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: G1403823

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 4 1 mg/L 1 03/18/2014 14:34

Inorganic Non-Metals SM 2540 C Analyst: KLS

 Total dissolved solids 25600 20 mg/L 1 03/18/2014 14:34

Indicator Organic Parameters SM 5210 B Analyst: MMR

 BOD 5-day < 2 2 mg/L 1.5 03/19/2014 06:48

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

 Chloride 16300 1000 mg/L 200 03/20/2014 14:20

Inorganic Metals EPA 200.8 Analyst: RXS

 Selenium, dissolved 0.026 0.001 mg/L 1 03/25/2014 16:41

Inorganic Metals EPA 200.8 Analyst: RXS

 Arsenic 0.002 0.001 mg/L 1 03/25/2014 16:36

 Chromium < 0.005 0.005 mg/L 1 03/25/2014 16:36

 Nickel 0.0043 0.0005 mg/L 1 03/25/2014 16:36

 Selenium 0.024 0.001 mg/L 1 03/25/2014 16:36

Inorganic Metals EPA 200.7 Analyst: GMG

 Iron, dissolved < 0.05 0.05 mg/L 1 03/21/2014 14:51

Inorganic Metals SM 3112B Analyst: RLD

 Mercury < 0.0002 0.0002 mg/L 1 03/19/2014 15:25

Inorganic Metals EPA 200.7 Analyst: GMG

 Aluminum < 0.1 0.1 mg/L 1 03/21/2014 14:47

 Beryllium < 0.001 0.001 mg/L 1 03/21/2014 14:47

 Boron 249 2.50 mg/L 50 03/24/2014 14:23

 Cadmium < 0.002 0.002 mg/L 1 03/21/2014 14:47

 Copper < 0.01 0.01 mg/L 1 03/21/2014 14:47

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: G1403823

Project: Keystone 611 W Sampled By: NRG

Lab ID: G1403823-001 Collection Date: 03/17/2014 09:30

Matrix: Aqueous Received Date: 03/17/2014 18:29

Analyses Result QL Q Units DF Date Analyzed

Page 2 of 5
 Iron < 0.05 0.05 mg/L 1 03/21/2014 14:47

 Lead < 0.02 0.02 mg/L 1 03/21/2014 14:47

 Manganese 7.95 0.01 mg/L 1 03/21/2014 14:47

 Silver < 0.005 0.005 mg/L 1 03/21/2014 14:47

 Zinc < 0.01 0.01 mg/L 1 03/21/2014 14:47

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

 Trivalent Chromium < 0.02 0.02 mg/L 1 03/26/2014 00:00

Indicator Organic Parameters EPA 1664 Analyst: MTM

 Oil & Grease < 5 5 mg/L 1.01 03/20/2014 15:29

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: G1403823

Project: Keystone 611 W Sampled By: NRG

Lab ID: G1403823-001 Collection Date: 03/17/2014 09:30

Matrix: Aqueous Received Date: 03/17/2014 18:29

Analyses Result QL Q Units DF Date Analyzed

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

 Total dissolved solids 23700 100 mg/L 5 03/18/2014 14:34

Physical Tests SM 2540D Analyst: KLS

 Total suspended solids 12000 100 mg/L 20 03/18/2014 14:34

Indicator Organic Parameters SM 5210 B Analyst: MMR

 BOD 5-day 12 3 mg/L 3 03/19/2014 06:48

Inorganic Metals USGS I-1230-85 Analyst: SEF

 Hexavalent Chromium < 0.020 0.020 mg/L 1 03/17/2014 19:00

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

 Chloride 17200 1000 mg/L 200 03/20/2014 14:20

Inorganic Metals EPA 200.7 Analyst: GMG

 Iron, dissolved < 0.05 0.05 mg/L 1 03/21/2014 14:56

 Selenium, dissolved 0.20 0.02 mg/L 1 03/21/2014 14:56

Inorganic Metals SM 3112B Analyst: RLD

 Mercury 0.378 0.100 mg/L 500 03/19/2014 15:27

Inorganic Metals EPA 200.7 Analyst: GMG

 Aluminum 218 1.0 mg/L 1 03/20/2014 20:32

 Arsenic 1.76 0.20 mg/L 1 03/20/2014 20:32

 Beryllium 0.026 0.010 mg/L 1 03/20/2014 20:32

 Boron 319 5.00 mg/L 10 03/24/2014 17:13

 Cadmium < 0.020 0.020 mg/L 1 03/20/2014 20:32

 Chromium 1.73 0.10 mg/L 1 03/20/2014 20:32

 Copper 1.16 0.10 mg/L 1 03/20/2014 20:32

 Iron 1000 0.50 mg/L 1 03/20/2014 20:32

 Lead 0.58 0.20 mg/L 1 03/20/2014 20:32

 Manganese 231 0.10 mg/L 1 03/20/2014 20:32

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: FGD Influent

Lab Order: G1403823 IWT Influent Special

Project: Keystone 611 W Sampled By: NRG

Lab ID: G1403823-002 Collection Date: 03/17/2014 09:15

Matrix: Aqueous Received Date: 03/17/2014 18:29

Analyses Result QL Q Units DF Date Analyzed

Page 4 of 5
 Nickel 2.79 0.10 mg/L 1 03/20/2014 20:32

 Selenium 2.87 0.20 mg/L 1 03/20/2014 20:32

 Silver < 0.050 0.050 mg/L 1 03/20/2014 20:32

 Zinc 4.35 0.10 mg/L 1 03/20/2014 20:32

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

 Trivalent Chromium 1.73 0.02 mg/L 1 03/26/2014 00:00

Indicator Organic Parameters EPA 1664 Analyst: MTM

 Oil & Grease < 18 18 mg/L 3.57 03/20/2014 17:33

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: G1403823 IWT Influent Special

Project: Keystone 611 W Sampled By: NRG

Lab ID: G1403823-002 Collection Date: 03/17/2014 09:15

Matrix: Aqueous Received Date: 03/17/2014 18:29

Analyses Result QL Q Units DF Date Analyzed

Page 5 of 5