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COLUMBIA ANALYTICAL SERVICES, INC <br /> Client EMCON Associates Date Received 08/20/92 <br /> Project EMCON Project No G71-17 01 Work Order # SJ92-1049 <br /> Arco Facility No 434 Sample Matrix Water <br /> QA/QC Report <br /> Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/DHS LUFT Method <br /> Sample NameDate Analyzed Percent Recovery <br /> T 4-Bromofluorobenzene <br /> a,a,a-Tnfluorotoiuene <br /> W-1 A (76) 08/25/92 109 <br /> W-3 (68) 08/25/92 117 <br /> W-5 (69) 08/25/92 96 <br /> W-6 (68) 08/25/92 100 <br /> W-7 (69) 08/25/92 96 <br /> W-8 (68) 08/25/92 89 <br /> W-9 (78) 08/27192 105 <br /> W-10 178) 08/25/92 121 <br /> W-11 179) 08/25/92 102 <br /> W-12 177) 08/25/92 105 <br /> W-213 (86) 08/25/92 90. <br /> S-4 MS 08/25/92 101 <br /> S-4 DMS 08/25/92 88 <br /> Method Blank 08/25/92 102 <br /> Method Blank 08/27/92 109 <br /> CAS Acceptance Criteria 70-130 <br /> TPH Total Petroleum Hydrocarbons <br /> Approved by "rr'f Date <br /> 9 <br /> 1921 Ringwood Avenue • San Jose California 95131 • Telephone 4081437-2400 • Fox 4081437-9356 <br />