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1.0 INTRODUCTION As a result of subsurface petroleum hydrocarbon impact beneath former Chevron U S A Service Station 9-1918, in Stockton, California (Figure 1), Chevron U S A Products Company (Chevron) has been engaged in a significant remediation program To further develop the remedial approach, Chevron retained Pacific Environmental Group, Inc (PACIFIC) to prepare this corrective action plan (CAP) The purpose of the plan is to provide a framework for remediation, considering all pertinent regulatory guidance, site conditions, site remediation constraints, and probable future uses of the site 1.1 Previous Investigations Soil and groundwater investigations at the site have been conducted by Blaine Tech Services, Inc (Blaine), EA Engineering, Science, and Technology, Inc (EA), Groundwater Technology, Inc (GTI), Chevron, and Touchstone Developments Investigative work included site demolition activities (including underground storage tank [UST] excavation and removal), installation of 14 groundwater monitoring wells, 1 replacement monitoring well, 6 soil vapor extraction (SVE) wells, and 9 soil bonngs, a water-supply well survey, mstalla- tion and operation of an SVE system, geophysical survey, and fate and transport modeling Blaine is currently conducting quarterly groundwater monitoring at the site Quarterly moni- toring has been performed at the site since November 1988 A brief discussion of the findings of these investigations are presented as Appendix A 1.2 Document Format Within this document, a conceptual site model is developed (Section 2 0), and site water quality, public health, and safety goals are identified (Section 3 0) The need for remedial action is outlined in Section 4 0 In Section 5 0, remedial objectives are identified, remedial technologies are screened and assembled into remedial alternatives, alternatives are evaluated, and a specific alternative is recommended An implementation schedule is proposed and is included herein as Section 6 0 3201337B/CAP AMD DOC 1 November 30, 1995