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HORIZ N ENVIRONMEN AL INC. <br /> Specialists in Site Assessment, Remedial Testing,Design and Operation <br /> `ter <br /> PRELIMINARY RESULTS OF <br /> ADDITIONAL SUBSURFACE INVESTIGATION <br /> AND WORK PLAN ADDENDUM <br /> at <br /> Former Beacon Station No. 12474 <br /> 3440 East Main Street <br /> Stockton, California <br /> INTRODUCTION <br /> At the request of Ultramar Inc. (Ultramar), Horizon Environmental Inc. (Horizon) has <br /> prepared this preliminary results report and work plan addendum for former Beacon Station <br /> • No. 12474 in Stockton, California (Figure 1). This report documents performance and <br /> results of a preliminary phase of an additional subsurface investigation for delineation of the <br /> vertical extent of dissolved hydrocarbons in groundwater at the site. The report also <br /> includes a proposal for additional site groundwater monitoring wells to complete the <br /> delineation of the vertical and deep lateral extent of groundwater impacts. The results of the <br /> total investigation shall be used to prepare a revised Problem Assessment Report (PAR) and <br /> a final Corrective Action Plan(CAP). <br /> The additional investigation at the site was requested and approved by the San Joaquin <br /> Environmental Health Department (SJEHD) in letters dated June 3, 2002 and August 23, <br /> 2002 (Appendix A). This additional investigation and an interim vadose-zone soil remedial <br /> action were proposed by Horizon in Work Plan for an Additional Subsurface Investigation <br /> and Interim Sail Remediation dated July 25, 2002. This report and work plan addendum is <br /> intended to comply with the Regional Water Quality Control Board Tri Regional Guidelines, <br /> • and the SJEHD guidelines. <br /> 5011 Golden Foothill Parkway, Suite 7 • 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 />