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COLUMBIA ANALYTICAL SERVICES,INC <br /> QA/QC Report <br /> • Client ARCO ProduLts Gompanv <br /> Prosect 21775-229 003/TO112[333 00/2130 STOCKTON Service Request- S9700959Date Analyzed 5/30/97 <br /> Initial CdItbration Venfication(ICV) Summary <br /> BTEX,MTBE and TPH as Gasoline <br /> Sample Name I(,V <br /> Lab Code i(V1 Units ug/L(ppb) <br /> Test Notes Basis PSA <br /> ICV Source <br /> Prep Analysis True Percent Result <br /> Analyte Method Method <br /> Value Result Recovery Nate: <br /> TPH as G4sohne EPA 5030 CA/LUFT 250 250 <br /> 100 <br /> Benzene EPA 5030 8020 25 25 <br /> L00 <br /> Toluene <br /> EPA 5030 8020 25 24 96 <br /> Ethvlberizene EPA 5030 8020 25 24 <br /> Xylenes notal 95 <br /> Y EPA 5(13U 8020 75 71 95 <br /> Methyl teri-But%I Ether EPA 5030 8020 25 27 <br /> 108 <br /> ICV/01219F <br /> Page 21 of 21 <br />