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: Permit Renewal CASE NARRATIVE

Lab Order: G1204400

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 7
Inorganic Non-Metals SM 2540 C Analyst: KLS

 Total dissolved solids 34400 200 mg/L 10 04/11/2012 09:50

Physical Tests SM 2540D Analyst: KLS

 Total suspended solids 16000 100 mg/L 20 04/11/2012 09:49

Indicator Organic Parameters SM 5210 B Analyst: MMR

 BOD 5-day 17 3 mg/L 3 04/11/2012 10:45

 Finish Date/Time 4/16/2012

10:10 0 mg/L 3 04/11/2012 10:45

Inorganic Non Metals SM 4500-CNI Analyst: MLR

 Cyanide, free 79 10 μg/L 1 04/12/2012 13:41

Inorganic Non Metals SM 4500-CN-C&E Analyst: MLR

 Cyanide, total 98 10 μg/L 1 04/11/2012 13:47

Indicator Organic Parameters HACH 8000 Analyst: SEM

 Chemical Oxygen Demand 1100 100 mg/L 10 04/12/2012 15:45

Physical Tests SM 2120C Analyst: MLS

 Color 22 10 Color Units 1 04/10/2012 19:35

Inorganic Non Metals USGS I-1230-85 Analyst: SAG

 Hexavalent Chromium 37 20 μg/L 1 04/10/2012 19:45

Inorganic Non-Metals EPA 300.0 Analyst: CAS

 Bromide 202 5.0 mg/L 25 04/16/2012 19:05

 Fluoride 4.5 1.0 mg/L 10 04/12/2012 22:20

 Sulfate 1230 20 mg/L 10 04/12/2012 22:20

Inorganic Non-Metals SM 5540C Analyst: SEM

 MBAS 0.5 0.50 mg/L as 10 04/11/2012 10:40

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: 101 Inf

Lab Order: G1204400

Project: Permit Renewal Sampled By: Client

Lab ID: G1204400-001 Collection Date: 04/10/2012 10:00

Matrix: Aqueous Received Date: 04/10/2012 18:07

Analyses Result QL Q Units DF Date Analyzed

Page 2 of 7
LAS

Inorganic Non-Metals EPA 350.1 Analyst: SLY

 Ammonia Nitrogen - Distilled 7.48 0.50 mg/L as N 5 04/12/2012 14:21

Inorganic Non-Metals EPA 353.2 Analyst: SLY

 Nitrate - Nitrite 30.5 0.50 mg/L as N 10 04/16/2012 11:34

Inorganic Non-Metals SM 4500-P B.5 E Analyst: SEM

 Phosphorus, total 15 10 mg/L as P 100 04/12/2012 14:49

Indicator Organic Parameters EPA 420.1 Analyst: MLR

 Phenolics 10.0 20.0 μg/L 1 04/12/2012 11:25

Inorganic Non Metals SM 4500 S D Analyst: KMW

 Sulfide 0.050 0.1 mg/L 1 04/12/2012 15:30

Inorganic Non Metals SM 4500-SO3 B Analyst: MLS

 Lab Sulfite 90 20 mg/L 10 04/10/2012 19:22

Inorganic Non-Metals EPA 351.2 Analyst: SLY

 Total Kjeldahl Nitrogen 54.6 5.0 mg/L as N 5 04/17/2012 09:07

Inorganic Metals SM 3112B Analyst: JEK

 Mercury 650 100 μg/L 500 04/12/2012 11:04

Inorganic Metals EPA 200.7 Analyst: MBG

 Aluminum 252000 1000 μg/L 1 04/14/2012 19:58

 Antimony 100 200 μg/L 1 04/14/2012 19:58

 Arsenic 1390 200 μg/L 1 04/14/2012 19:58

 Barium 22000 100 μg/L 1 04/14/2012 19:58

 Beryllium 41.0 10.0 μg/L 1 04/14/2012 19:58

 Boron 304000 5000 μg/L 10 04/16/2012 15:50

 Cadmium 11 20.0 μg/L 1 04/14/2012 19:58

 Calcium 6750000 10000 μg/L 10 04/16/2012 15:50

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: 101 Inf

Lab Order: G1204400

Project: Permit Renewal Sampled By: Client

Lab ID: G1204400-001 Collection Date: 04/10/2012 10:00

Matrix: Aqueous Received Date: 04/10/2012 18:07

Analyses Result QL Q Units DF Date Analyzed

Page 3 of 7
 Chromium 1740 100 μg/L 1 04/14/2012 19:58

 Cobalt 541 50.0 μg/L 1 04/14/2012 19:58

 Copper 1490 100 μg/L 1 04/14/2012 19:58

 Iron 1590000 500 μg/L 1 04/14/2012 19:58

 Lead 578 200 μg/L 1 04/14/2012 19:58

 Magnesium 2450000 10000 μg/L 10 04/16/2012 15:50

 Manganese 281000 100 μg/L 1 04/14/2012 19:58

 Molybdenum 428 200 μg/L 1 04/14/2012 19:58

 Nickel 4350 100 μg/L 1 04/14/2012 19:58

 Selenium 3220 200 μg/L 1 04/14/2012 19:58

 Silver 20.0 50.0 μg/L 1 04/14/2012 19:58

 Thallium 200 200 μg/L 1 04/14/2012 19:58

 Tin 500 1000 μg/L 1 04/14/2012 19:58

 Titanium 3820 50.0 μg/L 1 04/14/2012 19:58

 Zinc 3700 100 μg/L 1 04/14/2012 19:58

 Hardness (SM 2340B) 27000000 100000 μg/L 10 04/16/2012 15:50

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

 Trivalent Chromium 1700000 20.0 μg/L 1 04/27/2012 00:00

Inorganic Metals EPA 200.7 Analyst: GMG

 Iron, dissolved 50.0 250 μg/L 5 04/16/2012 15:48

Semi-Volatile Compounds EPA 625 Analyst: NPT

 1,2,4-Trichlorobenzene 20 40 μg/L 4 04/19/2012 01:48

 1,2-Dichlorobenzene 20 40 μg/L 4 04/19/2012 01:48

 1,3-Dichlorobenzene 20 40 μg/L 4 04/19/2012 01:48

 1,4-Dichlorobenzene 20 40 μg/L 4 04/19/2012 01:48

 2,4,6-Trichlorophenol 20 40 μg/L 4 04/19/2012 01:48

 2,4-Dichlorophenol 20 40 μg/L 4 04/19/2012 01:48

 2,4-Dimethylphenol 20 40 μg/L 4 04/19/2012 01:48

 2,4-Dinitrophenol 20 200 μg/L 4 04/19/2012 01:48

 2,4-Dinitrotoluene 20 40 μg/L 4 04/19/2012 01:48

 2,6-Dinitrotoluene 20 40 μg/L 4 04/19/2012 01:48

 2-Chloro-Naphthalene 20 40 μg/L 4 04/19/2012 01:48

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: 101 Inf

Lab Order: G1204400

Project: Permit Renewal Sampled By: Client

Lab ID: G1204400-001 Collection Date: 04/10/2012 10:00

Matrix: Aqueous Received Date: 04/10/2012 18:07

Analyses Result QL Q Units DF Date Analyzed

Page 4 of 7
 2-Chlorophenol 20 40 μg/L 4 04/19/2012 01:48

 2-Methyl-4,6-dinitrophenol 20 200 μg/L 4 04/19/2012 01:48

 2-Nitrophenol 20 40 μg/L 4 04/19/2012 01:48

 3,3-Dichlorobenzidine 20 200 μg/L 4 04/19/2012 01:48

 4-Bromophenylphenylether 20 40 μg/L 4 04/19/2012 01:48

 4-Chloro-3-methylphenol 20 40 μg/L 4 04/19/2012 01:48

 4-Chlorophenylphenylether 20 40 μg/L 4 04/19/2012 01:48

 4-Nitrophenol 20 200 μg/L 4 04/19/2012 01:48

 Acenaphthene 20 40 μg/L 4 04/19/2012 01:48

 Acenaphthylene 20 40 μg/L 4 04/19/2012 01:48

 Anthracene 20 40 μg/L 4 04/19/2012 01:48

 Azobenzene 20 40 μg/L 4 04/19/2012 01:48

 Benzidine 20 40 μg/L 4 04/19/2012 01:48

 Benzo(a)anthracene 20 40 μg/L 4 04/19/2012 01:48

 Benzo(a)pyrene 20 40 μg/L 4 04/19/2012 01:48

 Benzo(b)fluoranthene 20 40 μg/L 4 04/19/2012 01:48

 Benzo(g,h,i)perylene 20 40 μg/L 4 04/19/2012 01:48

 Benzo(k)fluoranthene 20 40 μg/L 4 04/19/2012 01:48

 bis(2-Chloroethoxy)methane 20 40 μg/L 4 04/19/2012 01:48

 bis(2-Chloroethyl)ether 20 40 μg/L 4 04/19/2012 01:48

 bis(2-Chloroisopropyl)ether 20 40 μg/L 4 04/19/2012 01:48

 bis(2-Ethylhexyl)phthalate 8.0 20 μg/L 4 04/19/2012 01:48

 Butyl benzylphthalate 20 40 μg/L 4 04/19/2012 01:48

 Chrysene 20 40 μg/L 4 04/19/2012 01:48

 Di-N-Butyl Phthalate 20 40 μg/L 4 04/19/2012 01:48

 Di-N-Octylphthalate 20 40 μg/L 4 04/19/2012 01:48

 Di-n-propylnitrosamine 20 40 μg/L 4 04/19/2012 01:48

 Dibenzo(a,h)anthracene 20 40 μg/L 4 04/19/2012 01:48

 Diethyl Phthalate 20 40 μg/L 4 04/19/2012 01:48

 Dimethyl Phthalate 20 40 μg/L 4 04/19/2012 01:48

 Fluoranthene 20 40 μg/L 4 04/19/2012 01:48

 Fluorene 20 40 μg/L 4 04/19/2012 01:48

 Hexachlorobenzene 20 40 μg/L 4 04/19/2012 01:48

 Hexachlorobutadiene 20 40 μg/L 4 04/19/2012 01:48

 Hexachlorocyclopentadiene 20 200 μg/L 4 04/19/2012 01:48

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: 101 Inf

Lab Order: G1204400

Project: Permit Renewal Sampled By: Client

Lab ID: G1204400-001 Collection Date: 04/10/2012 10:00

Matrix: Aqueous Received Date: 04/10/2012 18:07

Analyses Result QL Q Units DF Date Analyzed

Page 5 of 7
 Hexachloroethane 20 40 μg/L 4 04/19/2012 01:48

 Indeno(1,2,3-cd)pyrene 20 40 μg/L 4 04/19/2012 01:48

 Isophorone 8.0 20 μg/L 4 04/19/2012 01:48

 n-Nitrosodimethylamine 20 40 μg/L 4 04/19/2012 01:48

 n-Nitrosodiphenylamine 40 80 μg/L 4 04/19/2012 01:48

 Naphthalene 20 40 μg/L 4 04/19/2012 01:48

 Nitrobenzene 20 40 μg/L 4 04/19/2012 01:48

 Pentachlorophenol 20 200 μg/L 4 04/19/2012 01:48

 Phenanthrene 20 40 μg/L 4 04/19/2012 01:48

 Phenol 20 40 μg/L 4 04/19/2012 01:48

 Pyrene 20 40 μg/L 4 04/19/2012 01:48

 TIC: 2-[2-[2-[2-[2-(2-Methoxyethoxy)eth NA 16 μg/L 4 04/19/2012 01:48

 TIC: 3-Pentanol, 3-ethyl- NA 16 μg/L 4 04/19/2012 01:48

 TIC: Chloroiodomethane NA 16 μg/L 4 04/19/2012 01:48

 TIC: Ethanol, 2-(2-ethoxyethoxy)- NA 16 μg/L 4 04/19/2012 01:48

 TIC: Methane, bromodichloro- NA 16 μg/L 4 04/19/2012 01:48

 TIC: Pentane, 1-chloro-5-iodo- NA 16 μg/L 4 04/19/2012 01:48

Volatile Organic Compounds EPA 624 Analyst: SJM

 1,1,1-Trichloroethane 0.200 0.5 μg/L 1 04/11/2012 14:45

 1,1,2,2-Tetrachloroethane 0.200 0.5 μg/L 1 04/11/2012 14:45

 1,1,2-Trichloroethane 0.500 1.0 μg/L 1 04/11/2012 14:45

 1,1-Dichloroethane 0.200 0.5 μg/L 1 04/11/2012 14:45

 1,1-Dichloroethene 0.200 0.5 μg/L 1 04/11/2012 14:45

 1,2-Dichloroethane 0.200 0.5 μg/L 1 04/11/2012 14:45

 1,2-Dichloropropane 0.200 0.5 μg/L 1 04/11/2012 14:45

 2-Chloroethylvinyl ether 0.500 1.0 μg/L 1 04/11/2012 14:45

 Benzene 0.200 0.5 μg/L 1 04/11/2012 14:45

 Bromoform 0.200 0.5 μg/L 1 04/11/2012 14:45

 Bromomethane 0.500 1.0 μg/L 1 04/11/2012 14:45

 Carbon Tetrachloride 0.200 0.5 μg/L 1 04/11/2012 14:45

 Chlorobenzene 0.200 0.5 μg/L 1 04/11/2012 14:45

 Chlorodibromomethane 0.400 1.0 μg/L 1 04/11/2012 14:45

 Chloroethane 0.200 0.5 μg/L 1 04/11/2012 14:45

 Chloroform 0.200 0.5 μg/L 1 04/11/2012 14:45

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: 101 Inf

Lab Order: G1204400

Project: Permit Renewal Sampled By: Client

Lab ID: G1204400-001 Collection Date: 04/10/2012 10:00

Matrix: Aqueous Received Date: 04/10/2012 18:07

Analyses Result QL Q Units DF Date Analyzed

Page 6 of 7
 Chloromethane 0.200 0.5 μg/L 1 04/11/2012 14:45

 Dichlorobromomethane 0.200 0.5 μg/L 1 04/11/2012 14:45

 Ethylbenzene 0.200 0.5 μg/L 1 04/11/2012 14:45

 Methylene Chloride 0.200 0.5 μg/L 1 04/11/2012 14:45

 Tetrachloroethene 0.200 0.5 μg/L 1 04/11/2012 14:45

 Toluene 0.200 0.5 μg/L 1 04/11/2012 14:45

 trans-1,2-Dichloroethene 0.500 1.0 μg/L 1 04/11/2012 14:45

 Trichloroethene 0.200 0.5 μg/L 1 04/11/2012 14:45

 Vinyl Chloride 0.200 0.5 μg/L 1 04/11/2012 14:45

 1,3-Dichloropropylene 0.200 0.5 μg/L 1 04/11/2012 14:45

 TIC: Methyl Ethyl Ketone. NA 3.0 1 04/11/2012 14:45

 TIC: Tetrahydrofuran. NA 3.0 1 04/11/2012 14:45

Volatile Organic Compounds EPA 624 Analyst: SJM

 Acrolein 2.00 5.00 μg/L 1 04/11/2012 14:45

 Acrylonitrile 0.500 1.00 μg/L 1 04/11/2012 14:45

Indicator Organic Parameters EPA 1664 Analyst: AMS

 Oil & Grease 2.06 5 mg/L 1.03 04/17/2012 07:23

Indicator Organic Parameters SM 20 5310-C Analyst: ACG

 Total Organic Carbon 3.7 0.5 mg/L 1 04/12/2012 19:54

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: 101 Inf

Lab Order: G1204400

Project: Permit Renewal Sampled By: Client

Lab ID: G1204400-001 Collection Date: 04/10/2012 10:00

Matrix: Aqueous Received Date: 04/10/2012 18:07

Analyses Result QL Q Units DF Date Analyzed

Page 7 of 7