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COLUMBIA ANALYTICAL SERVICES, INC <br /> OA/QC Report <br /> Client EMCON Associates Date Received 05/28/93 <br /> Project EMCON Project No OG71-017 01 Service Request No SJ93-0719 <br /> ARCO Facility No 434 Sample Matrix Water <br /> Matrix Spike/Duplicate Matrix Spike Summary <br /> TPN as Gasoline <br /> EPA Methods 5030/California DHS LOFT Method <br /> Vg/L (ppb) <br /> Sample Name W-1 A (7 7) <br /> Date Analyzed 06/01/93 <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 249 234 100 94 76-130 <br /> TPH Total Petroleum Hydrocarbons <br /> ND None Detected at or above the method reporting limit <br /> Approved by Date <br /> 9 <br /> 1921 Ringwood Avenue • Son Jose Colifornio 95131 • telephone 4081437 2400 • Fox 4081437 9356 <br />