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• TAG)1 <br /> HISTORICAL GROUNDWATER MONITORING DATA <br /> Former ARCO Service Station No 2168 <br /> 441 Charter Way <br /> Stockton Cahforrua <br /> Elevation <br /> Top of Static Water Water Depth to Ethyl- Total Dissolved <br /> Well ID Casing(feet Level Elevation Screen TPHG Benzene Toluene benzene Xylenes MtBE Oxygen <br /> &Sample Date msl) (feet bgs) (feet msl) (feet bgs) ug/L ug/L ug/L ug1L ag/L ug/L (ppm) <br /> NA=Notaaalyzed. NS=Notsarrpled NE=Notevaluated <br /> rral=meat sea level bgs=below ground surface <br /> =measurerrr t not taken <br /> ug/L=Analytical results m mrcrograrm per hoer <br /> TPHG=Total petroleurnhydrocarbons as gasoline. <br /> =Below detection lumt for analytical methods used <br /> fi=Raised method reportmglarut due to]ugh analyte concentration requumg sample dtlutren <br /> •"=Raised method reporting]arid due to matrix interference <br /> MtBE was analyzed wingUS13PA Method 8260 unless noted otherwsse(see below) <br /> [1]=MTBE was analyzed usmgMEPA Method 8020 <br /> (2]=Water levels collected on 1€15199 samples collected on 12/17/99 due to equipment failure <br /> [3]=Water level collected on 2125/00 <br /> [4]ChrosmtogramPattern QuohncC6Ct2 <br /> [5]Chromatogram Pattern Weathered Gasoline C6 C12 <br /> (6]Chromatog unPattern Weathered Gasoline C6 C12+Unidentified Hydrocarbons C6 C12 <br /> (7)ChromatogramPattem UntdeatrftedHydrocarbons C6 C12 <br /> (g]Hydrocarbon pattern is present in the requested fael quantitation range but does not resemble <br /> the pattem of the requested fuel <br /> [9]Sample was re-analyzed outside of USEPA recommended hold tare at a dilution <br /> [10]The sample was diluted due to the presence of}ugh levels of non target analytes resulting in <br /> below elevated reporting 3urati <br /> Numbers in cohrtm next to well designation indicate discrete depth samples in feet bgs <br /> Begmnmg 6113102 analytical data validation is provided in the text <br /> i <br /> 1 <br /> k US BP ARC01021681Quarterly12169 GWMR4Q02 <br /> 9of9 <br />