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<br />ii i iiiiu i iiiiii iii <br />999 <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />1313 Sherman St., Room ? 15 <br />Denver, CO v0?03 <br />Phone: U03) R6F,-3567 <br />FAX:IloJl BJ'~tll U6 <br />DATE: April 07, 1993 <br />MEMO <br />TO: Janet Binns <br />FROM: Susan Morrison ~ti4~~~ <br />RE: Deserado Mine (C-81-018) <br />Technical Revision 31 <br />of cow <br />R~ _ -0 <br />~~~~ <br />n <br />.~1~. <br />.t <br />/¢'!e <br />Roy Romer <br />Goremor <br />.Michael B. Lung <br />Division Direuor <br />Following are my concerns and requests after an adequacy review of WFU's response to my <br />memo of February 24, 1993. I requested these items in a telephone conversation with Dave <br />Anderson of WFU on March 24, 1993. <br />1. In order to verify the volume of the pond, we are still in need of a detailed topographic <br />map or drawing of the pond as it will be constructed. <br />2. WFU included a commitment to certify, upon completion of construction, that the pond <br />was constructed as designed. In order to accomplish this, a detailed design should first <br />be submitted, again, in the form of a detailed topographic drawing. <br />3. The "SDH #4 Discharge Layout" submitted by WFU shows the top of the SDH#4 pond <br />embankment at 5410'. Map 141, submitted with the topographic drawing, shows the top <br />of the embankment at 5412'. The discharge layout drawing shows the pond bottom <br />somewhere between 5410' and 5420', Map 141 shows a bottom elevation of 5407'. <br />WFU should revise one or both of these drawings to accurately reflect the proposed <br />design. <br />4. The scales shown on the drawings which are printed on 8L/z" X 11" paper do not <br />coincide with the written scales. Please have WFU correct these discrepancies. <br />5. Map 141 shows rip rap on the slope below the primary discharge pipe. WFU should <br />include details on sizing of the rip rap, and what inputs were used to determine sizing. <br />