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Drainage and Sediment Control <br />The drainage and sediment control system for the Elk Creek mine gob vent boreholes will be <br />consistent with the previously constructed Sanborn Creek Mine gob vent boreholes. The <br />drainage and sediment control for the Elk Creek Mine borehole sites will be managed as a small <br />azea exemption with alternative sediment control provided by a combination of perimeter <br />sediment control berms/ditches and installation of straw bales, straw waddles or silt fence, etc. to <br />reduce flow velocity and trap sediment. To facilitate the control of upland drainage, if the site is <br />suitable, an upland clean water diversion will be constructed to reduce overland flow into the <br />effected azea. Permit Map 2.05-M4 (4~' sheet) Drainage and Sediment Control Plan provides a <br />typical example of a drill pad lay out. Exhibit 2.05-E3, Drainage and Sediment Control Plan, <br />Section 9, Revised and New SAE's and Alternative Sediment Controls provides typical designs <br />and demonstrations for alternative sediment control and clean water ditch scenarios. Exhibit <br />2.05-E3, Drainage and Sediment Control Plan, Section 6 contains information regazding mudpit <br />hydrology demonstrations. <br />Bonding/ Reclamation Cost Estimate Considerations <br />The anticipated additional road disturbance for access to the GVB-LW12-O1 is 1,325' by 10 - 16 <br />feet wide or a total of 0.49 acres of additional disturbance. The pads will be approximately 80 <br />feet wide and 130 feet long or 0.24 acre each. Total pad disturbance will be approximately 0.96 <br />acres. Total additional acreage is 1.45 acres and borehole footage is estimated to be 7,630'. <br />As in the past, we are requesting that the Division prepare a cost estimate to complete the total of <br />1.45 acres of reclamation activities. We would like to stress that the boreholes will have the 9 <br />5/8" casing cemented in place and there will be no reason to mobilized drilling equipment to <br />ream out the borehole. Consideration for down hole reclamation should only include plugging <br />the casing and sealing with cement using a standard redi-mix concrete truck. <br />Attached please find a proposed public notice which will be published in the Delta County <br />Independent upon notification by the Division that this application is complete. Please contact <br />me at 970-929-5806 if I can provide any additional information or if you have any questions. <br />Sincerely, ~ ~/~ <br />~r <br />J es A. Kiger <br />nvironmental Manager <br />Enclosures <br />Xc: Jim Cooper (OMLLC) <br />Gunnison County Planning Office <br />David Rice, Delta County Planning <br />Paonia Public Library <br />USFS, Paonia Ranger District <br />BLM,UFO <br />Files <br />• Page 3 <br />