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Work Plan, PFAS Site Inspection <br />Naval Computer and Telecommunications Station Stockton, California Background Information <br /> 2-3 DCN: TRBW-0202-5183-0010 <br />2.1.5 Water Sources <br />The Central Valley Region Basin Plan designates several beneficial uses to water within the <br />Sacramento‐San Joaquin Delta, including RRI (Water Board 2018). Beneficial uses designated to <br />groundwater include municipal and domestic drinking water supplies, agricultural supply, and <br />industrial supply. <br />2.2 Ecological Setting <br />To the north and northwest of NCTS Stockton is the city of Stockton, which includes residential <br />housing and industrial development. To the south and southeast of RRI is agriculture. There are <br />also several riverine habitats adjacent to RRI. The Calaveras River merges with the Deep Water <br />Channel near the northwest corner of RRI, and the San Joaquin River merges with Burns Cutoff <br />in the south-southeast boundary of RRI. Ecological receptors utilize the Deep Water Channel and <br />Burns Cutoff surrounding RRI, along with the wetlands and upland RRI areas, as natural resources <br />and habitat. The Deep Water Channel is wide and the city of Stockton is located on the east side. <br />Burns Cutoff is not as wide and is bordered on both sides by a brushy riparian habitat. Burns Cutoff <br />is a valuable aquatic and terrestrial wildlife corridor within the larger delta ecosystem. The <br />vegetation is similar to the drainage channel habitat, but with a larger , more extensive canopy and <br />provides feeding and nesting habitat for numerous species. <br />Faunal species of special concern have been confirmed at RRI or within a 1-mile radius of the <br />property including the northwestern pond turtle (Actinemys marmorata), double-crested cormorant <br />(Phalacrocorax auritus), northern harrier (Circus hudsonius) and the short-eared owl (Asio <br />flammeus). The Swainson’s hawk (Buteo swainsoni) (State-listed threatened) has also been <br />confirmed in the wildlife area, the agricultural fields, and at off -site locations (PRC 1997). Many <br />migratory bird species use the duck pond, Burns Cutoff, and the Landfill Area of RRI. Protected <br />floral species have not been observed during seasonal site walk surveys (PRC 1997, ERS 2012 ). <br />2.3 Regulatory Setting <br />PFAS have been used in a variety of applications; however, the use of aqueous film-forming foam <br />(AFFF) in firefighting, firefighting training, and fire suppression systems is considered to have the <br />greatest potential for release of PFAS to the environment in terms of mass and concentration at <br />Navy installations. Other potential sources of PFAS to the environment include operation wastes, <br />historical on-site land disposal areas and landfills of PFAS-containing materials, wastewater <br />treatment sludges and effluents, and releases of other PFAS-containing materials. <br />AFFF containing PFAS was developed in the 1960s for use on Class B fires (that is, fires in <br />flammable liquids or vapors), and was put into routine use by the early 1970s. Class A firefighting <br />foams were used to extinguish wood and grass fires, and do not contain PFAS. Therefore, Class A <br />firefighting foams are not a concern for NCTS Stockton.