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COLUMBIA ANALYTICAL SERVICES. INC. <br /> Client- EMCON Associates <br /> Date Received: 04/23/92 <br /> Project EMCON Project No G71-29 01 Work Order#: SJ92-0490 <br /> Arco Facility No 2130 Sample Matrix: Water <br /> QA/QC Report <br /> Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/DHS LUFT Method <br /> $ample Name Date Analyzed Percent Recovery <br /> a,a,a-Trifluorotoluene <br /> MW-1 (73) 04/27/92 84 <br /> MW-2 (72) 04/29/92 114 ` <br /> MW-3 (72) 05/01/92 99 <br /> Method Blank 04/27/92 97 <br /> Method Blank 04/29/92 96 <br /> Method Blank 05/01/92 92 <br /> CAS Acceptance Criteria 70-130 <br /> TPH Total Petroleum Hydrocarbons <br /> • The surrogate used on this sample was 4-Bromofluorobenzene <br /> Approved by `t��ti u Date o <br /> 5 <br />