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COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> Client- EMCON Associates Date Received 11/01/93 <br /> Project EMCON Project No OG71-038 01 Service Request No SJ93-1339 <br /> ARCO Facility No 2168 Sample Matrix Water <br /> Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/California DHS LUFT Method <br /> I <br /> Sample Name Date Analyzed Percent Recovery <br /> a,a,a-Tnfluorotoluene <br /> MW-1 1541 11/10/93 83 <br /> MW-2 1531 11/09/93 78 <br /> MW-3 (54) 11/10/93 75 <br /> MW-4 (59) 11/09/93 72 <br /> MW-5 (55) 11/10/93 80 <br /> MW-6 (47) 11/10/93 73 <br /> MW-7 (48) 11/11/93 77 <br /> Ms 11/10/93 83 <br /> DMS 11/10/93 79 <br /> Method Blank 11/09/93 80 <br /> Method Blank 11110/93 82 <br /> Method Blank 11/11/93 74 <br /> CAS Acceptance Criteria 70-130 <br /> i <br /> Approved by Date <br /> 12 _ <br />