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David Wang, P.E. , Chief <br /> Page 2 <br /> Novpmbpr 8. 19QO <br /> In summary, the previous investigations have determined that <br /> five areas require further study. They are: <br /> 1) Former Landfill and Burning Ground. <br /> 2) Battery Acid Disposal Area. <br /> 3) Fire Fighting Area. <br /> 4) General Services Administration (GSA) Damaged Container <br /> Storage Area. <br /> 5) Site 5: Ten smaller sites of potential soil and ground <br /> water contamination. <br /> WORKPLAN PROPOSAL <br /> The Mark Group has been contracted by the Western Division, <br /> Naval Facilities Engineering Command (WESDIV) to implement the <br /> next phase of the Remedial Investigation/Feasibility Study <br /> (RI/FS) . An Interim Investigation Workplan was submitted to <br /> the Department of Health Services (Department) for review in <br /> August 1990. It outlines field work proposed for the <br /> 1990-1991 fiscal year. The Workplan is designed to satisfy <br /> specific hydrological objectives rather than proceed with an <br /> all encompassing investigation. Objectives of the Workplan <br /> are: <br /> o Evaluate the hydraulic continuity between Burns Cut-off <br /> (San Joaquin River channel) and ground water. <br /> o Evaluate off-site migration of chemical constituents. <br /> o Determine the regional ground water flow. <br /> o Assess influences of the storm water drainage system <br /> upon Burns Cut-off and ground water. <br /> o Investigate the interconnection of the upper and <br /> intermediate water-bearing zones. <br /> o Improve the soil stratigraphy database. <br /> Activities planned to meet the objectives include: <br /> o Construction of additional monitoring wells or <br /> piezometers. <br /> seven monitoring wells in the shallow zone <br /> seven monitoring wells in the intermediate zone <br /> three new piezometer clusters <br />