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Table 1 Groundwater Elevation and Analytical Data(CHEVRON) Chevron Service Station#9-4275 2905 West Benjamin Holt Drive Stockton,California Well Groundwater Depth Ethyl- Total Well Date Elevation Elevation to Water TPH9 Benzene Toluene benzene Xylenes MtBE ID Sampled Notes (K,k?SQ A MSL) (17.TOO ("9R) (u9/1) (u9/1) (u9/1) (u9/1) (ug/1) MW-2 12/17102 -8.18 11.59 140. <0.5 <0.5 3. 5. 11. (cont.) 03118103 -7.15 10.56 1,700 2 <0.5 6 11 110 06117103 -7.48 10.89 1,300 2 -0.5 7 10 74 09124!03 -9.22 12.63 120 0.6 <0.5 2 2 6 12118!03 -8.82 12.23 510 2 <0.5 17 29 11 03123104 -6.64 10.05 2100 6 <0.5 6 10 150 06122/04 -8.57 11.98 1,300 4 <0.5 4 5 150 09/21104 -9.66 13,07 1,500 2 -0.5 20 28 38 12/28104 -8.48 11.89 220 <0.5 <0.5 <0.5 <0.5 39 03107105 -5.60 9.01 2,100 3 <0.5 13 5 300 MW-3 03122!89 2.40 -14.11 16.51 NO NO NO ND NO -- 06112169 -14.79 17.19 NO ND NO ND ND -- 09l07189 -16.24 18.64 ND NO NO ND ND -- 12l18189 -15.38 17.78 ND ND ND ND ND -- 03l20l90 -15.15 17.55 ND NO ND NO NO -- 07l03190 -16.31 18.71 ND NO ND NO NO -- 10/19/90 -17.23 19.63 ND ND NO NO NO - 01/17/91 -16.94 19.34 70 ND NO NO NO - 03/19/91 -- -- NO ND ND NO NO -- 07l18191 -17.08 19.48 ND ND ND NO ND -- 10131l91 -17.46 19.86 NO ND ND NO ND - a1116l92 -16.65 19.05 NO NO ND NO 0.9 -- 03111/92 -15.55 17.95 - -- -- -- -- •• 03117/92 -15.50 17.90 ND 0.7 1.1 NO 0.8 -- 06129l92 -17.05 19.45 ND 0.9 ND ND NO -- 12110/92 -17.67 20.07 ND ND NO NO 0.5 -- 02104!93 -15.61 18.01 NO NO NO NO NO -- 0511W93 -13.74 16.14 NO NO 0.8 0.7 3.7 08105/93 -14.60 17.00 120 0.5 2.2 ND 3.0 11109193 -15.18 17.58 NO ND NO ND NO -- 01/18194 -14.80 17.20 NO ND NO NO NO -- 06127194 -14.10 16.50 ND ND NO NO NO -- 09129194 -15.30 17.70 ND ND NO NO NO -- 12108194 -14.84 17.24 <50 <0.5 <0.5 <0.5 <0.5 -- 03108195 -12.72 15.12 -50 <0.5 <0.5 -0.5 <0.5 -- 08/01195 -11.12 13.52 <50 <0.5 <0.5 <0.5 <0.5 - 09111195 -13.01 15.41 -50 <0.5 -0.5 <0.5 -0.5 12!05195 -13.45 15.85 <50 <0.5 <0.5 <0.5 <0.5 - 03118196 -10.46 12.86 150 0.7 <0.5 -0.5 <0.5 - 06!18196 -9.53 11.93 <50 <0.5 <0.5 -0.5 <0.5 28 09124196 -11.33 13.73 70 <0.5 <0.5 1.1 0.8 <5.0 12104196 INACCESSIBLE -- -- -- •- -- - 02/25197 -6.68 9.08 70 1.0 0.6 0.5 2.0 20 05/06197 -7.73 10.13 <50 <0.5 <0.5 -0.5 <0.5 25 09/29197 -10.48 12.88 <50 <0.5 <0.5 <0.5 <0.5 21 11125197 -10.44 12.84 <50 <0.5 <0.5 <0.5 <0.5 9.5 03!26198 -3.93 6.33 89 1.6 <0.5 <0.5 <0.5 91 06/24196 -5.85 8.25 <50 -0.5 -0.5 -0.5 <0.5 36 09110198 -7.80 10.20 <50 0.75 0.53 <0.5 1.4 11 12!17198 -7.79 10.19 <50 <0.5 <0.5 <0.5 <0.5 55 03/10/99 -5.83 8.23 <50 <0.5 <0.5 <0.5 <0.5 37 06/22/99 -7.51 9.91 <50 <0.5 <0.5 <0.5 <0.5 8.76 09113/99 -9.10 11.50 <50 <0.5 -0.5 -0.5 -0.5 26 12116199 -9.03 11.43 <50 <0.5 <0.5 -0.5 <0.5 43.5 03101/00 .4.91 7.31 58 <0.5 <0.5 -0.5 <0.5 48.5 06113/00 -6.41 8.81 <50.0 -0.500 <0.500 <0.500 -0.500 13.6 09113/00 -8.41 10.81 <50.0 -0.500 0.582 -0.500 -0.500 -5.00 12!14!00 -8.03 10.43 <50.0 <0.500 <0.500 <0.500 <1.50 8.90 03!02!01 (S) -6.44 8.84 <50 <0.50 -0.50 <0.50 -0.50 42014309 031021019 (K) -6.44 8.84 <100 <1.0 <1.0 -1.0 <1.0 400 05110101 -5.98 8.38 <50 -0.50 0.55 -0.50 <0.50 220 08121!01 -8.77 11.17 <50 -0.50 <0.50 -0.50 <0.50 15 12105101 -8.39 10.79 <50 -0.5 <0.5 <0.5 <0.5 27 03111102 -6.10 8.50 <50 <0.5 <0.5 0.6 <0.5 1,800 9 LlChevronl94275V eriodic MonitadnglQ M R%94275_QMR.xls 3 of 11 {