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TRINIDAD BASIN MINING, 1NC. <br />SEDIMENT FOND CEkTIFICAIlON REF'ORl <br />6. Sediment Pond: 15-F'2 <br />A) Comments: <br />This pond was greatly expanded so that all the ponds in the <br />Pit 2 drainage could be eliminated. The dam was rewor{;ed <br />and expanded and a new spillway was installed at a higher <br />elevation. <br />B) Design Basis #or Certification; <br />Revision to Surface Hydrology Lesigns submitted 6y Panorama <br />Resource Services, Inc. on October 29, 1984. <br />C) Constructed Elevations: <br />The elevations listed below were chec{;ed with a precision <br />level and stadia rod: <br />Dewatering Pipe Inlet <br />Dewatering F'ipe Outlet <br />Top of Dam <br />Bottom of Spillway <br />Toe of Dam <br />Bottom of Fond <br />All elevations were found to be within U.20 feet of the <br />design. <br />D) Bottom Width of 5pillwav <br />Design: 21.0 feet <br />Measured: 21.0 feet. <br />E) Riprap kequirements: <br />Design: Placement of ]ti-12 inches of riprap in spillway <br />channel and downstream side. <br />Measured: As designed. <br />F) Slope of Dam: <br />Design: 2.0 H 1.0 V ma>:. <br />Measured: 2.0 H 1.0 V max. <br />16 <br />