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COLUMBIA ANALYTICAL SERVICES, INC. <br /> QA/QC Report <br /> Client: ARCO Products Company Service Request: S9501524 <br /> Protect: 1775-234 001 /TO# 17075 00/ 2168 Stockton Date Collected 11/29/95 <br /> Sample Matrix Water Date Received: 12/1/95 <br /> Date Extracted: NA <br /> Date Analyzed- 12/8-11/95 <br /> Surrogate Recovery Suinman <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/California DHS LUFT Method <br /> PID Detector FID Detector <br /> Percent Recovery Percent Recovery <br /> Sample Name Lab Code 4-Bromofluorobenzene a,(x,a—Tritluorotoluene <br /> MW-1 (5 4) S95015244)01 95 100 <br /> MW-2 (53) 59501524-002 94 96 <br /> MW-3 (53) S95015244)03 96 97 <br /> MW-4 (54) S9501524-004 92 96 <br /> MW-5 (55) S9501524-005 94 105 <br /> MW-6 (45) S95015244006 93 104 <br /> MW-7 (48) S95015244)07 95 97 <br /> MW-1 (54)MS S9501524-OOIMS 102 111 <br /> MW-1 (54)DMS S9501524-001 DMS 98 107 <br /> Method Blank 5951208-WB 90 95 <br /> Method Blank 5951211-WB 91 97 <br /> CAS Acceptance Limits 69-116 69-116 <br /> SUR=0194 <br /> Page 6 <br />