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Table 1 Groundwater Monitoring Data and Analytical Results Former Unocal Service Station #0187 437 East Miner Avenue Stockton, California Product WELL IDI DATE DTW S.I. GWE Thickness TPH-G B T E X MTBE TOC-(f.) 00 (ft bgs) (msf) (A) (Ppb) (ppb) (Ppb) (ppb) (Ppb) (Ppb) U-3 11126-28101 26.78 -15.37 0.00 1,60010 17 7.6 33 44 <25/3,14 (cont) 02125-27102 26.09 -14.68 0.00 9211 <0.50 0.55 2.4 2.8 <5.0/<1.04 05107-09102 26.10 -14.69 0.00 11010 1.4 1.6 2.7 3.7 <5.01<1.04 08112-14102 27.31 -15.90 0.00 <50 <0.50 <0.50 <0.50 <0.50 <2.51<l.04 11105-06102 28.51 -17.10 0.00 220 2.1 <0.50 2.4 1.9 <2.5/<2.04 02/04-06103 28.65 -17.24 0.00 <50 <0.50 <0.50 <0.50 <0.50 <2.0/<2.04 05127-30/03 28.16 -16.75 0.00 150 1.2 <0.50 <0.50 0.74 <2.01<0.504 08126-29/03 29.52 -18.11 0.00 350 4.3 2.0 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 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 -- 02/06/96 40.29 -28.58 0.00 340 <2.0 <2.0 <2.0 7.2 -- 05/07/96 37.25 -- -25.54 0.00 320 62 2.0 1.4 1.8 -- 08/06/96 36.94 -25.23 0.00 330 110 0.68 13 2.0 -- 11/05/96 36.81 -25.10 0.00 190 3.9 <0.5 <0.5 <0.5 -- 02/03/97 33.40 -21.69 0.00 2601 1.9 <0.5 <0.5 1.6 8.5 05101/97 32.21 -20.50 0.00 77 <0.5 0.89 <0.5 2.3 <5.0 08/04/97 32.43 -20.72 0.00 <50 <0.5 <0.5 <0.5 <0.5 <5.0 11/03/97 33.44 -21.73 0.00 602 <0.5 <0.5 <0.5 <0.5 <5.0 02/13/98 31.03 -19.32 0.00 955 1.3 4.3 0.60 3.8 13 03/09/98 29.98 -18.27 0.00 <50 <0.50 <0.50 <0.50 <0.50 <2.512.84 05/26/98 27.63 -15.92 0.00 96 <0.50 1.3 <0.50 0.68 3.7 08/17/98 26.64 -14.93 0.00 <50 <0.50 <0.50 <0.50 <0.50 3.4 11/10/98 26.74 -15.03 0.00 <50 <0.50 <0.50 <0.50 <0.50 <2.5 - 02/05/99 26.27 -14.56 0.00 <50 0.88 <0.50 <0.50 1.1 -- 11.05 05/07/99 25.03 -13.98 0.00 <50 <0.50 <0.50 <0.50 <0.50 -- 06940-325 5 ENSR Corporation