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' vnm.energYlab.com ( Halena, MT 877-4724711 a Billings, MT $00-735-4489 . Casper, WY 888-235-0515 <br />`Ana <br />rylicalExca!larrceSlnu 1352 Gillette, WY 686-686-7175 Rapid City, SD 888-672-1128 p College Station, TX 888-690-2218 <br />QA/QC Summary Report <br />Client: Cotter Corporation <br />Project: Schwartzwalder Water Monitoring Program-Discharge <br />Report Date: 09/21/10 <br />Work Order: 010090075 <br />Anal a Result Units RL %REC Low Limit High Limit RPD RPDLimil Qual <br />Method: RA-05 <br />Sample ID: LCS-228-RA226-4772 Laboratory Control Sample <br />Radium 228 53 pCi/L <br />Sample ID: MB-RA226-4772 Method Blank <br />Radium 228 -0.32 pCi/L <br />Radium 228 precision (±) 1.00 pCi/L <br />Radium 228 MDC 1.7 pCi/L <br />Sample ID: C10090075.001AMS Sample Matrix Spike <br />Radium 228 12 pCi/L <br />Sample ID: C10090075.001AMSD Sample Malrix Spike Duplicate <br />Radium 228 12 pCi/L <br />Batch: RA228-3361 <br />Run: TENNELEC-3_100907A 09/10110 13:44 <br />75 70 130 <br />Run: TENNELEC-3_100907A 09/10/1013:44 <br />U <br />Run: TENNELEC-3-.100907A 09/10/1013:45 <br />79 70 130 <br />Run: TENNELEC-3 100907A 09110/10 13:45 <br />76 70 130 1.2 52.7 <br />Qualifiers: <br />RL - Analyte reporting limit. ND - Not detected at the reporting limit. <br />MDC - Minimum detectable concentration U - Not detected at minimum detectable concentration <br />Page 5 of 8