Multiple Trenchless Methods Allow for Water Supply Installation through Wyoming Terrain

摘要

The Jamestown–Rio Vista Water Supply project located in Southwest Wyoming was constructed during difficult winter conditions and included three trenchless waterline installation methods. Two crossings of the Green River (each approximately 800 feet long) were completed by Horizontal Directional Drilling (HDD); a 1,200-foot long section of 6-inch PVC pipeline was replaced with 10-inch PVC pipeline by pipe bursting; and four road crossings were completed by Horizontal Auger Boring (HAB) with 24-inch steel casing including one 600-foot long crossing of Interstate-80. Sub-freezing temperatures and flooding caused by ice jams on the Green River complicated construction. Hard rock encountered during HAB crossing of I-80 also provided complications. Fusible PVC was used for the waterline for each of the three trenchless applications on the project. The project engineer was Sunrise Engineering out of Afton, Wyoming and the General Contractor was Western Municipal Construction of Wyoming from Meeteetse, Wyoming. This paper is a case study of the project and a presentation of the lessons learned.