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�r rr r rr rr rr r r� � r rr r� rr �r r■ r�•rr 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 8 T E X MtBE TOC-(ft.) Of (fi-bgs) (MSI) 00 (ug/L) (U91L) (u ) (u /L) (ug/L) Ng/LI- U-8 11.53 08/09/95 41.85 -- -30.32 0.00 -- -- -- -- -- 11108/95 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 11/05196 36.66 -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 03/09/98 29.87 -18.34 0.00 100 <0.50 <0.50 <0.50 <0.50 <2.51<2.04 05/26/98 27.47 -15.94 0.00 4,700 13 <100 <100 <100 <500 08/17/98 26.90 -15.37 0.00 76 0.58 <0.50 <0.50 1.3 <2.5 11/10/98 26.96 -15.43 0.00 767 <0.50 <0.50 <0.50 <0.50 <2.5 02/05/99 26.39 -14.86 0.00 73 <0.50 1.5 <0.50 2.0 -- 11.03 05/07/99 25.19 -14.16 0.00 73 0.64 3.7 0.74 4.7 -- 08/20/99 25.63 -14.60 0.00 11010 0.57 1.4 0.55 3.1 -- 11123-24199 26.53 -15.50 0.00 <50.0 <0.500 <0.500 <0.500 <0.500 <5.001<2.004 02122-23100 25.65 -14.62 0.00 <50 <0.50 <0.50 <0.50 <0.50 <2.51<2.04 05130-31100 24.57 -13.54 0.00 <50.0 <0.500 <0.500 <0.500 <0.500 <5.001<2.004 08131-09101100 25.26 -14.23 0.00 <50.0 <0.500 0.651 <0.500 0.533 <5.001<2.004 11.64 11120-22100 25.79 -14.15 0.00 <50.0 <0.500 <0.500 <0.500 <0.500 <5.00/<2.004 02126-27/01 25.56 -13.92 0.00 <50.0 <0.500 <0.500 <0.500 <0.500 <2.501<2.04 _ 05114-16/01 25.39 -13.75 0.00 <50.0 <0.500 <0.500 <0.500 <0.500 <5.001<2.004 08/13-15/01 26.12 -14.48 0.00 <50 <0.50 <0.50 <0.50 <0.50 <5.0/<2.04 06940-325 11 of 35 ENSR Corporation