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*e 1 Groundwater Monitoring Data ARCO Service Station No. 2130 Page 7 of 8 7906 North El 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 11/26/96 14 16 53 50 4830 -34 14 <50 <0 5 <0 5 <0 5 <0 5 <3 No FP, No S MW-7 03/24/97 14 16 53 50 43 20 -2904 <200*** <2** <0 5 <0 5 <0 5 <4** No FP, No S MW-7 05/20/97 14 16 53 50 43 81 -2965 <50 <0 5 <0 5 <0 5 <0 5 <3 No FP, No S MW-7 08/19/97 14 16 53 50 4725 -3309 <50 <0 5 <0 5 <0 5 <0 5 <5 No FP, No S MW-8 11/29/93 14 16 5886 -4440 69 <0 5 <0 5 <0 5 <0 5 NA No FP, No S MW-8 03/23/94 14 16 5361 -3945 340 57 66 9 3 42 NA No FP,No S MW-8 06/22/94 14 16 5375 -3959 <10 <0 3 <0 3 <0 3 <0 3 NA No FP,No S MW-8 09/28/94 1416 5741 -4325 <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S MW-8 12/01/94 1416 53 12 -3896 60 27 13 08 13 NA No FP, No S MW-8 02/28/95 1416 53 54 -3938 <50 <0 5 13 <0 5 <0 5 NA No FP,No S MW-8 05/19/95 14 16 5166 -3750 55*** <0 5 <0 5 <0 5 <0 5 NA No FP, No S MW-8 08/28/95 1416 53 34 -39 18 <50 <0 5 <0 5 <0 5 <0 5 NA No FP, No S MW-8 12/07/95 14 16 5202 -3786 <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S MW-8 02/05/96 NOT SAMPLED" No FP,No S MW-8 05/30/96 NOT SAMPLED" No FP, No S MW-8 07/28/96 WELL DESTROYED MW-10 11/29/93 1438 53 00 5930 -4492 1,000 <11** <3** <1* 10 NA No FP, No S MW-10 03/23/94 1438 5300 5436 -3998 1,300 6 6 61 16 3 6 NA No FP,No S MW-10 06/22/94 1438 53 00 5435 -3997 1,600 5 0 15 3 3 55 NA No FP, No S MW-10 09/28/94 1438 5300 58 11 -4367 NA NA NA NA NA NA No FP, No S MW-10 09/29/94 --- --- --- 1,100 <0 5 <0 5 3 6 4 0 NA No FP, No S MW-10 12/01/94 1438 5300 57 15 -4277 800 <0 5 2 3 0 8 l 3 NA No FP,No S 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 5300 5232 -37 94 370 0 9 <0 5 <0 5 <0 5 NA No FP,No S MW-10 08/28/95 1438 5300 5370 -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 <0 5 <0 5 NA No FP, No S MW-10 02/05/96 1438 5300 50 13 -3575 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** <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 48 72 -3434 <600*** <0 5 <0 5 <0 5 <0 5 <10** No FP, No S N Ws10805111409\092997M I XLS EMCON 11!7197