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4 <br /> .R <br /> I d <br /> disposal facility would remove the potential source of <br /> groundwater contamination. As discussed in the previous <br /> section, an area with a 15 foot radius and depth of 15 feet, <br /> should define the limits of soil contamination. The <br /> excavation of contaminated material would be limited to the <br /> north due to the proxim ,ty of the property line. On-site <br /> aeration, if possible, would be preferred to disposal <br /> a because of the continued long term liability associated with <br /> disposal of contaminated material at an off site facility. <br /> Confirmation soil sampling should be conducted on the walls <br /> and floor of the excavation to assure all of the <br /> contaminated material is removed. <br /> Based on the presence of contaminated soil near the present <br /> dU groundwater surface an assessment of groundwater conditions <br /> is appropriate beneath former Tank A. This will entail the ' <br /> installation and sampling of at least three monitoring <br /> wells. This work should be undertaken after the soil <br /> remediation activities are completed. <br /> 7.0 REFERENCES <br /> Tr? Regional Guidelines, Revised May 18, 1989, Regional <br /> dater Quality Control Boards <br /> Semi--Annual Groundwater Report, Sprang 1989, San Joaquin <br /> Flood Control and Conservation District <br /> f <br /> f...a <br /> 12 <br /> 6 <br /> E� 1 <br />