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' ARCADIS Ms. Kathryn Dominic <br /> November 5, 2010 <br /> ' Copies: <br /> Mr. James E. Diel, Union Pacific Railroad Company, Roseville <br /> Mr. Michael J. Infurna, San Joaquin County Public Health, Stockton <br /> Attachments: <br /> Figure 1 —Site Location Map <br /> Figure 2—Site Layout <br /> (Attachments Included on CD) <br /> ' Attachment 1 —VLEACH Model Summary <br /> Attachment 2—PAHs in Soil <br /> Attachment 3—PAHS in Groundwater <br /> Attachment 4—Metals in Soil <br /> ' Attachment 5—Metals in Groundwater <br /> References: <br /> ' ARCADIS. 2008. Pre-Excavation Soil Investigation Results for OU-3 and OU-4 <br /> Technical Memorandum. May 2. <br /> ' , 2010. Biotreatment Beds Post Remediation Investigation Report, Union <br /> Pacific Railroad Company, Former Tracy Maintenance Facility, 720 East <br /> 6t'Street, Tracy, San Joaquin County. August 24. <br /> ' California Department of Toxic Substances Control (DTSC). 1992. Supplemental <br /> Guidance for Human Health Multimedia Risk Assessment of Hazardous <br /> Waste Sites and Permitted Facilities. California Department of <br /> Environmental Protection, Department of Toxic Substances Control, Office <br /> of Scientific Affairs. July. <br /> 1996. Guidance for Ecological Risk Assessment at Hazardous Waste <br /> Sites and Permitted Facilities, California Department of Environmental <br /> ' Protection, Human and Ecological Risk Division. July. <br /> California Environmental Protection Agency (CaIEPA), Office of Environmental <br /> ' Health Hazard Assessment(OEHHA). 2010. Toxicity Criteria Database. <br /> Office of Environmental Health Hazard Assessment. <br /> http:/ANww.oehha.ca.gov/risk/ChemicalDB/index.asp. <br /> ' California Regional Water Quality Control Board, Central Valley Region (RWQCB). <br /> 2008. Approval of Final Removal Action Work Plan for OU-3 and OU-4, <br /> ' Former Tracy Rail Yard, Tracy, San Joaquin County, California. May 19. <br /> Page' <br /> P WiGpI60WWgxWm6nWn'rn PetlNReiasMQ09.Tery WI FW Ddwo Ml&.11 P'obeTbnl BM Raepmn bRWXB16io lBMe TC 114540idmx 6/7 <br />