10705 HOLLY DR 2018-02-01 - Laserfiche WebLink

� � • .__ ! Technical Memorandum—Habitat Assessment for Holly Drive Lift Station Upgrade December 23, 2015 species and habitat will be minimal, and that federal permits and ESA consultation may not be required. In the event that federal permits and associated ESA consultation are required, this document will be updated for consultation with the Services. PROJECT LOCATION Project Area The District's Holly Drive Lift Station is located at 10705 Holly Drive in a residential area near the southern extent of the Everett city limits (Parcel 00552300401401). The lift station is located immediately adjacent to the headwaters of Swamp Creek and the proposed work will occur within the 100-foot stream buffer for this stream established by EMC 19.37.170. It should be noted that the WDFW Salmonscape Database indicates that salmonids do not utilize habitat in Swamp Creek above Lake Stickney approximately 2 miles downstream of the project area, which could be grounds for a reduced stream buffer (50 feet) at the lift station site. Project Setting The Holly Drive Lift Station is located on a 0.2-acre parcel with a paved parking area covering most of the site within the fence line. Juniper bushes planted around the building, and holly and rhododendrons planted beyond the pavement and inside the perimeter fencing, comprise the vegetation on the site. A driveway provides access from Holly Drive from the north along the east side of the site. The areas to the north and east are occupied by single-family residences and arborvitae hedges are present along the outside of the northerly and easterly fence lines, providing a buffer between the lift station and residential yards. Swamp Creek headwaters are located approximately 20 feet to the west of the lift station fence line and a narrow band of largely native riparian vegetation(Douglas fir, alder, cottonwood, salmonberry, etc.) lines the stream; non-native plants present include Himalayan blackberry, bamboo, and holly. The building is located approximately 30 feet north from the fence line and about 50 feet from the current edge of Swamp Creek, which was about 6 inches below the Ordinary High Water Mark(OHWM) during the site visit. Shallow floodwaters from this stream have been known to cover the western portion of the paved area surrounding the building in recent years. The new wet well will be installed in this area, which will necessitate either filling the area, or constructing a berm or floodwall to protect the proposed below-grade infrastructure. The project site is approximately 2 stream miles upstream of the nearest recorded occurrence of salmonids approximately 0.5 mile below Lake Stickney (WDFW Salmonscape Database), species present included coho and sockeye. The nearest record � � 1 �'