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i <br /> TABLE 1 <br /> Groundwater Monitoring and Analytical Data <br /> Former ARCO Service Station No 2168 <br /> 441 Charter Way <br /> Stockton, California <br /> Elevation <br /> Top of Static Groundwater Depth to Ethyl- Total Dissolved <br /> Well ID Casing Water Level Elevation Screen TPHG Benzene Toluene benzene Xylenes MtBE Oxygen <br /> &Sample Date (feet rnsl) (feet bgs) (feet msl) (feet bgs) ug/L ug/L ug/L ug/L ug/L ug/L (mg/L) <br /> NA =Not analyzed NS=Not sampled NE=Not evaluated <br /> msl=mean sea level bgs=below ground surface <br /> —=measurement not taken <br /> ugn.=Analytical results in micrograms per liter <br /> TPHQ=Total petroleum hydrocarbons as gasoline <br /> <=Below detection limit for analytical methods used <br /> =Raised method reporting limit due to high analyte concentration requiring sample difutton <br /> ` =Raised method reporting limit due to malnx interference <br /> MtBE was analyzed using USEPA Method 6260,unless noted otherwise(see below) <br /> [1)=MTBE was analyzed using USEPA Method 8020 <br /> [2)=Water levels collected on 11/5/99 samples collected on 12/17/99 due to equipment failure <br /> 131=Water level collected on 2/25/00 <br /> 141 Chromatogram Pattern Gasofine C6 C12 <br /> [5)Chromatogram Pattern Weathered Gasoline C6-C12 <br /> 161 Chromatogram Pattern Weathered Gasoline C6-C12+Unidentified Hydrocarbons C6 C12 <br /> [7j Chromatogram Pattern Unidentified Hydrocarbons C6 C12 <br /> [8)Hydrocarbon pattern is present in the requested fuel quanmation range but does not resemble <br /> the pattern of the requested fuel <br /> [9)Sample was to analyzed outside of USEPA recommended hold Sime at a dilution <br /> [101 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 in feet bgs <br /> Beginning 6/13/02 analytical data validation is provided in the text <br /> I <br /> K IWprocessU5 BP ARC01021681Quarferly\2 QTR 03~2168 GWMR 2003 <br /> 1001`10 <br />