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COLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QC Report <br /> 4 Client: EMCON <br /> Service Request: K9503131 <br /> Protect: ARCO Stockton 2168/T0# 17075 00/1775-234 001 Date Collected: NA <br /> LCS Matrix: Nater Date Received: NA <br />' Date Extracted: 5125195 <br /> Date Analyzed: 5/26/95 <br />' Laboratory Control Sample Summary <br /> SM 5520 C&F <br /> Units mg/L(ppm) <br /> CAS <br /> Percent <br /> Recovery <br /> 1 True Percent Acceptance <br /> Analyte Valise Result Recovery Limits <br /> Oil 20 180 90 82-108 <br /> 1 <br />' SM Standard Methods for the Exam,nation of Water and Wastewater, 18th Ed, 1992 <br /> 1 <br /> Approved By Date <br /> LC5110219I <br /> 03131PHCSPI 416ogLC5 6295 Pap No <br />