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r <br />Wildlife use is also extensive on Pond A. Observation reveal that <br />more than 15 species of water fowl are using Pond A. Six to twelve <br />broods of ducks are raised on the pond each year. In addition elk, <br />deer, small mammals, numerous other migratory birds, reptiles, <br />amphibians, fish and many invertebrates use the pond. The size and <br />shape of the pond with the large amount of aquatic vegetation <br />provides valuable aquatic habitat. <br />Three permanent five horsepower aerators will be installed in Pond <br />A to aid in the return of the pond to an aerobic state from the <br />anaerobic condition that occurs during the winter months when an <br />ice cover is present on the pond. Location of the aerators is <br />shown on Figure 35a. Power for the aerators will be supplied from <br />the pumphouse built for the Twentymile Coal Company preparation <br />plant. <br />For Pond A, a stability investigation analysis have been performed. <br />The analysis is described in the plans and includes strength <br />parameters, pore pressures, long term seepage conditions, <br />description of engineering design assumptions and calculations. <br />Also presented is a discussion of each alternative considered in <br />selecting the specific design parameters and construction methods. <br />Identical stability investigations are currently in progress for <br />ponds <br />MR94-81 780-213 (b) Revised 11/09/94 <br />