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4.0 ASSESSMENT OF EXISTING DATA <br />4.1 Data Inventory <br />Data collected prior to and subsequent to the suspected leak have been <br />compiled, reviewed and analyzed. The list of documentation is as follows: <br />Waste Discharge Requirements (RWQCB), July 23, 1.976 for the site <br />Revised Monitoring and Reporting Program, December 29, 1982 <br />Clean-Up and Abatement Order, October 11, 1984 <br />Groundwater Contour Data, Alvin L. Franks, June 3, 1985 <br />Monitoring Program, Alvin L. Franks, August 1985.. <br />Report "Groundwater Quality and Soil Analysis for Closure of _ <br />Arcady Oil Company Disposal Site, Holt, California". Alvin L. <br />Franks, September 2, 1985 <br />RWQCB Memorandum on Alvin L. Franks report, December 12, 1985 <br />Letter from RWQCB (Vorster) to Arcady (Diepenbrock) containing <br />comments on Alvin L. Franks investigation of groundwater and <br />soils, December 12, 1985 <br />RWQCB Inspection Report, February 13, 1986 <br />Since detection of the leak further data have been collected. These <br />data include: <br />Chemical analyses of surface water samples collected from Whiskey <br />and Trapper Sloughs <br />Chemical analyses of groundwater samples collected from existing <br />wells at the site and on nearby properties <br />Chemical analyses of soil samples collected on site and along the <br />banks of adjacent sloughs <br />Chemical analyses of air collected at the landfill and offsite <br />locations <br />The MARK Group's assessment of the existing data, which follows, has <br />been organized under the categories of soils, groundwater, surface water <br />and air. Supporting laboratory analytical results are presented in <br />Appendix D. <br />4-1 <br />inn