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Section 1 Introduction This report is a Problem Assessment Report(PAR) and Final Remediation Plan (FRP) for the former underground storage tank (UST) location, known as the Disco site, located at 110 North Filbert Street in Stockton, California. This report was prepared according to the guidelines of the Tri-Regional.Board Staff Recommendations for Preliminary Evaluation and Investigation of Underground Tank Sites, Appendix A - Reports (Central Valley Regional Water Quality Control Board [CVRWQCB], 1991). ` The Disco site is the location of three former 10,000-gallon gasoline tanks that released gasoline constituents into the soil and groundwater. The current property owner of the Disco site is Del Monte Foods (Del Monte). Del Monte has conducted soil and groundwater 1 investigation and remediation activities at the Disco site at the direction of San Joaquin County's Public Health Services,Environmental Health Division(PHS/EHD). Purpose and Objectives The purpose of this report is to describe the nature and extent of the gasoline constituents in the subsurface, summarize the hydrogeological conditions that govern contaminant fate and transport, and recommend a remediation plan to manage the risks associated with gasoline constituents present in soil and groundwater. The primary objectives of the report are-(1) to summarize the findings of the Remedial Investigation/Feasibility Study (RI/FS) conducted by CH2M HILL in February of 1992 and the findings of supplemental site characterization and monitoring performed through March 1995, (2) to delineate the extent of the gasoline constituents in the subsurface and estimate the rate of migration, (3) to present progress made with interim remediation, and (4) to recommend a final remediation plan. i Background j The Disco site is located near the intersection of Myrtle Street and Filbert Street in Stockton, California (Figure 1-1). The Disco property and tanks are associated with a former gasoline station that was owned by Parmaceast from the mid-1960s to 1976. Del Monte purchased the Disco property from Parmaceast on April 1, 1976; however, Del Monte never operated or utilized the Disco tanks. j As directed by PHS/EHD in 1985, Del Monte removed the Disco tanks and discovered that a release of gasoline had occurred from the Disco tanks. At the time of removal, the Disco tanks contained water. Soil beneath the tanks was analyzed and found to contain gasoline constituents. Soil containing the gasoline constituents was aerated on-site to reduce levels to below 1,000 mg/kg of volatile hydrocarbons. After soil aeration was completed, the aerated j sF010030980.Doc 1-1 a