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

REVISED REPORT: Due to a calculation error, the trivalent chromium value changed.

Note: This is a reissue of a previously generated report. Information herein supersedes that of previously

issued report(s).

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 Q(b) CASE NARRATIVE

Lab Order: G1403389

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 3
Inorganic Non-Metals SM 2540 C Analyst: KLS

 Total dissolved solids 29800 100 mg/L 5 03/11/2014 12:46

Physical Tests SM 2540D Analyst: KLS

 Total suspended solids 9740 100 mg/L 20 03/11/2014 12:45

Indicator Organic Parameters SM 5210 B Analyst: MMR

 BOD 5-day 17 3 mg/L 3 03/12/2014 06:26

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

 Chloride 18500 1000 mg/L 200 03/17/2014 12:23

Inorganic Metals EPA 200.7 Analyst: GMG

 Iron, dissolved < 0.05 0.05 mg/L 1 03/13/2014 19:44

 Selenium, dissolved 0.04 0.02 mg/L 1 03/13/2014 19:44

Inorganic Metals SM 3112B Analyst: RXS

 Mercury 0.285 0.100 mg/L 500 03/17/2014 12:58

Inorganic Metals EPA 200.7 Analyst: GMG

 Aluminum 200 1.0 mg/L 1 03/17/2014 23:32

 Arsenic 1.46 0.20 mg/L 1 03/17/2014 23:32

 Beryllium 0.032 0.010 mg/L 1 03/17/2014 23:32

 Boron 376 5.00 mg/L 10 03/18/2014 15:50

 Cadmium 0.035 0.020 mg/L 1 03/17/2014 23:32

 Chromium 1.46 0.10 mg/L 1 03/17/2014 23:32

 Copper 1.48 0.10 mg/L 1 03/17/2014 23:32

 Iron 973 0.50 mg/L 1 03/17/2014 23:32

 Lead 0.60 0.20 mg/L 1 03/17/2014 23:32

 Manganese 322 0.10 mg/L 1 03/17/2014 23:32

 Nickel 2.91 0.10 mg/L 1 03/17/2014 23:32

 Selenium 2.31 0.20 mg/L 1 03/17/2014 23:32

 Silver < 0.050 0.050 mg/L 1 03/17/2014 23:32

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: G1403389 IWT Influent Special

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

Lab ID: G1403389-001 Collection Date: 03/10/2014 09:00

Matrix: Aqueous Received Date: 03/10/2014 17:28

Analyses Result QL Q Units DF Date Analyzed

Page 2 of 3
 Zinc 3.10 0.10 mg/L 1 03/17/2014 23:32

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

 Trivalent Chromium 1.45 0.02 mg/L 1 03/21/2014 00:00

Indicator Organic Parameters EPA 1664 Analyst: MTM

 Oil & Grease < 18 18 mg/L 3.57 03/18/2014 14:33

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: G1403389 IWT Influent Special

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

Lab ID: G1403389-001 Collection Date: 03/10/2014 09:00

Matrix: Aqueous Received Date: 03/10/2014 17:28

Analyses Result QL Q Units DF Date Analyzed

Page 3 of 3