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� a <br /> COLUMBIA ANALYTICAL SERVICES, INC r <br /> N <br /> QA/QC Report <br /> Client EMCON Associates Date Received 01/29/93 <br /> Project EMCON Project No OG71-019 01 Service Request No SJ93-0122 <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 /> Stele Name Date Analyzed Percent Recovery, <br /> a,a,a-Trifluorotoluene <br /> PR-1 (271 02/05/93 98 <br /> PR-2 (27) 02/05/93 97 <br /> BHD-1 (27) 02/05/93 105 <br /> BHD-2 (28) 02/05/93 97 <br /> E-2 (22) 02/08/93 116 <br /> E-3 (18) 02/05/93 126 <br /> E-4 (21) 02/05/93 128 <br /> E-5 (19) 02/08/93 105 <br /> E-6 (18) 02/08/93 100 <br /> E-7 (18) 02/09/93 102 ` <br /> E-8 (23) 02/05/93 107 • <br /> E-9 0 81 02/05/93 113 ' <br /> E-10 (22) 02/08/93 101 <br /> E-11 (23) 02/10/93 121 <br /> E-12 (22) 02/08/93 108 <br /> E-2 (22) MS 02/08/93 123 <br /> E-2 (22) DMS 02/08/93 124 <br /> Method Blank 02/05/93 89 <br /> Method Blank 02/08/93 96 <br /> Method Blank 02/09/93 99 <br /> Method Blank 02/10/93 99 <br /> CAS Acceptance Criteria 70-130 <br /> TPH Total Petroleum Hydrocarbons <br /> The surrogate used for this sample was 4-BromofIuorobenzene <br /> Approved by: Date. <br /> 12 <br />