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

WEYERHAEUSERSIXTH ISUANDLANDFILL CLOSURE IMPROVEMENTS AND NPDES OUTFALL 005 ELIMINATION $EPA ENVIRONMENTAL CHECKLIST precautions will be taken to minimize dust and emissions generated by construction activities. b. Are there any off -site sources of emissions or odor that may affect your proposal? If so, generally describe. No. c. Proposed measures to reduce or control emissions or other impacts to air, if any: Measures to control impacts to air are not expected to be necessary for this project. If emissions are generated during dry or windy conditions, the use of wet suppression techniques, as practical, and curtailment during high winds will be adopted. 3. Water a. Surface: 1) Is there any surface water body on or in the immediate vicinity of the site (including year-round and seasonal streams, saltwater, lakes, ponds, wetlands)? If yes, describe type and provide names. If appropriate, state what stream or river it flows into. Smith Island is a distributary bar of the Snohomish River and is located on the north side of the main channel of the Snohomish River. The confluence of two Snohomish River distributaries, Union Slough and Steamboat Slough: occurs at the north end of Smith Island. Possession Sound is located less than one mile west of Smith Island. The landfill is not a wetland since it contains waste materials and does not have hydric soils, a necessary component of a wetland. The area north of the landfill (see Figure 3) is considered a Category 3 wetland with emergent vegetation. This land, however, is located within an industrial, disturbed setting. The vegetation is also mowed annually throughout this area. 2) Will the project require any work over, in, or adjacent to (within 200 feet) the described waters? If yes, please describe and attach available plans. The landfill improvements will not impact wetlands. Outfall 005 is located within 200 feet of the Snohomish River. It will be decommissioned by sealing the existing tide -gate shut and filling the existing culvert with concrete from the ditch side of the culvert (Figure 5). Ditch maintenance and closure of the Outfall 005 will occur in land technically designated as wetland. Regulatory jurisdiction over the ditch and closure of Outfall 005 falls within the NPDES permit program. Any ditch maintenance for the Outfall 005 or the landfill will not result in the loss of any wetlands. Removal of non-native invasive vegetation within the ditch would be considered as a net benefit. 3) Estimate the amount of fill and dredge material that would be placed in or removed from surface water or wetlands and indicate the area of the site that would be affected. Indicate the source of fill material. 13