10705 HOLLY DR 2018-02-01 - Laserfiche WebLink

� _ • Technical Memorandum—Habitat Assessment for Holly Drive Lift Station Upgrade December 23, 2015 Action Area for the proposed Holly Drive Lift Station project will extend for 1/2 mile in all directions from the project site. Water Quality and Quantity Construction BMPs for the control of erosion and sedimentation will be implemented so that the quantity and quality of stormwater generated on, and leaving the site, will not change significantly. Construction will occur during the drier summer months to minimize the potential for erosion and sedimentation of Swamp Creek headwaters immediately to the west of the lift station. Any construction-generated sediment that might eventually reach the creek adjacent to the lift station would likely settle out within 1/2 mile downstream of the project area. Removal of non-native vegetation from the floodplain of upper Swamp Creek adjacent to the lift station and replanti:ng disturbed areas with native vegetation would help to improve riparian cover and protect water quality in the Swamp Creek headwaters. Human Disturbance Generally, human activity at the Holly Drive Lift Station site is limited to daily visits by maintenance personnel, primarily within the lift station fence line. Construction of the proposed improvements and removal of the existing sewage pumping and conveyance infrastructure will increase human activity on the site during daylight working hours through the summer of 2016. Once construction is complete and the lift station upgrade is operational, human disturbance on the site should return to current levels. SPECIES AND HABITAT EVALUATIONS The WDFW Priority Habitat and Species Website and Salmonscape Appllications, and the U.S. Fish and Wildlife Information, Planning, and Consultation (IPaC) VVebsite were reviewed, and the status of the species protected under the ESA by the National Marine Fisheries Service were confirmed for the preparation of this report. Aquatic Species Evaluation • Puget Sound Chinook Salmon ESU • Puget Sound Steelhead DPS • Coastal-Puget Sound Bull Trout The WDFW Salmonscape Application indicated that Chinook salmon and steelhead in Swamp Creek are not known to ascend above a point approximately 0.75-mile downstream of the entrance to Lake Stickney, which is approximately 2 miles � ��