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 Q(b) CASE NARRATIVE

Lab Order: G1404452

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 04/08/2014 14:54

Inorganic Non-Metals SM 2540 C Analyst: KLS

 Total dissolved solids 24700 20 mg/L 1 04/08/2014 14:53

Indicator Organic Parameters SM 5210 B Analyst: MMR

 BOD 5-day < 2 2 mg/L 1.5 04/09/2014 05:55

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

 Chloride 11000 1000 mg/L 200 04/09/2014 13:46

Inorganic Metals EPA 200.8 Analyst: RLD

 Selenium, dissolved 0.058 0.010 mg/L 10 04/18/2014 12:28

Inorganic Metals EPA 200.8 Analyst: RLD

 Arsenic 0.002 0.001 mg/L 1 04/10/2014 23:07

 Chromium < 0.005 0.005 mg/L 1 04/10/2014 23:07

 Nickel 0.0058 0.0005 mg/L 1 04/10/2014 23:07

 Selenium 0.032 0.001 mg/L 1 04/10/2014 23:07

Inorganic Metals EPA 200.7 Analyst: GMG

 Iron, dissolved < 0.05 0.05 mg/L 1 04/11/2014 02:38

Inorganic Metals SM 3112B Analyst: JEK

 Mercury < 0.0002 0.0002 mg/L 1 04/10/2014 11:08

Inorganic Metals EPA 200.7 Analyst: GMG

 Aluminum < 0.1 0.1 mg/L 1 04/11/2014 02:34

 Beryllium < 0.001 0.001 mg/L 1 04/11/2014 02:34

 Boron 240 2.50 mg/L 50 04/11/2014 20:23

 Cadmium < 0.002 0.002 mg/L 1 04/11/2014 02:34

 Copper < 0.01 0.01 mg/L 1 04/11/2014 02:34

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: G1404452

Project: Keystone 611 Q(b) Sampled By: NRG

Lab ID: G1404452-001 Collection Date: 04/07/2014 09:15

Matrix: Aqueous Received Date: 04/07/2014 17:14

Analyses Result QL Q Units DF Date Analyzed

Page 2 of 5
 Iron < 0.05 0.05 mg/L 1 04/11/2014 02:34

 Lead < 0.02 0.02 mg/L 1 04/11/2014 02:34

 Manganese 11.8 0.01 mg/L 1 04/11/2014 02:34

 Silver < 0.005 0.005 mg/L 1 04/11/2014 02:34

 Zinc < 0.01 0.01 mg/L 1 04/11/2014 02:34

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

 Trivalent Chromium < 0.02 0.02 mg/L 1 04/15/2014 00:00

Indicator Organic Parameters EPA 1664 Analyst: AEO

 Oil & Grease < 5 5 mg/L 1 04/11/2014 13:18

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: G1404452

Project: Keystone 611 Q(b) Sampled By: NRG

Lab ID: G1404452-001 Collection Date: 04/07/2014 09:15

Matrix: Aqueous Received Date: 04/07/2014 17:14

Analyses Result QL Q Units DF Date Analyzed

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

 Total dissolved solids 28000 100 mg/L 5 04/08/2014 14:53

Physical Tests SM 2540D Analyst: KLS

 Total suspended solids 2100 100 mg/L 20 04/08/2014 14:54

Indicator Organic Parameters SM 5210 B Analyst: MMR

 BOD 5-day < 3 3 mg/L 3 04/09/2014 05:55

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

 Chloride 6790 1000 mg/L 200 04/09/2014 13:46

Inorganic Metals EPA 200.7 Analyst: GMG

 Iron, dissolved < 0.05 0.05 mg/L 1 04/11/2014 02:42

 Selenium, dissolved 0.34 0.02 mg/L 1 04/11/2014 02:42

Inorganic Metals SM 3112B Analyst: JEK

 Mercury < 0.100 0.100 mg/L 500 04/10/2014 11:10

Inorganic Metals EPA 200.7 Analyst: GMG

 Aluminum 46.5 1.0 mg/L 1 04/09/2014 21:21

 Arsenic 0.39 0.20 mg/L 1 04/09/2014 21:21

 Beryllium < 0.010 0.010 mg/L 1 04/09/2014 21:21

 Boron 368 5.00 mg/L 10 04/11/2014 19:57

 Cadmium 0.027 0.020 mg/L 1 04/09/2014 21:21

 Chromium 0.32 0.10 mg/L 1 04/09/2014 21:21

 Copper 0.36 0.10 mg/L 1 04/09/2014 21:21

 Iron 215 0.50 mg/L 1 04/09/2014 21:21

 Lead < 0.20 0.20 mg/L 1 04/09/2014 21:21

 Manganese 256 0.10 mg/L 1 04/09/2014 21:21

 Nickel 1.94 0.10 mg/L 1 04/09/2014 21:21

 Selenium 0.94 0.20 mg/L 1 04/09/2014 21:21

 Silver < 0.050 0.050 mg/L 1 04/09/2014 21:21

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: G1404452 IWT Influent Special

Project: Keystone 611 Q(b) Sampled By: NRG

Lab ID: G1404452-002 Collection Date: 04/07/2014 09:00

Matrix: Aqueous Received Date: 04/07/2014 17:14

Analyses Result QL Q Units DF Date Analyzed

Page 4 of 5
 Zinc 0.86 0.10 mg/L 1 04/09/2014 21:21

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

 Trivalent Chromium 0.32 0.02 mg/L 1 04/15/2014 00:00

Indicator Organic Parameters EPA 1664 Analyst: AEO

 Oil & Grease < 18 18 mg/L 3.57 04/11/2014 13:32

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: G1404452 IWT Influent Special

Project: Keystone 611 Q(b) Sampled By: NRG

Lab ID: G1404452-002 Collection Date: 04/07/2014 09:00

Matrix: Aqueous Received Date: 04/07/2014 17:14

Analyses Result QL Q Units DF Date Analyzed

Page 5 of 5