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,' 1RINIDAU &ASIN M1N1NG, 1NC. <br />' SEDIMENT F'UNU CERTIFICATIUIJ REF'UR1 <br />1. Sediment Fond: lv-F'2U <br />A) Comments: <br />This pond was constructed prior to September, 1984 by mine <br />personnel. Unly minor changes were needed #or <br />certification, such as installing the dewatering pipe to <br />the proper elevation and in=_talling the design cap with a <br />20 inch opening. <br />b) Design Easis for Certification: <br />Technical revision by American Engineers, Inc. dated May <br />JU, 1984. <br />C) Constructed Elevations: <br />The elevations listed below were chec4:ed with a precision <br />level and stadia rod: <br />Dewatering Pipe Inlet <br />Uewatering F'ipe Outlet <br />lop of Dam <br />bottom of Spillway <br />Toe o+ Dam <br />Hottom of Pond <br />All elevations were found to 6e within 1i. 25 feet of the <br />design. <br />D) Pottom Width of Spillway <br />Design: 2U.0 feet <br />Measured: 21.5 feet. <br />E) Riprap kequirements; <br />Design: In spillway and downstream spillway slope. <br />Measured: As in design. <br />F> Slope of Dam: <br />Design: 2.0 H 1.U V <br />Measured:<'. i~ H i . v V <br />1 <br />