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1R1NIllAD bAS1N MLN1N6, 11JC. <br />SEDIMEIJT FOND CEkT1F1CHTION REFOFI <br />4. Sediment Fond: 15-F'30 <br />A) Comments: <br />This pond was originally constructed prior to September, <br />1964 by mine personnel. Fond volume, as constructed, <br />significantly er.ceeded the design volume. Wort: for <br />certification involved installation of a riser section to <br />the dewatering pipe, installation of a cap with a 2 inch <br />opening and addition of more riprap to the spillway <br />channel. <br />b) Design basis for Certification: <br />Technical revision by Hmerican Engineers, Inc. dated Ftay <br />30, 1984. <br />C) Constructed Elevations: <br />The elevations listed below were checked with a precision <br />level and stadia rod: <br />Lewatering F'ipe Inlet <br />Dewatering F'ipe Outlet <br />Top of Dam <br />Bottom e4 Spillway <br />Toe of Uam <br />bottom of Fond <br />Since the actual pond volume er.ceeded the design, elevations <br />are not e::actly as in the design: however, they are more than <br />adequate for pond certification. <br />D) bottom Width of Spillway <br />Design: 15.Cr feet <br />Measured: 15. i~ feet . <br />E) kiprap kequlrements: <br />Design: Placement in spillo-+ay channel and on downstream <br />side. <br />Measured: As designed. <br />10 <br />