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COLUMBIA ANALYTICAL SERVICES INC " <br /> QA/QC Report _ <br /> Client EMCON Associates Date Received 11/19/93 <br /> Project EMCON Project No OG71-017 01 Service Request No SJ93-1434 <br /> ARCO Facility No 434 Sample Matrix Water <br /> i <br /> Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/California DHS LOFT Method <br /> Sample Name Date Analyzed Percent Recover <br /> a,a,a-Tri fluorotoluene <br /> W-1A {77} 11/23/93 80 <br /> W-26 (86) 11/23/93 86 <br /> W-3 (68) 11/23/93 85 <br /> W-5 {691 11/23/93 85 <br /> W-6 (69) 11/23/93 85 <br /> W-7 (6g) 11/23/93 82 <br /> W-8 (69) 11/24/93 89 <br /> W-9 (78) 11/24/93 88 <br /> W-10 (78) 11/24/93 87 <br /> W-1 1 (79) 11/24/93 83 <br /> W-12 (77) 11/24/93 91 <br /> W-8 (69) MS 11/24/93 85 <br /> W-8 (69) DMS 11/24/93 88 <br /> Method Blank 11/23/93 $5 <br /> Method Blank 11/24/93 88 <br /> CAS Acceptance Criteria 70-130 <br /> Approved by Date <br /> c- Ina,. n7CA <br />