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

Project: Keystone 611 W CASE NARRATIVE

Lab Order: G1401B90

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 8 1 mg/L 1 01/28/2014 14:08

Inorganic Non-Metals SM 2540 C Analyst: KLS

 Total dissolved solids 30300 100 mg/L 5 01/28/2014 14:07

Indicator Organic Parameters SM 5210 B Analyst: MMR

 BOD 5-day < 2 2 mg/L 1.5 01/29/2014 06:57

Inorganic Non-Metals USGS I-1187-85 Analyst: SEF

 Chloride 13900 1000 mg/L 200 01/28/2014 09:52

Inorganic Metals EPA 200.8 Analyst: RXS

 Arsenic < 0.002 0.002 mg/L 2 02/03/2014 14:24

 Chromium < 0.010 0.010 mg/L 2 02/03/2014 14:24

 Nickel 0.0460 0.0010 mg/L 2 02/03/2014 14:24

 Selenium 0.039 0.002 mg/L 2 02/03/2014 14:24

Inorganic Metals EPA 200.7 Analyst: GMG

 Iron, dissolved < 0.05 0.05 mg/L 1 01/31/2014 08:04

 Selenium, dissolved 0.07 0.02 mg/L 1 01/31/2014 08:04

Inorganic Metals SM 3112B Analyst: JEK

 Mercury < 0.0002 0.0002 mg/L 1 01/29/2014 11:28

Inorganic Metals EPA 200.7 Analyst: GMG

 Aluminum < 0.1 0.1 mg/L 1 01/31/2014 07:36

 Beryllium < 0.001 0.001 mg/L 1 01/31/2014 07:36

 Boron 295 2.50 mg/L 50 01/31/2014 14:40

 Cadmium < 0.002 0.002 mg/L 1 01/31/2014 07:36

 Copper < 0.01 0.01 mg/L 1 01/31/2014 07:36

 Iron < 0.05 0.05 mg/L 1 01/31/2014 07:36

 Lead 0.03 0.02 mg/L 1 01/31/2014 07:36

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: G1401B90

Project: Keystone 611 W Sampled By: NRG

Lab ID: G1401B90-001 Collection Date: 01/27/2014 09:00

Matrix: Aqueous Received Date: 01/27/2014 16:55

Analyses Result QL Q Units DF Date Analyzed

Page 2 of 5
 Manganese 32.3 0.01 mg/L 1 01/31/2014 07:36

 Silver < 0.005 0.005 mg/L 1 01/31/2014 07:36

 Zinc < 0.01 0.01 mg/L 1 01/31/2014 07:36

Trivalent Chromium EPA 200.7/I-1230-85 Analyst: LAN

 Trivalent Chromium < 0.02 0.02 mg/L 1 02/04/2014 00:00

Indicator Organic Parameters EPA 1664 Analyst: MCO

 Oil & Grease < 5 5 mg/L 1 01/29/2014 13:59

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: G1401B90

Project: Keystone 611 W Sampled By: NRG

Lab ID: G1401B90-001 Collection Date: 01/27/2014 09:00

Matrix: Aqueous Received Date: 01/27/2014 16:55

Analyses Result QL Q Units DF Date Analyzed

Page 3 of 5
Inorganic Non-Metals SM 2540 C Analyst: KLS

 Total dissolved solids 30200 100 mg/L 5 01/28/2014 14:07

Physical Tests SM 2540D Analyst: KLS

 Total suspended solids 3990 100 mg/L 20 01/28/2014 14:07

Indicator Organic Parameters SM 5210 B Analyst: MMR

 BOD 5-day 3 3 mg/L 3 01/29/2014 06:57

Inorganic Metals USGS I-1230-85 Analyst: CLS

 Hexavalent Chromium < 0.020 0.020 mg/L 1 01/27/2014 18:25

Inorganic Non-Metals USGS I-1187-85 Analyst: SEF

 Chloride 14600 1000 mg/L 200 01/28/2014 09:52

Inorganic Metals EPA 200.7 Analyst: GMG

 Iron, dissolved < 0.05 0.05 mg/L 1 01/31/2014 08:08

 Selenium, dissolved 0.11 0.02 mg/L 1 01/31/2014 08:08

Inorganic Metals SM 3112B Analyst: JEK

 Mercury 0.173 0.100 mg/L 500 01/29/2014 11:30

Inorganic Metals EPA 200.8 Analyst: RXS

 Arsenic 540 100 μg/L 10 02/03/2014 18:39

 Chromium 884 500 μg/L 10 02/04/2014 13:57

 Nickel 2060 500 μg/L 10 02/03/2014 18:39

 Selenium 1420 100 μg/L 10 02/03/2014 18:39

Inorganic Metals EPA 200.7 Analyst: GMG

 Aluminum 114 1.0 mg/L 1 01/31/2014 22:28

 Beryllium 0.012 0.010 mg/L 1 01/31/2014 22:28

 Boron 328 5.00 mg/L 10 02/03/2014 15:00

 Cadmium < 0.020 0.020 mg/L 1 01/31/2014 22:28

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: FGD Influent

Lab Order: G1401B90 IWT Influent Special

Project: Keystone 611 W Sampled By: NRG

Lab ID: G1401B90-002 Collection Date: 01/27/2014 08:45

Matrix: Aqueous Received Date: 01/27/2014 16:55

Analyses Result QL Q Units DF Date Analyzed

Page 4 of 5
 Copper 0.97 0.10 mg/L 1 01/31/2014 22:28

 Iron 541 0.50 mg/L 1 01/31/2014 22:28

 Lead < 0.20 0.20 mg/L 1 01/31/2014 22:28

 Manganese 142 0.10 mg/L 1 01/31/2014 22:28

 Silver < 0.050 0.050 mg/L 1 01/31/2014 22:28

 Zinc 1.87 0.10 mg/L 1 01/31/2014 22:28

Trivalent Chromium EPA 200.7/I-1230-85 Analyst: LAN

 Trivalent Chromium 0.88 0.02 mg/L 1 02/11/2014 00:00

Indicator Organic Parameters EPA 1664 Analyst: MCO

 Oil & Grease < 18 18 mg/L 3.57 01/31/2014 15:02

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: G1401B90 IWT Influent Special

Project: Keystone 611 W Sampled By: NRG

Lab ID: G1401B90-002 Collection Date: 01/27/2014 08:45

Matrix: Aqueous Received Date: 01/27/2014 16:55

Analyses Result QL Q Units DF Date Analyzed

Page 5 of 5