Otak’s role in the project encompassed land use and conceptual master planning as well as capital facilities and infrastructure planning. Public outreach and participation were part of the design process, along with working through regulatory guidelines. Otak managed the development of the Supplemental EIS and provided technical analysis, and developed a master drainage plan, land use plan, and identified fish barriers for removal. The city also asked for improvements to roads, stormwater, and utilities.
In developing alternative plans, Otak was able to devise a way to daylight Miller Creek, taking a reach of the stream from flowing almost completely through a pipe network to bringing it up to ground level as a natural feature. This design brought an extended contract that also includes building a floodplain trailhead and trail that connect the Miller creek floodplain.
In addition to daylighting the stream, Otak also was able to include a fish passage in its design creating additional salmon spawning habitat along Miller Creek and working towards the goals of restoring the Puget Sound Watershed.
The final design also integrates with three regional stormwater infiltration facilities, a constructed floodplain wetland, and dispersed green stormwater treatment facilities, a new regional trail along the Miller Creek corridor, and public open space. The green stormwater facilities will treat and infiltrate stormwater runoff from approximately 50 acres. The plan allows for simulating the natural hydrology of the area through the addition of rain gardens, biofiltration, and the creation of wetlands that enhance habitat and a wildlife corridor.
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