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

Samples were not filtered in the field for dissolved metals; samples were lab filtered.

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: G1403C32

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 03/25/2014 10:15

Inorganic Non-Metals SM 2540 C Analyst: KLS

 Total dissolved solids 23900 20 mg/L 1 03/25/2014 10:16

Indicator Organic Parameters SM 5210 B Analyst: MMR

 BOD 5-day < 2 2 mg/L 1.5 03/26/2014 05:59

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

 Chloride 15000 1000 mg/L 200 03/25/2014 10:14

Inorganic Metals EPA 200.8 Analyst: RLD

 Selenium, dissolved 0.041 0.005 mg/L 5 04/02/2014 11:35

Inorganic Metals EPA 200.8 Analyst: RLD

 Arsenic < 0.005 0.005 mg/L 5 04/02/2014 11:30

 Chromium < 0.005 0.005 mg/L 1 03/31/2014 21:21

 Nickel 0.0104 0.0025 mg/L 5 04/02/2014 11:30

 Selenium 0.038 0.005 mg/L 5 04/02/2014 11:30

Inorganic Metals EPA 200.7 Analyst: GMG

 Iron, dissolved < 0.05 0.05 mg/L 1 03/28/2014 13:19

Inorganic Metals SM 3112B Analyst: RXS

 Mercury < 0.0002 0.0002 mg/L 1 03/31/2014 09:24

Inorganic Metals EPA 200.7 Analyst: GMG

 Aluminum < 0.1 0.1 mg/L 1 03/28/2014 13:16

 Beryllium < 0.001 0.001 mg/L 1 03/28/2014 13:16

 Boron 0.11 0.05 mg/L 1 03/28/2014 13:16

 Cadmium < 0.002 0.002 mg/L 1 03/28/2014 13:16

 Copper < 0.01 0.01 mg/L 1 03/28/2014 13:16

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: Outfall 101

Lab Order: G1403C32

Project: Keystone 611 W Sampled By: NRG

Lab ID: G1403C32-001 Collection Date: 03/24/2014 09:15

Matrix: Aqueous Received Date: 03/24/2014 17:21

Analyses Result QL Q Units DF Date Analyzed

Page 2 of 5
 Iron 0.05 0.05 mg/L 1 03/28/2014 13:16

 Lead < 0.02 0.02 mg/L 1 03/28/2014 13:16

 Manganese 0.14 0.01 mg/L 1 03/28/2014 13:16

 Silver < 0.005 0.005 mg/L 1 03/28/2014 13:16

 Zinc < 0.01 0.01 mg/L 1 03/28/2014 13:16

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

 Trivalent Chromium < 0.02 0.02 mg/L 1 04/03/2014 00:00

Indicator Organic Parameters EPA 1664 Analyst: MTM

 Oil & Grease < 5 5 mg/L 1 04/01/2014 15:00

 NOTES:

 S - Spike recovery indicates a possible matrix effect. The

method is in control as indicated by the LCS.

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: G1403C32

Project: Keystone 611 W Sampled By: NRG

Lab ID: G1403C32-001 Collection Date: 03/24/2014 09:15

Matrix: Aqueous Received Date: 03/24/2014 17:21

Analyses Result QL Q Units DF Date Analyzed

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

 Total dissolved solids 27700 100 mg/L 5 03/25/2014 10:16

Physical Tests SM 2540D Analyst: KLS

 Total suspended solids 4940 100 mg/L 20 03/25/2014 10:15

Indicator Organic Parameters SM 5210 B Analyst: MMR

 BOD 5-day 8 3 mg/L 3 03/26/2014 05:59

Inorganic Metals USGS I-1230-85 Analyst: MLR

 Hexavalent Chromium < 0.020 0.020 mg/L 1 03/24/2014 18:39

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

 Chloride 18000 1000 mg/L 200 03/25/2014 10:14

Inorganic Metals EPA 200.7 Analyst: GMG

 Iron, dissolved < 0.05 0.05 mg/L 1 03/28/2014 13:21

 Selenium, dissolved 0.10 0.02 mg/L 1 03/28/2014 13:21

Inorganic Metals SM 3112B Analyst: RXS

 Mercury < 0.100 0.100 mg/L 500 03/31/2014 09:26

Inorganic Metals EPA 200.7 Analyst: JEK

 Aluminum 17.1 1.0 mg/L 1 04/01/2014 23:22

 Arsenic < 0.20 0.20 mg/L 1 04/01/2014 23:22

 Beryllium < 0.010 0.010 mg/L 1 04/01/2014 23:22

 Boron 352 5.00 mg/L 10 04/02/2014 11:07

 Cadmium < 0.020 0.020 mg/L 1 04/01/2014 23:22

 Chromium < 0.10 0.10 mg/L 1 04/01/2014 23:22

 Copper 0.23 0.10 mg/L 1 04/01/2014 23:22

 Iron 73.3 0.50 mg/L 1 04/01/2014 23:22

 Lead < 0.20 0.20 mg/L 1 04/01/2014 23:22

 Manganese 279 0.10 mg/L 1 04/01/2014 23:22

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: G1403C32 IWT Influent Special

Project: Keystone 611 W Sampled By: NRG

Lab ID: G1403C32-002 Collection Date: 03/24/2014 09:00

Matrix: Aqueous Received Date: 03/24/2014 17:21

Analyses Result QL Q Units DF Date Analyzed

Page 4 of 5
 Nickel 1.65 0.10 mg/L 1 04/01/2014 23:22

 Selenium 0.40 0.20 mg/L 1 04/01/2014 23:22

 Silver < 0.050 0.050 mg/L 1 04/01/2014 23:22

 Zinc 0.79 0.10 mg/L 1 04/01/2014 23:22

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

 Trivalent Chromium 0.09 0.02 mg/L 1 04/03/2014 00:00

Indicator Organic Parameters EPA 1664 Analyst: MTM

 Oil & Grease < 17 17 mg/L 3.45 04/01/2014 14:05

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: FGD Influent

Lab Order: G1403C32 IWT Influent Special

Project: Keystone 611 W Sampled By: NRG

Lab ID: G1403C32-002 Collection Date: 03/24/2014 09:00

Matrix: Aqueous Received Date: 03/24/2014 17:21

Analyses Result QL Q Units DF Date Analyzed

Page 5 of 5