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

ASPECT CONSULTING 32 FINAL PROJECT NO. AS190583A-08  MAY 21, 2025 less than the 10 mg/kg industrial soil screening level. Appendix C to the RI/FS Work Plan (Aspect, 2013c) provides a discussion of PCB management at the mill since the 1980s, including agency inspections, based on available information. PCB-containing transformer locations are depicted on Figure 2-2. 3.1.10 Removal of UST No. 68R (1999) In November 1999, BEK McDonnell Engineering (BEK) conducted a site assessment during the permanent decommissioning by excavation and removal of a 500-gallon unleaded-gasoline UST and associated dispensing pump located northwest of the K-C distribution warehouse (hazardous substance location 10 on Figure 2-2). BEK’s site assessment consisted of collecting and analyzing three soil samples from the final limits of the UST excavation, one sample from under the pump island, and completing Ecology’s site assessment checklist. BEK reported that the removed UST was in very good condition, with no visual evidence of corrosion or holes. BEK reported that groundwater was not observed in the tank pit prior to removal of the tank; however, a slight gasoline sheen was observed on pea gravel at the base of the tank pit. A pressurized water line was present within the tank pit and was supported beneath by gravel fill. To avoid disturbance of the water line, the fill was not removed; therefore, soil sampling beneath it was not conducted. Gasoline-range TPH and BTEX were not detected in the four soil samples collected from the tank pit. Based on the results of the site assessment, BEK concluded that contamination was not present in the tank pit or adjacent pump island area. Although the base of the tank pit was reportedly above the water table, gasoline sheen was reportedly observed at the pit base, but there were no data to verify whether groundwater had been impacted. 3.1.11 Bunker C Fuel Oil Soil Removal, Bleach Unit 2 (1999) During the 1999 construction of Screen/Bleach Unit 2 and associated relocation of a water line at the northeast corner of Screen/Bleach Unit 1, soil contaminated with Bunker C fuel oil was reportedly encountered (HREC 3 in AECOM, 2011). The inferred source was an abandoned fuel pipeline between the fuel tank farm on the south and the boiler house on the north. An estimated 15 cubic yards of contaminated soil was removed and disposed of during the 1999 construction project. No sampling was conducted within the excavation following soil removal (K-C, 1999). 3.1.12 Latex Spill Investigation (2009) Aspect (2009) conducted an investigation to evaluate a release of latex product (AIRFLEX® EN1165) that occurred proximate to the southwest corner of the tissue mill between September and November 2008 (immediately east of hazardous substance location 22 on Figure 2-2). The latex product contained less than 1 percent vinyl acetate and less than 0.1 percent acetaldehyde, 1,4-dioxane, ethylene oxide, and formaldehyde. K-C used the latex in manufacture of household paper towels and unloaded it from tank cars at the terminus of a rail spur that runs along the loading dock.