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TABLE 1 • Groundwater Elevation and Analytical Data ARCO Service Station No.2186 3212 North California Street,Stockton,California TOC Static Water[1] Screen Groundwater Ethyl- Total Well Sample Elevation Level Interval Elevation Groundwater TPHg Benzene Toluene benzene Xylenes MtBE[3] Sample No. Date ft msl ftbs ftbs ft msl Flow Direction N P91L p P91L p Observations VW-3B 09/13/01 [8] 46.19 -31.18 E-NE <50 <0.5 <0.5 <0.5 <0.5 90[4] No FP,No S (cont) 12/1112001 43.41 -28.40 NE <50 <0.50 <0.50 <0.50 <0.50 200[4] No FP,No S 3/14/2002 40.37 -25.36 E-NE <50 <0.50 <0.50 <0.50 <0.50 26[4] No FP,No S 6/19/2002 42.71 -27.70 E-NE 460[7] <0.50 <0.50 <0.50 <0.50 1,500[4] No FP,No S 9/12/2002 49.60 -34.59 E-NE 320 <2.5 <2.5 <2.5 <2.5 140 No FP,No S 12/3/2002 46.60 -31.59 E-NE <500 <5.0 <5.0 <5.0 <5.0 69 No FP,No S 3/11/2003 46.51 -31.50 NE 380 <2.5 <2.5 <2.5 <2.5 370 No FP,No 6/9/2003 42.39 -27.38 E-NE 2,600 <10 <10 <10 <10 6,900 No FP,No 9/17/2003 51.62 -36.61 NE 11OR <5.0 <5.0 <5.0 <5.0 210 No FP,No S 12/11/2003 46.38 -31.37 NE-SW 16,000 1,100 930 1,100 4,300 3,500 No FP,No S Notes: < = Below detection limit for the analytical method used. msl = mean sea level = Raised MRL due to high analyte concentration requiring sample dilution. MtBE = Methyl tert-butyl ether. " = Reporting limit raised due to matrix interference. NA = Not analyzed. bgs = below ground surface NM = Not measured. FP = Free product.Measured in feet. NS = Not sampled. ft =feet S = Sheen. TOC =Top of Casing [i]Measured below top of casing. TPHg = Total petroleum hydrocarbons as gasoline(reported as GRO-gasoline range organics) [2]Measured from ground surface. pg/L = micrograms per Liter [3]MtBE was analyzed using USEPA Method 8020. [4]M18E was analyzed using USEPA Method 8260. [5]Chromatogram Pattern:Weathered Gasoline C6-C-12 [6]Sample analyzed outside USEPA recommended hold time [7]Hydrocarbon pattern is present in the requested fuel quantitation range,but does not resemble the pattern of the requested fuel. [8J On the chain-of-custody forms,samples were identified as MW-18,MW-2B,and MW-313,respectively Data Qualifier Definitions: U The analyte was analyzed for,but was not detected above the sample reporting limit. J The analyte was positively identified;the associated numerical value is the approximate concentration of the analyte in the sample. N The analysis indicates the presence of an analyte for which there is presumptive evidence to make a"tentative identification." NJ The analysis indicates the presence of an analyte that has been"tentatively identified"and the associated numerical value represents its approximate concentration. UJ The analyte was not detected above the reported sample reporting limit. However,the reported reporting limit is approximate and may or may not represent the actual limit of quantitation necessary to accurately and precisely measure the analyte in the sample. R The sample results are rejected due to identification or other analytical issues. ND Not detected above reported detection limit KAWpocess16l5 5P ARCC%02i watarteam oTn 03%2188 GWMR 4CM Page 8 of 8