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Quarterly Summary Report <br /> Fourth Quarter 1993 <br /> 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 <br /> requested additional investigation on January 30, 1990. Pacific Environmental <br /> Group, Inc. (PACIFIC) installed groundwater Monitoring Wells U-1 through U-3 <br /> on October 24 and 25, 1990. Wells U-4 through U-6 and exploratory soil <br /> Borings U-A through U-C were installed in May 1991. On-site Wells U-7 and U-8 <br /> and off-site Wells U-9 and U-10 were installed in March 1992, as described in <br /> PACIFIC's Soil and Groundwater Investigation Report, dated June 11, 1992. A <br /> Remedial Action Plan (RAP) was submitted on March 18, 1993. A work plan for <br /> implementation of the RAP was submitted on July 13, 1993. System design was <br /> completed June 18, 1993. Air emissions permit application was approved by the <br /> San Joaquin Air Pollution Control District in July 1993. <br /> RECENT QUARTER ACTIVITIES <br /> Quarterly groundwater monitoring and sampling were performed by MPDS <br /> Services on November 30, 1993. <br /> NEXT QUARTER ACTIVITIES <br /> Quarterly groundwater monitoring and sampling will be performed by MPDS <br /> Services. A report documenting the November 1993 quarterly groundwater moni- <br /> toring and sampling event will be submitted. The implementation of the remedial <br /> system is on hold. The schedule outlined in the March 18, 1993 RAP will be modi- <br /> fied to reflect the pending demolition of the bulk terminal facility. <br /> CHARACTERIZATION/REMEDIAL STATUS <br /> Soil contamination delineated? Yes. <br /> Dissolved groundwater delineated? No. <br /> Free product delineated? Not applicable. <br /> Amount of groundwater contaminant recovered this quarter? None. <br /> Soil remediation in progress? No. <br /> Anticipated start? Soil vapor extraction system start-up October 8 1993 <br /> Anticipated completion date? Unknown. <br /> Dissolved/free product remediation in progress? No. <br /> Anticipated start? Unknown. <br /> Anticipated completion? Unknown. <br /> CONSULTANT: Pacific Environmental Group, Inc. <br /> 3100103/4Q930SR 1 January 14, 1994 <br />