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S oe1 Page 5 of 5 Groundwater Monitoring Data ARCO Service Station No. 548, 1612 Hammer Lane, Stockton, California Well Elevation Static Top Elevation Sample of Top Water of of Ethyl- Total Number Date ofCasmg Level Screen Groundwater TPHG Benzene Toluene benzene Xylenes MTBE Observations MW-5(cont.) MW-5(60) 08/12/97 937 3276 -2339 3,600 260 12 260 350 110 No FP,No S,Yes 0 MW-5(61) 11/18/97 937 3249 -23 12 1,300 180 12 18 88 *<2511] No FP,No S,No 0 MW-6 MW-6(58) 12/16/93 895 4277 4000 -3382 <50 <05 <06 <0 5 <05 NA No FP,No S,No 0 MW-6(39) 04/08/94 895 3973 -3078 28 48 39 39 22 NA No FP,No S,O=NE MW-6 06/22/94 895 4031 -3136 <10 <03 <03 <03 <05 NA No FP,No S,O=NE MW-6(43) 09/23/94 895 4259 -3364 <50 <0 5 <05 <05 <05 NA No FP,No S,O=NE MW-6(46) 12/02/94 895 4166 -3271 <50 <05 <0 5 <05 <0 5 NA No FP,No S,O=NE MW-6(58) 02/15/95 895 4002 -3107 <50 <0 5 <05 <0 5 <05 NA No FP,No S,O=NE MW-6(58) 05/12/95 895 3826 -2931 <50 <05 <0 5 <0 5 <05 NA No FP,No S,No 0 MW-6(59) 08/29/95 895 3991 -3096 *<52 <0 5 <05 <0 5 <05 NA No FP,No S,No 0 MW-6(58) 12/04/95 895 3838 -2943 *<70 <05 <05 <05 <05 NA No FP,No S,No 0 MW-6 02/02/96 895 3638 -2743 <50 <05 <05 <0 5 <05 NA No FP,No S,No 0 MW-6(59) 05/10/96 895 3388 -2493 <50 <0 5 <05 <0 5 <05 <3 No FP,No S,No 0 MW-6(59) 08/29/96 895 3566 -2671 <50 <05 <05 <05 <05 <3 No FP,No S,No 0 MW-6(59) 11/20/96 895 3457 -2562 <50 <05 <05 <0 5 <0 5 <3 No FP,No S,No 0 MW-6(57) 03/19/97 895 3083 -2188 <50 <05 <05 <05 <0 5 <3 No FP,No S,No 0 MW-6 05/27/97 895 31 16 -2221 <50 <0 5 <05 <05 <0 5 <3 No FP,No S,No 0 MW-6(59) 08/12/97 895 3255 -2360 <50 <0 5 <05 <05 <05 <5 No FP,No S,No 0 MW-6(57) 11/18/97 895 3219 -2324 54 59 58 16 92 <5 No FP,No S,No 0 Analytical results in pans per billion HG-Total petroleum hydrocarbons as gasoline MTBE Methyl ten butylether Elevation datum is mean sea level Measurements in feet NA-Not analyzed NM-Not measured NE-Not evaluated *-Raised MILL due to matrix interference **-The sample contains a lower boiling point hydrocarbon mixture quantified as gasoline the chromatogram does not match the typical gasoline fingerprint ***-Raised MRI.due to high analyte concentration requiring sample dilution Bailer blank FP-Fme product S- Sheen O-Obvious product odor < Below detection Joints used by laboratory Sample designations tit During the 11118/97 sampling event,MTBE was also analyzed using USEPA Method 8260;see Table 2 MW-4(34)-Well ID and sample depth(feet) s N\x1s\0805\d4007V21697MI XLS EMCOR Sheetl 1119198