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1 �P� <br /> ARCADIS <br /> �E(, O ARCADIS U.S., Inc. <br /> Infrastructure, environment, facilities 2008140 Second Street,Ste 200 <br /> EIV VIR()Nj.? NEA L Petaluma <br /> PEP.i�l952 <br /> T�-SERVICESjh Tel 707.7 6California 40865 <br /> Ms. Kathryn Dominic Fax 707.776.0850 <br /> Engineering Geologist www.arcadis-us.com <br /> California Regional Water Quality Control Board, Central Valley Region <br /> 11020 Sun Center Drive, Suite 200 <br /> Rancho Cordova, California 95670-6114 <br /> ENVIRONMENT <br /> Subject: <br /> Response to RWQCB Comments on 2007/2008 Annual Monitoring Report, <br /> Union Pacific Railroad Company, Former Tracy Maintenance Facility, <br /> 720 East 6th Street, Tracy, San Joaquin County, California <br /> Date: <br /> November 26, 2008 <br /> Dear Ms. Dominic: <br /> Contact: <br /> ARCADIS has prepared this letter in response to comments from the California Lisa Teague <br /> Regional Water Quality Control Board, Central Valley Region (RWQCB) letter dated Phone: <br /> September 16, 2008. The RWQCB comments addressed the 2007/2008 Annual 707.776.0865 ext 18 <br /> Monitoring Report(Annual Report) for the Former Tracy Maintenance Facility at <br /> 720 East 6th Street, Tracy, California (Site). ARCADIS submitted the Annual Report, Email <br /> which was dated May 16, 2008, on behalf of the Union Pacific Railroad Company Lisa.Teague@arcadis- <br /> us.com <br /> (UPRR). <br /> Our ref: <br /> For convenience, the RWQCB comments, and the corresponding responses, are RC000709.0601.00019 <br /> presented below in the order they appear in the RWQCB letter. <br /> Comment 1 <br /> Section 3.1, Remediation System Operation and Maintenance, refers to a Rebound <br /> and Remediation Effectiveness Evaluation Addendum Work Plan (dated 3 January <br /> 2006) and Additional Product Removal Proposal(dated 28 August 2006) submitted <br /> to the Regional Water Board for review. ARCADIS states that UPRR has not <br /> received comments from the Regional Water Board on these documents. I located <br /> the comment letter from Steven Meeks to Jim Levy dated 20 November 2006 that <br /> addresses both of these documents. In it, the Regional Water Board staff specifies <br /> revisions to the Work Plan, conditionally concurs with the application of low vacuum <br /> soil vapor extraction and free product skimming, and recommends that extraction <br /> wells EW-1 through EW-21 be either abandoned or incorporated into the MRP. I <br /> forwarded this letter electronically to Lisa Teague of ARCADIS on 25 August 2008. <br /> Please review the letter against what has been done or remains to be done from <br /> Imagine the result <br /> G:VWRCADIS_DatatProjects-Active\Union Pacific Railroad\RC709-Tracy VartACortes-Regulatoryt2008-11-26 Response to RWQCB 9-16-08 tr-Resp—e to oumients_11 26 0844 <br />