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: G1404910

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 04/15/2014 15:01

Inorganic Non-Metals SM 2540 C Analyst: KLS

 Total dissolved solids 25800 20 mg/L 1 04/15/2014 15:01

Indicator Organic Parameters SM 5210 B Analyst: MMR

 BOD 5-day < 2 2 mg/L 1.5 04/16/2014 06:19

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

 Chloride 13100 1000 mg/L 200 04/17/2014 11:38

Inorganic Metals EPA 200.8 Analyst: RLD

 Selenium, dissolved 0.047 0.005 mg/L 5 04/18/2014 12:51

Inorganic Metals EPA 200.8 Analyst: RLD

 Arsenic 0.002 0.001 mg/L 1 04/17/2014 13:07

 Chromium < 0.005 0.005 mg/L 1 04/17/2014 13:07

 Nickel 0.0042 0.0005 mg/L 1 04/17/2014 13:07

 Selenium 0.047 0.005 mg/L 5 04/18/2014 12:45

Inorganic Metals EPA 200.7 Analyst: GMG

 Iron, dissolved < 0.05 0.05 mg/L 1 04/17/2014 17:24

Inorganic Metals SM 3112B Analyst: JEK

 Mercury < 0.0002 0.0002 mg/L 1 04/17/2014 09:27

Inorganic Metals EPA 200.7 Analyst: GMG

 Aluminum < 0.1 0.1 mg/L 1 04/17/2014 17:21

 Beryllium < 0.001 0.001 mg/L 1 04/17/2014 17:21

 Boron 228 2.50 mg/L 50 04/18/2014 13:40

 Cadmium < 0.002 0.002 mg/L 1 04/17/2014 17:21

 Copper 0.01 0.01 mg/L 1 04/17/2014 17:21

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: Outfall 101

Lab Order: G1404910

Project: Keystone 611 W Sampled By: NRG

Lab ID: G1404910-001 Collection Date: 04/14/2014 09:15

Matrix: Aqueous Received Date: 04/14/2014 18:28

Analyses Result QL Q Units DF Date Analyzed

Page 2 of 5
 Iron < 0.05 0.05 mg/L 1 04/17/2014 17:21

 Lead < 0.02 0.02 mg/L 1 04/17/2014 17:21

 Manganese 4.29 0.01 mg/L 1 04/17/2014 17:21

 Silver < 0.005 0.005 mg/L 1 04/18/2014 15:50

 Zinc < 0.01 0.01 mg/L 1 04/17/2014 17:21

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

 Trivalent Chromium < 0.02 0.02 mg/L 1 04/21/2014 00:00

Indicator Organic Parameters EPA 1664 Analyst: AEO

 Oil & Grease < 5 5 mg/L 1 04/16/2014 14:42

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: G1404910

Project: Keystone 611 W Sampled By: NRG

Lab ID: G1404910-001 Collection Date: 04/14/2014 09:15

Matrix: Aqueous Received Date: 04/14/2014 18:28

Analyses Result QL Q Units DF Date Analyzed

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

 Total dissolved solids 24300 200 mg/L 10 04/15/2014 15:01

Physical Tests SM 2540D Analyst: KLS

 Total suspended solids 8400 200 mg/L 40 04/15/2014 15:01

Indicator Organic Parameters SM 5210 B Analyst: MMR

 BOD 5-day 10 3 mg/L 3 04/16/2014 06:19

Inorganic Metals USGS I-1230-85 Analyst: CLS

 Hexavalent Chromium < 0.020 0.020 mg/L 1 04/14/2014 19:00

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

 Chloride 12700 1000 mg/L 200 04/17/2014 11:38

Inorganic Metals EPA 200.7 Analyst: GMG

 Iron, dissolved < 0.05 0.05 mg/L 1 04/17/2014 17:26

 Selenium, dissolved 0.31 0.02 mg/L 1 04/17/2014 17:26

Inorganic Metals SM 3112B Analyst: JEK

 Mercury 0.267 0.100 mg/L 500 04/17/2014 09:29

Inorganic Metals EPA 200.7 Analyst: GMG

 Aluminum 195 1.0 mg/L 1 04/17/2014 03:21

 Arsenic 1.60 0.20 mg/L 1 04/17/2014 03:21

 Beryllium 0.024 0.010 mg/L 1 04/17/2014 03:21

 Boron 275 5.00 mg/L 10 04/17/2014 13:47

 Cadmium < 0.020 0.020 mg/L 1 04/17/2014 03:21

 Chromium 1.30 0.10 mg/L 1 04/17/2014 03:21

 Copper 1.05 0.10 mg/L 1 04/17/2014 03:21

 Iron 821 0.50 mg/L 1 04/17/2014 03:21

 Lead 0.51 0.20 mg/L 1 04/17/2014 03:21

 Manganese 189 0.10 mg/L 1 04/17/2014 03:21

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: G1404910 IWT Influent Special

Project: Keystone 611 W Sampled By: NRG

Lab ID: G1404910-002 Collection Date: 04/14/2014 09:00

Matrix: Aqueous Received Date: 04/14/2014 18:28

Analyses Result QL Q Units DF Date Analyzed

Page 4 of 5
 Nickel 2.27 0.10 mg/L 1 04/17/2014 03:21

 Selenium 2.56 0.20 mg/L 1 04/17/2014 03:21

 Silver 0.061 0.050 mg/L 1 04/17/2014 03:21

 Zinc 2.68 0.10 mg/L 1 04/17/2014 03:21

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

 Trivalent Chromium 1.30 0.02 mg/L 1 04/21/2014 00:00

Indicator Organic Parameters EPA 1664 Analyst: AEO

 Oil & Grease < 18 18 mg/L 3.57 04/17/2014 13:33

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: G1404910 IWT Influent Special

Project: Keystone 611 W Sampled By: NRG

Lab ID: G1404910-002 Collection Date: 04/14/2014 09:00

Matrix: Aqueous Received Date: 04/14/2014 18:28

Analyses Result QL Q Units DF Date Analyzed

Page 5 of 5