2725 32ND AVE NE 2018-01-02 MF Import

r t , :Y Landfill Closure Improvements The Weyerhaeuser Smith Island site is an inactive landfill located west of Highway 529 and the Burlington Northern Railway railroad tracks and north of the Main channel of the Snohomish River. It was used to dispose of dredged materials from the wastewater treatment system associated with the former Weyerhaeuser Kraft pulp and mill. This 30- acre landfill was closed in 1994 in accordance with a variance for a vegetative closure approved by the Washington Department of Ecology (Ecology) and the Snohomish Health District (SHD). Over time, it became apparent that additional closure improvements were needed. These improvements will result in a re -graded and covered landfill with improved drainage. Figure 3 presents a site plan that shows the proposed closure improvements. Figure 4 depicts the cross section of the proposed landfill improvements. The very wet nature of the waste in the landfill makes it difficult to work with even during the driest time of the year. Accordingly, in order to re -grade the waste and place additional fill .soil over it, it will be necessary to first stabilize the waste and/or provide engineered reinforcement of the waste during a dry summer season before continuing with the grading and cover construction. This will necessitate that Weyerhaeuser complete the landfill improvements over two construction seasons. The first season (2004) will include stabilizing and/or reinforcing the waste and placing fill soil to improve drainage of the landfill. In order to access the landfill for placing the fill soil, an access road will be constructed across the existing perimeter ditch and into the west end of the landfill. In addition, the existing access road on the east side of the landfill will be widened and improved for construction vehicle access. The _zecond season (2005) will include construction of the cover system, surface water system, -)ermanent access roads, and related facilities for permanently improving the cover and drainage of the landfill. All closure improvements are planned to be completed by the fall of 2005.