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COLUMBIA ANALYTICAL SERVICES, INC <br /> I� N DA/QC Report <br /> Client: EMC0 Associates Date Received: 12/18/92 <br /> Project' EMCON Project No OG71-038 01 Service Request No • SJ92-1604 <br /> ARCO Facility No 2168 <br /> Initial Calibration Verification <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/DHS LUFT Method <br /> Nanograms <br /> Date Analyzed- 12/24/92 <br /> CAS <br /> Percent <br /> Tie Recovery <br /> An Percent Acceptance <br /> alyte Value Rift Recovery Crrtena <br /> Benzene .102 <br /> 250. 256 85-115 <br /> Toluene 250. 262 105 85-115 <br /> Ethylbenzene 250 246 98 85-115 <br /> Total Xylenes 750 718 96 85-115 <br /> TPH as Gasoline 2,500 2,359 94 90-110 <br /> TPH Total Petroleum Hydrocarbons <br /> Approved by: Date: <br /> a <br />