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Tae 1 = Page 6 of 7 Groundwater Monitoring Data 1995 to Present ARCO Service Station No. 2130 7906 North EI Dorado Street, Stockton, California Well Elevation Static Water Groundwater Ethyl- Total Number Date Top of Casing Top of Screen Level EIevation TPHG Benzene Toluene benzene Xylene MTBE Observations MW-10 02/28/95 1438 5300 5424 -3986 300 0 9 <0 5 <0 5 <05 NA No FP,No S MW-10 05/19/95 1438 53 00 5232 -3794 370 0 9 <0 5 <0 5 <0 5 NA No FP,No S MW-10 08/28/95 1438 53 00 53 70 -3932 420 12 <05 <0 5 <0 5 NA No FP,No S MW-10 12/07/95 1438 5300 5261 -38 23 490 07 <0 5 <0 5 <05 NA No FP,No S MW-10 02/05/96 1438 5300 5013 -35 75 350 0 7 <0 5 <0 5 <0 5 NA No FP,No S MW-10 05/30/96 1438 5300 4709 -3271 350*** <6** <0 5 <0 5 <0 5 <6** No FP,No S MW-10 09/18/96 1438 5300 5084 -3646 510 <15** 10 <0 5 <05 <9** No FP,No S MW-10 11/26/96 1438 53 00 48 72 -3434 <600*** <0 5 <0 5 <0 5 <0 5 <10** No FP,No S MW-10 03/24/97 1438 5300 4377 -2939 <500*** <5** <0 8** <0 5 <0 5 <7** No FP,No S MW-10 05/20/97 1438 5300 4420 -2982 460 <5** <0 5 <0 5 <0 5 <7** No FP,No S MW-10 08/19/97 1438 53 00 4766 -3328 440 <0 5 <0 5 <0 5 <05 <5 No FP,No S MW-10 11/19/97 1438 5300 4595 -3157 510 2 2 2 2 0 93 31 <5 No FP, No S MW-10 03/04/98 1438 5300 4143 -2705 110 066 <0 5 <0 5 <0 5 <5 No FP,No S MW-10 06/26/98 1438 53 00 3911 -24 73 329 4 75 <0 5 <0 5 <0 5 <5 No FP,No S MW-10 09/01/98 1438 5300 4078 -2640 295 <0 5 <0 5 <0 5 <05 <5 No FP,No S MW-10 12/02/98 1438 5300 38 23 -23 85 407 6 89 <0 5 <0 5 0 873 195 No FP,No S VW-1 05/20/97 NM 4400 4416 NE 340,000 330 540 2,100 13,000 <1,200* No FP, No S VW-1 09/01/98 NM 4400 4175 NA NA NA NA NA NA NA NA VW-1 12/02/98 NM 4400 3843 NA NA NA NA NA NA NA NA VW-7 05/20/97 NM 3500 4505 NE 56 0 6 <0 5 <05 08 4 No FP, No S VW-7 09/01/98 NM 3500 4163 NA NA NA 'NA NA NA NA NA VW-7 12/02/98 NM 3500 38 95 NA NA NA NA NA NA NA NA CPRE ARc0\2130\QTRLY\2130Q498 Xi C Table i �LKKcccGe