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COLUMBIA ANALYTICAL SERVICES,INC <br /> Analytical Report <br /> Client ARCO Products Company Service Request: S9700930 <br /> Project 21775-234 002/TO#21333 00/2168 STOCKTON Date Collected. 5/19/97 <br /> Sample Matrix Water Date Received: 5120/97 <br /> BTEX,NITBE and TPH as Gasoline <br /> Sample Name MW-4(58) Uruts ug/L(ppb) <br /> Lab Code S9700930-004 Basis NA <br /> Test Notes <br /> Prep Analysts DUution Date Date Result <br /> Analyte Method Method MRL Factor Extracted Analyzed Result Notes <br /> TPH as Gasoline EPA 5030 CA/LUFT 50 200 NA 5/29/97 57,000 <br /> Benzene EPA 5030 8020 05 200 NA 5/29197 8700 <br /> Toluene EPA 5030 8020 05 200 NA 5/29/97 6700 <br /> Ethylbenzene EPA 5030 8020 05 200 NA 5/29/97 1300 <br /> Xylenes,Total EPA 5030 8020 05 200 NA 5/29/97 5000 <br /> Methyl tert-Butyl Ether EPA 5030 8020 3 200 NA 5/29/97 <600 Cl <br /> C I The MRI.was elevated due to high analyte concentration requmng sample dilution <br />• IS22J020597p <br /> Page 7 <br />