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" COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> Client ARCO Prodml%Couipanv Service Request 59700570 <br /> ProjeLt 2177 -229 0011104 19350 00/2130 5 COCKTON Date Collected 3125197 <br /> Sampic.Matrix Walcx Date Reeuved 3128/97 <br /> Date Extracted NA <br /> Date Analred 4/7197 <br /> Magri\Spike/Dupivate Mdtrix Spike Summary <br /> BTE <br /> Sample Name I iA 1 CI1 QC Units ug1L(ppb) <br /> Lab Code IN9700590-002M5 59700590-002DMS Basis NA <br /> Test Note,, <br /> Percent Recuvcry <br /> CAS Relative <br /> Prep Analvsn Spike Level Sample Spike Result Aticeptanc,e Percent <br /> Analyte Wthod Method MRL MS DMS Result MS DMS MS DMS Limits Difference <br /> Benzene NONE 8020 Sly 1000 1000 580 1500 1400 92 82 75-135 7 <br /> Toluene NONL 8020 0 5 1000 1000 120 1000 1000 88 88 73-136 <1 <br /> Ethylbenzene NONr 8020 0 5 1000 1000 360 1300 1200 94 84 69-142 8 <br /> 0Mv02059711 <br /> ,1700570 AL1, p I.111 l I W.- Page 15 <br /> Page No <br />