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III IIIIIIIIIIIIIIII <br />999 <br />,,. <br />CCrI~ 1993 <br />October 15, 1993 <br />:_~ <br />Mr. Joseph Dudash <br />Colorado Division of Minerals and Geology <br />1313 Sherman, Rm. 215 <br />Denver, CO 80203 <br />Subject: Technical Revision 31 and NOV 93-126, New Elk Mine, <br />Basin Resources, C-81-014 <br />Dear Mr. Dudash, <br />Please review the accompanying SEDCAD+ documentation for drainage <br />into the area south and east of the silos. Drainage from the 0.34 <br />acres south of D26 and east of the silo is estimated to result in <br />0.04 ac-ft of runoff and 0.55 cfs from a 10-year 24-hour storm <br />event. Drainage across the railroad tracks requires a 9" diameter <br />metal or concrete pipe with a 0.67 HW/D ratio. The berm east of <br />the pipe will need to be 0.46' high to maintain the HW/D ratio and <br />contain the flow. <br />Please do not hesitate to call if you have any questions. <br />Sincerely, <br />Catherine W. Begej ~ <br />Project Manager <br />cc Ralph Lopez, Basin Resources <br />Enclosures <br />5990 Greenwood Plaza Blvd. Suite 250 Englewood, CO 80111 <br />(303) 850-0930 Fax (303) 721-9298 <br />-- <br />