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COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> Client EMCON Associates Date Received 11/03/92 <br /> Project EMCON Project No OG71-019 01 Work Order No SJ92-1367 <br /> ARCO Facility No 2133 Sample Matrix Water <br /> Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/CalLfornia DHS LUFT Method <br /> Sample Name Date Analyzed_ Percent Recovery <br /> a,a,a-Tnfluorotoluene <br /> PR-1 (27) 11/06/92 84 <br /> PR-2 (27) 11/06/92 90 <br /> BHD-1 (27) 11/10/92 123 <br /> BHD-2 (28) 11/06/92 109 <br /> E-2 (22) 11/09192 89 <br /> E-4 (21) 11/10/92 89 <br /> E-8 (23) 11/10/92 87 <br /> E-9 (18) 11/06/92 97 <br /> E-10 (22) 11/10/92 86 <br /> E-1 1 (23) 11/10/92 94 <br /> E-12 (22) 11/10/92 1 1 1 <br /> E-9 (18) MS 11/06/92 129 <br /> E-9 (18) DMS 11/06/92 116 <br /> Method Blank 11/06/92 94 <br /> Method Blank 11/09/92 98 <br /> Method Blank 11/10/92 75 <br /> CAS Acceptance Criteria 70-130 <br /> TPH Total Petroleum Hydrocarbons <br /> * The surrogate used for this sample was 4-Bromofluorobenzene <br /> Ob <br /> Approved by �f�J4 Date <br /> 10 <br />