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rr r r r r rr �Ir rr r r r rr rr r� r r �r r 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 B T E X MTBE TOC-ffil) (A) (fi.6gs) OMI) (ft) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) U-23 08/16/04 33.70 -21.32 0.00 59 28 2.1 1.3 <0.50 <1.0 <0.504 (Cont.) 11/15/04 33.85 -21.47 0.00 <50 1.3 <0.50 <0.50 <1.0 <0-504 02/14/05 32.97 -20.59 0.00 54 28, 2.5 1.7 • <0.50 <1.0 <1.04 U-24 12.06 11120-22100 26.50 65-75 -14.44 0.00 <50.0 <0.500 <0.500 <0.500 <0.500 <5.00/<2.004 02126-27101 26.18 -14.12 0.00 <50.0 0.565 <0.500 <0.500 <0.500 <Z50/<2.04 05114-16101 26.04 -13.98 0.00 <50.0 <0.500 0.569 <0.500 <0.500 <5.00/<2.004 08113-15101 27.06 -15.00 0.00 <50 <0.50 0.70 <0.50 0.72 <5.0/<2.04 11126-28101 27.82 -15.76 0.00 <50 <0.50 <0.50 <0.50 <0.50 <5.01<l.04 02/25-27102 27.19 -15.13 0.00 <50 <0.50 <0.50 <0.50 <0.50 <5.0/1.24 05/07-09102 27.40 -15.34 0.00 <50 <0.50 <0.50 <0.50 <0.50 <5.0/<1.04 08112-14102 29.16 -17.10 0.00 <50 <0.50 0.93 <0.50 1.3 <2.5/<1.04 11105-06102 29.99 -17.93 0.00 71 11 2.4 <0.50 10 <2.5/<2.04 02104-06103 29.20 -17.14 0.00 <50 <0.50 <0.50 <0.50 <0.50 <2.0/<2.04 05/27-30103 29.41 -17.35 0.00 130 16 5.8 2.6 22 <2.0/<0.504 08126-29103 30.74 -18.68 0.00 <50 <0.50 <0.50 <0.50 <0.50 <2.0/<0.504 11/26/03 41.18 -29.12 0.00 100 15 4.7 1.8 17 <0.504 02116-18104 42.18 -30.12 0.00 60 5.4 2.1 0.88 7.5 <0.504 04/19/04 35.41 -23.35 0.00 130 7.3 4.5 3.5 32 <0.504 08/16/04 31.68 -19.62 0.00 53 28 2.5 1.4 0.85 6.2 <0.504 11/15/04 36.22 -24.16 0.00 52 2B 3.8 1.9 1.2 7.0 <0.504 02/14/05 41.98 -29.92 0.00 76 w 4.0 2.2 1.6 7.6 <1.04 U-25 - 11.92 11120-22100 24.68 110-120 -12.76 0.00 <50.0 <0.500 5.31 0.958 5.88 <5.00/<2.004 02126-27/01 26.30 -14.38 0.00 <50.0 0.698 <0.500 <0.500 <0.500 <Z50/<2.04 06940-325 25 of 39 ENSR Corporation