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qW Tal • Groundwater Monitoring Data ARCO Service Station No. 2186 Page 2 of 2 3212 North California Street Stockton, California ell FS Elevation of Static Water[l] Top of Elevation of Total No. Date Top of Casing Level Screen[2] Groundwater TPHG Benzene Toluene Eth lbenzene X lenes MTBE [3] Observations MW-3 (cont.) 09/19/96 14.55 53.26 -38.71 <50 <0.5 <0.5 <0.5 <0.5 <3 No FP,No S 11/27/96 14.55 50.51 -35.96 <50 <0.5 <0.5 <0.5 <0.5 <3 No FP,No S 03/21/97 14.55 4197 -27.42 <50 <0.5 <0.5 <0.5 <0.5 <3 No FP,No S 05/22/97 14.55 43.61 -29.06 <50 <0.5 <0.5 <0.5 <0.5 <3 No FP,No S 08/20/97 14.55 49.43 -34.88 <50 <0.5 <0.5 <0.5 <0.5 <5 No FP,No S 11/20/97 14.55 48.82 -34.27 <50 <0.5 <0.5 <0.5 <0.5 <5 No FP,No S 02/17/98 14.55 44.18 -29.63 <50 <0.5 <0.5 <0.5 <0.5 <5 No FP,No S MW4 11/20/97 13.83 48.36 45.00 -34.53 89 1.0 1.1 0.63 2.0 11 No FP,No S 02/17/98 13.83 43.55 -29.72 180 0.57 <0.5 <0.5 0.59 29 No FP,No S VW-3 05/23/96 NM 45.76 41.80 NM 290 <0.5 <0.5 <0.5 <0.5 <3 No FP,No S 09/19/96 54.02 NM 310 <0.5 <0.5 <0.5 <0.5 <3 No FP,No S 11/27/96 NM 51.15 NM 280 <0.5 <0.5 <0.5 <0.5 <3 No FP,No S 03/21/97 NM 42.49 NM 180 <0.5 <0.5 <0.5 <0.5 <3 No FP,No S 05/22/97 NM 44.28 NM 240 <0.5 <0.5 <0.5 <0.5 <3 No FP,No S 08/20/97 NM 50.21 NM 200 <0.5 <0.5 <0.5 <0.5 <5 No FP,No S 11/20/97 NM 49.46 NM 160 4.6 4.4 2.6 6.7 <5 No FP,No S 02/17/98 NM 44.72 NM 93 <0.5 <0.5 <0.5 <0.5 <5 No FP,No S HG=Total petroleum hydrocarbons as gasoline. E=Methyl tert-butyl ether. [1]Measured below top of casing. [2]Measured from ground surface. [3]MTBE was analyzed using USEPA Method 8024. =Raised MRL due to high analyte concentration requiring sample dilution. *=Reporting limit raised due to matrix interference. FP=Free product.Measured in feet. Analytical results in parts per billion(ppb). S=Sheen. levation datum is mean sea level. NM=Not measured. =Below detection limit for the analytical method used NA=Not analyzed N.\3 LW905\14704\031698MlXLS 4116/98 Sheetl