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W COLUMBIA ANALYTICAL SERVICES, INC. <br /> QA/QC Report <br /> Client. EMCON Associates Date Received 04/30/93 <br /> Project EMCON Project No OG71-019 01 Service Request No.: SJ93-0591 <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 /> $amg)l-e Name Date Analyzed Percent Recovery <br /> a,a,a-Tnfluorotoluene <br /> PR-1 (27) 05/12/93 89 <br /> PR-2 (27) 05/12/93 92 <br /> BHD-1 1271 05111/93 93 <br /> BHD-2 1281 05/12/93 90 <br /> E-2 (22) 05/11/93 101 <br /> E-3 (17) 05/11/93 86 <br /> E-4 121) 05/12/93 100 <br /> E-5 119) 05/12/93 93 <br /> E-6 (181 05/12/93 93 <br /> E-7 0 81 05/12/93 92 <br /> E-8 (23) 05/13/93 109 <br /> E-9 (18) 05/12/93 93. <br /> E-10 (22) 05/12/93 87 <br /> E-11 (23) 05/12/93 88. <br /> E-12 122) 05/12/93 91. <br /> PR-1 (27) MS 05/12/93 97 <br /> PR-1 (27) DMS 05/12/93 96 <br /> Method Blank 05/11/93 86 <br /> Method Blank 05/12/93 87 <br /> Method Blank 05/13/93 81 <br /> CAS Acceptance Criteria 70-130 <br /> TPH Total Petroleum Hydrocarbons <br /> Approved by. AADate ly aj�3 <br /> 10 <br /> 1921 Ringwood Avenue • Son lose California 95131 • Telephone 408/407-2400 Fox 408/437-9356 <br />