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• Embankment Crest Width: 5 feet <br />• Downstream Slope Height: 9 feet <br />• Downstream Slope Angle: 2H:1 V <br />• Upstream Slope Height: 8 feet <br />• Upstream Slope Angle: 2H:1 V <br />• Height from Spillway Invert to Upstream Slope Toe: 5 feet <br />This geometry is illustrated by the SLOPE/W output shown on attached Figure 13- <br />11.1, Stock Tank Stability.. <br />The embankments will be constructed from spoil material produced during mining. <br />This material is placed in controlled lifts and compacted. Based on this fact, <br />observations of the on-site spoil piles, and typical strength values for spoil material, <br />the following strength properties were assigned to the embankment. <br />• Spoil: 0 = 38°, cohesion = 0 psi <br />• Unit Weight: 120 pcf <br />Based on the above stated assumptions, safety factor of 1'.56 was calculated by <br />the limit equilibrium analysis. Rule 4.05.918)Ib) states that the stockponds require a <br />safety factor of 1.3. Therefore, these structures should perform adequately during <br />the life of mine. In addition, stockponds will be located so that there are no <br />potential safety hazards to downstream structures; therefore, if a failure did occur, <br />• there would be minimal risk to life and property. <br />SUMMARY <br />After completion, an as-built report will be prepared and certified for each stock <br />tanks constructed and submitted to the Division. Upon final reclamation, if a stock <br />tank is to remain as a permanent structure, the appropriate application forms for <br />stock water tanks will be filed with the Colorado Office of the State Engineer and <br />forwarded to the Division for approval. <br />The Colorado Office of the State Engineer was contacted regarding jurisdiction of <br />permanent stock water ponds. According to the Division Engineer and as stated in <br />Section 35-49-10712) CSR, any dams that are less than five feet high and impound <br />less than two acre-feet of water would not fall under their jurisdiction. <br />u <br />2 <br />