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EncE c. WFFITE P.E. ~ III IIIIIIIIIIIII III <br />1650 M. STREET PENROSE, COLORADO 81240 719-372-6461 <br />RECEIVED <br />August 14, 1992 <br />aus i 7 ~ss2 <br />Catherine W. Bege j DIVISION Or <br />Reclamation Specialist MINERALS & GEOLOGY <br />Division of Minerals ZL Geology <br />1313 Sherman Street <br />Denver, Colorado 80203 <br />RE: Twin Pines No. 2 Mine, C-83-OSB; Mine Site Drainage; your <br />Letter of July 23, 1992; N.O.V. No. 92-0 ~, dated 7/16/92 <br />Dear Catherine: <br />In accord with your letter of July 23, 1992 and the Notice of <br />Violation, served July 16, 1992 I have reviewed the road drainage <br />design set forth in the Permit Application, (Please note that the <br />hydraulic capacity of the road to the North Spoil Area was <br />checked and discussed during the permit renewal in 1990. My <br />letter of February 8, 1990 to Mr. Larry Routten included <br />calculations of the hydraulic capacity of the road. Appropriate <br />sections of the Permit Application were not revised to reflect <br />the existing characteristics of the road>. Resulting from my <br />review of the present site drainage and several studies of site <br />run-off, presented under the Technical Revision for emergency <br />spillways, I have revised Drawing No. TP-3, "Mine Site Plan" to <br />include Typical Road Sections. The revised Map is enclosed. <br />Included with the Sections are the Flow Depth and velocity for <br />each Typical Section for the 10 year Storm Event. Pages 80a, 806, <br />and BOc should be deleted from the Permit Application. Page 72, <br />73, &, 74 are being revised to reflect the current site drainage. <br />To maintain compliance and impede continued erosion, the Access <br />Road from the truck loading area to the Mine Site will require <br />some repair work. The other site roads and drainage facilities <br />are satisfactory in their present condition for the intended use. <br />If you have any questions, please advise. <br />Sincer `~`~/~'(/ <br />~'s'l/x1YGC <br />Lawrence White P.E. <br />xc: Twin Pines Investment w/ enclosures <br />1 <br />