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• W".energylab.com Helena, W 877-472-0711 • Billings, MT 800-735-4489 i Casper, wy 888-235-0515 % AwWalEwOnceShr" 1912 Gillette, WY 866-686-7175 • Rapid City, SD 888-672-1225 • College <br /> Station, TX 688-690-2218 <br />QA/QC Summary Report <br />Client: Cotter Corporation Report Date: 09/16/10 <br />Project: Schwartzwalder Water Monitoring Program Work Order: C10080658 <br />Analyte <br />i Count Result Units RL %REC Low Limit High Limit RPD RPDLimit Qual <br />Method: E900.0 Batch: GrAB-0949 <br />Sample ID: MB-GrAB-0949 6 Method Blank Run: G5000W_100820A 08/25/10 00:08 <br />Gross Alpha -0.8 pCi/L U <br />Gross Alpha precision (±) 0.7 pCi/L <br />Gross Alpha MDC 0.8 pCi/L <br />Gross Beta -0.7 pCi/L U <br />Gross Beta precision (±) 1 pCi/L <br />Gross Beta MDC 1 pCi/L <br />Sample ID: Th230-GrAB-0949 Laboratory Control Sample Run: G5000W_100820A 08/25/10 00:08 <br />Gross Alpha 130 pCi/L 128 70 130 <br />Sample ID: Cs137-GrAB-0949 Laboratory Control Sample Run: G5000W_100820A 08/25/10 00:08 <br />Gross Beta 76 pCi/L 86 70 130 <br />Sample ID: C10080658-001FMS Sample Matrix Spike Run: G5000W_100820A 08/25/10 12:32 <br />Gross Alpha 113 pCi/L 105 70 130 <br />Sample ID: C10080658-001FMSD Sample Matrix Spike Duplicate Run: G5000W_100820A 08/25/10 12:32 <br />Gross Alpha 133 pCi/L 124 70 130 16 17.9 <br />Sample ID: C10080658-001FMS Sample Matrix Spike Run: G5000W_100820A 08/25/10 12:32 <br />Gross Beta 95.7 pCi/L 101 70 130 <br />Sample ID: C10080658-001FMSD Sample Matrix Spike Duplicate Run: G5000W_100820A 08/25110 12:32 <br />Gross Beta 93.6 pCi/L 99 70 130 2.3 15.8 <br />Qualifiers: <br />RL - Analyte reporting limit. <br />MDC - Minimum detectable concentration <br />ND - Not detected at the reporting limit. <br />U - Not detected at minimum detectable concentration <br />Page 19 of 25