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: G1404H01

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: GMG

 Total suspended solids 2 1 mg/L 1 04/29/2014 15:21

Inorganic Non-Metals SM 2540 C Analyst: GMG

 Total dissolved solids 21300 20 mg/L 1 04/29/2014 15:22

Indicator Organic Parameters SM 5210 B Analyst: HJC

 BOD 5-day < 2 2 mg/L 1.5 04/30/2014 07:30

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

 Chloride 12200 1000 mg/L 200 04/29/2014 10:16

Inorganic Metals EPA 200.8 Analyst: RLM

 Selenium, dissolved 0.203 0.001 mg/L 1 05/03/2014 12:10

Inorganic Metals EPA 200.8 Analyst: RLM

 Arsenic 0.002 0.001 mg/L 1 05/03/2014 12:05

 Chromium < 0.005 0.005 mg/L 1 05/03/2014 12:05

 Nickel 0.0036 0.0005 mg/L 1 05/03/2014 12:05

 Selenium 0.198 0.001 mg/L 1 05/03/2014 12:05

Inorganic Metals EPA 200.7 Analyst: JEK

 Iron, dissolved < 0.05 0.05 mg/L 1 05/01/2014 09:08

Inorganic Metals SM 3112B Analyst: JEK

 Mercury < 0.0002 0.0002 mg/L 1 04/30/2014 13:46

Inorganic Metals EPA 200.7 Analyst: JEK

 Aluminum < 0.1 0.1 mg/L 1 05/01/2014 09:06

 Beryllium < 0.001 0.001 mg/L 1 05/01/2014 09:06

 Boron 237 2.50 mg/L 50 05/02/2014 21:24

 Cadmium 0.002 0.002 mg/L 1 05/01/2014 09:06

 Copper < 0.01 0.01 mg/L 1 05/01/2014 09:06

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: G1404H01

Project: Keystone 611 W Sampled By: NRG

Lab ID: G1404H01-001 Collection Date: 04/28/2014 09:30

Matrix: Aqueous Received Date: 04/28/2014 17:43

Analyses Result QL Q Units DF Date Analyzed

Page 2 of 5
 Iron < 0.05 0.05 mg/L 1 05/01/2014 09:06

 Lead < 0.02 0.02 mg/L 1 05/01/2014 09:06

 Manganese 2.92 0.01 mg/L 1 05/01/2014 09:06

 Silver < 0.005 0.005 mg/L 1 05/01/2014 09:06

 Zinc 0.01 0.01 mg/L 1 05/01/2014 09:06

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

 Trivalent Chromium < 0.02 0.02 mg/L 1 05/05/2014 00:00

Indicator Organic Parameters EPA 1664 Analyst: NEL

 Oil & Grease < 5 5 mg/L 1.01 04/29/2014 14:29

 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: G1404H01

Project: Keystone 611 W Sampled By: NRG

Lab ID: G1404H01-001 Collection Date: 04/28/2014 09:30

Matrix: Aqueous Received Date: 04/28/2014 17:43

Analyses Result QL Q Units DF Date Analyzed

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

 Total dissolved solids 28000 200 mg/L 10 04/29/2014 15:22

Physical Tests SM 2540D Analyst: GMG

 Total suspended solids 21600 200 mg/L 40 04/29/2014 15:21

Indicator Organic Parameters SM 5210 B Analyst: HJC

 BOD 5-day 13 2 mg/L 1.5 04/30/2014 07:30

Inorganic Metals USGS I-1230-85 Analyst: MLR

 Hexavalent Chromium < 0.020 0.020 mg/L 1 04/28/2014 18:14

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

 Chloride 13700 1000 mg/L 200 04/29/2014 10:16

Inorganic Metals EPA 200.7 Analyst: JEK

 Iron, dissolved < 0.05 0.05 mg/L 1 05/01/2014 13:17

 Selenium, dissolved 0.22 0.02 mg/L 1 05/01/2014 13:17

Inorganic Metals SM 3112B Analyst: JEK

 Mercury 0.560 0.100 mg/L 500 04/30/2014 14:08

Inorganic Metals EPA 200.7 Analyst: JEK

 Aluminum 322 1.0 mg/L 1 05/02/2014 08:40

 Arsenic 2.95 0.20 mg/L 1 05/02/2014 08:40

 Beryllium 0.039 0.010 mg/L 1 05/02/2014 08:40

 Boron 292 5.00 mg/L 10 05/05/2014 18:28

 Cadmium 0.039 0.020 mg/L 1 05/02/2014 08:40

 Chromium 2.23 0.10 mg/L 1 05/02/2014 08:40

 Copper 1.44 0.10 mg/L 1 05/02/2014 08:40

 Iron 1380 0.50 mg/L 1 05/02/2014 08:40

 Lead 0.71 0.20 mg/L 1 05/02/2014 08:40

 Manganese 198 0.10 mg/L 1 05/02/2014 08:40

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: G1404H01 IWT Influent Special

Project: Keystone 611 W Sampled By: NRG

Lab ID: G1404H01-002 Collection Date: 04/28/2014 09:15

Matrix: Aqueous Received Date: 04/28/2014 17:43

Analyses Result QL Q Units DF Date Analyzed

Page 4 of 5
 Nickel 2.99 0.10 mg/L 1 05/02/2014 08:40

 Selenium 4.66 0.20 mg/L 1 05/02/2014 08:40

 Silver < 0.050 0.050 mg/L 1 05/02/2014 08:40

 Zinc 4.09 0.10 mg/L 1 05/02/2014 08:40

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

 Trivalent Chromium 2.23 0.02 mg/L 1 05/05/2014 00:00

Indicator Organic Parameters EPA 1664 Analyst: NEL

 Oil & Grease < 18 18 mg/L 3.57 04/29/2014 15:32

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: G1404H01 IWT Influent Special

Project: Keystone 611 W Sampled By: NRG

Lab ID: G1404H01-002 Collection Date: 04/28/2014 09:15

Matrix: Aqueous Received Date: 04/28/2014 17:43

Analyses Result QL Q Units DF Date Analyzed

Page 5 of 5