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COLUMBIA ANALYTICAL SERVICES, INC. <br /> QA/QC Report <br /> Client: ARCO Products Companv Service Request: 59501567 <br /> Project: 1775-206 001 /TO# 17075 00/548 Stockton Date Collected* 1214/95 <br /> Sample Matrix ater Date Received: 12/7/95 <br /> Date Extracted- NA <br /> Date Analyzed. 12/14 15/95 <br /> Surrogate Recovery Suammary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/Cahfomia DHS LUFT Method <br /> PID Detector FID Detector <br /> Percent Recovery Percent Recovery <br /> Sample lame Lab Code 4-Bromofluorobenzene ix,a,a—Trifluorotoluene <br /> MW-I (56) 59501567-001 103 96 <br /> MW-2 (6 1) S9501567-002 96 96 <br /> MW-3 (62) 59501567-003 88 100 <br /> MW-4(63) 59501567-004 94 100 <br /> MW-5 (6 1) S950I567-005 97 104 <br /> MW-6 (58) S9501567-006 99 97 <br /> MS S9501540-003MS 90 107* <br /> DMS S9501540-003 DMS 88 111* <br /> Method Blank S951214-WB 91 101 <br /> Method Blank S951215-WB 96 103 <br /> CAS Acceptance Limits 69-116 69-116 <br /> * The surrogate used for this sample is 4-bromofluorobenzene <br /> SUR AM144 <br /> Page 5 <br />