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CASTLE ROCK <br /> CONSULTING <br /> CNfL1Nr:lNQ. r A1DMONA1 NOIi 11ONN WIM INNOV.1rK1N <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: LUMAN FIBER OPTIC 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 Luman fiber optic cable is approximately 384'from the northern mining limit,it will be not affected by <br /> mining. <br /> If you or others have any questions, please e�t�iII' . 303-947-5828. <br /> Q <br /> w/ n C7 1 Cr <br /> Stan Peters, P.E. <br /> Z'e <br /> MSCE-Structural&Geotechnical I;�Q <br /> Attachment :Slope Stability Analysis Diagram,wfth soil properties <br /> 536. A S7 2ND A VBNIIF. CASTLE ROCK, CO 80108 (303)947-5828 STANPBTERZ I'EC'CALUL.CON <br />