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: G1401865

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 6 1 mg/L 1 01/21/2014 14:28

Inorganic Non-Metals SM 2540 C Analyst: KLS

 Total dissolved solids 23800 20 mg/L 1 01/21/2014 14:28

Indicator Organic Parameters SM 5210 B Analyst: MMR

 BOD 5-day < 2 2 mg/L 1.5 01/22/2014 06:51

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

 Chloride 15500 1000 mg/L 200 01/23/2014 09:20

Inorganic Metals EPA 200.7 Analyst: GMG

 Iron, dissolved < 0.05 0.05 mg/L 1 01/24/2014 17:32

 Selenium, dissolved < 0.02 0.02 mg/L 1 01/24/2014 17:32

Inorganic Metals SM 3112B Analyst: RXS

 Mercury < 0.0002 0.0002 mg/L 1 01/23/2014 10:21

Inorganic Metals EPA 200.8 Analyst: RXS

 Arsenic 2.9 1.0 μg/L 1 01/27/2014 17:21

Inorganic Metals EPA 200.7 Analyst: GMG

 Aluminum < 0.1 0.1 mg/L 1 01/24/2014 17:29

 Beryllium < 0.001 0.001 mg/L 1 01/24/2014 17:29

 Boron 279 2.50 mg/L 50 01/28/2014 15:41

 Cadmium 0.003 0.002 mg/L 1 01/24/2014 17:29

 Chromium < 0.01 0.01 mg/L 1 01/24/2014 17:29

 Copper 0.02 0.01 mg/L 1 01/24/2014 17:29

 Iron < 0.05 0.05 mg/L 1 01/24/2014 17:29

 Lead < 0.02 0.02 mg/L 1 01/24/2014 17:29

 Manganese 2.88 0.01 mg/L 1 01/24/2014 17:29

 Nickel < 0.01 0.01 mg/L 1 01/24/2014 17:29

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: G1401865

Project: Keystone 611 W Sampled By: NRG

Lab ID: G1401865-001 Collection Date: 01/20/2014 09:15

Matrix: Aqueous Received Date: 01/20/2014 16:45

Analyses Result QL Q Units DF Date Analyzed

Page 2 of 5
 Selenium < 0.02 0.02 mg/L 1 01/24/2014 17:29

 Silver < 0.005 0.005 mg/L 1 01/24/2014 17:29

 Zinc 0.01 0.01 mg/L 1 01/24/2014 17:29

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

 Trivalent Chromium < 0.02 0.02 mg/L 1 01/28/2014 00:00

Indicator Organic Parameters EPA 1664 Analyst: MCO

 Oil & Grease < 5 5 mg/L 1 01/22/2014 10:09

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: Outfall 101

Lab Order: G1401865

Project: Keystone 611 W Sampled By: NRG

Lab ID: G1401865-001 Collection Date: 01/20/2014 09:15

Matrix: Aqueous Received Date: 01/20/2014 16:45

Analyses Result QL Q Units DF Date Analyzed

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

 Total dissolved solids 24300 100 mg/L 5 01/21/2014 14:28

Physical Tests SM 2540D Analyst: KLS

 Total suspended solids 11800 100 mg/L 20 01/21/2014 14:28

Indicator Organic Parameters SM 5210 B Analyst: MMR

 BOD 5-day 3 2 mg/L 1.5 01/22/2014 06:51

Inorganic Metals USGS I-1230-85 Analyst: MLR

 Hexavalent Chromium < 0.020 0.020 mg/L 1 01/20/2014 18:06

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

 Chloride 11100 1000 mg/L 200 01/23/2014 09:20

Inorganic Metals EPA 200.7 Analyst: GMG

 Iron, dissolved < 0.05 0.05 mg/L 1 01/24/2014 17:35

 Selenium, dissolved < 0.02 0.02 mg/L 1 01/24/2014 17:35

Inorganic Metals SM 3112B Analyst: RXS

 Mercury 0.482 0.100 mg/L 500 01/23/2014 10:22

Inorganic Metals EPA 200.8 Analyst: RXS

 Arsenic 1400 100 μg/L 10 01/29/2014 04:34

Inorganic Metals EPA 200.7 Analyst: GMG

 Aluminum 283 1.0 mg/L 1 01/25/2014 00:21

 Beryllium 0.023 0.010 mg/L 1 01/25/2014 00:21

 Boron 347 0.50 mg/L 1 01/25/2014 00:21

 Cadmium < 0.020 0.020 mg/L 1 01/25/2014 00:21

 Chromium 1.62 0.10 mg/L 1 01/25/2014 00:21

 Copper 1.31 0.10 mg/L 1 01/25/2014 00:21

 Iron 784 0.50 mg/L 1 01/25/2014 00:21

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: G1401865 IWT Influent Special

Project: Keystone 611 W Sampled By: NRG

Lab ID: G1401865-002 Collection Date: 01/20/2014 09:00

Matrix: Aqueous Received Date: 01/20/2014 16:45

Analyses Result QL Q Units DF Date Analyzed

Page 4 of 5
 Lead 0.50 0.20 mg/L 1 01/25/2014 00:21

 Manganese 113 0.10 mg/L 1 01/25/2014 00:21

 Nickel 1.92 0.10 mg/L 1 01/25/2014 00:21

 Selenium 2.16 0.20 mg/L 1 01/25/2014 00:21

 Silver < 0.050 0.050 mg/L 1 01/25/2014 00:21

 Zinc 2.32 0.10 mg/L 1 01/25/2014 00:21

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

 Trivalent Chromium 1.62 0.02 mg/L 1 01/28/2014 00:00

Indicator Organic Parameters EPA 1664 Analyst: MCO

 Oil & Grease < 18 18 mg/L 3.57 01/22/2014 10:13

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: FGD Influent

Lab Order: G1401865 IWT Influent Special

Project: Keystone 611 W Sampled By: NRG

Lab ID: G1401865-002 Collection Date: 01/20/2014 09:00

Matrix: Aqueous Received Date: 01/20/2014 16:45

Analyses Result QL Q Units DF Date Analyzed

Page 5 of 5