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COLUMBIA ANALYTICAL SERVICES, INC <br /> Client EMCON Associates Date Received 02/13/92 <br /> Project EMCON Project No G71-17 01 Work Order tl SJ92-0154 <br /> Arco Facility No 434 Sample Matrix Water <br /> QA/QC Report <br /> Surrogate Recovery Summary <br /> STEX and TPH as Gasoline <br /> EPA Methods 5030/8020/DHS LUFT Method <br /> Sample-Name _Date Analyzed Percent Recovery <br /> a,a,a-Trifluorotoluene <br /> W-2A (63) 02/18/92 118 <br /> W-28 (86) 02/14/92 118 <br /> W-5 (69) 02/14/92 106 <br /> W-6 (69) 02/14/92 105 <br /> W-7 (69) 02/14/92 102 <br /> W-8 (68) 02/18/92 102 <br /> W-12 (77) 02/18/92 114 <br /> W-11 (791 02/14/92 75 <br /> W-1 A (77) 02/14/92 119 ` <br /> W-9 (78) 02/14/92 110 ` <br /> W-3 168) 02/14/92 116 <br /> W-10 (78) 02/14/92 121 ` <br /> W-9 (78) MS 02/18/92 120 <br /> W-9 (78) MSD 02/18/92 115 <br /> Method Blank 02/14/92 122 <br /> Method Blank 02/18/92 117 <br /> CAS Acceptance Criteria 70-130 <br /> TPH Total Petroleum Hydrocarbons <br /> ' The surrogate used on these samples was 4-Bromofluorobenzene <br /> Approved byA fZ it iw Date .-J4 d 1 <br /> i <br /> 8 <br />