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COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/OC Report <br /> Client EMCON Associates Date Received 04/27/93 <br /> Project EMCON Project No OG71-017 01 Service Request No SJ93-0564 <br /> ARCO Facility No 434 Sample Matrix Water <br /> Matrix Spike/Duplicate Matrix Spike Summary <br /> TPH as Gasoline <br /> EPA Methods 5030/California DHS LUFT Method <br /> Jag/L (ppb) <br /> Date Analyzed 05/03/93 <br /> Percent Recovery <br /> Spike CAS <br /> Spike Sample Result Acceptance <br /> Analyte Level Result MS DMS MS DMS Criteria <br /> TPH as Gasoline 250 ND 239 236 96 94 76-130 <br /> TPH Total Petroleum Hydrocarbons <br /> ND None Detected at or above the method reporting limit <br /> i <br /> Approved by Date <br /> 6 <br /> 1921 Ringwood Avenge • Son Jose California 95131 • Telephone 4081437-2400 • Fax 408/437 9356 <br />