Laserfiche WebLink
pave 2 <br />table elevation should be presented to the Division before implementation. <br />An error factor should also be determined far the predictive technique. <br />2.) All utility and municipal waste shall be placed such that at least 5 feet <br />of non-toxic cover material plus topsoil will be placed between the waste <br />and the surface. This should assure that a proper plant growth medium is <br />available. The applicant has already committed to this on page 4-93 of <br />the permit application. <br />3.) No utility or municipal waste shall be disposed of within 300 horizontal <br />feet of major reclaimed drainages or proposed ponds or impoundments. This <br />should minimize the effects of infiltrating surface waters. The major <br />reclaimed drainages of concern within this permit term are Johnson Gulch <br />and East and West No Name drainages. The applicant has already committed <br />to this on page 4-98 of the permit application. This 300 foot buffer zone <br />is in reference to the final location of the reclaimed drainages. <br />4.) No utility or municipal waste shall be disposed of within 20 feet of the <br />pit floor. Disposal this close to the pit floor could only occur where <br />the floor was expected to be dry after reclamation (see requirement no. <br />1). The reasoning behind this is as follows. Fractures, both natural <br />and blasting induced, occur in the bedrock of the pit floor. If wastes <br />were placed on the pit floor, and saturation occurred, the resultant <br />leachate could flow into the ground-water system much faster through <br />the fractures than the spoil material. Also, little attenuation would <br />occur because of the increased flow rates. <br />S.) The applicant should be more specific regarding how the 9:1 spoil to <br />waste ratio will be achieved. Specifically, this ratio should be uni- <br />form throughout the backfilled pits. This will assure that significant <br />pod concentrations do not occur. Backfilling methods should be discussed <br />in greater detail, including proposed standards for judging conformance. <br />6.) The applicant must present a plan which addresses how the waste will be <br />dealt with should the mine temporarily cease operations. If the waste <br />would continue to be disposed of in the mine pits, the applicant should <br />discuss how continued burial of the waste would be carried out. <br />M_~ <br />A map should be developed which would specifically delineate where utility and <br />municipal waste can and cannot be disposed. The map should be consistent with <br />the provisions discussed in the narrative discussion. <br />DC/ <br />cc: Dave Shelton <br />Fred Banta <br />Jim Pendleton <br />Jerry Zimpfer <br />