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www.en qr eb.com Nelena M1677-472-0711 • Billings, W600-735-4409 • Casper, WY 650-Z35-0515 <br />AuryEtatF,x aSbcra@SS `;(f „ _ c irhe, vrv 866.666-7175 • Rapid City, SD 886-6721225 • Co,lege Station, TX 888-89D-2218 <br />QA/QC Summary Report <br />Client: Cotter Corporation Report Date: 09/14/10 <br />Project: Schwartzwalder Water Mo nitoring Program Work order: C10080538 <br />Analyte Count Result Units RL %REC Low Limit High Limit RPD RPDL,mit Qua, <br />Method: RA-05 Batch: RA228-3338 <br />Sample ID: LCS-228-RA226-4747 Laboratory Control Sample Run: TENNELEC-3_100825B 09/01/10 17:37 <br />Radium 228 6.3 pCi/L 99 70 130 <br />Sample ID: MB-RA226-4747 3 Method Blank Run: TENNELEC-3_100825B 09/01/10 17:37 <br />Radium 228 -1 pCi/L U <br />Radium 228 precision (±? 1 pCi/L <br />Radium 228 MDC 2 pCi/L <br />Sample ID: C10080605-004HMS Sample Matrix Spike Run: TENNELEC-3_100825B 09/01/10 17:37 <br />Radium 228 15 pCi/L 100 70 130 <br />Sample ID: C10080605-004HMSD Sample Matrix Spike Duplicate Run: TENNELEC-3_100825B 09/01/10 17:37 <br />Radium 228 14 pCi/L 94 70 130 5.3 44.6 <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 25 of 31 <br />