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In addition, a second VLEACH model was run to evaluate the potential leaching impact of soil with the <br /> TPH-d concentration in the top three feet of soil column at 2,200 mg/kg (the proposed TPH-d clean up <br /> goal). The VLEACH model results indicate that the TPH-d concentrations in groundwater would be less <br /> than 41 pg/L. <br /> Both VLEACH model simulations demonstrate that soil TPH-d concentrations are incapable of leaching to <br /> groundwater at levels that exceed beneficial use protective concentration. <br /> References <br /> ARCADIS U.S., Inc. (ARCADIS). 2008. Pre-Excavation Soil Investigation Results for OU-3 and OU-4, <br /> Former Tracy Railyard, Tracy, California. May 2. <br /> . 2010. 2009/2010 Annual Monitoring Report, Union Pacific Railroad Company, Former <br /> Maintenance Facility, Tracy California. April 27. <br /> Varadhan Ravi and Jeffrey A. Johnson. Dynamac Corporation. 1997. VLEACH Version 2.2, A One- <br /> Dimensional Finite Difference Vadose Zone Leaching Model. <br />