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HORIZON ENVIRONMENTAL INC. <br /> SpecialistM Site Assessment Remedial Testing Design and Operation <br /> L <br /> PRELIMINARY RESULTS OF <br /> ADDITIONAL SUBSURFACE INVESTIGATION <br /> AND WORK PLAN ADDENDUM <br /> at <br /> Beacon Station No 3641 <br /> 1210 East Hammer 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 the Beacon Station No <br /> 3641 in Stockton, California (Figure 1) This report documents performance and results of a <br /> preliminary phase of an additional subsurface investigation for delineation of the lateral and <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 Problem Assessment Report (PAR) and a <br /> Corrective Action Plan (CAP) <br /> The additional investigation at the site was proposed by Horizon in Work Plan for <br /> Additional Groundwater Investigation and Installation of Interim Soil Vapoi Extraction <br /> System dated September 9, 2002 The work plan was approved by the San Joaquin <br /> Environmental Health Department (SJEHD) in a letter dated September 24, 2002 (Appendix <br /> A) This report and work plan addendum is intended to comply with the Regional Water <br /> Quality Control Board Tri Regional Guidelines, and the SJEHD guidelines <br /> 5011 Golden Foothill Parkway Suite 7 . FI Dorado Hills CA 95762 . (916) 939-2170 • FAX (916) 939-2172 <br /> P 0 Box 5283 • Bakersfield CA 93388 (661) 589-8389 • FAX (661) 589-1456 <br />