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. 1.0 INTRODUCTION Mrs MMone Conrady is the owner of the property located at 1002 Yosemite Street in Stockton, California The property is the former location of a gasoline service station that was demolished about 1980, when the underground fuel storage tanks were removed Investigation and remediation of contaminated soil and groundwater beneath the site have been supervised by Mr Michael Infiinia of the Environmental Health Division of San Joaquin County Public Health Services (PHS/EHD) since 1993 Neumiller & Beardslee, Attorneys-at-Law,have managed the project for Mrs Conrady since its inception Assessment of the site was completed in 1995 and approved by PHS/EHD in 1996 PHS/EHD then requested Mrs Conrady to remediate the site, and a Corrective Action Plan was approved and implemented in 1998 The remedial work was completed at the end of 1998 In January 1999, on behalf of Mrs Conrady, Neumiller & Beardslee retained Upgradient Environmental Consultants to prepare this Closure Report (No Further Action Required Report) for the site Full and complete rernediation of the site has not been possible,therefore,closure with residual contamination in place is requested This report has been prepared in accordance with Appendix B of the Tri-Regional Board Staff Recommendations for Preliminary Investigation and Evaluation of Underground Tank Sites The first part of the report summarizes the history of the project The bulk of the report deals with the site characterization and the results of the remedial work Appendix A contains the Checklist of Required Data For No Further Action Requests at Underground Tank Sites 2.0 HISTORY OF SITE INVESTIGATION 2.1 Tank Removal The property is located on the northeast corner of Acacia and Yosemite streets in a predominantly residential area of west Stockton (Figure 1) The site is now vacant, but was operated as a gasoline service station from 1961 to 1978 by Mr Jules Conrady In 1980,the station was closed and the fuel storage tanks and dispenser islands were removed These included a 4,000-gallon regular gasoline tank, a 3,000-gallon ethyl gasoline tank, and a 3,000-gallon supreme gasoline tank No information on the condition of the tanks at the time of their removal is available,nor were any soil samples collected at that time 2.2 Site Assessment 2.2.1 Soil Vapor Survey Site assessment activities at the site are summarized in Figure 2 The first step in the investigation was a soil vapor survey conducted by Evax Technologies in 1990 Fifteen vapor probes were advanced to depths of 10, 14, and 19 feet below surface grade, and 33 vapor samples were collected (Figure 3) Each sample was analyzed by FID in an on-site 1