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Request for Technical Revision <br />Colorado Division of Reclamation, Mining and Safety <br />Scope of Work for US 287 Realignment Geotechnical Investigation <br />Boettcher Limestone Quarry <br />Permit No. M1977348; Permit Type: 112C <br />Larimer County, CO <br />Yeh and Associates (Yeh) proposes the following geotechnical investigations supporting the realignment of <br />US Highway 287 as part of the new Glade Reservoir project. The proposed new alignment will take off from <br />US 287 at the south end of the Holcim Boettcher Quarry, and follow the main quant' road north before <br />turning westward through the hogback, rejoining the existing US 287 highway north of the planned <br />reservoir. The purpose of the geotechnical investigation is to support design recommendations for <br />pavements, embankments, soil/rock cuts and roadway structures intended for the new alignment. Yeh is <br />subcontracted under Muller Engineering who, in tum, is the roadway project design lead for Northem <br />Colorado Water Conservation District. Northern Water will be transferring ownership of the new highway to <br />the Colorado Department of Transportation (CDOT) upon construction completion. <br />Subsurface Exploration Equipment <br />Investigation borings will be drilled by Authentic Drilling based out of Castle Rock, Colorado. Some of the <br />borings will require difficult access drill rigs, such as a CME 551300 rubber track rig or a CME 55OX Buggy <br />rig, shown in Figures 1 and 2. Utilizing these rigs will keep ground disturbance to a minimum, eliminating <br />the need for access road/trail pioneering via bulldozer. Authentic Drilling lists the ground pressure from the <br />rigs as 4.4 psi for the CME 551300 and 6.0 psi for the CME 550X — relatively light loads expected to <br />minimize the possibility of rutting. If soft soils are encountered and minor rutting occurs, track marks will be <br />raked or graded out immediately following drilling completion at each site. <br />Figure 1. CME 551300 track carrier drill rig (credit: Central Mine Equipment Company) <br />