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COLUMBIA ANALYTICAL SERVICES, INC. <br /> Client: EMCON Associates Date Received: 08/26/92 <br /> Project: EMCON Project No. G71-38.01 Work Order A: SJ92-1071 <br /> Arco Facility No. 2168 Samprc Matm: Water <br /> QA/OC Report <br /> Matrix Spike/Duplicate Matrix Spike Summary <br /> TPH as Gasoline <br /> EPA Method 5030/DHS LUFT Method <br /> Pg/L (ppb) <br /> i <br /> Date Analyzed: 08/31/92 <br /> Percent Recovery <br /> Sample Spike Result Acceptance <br /> Anftes Soike Levef Res I MS DMS MS DMS Criteria <br /> iTPH as Gasoline 250. ND 257 261 103 104 70-130 <br /> i <br /> TPH Total Petroleum Hydrocarbons <br /> ND None Detected at or above the method reporting limit <br /> Approved by LDate <br /> 10 <br />