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Al Groundwater Elevation and Analytical Data ARCO Service Station No 2186 3212 North California Street Stockton,California TOC Static Water[i] Screen Groundwater Ethyl- Total Well Sample Elevation Level Interval Elevation Groundwater TPI-19 Benzene Toluene benzene Xylenes MtBE[3] Sample No Date ft msl ftbs ftbs ft msl Flow Direction IL p L P91L p L Observations VW 38 09/13/01 [8] 4619 -31 18 E NE <50 <0 5 <0 5 <0 5 <0 5 90[4] No FP,No S (cont) 12/11/2001 4341 -2840 NE <50 <0 50 <050 <0 50 <0 50 200[4] No FP,No S 3/14/2002 4037 2536 E-NE <50 <0 50 <050 <0 50 <0 50 26[4] No FF.No S 6/19/2002 4271 2770 E-NE 460[7] <0 50 <0 50 <0 50 <0 50 1,500[4] No FP,No S 9/12/2002 4960 3459 E-NE 320 <2 5 <2 5 <25 <2 5 140 No FP,No S 12/3/2002 4660 3159 E NE <500 <50 <50 <50 <50 69 No FP,No S 3/11/2003 4651 31 50 NE 380 <2 5 <2 5 <2 5 <2 5 370 No FP,No S 6/9/2003 4239 2738 E-NE 2,600 <10 <10 <10 <10 6,900 No FP,No S 9/17/2003 51 62 -3661 NE 11 OR <5 0 <50 <50 <50 210 No FP,No S 12/11/2003 4638 -3137 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 msi = mean sea level = Raised MRL due to high analyte concentration requiring sample dilution MtBE = Methyl tort 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 =feel S = Sheen TOC =Top of Casing [1]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]MtBE was analyzed using USEPA Method 8260 [5]Chromatogram Pattern Weathered Gasoline C6 C 12 1 [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 [8]On the chain of custody forms,samples were identified as MW-1 B,MW 28,and MW-3B,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 analysts indicates the presence of an analyte for which there is presumptive evidence to make a Yentative 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 K 1WprocessV5 5P AR=0218610uarteriyl4 QTR 0312186 GWMR 4003 Page 8 of 8