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SR 900 Reconstruction 3,600 lineal feet of SR 900 through Issaquah, requiring total infrastructure installation to service the new Talus community in Issaquah, WA. Utility installation required more than 20,000 lineal feet of piping between November 2001 and March 2002 at a cost of $3.9 million. The work included the installation of: two regional water lines, a trunk sewer main, two separate storm lines and a regional dry utility corridor. Spotlight Nighttime winter work requiring import/export and restoration to traffic conditions, including asphalt pavement, prior to 5:30 AM daily. Problem Full reconstruction of 3,600' of a heavily traveled state route required under a three-month temporary nighttime closure between 8:00 PM and 5:30 AM. The schedule required that an average of more than 300' of pipe be installed each work shift and the road be repaved and open to traffic by 5:30 every morning. In the event that the roadway was not restored to traffic by 5:30 AM a significant financial penalty would apply. Solution Sajasa developed a work plan that would allow two separate pipe crews to work simultaneously throughout much of the schedule and still maintain access for import/export of trench spoils and delivery of asphalt, bedding and pipe materials. Pipe materials were staged at the beginning of each shift, as equipment was mobilized to the work area. The work plan provided that at a specific time during each shift—depending on backfill status and required quantity of trench line paving--excavation was terminated to allow backfill to catch up and paving to proceed. Results All utility installation was completed on schedule,and the roadway was opened to traffic by 5:30 AM every day. Acknowledgements
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