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<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 fl] Observations
<br /> W-5(cont)
<br /> MW-5(60) 11/2.0/96 937 3483 -2546 4,500 210 93 310 510 *<50 No FP,No S,Yes 0
<br /> MW-5(60) 03/19/97 937 31 12 -2175 6,200 420 68 360 590 ***<60 No FP,No S,Yes O
<br /> MW-5 05/27/97 937 3119 -2182 4,500 490 59 230 350 97 No FP,No S,Yes 0
<br /> MW-5(60) 08/12/97 937 3276 -2339 3,600 260 12 260 350 110 No FP,No S,Yes 0
<br /> MW-5(61) 11/18/97 937 3249 -23 12 1,300 180 12 18 88 *<25 No FP,No S,No O
<br /> MW-5(615) 02/16/98 937 2914 �2— -1977 630 110 <2 5 22 83 44 No FP,No S,Yes O
<br /> W-6
<br /> MW-6(58) 12/16/93 895 4277 4000 -3382 <50 <0 5 <0 6 <0 5 <0 5 NA No FP,No S,No 0
<br /> MW-6(39) 04/08/94 895 3973 -3078 28 48 39 39 22 NA No FP,No S,O=NE
<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,O=NE
<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 O
<br /> -6(59) 08119/95 895 3991 -3096 *<52 <0 5 <0 5 <0 5 <0 5 NA No FP,No S,No O
<br /> -6(58) 12/04/95 895 3838 -2943 *<70 <0 5 <0 5 <0 5 <0 5 NA No FP,No S,No O
<br /> -6 02/02/96 895 3638 -2743 <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S,No O
<br /> -6(59) 05/10/96 895 3388 -2493 <50 <0 5 <0 5 <0 5 <0 5 <3 No FP,No S,No O
<br /> MW-6(59)
<br /> 08/29/96 895 3566 -2671 <50 <0 5 <0 5 <0 5 <0 5 <3 No FP,No S,No O
<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 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 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 /> MW-6(57) 11/18/97 895 3219 -2324 54 59 58 16 92 <5 No FP,No S,No O
<br /> MW-6(57) 02/16/98 895 2883 `-10 -1988 <50 <0 5 <0 5 <0 5 <0 5 <5 No FP,No S,No O
<br /> Analyucal results in parts per billion
<br /> HG-Total petroleum hydrocaebons as gasoline.
<br /> MTBE-Methyl-cert-butylether
<br /> Elevation datum is mean sea level
<br /> Measurements in feet.
<br /> N\nW805V400M32398R1 XLS
<br /> Sheetl 4117/98
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