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Quarterly SummaryRepor$ <br /> Fourth Quarter 1995 <br /> Former Unocal Bulk Plant 0788 <br /> 8203 East 11th Street <br /> Tracy, California <br /> City/County ID #: Unknown <br /> County: San Joaquin <br /> BACKGROUND <br /> A partially buried 5,000-gallon transmission fluid storage tank was removed on <br /> December 13, 1989, and analysis of soil samples indicated low levels of petroleum <br /> hydrocarbons. The San Joaquin County Public Health Services Department requested <br /> additional investigation on January 30, 1990. Since 1990, 10 groundwater monitoring <br /> wells have been installed to assess soil and groundwater conditions. A Remedial <br /> Action Plan (RAP) recommending soil vapor extraction and air sparging was submitted <br /> on March 18, 1993. A work plan for implementation of the RAP was submitted on <br /> July 13, 1993. The bulk plant was permanently closed and all related activities ceased <br /> on December 1, 1993. The aboveground tanks, loading racks, and garage structure <br /> were removed from the site in September 1994.' In December 1994, Unocal proposed <br /> a site remedial strategy which included soil vapor extraction and enhanced j <br /> biodegradation. <br /> RECENT QUARTER ACTIVITIES <br /> Semiannual groundwater monitoring and sampling were performed in October 1995. <br /> Petroleum hydrocarbons were not detected in October 1995. Due to continued low-to- <br /> nondetect concentrations of dissolved hydrocarbons in site wells, Pacific Environmental <br /> ,Group, Inc. has recommended Unocal reevaluate remedial-alternatives for the site. <br /> NEXT QUARTER ACTIVITIES <br /> Semiannual groundwater monitoring and sampling will be performed in February 1996.. <br /> A revision to the proposed site remediation strategy will be submitted. <br /> 3100011e14Q95QSR l January 18, 1996 <br /> I <br />