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COLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QC Report <br /> Client ARCO Products Company Service Request, L9901977 <br /> Protect. WAN 24406 0016020-Manteca Date Collected: NA <br /> Sample Matrix Soil Date Received: NA <br />' Date Extracted: NA <br /> Date Analyzed: NA <br /> Surrogate Recovery Summary <br /> IOxygenates <br /> Prep Method EPA 5030 Units PERCENT <br /> Analysis Method 8260E Basis Wet <br /> Test P e r c e n t R e c o v e r y <br /> Sample Name Lab Code Notes Dibromofluoromethane Toluene-D8 4-Bromofluorobenzene <br /> 1 T-2-S(16') L9901977-001 96 100 101 <br /> T-3-S(16') L9901977-002 75 90 108 <br /> T-2-M(16') L9901977-003 91 94 106 <br /> T-3-M(16') L9901977-004 91 73 A3 91 <br /> T-2-N(16') L9901977-005 119 98 116 <br /> T-3-N(16') L9901977-006 84 82 86 <br /> T-1-S(16') L9901977-007 93 95 97 <br /> T-1-N(16') L9901977-008 78 83 114 <br /> Method Blank 1,990501-MB 102 104 88 <br /> Method Blank L990503-MB 90 94 89 <br /> T-2-S(16') L9901977-001 MS 101 112 90 <br /> T 2-S(161) 1,9901977-0OIDM 89 111 120 <br /> T-1-S(16') L9901977-007MS 95 87 86 <br /> T-1-S(16') L9901977-007DM 91 92 85 <br /> Lab Control Sample L990501-LCS 93 109 103 <br /> Lab Control Sample L990503-LCS 98 95 91 <br /> S <br /> CAS Acceptance Limits 70-130 81-115 74-121 <br /> A3 Outside of acceptance lunmts because of matrix effects This sample was analyzed a second time and <br /> again produced unacceptable recovery values The results from the reanalysis are reported <br /> Approved By Date <br /> SU01977VOA- Page No <br /> Ql4TTVOAHWI SUR3SJ4199 <br />