3003 W CASINO RD BOEING AIRPORT RD ACCESS 2016-01-01 MF Import

� � downstream of Mul;ilteo 6oulevard indicates salmonids can survive the portions ot the stream. Access can be provided to 6700 lineal teet of natural habitats and access can be � improved in the lower 1200 fcet of the strcam. There is little need for extensive habitat manipulation in the drainage. DETAILED WORK PLAN � GeneralOverview � The intent of the proposed mitigation is to pro�de access by anadromous fishes to 7,900 lineal feet of spawning and rearing habitat in Powder Mill Gulch Creek. Also, it is proposed that cutthroat trout be introduced to the Wetland Pond and with future � intrcductions to sustain the population sustained by stocking. ('��tthro�t Trout Introd�rrinn� �o the Wetlnnd Pond ' Boeing will work with the Washington Department of Wildlife in identifying an appropriate race of cutthroat trout to be planted in the Wetland Pond. The fish will be 1 planted as !ry annually or semi-annually az needed to maintain a population. Presently, little is known about water quality conditions in the pond during the summer, and cutthroat may prove ill suited to the ambient conditions. If this situation occurs, Boeing will work ' with WDW in identifying an appropriate non-salmonid species for introduction into the �Vetland Pond. � Powder Mfll Gulch Creck The mitigation is targeted on providin� habitat for Coho salmon, and sea•run and � resident cutthroat trout as thcse species are best suited to the habitau available. Use by steelhead trout is also a poss�biliry, although the stream is on the smaller end or the range of stream size used by this species. 1 'Ru proposed actions include modifying four existing culverts to improve access to habitat. Also, numerous partial barriers to migration will be manipulated to improve I passage in several portions of the creek. Finally, habitat enhancement will be conducted in the stream including construction of an approximately ]/4 acre ovenvintering pond and construction of 350-400 feet of spawning habitat in the upper reaches. After construction � coho salmon fry will be stocked in the stream for several years to cstablish the run. Table 3 lists ten proposed actions that are keyed to Figuro 8 for refere nce. The actions are presented in detail in the following discussion. � 1) Provide Passage at Culvert under Railroad tracks � As previously noted,the culverts are a block to migrating salmonids. Passage will be provided by bolting baftles inside one of the culverts, while leaving the other unrestricted to pass tlood flows. Hand work at the upstream end of the culvert will be necessary to � improve pazsage condition immediately upstream of the culvert mouth. I - 24 - I