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COLUMBIA ANALYTICAL SERVICES, INC <br /> Client EMCON Associates Date Received. 01/23/92 <br /> Project EMCON Project No G71-19 01 Work Order # SJ92-0086 <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 Methods 5030/DHS LUFf Method <br /> NglL {ppb) <br /> Sample Name E-7 (19) <br /> Date Analyzed 01/28/92 <br /> Percent Recovery <br /> Sample Spike Result Acceptance <br /> Analytes Snike Level Result Ms DMS MS DMS Criteria <br /> TPH as Gasoline 2,500 860 3,290 3,440 97 103 70-140 <br /> TPH Total Petroleum Hydrocarbons <br /> Approvedby Date <br /> 9 <br /> 1921 Ringwood Avenue • Son Jose California 95131 • Telephone 4081407 2400 • Fox 4081437 9356 <br />