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Work Plan for Groundwater Monitoring Well Installation, Soil Gas and Groundwater Investigation, and Groundwater Monitoring Army Aviation Support Facility, Stockton, California inlet to the east. Grab groundwater and soil gas sampling addressed in this Work Plan are proposed pursuant to those discussions. This Work Plan is organized as follows: • The remainder of Section 1 presents project objectives and scope, and provides details regarding site location, description and history, setting and geology, regional and site hydrogeology, and the conceptual site model (CSM); • Section 2 presents a summary of UST removal activities and previous environmental site investigations; • Section 3 describes the proposed field and reporting activities intended to meet the stated project objectives and fulfill the scope of work; • Section 4 provides details regarding project report deliverables; • Section 5 addresses a preliminary proposed project schedule; • Section 6 details the project Quality Control Plan (QCP); and • Section 7 lists references cited in the preparation of this Work Plan. Figures and Tables referenced in the text are presented as Appendix A and Appendix B to this document, respectively. The Accident Prevention Plan (APP)/Site Safety and Health Plan (SSHP) is presented as Appendix C. 1.1 PROJECT OBJECTIVES AND SCOPE The objectives of this project are to: • Complete delineation of the extent of impacts to groundwater from contaminants released from the former USTs at the site; • Establish a groundwater monitoring network from which groundwater flow direction and gradient can be estimated; and • Evaluate the occurrence and potential source of chlorinated solvent impacts to groundwater associated with releases from the former and current site wash racks and associated surficial drainage system. To achieve the stated project objectives, the following scope of work has been developed: • Install and develop four groundwater monitoring wells at the site, including one well near the location of the former 20,000-gallon USTs, one well upgradient, and two wells downgradient of the previously determined groundwater impacts related to former USTs at the site; • Advance approximately 30 soil borings in the immediate vicinity of the current and former wash racks and along the approximate alignment of the surficial drainage system along the southern site margin, for the purpose of collecting grab groundwater and soil gas samples to assess VOC impacts at the site, and to determine whether these impacts have a potential offsite migration pathway; • Have the horizontal location and vertical elevation of each well and soil boring surveyed by a California-licensed land surveyor; OTIE 2