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 W CASE NARRATIVE

Lab Order: G1402614

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: MBG

 Total suspended solids < 1 1 mg/L 1 02/18/2014 13:08

Inorganic Non-Metals SM 2540 C Analyst: MBG

 Total dissolved solids 29200 100 mg/L 5 02/18/2014 16:24

Indicator Organic Parameters SM 5210 B Analyst: MMR

 BOD 5-day < 2 2 mg/L 1.5 02/19/2014 08:15

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

 Chloride 15400 1000 mg/L 200 02/18/2014 13:09

Inorganic Metals EPA 200.8 Analyst: RXS

 Selenium, dissolved 0.048 0.005 mg/L 5 03/03/2014 12:30

Inorganic Metals EPA 200.8 Analyst: RXS

 Arsenic 0.002 0.001 mg/L 1 02/18/2014 21:27

 Chromium < 0.005 0.005 mg/L 1 02/18/2014 21:27

 Nickel 0.0048 0.0005 mg/L 1 02/18/2014 21:27

 Selenium 0.075 0.001 mg/L 1 02/18/2014 21:27

Inorganic Metals EPA 200.7 Analyst: GMG

 Iron, dissolved < 0.05 0.05 mg/L 1 02/19/2014 13:39

Inorganic Metals SM 3112B Analyst: RLD

 Mercury < 0.0002 0.0002 mg/L 1 02/20/2014 09:02

Inorganic Metals EPA 200.7 Analyst: GMG

 Aluminum < 0.1 0.1 mg/L 1 02/19/2014 13:37

 Beryllium < 0.001 0.001 mg/L 1 02/19/2014 13:37

 Boron 289 2.50 mg/L 50 02/20/2014 11:46

 Cadmium 0.003 0.002 mg/L 1 02/19/2014 13:37

 Copper < 0.01 0.01 mg/L 1 02/19/2014 13:37

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: G1402614

Project: Keystone 611 W Sampled By: NRG

Lab ID: G1402614-001 Collection Date: 02/17/2014 09:15

Matrix: Aqueous Received Date: 02/17/2014 16:30

Analyses Result QL Q Units DF Date Analyzed

Page 2 of 5
 Iron < 0.05 0.05 mg/L 1 02/19/2014 13:37

 Lead < 0.02 0.02 mg/L 1 02/19/2014 13:37

 Manganese 22.0 0.01 mg/L 1 02/19/2014 13:37

 Silver < 0.005 0.005 mg/L 1 02/19/2014 13:37

 Zinc < 0.01 0.01 mg/L 1 02/19/2014 13:37

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 S mg/L 1.01 02/18/2014 17:48

 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: G1402614

Project: Keystone 611 W Sampled By: NRG

Lab ID: G1402614-001 Collection Date: 02/17/2014 09:15

Matrix: Aqueous Received Date: 02/17/2014 16:30

Analyses Result QL Q Units DF Date Analyzed

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

 Total dissolved solids 31900 100 mg/L 5 02/18/2014 16:24

Physical Tests SM 2540D Analyst: MBG

 Total suspended solids 28400 100 mg/L 20 02/18/2014 13:08

Indicator Organic Parameters SM 5210 B Analyst: MMR

 BOD 5-day 15 6 mg/L 6 02/19/2014 08:15

Inorganic Metals USGS I-1230-85 Analyst: MLR

 Hexavalent Chromium < 0.020 0.020 mg/L 1 02/17/2014 17:15

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

 Chloride 15600 1000 mg/L 200 02/18/2014 13:09

Inorganic Metals EPA 200.7 Analyst: GMG

 Iron, dissolved < 0.05 0.05 mg/L 1 02/19/2014 13:42

 Selenium, dissolved 0.07 0.02 mg/L 1 02/19/2014 13:42

Inorganic Metals SM 3112B Analyst: RLD

 Mercury 0.685 0.100 mg/L 500 02/20/2014 09:03

Inorganic Metals EPA 200.7 Analyst: GMG

 Aluminum 402 1.0 mg/L 1 02/26/2014 16:49

 Arsenic 2.75 0.20 mg/L 1 02/26/2014 16:49

 Beryllium 0.057 0.010 mg/L 1 02/26/2014 16:49

 Boron 377 5.00 mg/L 10 02/27/2014 14:05

 Cadmium 0.036 0.020 mg/L 1 02/26/2014 16:49

 Chromium 2.78 0.10 mg/L 1 02/26/2014 16:49

 Copper 1.77 0.10 mg/L 1 02/26/2014 16:49

 Iron 1960 0.50 mg/L 1 02/26/2014 16:49

 Lead 1.06 0.20 mg/L 1 02/26/2014 16:49

 Manganese 335 0.10 mg/L 1 02/26/2014 16:49

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: G1402614 IWT Influent Special

Project: Keystone 611 W Sampled By: NRG

Lab ID: G1402614-002 Collection Date: 02/17/2014 09:00

Matrix: Aqueous Received Date: 02/17/2014 16:30

Analyses Result QL Q Units DF Date Analyzed

Page 4 of 5
 Nickel 4.26 0.10 mg/L 1 02/26/2014 16:49

 Selenium 4.45 0.20 mg/L 1 02/26/2014 16:49

 Silver < 0.050 0.050 mg/L 1 02/26/2014 16:49

 Zinc 5.62 0.10 mg/L 1 02/26/2014 16:49

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

 Trivalent Chromium 2.78 0.02 mg/L 1 02/28/2014 00:00

Indicator Organic Parameters EPA 1664 Analyst: MCO

 Oil & Grease < 18 18 mg/L 3.57 02/18/2014 16:38

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: G1402614 IWT Influent Special

Project: Keystone 611 W Sampled By: NRG

Lab ID: G1402614-002 Collection Date: 02/17/2014 09:00

Matrix: Aqueous Received Date: 02/17/2014 16:30

Analyses Result QL Q Units DF Date Analyzed

Page 5 of 5