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s T4D 1 • <br /> Page 5 of 5 <br /> Groundwater Monitoring Data <br /> ARCO Service Station No. 548, 1612 Hammer Lane, Stockton, California <br /> Well Elevation Static Top Elevation <br /> Sample of Top Water of of Ethyl- Total <br /> Number Date of Casing Level Screen Groundwater TPHG Benzene Toluene benzene Xylenes MTBE Observations <br /> MW-6(cont) <br /> MW-6 06/22/94 895 4031 -3136 <10 <0 3 <0 3 <0 3 <0 5 NA No FP,No S,O=NE <br /> MW-6(43) 09/23/94 895 4259 -3364 <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S,O=NE <br /> MW-6(46) 12/02/94 895 4166 -3271 <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S,0=N <br /> MW-6(58) 02/15/95 895 4002 -3107 <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S,O=NE <br /> MW-6(58) 05/12/95 895 3826 -2931 <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S,No 0 <br /> MW-6(59) 08/29/95 895 3991 -3096 *<52 <0 5 <0 5 <0 5 <0 5 NA No FP,No S,No 0 <br /> MW-6(58) 12/04/95 895 3838 -2943 *<70 <0 5 <0 5 <0 5 <0 5 NA No FP,No S,No 0 <br /> MW-6 02/02/96 895 3638 -2743 <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S,No 0 <br /> MW-6(59) 05/10/96 995 3388 -2493 <50 <0 5 <0 5 <0 5 <0 5 <3 No FP,No S,No 0 <br /> MW-6(59) 08/29/96 895 3566 -2671 <50 <0 5 <0 5 <0 5 <0 5 <3 No FP,No S,No 0 <br /> MW-6(59) 11/20/96 895 3457 -2562 <50 <0 5 <0 5 <0 5 <0 5 <3 No FP,No S,No 0 <br /> MW-6(57) 03/19/97 895 3083 -2188 <50 <0 5 <0 5 <0 5 <0 5 <3 No FP,No S,No 0 <br /> MW-6 05/27/97 895 3116 -2221 <50 <0 5 <0 5 <0 5 <0 5 <3 No FP,No S,No 0 <br /> MW-6(59) 08/12/97 895 3255 -2360 <50 <0 5 <0 5 <0 5 <0 5 <5 No FP,No S,No 0 <br /> Analytical results in pans per billion <br /> HG-Total petroleum hydrocarbons as gasoline <br /> MTBE Methyl-tert-butylether <br /> Elevation datuin is mean sea level <br /> Measurements in feet <br /> NA-Not analyzed. NM-Not measured NE Not evaluated <br /> *-Raised MRL due to matrix interference <br /> ** The sample contains a lower boiling point hydrocarbon mixture quanufied as gasoline,the chromatogram does not match the typical gasoline fingerprint <br /> #**-Raised MRL due to high analyte concentration requiring sample dilution <br /> Bailer blank FP-Fmee product S- Sheen O Obvious product odor <br /> Below detedion limits used by laboratory <br /> Sample designations <br /> MW-4(34)-Well ID and sample depth(feet) <br /> N Ws\0805V 4007\093097M 1 XLS emton <br /> Sheet 10/1/97 <br />