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Environmental <br /> Resources <br /> Illll <br /> E E�� Management^lu{! �V 2525 Natomas Park Drive <br /> AUG V 0 L006 Suite 350 <br /> Sacramento,CA 95833 <br /> ENVIRONMENT HEALTH (916)924-9378 <br /> 28 August 2006 PERNUT/SERVICES (916)920-9378(fax) <br /> Mr. Steven Meeks <br /> Regional Water Quality Control Board, Central Valley Region <br /> 11020 Sun Center Drive, Suite 200 t <br /> Rancho Cordova, CA 95670-6114 ERM <br /> Subject: Additional Product Removal Proposal <br /> Union Pacific Railroad Company <br /> Tracy Maintenance Facility <br /> Tracy, California <br /> Dear Mr. Meeks: <br /> On behalf of Union Pacific Railroad Company (UPRR),ERM-West, Inc. <br /> (ERM)transmits this letter detailing UPRR's proposed approach for <br /> implementing additional product removal actions at the Tracy <br /> Maintenance Facility (Maintenance Facility) in Tracy, California (Figure 1 <br /> and Figure 2). Historically, free-phase product has been observed in the <br /> following wells at the site: MW-6A, MW-11 A, PZ-01, PZ-02, PZ-08, PZ-09, <br /> PZ-10,TW-01, TW-02,TW-03, and TW-04. UPRR has implemented free- <br /> phase product removal using: product skimmers, bailing, bilge bags, <br /> dual-phase extraction (DPE) system, and hydrophobic absorbent socks. <br /> These actions have removed approximately 1,011 pounds of total <br /> extractable petroleum hydrocarbons as diesel using the DPE system and <br /> approximately 650 pounds of free-phase product using the skimmers, <br /> bilge bags, absorbent socks, or the oil/water separator. <br /> As previously stated, historically, free-phase product has been observed <br /> in 11 wells at the site. However, since shutdown of the DPE for the <br /> Rebound Evaluation (ERM, 2003) in July 2002, free-phase product has <br /> been detected most consistently and at the greatest thickness in the <br /> following three wells: MW-06A, PZ-01, and TW-01 (Table 1 and <br /> Figure 3). Since shutdown of the DPE, hydrophobic absorbent socks are <br /> the only active product removal activity being performed. The Regional <br /> Water Quality Control Board (RWQCB) has indicated that more <br /> aggressive removal of the remaining product will be required in order to <br /> get site closure. <br />