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TABLE 4 <br /> GROUNDWATER ELEVATION AND ANALYTICAL SUMMARY <br /> Parkinson's Hammer I-5 Arco <br /> 3250 West Hammer Lane, Stockton, California <br /> Well Groundwater Ethyl- Total <br /> Well Date Elevation Depth to Water Elevation GRO[4] Benzene Toluene benzene Xylenes MTBE <br /> Number Collected (ft msl) (feet) (ft msl) (gg/L) (gg/L) (gg/L) (gg/L) (gg/L) (µg/L) <br /> MW-4 07/29/02 4.80 13.28 -8.48 <50 1.1 <0.3 <0.3 <0.6 14,000 <br /> 10/07/02 [1] 14.12 -9.32 <50 <0.30 <0.30 <0.30 <0.60 9,600 <br /> 01/02/03 13.56 -8.76 <50 33 0.73 <0.30 1.1 14,000 <br /> 04/03/03 13.35 -8.55 <50 <0.50 <0.50 <0.50 <1.0 12.000 <br /> 07/21/03 13.93 -9.13 <50 <0.50 <0.50 <0.50 <1.0 14,000 <br /> 10/13/03 14.70 -9.90 <50 <0.50 <0.50 <0.50 <1.0 9,900 <br /> 01/12/04 13.97 -9.17 <50 2.8 <0.50 <0.50 <1.0 5,100 Cl <br /> 06/22/04 13.76 -8.96 410[2] 43 0.92 <0.50 <1.0 790 <br /> 08/12/04 14.27 -9.47 <50 1.2 <0.50 <0.50 <1.0 16 <br /> 10/21/04 14.51 -9.71 <50 1.1 2.4 <0.50 <1.0 15 <br /> 01/17/05 11.42 -8.62 <50 0.6 <0.50 <0.50 <1.0 1,800 <br /> 04/18/05 12.03 -7.23 95 <0.50 <0.50 <0.50 <1.0 930 <br /> 07/18/05 12.70 -7.90 <50 2.6 <0.50 <0.50 <1.0 170 <br /> 10/17/05 13.60 -8.80 <50 <0.50 0.58 <0.50 <1.0 13 <br /> 01/16/06 12.41 -7.61 <50 <0.50 <0.50 <0.50 <1.0 <0.50 <br /> 07/19/06 11.30 -6.50 <50 <0.50 <0.50 <0.50 <050 <0.50 <br /> 11/01/06 12.75 -7.95 . <50 <0.50 <0.50 <0.50 <0.50 <0.50 <br /> 02/01/07 12.94 -8.14 <50 <0.50 <0.50 <0.50 <0.50 2.1 <br /> 04/1.0/07 12.48 -7.68 <50 <0.50 <0.50 <0.50 <0.50 26 <br /> 07/23/07 13.20 -8.40 <200[3] <1.0[3] <1.0[3] <1.0[3] <1.0[3] 1.8 <br /> 10/22/07 13.27 -8.47 <100[3] <0J0 <0.50 <0.50 <0.50 3.3 <br /> [5]] 01./28/08 6.18 12.56 -6.38 <100[3] <0.50 <0.50 <0.50 <0.50. 68 <br /> 04/28/08 12.38 -6.20 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <br /> 07/28/08 13.50 -7.32 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <br /> C <br /> August 2008 Workplan---Table 4,Table 5.xls Page 4 of 6 STRATUS <br />