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i ATTORNEY-CLIENT PRIVILEGE 1,0 INTRODUCTION This document serves as a closure report for the property located at 1033 East Scott Avenue and 1020 West Hazelton, also known as the Santa Fe Railway Company Site in Stockton, California (the "Site") While a closure report was previously submitted to the San Joaquin County Public Health Service (SJCPHS) in April of 1994, this report contains additional information requested by the Central Valley Regional Water Quality Control Board (CVRWQCB) in their guidance closure document, Appendix B of "The Tri-Regional Board Staff Recommendations for Preliminary Investigation and Evaluation of Underground Storage Tank Sites" In 1987, the Atchison, Topeka and Santa Fe Railway Company acquired the Site in a condemnation proceeding to develop a connection track between two perpendicular railroad tracks Predevelopment activities included the discovery and removal of an underground vault and three underground, steel, single-walled, storage tanks from the Site During the vault/tank removal, petroleum hydrocarbon-impacted soils were found beneath two of the tanks A variety of environmental study activities have since occurred at the Site These include soil sampling and analysis, monitor well installation, quarterly groundwater sampling and analysis, partition-migration studies, and a risk assessment These studies have all been submitted to the San Joaquin County Public Health Service (SJCPHS) and have been the focus of discussions at several meetings The data and analysis of petroleum hydrocarbons support the closure of the Site with the hydrocarbons left in place On August 11, 1993, a meeting was held with staff members from the SJCPHS in Stockton, California The purpose of the meeting was to discuss the results of the risk assessment report, answer any questions, and determine the next course of action At that meeting, technical issues relating to the intermittent reporting of hydrocarbons in groundwater at the Site in the micrograms per liter (µg/L) or parts per billion (ppb) range were discussed - SJCPHS requested a history of the groundwater sampling results and an analysis to determine if the random groundwater detects were Site-related This report presents the analysis to support closure of the Site Included in this report as requested by the CVRWQCB is a summary of the risk assessment, a review of the results of soihand groundwater sampling, an analysis using gas chromatographic results of soil and groundwater laboratory analyses, and partition studies The data presented demonstrate that the chemicals detected in the groundwater below the Site are not Site-related and the Site can be closed with hydrocarbons in place without any significant environmental impact or risk of future impacts t G\D\DFLmoNTE%cLostrRE s%iCV'O Wt7 ao_ 1