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COLUMBIA ANALYTICAL SERVICES,INC. <br /> 1� ChAnalytical Reporteat: ARCO Products Company Service Request: 59601539 <br /> Project: 2130 Stockton/#21775-229 002/TO#19350 00 Date Collected: 9 18/96 <br /> Sample Matrix. Water Date Received: 9 20/96 <br /> Date Extracted: "%;A <br /> BTEX, MTBE and TPH as Gasoline <br /> EPA Methods 503018020/Califorsua DHS LUFT Method <br /> Units ug/L(ppb) <br /> Sample Name MW-4 (74) MW-5 (76) MW-6 (72) <br /> Lab Code 59601539-004 59601539-005 S9601539-006 <br /> Date Analyzed 9/30/96 9/30/96 9/30/96 <br /> Analyte MRL <br /> TPH as Gasoline 50 ND <300 X <200 X <br /> Benzene 0 5 ND 33 ND <br /> Toluene 0 5 ND ND ND <br /> £thylbenzene 0 5 ND 9 0 ND <br /> Total Xylenes 0 5 ND ND ND <br /> Methyl tort-Butyl Ether 3 ND ND ND <br /> X The sample contains non-fuel components eluting to the gasoline range, and quantitated as <br /> gasoline The chromatogram does not match the typical gasoline fingerprint <br /> 3siMW4 <br /> Page 4 <br />