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Among OUr Tunneling ProjectsMissouri Project Coldwater Sanitary Relief Section A, Phase II (89119B) Owner/Client Metropolitan St. Louis Sewer District Location Unincorporated St. Louis County, Missouri Details 2,280 linear feet, 96-inch diameter tunnel Challenges and solutions The purpose of this project, which involves construction of sanitary sewers, is to alleviate excessive infiltration causing overloaded sanitary sewers. State Missouri Project Manchester Avenue Combined Sewer Relief Project Owner/Client Metropolitan St. Louis Sewer District/Bates Utility Co. Inc. Location North of the River Des Peres and west of Macklind Ave., St. Louis, Missouri Details Construct 10-foot diameter tunnel and install 618 linear feet of 84-inch diameter pipe Challenges and solutions SAK was subcontracted by Bates Utility to construct a 10-foot diameter tunnel and install 618 linear feet of 84-inch diameter pipe in the tunnel. This work was part of a larger project designed to alleviate basement backups and flooding due to overcharged combined sewers. Michigan Project City of Allen Park, Storage Tunnel Project Owner City of Allen Park, Michigan Client Location Allen Park, Michigan Details 3,045 linear feet of 96-inch diameter tunnel sewer, 1,400 linear feet of force main, 2,300 linear feet of relief sewers, 400 linear feet of pipe bursting, 28.4 cfs pump station, and related work. Challenges and solutions The prime contractor on this project, Pamar Enterprises, Inc., subcontracted SAK to complete the construction of the 3,045 linear foot 142-inch ring beam and lagging, and liner plate tunnel (TBM) liner, and the installation of the 3,045 linear feet of 96-inch diameter RCP pipe. This project is currently in progress, and SAK’s portion of the work is slated for completion in October 2010. Texas Project Downtown Wastewater Tunnel Project Owner/Client Austin Water Utility; City of Austin, Texas Location Austin, Texas Details 18,600 linear feet of 8-foot to 10-foot diameter tunnel to install carrier pipe of 54 inches to 90 inches in diameter. Challenges and solutions The Downtown Wastewater Tunnel will expand the capacity of the wastewater system to accommodate the continued growth of downtown and south Austin. The tunnel will extend approximately 3.5 miles and vary in diameter between 8 feet and 10 feet. The existing primary wastewater line north of Lady Bird Lake is the North Austin Interceptor (NAI). The NAI currently operates at or near capacity. Additional capacity is required in the system to accommodate continued growth and redevelopment downtown. The existing primary wastewater line south of Lady Bird Lake is the South Austin Interceptor (SAI). The SAI is expected to reach capacity around 2010, and additional capacity is required in the system to accommodate continued growth and redevelopment in south Austin. A major weak point in the system is the Shoal Creek Lift Station. During periods of high flow and heavy rain, the station surcharges, resulting in overflows in the system. The Downtown Wastewater Tunnel project will eliminate overflows in the NAI, relieve flows in the NAI downstream of the Shoal Creek Lift Station, remove the Shoal Creek Lift Station and Toomey Lift Station from the system, relieve flows in the SAI and create additional capacity in the wastewater system for continued growth near downtown Austin. Project completion is slated for March 2012.
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