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i 1r � i � i � i � i i r i i r i• � � i Table 1 Groundwater Monitoring Data and Analytical Results Former Unocal Service Station No. 0187 437 East Miner Avenue Stockton, California Product WELL ID/ DATE DTW S.I. GWE Thickness TPHg B T E X MTBE TOC-(ft) (A) (Abgs) (MSI) (ft) (u9/4 (U91L) (ug/L) (u /L) (ugh) (ug/L) U-7 05114-16101 25.14 -13.39 0.00 <50.0 <0.500 <0.500 <0.500 <0.500 <5.00/<2.004 <50 <0.50 <0.50 <0.50 <0.50 <5.0/<2.04 (cont) 08113-15101 25.84 -14.09 0.00 11126-28101 27.06 -15.31 0.00 <50 <0.50 <0.50 <0.50 <0.50 <5.D/<1.04 02/25-27102 26.40 -14.65 0.00 <50 <0.50 <0.50 <0.50 <0.50 <5.0/<1.04 05/07-09102 26.46 -14.71 0.00 <50 <0.50 <0.50 <0.50 <0.50 <5.01<1.04 08112-14102 27.74 -15.99 0.00 <50 <0.50 1.1 <0.50 1.5 <2.5/<1.04 11105-06102 28.68 -16.93 0.00 <50 <0.50 <0.50 <0.50 <0.50 <2.51<2.04 02104-06/03 28.30 -16.55 0.00 <50 <0.50 <0.50 <0.50 <0.50 <2.01<2.04 05127-30103 28.34 -16.59 0.00 <50 13 1.0 <0.50 <0.50 7.0/4.34 08126-29103 29.69 -17.94 0.00 <50 <0.50 <0.50 <0.50 <0.50 <2.0/<0.504 11/28/03 32.00 -20.25 0.00 <50 <0.50 <0.50 <0.50 <1.00 <0.504 02116-18/04 29.52 -17.77 0.00 <50 <0.50 <0.50 <0.50 <1.0 <0.504 04/19/04 28.98 -17.23 0.00 <50 1.4 1.7 2.8 10 <0.504 08/16/04 30.30 -18.55 0.00 <50 <0.50 <0.50 <0.50 1.2 <0.504 11/15/04 30.95 -19.20 0.00 <50 <0.50 <0.50 <0.50 <1.0 <0.504 U-8 11.53 08/09/95 41.85 - -30.32 0.00 -- -- -- -- -- - 11/08/95 41.53 -30.00 0.00 170 <0.5 0.51 0.76 1.2 - 02/06/96 39.78 -28.25 0.00 380 75 2.5 5.3 8.4 -- 05/07/96 37.09 -25.56 0.00 180 6.5 1.2 1.4 1.6 -- 08/06/96 36.98 -25.45 0.00 <50 <0.5 <0.5 <0.5 <0.5 -- 11/05/96 36.65 -25.13 0.00 <50 <0.5 <0.5 <0.5 <0.5 -- 02/03/97 33.04 -21.51 0.00 1101 0.78 <0.5 <0.5 1.1 <5.0 05/01/97 32.21 -20.68 0.00 <50 <0.5 <0.5 <0.5 <0.5 <5.0 08/04/97 32.53 -21.00 0.00 <50 <0.5 <0.5 <0.5 <0.5 <5.0 11/03/97 33.49 -21.96 0.00 <50 <0.5 <0.5 <0.5 <0.5 <5.0 02/13/98 30.67 -19.14 0.00 <50 <0.50 <0.50 <0.50 <0.50 <2.5 06940-325 11 of 38 ENSR Corporation