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- <br /> WORK PLAN FOR AN <br /> ADDITIONAL SUBSURFACE INVESTIGATION <br /> AND INTERIM SOIL REMEDIATION <br /> at <br /> Former Beacon Station No. 12474 <br /> 3443 East Main Street <br /> Stockton, California <br /> For Ultramar Inc. <br /> INTRODUCTION <br /> At the request of Ultramar Inc. (Ultramar), Horizon Environmental Inc. (Horizon) has <br /> prepared this work plan for performing a subsurface investigation and initiating interim soil <br /> remediation at Beacon Station No. 12474 in Stockton, California (Figure 1). This work plan <br /> was requested by the San Joaquin Environmental Health Department (SJEHD) in their letter <br /> of June 3, 2002 (Appendix A). <br /> The primary purpose of this investigation is to delineate the vertical and lateral extent of <br /> gasoline-range hydrocarbons in- groundwater. In addition, Horizon proposes to initiate <br /> interim remediation of soil in the vadose zone. Results of this investigation will be used to <br /> evaluate whether future subsurface investigation will be needed and to complete a Problem <br /> Assessment Report (PAR) Corrective Action Plan (CAP). The scope of work described in <br /> this work plan is intended to comply with the Tri Regional Guidelines, and the SJEHD <br /> guidelines. Horizon Environmental Inc. Field Methods and Procedures are included in <br /> Appendix B of this Work Plan. <br />