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PACIFIC <br /> ENVIRONMENTAL <br /> GROUP INC. <br /> December 1, 1994 <br /> Project 310-001.IB <br /> Ms. Penny Silzer <br /> Unocal Corporation <br /> 2000 Crow Canyon Place, Suite 400 <br /> San Ramon, California 94583 <br /> Re: Former Unocal Bulk Plant 0788 <br /> 8203 East 11th Street <br /> Tracy, California <br /> Dear Ms. Silzer: <br /> This report documents the results of an additional soil investigation performed by Pacific <br /> Environmental Group, Inc. (PACIFIC), at the above referenced site(Figures 1 and 2). <br /> iThe investigation was performed in accordance with a PACIFIC Work Plan, dated <br /> August 8, 1994. The work plan was approved by Ms. Mary Meays of the San Joaquin <br /> County Public Health Services Department-Environmental Health Division(S)HSD) <br /> during a telephone conversation with PACIFIC on August 16, 1994. <br /> The purpose of the investigation was to further characterize and delineate the lateral <br /> extent of petroleum hydrocarbon impact to soils underlying the site so that the most <br /> effective site remedial strategy may be implemented. The subsurface investigation was <br /> accomplished using exploratory test pits for soil and groundwater sampling. Unocal <br /> Corporation (Unocal) is currently considering two alternatives for site remediation: <br /> (1) soil vapor extraction(SVE), and (2) soil excavation with on-site ex-situ <br /> bioremediation,(landfarming). <br /> BACKGROUND <br /> SVE was previously recommended for the site in a remedial action plan(RAP) prepared <br /> by PACIFIC, dated March 18, 1993. Because.the site was an operating bulk plant, only <br /> in-situ technologies-were 'considered in the RAP. However, bulk plant operations ended <br /> in December 1993,.and all aboveground storage tanks and loading racks were removed <br /> from the site in September 1994. Because of these changed site conditions, ex-situ <br /> remedial 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 />