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TALUS A 660-acre development on the east side of Cougar Mountain in the City of Issaquah that deeded 440 acres to King County as dedicated open space and provided 1735 residential units, 50,000 square feet of retail and 800,000 square feet of office space. More than 100,000 feet of piping was installed between September 2000 and November 2002 Spotlight Non-traditional and complicated sequence of construction required to fulfill the owner's commitments. Problem To meet expectations for this master planned project, it was necessary to construct the job from the top down. The project had to be constructed without the benefit of existing adjoining infrastructure. Offsite work required to service the project would only be permitted and constructed in subsequent years. A major portion of the backbone roads, utilities and ponds were completed during the first season of construction. During the second year, more backbone infrastructure, parcel development, and reservoir work was begun. Late in the second year, offsite work was also started. Early in the third year, construction began on the Booster pump station. Sales agreements required recording of parcels and the ability to meet fire flow needs, which would allow combustible construction prior to the completion of offsite work. Without the completion of the offsite work and booster pump station, water for fire flow and testing would not be available by conventional means. Solution The backbone infrastructure was in place and Neighborhood C (one of the parcels), was built to a point in close proximity to a low-pressure, offsite water system. It was feasible that with the reservoir completed, water could be drawn from the low-pressure system and pumped uphill to the reservoir through the new piping with a temporary high-lift diesel pump. This would provide the necessary water for fire flow on an interim basis. The City of Issaquah confirmed and agreed that the necessary capacities could be met if the required components could be completed, tested, and accepted in a sequence and within a time frame to meet committed parcel recording dates. Results A completion plan and schedule were developed, based on the availability of plan approvals that would complete all outstanding work within six weeks. A tie-in to the low-pressure system was made and a high-lift diesel pump installed. The reservoir and remaining portions of the waterline were completed, tested, flushed, and purified. The reservoir was filled and accepted. All work was completed, tested and accepted by the City of Issaquah to allow recording as committed. Acknowledgements
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