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<br />E.8. Comment <br />Please provide the staff with a detailed description of <br />the energy dissipation structures to be placed on top of the <br />waste dumps where naturally occurring drainage channels join <br />the waste dump. Please show their placement on an appropriately <br />detailed map. <br />Cotter Response <br />Please see Cotter response to MLRD Comment E-6. <br />E.9. Comment <br />Please describe in greater detail the "dry seal" process <br />of sealing adits which will not receive a Gunite seal. <br />Cotter Response <br />Cotter intends to employ two types of dry seal methods <br />on the secondary adits. The first method will consist of <br />caving the adit, and blasting, if necessary. The adit and <br />area above the adit will be covered with soil and revegetated. <br />The second method will employ the construction of a cinder <br />block wall. Footings, wider than the width of cinder blocks, <br />will be poured using concrete. Cinder blocks will be stacked <br />the height of the adit. Q/BOnfi= (a mixture of fine concrete <br />and fiberglass) will be used to seal the cinder blocks. If <br />extra strength is needed, concrete will be used to seal all <br />air spaces within the cinder blocks. <br />E.10_ Comment: <br />Please describe in greater detail how the ventilation <br />shafts will be sealed with a concrete plug. <br />Cotter Response <br />The text of the amendment application is being revised <br />and a drawing is being prepared that will describe in more <br />-10- <br />