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Pond 10 collects run-off from CRDA-2. The pond was dry during the inspection. <br />Volume III, Appendix 13-2, page CRDA2-1 shows its design water and sediment <br />capacities are 1.37 A-F and 1.23 A-F respectively. There are approximately 3.2-feet of <br />sediment buildup in the pond. This figure is derived from the average length of the two <br />sediment poles located in the pond minus the design depth. The percent of sediment <br />buildup is 60% (3.2' deep divided by 5.3' maximum depth). Based on this sediment <br />buildup and aerial topo maps, the pond has the following estimated capacity: <br /> Water Sediment Total <br />Pond 10 A-F 1.48 0.58 2.06 <br />Pond 11 collects run-off from Cameo Borrow Area No 2. The pond was dry during the <br />inspection. The Operator obtained approval from DRMS, (TR-47), to amend the design <br />of the pond so it relies primarily on storage to control run-off from the design event <br />(DRMS Rule 4.05.9(2)(e)). Therefore, the open channel primary spillway was no longer <br />required and it was backfilled during late October 2005. The design event the pond <br />must contain is the 25-year event which generates 0.47 A-F of sediment and 0.66 A-F <br />of run-off for a total required pond capacity of 1.13 A-F. During 2006 the pond received <br />a substantial amount of sediment from an overflow of Coal Gulch. The estimated <br />capacity of the pond was reduced from 5.7 A-F to 3.5 A-F. The pond is still significantly <br />oversized for both sediment and water capacity. <br />Pond 13 collects run-off from the reclaimed north portal. The pond was dry during the <br />inspection. Volume V, Appendix 14-6, pages 14-6-58 and 60 show that its design water <br />and sediment capacities are 0.80 A-F and 0.31 A-F respectively. There are <br />approximately 0.2'of sediment buildup in the pond. This figure is derived from the <br />length of the sediment pole located in the pond minus the design depth. The percent of <br />sediment buildup is 10% (0.2' deep divided by 2.0' maximum depth). Based on this <br />sediment buildup and aerial topo maps, the pond has the following estimated capacity: <br /> Water Sediment Total <br />Pond 13 A-F 0.80 0.28 1.08 <br />The CBA-1 non-discharging sump collects run-off from Cameo Borrow Area No. 1. <br />The sump was dry during the inspection. During 2006 the pond received a substantial <br />amount of sediment from an overflow of Coal Gulch. Sediment removal was completed <br />on March 19, 2007. The sump has a depth of 3.9 feet. CBA-1 sump has the following <br />estimated capacity which is also Mr. Reschke's certified capacity. <br /> Water Sediment Total <br />CBA-1 Sump A-F 0.18 0.04 0.22 <br />-3- <br />