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: G1402921

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 2 1 mg/L 1 02/25/2014 14:21

Inorganic Non-Metals SM 2540 C Analyst: KLS

 Total dissolved solids 28000 20 mg/L 1 02/25/2014 14:21

Indicator Organic Parameters SM 5210 B Analyst: MMR

 BOD 5-day < 2 2 mg/L 1.5 02/26/2014 06:41

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

 Chloride 15800 1000 mg/L 200 03/03/2014 10:47

Inorganic Metals EPA 200.8 Analyst: RXS

 Selenium, dissolved 0.049 0.005 mg/L 5 03/03/2014 11:38

Inorganic Metals EPA 200.8 Analyst: RXS

 Arsenic 0.002 0.001 mg/L 1 02/27/2014 12:04

 Chromium < 0.005 0.005 mg/L 1 02/27/2014 12:04

 Nickel 0.0055 0.0005 mg/L 1 02/27/2014 12:04

 Selenium 0.080 0.001 mg/L 1 02/26/2014 13:19

Inorganic Metals EPA 200.7 Analyst: GMG

 Iron, dissolved < 0.05 0.05 mg/L 1 02/26/2014 19:02

Inorganic Metals SM 3112B Analyst: RLD

 Mercury < 0.0002 0.0002 mg/L 1 02/27/2014 09:10

Inorganic Metals EPA 200.7 Analyst: GMG

 Aluminum < 0.1 0.1 mg/L 1 02/27/2014 14:46

 Beryllium < 0.001 0.001 mg/L 1 02/27/2014 14:46

 Boron 274 2.50 mg/L 50 02/27/2014 14:16

 Cadmium 0.003 0.002 mg/L 1 02/27/2014 14:46

 Copper 0.02 0.01 mg/L 1 02/27/2014 14:46

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: G1402921

Project: Keystone 611 W Sampled By: NRG

Lab ID: G1402921-001 Collection Date: 02/24/2014 09:15

Matrix: Aqueous Received Date: 02/24/2014 17:01

Analyses Result QL Q Units DF Date Analyzed

Page 2 of 5
 Iron < 0.05 0.05 mg/L 1 02/27/2014 14:46

 Lead < 0.02 0.02 mg/L 1 02/27/2014 14:46

 Manganese 18.8 0.01 mg/L 1 02/27/2014 14:46

 Silver < 0.005 0.005 mg/L 1 02/27/2014 14:46

 Zinc < 0.01 0.01 mg/L 1 02/27/2014 14:46

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

 Trivalent Chromium < 0.02 0.02 mg/L 1 02/28/2014 00:00

Indicator Organic Parameters EPA 1664 Analyst: MTM

 Oil & Grease < 5 5 mg/L 1 02/28/2014 08:23

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: G1402921

Project: Keystone 611 W Sampled By: NRG

Lab ID: G1402921-001 Collection Date: 02/24/2014 09:15

Matrix: Aqueous Received Date: 02/24/2014 17:01

Analyses Result QL Q Units DF Date Analyzed

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

 Total dissolved solids 30900 100 mg/L 5 02/25/2014 14:21

Physical Tests SM 2540D Analyst: KLS

 Total suspended solids 6710 100 mg/L 20 02/25/2014 14:21

Indicator Organic Parameters SM 5210 B Analyst: MMR

 BOD 5-day 11 3 mg/L 3 02/26/2014 06:41

Inorganic Metals USGS I-1230-85 Analyst: MLR

 Hexavalent Chromium < 0.020 0.020 mg/L 1 02/24/2014 17:43

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

 Chloride 18500 1000 mg/L 200 03/03/2014 10:47

Inorganic Metals EPA 200.7 Analyst: GMG

 Iron, dissolved < 0.05 0.05 mg/L 1 02/26/2014 19:07

 Selenium, dissolved 0.31 0.02 mg/L 1 02/26/2014 19:07

Inorganic Metals SM 3112B Analyst: RLD

 Mercury < 0.100 0.100 mg/L 500 02/27/2014 09:15

Inorganic Metals EPA 200.7 Analyst: GMG

 Aluminum 38.5 1.0 mg/L 1 02/26/2014 17:16

 Arsenic 0.27 0.20 mg/L 1 02/26/2014 17:16

 Beryllium < 0.010 0.010 mg/L 1 02/26/2014 17:16

 Boron 394 5.00 mg/L 10 02/27/2014 14:08

 Cadmium 0.058 0.020 mg/L 1 02/26/2014 17:16

 Chromium 0.30 0.10 mg/L 1 02/26/2014 17:16

 Copper 0.22 0.10 mg/L 1 02/26/2014 17:16

 Iron 231 0.50 mg/L 1 02/26/2014 17:16

 Lead < 0.20 0.20 mg/L 1 02/26/2014 17:16

 Manganese 377 0.10 mg/L 1 02/26/2014 17:16

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: G1402921 IWT Influent Special

Project: Keystone 611 W Sampled By: NRG

Lab ID: G1402921-002 Collection Date: 02/24/2014 09:00

Matrix: Aqueous Received Date: 02/24/2014 17:01

Analyses Result QL Q Units DF Date Analyzed

Page 4 of 5
 Nickel 2.71 0.10 mg/L 1 02/26/2014 17:16

 Selenium 1.32 0.20 mg/L 1 02/26/2014 17:16

 Silver < 0.050 0.050 mg/L 1 02/26/2014 17:16

 Zinc 0.93 0.10 mg/L 1 02/26/2014 17:16

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

 Trivalent Chromium 0.30 0.02 mg/L 1 02/28/2014 00:00

Indicator Organic Parameters EPA 1664 Analyst: MCO

 Oil & Grease < 18 18 mg/L 3.57 03/03/2014 17:30

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: G1402921 IWT Influent Special

Project: Keystone 611 W Sampled By: NRG

Lab ID: G1402921-002 Collection Date: 02/24/2014 09:00

Matrix: Aqueous Received Date: 02/24/2014 17:01

Analyses Result QL Q Units DF Date Analyzed

Page 5 of 5