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

WEYERHAEUSER SMITH ISLAND LANDFILL CLOSURE IMPROVEMENTS AND NPDES OUTFALL 005 ELIMINATION SEPA BNNiONMENTAL CHECKLIST b. Ground: 1) Will groundwater be withdrawn, or will water Le discharged to groundwater? Give general description, purpose, and approximate quantities if known. No groundwater will be withdrawn for the project, and no discharges to groundwater will occur. 2) Describe waste material that will be discharged into the ground from septic tanks or others sources, if any (for example: Domestic sewage; industrial, containing the following chemicals, agricultural; etc.). Describe the general size of the system, the number of such systems, the number of houses to be served (if applicable), or the number of: animals or humans the system(s) are expected to serve. No waste material or sanitary waste will be discharged into the ground. c. Water Runoff (including storm water): 1) Describe the source of runoff (including storm water) and method of collection and disposal, if any (incluc;e quantities, if known). Where will this water flow? Will this water flow into other waters? If so, describe. Stormwater is the only source of runoff from ;he Smith Island Site. Currently, the primary settling basin receives stormwater runoff from within the landfill. Solids settle out in the primary settling basin and the wastewater overflows into secondary treatment basin. Water is held in the secondary settling basin until discharged as necessary into Steamboat Slough through Outfall 001. Outfall 001 is a manually operated outfall consisting of a 48-inch diameter discharge pipe with a normally closed gate valve. Weyerhaeuser periodically discharges treated water as necessary to maintain proper water levels in the treatment ponds. 2) Could waste materials enter ground or surface waters? If so, generally describe. No waste materials will be present on the site. Minimal quantities of luL-ricants and cleaners may be used for waintenance of the stormwater lift station. No spillage of these materials to ground or surface waters is likely. The landfill cover, which is placed over buried wastes, prevents waste materials from being released to surface water. Groundwater monitoring is required by Washington State and Snohomish Health District solid waste regulations to ensure wastes are not entering groundwater. As an added measure of protection, the cover system will serve as a barrier over the waste to provide protection of ecological receptors at the site. d. Proposed measures to reduce or control surface, ground, and runoff water impacts, if any: Eliminating Outfall 005 will result in more comprehensive treatment of storm water runoff, generally improving water quality at this site. 4. Plants a. Check types of vegetation found on the site:. Deciduous tree: x alder _maple 15