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

ASPECT CONSULTING 8 FINAL PROJECT NO. AS190583A-08  MAY 21, 2025 In addition to describing closure of the HWAU, Appendix A to the RCRA Closure Report summarizes the mill’s historical hazardous waste management, as well as Ecology’s dangerous waste inspection during the mill closure activities, which concluded that waste management activities were being conducted in conformance with state Dangerous Waste Regulations requirements (Ecology, 2012b). That appendix also includes maps depicting locations of hazardous substance use/storage dating back to the early 1980s. That historical information has been incorporated into this RI/FS report. Specifically, Figure 2-2 depicts historical features of the pulp and paper mill, including labeling of the mill buildings; it also depicts locations where hazardous substances were used and/or stored within the mill, as identified from the historical maps. Appendix C of the RI/FS Work Plan (Aspect, 2013c) includes annotated copies of historical maps that were sources for the hazardous substance locations depicted on Figure 2-2. 2.2.4 History of Bulk Fuel Storage and Distribution The southern portion of the Upland Area was partially developed by 1930, including two bulk petroleum product tank farms and smaller petroleum product storage and distribution facilities with associated railroad spurs owned by Tidewater/Associated Oil Company (predecessor to Texaco) and by Standard Oil/Chevron (Figure 2-2). The Tidewater/Associated Oil Co. facility was located near the northwest corner of the current distribution warehouse. Several ASTs, located immediately north of the distribution warehouse, were used for the storage of gasoline and fuel oil (Figure 2-2). The Tidewater/Associated Oil Co. facility was purchased by the Scott Paper Company in 1957. Scott Paper used the ASTs for storage of Bunker C fuel oil (to fire the mill’s boilers) until 1995, when K-C converted to biomass fuel for the boilers with diesel fuel as a backup fuel source. The ASTs located north of the warehouse were removed by the late 1990s. K-C’s diesel fuel was stored in an AST with secondary containment just north of the warehouse’s northeastern corner. The Standard Oil facility was located south of the Associated Oil facilities, within the current distribution warehouse footprint, and included at least seven ASTs that were used for the storage and distribution of fuel oil, according to Sanborn Fire Insurance maps dated 1950 and 1957. The original distribution warehouse was constructed by 1959. The Standard Oil/Chevron property was reportedly purchased by the Scott Paper Company in 1967, after which a southwestern extension to the distribution warehouse was added in the 1970s. 2.2.5 Naval Reserve Property In the mid-1990s, K-C made a property exchange to acquire the Naval Reserve Property, located just south of the wastewater treatment plant. The property structures, including offices, garage, boiler room, flammable storage shed, diesel underground storage tank (UST), gasoline UST, machine/wood shop, classroom, and a firing range, were removed at that time. Prior to the property exchange, the U.S. Navy identified and remediated some contaminated soil attributable to their uses of the property, as described in Section 3.1.7.