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COLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QC Report <br /> Client: ARCO Products Company Service Request: 59501686 <br /> Project: 1775-237.001 /TO# 17075.00 /2186 Stockton Date Collected: 12/22/95 <br /> Sample Matrix: Water Date Received: 12/27/95 <br /> Date Extracted: NA <br /> Date Analyzed: 12/29/95-1/2/96 <br /> Surrogate Recovery Summa.*,, <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 cx,a,a—Trifluorotoluene <br /> MW-1 (74) 59501686-001 87 113 <br /> MW-2 (74) 59501686-002 95 99 <br /> MW-3 (74) 59501686-003 95 97 <br /> MS S9501687-002MS 97 98 <br /> DMS 59501687-002DMS 97 101 <br /> Method BIank S951229-WB 94 94 <br /> Method Blank S960102-WB 93 100 <br /> CAS Acceptance Limits: 69-116 69-116 <br /> SURV060194 <br /> Page 5 <br />