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margin and to minimize down-time due to mechanical problems, five new <br /> extraction wells will be installed as part of this remedial action. New <br /> extraction wells are discussed in latter sections of this RDIP. The <br /> infiltration system will also be upgraded as part of this remedial action. <br /> The upgraded infiltration system is also discussed in this RDIP. <br /> Pilot Testing <br /> A dual phase extraction pilot test was conducted at the site to evaluate the <br /> feasibility of dual phase extraction. A description of this pilot test and <br /> results of pilot testing are contained in Appendix A of Conceptual Design 2- <br /> Pliase VOC Remediation Workplan, Union Pacific Railroad Company, Tracy <br /> Yard, Tracy, California (ERM-West, Inc., August 15, 1997). <br /> 2-4 <br />