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ATC Associates Inc Project No 99975 7501 REPORT OF CORRECTIVE ACTIONS AND RECOMMENDATION FOR SITE CLOSURE 151 South Main Street Manteca, California May 25, 2001 1.0 INTRODUCTION The purpose of this report, prepared by ATC Associates Inc on behalf of Value Reclamation Corporation,is to present the most recent groundwater monitoring data,to present data supporting the successful achievement of the remediation program objectives, and finally, based upon the information presented herein, to recommend that the site be considered for closure To address the remediation of soil and groundwater impacted by a leaking underground gasoline storage tank, in July 1997, On-Site Technologies, Inc prepared a Corrective Action Plan (CAP) for the site The report was approved by the San Joaquin County Public Health Service's Environmental Services Division as an Interim Remedial Action Plan pending demonstrated effectiveness of the measures proposed in the Plan A detailed description of the site and the background and history of the site are presented in the July 1997 CAP and in the numerous reports of investigation and groundwater monitoring referenced therein Because the CAP adequately summarizes the relevant results of all previous site investigations and pre-remediation groundwater monitoring events, for easy reference, a copy of the CAP is presented in this report as Appendix A Although this report may contain some redundant information, it is our intent to provide in this single document,all of the relevant information(derived from site characterization and remedial investigations and subsequent groundwater and remediation monitoring)sufficient to support the conclusions and recommendations presented herein 2 0 GROUNDWATER MONITORING Included in this report are the results of the three latest groundwater sampling events conducted on January 21 2000,June 23,2000,and January 23,2001 The results of the later two events are particularly significant because,as a result of site modifications,active remediation at the site was _ suspended on February 21, 2000 and has not resumed The June sampling event was conducted 4 months after the cessation of soil N apor and groundwater extraction at the site, and the January 2001 event was conducted I 1 months after cessation of active remediation The sampling and sample handling procedures used for the three sampling events are presented in Appendix B