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■r r rr rr r r■r r r r r r rr rr rr rr rr r� rr rr 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 TOC*((c) OT) (fr;bgs) (-SO (A) (ug/L) (U91L) (u91L) (U91L) (ug/L) (U91L) U-3 05130-31100 24.03 -13.24 0.00 12,90010 814 95.5 783 1,350 <500/<10.04 (cont) 08131-09/01/00 24.74 -13.95 0.00 12,30010 393 65.6 1,440 1,600 <500/<20.04 11.41 11120-22100 25.37 -13.96 0.00 12,30010 515 65.0 1,460 1,290 <2501<20.04 02/26-27/01 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 08113-15101 25.63 -14.22 0.00 <50 <0.50 0.72 <0.50 <0.50 <5.0/<2.04 11126-28101 26.78 -15.37 0.00 1,60010 17 7.6 33 44 <25/3.14 02125-27/02 26.09 -14.68 0.00 92f1 <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 <5.0/<1.04 08112-14102 27.31 -15.90 0.00 <50 <0.50 <0.50 <0.50 <0.50 <2.5/<l.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 <2.0/<0.504 08/26-29103 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 02116-18104 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 5,60028 1,200 62 210 840 <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 05/01/97 32.21 -20.50 0.00 77 <0.5 0.89 <0.5 2.3 <5.0 06940-325 5 of 36 ENSR Corporation