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C <br />MINCON INC., P.C. <br />5504 Jefferson Ave. <br />Denver, Colorado 80237 <br />(303)753-1729 <br />(303) 758-3706 <br />May 28, 1984 <br />~ III IIIIIIIIIIIIIIII <br />RECEIVED <br />JUL 18 1984 <br />Mr. George M.L. Robinson <br />Fox Consultants Inc. <br />710 Kipling <br />Lakewood, Colorado 80226 <br />Dear Dir. Robinson: <br />MINED UIND RECLAMA110N DIVISION <br />Colo. Dept of Natural Resources <br />Per our phone conversations during the week of May 14th, Mincon <br />Inc. P.C. is pleased to provide professional services to verify <br />the construction of the sedimentation pond at the O.C. :~o. 2 i,:ine. <br />2ond design criteria has been supplied by Fox Consultants and is <br />based on the Gingery Associates Inc.'s report dated July 16, 1980. <br />On May 21st, a site visit was made by N,r. William Balaz, Mincon, <br />accompanied by Mr. Bob Weaver, O.C. No. 2 Mine Foreman. The <br />dimensions of the constructed pond were measured and compared tc <br />the Gingery Associates' design specifications. The results are: <br />1.) The pond is built in the approximate location on the <br />hillside as shown but may be slightly lower in elevation. <br />This is based on a calculated top of berm elevation of <br />9030 (by altimeter) compared to a design elevation of <br />9139.5• This appears to have been done to facilitate <br />construction by minimizing the cut required and to <br />locate the pond on a flatter slope. <br />2.) The pond is constructed to approximate design dimensions <br />as shown in the Appendix. <br />3.) The pond slopes appear to approximate the required 2s1 <br />and 3:1 grades. Calculations and comments based on field <br />observations are included in the A ppendix. <br /> <br />