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vww.energylab.com I Helena, MT 877-472-0711 • Billings, MT 800-7354489 p Casper, WY 888-235-0515 <br />AnelyticelExcellence since 1952 ' Gillette, WY 886-686-7175 a Rapid City, SD 888-672-1225 * College Station, TX 888-690-2218 <br />QA/QC Summary Report <br />Client: Cotter Corporation <br />Project: Schwartzwalder Water Monitoring Program <br />Report Date: 09/14/10 <br />Work Order: C10080305 <br /> <br />Analyte Count Result Units RL %REC Low Limit High Limit RPD RPDLimit Cual <br />Method: E903.0 Batch: RA226-4767 <br />Sample ID: C10080884-002CMS Sample Matrix Spike Run: BERTHOLD 770-1 _100901A 09/13/10 13:22 <br />Radium 226 16 pCi/L 98 70 130 <br />Sample ID: C10080884-002CMSD Sample Matrix Spike Duplicate Run: BERTHOLD 770-1_ 100901A 09/13/10 16:07 <br />Radium 226 14 pCi/L 87 70 130 12 24 <br />Sample ID: MB-RA226-4767 3 Method Blank Run: BERTHOLD 770-1 100901 A 09/13/10 16:07 <br />Radium 226 -0.08 pCi/L U <br />Radium 226 precision (±) 0.08 pCi/L <br />Radium 226 MDC 0.2 pCi/L <br />Sample ID: LCS-RA226-4767 Laboratory Control Sample Run: BERTHOLD 770-1_ 100901A 09/13/10 16:07 <br />Radium 226 6.7 pCi/L 85 70 130 <br />Method: E903.0 <br />Sample ID: C10080803-002EMS <br />Radium 226 <br />Sample ID: C10080803-002EMSD <br />Radium 226 <br />Sample ID: MB-RA226-4768 <br />Radium 226 <br />Radium 226 precision (±) <br />Radium 226 MDC <br />Sample ID: LCS-RA226-4768 <br />Radium 226 <br />Sample Matrix Spike <br />14.6 pCi/L <br />Sample Matrix Spike Duplicate <br />17.8 pCi/L <br />3 Method Blank <br />-0.04 pCi/L <br />0.1 pCi/L <br />0.2 pCi/L <br />Laboratory Control Sample <br />9.7 pCi/L <br />Batch: RA226-4768 <br />Run: BERTHOLD 770-2_100902A 09/08/10 16:05 <br />91 70 130 <br />Run: BERTHOLD 770-2_100902A 09/08/10 17:37 <br />112 70 130 20 27.6 <br />Run: BERTHOLD 770-2_100902A 09/08/10 17:37 <br />U <br />Run: BERTHOLD 770-2_100902A 09/08/10 21:07 <br />124 70 130 <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 15 of 21