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Work Plan, PFAS Site Inspection Naval Computer and Telecommunications Station Stockton, California Background Information 2-5 DCN: TRBW-0202-5183-0010 transferred property to be used in a manner consistent with the nature and mission of the Federal Agency that sponsored the conveyance. Because MARAD sponsored the conveyance, RRI is required, in accordance with federal law, to remain and function as a port facility (ERS 2012). In 2003, the Port of Stockton, the DTSC, and the Water Board entered into a consent agreement during the Phase III early transfer of parcels. The Port of Stockton and the Navy entered into an ESCA dated 2 July 2003 (document number N62474-03-2-001), pursuant to which the Navy would provide funding to the Port of Stockton for certain environmental services (defined in Section 211 of the ESCA) including response and corrective actions necessary to protect human health and the environment. A covenant and agreement to restrict use of property between the Navy, the Port of Stockton, the DTSC, and the Water Board was recorded with the property deed on 29 September 2003 (document number 2003‐224097, County of San Joaquin). The purpose of the agreement was to ensure land use restrictions were implemented and to establish a process and timeline for the completion of response and corrective actions, including any long -term obligations. The ESCA agreement was amended in 2007 during the Phase IV property transfer (document number N62473-07-C-3002). The Port of Stockton and the State entered into a Consent Agreement, on file with DTSC, the Water Board, and the Port of Stockton, on 30 July 2008. A covenant and agreement to restrict use of property between the Navy, the Port of Stockton, and the DTSC and the Water Board was fully executed in June 2011. 2.4.2 Previous Investigations The objectives of the PA (Trevet-Bay West 2019) were to identify PFAS AOCs at NCTS Stockton and eliminate from further consideration those areas where there is no evidence of a PFAS release or suspected release. The PA was initially triggered following subsurface investigations completed at Site 3, which identified PFAS constituents exceeding regulatory criteria (discussed below). Ten potential AOCs were identified during the PA. Six of the 10 AOCs, summarized below, were recommended for further investigation for the presence of PFAS in soil, groundwater, and/or sediment during the SI. 2.4.2.1 Site 3 - The Former Firefighting Training Area Site 3, the former Firefighting Training Area, is an undeveloped property located in the central portion of the southern half of RRI, along the northern portion of the agricultural area (Figure 1- 2). Site 3 is approximately 290 feet wide by 165 feet long, or approximately 1.1 acres. The Navy used Site 3 as a Firefighting Training Area from 1950 to 19 78 (Kleinfelder 1988). Historically, four aboveground storage tanks (ASTs) with open tops (referred to as “open tanks” in historical documentation), a Burn Pit, a fuel storage area, and an equipment shed were present