Laserfiche WebLink
The results of the CRSP3 runs for the Section running through the constructed gap are <br />• presented in Attachment 1. As can be seen in the rockfall simulation results for file <br />SCJ_GAP, no rocks are expected to pass point 11 which corresponds to the outside <br />(furthest from cliff) edge of the constructed berm. The results, for a case incorporating <br />a 10 tt high rock-wall constructed at the inner edge of the berm (file SCJ_GAPB) <br />indicate that no rocks pass this barrier. <br />Studv References: <br />SubTerra, Inc., 1994. Rockfall Hazard Assessment and Selection of Hazard Control <br />and Mitigation Measures. Prepared for Twentymile Coal Company, Oak Creek, <br />Colorado, October 7, 1994. <br />Conclusions: The results of the rockfall simulation indicate that it is unlikely that rocks <br />falling from the cliff above section J will reach the new, re-located portion of Routt <br />County Road No. 27. However, it is prudent to construct a barrier that screens off the <br />open area created. CRSP3 simulations indicate that a nominally 10-ft high wall, <br />constructed using rocks that are available adjacent to the work, will suffice. <br />Please contact me at (206)-827-8003 if you have any questions. <br />• Best Re ards <br />C ~;~..' <br />Chris D. Breeds P.E. <br />President <br /> <br />