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rr rr� �■■� r r r rr r � r r rr r r rw rl � r 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 TPN-G B T E X MTBE TOC-(ft) (ft) (Abgs) (-SO uh) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) U-1 05114-16101 25.11 -13.46 0.00 1,38010 19.1 3.61 2.47 84.6 <20.0/<2.004 (cont) 08113-15/01 25.81 -14.16 0.00 70010 14 2.1 1.7 8.3 18/<2.027 11/26-28/01 26.90 -15.25 0.00 130' <0.50 0.79 <0.50 0.73 <5.0/2.14 02/25-27/02 26.23 -- -14.58 0.00 57011 3.5 0.51 0.59 15 13/<1.04 05/07-09102 26.12 -14.47 0.00 1,00011 23 3.4 5.9 57 <25/<l.04 08/12-14/02 27.46 -15.81 0.00 320 6.3 0.60 <0.50 <0.50 6.1/1.24 11105-06102 28.41 -16.76 0.00 190 2.7 0.59 <0.50 0.85 5.9/<2.04 02/04-06103 28.33 -16.68 0.00 <50 <0.50 <0.50 <0.50 <0.50 <2.0/<2.04 05/27-30/03 28.26 -16.61 0.00 170 2.6 <0.50 <0.50 <0.50 6.1/<0.504 08/26-29/03 29.60 -17.95 0.00 <50 <0.50 <0.50 <0.50 <0.50 <2.0/0.504 11/29/03 34.23 -22.58 0.00 <50 <0.50 <0.50 <0.50 <1.00 <0.504 U-2 11.49 08/19/94 47.71 -- -36.22 0.00 870 150 12 33 87 -- 11/17/94 47.59 -36.10 0.00 360 88 <1.0 3.8 4.5 -- 02/17/95 45.11 -33.62 0.00 120 4.9 <0.5 0.59 1.8 -- 05/09/95 42.50 -31.01 0.00 91 8.3 0.66 1.5 3.3 -- 08/09/95 41.32 -29.83 0.00 63 9.8 <0.5 1.3 2.6 11/08/95 41.11 -29.62 0.00 150 17 0.68 0.32 0.79 -- 02/06/96 39.51 -28.02 0.00 51 3.2 <0.5 <0.5 <0.5 05/07/96 36.77 -25.28 0.00 60 1.8 <0.5 <0.5 <0.5 -- 08/06/96 36.56 -25.07 0.00 57 1.5 0.54 <0.5 <0.5 11/05196 36.19 -24.70 0.00 <50 0.62 <0.5 <0.5 <0.5 -- 02/03/97 32.63 -21.14 0.00 <50 0.52 <0.5 <0.5 <0.5 <5.0 05/01/97 31.81 -20.32 0.00 58 0.89 <0.5 <0.5 <0.5 <5.0 08/04/97 32.10 -20.61 0.00 782 0.88 <0.5 <0.5 <0.5 <5.0 11/03/97 33.02 -21.53 0.00 <50 <0.5 <0.5 <0.5 <0.5 <5.0 02/13/98 30.41 -18.92 0.00 <50 <0.50 <0.50 <0.50 <0.50 <2.5 06940-325 2 ENSR Corporation