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TS 1 • <br /> Groundwater Monitoring Data Page 5 of 5 <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 Casmg Level Screen Groundwater TPHG Benzene Toluene benzene Xylenes MTBE Observations <br /> MW-6(cont.) <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) 05/10/96 895 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 34 57 -2562 <50 <0 5 <0 5 <0 5 <0 5 <3 No FP, No S,No O <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 31 16 -2221 <50 <0 5 <0 5 <0-5 <0 5 <3 No FP,No S,No 0 <br /> Analytical results in parts per billion <br /> TPHG-Total petroleum hydrocarbons as gasoline <br /> MTBE Methyl-tert-butylether <br /> Elevation datum is mean sea level <br /> Measurements in feet <br /> NA-Not analyzed NM Not measured NE-Not evaluated <br /> *-Raised MRI,due to matrix interference <br /> ** The sample contains a lower boding point hydrocarbon nuxmre quantified as gasoline,the chromatogram does not match the typical gasoline fingetpma <br /> ***-Raised MRL due to high analyte concentration requiring sample dilution <br /> Bailer blanc FP Free product S Sheen O-Obvious product odor <br /> < Belo%detection limns used by laboratory <br /> Sample designations <br /> MW-4(34)-Well 11)and sample d (feet) <br /> N\xls\0805\14007\061897M1 XLS Emcon <br /> ChPPrl Revision 0 7/15/97 <br />