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+5106386404 ACC ENVIRONMENTAL 6.55 PO4 JUN 25 199 10:22 <br /> WORK PLAN <br /> Electrical Substation <br /> DDJC Tracy Site <br /> California <br /> 1,0 INTRODUCTION <br /> This Work Plan has been prepared by ACC Environmental Consultants, Inc., (ACC) at the request <br /> of The Stinnett Group, to perform site investigation in regards to the environmental issues for the <br /> site located at the Electrical Substation, DDJC Tracy Site, California (Figure 1). The work <br /> proposed includes drilling four borings and collecting soil samples for the purpose of identifying <br /> sources of impact in the soil in the vicinity of the subject site. <br /> 2.0 BACKGROUND <br /> The existing electrical distribution system consists of 4.16 kV three phase fed from a PG&E-owned <br /> substation through government owned 5 kV oil switches at the north end of the base and 12.47 kV <br /> three phase directly from PG&E-owned overhead distribution lines.The installation wants to cut their <br /> operational costs by owning their own substation and modernize it by converting all of their electrical <br /> distribution systern to 12.47 kV. An Environmental Investigation and Site Characterization Survey <br /> must be done to evaluate the proposed site for potential site contamination and characterize it as a <br /> Category 1,11 or III site. <br /> This work described in this Work Plan is designed to do the following: <br /> • Determine the extent and magnitude of impact to soil; <br /> Characterize soil conditions and document concentrations of constituents of concern;and <br /> • Prepare a Site Characterization Study Report, <br /> 3.0 SCOPE OF WORK <br /> To evaluate the extent of impact in soil, ACC proposes the following scope of work: <br /> • Drill four soil borings, one at each of the four corners of the proposed substation site, to a total <br /> depth of 4 to 5 feet below ground surface(bgs).; <br /> • Collect soil samples from each boring at depths requested by the Army Corps of Engineers to <br /> determine the horizontal and vertical extent of impact; <br /> • Log borings to determine the hydrogeologic conditions at the site; <br /> • Prepare a Site Characterization Study Report. <br />