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fi F. <br /> wt g,, IT <br /> ec <br /> 1, 1101 7"'Street <br /> Modesto,California 95354 <br /> (209)522-4119/Fax(209)522-4227 <br /> Report <br /> Soil Gas Survey <br /> Sinclair Trucking . <br /> 3780 West Linne Road: <br /> Tracy, California <br /> Project No. 1030.2 <br /> January 29, 2007 <br /> 1.0 INTRODUCTION <br /> The Property is located at 3780 Linne Road in Tracy, California (Figure 1). There are <br /> currently no USTs on the property. The property is a developed lot on approximately-one- <br /> acre surrounded by open fields of row crops. The site has a residence, maintenance & service <br /> buildings and a parking area. Areas of the site not occupied by buildings are covered in <br /> compacted base rock material or native soil. <br /> i <br /> " Approximately 400 cubic yards of contaminated soil was excavated and removed,from the j <br /> Property in February 2005. '•Due to spatial limitations and financial restraints placed on the <br /> project by the .Cleanup Fund; some contaminated soil was left in place. Groundwater <br /> .monitoring activities indicate there is some groundwater contamination at the site. <br /> f y Figure 2 is a site map showing well and boring locations, structures, and the approximate <br /> extent of the excavation. <br /> 1:1 Investigation Objectives <br /> L� The purpose of the proposed soil gas survey is to collect the additional'data ]required to <br /> evaluate the risk of vapor intrusion into the on-site buildings posed by the remaining soil and <br /> groundwater contamination. The following sampling criteria were used in selecting an active <br /> soil gas survey for this site: <br /> • The constituents of concern at the Property are volatile organic compounds (VOCs) <br /> * Vapor pressures are above 0.5 mm Hg _ <br /> Henry's law constants are above 0.1 <br /> ,w <br /> a <br />