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HORIZON ENVIRONMENTAL INC. <br /> Specialists in Site Assessment,Remedial Testing,Design and Operation <br /> PROBLEM ASSESSMENT REPORT <br /> at <br /> Former Discovery Chevrolet <br /> 1615 West I 1 th Street <br /> Tracy, California <br /> 1.0 INTRODUCTION <br /> At the request of Ms. Michelle Nokes, Horizon Environmental Inc. (Horizon)has conducted <br /> an additional subsurface investigation at the former Discovery Chevrolet site located at 1615 <br /> West 11th Street in Tracy, California (Figure 1). The purpose of this work was to further <br /> delineate the lateral and vertical extent of gasoline-impacted soil and groundwater around <br /> the backfilled former underground storage tank (UST) cavity and former dispenser areas as <br /> requested in the San Joaquin County Public Health Services, Environmental Health Division <br /> (SJC PHS/EHD) letter of September 2, 1997. A copy of the SJC PHS/EHD letter is <br /> included in Appendix A. <br /> 1.1 Scope of Work <br /> The scope of work performed during this investigation included obtaining the necessary <br /> permits from the SJC PHS/EHD, preparing a site-specific health and safety plan, collecting <br /> soil and groundwater laboratory samples utilizing Geoprobe direct push technology, <br /> analyzing selected soil and groundwater samples, and preparing this Problem Assessment <br /> Report which presents the field procedures, results, and conclusions of this investigation and <br /> data summarized from previous investigations. <br /> 5011 Golden Foothill Parkway,Suite 7 • EI Dorado Hills,CA 95762 • (916)939-2170 . FAX(916)939-2172 <br /> PO,Box 5283 • Bakersfield,CA 93388 • (805)589-8389 • FAX(805)589-1456 <br />