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• • <br /> Mr. & Mrs. Combs 2 November 5, 1996 <br /> Howardsville Mill Permit No. M-84-049 <br /> Adequacy Issues, TR-05 <br /> its contributions. Please clarify. <br /> WIND EROSION CONTROL PLAN - The wind erosion control plan, submitted under TR-05, <br /> includes establishment of protective vegetative cover for tailings pond embankments and <br /> controlling wind transport of tailings by maintaining moist conditions on tailings surface. <br /> Slatted fence, brush cuttings, and topographic barriers will also be utilized to reduce wind <br /> velocity across non-vegetated tailings areas. DMG approves the portion of TR-05 <br /> addressing wind erosion control, dated 10/3/96. <br /> CONTAINMENT PLAN - DMG is awaiting submittal of the following items addressed in <br /> the Containment Plan, submitted under TR-05: <br /> results of material analysis and compaction testing of the ore stockpile pad; and <br /> demonstration of appropriate sealing of tailings pond. <br /> Operator has submitted results of water analysis taken from the Mill Drain Pond monitor <br /> well on 10/4/96. Water analysis indicate the presence of cyanide, even though cyanide <br /> has not been approved to be utilized in the Mill Building. Water analysis from the Mill <br /> Drain Pond monitor well indicate that inert material may not have been utilized as the <br /> sand layer between the upper and lower liners and/or possible leakage of the upper liner. <br /> The relatively long recharge time (1 week) for the monitor well, following well evacuation, <br /> may indicate low permeability of the sand layer. Low permeability of the sand layer may <br /> result in excessive hydrostatic pressure on the lower liner. DMG will continue its review <br /> of the Mill Drain Pond and will request additional information, if required. for DMG <br /> approval of this environment protection structure. <br /> Please contact me at the DMG field office in Durango, 484 Turner Drive, Building F, Suite <br /> 101 , Durango, CO 81301 , phone (970) 247-5193, if you have any questions. <br /> Sincerely, <br /> Wallace H. Erickson <br /> Environmental Protection Specialist <br /> Enclosure(s) <br /> cc: Michael Savage, Savage & Savage <br /> Joe Baldwin <br />