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~ Y~ • <br />Mr. pavid C. Shelton <br />Mr. Tom Gillis <br />July 20, 1981 <br />Page 2 <br />Plan <br />A drainage system will be installed in the outer region of the mine bench. <br />This area is adjacent to the double red line shown on Attachment I. <br />The drainage system wi1.1 be a trench design filled with mar.eria.l that <br />would allow drainage of the mine bench area around the mine bench outslope. <br />The material used to fill the trench will provide a stable surface to allow <br />safe movement of mobile vehicles over the drain area. The routed water run- <br />off will be properly connected into the drainage system. <br />The northern portion of the trench drainage will tie into the LO inch <br />drain pipe that exists on the north edge of tl~e permit area. The southern <br />portion of the trench drainage will tie into the existing ditch. These <br />features can be seen on the sedimentaCion pond drawing included in the February <br />1981 mining and reclamation plan application now being reviewed. The general <br />location of the drain system is shown as a green line on Attachment I. Tlie <br />break in the line indicates that the drain may not be continuous due to <br />anticipated difficulty keeping the drain clean enough to be effective close <br />to the primary coal storage and loading location. <br />A final design will have drainage Co the nort}i of this break be to the <br />existing i0 inch pipeline and drainage to the south be to the. ditch system. <br />Timin <br />1. The mine sigh[ will be operational less than five years unless <br />additional coal property is obtained. Final site reclamation is <br />then essentially within the five year plan. If the mine did <br />acquire property and increase its expected life, IJestern would <br />envision several improvements on the surface facility site. <br />2. To avoid stabilization failure of the mine bench outslope in <br />next springs run-off, it is agreed that construction on the <br />drainage system will be completed by February 1, 1982. <br />3. To ensure proper design, it is agreed chat design work including <br />drain size calculations, material FpCCLf1CaCL0115, and proper <br />drawings wi1.1 he completed and submitCed to the Mined Land <br />Reclamation Board within ninety days. <br />Yours very truly, <br />~ ^ --_- <br />William S. Tate <br />WST:pas <br />cc: Bruce Collins <br />Enclosures <br />