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r r �■■i r■� rr �I Ir r r �■r r � r r � �r � r �■ Table 1 Groundwater Monitoring Data and Analytical Results Former Unocal Service Station No. 0187 437 East Miner Avenue Stockton, California Product WELL IDI DATE DTW S.I. GWE Thickness TPHg B T E X MTBE TQC"(/L) (A) (ft.6gs) (msl) (ft.) (ug/L) (u /L} (ug/L) (ug/L) (ug/L) (ug/L) 10.79 05/07/99 24.73 -13.94 0.00 18,000 2,600 240 340 1,900 -- U-3 08/20/99 25.17 -14.38 0.00 18,00010 2,400 300 1,200 1,700 -- (cont) 11123-24/99 26.12 -15.33 0.00 8,96010 609 60.6 566 744 <2501<10.04 02/22-23/00 25.40 -14.61 0-00 43,00010 7,200 5,100 2,200 8,300 <250/<2.04 05/30-31/00 24.03 -13.24 0.00 12,90010 814 95.5 783 1,350 <500/<10.04 08/31-09/01/00 24.74 -13.95 0.00 12,30010 393 65.6 1,440 1,600 <5001<20.04 11.41 11/20-22100 25.37 -13.96 0.00 12,30010 515 65.0 1,460 1,290 <250/<20.04 02126-27/01 24.94 -13.53 0.00 279 0.750 0.657 <0.500 7.93 <2.50/<2.04 05114-16101 24.93 -13.52 0.00 <50.0 <0.500 <0.500 <0.500 <0.500 <5.00/<2.004 08113-15/01 25.63 -14.22 0.00 <50 <0.50 0.72 <0.50 <0.50 <5.0/<2.04 11126-28/01 26.78 -15.37 0.00 1,60010 17 7.6 33 44 <25/3.14 02/25-27/02 26.09 -14.68 0.00 9211 <0.50 0.55 2.4 2.8 <5.0/<1.04 05/07-09102 26.10 -14.69 0.00 11010 1.4 1.6 2.7 3.7 <5.0/<l.04 08/12-14/02 27.31 -15.90 0.00 <50 <0.50 <0.50 <0.50 <0.50 <2.51<1.04 11105-06102 28.51 -17.10 0.00 220 2.1 <0.50 2.4 1.9 <2.5/<2.04 02104-06103 28.65 -17.24 0.00 <50 <0.50 <0.50 <0.50 <0.50 <2.0/<2.04 05/27-30/03 28.16 -16.75 0.00 150 1.2 <0.50 <0.50 0.74 <2.01<0.504 08/26-29/03 29.52 -18.11 0.00 350 4.3 2 2.4 2.6 <2.0/<0.504 11/28/03 34.13 -22.72 0.00 760 9.5 3.9 11 7.5 <0.504 02116-18/04 29.44 -18.03 0.00 19,000 3,400 360 710 3,100 <0.504 04/19/04 28.84 -17.43 0.00 2,500 340 30 120 210 <1.04 08/16/04 30.27 -18.86 0.00 5,600 28 1,200 62 210 840 <0.504 11/15/04 30.63 -19.22 0.00 2,60021 620 30 100 430 <0.504 02/14105 29.58 , -18.17 0.00 440i1 64 2.2 15 90 : <1.0 4 U-4 11.71 08/09/95 42.03 -30.32 0.00 -- -- -- -- -- -- 11/08/95 41.72 -30.01 0.00 440 49 1.2 0.66 230 -- 06940-325 5 of 39 ENSR Corporation a: