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The construction of this pond will require a certain amount of excavation in the <br />pond area as sufficient capacity could not be obtained otherwise with a low embankment <br />due to the steep gradient of the Taylor Gulch tributary. Detailed data on the pond is <br />listed in Tables 7 and 8. <br />Streeter Gulch Sedimentation Pond <br />This pond illustrated on Figure 9 is constructed on Streeter Gulch near its mouth. <br />Its purpose is for sedimentation of the runoff from the Streeter Gulch mine fi II area. <br />The pond has been checked for conformity with the Board's regulations and with <br />certain recommended work will comply with the regulations. The recommended work <br />consists of several items as follows: <br />1. The principal spillway consisting of a 24" outlet pipe with a 24" riser <br />needs a flow restrictor in order to provide sufficient detention time for <br />sedimentation. The recommended flow restrictor is an orifice plate with <br />a 13" diameter opening which is to be placed over the 24" pipe riser. <br />• 2. The emergency spillway elevation needs about 2 feet of raising so that <br />the full useable capacity of the pond can be used for flood detention <br />for sedimentation, and the emergency spillway is to be riprapped to <br />be safe against erosion for the spillway design tloaa. <br />3. A low area of the completed embankment needs to be filled in to bring <br />all the completed embankment up to the established top elevation. <br />When these recommendations are carried out, the Streeter Gulch sedimentation pond <br />will fully comply with the Board's recommendations with a considerable margin of safety. <br />Detailed data on the pond reflecting these recommendations is listed in Tables 7 and 8. <br />Gulch A Sedimentation Pond <br />This pond illustrated on Figure 10 is proposed for construction in the summer of <br />1982 in order to be ready for collecting drainage from the Section 11 area scheduled for <br />mining following that date. <br />8 <br />