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TW 1 <br /> 4of4 <br /> Groundwater Monitoring Data <br /> ARCO Service Station No 548, 1612 Hammer Lane, Stockton, California <br /> Well Elevation Static Elevation <br /> Sample of Top Water of Ethyl- Total <br /> Number Date of Casing Level Groundwater TPHG Benzene Toluene benzene Xylenes MTBE Observations <br /> MW-6 <br /> MW-6(58) 12/16/93 8 95 4277 -3382 <50 <0 5 <0 6 <0 5 <05 No FP,No S,No 0 <br /> MW-6(39) 04/08/94 895 3973 -3078 28 4 8 39 39 2 2 No FP,No S,O=NE <br /> MW-6 06/22/94 895 4031 -31 36 <10 <0 3 <0 3 <0 3 <0 5 No FP,No S,O=NE <br /> MW-6(43) 09/23/94 895 4259 -33 64 <50 <0 5 <0 5 <0 5 <0 5 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 No FP,No S,O=NE <br /> MW-6(58) 02/15/95 895 4002 -3107 <50 <0 5 <0 5 <0 5 <0 5 No FP,No S,O=NE <br /> MW-6(58) 05/12/95 895 38 26 -2931 <50 <0 5 <0 5 <0 5 <0 5 No FP No S No O <br /> MW-6(59) 08/29/95 895 39 91 -3096 **<52 <0 5 <0 5 <0 5 <0 5 No FP,No S,No O <br /> MW-6(58) 12/04/95 895 3838 -2943 **<70 <0 5 <0 5 <05 <0 5 No FP,No S,No O <br /> N1W-6 02/02/96 895 3638 -2743 <50 <0 5 <0 5 <0 5 <0 5 No FP, No S,No 0 <br /> MW-6(59) 05/10/96 895 3388 -24 93 <50 <0 5 <0 5 <0 5 <0 5 <3 No FP,No S,No 0 <br /> Analytical results to parts per billion <br /> HG-Total petroleum hydrocarbons as gasoline <br /> MTBE Me(h31 terthut)tether <br /> Elevation datum is mean sea level <br /> Measurements in feet <br /> NS Not sampled NM Not measured NE Not evaluated <br /> *-Well paved o,.er on 03/04/93 ** Raised MRI.due to matrix interference <br /> *** The sample contains a lower boiling point hydrocarbon mixture quantified as gasoline,the chromatogram does not march the typical gasoline fingerprint <br /> Sailer blank FP-Free product S Sheen O Obvious product odor <br /> <-Below detection limits used by laboratory <br /> Sample designations <br /> MW 4(34) Well ID and sample de (feet) <br /> N\els\0805\1a005\061996M1 xls Revision 2 7126/96 <br />