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Slope Stability Analysis <br />Raptor Pit 125 <br />Weld County, Colorado <br />Page 3 <br /> <br /> <br />achieved for a uniform slope of 1.25H:1V at a bank height of 23 feet – this safety factor is <br />contingent on the lower sand and gravel deposits having a friction angle of 38 degrees. <br />This scenario is depicted on Plate 1 in Attachment C. Model results indicate that using a <br />lower bank slope (20 feet) of 3H:1V will result in safety factors of greater than 1.3 at a bank <br />height of 50 feet. This scenario is depicted on Plate 2. Using the different wet unit weights <br />reported in Table 1, resulted in safety factor differences of less than 2 percent. If any <br />significant modifications to proposed pit wall slopes occur this analysis may not be <br />representative of site conditions and additional simulations are recommended. <br /> <br />Comments <br />The discussions and recommendations in this report represent our professional opinions. Our <br />conclusions, opinions and recommendations are based from information available at this time <br />and we do not guarantee that undiscovered conditions will not become evident in the future. <br />AWES' report was prepared in accordance with currently accepted engineering practices at <br />this time and location and no other warranties, representations or certifications are implied or <br />intended. <br /> <br /> <br />This report was prepared by AWES, LLC. <br /> <br />Date: October 11, 2024 <br /> <br />Joby L. Adams, P.G. <br />Principal/Hydrogeologist