No problems were encountered during analysis of this workorder, except if noted in this report.

REVISED REPORT: 05/05/2014

Due to an entry error, the Oil & Grease results for Outfall 001 (G1403F81_001) and the FGD Influent

(G1403F81_002) were interchanged on the original reports. Results corrected on this work order.

Note: This is a reissue of a previously generated report. Information herein supersedes that of previously

issued report(s).

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(a) CASE NARRATIVE

Lab Order: G1403F81

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 04/01/2014 13:31

Inorganic Non-Metals SM 2540 C Analyst: KLS

 Total dissolved solids 22300 20 mg/L 1 04/01/2014 13:31

Indicator Organic Parameters SM 5210 B Analyst: MMR

 BOD 5-day < 2 2 mg/L 1.5 04/02/2014 07:18

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

 Chloride 12700 1000 mg/L 200 04/01/2014 09:28

Inorganic Metals EPA 200.8 Analyst: RLM

 Selenium, dissolved 0.028 0.001 mg/L 1 04/16/2014 14:45

Inorganic Metals EPA 200.8 Analyst: RXS

 Arsenic 0.001 0.001 mg/L 1 04/03/2014 11:11

 Chromium < 0.005 0.005 mg/L 1 04/03/2014 11:11

 Nickel 0.0068 0.0005 mg/L 1 04/03/2014 11:11

 Selenium 0.025 0.001 mg/L 1 04/03/2014 11:11

Inorganic Metals EPA 200.7 Analyst: JEK

 Iron, dissolved < 0.05 0.05 mg/L 1 04/03/2014 16:40

Inorganic Metals SM 3112B Analyst: RXS

 Mercury < 0.0002 0.0002 mg/L 1 04/02/2014 09:56

Inorganic Metals EPA 200.7 Analyst: JEK

 Aluminum < 0.1 0.1 mg/L 1 04/03/2014 16:37

 Beryllium < 0.001 0.001 mg/L 1 04/03/2014 16:37

 Boron 237 2.50 mg/L 50 04/04/2014 13:18

 Cadmium 0.002 0.002 mg/L 1 04/03/2014 16:37

 Copper < 0.01 0.01 mg/L 1 04/03/2014 16:37

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: G1403F81

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

Lab ID: G1403F81-001 Collection Date: 03/31/2014 09:45

Matrix: Aqueous Received Date: 03/31/2014 15:57

Analyses Result QL Q Units DF Date Analyzed

Page 2 of 5
 Iron < 0.05 0.05 mg/L 1 04/03/2014 16:37

 Lead < 0.02 0.02 mg/L 1 04/03/2014 16:37

 Manganese 14.8 0.01 mg/L 1 04/03/2014 16:37

 Silver < 0.005 0.005 mg/L 1 04/03/2014 16:37

 Zinc < 0.01 0.01 mg/L 1 04/03/2014 16:37

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

 Trivalent Chromium < 0.02 0.02 mg/L 1 04/08/2014 00:00

Indicator Organic Parameters EPA 1664 Analyst: NEL

 Oil & Grease < 5 5 mg/L 1.03 04/04/2014 15:08

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: G1403F81

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

Lab ID: G1403F81-001 Collection Date: 03/31/2014 09:45

Matrix: Aqueous Received Date: 03/31/2014 15:57

Analyses Result QL Q Units DF Date Analyzed

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

 Total dissolved solids 27600 100 mg/L 5 04/01/2014 13:31

Physical Tests SM 2540D Analyst: KLS

 Total suspended solids 635 5 mg/L 1 04/01/2014 13:31

Indicator Organic Parameters SM 5210 B Analyst: MMR

 BOD 5-day 17 3 mg/L 3 04/02/2014 07:18

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

 Chloride 13900 1000 mg/L 200 04/01/2014 09:28

Inorganic Metals EPA 200.7 Analyst: GMG

 Iron, dissolved < 0.10 0.10 mg/L 2 04/07/2014 16:40

 Selenium, dissolved 0.09 0.04 mg/L 2 04/07/2014 16:40

Inorganic Metals SM 3112B Analyst: RXS

 Mercury 0.310 0.100 mg/L 500 04/02/2014 09:57

Inorganic Metals EPA 200.7 Analyst: GMG

 Aluminum 239 1.0 mg/L 1 04/09/2014 21:11

 Arsenic 1.79 0.20 mg/L 1 04/09/2014 21:11

 Beryllium 0.035 0.010 mg/L 1 04/09/2014 21:11

 Boron 384 5.00 mg/L 10 04/11/2014 19:51

 Cadmium < 0.020 0.020 mg/L 1 04/09/2014 21:11

 Chromium 1.55 0.10 mg/L 1 04/09/2014 21:11

 Copper 1.32 0.10 mg/L 1 04/09/2014 21:11

 Iron 1190 0.50 mg/L 1 04/09/2014 21:11

 Lead 0.65 0.20 mg/L 1 04/09/2014 21:11

 Manganese 318 0.10 mg/L 1 04/09/2014 21:11

 Nickel 2.82 0.10 mg/L 1 04/09/2014 21:11

 Selenium 2.56 0.20 mg/L 1 04/09/2014 21:11

 Silver < 0.050 0.050 mg/L 1 04/09/2014 21:11

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: G1403F81 IWT Influent Special

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

Lab ID: G1403F81-002 Collection Date: 03/31/2014 09:30

Matrix: Aqueous Received Date: 03/31/2014 15:57

Analyses Result QL Q Units DF Date Analyzed

Page 4 of 5
 Zinc 3.15 0.10 mg/L 1 04/09/2014 21:11

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

 Trivalent Chromium 1.55 0.02 mg/L 1 04/10/2014 00:00

Indicator Organic Parameters EPA 1664 Analyst: NEL

 Oil & Grease < 18 18 mg/L 3.57 04/04/2014 16:26

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: G1403F81 IWT Influent Special

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

Lab ID: G1403F81-002 Collection Date: 03/31/2014 09:30

Matrix: Aqueous Received Date: 03/31/2014 15:57

Analyses Result QL Q Units DF Date Analyzed

Page 5 of 5