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Work Plan, PFAS Site Inspection <br />Naval Computer and Telecommunications Station Stockton, California Background Information <br /> 2-8 DCN: TRBW-0202-5183-0010 <br />Storage of AFFF, the potential use of AFFF equipment, and the potential for conducting spray <br />tests on paved surfaces or parking lots near Firehouse #1 increase the likelihood of the potential <br />presence of PFAS constituents in soil, groundwater, or surface water. Based on the observations <br />of the 2019 site walk, results of the site research, and interviews with persons knowledgeable of <br />the site, the PA recommended soil and groundwater sample collection beneath the area of the <br />paved surface in front of the truck bays and in the parking lot south of the fire station for PFAS <br />analysis. Additionally, sediment in the stormwater catch basins near Building 705 and situated <br />along the west bounding drainage channel may be impacted by PFAS if equipment testing or <br />firefighting training activities were conducted in the area; therefore, sediment sampling for PFAS <br />analysis was also recommended. <br />2.4.2.4 AOC 02 - Firehouse #2 <br />Building 117 is the second of two former fire stations at NCTS Stockton. The former Firehouse <br />#2 is located at the northeast corner of Fyffe Avenue and James Drive (Figure 1-2). Building 117 <br />is a two-story rectangular structure. Inside, in addition to two truck bays, there is office space and <br />a kitchen on the ground floor and sleeping quarters upstairs. The area surrounding Firehouse #2 is <br />landscaped with grass and trees. Asphalt driveways leading to the truck bays are located along the <br />east and west side of the building. North of the building is a large gravel parking lot. The building <br />is currently used by the local Stockton Firefighters Union as a meeting hall. Two antique firetrucks <br />are stored in the lower level in the truck bays that were once showcased in City of Stockton <br />parades. <br />According to the interviews conducted during the PA (Trevet-Bay West 2019), AFFF was not <br />stored in Firehouse #2, foam equipment testing was not conducted inside or outside of the building, <br />nor were any firefighting training activities conducted in the vicinity of Firehouse #2. However , if <br />any foam equipment testing or firefighting training activities using foam were conducted on the <br />concrete areas outside the station or in the parking lot on the north side of the building, the <br />stormwater ditches located north of the building would have likely captured runoff from the <br />parking lot and conveyed it into the drainage channel system, which ultimately makes its way to <br />Burns Cutoff. <br />Potential storage of AFFF, the potential use of AFFF during firefighting training activities, and the <br />potential for conducting equipment tests on paved surfaces or parking lots near Firehouse #2 <br />increases the likelihood of the potential presence of PFAS constituents in soil, groundwater, or <br />surface water. Furthermore, evidence of the storage of AFFF in Firehouse #1 was identified during <br />the PA and similar practices may have occurred at Firehouse #2. The PA recommended soil and <br />groundwater sample collection from the area of the paved surface in the parking lot north of the <br />fire station for PFAS analysis. Additionally, sediment in the stormwater drainage ditch on the north <br />side of Building 117 may be impacted by PFAS if equipment testing or firefighting training