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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 Water Groundwater 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 ug/L ug/L ug/L (mg/L) <br /> MW-8C 8/30/2000 9.01 21.21 -12.20 105.0 68.5 15.6 6.78 2.18 7.58 <2 NA <br /> 11/21/2000 --1;..70 19.19 -10.18 <50 0.692 <0.5 <0.5 <0.5 <2 NA <br /> 2/15/2001 -------_ 20.55 -11.54 <50 1.84 1.73 <50 1.94 <2 2.0 <br /> 05/17/01 _ [3.6 19.95 -10.94 <50 0.861 <0.5 <0.5 <0.5 <2 2.0 <br /> 8/16/2001 21.41 -12.40 <50 0.71 <0.5 <0.5 <0.5 <2 4.4 <br /> 12/6/2001 22.28 -13.27 150 47 1.2 12 4.5 <0.50 1.3 <br /> 2/14/2002 20.64 -11.63 <500[9] 120[9] <5.0[9] 18[9] <5.0[9] 1.3 1.8 <br /> 6/13/2002 21.10 -12.09 <50 6.8 <0.50 <0.50 0.62 0.54 1.8 <br /> 8/22/2002 22.13 -13.12 <50 0.56 <0.50 <0.50 <0.50 0.62 3.6 <br /> 11/13/2002 23.03 -14.02 <50 0.66 <0.50 <0.50 <0.50 0.72 <br /> 2/12/2003 24.77 -15.76 <50 <0.5 <0.5 <0.5 <0.5 0.78 1.8 <br /> 5/29/2003 21.67 -12.66 X50 <0.5 <0.5 <0.5 <0.5 0.85 5.1 <br /> NA=Not analyzed. NS=Not sampled. NE=Not evaluated <br /> msl=mean sea level bgs=below ground surface <br /> =measurement not taken <br /> ug/L=Analytical results in micrograms per liter <br /> TPHG=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 dilution. <br /> **=Raised method reporting limit due to matrix interference. <br /> MtBE was analyzed using USEPA Method 8260,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 /> [3]=Water level collected on 2/25/00. ! <br /> [4]Chromatogram Pattern:Gasoline C6-C12 <br /> [5]Chromatogram Pattern:Weathered Gasoline C6-C12 <br /> [6]Chromatogram Pattern:Weathered Gasoline C6-C12+Unidentified Hydrocarbons C6-C 12 <br /> [7]Chromatogram Pattern:Unidentified Hydrocarbons C6-C 12 <br /> [8]Hydrocarbon pattern is present in the requested fuel quantitation range but does not resemble <br /> the pattern of the requested fuel <br /> r <br /> [9]Sample was reanalyzed outside of USEPA recommended 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 repotting 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 /> k:V5 BP ARCO\02168\Quarterly\2168 GWMR 2Q03.xls <br /> 9of9 <br />