM 200 mg/L 40 14500 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 12/6/2012 10:55:00 A M 3 mg/L 3 13 0 Finish Date/Time 12/6/2012 10:55:00 A M 0 mg/L 3 1 2/11/2012 09:55 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 12/6/2012 10:16:00 A M 1000 mg/L 200 12100 0 

### INORGANIC METALS USGS I-1230-85 Analyst: SEF

Hexavalent Chromium 12/5/2012 7:53:00 PM 0.020 mg/L 1 < 0.020 0 

### INORGANIC METALS EPA 200.7 Analyst: MAS

Iron, dissolved 12/11/2012 7:32:20 P M 0.10 mg/L 2 < 0.10 0 Selenium, dissolved 12/11/2012 7:32:20 P M 0.04 mg/L 2 0.24 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 12/7/2012 10:11:31 A M 0.100 mg/L 500 0.242 0 

### INORGANIC METALS EPA 200.7 Analyst: MAS

Aluminum 12/10/2012 10:06:48 P 1.0 mg/L 1 222 0 Arsenic 12/10/2012 10:06:48 P 0.20 mg/L 1 1.13 0 Beryllium 12/10/2012 10:06:48 P 0.010 mg/L 1 0.019 0 Boron 12/12/2012 4:45:00 P M 5.00 mg/L 10 332 0 Cadmium 12/10/2012 10:06:48 P 0.020 mg/L 1 0.032 0 Chromium 12/10/2012 10:06:48 P 0.10 mg/L 1 1.15 0 Copper 12/10/2012 10:06:48 P 0.10 mg/L 1 1.43 0 Iron 12/10/2012 10:06:48 P 0.50 mg/L 1 1110 0 Lead 12/10/2012 10:06:48 P 0.20 mg/L 1 0.43 0 Manganese 12/10/2012 10:06:48 P 0.10 mg/L 1 217 0 Nickel 12/10/2012 10:06:48 P 0.10 mg/L 1 2.50 0 Selenium 12/10/2012 10:06:48 P 0.20 mg/L 1 2.60 0 Silver 12/10/2012 10:06:48 P 0.050 mg/L 1 < 0.050 0 Zinc 12/10/2012 10:06:48 P 0.10 mg/L 1 2.56 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 12/12/2012 0.02 mg/L 1 1.15 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 12/10/2012 5:50:00 P M 19 mg/L 3.7 < 19 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Wednesday, January 02, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 M(b) Order No.: G1212523 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 12/12/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 02-Jan-13 Date: 

# Geochemical Testing
Project: Keystone 611 M(b) CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1212523 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 M(b) Client Sample ID: Outfall 101

Collection Date: 12/12/2012 9:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1212523
Lab ID: G1212523-001

DF 

# Geochemical Testing Date: 02-Jan-13

Received Date: 12/12/2012 5:15:45 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 12/13/2012 3:01:20 P M 5 mg/L 1 8 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 12/13/2012 3:01:51 P M 100 mg/L 5 16200 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 12/13/2012 8:30:00 A M 2 mg/L 1.5 < 2 25 Finish Date/Time 12/13/2012 8:30:00 A M 0 mg/L 1.5 1 2/18/2012 07:40 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SEF

Chloride 12/13/2012 9:21:00 A M 1000 mg/L 200 9590 0 

### INORGANIC METALS EPA 200.7 Analyst: AM

Iron, dissolved 12/14/2012 11:16:00 P 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 12/14/2012 11:16:00 P 0.02 mg/L 1 0.11 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 12/17/2012 9:19:22 A M 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: AM

Aluminum 12/14/2012 11:03:00 P 0.1 mg/L 1 < 0.1 0 Arsenic 12/14/2012 11:03:00 P 0.02 mg/L 1 < 0.02 0 Beryllium 12/14/2012 11:03:00 P 0.001 mg/L 1 < 0.001 0.8 Boron 12/17/2012 11:42:33 A 2.50 mg/L 50 168 0 Cadmium 12/14/2012 11:03:00 P 0.002 mg/L 1 < 0.002 0 Chromium 12/14/2012 11:03:00 P 0.01 mg/L 1 < 0.01 0 Copper 12/14/2012 11:03:00 P 0.01 mg/L 1 < 0.01 0.1 Iron 12/14/2012 11:03:00 P 0.05 mg/L 1 < 0.05 0 Lead 12/14/2012 11:03:00 P 0.02 mg/L 1 < 0.02 0.1 Manganese 12/14/2012 11:03:00 P 0.01 mg/L 1 4.58 0 Nickel 12/14/2012 11:03:00 P 0.01 mg/L 1 < 0.01 0 Selenium 12/14/2012 11:03:00 P 0.02 mg/L 1 0.11 3.4 Silver 12/14/2012 11:03:00 P 0.005 mg/L 1 < 0.005 0.1 Zinc 12/14/2012 11:03:00 P 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 12/20/2012 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 12/13/2012 1:39:00 P M 5 mg/L 1 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 M(b) Client Sample ID: FGD Influent

Collection Date: 12/12/2012 9:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1212523
Lab ID: G1212523-002

DF 

# Geochemical Testing Date: 02-Jan-13

Received Date: 12/12/2012 5:15:45 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 12/13/2012 3:01:51 P M 200 mg/L 10 12400 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 12/13/2012 3:01:23 P M 200 mg/L 40 14100 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 12/13/2012 9:10:00 A M 3 mg/L 3 9 0 Finish Date/Time 12/13/2012 9:10:00 A M 0 mg/L 3 1 2/18/2012 08:30 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SEF

Chloride 12/13/2012 9:21:00 A M 1000 mg/L 200 8510 0 

### INORGANIC METALS EPA 200.7 Analyst: AM

Iron, dissolved 12/14/2012 11:48:00 P 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 12/14/2012 11:48:00 P 0.02 mg/L 1 0.26 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 12/17/2012 9:21:00 A M 0.100 mg/L 500 0.333 0 

### INORGANIC METALS EPA 200.7 Analyst: MS

Aluminum 12/19/2012 2:51:41 P M 1.0 mg/L 1 233 0 Arsenic 12/19/2012 2:51:41 P M 0.20 mg/L 1 1.57 0 Beryllium 12/19/2012 2:51:41 P M 0.010 mg/L 1 0.015 0 Boron 12/19/2012 2:51:41 P M 0.50 mg/L 1 182 0 Cadmium 12/19/2012 2:51:41 P M 0.020 mg/L 1 < 0.020 0 Chromium 12/19/2012 2:51:41 P M 0.10 mg/L 1 1.50 0 Copper 12/19/2012 2:51:41 P M 0.10 mg/L 1 1.28 0 Iron 12/19/2012 2:51:41 P M 0.50 mg/L 1 1310 0 Lead 12/20/2012 11:27:00 A 0.20 mg/L 1 0.55 0 Manganese 12/19/2012 2:51:41 P M 0.10 mg/L 1 163 0 Nickel 12/19/2012 2:51:41 P M 0.10 mg/L 1 2.58 0 Selenium 12/20/2012 11:27:00 A 0.20 mg/L 1 3.58 0 Silver 12/19/2012 2:51:41 P M 0.050 mg/L 1 < 0.050 0 Zinc 12/19/2012 2:51:41 P M 0.10 mg/L 1 2.86 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 1/2/2013 0.02 mg/L 1 1.50 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 12/13/2012 1:39:00 P M 23 mg/L 4.55 < 23 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Wednesday, January 02, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1212684 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 12/17/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 02-Jan-13 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1212684 

# CASE NARRATIVE

Samples were not filtered in the field for dissolved metals; samples were lab filtered. No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 12/17/2012 9:20:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1212684
Lab ID: G1212684-001

DF 

# Geochemical Testing Date: 02-Jan-13

Received Date: 12/17/2012 3:17:20 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 12/18/2012 2:08:53 P M 1 mg/L 1 < 1 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 12/18/2012 2:08:03 P M 20 mg/L 1 18000 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 12/19/2012 7:00:00 A M 2 mg/L 1.5 < 2 25 Finish Date/Time 12/19/2012 7:00:00 A M 0 mg/L 1.5 1 2/24/2012 06:07 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SEF

Chloride 12/18/2012 11:17:00 A 1000 mg/L 200 10300 0 

### INORGANIC METALS EPA 200.7 Analyst: MS

Iron, dissolved 12/19/2012 8:09:22 P M 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 12/19/2012 8:09:22 P M 0.02 mg/L 1 0.08 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 12/20/2012 10:51:54 A 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: MS

Aluminum 12/19/2012 8:06:47 P M 0.1 mg/L 1 < 0.1 0 Arsenic 12/19/2012 8:06:47 P M 0.02 mg/L 1 < 0.02 0 Beryllium 12/19/2012 8:06:47 P M 0.001 mg/L 1 < 0.001 0.8 Boron 12/20/2012 12:38:00 P 2.50 mg/L 50 217 0 Cadmium 12/19/2012 8:06:47 P M 0.002 mg/L 1 < 0.002 0 Chromium 12/19/2012 8:06:47 P M 0.01 mg/L 1 < 0.01 0 Copper 12/19/2012 8:06:47 P M 0.01 mg/L 1 < 0.01 0.1 Iron 12/19/2012 8:06:47 P M 0.05 mg/L 1 < 0.05 0 Lead 12/19/2012 8:06:47 P M 0.02 mg/L 1 < 0.02 0.1 Manganese 12/19/2012 8:06:47 P M 0.01 mg/L 1 5.96 0 Nickel 12/19/2012 8:06:47 P M 0.01 mg/L 1 < 0.01 0 Selenium 12/19/2012 8:06:47 P M 0.02 mg/L 1 0.07 3.4 Silver 12/19/2012 8:06:47 P M 0.005 mg/L 1 < 0.005 0.1 Zinc 12/19/2012 8:06:47 P M 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 1/2/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 12/19/2012 7:27:00 A M 5 mg/L 1 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 12/17/2012 9:10:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1212684
Lab ID: G1212684-002

DF 

# Geochemical Testing Date: 02-Jan-13

Received Date: 12/17/2012 3:17:20 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 12/18/2012 2:08:03 P M 200 mg/L 10 21500 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 12/18/2012 2:08:58 P M 5 mg/L 1 450 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 12/19/2012 7:00:00 A M 3 mg/L 3 14 0 Finish Date/Time 12/19/2012 7:00:00 A M 0 mg/L 3 1 2/24/2012 06:07 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SEF

Chloride 12/18/2012 11:17:00 A 1000 mg/L 200 13400 0 

### INORGANIC METALS USGS I-1230-85 Analyst: HJC

Hexavalent Chromium 12/17/2012 4:31:00 P M 0.020 mg/L 1 < 0.020 0 

### INORGANIC METALS EPA 200.7 Analyst: MS

Iron, dissolved 12/19/2012 8:11:58 P M 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 12/19/2012 8:11:58 P M 0.02 mg/L 1 0.13 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 12/20/2012 10:56:53 A 0.100 mg/L 500 0.308 0 

### INORGANIC METALS EPA 200.7 Analyst: MS

Aluminum 12/19/2012 10:58:47 P 1.0 mg/L 1 356 0 Arsenic 12/19/2012 10:58:47 P 0.20 mg/L 1 1.66 0 Beryllium 12/19/2012 10:58:47 P 0.010 mg/L 1 0.024 0 Boron 12/19/2012 10:58:47 P 0.50 mg/L 1 286 0 Cadmium 12/19/2012 10:58:47 P 0.020 mg/L 1 < 0.020 0 Chromium 12/19/2012 10:58:47 P 0.10 mg/L 1 1.71 0 Copper 12/19/2012 10:58:47 P 0.10 mg/L 1 1.49 0 Iron 12/19/2012 10:58:47 P 0.50 mg/L 1 1470 0 Lead 12/19/2012 10:58:47 P 0.20 mg/L 1 0.59 0 Manganese 12/19/2012 10:58:47 P 0.10 mg/L 1 254 0 Nickel 12/19/2012 10:58:47 P 0.10 mg/L 1 3.06 0 Selenium 12/19/2012 10:58:47 P 0.20 mg/L 1 3.44 0 Silver 12/19/2012 10:58:47 P 0.050 mg/L 1 < 0.050 0 Zinc 12/19/2012 10:58:47 P 0.10 mg/L 1 3.41 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 1/2/2013 0.02 mg/L 1 1.71 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 12/19/2012 7:24:00 A M 19 mg/L 3.85 < 19 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Friday, January04, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1212957 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 12/26/2012 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 04-Jan-13 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1212957 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 12/26/2012 10:30:00 A Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1212957
Lab ID: G1212957-001

DF 

# Geochemical Testing Date: 04-Jan-13

Received Date: 12/26/2012 5:37:03 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: GMG

Total suspended solids 12/27/2012 3:10:00 P M 1 mg/L 1 < 1 10 

### INORGANIC NON-METALS SM 2540 C Analyst: GMG

Total dissolved solids 12/27/2012 3:10:00 P M 20 mg/L 1 22600 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 12/26/2012 5:40:00 P M 2 mg/L 1.5 < 2 25 Finish Date/Time 12/26/2012 5:40:00 P M 0 mg/L 1.5 1 2/31/2012 16:40 0 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 12/27/2012 2:09:00 P M 1000 mg/L 200 14700 0 

### INORGANIC METALS EPA 200.7 Analyst: MS

Iron, dissolved 12/28/2012 3:14:06 P M 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 12/28/2012 3:14:06 P M 0.02 mg/L 1 0.10 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 12/27/2012 1:16:21 P M 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: MS

Aluminum 12/28/2012 3:06:20 P M 0.1 mg/L 1 < 0.1 0 Arsenic 12/28/2012 3:06:20 P M 0.02 mg/L 1 < 0.02 0 Beryllium 12/28/2012 3:06:20 P M 0.001 mg/L 1 < 0.001 0.8 Boron 12/28/2012 3:06:20 P M 0.05 mg/L 1 230 0 Cadmium 12/28/2012 3:06:20 P M 0.002 mg/L 1 < 0.002 0 Chromium 12/28/2012 3:06:20 P M 0.01 mg/L 1 < 0.01 0 Copper 12/28/2012 3:06:20 P M 0.01 mg/L 1 < 0.01 0.1 Iron 12/28/2012 3:06:20 P M 0.05 mg/L 1 < 0.05 0 Lead 12/28/2012 3:06:20 P M 0.02 mg/L 1 < 0.02 0.1 Manganese 12/28/2012 3:06:20 P M 0.01 mg/L 1 17.2 0 Nickel 12/28/2012 3:06:20 P M 0.01 mg/L 1 < 0.01 0 Selenium 12/28/2012 3:06:20 P M 0.02 mg/L 1 0.09 3.4 Silver 12/28/2012 3:06:20 P M 0.005 mg/L 1 < 0.005 0.1 Zinc 12/28/2012 3:06:20 P M 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 1/2/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 12/31/2012 4:48:00 P M 5 mg/L 1.04 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 12/26/2012 10:15:00 A Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1212957
Lab ID: G1212957-002

DF 

# Geochemical Testing Date: 04-Jan-13

Received Date: 12/26/2012 5:37:03 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: GMG

Total dissolved solids 12/27/2012 3:10:00 P M 200 mg/L 10 26600 0 

### PHYSICAL TESTS SM 2540D Analyst: GMG

Total suspended solids 12/27/2012 10:55:15 A 200 mg/L 40 24600 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 12/26/2012 5:40:00 P M 6 mg/L 6 24 0 Finish Date/Time 12/26/2012 5:40:00 P M 0 mg/L 6 1 2/31/2012 16:40 

### INORGANIC NON-METALS SM 4500-CL E Analyst: SAG

Chloride 12/27/2012 2:09:00 P M 1000 mg/L 200 16200 0 

### INORGANIC METALS USGS I-1230-85 Analyst: SEF

Hexavalent Chromium 12/26/2012 6:18:00 P M 0.020 mg/L 1 < 0.020 0 

### INORGANIC METALS EPA 200.7 Analyst: MS

Iron, dissolved 12/28/2012 3:16:40 P M 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 12/28/2012 3:16:40 P M 0.02 mg/L 1 0.29 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 12/27/2012 1:21:20 P M 0.100 mg/L 500 0.585 0 

### INORGANIC METALS EPA 200.7 Analyst: MS

Aluminum 12/28/2012 3:53:00 P M 1.0 mg/L 1 374 0 Arsenic 12/28/2012 3:53:00 P M 0.20 mg/L 1 1.64 0 Beryllium 12/28/2012 3:53:00 P M 0.010 mg/L 1 0.036 0 Boron 12/31/2012 2:44:00 P M 5.00 mg/L 10 286 0 Cadmium 12/28/2012 3:53:00 P M 0.020 mg/L 1 < 0.020 0 Chromium 12/28/2012 3:53:00 P M 0.10 mg/L 1 1.85 0 Copper 12/28/2012 3:53:00 P M 0.10 mg/L 1 1.35 0 Iron 12/28/2012 3:53:00 P M 0.50 mg/L 1 1650 0 Lead 12/28/2012 3:53:00 P M 0.20 mg/L 1 0.48 0 Manganese 12/28/2012 3:53:00 P M 0.10 mg/L 1 263 0 Nickel 12/28/2012 3:53:00 P M 0.10 mg/L 1 3.23 0 Selenium 12/28/2012 3:53:00 P M 0.20 mg/L 1 3.96 0 Silver 12/28/2012 3:53:00 P M 0.050 mg/L 1 < 0.050 0 Zinc 12/28/2012 3:53:00 P M 0.10 mg/L 1 3.55 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 1/2/2013 0.02 mg/L 1 1.85 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 12/31/2012 4:48:00 P M 19 mg/L 3.85 < 19 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Monday, January21, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 Q(a) Order No.: G1301069 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 7 sample(s) on 1/2/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 9

### 21-Jan-13 Date: 

# Geochemical Testing
Project: Keystone 611 Q(a) CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1301069 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 9

### Project: Keystone 611 Q(a) Client Sample ID: Outfall 101

Collection Date: 1/2/2013 11:40:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1301069
Lab ID: G1301069-001

DF 

# Geochemical Testing Date: 21-Jan-13

Received Date: 1/2/2013 5:13:04 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 1/3/2013 2:09:52 PM 1 mg/L 1 5 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 1/3/2013 2:29:21 PM 100 mg/L 5 22000 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 1/3/2013 10:45:00 AM 2 mg/L 1.5 < 2 25 Finish Date/Time 1/3/2013 10:45:00 AM 0 mg/L 1.5 1/8/2013 10:55 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 1/7/2013 3:10:00 PM 1000 mg/L 200 13900 

### INORGANIC METALS EPA 200.7 Analyst: MS

Iron, dissolved 1/3/2013 8:39:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 1/3/2013 8:39:00 PM 0.02 mg/L 1 0.12 0 

### INORGANIC METALS SM 3112B Analyst: MBG

Mercury 1/3/2013 4:47:37 PM 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: MS

Aluminum 1/3/2013 8:20:00 PM 0.1 mg/L 1 < 0.1 0 Arsenic 1/3/2013 8:20:00 PM 0.02 mg/L 1 < 0.02 0 Beryllium 1/3/2013 8:20:00 PM 0.001 mg/L 1 < 0.001 0.8 Boron 1/4/2013 10:06:45 AM 2.50 mg/L 50 264 0 Cadmium 1/3/2013 8:20:00 PM 0.002 mg/L 1 < 0.002 0 Chromium 1/3/2013 8:20:00 PM 0.01 mg/L 1 < 0.01 0 Copper 1/3/2013 8:20:00 PM 0.01 mg/L 1 < 0.01 0.1 Iron 1/3/2013 8:20:00 PM 0.05 mg/L 1 < 0.05 0 Lead 1/3/2013 8:20:00 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 1/3/2013 8:20:00 PM 0.01 mg/L 1 22.1 0 Nickel 1/3/2013 8:20:00 PM 0.01 mg/L 1 < 0.01 0 Selenium 1/3/2013 8:20:00 PM 0.02 mg/L 1 0.12 3.4 Silver 1/3/2013 8:20:00 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 1/3/2013 8:20:00 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 1/7/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 1/4/2013 2:41:00 PM 5 mg/L 1 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 9

### Project: Keystone 611 Q(a) Client Sample ID: FGD Influent

Collection Date: 1/2/2013 11:30:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1301069
Lab ID: G1301069-002

DF 

# Geochemical Testing Date: 21-Jan-13

Received Date: 1/2/2013 5:13:04 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 1/3/2013 2:29:21 PM 200 mg/L 10 27200 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 1/3/2013 2:09:51 PM 200 mg/L 40 3080 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 1/3/2013 10:45:00 AM 3 mg/L 3 17 0 Finish Date/Time 1/3/2013 10:45:00 AM 0 mg/L 3 1/8/2013 10:55 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 1/7/2013 3:10:00 PM 1000 mg/L 200 10300 

### INORGANIC METALS EPA 200.7 Analyst: MS

Iron, dissolved 1/3/2013 9:17:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 1/3/2013 9:17:00 PM 0.02 mg/L 1 0.92 0 

### INORGANIC METALS SM 3112B Analyst: MBG

Mercury 1/3/2013 4:49:14 PM 0.100 mg/L 500 < 0.100 0 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Aluminum 1/7/2013 6:05:00 PM 1.0 mg/L 1 91.3 0 Arsenic 1/7/2013 6:05:00 PM 0.20 mg/L 1 0.38 0 Beryllium 1/7/2013 6:05:00 PM 0.010 mg/L 1 < 0.010 0 Boron 1/8/2013 3:01:45 PM 5.00 mg/L 10 420 0 Cadmium 1/7/2013 6:05:00 PM 0.020 mg/L 1 0.032 0 Chromium 1/7/2013 6:05:00 PM 0.10 mg/L 1 0.34 0 Copper 1/7/2013 6:05:00 PM 0.10 mg/L 1 0.27 0 Iron 1/7/2013 6:05:00 PM 0.50 mg/L 1 328 0 Lead 1/7/2013 6:05:00 PM 0.20 mg/L 1 < 0.20 0 Manganese 1/7/2013 6:05:00 PM 0.10 mg/L 1 440 0 Nickel 1/7/2013 6:05:00 PM 0.10 mg/L 1 2.56 0 Selenium 1/7/2013 6:05:00 PM 0.20 mg/L 1 1.41 0 Silver 1/14/2013 11:53:15 A M 0.050 mg/L 1 < 0.050 0 Zinc 1/7/2013 6:05:00 PM 0.10 mg/L 1 0.86 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 1/9/2013 0.02 mg/L 1 0.34 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 1/4/2013 2:41:00 PM 18 mg/L 3.57 < 18 0

I.D. 56-00306 PA DEP 

# Page 4 of 9

### Project: Keystone 611 Q(a) Client Sample ID: Outfall 106

Collection Date: 1/2/2013 7:25:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1301069
Lab ID: G1301069-003

DF 

# Geochemical Testing Date: 21-Jan-13

Received Date: 1/2/2013 5:13:04 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 1/3/2013 2:09:51 PM 5 mg/L 1 < 5 30 

### INORGANIC METALS EPA 200.7 Analyst: MS

Aluminum 1/3/2013 9:36:00 PM 0.1 mg/L 1 < 0.1 0 Chromium 1/3/2013 9:36:00 PM 0.01 mg/L 1 < 0.01 0 Iron 1/3/2013 9:36:00 PM 0.05 mg/L 1 0.07 0 Manganese 1/3/2013 9:36:00 PM 0.01 mg/L 1 0.10 0 Nickel 1/3/2013 9:36:00 PM 0.01 mg/L 1 < 0.01 0 Titanium 1/3/2013 9:36:00 PM 0.005 mg/L 1 < 0.005 0 Zinc 1/3/2013 9:36:00 PM 0.01 mg/L 1 < 0.01 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 1/4/2013 2:42:00 PM 5 mg/L 1 < 5 15

I.D. 56-00306 PA DEP 

# Page 5 of 9

### Project: Keystone 611 Q(a) Client Sample ID: Plum Creek

Collection Date: 1/2/2013 7:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1301069
Lab ID: G1301069-004

DF 

# Geochemical Testing Date: 21-Jan-13

Received Date: 1/2/2013 5:13:04 PM 

# Laboratory Results

Sampled By : Client

MCL
INORGANIC NON METALS SM 4500-CO2D Analyst: AM

Bicarbonate 1/3/2013 7:53:00 AM 5 mg/L CaCO3 1 37 0 

### INORGANIC NON-METALS SM 4500-CO2 Analyst: AM

Carbonate 1/3/2013 7:53:00 AM 5 mg/L CaCO3 1 < 5 0 

### PH BY SM 4500 H+B SM4500-H+B Analyst: AM

Lab pH H 1/3/2013 7:53:00 AM 0 su 1 7.48 0 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 1/3/2013 2:29:21 PM 20 mg/L 1 130 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 1/3/2013 2:09:50 PM 5 mg/L 1 < 5 0 

### INORGANIC NON-METALS ASTM D1067-06 Analyst: AM

Alkalinity to pH 4.5 1/3/2013 7:53:00 AM 5 mg/L CaCO3 1 37 0 

### INORGANIC NON-METALS EPA 300.0 Analyst: MLR

Nitrate Nitrogen 1/2/2013 6:45:00 PM 0.05 mg/L as N 1 0.55 0 Nitrite Nitrogen 1/2/2013 6:45:00 PM 0.05 mg/L as N 1 < 0.05 0 Nitrate - Nitrite 1/2/2013 6:45:00 PM 0.05 mg/L as N 1 0.55 0 

### INORGANIC NON-METALS EPA 300.0 Analyst: MLR

Chloride 1/2/2013 6:45:00 PM 1 mg/L 1 10 0 Fluoride 1/2/2013 6:45:00 PM 0.1 mg/L 1 < 0.1 0 Sulfate 1/2/2013 6:45:00 PM 2 mg/L 1 34 0 

### INORGANIC NON-METALS EPA 350.1 Analyst: SLY

Ammonia Nitrogen - Distilled 1/15/2013 11:11:00 A M 0.10 mg/L as N 1 < 0.10 0 

### INORGANIC METALS EPA 200.7 Analyst: MS

Barium 1/3/2013 10:06:00 PM 0.01 mg/L 1 0.04 0 Boron 1/3/2013 10:06:00 PM 0.05 mg/L 1 0.06 0 Calcium 1/3/2013 10:06:00 PM 0.1 mg/L 1 18.6 0 Iron 1/3/2013 10:06:00 PM 0.05 mg/L 1 0.32 0 Magnesium 1/3/2013 10:06:00 PM 0.1 mg/L 1 5.5 0 Manganese 1/3/2013 10:06:00 PM 0.01 mg/L 1 0.12 0 Potassium 1/3/2013 10:06:00 PM 0.5 mg/L 1 1.3 0 Sodium 1/3/2013 10:06:00 PM 0.2 mg/L 1 12.9 0 Strontium 1/3/2013 10:06:00 PM 0.01 mg/L 1 0.15 0 

### INDICATOR ORGANIC PARAMETERS SM 20 5310-C Analyst: ACG

Total Organic Carbon 1/4/2013 6:24:00 PM 0.5 mg/L 1 1.4 0

I.D. 56-00306 PA DEP 

# Page 6 of 9

### Project: Keystone 611 Q(a) Client Sample ID: Crooked Creek

Collection Date: 1/2/2013 6:45:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1301069
Lab ID: G1301069-005

DF 

# Geochemical Testing Date: 21-Jan-13

Received Date: 1/2/2013 5:13:04 PM 

# Laboratory Results

Sampled By : Client

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 1/3/2013 2:29:21 PM 20 mg/L 1 198 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 1/3/2013 2:09:50 PM 10 mg/L 2 < 10 0 

### INORGANIC NON-METALS ASTM D1067-06 Analyst: AM

Alkalinity to pH 4.5 1/3/2013 9:59:00 AM 5 mg/L CaCO3 1 48 0 

### INORGANIC NON-METALS EPA 300.0 Analyst: MLR

Nitrate Nitrogen 1/2/2013 7:01:00 PM 0.05 mg/L as N 1 0.57 0 Nitrite Nitrogen 1/2/2013 7:01:00 PM 0.05 mg/L as N 1 < 0.05 0 Nitrate - Nitrite 1/2/2013 7:01:00 PM 0.05 mg/L as N 1 0.57 0 

### INORGANIC NON-METALS EPA 300.0 Analyst: MLR

Chloride 1/2/2013 7:01:00 PM 1 mg/L 1 27 0 Sulfate 1/2/2013 7:01:00 PM 2 mg/L 1 64 0 

### INORGANIC METALS EPA 200.7 Analyst: MS

Calcium 1/3/2013 10:19:00 PM 0.1 mg/L 1 27.6 0 Iron 1/3/2013 10:19:00 PM 0.05 mg/L 1 1.10 0 Magnesium 1/3/2013 10:19:00 PM 0.1 mg/L 1 7.4 0 Manganese 1/3/2013 10:19:00 PM 0.01 mg/L 1 0.20 0 Potassium 1/3/2013 10:19:00 PM 0.5 mg/L 1 1.7 0 Sodium 1/3/2013 10:19:00 PM 0.2 mg/L 1 31.1 0 

### INDICATOR ORGANIC PARAMETERS SM 20 5310-C Analyst: ACG

Total Organic Carbon 1/4/2013 10:05:00 PM 0.5 mg/L 1 1.3 0

I.D. 56-00306 PA DEP 

# Page 7 of 9

### Project: Keystone 611 Q(a) Client Sample ID: East Valley

Collection Date: 1/2/2013 8:26:00 AM Matrix: LEACHATE Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1301069
Lab ID: G1301069-006

DF 

# Geochemical Testing Date: 21-Jan-13

Received Date: 1/2/2013 5:13:04 PM 

# Laboratory Results

Sampled By : Client

MCL
INORGANIC NON-METALS ASTM D1067-06 Analyst: AM

Alkalinity to pH 4.5 1/3/2013 11:37:00 AM 5 mg/L CaCO3 1 90 0 

### INORGANIC METALS EPA 200.7 Analyst: MS

Iron 1/3/2013 10:24:00 PM 0.05 mg/L 1 83.5 0 Manganese 1/3/2013 10:24:00 PM 0.01 mg/L 1 4.76 0

I.D. 56-00306 PA DEP 

# Page 8 of 9

### Project: Keystone 611 Q(a) Client Sample ID: West Valley

Collection Date: 1/2/2013 7:55:00 AM Matrix: LEACHATE Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1301069
Lab ID: G1301069-007

DF 

# Geochemical Testing Date: 21-Jan-13

Received Date: 1/2/2013 5:13:04 PM 

# Laboratory Results

Sampled By : Client

MCL
INORGANIC NON-METALS ASTM D1067-06 Analyst: AM

Alkalinity to pH 4.5 1/3/2013 11:50:00 AM 5 mg/L CaCO3 1 9 0 

### INORGANIC METALS EPA 200.7 Analyst: MS

Iron 1/4/2013 10:25:13 AM 0.50 mg/L 10 574 0 Manganese 1/3/2013 10:37:00 PM 0.01 mg/L 1 15.8 0

I.D. 56-00306 PA DEP 

# Page 9 of 9

# Monday, January21, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 Q(b) Order No.: G1301273 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 1/7/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 21-Jan-13 Date: 

# Geochemical Testing
Project: Keystone 611 Q(b) CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1301273 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 Q(b) Client Sample ID: Outfall 101

Collection Date: 1/7/2013 8:50:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1301273
Lab ID: G1301273-001

DF 

# Geochemical Testing Date: 21-Jan-13

Received Date: 1/7/2013 2:28:15 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 1/8/2013 3:26:20 PM 5 mg/L 1 < 5 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 1/8/2013 3:26:33 PM 20 mg/L 1 24100 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 1/9/2013 7:40:00 AM 2 mg/L 1.5 < 2 25 Finish Date/Time 1/9/2013 7:40:00 AM 0 mg/L 1.5 1/14/2013 07:10 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 1/9/2013 2:42:00 PM 1000 mg/L 200 14100 

### INORGANIC METALS EPA 200.7 Analyst: MAS

Iron, dissolved 1/8/2013 6:26:10 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 1/8/2013 6:26:10 PM 0.02 mg/L 1 0.05 0 

### INORGANIC METALS SM 3112B Analyst: MBG

Mercury 1/9/2013 1:59:18 PM 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: MAS

Aluminum 1/8/2013 6:28:44 PM 0.1 mg/L 1 < 0.1 0 Arsenic 1/8/2013 6:28:44 PM 0.02 mg/L 1 < 0.02 0 Beryllium 1/8/2013 6:28:44 PM 0.001 mg/L 1 < 0.001 0.8 Boron 1/9/2013 3:40:00 PM 2.50 mg/L 50 276 0 Cadmium 1/8/2013 6:28:44 PM 0.002 mg/L 1 < 0.002 0 Chromium 1/8/2013 6:28:44 PM 0.01 mg/L 1 < 0.01 0 Copper 1/10/2013 11:50:54 P M 0.01 mg/L 1 < 0.01 0.1 Iron 1/8/2013 6:28:44 PM 0.05 mg/L 1 < 0.05 0 Lead 1/8/2013 6:28:44 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 1/8/2013 6:28:44 PM 0.01 mg/L 1 27.8 0 Nickel 1/8/2013 6:28:44 PM 0.01 mg/L 1 < 0.01 0 Selenium 1/8/2013 6:28:44 PM 0.02 mg/L 1 0.06 3.4 Silver 1/8/2013 6:28:44 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 1/8/2013 6:28:44 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 1/15/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 1/10/2013 12:16:00 P M 5 mg/L 1 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 Q(b) Client Sample ID: FGD Influent

Collection Date: 1/7/2013 8:40:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1301273
Lab ID: G1301273-002

DF 

# Geochemical Testing Date: 21-Jan-13

Received Date: 1/7/2013 2:28:15 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 1/8/2013 3:26:33 PM 200 mg/L 10 27100 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 1/8/2013 3:26:22 PM 200 mg/L 40 23700 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 1/9/2013 7:40:00 AM 3 mg/L 3 16 0 Finish Date/Time 1/9/2013 7:40:00 AM 0 mg/L 3 1/14/2013 07:10 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 1/9/2013 2:42:00 PM 1000 mg/L 200 15500 

### INORGANIC METALS EPA 200.7 Analyst: MAS

Iron, dissolved 1/8/2013 6:44:14 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 1/8/2013 6:44:14 PM 0.02 mg/L 1 0.04 0 

### INORGANIC METALS SM 3112B Analyst: MBG

Mercury 1/9/2013 2:00:55 PM 0.100 mg/L 500 0.430 0 

### INORGANIC METALS EPA 200.7 Analyst: MAS

Aluminum 1/11/2013 3:56:03 AM 1.0 mg/L 1 353 0 Arsenic 1/15/2013 12:00:15 P M 0.20 mg/L 1 2.07 0 Beryllium 1/11/2013 3:56:03 AM 0.010 mg/L 1 0.033 0 Boron 1/17/2013 2:54:00 PM 5.00 mg/L 10 423 0 Cadmium 1/11/2013 3:56:03 AM 0.020 mg/L 1 < 0.020 0 Chromium 1/11/2013 3:56:03 AM 0.10 mg/L 1 1.95 0 Copper 1/11/2013 3:56:03 AM 0.10 mg/L 1 1.84 0 Iron 1/11/2013 3:56:03 AM 0.50 mg/L 1 1600 0 Lead 1/11/2013 3:56:03 AM 0.20 mg/L 1 0.55 0 Manganese 1/11/2013 3:56:03 AM 0.10 mg/L 1 306 0 Nickel 1/11/2013 3:56:03 AM 0.10 mg/L 1 3.80 0 Selenium 1/11/2013 3:56:03 AM 0.20 mg/L 1 3.51 0 Silver 1/11/2013 3:56:03 AM 0.050 mg/L 1 < 0.050 0 Zinc 1/11/2013 3:56:03 AM 0.10 mg/L 1 3.49 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 1/15/2013 0.02 mg/L 1 1.95 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 1/10/2013 12:20:00 P M 19 mg/L 3.7 < 19 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Tuesday, January29, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1301605 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 1/14/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 29-Jan-13 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1301605 

# CASE NARRATIVE

Samples were not filtered in the field for dissolved metals; samples were lab filtered. No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 1/14/2013 8:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1301605
Lab ID: G1301605-001

DF 

# Geochemical Testing Date: 29-Jan-13

Received Date: 1/14/2013 4:07:54 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: GMG

Total suspended solids 1/15/2013 3:30:45 PM 1 mg/L 1 1 10 

### INORGANIC NON-METALS SM 2540 C Analyst: GMG

Total dissolved solids 1/15/2013 3:47:53 PM 20 mg/L 1 23400 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: KMW

BOD 5-day 1/16/2013 7:30:00 AM 2 mg/L 1.5 < 2 25 Finish Date/Time 1/16/2013 7:30:00 AM 0 mg/L 1.5 1/21/2013 07:00 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 1/15/2013 2:08:00 PM 1000 mg/L 200 12000 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 1/17/2013 5:07:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 1/17/2013 5:07:00 PM 0.02 mg/L 1 0.09 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 1/16/2013 8:45:08 AM 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 1/16/2013 7:41:53 PM 0.1 mg/L 1 < 0.1 0 Arsenic 1/16/2013 7:41:53 PM 0.02 mg/L 1 < 0.02 0 Beryllium 1/16/2013 7:41:53 PM 0.001 mg/L 1 < 0.001 0.8 Boron 1/18/2013 11:52:30 A M 2.50 mg/L 50 282 0 Cadmium 1/17/2013 5:49:00 PM 0.002 mg/L 1 < 0.002 0 Chromium 1/17/2013 5:49:00 PM 0.01 mg/L 1 < 0.01 0 Copper 1/16/2013 7:41:53 PM 0.01 mg/L 1 < 0.01 0.1 Iron 1/17/2013 5:49:00 PM 0.05 mg/L 1 < 0.05 0 Lead 1/16/2013 7:41:53 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 1/16/2013 7:41:53 PM 0.01 mg/L 1 18.4 0 Nickel 1/16/2013 7:41:53 PM 0.01 mg/L 1 < 0.01 0 Selenium 1/16/2013 7:41:53 PM 0.02 mg/L 1 0.06 3.4 Silver 1/16/2013 7:41:53 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 1/16/2013 7:41:53 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 1/25/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 1/17/2013 11:47:00 A M 5 mg/L 1.02 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 1/14/2013 8:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1301605
Lab ID: G1301605-002

DF 

# Geochemical Testing Date: 29-Jan-13

Received Date: 1/14/2013 4:07:54 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: GMG

Total dissolved solids 1/15/2013 3:47:53 PM 200 mg/L 10 33500 0 

### PHYSICAL TESTS SM 2540D Analyst: GMG

Total suspended solids 1/15/2013 3:30:44 PM 200 mg/L 40 21900 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: KMW

BOD 5-day 1/16/2013 7:30:00 AM 3 mg/L 3 10 0 Finish Date/Time 1/16/2013 7:30:00 AM 0 mg/L 3 1/21/2013 07:00 

### INORGANIC METALS USGS I-1230-85 Analyst: HJC

Hexavalent Chromium 1/14/2013 5:18:00 PM 0.020 mg/L 1 < 0.020 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 1/15/2013 2:08:00 PM 1000 mg/L 200 16900 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Iron, dissolved 1/17/2013 6:34:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 1/17/2013 6:34:00 PM 0.02 mg/L 1 0.21 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 1/16/2013 8:46:44 AM 0.100 mg/L 500 0.615 0 

### INORGANIC METALS EPA 200.7 Analyst: MBG

Aluminum 1/17/2013 4:10:38 AM 1.0 mg/L 1 502 0 Arsenic 1/17/2013 4:10:38 AM 0.20 mg/L 1 1.85 0 Beryllium 1/17/2013 4:10:38 AM 0.010 mg/L 1 0.038 0 Boron 1/17/2013 11:39:00 P M 5.00 mg/L 10 430 0 Cadmium 1/17/2013 4:10:38 AM 0.020 mg/L 1 0.048 0 Chromium 1/17/2013 4:10:38 AM 0.10 mg/L 1 2.49 0 Copper 1/17/2013 4:10:38 AM 0.10 mg/L 1 1.87 0 Iron 1/17/2013 4:10:38 AM 0.50 mg/L 1 1790 0 Lead 1/17/2013 4:10:38 AM 0.20 mg/L 1 0.28 0 Manganese 1/17/2013 4:10:38 AM 0.10 mg/L 1 343 0 Nickel 1/17/2013 4:10:38 AM 0.10 mg/L 1 3.74 0 Selenium 1/17/2013 4:10:38 AM 0.20 mg/L 1 6.16 0 Silver 1/17/2013 4:10:38 AM 0.050 mg/L 1 < 0.050 0 Zinc 1/17/2013 4:10:38 AM 0.10 mg/L 1 3.89 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 1/25/2013 0.02 mg/L 1 2.49 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 1/17/2013 12:47:00 P M 19 mg/L 3.7 < 19 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Thursday, January31, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1301925 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 1/21/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 31-Jan-13 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1301925 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 1/21/2013 8:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1301925
Lab ID: G1301925-001

DF 

# Geochemical Testing Date: 31-Jan-13

Received Date: 1/21/2013 5:01:00 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 1/22/2013 2:34:02 PM 1 mg/L 1 5 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 1/22/2013 2:42:41 PM 20 mg/L 1 23100 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 1/23/2013 7:50:00 AM 2 mg/L 1.5 < 2 25 Finish Date/Time 1/23/2013 7:50:00 AM 0 mg/L 1.5 1/28/2013 08:05 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 1/23/2013 11:58:00 A M 1000 mg/L 200 14400 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Iron, dissolved 1/23/2013 3:43:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 1/23/2013 3:43:00 PM 0.02 mg/L 1 0.10 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 1/24/2013 2:02:35 PM 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Aluminum 1/23/2013 3:23:00 PM 0.1 mg/L 1 < 0.1 0 Arsenic 1/23/2013 3:23:00 PM 0.02 mg/L 1 < 0.02 0 Beryllium 1/23/2013 3:23:00 PM 0.001 mg/L 1 < 0.001 0.8 Boron 1/24/2013 2:10:00 PM 2.50 mg/L 50 312 0 Cadmium 1/23/2013 3:23:00 PM 0.002 mg/L 1 < 0.002 0 Chromium 1/23/2013 3:23:00 PM 0.01 mg/L 1 < 0.01 0 Copper 1/23/2013 3:23:00 PM 0.01 mg/L 1 < 0.01 0.1 Iron 1/23/2013 3:23:00 PM 0.05 mg/L 1 < 0.05 0 Lead 1/23/2013 3:23:00 PM 0.02 mg/L 1 0.02 0.1 Manganese 1/23/2013 3:23:00 PM 0.01 mg/L 1 27.4 0 Nickel 1/23/2013 3:23:00 PM 0.01 mg/L 1 < 0.01 0 Selenium 1/23/2013 3:23:00 PM 0.02 mg/L 1 0.08 3.4 Silver 1/23/2013 3:23:00 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 1/23/2013 3:23:00 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 1/25/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 1/23/2013 10:55:00 A M 5 mg/L 1 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 1/21/2013 8:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1301925
Lab ID: G1301925-002

DF 

# Geochemical Testing Date: 31-Jan-13

Received Date: 1/21/2013 5:01:00 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 1/22/2013 2:42:41 PM 200 mg/L 10 25500 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 1/22/2013 2:34:05 PM 200 mg/L 40 2360 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 1/23/2013 7:50:00 AM 3 mg/L 3 5 0 Finish Date/Time 1/23/2013 7:50:00 AM 0 mg/L 3 1/28/2013 08:05 

### INORGANIC METALS USGS I-1230-85 Analyst: JS

Hexavalent Chromium 1/21/2013 5:31:00 PM 0.020 mg/L 1 < 0.020 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 1/23/2013 11:58:00 A M 1000 mg/L 200 14100 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Iron, dissolved 1/23/2013 3:52:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 1/23/2013 3:52:00 PM 0.02 mg/L 1 0.23 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 1/24/2013 1:42:58 PM 0.100 mg/L 500 < 0.100 0 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Aluminum 1/23/2013 11:48:00 P M 1.0 mg/L 1 28.1 0 Arsenic 1/23/2013 11:48:00 P M 0.20 mg/L 1 < 0.20 0 Beryllium 1/23/2013 11:48:00 P M 0.010 mg/L 1 < 0.010 0 Boron 1/24/2013 10:30:00 P M 5.00 mg/L 10 466 0 Cadmium 1/23/2013 11:48:00 P M 0.020 mg/L 1 0.035 0 Chromium 1/23/2013 11:48:00 P M 0.10 mg/L 1 < 0.10 0 Copper 1/23/2013 11:48:00 P M 0.10 mg/L 1 < 0.10 0 Iron 1/23/2013 11:48:00 P M 0.50 mg/L 1 44.6 0 Lead 1/23/2013 11:48:00 P M 0.20 mg/L 1 < 0.20 0 Manganese 1/23/2013 11:48:00 P M 0.10 mg/L 1 300 0 Nickel 1/23/2013 11:48:00 P M 0.10 mg/L 1 2.01 0 Selenium 1/23/2013 11:48:00 P M 0.20 mg/L 1 0.65 0 Silver 1/23/2013 11:48:00 P M 0.050 mg/L 1 < 0.050 0 Zinc 1/23/2013 11:48:00 P M 0.10 mg/L 1 0.20 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 1/25/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 1/23/2013 10:55:00 A M 18 mg/L 3.57 < 18 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Monday, February11, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1301C38 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 1/29/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 11-Feb-13 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1301C38 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 1/29/2013 9:30:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1301C38
Lab ID: G1301C38-001

DF 

# Geochemical Testing Date: 11-Feb-13

Received Date: 1/29/2013 5:07:22 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: MBG

Total suspended solids 1/30/2013 5:55:14 PM 1 mg/L 1 1 10 

### INORGANIC NON-METALS SM 2540 C Analyst: MBG

Total dissolved solids 1/30/2013 6:10:24 PM 100 mg/L 5 24100 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: KMW

BOD 5-day 1/30/2013 9:15:00 AM 2 mg/L 1.5 < 2 25 Finish Date/Time 1/30/2013 9:15:00 AM 0 mg/L 1.5 2/4/2013 09:15 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 1/30/2013 9:50:00 AM 1000 mg/L 200 14700 

### INORGANIC METALS EPA 200.7 Analyst: JEK

Iron, dissolved 2/7/2013 5:11:54 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 2/7/2013 5:11:54 PM 0.02 mg/L 1 0.08 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 1/31/2013 11:58:04 A M 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: MAS

Aluminum 1/30/2013 5:17:49 PM 0.1 mg/L 1 < 0.1 0 Arsenic 1/30/2013 5:17:49 PM 0.02 mg/L 1 < 0.02 0 Beryllium 1/30/2013 5:17:49 PM 0.001 mg/L 1 < 0.001 0.8 Boron 1/31/2013 1:52:32 PM 2.50 mg/L 50 297 0 Cadmium 1/30/2013 5:17:49 PM 0.002 mg/L 1 < 0.002 0 Chromium 1/30/2013 5:17:49 PM 0.01 mg/L 1 < 0.01 0 Copper 1/30/2013 5:17:49 PM 0.01 mg/L 1 0.01 0.1 Iron 1/30/2013 5:17:49 PM 0.05 mg/L 1 < 0.05 0 Lead 1/30/2013 5:17:49 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 1/30/2013 5:17:49 PM 0.01 mg/L 1 35.6 0 Nickel 1/30/2013 5:17:49 PM 0.01 mg/L 1 < 0.01 0 Selenium 1/30/2013 5:17:49 PM 0.02 mg/L 1 0.10 3.4 Silver 1/30/2013 5:17:49 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 1/30/2013 5:17:49 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 2/4/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 1/30/2013 2:57:00 PM 5 mg/L 1 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 1/29/2013 9:20:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1301C38
Lab ID: G1301C38-002

DF 

# Geochemical Testing Date: 11-Feb-13

Received Date: 1/29/2013 5:07:22 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: MBG

Total dissolved solids 1/30/2013 6:10:24 PM 200 mg/L 10 29700 0 

### PHYSICAL TESTS SM 2540D Analyst: MBG

Total suspended solids 1/30/2013 5:55:17 PM 200 mg/L 40 21900 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: KMW

BOD 5-day 1/30/2013 9:15:00 AM 3 mg/L 3 18 0 Finish Date/Time 1/30/2013 9:15:00 AM 0 mg/L 3 2/4/2013 09:15 

### INORGANIC METALS USGS I-1230-85 Analyst: CLS

Hexavalent Chromium 1/29/2013 6:25:00 PM 0.020 mg/L 1 < 0.020 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 1/30/2013 9:50:00 AM 1000 mg/L 200 16900 

### INORGANIC METALS EPA 200.7 Analyst: MAS

Iron, dissolved 1/31/2013 3:58:51 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 1/31/2013 3:58:51 PM 0.02 mg/L 1 0.06 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 1/31/2013 11:59:43 A M 0.100 mg/L 500 0.705 0 

### INORGANIC METALS EPA 200.7 Analyst: JEK

Aluminum 2/4/2013 9:02:45 PM 1.0 mg/L 1 414 0 Arsenic 2/4/2013 9:02:45 PM 0.20 mg/L 1 2.87 0 Beryllium 2/4/2013 9:02:45 PM 0.010 mg/L 1 0.055 0 Boron 2/5/2013 1:53:55 PM 5.00 mg/L 10 425 0 Cadmium 2/4/2013 9:02:45 PM 0.020 mg/L 1 0.059 0 Chromium 2/4/2013 9:02:45 PM 0.10 mg/L 1 2.75 0 Copper 2/4/2013 9:02:45 PM 0.10 mg/L 1 2.13 0 Iron 2/5/2013 1:53:55 PM 5.00 mg/L 10 2770 0 Lead 2/4/2013 9:02:45 PM 0.20 mg/L 1 0.97 0 Manganese 2/4/2013 9:02:45 PM 0.10 mg/L 1 431 0 Nickel 2/4/2013 9:02:45 PM 0.10 mg/L 1 4.31 0 Selenium 2/4/2013 9:02:45 PM 0.20 mg/L 1 5.95 0 Silver 2/4/2013 9:02:45 PM 0.050 mg/L 1 < 0.050 0 Zinc 2/4/2013 9:02:45 PM 0.10 mg/L 1 4.89 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 2/8/2013 0.02 mg/L 1 2.75 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 1/31/2013 8:24:00 AM 19 mg/L 3.85 < 19 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Monday, February18, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 M(a) Order No.: G1302131 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 4 sample(s) on 2/5/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 6

### 18-Feb-13 Date: 

# Geochemical Testing
Project: Keystone 611 M(a) CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1302131 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 6

### Project: Keystone 611 M(a) Client Sample ID: Outfall 101

Collection Date: 2/5/2013 10:30:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1302131
Lab ID: G1302131-001

DF 

# Geochemical Testing Date: 18-Feb-13

Received Date: 2/5/2013 6:34:16 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: AM

Total suspended solids 2/6/2013 3:34:01 PM 5 mg/L 1 < 5 10 

### INORGANIC NON-METALS SM 2540 C Analyst: AM

Total dissolved solids 2/6/2013 3:24:37 PM 20 mg/L 1 26900 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: KMW

BOD 5-day 2/6/2013 9:30:00 AM 2 mg/L 1.5 < 2 25 Finish Date/Time 2/6/2013 9:30:00 AM 0 mg/L 1.5 2/11/2013 08:35 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: CLS

Chloride 2/6/2013 11:49:00 AM 1000 mg/L 200 14400 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Iron, dissolved 2/6/2013 8:40:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 2/6/2013 8:40:00 PM 0.02 mg/L 1 0.12 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 2/7/2013 10:42:43 AM 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Aluminum 2/6/2013 9:27:00 PM 0.1 mg/L 1 < 0.1 0 Arsenic 2/6/2013 9:27:00 PM 0.02 mg/L 1 < 0.02 0 Beryllium 2/6/2013 9:27:00 PM 0.001 mg/L 1 < 0.001 0.8 Boron 2/7/2013 12:55:32 PM 2.50 mg/L 50 302 0 Cadmium 2/6/2013 9:27:00 PM 0.002 mg/L 1 < 0.002 0 Chromium 2/6/2013 9:27:00 PM 0.01 mg/L 1 < 0.01 0 Copper 2/6/2013 9:27:00 PM 0.01 mg/L 1 < 0.01 0.1 Iron 2/6/2013 9:27:00 PM 0.05 mg/L 1 0.05 0 Lead 2/6/2013 9:27:00 PM 0.02 mg/L 1 0.03 0.1 Manganese 2/7/2013 12:58:06 PM 0.20 mg/L 20 111 0 Nickel 2/6/2013 9:27:00 PM 0.01 mg/L 1 0.02 0 Selenium 2/6/2013 9:27:00 PM 0.02 mg/L 1 0.12 3.4 Silver 2/6/2013 9:27:00 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 2/6/2013 9:27:00 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 2/8/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 2/6/2013 2:02:00 PM 5 mg/L 1.02 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 6

### Project: Keystone 611 M(a) Client Sample ID: FGD Influent

Collection Date: 2/5/2013 10:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1302131
Lab ID: G1302131-002

DF 

# Geochemical Testing Date: 18-Feb-13

Received Date: 2/5/2013 6:34:16 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: AM

Total dissolved solids 2/6/2013 3:24:38 PM 200 mg/L 10 34300 0 

### PHYSICAL TESTS SM 2540D Analyst: AM

Total suspended solids 2/6/2013 3:34:02 PM 200 mg/L 40 24200 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: KMW

BOD 5-day 2/6/2013 9:30:00 AM 3 mg/L 3 22 0 Finish Date/Time 2/6/2013 9:30:00 AM 0 mg/L 3 2/11/2013 08:35 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: CLS

Chloride 2/6/2013 11:49:00 AM 1000 mg/L 200 18500 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Iron, dissolved 2/6/2013 11:04:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 2/6/2013 11:04:00 PM 0.02 mg/L 1 0.29 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 2/7/2013 10:50:57 AM 0.100 mg/L 500 0.540 0 

### INORGANIC METALS EPA 200.7 Analyst: JAS

Aluminum 2/11/2013 10:17:10 P M 1.0 mg/L 1 468 0 Arsenic 2/11/2013 10:17:10 P M 0.20 mg/L 1 2.18 0 Beryllium 2/11/2013 10:17:10 P M 0.010 mg/L 1 0.055 0 Boron 2/12/2013 5:42:03 PM 5.00 mg/L 10 475 0 Cadmium 2/12/2013 5:44:37 PM 0.020 mg/L 1 0.033 0 Chromium 2/11/2013 10:17:10 P M 0.10 mg/L 1 2.71 0 Copper 2/11/2013 10:17:10 P M 0.10 mg/L 1 2.10 0 Iron 2/12/2013 5:42:03 PM 5.00 mg/L 10 2490 0 Lead 2/12/2013 5:44:37 PM 0.20 mg/L 1 0.48 0 Manganese 2/12/2013 5:42:03 PM 1.00 mg/L 10 485 0 Nickel 2/11/2013 10:17:10 P M 0.10 mg/L 1 5.05 0 Selenium 2/11/2013 10:17:10 P M 0.20 mg/L 1 5.96 0 Silver 2/12/2013 5:44:37 PM 0.050 mg/L 1 < 0.050 0 Zinc 2/11/2013 10:17:10 P M 0.10 mg/L 1 4.79 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 2/15/2013 0.02 mg/L 1 2.71 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 2/6/2013 2:03:00 PM 25 mg/L 5 < 25 0

I.D. 56-00306 PA DEP 

# Page 4 of 6

### Project: Keystone 611 M(a) Client Sample ID: Plum Creek

Collection Date: 2/5/2013 11:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1302131
Lab ID: G1302131-003

DF 

# Geochemical Testing Date: 18-Feb-13

Received Date: 2/5/2013 6:34:16 PM 

# Laboratory Results

Sampled By : Client

MCL
INORGANIC NON METALS SM 4500-CO2D Analyst: MBG

Bicarbonate 2/6/2013 10:25:00 AM 5 mg/L CaCO3 1 30 0 

### INORGANIC NON-METALS SM 4500-CO2 Analyst: MBG

Carbonate 2/6/2013 10:25:00 AM 5 mg/L CaCO3 1 < 5 0 

### INORGANIC NON-METALS SM 2540 C Analyst: AM

Total dissolved solids 2/6/2013 3:24:38 PM 20 mg/L 1 112 0 

### PHYSICAL TESTS SM 2540D Analyst: AM

Total suspended solids 2/6/2013 3:34:02 PM 5 mg/L 1 < 5 0 

### INORGANIC NON-METALS ASTM D1067-06 Analyst: MBG

Alkalinity to pH 4.5 2/6/2013 10:25:00 AM 5 mg/L CaCO3 1 30 0 

### INORGANIC NON-METALS EPA 300.0 Analyst: MLR

Nitrate Nitrogen 2/5/2013 11:49:00 PM 0.05 mg/L as N 1 0.69 0 Nitrite Nitrogen 2/5/2013 11:49:00 PM 0.05 mg/L as N 1 < 0.05 0 Nitrate - Nitrite 2/5/2013 11:49:00 PM 0.05 mg/L as N 1 0.69 0 

### INORGANIC NON-METALS EPA 300.0 Analyst: MLR

Chloride 2/5/2013 11:49:00 PM 1 mg/L 1 7 0 Fluoride 2/5/2013 11:49:00 PM 0.1 mg/L 1 < 0.1 0 Sulfate 2/5/2013 11:49:00 PM 2 mg/L 1 31 0 

### INORGANIC NON-METALS EPA 350.1 Analyst: SLY

Ammonia Nitrogen - Distilled 2/6/2013 12:23:17 PM 0.10 mg/L as N 1 < 0.10 0 

### INORGANICS NON METALS SM 4500-SIO2 C Analyst: SAG

Silica, total 2/7/2013 1:24:00 PM 0.20 mg/L 1 4.9 0 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Barium 2/7/2013 12:40:00 AM 0.01 mg/L 1 0.03 0 Boron 2/7/2013 12:40:00 AM 0.05 mg/L 1 < 0.05 0 Calcium 2/7/2013 12:40:00 AM 0.1 mg/L 1 16.1 0 Iron 2/7/2013 12:40:00 AM 0.05 mg/L 1 0.33 0 Magnesium 2/7/2013 12:40:00 AM 0.1 mg/L 1 5.5 0 Manganese 2/7/2013 12:40:00 AM 0.01 mg/L 1 0.10 0 Potassium 2/7/2013 12:40:00 AM 0.5 mg/L 1 1.5 0 Sodium 2/7/2013 1:03:16 PM 0.2 mg/L 1 10.1 0 Strontium 2/7/2013 12:40:00 AM 0.01 mg/L 1 0.13 0 

### INDICATOR ORGANIC PARAMETERS SM 20 5310-C Analyst: ACG

Total Organic Carbon 2/6/2013 5:18:00 PM 0.5 mg/L 1 1.3 0

I.D. 56-00306 PA DEP 

# Page 5 of 6

### Project: Keystone 611 M(a) Client Sample ID: Crooked Creek

Collection Date: 2/5/2013 11:45:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1302131
Lab ID: G1302131-004

DF 

# Geochemical Testing Date: 18-Feb-13

Received Date: 2/5/2013 6:34:16 PM 

# Laboratory Results

Sampled By : Client

MCL
INORGANIC NON-METALS SM 2540 C Analyst: AM

Total dissolved solids 2/6/2013 3:24:38 PM 20 mg/L 1 170 0 

### PHYSICAL TESTS SM 2540D Analyst: AM

Total suspended solids 2/6/2013 3:34:02 PM 5 mg/L 1 31 

### INORGANIC NON-METALS ASTM D1067-06 Analyst: MBG

Alkalinity to pH 4.5 2/6/2013 10:32:00 AM 5 mg/L CaCO3 1 37 0 

### INORGANIC NON-METALS EPA 300.0 Analyst: MLR

Nitrate Nitrogen 2/6/2013 12:05:00 AM 0.05 mg/L as N 1 0.70 0 Nitrite Nitrogen 2/6/2013 12:05:00 AM 0.05 mg/L as N 1 < 0.05 0 Nitrate - Nitrite 2/6/2013 12:05:00 AM 0.05 mg/L as N 1 0.70 0 

### INORGANIC NON-METALS EPA 300.0 Analyst: MLR

Chloride 2/6/2013 12:05:00 AM 1 mg/L 1 18 0 Sulfate 2/6/2013 12:05:00 AM 2 mg/L 1 51 0 

### INORGANICS NON METALS SM 4500-SIO2 C Analyst: SAG

Silica, total 2/7/2013 1:24:00 PM 0.20 mg/L 1 6.3 0 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Calcium 2/7/2013 12:49:00 AM 0.1 mg/L 1 22.7 0 Iron 2/7/2013 12:49:00 AM 0.05 mg/L 1 1.28 0 Magnesium 2/7/2013 12:49:00 AM 0.1 mg/L 1 7.2 0 Manganese 2/7/2013 12:49:00 AM 0.01 mg/L 1 0.21 0 Potassium 2/7/2013 12:49:00 AM 0.5 mg/L 1 1.8 0 Sodium 2/7/2013 1:05:50 PM 0.2 mg/L 1 21.4 0 

### INDICATOR ORGANIC PARAMETERS SM 20 5310-C Analyst: ACG

Total Organic Carbon 2/6/2013 8:59:00 PM 0.5 mg/L 1 1.3 0

I.D. 56-00306 PA DEP 

# Page 6 of 6

# Wednesday, February20, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 M(b) Order No.: G1302413 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 2/11/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 20-Feb-13 Date: 

# Geochemical Testing
Project: Keystone 611 M(b) CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1302413 

# CASE NARRATIVE

Samples were not filtered in the field for dissolved metals; samples were lab filtered. No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 M(b) Client Sample ID: FGD Influent

Collection Date: 2/11/2013 8:10:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1302413
Lab ID: G1302413-001

DF 

# Geochemical Testing Date: 20-Feb-13

Received Date: 2/11/2013 3:37:16 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: AM

Total dissolved solids 2/12/2013 3:31:44 PM 100 mg/L 5 30200 0 

### PHYSICAL TESTS SM 2540D Analyst: AM

Total suspended solids 2/12/2013 3:47:28 PM 100 mg/L 20 1950 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 2/13/2013 7:35:00 AM 3 mg/L 3 12 0 Finish Date/Time 2/13/2013 7:35:00 AM 0 mg/L 3 2/18/2013 07:30 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: CLS

Chloride 2/11/2013 4:52:00 PM 1000 mg/L 200 15800 

### INORGANIC METALS EPA 200.7 Analyst: MAS

Iron, dissolved 2/13/2013 5:15:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 2/13/2013 5:15:00 PM 0.02 mg/L 1 0.38 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 2/14/2013 10:11:56 A M 0.100 mg/L 500 0.178 0 

### INORGANIC METALS EPA 200.7 Analyst: MS

Aluminum 2/14/2013 9:07:29 PM 1.0 mg/L 1 117 0 Arsenic 2/14/2013 9:07:29 PM 0.20 mg/L 1 0.51 0 Beryllium 2/14/2013 9:07:29 PM 0.010 mg/L 1 < 0.010 0 Boron 2/15/2013 1:28:52 PM 5.00 mg/L 10 320 0 Cadmium 2/14/2013 9:07:29 PM 0.020 mg/L 1 0.030 0 Chromium 2/15/2013 1:31:26 PM 0.10 mg/L 1 0.58 0 Copper 2/14/2013 9:07:29 PM 0.10 mg/L 1 0.67 0 Iron 2/15/2013 1:31:26 PM 0.50 mg/L 1 571 0 Lead 2/14/2013 9:07:29 PM 0.20 mg/L 1 < 0.20 0 Manganese 2/14/2013 9:07:29 PM 0.10 mg/L 1 387 0 Nickel 2/14/2013 9:07:29 PM 0.10 mg/L 1 2.32 0 Selenium 2/14/2013 9:07:29 PM 0.20 mg/L 1 1.79 0 Silver 2/14/2013 9:07:29 PM 0.050 mg/L 1 < 0.050 0 Zinc 2/14/2013 9:07:29 PM 0.10 mg/L 1 1.11 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 2/19/2013 0.02 mg/L 1 0.58 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: AJR

Oil & Grease 2/14/2013 2:47:00 PM 18 mg/L 3.57 < 18 0

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 M(b) Client Sample ID: Outfall 101

Collection Date: 2/11/2013 8:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1302413
Lab ID: G1302413-002

DF 

# Geochemical Testing Date: 20-Feb-13

Received Date: 2/11/2013 3:37:16 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: AM

Total suspended solids 2/12/2013 3:47:29 PM 1 mg/L 1 < 1 10 

### INORGANIC NON-METALS SM 2540 C Analyst: AM

Total dissolved solids 2/12/2013 3:31:44 PM 20 mg/L 1 28100 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 2/13/2013 7:35:00 AM 2 mg/L 1.5 < 2 25 Finish Date/Time 2/13/2013 7:35:00 AM 0 mg/L 1.5 2/18/2013 07:30 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: CLS

Chloride 2/11/2013 4:52:00 PM 1000 mg/L 200 14000 

### INORGANIC METALS EPA 200.7 Analyst: MAS

Iron, dissolved 2/13/2013 5:32:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 2/13/2013 5:32:00 PM 0.02 mg/L 1 0.09 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 2/14/2013 10:13:35 A M 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: MAS

Aluminum 2/13/2013 5:01:00 PM 0.1 mg/L 1 < 0.1 0 Arsenic 2/13/2013 5:01:00 PM 0.02 mg/L 1 < 0.02 0 Beryllium 2/13/2013 5:01:00 PM 0.001 mg/L 1 < 0.001 0.8 Boron 2/14/2013 9:56:00 AM 2.50 mg/L 50 283 0 Cadmium 2/13/2013 5:01:00 PM 0.002 mg/L 1 < 0.002 0 Chromium 2/13/2013 5:01:00 PM 0.01 mg/L 1 < 0.01 0 Copper 2/13/2013 5:01:00 PM 0.01 mg/L 1 < 0.01 0.1 Iron 2/13/2013 5:01:00 PM 0.05 mg/L 1 < 0.05 0 Lead 2/13/2013 5:01:00 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 2/13/2013 5:01:00 PM 0.01 mg/L 1 31.1 0 Nickel 2/13/2013 5:01:00 PM 0.01 mg/L 1 < 0.01 0 Selenium 2/13/2013 5:01:00 PM 0.02 mg/L 1 0.08 3.4 Silver 2/13/2013 5:01:00 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 2/13/2013 5:01:00 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 2/19/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: AJR

Oil & Grease 2/14/2013 2:48:00 PM 5 mg/L 0.99 < 5 15

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Tuesday, February26, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1302709 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 2/18/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 26-Feb-13 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1302709 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 2/18/2013 9:40:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1302709
Lab ID: G1302709-001

DF 

# Geochemical Testing Date: 26-Feb-13

Received Date: 2/18/2013 4:43:30 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: AM

Total suspended solids 2/19/2013 3:05:42 PM 1 mg/L 1 1 10 

### INORGANIC NON-METALS SM 2540 C Analyst: AM

Total dissolved solids 2/19/2013 3:15:47 PM 20 mg/L 1 25400 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 2/20/2013 7:35:00 AM 2 mg/L 1.5 < 2 25 Finish Date/Time 2/20/2013 7:35:00 AM 0 mg/L 1.5 2/25/2013 08:18 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: CLS

Chloride 2/19/2013 2:19:00 PM 2500 mg/L 500 14500 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Iron, dissolved 2/20/2013 3:26:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 2/20/2013 3:26:00 PM 0.02 mg/L 1 0.08 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 2/21/2013 9:48:02 AM 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Aluminum 2/20/2013 3:51:00 PM 0.1 mg/L 1 < 0.1 0 Arsenic 2/20/2013 3:51:00 PM 0.02 mg/L 1 < 0.02 0 Beryllium 2/20/2013 3:51:00 PM 0.001 mg/L 1 < 0.001 0.8 Boron 2/21/2013 4:05:49 PM 2.50 mg/L 50 315 0 Cadmium 2/20/2013 3:51:00 PM 0.002 mg/L 1 < 0.002 0 Chromium 2/20/2013 3:51:00 PM 0.01 mg/L 1 < 0.01 0 Copper 2/20/2013 3:51:00 PM 0.01 mg/L 1 < 0.01 0.1 Iron 2/20/2013 3:51:00 PM 0.05 mg/L 1 < 0.05 0 Lead 2/20/2013 3:51:00 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 2/20/2013 3:51:00 PM 0.01 mg/L 1 39.2 0 Nickel 2/20/2013 3:51:00 PM 0.01 mg/L 1 < 0.01 0 Selenium 2/20/2013 3:51:00 PM 0.02 mg/L 1 0.09 3.4 Silver 2/20/2013 3:51:00 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 2/20/2013 3:51:00 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 2/21/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: AJR

Oil & Grease 2/20/2013 3:25:00 PM 5 mg/L 1 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 2/18/2013 9:20:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1302709
Lab ID: G1302709-002

DF 

# Geochemical Testing Date: 26-Feb-13

Received Date: 2/18/2013 4:43:30 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: AM

Total dissolved solids 2/19/2013 3:15:47 PM 100 mg/L 5 29900 0 

### PHYSICAL TESTS SM 2540D Analyst: AM

Total suspended solids 2/19/2013 3:05:43 PM 100 mg/L 20 11100 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 2/20/2013 7:35:00 AM 6 mg/L 6 24 0 Finish Date/Time 2/20/2013 7:35:00 AM 0 mg/L 6 2/25/2013 08:18 

### INORGANIC METALS USGS I-1230-85 Analyst: MLR

Hexavalent Chromium 2/18/2013 5:19:00 PM 0.020 mg/L 1 < 0.020 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: CLS

Chloride 2/19/2013 2:19:00 PM 2500 mg/L 500 17900 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Iron, dissolved 2/20/2013 6:10:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 2/20/2013 6:10:00 PM 0.02 mg/L 1 1.09 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 2/21/2013 9:49:40 AM 0.100 mg/L 500 0.191 0 

### INORGANIC METALS EPA 200.7 Analyst: MAS

Aluminum 2/19/2013 10:09:31 P M 1.0 mg/L 1 173 0 Arsenic 2/19/2013 10:09:31 P M 0.20 mg/L 1 0.88 0 Beryllium 2/19/2013 10:09:31 P M 0.010 mg/L 1 0.025 0 Boron 2/20/2013 2:00:00 PM 5.00 mg/L 10 364 0 Cadmium 2/19/2013 10:09:31 P M 0.020 mg/L 1 < 0.020 0 Chromium 2/19/2013 10:09:31 P M 0.10 mg/L 1 0.88 0 Copper 2/19/2013 10:09:31 P M 0.10 mg/L 1 0.94 0 Iron 2/19/2013 10:09:31 P M 0.50 mg/L 1 971 0 Lead 2/19/2013 10:09:31 P M 0.20 mg/L 1 0.28 0 Manganese 2/19/2013 10:09:31 P M 0.10 mg/L 1 423 0 Nickel 2/19/2013 10:09:31 P M 0.10 mg/L 1 2.51 0 Selenium 2/19/2013 10:09:31 P M 0.20 mg/L 1 2.04 0 Silver 2/19/2013 10:09:31 P M 0.050 mg/L 1 < 0.050 0 Zinc 2/19/2013 10:09:31 P M 0.10 mg/L 1 1.96 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 2/21/2013 0.02 mg/L 1 0.88 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: AJR

Oil & Grease 2/22/2013 3:14:00 PM 19 mg/L 3.85 < 19 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Tuesday, March 05, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1302A18 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 2/25/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 05-Mar-13 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1302A18 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 2/25/2013 9:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1302A18
Lab ID: G1302A18-001

DF 

# Geochemical Testing Date: 05-Mar-13

Received Date: 2/25/2013 5:41:34 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: AM

Total suspended solids 2/26/2013 3:33:01 PM 1 mg/L 1 < 1 10 

### INORGANIC NON-METALS SM 2540 C Analyst: AM

Total dissolved solids 2/26/2013 3:32:18 PM 20 mg/L 1 22800 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 2/27/2013 7:20:00 AM 2 mg/L 1.5 < 2 25 Finish Date/Time 2/27/2013 7:20:00 AM 0 mg/L 1.5 3/4/2013 08:05 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 2/26/2013 2:26:00 PM 1000 mg/L 200 14000 

### INORGANIC METALS EPA 200.7 Analyst: MAS

Iron, dissolved 2/27/2013 12:43:13 A M 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 2/27/2013 12:43:13 A M 0.02 mg/L 1 0.05 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 2/28/2013 10:16:41 A M 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: MAS

Aluminum 2/27/2013 12:45:47 A M 0.1 mg/L 1 < 0.1 0 Arsenic 2/27/2013 12:45:47 A M 0.02 mg/L 1 < 0.02 0 Beryllium 2/27/2013 12:45:47 A M 0.001 mg/L 1 < 0.001 0.8 Boron 2/28/2013 9:22:15 AM 2.50 mg/L 50 287 0 Cadmium 2/27/2013 12:45:47 A M 0.002 mg/L 1 < 0.002 0 Chromium 2/27/2013 12:45:47 A M 0.01 mg/L 1 < 0.01 0 Copper 2/27/2013 12:45:47 A M 0.01 mg/L 1 < 0.01 0.1 Iron 2/27/2013 12:45:47 A M 0.05 mg/L 1 < 0.05 0 Lead 2/27/2013 12:45:47 A M 0.02 mg/L 1 < 0.02 0.1 Manganese 2/27/2013 12:31:00 P M 0.10 mg/L 10 77.7 0 Nickel 2/27/2013 12:45:47 A M 0.01 mg/L 1 < 0.01 0 Selenium 2/27/2013 12:45:47 A M 0.02 mg/L 1 0.05 3.4 Silver 2/27/2013 12:45:47 A M 0.005 mg/L 1 < 0.005 0.1 Zinc 2/27/2013 12:45:47 A M 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 3/1/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease S 2/27/2013 6:05:00 PM 5 mg/L 1.05 < 5 15 NOTES: S - Spike recovery indicates a possible matrix effect. The method is in control as indicated by the LCS.

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 2/25/2013 9:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1302A18
Lab ID: G1302A18-002

DF 

# Geochemical Testing Date: 05-Mar-13

Received Date: 2/25/2013 5:41:34 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: AM

Total dissolved solids 2/26/2013 3:32:19 PM 200 mg/L 10 27400 0 

### PHYSICAL TESTS SM 2540D Analyst: AM

Total suspended solids 2/26/2013 3:33:00 PM 200 mg/L 40 34800 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 2/27/2013 7:20:00 AM 12 mg/L 12 37 0 Finish Date/Time 2/27/2013 7:20:00 AM 0 mg/L 12 3/4/2013 08:05 

### INORGANIC METALS USGS I-1230-85 Analyst: SEF

Hexavalent Chromium 2/25/2013 6:30:00 PM 0.020 mg/L 1 < 0.020 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 2/26/2013 2:26:00 PM 1000 mg/L 200 17000 

### INORGANIC METALS EPA 200.7 Analyst: MAS

Iron, dissolved 2/27/2013 12:48:21 A M 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 2/27/2013 12:48:21 A M 0.02 mg/L 1 0.94 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 2/28/2013 10:18:18 A M 0.100 mg/L 500 0.545 0 

### INORGANIC METALS EPA 200.7 Analyst: MAS

Aluminum 3/2/2013 3:24:00 AM 1.0 mg/L 1 537 0 Arsenic 3/2/2013 3:24:00 AM 0.20 mg/L 1 2.85 0 Beryllium 3/2/2013 3:24:00 AM 0.010 mg/L 1 0.067 0 Boron 3/4/2013 3:27:10 PM 5.00 mg/L 10 392 0 Cadmium 3/2/2013 3:24:00 AM 0.020 mg/L 1 0.038 0 Chromium 3/2/2013 3:24:00 AM 0.10 mg/L 1 3.22 0 Copper 3/2/2013 3:24:00 AM 0.10 mg/L 1 2.24 0 Iron 3/4/2013 3:27:10 PM 5.00 mg/L 10 3370 0 Lead 3/2/2013 3:24:00 AM 0.20 mg/L 1 1.34 0 Manganese 3/4/2013 3:27:10 PM 1.00 mg/L 10 517 0 Nickel 3/2/2013 3:24:00 AM 0.10 mg/L 1 6.12 0 Selenium 3/2/2013 3:24:00 AM 0.20 mg/L 1 5.22 0 Silver 3/2/2013 3:24:00 AM 0.050 mg/L 1 < 0.050 0 Zinc 3/2/2013 3:24:00 AM 0.10 mg/L 1 6.80 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 3/5/2013 0.02 mg/L 1 3.22 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 2/27/2013 6:06:00 PM 19 mg/L 3.85 < 19 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Wednesday, March 13, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 M(a) Order No.: G1303073 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 4 sample(s) on 3/4/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 6

### 13-Mar-13 Date: 

# Geochemical Testing
Project: Keystone 611 M(a) CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1303073 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 6

### Project: Keystone 611 M(a) Client Sample ID: Outfall 101

Collection Date: 3/4/2013 8:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1303073
Lab ID: G1303073-001

DF 

# Geochemical Testing Date: 13-Mar-13

Received Date: 3/4/2013 4:19:38 PM 

# Laboratory Results

Sampled By : Water Lab

MCL
PHYSICAL TESTS SM 2540D Analyst: AM

Total suspended solids 3/5/2013 2:49:50 PM 1 mg/L 1 4 10 

### INORGANIC NON-METALS SM 2540 C Analyst: AM

Total dissolved solids 3/5/2013 2:39:31 PM 20 mg/L 1 27500 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 3/6/2013 5:55:00 AM 2 mg/L 1.5 < 2 25 Finish Date/Time 3/6/2013 5:55:00 AM 0 mg/L 1.5 3/11/2013 06:12 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 3/13/2013 8:40:00 AM 1000 mg/L 200 15500 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Iron, dissolved 3/6/2013 8:02:19 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 3/6/2013 8:02:19 PM 0.02 mg/L 1 0.04 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 3/7/2013 9:54:41 AM 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Aluminum 3/6/2013 8:12:51 PM 0.1 mg/L 1 < 0.1 0 Arsenic 3/6/2013 8:12:51 PM 0.02 mg/L 1 < 0.02 0 Beryllium 3/6/2013 8:12:51 PM 0.001 mg/L 1 < 0.001 0.8 Boron 3/7/2013 3:41:00 PM 2.50 mg/L 50 297 0 Cadmium 3/6/2013 8:12:51 PM 0.002 mg/L 1 < 0.002 0 Chromium 3/6/2013 8:12:51 PM 0.01 mg/L 1 < 0.01 0 Copper 3/6/2013 8:12:51 PM 0.01 mg/L 1 < 0.01 0.1 Iron 3/6/2013 8:12:51 PM 0.05 mg/L 1 < 0.05 0 Lead 3/6/2013 8:12:51 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 3/7/2013 4:04:00 PM 0.10 mg/L 10 79.1 0 Nickel 3/6/2013 8:12:51 PM 0.01 mg/L 1 < 0.01 0 Selenium 3/6/2013 8:12:51 PM 0.02 mg/L 1 0.05 3.4 Silver 3/6/2013 8:12:51 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 3/6/2013 8:12:51 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 3/11/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 3/6/2013 4:30:00 PM 5 mg/L 1 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 6

### Project: Keystone 611 M(a) Client Sample ID: FGD Influent

Collection Date: 3/4/2013 8:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1303073
Lab ID: G1303073-002

DF 

# Geochemical Testing Date: 13-Mar-13

Received Date: 3/4/2013 4:19:38 PM 

# Laboratory Results

Sampled By : Water Lab IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: AM

Total dissolved solids 3/5/2013 2:39:34 PM 200 mg/L 10 33600 0 

### PHYSICAL TESTS SM 2540D Analyst: AM

Total suspended solids 3/5/2013 2:49:52 PM 200 mg/L 40 20100 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 3/6/2013 5:55:00 AM 3 mg/L 3 11 0 Finish Date/Time 3/6/2013 5:55:00 AM 0 mg/L 3 3/11/2013 06:12 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 3/6/2013 10:26:00 AM 1000 mg/L 200 14000 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Iron, dissolved 3/6/2013 8:15:26 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 3/6/2013 8:15:26 PM 0.02 mg/L 1 0.26 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 3/7/2013 9:56:17 AM 0.100 mg/L 500 0.375 0 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Aluminum 3/8/2013 5:40:00 PM 1.0 mg/L 1 308 0 Arsenic 3/8/2013 5:40:00 PM 0.20 mg/L 1 1.63 0 Beryllium 3/8/2013 5:40:00 PM 0.010 mg/L 1 0.039 0 Boron 3/11/2013 2:03:19 PM 5.00 mg/L 10 417 0 Cadmium 3/8/2013 5:40:00 PM 0.020 mg/L 1 0.071 0 Chromium 3/8/2013 5:40:00 PM 0.10 mg/L 1 1.71 0 Copper 3/8/2013 5:40:00 PM 0.10 mg/L 1 1.34 0 Iron 3/8/2013 5:40:00 PM 0.50 mg/L 1 1640 0 Lead 3/8/2013 5:40:00 PM 0.20 mg/L 1 0.83 0 Manganese 3/8/2013 5:40:00 PM 0.10 mg/L 1 462 0 Nickel 3/8/2013 5:40:00 PM 0.10 mg/L 1 4.32 0 Selenium 3/8/2013 5:40:00 PM 0.20 mg/L 1 4.47 0 Silver 3/8/2013 5:40:00 PM 0.050 mg/L 1 < 0.050 0 Zinc 3/8/2013 5:40:00 PM 0.10 mg/L 1 10.9 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 3/11/2013 0.02 mg/L 1 0.17 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 3/6/2013 6:04:00 PM 18 mg/L 3.57 < 18 0

I.D. 56-00306 PA DEP 

# Page 4 of 6

### Project: Keystone 611 M(a) Client Sample ID: Plum Creek

Collection Date: 3/4/2013 8:30:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1303073
Lab ID: G1303073-003

DF 

# Geochemical Testing Date: 13-Mar-13

Received Date: 3/4/2013 4:19:38 PM 

# Laboratory Results

Sampled By : Water Lab

MCL
INORGANIC NON METALS SM 4500-CO2D Analyst: MBG

Bicarbonate 3/5/2013 5:55:00 PM 5 mg/L CaCO3 1 29 0 

### INORGANIC NON-METALS SM 4500-CO2 Analyst: MBG

Carbonate 3/5/2013 5:55:00 PM 5 mg/L CaCO3 1 < 5 0 

### INORGANIC NON-METALS SM 2540 C Analyst: AM

Total dissolved solids 3/5/2013 2:39:34 PM 20 mg/L 1 122 0 

### PHYSICAL TESTS SM 2540D Analyst: AM

Total suspended solids 3/5/2013 2:49:53 PM 5 mg/L 1 < 5 0 

### INORGANIC NON-METALS ASTM D1067-06 Analyst: MBG

Alkalinity to pH 4.5 3/5/2013 5:55:00 PM 5 mg/L CaCO3 1 29 0 

### INORGANIC NON-METALS EPA 300.0 Analyst: MLR

Nitrate Nitrogen 3/4/2013 7:24:00 PM 0.05 mg/L as N 1 0.61 0 Nitrite Nitrogen 3/4/2013 7:24:00 PM 0.05 mg/L as N 1 < 0.05 0 Nitrate - Nitrite 3/4/2013 7:24:00 PM 0.05 mg/L as N 1 0.61 0 

### INORGANIC NON-METALS EPA 300.0 Analyst: MLR

Chloride 3/4/2013 7:24:00 PM 1 mg/L 1 8 0 Fluoride 3/4/2013 7:24:00 PM 0.1 mg/L 1 < 0.1 0 Sulfate 3/4/2013 7:24:00 PM 2 mg/L 1 31 0 

### INORGANIC NON-METALS EPA 350.1 Analyst: SLY

Ammonia Nitrogen - Distilled 3/5/2013 11:51:53 AM 0.10 mg/L as N 1 < 0.10 0 

### INORGANICS NON METALS SM 4500-SIO2 C Analyst: MLR

Silica, total 3/6/2013 11:30:00 AM 0.20 mg/L 1 4.9 0 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Barium 3/6/2013 8:18:03 PM 0.01 mg/L 1 0.03 0 Boron 3/6/2013 8:18:03 PM 0.05 mg/L 1 0.11 0 Calcium 3/6/2013 8:18:03 PM 0.1 mg/L 1 15.1 0 Iron 3/6/2013 8:18:03 PM 0.05 mg/L 1 0.21 0 Magnesium 3/6/2013 8:18:03 PM 0.1 mg/L 1 4.6 0 Manganese 3/6/2013 8:18:03 PM 0.01 mg/L 1 0.10 0 Potassium 3/6/2013 8:18:03 PM 0.5 mg/L 1 1.2 0 Sodium 3/7/2013 4:08:00 PM 0.2 mg/L 1 11.5 0 Strontium 3/6/2013 8:18:03 PM 0.01 mg/L 1 0.12 0 

### INDICATOR ORGANIC PARAMETERS SM 20 5310-C Analyst: MTM

Total Organic Carbon 3/5/2013 4:26:00 PM 0.5 mg/L 1 1.3 0

I.D. 56-00306 PA DEP 

# Page 5 of 6

### Project: Keystone 611 M(a) Client Sample ID: Crooked Creek

Collection Date: 3/4/2013 7:30:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1303073
Lab ID: G1303073-004

DF 

# Geochemical Testing Date: 13-Mar-13

Received Date: 3/4/2013 4:19:38 PM 

# Laboratory Results

Sampled By : Water Lab

MCL
INORGANIC NON-METALS SM 2540 C Analyst: AM

Total dissolved solids 3/5/2013 2:39:34 PM 20 mg/L 1 154 0 

### PHYSICAL TESTS SM 2540D Analyst: AM

Total suspended solids 3/5/2013 2:49:53 PM 5 mg/L 1 8 

### INORGANIC NON-METALS ASTM D1067-06 Analyst: MBG

Alkalinity to pH 4.5 3/5/2013 5:58:00 PM 5 mg/L CaCO3 1 30 0 

### INORGANIC NON-METALS EPA 300.0 Analyst: MLR

Nitrate Nitrogen 3/4/2013 7:41:00 PM 0.05 mg/L as N 1 0.70 0 Nitrite Nitrogen 3/4/2013 7:41:00 PM 0.05 mg/L as N 1 < 0.05 0 Nitrate - Nitrite 3/4/2013 7:41:00 PM 0.05 mg/L as N 1 0.70 0 

### INORGANIC NON-METALS EPA 300.0 Analyst: MLR

Chloride 3/4/2013 7:41:00 PM 1 mg/L 1 16 0 Sulfate 3/4/2013 7:41:00 PM 2 mg/L 1 40 0 

### INORGANICS NON METALS SM 4500-SIO2 C Analyst: MLR

Silica, total 3/6/2013 11:30:00 AM 0.20 mg/L 1 5.6 0 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Calcium 3/6/2013 7:54:29 PM 0.1 mg/L 1 20.2 0 Iron 3/6/2013 7:54:29 PM 0.05 mg/L 1 0.49 0 Magnesium 3/6/2013 7:54:29 PM 0.1 mg/L 1 5.7 0 Manganese 3/6/2013 7:54:29 PM 0.01 mg/L 1 0.12 0 Potassium 3/7/2013 3:24:00 PM 0.5 mg/L 1 1.5 0 Sodium 3/7/2013 3:24:00 PM 0.2 mg/L 1 17.0 0 

### INDICATOR ORGANIC PARAMETERS SM 20 5310-C Analyst: MTM

Total Organic Carbon 3/5/2013 5:03:00 PM 0.5 mg/L 1 1.2 0

I.D. 56-00306 PA DEP 

# Page 6 of 6

# Friday, March 22, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 M(b) Order No.: G1303397 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 3/11/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 22-Mar-13 Date: 

# Geochemical Testing
Project: Keystone 611 M(b) CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1303397 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 M(b) Client Sample ID: Outfall 101

Collection Date: 3/11/2013 8:25:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1303397
Lab ID: G1303397-001

DF 

# Geochemical Testing Date: 22-Mar-13

Received Date: 3/11/2013 5:59:31 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 3/12/2013 12:46:47 P M 1 mg/L 1 6 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 3/12/2013 2:37:33 PM 100 mg/L 5 30700 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 3/13/2013 7:20:00 AM 2 mg/L 1.5 < 2 25 Finish Date/Time 3/13/2013 7:20:00 AM 0 mg/L 1.5 3/18/2013 07:50 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 3/12/2013 9:13:00 AM 1000 mg/L 200 14600 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Iron, dissolved 3/19/2013 3:53:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 3/13/2013 6:27:40 PM 0.02 mg/L 1 0.09 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 3/14/2013 10:40:58 A M 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: MAS

Aluminum 3/13/2013 6:25:05 PM 0.1 mg/L 1 < 0.1 0 Arsenic 3/13/2013 6:25:05 PM 0.02 mg/L 1 < 0.02 0 Beryllium 3/13/2013 6:25:05 PM 0.001 mg/L 1 < 0.001 0.8 Boron 3/14/2013 1:16:35 PM 2.50 mg/L 50 363 0 Cadmium 3/13/2013 6:25:05 PM 0.002 mg/L 1 < 0.002 0 Chromium 3/13/2013 6:25:05 PM 0.01 mg/L 1 < 0.01 0 Copper 3/13/2013 6:25:05 PM 0.01 mg/L 1 < 0.01 0.1 Iron 3/14/2013 1:19:09 PM 0.05 mg/L 1 < 0.05 0 Lead 3/14/2013 1:19:09 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 3/13/2013 6:25:05 PM 0.01 mg/L 1 44.0 0 Nickel 3/13/2013 6:25:05 PM 0.01 mg/L 1 < 0.01 0 Selenium 3/13/2013 6:25:05 PM 0.02 mg/L 1 0.09 3.4 Silver 3/13/2013 6:25:05 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 3/13/2013 6:25:05 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 3/15/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease S 3/13/2013 2:22:00 PM 5 mg/L 1 < 5 15 NOTES: S - Spike recovery indicates a possible matrix effect. The method is in control as indicated by the LCS.

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 M(b) Client Sample ID: FGD Influent

Collection Date: 3/11/2013 8:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1303397
Lab ID: G1303397-002

DF 

# Geochemical Testing Date: 22-Mar-13

Received Date: 3/11/2013 5:59:31 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 3/12/2013 2:37:33 PM 200 mg/L 10 32000 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 3/12/2013 12:46:45 P M 200 mg/L 40 23200 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 3/13/2013 7:20:00 AM 3 mg/L 3 12 0 Finish Date/Time 3/13/2013 7:20:00 AM 0 mg/L 3 3/18/2013 07:50 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 3/12/2013 9:13:00 AM 1000 mg/L 200 16900 

### INORGANIC METALS EPA 200.7 Analyst: MAS

Iron, dissolved 3/14/2013 8:44:28 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 3/14/2013 8:44:28 PM 0.02 mg/L 1 0.20 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 3/14/2013 10:42:35 A M 0.100 mg/L 500 0.625 0 

### INORGANIC METALS EPA 200.7 Analyst: MAS

Aluminum 3/13/2013 9:08:29 PM 1.0 mg/L 1 411 0 Arsenic 3/13/2013 9:08:29 PM 0.20 mg/L 1 1.74 0 Beryllium 3/13/2013 9:08:29 PM 0.010 mg/L 1 0.032 0 Boron 3/13/2013 9:05:52 PM 5.00 mg/L 10 408 0 Cadmium 3/13/2013 9:08:29 PM 0.020 mg/L 1 0.062 0 Chromium 3/13/2013 9:08:29 PM 0.10 mg/L 1 1.89 0 Copper 3/13/2013 9:08:29 PM 0.10 mg/L 1 1.51 0 Iron 3/19/2013 5:46:00 PM 0.50 mg/L 1 1660 0 Lead 3/13/2013 9:08:29 PM 0.20 mg/L 1 0.70 0 Manganese 3/13/2013 9:08:29 PM 0.10 mg/L 1 406 0 Nickel 3/13/2013 9:08:29 PM 0.10 mg/L 1 3.76 0 Selenium 3/13/2013 9:08:29 PM 0.20 mg/L 1 5.47 0 Silver 3/13/2013 9:08:29 PM 0.050 mg/L 1 < 0.050 0 Zinc 3/13/2013 9:08:29 PM 0.10 mg/L 1 4.25 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 3/15/2013 0.02 mg/L 1 1.87 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 3/13/2013 3:49:00 PM 19 mg/L 3.7 < 19 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Wednesday, March 27, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1303783 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 3/19/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 27-Mar-13 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1303783 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 3/19/2013 9:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1303783
Lab ID: G1303783-001

DF 

# Geochemical Testing Date: 27-Mar-13

Received Date: 3/19/2013 5:42:01 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 3/20/2013 1:35:27 PM 1 mg/L 1 2 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 3/20/2013 1:36:02 PM 20 mg/L 1 26200 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 3/20/2013 9:40:00 AM 2 mg/L 1.5 < 2 25 Finish Date/Time 3/20/2013 9:40:00 AM 0 mg/L 1.5 3/25/2013 10:57 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 3/20/2013 11:12:00 A M 1000 mg/L 200 13700 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Iron, dissolved 3/20/2013 8:51:53 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 3/20/2013 8:51:53 PM 0.02 mg/L 1 0.06 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 3/25/2013 10:32:50 A M 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Aluminum 3/20/2013 8:49:18 PM 0.1 mg/L 1 < 0.1 0 Arsenic 3/20/2013 8:49:18 PM 0.02 mg/L 1 < 0.02 0 Beryllium 3/20/2013 8:49:18 PM 0.001 mg/L 1 < 0.001 0.8 Boron 3/21/2013 2:22:36 PM 2.50 mg/L 50 315 0 Cadmium 3/20/2013 8:49:18 PM 0.002 mg/L 1 0.002 0 Chromium 3/20/2013 8:49:18 PM 0.01 mg/L 1 < 0.01 0 Copper 3/20/2013 8:49:18 PM 0.01 mg/L 1 < 0.01 0.1 Iron 3/20/2013 8:49:18 PM 0.05 mg/L 1 < 0.05 0 Lead 3/20/2013 8:49:18 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 3/20/2013 8:49:18 PM 0.01 mg/L 1 32.0 0 Nickel 3/20/2013 8:49:18 PM 0.01 mg/L 1 < 0.01 0 Selenium 3/20/2013 8:49:18 PM 0.02 mg/L 1 0.07 3.4 Silver 3/20/2013 8:49:18 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 3/20/2013 8:49:18 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 3/26/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 3/20/2013 4:48:00 PM 5 mg/L 1.04 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 3/19/2013 9:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1303783
Lab ID: G1303783-002

DF 

# Geochemical Testing Date: 27-Mar-13

Received Date: 3/19/2013 5:42:01 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 3/20/2013 1:36:01 PM 200 mg/L 10 32800 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 3/20/2013 1:35:17 PM 200 mg/L 40 21900 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 3/20/2013 9:40:00 AM 3 mg/L 3 13 0 Finish Date/Time 3/20/2013 9:40:00 AM 0 mg/L 3 3/25/2013 10:57 

### INORGANIC METALS USGS I-1230-85 Analyst: MLR

Hexavalent Chromium 3/19/2013 6:27:00 PM 0.020 mg/L 1 < 0.020 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 3/20/2013 11:12:00 A M 1000 mg/L 200 17000 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Iron, dissolved 3/20/2013 8:54:27 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 3/20/2013 8:54:27 PM 0.02 mg/L 1 0.22 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 3/25/2013 10:34:28 A M 0.100 mg/L 500 0.630 0 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Aluminum 3/21/2013 4:54:56 PM 1.0 mg/L 1 366 0 Arsenic 3/21/2013 4:54:56 PM 0.20 mg/L 1 2.01 0 Beryllium 3/21/2013 4:54:56 PM 0.010 mg/L 1 0.045 0 Boron 3/21/2013 4:54:56 PM 0.50 mg/L 1 418 0 Cadmium 3/21/2013 4:54:56 PM 0.020 mg/L 1 0.051 0 Chromium 3/21/2013 4:54:56 PM 0.10 mg/L 1 2.03 0 Copper 3/21/2013 4:54:56 PM 0.10 mg/L 1 1.49 0 Iron 3/21/2013 4:54:56 PM 0.50 mg/L 1 1520 0 Lead 3/21/2013 4:54:56 PM 0.20 mg/L 1 0.73 0 Manganese 3/21/2013 4:54:56 PM 0.10 mg/L 1 330 0 Nickel 3/21/2013 4:54:56 PM 0.10 mg/L 1 3.31 0 Selenium 3/21/2013 4:54:56 PM 0.20 mg/L 1 5.00 0 Silver 3/21/2013 4:54:56 PM 0.050 mg/L 1 < 0.050 0 Zinc 3/21/2013 4:54:56 PM 0.10 mg/L 1 3.94 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 3/26/2013 0.02 mg/L 1 2.03 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 3/20/2013 6:21:00 PM 19 mg/L 3.7 < 19 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Tuesday, April 02, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1303A22 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 3/25/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 02-Apr-13 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1303A22 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 3/25/2013 9:30:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1303A22
Lab ID: G1303A22-001

DF 

# Geochemical Testing Date: 02-Apr-13

Received Date: 3/25/2013 4:12:53 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 3/26/2013 2:00:28 PM 1 mg/L 1 5 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 3/26/2013 2:00:36 PM 100 mg/L 5 32900 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 3/27/2013 8:20:00 AM 2 mg/L 1.5 < 2 25 Finish Date/Time 3/27/2013 8:20:00 AM 0 mg/L 1.5 4/1/2013 08:45 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: CLS

Chloride 3/26/2013 10:58:00 A M 1000 mg/L 200 16100 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Iron, dissolved 3/28/2013 12:05:19 A M 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 3/28/2013 12:05:19 A M 0.02 mg/L 1 0.06 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 3/27/2013 11:04:02 A M 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Aluminum 3/28/2013 12:02:44 A M 0.1 mg/L 1 < 0.1 0 Arsenic 3/28/2013 12:02:44 A M 0.02 mg/L 1 < 0.02 0 Beryllium 3/28/2013 12:02:44 A M 0.001 mg/L 1 < 0.001 0.8 Boron 3/28/2013 4:59:00 PM 2.50 mg/L 50 342 0 Cadmium 3/28/2013 12:02:44 A M 0.002 mg/L 1 < 0.002 0 Chromium 3/28/2013 12:02:44 A M 0.01 mg/L 1 < 0.01 0 Copper 3/28/2013 12:02:44 A M 0.01 mg/L 1 0.01 0.1 Iron 3/28/2013 12:02:44 A M 0.05 mg/L 1 < 0.05 0 Lead 3/28/2013 12:02:44 A M 0.02 mg/L 1 < 0.02 0.1 Manganese 3/28/2013 12:02:44 A M 0.01 mg/L 1 25.4 0 Nickel 3/28/2013 12:02:44 A M 0.01 mg/L 1 < 0.01 0 Selenium 3/28/2013 12:02:44 A M 0.02 mg/L 1 0.06 3.4 Silver 3/28/2013 12:02:44 A M 0.005 mg/L 1 < 0.005 0.1 Zinc 3/28/2013 12:02:44 A M 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 4/1/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: MTM

Oil & Grease 3/26/2013 10:09:00 A M 5 mg/L 1 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 3/25/2013 9:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1303A22
Lab ID: G1303A22-002

DF 

# Geochemical Testing Date: 02-Apr-13

Received Date: 3/25/2013 4:12:53 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 3/26/2013 2:00:36 PM 200 mg/L 10 29500 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 3/26/2013 2:00:27 PM 200 mg/L 40 4660 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 3/27/2013 8:20:00 AM 3 mg/L 3 5 0 Finish Date/Time 3/27/2013 8:20:00 AM 0 mg/L 3 4/1/2013 08:45 

### INORGANIC METALS USGS I-1230-85 Analyst: HJC

Hexavalent Chromium 3/25/2013 5:30:00 PM 0.020 mg/L 1 < 0.020 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: CLS

Chloride 3/26/2013 10:58:00 A M 1000 mg/L 200 17700 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Iron, dissolved 3/28/2013 12:07:54 A M 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 3/28/2013 12:07:54 A M 0.02 mg/L 1 0.26 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 3/27/2013 11:09:00 A M 0.100 mg/L 500 0.109 0 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Aluminum 3/27/2013 9:40:23 PM 1.0 mg/L 1 63.8 0 Arsenic 3/27/2013 9:40:23 PM 0.20 mg/L 1 0.44 0 Beryllium 3/27/2013 9:40:23 PM 0.010 mg/L 1 < 0.010 0 Boron 3/27/2013 9:40:23 PM 0.50 mg/L 1 443 0 Cadmium 3/27/2013 9:40:23 PM 0.020 mg/L 1 0.043 0 Chromium 3/27/2013 9:40:23 PM 0.10 mg/L 1 0.45 0 Copper 3/27/2013 9:40:23 PM 0.10 mg/L 1 0.97 0 Iron 3/27/2013 9:40:23 PM 0.50 mg/L 1 276 0 Lead 3/27/2013 9:40:23 PM 0.20 mg/L 1 < 0.20 0 Manganese 3/27/2013 9:40:23 PM 0.10 mg/L 1 290 0 Nickel 3/27/2013 9:40:23 PM 0.10 mg/L 1 1.98 0 Selenium 3/27/2013 9:40:23 PM 0.20 mg/L 1 1.37 0 Silver 3/27/2013 9:40:23 PM 0.050 mg/L 1 < 0.050 0 Zinc 3/27/2013 9:40:23 PM 0.10 mg/L 1 1.10 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 4/1/2013 0.02 mg/L 1 0.45 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: MTM

Oil & Grease 3/26/2013 12:57:00 P M 18 mg/L 3.57 < 18 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Monday, April 15, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 Q(a) Order No.: G1304040 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 6 sample(s) on 4/1/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 8

### 15-Apr-13 Date: 

# Geochemical Testing
Project: Keystone 611 Q(a) CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1304040 

# CASE NARRATIVE

Samples were not filtered in the field for dissolved metals; samples were lab filtered. No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 8

### Project: Keystone 611 Q(a) Client Sample ID: Outfall 101

Collection Date: 4/1/2013 9:40:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1304040
Lab ID: G1304040-001

DF 

# Geochemical Testing Date: 15-Apr-13

Received Date: 4/1/2013 5:10:07 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: AM

Total suspended solids 4/2/2013 2:32:00 PM 1 mg/L 1 6 10 

### INORGANIC NON-METALS SM 2540 C Analyst: AM

Total dissolved solids 4/2/2013 2:32:18 PM 100 mg/L 5 29200 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: KMW

BOD 5-day 4/3/2013 8:00:00 AM 2 mg/L 1.5 < 2 25 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: MLR

Chloride 4/3/2013 9:09:00 AM 1000 mg/L 200 15100 

### INORGANIC METALS EPA 200.7 Analyst: MAS

Iron, dissolved 4/4/2013 3:47:06 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 4/4/2013 3:47:06 PM 0.02 mg/L 1 0.03 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 4/2/2013 11:10:03 AM 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: MAS

Aluminum 4/4/2013 3:44:33 PM 0.1 mg/L 1 < 0.1 0 Arsenic 4/4/2013 3:44:33 PM 0.02 mg/L 1 < 0.02 0 Beryllium 4/4/2013 3:44:33 PM 0.001 mg/L 1 < 0.001 0.8 Boron 4/5/2013 11:15:00 AM 2.50 mg/L 50 348 0 Cadmium 4/4/2013 3:44:33 PM 0.002 mg/L 1 < 0.002 0 Chromium 4/4/2013 3:44:33 PM 0.01 mg/L 1 < 0.01 0 Copper 4/4/2013 3:44:33 PM 0.01 mg/L 1 < 0.01 0.1 Iron 4/4/2013 3:44:33 PM 0.05 mg/L 1 < 0.05 0 Lead 4/4/2013 3:44:33 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 4/4/2013 3:44:33 PM 0.01 mg/L 1 33.5 0 Nickel 4/4/2013 3:44:33 PM 0.01 mg/L 1 0.01 0 Selenium 4/4/2013 3:44:33 PM 0.02 mg/L 1 0.04 3.4 Silver 4/4/2013 3:44:33 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 4/4/2013 3:44:33 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 4/8/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: MTM

Oil & Grease 4/3/2013 10:34:00 AM 5 mg/L 1 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 8

### Project: Keystone 611 Q(a) Client Sample ID: FGD Influent

Collection Date: 4/1/2013 9:30:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1304040
Lab ID: G1304040-002

DF 

# Geochemical Testing Date: 15-Apr-13

Received Date: 4/1/2013 5:10:07 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: AM

Total dissolved solids 4/2/2013 2:32:18 PM 100 mg/L 5 33500 0 

### PHYSICAL TESTS SM 2540D Analyst: AM

Total suspended solids 4/2/2013 2:31:58 PM 100 mg/L 20 19300 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: KMW

BOD 5-day 4/3/2013 8:00:00 AM 3 mg/L 3 9 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: MLR

Chloride 4/3/2013 9:09:00 AM 1000 mg/L 200 17400 

### INORGANIC METALS EPA 200.7 Analyst: MAS

Iron, dissolved 4/4/2013 3:49:40 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 4/4/2013 3:49:40 PM 0.02 mg/L 1 0.15 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 4/2/2013 11:11:40 AM 0.100 mg/L 500 0.520 0 

### INORGANIC METALS EPA 200.7 Analyst: MAS

Aluminum 4/8/2013 6:39:18 PM 1.0 mg/L 1 376 0 Arsenic 4/8/2013 6:39:18 PM 0.20 mg/L 1 1.94 0 Beryllium 4/8/2013 6:39:18 PM 0.010 mg/L 1 0.038 0 Boron 4/9/2013 4:34:10 PM 5.00 mg/L 10 492 0 Cadmium 4/8/2013 6:39:18 PM 0.020 mg/L 1 0.041 0 Chromium 4/8/2013 6:39:18 PM 0.10 mg/L 1 2.51 0 Copper 4/8/2013 6:39:18 PM 0.10 mg/L 1 3.09 0 Iron 4/8/2013 6:39:18 PM 0.50 mg/L 1 1530 0 Lead 4/8/2013 6:39:18 PM 0.20 mg/L 1 0.68 0 Manganese 4/8/2013 6:39:18 PM 0.10 mg/L 1 275 0 Nickel 4/8/2013 6:39:18 PM 0.10 mg/L 1 3.44 0 Selenium 4/8/2013 6:39:18 PM 0.20 mg/L 1 5.80 0 Silver 4/9/2013 4:39:19 PM 0.050 mg/L 1 < 0.050 0 Zinc 4/8/2013 6:39:18 PM 0.10 mg/L 1 4.27 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 4/10/2013 0.02 mg/L 1 2.51 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: MTM

Oil & Grease 4/3/2013 1:11:00 PM 23 mg/L 4.55 < 23 0

I.D. 56-00306 PA DEP 

# Page 4 of 8

### Project: Keystone 611 Q(a) Client Sample ID: Plum Creek

Collection Date: 4/1/2013 7:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1304040
Lab ID: G1304040-003

DF 

# Geochemical Testing Date: 15-Apr-13

Received Date: 4/1/2013 5:10:07 PM 

# Laboratory Results

Sampled By : Client

MCL
INORGANIC NON METALS SM 4500-CO2D Analyst: MBG

Bicarbonate 4/2/2013 9:44:00 PM 5 mg/L CaCO3 1 29 0 

### INORGANIC NON-METALS SM 4500-CO2 Analyst: MBG

Carbonate 4/2/2013 9:44:00 PM 5 mg/L CaCO3 1 < 5 0 

### PH BY SM 4500 H+B SM4500-H+B Analyst: MBG

Lab pH H 4/2/2013 9:44:00 PM 0 S.U. 1 7.71 0 

### INORGANIC NON-METALS SM 2540 C Analyst: AM

Total dissolved solids 4/2/2013 2:32:18 PM 20 mg/L 1 112 0 

### PHYSICAL TESTS SM 2540D Analyst: AM

Total suspended solids 4/2/2013 2:31:58 PM 10 mg/L 2 < 10 0 

### INORGANIC NON-METALS ASTM D1067-06 Analyst: MBG

Alkalinity to pH 4.5 4/2/2013 9:44:00 PM 5 mg/L CaCO3 1 29 0 

### INORGANIC NON-METALS EPA 300.0 Analyst: MLR

Nitrate Nitrogen 4/1/2013 7:33:00 PM 0.05 mg/L as N 1 0.47 0 Nitrite Nitrogen 4/1/2013 7:33:00 PM 0.05 mg/L as N 1 < 0.05 0 Nitrate - Nitrite 4/1/2013 7:33:00 PM 0.05 mg/L as N 1 0.47 0 

### INORGANIC NON-METALS EPA 300.0 Analyst: MLR

Chloride 4/1/2013 7:33:00 PM 1 mg/L 1 9 0 Fluoride 4/1/2013 7:33:00 PM 0.1 mg/L 1 < 0.1 0 Sulfate 4/1/2013 7:33:00 PM 2 mg/L 1 31 0 

### INORGANIC NON-METALS EPA 350.1 Analyst: SLY

Ammonia Nitrogen - Distilled 4/3/2013 8:00:26 AM 0.10 mg/L as N 1 < 0.10 0 

### INORGANIC METALS EPA 200.7 Analyst: MAS

Barium 4/4/2013 1:56:17 PM 0.01 mg/L 1 0.04 0 Boron 4/4/2013 1:56:17 PM 0.05 mg/L 1 < 0.05 0 Calcium 4/4/2013 1:56:17 PM 0.1 mg/L 1 16.1 0 Iron 4/4/2013 1:56:17 PM 0.05 mg/L 1 0.34 0 Magnesium 4/4/2013 1:56:17 PM 0.1 mg/L 1 5.0 0 Manganese 4/4/2013 1:56:17 PM 0.01 mg/L 1 0.10 0 Potassium 4/4/2013 1:56:17 PM 0.5 mg/L 1 1.3 0 Sodium 4/4/2013 1:56:17 PM 0.2 mg/L 1 11.4 0 Strontium 4/4/2013 1:56:17 PM 0.01 mg/L 1 0.14 0 

### INDICATOR ORGANIC PARAMETERS SM 20 5310-C Analyst: MTM

Total Organic Carbon 4/2/2013 8:48:00 PM 0.5 mg/L 1 1.4 0

I.D. 56-00306 PA DEP 

# Page 5 of 8

### Project: Keystone 611 Q(a) Client Sample ID: Crooked Creek

Collection Date: 4/1/2013 7:30:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1304040
Lab ID: G1304040-004

DF 

# Geochemical Testing Date: 15-Apr-13

Received Date: 4/1/2013 5:10:07 PM 

# Laboratory Results

Sampled By : Client

MCL
INORGANIC NON-METALS SM 2540 C Analyst: AM

Total dissolved solids 4/2/2013 2:32:17 PM 20 mg/L 1 146 0 

### PHYSICAL TESTS SM 2540D Analyst: AM

Total suspended solids 4/2/2013 2:31:57 PM 5 mg/L 1 35 0 

### INORGANIC NON-METALS ASTM D1067-06 Analyst: MBG

Alkalinity to pH 4.5 4/2/2013 9:48:00 PM 5 mg/L CaCO3 1 35 0 

### INORGANIC NON-METALS EPA 300.0 Analyst: MLR

Nitrate Nitrogen 4/1/2013 7:50:00 PM 0.05 mg/L as N 1 0.50 0 Nitrite Nitrogen 4/1/2013 7:50:00 PM 0.05 mg/L as N 1 < 0.05 0 Nitrate - Nitrite 4/1/2013 7:50:00 PM 0.05 mg/L as N 1 0.50 0 

### INORGANIC NON-METALS EPA 300.0 Analyst: MLR

Chloride 4/1/2013 7:50:00 PM 1 mg/L 1 19 0 Sulfate 4/1/2013 7:50:00 PM 2 mg/L 1 44 0 

### INORGANIC METALS EPA 200.7 Analyst: MAS

Calcium 4/4/2013 3:52:13 PM 0.1 mg/L 1 22.7 0 Iron 4/4/2013 3:52:13 PM 0.05 mg/L 1 1.70 0 Magnesium 4/4/2013 3:52:13 PM 0.1 mg/L 1 6.6 0 Manganese 4/4/2013 3:52:13 PM 0.01 mg/L 1 0.20 0 Potassium 4/4/2013 3:52:13 PM 0.5 mg/L 1 1.5 0 Sodium 4/4/2013 3:52:13 PM 0.2 mg/L 1 18.3 0 

### INDICATOR ORGANIC PARAMETERS SM 20 5310-C Analyst: MTM

Total Organic Carbon 4/2/2013 9:07:00 PM 0.5 mg/L 1 1.4 0

I.D. 56-00306 PA DEP 

# Page 6 of 8

### Project: Keystone 611 Q(a) Client Sample ID: West Valley Qtrly Leachate

Collection Date: 4/1/2013 8:15:00 AM Matrix: LEACHATE Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1304040
Lab ID: G1304040-005

DF 

# Geochemical Testing Date: 15-Apr-13

Received Date: 4/1/2013 5:10:07 PM 

# Laboratory Results

Sampled By : Client

MCL
INORGANIC NON-METALS ASTM D1067-06 Analyst: MBG

Alkalinity to pH 4.5 4/2/2013 9:51:00 PM 5 mg/L CaCO3 1 < 5 0 

### INORGANIC METALS EPA 200.7 Analyst: MAS

Iron 4/4/2013 1:58:52 PM 0.05 mg/L 1 0.46 0 Manganese 4/4/2013 1:58:52 PM 0.01 mg/L 1 6.73 0

I.D. 56-00306 PA DEP 

# Page 7 of 8

### Project: Keystone 611 Q(a) Client Sample ID: East Valley Qtrly Leachate

Collection Date: 4/1/2013 9:15:00 AM Matrix: LEACHATE Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1304040
Lab ID: G1304040-006

DF 

# Geochemical Testing Date: 15-Apr-13

Received Date: 4/1/2013 5:10:07 PM 

# Laboratory Results

Sampled By : Client

MCL
INORGANIC NON-METALS ASTM D1067-06 Analyst: MBG

Alkalinity to pH 4.5 4/2/2013 9:54:00 PM 5 mg/L CaCO3 1 64 0 

### INORGANIC METALS EPA 200.7 Analyst: MAS

Iron 4/4/2013 2:01:26 PM 0.05 mg/L 1 < 0.05 0 Manganese 4/4/2013 2:01:26 PM 0.01 mg/L 1 0.48 0

I.D. 56-00306 PA DEP 

# Page 8 of 8

# Thursday, April 18, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 Q(b) Order No.: G1304442 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 4/10/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 18-Apr-13 Date: 

# Geochemical Testing
Project: Keystone 611 Q(b) CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1304442 

# CASE NARRATIVE

Samples were not filtered in the field for dissolved metals; samples were lab filtered. No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 Q(b) Client Sample ID: FGD Influent

Collection Date: 4/9/2013 9:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1304442
Lab ID: G1304442-001

DF 

# Geochemical Testing Date: 18-Apr-13

Received Date: 4/10/2013 6:56:52 AM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 4/10/2013 2:29:28 PM 200 mg/L 10 30500 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 4/10/2013 12:37:15 P M 200 mg/L 40 17500 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 4/10/2013 12:56:00 P M 3 mg/L 3 8 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 4/12/2013 6:02:00 PM 1000 mg/L 200 14900 

### INORGANIC METALS EPA 200.7 Analyst: MAS

Iron, dissolved 4/12/2013 5:01:30 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 4/12/2013 5:01:30 PM 0.02 mg/L 1 0.21 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 4/15/2013 8:11:30 AM 0.100 mg/L 500 0.585 0 

### INORGANIC METALS EPA 200.7 Analyst: MAS

Aluminum 4/15/2013 6:21:06 PM 1.0 mg/L 1 307 0 Arsenic 4/15/2013 6:21:06 PM 0.20 mg/L 1 1.58 0 Beryllium 4/15/2013 6:21:06 PM 0.010 mg/L 1 0.028 0 Boron 4/16/2013 5:51:13 PM 5.00 mg/L 10 416 0 Cadmium 4/15/2013 6:21:06 PM 0.020 mg/L 1 0.037 0 Chromium 4/15/2013 6:21:06 PM 0.10 mg/L 1 1.94 0 Copper 4/15/2013 6:21:06 PM 0.10 mg/L 1 1.42 0 Iron 4/15/2013 6:21:06 PM 0.50 mg/L 1 1080 0 Lead 4/15/2013 6:21:06 PM 0.20 mg/L 1 0.55 0 Manganese 4/15/2013 6:21:06 PM 0.10 mg/L 1 182 0 Nickel 4/15/2013 6:21:06 PM 0.10 mg/L 1 2.36 0 Selenium 4/15/2013 6:21:06 PM 0.20 mg/L 1 4.67 0 Silver 4/15/2013 6:21:06 PM 0.050 mg/L 1 < 0.050 0 Zinc 4/15/2013 6:21:06 PM 0.10 mg/L 1 2.89 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 4/17/2013 0.02 mg/L 1 1.94 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: AJR

Oil & Grease 4/12/2013 2:06:00 PM 19 mg/L 3.85 < 19 0

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 Q(b) Client Sample ID: Outfall 101

Collection Date: 4/9/2013 9:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1304442
Lab ID: G1304442-002

DF 

# Geochemical Testing Date: 18-Apr-13

Received Date: 4/10/2013 6:56:52 AM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 4/10/2013 12:37:18 P M 1 mg/L 1 4 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 4/10/2013 2:29:29 PM 100 mg/L 5 31200 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 4/10/2013 12:56:00 P M 2 mg/L 1.5 < 2 25 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 4/12/2013 6:02:00 PM 1000 mg/L 200 14300 

### INORGANIC METALS EPA 200.7 Analyst: MAS

Iron, dissolved 4/12/2013 4:33:06 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 4/12/2013 4:33:06 PM 0.02 mg/L 1 0.05 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 4/15/2013 8:09:51 AM 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Aluminum 4/15/2013 7:03:00 PM 0.1 mg/L 1 < 0.1 0 Arsenic 4/12/2013 4:17:36 PM 0.02 mg/L 1 < 0.02 0 Beryllium 4/12/2013 4:17:36 PM 0.001 mg/L 1 < 0.001 0.8 Boron 4/12/2013 4:17:36 PM 0.05 mg/L 1 326 0 Cadmium 4/15/2013 7:03:00 PM 0.002 mg/L 1 < 0.002 0 Chromium 4/12/2013 4:17:36 PM 0.01 mg/L 1 < 0.01 0 Copper 4/12/2013 4:17:36 PM 0.01 mg/L 1 < 0.01 0.1 Iron 4/12/2013 4:17:36 PM 0.05 mg/L 1 < 0.05 0 Lead 4/12/2013 4:17:36 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 4/12/2013 4:17:36 PM 0.01 mg/L 1 18.5 0 Nickel 4/12/2013 4:17:36 PM 0.01 mg/L 1 < 0.01 0 Selenium 4/12/2013 4:17:36 PM 0.02 mg/L 1 0.06 3.4 Silver 4/15/2013 7:03:00 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 4/12/2013 4:17:36 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 4/17/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: AJR

Oil & Grease 4/12/2013 2:06:00 PM 5 mg/L 1.02 < 5 15

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Page 1 of 4 Wednesday , May08, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Keystone 611 W Order No.: G1304668 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 4/15/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA,and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Ti m ot hy W . Ber gst r

esser Di r

ect or of Techni cal Ser vi ces

# Page 2 of 4 08-May-13 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1304668 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit

# Page 3 of 4 Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 4/15/2013 8:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1304668
Lab ID: G1304668-001

DF 

# Geochemical Testing Date: 08-May-13

Received Date: 4/15/2013 4:21:24 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Anal yst: GMG

Total suspended solids 4/16/2013 12:41:05 P M 1 mg/L 1 7 10 

### INORGANIC NON-METALS SM 2540 C Anal yst: GMG

Total dissolved solids 4/16/2013 12:40:18 P M 100 mg/L 5 35300 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 4/17/2013 6:16:00 AM 2 mg/L 1.5 < 2 25 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 4/16/2013 2:54:00 PM 1000 mg/L 200 14700 

### INORGANIC METALS EPA 200.7 Anal yst: MAS

Iron, dissolved 4/17/2013 4:56:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 4/17/2013 4:56:00 PM 0.02 mg/L 1 0.08 0 

### INORGANIC METALS SM 3112B Anal yst: JEK

Mercury U 4/23/2013 9:20:42 AM 0.0002 mg/L 25 0.0025 0.004 

### INORGANIC METALS EPA 200.7 Anal yst: MAS

Aluminum 4/17/2013 4:52:00 PM 0.1 mg/L 1 < 0.1 0 Arsenic 4/17/2013 4:52:00 PM 0.02 mg/L 1 < 0.02 0 Beryllium 4/17/2013 4:52:00 PM 0.001 mg/L 1 < 0.001 0.8 Boron 4/18/2013 11:14:26 A M 2.50 mg/L 50 344 0 Cadmium 4/17/2013 4:52:00 PM 0.002 mg/L 1 < 0.002 0 Chromium 4/17/2013 4:52:00 PM 0.01 mg/L 1 < 0.01 0 Copper 4/17/2013 4:52:00 PM 0.01 mg/L 1 < 0.01 0.1 Iron 4/17/2013 4:52:00 PM 0.05 mg/L 1 < 0.05 0 Lead 4/17/2013 4:52:00 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 4/17/2013 4:52:00 PM 0.01 mg/L 1 10.4 0 Nickel 4/17/2013 4:52:00 PM 0.01 mg/L 1 < 0.01 0 Selenium 4/17/2013 4:52:00 PM 0.02 mg/L 1 0.08 3.4 Silver 4/17/2013 4:52:00 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 4/17/2013 4:52:00 PM 0.01 mg/L 1 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Anal yst: LAN

Trivalent Chromium 4/19/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Anal yst: AJR

Oil & Grease 4/18/2013 2:48:00 PM 5 mg/L 1 < 5 15

I.D. 56-00306 PA DEP

# Page 4 of 4 Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 4/15/2013 8:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1304668
Lab ID: G1304668-002

DF 

# Geochemical Testing Date: 08-May-13

Received Date: 4/15/2013 4:21:24 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Anal yst: GMG

Total dissolved solids 4/16/2013 12:40:17 P M 200 mg/L 10 37500 0 

### PHYSICAL TESTS SM 2540D Anal yst: GMG

Total suspended solids 4/16/2013 12:41:06 P M 200 mg/L 40 6660 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 4/17/2013 6:16:00 AM 3 mg/L 3 4 0 

### INORGANIC METALS USGS I-1230-85 Analyst: CLS

Hexavalent Chromium 4/15/2013 5:16:00 PM 0.020 mg/L 1 < 0.020 0 

### INORGANIC NON-METALS USGS I-1187-85 Anal yst: SEF

Chloride 4/16/2013 2:54:00 PM 1000 mg/L 200 16300 

### INORGANIC METALS EPA 200.7 Anal yst: MAS

Iron, dissolved 4/17/2013 5:01:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 4/17/2013 5:01:00 PM 0.02 mg/L 1 0.19 0 

### INORGANIC METALS SM 3112B Anal yst: JEK

Mercury 4/19/2013 9:20:51 AM 0.100 mg/L 500 0.260 0 

### INORGANIC METALS EPA 200.7 Analyst: JAS

Aluminum 4/19/2013 9:19:45 PM 1.0 mg/L 1 118 0 Arsenic 4/19/2013 9:19:45 PM 0.20 mg/L 1 0.73 0 Beryllium 4/19/2013 9:19:45 PM 0.010 mg/L 1 0.012 0 Boron 4/22/2013 12:34:39 P M 5.00 mg/L 10 429 0 Cadmium 4/19/2013 9:19:45 PM 0.020 mg/L 1 0.035 0 Chromium 4/19/2013 9:19:45 PM 0.10 mg/L 1 0.84 0 Copper 4/19/2013 9:19:45 PM 0.10 mg/L 1 1.11 0 Iron 4/19/2013 9:19:45 PM 0.50 mg/L 1 436 0 Lead 4/19/2013 9:19:45 PM 0.20 mg/L 1 < 0.20 0 Manganese 4/19/2013 9:19:45 PM 0.10 mg/L 1 147 0 Nickel 4/19/2013 9:19:45 PM 0.10 mg/L 1 1.65 0 Selenium 4/19/2013 9:19:45 PM 0.20 mg/L 1 2.73 0 Silver 4/19/2013 9:19:45 PM 0.050 mg/L 1 < 0.050 0 Zinc 4/19/2013 9:19:45 PM 0.10 mg/L 1 1.60 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Anal yst: LAN

Trivalent Chromium 4/22/2013 0.02 mg/L 1 0.84 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: AJR

Oil & Grease 4/18/2013 2:47:00 PM 18 mg/L 3.57 < 18 0

I.D. 56-00306 PA DEP

# Wednesday, May01, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1304A21 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 4/23/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 01-May-13 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1304A21 

# CASE NARRATIVE

Samples were not filtered in the field for dissolved metals; samples were lab filtered. No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 4/22/2013 9:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1304A21
Lab ID: G1304A21-001

DF 

# Geochemical Testing Date: 01-May-13

Received Date: 4/23/2013 5:53:01 AM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 4/23/2013 2:00:07 PM 1 mg/L 1 3 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 4/23/2013 2:00:36 PM 100 mg/L 5 23900 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: HJC

BOD 5-day 4/24/2013 8:29:00 AM 2 mg/L 1.5 < 2 25 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: CLS

Chloride 4/24/2013 1:03:00 PM 1000 mg/L 200 13700 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Iron, dissolved 4/25/2013 4:26:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 4/24/2013 4:57:26 PM 0.02 mg/L 1 0.05 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 4/23/2013 1:27:00 PM 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Aluminum 4/24/2013 4:54:52 PM 0.1 mg/L 1 < 0.1 0 Arsenic 4/24/2013 4:54:52 PM 0.02 mg/L 1 < 0.02 0 Beryllium 4/24/2013 4:54:52 PM 0.001 mg/L 1 < 0.001 0.8 Boron 4/25/2013 3:44:00 PM 2.50 mg/L 50 311 0 Cadmium 4/24/2013 4:54:52 PM 0.002 mg/L 1 < 0.002 0 Chromium 4/24/2013 4:54:52 PM 0.01 mg/L 1 < 0.01 0 Copper 4/24/2013 4:54:52 PM 0.01 mg/L 1 < 0.01 0.1 Iron 4/25/2013 3:46:00 PM 0.05 mg/L 1 < 0.05 0 Lead 4/24/2013 4:54:52 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 4/24/2013 4:54:52 PM 0.01 mg/L 1 6.72 0 Nickel 4/24/2013 4:54:52 PM 0.01 mg/L 1 < 0.01 0 Selenium 4/24/2013 4:54:52 PM 0.02 mg/L 1 0.05 3.4 Silver 4/24/2013 4:54:52 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 4/24/2013 4:54:52 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 4/26/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 4/26/2013 2:33:00 PM 5 mg/L 1.04 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 4/22/2013 9:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1304A21
Lab ID: G1304A21-002

DF 

# Geochemical Testing Date: 01-May-13

Received Date: 4/23/2013 5:53:01 AM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 4/23/2013 2:00:36 PM 200 mg/L 10 25100 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 4/23/2013 2:00:06 PM 200 mg/L 40 9440 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: HJC

BOD 5-day 4/24/2013 8:29:00 AM 3 mg/L 3 7 0 

### INORGANIC METALS USGS I-1230-85 Analyst: MLR

Hexavalent Chromium 4/23/2013 6:32:00 AM 0.020 mg/L 1 < 0.020 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: CLS

Chloride 4/24/2013 1:03:00 PM 1000 mg/L 200 14500 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Iron, dissolved 4/25/2013 6:26:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 4/24/2013 5:22:46 PM 0.02 mg/L 1 0.02 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 4/23/2013 1:28:38 PM 0.100 mg/L 500 0.351 0 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Aluminum 4/26/2013 5:48:10 PM 1.0 mg/L 1 182 0 Arsenic 4/26/2013 5:48:10 PM 0.20 mg/L 1 1.10 0 Beryllium 4/26/2013 5:48:10 PM 0.010 mg/L 1 0.018 0 Boron 4/29/2013 1:19:00 PM 5.00 mg/L 10 369 0 Cadmium 4/26/2013 5:48:10 PM 0.020 mg/L 1 0.031 0 Chromium 4/26/2013 5:48:10 PM 0.10 mg/L 1 0.96 0 Copper 4/26/2013 5:48:10 PM 0.10 mg/L 1 0.94 0 Iron 4/26/2013 5:48:10 PM 0.50 mg/L 1 485 0 Lead 4/26/2013 5:48:10 PM 0.20 mg/L 1 0.28 0 Manganese 4/26/2013 5:48:10 PM 0.10 mg/L 1 113 0 Nickel 4/26/2013 5:48:10 PM 0.10 mg/L 1 1.54 0 Selenium 4/26/2013 5:48:10 PM 0.20 mg/L 1 3.46 0 Silver 4/26/2013 5:48:10 PM 0.050 mg/L 1 < 0.050 0 Zinc 4/26/2013 5:48:10 PM 0.10 mg/L 1 1.93 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 4/29/2013 0.02 mg/L 1 0.96 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 4/26/2013 2:47:00 PM 19 mg/L 3.7 < 19 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Tuesday, May07, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 M(a) Order No.: G1304D24 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 4/29/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 07-May-13 Date: 

# Geochemical Testing
Project: Keystone 611 M(a) CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1304D24 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 M(a) Client Sample ID: Outfall 101

Collection Date: 4/29/2013 9:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1304D24
Lab ID: G1304D24-001

DF 

# Geochemical Testing Date: 07-May-13

Received Date: 4/29/2013 6:35:29 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 4/30/2013 2:30:00 PM 1 mg/L 1 3 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 4/30/2013 2:30:00 PM 20 mg/L 1 4490 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 5/1/2013 6:19:00 AM 2 mg/L 1.5 < 2 25 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: CLS

Chloride 5/1/2013 9:55:00 AM 1000 mg/L 200 11900 

### INORGANIC METALS EPA 200.7 Analyst: MS

Iron, dissolved 5/2/2013 12:27:00 AM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 5/2/2013 12:27:00 AM 0.02 mg/L 1 0.09 0 

### INORGANIC METALS SM 3112B Analyst: MBG

Mercury 5/2/2013 12:50:59 PM 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: MS

Aluminum 5/1/2013 10:48:00 PM 0.1 mg/L 1 < 0.1 0 Arsenic 5/1/2013 10:48:00 PM 0.02 mg/L 1 < 0.02 0 Beryllium 5/1/2013 10:48:00 PM 0.001 mg/L 1 < 0.001 0.8 Boron 5/2/2013 12:28:26 PM 2.50 mg/L 50 287 0 Cadmium 5/1/2013 10:48:00 PM 0.002 mg/L 1 < 0.002 0 Chromium 5/1/2013 10:48:00 PM 0.01 mg/L 1 < 0.01 0 Copper 5/1/2013 10:48:00 PM 0.01 mg/L 1 < 0.01 0.1 Iron 5/1/2013 10:48:00 PM 0.05 mg/L 1 < 0.05 0 Lead 5/1/2013 10:48:00 PM 0.02 mg/L 1 0.02 0.1 Manganese 5/1/2013 10:48:00 PM 0.01 mg/L 1 4.99 0 Nickel 5/1/2013 10:48:00 PM 0.01 mg/L 1 0.01 0 Selenium 5/1/2013 10:48:00 PM 0.02 mg/L 1 0.08 3.4 Silver 5/1/2013 10:48:00 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 5/1/2013 10:48:00 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 5/3/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 5/3/2013 7:26:00 AM 5 mg/L 1.02 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 M(a) Client Sample ID: FGD Influent

Collection Date: 4/29/2013 9:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1304D24
Lab ID: G1304D24-002

DF 

# Geochemical Testing Date: 07-May-13

Received Date: 4/29/2013 6:35:29 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 4/30/2013 2:30:00 PM 100 mg/L 5 23400 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 4/30/2013 2:30:00 PM 100 mg/L 20 8720 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 5/1/2013 6:19:00 AM 3 mg/L 3 < 3 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: CLS

Chloride 5/1/2013 9:55:00 AM 1000 mg/L 200 12700 

### INORGANIC METALS EPA 200.7 Analyst: MS

Iron, dissolved 5/2/2013 1:07:00 AM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 5/2/2013 1:07:00 AM 0.02 mg/L 1 0.13 0 

### INORGANIC METALS SM 3112B Analyst: MBG

Mercury 5/2/2013 12:52:36 PM 0.100 mg/L 500 0.408 0 

### INORGANIC METALS EPA 200.7 Analyst: MS

Aluminum 5/2/2013 1:32:00 AM 1.0 mg/L 1 168 0 Arsenic 5/2/2013 1:32:00 AM 0.20 mg/L 1 1.09 0 Beryllium 5/2/2013 1:32:00 AM 0.010 mg/L 1 0.013 0 Boron 5/2/2013 12:36:07 PM 5.00 mg/L 10 272 0 Cadmium 5/2/2013 1:32:00 AM 0.020 mg/L 1 < 0.020 0 Chromium 5/2/2013 1:32:00 AM 0.10 mg/L 1 1.12 0 Copper 5/2/2013 1:32:00 AM 0.10 mg/L 1 0.64 0 Iron 5/2/2013 1:32:00 AM 0.50 mg/L 1 462 0 Lead 5/2/2013 1:32:00 AM 0.20 mg/L 1 0.32 0 Manganese 5/2/2013 1:32:00 AM 0.10 mg/L 1 73.5 0 Nickel 5/2/2013 1:32:00 AM 0.10 mg/L 1 1.32 0 Selenium 5/2/2013 1:32:00 AM 0.20 mg/L 1 3.02 0 Silver 5/2/2013 1:32:00 AM 0.050 mg/L 1 < 0.050 0 Zinc 5/2/2013 1:32:00 AM 0.10 mg/L 1 1.77 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 5/3/2013 0.02 mg/L 1 0.66 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 5/3/2013 7:26:00 AM 19 mg/L 3.7 < 19 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Friday, May17, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 M(a) Order No.: G1305245 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 5/7/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 17-May-13 Date: 

# Geochemical Testing
Project: Keystone 611 M(a) CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1305245 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 M(a) Client Sample ID: Outfall 101

Collection Date: 5/6/2013 9:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1305245
Lab ID: G1305245-001

DF 

# Geochemical Testing Date: 17-May-13

Received Date: 5/7/2013 6:51:48 AM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 5/7/2013 2:40:48 PM 1 mg/L 1 1 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 5/7/2013 2:40:01 PM 20 mg/L 1 26000 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 5/8/2013 5:11:00 AM 2 mg/L 1.5 < 2 25 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 5/7/2013 9:29:00 AM 1000 mg/L 200 14100 

### INORGANIC METALS EPA 200.7 Analyst: JAS

Iron, dissolved 5/9/2013 4:31:18 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 5/9/2013 4:31:18 PM 0.02 mg/L 1 0.07 0 

### INORGANIC METALS SM 3112B Analyst: MBG

Mercury 5/9/2013 10:51:01 AM 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: JAS

Aluminum 5/9/2013 4:28:43 PM 0.1 mg/L 1 < 0.1 0 Arsenic 5/9/2013 4:28:43 PM 0.02 mg/L 1 < 0.02 0 Beryllium 5/9/2013 4:28:43 PM 0.001 mg/L 1 < 0.001 0.8 Boron 5/10/2013 2:23:00 PM 2.50 mg/L 50 294 0 Cadmium 5/9/2013 4:28:43 PM 0.002 mg/L 1 0.003 0 Chromium 5/9/2013 4:28:43 PM 0.01 mg/L 1 < 0.01 0 Copper 5/9/2013 4:28:43 PM 0.01 mg/L 1 < 0.01 0.1 Iron 5/9/2013 4:28:43 PM 0.05 mg/L 1 < 0.05 0 Lead 5/9/2013 4:28:43 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 5/9/2013 4:28:43 PM 0.01 mg/L 1 2.74 0 Nickel 5/9/2013 4:28:43 PM 0.01 mg/L 1 < 0.01 0 Selenium 5/9/2013 4:28:43 PM 0.02 mg/L 1 0.08 3.4 Silver 5/9/2013 4:28:43 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 5/9/2013 4:28:43 PM 0.01 mg/L 1 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 5/15/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 5/9/2013 6:46:00 AM 5 mg/L 1.02 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 M(a) Client Sample ID: FGD Influent

Collection Date: 5/6/2013 9:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1305245
Lab ID: G1305245-002

DF 

# Geochemical Testing Date: 17-May-13

Received Date: 5/7/2013 6:51:48 AM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 5/7/2013 2:40:00 PM 200 mg/L 10 33300 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 5/7/2013 2:40:34 PM 200 mg/L 40 3540 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 5/8/2013 5:11:00 AM 3 mg/L 3 < 3 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 5/7/2013 9:29:00 AM 1000 mg/L 200 11800 

### INORGANIC METALS EPA 200.7 Analyst: JAS

Iron, dissolved 5/9/2013 4:33:52 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 5/9/2013 4:33:52 PM 0.02 mg/L 1 0.07 0 

### INORGANIC METALS SM 3112B Analyst: MBG

Mercury 5/9/2013 11:00:42 AM 0.100 mg/L 500 0.153 0 

### INORGANIC METALS EPA 200.7 Analyst: JAS

Aluminum 5/8/2013 4:30:15 PM 1.0 mg/L 1 67.2 0 Arsenic 5/8/2013 4:30:15 PM 0.20 mg/L 1 0.45 0 Beryllium 5/8/2013 4:30:15 PM 0.010 mg/L 1 < 0.010 0 Boron 5/9/2013 2:44:22 PM 5.00 mg/L 10 404 0 Cadmium 5/8/2013 4:30:15 PM 0.020 mg/L 1 0.037 0 Chromium 5/8/2013 4:30:15 PM 0.10 mg/L 1 0.45 0 Copper 5/8/2013 4:30:15 PM 0.10 mg/L 1 0.67 0 Iron 5/8/2013 4:30:15 PM 0.50 mg/L 1 196 0 Lead 5/8/2013 4:30:15 PM 0.20 mg/L 1 < 0.20 0 Manganese 5/8/2013 4:30:15 PM 0.10 mg/L 1 107 0 Nickel 5/8/2013 4:30:15 PM 0.10 mg/L 1 1.28 0 Selenium 5/8/2013 4:30:15 PM 0.20 mg/L 1 1.43 0 Silver 5/8/2013 4:30:15 PM 0.050 mg/L 1 < 0.050 0 Zinc 5/8/2013 4:30:15 PM 0.10 mg/L 1 1.70 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 5/15/2013 0.02 mg/L 1 0.44 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 5/9/2013 6:46:00 AM 19 mg/L 3.85 < 19 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Wednesday, May22, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1305570 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 5/13/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 22-May-13 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1305570 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 5/13/2013 9:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1305570
Lab ID: G1305570-001

DF 

# Geochemical Testing Date: 22-May-13

Received Date: 5/13/2013 5:09:47 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: GMG

Total suspended solids 5/14/2013 12:12:07 P M 1 mg/L 1 2 10 

### INORGANIC NON-METALS SM 2540 C Analyst: GMG

Total dissolved solids 5/14/2013 2:19:31 PM 100 mg/L 5 22600 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 5/15/2013 5:29:00 AM 2 mg/L 1.5 < 2 25 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 5/14/2013 10:06:00 A M 1000 mg/L 200 13700 

### INORGANIC METALS EPA 200.7 Analyst: JEK

Iron, dissolved 5/15/2013 6:34:00 AM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 5/15/2013 6:34:00 AM 0.02 mg/L 1 0.09 0 

### INORGANIC METALS SM 3112B Analyst: MBG

Mercury 5/14/2013 1:02:48 PM 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: JEK

Aluminum 5/15/2013 5:33:00 AM 0.1 mg/L 1 < 0.1 0 Arsenic 5/15/2013 5:33:00 AM 0.02 mg/L 1 < 0.02 0 Beryllium 5/15/2013 5:33:00 AM 0.001 mg/L 1 < 0.001 0.8 Boron 5/15/2013 8:37:00 PM 2.50 mg/L 50 260 0 Cadmium 5/15/2013 5:33:00 AM 0.002 mg/L 1 < 0.002 0 Chromium 5/15/2013 5:33:00 AM 0.01 mg/L 1 < 0.01 0 Copper 5/15/2013 5:33:00 AM 0.01 mg/L 1 < 0.01 0.1 Iron 5/15/2013 5:33:00 AM 0.05 mg/L 1 < 0.05 0 Lead 5/15/2013 5:33:00 AM 0.02 mg/L 1 < 0.02 0.1 Manganese 5/15/2013 5:33:00 AM 0.01 mg/L 1 2.16 0 Nickel 5/15/2013 5:33:00 AM 0.01 mg/L 1 < 0.01 0 Selenium 5/15/2013 5:33:00 AM 0.02 mg/L 1 0.09 3.4 Silver 5/15/2013 5:33:00 AM 0.005 mg/L 1 < 0.005 0.1 Zinc 5/15/2013 5:33:00 AM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 5/20/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 5/17/2013 2:07:00 PM 5 mg/L 1 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 5/13/2013 9:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1305570
Lab ID: G1305570-002

DF 

# Geochemical Testing Date: 22-May-13

Received Date: 5/13/2013 5:09:47 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: GMG

Total dissolved solids 5/14/2013 2:19:31 PM 100 mg/L 5 22900 0 

### PHYSICAL TESTS SM 2540D Analyst: GMG

Total suspended solids 5/14/2013 12:12:06 P M 100 mg/L 20 15000 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 5/15/2013 5:29:00 AM 2 mg/L 1.5 < 2 0 

### INORGANIC METALS USGS I-1230-85 Analyst: CLS

Hexavalent Chromium 5/13/2013 6:14:00 PM 0.020 mg/L 1 < 0.020 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 5/14/2013 10:06:00 A M 1000 mg/L 200 15300 

### INORGANIC METALS EPA 200.7 Analyst: JEK

Iron, dissolved 5/15/2013 7:36:00 AM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 5/15/2013 7:36:00 AM 0.02 mg/L 1 0.26 0 

### INORGANIC METALS SM 3112B Analyst: MBG

Mercury 5/14/2013 1:10:59 PM 0.100 mg/L 500 0.835 0 

### INORGANIC METALS EPA 200.7 Analyst: JEK

Aluminum 5/18/2013 8:12:00 AM 1.0 mg/L 1 364 0 Arsenic 5/18/2013 8:12:00 AM 0.20 mg/L 1 2.35 0 Beryllium 5/18/2013 8:12:00 AM 0.010 mg/L 1 0.028 0 Boron 5/20/2013 4:07:08 PM 5.00 mg/L 10 413 0 Cadmium 5/18/2013 8:12:00 AM 0.020 mg/L 1 0.020 0 Chromium 5/18/2013 8:12:00 AM 0.10 mg/L 1 2.41 0 Copper 5/18/2013 8:12:00 AM 0.10 mg/L 1 1.51 0 Iron 5/18/2013 8:12:00 AM 0.50 mg/L 1 865 0 Lead 5/18/2013 8:12:00 AM 0.20 mg/L 1 0.75 0 Manganese 5/18/2013 8:12:00 AM 0.10 mg/L 1 91.3 0 Nickel 5/18/2013 8:12:00 AM 0.10 mg/L 1 2.33 0 Selenium 5/18/2013 8:12:00 AM 0.20 mg/L 1 5.85 0 Silver 5/20/2013 4:09:43 PM 0.050 mg/L 1 < 0.050 0 Zinc 5/18/2013 8:12:00 AM 0.10 mg/L 1 3.73 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 5/20/2013 0.02 mg/L 1 2.41 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 5/17/2013 2:08:00 PM 19 mg/L 3.85 < 19 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Tuesday, June 04, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1305895 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 5/20/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 04-Jun-13 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1305895 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 5/20/2013 9:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1305895
Lab ID: G1305895-001

DF 

# Geochemical Testing Date: 04-Jun-13

Received Date: 5/20/2013 6:10:59 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 5/21/2013 1:36:37 PM 1 mg/L 1 4 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 5/21/2013 1:36:12 PM 20 mg/L 1 21200 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 5/22/2013 4:15:00 AM 2 mg/L 1.5 < 2 25 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 5/20/2013 6:49:00 PM 1000 mg/L 200 11000 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Iron, dissolved 5/22/2013 11:22:50 A M 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 5/22/2013 11:22:50 A M 0.02 mg/L 1 0.08 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 5/21/2013 10:53:05 A M 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Aluminum 5/22/2013 11:20:16 A M 0.1 mg/L 1 < 0.1 0 Arsenic 5/22/2013 11:20:16 A M 0.02 mg/L 1 < 0.02 0 Beryllium 5/22/2013 11:20:16 A M 0.001 mg/L 1 < 0.001 0.8 Boron 5/23/2013 1:35:00 PM 5.00 mg/L 100 277 0 Cadmium 5/22/2013 11:20:16 A M 0.002 mg/L 1 0.003 0 Chromium 5/22/2013 11:20:16 A M 0.01 mg/L 1 < 0.01 0 Copper 5/22/2013 11:20:16 A M 0.01 mg/L 1 < 0.01 0.1 Iron 5/22/2013 11:20:16 A M 0.05 mg/L 1 < 0.05 0 Lead 5/22/2013 11:20:16 A M 0.02 mg/L 1 < 0.02 0.1 Manganese 5/22/2013 11:20:16 A M 0.01 mg/L 1 3.68 0 Nickel 5/22/2013 11:20:16 A M 0.01 mg/L 1 < 0.01 0 Selenium 5/22/2013 11:20:16 A M 0.02 mg/L 1 0.08 3.4 Silver 5/22/2013 11:20:16 A M 0.005 mg/L 1 < 0.005 0.1 Zinc 5/22/2013 11:20:16 A M 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 5/23/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 5/30/2013 1:24:00 PM 5 mg/L 1.03 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 5/20/2013 9:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1305895
Lab ID: G1305895-002

DF 

# Geochemical Testing Date: 04-Jun-13

Received Date: 5/20/2013 6:10:59 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 5/21/2013 1:36:12 PM 100 mg/L 5 32100 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 5/21/2013 1:36:36 PM 100 mg/L 20 11300 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 5/22/2013 4:15:00 AM 3 mg/L 3 4 0 

### INORGANIC METALS USGS I-1230-85 Analyst: SEF

Hexavalent Chromium 5/20/2013 6:43:00 PM 0.020 mg/L 1 < 0.020 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 5/20/2013 6:49:00 PM 1000 mg/L 200 17300 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Iron, dissolved 5/22/2013 11:51:07 A M 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 5/22/2013 11:51:07 A M 0.02 mg/L 1 0.29 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 5/21/2013 10:54:44 A M 0.100 mg/L 500 0.900 0 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Aluminum 5/23/2013 11:08:00 P M 1.0 mg/L 1 300 0 Arsenic 5/23/2013 11:08:00 P M 0.20 mg/L 1 2.04 0 Beryllium 5/23/2013 11:08:00 P M 0.010 mg/L 1 0.030 0 Boron 5/24/2013 2:29:44 PM 5.00 mg/L 10 498 0 Cadmium 5/24/2013 2:29:44 PM 0.200 mg/L 10 < 0.200 0 Chromium 5/23/2013 11:08:00 P M 0.10 mg/L 1 2.09 0 Copper 5/23/2013 11:08:00 P M 0.10 mg/L 1 1.33 0 Iron 5/23/2013 11:08:00 P M 0.50 mg/L 1 673 0 Lead 5/23/2013 11:08:00 P M 0.20 mg/L 1 0.67 0 Manganese 5/23/2013 11:08:00 P M 0.10 mg/L 1 92.5 0 Nickel 5/23/2013 11:08:00 P M 0.10 mg/L 1 2.43 0 Selenium 5/24/2013 2:29:44 PM 2.00 mg/L 10 7.21 0 Silver 5/23/2013 11:08:00 P M 0.050 mg/L 1 < 0.050 0 Zinc 5/23/2013 11:08:00 P M 0.10 mg/L 1 3.53 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 5/28/2013 0.02 mg/L 1 2.09 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 5/30/2013 1:24:00 PM 24 mg/L 4.76 < 24 0 NOTES: The pH of the sample was >2.

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Thursday, June 13, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1305C13 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 5/28/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 13-Jun-13 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1305C13 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 5/28/2013 11:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1305C13
Lab ID: G1305C13-001

DF 

# Geochemical Testing Date: 13-Jun-13

Received Date: 5/28/2013 6:12:48 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 5/29/2013 2:58:29 PM 1 mg/L 1 5 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 5/29/2013 2:58:45 PM 100 mg/L 5 25500 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 5/29/2013 8:09:00 AM 2 mg/L 1.5 < 2 25 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SAG

Chloride 5/29/2013 1:40:00 PM 1000 mg/L 200 14300 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Iron, dissolved 6/3/2013 7:59:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 6/3/2013 7:59:00 PM 0.02 mg/L 1 0.10 0 

### INORGANIC METALS SM 3112B Analyst: MBG

Mercury 6/3/2013 10:48:18 AM 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Aluminum 6/3/2013 7:35:00 PM 0.1 mg/L 1 < 0.1 0 Arsenic 6/3/2013 7:35:00 PM 0.02 mg/L 1 < 0.02 0 Beryllium 6/3/2013 7:35:00 PM 0.001 mg/L 1 < 0.001 0.8 Boron 6/4/2013 11:35:08 AM 5.00 mg/L 100 313 0 Cadmium 6/3/2013 7:35:00 PM 0.002 mg/L 1 < 0.002 0 Chromium 6/3/2013 7:35:00 PM 0.01 mg/L 1 < 0.01 0 Copper 6/3/2013 7:35:00 PM 0.01 mg/L 1 < 0.01 0.1 Iron 6/3/2013 7:35:00 PM 0.05 mg/L 1 < 0.05 0 Lead 6/3/2013 7:35:00 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 6/3/2013 7:35:00 PM 0.01 mg/L 1 1.58 0 Nickel 6/3/2013 7:35:00 PM 0.01 mg/L 1 < 0.01 0 Selenium 6/3/2013 7:35:00 PM 0.02 mg/L 1 0.10 3.4 Silver 6/3/2013 7:35:00 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 6/3/2013 7:35:00 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 6/11/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 6/3/2013 4:42:00 PM 5 mg/L 1 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 5/28/2013 11:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1305C13
Lab ID: G1305C13-002

DF 

# Geochemical Testing Date: 13-Jun-13

Received Date: 5/28/2013 6:12:48 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 5/29/2013 2:58:45 PM 100 mg/L 5 26400 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 5/29/2013 2:58:26 PM 100 mg/L 20 5680 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 5/29/2013 8:09:00 AM 3 mg/L 3 < 3 0 

### INORGANIC METALS USGS I-1230-85 Analyst: HJC

Hexavalent Chromium 5/28/2013 6:55:00 PM 0.020 mg/L 1 < 0.020 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SAG

Chloride 5/29/2013 1:40:00 PM 1000 mg/L 200 15800 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Iron, dissolved 6/3/2013 8:35:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 6/3/2013 8:35:00 PM 0.02 mg/L 1 0.23 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 5/29/2013 1:26:50 PM 0.100 mg/L 500 0.203 0 

### INORGANIC METALS EPA 200.7 Analyst: JAS

Aluminum 5/31/2013 9:20:22 PM 1.0 mg/L 1 101 0 Arsenic 5/31/2013 9:20:22 PM 0.20 mg/L 1 0.55 0 Beryllium 5/31/2013 9:20:22 PM 0.010 mg/L 1 < 0.010 0 Boron 6/4/2013 1:44:05 PM 5.00 mg/L 10 413 0 Cadmium 5/31/2013 9:20:22 PM 0.020 mg/L 1 0.037 0 Chromium 5/31/2013 9:20:22 PM 0.10 mg/L 1 0.67 0 Copper 5/31/2013 9:20:22 PM 0.10 mg/L 1 0.53 0 Iron 5/31/2013 9:20:22 PM 0.50 mg/L 1 270 0 Lead 5/31/2013 9:20:22 PM 0.20 mg/L 1 0.21 0 Manganese 5/31/2013 9:20:22 PM 0.10 mg/L 1 87.3 0 Nickel 5/31/2013 9:20:22 PM 0.10 mg/L 1 1.57 0 Selenium 5/31/2013 9:20:22 PM 0.20 mg/L 1 2.08 0 Silver 5/31/2013 9:20:22 PM 0.050 mg/L 1 < 0.050 0 Zinc 5/31/2013 9:20:22 PM 0.10 mg/L 1 2.55 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 6/4/2013 0.02 mg/L 1 0.67 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 6/3/2013 4:43:00 PM 18 mg/L 3.57 < 18 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Friday, June 14, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 M(a) Order No.: G1306056 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 3 sample(s) on 6/3/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 5

### 14-Jun-13 Date: 

# Geochemical Testing
Project: Keystone 611 M(a) CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1306056 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 5

### Project: Keystone 611 M(a) Client Sample ID: Outfall 101

Collection Date: 6/3/2013 9:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1306056
Lab ID: G1306056-001

DF 

# Geochemical Testing Date: 14-Jun-13

Received Date: 6/3/2013 5:12:18 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 6/4/2013 2:22:08 PM 1 mg/L 1 < 1 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 6/4/2013 2:21:19 PM 100 mg/L 5 34200 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 6/5/2013 6:35:00 AM 2 mg/L 1.5 < 2 25 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: CLS

Chloride 6/4/2013 10:42:00 AM 1000 mg/L 200 13100 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Iron, dissolved 6/5/2013 11:46:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 6/5/2013 11:46:00 PM 0.02 mg/L 1 0.09 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 6/6/2013 8:28:15 AM 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Aluminum 6/5/2013 11:35:00 PM 0.1 mg/L 1 < 0.1 0 Arsenic 6/5/2013 11:35:00 PM 0.02 mg/L 1 < 0.02 0 Beryllium 6/5/2013 11:35:00 PM 0.001 mg/L 1 < 0.001 0.8 Boron 6/6/2013 12:12:35 PM 2.50 mg/L 50 306 0 Cadmium 6/5/2013 11:35:00 PM 0.002 mg/L 1 < 0.002 0 Chromium 6/5/2013 11:35:00 PM 0.01 mg/L 1 < 0.01 0 Copper 6/5/2013 11:35:00 PM 0.01 mg/L 1 < 0.01 0.1 Iron 6/5/2013 11:35:00 PM 0.05 mg/L 1 < 0.05 0 Lead 6/5/2013 11:35:00 PM 0.02 mg/L 1 0.02 0.1 Manganese 6/5/2013 11:35:00 PM 0.01 mg/L 1 0.51 0 Nickel 6/5/2013 11:35:00 PM 0.01 mg/L 1 < 0.01 0 Selenium 6/5/2013 11:35:00 PM 0.02 mg/L 1 0.10 3.4 Silver 6/5/2013 11:35:00 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 6/5/2013 11:35:00 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 6/11/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 6/6/2013 8:36:00 AM 5 mg/L 1.01 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 5

### Project: Keystone 611 M(a) Client Sample ID: FGD Influent

Collection Date: 6/3/2013 9:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1306056
Lab ID: G1306056-002

DF 

# Geochemical Testing Date: 14-Jun-13

Received Date: 6/3/2013 5:12:18 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 6/4/2013 2:21:19 PM 100 mg/L 5 38900 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 6/4/2013 2:22:02 PM 100 mg/L 20 17100 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 6/5/2013 6:35:00 AM 3 mg/L 3 < 3 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: CLS

Chloride 6/4/2013 10:42:00 AM 1000 mg/L 200 15000 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Iron, dissolved 6/6/2013 12:13:00 AM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 6/6/2013 12:13:00 AM 0.02 mg/L 1 0.27 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 6/6/2013 9:58:06 AM 0.100 mg/L 500 0.750 0 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Aluminum 6/11/2013 6:46:21 PM 1.0 mg/L 1 357 0 Arsenic 6/11/2013 6:46:21 PM 0.20 mg/L 1 2.08 0 Beryllium 6/11/2013 6:46:21 PM 0.010 mg/L 1 0.029 0 Boron 6/12/2013 12:13:59 P M 5.00 mg/L 10 483 0 Cadmium 6/11/2013 6:46:21 PM 0.020 mg/L 1 0.043 0 Chromium 6/11/2013 6:46:21 PM 0.10 mg/L 1 2.22 0 Copper 6/11/2013 6:46:21 PM 0.10 mg/L 1 1.64 0 Iron 6/11/2013 6:46:21 PM 0.50 mg/L 1 846 0 Lead 6/11/2013 6:46:21 PM 0.20 mg/L 1 0.78 0 Manganese 6/11/2013 6:46:21 PM 0.10 mg/L 1 85.3 0 Nickel 6/11/2013 6:46:21 PM 0.10 mg/L 1 2.48 0 Selenium 6/12/2013 12:16:33 P M 0.20 mg/L 1 5.60 0 Silver 6/11/2013 6:46:21 PM 0.050 mg/L 1 < 0.050 0 Zinc 6/11/2013 6:46:21 PM 0.10 mg/L 1 4.07 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 6/13/2013 0.02 mg/L 1 2.22 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 6/6/2013 8:38:00 AM 18 mg/L 3.57 < 18 0

I.D. 56-00306 PA DEP 

# Page 4 of 5

### Project: Keystone 611 M(a) Client Sample ID: Plum Creek

Collection Date: 6/3/2013 10:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1306056
Lab ID: G1306056-003

DF 

# Geochemical Testing Date: 14-Jun-13

Received Date: 6/3/2013 5:12:18 PM 

# Laboratory Results

Sampled By : Client

MCL
INORGANIC NON METALS SM 4500-CO2D Analyst: MBG

Bicarbonate 6/4/2013 7:00:00 PM 5 mg/L CaCO3 1 38 0 

### INORGANIC NON-METALS SM 4500-CO2 Analyst: MBG

Carbonate 6/4/2013 7:00:00 PM 5 mg/L CaCO3 1 < 5 0 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 6/4/2013 2:21:19 PM 20 mg/L 1 142 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 6/4/2013 2:22:02 PM 5 mg/L 1 < 5 0 

### INORGANIC NON-METALS ASTM D1067-06 Analyst: MBG

Alkalinity to pH 4.5 6/4/2013 7:00:00 PM 5 mg/L CaCO3 1 38 0 

### INORGANIC NON-METALS EPA 300.0 Analyst: MLR

Nitrate Nitrogen 6/3/2013 7:42:00 PM 0.05 mg/L as N 1 0.27 0 Nitrite Nitrogen 6/3/2013 7:42:00 PM 0.05 mg/L as N 1 < 0.05 0 Nitrate - Nitrite 6/3/2013 7:42:00 PM 0.05 mg/L as N 1 0.27 0 

### INORGANIC NON-METALS EPA 300.0 Analyst: MLR

Chloride 6/3/2013 7:42:00 PM 1 mg/L 1 9 0 Fluoride 6/3/2013 7:42:00 PM 0.1 mg/L 1 < 0.1 0 Sulfate 6/3/2013 7:42:00 PM 2 mg/L 1 48 0 

### INORGANIC NON-METALS EPA 350.1 Analyst: SLY

Ammonia Nitrogen - Distilled 6/4/2013 12:53:16 PM 0.10 mg/L as N 1 0.18 0 

### INORGANICS NON METALS SM 4500-SIO2 C Analyst: MLR

Silica, total 6/4/2013 11:50:00 AM 0.20 mg/L 1 3.3 0 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Barium 6/5/2013 11:21:00 PM 0.01 mg/L 1 0.04 0 Boron 6/6/2013 12:04:51 PM 0.05 mg/L 1 < 0.05 0 Calcium 6/5/2013 11:21:00 PM 0.1 mg/L 1 18.9 0 Iron 6/5/2013 11:21:00 PM 0.05 mg/L 1 0.25 0 Magnesium 6/5/2013 11:21:00 PM 0.1 mg/L 1 5.6 0 Manganese 6/5/2013 11:21:00 PM 0.01 mg/L 1 0.06 0 Potassium 6/5/2013 11:21:00 PM 0.5 mg/L 1 1.4 0 Sodium 6/5/2013 11:21:00 PM 0.2 mg/L 1 16.8 0 Strontium 6/5/2013 11:21:00 PM 0.01 mg/L 1 0.20 0 

### INDICATOR ORGANIC PARAMETERS SM 20 5310-C Analyst: MTM

Total Organic Carbon 6/6/2013 4:19:00 PM 0.5 mg/L 1 2.2 0

I.D. 56-00306 PA DEP 

# Page 5 of 5

# Friday, June 21, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 M(b) Order No.: G1306377 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 6/10/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 21-Jun-13 Date: 

# Geochemical Testing
Project: Keystone 611 M(b) CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1306377 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 M(b) Client Sample ID: Outfall 101

Collection Date: 6/10/2013 9:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1306377
Lab ID: G1306377-001

DF 

# Geochemical Testing Date: 21-Jun-13

Received Date: 6/10/2013 4:42:22 PM 

# Laboratory Results

Sampled By : Water Lab

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 6/11/2013 2:48:48 PM 1 mg/L 1 3 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 6/11/2013 2:48:28 PM 100 mg/L 5 24900 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 6/12/2013 6:35:00 AM 2 mg/L 1.5 2 25 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: CLS

Chloride 6/12/2013 11:19:00 A M 1000 mg/L 200 13500 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Iron, dissolved 6/12/2013 1:35:20 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 6/12/2013 1:35:20 PM 0.02 mg/L 1 0.10 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 6/11/2013 12:30:34 P M 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Aluminum 6/12/2013 1:32:46 PM 0.1 mg/L 1 < 0.1 0 Arsenic 6/12/2013 1:32:46 PM 0.02 mg/L 1 < 0.02 0 Beryllium 6/12/2013 1:32:46 PM 0.001 mg/L 1 < 0.001 0.8 Boron 6/13/2013 1:19:52 PM 2.50 mg/L 50 277 0 Cadmium 6/12/2013 1:32:46 PM 0.002 mg/L 1 < 0.002 0 Chromium 6/12/2013 1:32:46 PM 0.01 mg/L 1 < 0.01 0 Copper 6/12/2013 1:32:46 PM 0.01 mg/L 1 < 0.01 0.1 Iron 6/12/2013 1:32:46 PM 0.05 mg/L 1 < 0.05 0 Lead 6/12/2013 1:32:46 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 6/12/2013 1:32:46 PM 0.01 mg/L 1 2.42 0 Nickel 6/12/2013 1:32:46 PM 0.01 mg/L 1 < 0.01 0 Selenium 6/12/2013 1:32:46 PM 0.02 mg/L 1 0.10 3.4 Silver 6/12/2013 1:32:46 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 6/12/2013 1:32:46 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 6/13/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 6/12/2013 5:31:00 PM 5 mg/L 1 < 5 15 NOTES: S - Spike recovery indicates a possible matrix effect. The method is in control as indicated by the LCS.

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 M(b) Client Sample ID: FGD Influent

Collection Date: 6/10/2013 9:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1306377
Lab ID: G1306377-002

DF 

# Geochemical Testing Date: 21-Jun-13

Received Date: 6/10/2013 4:42:22 PM 

# Laboratory Results

Sampled By : Water Lab IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 6/11/2013 2:48:28 PM 100 mg/L 5 28400 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 6/11/2013 2:48:49 PM 100 mg/L 20 2900 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 6/12/2013 6:35:00 AM 3 mg/L 3 < 3 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: CLS

Chloride 6/12/2013 11:19:00 A M 1000 mg/L 200 16800 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Iron, dissolved 6/12/2013 1:37:54 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 6/12/2013 1:37:54 PM 0.02 mg/L 1 0.21 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 6/11/2013 12:32:11 P M 0.100 mg/L 500 0.278 0 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Aluminum 6/13/2013 11:50:08 P M 1.0 mg/L 1 101 0 Arsenic 6/13/2013 11:50:08 P M 0.20 mg/L 1 0.58 0 Beryllium 6/13/2013 11:50:08 P M 0.010 mg/L 1 < 0.010 0 Boron 6/18/2013 2:45:18 PM 12.5 mg/L 25 358 0 Cadmium 6/13/2013 11:50:08 P M 0.020 mg/L 1 0.042 0 Chromium 6/13/2013 11:50:08 P M 0.10 mg/L 1 0.70 0 Copper 6/13/2013 11:50:08 P M 0.10 mg/L 1 0.79 0 Iron 6/18/2013 2:47:53 PM 0.50 mg/L 1 295 0 Lead 6/18/2013 2:47:53 PM 0.20 mg/L 1 0.22 0 Manganese 6/13/2013 11:50:08 P M 0.10 mg/L 1 91.6 0 Nickel 6/13/2013 11:50:08 P M 0.10 mg/L 1 1.79 0 Selenium 6/13/2013 11:50:08 P M 0.20 mg/L 1 2.77 0 Silver 6/13/2013 11:50:08 P M 0.050 mg/L 1 < 0.050 0 Zinc 6/13/2013 11:50:08 P M 0.10 mg/L 1 1.69 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 6/17/2013 0.02 mg/L 1 0.70 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 6/12/2013 6:44:00 PM 18 mg/L 3.57 < 18 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Wednesday, July03, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1306A36 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 6/24/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 03-Jul-13 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1306A36 

# CASE NARRATIVE

The BOD and hexavalent chromium were received out of hold time, client approved analysis. No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 6/22/2013 11:15:00 PM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1306A36
Lab ID: G1306A36-001

DF 

# Geochemical Testing Date: 03-Jul-13

Received Date: 6/24/2013 5:46:58 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 6/25/2013 3:56:02 PM 1 mg/L 1 6 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 6/25/2013 3:55:35 PM 100 mg/L 5 25300 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day H 6/26/2013 6:27:00 AM 2 mg/L 1.5 < 2 25 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SAG

Chloride 6/25/2013 10:06:00 A M 1000 mg/L 200 13800 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Iron, dissolved 6/25/2013 4:15:33 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 6/25/2013 4:15:33 PM 0.02 mg/L 1 0.10 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 6/25/2013 12:43:23 P M 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Aluminum 6/25/2013 3:44:37 PM 0.1 mg/L 1 < 0.1 0 Arsenic 6/25/2013 3:44:37 PM 0.02 mg/L 1 < 0.02 0 Beryllium 6/25/2013 3:44:37 PM 0.001 mg/L 1 < 0.001 0.8 Boron 6/26/2013 7:38:00 PM 2.50 mg/L 50 273 0 Cadmium 6/25/2013 3:44:37 PM 0.002 mg/L 1 < 0.002 0 Chromium 6/25/2013 3:44:37 PM 0.01 mg/L 1 < 0.01 0 Copper 6/25/2013 3:44:37 PM 0.01 mg/L 1 < 0.01 0.1 Iron 6/25/2013 3:44:37 PM 0.05 mg/L 1 0.10 0 Lead 6/25/2013 3:44:37 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 6/25/2013 3:44:37 PM 0.01 mg/L 1 0.44 0 Nickel 6/25/2013 3:44:37 PM 0.01 mg/L 1 < 0.01 0 Selenium 6/25/2013 3:44:37 PM 0.02 mg/L 1 0.10 3.4 Silver 6/25/2013 3:44:37 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 6/25/2013 3:44:37 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 7/2/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 6/27/2013 4:27:00 PM 5 mg/L 1 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 6/22/2013 11:00:00 PM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1306A36
Lab ID: G1306A36-002

DF 

# Geochemical Testing Date: 03-Jul-13

Received Date: 6/24/2013 5:46:58 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 6/25/2013 3:55:35 PM 100 mg/L 5 25800 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 6/25/2013 3:56:01 PM 5 mg/L 1 867 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day H 6/26/2013 6:27:00 AM 3 mg/L 3 4 0 

### INORGANIC METALS USGS I-1230-85 Analyst: CLS

Hexavalent Chromium H 6/24/2013 6:33:00 PM 0.020 mg/L 1 < 0.020 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SAG

Chloride 6/25/2013 10:06:00 A M 2500 mg/L 500 19200 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Iron, dissolved 6/25/2013 4:18:08 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 6/25/2013 4:18:08 PM 0.02 mg/L 1 0.43 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 6/25/2013 12:45:00 P M 0.100 mg/L 500 0.780 0 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Aluminum 6/25/2013 5:12:24 PM 1.0 mg/L 1 487 0 Arsenic 6/25/2013 5:12:24 PM 0.20 mg/L 1 2.89 0 Beryllium 6/25/2013 5:12:24 PM 0.010 mg/L 1 0.061 0 Boron 6/26/2013 9:52:00 PM 5.00 mg/L 10 460 0 Cadmium 6/25/2013 5:12:24 PM 0.020 mg/L 1 0.046 0 Chromium 6/25/2013 5:12:24 PM 0.10 mg/L 1 3.15 0 Copper 6/25/2013 5:12:24 PM 0.10 mg/L 1 2.13 0 Iron 6/25/2013 5:12:24 PM 0.50 mg/L 1 1150 0 Lead 6/25/2013 5:12:24 PM 0.20 mg/L 1 0.87 0 Manganese 6/25/2013 5:12:24 PM 0.10 mg/L 1 118 0 Nickel 6/25/2013 5:12:24 PM 0.10 mg/L 1 3.46 0 Selenium 6/25/2013 5:12:24 PM 0.20 mg/L 1 6.56 0 Silver 6/25/2013 5:12:24 PM 0.050 mg/L 1 < 0.050 0 Zinc 6/25/2013 5:12:24 PM 0.10 mg/L 1 5.91 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 7/2/2013 0.02 mg/L 1 3.14 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 6/27/2013 4:27:00 PM 24 mg/L 4.76 < 24 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Tuesday, July09, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1306B79 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 6/26/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 09-Jul-13 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1306B79 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 6/26/2013 12:45:00 PM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1306B79
Lab ID: G1306B79-001

DF 

# Geochemical Testing Date: 09-Jul-13

Received Date: 6/26/2013 6:30:07 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 6/27/2013 2:02:15 PM 1 mg/L 1 5 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 6/27/2013 2:01:52 PM 100 mg/L 5 23800 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 6/27/2013 8:17:00 AM 2 mg/L 1.5 < 2 25 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 6/27/2013 12:52:00 P M 1000 mg/L 200 13700 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Iron, dissolved 6/27/2013 8:37:05 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 6/27/2013 8:37:05 PM 0.02 mg/L 1 0.09 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 6/28/2013 9:06:34 AM 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Aluminum 6/27/2013 8:29:21 PM 0.1 mg/L 1 < 0.1 0 Arsenic 6/27/2013 8:29:21 PM 0.02 mg/L 1 < 0.02 0 Beryllium 6/27/2013 8:29:21 PM 0.001 mg/L 1 < 0.001 0.8 Boron 6/28/2013 12:44:06 P M 2.50 mg/L 50 275 0 Cadmium 6/27/2013 8:29:21 PM 0.002 mg/L 1 < 0.002 0 Chromium 6/27/2013 8:29:21 PM 0.01 mg/L 1 < 0.01 0 Copper 6/27/2013 8:29:21 PM 0.01 mg/L 1 < 0.01 0.1 Iron 6/27/2013 8:29:21 PM 0.05 mg/L 1 < 0.05 0 Lead 6/27/2013 8:29:21 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 6/27/2013 8:29:21 PM 0.01 mg/L 1 0.43 0 Nickel 6/27/2013 8:29:21 PM 0.01 mg/L 1 < 0.01 0 Selenium 6/27/2013 8:29:21 PM 0.02 mg/L 1 0.09 3.4 Silver 6/27/2013 8:29:21 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 6/27/2013 8:29:21 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 7/2/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 7/1/2013 6:57:00 PM 5 mg/L 1 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 6/26/2013 12:30:00 PM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1306B79
Lab ID: G1306B79-002

DF 

# Geochemical Testing Date: 09-Jul-13

Received Date: 6/26/2013 6:30:07 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 6/27/2013 2:01:52 PM 100 mg/L 5 35600 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 6/27/2013 2:02:21 PM 100 mg/L 20 1830 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 6/27/2013 8:17:00 AM 2 mg/L 1.5 2 0 

### INORGANIC METALS USGS I-1230-85 Analyst: MLR

Hexavalent Chromium 6/26/2013 6:56:00 PM 0.020 mg/L 1 < 0.020 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 6/27/2013 12:52:00 P M 2500 mg/L 500 20400 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Iron, dissolved 6/27/2013 8:47:27 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 6/27/2013 8:47:27 PM 0.02 mg/L 1 0.32 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 6/28/2013 9:08:12 AM 0.100 mg/L 500 0.178 0 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Aluminum 7/2/2013 2:27:02 PM 1.0 mg/L 1 82.8 0 Arsenic 7/2/2013 2:27:02 PM 0.20 mg/L 1 0.48 0 Beryllium 7/2/2013 2:27:02 PM 0.010 mg/L 1 < 0.010 0 Boron 7/5/2013 11:42:40 AM 5.00 mg/L 10 449 0 Cadmium 7/2/2013 2:27:02 PM 0.020 mg/L 1 0.052 0 Chromium 7/2/2013 2:27:02 PM 0.10 mg/L 1 0.55 0 Copper 7/2/2013 2:27:02 PM 0.10 mg/L 1 0.64 0 Iron 7/2/2013 2:27:02 PM 0.50 mg/L 1 234 0 Lead 7/2/2013 2:27:02 PM 0.20 mg/L 1 0.20 0 Manganese 7/2/2013 2:27:02 PM 0.10 mg/L 1 109 0 Nickel 7/2/2013 2:27:02 PM 0.10 mg/L 1 1.93 0 Selenium 7/2/2013 2:27:02 PM 0.20 mg/L 1 1.96 0 Silver 7/2/2013 2:27:02 PM 0.050 mg/L 1 < 0.050 0 Zinc 7/2/2013 2:27:02 PM 0.10 mg/L 1 1.60 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 7/8/2013 0.02 mg/L 1 0.55 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 7/1/2013 5:41:00 PM 5 mg/L 1 < 5 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Page 1 of 6 Monday , July15, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Keystone 611 M(a) Order No.: G1307066 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 4 sample(s) on 7/1/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Ti m ot hy W . Ber gst r

esser Di r

ect orofTechni calSer vi ces

# Page 2 of 6 15-Jul-13 Date: 

# Geochemical Testing
Project: Keystone 611 M(a) CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1307066 

# CASE NARRATIVE

REVISED REPORT: BOD value changed for G1307066-001. No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit

# Page 3 of 6 Project: Keystone 611 M(a) Client Sample ID: Outfall 101

Collection Date: 7/1/2013 9:45:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1307066
Lab ID: G1307066-001

DF 

# Geochemical Testing Date: 15-Jul-13

Received Date: 7/1/2013 5:17:28 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 7/2/2013 10:15:04 AM 1 mg/L 1 2 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 7/2/2013 10:14:24 AM 20 mg/L 1 29000 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 7/3/2013 5:52:00 AM 2 mg/L 1.5 < 2 25 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 7/2/2013 12:01:00 PM 1000 mg/L 200 13000 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Iron, dissolved 7/3/2013 4:28:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 7/3/2013 4:28:00 PM 0.02 mg/L 1 0.14 0 

### INORGANIC METALS SM 3112B Analyst: MBG

Mercury 7/2/2013 3:00:40 PM 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Aluminum 7/3/2013 4:24:00 PM 0.1 mg/L 1 < 0.1 0 Arsenic 7/3/2013 4:24:00 PM 0.02 mg/L 1 < 0.02 0 Beryllium 7/3/2013 4:24:00 PM 0.001 mg/L 1 < 0.001 0.8 Boron 7/5/2013 12:46:50 PM 2.50 mg/L 50 271 0 Cadmium 7/3/2013 4:24:00 PM 0.002 mg/L 1 < 0.002 0 Chromium 7/3/2013 4:24:00 PM 0.01 mg/L 1 < 0.01 0 Copper 7/3/2013 4:24:00 PM 0.01 mg/L 1 < 0.01 0.1 Iron 7/3/2013 4:24:00 PM 0.05 mg/L 1 < 0.05 0 Lead 7/3/2013 4:24:00 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 7/3/2013 4:24:00 PM 0.01 mg/L 1 < 0.01 0 Nickel 7/3/2013 4:24:00 PM 0.01 mg/L 1 < 0.01 0 Selenium 7/3/2013 4:24:00 PM 0.02 mg/L 1 0.15 3.4 Silver 7/3/2013 4:24:00 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 7/3/2013 4:24:00 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 7/8/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 7/2/2013 6:51:00 PM 5 mg/L 1.03 < 5 15

I.D. 56-00306 PA DEP

# Page 4 of 6 Project: Keystone 611 M(a) Client Sample ID: FGD Influent

Collection Date: 7/1/2013 9:30:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1307066
Lab ID: G1307066-002

DF 

# Geochemical Testing Date: 15-Jul-13

Received Date: 7/1/2013 5:17:28 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 7/2/2013 10:14:26 AM 100 mg/L 5 33100 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 7/2/2013 10:15:03 AM 100 mg/L 20 14600 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 7/3/2013 5:52:00 AM 3 mg/L 3 18 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 7/2/2013 12:01:00 PM 1000 mg/L 200 17900 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Iron, dissolved 7/3/2013 5:17:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 7/3/2013 5:17:00 PM 0.02 mg/L 1 0.34 0 

### INORGANIC METALS SM 3112B Analyst: MBG

Mercury 7/2/2013 3:02:18 PM 0.100 mg/L 500 0.925 0 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Aluminum 7/9/2013 5:26:58 PM 1.0 mg/L 1 456 0 Arsenic 7/9/2013 5:26:58 PM 0.20 mg/L 1 2.42 0 Beryllium 7/9/2013 5:26:58 PM 0.010 mg/L 1 0.051 0 Boron 7/10/2013 12:54:00 P M 5.00 mg/L 10 424 0 Cadmium 7/9/2013 5:26:58 PM 0.020 mg/L 1 0.031 0 Chromium 7/9/2013 5:26:58 PM 0.10 mg/L 1 2.44 0 Copper 7/9/2013 5:26:58 PM 0.10 mg/L 1 2.14 0 Iron 7/9/2013 5:26:58 PM 0.50 mg/L 1 1010 0 Lead 7/9/2013 5:26:58 PM 0.20 mg/L 1 0.83 0 Manganese 7/9/2013 5:26:58 PM 0.10 mg/L 1 105 0 Nickel 7/9/2013 5:26:58 PM 0.10 mg/L 1 3.08 0 Selenium 7/9/2013 5:26:58 PM 0.20 mg/L 1 6.28 0 Silver 7/9/2013 5:26:58 PM 0.050 mg/L 1 < 0.050 0 Zinc 7/9/2013 5:26:58 PM 0.10 mg/L 1 5.11 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 7/10/2013 0.02 mg/L 1 2.44 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 7/2/2013 6:51:00 PM 18 mg/L 3.57 < 18 0

I.D. 56-00306 PA DEP

# Page 5 of 6 Project: Keystone 611 M(a) Client Sample ID: Plum Creek

Collection Date: 7/1/2013 10:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1307066
Lab ID: G1307066-003

DF 

# Geochemical Testing Date: 15-Jul-13

Received Date: 7/1/2013 5:17:28 PM 

# Laboratory Results

Sampled By : Client

MCL
INORGANIC NON METALS SM 4500-CO2D Analyst: MBG

Bicarbonate 7/2/2013 6:12:00 PM 5 mg/L CaCO3 1 55 0 

### INORGANIC NON-METALS SM 4500-CO2 Analyst: MBG

Carbonate 7/2/2013 6:12:00 PM 5 mg/L CaCO3 1 < 5 0 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 7/2/2013 10:14:24 AM 20 mg/L 1 164 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 7/2/2013 10:15:02 AM 5 mg/L 1 24 0 

### INORGANIC NON-METALS ASTM D1067-06 Analyst: MBG

Alkalinity to pH 4.5 7/2/2013 6:12:00 PM 5 mg/L CaCO3 1 55 0 

### INORGANIC NON-METALS EPA 300.0 Analyst: MLR

Nitrate Nitrogen 7/2/2013 12:24:00 AM 0.05 mg/L as N 1 1.21 0 Nitrite Nitrogen 7/2/2013 12:24:00 AM 0.05 mg/L as N 1 < 0.05 0 Nitrate - Nitrite 7/2/2013 12:24:00 AM 0.05 mg/L as N 1 1.21 0 

### INORGANIC NON-METALS EPA 300.0 Analyst: MLR

Chloride 7/2/2013 12:24:00 AM 1 mg/L 1 6 0 Fluoride 7/2/2013 12:24:00 AM 0.1 mg/L 1 < 0.1 0 Sulfate 7/2/2013 12:24:00 AM 2 mg/L 1 24 0 

### INORGANIC NON-METALS EPA 350.1 Analyst: SLY

Ammonia Nitrogen - Distilled 7/3/2013 10:43:11 AM 0.10 mg/L as N 1 0.13 0 

### INORGANICS NON METALS SM 4500-SIO2 C Analyst: MLR

Silica, total 7/2/2013 4:48:00 PM 0.20 mg/L 1 6.7 0 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Barium 7/5/2013 1:56:19 PM 0.01 mg/L 1 0.04 0 Boron 7/5/2013 1:56:19 PM 0.05 mg/L 1 < 0.05 0 Calcium 7/5/2013 1:56:19 PM 0.1 mg/L 1 15.9 0 Iron 7/5/2013 1:56:19 PM 0.05 mg/L 1 1.39 0 Magnesium 7/5/2013 1:56:19 PM 0.1 mg/L 1 4.6 0 Manganese 7/5/2013 1:56:19 PM 0.01 mg/L 1 0.12 0 Potassium 7/5/2013 1:56:19 PM 0.5 mg/L 1 1.7 0 Sodium 7/5/2013 1:56:19 PM 0.2 mg/L 1 7.4 0 Strontium 7/5/2013 1:56:19 PM 0.01 mg/L 1 0.09 0 

### INDICATOR ORGANIC PARAMETERS SM 20 5310-C Analyst: MTM

Total Organic Carbon 7/4/2013 5:27:00 AM 0.5 mg/L 1 2.4 0

I.D. 56-00306 PA DEP

# Page 6 of 6 Project: Keystone 611 M(a) Client Sample ID: Crooked Creek

Collection Date: 7/1/2013 8:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1307066
Lab ID: G1307066-004

DF 

# Geochemical Testing Date: 15-Jul-13

Received Date: 7/1/2013 5:17:28 PM 

# Laboratory Results

Sampled By : Client

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 7/2/2013 10:14:23 AM 20 mg/L 1 110 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 7/2/2013 10:15:02 AM 5 mg/L 1 58 

### INORGANIC NON-METALS ASTM D1067-06 Analyst: MBG

Alkalinity to pH 4.5 7/2/2013 11:21:00 PM 5 mg/L CaCO3 1 37 0 

### INORGANIC NON-METALS EPA 300.0 Analyst: MLR

Nitrate Nitrogen 7/2/2013 1:15:00 AM 0.05 mg/L as N 1 1.19 0 Nitrite Nitrogen 7/2/2013 1:15:00 AM 0.05 mg/L as N 1 < 0.05 0 Nitrate - Nitrite 7/2/2013 1:15:00 AM 0.05 mg/L as N 1 1.19 0 

### INORGANIC NON-METALS EPA 300.0 Analyst: MLR

Chloride 7/2/2013 1:15:00 AM 1 mg/L 1 10 0 Sulfate 7/2/2013 1:15:00 AM 2 mg/L 1 30 0 

### INORGANICS NON METALS SM 4500-SIO2 C Analyst: MLR

Silica, total 7/2/2013 4:48:00 PM 0.20 mg/L 1 6.9 0 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Calcium 7/5/2013 1:58:51 PM 0.1 mg/L 1 18.4 0 Iron 7/5/2013 1:58:51 PM 0.05 mg/L 1 6.29 0 Magnesium 7/5/2013 1:58:51 PM 0.1 mg/L 1 5.3 0 Manganese 7/5/2013 1:58:51 PM 0.01 mg/L 1 0.67 0 Potassium 7/5/2013 1:58:51 PM 0.5 mg/L 1 2.1 0 Sodium 7/5/2013 1:58:51 PM 0.2 mg/L 1 10.0 0 

### INDICATOR ORGANIC PARAMETERS SM 20 5310-C Analyst: MTM

Total Organic Carbon 7/4/2013 5:45:00 AM 0.5 mg/L 1 2.6 0

I.D. 56-00306 PA DEP

# Wednesday, July17, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 Q(a) Order No.: G1307318 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 7/8/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 17-Jul-13 Date: 

# Geochemical Testing
Project: Keystone 611 Q(a) CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1307318 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 Q(a) Client Sample ID: Outfall 101

Collection Date: 7/8/2013 9:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1307318
Lab ID: G1307318-001

DF 

# Geochemical Testing Date: 17-Jul-13

Received Date: 7/8/2013 5:03:04 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 7/9/2013 3:12:09 PM 1 mg/L 1 1 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 7/9/2013 3:11:44 PM 20 mg/L 1 27400 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 7/10/2013 6:02:00 AM 6 mg/L 6 6 25 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: CLS

Chloride 7/9/2013 11:16:00 AM 1000 mg/L 200 16000 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Iron, dissolved 7/9/2013 6:58:40 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 7/9/2013 6:58:40 PM 0.02 mg/L 1 0.10 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 7/10/2013 10:08:17 A M 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Aluminum 7/9/2013 7:34:15 PM 0.1 mg/L 1 < 0.1 0 Arsenic 7/9/2013 7:34:15 PM 0.02 mg/L 1 < 0.02 0 Beryllium 7/9/2013 7:34:15 PM 0.001 mg/L 1 < 0.001 0.8 Boron 7/10/2013 1:16:00 PM 2.50 mg/L 50 254 0 Cadmium 7/9/2013 7:34:15 PM 0.002 mg/L 1 < 0.002 0 Chromium 7/9/2013 7:34:15 PM 0.01 mg/L 1 < 0.01 0 Copper 7/9/2013 7:34:15 PM 0.01 mg/L 1 < 0.01 0.1 Iron 7/9/2013 7:34:15 PM 0.05 mg/L 1 < 0.05 0 Lead 7/9/2013 7:34:15 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 7/9/2013 7:34:15 PM 0.01 mg/L 1 0.02 0 Nickel 7/9/2013 7:34:15 PM 0.01 mg/L 1 < 0.01 0 Selenium 7/9/2013 7:34:15 PM 0.02 mg/L 1 0.09 3.4 Silver 7/9/2013 7:34:15 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 7/9/2013 7:34:15 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 7/16/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease S 7/10/2013 5:01:00 PM 5 mg/L 1 < 5 15 NOTES: S - Spike recovery indicates a possible matrix effect. The method is in control as indicated by the LCS.

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 Q(a) Client Sample ID: FGD Influent

Collection Date: 7/8/2013 8:45:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1307318
Lab ID: G1307318-002

DF 

# Geochemical Testing Date: 17-Jul-13

Received Date: 7/8/2013 5:03:04 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 7/9/2013 3:11:44 PM 100 mg/L 5 33300 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 7/9/2013 3:12:13 PM 100 mg/L 20 8450 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 7/10/2013 6:02:00 AM 3 mg/L 3 4 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: CLS

Chloride 7/9/2013 11:16:00 AM 1000 mg/L 200 17500 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Iron, dissolved 7/9/2013 7:01:14 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 7/9/2013 7:01:14 PM 0.02 mg/L 1 0.18 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 7/10/2013 10:13:14 A M 0.100 mg/L 500 0.770 0 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Aluminum 7/9/2013 5:32:07 PM 1.0 mg/L 1 305 0 Arsenic 7/9/2013 5:32:07 PM 0.20 mg/L 1 1.58 0 Beryllium 7/9/2013 5:32:07 PM 0.010 mg/L 1 0.031 0 Boron 7/10/2013 12:57:00 P M 5.00 mg/L 10 396 0 Cadmium 7/9/2013 5:32:07 PM 0.020 mg/L 1 0.033 0 Chromium 7/9/2013 5:32:07 PM 0.10 mg/L 1 1.60 0 Copper 7/9/2013 5:32:07 PM 0.10 mg/L 1 1.50 0 Iron 7/9/2013 5:32:07 PM 0.50 mg/L 1 685 0 Lead 7/9/2013 5:32:07 PM 0.20 mg/L 1 0.51 0 Manganese 7/9/2013 5:32:07 PM 0.10 mg/L 1 97.5 0 Nickel 7/9/2013 5:32:07 PM 0.10 mg/L 1 2.53 0 Selenium 7/9/2013 5:32:07 PM 0.20 mg/L 1 5.24 0 Silver 7/9/2013 5:32:07 PM 0.050 mg/L 1 < 0.050 0 Zinc 7/9/2013 5:32:07 PM 0.10 mg/L 1 3.83 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 7/16/2013 0.02 mg/L 1 1.60 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 7/10/2013 5:01:00 PM 23 mg/L 4.55 < 23 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Wednesday, July24, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1307664 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 7/15/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 24-Jul-13 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1307664 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 7/15/2013 9:30:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1307664
Lab ID: G1307664-001

DF 

# Geochemical Testing Date: 24-Jul-13

Received Date: 7/15/2013 5:32:03 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 7/16/2013 2:08:31 PM 1 mg/L 1 < 1 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 7/16/2013 2:07:48 PM 20 mg/L 1 26200 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 7/17/2013 5:40:00 AM 2 mg/L 1.5 < 2 25 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: CLS

Chloride 7/16/2013 1:44:00 PM 1000 mg/L 200 16500 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Iron, dissolved 7/18/2013 8:27:51 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 7/18/2013 8:27:51 PM 0.02 mg/L 1 0.10 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 7/18/2013 8:21:58 AM 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Aluminum 7/18/2013 8:25:15 PM 0.1 mg/L 1 < 0.1 0 Arsenic 7/18/2013 8:25:15 PM 0.02 mg/L 1 < 0.02 0 Beryllium 7/18/2013 8:25:15 PM 0.001 mg/L 1 < 0.001 0.8 Boron 7/19/2013 5:19:13 PM 2.50 mg/L 50 261 0 Cadmium 7/18/2013 8:25:15 PM 0.002 mg/L 1 < 0.002 0 Chromium 7/18/2013 8:25:15 PM 0.01 mg/L 1 < 0.01 0 Copper 7/18/2013 8:25:15 PM 0.01 mg/L 1 < 0.01 0.1 Iron 7/18/2013 8:25:15 PM 0.05 mg/L 1 < 0.05 0 Lead 7/23/2013 2:53:00 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 7/18/2013 8:25:15 PM 0.01 mg/L 1 0.11 0 Nickel 7/18/2013 8:25:15 PM 0.01 mg/L 1 < 0.01 0 Selenium 7/18/2013 8:25:15 PM 0.02 mg/L 1 0.11 3.4 Silver 7/18/2013 8:25:15 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 7/18/2013 8:25:15 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 7/23/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 7/18/2013 1:49:00 PM 5 mg/L 1.02 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 7/15/2013 9:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1307664
Lab ID: G1307664-002

DF 

# Geochemical Testing Date: 24-Jul-13

Received Date: 7/15/2013 5:32:03 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 7/16/2013 2:07:48 PM 100 mg/L 5 32300 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 7/16/2013 2:08:31 PM 100 mg/L 20 9950 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 7/17/2013 5:40:00 AM 3 mg/L 3 < 3 0 

### INORGANIC METALS USGS I-1230-85 Analyst: SEF

Hexavalent Chromium 7/15/2013 6:32:00 PM 0.020 mg/L 1 < 0.020 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: CLS

Chloride 7/16/2013 1:44:00 PM 1000 mg/L 200 19000 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Iron, dissolved 7/18/2013 8:38:16 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 7/18/2013 8:38:16 PM 0.02 mg/L 1 0.32 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 7/18/2013 8:23:35 AM 0.100 mg/L 500 0.790 0 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Aluminum 7/18/2013 1:12:55 PM 1.0 mg/L 1 264 0 Arsenic 7/18/2013 1:12:55 PM 0.20 mg/L 1 1.99 0 Beryllium 7/18/2013 1:12:55 PM 0.010 mg/L 1 0.030 0 Boron 7/19/2013 1:27:08 PM 5.00 mg/L 10 403 0 Cadmium 7/18/2013 1:12:55 PM 0.020 mg/L 1 < 0.020 0 Chromium 7/18/2013 1:12:55 PM 0.10 mg/L 1 1.87 0 Copper 7/18/2013 1:12:55 PM 0.10 mg/L 1 1.73 0 Iron 7/19/2013 5:01:03 PM 0.50 mg/L 1 607 0 Lead 7/18/2013 1:12:55 PM 0.20 mg/L 1 0.61 0 Manganese 7/18/2013 1:12:55 PM 0.10 mg/L 1 94.5 0 Nickel 7/18/2013 1:12:55 PM 0.10 mg/L 1 2.55 0 Selenium 7/19/2013 5:01:03 PM 0.20 mg/L 1 5.45 0 Silver 7/18/2013 1:12:55 PM 0.050 mg/L 1 < 0.050 0 Zinc 7/18/2013 1:12:55 PM 0.10 mg/L 1 3.92 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 7/23/2013 0.02 mg/L 1 1.87 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 7/18/2013 1:52:00 PM 24 mg/L 4.76 < 24 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Friday, August 02, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1307A03 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 7/22/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 02-Aug-13 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1307A03 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 7/22/2013 9:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1307A03
Lab ID: G1307A03-001

DF 

# Geochemical Testing Date: 02-Aug-13

Received Date: 7/22/2013 6:17:37 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 7/23/2013 2:51:20 PM 1 mg/L 1 7 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 7/23/2013 8:16:43 AM 20 mg/L 1 27200 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 7/24/2013 6:18:00 AM 2 mg/L 1.5 < 2 25 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: CLS

Chloride 7/23/2013 10:10:00 A M 1000 mg/L 200 16500 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Iron, dissolved 7/25/2013 4:09:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 7/25/2013 4:09:00 PM 0.02 mg/L 1 0.14 0 

### INORGANIC METALS SM 3112B Analyst: MBG

Mercury 7/25/2013 10:54:31 A M 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Aluminum 7/25/2013 4:05:00 PM 0.1 mg/L 1 < 0.1 0 Arsenic 7/25/2013 4:05:00 PM 0.02 mg/L 1 < 0.02 0 Beryllium 7/25/2013 4:05:00 PM 0.001 mg/L 1 < 0.001 0.8 Boron 7/26/2013 5:40:53 PM 2.50 mg/L 50 279 0 Cadmium 7/25/2013 4:05:00 PM 0.002 mg/L 1 < 0.002 0 Chromium 7/25/2013 4:05:00 PM 0.01 mg/L 1 0.01 0 Copper 7/25/2013 4:05:00 PM 0.01 mg/L 1 < 0.01 0.1 Iron 7/25/2013 4:05:00 PM 0.05 mg/L 1 < 0.05 0 Lead 7/25/2013 4:05:00 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 7/25/2013 4:05:00 PM 0.01 mg/L 1 < 0.01 0 Nickel 7/25/2013 4:05:00 PM 0.01 mg/L 1 0.01 0 Selenium 7/25/2013 4:05:00 PM 0.02 mg/L 1 0.13 3.4 Silver 7/25/2013 4:05:00 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 7/25/2013 4:05:00 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 7/29/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 7/23/2013 2:54:00 PM 5 mg/L 1 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 7/22/2013 9:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1307A03
Lab ID: G1307A03-002

DF 

# Geochemical Testing Date: 02-Aug-13

Received Date: 7/22/2013 6:17:37 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 7/23/2013 2:50:45 PM 100 mg/L 5 35100 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 7/23/2013 2:51:19 PM 100 mg/L 20 2210 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 7/24/2013 6:18:00 AM 2 mg/L 1.5 < 2 0 

### INORGANIC METALS USGS I-1230-85 Analyst: MLR

Hexavalent Chromium 7/22/2013 6:59:00 PM 0.020 mg/L 1 < 0.020 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: CLS

Chloride 7/23/2013 10:10:00 A M 1000 mg/L 200 18200 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Iron, dissolved 7/25/2013 4:20:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 7/25/2013 4:20:00 PM 0.02 mg/L 1 0.42 0 

### INORGANIC METALS SM 3112B Analyst: MBG

Mercury 7/25/2013 11:18:57 A M 0.100 mg/L 500 0.310 0 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Aluminum 7/31/2013 11:42:00 P M 1.0 mg/L 1 94.3 0 Arsenic 7/31/2013 12:03:00 A M 0.20 mg/L 1 0.79 0 Beryllium 7/31/2013 12:03:00 A M 0.010 mg/L 1 0.015 0 Boron 7/30/2013 1:16:18 PM 5.00 mg/L 10 415 0 Cadmium 7/31/2013 12:03:00 A M 0.020 mg/L 1 0.029 0 Chromium 7/31/2013 12:03:00 A M 0.10 mg/L 1 1.37 0 Copper 7/31/2013 12:03:00 A M 0.10 mg/L 1 0.69 0 Iron 7/31/2013 12:03:00 A M 0.50 mg/L 1 254 0 Lead 7/31/2013 12:03:00 A M 0.20 mg/L 1 0.26 0 Manganese 7/31/2013 12:03:00 A M 0.10 mg/L 1 83.5 0 Nickel 7/31/2013 12:03:00 A M 0.10 mg/L 1 5.30 0 Selenium 7/31/2013 12:03:00 A M 0.20 mg/L 1 2.74 0 Silver 7/31/2013 12:03:00 A M 0.050 mg/L 1 < 0.050 0 Zinc 7/31/2013 12:03:00 A M 0.10 mg/L 1 2.38 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: SUB

Trivalent Chromium 7/31/2013 0.02 mg/L 1 1.37 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 7/23/2013 2:56:00 PM 18 mg/L 3.57 < 18 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Tuesday, August 06, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1307C92 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 7/29/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 06-Aug-13 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1307C92 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 7/29/2013 10:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1307C92
Lab ID: G1307C92-001

DF 

# Geochemical Testing Date: 06-Aug-13

Received Date: 7/29/2013 5:58:58 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 7/30/2013 2:56:22 PM 1 mg/L 1 8 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 7/30/2013 3:01:45 PM 20 mg/L 1 25400 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 7/31/2013 6:15:00 AM 2 mg/L 1.5 < 2 25 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: CLS

Chloride 7/31/2013 10:36:00 A M 1000 mg/L 200 15700 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Iron, dissolved 8/1/2013 12:55:00 AM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 8/1/2013 12:55:00 AM 0.02 mg/L 1 0.13 0 

### INORGANIC METALS SM 3112B Analyst: MBG

Mercury 7/31/2013 1:34:06 PM 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Aluminum 8/1/2013 12:51:00 AM 0.1 mg/L 1 < 0.1 0 Arsenic 8/1/2013 8:24:10 PM 0.02 mg/L 1 < 0.02 0 Beryllium 8/1/2013 12:51:00 AM 0.001 mg/L 1 < 0.001 0.8 Boron 8/1/2013 1:12:42 PM 5.00 mg/L 100 305 0 Cadmium 8/1/2013 8:24:10 PM 0.002 mg/L 1 < 0.002 0 Chromium 8/1/2013 12:51:00 AM 0.01 mg/L 1 0.01 0 Copper 8/1/2013 12:51:00 AM 0.01 mg/L 1 < 0.01 0.1 Iron 8/1/2013 12:51:00 AM 0.05 mg/L 1 < 0.05 0 Lead 8/1/2013 8:24:10 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 8/1/2013 12:51:00 AM 0.01 mg/L 1 0.21 0 Nickel 8/1/2013 12:51:00 AM 0.01 mg/L 1 0.01 0 Selenium 8/1/2013 12:51:00 AM 0.02 mg/L 1 0.14 3.4 Silver 8/1/2013 12:51:00 AM 0.005 mg/L 1 < 0.005 0.1 Zinc 8/1/2013 12:51:00 AM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 8/1/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 7/31/2013 4:17:00 PM 5 mg/L 1.02 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 7/29/2013 10:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1307C92
Lab ID: G1307C92-002

DF 

# Geochemical Testing Date: 06-Aug-13

Received Date: 7/29/2013 5:58:58 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 7/30/2013 3:01:45 PM 100 mg/L 5 27500 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 7/30/2013 2:56:23 PM 100 mg/L 20 10000 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 7/31/2013 6:15:00 AM 3 mg/L 3 4 0 

### INORGANIC METALS USGS I-1230-85 Analyst: SAG

Hexavalent Chromium 7/29/2013 6:42:00 PM 0.020 mg/L 1 < 0.020 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: CLS

Chloride 7/31/2013 10:36:00 A M 1000 mg/L 200 19000 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Iron, dissolved 8/1/2013 1:03:00 AM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 8/1/2013 1:03:00 AM 0.02 mg/L 1 0.29 0 

### INORGANIC METALS SM 3112B Analyst: MBG

Mercury 7/31/2013 1:35:43 PM 0.100 mg/L 500 0.850 0 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Aluminum 7/31/2013 10:51:00 P M 1.0 mg/L 1 257 0 Arsenic 8/1/2013 3:01:27 PM 0.20 mg/L 1 1.84 0 Beryllium 7/31/2013 10:51:00 P M 0.010 mg/L 1 0.027 0 Boron 8/1/2013 1:15:16 PM 5.00 mg/L 10 458 0 Cadmium 8/1/2013 3:01:27 PM 0.020 mg/L 1 0.044 0 Chromium 7/31/2013 10:51:00 P M 0.10 mg/L 1 1.77 0 Copper 7/31/2013 10:51:00 P M 0.10 mg/L 1 1.29 0 Iron 7/31/2013 10:51:00 P M 0.50 mg/L 1 652 0 Lead 7/31/2013 10:51:00 P M 0.20 mg/L 1 0.52 0 Manganese 7/31/2013 10:51:00 P M 0.10 mg/L 1 94.5 0 Nickel 7/31/2013 10:51:00 P M 0.10 mg/L 1 2.68 0 Selenium 7/31/2013 10:51:00 P M 0.20 mg/L 1 4.63 0 Silver 7/31/2013 10:51:00 P M 0.050 mg/L 1 < 0.050 0 Zinc 7/31/2013 10:51:00 P M 0.10 mg/L 1 3.41 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 8/1/2013 0.02 mg/L 1 1.77 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 7/31/2013 4:17:00 PM 18 mg/L 3.57 < 18 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Wednesday, August 14, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 M(a) Order No.: G1308183 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 8/5/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 14-Aug-13 Date: 

# Geochemical Testing
Project: Keystone 611 M(a) CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1308183 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 M(a) Client Sample ID: Outfall 101

Collection Date: 8/5/2013 9:30:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1308183
Lab ID: G1308183-001

DF 

# Geochemical Testing Date: 14-Aug-13

Received Date: 8/5/2013 5:57:14 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: GMG

Total suspended solids 8/6/2013 4:00:06 PM 1 mg/L 1 < 1 10 

### INORGANIC NON-METALS SM 2540 C Analyst: GMG

Total dissolved solids 8/6/2013 4:00:33 PM 20 mg/L 1 31700 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 8/7/2013 6:30:00 AM 2 mg/L 1.5 < 2 25 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 8/6/2013 12:28:00 PM 1000 mg/L 200 9980 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Iron, dissolved 8/7/2013 1:45:41 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 8/7/2013 1:45:41 PM 0.02 mg/L 1 0.10 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 8/8/2013 10:25:16 AM 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Aluminum 8/7/2013 1:43:07 PM 0.1 mg/L 1 < 0.1 0 Arsenic 8/7/2013 1:43:07 PM 0.02 mg/L 1 < 0.02 0 Beryllium 8/7/2013 1:43:07 PM 0.001 mg/L 1 < 0.001 0.8 Boron 8/8/2013 12:56:02 PM 2.50 mg/L 50 344 0 Cadmium 8/7/2013 1:43:07 PM 0.002 mg/L 1 < 0.002 0 Chromium 8/7/2013 1:43:07 PM 0.01 mg/L 1 < 0.01 0 Copper 8/7/2013 1:43:07 PM 0.01 mg/L 1 0.01 0.1 Iron 8/7/2013 1:43:07 PM 0.05 mg/L 1 < 0.05 0 Lead 8/7/2013 1:43:07 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 8/7/2013 1:43:07 PM 0.01 mg/L 1 0.14 0 Nickel 8/7/2013 1:43:07 PM 0.01 mg/L 1 < 0.01 0 Selenium 8/7/2013 1:43:07 PM 0.02 mg/L 1 0.10 3.4 Silver 8/7/2013 1:43:07 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 8/7/2013 1:43:07 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 8/8/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 8/6/2013 6:42:00 PM 5 mg/L 1 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 M(a) Client Sample ID: FGD Influent

Collection Date: 8/5/2013 9:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1308183
Lab ID: G1308183-002

DF 

# Geochemical Testing Date: 14-Aug-13

Received Date: 8/5/2013 5:57:14 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: GMG

Total dissolved solids 8/6/2013 4:00:34 PM 100 mg/L 5 37600 0 

### PHYSICAL TESTS SM 2540D Analyst: GMG

Total suspended solids 8/6/2013 4:00:04 PM 5 mg/L 1 44 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 8/7/2013 6:30:00 AM 2 mg/L 1.5 3 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 8/6/2013 12:28:00 PM 1000 mg/L 200 16200 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Iron, dissolved 8/7/2013 1:55:58 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 8/7/2013 1:55:58 PM 0.02 mg/L 1 0.31 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 8/8/2013 10:26:55 AM 0.100 mg/L 500 < 0.100 0 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Aluminum 8/8/2013 7:49:00 PM 1.0 mg/L 1 23.6 0 Arsenic 8/8/2013 7:49:00 PM 0.20 mg/L 1 0.20 0 Beryllium 8/8/2013 7:49:00 PM 0.010 mg/L 1 < 0.010 0 Boron 8/12/2013 1:28:39 PM 5.00 mg/L 10 439 0 Cadmium 8/8/2013 7:49:00 PM 0.020 mg/L 1 0.025 0 Chromium 8/8/2013 7:49:00 PM 0.10 mg/L 1 0.19 0 Copper 8/8/2013 7:49:00 PM 0.10 mg/L 1 0.13 0 Iron 8/8/2013 7:49:00 PM 0.50 mg/L 1 71.8 0 Lead 8/8/2013 7:49:00 PM 0.20 mg/L 1 < 0.20 0 Manganese 8/8/2013 7:49:00 PM 0.10 mg/L 1 84.4 0 Nickel 8/8/2013 7:49:00 PM 0.10 mg/L 1 1.49 0 Selenium 8/8/2013 7:49:00 PM 0.20 mg/L 1 1.09 0 Silver 8/8/2013 7:49:00 PM 0.050 mg/L 1 < 0.050 0 Zinc 8/8/2013 7:49:00 PM 0.10 mg/L 1 0.83 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 8/12/2013 0.02 mg/L 1 0.19 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 8/7/2013 4:58:00 PM 18 mg/L 3.57 24 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Friday, August 23, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 M(b) Order No.: G1308545 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 8/12/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 23-Aug-13 Date: 

# Geochemical Testing
Project: Keystone 611 M(b) CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1308545 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 M(b) Client Sample ID: Outfall 101

Collection Date: 8/12/2013 9:30:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1308545
Lab ID: G1308545-001

DF 

# Geochemical Testing Date: 23-Aug-13

Received Date: 8/12/2013 4:34:27 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 8/13/2013 2:08:00 PM 1 mg/L 1 < 1 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 8/13/2013 2:08:31 PM 20 mg/L 1 26700 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 8/14/2013 5:44:00 AM 2 mg/L 1.5 < 2 25 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: CLS

Chloride 8/14/2013 9:22:00 AM 1000 mg/L 200 15300 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Iron, dissolved 8/14/2013 10:59:00 P M 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 8/14/2013 10:59:00 P M 0.02 mg/L 1 0.13 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 8/14/2013 10:53:15 A M 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Aluminum 8/14/2013 10:43:00 P M 0.1 mg/L 1 < 0.1 0 Arsenic 8/14/2013 10:43:00 P M 0.02 mg/L 1 0.02 0 Beryllium 8/14/2013 10:43:00 P M 0.001 mg/L 1 < 0.001 0.8 Boron 8/15/2013 1:55:30 PM 2.50 mg/L 50 324 0 Cadmium 8/14/2013 10:43:00 P M 0.002 mg/L 1 < 0.002 0 Chromium 8/14/2013 10:43:00 P M 0.01 mg/L 1 0.01 0 Copper 8/14/2013 10:43:00 P M 0.01 mg/L 1 < 0.01 0.1 Iron 8/14/2013 10:43:00 P M 0.05 mg/L 1 < 0.05 0 Lead 8/14/2013 10:43:00 P M 0.02 mg/L 1 < 0.02 0.1 Manganese 8/14/2013 10:43:00 P M 0.01 mg/L 1 0.03 0 Nickel 8/14/2013 10:43:00 P M 0.01 mg/L 1 0.01 0 Selenium 8/14/2013 10:43:00 P M 0.02 mg/L 1 0.13 3.4 Silver 8/14/2013 10:43:00 P M 0.005 mg/L 1 < 0.005 0.1 Zinc 8/14/2013 10:43:00 P M 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 8/19/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 8/14/2013 3:40:00 PM 5 mg/L 1.03 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 M(b) Client Sample ID: FGD Influent

Collection Date: 8/12/2013 9:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1308545
Lab ID: G1308545-002

DF 

# Geochemical Testing Date: 23-Aug-13

Received Date: 8/12/2013 4:34:27 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 8/13/2013 2:08:31 PM 100 mg/L 5 27000 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 8/13/2013 2:08:01 PM 100 mg/L 20 8680 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 8/14/2013 5:44:00 AM 3 mg/L 3 5 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: CLS

Chloride 8/14/2013 9:22:00 AM 1000 mg/L 200 17300 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Iron, dissolved 8/14/2013 11:04:00 P M 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 8/14/2013 11:04:00 P M 0.02 mg/L 1 0.38 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 8/14/2013 10:58:08 A M 0.100 mg/L 500 0.625 0 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Aluminum 8/19/2013 4:06:45 PM 1.0 mg/L 1 261 0 Arsenic 8/19/2013 4:06:45 PM 0.20 mg/L 1 1.82 0 Beryllium 8/19/2013 4:06:45 PM 0.010 mg/L 1 0.029 0 Boron 8/20/2013 3:55:52 PM 5.00 mg/L 10 491 0 Cadmium 8/19/2013 4:06:45 PM 0.020 mg/L 1 0.049 0 Chromium 8/19/2013 4:06:45 PM 0.10 mg/L 1 1.81 0 Copper 8/19/2013 4:06:45 PM 0.10 mg/L 1 1.42 0 Iron 8/19/2013 4:06:45 PM 0.50 mg/L 1 638 0 Lead 8/19/2013 4:06:45 PM 0.20 mg/L 1 0.67 0 Manganese 8/19/2013 4:06:45 PM 0.10 mg/L 1 99.6 0 Nickel 8/19/2013 4:06:45 PM 0.10 mg/L 1 2.72 0 Selenium 8/19/2013 4:06:45 PM 0.20 mg/L 1 4.76 0 Silver 8/19/2013 4:06:45 PM 0.050 mg/L 1 < 0.050 0 Zinc 8/19/2013 4:06:45 PM 0.10 mg/L 1 4.20 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 8/21/2013 0.02 mg/L 1 1.81 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 8/14/2013 3:43:00 PM 20 mg/L 4 < 20 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Friday, August 30, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1308926 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 8/19/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 30-Aug-13 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1308926 

# CASE NARRATIVE

G1308926-001F: The original TDS analysis did not pass QA review and was reanalyzed two days out of hold time. No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 8/19/2013 9:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1308926
Lab ID: G1308926-001

DF 

# Geochemical Testing Date: 30-Aug-13

Received Date: 8/19/2013 5:24:31 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 8/20/2013 2:52:41 PM 1 mg/L 1 6 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids H 8/28/2013 11:44:10 A M 100 mg/L 5 32200 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 8/21/2013 5:38:00 AM 2 mg/L 1.5 < 2 25 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: CLS

Chloride 8/23/2013 12:53:00 P M 1000 mg/L 200 14800 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Iron, dissolved 8/23/2013 12:32:00 P M 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 8/23/2013 12:32:00 P M 0.02 mg/L 1 0.20 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 8/22/2013 10:29:04 A M 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Aluminum 8/23/2013 12:28:00 P M 0.1 mg/L 1 < 0.1 0 Arsenic 8/23/2013 12:28:00 P M 0.02 mg/L 1 < 0.02 0 Beryllium 8/23/2013 12:28:00 P M 0.001 mg/L 1 < 0.001 0.8 Boron 8/27/2013 12:46:05 P M 2.50 mg/L 50 292 0 Cadmium 8/23/2013 12:28:00 P M 0.002 mg/L 1 < 0.002 0 Chromium 8/23/2013 12:28:00 P M 0.01 mg/L 1 0.01 0 Copper 8/23/2013 12:28:00 P M 0.01 mg/L 1 < 0.01 0.1 Iron 8/23/2013 12:28:00 P M 0.05 mg/L 1 < 0.05 0 Lead 8/23/2013 12:28:00 P M 0.02 mg/L 1 < 0.02 0.1 Manganese 8/23/2013 12:28:00 P M 0.01 mg/L 1 0.08 0 Nickel 8/23/2013 12:28:00 P M 0.01 mg/L 1 0.01 0 Selenium 8/23/2013 12:28:00 P M 0.02 mg/L 1 0.20 3.4 Silver 8/23/2013 12:28:00 P M 0.005 mg/L 1 < 0.005 0.1 Zinc 8/23/2013 12:28:00 P M 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 8/27/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 8/20/2013 6:27:00 PM 5 mg/L 1 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 8/19/2013 9:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1308926
Lab ID: G1308926-002

DF 

# Geochemical Testing Date: 30-Aug-13

Received Date: 8/19/2013 5:24:31 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 8/20/2013 2:52:04 PM 100 mg/L 5 34800 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 8/20/2013 2:52:33 PM 100 mg/L 20 2830 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day J 8/21/2013 5:38:00 AM 2 mg/L 1.5 4 0 NOTES: J - Estimated value. The associated QC criteria was above the Upper Control Limit. 

### INORGANIC METALS USGS I-1230-85 Analyst: SEF

Hexavalent Chromium 8/19/2013 6:33:00 PM 0.020 mg/L 1 < 0.020 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: CLS

Chloride 8/23/2013 12:53:00 P M 1000 mg/L 200 14600 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Iron, dissolved 8/23/2013 12:37:00 P M 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 8/23/2013 12:37:00 P M 0.02 mg/L 1 1.83 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 8/22/2013 2:37:57 PM 0.100 mg/L 500 0.153 0 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Aluminum 8/22/2013 11:16:21 P M 1.0 mg/L 1 70.7 0 Arsenic 8/22/2013 11:16:21 P M 0.20 mg/L 1 0.43 0 Beryllium 8/22/2013 11:16:21 P M 0.010 mg/L 1 < 0.010 0 Boron 8/27/2013 12:48:40 P M 5.00 mg/L 10 361 0 Cadmium 8/22/2013 11:16:21 P M 0.020 mg/L 1 0.029 0 Chromium 8/22/2013 11:16:21 P M 0.10 mg/L 1 0.46 0 Copper 8/22/2013 11:16:21 P M 0.10 mg/L 1 0.40 0 Iron 8/22/2013 11:16:21 P M 0.50 mg/L 1 142 0 Lead 8/22/2013 11:16:21 P M 0.20 mg/L 1 < 0.20 0 Manganese 8/22/2013 11:16:21 P M 0.10 mg/L 1 67.2 0 Nickel 8/22/2013 11:16:21 P M 0.10 mg/L 1 1.33 0 Selenium 8/22/2013 11:16:21 P M 0.20 mg/L 1 2.37 0 Silver 8/22/2013 11:16:21 P M 0.050 mg/L 1 < 0.050 0 Zinc 8/22/2013 11:16:21 P M 0.10 mg/L 1 4.49 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 8/27/2013 0.02 mg/L 1 0.46 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 8/20/2013 6:28:00 PM 18 mg/L 3.57 < 18 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Wednesday, September 11, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1308C57 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 8/26/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 11-Sep-13 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1308C57 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 8/26/2013 9:30:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1308C57
Lab ID: G1308C57-001

DF 

# Geochemical Testing Date: 11-Sep-13

Received Date: 8/26/2013 4:21:16 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 8/27/2013 2:12:19 PM 100 mg/L 5 29800 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 8/27/2013 2:11:57 PM 100 mg/L 20 11000 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: HJC

BOD 5-day 8/28/2013 8:00:00 AM 3 mg/L 3 6 0 

### INORGANIC METALS USGS I-1230-85 Analyst: MLR

Hexavalent Chromium 8/26/2013 5:32:00 PM 0.020 mg/L 1 < 0.020 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 8/29/2013 4:01:00 PM 1000 mg/L 200 11300 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Iron, dissolved 8/30/2013 4:19:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 8/30/2013 4:19:00 PM 0.02 mg/L 1 0.52 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 8/29/2013 10:42:26 A M 0.100 mg/L 500 0.930 0 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Aluminum 8/29/2013 6:19:00 AM 1.0 mg/L 1 252 0 Arsenic 8/29/2013 6:19:00 AM 0.20 mg/L 1 1.81 0 Beryllium 8/29/2013 6:19:00 AM 0.010 mg/L 1 0.024 0 Boron 8/29/2013 3:01:58 PM 5.00 mg/L 10 442 0 Cadmium 8/29/2013 6:19:00 AM 0.020 mg/L 1 0.025 0 Chromium 8/29/2013 6:19:00 AM 0.10 mg/L 1 2.29 0 Copper 8/29/2013 6:19:00 AM 0.10 mg/L 1 1.49 0 Iron 8/29/2013 6:19:00 AM 0.50 mg/L 1 691 0 Lead 8/29/2013 6:19:00 AM 0.20 mg/L 1 0.63 0 Manganese 8/29/2013 6:19:00 AM 0.10 mg/L 1 75.3 0 Nickel 8/29/2013 6:19:00 AM 0.10 mg/L 1 2.94 0 Selenium 8/29/2013 6:19:00 AM 0.20 mg/L 1 5.80 0 Silver 8/29/2013 6:19:00 AM 0.050 mg/L 1 < 0.050 0 Zinc 8/29/2013 6:19:00 AM 0.10 mg/L 1 4.60 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 9/10/2013 0.02 mg/L 1 2.29 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 8/27/2013 6:03:00 PM 5 mg/L 3.7 < 5 0

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 8/26/2013 9:45:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1308C57
Lab ID: G1308C57-002

DF 

# Geochemical Testing Date: 11-Sep-13

Received Date: 8/26/2013 4:21:16 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 8/27/2013 2:11:59 PM 1 mg/L 1 < 1 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 8/27/2013 2:12:18 PM 20 mg/L 1 22500 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: HJC

BOD 5-day 8/28/2013 8:00:00 AM 2 mg/L 1.5 < 2 25 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 8/29/2013 4:01:00 PM 1000 mg/L 200 11900 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Iron, dissolved 8/30/2013 4:10:51 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 8/30/2013 4:10:51 PM 0.02 mg/L 1 0.06 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 8/29/2013 10:44:04 A M 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Aluminum 8/30/2013 4:08:16 PM 0.1 mg/L 1 < 0.1 0 Arsenic 8/30/2013 4:08:16 PM 0.02 mg/L 1 < 0.02 0 Beryllium 8/30/2013 4:08:16 PM 0.001 mg/L 1 < 0.001 0.8 Boron 8/30/2013 12:41:37 P M 2.50 mg/L 50 271 0 Cadmium 8/30/2013 4:08:16 PM 0.002 mg/L 1 < 0.002 0 Chromium 8/30/2013 4:08:16 PM 0.01 mg/L 1 < 0.01 0 Copper 8/30/2013 4:08:16 PM 0.01 mg/L 1 < 0.01 0.1 Iron 8/30/2013 4:08:16 PM 0.05 mg/L 1 < 0.05 0 Lead 8/30/2013 4:08:16 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 8/30/2013 4:08:16 PM 0.01 mg/L 1 0.54 0 Nickel 8/30/2013 4:08:16 PM 0.01 mg/L 1 < 0.01 0 Selenium 8/30/2013 4:08:16 PM 0.02 mg/L 1 0.07 3.4 Silver 8/30/2013 4:08:16 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 8/30/2013 4:08:16 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 9/10/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 8/27/2013 6:03:00 PM 5 mg/L 1.02 < 5 15

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Friday, September 13, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 M(a) Order No.: G1309055 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 5 sample(s) on 9/3/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 7

### 13-Sep-13 Date: 

# Geochemical Testing
Project: Keystone 611 M(a) CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1309055 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 7

### Project: Keystone 611 M(a) Client Sample ID: Outfall 101

Collection Date: 9/3/2013 10:30:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1309055
Lab ID: G1309055-001

DF 

# Geochemical Testing Date: 13-Sep-13

Received Date: 9/3/2013 6:22:24 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 9/4/2013 2:43:08 PM 1 mg/L 1 5 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 9/4/2013 2:33:52 PM 20 mg/L 1 27700 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 9/4/2013 6:52:00 AM 2 mg/L 1.5 2 25 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 9/4/2013 1:03:00 PM 1000 mg/L 200 13900 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Iron, dissolved 9/5/2013 9:28:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 9/5/2013 9:28:00 PM 0.02 mg/L 1 0.12 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 9/5/2013 11:29:28 AM 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Aluminum 9/5/2013 9:24:00 PM 0.1 mg/L 1 < 0.1 0 Arsenic 9/5/2013 9:24:00 PM 0.02 mg/L 1 < 0.02 0 Beryllium 9/5/2013 9:24:00 PM 0.001 mg/L 1 < 0.001 0.8 Boron 9/6/2013 1:48:06 PM 2.50 mg/L 50 289 0 Cadmium 9/5/2013 9:24:00 PM 0.002 mg/L 1 < 0.002 0 Chromium 9/5/2013 9:24:00 PM 0.01 mg/L 1 0.01 0 Copper 9/5/2013 9:24:00 PM 0.01 mg/L 1 < 0.01 0.1 Iron 9/5/2013 9:24:00 PM 0.05 mg/L 1 < 0.05 0 Lead 9/5/2013 9:24:00 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 9/5/2013 9:24:00 PM 0.01 mg/L 1 0.03 0 Nickel 9/5/2013 9:24:00 PM 0.01 mg/L 1 0.01 0 Selenium 9/5/2013 9:24:00 PM 0.02 mg/L 1 0.13 3.4 Silver 9/5/2013 9:24:00 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 9/5/2013 9:24:00 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 9/10/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 9/5/2013 1:29:00 PM 5 mg/L 1.08 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 7

### Project: Keystone 611 M(a) Client Sample ID: FGD Influent

Collection Date: 9/3/2013 10:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1309055
Lab ID: G1309055-002

DF 

# Geochemical Testing Date: 13-Sep-13

Received Date: 9/3/2013 6:22:24 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 9/4/2013 2:33:52 PM 100 mg/L 5 37100 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 9/4/2013 2:43:09 PM 100 mg/L 20 12300 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 9/4/2013 6:52:00 AM 3 mg/L 3 9 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 9/4/2013 1:03:00 PM 1000 mg/L 200 16500 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Iron, dissolved 9/6/2013 12:14:00 AM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 9/6/2013 12:14:00 AM 0.02 mg/L 1 1.09 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 9/5/2013 11:31:06 AM 0.100 mg/L 500 0.945 0 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Aluminum 9/6/2013 9:47:19 PM 1.0 mg/L 1 373 0 Arsenic 9/6/2013 9:47:19 PM 0.20 mg/L 1 2.26 0 Beryllium 9/6/2013 9:47:19 PM 0.010 mg/L 1 0.046 0 Boron 9/6/2013 9:47:19 PM 0.50 mg/L 1 423 0 Cadmium 9/6/2013 9:47:19 PM 0.020 mg/L 1 0.054 0 Chromium 9/6/2013 9:47:19 PM 0.10 mg/L 1 2.45 0 Copper 9/6/2013 9:47:19 PM 0.10 mg/L 1 1.80 0 Iron 9/6/2013 9:47:19 PM 0.50 mg/L 1 744 0 Lead 9/6/2013 9:47:19 PM 0.20 mg/L 1 0.81 0 Manganese 9/6/2013 9:47:19 PM 0.10 mg/L 1 71.3 0 Nickel 9/6/2013 9:47:19 PM 0.10 mg/L 1 2.56 0 Selenium 9/6/2013 9:47:19 PM 0.20 mg/L 1 6.29 0 Silver 9/6/2013 9:47:19 PM 0.050 mg/L 1 < 0.050 0 Zinc 9/6/2013 9:47:19 PM 0.10 mg/L 1 4.51 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 9/10/2013 0.02 mg/L 1 2.45 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 9/5/2013 1:31:00 PM 20 mg/L 4 < 20 0

I.D. 56-00306 PA DEP 

# Page 4 of 7

### Project: Keystone 611 M(a) Client Sample ID: Outfall 106

Collection Date: 9/3/2013 8:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1309055
Lab ID: G1309055-003

DF 

# Geochemical Testing Date: 13-Sep-13

Received Date: 9/3/2013 6:22:24 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 9/4/2013 2:43:09 PM 5 mg/L 1 < 5 30 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Aluminum 9/6/2013 12:25:00 AM 0.1 mg/L 1 0.1 0 Chromium 9/6/2013 12:25:00 AM 0.01 mg/L 1 < 0.01 0 Iron 9/6/2013 12:25:00 AM 0.05 mg/L 1 0.16 0 Manganese 9/6/2013 12:25:00 AM 0.01 mg/L 1 0.11 0 Nickel 9/6/2013 12:25:00 AM 0.01 mg/L 1 < 0.01 0 Titanium 9/6/2013 12:25:00 AM 0.005 mg/L 1 < 0.005 0 Zinc 9/6/2013 12:25:00 AM 0.01 mg/L 1 < 0.01 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: ACG

Oil & Grease 9/6/2013 3:43:00 PM 5 mg/L 1 < 5 15

I.D. 56-00306 PA DEP 

# Page 5 of 7

### Project: Keystone 611 M(a) Client Sample ID: Plum Creek

Collection Date: 9/3/2013 7:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1309055
Lab ID: G1309055-004

DF 

# Geochemical Testing Date: 13-Sep-13

Received Date: 9/3/2013 6:22:24 PM 

# Laboratory Results

Sampled By : Client

MCL
INORGANIC NON METALS SM 4500-CO2D Analyst: MBG

Bicarbonate 9/4/2013 2:03:00 PM 5 mg/L CaCO3 1 46 0 

### INORGANIC NON-METALS SM 4500-CO2 Analyst: MBG

Carbonate 9/4/2013 2:03:00 PM 5 mg/L CaCO3 1 < 5 0 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 9/4/2013 2:33:51 PM 20 mg/L 1 136 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 9/4/2013 2:43:09 PM 5 mg/L 1 8 0 

### INORGANIC NON-METALS ASTM D1067-06 Analyst: MBG

Alkalinity to pH 4.5 9/4/2013 2:03:00 PM 5 mg/L CaCO3 1 46 0 

### INORGANIC NON-METALS EPA 300.0 Analyst: MLR

Nitrate Nitrogen 9/3/2013 9:40:00 PM 0.05 mg/L as N 1 0.37 0 Nitrite Nitrogen 9/3/2013 9:40:00 PM 0.05 mg/L as N 1 < 0.05 0 Nitrate - Nitrite 9/3/2013 9:40:00 PM 0.05 mg/L as N 1 0.37 0 

### INORGANIC NON-METALS EPA 300.0 Analyst: MLR

Chloride 9/3/2013 9:40:00 PM 1 mg/L 1 13 0 Fluoride 9/3/2013 9:40:00 PM 0.1 mg/L 1 < 0.1 0 Sulfate 9/3/2013 9:40:00 PM 2 mg/L 1 38 0 

### INORGANIC NON-METALS EPA 350.1 Analyst: SLY

Ammonia Nitrogen - Distilled 9/6/2013 12:09:26 PM 0.10 mg/L as N 1 < 0.10 0 

### INORGANICS NON METALS SM 4500-SIO2 C Analyst: MLR

Silica, total 9/4/2013 4:10:00 PM 0.20 mg/L 1 3.5 0 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Barium 9/6/2013 12:41:00 AM 0.01 mg/L 1 0.05 0 Boron 9/6/2013 2:41:24 PM 0.05 mg/L 1 < 0.05 0 Calcium 9/6/2013 12:41:00 AM 0.1 mg/L 1 20.0 0 Iron 9/6/2013 12:41:00 AM 0.05 mg/L 1 0.41 0 Magnesium 9/6/2013 12:41:00 AM 0.1 mg/L 1 6.1 0 Manganese 9/6/2013 12:41:00 AM 0.01 mg/L 1 0.09 0 Potassium 9/6/2013 12:41:00 AM 0.5 mg/L 1 1.8 0 Sodium 9/6/2013 12:41:00 AM 0.2 mg/L 1 15.1 0 Strontium 9/6/2013 12:41:00 AM 0.01 mg/L 1 0.17 0 

### INDICATOR ORGANIC PARAMETERS SM 20 5310-C Analyst: JDH

Total Organic Carbon 9/11/2013 10:41:00 P M 0.5 mg/L 1 1.9 0

I.D. 56-00306 PA DEP 

# Page 6 of 7

### Project: Keystone 611 M(a) Client Sample ID: Crooked Creek

Collection Date: 9/3/2013 6:45:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1309055
Lab ID: G1309055-005

DF 

# Geochemical Testing Date: 13-Sep-13

Received Date: 9/3/2013 6:22:24 PM 

# Laboratory Results

Sampled By : Client

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 9/4/2013 2:33:51 PM 20 mg/L 1 242 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 9/4/2013 2:43:09 PM 5 mg/L 1 140 

### INORGANIC NON-METALS ASTM D1067-06 Analyst: MBG

Alkalinity to pH 4.5 9/4/2013 2:11:00 PM 5 mg/L CaCO3 1 73 0 

### INORGANIC NON-METALS EPA 300.0 Analyst: MLR

Nitrate Nitrogen 9/3/2013 9:57:00 PM 0.05 mg/L as N 1 0.49 0 Nitrite Nitrogen 9/3/2013 9:57:00 PM 0.05 mg/L as N 1 < 0.05 0 Nitrate - Nitrite 9/3/2013 9:57:00 PM 0.05 mg/L as N 1 0.49 0 

### INORGANIC NON-METALS EPA 300.0 Analyst: MLR

Chloride 9/3/2013 9:57:00 PM 1 mg/L 1 34 0 Sulfate 9/3/2013 9:57:00 PM 2 mg/L 1 69 0 

### INORGANICS NON METALS SM 4500-SIO2 C Analyst: MLR

Silica, total 9/4/2013 4:10:00 PM 0.20 mg/L 1 3.4 0 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Calcium 9/6/2013 3:47:42 PM 0.1 mg/L 1 31.7 0 Iron 9/6/2013 3:47:42 PM 0.05 mg/L 1 1.32 0 Magnesium 9/6/2013 3:47:42 PM 0.1 mg/L 1 8.6 0 Manganese 9/6/2013 3:47:42 PM 0.01 mg/L 1 0.30 0 Potassium 9/6/2013 3:47:42 PM 0.5 mg/L 1 2.3 0 Sodium 9/6/2013 3:47:42 PM 0.2 mg/L 1 41.7 0 

### INDICATOR ORGANIC PARAMETERS SM 20 5310-C Analyst: JDH

Total Organic Carbon 9/12/2013 2:22:00 AM 0.5 mg/L 1 4.4 0

I.D. 56-00306 PA DEP 

# Page 7 of 7

# Wednesday, September 18, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 M(b) Order No.: G1309354 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 9/9/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 18-Sep-13 Date: 

# Geochemical Testing
Project: Keystone 611 M(b) CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1309354 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 M(b) Client Sample ID: Outfall 101

Collection Date: 9/9/2013 9:45:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1309354
Lab ID: G1309354-001

DF 

# Geochemical Testing Date: 18-Sep-13

Received Date: 9/9/2013 4:47:50 PM 

# Laboratory Results

Sampled By : NRG

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 9/10/2013 1:20:32 PM 1 mg/L 1 1 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 9/10/2013 1:19:53 PM 20 mg/L 1 26400 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 9/11/2013 6:19:00 AM 2 mg/L 1.5 7 25 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 9/10/2013 9:57:00 AM 1000 mg/L 200 15200 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Iron, dissolved 9/10/2013 8:30:34 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 9/10/2013 8:30:34 PM 0.02 mg/L 1 0.32 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 9/11/2013 9:58:34 AM 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Aluminum 9/10/2013 8:12:54 PM 0.1 mg/L 1 < 0.1 0 Arsenic 9/10/2013 8:12:54 PM 0.02 mg/L 1 < 0.02 0 Beryllium 9/10/2013 8:12:54 PM 0.001 mg/L 1 < 0.001 0.8 Boron 9/11/2013 10:49:53 A M 2.50 mg/L 50 300 0 Cadmium 9/10/2013 8:12:54 PM 0.002 mg/L 1 < 0.002 0 Chromium 9/10/2013 8:12:54 PM 0.01 mg/L 1 < 0.01 0 Copper 9/10/2013 8:12:54 PM 0.01 mg/L 1 < 0.01 0.1 Iron 9/10/2013 8:12:54 PM 0.05 mg/L 1 0.21 0 Lead 9/10/2013 8:12:54 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 9/10/2013 8:12:54 PM 0.01 mg/L 1 0.08 0 Nickel 9/10/2013 8:12:54 PM 0.01 mg/L 1 < 0.01 0 Selenium 9/10/2013 8:12:54 PM 0.02 mg/L 1 0.40 3.4 Silver 9/10/2013 8:12:54 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 9/10/2013 8:12:54 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 9/12/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: MCO

Oil & Grease 9/10/2013 6:27:00 PM 5 mg/L 1 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 M(b) Client Sample ID: FGD Influent

Collection Date: 9/9/2013 9:30:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1309354
Lab ID: G1309354-002

DF 

# Geochemical Testing Date: 18-Sep-13

Received Date: 9/9/2013 4:47:50 PM 

# Laboratory Results

Sampled By : NRG IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 9/10/2013 1:19:53 PM 100 mg/L 5 25800 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 9/10/2013 1:20:32 PM 100 mg/L 20 3870 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 9/11/2013 6:19:00 AM 2 mg/L 1.5 5 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 9/10/2013 9:57:00 AM 1000 mg/L 200 16400 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Iron, dissolved 9/10/2013 8:33:09 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 9/10/2013 8:33:09 PM 0.02 mg/L 1 1.02 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 9/11/2013 10:00:11 A M 0.100 mg/L 500 0.431 0 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Aluminum 9/11/2013 5:08:24 PM 1.0 mg/L 1 194 0 Arsenic 9/11/2013 5:08:24 PM 0.20 mg/L 1 1.35 0 Beryllium 9/11/2013 5:08:24 PM 0.010 mg/L 1 0.029 0 Boron 9/12/2013 6:31:00 PM 5.00 mg/L 10 425 0 Cadmium 9/12/2013 6:35:00 PM 0.020 mg/L 1 0.028 0 Cadmium 9/11/2013 5:08:24 PM 0.020 mg/L 1 0.046 0 Chromium 9/11/2013 5:08:24 PM 0.10 mg/L 1 1.35 0 Copper 9/11/2013 5:08:24 PM 0.10 mg/L 1 1.13 0 Iron 9/11/2013 5:08:24 PM 0.50 mg/L 1 440 0 Lead 9/11/2013 5:08:24 PM 0.20 mg/L 1 0.44 0 Manganese 9/11/2013 5:08:24 PM 0.10 mg/L 1 65.7 0 Nickel 9/11/2013 5:08:24 PM 0.10 mg/L 1 1.92 0 Selenium 9/11/2013 5:08:24 PM 0.20 mg/L 1 4.45 0 Silver 9/11/2013 5:08:24 PM 0.050 mg/L 1 < 0.050 0 Zinc 9/11/2013 5:08:24 PM 0.10 mg/L 1 2.85 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 9/17/2013 0.02 mg/L 1 1.35 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: MCO

Oil & Grease 9/10/2013 6:27:00 PM 18 mg/L 3.57 < 18 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Friday, September 27, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1309753 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 9/16/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 27-Sep-13 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1309753 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 9/16/2013 9:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1309753
Lab ID: G1309753-001

DF 

# Geochemical Testing Date: 27-Sep-13

Received Date: 9/16/2013 5:06:31 PM 

# Laboratory Results

Sampled By : NRG

MCL
PHYSICAL TESTS SM 2540D Analyst: GMG

Total suspended solids 9/18/2013 12:56:04 P M 1 mg/L 1 7 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 9/17/2013 2:11:40 PM 100 mg/L 5 26700 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 9/18/2013 5:59:00 AM 2 mg/L 1.5 < 2 25 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: CLS

Chloride 9/17/2013 1:25:00 PM 1000 mg/L 200 15600 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Iron, dissolved 9/18/2013 8:22:29 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 9/18/2013 8:22:29 PM 0.02 mg/L 1 0.13 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 9/19/2013 10:51:41 A M 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Aluminum 9/18/2013 8:19:54 PM 0.1 mg/L 1 < 0.1 0 Arsenic 9/18/2013 8:19:54 PM 0.02 mg/L 1 < 0.02 0 Beryllium 9/18/2013 8:19:54 PM 0.001 mg/L 1 < 0.001 0.8 Boron 9/19/2013 3:02:15 PM 2.50 mg/L 50 295 0 Cadmium 9/18/2013 8:19:54 PM 0.002 mg/L 1 < 0.002 0 Chromium 9/18/2013 8:19:54 PM 0.01 mg/L 1 < 0.01 0 Copper 9/18/2013 8:19:54 PM 0.01 mg/L 1 < 0.01 0.1 Iron 9/18/2013 8:19:54 PM 0.05 mg/L 1 < 0.05 0 Lead 9/18/2013 8:19:54 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 9/18/2013 8:19:54 PM 0.01 mg/L 1 0.07 0 Nickel 9/18/2013 8:19:54 PM 0.01 mg/L 1 < 0.01 0 Selenium 9/18/2013 8:19:54 PM 0.02 mg/L 1 0.14 3.4 Silver 9/18/2013 8:19:54 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 9/18/2013 8:19:54 PM 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 9/20/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: MCO

Oil & Grease 9/24/2013 5:20:00 PM 5 mg/L 1 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 9/16/2013 9:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1309753
Lab ID: G1309753-002

DF 

# Geochemical Testing Date: 27-Sep-13

Received Date: 9/16/2013 5:06:31 PM 

# Laboratory Results

Sampled By : NRG IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 9/17/2013 2:11:40 PM 100 mg/L 5 27800 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 9/17/2013 2:11:21 PM 100 mg/L 20 11200 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 9/18/2013 5:59:00 AM 3 mg/L 3 11 0 

### INORGANIC METALS USGS I-1230-85 Analyst: CLS

Hexavalent Chromium 9/16/2013 5:45:00 PM 0.020 mg/L 1 < 0.020 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: CLS

Chloride 9/17/2013 1:25:00 PM 1000 mg/L 200 16000 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Iron, dissolved 9/19/2013 7:37:39 PM 0.10 mg/L 2 < 0.10 0 Selenium, dissolved 9/19/2013 7:37:39 PM 0.04 mg/L 2 1.66 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 9/19/2013 10:53:17 A M 0.100 mg/L 500 0.432 0 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Aluminum 9/19/2013 4:03:43 PM 1.0 mg/L 1 265 0 Arsenic 9/19/2013 4:03:43 PM 0.20 mg/L 1 1.71 0 Beryllium 9/19/2013 4:03:43 PM 0.010 mg/L 1 0.036 0 Boron 9/23/2013 1:28:15 PM 5.00 mg/L 10 439 0 Cadmium 9/19/2013 4:03:43 PM 0.020 mg/L 1 0.047 0 Chromium 9/19/2013 4:03:43 PM 0.10 mg/L 1 1.61 0 Copper 9/19/2013 4:03:43 PM 0.10 mg/L 1 1.22 0 Iron 9/19/2013 4:03:43 PM 0.50 mg/L 1 474 0 Lead 9/19/2013 4:03:43 PM 0.20 mg/L 1 0.62 0 Manganese 9/19/2013 4:03:43 PM 0.10 mg/L 1 64.3 0 Nickel 9/19/2013 4:03:43 PM 0.10 mg/L 1 1.90 0 Selenium 9/19/2013 4:03:43 PM 0.20 mg/L 1 5.17 0 Silver 9/19/2013 4:03:43 PM 0.050 mg/L 1 < 0.050 0 Zinc 9/19/2013 4:03:43 PM 0.10 mg/L 1 3.46 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 9/23/2013 0.02 mg/L 1 1.61 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: MCO

Oil & Grease 9/24/2013 5:20:00 PM 18 mg/L 3.57 < 18 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Thursday, October 03, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1309A66 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 9/24/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 03-Oct-13 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1309A66 

# CASE NARRATIVE

Samples were not filtered in the field for dissolved metals; samples were lab filtered. No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 9/23/2013 9:30:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1309A66
Lab ID: G1309A66-001

DF 

# Geochemical Testing Date: 03-Oct-13

Received Date: 9/24/2013 6:37:01 AM 

# Laboratory Results

Sampled By : NRG

MCL
PHYSICAL TESTS SM 2540D Analyst: GMG

Total suspended solids 9/24/2013 3:01:43 PM 1 mg/L 1 < 1 10 

### INORGANIC NON-METALS SM 2540 C Analyst: GMG

Total dissolved solids 9/24/2013 2:59:07 PM 20 mg/L 1 27400 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 9/25/2013 5:49:00 AM 2 mg/L 1.5 < 2 25 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 9/24/2013 12:57:00 P M 1000 mg/L 200 13900 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Iron, dissolved 9/25/2013 2:38:50 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 9/25/2013 2:38:50 PM 0.02 mg/L 1 0.13 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 9/25/2013 10:18:13 A M 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Aluminum 9/25/2013 2:36:14 PM 0.1 mg/L 1 < 0.1 0 Arsenic 9/25/2013 2:36:14 PM 0.02 mg/L 1 < 0.02 0 Beryllium 9/25/2013 2:36:14 PM 0.001 mg/L 1 < 0.001 0.8 Boron 9/27/2013 10:14:38 A M 2.50 mg/L 50 296 0 Cadmium 9/25/2013 2:36:14 PM 0.002 mg/L 1 < 0.002 0 Chromium 9/25/2013 2:36:14 PM 0.01 mg/L 1 < 0.01 0 Copper 9/25/2013 2:36:14 PM 0.01 mg/L 1 < 0.01 0.1 Iron 9/25/2013 2:36:14 PM 0.05 mg/L 1 < 0.05 0 Lead 9/25/2013 2:36:14 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 9/25/2013 2:36:14 PM 0.01 mg/L 1 0.08 0 Nickel 9/25/2013 2:36:14 PM 0.01 mg/L 1 < 0.01 0 Selenium 9/25/2013 2:36:14 PM 0.02 mg/L 1 0.13 3.4 Silver 9/25/2013 2:36:14 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 9/25/2013 2:36:14 PM 0.01 mg/L 1 0.02 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 9/26/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: MCO

Oil & Grease 10/1/2013 12:44:00 P M 5 mg/L 1 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 9/23/2013 9:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1309A66
Lab ID: G1309A66-002

DF 

# Geochemical Testing Date: 03-Oct-13

Received Date: 9/24/2013 6:37:01 AM 

# Laboratory Results

Sampled By : NRG IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: GMG

Total dissolved solids 9/24/2013 2:59:07 PM 200 mg/L 10 24700 0 

### PHYSICAL TESTS SM 2540D Analyst: GMG

Total suspended solids 9/24/2013 3:01:40 PM 200 mg/L 40 7040 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 9/25/2013 5:49:00 AM 2 mg/L 1.5 2 0 

### INORGANIC METALS USGS I-1230-85 Analyst: SEF

Hexavalent Chromium 9/24/2013 7:15:00 AM 0.020 mg/L 1 < 0.020 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 9/24/2013 12:57:00 P M 1000 mg/L 200 8590 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Iron, dissolved 9/25/2013 2:41:24 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 9/25/2013 2:41:24 PM 0.02 mg/L 1 0.41 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 9/25/2013 10:19:50 A M 0.100 mg/L 500 0.560 0 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Aluminum 9/27/2013 9:43:07 PM 1.0 mg/L 1 207 0 Arsenic 9/27/2013 9:43:07 PM 0.20 mg/L 1 1.51 0 Beryllium 9/27/2013 9:43:07 PM 0.010 mg/L 1 0.024 0 Boron 10/1/2013 8:06:52 PM 5.00 mg/L 10 277 0 Cadmium 9/27/2013 9:43:07 PM 0.020 mg/L 1 0.032 0 Chromium 9/27/2013 9:43:07 PM 0.10 mg/L 1 1.43 0 Copper 9/27/2013 9:43:07 PM 0.10 mg/L 1 1.12 0 Iron 9/27/2013 9:43:07 PM 0.50 mg/L 1 427 0 Lead 9/27/2013 9:43:07 PM 0.20 mg/L 1 0.53 0 Manganese 9/27/2013 9:43:07 PM 0.10 mg/L 1 44.2 0 Nickel 9/27/2013 9:43:07 PM 0.10 mg/L 1 1.64 0 Selenium 9/27/2013 9:43:07 PM 0.20 mg/L 1 3.70 0 Silver 9/27/2013 9:43:07 PM 0.050 mg/L 1 < 0.050 0 Zinc 9/27/2013 9:43:07 PM 0.10 mg/L 1 3.02 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 9/30/2013 0.02 mg/L 1 1.43 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: MCO

Oil & Grease 10/1/2013 12:45:00 P M 18 mg/L 3.57 < 18 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Wednesday, October 09, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 Q(a) Order No.: G1309E08 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 9/30/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 09-Oct-13 Date: 

# Geochemical Testing
Project: Keystone 611 Q(a) CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1309E08 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 Q(a) Client Sample ID: Outfall 101

Collection Date: 9/30/2013 9:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1309E08
Lab ID: G1309E08-001

DF 

# Geochemical Testing Date: 09-Oct-13

Received Date: 9/30/2013 4:32:34 PM 

# Laboratory Results

Sampled By : NRG

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 10/1/2013 2:17:17 PM 1 mg/L 1 8 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 10/1/2013 2:16:56 PM 20 mg/L 1 27400 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 10/2/2013 6:13:00 AM 2 mg/L 1.5 < 2 25 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: CLS

Chloride 10/1/2013 10:29:00 A M 1000 mg/L 200 15600 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Iron, dissolved 10/3/2013 12:36:12 P M 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 10/3/2013 12:36:12 P M 0.02 mg/L 1 < 0.02 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 10/3/2013 9:02:46 AM 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Aluminum 10/3/2013 12:33:39 P M 0.1 mg/L 1 < 0.1 0 Arsenic 10/3/2013 12:33:39 P M 0.02 mg/L 1 < 0.02 0 Beryllium 10/3/2013 12:33:39 P M 0.001 mg/L 1 < 0.001 0.8 Boron 10/7/2013 9:56:20 AM 2.50 mg/L 50 291 0 Cadmium 10/3/2013 12:33:39 P M 0.002 mg/L 1 0.003 0 Chromium 10/3/2013 12:33:39 P M 0.01 mg/L 1 < 0.01 0 Copper 10/3/2013 12:33:39 P M 0.01 mg/L 1 < 0.01 0.1 Iron 10/3/2013 12:33:39 P M 0.05 mg/L 1 < 0.05 0 Lead 10/3/2013 12:33:39 P M 0.02 mg/L 1 < 0.02 0.1 Manganese 10/3/2013 12:33:39 P M 0.01 mg/L 1 0.10 0 Nickel 10/3/2013 12:33:39 P M 0.01 mg/L 1 0.01 0 Selenium 10/3/2013 12:33:39 P M 0.02 mg/L 1 < 0.02 3.4 Silver 10/3/2013 12:33:39 P M 0.005 mg/L 1 < 0.005 0.1 Zinc 10/3/2013 12:33:39 P M 0.01 mg/L 1 0.02 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 10/4/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: MCO

Oil & Grease 10/3/2013 2:17:00 PM 5 mg/L 1 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 Q(a) Client Sample ID: FGD Influent

Collection Date: 9/30/2013 8:45:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1309E08
Lab ID: G1309E08-002

DF 

# Geochemical Testing Date: 09-Oct-13

Received Date: 9/30/2013 4:32:34 PM 

# Laboratory Results

Sampled By : NRG IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 10/1/2013 2:16:55 PM 100 mg/L 5 28900 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 10/1/2013 2:17:16 PM 100 mg/L 20 4140 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 10/2/2013 6:13:00 AM 3 mg/L 3 < 3 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: CLS

Chloride 10/1/2013 10:29:00 A M 1000 mg/L 200 15800 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Iron, dissolved 10/3/2013 12:38:47 P M 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 10/3/2013 12:38:47 P M 0.02 mg/L 1 0.72 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 10/3/2013 9:04:25 AM 0.100 mg/L 500 0.214 0 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Aluminum 10/2/2013 6:35:00 PM 1.0 mg/L 1 123 0 Arsenic 10/2/2013 6:35:00 PM 0.20 mg/L 1 0.92 0 Beryllium 10/2/2013 6:35:00 PM 0.010 mg/L 1 0.017 0 Boron 10/3/2013 10:37:07 A M 5.00 mg/L 10 404 0 Cadmium 10/2/2013 6:35:00 PM 0.020 mg/L 1 0.037 0 Chromium 10/2/2013 6:35:00 PM 0.10 mg/L 1 0.99 0 Copper 10/2/2013 6:35:00 PM 0.10 mg/L 1 0.68 0 Iron 10/2/2013 6:35:00 PM 0.50 mg/L 1 252 0 Lead 10/2/2013 6:35:00 PM 0.20 mg/L 1 0.28 0 Manganese 10/2/2013 6:35:00 PM 0.10 mg/L 1 63.3 0 Nickel 10/2/2013 6:35:00 PM 0.10 mg/L 1 2.04 0 Selenium 10/2/2013 6:35:00 PM 0.20 mg/L 1 2.51 0 Silver 10/2/2013 6:35:00 PM 0.050 mg/L 1 < 0.050 0 Zinc 10/2/2013 6:35:00 PM 0.10 mg/L 1 2.63 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 10/4/2013 0.02 mg/L 1 0.99 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: MCO

Oil & Grease 10/3/2013 2:18:00 PM 18 mg/L 3.57 < 18 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Tuesday, October 22, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 Q(b) Order No.: G1310343 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 10/7/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 22-Oct-13 Date: 

# Geochemical Testing
Project: Keystone 611 Q(b) CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1310343 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 Q(b) Client Sample ID: Outfall 101

Collection Date: 10/7/2013 8:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1310343
Lab ID: G1310343-001

DF 

# Geochemical Testing Date: 22-Oct-13

Received Date: 10/7/2013 4:29:18 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 10/8/2013 1:02:29 PM 1 mg/L 1 1 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 10/8/2013 1:02:46 PM 20 mg/L 1 25000 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 10/9/2013 6:11:00 AM 2 mg/L 1.5 4 25 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: CLS

Chloride 10/8/2013 4:25:00 PM 1000 mg/L 200 15300 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Iron, dissolved 10/9/2013 7:02:25 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 10/9/2013 7:02:25 PM 0.02 mg/L 1 < 0.02 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 10/8/2013 2:54:01 PM 0.0002 mg/L 1 < 0.0002 0 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Aluminum 10/9/2013 6:59:51 PM 0.1 mg/L 1 < 0.1 0 Arsenic 10/9/2013 6:59:51 PM 0.02 mg/L 1 < 0.02 0 Beryllium 10/9/2013 6:59:51 PM 0.001 mg/L 1 < 0.001 0.8 Boron 10/11/2013 9:55:41 A M 2.50 mg/L 50 291 0 Cadmium 10/9/2013 6:59:51 PM 0.002 mg/L 1 0.002 0 Chromium 10/9/2013 6:59:51 PM 0.01 mg/L 1 < 0.01 0 Copper 10/9/2013 6:59:51 PM 0.01 mg/L 1 < 0.01 0.1 Iron 10/9/2013 6:59:51 PM 0.05 mg/L 1 < 0.05 0 Lead 10/9/2013 6:59:51 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 10/9/2013 6:59:51 PM 0.01 mg/L 1 0.06 0 Nickel 10/9/2013 6:59:51 PM 0.01 mg/L 1 < 0.01 0 Selenium 10/9/2013 6:59:51 PM 0.02 mg/L 1 < 0.02 3.4 Silver 10/9/2013 6:59:51 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 10/9/2013 6:59:51 PM 0.01 mg/L 1 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 10/17/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: MCO

Oil & Grease 10/8/2013 5:35:00 PM 5 mg/L 1.1 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 Q(b) Client Sample ID: FGD Influent

Collection Date: 10/7/2013 8:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1310343
Lab ID: G1310343-002

DF 

# Geochemical Testing Date: 22-Oct-13

Received Date: 10/7/2013 4:29:18 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 10/8/2013 1:02:46 PM 100 mg/L 5 22900 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 10/8/2013 1:02:29 PM 100 mg/L 20 9970 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 10/9/2013 6:11:00 AM 30 mg/L 30 55 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: CLS

Chloride 10/8/2013 4:25:00 PM 1000 mg/L 200 16300 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Iron, dissolved 10/9/2013 7:05:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 10/9/2013 7:05:00 PM 0.02 mg/L 1 0.63 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 10/8/2013 2:55:37 PM 0.100 mg/L 500 0.436 0 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Aluminum 10/8/2013 11:40:15 P M 1.0 mg/L 1 202 0 Arsenic 10/8/2013 11:40:15 P M 0.20 mg/L 1 1.67 0 Beryllium 10/8/2013 11:40:15 P M 0.010 mg/L 1 0.025 0 Boron 10/9/2013 1:23:04 PM 5.00 mg/L 10 454 0 Cadmium 10/8/2013 11:40:15 P M 0.020 mg/L 1 0.051 0 Chromium 10/8/2013 11:40:15 P M 0.10 mg/L 1 1.48 0 Copper 10/8/2013 11:40:15 P M 0.10 mg/L 1 1.22 0 Iron 10/8/2013 11:40:15 P M 0.50 mg/L 1 406 0 Lead 10/8/2013 11:40:15 P M 0.20 mg/L 1 0.52 0 Manganese 10/8/2013 11:40:15 P M 0.10 mg/L 1 60.7 0 Nickel 10/8/2013 11:40:15 P M 0.10 mg/L 1 2.08 0 Selenium 10/8/2013 11:40:15 P M 0.20 mg/L 1 3.11 0 Silver 10/8/2013 11:40:15 P M 0.050 mg/L 1 < 0.050 0 Zinc 10/8/2013 11:40:15 P M 0.10 mg/L 1 3.51 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 10/17/2013 0.02 mg/L 1 1.48 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: MCO

Oil & Grease 10/8/2013 5:35:00 PM 18 mg/L 3.57 < 18 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Tuesday, October 22, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1310627 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 10/14/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 22-Oct-13 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1310627 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 10/14/2013 9:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1310627
Lab ID: G1310627-001

DF 

# Geochemical Testing Date: 22-Oct-13

Received Date: 10/14/2013 4:08:22 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 10/15/2013 1:21:47 P M 1 mg/L 1 5 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 10/15/2013 1:22:26 P M 20 mg/L 1 24600 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 10/16/2013 6:12:00 A M 2 mg/L 1.5 < 2 25 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: CLS

Chloride 10/17/2013 12:58:00 P 1000 mg/L 200 14300 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Iron, dissolved 10/16/2013 1:27:12 P M 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 10/16/2013 1:27:12 P M 0.02 mg/L 1 0.02 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 10/17/2013 8:54:56 A M 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Aluminum 10/16/2013 1:24:37 P M 0.1 mg/L 1 < 0.1 0 Arsenic 10/16/2013 1:24:37 P M 0.02 mg/L 1 < 0.02 0 Beryllium 10/16/2013 1:24:37 P M 0.001 mg/L 1 < 0.001 0.8 Boron 10/18/2013 12:35:35 P 2.50 mg/L 50 287 0 Cadmium 10/16/2013 1:24:37 P M 0.002 mg/L 1 0.002 0 Chromium 10/16/2013 1:24:37 P M 0.01 mg/L 1 < 0.01 0 Copper 10/16/2013 1:24:37 P M 0.01 mg/L 1 < 0.01 0.1 Iron 10/16/2013 1:24:37 P M 0.05 mg/L 1 < 0.05 0 Lead 10/16/2013 1:24:37 P M 0.02 mg/L 1 < 0.02 0.1 Manganese 10/16/2013 1:24:37 P M 0.01 mg/L 1 0.06 0 Nickel 10/16/2013 1:24:37 P M 0.01 mg/L 1 < 0.01 0 Selenium 10/16/2013 1:24:37 P M 0.02 mg/L 1 < 0.02 3.4 Silver 10/16/2013 1:24:37 P M 0.005 mg/L 1 < 0.005 0.1 Zinc 10/16/2013 1:24:37 P M 0.01 mg/L 1 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 10/21/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: MCO

Oil & Grease 10/16/2013 1:54:00 P M 5 mg/L 1 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 10/14/2013 9:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1310627
Lab ID: G1310627-002

DF 

# Geochemical Testing Date: 22-Oct-13

Received Date: 10/14/2013 4:08:22 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 10/15/2013 1:22:26 P M 100 mg/L 5 24500 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 10/15/2013 1:21:46 P M 100 mg/L 20 4120 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 10/16/2013 6:12:00 A M 3 mg/L 3 7 0 

### INORGANIC METALS USGS I-1230-85 Analyst: HJC

Hexavalent Chromium 10/14/2013 6:04:00 P M 0.020 mg/L 1 < 0.020 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: CLS

Chloride 10/17/2013 12:58:00 P 1000 mg/L 200 15400 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Iron, dissolved 10/16/2013 1:29:48 P M 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 10/16/2013 1:29:48 P M 0.02 mg/L 1 0.55 0 

### INORGANIC METALS SM 3112B Analyst: JEK

Mercury 10/17/2013 8:59:56 A M 0.100 mg/L 500 0.327 0 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Aluminum 10/18/2013 10:47:00 A 1.0 mg/L 1 138 0 Arsenic 10/18/2013 10:47:00 A 0.20 mg/L 1 1.21 0 Beryllium 10/18/2013 10:47:00 A 0.010 mg/L 1 0.016 0 Boron 10/21/2013 11:55:16 A 5.00 mg/L 10 415 0 Cadmium 10/18/2013 10:47:00 A 0.020 mg/L 1 0.041 0 Chromium 10/18/2013 10:47:00 A 0.10 mg/L 1 1.15 0 Copper 10/18/2013 10:47:00 A 0.10 mg/L 1 0.69 0 Iron 10/18/2013 10:47:00 A 0.50 mg/L 1 300 0 Lead 10/18/2013 10:47:00 A 0.20 mg/L 1 0.37 0 Manganese 10/18/2013 10:47:00 A 0.10 mg/L 1 57.1 0 Nickel 10/18/2013 10:47:00 A 0.10 mg/L 1 2.09 0 Selenium 10/18/2013 10:47:00 A 0.20 mg/L 1 2.73 0 Silver 10/18/2013 10:47:00 A 0.050 mg/L 1 < 0.050 0 Zinc 10/18/2013 10:47:00 A 0.10 mg/L 1 2.82 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 10/21/2013 0.02 mg/L 1 1.15 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: MCO

Oil & Grease 10/16/2013 1:54:00 P M 18 mg/L 3.57 < 18 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Friday, November 01, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1310937 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 10/21/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 01-Nov-13 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1310937 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 10/21/2013 9:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1310937
Lab ID: G1310937-001

DF 

# Geochemical Testing Date: 01-Nov-13

Received Date: 10/21/2013 5:30:53 PM 

# Laboratory Results

Sampled By : Client

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 10/22/2013 1:42:15 P M 1 mg/L 1 7 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 10/22/2013 1:41:00 P M 100 mg/L 5 28500 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 10/23/2013 6:06:00 A M 2 mg/L 1.5 < 2 25 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 10/22/2013 2:52:00 P M 1000 mg/L 200 13000 

### INORGANIC METALS EPA 200.7 Analyst: JEK

Iron, dissolved 10/24/2013 10:49:00 A 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 10/24/2013 10:49:00 A 0.02 mg/L 1 0.11 0 

### INORGANIC METALS SM 3112B Analyst: RXS

Mercury 10/28/2013 9:54:22 A M 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: JEK

Aluminum 10/24/2013 10:20:00 A 0.1 mg/L 1 < 0.1 0 Arsenic 10/24/2013 10:20:00 A 0.02 mg/L 1 < 0.02 0 Beryllium 10/24/2013 10:20:00 A 0.001 mg/L 1 < 0.001 0.8 Boron 10/25/2013 2:47:58 P M 2.50 mg/L 50 270 0 Cadmium 10/24/2013 10:20:00 A 0.002 mg/L 1 < 0.002 0 Chromium 10/24/2013 10:20:00 A 0.01 mg/L 1 < 0.01 0 Copper 10/24/2013 10:20:00 A 0.01 mg/L 1 < 0.01 0.1 Iron 10/24/2013 10:20:00 A 0.05 mg/L 1 < 0.05 0 Lead 10/24/2013 10:20:00 A 0.02 mg/L 1 < 0.02 0.1 Manganese 10/24/2013 10:20:00 A 0.01 mg/L 1 0.38 0 Nickel 10/24/2013 10:20:00 A 0.01 mg/L 1 < 0.01 0 Selenium 10/24/2013 10:20:00 A 0.02 mg/L 1 0.09 3.4 Silver 10/24/2013 10:20:00 A 0.005 mg/L 1 < 0.005 0.1 Zinc 10/24/2013 10:20:00 A 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 10/28/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: MCO

Oil & Grease 10/29/2013 5:55:00 P M 5 mg/L 1.02 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 10/21/2013 9:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1310937
Lab ID: G1310937-002

DF 

# Geochemical Testing Date: 01-Nov-13

Received Date: 10/21/2013 5:30:53 PM 

# Laboratory Results

Sampled By : Client IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 10/22/2013 1:41:00 P M 100 mg/L 5 30800 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 10/22/2013 1:42:07 P M 100 mg/L 20 8460 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 10/23/2013 6:06:00 A M 3 mg/L 3 6 0 

### INORGANIC METALS USGS I-1230-85 Analyst: HJC

Hexavalent Chromium 10/21/2013 6:20:00 P M 0.020 mg/L 1 < 0.020 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 10/22/2013 2:52:00 P M 1000 mg/L 200 14400 

### INORGANIC METALS EPA 200.7 Analyst: JEK

Iron, dissolved 10/24/2013 10:54:00 A 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 10/24/2013 10:54:00 A 0.02 mg/L 1 0.48 0 

### INORGANIC METALS SM 3112B Analyst: RXS

Mercury 10/28/2013 9:59:21 A M 0.100 mg/L 500 0.334 0 

### INORGANIC METALS EPA 200.7 Analyst: RXS

Aluminum 10/25/2013 3:13:45 P M 1.0 mg/L 1 144 0 Arsenic 10/25/2013 3:13:45 P M 0.20 mg/L 1 1.20 0 Beryllium 10/25/2013 3:13:45 P M 0.010 mg/L 1 0.019 0 Boron 10/25/2013 2:29:51 P M 5.00 mg/L 10 426 0 Cadmium 10/25/2013 3:13:45 P M 0.020 mg/L 1 0.037 0 Chromium 10/25/2013 3:13:45 P M 0.10 mg/L 1 1.07 0 Copper 10/25/2013 3:13:45 P M 0.10 mg/L 1 1.05 0 Iron 10/25/2013 3:13:45 P M 0.50 mg/L 1 392 0 Lead 10/25/2013 3:13:45 P M 0.20 mg/L 1 0.42 0 Manganese 10/25/2013 3:13:45 P M 0.10 mg/L 1 80.0 0 Nickel 10/25/2013 3:13:45 P M 0.10 mg/L 1 1.94 0 Selenium 10/25/2013 3:13:45 P M 0.20 mg/L 1 2.57 0 Silver 10/25/2013 3:13:45 P M 0.050 mg/L 1 < 0.050 0 Zinc 10/25/2013 3:13:45 P M 0.10 mg/L 1 2.71 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 10/28/2013 0.02 mg/L 1 1.07 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: MCO

Oil & Grease 10/29/2013 5:56:00 P M 19 mg/L 3.7 < 19 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Tuesday, November 05, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1310C16 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 10/28/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 05-Nov-13 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1310C16 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 10/28/2013 9:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1310C16
Lab ID: G1310C16-001

DF 

# Geochemical Testing Date: 05-Nov-13

Received Date: 10/28/2013 4:50:00 PM 

# Laboratory Results

Sampled By : Water Lab

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 10/29/2013 2:33:30 P M 1 mg/L 1 8 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 10/29/2013 2:33:55 P M 20 mg/L 1 29100 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 10/30/2013 6:37:00 A M 2 mg/L 1.5 < 2 25 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SAG

Chloride 10/30/2013 11:51:00 A 1000 mg/L 200 14800 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Iron, dissolved 10/29/2013 7:41:41 P M 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 10/29/2013 7:41:41 P M 0.02 mg/L 1 < 0.02 0 

### INORGANIC METALS SM 3112B Analyst: RXS

Mercury 10/31/2013 9:34:08 A M 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Aluminum 10/29/2013 7:39:06 P M 0.1 mg/L 1 < 0.1 0 Arsenic 10/29/2013 7:39:06 P M 0.02 mg/L 1 < 0.02 0 Beryllium 10/29/2013 7:39:06 P M 0.001 mg/L 1 < 0.001 0.8 Boron 10/31/2013 11:26:49 A 2.50 mg/L 50 368 0 Cadmium 10/29/2013 7:39:06 P M 0.002 mg/L 1 0.002 0 Chromium 10/29/2013 7:39:06 P M 0.01 mg/L 1 < 0.01 0 Copper 10/29/2013 7:39:06 P M 0.01 mg/L 1 < 0.01 0.1 Iron 10/29/2013 7:39:06 P M 0.05 mg/L 1 < 0.05 0 Lead 10/29/2013 7:39:06 P M 0.02 mg/L 1 < 0.02 0.1 Manganese 10/29/2013 7:39:06 P M 0.01 mg/L 1 0.48 0 Nickel 10/29/2013 7:39:06 P M 0.01 mg/L 1 0.01 0 Selenium 10/29/2013 7:39:06 P M 0.02 mg/L 1 < 0.02 3.4 Silver 10/29/2013 7:39:06 P M 0.005 mg/L 1 < 0.005 0.1 Zinc 10/29/2013 7:39:06 P M 0.01 mg/L 1 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 10/30/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: MCO

Oil & Grease 10/31/2013 2:33:00 P M 5 mg/L 1 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 10/28/2013 9:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1310C16
Lab ID: G1310C16-002

DF 

# Geochemical Testing Date: 05-Nov-13

Received Date: 10/28/2013 4:50:00 PM 

# Laboratory Results

Sampled By : Water Lab IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 10/29/2013 2:33:55 P M 100 mg/L 5 27300 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 10/29/2013 2:33:33 P M 100 mg/L 20 5680 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 10/30/2013 6:37:00 A M 3 mg/L 3 < 3 0 

### INORGANIC METALS USGS I-1230-85 Analyst: SEF

Hexavalent Chromium 10/28/2013 5:55:00 P M 0.020 mg/L 1 < 0.020 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SAG

Chloride 10/30/2013 11:51:00 A 1000 mg/L 200 16700 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Iron, dissolved 10/29/2013 7:44:16 P M 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 10/29/2013 7:44:16 P M 0.02 mg/L 1 0.26 0 

### INORGANIC METALS SM 3112B Analyst: RXS

Mercury 10/31/2013 9:35:47 A M 0.100 mg/L 500 0.117 0 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Aluminum 10/29/2013 5:54:20 P M 1.0 mg/L 1 41.2 0 Arsenic 10/29/2013 5:54:20 P M 0.20 mg/L 1 0.23 0 Beryllium 10/29/2013 5:54:20 P M 0.010 mg/L 1 < 0.010 0 Boron 10/31/2013 11:21:42 A 5.00 mg/L 10 483 0 Cadmium 10/29/2013 5:54:20 P M 0.020 mg/L 1 0.042 0 Chromium 10/29/2013 5:54:20 P M 0.10 mg/L 1 0.42 0 Copper 10/29/2013 5:54:20 P M 0.10 mg/L 1 0.50 0 Iron 10/29/2013 5:54:20 P M 0.50 mg/L 1 110 0 Lead 10/29/2013 5:54:20 P M 0.20 mg/L 1 < 0.20 0 Manganese 10/29/2013 5:54:20 P M 0.10 mg/L 1 83.2 0 Nickel 10/29/2013 5:54:20 P M 0.10 mg/L 1 1.71 0 Selenium 10/29/2013 5:54:20 P M 0.20 mg/L 1 1.08 0 Silver 10/29/2013 5:54:20 P M 0.050 mg/L 1 < 0.050 0 Zinc 10/29/2013 5:54:20 P M 0.10 mg/L 1 1.79 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 10/30/2013 0.02 mg/L 1 0.42 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: MCO

Oil & Grease 10/31/2013 2:34:00 P M 18 mg/L 3.57 < 18 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Wednesday, November 13, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 M(a) Order No.: G1311071 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 4 sample(s) on 11/4/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 6

### 13-Nov-13 Date: 

# Geochemical Testing
Project: Keystone 611 M(a) CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1311071 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 6

### Project: Keystone 611 M(a) Client Sample ID: Outfall 101

Collection Date: 11/4/2013 9:30:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1311071
Lab ID: G1311071-001

DF 

# Geochemical Testing Date: 13-Nov-13

Received Date: 11/4/2013 4:28:08 PM 

# Laboratory Results

Sampled By : NRG

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 11/5/2013 2:52:23 PM 1 mg/L 1 1 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 11/5/2013 2:53:16 PM 20 mg/L 1 28300 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 11/6/2013 6:21:00 AM 2 mg/L 1.5 2 25 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: CLS

Chloride 11/5/2013 10:35:00 A M 1000 mg/L 200 16000 

### INORGANIC METALS EPA 200.7 Analyst: JEK

Iron, dissolved 11/6/2013 4:05:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 11/6/2013 4:05:00 PM 0.02 mg/L 1 0.37 0 

### INORGANIC METALS SM 3112B Analyst: RXS

Mercury 11/7/2013 11:49:52 A M 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: JEK

Aluminum 11/8/2013 12:47:08 P M 0.1 mg/L 1 < 0.1 0 Arsenic 11/8/2013 12:47:08 P M 0.02 mg/L 1 < 0.02 0 Beryllium 11/6/2013 4:01:00 PM 0.001 mg/L 1 < 0.001 0.8 Boron 11/6/2013 3:41:25 PM 2.50 mg/L 50 352 0 Cadmium 11/6/2013 4:01:00 PM 0.002 mg/L 1 < 0.002 0 Chromium 11/6/2013 4:01:00 PM 0.01 mg/L 1 < 0.01 0 Copper 11/6/2013 4:01:00 PM 0.01 mg/L 1 < 0.01 0.1 Iron 11/6/2013 4:01:00 PM 0.05 mg/L 1 < 0.05 0 Lead 11/6/2013 4:01:00 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 11/6/2013 4:01:00 PM 0.01 mg/L 1 0.14 0 Nickel 11/6/2013 4:01:00 PM 0.01 mg/L 1 0.01 0 Selenium 11/6/2013 4:01:00 PM 0.02 mg/L 1 0.36 3.4 Silver 11/6/2013 4:01:00 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 11/8/2013 12:47:08 P M 0.01 mg/L 1 0.01 0 Zinc 11/11/2013 1:15:08 P M 0.50 mg/L 50 < 0.50 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 11/12/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: MCO

Oil & Grease 11/5/2013 6:19:00 PM 5 mg/L 1 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 6

### Project: Keystone 611 M(a) Client Sample ID: FGD Influent

Collection Date: 11/4/2013 9:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1311071
Lab ID: G1311071-002

DF 

# Geochemical Testing Date: 13-Nov-13

Received Date: 11/4/2013 4:28:08 PM 

# Laboratory Results

Sampled By : NRG IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 11/5/2013 2:53:15 PM 100 mg/L 5 30800 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 11/5/2013 2:52:25 PM 100 mg/L 20 1670 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 11/6/2013 6:21:00 AM 3 mg/L 3 8 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: CLS

Chloride 11/5/2013 10:35:00 A M 1000 mg/L 200 16000 

### INORGANIC METALS EPA 200.7 Analyst: JEK

Iron, dissolved 11/6/2013 4:10:00 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 11/6/2013 4:10:00 PM 0.02 mg/L 1 0.35 0 

### INORGANIC METALS SM 3112B Analyst: RXS

Mercury 11/7/2013 11:51:29 A M 0.100 mg/L 500 0.106 0 

### INORGANIC METALS EPA 200.7 Analyst: JEK

Aluminum 11/8/2013 11:22:14 P M 1.0 mg/L 1 38.0 0 Arsenic 11/8/2013 11:22:14 P M 0.20 mg/L 1 0.32 0 Beryllium 11/8/2013 11:22:14 P M 0.010 mg/L 1 < 0.010 0 Boron 11/11/2013 3:25:03 P M 5.00 mg/L 10 467 0 Cadmium 11/8/2013 11:22:14 P M 0.020 mg/L 1 0.028 0 Chromium 11/8/2013 11:22:14 P M 0.10 mg/L 1 0.37 0 Copper 11/8/2013 11:22:14 P M 0.10 mg/L 1 0.47 0 Iron 11/8/2013 11:22:14 P M 0.50 mg/L 1 131 0 Lead 11/8/2013 11:22:14 P M 0.20 mg/L 1 < 0.20 0 Manganese 11/8/2013 11:22:14 P M 0.10 mg/L 1 89.2 0 Nickel 11/8/2013 11:22:14 P M 0.10 mg/L 1 1.64 0 Selenium 11/8/2013 11:22:14 P M 0.20 mg/L 1 1.89 0 Silver 11/8/2013 11:22:14 P M 0.050 mg/L 1 < 0.050 0 Zinc 11/8/2013 11:22:14 P M 0.10 mg/L 1 1.51 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 11/12/2013 0.02 mg/L 1 0.35 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: MCO

Oil & Grease 11/5/2013 6:20:00 PM 18 mg/L 3.57 < 18 0

I.D. 56-00306 PA DEP 

# Page 4 of 6

### Project: Keystone 611 M(a) Client Sample ID: Plum Creek

Collection Date: 11/4/2013 7:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1311071
Lab ID: G1311071-003

DF 

# Geochemical Testing Date: 13-Nov-13

Received Date: 11/4/2013 4:28:08 PM 

# Laboratory Results

Sampled By : NRG

MCL
INORGANIC NON METALS SM 4500-CO2D Analyst: MBG

Bicarbonate 11/6/2013 1:02:00 PM 5 mg/L CaCO3 1 54 0 

### INORGANIC NON-METALS SM 4500-CO2 Analyst: MBG

Carbonate 11/6/2013 1:02:00 PM 5 mg/L CaCO3 1 < 5 0 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 11/5/2013 2:53:15 PM 20 mg/L 1 362 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 11/5/2013 2:52:25 PM 10 mg/L 2 < 10 0 

### INORGANIC NON-METALS ASTM D1067-06 Analyst: MBG

Alkalinity to pH 4.5 11/6/2013 1:02:00 PM 5 mg/L CaCO3 1 54 0 

### INORGANIC NON-METALS EPA 300.0 Analyst: MLR

Nitrate Nitrogen 11/4/2013 4:57:00 PM 0.05 mg/L as N 1 0.30 0 Nitrite Nitrogen 11/4/2013 4:57:00 PM 0.05 mg/L as N 1 < 0.05 0 Nitrate - Nitrite 11/4/2013 4:57:00 PM 0.05 mg/L as N 1 0.30 0 

### INORGANIC NON-METALS EPA 300.0 Analyst: MLR

Chloride 11/4/2013 4:57:00 PM 1 mg/L 1 13 0 Fluoride 11/4/2013 4:57:00 PM 0.1 mg/L 1 < 0.1 0 Sulfate 11/4/2013 4:57:00 PM 2 mg/L 1 41 0 

### INORGANIC NON-METALS EPA 350.1 Analyst: SLY

Ammonia Nitrogen - Distilled 11/7/2013 10:25:14 A M 0.10 mg/L as N 1 < 0.10 0 

### INORGANICS NON METALS SM 4500-SIO2 C Analyst: MLR

Silica, total 11/7/2013 5:03:00 PM 0.20 mg/L 1 3.2 0 

### INORGANIC METALS EPA 200.7 Analyst: JEK

Barium 11/6/2013 3:45:00 PM 0.01 mg/L 1 0.05 0 Boron 11/6/2013 2:15:09 PM 0.05 mg/L 1 < 0.05 0 Calcium 11/6/2013 3:45:00 PM 0.1 mg/L 1 22.3 0 Iron 11/6/2013 3:45:00 PM 0.05 mg/L 1 0.38 0 Magnesium 11/6/2013 3:45:00 PM 0.1 mg/L 1 6.8 0 Manganese 11/6/2013 3:45:00 PM 0.01 mg/L 1 0.08 0 Potassium 11/6/2013 3:45:00 PM 0.5 mg/L 1 2.0 0 Sodium 11/6/2013 3:45:00 PM 0.2 mg/L 1 17.4 0 Strontium 11/6/2013 3:45:00 PM 0.01 mg/L 1 0.18 0 

### INDICATOR ORGANIC PARAMETERS SM 20 5310-C Analyst: JDH

Total Organic Carbon 11/6/2013 10:15:00 P M 0.5 mg/L 1 2.0 0

I.D. 56-00306 PA DEP 

# Page 5 of 6

### Project: Keystone 611 M(a) Client Sample ID: Crooked Creek

Collection Date: 11/4/2013 7:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1311071
Lab ID: G1311071-004

DF 

# Geochemical Testing Date: 13-Nov-13

Received Date: 11/4/2013 4:28:08 PM 

# Laboratory Results

Sampled By : NRG

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 11/5/2013 2:53:15 PM 20 mg/L 1 306 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 11/5/2013 2:52:24 PM 5 mg/L 1 18 

### INORGANIC NON-METALS ASTM D1067-06 Analyst: MBG

Alkalinity to pH 4.5 11/6/2013 1:11:00 PM 5 mg/L CaCO3 1 94 0 

### INORGANIC NON-METALS EPA 300.0 Analyst: MLR

Nitrate Nitrogen 11/4/2013 5:47:00 PM 0.05 mg/L as N 1 0.38 0 Nitrite Nitrogen 11/4/2013 5:47:00 PM 0.05 mg/L as N 1 < 0.05 0 Nitrate - Nitrite 11/4/2013 5:47:00 PM 0.05 mg/L as N 1 0.38 0 

### INORGANIC NON-METALS EPA 300.0 Analyst: MLR

Chloride 11/4/2013 5:47:00 PM 1 mg/L 1 49 0 Sulfate 11/4/2013 5:47:00 PM 2 mg/L 1 79 0 

### INORGANICS NON METALS SM 4500-SIO2 C Analyst: MLR

Silica, total 11/7/2013 5:03:00 PM 0.20 mg/L 1 4.1 0 

### INORGANIC METALS EPA 200.7 Analyst: JEK

Calcium 11/6/2013 3:49:00 PM 0.1 mg/L 1 35.1 0 Iron 11/6/2013 3:49:00 PM 0.05 mg/L 1 1.45 0 Magnesium 11/6/2013 3:49:00 PM 0.1 mg/L 1 9.2 0 Manganese 11/6/2013 3:49:00 PM 0.01 mg/L 1 0.26 0 Potassium 11/6/2013 3:49:00 PM 0.5 mg/L 1 2.6 0 Sodium 11/6/2013 3:49:00 PM 0.2 mg/L 1 59.7 0 

### INDICATOR ORGANIC PARAMETERS SM 20 5310-C Analyst: JDH

Total Organic Carbon 11/7/2013 7:30:00 PM 0.5 mg/L 1 2.4 0

I.D. 56-00306 PA DEP 

# Page 6 of 6

# Monday, November 25, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 M(b) Order No.: G1311429 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 11/11/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 25-Nov-13 Date: 

# Geochemical Testing
Project: Keystone 611 M(b) CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1311429 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 M(b) Client Sample ID: Outfall 101

Collection Date: 11/11/2013 9:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1311429
Lab ID: G1311429-001

DF 

# Geochemical Testing Date: 25-Nov-13

Received Date: 11/11/2013 4:51:24 PM 

# Laboratory Results

Sampled By : NRG

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 11/12/2013 1:25:34 P M 1 mg/L 1 5 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 11/12/2013 1:25:06 P M 20 mg/L 1 24400 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 11/13/2013 6:30:00 A M 2 mg/L 1.5 < 2 25 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: CLS

Chloride 11/13/2013 1:08:00 P M 1000 mg/L 200 14800 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Iron, dissolved 11/13/2013 4:44:23 P M 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 11/13/2013 4:44:23 P M 0.02 mg/L 1 < 0.02 0 

### INORGANIC METALS SM 3112B Analyst: RXS

Mercury 11/14/2013 11:43:02 A 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Aluminum 11/13/2013 4:41:49 P M 0.1 mg/L 1 < 0.1 0 Arsenic 11/13/2013 4:41:49 P M 0.02 mg/L 1 < 0.02 0 Beryllium 11/13/2013 4:41:49 P M 0.001 mg/L 1 < 0.001 0.8 Boron 11/14/2013 11:16:58 A 2.50 mg/L 50 343 0 Cadmium 11/13/2013 4:41:49 P M 0.002 mg/L 1 0.002 0 Chromium 11/13/2013 4:41:49 P M 0.01 mg/L 1 < 0.01 0 Copper 11/13/2013 4:41:49 P M 0.01 mg/L 1 < 0.01 0.1 Iron 11/13/2013 4:41:49 P M 0.05 mg/L 1 < 0.05 0 Lead 11/13/2013 4:41:49 P M 0.02 mg/L 1 < 0.02 0.1 Manganese 11/13/2013 4:41:49 P M 0.01 mg/L 1 4.82 0 Nickel 11/13/2013 4:41:49 P M 0.01 mg/L 1 0.01 0 Selenium 11/13/2013 4:41:49 P M 0.02 mg/L 1 < 0.02 3.4 Silver 11/13/2013 4:41:49 P M 0.005 mg/L 1 < 0.005 0.1 Zinc 11/14/2013 11:19:32 A 0.01 mg/L 1 0.06 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 11/18/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: MCO

Oil & Grease 11/18/2013 4:08:00 P M 5 mg/L 1.01 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 M(b) Client Sample ID: FGD Influent

Collection Date: 11/11/2013 9:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1311429
Lab ID: G1311429-002

DF 

# Geochemical Testing Date: 25-Nov-13

Received Date: 11/11/2013 4:51:24 PM 

# Laboratory Results

Sampled By : NRG IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 11/12/2013 1:25:06 P M 100 mg/L 5 25100 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 11/12/2013 1:25:34 P M 100 mg/L 20 4580 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 11/13/2013 6:30:00 A M 3 mg/L 3 11 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: CLS

Chloride 11/13/2013 1:08:00 P M 1000 mg/L 200 15700 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Iron, dissolved 11/13/2013 4:46:57 P M 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 11/13/2013 4:46:57 P M 0.02 mg/L 1 < 0.02 0 

### INORGANIC METALS SM 3112B Analyst: RXS

Mercury 11/14/2013 11:44:38 A 0.100 mg/L 500 0.414 0 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Aluminum 11/18/2013 9:13:00 P M 1.0 mg/L 1 145 0 Arsenic 11/18/2013 9:13:00 P M 0.20 mg/L 1 1.12 0 Beryllium 11/18/2013 9:13:00 P M 0.010 mg/L 1 0.018 0 Boron 11/21/2013 3:41:58 P M 5.00 mg/L 10 427 0 Cadmium 11/18/2013 9:13:00 P M 0.020 mg/L 1 0.026 0 Chromium 11/18/2013 9:13:00 P M 0.10 mg/L 1 1.42 0 Copper 11/18/2013 9:13:00 P M 0.10 mg/L 1 0.98 0 Iron 11/18/2013 9:13:00 P M 0.50 mg/L 1 552 0 Lead 11/18/2013 9:13:00 P M 0.20 mg/L 1 0.45 0 Manganese 11/18/2013 9:13:00 P M 0.10 mg/L 1 108 0 Nickel 11/18/2013 9:13:00 P M 0.10 mg/L 1 2.56 0 Selenium 11/18/2013 9:13:00 P M 0.20 mg/L 1 3.12 0 Silver 11/18/2013 9:13:00 P M 0.050 mg/L 1 < 0.050 0 Zinc 11/18/2013 9:13:00 P M 0.10 mg/L 1 3.79 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 11/19/2013 0.02 mg/L 1 1.42 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: MCO

Oil & Grease 11/18/2013 4:08:00 P M 18 mg/L 3.57 < 18 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Tuesday, November 26, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1311722 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 11/18/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 26-Nov-13 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1311722 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 11/18/2013 9:30:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1311722
Lab ID: G1311722-001

DF 

# Geochemical Testing Date: 26-Nov-13

Received Date: 11/18/2013 5:55:31 PM 

# Laboratory Results

Sampled By : NRG

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 11/19/2013 1:55:51 P M 1 mg/L 1 6 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 11/19/2013 1:53:43 P M 100 mg/L 5 22300 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 11/20/2013 6:42:00 A M 2 mg/L 1.5 < 2 25 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 11/20/2013 12:54:00 P 1000 mg/L 200 14400 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Iron, dissolved 11/21/2013 12:03:07 A 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 11/21/2013 12:03:07 A 0.02 mg/L 1 < 0.02 0 

### INORGANIC METALS SM 3112B Analyst: RXS

Mercury 11/19/2013 3:10:53 P M 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Aluminum 11/21/2013 12:00:30 A 0.1 mg/L 1 < 0.1 0 Arsenic 11/21/2013 12:00:30 A 0.02 mg/L 1 < 0.02 0 Beryllium 11/21/2013 12:00:30 A 0.001 mg/L 1 < 0.001 0.8 Boron 11/21/2013 3:14:03 P M 2.50 mg/L 50 347 0 Cadmium 11/21/2013 12:00:30 A 0.002 mg/L 1 < 0.002 0 Chromium 11/21/2013 12:00:30 A 0.01 mg/L 1 < 0.01 0 Copper 11/21/2013 12:00:30 A 0.01 mg/L 1 < 0.01 0.1 Iron 11/21/2013 12:00:30 A 0.05 mg/L 1 < 0.05 0 Lead 11/21/2013 12:00:30 A 0.02 mg/L 1 < 0.02 0.1 Manganese 11/21/2013 12:00:30 A 0.01 mg/L 1 0.51 0 Nickel 11/21/2013 12:00:30 A 0.01 mg/L 1 < 0.01 0 Selenium 11/21/2013 12:00:30 A 0.02 mg/L 1 < 0.02 3.4 Silver 11/21/2013 12:00:30 A 0.005 mg/L 1 < 0.005 0.1 Zinc 11/21/2013 12:00:30 A 0.01 mg/L 1 0.02 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 11/22/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: MCO

Oil & Grease 11/21/2013 2:54:00 P M 5 mg/L 1.02 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 11/18/2013 9:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1311722
Lab ID: G1311722-002

DF 

# Geochemical Testing Date: 26-Nov-13

Received Date: 11/18/2013 5:55:31 PM 

# Laboratory Results

Sampled By : NRG IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 11/19/2013 1:53:43 P M 100 mg/L 5 23200 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 11/19/2013 1:55:49 P M 100 mg/L 20 9890 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 11/20/2013 6:42:00 A M 3 mg/L 3 5 0 

### INORGANIC METALS USGS I-1230-85 Analyst: HJC

Hexavalent Chromium 11/18/2013 7:00:00 P M 0.020 mg/L 1 < 0.020 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 11/20/2013 12:54:00 P 1000 mg/L 200 15700 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Iron, dissolved 11/21/2013 12:05:43 A 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 11/21/2013 12:05:43 A 0.02 mg/L 1 0.04 0 

### INORGANIC METALS SM 3112B Analyst: RXS

Mercury 11/19/2013 3:15:52 P M 0.100 mg/L 500 0.520 0 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Aluminum 11/19/2013 10:32:00 P 1.0 mg/L 1 208 0 Arsenic 11/19/2013 10:32:00 P 0.20 mg/L 1 1.55 0 Beryllium 11/19/2013 10:32:00 P 0.010 mg/L 1 0.024 0 Boron 11/20/2013 8:24:58 P M 5.00 mg/L 10 460 0 Cadmium 11/19/2013 10:32:00 P 0.020 mg/L 1 0.025 0 Chromium 11/19/2013 10:32:00 P 0.10 mg/L 1 2.09 0 Copper 11/19/2013 10:32:00 P 0.10 mg/L 1 1.51 0 Iron 11/19/2013 10:32:00 P 0.50 mg/L 1 780 0 Lead 11/19/2013 10:32:00 P 0.20 mg/L 1 0.55 0 Manganese 11/19/2013 10:32:00 P 0.10 mg/L 1 104 0 Nickel 11/19/2013 10:32:00 P 0.10 mg/L 1 3.07 0 Selenium 11/19/2013 10:32:00 P 0.20 mg/L 1 4.01 0 Silver 11/19/2013 10:32:00 P 0.050 mg/L 1 < 0.050 0 Zinc 11/19/2013 10:32:00 P 0.10 mg/L 1 3.85 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 11/22/2013 0.02 mg/L 1 2.09 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: MCO

Oil & Grease 11/21/2013 2:54:00 P M 19 mg/L 3.7 < 19 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Monday, December 09, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1311A79 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 11/25/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 09-Dec-13 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1311A79 

# CASE NARRATIVE

Samples were not filtered in the field for dissolved metals; samples were lab filtered. No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 11/25/2013 9:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1311A79
Lab ID: G1311A79-001

DF 

# Geochemical Testing Date: 09-Dec-13

Received Date: 11/25/2013 5:00:32 PM 

# Laboratory Results

Sampled By : NRG

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 11/26/2013 3:08:49 P M 1 mg/L 1 1 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 11/26/2013 3:08:18 P M 20 mg/L 1 25700 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 11/27/2013 6:13:00 A M 2 mg/L 1.5 < 2 25 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: CLS

Chloride 11/29/2013 8:04:00 A M 1000 mg/L 200 15300 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Iron, dissolved 12/3/2013 5:24:20 PM 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 12/3/2013 5:24:20 PM 0.02 mg/L 1 < 0.02 0 

### INORGANIC METALS SM 3112B Analyst: RXS

Mercury 12/3/2013 9:06:15 AM 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Aluminum 12/3/2013 5:21:45 PM 0.1 mg/L 1 < 0.1 0 Arsenic 12/3/2013 5:21:45 PM 0.02 mg/L 1 < 0.02 0 Beryllium 12/3/2013 5:21:45 PM 0.001 mg/L 1 < 0.001 0.8 Boron 12/4/2013 2:55:02 PM 2.50 mg/L 50 336 0 Cadmium 12/3/2013 5:21:45 PM 0.002 mg/L 1 < 0.002 0 Chromium 12/3/2013 5:21:45 PM 0.01 mg/L 1 < 0.01 0 Copper 12/4/2013 3:29:00 PM 0.01 mg/L 1 < 0.01 0.1 Iron 12/3/2013 5:21:45 PM 0.05 mg/L 1 < 0.05 0 Lead 12/3/2013 5:21:45 PM 0.02 mg/L 1 < 0.02 0.1 Manganese 12/3/2013 5:21:45 PM 0.01 mg/L 1 1.42 0 Nickel 12/3/2013 5:21:45 PM 0.01 mg/L 1 < 0.01 0 Selenium 12/3/2013 5:21:45 PM 0.02 mg/L 1 < 0.02 3.4 Silver 12/3/2013 5:21:45 PM 0.005 mg/L 1 < 0.005 0.1 Zinc 12/3/2013 5:21:45 PM 0.01 mg/L 1 0.02 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 12/4/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: MCO

Oil & Grease 11/29/2013 5:48:00 P M 5 mg/L 1.02 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 11/25/2013 9:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1311A79
Lab ID: G1311A79-002

DF 

# Geochemical Testing Date: 09-Dec-13

Received Date: 11/25/2013 5:00:32 PM 

# Laboratory Results

Sampled By : NRG IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 11/26/2013 3:08:18 P M 100 mg/L 5 23500 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 11/26/2013 3:08:50 P M 100 mg/L 20 9920 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 11/27/2013 6:13:00 A M 3 mg/L 3 7 0 

### INORGANIC METALS USGS I-1230-85 Analyst: SEF

Hexavalent Chromium 11/25/2013 5:47:00 P M 0.020 mg/L 1 < 0.020 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: CLS

Chloride 11/29/2013 8:04:00 A M 1000 mg/L 200 15100 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Iron, dissolved 12/5/2013 11:38:17 A M 0.10 mg/L 2 < 0.10 0 Selenium, dissolved 12/5/2013 11:38:17 A M 0.04 mg/L 2 0.38 0 

### INORGANIC METALS SM 3112B Analyst: RXS

Mercury 12/3/2013 9:07:53 AM 0.100 mg/L 500 0.590 0 

### INORGANIC METALS EPA 200.7 Analyst: JEK

Aluminum 11/29/2013 4:48:48 P M 1.0 mg/L 1 194 0 Arsenic 11/29/2013 4:48:48 P M 0.20 mg/L 1 1.37 0 Beryllium 11/29/2013 4:48:48 P M 0.010 mg/L 1 0.020 0 Boron 11/29/2013 4:48:48 P M 0.50 mg/L 1 427 0 Cadmium 11/29/2013 4:48:48 P M 0.020 mg/L 1 0.021 0 Chromium 11/29/2013 4:48:48 P M 0.10 mg/L 1 1.52 0 Copper 11/29/2013 4:48:48 P M 0.10 mg/L 1 1.29 0 Iron 11/29/2013 4:48:48 P M 0.50 mg/L 1 720 0 Lead 11/29/2013 4:48:48 P M 0.20 mg/L 1 0.51 0 Manganese 11/29/2013 4:48:48 P M 0.10 mg/L 1 118 0 Nickel 11/29/2013 4:48:48 P M 0.10 mg/L 1 2.16 0 Selenium 11/29/2013 4:48:48 P M 0.20 mg/L 1 3.06 0 Silver 11/29/2013 4:48:48 P M 0.050 mg/L 1 < 0.050 0 Zinc 11/29/2013 4:48:48 P M 0.10 mg/L 1 3.07 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 12/3/2013 0.02 mg/L 1 1.52 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: MCO

Oil & Grease 11/29/2013 5:49:00 P M 18 mg/L 3.57 < 18 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Thursday, December 12, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 M(a) Order No.: G1312017 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 12/2/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 12-Dec-13 Date: 

# Geochemical Testing
Project: Keystone 611 M(a) CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1312017 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 M(a) Client Sample ID: Outfall 101

Collection Date: 12/2/2013 10:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1312017
Lab ID: G1312017-001

DF 

# Geochemical Testing Date: 12-Dec-13

Received Date: 12/2/2013 4:28:57 PM 

# Laboratory Results

Sampled By : NRG

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 12/3/2013 1:55:20 PM 1 mg/L 1 8 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 12/3/2013 1:55:01 PM 20 mg/L 1 23700 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 12/4/2013 7:45:00 AM 2 mg/L 1.5 14 25 NOTES: J - Estimated value. The associated QC criteria were not satisfied for this analyte, the data may be biased high. 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 12/4/2013 9:28:00 AM 1000 mg/L 200 14700 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Iron, dissolved 12/5/2013 7:02:32 PM 0.10 mg/L 2 < 0.10 0 Selenium, dissolved 12/5/2013 7:02:32 PM 0.04 mg/L 2 0.46 0 

### INORGANIC METALS SM 3112B Analyst: RXS

Mercury 12/9/2013 10:22:57 A M 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Aluminum 12/5/2013 6:59:56 PM 0.2 mg/L 2 < 0.2 0 Arsenic 12/5/2013 6:59:56 PM 0.04 mg/L 2 < 0.04 0 Beryllium 12/5/2013 6:59:56 PM 0.002 mg/L 2 < 0.002 0.8 Boron 12/6/2013 1:29:08 PM 5.00 mg/L 100 324 0 Cadmium 12/5/2013 6:59:56 PM 0.004 mg/L 2 < 0.004 0 Chromium 12/5/2013 6:59:56 PM 0.02 mg/L 2 < 0.02 0 Copper 12/5/2013 6:59:56 PM 0.02 mg/L 2 < 0.02 0.1 Iron 12/5/2013 6:59:56 PM 0.10 mg/L 2 < 0.10 0 Lead 12/5/2013 6:59:56 PM 0.04 mg/L 2 < 0.04 0.1 Manganese 12/5/2013 6:59:56 PM 0.02 mg/L 2 2.68 0 Nickel 12/5/2013 6:59:56 PM 0.02 mg/L 2 < 0.02 0 Selenium 12/5/2013 6:59:56 PM 0.04 mg/L 2 0.45 3.4 Silver 12/5/2013 6:59:56 PM 0.010 mg/L 2 < 0.010 0.1 Zinc 12/5/2013 6:59:56 PM 0.02 mg/L 2 < 0.02 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 12/6/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: MCO

Oil & Grease 12/5/2013 2:21:00 PM 5 mg/L 1 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 M(a) Client Sample ID: FGD Influent

Collection Date: 12/2/2013 10:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1312017
Lab ID: G1312017-002

DF 

# Geochemical Testing Date: 12-Dec-13

Received Date: 12/2/2013 4:28:57 PM 

# Laboratory Results

Sampled By : NRG IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 12/3/2013 1:55:01 PM 100 mg/L 5 24000 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 12/3/2013 1:55:19 PM 200 mg/L 40 27500 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 12/4/2013 7:45:00 AM 3 mg/L 3 18 0 NOTES: J - Estimated value. The associated QC criteria were not satisfied for this analyte, the data may be biased high. 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 12/4/2013 9:28:00 AM 1000 mg/L 200 12600 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Iron, dissolved 12/5/2013 10:27:45 P M 0.10 mg/L 2 < 0.10 0 Selenium, dissolved 12/5/2013 10:27:45 P M 0.04 mg/L 2 0.31 0 

### INORGANIC METALS SM 3112B Analyst: RXS

Mercury 12/9/2013 10:24:35 A M 0.100 mg/L 500 0.650 0 

### INORGANIC METALS EPA 200.7 Analyst: JEK

Aluminum 12/10/2013 9:30:37 P M 1.0 mg/L 1 247 0 Arsenic 12/10/2013 9:30:37 P M 0.20 mg/L 1 1.23 0 Beryllium 12/10/2013 9:30:37 P M 0.010 mg/L 1 0.024 0 Boron 12/11/2013 2:08:06 P M 5.00 mg/L 10 386 0 Cadmium 12/10/2013 9:30:37 P M 0.020 mg/L 1 < 0.020 0 Chromium 12/10/2013 9:30:37 P M 0.10 mg/L 1 2.20 0 Copper 12/10/2013 9:30:37 P M 0.10 mg/L 1 1.43 0 Iron 12/10/2013 9:30:37 P M 0.50 mg/L 1 1060 0 Lead 12/10/2013 9:30:37 P M 0.20 mg/L 1 0.64 0 Manganese 12/10/2013 9:30:37 P M 0.10 mg/L 1 136 0 Nickel 12/10/2013 9:30:37 P M 0.10 mg/L 1 2.68 0 Selenium 12/10/2013 9:30:37 P M 0.20 mg/L 1 3.39 0 Silver 12/10/2013 9:30:37 P M 0.050 mg/L 1 < 0.050 0 Zinc 12/10/2013 9:30:37 P M 0.10 mg/L 1 3.16 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 12/11/2013 0.02 mg/L 1 2.20 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: MCO

Oil & Grease 12/5/2013 2:22:00 PM 19 mg/L 3.7 < 19 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Monday, December 23, 2013

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 M(b) Order No.: G1312344 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 3 sample(s) on 12/9/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 5

### 23-Dec-13 Date: 

# Geochemical Testing
Project: Keystone 611 M(b) CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1312344 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 5

### Project: Keystone 611 M(b) Client Sample ID: Outfall 101

Collection Date: 12/9/2013 9:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1312344
Lab ID: G1312344-001

DF 

# Geochemical Testing Date: 23-Dec-13

Received Date: 12/9/2013 4:24:37 PM 

# Laboratory Results

Sampled By : NRG

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 12/10/2013 1:52:08 P M 1 mg/L 1 7 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 12/10/2013 1:52:50 P M 20 mg/L 1 27700 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 12/11/2013 6:37:00 A M 2 mg/L 1.5 2 25 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: CLS

Chloride 12/10/2013 1:22:00 P M 1000 mg/L 200 15600 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Iron, dissolved 12/11/2013 11:28:09 P 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 12/11/2013 11:28:09 P 0.02 mg/L 1 0.19 0 

### INORGANIC METALS SM 3112B Analyst: RXS

Mercury 12/12/2013 9:47:41 A M 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Aluminum 12/11/2013 11:25:33 P 0.1 mg/L 1 < 0.1 0 Arsenic 12/11/2013 11:25:33 P 0.02 mg/L 1 < 0.02 0 Beryllium 12/11/2013 11:25:33 P 0.001 mg/L 1 < 0.001 0.8 Boron 12/17/2013 4:12:41 P M 2.50 mg/L 50 337 0 Cadmium 12/11/2013 11:25:33 P 0.002 mg/L 1 < 0.002 0 Chromium 12/11/2013 11:25:33 P 0.01 mg/L 1 < 0.01 0 Copper 12/11/2013 11:25:33 P 0.01 mg/L 1 < 0.01 0.1 Iron 12/11/2013 11:25:33 P 0.05 mg/L 1 < 0.05 0 Lead 12/11/2013 11:25:33 P 0.02 mg/L 1 < 0.02 0.1 Manganese 12/11/2013 11:25:33 P 0.01 mg/L 1 2.20 0 Nickel 12/11/2013 11:25:33 P 0.01 mg/L 1 < 0.01 0 Selenium 12/11/2013 11:25:33 P 0.02 mg/L 1 0.21 3.4 Silver 12/11/2013 11:25:33 P 0.005 mg/L 1 < 0.005 0.1 Zinc 12/11/2013 11:25:33 P 0.01 mg/L 1 < 0.01 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 12/12/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: MCO

Oil & Grease 12/16/2013 5:42:00 P M 5 mg/L 1.02 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 5

### Project: Keystone 611 M(b) Client Sample ID: FGD Influent

Collection Date: 12/9/2013 9:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1312344
Lab ID: G1312344-002

DF 

# Geochemical Testing Date: 23-Dec-13

Received Date: 12/9/2013 4:24:37 PM 

# Laboratory Results

Sampled By : NRG IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 12/10/2013 1:52:50 P M 100 mg/L 5 22600 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 12/10/2013 1:52:09 P M 100 mg/L 20 11500 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 12/11/2013 6:37:00 A M 2 mg/L 1.5 5 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: CLS

Chloride 12/10/2013 1:22:00 P M 1000 mg/L 200 16200 

### INORGANIC METALS EPA 200.7 Analyst: JEK

Iron, dissolved 12/12/2013 9:05:11 P M 0.10 mg/L 2 < 0.10 0 Selenium, dissolved 12/12/2013 9:05:11 P M 0.04 mg/L 2 0.56 0 

### INORGANIC METALS SM 3112B Analyst: RXS

Mercury 12/12/2013 9:52:39 A M 0.100 mg/L 500 0.288 0 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Aluminum 12/11/2013 4:19:16 P M 1.0 mg/L 1 185 0 Arsenic 12/11/2013 4:19:16 P M 0.20 mg/L 1 1.09 0 Beryllium 12/11/2013 4:19:16 P M 0.010 mg/L 1 0.015 0 Boron 12/12/2013 1:06:54 P M 5.00 mg/L 10 474 0 Cadmium 12/11/2013 4:19:16 P M 0.020 mg/L 1 < 0.020 0 Chromium 12/11/2013 4:19:16 P M 0.10 mg/L 1 1.25 0 Copper 12/11/2013 4:19:16 P M 0.10 mg/L 1 0.94 0 Iron 12/11/2013 4:19:16 P M 0.50 mg/L 1 634 0 Lead 12/11/2013 4:19:16 P M 0.20 mg/L 1 0.47 0 Manganese 12/11/2013 4:19:16 P M 0.10 mg/L 1 141 0 Nickel 12/11/2013 4:19:16 P M 0.10 mg/L 1 2.01 0 Selenium 12/11/2013 4:19:16 P M 0.20 mg/L 1 2.34 0 Silver 12/11/2013 4:19:16 P M 0.050 mg/L 1 < 0.050 0 Zinc 12/11/2013 4:19:16 P M 0.10 mg/L 1 2.16 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 12/12/2013 0.02 mg/L 1 1.25 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: MCO

Oil & Grease 12/17/2013 4:55:00 P M 19 mg/L 3.7 < 19 0

I.D. 56-00306 PA DEP 

# Page 4 of 5

### Project: Keystone 611 M(b) Client Sample ID: Outfall 106

Collection Date: 12/9/2013 9:30:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1312344
Lab ID: G1312344-003

DF 

# Geochemical Testing Date: 23-Dec-13

Received Date: 12/9/2013 4:24:37 PM 

# Laboratory Results

Sampled By : NRG

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 12/10/2013 1:52:11 P M 5 mg/L 1 < 5 30 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Aluminum 12/11/2013 11:35:56 P 0.1 mg/L 1 0.1 0 Chromium 12/11/2013 11:35:56 P 0.01 mg/L 1 < 0.01 0 Iron 12/11/2013 11:35:56 P 0.05 mg/L 1 0.24 0 Manganese 12/11/2013 11:35:56 P 0.01 mg/L 1 0.07 0 Nickel 12/11/2013 11:35:56 P 0.01 mg/L 1 < 0.01 0 Titanium 12/11/2013 11:35:56 P 0.005 mg/L 1 0.006 0 Zinc 12/11/2013 11:35:56 P 0.01 mg/L 1 0.01 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: MCO

Oil & Grease 12/17/2013 4:56:00 P M 5 mg/L 1.01 < 5 15

I.D. 56-00306 PA DEP 

# Page 5 of 5

# Friday, January03, 2014

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 Q(b) Order No.: G1312669 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 12/16/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 03-Jan-14 Date: 

# Geochemical Testing
Project: Keystone 611 Q(b) CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1312669 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 Q(b) Client Sample ID: Outfall 101

Collection Date: 12/16/2013 9:30:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1312669
Lab ID: G1312669-001

DF 

# Geochemical Testing Date: 03-Jan-14

Received Date: 12/16/2013 4:30:03 PM 

# Laboratory Results

Sampled By : NRG

MCL
PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 12/17/2013 1:07:19 P M 1 mg/L 1 1 10 

### INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 12/17/2013 1:06:44 P M 20 mg/L 1 24300 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 12/18/2013 7:42:00 A M 2 mg/L 1.5 < 2 25 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: CLS

Chloride 12/17/2013 11:48:00 A 1000 mg/L 200 14200 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Iron, dissolved 12/17/2013 8:37:47 P M 0.10 mg/L 2 < 0.10 0 Selenium, dissolved 12/17/2013 8:37:47 P M 0.04 mg/L 2 < 0.04 0 

### INORGANIC METALS SM 3112B Analyst: RXS

Mercury 12/17/2013 12:25:43 P 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Aluminum 12/17/2013 8:35:11 P M 0.2 mg/L 2 < 0.2 0 Arsenic 12/17/2013 8:35:11 P M 0.04 mg/L 2 < 0.04 0 Beryllium 12/17/2013 8:35:11 P M 0.002 mg/L 2 < 0.002 0.8 Boron 12/18/2013 1:19:00 P M 5.00 mg/L 100 347 0 Cadmium 12/17/2013 8:35:11 P M 0.004 mg/L 2 < 0.004 0 Chromium 12/17/2013 8:35:11 P M 0.02 mg/L 2 < 0.02 0 Copper 12/17/2013 8:35:11 P M 0.02 mg/L 2 < 0.02 0.1 Iron 12/17/2013 8:35:11 P M 0.10 mg/L 2 < 0.10 0 Lead 12/17/2013 8:35:11 P M 0.04 mg/L 2 < 0.04 0.1 Manganese 12/17/2013 8:35:11 P M 0.02 mg/L 2 5.47 0 Nickel 12/17/2013 8:35:11 P M 0.02 mg/L 2 < 0.02 0 Selenium 12/17/2013 8:35:11 P M 0.04 mg/L 2 < 0.04 3.4 Silver 12/17/2013 8:35:11 P M 0.010 mg/L 2 < 0.010 0.1 Zinc 12/17/2013 8:35:11 P M 0.02 mg/L 2 < 0.02 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 12/19/2013 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 12/24/2013 12:18:00 P 5 mg/L 1 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 Q(b) Client Sample ID: FGD Influent

Collection Date: 12/16/2013 9:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1312669
Lab ID: G1312669-002

DF 

# Geochemical Testing Date: 03-Jan-14

Received Date: 12/16/2013 4:30:03 PM 

# Laboratory Results

Sampled By : NRG IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: KLS

Total dissolved solids 12/17/2013 1:06:43 P M 100 mg/L 5 24600 0 

### PHYSICAL TESTS SM 2540D Analyst: KLS

Total suspended solids 12/17/2013 1:07:20 P M 100 mg/L 20 12700 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 12/18/2013 7:42:00 A M 3 mg/L 3 11 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: CLS

Chloride 12/17/2013 11:48:00 A 1000 mg/L 200 16000 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Iron, dissolved 12/17/2013 8:40:23 P M 0.10 mg/L 2 < 0.10 0 Selenium, dissolved 12/17/2013 8:40:23 P M 0.04 mg/L 2 0.38 0 

### INORGANIC METALS SM 3112B Analyst: RXS

Mercury 12/17/2013 12:30:39 P 0.100 mg/L 500 0.735 0 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Aluminum 12/19/2013 9:32:17 P M 1.0 mg/L 1 361 0 Arsenic 12/19/2013 9:32:17 P M 0.20 mg/L 1 2.25 0 Beryllium 12/19/2013 9:32:17 P M 0.010 mg/L 1 0.034 0 Boron 12/20/2013 4:56:02 P M 5.00 mg/L 10 455 0 Cadmium 12/19/2013 9:32:17 P M 0.020 mg/L 1 0.032 0 Chromium 12/19/2013 9:32:17 P M 0.10 mg/L 1 2.66 0 Copper 12/19/2013 9:32:17 P M 0.10 mg/L 1 2.06 0 Iron 12/19/2013 9:32:17 P M 0.50 mg/L 1 1320 0 Lead 12/19/2013 9:32:17 P M 0.20 mg/L 1 0.87 0 Manganese 12/19/2013 9:32:17 P M 0.10 mg/L 1 153 0 Nickel 12/19/2013 9:32:17 P M 0.10 mg/L 1 3.03 0 Selenium 12/19/2013 9:32:17 P M 0.20 mg/L 1 4.23 0 Silver 12/19/2013 9:32:17 P M 0.050 mg/L 1 < 0.050 0 Zinc 12/19/2013 9:32:17 P M 0.10 mg/L 1 4.32 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 1/4/2014 0.02 mg/L 1 2.66 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: NEL

Oil & Grease 12/24/2013 12:19:00 P 18 mg/L 3.57 < 18 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Tuesday, January07, 2014

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 W Order No.: G1312986 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 12/23/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 07-Jan-14 Date: 

# Geochemical Testing
Project: Keystone 611 W CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1312986 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 W Client Sample ID: Outfall 101

Collection Date: 12/23/2013 9:15:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1312986
Lab ID: G1312986-001

DF 

# Geochemical Testing Date: 07-Jan-14

Received Date: 12/23/2013 6:03:05 PM 

# Laboratory Results

Sampled By : NRG

MCL
PHYSICAL TESTS SM 2540D Analyst: GMG

Total suspended solids 12/24/2013 2:43:47 P M 1 mg/L 1 1 10 

### INORGANIC NON-METALS SM 2540 C Analyst: GMG

Total dissolved solids 12/24/2013 2:45:53 P M 20 mg/L 1 25600 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: HJC

BOD 5-day 12/24/2013 11:15:00 A 2 mg/L 1.5 < 2 25 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 12/30/2013 2:41:00 P M 1000 mg/L 200 12600 

### INORGANIC METALS EPA 200.7 Analyst: JEK

Iron, dissolved 12/30/2013 5:48:01 P M 0.05 mg/L 1 < 0.05 0 Selenium, dissolved 12/30/2013 5:48:01 P M 0.02 mg/L 1 < 0.02 0 

### INORGANIC METALS SM 3112B Analyst: RXS

Mercury 12/31/2013 12:23:20 P 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: JEK

Aluminum 12/30/2013 5:45:26 P M 0.2 mg/L 2 < 0.2 0 Arsenic 12/30/2013 5:45:26 P M 0.04 mg/L 2 < 0.04 0 Beryllium 12/30/2013 5:45:26 P M 0.002 mg/L 2 < 0.002 0.8 Boron 12/31/2013 5:47:19 P M 5.00 mg/L 100 286 0 Cadmium 1/6/2014 9:07:00 AM 0.004 mg/L 2 < 0.004 0 Chromium 12/30/2013 5:45:26 P M 0.02 mg/L 2 < 0.02 0 Copper 12/30/2013 5:45:26 P M 0.02 mg/L 2 < 0.02 0.1 Iron 12/30/2013 5:45:26 P M 0.10 mg/L 2 < 0.10 0 Lead 12/30/2013 5:45:26 P M 0.04 mg/L 2 < 0.04 0.1 Manganese 12/30/2013 5:45:26 P M 0.02 mg/L 2 1.78 0 Nickel 12/30/2013 5:45:26 P M 0.02 mg/L 2 < 0.02 0 Selenium 12/30/2013 5:45:26 P M 0.04 mg/L 2 < 0.04 3.4 Silver 12/30/2013 5:45:26 P M 0.010 mg/L 2 < 0.010 0.1 Zinc 12/30/2013 5:45:26 P M 0.02 mg/L 2 0.03 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 1/4/2014 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: MCO

Oil & Grease 12/30/2013 5:57:00 P M 5 mg/L 1.01 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 W Client Sample ID: FGD Influent

Collection Date: 12/23/2013 9:00:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1312986
Lab ID: G1312986-002

DF 

# Geochemical Testing Date: 07-Jan-14

Received Date: 12/23/2013 6:03:05 PM 

# Laboratory Results

Sampled By : NRG IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: GMG

Total dissolved solids 12/24/2013 2:45:54 P M 100 mg/L 5 26800 0 

### PHYSICAL TESTS SM 2540D Analyst: GMG

Total suspended solids 12/24/2013 2:43:46 P M 200 mg/L 40 2800 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: HJC

BOD 5-day 12/24/2013 11:15:00 A 2 mg/L 1.5 4 0 

### INORGANIC METALS USGS I-1230-85 Analyst: SAG

Hexavalent Chromium 12/23/2013 6:48:00 P M 0.020 mg/L 1 < 0.020 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 12/30/2013 2:41:00 P M 1000 mg/L 200 14000 

### INORGANIC METALS EPA 200.7 Analyst: JEK

Iron, dissolved 12/30/2013 5:50:36 P M 0.10 mg/L 2 < 0.10 0 Selenium, dissolved 12/30/2013 5:50:36 P M 0.04 mg/L 2 0.49 0 

### INORGANIC METALS SM 3112B Analyst: RXS

Mercury 12/31/2013 12:24:56 P 0.100 mg/L 500 0.126 0 

### INORGANIC METALS EPA 200.7 Analyst: JEK

Aluminum 12/26/2013 8:21:06 P M 1.0 mg/L 1 74.9 0 Arsenic 12/26/2013 8:21:06 P M 0.20 mg/L 1 0.41 0 Beryllium 12/26/2013 8:21:06 P M 0.010 mg/L 1 < 0.010 0 Boron 12/26/2013 8:21:06 P M 0.50 mg/L 1 400 0 Cadmium 12/30/2013 10:26:31 A 0.020 mg/L 1 0.031 0 Chromium 12/26/2013 8:21:06 P M 0.10 mg/L 1 0.43 0 Copper 12/26/2013 8:21:06 P M 0.10 mg/L 1 0.51 0 Iron 12/26/2013 8:21:06 P M 0.50 mg/L 1 242 0 Lead 12/26/2013 8:21:06 P M 0.20 mg/L 1 0.25 0 Manganese 12/26/2013 8:21:06 P M 0.10 mg/L 1 145 0 Nickel 12/26/2013 8:21:06 P M 0.10 mg/L 1 1.56 0 Selenium 12/26/2013 8:21:06 P M 0.20 mg/L 1 1.28 0 Silver 12/26/2013 8:21:06 P M 0.050 mg/L 1 < 0.050 0 Zinc 12/26/2013 8:21:06 P M 0.10 mg/L 1 1.34 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 1/4/2014 0.02 mg/L 1 0.42 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: MCO

Oil & Grease 12/30/2013 5:57:00 P M 18 mg/L 3.57 < 18 0

I.D. 56-00306 PA DEP 

# Page 4 of 4

# Friday, January10, 2014

GenOn ENERGY INC. - KEYSTONE STATION Mark Jacklin

Dear Mark Jacklin: RE: Key stone 611 Q(a) Order No.: G1312B09 KEYSTONE STATION 313 KEYSTONE DRIVE SHELOCTA, PA 15774-7625 2005 N. Center Ave. Somerset, PA 15501 814/443-1671 814/445-6666 FAX: 814/445-6729



# Geochemical Testing received 2 sample(s) on 12/30/2013 for the analyses presented in the following report.

Leslie A. Nemeth There were no problems with the analyses and all QC data met NELAC, EPA, and laboratory specifications except where noted in the Case Narrative or Laboratory Results. If you have any questions regarding these tests results, please feel free to call. Sincerely,

Pro j ect Manager Timothy W. Bergstresser Director of Technical Services

Page 1 of 4

### 10-Jan-14 Date: 

# Geochemical Testing
Project: Keystone 611 Q(a) CLIENT: GenOn ENERGY INC. - KEYSTONE STA
Lab Order: G1312B09 

# CASE NARRATIVE
No problems were encountered during analysis of this workorder, except if noted in this report.

Legend: J - Indicates an estimated value.

B - Analyte detected in the associated Method Blank S - Spike Recovery outside accepted recovery limits R - RPD outside accepted recovery limits ND - Not Detected at the Quantitation Limit
E - Value above quantitation range

I.D. 56-00306 PA DEP ** - Value exceeds Action Limit U - The analyte was not detected at or above the listed concentration, which is below the laboratory quantitation limit.
H - Method Hold Time Exceeded Q - Qualifier DF - Dilution Factor QL -Quantitation Limit MCL - Contaminant Limit 

# Page 2 of 4

### Project: Keystone 611 Q(a) Client Sample ID: Outfall 101

Collection Date: 12/30/2013 9:45:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1312B09
Lab ID: G1312B09-001

DF 

# Geochemical Testing Date: 10-Jan-14

Received Date: 12/30/2013 6:11:48 PM 

# Laboratory Results

Sampled By : NRG

MCL
PHYSICAL TESTS SM 2540D Analyst: MBG

Total suspended solids 12/31/2013 3:54:49 P M 1 mg/L 1 < 1 10 

### INORGANIC NON-METALS SM 2540 C Analyst: MBG

Total dissolved solids 12/31/2013 3:49:43 P M 100 mg/L 5 22000 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 12/31/2013 12:00:00 P 2 mg/L 1.5 < 2 25 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 1/6/2014 2:17:00 PM 1000 mg/L 200 13500 

### INORGANIC METALS EPA 200.7 Analyst: JEK

Iron, dissolved 12/31/2013 7:40:25 P M 0.10 mg/L 2 < 0.10 0 Selenium, dissolved 12/31/2013 7:40:25 P M 0.04 mg/L 2 < 0.04 0 

### INORGANIC METALS SM 3112B Analyst: RXS

Mercury 12/31/2013 1:51:28 P M 0.0002 mg/L 1 < 0.0002 0.004 

### INORGANIC METALS EPA 200.7 Analyst: JEK

Aluminum 12/31/2013 7:37:49 P M 0.2 mg/L 2 < 0.2 0 Arsenic 12/31/2013 7:37:49 P M 0.04 mg/L 2 < 0.04 0 Beryllium 12/31/2013 7:37:49 P M 0.002 mg/L 2 < 0.002 0.8 Boron 1/2/2014 11:53:32 AM 5.00 mg/L 100 281 0 Cadmium 12/31/2013 7:37:49 P M 0.004 mg/L 2 < 0.004 0 Chromium 12/31/2013 7:37:49 P M 0.02 mg/L 2 < 0.02 0 Copper 12/31/2013 7:37:49 P M 0.02 mg/L 2 < 0.02 0.1 Iron 12/31/2013 7:37:49 P M 0.10 mg/L 2 < 0.10 0 Lead 12/31/2013 7:37:49 P M 0.04 mg/L 2 < 0.04 0.1 Manganese 12/31/2013 7:37:49 P M 0.02 mg/L 2 3.33 0 Nickel 12/31/2013 7:37:49 P M 0.02 mg/L 2 < 0.02 0 Selenium 12/31/2013 7:37:49 P M 0.04 mg/L 2 < 0.04 3.4 Silver 12/31/2013 7:37:49 P M 0.010 mg/L 2 < 0.010 0.1 Zinc 12/31/2013 7:37:49 P M 0.02 mg/L 2 < 0.02 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 1/4/2014 0.02 mg/L 1 < 0.02 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: MCO

Oil & Grease 1/2/2014 5:34:00 PM 5 mg/L 1.01 < 5 15

I.D. 56-00306 PA DEP 

# Page 3 of 4

### Project: Keystone 611 Q(a) Client Sample ID: FGD Influent

Collection Date: 12/30/2013 9:30:00 AM Matrix: AQUEOUS Analyses Result Q Units Date Analyzed QL CLIENT: GenOn ENERGY INC. - KEYSTONE STATION Lab Order: G1312B09
Lab ID: G1312B09-002

DF 

# Geochemical Testing Date: 10-Jan-14

Received Date: 12/30/2013 6:11:48 PM 

# Laboratory Results

Sampled By : NRG IWT Influent Special

MCL
INORGANIC NON-METALS SM 2540 C Analyst: MBG

Total dissolved solids 12/31/2013 3:49:43 P M 100 mg/L 5 21800 0 

### PHYSICAL TESTS SM 2540D Analyst: MBG

Total suspended solids 12/31/2013 3:54:46 P M 100 mg/L 20 20300 0 

### INDICATOR ORGANIC PARAMETERS SM 5210 B Analyst: MMR

BOD 5-day 12/31/2013 12:00:00 P 3 mg/L 3 10 0 

### INORGANIC NON-METALS USGS I-1187-85 Analyst: SEF

Chloride 1/6/2014 2:17:00 PM 1000 mg/L 200 12600 

### INORGANIC METALS EPA 200.7 Analyst: JEK

Iron, dissolved 12/31/2013 7:43:02 P M 0.10 mg/L 2 < 0.10 0 Selenium, dissolved 12/31/2013 7:43:02 P M 0.04 mg/L 2 0.25 0 

### INORGANIC METALS SM 3112B Analyst: RXS

Mercury 12/31/2013 3:59:41 P M 0.0010 mg/L 5 0.0155 0 

### INORGANIC METALS EPA 200.7 Analyst: GMG

Aluminum 1/3/2014 1:25:00 PM 1.0 mg/L 1 456 0 Arsenic 1/3/2014 1:25:00 PM 0.20 mg/L 1 3.38 0 Beryllium 1/3/2014 1:25:00 PM 0.010 mg/L 1 0.040 0 Boron 1/3/2014 1:25:00 PM 0.50 mg/L 1 390 0 Cadmium 1/3/2014 1:25:00 PM 0.020 mg/L 1 0.035 0 Chromium 1/3/2014 1:25:00 PM 0.10 mg/L 1 2.67 0 Copper 1/3/2014 1:25:00 PM 0.10 mg/L 1 1.85 0 Iron 1/3/2014 1:25:00 PM 0.50 mg/L 1 1160 0 Lead 1/3/2014 1:25:00 PM 0.20 mg/L 1 0.83 0 Manganese 1/3/2014 1:25:00 PM 0.10 mg/L 1 131 0 Nickel 1/3/2014 1:25:00 PM 0.10 mg/L 1 2.92 0 Selenium 1/3/2014 1:25:00 PM 0.20 mg/L 1 4.59 0 Silver 1/3/2014 1:25:00 PM 0.050 mg/L 1 < 0.050 0 Zinc 1/3/2014 1:25:00 PM 0.10 mg/L 1 4.21 0 

### TRIVALENT CHROMIUM EPA 200.7/I-1230-85 Analyst: LAN

Trivalent Chromium 1/9/2014 0.02 mg/L 1 2.67 0 

### INDICATOR ORGANIC PARAMETERS EPA 1664 Analyst: MCO

Oil & Grease 1/2/2014 5:34:00 PM 18 mg/L 3.57 < 18 0

I.D. 56-00306 PA DEP 

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