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Slope Stability Analysis <br />Varra Gravel Operation - Great Western Sugar <br />Greeley, Colorado <br />Page 3 <br />approximately 0.86 was calculated. Trial and error was used to determine the <br />appropriate slope beneath the well graded gravel deposits (assumed to be the most <br />valuable commodity). A slope of 3:1 is recommended at a depth of 30 feet below grade <br />based on soil conditions encountered in the Terracon investigation. Steeper cut slopes <br />of less than 3:1 may be implemented if the apparent cohesion is greater than those <br />reported by Terracon. <br />The high permeability of the bank material reduces the potential for excessive pore <br />pressures within the bank during rapid drawdown events such as dewatering. If any <br />significant modifications to proposed slopes occur this analysis should be considered <br />invalid. <br />Comments <br />The discussions and recommendations in this report represent our professional opinions. <br />Our conclusions, opinions and recommendations are based from information available at <br />this time and we do not guarantee that undiscovered conditions will not become evident in <br />the future. CGRS' report was prepared in accordance with currently accepted engineering <br />practices at this time and location and no other warranties, representations or certifications <br />are implied or intended. <br />This report was prepared by CGRS, INC. <br />Date: February 28, 2011 <br />Joby L. Adams, P.G. <br />Principal/Hydrogeologist