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

Some analysis was run out of hold time as per client request.

Geochemical is not currently NELAC certified for bismuth, cesium, germanium, rhodium, scandium, terbium

and tungsten.

2005 N. Center Ave.

Somerset PA 15501

814-443-1671

814-445-6666

FAX:814-445-6729

Client: GenOn ENERGY INC. - KEYSTONE STATION

Project: DEP Split Analysis CASE NARRATIVE

Lab Order: G1302B37

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 9
Inorganic Non-Metals EPA 300.0 Analyst: MLR

 Nitrate Nitrogen 1.70 0.05 mg/L as N 1 02/28/2013 09:31

 Nitrite Nitrogen 0.05 0.05 mg/L as N 1 02/28/2013 09:31

Inorganic Non-Metals EPA 300.0 Analyst: MLR

 Bromide 0.8 0.1 mg/L 1 02/28/2013 09:31

 Chloride 83 1 mg/L 1 02/28/2013 09:31

 Fluoride 0.2 0.1 mg/L 1 02/28/2013 09:31

 Sulfate 296 2 mg/L 1 02/28/2013 09:31

Inorganic Non-Metals EPA 350.1 Analyst: SLY

 Ammonia Nitrogen 6.32 0.50 mg/L as N 5 02/28/2013 09:49

Inorganic Non-Metals SM 4500-P E Analyst: HJC

 Ortho Phosphate 0.31 0.10 mg/L as P 1 02/28/2013 09:54

Inorganic Metals EPA 6020 Analyst: JEK

 Antimony < 1.0 1.0 μg/L 1 03/01/2013 11:08

 Arsenic 5.4 1.0 μg/L 1 03/01/2013 11:08

 Bismuth < 0.2 0.2 μg/L 1 03/05/2013 14:24

 Cadmium < 0.2 0.2 μg/L 1 03/01/2013 11:08

 Cesium < 1.0 1.0 μg/L 1 03/04/2013 09:57

 Chromium < 5.0 5.0 μg/L 1 03/01/2013 11:08

 Copper 2.5 1.0 μg/L 1 03/05/2013 14:24

 Germanium < 1.0 1.0 μg/L 1 03/04/2013 09:57

 Lead < 1.0 1.0 μg/L 1 03/01/2013 11:08

 Nickel 21.0 0.5 μg/L 1 03/01/2013 11:08

 Rhodium < 1.0 1.0 μg/L 1 03/04/2013 09:57

 Scandium 1.8 1.0 μg/L 1 03/04/2013 09:57

 Selenium < 1.0 1.0 μg/L 1 03/07/2013 12:22

 Silver < 0.2 0.2 μg/L 1 03/05/2013 14:24

 Terbium < 1.0 1.0 μg/L 1 03/04/2013 09:57

 Thallium 0.2 0.2 μg/L 1 03/01/2013 11:08

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 003

Lab Order: G1302B37

Project: DEP Split Analysis Sampled By: Client

Lab ID: G1302B37-001 Collection Date: 02/21/2013 11:15

Matrix: Aqueous Received Date: 02/28/2013 06:22

Analyses Result QL Q Units DF Date Analyzed

Page 2 of 9
 Tungsten < 1.0 1.0 μg/L 1 03/04/2013 09:57

 Uranium < 1.0 1.0 μg/L 1 03/01/2013 11:08

Inorganic Metals EPA 200.7 Analyst: MAS

 Aluminum 0.2 0.1 mg/L 1 03/01/2013 11:03

 Barium 0.08 0.01 mg/L 1 03/01/2013 11:03

 Beryllium < 0.001 0.001 mg/L 1 03/01/2013 11:03

 Boron 0.70 0.05 mg/L 1 03/01/2013 11:03

 Calcium 86.3 0.1 mg/L 1 03/01/2013 11:03

 Cobalt < 0.005 0.005 mg/L 1 03/01/2013 11:03

 Lithium 0.15 0.01 mg/L 1 03/01/2013 11:03

 Magnesium 22.4 0.1 mg/L 1 03/01/2013 11:03

 Manganese 0.52 0.01 mg/L 1 03/01/2013 11:03

 Molybdenum 0.04 0.02 mg/L 1 03/01/2013 11:03

 Phosphorus 0.4 0.1 mg/L 1 03/01/2013 11:03

 Potassium 8.8 0.5 mg/L 1 03/01/2013 11:03

 Silicon 6.0 1.0 mg/L 1 03/01/2013 11:03

 Sodium 108 0.2 mg/L 1 03/01/2013 11:03

 Strontium 0.78 0.01 mg/L 1 03/01/2013 11:03

 Sulfur 104 1 mg/L 1 03/01/2013 11:03

 Tin < 0.10 0.10 mg/L 1 03/01/2013 11:03

 Titanium < 0.005 0.005 mg/L 1 03/01/2013 11:03

 Vanadium < 0.005 0.005 mg/L 1 03/01/2013 11:03

 Zinc < 0.01 0.01 mg/L 1 03/01/2013 11:03

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 003

Lab Order: G1302B37

Project: DEP Split Analysis Sampled By: Client

Lab ID: G1302B37-001 Collection Date: 02/21/2013 11:15

Matrix: Aqueous Received Date: 02/28/2013 06:22

Analyses Result QL Q Units DF Date Analyzed

Page 3 of 9
Inorganic Non-Metals EPA 300.0 Analyst: MLR

 Nitrate Nitrogen 1.88 0.05 mg/L as N 1 02/28/2013 10:22

 Nitrite Nitrogen < 0.05 0.05 mg/L as N 1 02/28/2013 10:22

Inorganic Non-Metals EPA 300.0 Analyst: MLR

 Bromide 0.8 0.1 mg/L 1 02/28/2013 10:22

 Chloride 80 1 mg/L 1 02/28/2013 10:22

 Fluoride 0.3 0.1 mg/L 1 02/28/2013 10:22

 Sulfate 153 2 mg/L 1 02/28/2013 10:22

Inorganic Non-Metals EPA 350.1 Analyst: SLY

 Ammonia Nitrogen < 0.10 0.10 mg/L as N 1 02/28/2013 09:39

Inorganic Non-Metals SM 4500-P E Analyst: HJC

 Ortho Phosphate 0.39 0.10 mg/L as P 1 02/28/2013 09:54

Inorganic Metals EPA 6020 Analyst: JEK

 Antimony < 1.0 1.0 μg/L 1 03/01/2013 11:14

 Arsenic 8.5 1.0 μg/L 1 03/01/2013 11:14

 Bismuth < 0.2 0.2 μg/L 1 03/05/2013 14:29

 Cadmium < 0.2 0.2 μg/L 1 03/01/2013 11:14

 Cesium < 1.0 1.0 μg/L 1 03/04/2013 10:00

 Chromium < 5.0 5.0 μg/L 1 03/01/2013 11:14

 Copper 2.4 1.0 μg/L 1 03/05/2013 14:29

 Germanium < 1.0 1.0 μg/L 1 03/04/2013 10:00

 Lead < 1.0 1.0 μg/L 1 03/01/2013 11:14

 Nickel 19.1 0.5 μg/L 1 03/01/2013 11:14

 Rhodium < 1.0 1.0 μg/L 1 03/04/2013 10:00

 Scandium 2.0 1.0 μg/L 1 03/04/2013 10:00

 Selenium < 1.0 1.0 μg/L 1 03/07/2013 12:27

 Silver < 0.2 0.2 μg/L 1 03/05/2013 14:29

 Terbium < 1.0 1.0 μg/L 1 03/04/2013 10:00

 Thallium < 0.2 0.2 μg/L 1 03/01/2013 11:14

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 503

Lab Order: G1302B37

Project: DEP Split Analysis Sampled By: Client

Lab ID: G1302B37-002 Collection Date: 02/21/2013 10:45

Matrix: Aqueous Received Date: 02/28/2013 06:22

Analyses Result QL Q Units DF Date Analyzed

Page 4 of 9
 Tungsten < 1.0 1.0 μg/L 1 03/04/2013 10:00

 Uranium < 1.0 1.0 μg/L 1 03/01/2013 11:14

Inorganic Metals EPA 200.7 Analyst: MAS

 Aluminum 0.2 0.1 mg/L 1 03/01/2013 11:08

 Barium 0.11 0.01 mg/L 1 03/01/2013 11:08

 Beryllium < 0.001 0.001 mg/L 1 03/01/2013 11:08

 Boron 0.09 0.05 mg/L 1 03/01/2013 11:08

 Calcium 66.0 0.1 mg/L 1 03/01/2013 11:08

 Cobalt < 0.005 0.005 mg/L 1 03/01/2013 11:08

 Lithium 0.03 0.01 mg/L 1 03/01/2013 11:08

 Magnesium 18.3 0.1 mg/L 1 03/01/2013 11:08

 Manganese 0.02 0.01 mg/L 1 03/01/2013 11:08

 Molybdenum < 0.02 0.02 mg/L 1 03/01/2013 11:08

 Phosphorus 0.8 0.1 mg/L 1 03/01/2013 11:08

 Potassium 6.0 0.5 mg/L 1 03/01/2013 11:08

 Silicon 7.5 1.0 mg/L 1 03/01/2013 11:08

 Sodium 72.4 0.2 mg/L 1 03/01/2013 11:08

 Strontium 0.64 0.01 mg/L 1 03/01/2013 11:08

 Sulfur 56 1 mg/L 1 03/01/2013 11:08

 Tin < 0.10 0.10 mg/L 1 03/01/2013 11:08

 Titanium < 0.005 0.005 mg/L 1 03/01/2013 11:08

 Vanadium < 0.005 0.005 mg/L 1 03/01/2013 11:08

 Zinc < 0.01 0.01 mg/L 1 03/01/2013 11:08

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 503

Lab Order: G1302B37

Project: DEP Split Analysis Sampled By: Client

Lab ID: G1302B37-002 Collection Date: 02/21/2013 10:45

Matrix: Aqueous Received Date: 02/28/2013 06:22

Analyses Result QL Q Units DF Date Analyzed

Page 5 of 9
Inorganic Non-Metals EPA 300.0 Analyst: MLR

 Nitrate Nitrogen 25.3 0.50 mg/L as N 10 02/28/2013 11:17

 Nitrite Nitrogen 1.21 0.50 mg/L as N 10 02/28/2013 11:17

Inorganic Non-Metals EPA 300.0 Analyst: MLR

 Bromide 110 1.0 mg/L 10 02/28/2013 11:17

 Chloride 10400 10 mg/L 10 02/28/2013 11:17

 Fluoride 7.2 1.0 mg/L 10 02/28/2013 11:17

 Sulfate 1320 20 mg/L 10 02/28/2013 11:17

Inorganic Non-Metals EPA 350.1 Analyst: SLY

 Ammonia Nitrogen 8.67 0.50 mg/L as N 5 02/28/2013 09:50

Inorganic Non-Metals SM 4500-P E Analyst: HJC

 Ortho Phosphate 0.17 0.10 mg/L as P 1 02/28/2013 09:54

Inorganic Metals EPA 6020 Analyst: JEK

 Antimony < 5.0 5.0 μg/L 5 03/05/2013 14:51

 Arsenic < 5.0 5.0 μg/L 5 03/05/2013 14:51

 Bismuth < 1.0 1.0 μg/L 5 03/05/2013 14:51

 Cadmium < 1.0 1.0 μg/L 5 03/05/2013 14:51

 Cesium < 5.0 5.0 μg/L 5 03/04/2013 10:07

 Chromium < 25.0 25.0 μg/L 5 03/05/2013 14:51

 Copper 19.4 5.0 μg/L 5 03/05/2013 14:51

 Germanium < 5.0 5.0 μg/L 5 03/04/2013 10:07

 Lead < 5.0 5.0 μg/L 5 03/05/2013 14:51

 Nickel 108 2.5 μg/L 5 03/05/2013 14:51

 Rhodium < 5.0 5.0 μg/L 5 03/04/2013 10:07

 Scandium < 5.0 5.0 μg/L 5 03/04/2013 10:07

 Selenium 17.3 10.0 μg/L 10 03/05/2013 14:40

 Silver < 1.0 1.0 μg/L 5 03/05/2013 14:51

 Terbium < 5.0 5.0 μg/L 5 03/04/2013 10:07

 Thallium 4.3 1.0 μg/L 5 03/05/2013 14:51

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: G1302B37

Project: DEP Split Analysis Sampled By: Client

Lab ID: G1302B37-003 Collection Date: 02/21/2013 11:45

Matrix: Aqueous Received Date: 02/28/2013 06:22

Analyses Result QL Q Units DF Date Analyzed

Page 6 of 9
 Tungsten < 5.0 5.0 μg/L 5 03/04/2013 10:07

 Uranium 22.9 5.0 μg/L 5 03/05/2013 14:51

Inorganic Metals EPA 200.7 Analyst: MAS

 Aluminum < 0.1 0.1 mg/L 1 03/01/2013 11:38

 Barium 0.20 0.01 mg/L 1 03/01/2013 11:38

 Beryllium < 0.001 0.001 mg/L 1 03/01/2013 11:38

 Boron 271 2.50 mg/L 50 03/04/2013 13:45

 Calcium 4390 2.5 mg/L 25 03/04/2013 14:23

 Cobalt < 0.005 0.005 mg/L 1 03/01/2013 11:38

 Lithium 0.51 0.01 mg/L 1 03/01/2013 11:38

 Magnesium 2970 2.5 mg/L 25 03/04/2013 14:23

 Manganese 55.7 0.10 mg/L 10 03/04/2013 14:26

 Molybdenum 0.04 0.02 mg/L 1 03/01/2013 11:38

 Phosphorus 1.4 0.1 mg/L 1 03/01/2013 11:38

 Potassium 67.3 0.5 mg/L 1 03/01/2013 11:38

 Silicon 1.2 1.0 mg/L 1 03/01/2013 11:38

 Sodium 229 0.2 mg/L 1 03/01/2013 11:38

 Strontium 40.7 0.10 mg/L 10 03/04/2013 14:26

 Sulfur 1210 10 mg/L 10 03/04/2013 14:26

 Tin < 0.10 0.10 mg/L 1 03/01/2013 11:38

 Titanium < 0.005 0.005 mg/L 1 03/01/2013 11:38

 Vanadium 0.010 0.005 mg/L 1 03/01/2013 11:38

 Zinc < 0.01 0.01 mg/L 1 03/01/2013 11:38

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: Outfall 101

Lab Order: G1302B37

Project: DEP Split Analysis Sampled By: Client

Lab ID: G1302B37-003 Collection Date: 02/21/2013 11:45

Matrix: Aqueous Received Date: 02/28/2013 06:22

Analyses Result QL Q Units DF Date Analyzed

Page 7 of 9
Inorganic Non-Metals EPA 300.0 Analyst: MLR

 Nitrate Nitrogen 0.66 0.05 mg/L as N 1 02/28/2013 11:34

 Nitrite Nitrogen < 0.05 0.05 mg/L as N 1 02/28/2013 11:34

Inorganic Non-Metals EPA 300.0 Analyst: MLR

 Bromide 1.0 0.1 mg/L 1 02/28/2013 11:34

 Chloride 89 1 mg/L 1 02/28/2013 11:34

 Fluoride < 0.1 0.1 mg/L 1 02/28/2013 11:34

 Sulfate 64 2 mg/L 1 02/28/2013 11:34

Inorganic Non-Metals EPA 350.1 Analyst: SLY

 Ammonia Nitrogen < 0.10 0.10 mg/L as N 1 02/28/2013 09:42

Inorganic Non-Metals SM 4500-P E Analyst: HJC

 Ortho Phosphate < 0.10 0.10 mg/L as P 1 02/28/2013 09:54

 NOTES:

 S - Spike recovery indicates a possible matrix effect. The

method is in control as indicated by the LCS.

Inorganic Metals EPA 6020 Analyst: JEK

 Antimony < 1.0 1.0 μg/L 1 03/01/2013 11:19

 Arsenic < 1.0 1.0 μg/L 1 03/01/2013 11:19

 Bismuth < 0.2 0.2 μg/L 1 03/05/2013 14:35

 Cadmium < 0.2 0.2 μg/L 1 03/01/2013 11:19

 Cesium < 1.0 1.0 μg/L 1 03/04/2013 10:03

 Chromium < 5.0 5.0 μg/L 1 03/01/2013 11:19

 Copper < 1.0 1.0 μg/L 1 03/05/2013 14:35

 Germanium < 1.0 1.0 μg/L 1 03/04/2013 10:03

 Lead < 1.0 1.0 μg/L 1 03/01/2013 11:19

 Nickel 4.3 0.5 μg/L 1 03/01/2013 11:19

 Rhodium < 1.0 1.0 μg/L 1 03/04/2013 10:03

 Scandium < 1.0 1.0 μg/L 1 03/04/2013 10:03

 Selenium < 1.0 1.0 μg/L 1 03/07/2013 12:33

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: Crooked creek

Lab Order: G1302B37

Project: DEP Split Analysis Sampled By: Client

Lab ID: G1302B37-004 Collection Date: 02/21/2013 12:00

Matrix: Aqueous Received Date: 02/28/2013 06:22

Analyses Result QL Q Units DF Date Analyzed

Page 8 of 9
 Silver < 0.2 0.2 μg/L 1 03/05/2013 14:35

 Terbium < 1.0 1.0 μg/L 1 03/04/2013 10:03

 Thallium < 0.2 0.2 μg/L 1 03/01/2013 11:19

 Tungsten < 1.0 1.0 μg/L 1 03/04/2013 10:03

 Uranium < 1.0 1.0 μg/L 1 03/01/2013 11:19

Inorganic Metals EPA 200.7 Analyst: MAS

 Aluminum 0.2 0.1 mg/L 1 03/01/2013 11:12

 Barium 0.04 0.01 mg/L 1 03/01/2013 11:12

 Beryllium < 0.001 0.001 mg/L 1 03/01/2013 11:12

 Boron < 0.05 0.05 mg/L 1 03/01/2013 11:12

 Calcium 27.6 0.1 mg/L 1 03/01/2013 11:12

 Cobalt < 0.005 0.005 mg/L 1 03/01/2013 11:12

 Lithium < 0.01 0.01 mg/L 1 03/01/2013 11:12

 Magnesium 7.6 0.1 mg/L 1 03/01/2013 11:12

 Manganese 0.18 0.01 mg/L 1 03/01/2013 11:12

 Molybdenum < 0.02 0.02 mg/L 1 03/01/2013 11:12

 Phosphorus < 0.1 0.1 mg/L 1 03/01/2013 11:12

 Potassium 1.7 0.5 mg/L 1 03/01/2013 11:12

 Silicon 2.9 1.0 mg/L 1 03/01/2013 11:12

 Sodium 31.9 0.2 mg/L 1 03/01/2013 11:12

 Strontium 0.27 0.01 mg/L 1 03/01/2013 11:12

 Sulfur 21 1 mg/L 1 03/01/2013 11:12

 Tin < 0.10 0.10 mg/L 1 03/01/2013 11:12

 Titanium < 0.005 0.005 mg/L 1 03/01/2013 11:12

 Vanadium < 0.005 0.005 mg/L 1 03/01/2013 11:12

 Zinc < 0.01 0.01 mg/L 1 03/01/2013 11:12

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: Crooked creek

Lab Order: G1302B37

Project: DEP Split Analysis Sampled By: Client

Lab ID: G1302B37-004 Collection Date: 02/21/2013 12:00

Matrix: Aqueous Received Date: 02/28/2013 06:22

Analyses Result QL Q Units DF Date Analyzed

Page 9 of 9