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.,' ;,v <br />v <br />-~' <br />June 23, 1984 <br />• MINCON INC., P.C. <br />5504 Jefferson Ave. <br />Denver, Colorado 80237 <br />(303)753-1729 <br />(303)758-3706 <br />b;r. George M. L. Robinson <br />rr^ox Consultants Inc, <br />X10 Kipling Street <br />Suite 400 <br />Denver, Colorado 8021$ <br />Dear idr. Robinson: <br />III'I~~I~~I~~~~~ II~ <br />sss <br />ya`- ,4 "mac <br />4 <br />JUR1~S' <br />RECEIVED <br />FOX <br />rer our phone conversations during the week of I~Yay 14th, h~incon <br />Inc., P. C. is pleased to provide professional services to verify <br />the construction of the sedimentation pond at the O.C. No. 2 Mine. <br />Pond design criteria has been supplied by Fox Consultants and is <br />based on the Gingery Associates Inc.'s report dated July 16, 1930. <br />On I~',ay 21st, a site visit was made by Pdr. William Balaz, ?dincon, <br />accompanied by t4;r. Bob ~;eaver, O.C. Ido. 2 Mine Foreman. The <br />dimensions of the constructed pond were measured and compared to <br />the Gingery Associates' design specifications. The results are: <br />1.) The pcnd is b~iilt on the hillside as designed, but may be <br />slightly lower in elevation. This is based on a calculated <br />top of berm elevation of 9080 (by altimeter) compared to <br />a design elevation of 9139.5• This appears to have been <br />done to facilitate construction by minimizing the cut <br />required and to locate the pond on a flatter slope. <br />2.) The pond is constructed to approximate design dimensions <br />as shoe;n in the Appendix, <br />3.) The pond slopes approximate the required 2:1 and 3:1 <br />grades. Calculations and comments based on field observa- <br />tions are included in the Appendix. <br />