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COLUMBIA ANALYTICAL SERVICES, INC <br /> Client EMCON Associates Date Received 07/31/92 <br /> Project EMCON Project No G71-19 01 Work Order # SJ92-0945 <br /> Arco Facility No 2133 Sample Matrix Water <br /> QA/QC Report <br /> Matrix Spike/Duplicate Matrix Spike Summary <br /> TPH as Gasoline <br /> EPA Method 5030/DHS LUFT Method <br /> Ng/L (ppb) <br /> Sample Name PR-1 27 <br /> Date Analyzed 08/04/92 <br /> Percent Recovery <br /> Sample Spike Result Acceptance <br /> • Analytes Spike Level Rhe ,ylt. MS DM$ MS D KS Criterip <br /> TPH as Gasoline 250 ND 254 254 102 102 70-140 <br /> TPH Total Petroleum Hydrocarbons <br /> ND None Detected at or above the method reporting limit <br /> Approved by Date <br /> 11 <br /> 1921 Ringwood Avenue 9 Son Jose Californio 95131 • Telephone 408/437-2400 • Fox 4081437-9356 <br />