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GOLDEN STATE I CAS LABORATORIES, INC <br /> . QA/QC Report <br /> Client- EMCON Associates Service Request No LA932740 <br /> Project ARCO Products Company/#OG71-018 Ol/SJ93-1091 <br /> Sample Matrix Water <br /> Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 602/Modified 8015/California DHS LUFT Method <br /> Sample Name Lab Code Percent Recovery Percent Recovery <br /> 4-Bromofluorobenzene a,a,a-Tnfluorotoluene <br /> ATR-1 (26') LA2740-1 98 77 <br /> ATR-2 (29') LA2740-2 103 83 <br /> ATR-4 (27') LA2740-3 103 93 <br /> ATR-5 (26') LA2740-4 102 89 <br /> ATR-7 (261 LA2740-5 99 78 <br /> ATR-8 (24') LA2740-6 102 NA <br /> ATR-9 (24') LA2740-7 97 75 <br /> ATR-10 (24') LA2740-8 102 77 <br /> ATR-11 (23') LA2740-9 96 72 <br /> ATR-12 (24') LA2740-10 96 70 <br /> Method Blank LA2740-MB 102 73 <br /> CAS Acceptance Criteria 50-130 60-120 <br /> NA Not Applicable because of the sample matrix The chromatogram showed <br /> target components that interfered with determination of the surrogate <br /> r <br /> Approved by. Y� , — Date )D <br /> 6925 CANOGA AVENUE X CANOGA PARK, CA 91303 ■ 818 587-5554 0 FAX 818 587-5555 <br />