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 M(a) CASE NARRATIVE

Lab Order: G1403113

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
Inorganic Non-Metals SM 2540 C Analyst: KLS

 Total dissolved solids 29100 100 mg/L 5 03/05/2014 10:20

Physical Tests SM 2540D Analyst: KLS

 Total suspended solids 20000 100 mg/L 20 03/05/2014 10:19

Indicator Organic Parameters SM 5210 B Analyst: MMR

 BOD 5-day 6 3 mg/L 3 03/05/2014 10:04

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

 Chloride 16800 1000 mg/L 200 03/10/2014 09:43

Inorganic Metals EPA 200.7 Analyst: GMG

 Iron, dissolved < 0.05 0.05 mg/L 1 03/05/2014 18:23

 Selenium, dissolved 0.12 0.02 mg/L 1 03/05/2014 18:23

Inorganic Metals SM 3112B Analyst: RLD

 Mercury 0.480 0.100 mg/L 500 03/10/2014 12:57

Inorganic Metals EPA 200.7 Analyst: GMG

 Aluminum 462 1.0 mg/L 1 03/05/2014 13:55

 Arsenic 2.30 0.20 mg/L 1 03/05/2014 13:55

 Beryllium 0.049 0.010 mg/L 1 03/05/2014 13:55

 Boron 370 5.00 mg/L 10 03/05/2014 14:28

 Cadmium < 0.020 0.020 mg/L 1 03/05/2014 13:55

 Chromium 2.32 0.10 mg/L 1 03/05/2014 13:55

 Copper 1.86 0.10 mg/L 1 03/05/2014 13:55

 Iron 1650 0.50 mg/L 1 03/05/2014 13:55

 Lead 0.78 0.20 mg/L 1 03/05/2014 13:55

 Manganese 344 0.10 mg/L 1 03/05/2014 13:55

 Nickel 3.21 0.10 mg/L 1 03/05/2014 13:55

 Selenium 3.49 0.20 mg/L 1 03/05/2014 13:55

 Silver < 0.050 0.050 mg/L 1 03/05/2014 13:55

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: G1403113 IWT Influent Special

Project: Keystone 611 M(a) Sampled By: Client

Lab ID: G1403113-001 Collection Date: 03/04/2014 09:00

Matrix: Aqueous Received Date: 03/04/2014 18:05

Analyses Result QL Q Units DF Date Analyzed

Page 2 of 5
 Zinc 4.27 0.10 mg/L 1 03/05/2014 13:55

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

 Trivalent Chromium 2.30 0.02 mg/L 1 03/07/2014 00:00

Indicator Organic Parameters EPA 1664 Analyst: MCO

 Oil & Grease < 18 18 mg/L 3.57 03/11/2014 14:07

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: G1403113 IWT Influent Special

Project: Keystone 611 M(a) Sampled By: Client

Lab ID: G1403113-001 Collection Date: 03/04/2014 09:00

Matrix: Aqueous Received Date: 03/04/2014 18:05

Analyses Result QL Q Units DF Date Analyzed

Page 3 of 5
Physical Tests SM 2540D Analyst: KLS

 Total suspended solids 7 1 mg/L 1 03/05/2014 10:19

Inorganic Non-Metals SM 2540 C Analyst: KLS

 Total dissolved solids 29400 20 mg/L 1 03/05/2014 10:20

Indicator Organic Parameters SM 5210 B Analyst: MMR

 BOD 5-day < 2 2 mg/L 1.5 03/05/2014 10:04

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

 Chloride 16500 1000 mg/L 200 03/10/2014 09:43

Inorganic Metals EPA 200.8 Analyst: RXS

 Selenium, dissolved 0.009 0.001 mg/L 1 03/07/2014 11:00

Inorganic Metals EPA 200.8 Analyst: RXS

 Arsenic 0.003 0.001 mg/L 1 03/06/2014 00:18

 Chromium < 0.005 0.005 mg/L 1 03/06/2014 00:18

 Nickel 0.0062 0.0005 mg/L 1 03/06/2014 00:18

 Selenium 0.051 0.005 mg/L 5 03/10/2014 12:29

Inorganic Metals EPA 200.7 Analyst: GMG

 Iron, dissolved < 0.05 0.05 mg/L 1 03/05/2014 18:13

Inorganic Metals SM 3112B Analyst: RLD

 Mercury < 0.0002 0.0002 mg/L 1 03/10/2014 12:58

Inorganic Metals EPA 200.7 Analyst: GMG

 Aluminum < 0.1 0.1 mg/L 1 03/05/2014 18:10

 Beryllium < 0.001 0.001 mg/L 1 03/05/2014 18:10

 Boron 279 2.50 mg/L 50 03/06/2014 10:47

 Cadmium 0.003 0.002 mg/L 1 03/05/2014 18:10

 Copper < 0.01 0.01 mg/L 1 03/05/2014 18:10

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: G1403113

Project: Keystone 611 M(a) Sampled By: Client

Lab ID: G1403113-002 Collection Date: 03/04/2014 09:15

Matrix: Aqueous Received Date: 03/04/2014 18:05

Analyses Result QL Q Units DF Date Analyzed

Page 4 of 5
 Iron < 0.05 0.05 mg/L 1 03/05/2014 18:10

 Lead < 0.02 0.02 mg/L 1 03/05/2014 18:10

 Manganese 22.4 0.01 mg/L 1 03/05/2014 18:10

 Silver < 0.005 0.005 mg/L 1 03/05/2014 18:10

 Zinc < 0.01 0.01 mg/L 1 03/05/2014 18:10

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

 Trivalent Chromium < 0.02 0.02 mg/L 1 03/07/2014 00:00

Indicator Organic Parameters EPA 1664 Analyst: MCO

 Oil & Grease < 5 5 mg/L 1.02 03/11/2014 13:48

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: G1403113

Project: Keystone 611 M(a) Sampled By: Client

Lab ID: G1403113-002 Collection Date: 03/04/2014 09:15

Matrix: Aqueous Received Date: 03/04/2014 18:05

Analyses Result QL Q Units DF Date Analyzed

Page 5 of 5