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1 <br />' The principal items of mining equipment remain essentially unchanged: <br />' Scrapers will be used for topsoil and overburden removal and for medium <br />distance transport of aggregate, dozers for aggregate pushing, front end <br />' loaders for short transport of aggregate and for loading scrapers, and trucks <br />' and over the road trucks for delivery to off site projects. A water truck <br />will be employed as appropriate for dust abatement, a grader for road <br />maintenance and other miscellaneous service, fuel and utility type vehicles <br />for transport of materials. <br />' The amendment calls for water to be diverted in a ditch around unit 4 to <br />minimize buildup of moisture in the aggregate which has caused some difficulty <br />1 meeting specifications for concrete aggregate in the initial phases of the <br />' mining program. The sedimentation ponds were moved to a portion of the <br />previously mined flat terrain south of the plant site from the bed of Lone <br />' Tree Creek in a recent Technical Revision (October 1980). <br />The average thickness of the aggregate and the overburden is indicated by <br />the test pit information included in the original 112 application. The pit <br />numbers correspond to locations on the premining map. <br />The aggregate is described in the Colorado Geological Survey Document <br />' cited above in the section on Geology. The mining plan from the map has been <br />based on the assumption that the aggregate weight is 3,000 pounds ,per cubic <br />' yard. This has been increased slightly from the original application based on <br />' its moisture content. Mining unit 1 is currently being mined to satisfy <br />contracts for C-33 concrete sand, 3 inch minus rip rap, and class 2 filter <br />rock. Unit 2 is to be mined between now and the end of 1980 primarily for <br />class 6 road base. Mining unit 3 is currently covered with sand previously <br />' generated by another operation and will be mined by the end of 1980 if the <br />' stockpiled sand can be marketed. The mining of unit 3 may supplement any of <br />the materials contracts currently anticipated. <br />1 <br />