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COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> Client EMCON Associates Date Received- 02/26/93 <br /> Project EMCON Project No OG71-050 01 Service Request No SJ93-0279 <br /> ARCO Facility No 2076 Sample Matrix Water <br /> I <br /> Matrix Spike/Duplicate Matrix Spike Summary <br /> Total Petroleum Hydrocarbons as Gasoline <br /> EPA Methods 5030/California DHS LUFT Method <br />! lig/L (ppb) <br /> Sample Name MW-1 (61) <br /> Date Analyzed 03/08/93 <br /> Percent Recovery <br /> iSpike CAS <br /> Spike Sample Result Acceptance <br /> Analyte Level Result MS DMS MS DMS Criteria <br /> TPH as Gasoline 250 ND 254 248 102 98 70-130 <br /> TPH Total Petroleum Hydrocarbons <br /> ND None Detected at or above the method reporting limit <br /> Approved by Date ' <br />