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TABLE 1 <br /> GROUNDWATER MONITORING DATA <br /> ARCO Service Station No 2130 <br /> 7906 North EI Dorado Street, Stockton, California <br /> Elevation Static Water Groundwater Ethyl- Total <br /> Well Top of Casing Top of Screen Level Elevation TPHg Benzene Toluene benzene Xylene MtBE <br /> Number Date feet msl ft btc ft btc feet msl p L p L ugIL L MugIL Observations <br /> MS-3B 12/19/02 NM 4184 NE 1,200 26 14 27 <050 71[2] NA <br /> 316103 NM 3923 NE 11100 68 3 5 71 56 19[2] NA <br /> tc=below top of casing <br /> msl=mean sea level <br /> bgs=below ground surface NA=Not analyzed NE=Not evaluated <br /> pg/L=Analytical results in micrograms per liter FP=Free Product <br /> TPHg=Total Petroleum hydrearbons as gasoline S=Sheen <br /> MtBE=methyl tert-butyl ether <br /> MtBE was analyzed using USEPA Method 8020 <br /> <=Below detection limit for the analytic methods used <br /> "=Raised method reporting limit(MRL)due to high analyte concentration requiring sample dilution <br /> Raised MRL due to matrix interference <br /> The sample contains discrete non-fuel components eluting in the gasoline range, quantified as gasoline <br /> The chromatogram does not match the typical gasoline fingerprint <br /> [1]=Not sampled,as well is scheduled to be abandoned <br /> [2] MtBE was analyzed using USEPA Method 8260E <br /> [3]Chromatogram Pattern Weathered Gasoline C6-C12 <br /> [4]Benzene,toluene,ethylbenzene and total xylenes were analyzed using USEPA Method 8260B <br /> [5]Chromatogram Pattern Unidentified Hydrocarbons C6-C12 <br /> [6]Hydrocarbon pattern is present in the requested quantitation range but does not resemble the pattern of the requested fuel <br /> K IWprocess\J5 BP AR=21301Quarteriy\1 QTR 0312130 GWMR 1Q03 13 of 13 <br />