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PACIFIC • • <br /> ENVIRONMENTAL ;i1L HEALTH <br /> GROUP INC. <br /> S?� at!G I0 PM 1: 06 <br /> August 8, 1994 <br /> Project 310-001.113 <br /> Mr. John Werfal <br /> Unocal Corporation <br /> 2000 Crow Canyon Place, Suite 400 <br /> San Ramon, California 94583 <br /> Re: Unocal Bulk Plant 0788 <br /> 8203 East 11th Street <br /> Tracy, California <br /> Dear Mr. Werfal: <br /> This work plan, has been prepared by Pacific Environmental Group, Inc. <br /> (PACIFIC) to describe work to be performed at the Unocal Corporation(Unocal) <br /> site referenced above. Unocal is currently considering two alternatives for site <br /> remediation: (1) soil vapor extraction (SVE), and (2) soil excavation with on-site <br /> ex-situ bioremediation (landfarming). <br /> The purpose of this proposed investigation is to further characterize'and delineate <br /> the lateral extent of petroleum hydrocarbon impact to soils underlying the site so <br /> that the most effective site remedial strategy can be implemented. The subsurface <br /> investigation will be accomplished using exploratory test pits for soil and <br /> groundwater sampling. <br /> BACKGROUND <br /> SVE was previously recommended for the site in a remedial action plan (RAP) <br /> prepared by PACIFIC, dated March 18, 1993. Because the site was an operating <br /> bulk plant, only in-situ technologies were considered in the RAP. However, bulk <br /> plant operations ended in December 1993, and it is PACIFIC's understanding that <br /> all aboveground storage tanks and loading racks will be removed from the site in <br /> August 1994. Because of these changed site conditions, ex-situ remedial <br /> technologies are now considered a.viable option for site remediation. <br /> 2025:Gateway Place, Suite 440,San lose,California 95110 (408)441-7500 FAX(408)441-7539 <br />