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COLUMBIA ANALYTICAL SERVICES, INC <br /> Client EMCON Associates Date Received 04/23/92 <br /> Project EMCON Project No G71-18 01 Work Order It SJ92-0489 <br /> Arco Facility No 2093 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 /> N9IL (ppb) <br /> Sample Name ATR-4 222) <br /> Date Analyzed 04/27/92 <br /> Percent Recovery <br /> Sample Spike Result Acceptance <br /> Analytes Seike Level Result MS DMS MS DMS Criteria <br /> TPH as Gasoline 2,500 556 2,964 2,918 96 94 70-140 <br /> TPH Total Petroleum Hydrocarbons <br /> • Approved byM Z r 1 Date V , r 2- <br /> 8 <br /> 1921 Rinawood Avenue 9 Son Jose Coltforrio 95131 • Teleohone 408/437 2400 9 Fox 408/437 9336 <br />