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Table 1 Groundwater Monitoring Data 1995 to Present ARCO Service Station No. 2130 7906 North El Dorado Street, Stockton, California Page 7 of 9 Well Elevation Static Water Groundwater Ethyl- Total Number Date Top of Casing Top of Screen Level Elevation 7 PHG Benzene Toluene benzene Xylene MTBE Observations MW-10 03/24/97 1438 4377 -2939 <500*** <5** <08** <0 5 <0 5 <7** No FP,No S MW-10 05/20/97 1438 4420 -29 82 460 <5** <05 <0 5 <05 <7** No FP,No S MW-10 08/19/97 1438 4766 -33 28 440 <0 5 <0 5 <0 5 <0 5 <5 No FP,No S MW-10 11/19/97 1438 4595 -3157 510 2 2 2 2 093 31 <5 No FP,No S MW-10 03/04/98 1438 4143 -2705 110 066 <0 5 <0 5 <0 5 <5 No FP,No S MW-10 06/26/98 1438 3911 -24 73 329 475 <0 5 <0 5 <0 5 <5 No FP,No S MW-10 09/01/98 1438 4078 -2640 295 <0 5 <0 5 <0 5 <0 5 <5 No FP,No S MW-10 12/02/98 1438 38 23 -2385 407 6 89 <05 <0 5 0 873 19 5 No FP,No S MW-10 03/31/99 1438 3471 -20 33 217 641 0 948 0 763 269 748 No FP,No S MW-10 06/04/99 1438 35 86 -2148 288 <0 5 <0 5 <0 5 <0 5 6 53 No FP,No S MW-10 09/02/99 1438 4026 -2588 152 <0 5 <0 5 <0 5 <0 5 <5 No FP,No S MW-10 11/29/99 1438 3858 -24 20 198 358 <0 5 <0 5 061 908 No FP,No S MW-10 03/16/00 1438 3469 -20 31 270 0 741 <0 5 <0 5 <05 59S 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 4175 NE NA NA NA NA NA NA NA VW-1 12/02/98 NM 3843 NE NA NA NA NA NA NA NA VW-1 03/31/99 NM 3891 NE NA NA NA NA NA NA NA VW-1 06/04/99 NM 3578 NE NA NA NA NA NA NA NA VW-1 09/02/99 NM 4030 NE NA NA NA NA NA NA NA VW-1 11/29/99 NM 3849 NE NA NA NA NA NA NA NA VW-1 03/16/00 NM 3452 NE NA NA NA NA NA NA NA VW-7 05/20/97 NM 3500 4505 NE 56 06 <0 5 <0 5 08 4 No FP,No S VW-7 09/01/98 NM 4163 NE NA NA NA NA NA NA NA VW-7 12/02/98 NM 3895 NE NA NA NA NA NA NA NA VW-7 03/31/99 NM 3886 NE NA NA NA NA NA NA NA ji VW-7 06/04/99 NM 3663 NE NA NA NA NA NA NA NA crlc 1AucxtVE�, RCO\2130\QTR,Y12130g1oo IT Corporation 5/2/00