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L' <br /> Cealo ial rechlics Inc. <br /> . 1101 7b'street <br /> Modesto,Califomia 95354 <br /> (209)522-41191 Fax(209)522-4227 <br /> 1 <br /> Report <br /> Additional Soil Gas Survey <br /> Sinclair Trucking <br /> 3780 West Linne Road. <br /> Tracy, California <br /> Project No. 1030.2 <br /> June 18, 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 <br /> g parking area. Areas of the site not occupied by buildings are covered in' <br /> s compacted base rock material or native soil. <br /> A summary of the Property including details about site description, site location and site <br /> history are included in detail in GTIs: Soil Gas Survey Report dated January 29, 2007.- <br /> Figure <br /> 007.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 /> Tete 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 /> a: <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 min Hg <br /> Henry's law constants are above 0.1 <br /> • In general, the zone between 3 and 10-feet bgs is a silty-sand. <br /> •:: The degree of saturation in the vadose zone is anticipated to be less than 80%'0 <br /> �I <br /> SI <br />