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II I I II I II I II IIII III <br /> 999 <br /> STATE OF COLORADO <br /> DIVISION OF MINERALS AND GEOLOGY Of oo� <br /> Department of Natural Resources <br /> 1313 Sherman St.,Room 215 <br /> Denver,CO 80203 �7/]�+X•_ 74 o o « * <br /> Phone:(303)866-3567 ' �1 `JR76" <br /> FAX:(303)832-8106 - �� ��SB <br /> Rov Romer <br /> G�0-✓� Governor <br /> •�1 Michael B.Long <br /> November 22, 1995 Die)v <br /> V Division Director <br /> Mr. Larr Perino PIJ, � OF <br /> y oc F/ C/CE <br /> Superintendent-Technical Services k'e-'R Le C <br /> Sunnyside Gold Corporation ,j'/�-�• �9,, ®Py <br /> P.0 Box 177 �e <br /> Silverton, CO 81433 • �v J � <br /> RE: TR-18, Upland Diversion for American Tunnel, Approval, <br /> Sunnyside Mine, Permit No. M-77-378. <br /> Dear Mr. Perino: <br /> This letter is to inform you that DMG has completed its review of TR-18, request for <br /> installation of an upland diversion to route shallow subsurface flows around a portion of <br /> the American Tunnel facilities area. The intent of the shallow gravel/pipe drain is to <br /> reduce the amount of flow passing through the fill material deposited within the permit <br /> area. Upland diversions for fill areas generally enhance the stability of the fill material <br /> and help minimize disturbances to the prevailing hydrologic balance by minimizing <br /> drainage from the affected areas. On 1 1/22/95, DMG approved TR-18. <br /> The plan submitted for the gravel/pipe drain states that the drain will extend for <br /> approximately 1000' at 4% grade along the east side of the permit area. Although the <br /> quantity of flow intercepted by the drain is unknown at this time, the plan anticipates <br /> the quantity of flow within the drain to be approximately 10-50 gpm, depending upon <br /> seasonal fluctuations. The submitted plan indicates that discharge from the drain will be <br /> conveyed to the South Fork of Cement Creek via an existing road side drainage ditch. <br /> Should SGC elect to implement the plans approved in TR-18, the existing road side <br /> drainage ditch may require enlargement to convey the additional flow. Energy <br /> dissipating structures may also prove necessary to control erosion within the existing <br /> road side ditch, once the quantity and velocity of flow is determined. <br /> Please contact me at the DMG field office in Durango, 1474 Main Avenue, Room 207, <br /> Durango, CO 81301-5182, phone (970) 247-5062, should you have any questions. <br /> Sincerely, <br /> Wallace H. Erickson <br /> Environmental Protection Specialist <br />