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the fence is 1.72. The factor of safety is determined by dividing the forces within the soil mass <br />that resist failure (weight and friction) by the forces that tent to cause the slope to fail (gravity <br />and a steep cut face). A safety factor of less than 1.0 indicates an impending failure while a <br />value of greater than 1.0 is theoretically stable. Common engineering practice typically <br />prescribes the use of safety factors of l .3 for temporary construction embankments while a safety <br />factor of 1.5 is typically used for permanent conditions. <br />Based on the above referenced analysis, observations, tests, and £mdings, it is our opinion that <br />the fence structures along the east and west property lines of the Corey Pit #3 will not be <br />damaged by the mining operation and/or its reclamation. <br />Yours truly, <br />Thomas E. Gri <br />Enclosures: <br />Coroy Gravel Pit #3 <br />Project 2003-470 <br />Page 2 of 2 <br />Atterberg Limits <br />