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TOE Groundwater Monitoring and Analytical Data Former ARCO Service Station No.2168 441 Charter Way Stockton,California i Elevation Top of Static Water Groundwater Depth to Ethyl- Total Dissolved Well ID Casing(feet Level Elevation Screen TPHG Benzene Toluene benzene Xylenes MtBE Oxygen &Sample Date mel) (feet bgs) (feet msl) (feet bgs) ug/L ug/L ug/L ug/L ug/L ug/L (mg/L) 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 11/21/2000 19.19 -10.18 <50 0.692 <0.5 <0.5 <0.5 Q NA 2/15/2001 20.55 -11.54 <50 1.84 1.73 <50 1.94 Q 2.0 05/17/01 _ t3.6� 19.95 -10.94 <50 0.861 <0.5 <0.5 <0.5 Q 2.0 8/16/2001 21.41 -12.40 <50 0.71 <0.5 <0.5 <0.5 Q 4.4 12/6/2001 22.28 -13.27 150 47 1.2 12 4.5 <0.50 1.3 2/14/2002 20.64 -11.63 <500[9] 120[9] <5.0[9] 18[9] <5.0[9] 1.3 1.8 6/13/2002 21.10 -12.09 <50 6.8 <0.50 <0.50 0.62 0.54 1.8 8/22/2002 22.13 -13.12 <50 0.56 <0.50 <0.50 <0.50 0.62 3.6 11/13/2002 23.03 -14.02 <50 0.66 <0.50 <0.50 <0.50 0.72 -- 2/12/2003 24.77 -15.76 <50 <0.5 <0.5 <0.5 <0.5 0.78 1.8 5/29/2003 21.67 -12.66 <50 <0.5 <0.5 <0.5 41.5 0.85 5.1 NA =Not analyzed. NS=Not sampled" NE-Not evaluated. mal-mean sea level bgs-below ground surface ---measurement not taken ug/L=Analytical results in micrograms per liter TPHG-Total petrolemr hydrocarbons as gasoline. <-Below detection limit for analytical methods used. *=Raised method reporting limit due to high analyte mncenaation requiring sample dilution. **=Raised method reporting limit due to matrix interference. MtBE was analyzed using USEPA Method 8260,unless noted otherwise(see below). [I]-MTBE was analyzed using USEPA Method 8020. [2]-Water levels collected on 11/5!99;samples collected on 12/17/99 due to equipment failure. [31=Water level collected on 1115100. It [41 Clromatog am Pattern:Gasoline C6-C12 [5]Clwmawgrarn Pattern:Weathered Gasoline C6-C 12 [6]Chromatogrami Pattern:Weathered Gasoline C6-C 12+Unidentified Hydrocarbons C&C12 [7]Chromatogram Pattern:Unidentified Hydrocarbons C6-C12 [8]Hydrocarbon pattern is present it the requested fuel quantitation range but does not resemble tho pattern of the requested fuel. [91 Sample was reanalyzed outside of USEPA rcoommended hold time at a dilution. 1101 The sample was diluted due to the presence of high levels of non-target analytes resulting in below elevated reporting limits. Numbers in column next to well designation indicate discrete depth samples in feet bgs Belle i�nnin 6/13/02,analytical data validation is provided in the text k:115 BP ARC010216MQuarkdy12168 GWMR 2Q01xls 9of9