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Table 1 Page 6 of 8 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 Casmg Top of Screen Level Elevation TPHG Benzene Toluene benzene Xylene MTBE Observations MW-8 02/28/95 14 16 5650 53 54 -3938 <50 <0 5 13 <05 <0 5 NA No FP, No S MW-8 05/19/95 14 16 5650 5166 -3750 55*** <0 5 <0 5 <0 5 <0 5 NA No FP, No S MW-8 08/28/95 1416 5650 5334 -3918 <50 <0 5 <0 5 <0 5 <0 5 NA No FP, No S MW-8 12/07/95 1416 5650 5202 -3786 <50 <0 5 <0 5 <0 5 <0 5 NA No FP, No S MW-8 02/05/96 NOT SAMPLEDr" No FP, No S MW-8 05/30/96 NOT SAMPLEDII] No FP, No S MW-8 07/28/96 WELL DESTROYED MW-10 02/28/95 1438 5300 5424 -3986 300 0 9 <0 5 <0 5 <0 5 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 5300 53 70 -3932 420 12 <0 5 <0 5 <0 5 NA No FP, No S MW-10 12/07/95 1438 5300 5261 -38 23 490 0 7 <0 5 <05 <0 5 NA No FP, No S MW-10 02/05/96 1438 5300 5013 -3575 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 50 84 -3646 510 <15** 10 <0 5 <0 5 <9** No FP, No S MW-10 11/26/96 1438 53 00 4872 -3434 <600*** <05 <05 <0 5 <0 5 <10** No FP, No S MW-10 03/24/97 1438 5300 4377 -2939 <500*** <5** <0 8** <0 5 <05 <7** No FP,No S MW-10 05/20/97 1438 5300 4420 -2982 460 <5** <0 5 <0 5 <05 <7** No FP, No S MW-10 08/19/97 1438 5300 4766 -3328 440 <0 5 <0 5 <0 5 <05 <5 No FP, No S MW-10 11/19/97 1438 5300 45 95 -3157 510 2 2 2 2 0 93 3 1 <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 5300 3911 -24 73 329 475 <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 <0 5 <5 No FP, No S MW-10 12/02/98 1438 53 00 3823 -2385 407 6 89 <05 <0 5 0 873 195 No FP, No S CP1E WRC0121301QTRLY\1_130Q199 XLS Table 1 � 2