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Vale 1 0 Page 5 of 7 b 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 Elevation TPHG Benzene Toluene benzene Xylene MTBE Observations MW-7 09/18/96 14 16 53 50 5043 -3627 <50 <0 5 <0 5 <05 <0 5 <3 No FP,No S MW-7 11/26/96 14 16 5350 4830 -3414 <50 <05 <0 5 <05 <0 5 <3 No FP,No S MW-7 03/24/97 1416 5350 4320 -2904 <200*** <2** <0 5 <0 5 <0 5 <4** No FP,No S MW-7 05/20/97 1416 5350 4381 -2965 <50 <0 5 <0 5 <0 5 <0 S <3 No FP,No S MW-7 08/19/97 1416 5350 4725 -3309 <50 <0 5 <0 5 <0 5 <0 5 <5 No FP, No S MW-7 11/19/97 14 16 5350 4542 -3126 <50 2 6 2 9 0 80 4 5 <5 No FP, No S MW-7 03/04/98 1416 5350 4077 -2661 <50 <05 <05 <05 <0 5 <5 No FP,No S MW-7 06/26/98 1416 53 50 3857 -2441 <50 <05 <0 5 <0 5 <05 <5 No FP,No S MW-7 09/01/98 1416 5350 4042 -2626 <50 <0 5 <0 5 <0 5 <05 <5 No FP,No S MW-8 02/28/95 1416 5650 5354 -3938 <50 <0 5 13 <05 <0 5 NA No FP, No S MW-8 05/19/95 1416 5650 5166 -3750 55*** <0 5 <05 <05 <0 5 NA No FP, No S MW-8 08/28/95 1416 5650 5334 -3918 <50 <05 <0 5 <05 <0 5 NA No FP, No S MW-8 12/07/95 1416 5650 5202 -3786 <50 <05 <0 5 <05 <0 5 NA No FP,No S MW-8 02/05/96 NOT SAMPLED"] No FP, No S MW-8 05/30/96 NOT SAMPLEO'l No FP,No S MW-8 07/28/96 WELL DESTROYED MW-10 02/28/95 1438 53 00 5424 -3986 300 0 9 <0 5 <0 5 <0 5 NA No F'P,No S MW-10 05/19/95 1438 5300 5232 -3794 370 0 9 <0 5 <05 <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 -3823 490 0 7 <0 5 <05 <0 5 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 53 00 4709 -3271 350*** <6** <05 <05 <0 5 <6** No FP,No S MW-10 09/18/96 1438 5300 5084 -3646 510 <15** 10 <05 <0 5 <9** No FP, No S CP1D\QMR�3RDQTRARC0\2130Q398 XLS Table 1 �[K�tQGQC 11/16/98