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,41s. Sandra L. Bro ~•n <br />© Colorado Di~uision of A9inerals & Geo/ogy <br />December 23, 1998 <br />Page 4 <br />• Shop/Utility Building Slab - 3,770 fr (to be retained for planned postmining land <br />use, see response to comment 8) <br />• Crusher/Breaker Building Slab (Surface portion removed to depth of 3-feet) - <br />950 h' <br />• Baghouse Slab - 188 fr <br />• Switch House Slab - 100 h' <br />Eliminating the Shop/Utility Building Slab and assuming an average slab thickness of 6- <br />inches and a material swell factor of 50 percent, the total volume of concrete demolition <br />debris to be disposed of in the Tipple Area would be approximately 40 cubic yards. The <br />sub-grade portion of the crusher building, which is approximately 6 feet deep, provides <br />roughly 12,000 cubic feet (450 cubic yards) of volume capacity, assuming a 4-foot placement <br />thickness and using the mapped building footprint from Map 29, Kerr Tipple Area Exis[ing <br />Structures. Using the stated volumes, the placement thickness of concrete demolition debris <br />would be less than 1 foot. <br />2J On revised page 63a in the TR application, it says that a minimum of four feet of suitable <br />cover material will be placed over the crasher bzilding. Where will the material come from <br />and will it he suitable as a plant growth medium? <br />Response: Aher reviewing the applicable regulatory requirements as outlined under Rule <br />4.11.4 and recognizing the limited area, topographic relief, and material availability in the <br />tipple area, Kerr has modified the proposed reclamation plans (tipple area only) to reflect <br />placement of a minimum of ?feet of cover material over the crusher building disposal area. <br />This material will come from the existing tipple truck ramp (approximately 2,000 ydss of <br />clean fill material) and overall site grading, with supplemental borrow, if required, from the <br />higher portion of the tipple area adjacent to the toe of the hillslope on the northeast side. <br />Regrading activities will focus on elimination of any depressions that could retain water, <br />reestablishment of effective drainage off the area, and blending of disturbance areas with the <br />surrounding terrain. Suitability of surficial and cover materials in the tipple area is addressed <br />in the permit in Section 780.18(h) (pgs 780-64 through 780-65ee) and will be verified by the <br />reclamation suitability testing plan outlined on pages 780-70aaa through 780-70aaaaR. <br />3J There is a concrete warehouse/o~ce structure near the northwest part of the tipple facility <br />area. What are the plans for this strtzctzzre? <br />Response: A[ this time, Kerr is proposing to retain the shop/u[ility building as a permanent <br />structure in conjunction with the proposed postmining land use (refer to TR-19, Kerr Mid- <br />Term Review Responses and accompanying permit revisions). <br />r~ ~xvvm ia~x~ro.~~ e~ <br />i ~i: vrs roc <br />