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TABLE 2 Historical Groundwater Monitoring & Analytical Data Former Chevron Service Station No. 94064 2103 Country Club Boulevard, Stockton, California Well No. Date Notes TOC (ft-MSL) Depth to Water (ft) SPH (ft) GWE (ft-MSL) TPH- DRO TPH- GRO (pg/L) 8 (pg/L) T (pg/L) E (pg/L) X (pg/L) MTBE (pg/L) TBA (pg/L) TAME (pg/L) 1,2- DCA (pg/L) EDB (pg/L) D.O. (mg/L) Comments TRIP BLANK 05/31/00 <50 <0.50 <050 <050 <050 <25 TRIP BLANK 08/25/00 <50 <0.50 <050 <0 50 <050 <25 TRIP BLANK 12/02/00 - -- -- -- TRIP BLANK 02/14/01 -- - -- TRIP BLANK 05/16/01 - <50 <0.50 <0.50 <050 <050 <2 5 TRIP BLANK 08/21/01 - - - - _ <50 <0.50 <0.50 <050 <050 <25 Lot_es: TPH-DRO = Total petroleum hydrocarbons as diesel range organics TPH-GRO = Total petroleum hydrocarbons as gasoline range organics B = Benzene T = Toluene E = Ethylbenzene X = Total xylenes MTBE = Methyl Tert-Butyl Ether TBA = Tert-Butyl Alcohol TAME = Tert-Amyl Methyl Ether 1,2-DCA = 1,2-Dichloroethane EDB = 12-Dibromoethane D.O. = Dissolved Oxygen DTW = Depth to water TOC =Top of casing (surveyed) SPH = Separate phase hydrocarbons GWE = Groundwater Elevation Calc. GW Elev. = Calculated groundwater elevation = TOC - Depth to Water = 0.75-(Measured SPH Thickness); assuming a specific gravity of 0.75 for SPH ft-MSL = feet above mean sea level ft = feet pg/L = Micrograms per liter mg/L = Miligrams per liter <= Analyte was not detected above the specified method reporting limit = Not measured or analyzed INA = Well inaccessible, well not sampled Refer to the reports in which data was first presented for more information on historical data. 94054 GW Tables.xls Page 29 of 29 Stantec