29312 LAKE CHAPLAIN RD SEPA 017 - 002 - CULVERT REPLACEMENT UNDER LAKE CHAPLAIN Land Use Decision Documents 2025-04-17

b. Are there any off-site sources of emissions or odor that may affect your proposal? If so, generally describe. Jhelpl There are no known emissions/odors that will affect this project. c. Proposed measures to reduce or control emissions or other impacts to air, if any: Jhelpl Standard emission control devices, in conformance with federal and state air quality standards for the specific class and type of equipment,will be utilized during the project activities. In addition,standard BMPs will be utilized as needed for dust control(e.g. spraying). 3. Water Jhelpl a. Surface Water: 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 tt flows into. 'help' The project is located within and along Woods Lake Creek. Woods Lake Creek flows into the Sultan River 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. Jhelpl The work will be located below the ordinary high water line of Woods Lake Creek and immediate adjacent areas.Project plans are attached. 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. Jhelpl Material placed in the footprint of the existing road bed will replace material that is removed. • Fill to create proposed channel at culvert will cause 200 cubic yards of fill • Excavation to footing elevation below the OWHM will have 282 cubic yards of excavation Place streambed sediments through entire reach below the OHWM will cause 530 cubic yards of fill. 4)Will the proposal require surface water withdrawals or diversions? Give general description, purpose, and approximate quantities if known. Jhelpl Removal of the culvert,roadway embankment and associated fill will require a temporary stream diversion.The channel is typically dry during the anticipated in-water work period as the flows tend to go subsurface through the gravel. There can be some minimal at the downstream where water resurfaces. Dewatering the channel will be proposed prior to the excavation required for the channel reconstruction. It is anticipated that the temporary stream diversion will require a system of coffer darns,pumps and hoses to convey the stream around the work area.The work SEPA Environmental checklist(WAC 197-11-960) July 2016 Page 6 of 18