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8/12/2020 <br />State. co. us Executive Branch Mail - Fwd: Your Trapper PR10 Qs <br />For foundation prep for the temp spoil, Trapper will grub and conserve the topsoil. The area proposed is a dry swale <br />currently vegetated with Artemisia tridentata. So, it's a low, gently sloping V shape. <br />For minimizing erosion and covering the pile Trapper would aerially seed it. There will as well, be a plethora of <br />volunteers for better or worse. Also, they will be driving over it as material is placed, and thereby somewhat <br />compacting the pile. What I find out there is that precipitation usually creates a thin crust over the surface that reduces <br />friability wrt wind. <br />These items are not called out in their permit for this type of "structure" as they have only recently utilized a temp spoil <br />pile. In the adequacy we can always ask them to add language explaining their practices, the geography, etc. If, for <br />your stability analysis you need a range of values for variables let's get those questions to them. <br />LMK if this helps or you have additional questions. <br />Robin Reilley, M.S. GISP <br />Environmental Protection Specialist II <br />COLORADO <br />Division of Reclamation, <br />Mining and Safety <br />Department of Natural R- <br />-- <br />P 303.866.3567 ext 8105 Cell 303.906.3886 <br />F 303.832.8106 <br />1313 Sherman Street St., Suite 215, Denver, CO 80203 <br />robin.reilley@state.co.us http://mining.state.co.us <br />Trapper PR10 Geotech Review Memo 20200710.docx <br />156K <br />https:Hmail.googIe.com/mail/b/ALGkdOxdukgIOCQ2OeloaPmgfsan5gKgiALi80wboy6C-ZDitSHz/u/0?ik=deb7fOcd20&view=pt&search=all&permthid=th... 2/2 <br />