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CASTLE ROCK <br /> .AbCONSULTING <br /> 1'MIANCI., J TrtAlltrit).NAi.SOLUTION.Milt INNO Ar IoN <br /> Fremont Paving and Redi-Mix March 13, 2023 <br /> 839 MacKenzie Avenue <br /> Canon City,CO 81215 <br /> Via email <br /> Attn : John Young <br /> RE : Permanent Man-Made Structures:CENTURY LINK CABLE <br /> Kiowa County Gravel Pit,CO <br /> As requested, a slope stability analysis was prepared for the subject mining project,"that demonstrates that such <br /> structure shall not be damaged by activities occurring at the mining operation", per Colorado's Division of <br /> Reclamation, Mining and Safety regulations. <br /> The analysis was performed at the proposed 50' mining limit south of the high-voltage power lines,which parallels <br /> Highway 96 east to west. Depths of the deposit are from recent test pits and the depth from an upstream water <br /> well in the creek bed;typical soil properties were used. These poles are typically 45'tall,bedded to a depth of <br /> approximately 7' below grade. <br /> Mining depth used was at a maximum of 20' below existing grade;intended mining will stay above the natural <br /> groundwater at all times. Several iterations through the software showed that if a 2:1 excavation slope was <br /> maintained at the northern mining limit,a factor of safety against slope instability of 1.66 was obtained, <br /> preventing any damage to the power poles. <br /> Since the Century Link cable is 542'from the northern mining limit, it will be not affected by mining. <br /> If you or others have any questions, pleas Peet.rb�46 call.me. 303-947-5828. <br /> Stan Peters, P.E. <br /> MSCE—Structural &Geotechnical .ti F <br /> �."SS r^;Ja <br /> Attachment:Slope Stability Analysis Diagram,with soil properties <br /> 536 ff'AS7-2, D A 47D'VL,E CASTLE ROCK, CO 801 n8 (,9OX 947-.6828 STANPETfsXSf'E9GRL4&COA-f <br />