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-AWCASTLE ROCK <br /> CONSULTING <br /> [,vr�,gNs.in� TNADMIW{i $01taT uv.uvni IN,NO A!lclh <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. PROPERTY FENCES <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 northern property fences are 374'from the northern mining limit, they will not be affected by mining. <br /> If you or others have any questions, fei:lff�e�t�all me. 303-947-5828. <br /> >rQ�.;....... �. <br /> �Q f` •(R.PET <br /> Stan Peters, P.E. A ' <br /> MSCE—Structural&Geotechnical �Ftc <br /> Attachment :Slope Stability Analysis Diagram,with soil properties <br /> 53H L!A.57 2.'VD A VF..'VUF. CASTLE RUCK CO 80108 (303)947 5928 .1;T.4,VPFTERNPECGh1.91L.C0,1f <br />