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

ASPECT CONSULTING PROJECT NO. AS190583A-08  MAY 21, 2025 FINAL 7 plant included two secondary clarifiers and secondary aeration basins, from which treated mill wastewater was discharged to the East Waterway through two outfalls located adjacent to the facility (Outfalls 003 and 008) and via the deep-water Outfall SW001 shared with Weyerhaeuser and located southwest of Port of Everett’s Mill A Site, more than a mile south of the Upland Area. In 2004, K-C, with the City of Everett, constructed a deep-water outfall (Outfall 100) to replace deep water Outfall SW001, which was plugged and demolished in the nearshore area. Outfall 100 is located adjacent to decommissioned Outfall SW001 and became fully operational in 2005. Under its National Pollutant Discharge Elimination System (NPDES) permit WA-000062-1, K-C was authorized to discharge treated process wastewater, stormwater, and noncontact cooling water to deep water Outfall 100. Outfall 100 also discharges regional municipal wastewater from the Cities of Everett and Marysville. On September 5, 2012, K-C sent Ecology’s Industrial Section a notice of their intent to surrender their NPDES permit WA-000062-1. Ecology’s Industrial Section sent K-C correspondence on September 19, 2012, that the NPDES permit was terminated. City of Everett continues their permitted discharges to Outfall 100. K-C was also authorized under the NPDES permit to discharge treated process wastewater, stormwater, and noncontact cooling water from Outfalls 003 and 008 in emergencies and shutdowns. Figure 2-3 depicts locations of historical underground pipelines and outfalls at the K-C mill, based on an AutoCAD® file prepared by K-C in the 1990s-2000s from available historical maps, and thus representing a historical composite. Numerous changes to subsurface piping occurred at the former mill over its 80-year history, often with limited documentation of older changes, and because the mill demolition contract specifications required that all mill infrastructure in the upper 2 feet (and some at greater depths) be removed during the 2012-2013 mill demolition. Some piping shown may have been removed during mill operations, without documentation, and some piping was also removed during the two interim actions (see Sections 4.1 and 4.3). Consequently, Figure 2-3 displays piping that once existed, but it is not necessarily representative of current conditions. 2.2.3.3 Pulp and Paper Mill Hazardous Waste Management The pulp and paper mill was a large-quantity generator of hazardous waste (Resource Conservation and Recovery Act [RCRA] ID number WAD009250820) from the early 1980s until its closure in 2012. The mill was never a hazardous waste Treatment, Storage, and Disposal Facility (TSDF) under RCRA. The mill’s 90-day Hazardous Waste Accumulation Unit (HWAU, also known as “haz waste cage”) was a secure storage unit in which hazardous and nonhazardous waste materials generated at the mill were temporarily stored prior to proper off-Site disposal. The HWAU is located on the southeast corner of the former log pond and is shown on Figure 2-2 (co-located with item number 12 in the legend). Prior to closure, K-C accumulated waste materials within the HWAU for periods of less than 90 days and handled and disposed of the wastes in accordance with applicable requirements of the Washington State Dangerous Waste Regulations (Chapter 173-303 WAC). One of the final steps in mill demolition was to conduct clean closure of the HWAU, as described in the RCRA Closure Report for the mill (Aspect, 2013b). This report can be viewed on Ecology’s website using the link provided in Section 1.