Laserfiche WebLink
PACIFIC • <br /> ENVIRONMENTAL <br /> GROUP INC. <br /> JAN 0 4 1995 <br /> December 30, 1994 <br /> Project 310-001.1B ENVIRONMENTAL HEALTH <br /> PERMIT/SERVICES <br /> Ms. Penny Silzer <br /> Unocal Corporation <br /> 2000 Crow Canyon Place, Suite 400 <br /> San Ramon, California 945.83 <br /> Re: Former Unocal Bulk Plant 0788 <br /> 8203 East 11th Street . <br /> Tracy, California <br /> Dear Ms. Silzer.: <br /> On behalf of Unocal Corporation, (Unocal), Pacific Environmental Group, Inc. (PACIFIC) <br /> has prepared this work plan to describe site remediation activities to be performed at the <br /> referenced site (Figures 1 and 2). Unocal has considered three alternatives for site <br /> remediation: (1) intensive soil vapor extraction(SVE), (2) less intensive SVE, and (3) soil <br /> excavation with on-site ex-situ bioremediation(landfarming). The purpose of this work plan <br /> is to evaluate the three alternatives, select the preferred alternative, develop a proposed scope <br /> of work for the preferred alternative, and present an implementation schedule for the <br /> proposed work. <br /> BACKGROUND <br /> In a remedial action plan (RAP) prepared by PACIFIC, dated March 19, 1993, soil vapor <br /> extraction was selected and developed as the recommended remedial alternative for the <br /> subject site. At that time, the site was an operating bulk plant; therefore, only in-situ <br /> technologies were considered viable and were proposed in the RAP. In December 1993, bulk <br /> plant operations were terminated at the site and in September 1994, all aboveground storage ' <br /> tanks and loading racks were removed from the site. Because of these modified site <br /> conditions, ex-situ remedial technologies formerly discounted could be considered as viable <br /> remedial alternatives. <br /> In order to explore the viability of ex-situ remedial technologies, an investigation was <br /> conducted to further delineate and characterize the lateral extent of petroleum hydrocarbon <br /> impacted soils. The results of this investigation are presented in PACIFIC's Sod Investigation <br /> Report dated December 1, 1994. Additionally, a biofeasibility study was conducted to <br /> determine if any biologically inhibitory conditions exist in the soils that would preclude the use <br /> of bioreclamation at the site. The results of the biofeasibility study identified diverse microbial <br /> 2025 Gateway Place,Suite 440,San lose,California 95110 (408)441-7500 FAX(408)441-7539 <br />