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A I <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 mil) (feet bgs) (feet msl) (feet bgs) ug/L ug/L uglL ug/L ug/L ug/L (ppm) <br /> NA=Not analyzed NS=Not sampled NE=Not evaluated <br /> incl=mean sea level bgs=below ground surface <br /> =measurement not taken <br /> uglf.=Analytical results in nacrograms per liter <br /> TPHG=Total petroleumhydrocar'oons as gasoline <br /> [=Below detection limit for analytical methods used <br /> *=Raised method reporting limit due to lugh analyte concentration requumg sample dilution <br /> *■a Raised method reporting Jurat due to matrir interference <br /> MtBE was analyzed usmgUSEPA Method 8260 unless noted otherwise(see below) <br /> [1]=MTBE was analyzed using USEPA Method 8020 <br /> [2]=Water levels collected on 1115199 samples collected on 12!17199 due to equipment failure <br /> [3]=Water level collected on 2125100 <br /> [4]ChromatogramPattera Gasoline C6-C12 <br /> [5]ChromatogramPattem Weathered Gasoline C6 C12 <br /> [6]Chromatogram Pattern Weathered Gasoline C6 C12+Unidentified Hydrocarbons C6 C12 <br /> [7]ChromatogramPattem Unidentified Hydrocarbons C6 C12 <br /> [81 Hydrocarbon pattern m present in the requested fuel quantitation range but does not resemble <br /> the pattern of the requested fuel <br /> [91 SinTle was re analyzed outside of USEPA recormnended hold time at a dilution <br /> [10]The sample was diluted due to the presence of high levels of non target analytes resulting in <br /> below elevated reporting limits <br /> Numbers in column next to well designation indicate discrete depth samples m feet bgs <br /> Beginning 6113102 analytical data validation is provided in the tend <br /> K V5 BP ARCM021681Quarterlyll QTR 0312168 GWMR 1Q03 <br /> 9of9 <br />