3815_PGSF WMVD Pkg 2_Vol 4-2_03.03.2026_BXWA_Certified

ASPECT CONSULTING PROJECT NO. AS190583A-08  MAY 21, 2025 FINAL 29 fingerprinting soil sampling results, that the hydrocarbon in the AST area is likely not the same material present at the ExxonMobil ADC site south of K-C’s warehouse; the letter also indicates the intent to further characterize hydrocarbon contamination in the area. 3.1.7 U.S. Navy’s Independent Cleanup of Naval Reserve Parcel (1996-1998) K-C engaged in a land exchange with the U.S. Navy in the mid-1990s. The land exchange deeded K-C land at the north end of the mill property to the U.S. Navy in exchange for a Naval Reserve property located between the paper mill and the new secondary treatment plant. According to Mr. Robert Waddle, formerly of K-C, the land deeded to K-C from the U.S. Navy in the property transaction included Tax Parcel No. 29051900201300 (Figure 2-1). As part of the exchange agreement, the U.S. Navy agreed to remediate contamination previously identified on that parcel (K-C, 1997b). This area was identified as HREC 2 in the Phase 1 ESA (AECOM, 2011). Foster Wheeler (1998) documents the U.S. Navy’s independent cleanup of the Naval Reserve Parcel as part of the land exchange. According to the report, the Naval Reserve Center was commissioned in 1949 and served as the administrative and operations center for local naval reserve activities. From 1947 to about 1981, naval vessels regularly docked at the Naval Reserve Center dock, which remains in place. The Naval Reserve Center included a combined garage/shop, boiler room, and diesel generator room (Building 1); and to the east, a Firing Range (Building 2). Two diesel USTs (5,000-gallon Tank 1 and 3,000-gallon Tank 2) were located immediately south of the boiler room and supplied fuel for the steam boiler and electrical generator. The two diesel USTs were removed in July 1996. A hole was observed in Tank 1 during its removal. No visible flaws were documented for Tank 2 during its removal. Following removal of the USTs, Foster Wheeler collected confirmation soil samples from the excavation. Diesel-range TPH soil contamination was detected within the excavation around each of the tanks, with detected TPH concentrations up to 16,000 mg/kg. Based on that first round of confirmation sampling, the excavation pits were overexcavated and sampled again. The excavation depth was approximately 12 feet bgs, extending below the water table. In addition to the tank pits, an exploratory test pit was excavated and sampled approximately 5 feet south of the southern excavation limit. The petroleum hydrocarbon-contaminated soil was removed for off-Site thermal desorption. Following over-excavation, a second round of excavation verification soil samples indicated residual diesel contamination present on the excavation bottom and south of the excavation. Diesel-range TPH was detected at 42,000 mg/kg in the sample of soil from the bottom of the excavation near its center. TPH was not detected in samples collected on the south, north, and west sidewalls, respectively, of the excavation. The soil sample collected on the east sidewall contained 260 mg/kg diesel-range TPH. Three soil samples were collected from different depths in the exploratory test pit just south of the excavation. Detected diesel-range TPH was not detected in the 5-foot sample,