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man M M -Ir r r w m m r r ■■r m • 0 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-(ft) (jc) (Abgs) (MSO (ft) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) U-4 11/29/03 35.30 -23.58 OA4 <50 <0.50 <0.50 <0.50 <1.00 <0.504 (cont) 02116-18104 29.80 -18.08 0.00 <50 1.8 <0.50 <0.50 <1.0 <0.504 04/19/04 29.14 -17.42 0.00 <50 1.1 1.1 1.4 5.3 <0.504 08/16/04 30.59 -18.87 0.00 <50 1.8 <0.50 0.57 2.7 <0.504 11/15/04 31.20 -19.48 0.00 <50 <0.50 <0.50 <0.50 <1.0 <0.504 U-5 12.58 08/09/95 42.80 -- -30.22 0.00 - -- -- - -- -- 11/08/95 42.49 -29.91 0.00 <50 <0.5 0.53 <0.5 <0.5 -- 02I06196 41.05 -28.47 0.00 <50 <0.5 <0.5 <0.5 <0.5 -- 05/07/96 38.03 -25.45 0.00 <50 <0.5 <0.5 <0.5 <0.5 -- 08/06/96 37.69 -25.11 0.00 <50 <0.5 <0.5 <0.5 <0.5 11/05196 37.53 -24.95 0.00 <50 <0.5 <0.5 <0.5 <0.5 - 02/03/97 34.13 -21.55 0.00 <50 <0.5 <0.5 <0.5 <0.5 <5.0 05/01/97 32.88 -20.30 0.00 <50 <0.5 <0.5 <0.5 <0.5 <5.0 08/04/97 33.09 -20.51 0.00 <50 <0.5 <0.5 <0.5 <0.5 <5.0 11/03/97 34.12 -21.54 0.00 <50 <0.5 <0.5 <0.5 <0.5 <5.0 02/13/98 31.79 -19.21 0.00 <50 <0.50 <0.50 <0.50 <0.50 <2.5 03109!98 30.63 -18.05 0.00 <50 <0.50 <0.50 <0.50 <0.50 <2.5/<2.04 05/26/98 28.19 -15.61 0.00 <50 <0.50 <0.50 <0.50 <0.50 <2.5 08/17/98 27.14 -14.56 0.00 <50 <0.50 <0.50 <0.50 <0.50 <2.5 11/10/98 27.28 -14.70 0.00 <50 <0.50 <0.50 <0.50 <0.50 <2.5 02/05199 26.77 -14.19 0.00 <50 <0.50 1.0 <0.50 1.3 -- <0.50 <0.50 <0.50 11.95 05/07/99 25.57 -13.62 0.00 <50 <0.50 -- 08/20/99 25.82 -13.87 0.00 <50 <0.50 <0.50 <0.50 <0.50 -- 11/23-24199 26.80 -14.85 0.00 <50.0 1.31 8.77 0.936 4.96 8.82/5.084 02122-23100 26.07 -14.12 0.00 <50 <0.50 <0.50 <0.50 <0.50 <2.5/<2.04 05130-31100 24.85 -12.90 0.00 <50.0 <0.500 <0.500 <0.500 <0.500 <5.00/<2.004 06940-325 7 of 38 ENSR Corporation