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r?_?++) www.eoergylab,com Helena, AST 877-472-0711 » Billings, AST 800-735-4489 + Casper WY 888-235-0515 <br />o Ans"eal4cohncoSlaca 1951 Gillette, WY 666-686-7175 a Rapid City, SD 888-672-1225 c College Station, TX 888490-2218 <br />QA/QC Summary Report <br />Client: Cotter Corporation <br />Project: Schwartzwalder Water Monitoring Program-Discharge <br />Analyte Count Result Units <br />Method: RA-05 <br />Sample ID: LCS-228-RA226-4802 Laboratory Con trol Sample <br />Radium 228 7.6 pCi/L <br />Sample ID: MB-RA226-4802 3 Method Blank <br />Radium 228 0.06 pCi/L <br />Radium 228 precision (±) 0.7 pCi/L <br />Radium 228 MDC 1 pCi/L <br />Sample ID: C10090551-001FDUP 3 Sample Duplicate <br />Radium 228 0.30 pCi/L <br />Radium 228 precision (±) 0.69 pCi/L <br />Radium 228 MDC 1.1 pCi/L <br />Sample ID: C10090355-007FMS Sample Matrix Spike <br />Radium 228 14 pCi/L <br />Report Date: 10/04/10 <br />Work Order: 010090551 <br />RL %REC Low Limit High Limit RPD RPDLimit Qual <br />Balch: RA228-3381 <br />Run: TENNELEC-3_100916B 09/24/10 11:49 <br />102 70 130 <br />Run: TENNELEC-3_1009168 09/24/10 11:49 <br />U <br />Run: TENNELEC-3_100916B 09/24/10 11:49 <br />25 502.8 U <br />Run: TENNELEC-3 1009168 09/24/10 11:49 <br />94 70 130 <br />Qualifiers: <br />RL • Analyle reporting limit. <br />MDC - Minimum delectable concentration <br />ND - Not detected at the reporting limit. <br />U - Not detected at minimum detectable concentration <br />Page 18 of 22