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TABLE 4 <br /> GROUNDWATER ELEVATION AND ANALYTICAL SUMMARY <br /> Parkinson's Hammer 1-5 Arco <br /> 3250 West Hammer Lane, Stockton, California <br /> Well Groundwater Ethyl- Total <br /> Well Date Elevation Depth to Water Elevation. G110141 Benzene Toluene benzene Xylenes MTBE <br /> Number Collected (ft msl) (feet) (ft msl) (µg/L) (µg/L) (µg/L) (µg/L) (µg/L) (µg/L) <br /> MW-2 09/21/00 4.74 13.23 -8.49 52.9 <0.5 <0.5 <0.5 <0.5 5,830 <br /> 01/19/01 13.23 -8.49 <500 <5.0 <5.0 <5.0 <5.0 21,600 <br /> 04/23/01 12.27 -7.53 <500 <5.0 <5.0 <5.0 <5.0 10,400 <br /> 07/27/01 13.45 -8.71 190 <0.5 2.0 4.1 29 4,800 <br /> 11/01/01 14.45 -9.71 <50 <0.5 <0.5 <0.5 1.8 3,100 <br /> 01/28/02 12.93 -8.19 <50 <0.5 <0.5 <0.5 <0.5 3,300 <br /> 04/23/02 13.02 -8.28 <50 <0.3 <0.3 <0.3 <0.6 3,700 <br /> [1] 07/29/02 5.65 14.02 -8.37 <50 <0.3 <0.3 <0.3 <0.6 4,000 <br /> 10/07/02 14.88 -9.23 99[2] <0.30 <0.30 <0.30 <0.60 5,000 <br /> 01/02/03 14.31 -8.66 <50 0.96 <0.30 <0.30 <0.60 4,400 <br /> 04/03/03 14.02 -8.37 <50 3.4 <0.50 <0.50 <1.0 3,600 <br /> 07/21/03 14.69 -9.04 <50 <0.50 <0.50 <0.50 -<1.0 4.200 <br /> 10/13/03 15.42 -9.77 <50 <0.50 <0.50 <0.50 <1.0 4,700 <br /> 01/12/04 14.78 -9.13 <50 <0.50 <0.50 <0.50 <1.0 1,700 <br /> 06/22/04 14.53 -8.88 <50 <0.50 <0.50 <0.50 <1.0 2;000 <br /> 08/12/04 15.04 -9.39 <50 <0.50 <0.50 <0.50 <1.0 2,500 <br /> 10/21/04 15.19 -9.54 <50 <0.50 <0.50 <0.50 <1.0 1,100 <br /> 01/17/05 14.10 -8.45 <50 <0.50 <0.50 <0.50 <1.0 1,500 <br /> 04/18/05 12.78 -7.13 65 <0.50 <0.50 <0.50 <1.0 470 <br /> 07/18/05 13.46 -7.81 <50 <0.50 <0.50 <0.50 <1.0 720 <br /> 10/17/05 14.32 -8.67 <50 <0.50 <0.50 <0.50 <1.0 13200 <br /> 01/16/06 13.13 -7.48 <50 <0.50 <0.50 <0.50 <1.0 690 <br /> 07/19/06 12.12 -6.47 69 <0.50 <0.50 <0.50 <0.50 110 <br /> 11/01/06 13.50 -7.85 320 <0.50 <0.50 <0.50 <0.50 420 <br /> 02/01/07 13.73 -8.08 190 <0.50 <0.50 <0.50 <0.50 280 , <br /> 04/10/07 13.38 -7.73 180 <0.50 <0.50 <0.50 <0.50 280 <br /> 07/23/07 13.95 -8.30 330 <0.50 <0.50 <0.50 <0.50 420 <br /> 10/22/07 14.30 -8.65 320 <0.50 <0.50 <0.50 <0.50 370 <br /> [5] 01/28/08 7.04 13.30 -6.26 110 <0.50 <0.50 <0.50 <0.50 170 <br /> 04/28/08 13.18 -6.14 130 <0.50 <0.50 <0.50 <0.50 240 <br /> 07/28/08 14.26 -7.22 190 <0.50 <0.50 <0.50 <0.50 370 <br /> August 2008 Workplan---Table 4,Table 5.xls Page 2 of 6 STRATUS <br />