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ILA <br /> HORIZON ENVIRONMENTAL INC. <br /> Specialists in Site Assessment Remedial Testing Design and Operation <br /> RESULTS OF <br /> ADDITIONAL SITE INVESTIGATION <br /> at <br /> ZE AUTO REPAIR <br /> 2255 South Airport Way <br /> Stockton California <br /> INTRODUCTION <br /> At the request of Seyfarth Shaw LLP, Horizon Environmental Inc (Horizon) has prepared <br /> this report documenting an additional site investigation at the ZE Auto Repair facility (site) <br /> located in Stockton, San Joaquin County, California A work plan to perform the additional <br /> site investigation was requested by the San Joaquin County Environmental Health <br /> . Department (SJCEHD) in a letter dated October 11, 2002 in response to review of the <br /> Advanced GeoEnvironmental, Inc report Additional Subsurface Investigation Report dated <br /> September 5, 2002 Horizon submitted Work Plan for an Additional Site Investigation dated <br /> April 4 2003, which was approved by the SJCEHD a Ietter dated April 28, 2003 The <br /> SJCEHD correspondence is contained in Appendix A <br /> The SJCEHD requested the additional site investigation to evaluate the vertical and lateral <br /> extent of petroleum-hydrocarbon impacts in soil and groundwater, and to perform a water <br /> well survey within 2000 feet of the site This work plan was developed in accordance with <br /> Appendix A of the Regional Water Quality Control Board document Tri-Regional Board <br /> Staff Recommendations for Preliminary Investtgation and Evaluation of Underground Tank <br /> Sites <br /> i <br /> 5011 Golden Foothill Parkway Suite 7 • EI Dorado bills CA 95762 • (916) 939-2170 • FAX (916) 939-2172 <br /> P 0 Box 5283 . Bakersfield CA 93388 . (661) 589-8389 9 FAX (661) 589-1456 <br />