ARCHIVED REPORTS_DRAFT - PHASE I REMEDIAL INVESTIGATION REPORT

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Kennedy/Jenks Consultants iSection 1: Remedial Investigation Purpose and Background 1.1 Introduction On behalf of the Union Pacific Railroad Company (Union Pacific), Kennedy/Jenks Consultants (Kennedy/Jenks) prepared this DRAFT Phase I Remedial Investigation Report(Report)for Union Pacific's Former Tracy Railyard (Railyard) located in Tracy, California (Figure 1). The remedial investigation (RI) is being conducted under a Voluntary Cleanup Agreement (Agreement) with the California Department of Toxic Substances Control (DTSC), as signed on 23 June 2005. The Agreement specifies that the remedial investigation will be conducted in ' accordance with California Health and Safety Code Section 25300, the National Contingency Plan (40 Code of Federal Regulations Part 300), and the United States Environmental Protection Agency's (EPA's) Interim Guidance for Conducting Remedial Investigations and Feasibility Studies under CERCLA, dated October 1988 (EPA/540-G-89/004). The proposed remedial investigation, whose results are documented in this report, was described in the Remedial Investigation Work Plan Former Tracy Railyard(the RI Work Plan), submitted to DTSC by Kennedy/Jenks on 23 August 2005, the Addendum to Remedial Investigation Work Plan (the Addendum), submitted by Kennedy/Jenks on 27 October 2005, '• and the Response to Comments on Remedial Investigation Work Plan and Addendum (the Response to Comments), submitted by Kennedy/Jenks on 10 November 2005. The RI Work Plan was supplemented by a Sampling and Analysis Plan (SAP); a Quality ' Assurance Project Plan (QAPP); and the Site Health and Safety Plan (HASP). The background information presented in the RI Work Plan and Addendum is also presented in this Report to provide a more complete document. 1.2 Objectives ' The remedial investigation objectives for the Railyard, as set forth in the Agreement, are to: ' • Characterize the extent of hazardous substance impacts at the Railyard • Identify existing and potential migration pathways, including the direction, rate and dispersion of contaminant migration ' • Analyze the baseline risks to help determine the need for remedial action at the Railyard • Determine the levels of chemicals that can remain onsite and still be adequately protective of human health ' • Gather data in order to evaluate feasible remedial alternatives The RI Work Plan presented the design of a preliminary site characterization as part of a ' phased RI. The results of this preliminary site characterization will be used to focus subsequent DRAFT Phase I Remedial Investigation Report Page 1 Former Tracy Railyard, Tracy, California g:Gs-groupladminljob10510565777.18 uprr109-reports\d rpMext.doc