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COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> Client EMCON Associates Date Received 08/06/93 <br /> Project EMCON Project No OG71-01 9 01 Service Request No SJ93-0977 <br /> ARCO Facility No 2133 Sample Matrix Water <br /> Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/California DHS LUFT Method <br /> Sample Name Date Analyzed Percent Recover <br /> a,a,a-Tnfluorotoluene <br /> PR-1 (27) 08/16/93 84 <br /> PR-2 (27) 08/16/93 88 <br /> BHD-1 (2 7) 08/16/93 92 <br /> BHD 2 (28) 08/16/93 87 <br /> E-2 (21 ) 08/16/93 99 <br /> E-3 (18) 08/16/93 96 <br /> E-4 (21) 08/16/93 96 <br /> E-5 (19) 08/17/93 92 <br /> E-6 (18) 08/16/93 92 <br /> E-7 (18) 08/17/93 106 <br /> E-8 (23) 08/16/93 105 <br /> E-9 (18) 08/16/93 117 <br /> E-10 (22) 08/16/93 92 <br /> E-11 (22) 08/16/93 122 <br /> E-12 (23) 08/16/93 121 <br /> PR-1 (27) MS 08/16/93 94 <br /> PR-1 (27) DMS 08/16/93 95 <br /> E-8 (23) MS 08/16/93 107 <br /> E-8 (23) DMS 08/16/93 106 <br /> Method Blank 08/16/93 83 <br /> Method Blank 08/17/93 87 <br /> CAS Acceptance Criteria 70-130 <br /> Approved b <br /> y Date /� <br />