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: G1404D11

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 04/22/2014 11:01

Inorganic Non-Metals SM 2540 C Analyst: KLS

 Total dissolved solids 23000 20 mg/L 1 04/22/2014 11:07

Indicator Organic Parameters SM 5210 B Analyst: MMR

 BOD 5-day < 2 2 mg/L 1.5 04/23/2014 06:39

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

 Chloride 10800 1000 mg/L 200 04/23/2014 10:26

Inorganic Metals EPA 200.8 Analyst: RLM

 Selenium, dissolved 0.039 0.001 mg/L 1 04/25/2014 03:50

Inorganic Metals EPA 200.8 Analyst: RLM

 Arsenic 0.002 0.001 mg/L 1 04/25/2014 03:44

 Chromium < 0.005 0.005 mg/L 1 04/25/2014 03:44

 Nickel 0.0036 0.0005 mg/L 1 04/25/2014 03:44

 Selenium 0.039 0.001 mg/L 1 04/25/2014 03:44

Inorganic Metals EPA 200.7 Analyst: JEK

 Iron, dissolved < 0.05 0.05 mg/L 1 04/24/2014 18:36

Inorganic Metals SM 3112B Analyst: RLM

 Mercury < 0.0050 0.0050 mg/L 25 04/24/2014 14:34

Inorganic Metals EPA 200.7 Analyst: JEK

 Aluminum < 0.1 0.1 mg/L 1 04/24/2014 18:33

 Beryllium < 0.001 0.001 mg/L 1 04/24/2014 18:33

 Boron 216 2.50 mg/L 50 04/26/2014 16:25

 Cadmium < 0.002 0.002 mg/L 1 04/24/2014 18:33

 Copper < 0.01 0.01 mg/L 1 04/24/2014 18:33

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: Outfall 101

Lab Order: G1404D11

Project: Keystone 611 W Sampled By: NRG

Lab ID: G1404D11-001 Collection Date: 04/21/2014 09:15

Matrix: Aqueous Received Date: 04/21/2014 17:20

Analyses Result QL Q Units DF Date Analyzed

Page 2 of 5
 Iron < 0.05 0.05 mg/L 1 04/24/2014 18:33

 Lead < 0.02 0.02 mg/L 1 04/24/2014 18:33

 Manganese 4.19 0.01 mg/L 1 04/24/2014 18:33

 Silver < 0.005 0.005 mg/L 1 04/24/2014 18:33

 Zinc < 0.01 0.01 mg/L 1 04/24/2014 18:33

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

 Trivalent Chromium < 0.02 0.02 mg/L 1 04/28/2014 00:00

Indicator Organic Parameters EPA 1664 Analyst: AEO

 Oil & Grease < 5 5 mg/L 1 04/23/2014 15:05

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: G1404D11

Project: Keystone 611 W Sampled By: NRG

Lab ID: G1404D11-001 Collection Date: 04/21/2014 09:15

Matrix: Aqueous Received Date: 04/21/2014 17:20

Analyses Result QL Q Units DF Date Analyzed

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

 Total dissolved solids 26300 100 mg/L 5 04/22/2014 14:17

Physical Tests SM 2540D Analyst: KLS

 Total suspended solids 4000 100 mg/L 20 04/22/2014 11:01

Indicator Organic Parameters SM 5210 B Analyst: MMR

 BOD 5-day 5 3 mg/L 3 04/23/2014 06:39

Inorganic Metals USGS I-1230-85 Analyst: SEF

 Hexavalent Chromium < 0.020 0.020 mg/L 1 04/21/2014 18:23

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

 Chloride 12000 1000 mg/L 200 04/23/2014 10:26

Inorganic Metals EPA 200.7 Analyst: JEK

 Iron, dissolved < 0.05 0.05 mg/L 1 04/24/2014 18:38

 Selenium, dissolved 0.19 0.02 mg/L 1 04/24/2014 18:38

Inorganic Metals SM 3112B Analyst: RLM

 Mercury 0.160 0.100 mg/L 500 04/24/2014 14:36

Inorganic Metals EPA 200.7 Analyst: JEK

 Aluminum 47.1 1.0 mg/L 1 04/28/2014 12:52

 Arsenic 0.44 0.20 mg/L 1 04/28/2014 12:52

 Beryllium < 0.010 0.010 mg/L 1 04/28/2014 12:52

 Boron 276 5.00 mg/L 10 04/29/2014 11:47

 Cadmium 0.050 0.020 mg/L 1 04/28/2014 12:52

 Chromium 0.39 0.10 mg/L 1 04/28/2014 12:52

 Copper 0.35 0.10 mg/L 1 04/28/2014 12:52

 Iron 263 0.50 mg/L 1 04/28/2014 12:52

 Lead < 0.20 0.20 mg/L 1 04/28/2014 12:52

 Manganese 204 0.10 mg/L 1 04/29/2014 11:56

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: G1404D11 IWT Influent Special

Project: Keystone 611 W Sampled By: NRG

Lab ID: G1404D11-002 Collection Date: 04/21/2014 09:00

Matrix: Aqueous Received Date: 04/21/2014 17:20

Analyses Result QL Q Units DF Date Analyzed

Page 4 of 5
 Nickel 1.97 0.10 mg/L 1 04/28/2014 12:52

 Selenium 1.45 0.20 mg/L 1 04/28/2014 12:52

 Silver < 0.050 0.050 mg/L 1 04/28/2014 12:52

 Zinc 11.4 0.10 mg/L 1 04/28/2014 12:52

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

 Trivalent Chromium 0.39 0.02 mg/L 1 04/29/2014 00:00

Indicator Organic Parameters EPA 1664 Analyst: AEO

 Oil & Grease < 22 22 mg/L 4.35 04/23/2014 14:55

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: FGD Influent

Lab Order: G1404D11 IWT Influent Special

Project: Keystone 611 W Sampled By: NRG

Lab ID: G1404D11-002 Collection Date: 04/21/2014 09:00

Matrix: Aqueous Received Date: 04/21/2014 17:20

Analyses Result QL Q Units DF Date Analyzed

Page 5 of 5