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T , <br /> COLUMBIA ANALYTICAL SERVICES, INCA ° <br /> QA/QC Report <br /> Client EMCON Associates Date Received 11/19/92 <br /> Project EMCON Project No OG71-017 01 Work Order No SJ92-1466 <br /> ARCO Facility No 434 Sample Matrix Water <br /> Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/California DHS LUFT Method <br /> Sam le Name Date Analyzed Percent Recover <br /> a,a,a-Trifluorotoluene <br /> W-1 A (77) 11/25/92 88 <br /> W-3 (68) 11/30/92 83 <br /> W-5 (69) 11/25/92 88 <br /> W-6 (69) 11/25/92 88 <br /> W-7 (69) 11/25/92 90 <br /> I <br /> W-8 (69) 11/25/92 90 <br /> W-9 (78) 11/25/92 90 <br /> W-10 (78) 11/25/92 85 <br /> W-11 (79) 11/25/92 91 <br /> W-12 (77) 11/25/92 93 <br /> W-2B (86) 11/25/92 93 <br /> W-3 (68) MS 11/25/92 88 <br /> W-3 (68) DMS 11/25/92 90 <br /> Method Blank 11/25/92 1 13 <br /> Method Blank 11/30/92 124 <br /> CAS Acceptance Criteria 70-130 <br /> TPH Total Petroleum Hydrocarbons <br /> i <br /> Approved by bAh11? 01�cL� _ Date <br /> 9 <br />