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Ms. Kim Wolf <br />May 23, 2002 <br />Page 2 of 2 <br />drainage azea in terms of the design flood calculations (24.4 acres out of a total <br />drainage area of 718.1 acres). <br />3. Prospect Pond (007) Watershed. The post-mining stock ponds in this watershed <br />include Pond G, Pond J and Pond K, which have a combined capacity of 1.57 ac- <br />ft. These aze mostly incised ponds that intercept an insignificant amount of <br />drainage azea in terms of the design flood calculations (22.7 acres out of a total <br />drainage azea of 712.5 acres). <br />4. Section 16 Pond (009) Watershed. The post-mining stock ponds within this <br />watershed include Pond H and Pond I, which have a combined capacity of only <br />0.32 ac-ft. These mostly incised ponds intercept an insignificant amount of <br />drainage azea in terms of the design flood calculations (11.3 acres out of a total <br />drainage azea of 265.5 acres). <br />After reviewing the locations and contributions of the post-mining stock ponds in their <br />respective watersheds, they were not considered in the watershed analysis. These post-mining <br />stock ponds all have small capacities relative to the sediment control pond for their respective <br />drainage basin and are not located along ditch systems or drainages which would collect <br />additional runoff. Embankment failure on any or all of these small ponds would release only a <br />portion of the stored water, and the amount of water released would be insignificant with respect <br />to the spillway and freeboazd design floods for the sediment control ponds. <br />If you have any questions or continents regarding this,rtfatCe~, please contact me at (307) <br />742-0031 or Doyl Fritz at (307) 672-0761. ~ <br />Sincerely, <br />Colorado P.E. 35009 <br />Project Engineer <br />SL:sb <br />cc: Dale Brown <br />File: 99-642 <br />W <br />WC Engineering <br />