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www.erie #ab.wm x'1{ 7270711 • Billings, MT 800-135-4489 • Casper, WY 889-235-0515 <br />+I V,5 Raged c y, SD 818-672-1225 • College Station, TX OW690-2218 <br />QA/QC Summary Report <br />Prepared by Casper, WY Branch <br />Client: Cotter Corporation Report Date: 03/24/11 <br />Project: Schwartz GW 3/04/11 S25660 Work Order: C11030181 <br />Analyte Count Result Units RL %REC Low Limit High Limit RPD RPDLimit Qual <br />Method: E903.0 Batch: RA226-5219 <br />Sample ID: C11030181-001 EMS Sample Matrix Spike Run: BERTHOLD 770-2_110308A 03/14/11 17:07 <br />Radium 226 13 pCi/L 88 70 130 <br />Sample ID: C11030181-001EMSD Sample Matrix Spike Duplicate Run: BERTHOLD 770-2_110308A 03/14/11 17:07 <br />Radium 226 14 pCi/L 99 70 130 9.8 28.2 <br />Sample ID: MB-RA226-5219 3 Method Blank Run: BERTHOLD 770-2_110308A 03/14/11 17:07 <br />Radium 226 -0.087 pCi/L U <br />Radium 226 precision (±) 0.072 pCi/L <br />Radium 226 MDC 0.18 pCi/L <br />Sample ID: LCS-RA226-5219 Laboratory Control Sample Run: BERTHOLD 770-2_110308A 03/14/11 17:07 <br />Radium 226 6.3 pCi/L 101 85 115 <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 16 of 20 <br />.e „