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HORIZON ENVIRONMENTAL INC. <br /> • Specialists in Site Assessment Remedial Testing Design and Operation <br /> RESULTS OF <br /> ADDITIONAL GROUNDWATER ASSESSMENT <br /> AND <br /> UPDATED SITE CONCEPTUAL MODEL <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 report documenting the results of the additional groundwater investigation and <br /> • the updated site conceptual model for the former Beacon Station No 12474 located in <br /> I <br /> Stockton, California This investigation was originally requested by San Joaquin County <br /> Environmental Health Department (SJCEHD) in letters dated June 3, 2002 and August 23, <br /> 2002 This investigation was proposed by Horizon in the Preliminary Results of Additional <br /> Subsurface Investigation and Work Plan Addendum dated February 26, 2003, Revision to <br /> Work Plan Addendum dated June 16, 2003, and Work Plan Addendum dated December 22, <br /> 2003 The proposed work was approved by SJCEHD in a letter dated January 2, 2004 <br /> (Appendix A) <br /> The report was developed in accordance with the State of California Water Resources <br /> Control Board document Leaking Underground Fuel Tanks (LUFT) Manual and the <br /> Regional Water Quality Control Board document (RWQCB) Tri-Regional Board Staff <br /> Recommendations for Preliminary Investigation and Evaluation of Underground Tank Sites <br /> dated April 16, 2004 All fieldwork was conducted in accordance with Horizon Field <br /> Methods and Procedures (Appendix B) <br /> 4970 WEndplay Drive #C5 • EI Dorado Hills CA 95762 • (916)939-2170 • FAX(916)939-2172 <br /> PO Box 5283 • Bakersfield CA 93388 • (661)589-8389 • FAX(661) 589-1456 <br />