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Sewage Line Built at Mount Rushmore
Keystone, SD
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Although the stone likenesses of past presidents George Washington, Thomas Jefferson, Abraham Lincoln and Theodore Roosevelt will never have to use the rest room at Mount Rushmore, that''s not the case with Mount Rushmore''s operational staff members who live and work on the premises of the national historical site in Keystone, South Dakota.
Over the years, Mount Rushmore staff housing has grown to five single family homes and one 10 unit apartment complex which increased the demand on the sites''sewage lines. In 2004, the national part and a Denver engineering and consulting firm drew plans to build a new sewage lift station at the base of the 5,700-foot mountain. Plans also included a 3,000-foot-long sewage line to run up the mountain''s steep, rough terrain to connect with another existing lift station.
Mainline Contracting, Inc., Rapid City, South Dakota, was the general contractor that began digging a trench for the pipeline in November 2005. The pipe specified for the project was 3-inhch restrained joint polyvinyl chloride (PVC) pipe ideal for demanding water and sewer, mining, irrigation and trenchless pipeline projects. Blaine Foss, utilities supervisor for Mount Rushmore, said they selected CertainTeed''s Yelomine which provided the durability and higher pressure rating needed for the project. The crew laid the pipe int he open trench and assembled it in 20-foot lengths as the crew continued to install the sewage line. Construction Bulletin, July 2006.
Trenchless Construction
Pipe size used: 3"
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