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

REVISED REPORT (3/6/2014): The original mercury value for G1402038-001 (Outfall 101) was either

diluted by mistake or was a dilution-factor entry error. The sample was reanalyzed undiluted with no matrix

or analytical anomalies. Result is changed in this work order.

Note: This is a reissue of a previously generated report. Information herein supersedes that of previously

issued report(s).

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 M(a) CASE NARRATIVE

Lab Order: G1402038

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 8
Physical Tests SM 2540D Analyst: KLS

 Total suspended solids 1 1 mg/L 1 02/04/2014 13:44

Inorganic Non-Metals SM 2540 C Analyst: KLS

 Total dissolved solids 27100 20 mg/L 1 02/04/2014 13:58

Indicator Organic Parameters SM 5210 B Analyst: MMR

 BOD 5-day < 2 2 mg/L 1.5 02/05/2014 06:53

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

 Chloride 10400 1000 mg/L 200 02/04/2014 10:08

Inorganic Metals EPA 200.8 Analyst: RXS

 Selenium, dissolved 0.036 0.001 mg/L 1 02/24/2014 13:24

Inorganic Metals EPA 200.8 Analyst: RXS

 Arsenic < 0.005 0.005 mg/L 5 02/06/2014 14:30

 Chromium < 0.025 0.025 mg/L 5 02/06/2014 14:30

 Nickel 0.0172 0.0025 mg/L 5 02/06/2014 14:30

 Selenium 0.052 0.005 mg/L 5 02/06/2014 14:30

Inorganic Metals EPA 200.7 Analyst: GMG

 Iron, dissolved < 0.05 0.05 mg/L 1 02/05/2014 12:10

Inorganic Metals SM 3112B Analyst: RLD

 Mercury < 0.0002 0.0002 mg/L 1 03/06/2014 08:24

Inorganic Metals EPA 200.7 Analyst: GMG

 Aluminum < 0.1 0.1 mg/L 1 02/05/2014 12:07

 Beryllium < 0.001 0.001 mg/L 1 02/05/2014 12:07

 Boron 336 2.50 mg/L 50 02/06/2014 14:27

 Cadmium < 0.002 0.002 mg/L 1 02/05/2014 12:07

 Copper 0.01 0.01 mg/L 1 02/05/2014 12:07

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: G1402038

Project: Keystone 611 M(a) Sampled By: NRG

Lab ID: G1402038-001 Collection Date: 02/03/2014 09:15

Matrix: Aqueous Received Date: 02/03/2014 18:21

Analyses Result QL Q Units DF Date Analyzed

Page 2 of 8
 Iron < 0.05 0.05 mg/L 1 02/05/2014 12:07

 Lead < 0.02 0.02 mg/L 1 02/05/2014 12:07

 Manganese 16.7 0.01 mg/L 1 02/05/2014 12:07

 Silver < 0.005 0.005 mg/L 1 02/05/2014 12:07

 Zinc < 0.01 0.01 mg/L 1 02/05/2014 12:07

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

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

Indicator Organic Parameters EPA 1664 Analyst: MCO

 Oil & Grease < 5 5 mg/L 1.03 02/04/2014 16:32

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: G1402038

Project: Keystone 611 M(a) Sampled By: NRG

Lab ID: G1402038-001 Collection Date: 02/03/2014 09:15

Matrix: Aqueous Received Date: 02/03/2014 18:21

Analyses Result QL Q Units DF Date Analyzed

Page 3 of 8
Inorganic Non-Metals SM 2540 C Analyst: KLS

 Total dissolved solids 28200 100 mg/L 5 02/04/2014 13:58

Physical Tests SM 2540D Analyst: KLS

 Total suspended solids 9570 100 mg/L 20 02/04/2014 13:44

Indicator Organic Parameters SM 5210 B Analyst: MMR

 BOD 5-day 13 3 mg/L 3 02/05/2014 06:53

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

 Chloride 16000 1000 mg/L 200 02/04/2014 10:08

Inorganic Metals EPA 200.7 Analyst: GMG

 Iron, dissolved < 0.05 0.05 mg/L 1 02/05/2014 12:12

 Selenium, dissolved 0.02 0.02 mg/L 1 02/05/2014 12:12

Inorganic Metals SM 3112B Analyst: RXS

 Mercury 0.332 0.100 mg/L 500 02/07/2014 11:47

Inorganic Metals EPA 200.7 Analyst: GMG

 Aluminum 220 1.0 mg/L 1 02/06/2014 17:08

 Arsenic 1.21 0.20 mg/L 1 02/06/2014 17:08

 Beryllium 0.022 0.010 mg/L 1 02/06/2014 17:08

 Boron 368 5.00 mg/L 10 02/10/2014 17:07

 Cadmium < 0.020 0.020 mg/L 1 02/06/2014 17:08

 Chromium 1.51 0.10 mg/L 1 02/06/2014 17:08

 Copper 1.20 0.10 mg/L 1 02/06/2014 17:08

 Iron 89.4 0.50 mg/L 1 02/07/2014 11:59

 Lead 0.49 0.20 mg/L 1 02/06/2014 17:08

 Manganese 200 0.10 mg/L 1 02/06/2014 17:08

 Nickel 2.44 0.10 mg/L 1 02/06/2014 17:08

 Selenium 2.20 0.20 mg/L 1 02/06/2014 17:08

 Silver < 0.050 0.050 mg/L 1 02/06/2014 17:08

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: G1402038 IWT Influent Special

Project: Keystone 611 M(a) Sampled By: NRG

Lab ID: G1402038-002 Collection Date: 02/03/2014 09:00

Matrix: Aqueous Received Date: 02/03/2014 18:21

Analyses Result QL Q Units DF Date Analyzed

Page 4 of 8
 Zinc 2.44 0.10 mg/L 1 02/06/2014 17:08

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

 Trivalent Chromium 1.27 0.02 mg/L 1 02/17/2014 00:00

Indicator Organic Parameters EPA 1664 Analyst: MCO

 Oil & Grease < 22 22 mg/L 4.35 02/04/2014 16:18

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: G1402038 IWT Influent Special

Project: Keystone 611 M(a) Sampled By: NRG

Lab ID: G1402038-002 Collection Date: 02/03/2014 09:00

Matrix: Aqueous Received Date: 02/03/2014 18:21

Analyses Result QL Q Units DF Date Analyzed

Page 5 of 8
Inorganic Non Metals SM 4500-CO2D Analyst: MBG

 Bicarbonate 37 5 mg/L CaCO3 1 02/04/2014 12:31

Inorganic Non-Metals SM 4500-CO2 Analyst: MBG

 Carbonate < 5 5 mg/L CaCO3 1 02/04/2014 12:31

Inorganic Non-Metals SM 2540 C Analyst: KLS

 Total dissolved solids 182 20 mg/L 1 02/04/2014 13:58

Physical Tests SM 2540D Analyst: KLS

 Total suspended solids 7 5 mg/L 1 02/04/2014 13:44

Inorganic Non-Metals ASTM D1067-06 Analyst: MBG

 Alkalinity to pH 4.5 37 5 mg/L CaCO3 1 02/04/2014 12:31

Inorganic Non-Metals EPA 300.0 Analyst: MLR

 Nitrate Nitrogen 0.72 0.05 mg/L as N 1 02/04/2014 05:12

 Nitrite Nitrogen < 0.05 0.05 mg/L as N 1 02/04/2014 05:12

 Nitrate - Nitrite 0.72 0.05 mg/L as N 1 02/04/2014 05:12

Inorganic Non-Metals EPA 300.0 Analyst: MLR

 Chloride 25 1 mg/L 1 02/04/2014 05:12

 Fluoride < 0.1 0.1 mg/L 1 02/04/2014 05:12

 Sulfate 32 2 mg/L 1 02/04/2014 05:12

Inorganic Non-Metals EPA 350.1 Analyst: SLY

 Ammonia Nitrogen - Distilled < 0.10 0.10 mg/L as N 1 02/05/2014 12:04

Inorganics Non Metals SM 4500-SiO2 C Analyst: MLR

 Silica, total 5.5 0.20 mg/L 1 02/04/2014 13:32

Inorganic Metals EPA 200.7 Analyst: GMG

 Barium 0.04 0.01 mg/L 1 02/05/2014 13:06

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: Plum Creek

Lab Order: G1402038

Project: Keystone 611 M(a) Sampled By: NRG

Lab ID: G1402038-003 Collection Date: 02/03/2014 11:30

Matrix: Aqueous Received Date: 02/03/2014 18:21

Analyses Result QL Q Units DF Date Analyzed

Page 6 of 8
 Boron < 0.05 0.05 mg/L 1 02/05/2014 13:06

 Calcium 18.3 0.1 mg/L 1 02/05/2014 13:06

 Iron 0.50 0.05 mg/L 1 02/05/2014 13:06

 Magnesium 5.5 0.1 mg/L 1 02/05/2014 13:06

 Manganese 0.14 0.01 mg/L 1 02/05/2014 13:06

 Potassium 1.6 0.5 mg/L 1 02/05/2014 13:06

 Sodium 18.5 0.2 mg/L 1 02/05/2014 13:06

 Strontium 0.14 0.01 mg/L 1 02/05/2014 13:06

Indicator Organic Parameters SM 20 5310-C Analyst: NEL

 Total Organic Carbon 1.7 0.5 mg/L 1 02/05/2014 15:55

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: Plum Creek

Lab Order: G1402038

Project: Keystone 611 M(a) Sampled By: NRG

Lab ID: G1402038-003 Collection Date: 02/03/2014 11:30

Matrix: Aqueous Received Date: 02/03/2014 18:21

Analyses Result QL Q Units DF Date Analyzed

Page 7 of 8
Inorganic Non-Metals SM 2540 C Analyst: KLS

 Total dissolved solids 242 20 mg/L 1 02/04/2014 13:58

Physical Tests SM 2540D Analyst: KLS

 Total suspended solids 8 5 mg/L 1 02/04/2014 13:44

Inorganic Non-Metals ASTM D1067-06 Analyst: MBG

 Alkalinity to pH 4.5 52 5 mg/L CaCO3 1 02/04/2014 12:35

Inorganic Non-Metals EPA 300.0 Analyst: MLR

 Nitrate Nitrogen 0.80 0.05 mg/L as N 1 02/04/2014 05:29

 Nitrite Nitrogen < 0.05 0.05 mg/L as N 1 02/04/2014 05:29

 Nitrate - Nitrite 0.80 0.05 mg/L as N 1 02/04/2014 05:29

Inorganic Non-Metals EPA 300.0 Analyst: MLR

 Chloride 52 1 mg/L 1 02/04/2014 05:29

 Sulfate 62 2 mg/L 1 02/04/2014 05:29

Inorganics Non Metals SM 4500-SiO2 C Analyst: MLR

 Silica, total 6.4 0.20 mg/L 1 02/04/2014 13:32

Inorganic Metals EPA 200.7 Analyst: GMG

 Calcium 31.0 0.1 mg/L 1 02/05/2014 16:32

 Iron 0.83 0.05 mg/L 1 02/05/2014 16:32

 Magnesium 8.6 0.1 mg/L 1 02/05/2014 16:32

 Manganese 0.19 0.01 mg/L 1 02/05/2014 16:32

 Potassium 2.0 0.5 mg/L 1 02/05/2014 16:32

 Sodium 39.8 0.2 mg/L 1 02/05/2014 16:32

Indicator Organic Parameters SM 20 5310-C Analyst: NEL

 Total Organic Carbon 1.8 0.5 mg/L 1 02/05/2014 20:14

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: Crooked Creek

Lab Order: G1402038

Project: Keystone 611 M(a) Sampled By: NRG

Lab ID: G1402038-004 Collection Date: 02/03/2014 08:30

Matrix: Aqueous Received Date: 02/03/2014 18:21

Analyses Result QL Q Units DF Date Analyzed

Page 8 of 8