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ALL. <br /> HORIZON ENVIRONMENTAL INC. <br /> Specialists in Site Assessment,Remedial Testing,Design and Operation <br /> WORK PLAN FOR AN <br /> ADDITIONAL SUBSURFACE INVESTIGATION <br /> at <br /> Former Beacon Station No. 12474 <br /> 3440 East Main Street <br /> Stockton, California <br /> INTRODUCTION <br /> i <br /> At the request of Ultramar Inc. (Ultramar), Horizon Environmental Inc. (Horizon) has <br /> prepared this work plan. for performing an additional subsurface 'investigation at Beacon <br /> Station No. 12474 in Stockton, California. This work plan was requested by the San Joaquin <br /> Environmental Health Department (SJEHD) in their letter of July 12;,2005 (Appendix A). <br /> The purpose of this investigation is to further characterize the extent of petroleum <br /> hydrocarbons in soil and groundwater. The investigation proposes the installation of <br /> monitoring wells to characterize water table and intermediate aquifer intervals in the central <br /> portion of the site, and to characterize the intermediate aquifer interval in the southeastern <br /> and southwestern corners of the site. Results of this investigation will be presented in the <br /> context of an updated site conceptual model (SCM). Additionally, the SCM will be revised <br /> with the addition of 1,2-dichloroethane (DCA), isoconcentration maps and notations of the <br /> estimated distribution of analytes of concern in groundwater on the generalized geologic <br /> cross sections. The scope of work described in this work plan is intended to comply with <br /> the Regional Water Quality Control Board-Central Valley Region document Tri-Regional <br /> Board Staff Recommendations for Preliminary Investigation and Evaluation of <br /> Underground Tack Sites, and SJEHD guidelines. <br /> 4970 Windplay Drive,#C5 • EI Dorado Hills,CA 95762 • (916)939-2170 • FAX(916)939-2172 <br /> P.O.Box 5283 • Bakersfield,CA 93388 (661)589-8389 - FAX(661)589-1456 <br />