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• <br />Relevant Features to <br />CRRP <br />D Joint project for URS <br />and Boyle <br />0 Rugged mountain <br />conditions <br />0 Forest Service <br />Ilk permitting <br />Diamond Fork <br />Tunnels <br />Central Utah Water Conservancy District <br />355 West 1300 South <br />Orem, UT 84058 <br />Lee Wimmer <br />(801) 226 -7139 <br />Project Description <br />The Upper Diamond Fork Project is part of the Diamond Fork System that will deliver <br />water from Strawberry Reservoir westward through extremely rugged and remote <br />terrain to the Spanish Fork River, about 20 miles east of Provo, Utah. The Central <br />Utah Water Conservancy District is constructing the $60 million project to complete <br />the Central Utah Project. Key features of the project are the 5,220 -foot long Tanner <br />Ridge Tunnel and the 9,700 -foot long Red Mountain Tunnel, both with a finished <br />diameter of 9 -1/2 feet. Other features include a siphon pipeline across a steep <br />valley to join the two tunnels, a long pipeline located downstream from the Red <br />Mountain Tunnel, flow control structures, and temporary access roads. The system is <br />designed to convey 660 cubic feet per second, and will operate under hydrostatic <br />pressures up to 125 feet of head. <br />URS is responsible for all geotechnical investigations and preparation of designs, <br />plans, and specifications for the tunnels, and is providing geotechnical engineering <br />services to another firm that is designing the pipelines, flow control structures, and <br />access roads. All facilities were incorporated into a single construction contract with <br />one contract document package. <br />Both the Red Mountain and Tanner Ridge Tunnels are expected to encounter <br />interbedded, moderately strong to very strong sedimentary rocks consisting of <br />siltstone, sandstone, limestone, and conglomerate. URS completed geotechnical <br />investigations that involved geophysical surveys and 16 vertical and angled core <br />holes ranging in depth from 100 to over 700 feet. Over <br />borings were completed for the project in less than <br />specifications, geotechnical baseline report, and engineers <br />November 1999 and the protect is <br />currently out to bid with bids due <br />December 23, 1999. Work is also <br />presently underway on the tunnel <br />designs, plans and specifications. <br />Performance of the geotechnical <br />work was complicated by the difficult <br />access, with helicopters being <br />required to reach most of the sites. <br />We obtained "Special Use" permits <br />from the U.S. Forest Service, <br />constructed landing and drilling pads <br />by hand, and then restored the sites t <br />stringent Forest Service requirements. <br />4,700 feet of exploratory <br />2 months. The plans, <br />estimate were finalized in <br />HOVLLE <br />