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

REVISED REPORT: Mercury value changed for G1402340-002. Original sample was over diluted during the

mercury preparation.

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(b) CASE NARRATIVE

Lab Order: G1402340

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 6 1 mg/L 1 02/11/2014 11:31

Inorganic Non-Metals SM 2540 C Analyst: KLS

 Total dissolved solids 28100 20 mg/L 1 02/11/2014 11:31

Indicator Organic Parameters SM 5210 B Analyst: MMR

 BOD 5-day < 2 2 mg/L 1.5 02/12/2014 07:02

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

 Chloride 16000 1000 mg/L 200 02/12/2014 14:58

Inorganic Metals EPA 200.8 Analyst: RXS

 Selenium, dissolved 0.053 0.001 mg/L 1 02/24/2014 13:30

Inorganic Metals EPA 200.8 Analyst: RXS

 Arsenic 0.004 0.001 mg/L 1 02/12/2014 17:05

 Chromium < 0.005 0.005 mg/L 1 02/12/2014 17:05

 Nickel 0.0052 0.0005 mg/L 1 02/12/2014 17:05

 Selenium 0.086 0.001 mg/L 1 02/12/2014 17:05

Inorganic Metals EPA 200.7 Analyst: GMG

 Iron, dissolved < 0.05 0.05 mg/L 1 02/11/2014 19:31

Inorganic Metals SM 3112B Analyst: RXS

 Mercury < 0.0002 0.0002 mg/L 1 02/12/2014 10:08

Inorganic Metals EPA 200.7 Analyst: GMG

 Aluminum < 0.1 0.1 mg/L 1 02/11/2014 19:29

 Beryllium < 0.001 0.001 mg/L 1 02/11/2014 19:29

 Boron 276 0.05 mg/L 1 02/11/2014 19:29

 Cadmium 0.002 0.002 mg/L 1 02/11/2014 19:29

 Copper < 0.01 0.01 mg/L 1 02/11/2014 19:29

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: G1402340

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

Lab ID: G1402340-001 Collection Date: 02/10/2014 09:15

Matrix: Aqueous Received Date: 02/10/2014 16:17

Analyses Result QL Q Units DF Date Analyzed

Page 2 of 5
 Iron < 0.05 0.05 mg/L 1 02/11/2014 19:29

 Lead < 0.02 0.02 mg/L 1 02/11/2014 19:29

 Manganese 9.41 0.01 mg/L 1 02/11/2014 19:29

 Silver < 0.005 0.005 mg/L 1 02/11/2014 19:29

 Zinc < 0.01 0.01 mg/L 1 02/11/2014 19:29

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

 Trivalent Chromium < 0.02 0.02 mg/L 1 02/21/2014 00:00

Indicator Organic Parameters EPA 1664 Analyst: MCO

 Oil & Grease < 5 5 mg/L 1 02/12/2014 16:19

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: G1402340

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

Lab ID: G1402340-001 Collection Date: 02/10/2014 09:15

Matrix: Aqueous Received Date: 02/10/2014 16:17

Analyses Result QL Q Units DF Date Analyzed

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

 Total dissolved solids 26400 100 mg/L 5 02/11/2014 11:31

Physical Tests SM 2540D Analyst: KLS

 Total suspended solids 860 100 mg/L 20 02/11/2014 11:31

Indicator Organic Parameters SM 5210 B Analyst: MMR

 BOD 5-day 9 3 mg/L 3 02/12/2014 07:02

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

 Chloride 13000 1000 mg/L 200 02/12/2014 14:58

Inorganic Metals EPA 200.7 Analyst: GMG

 Iron, dissolved < 0.05 0.05 mg/L 1 02/11/2014 19:34

 Selenium, dissolved 0.20 0.02 mg/L 1 02/11/2014 19:34

Inorganic Metals SM 3112B Analyst: RLD

 Mercury 0.0722 0.0050 mg/L 25 03/04/2014 11:36

Inorganic Metals EPA 200.7 Analyst: GMG

 Aluminum 40.0 1.0 mg/L 1 02/14/2014 22:25

 Arsenic < 0.20 0.20 mg/L 1 02/14/2014 22:25

 Beryllium < 0.010 0.010 mg/L 1 02/14/2014 22:25

 Boron 342 5.00 mg/L 10 02/17/2014 14:08

 Cadmium 0.030 0.020 mg/L 1 02/14/2014 22:25

 Chromium 0.23 0.10 mg/L 1 02/14/2014 22:25

 Copper 0.39 0.10 mg/L 1 02/14/2014 22:25

 Iron 174 0.50 mg/L 1 02/14/2014 22:25

 Lead < 0.20 0.20 mg/L 1 02/14/2014 22:25

 Manganese 227 0.10 mg/L 1 02/14/2014 22:25

 Nickel 1.43 0.10 mg/L 1 02/14/2014 22:25

 Selenium 0.81 0.20 mg/L 1 02/14/2014 22:25

 Silver < 0.050 0.050 mg/L 1 02/14/2014 22:25

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: G1402340 IWT Influent Special

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

Lab ID: G1402340-002 Collection Date: 02/10/2014 09:00

Matrix: Aqueous Received Date: 02/10/2014 16:17

Analyses Result QL Q Units DF Date Analyzed

Page 4 of 5
 Zinc 0.65 0.10 mg/L 1 02/14/2014 22:25

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

 Trivalent Chromium 0.22 0.02 mg/L 1 02/21/2014 00:00

Indicator Organic Parameters EPA 1664 Analyst: MCO

 Oil & Grease < 23 23 mg/L 4.55 02/12/2014 15:25

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: G1402340 IWT Influent Special

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

Lab ID: G1402340-002 Collection Date: 02/10/2014 09:00

Matrix: Aqueous Received Date: 02/10/2014 16:17

Analyses Result QL Q Units DF Date Analyzed

Page 5 of 5