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<br /> <br /> <br />December 1986 2 863-2052 <br />a limited area of shallow overburden above the Wadge, which may <br />be removed in a truck-and-shovel operation. A detailed descrip- <br />tion of the proposed development is included in a previous report <br />(Golder, 1986). <br />In order to obtain a permit to mine, the disposal of excess spoil <br />must be designed in accordance with the regulations of the <br />Colorado Mined Land Reclamation Division (MLRD). In accordance <br />with these regulations, the spoil generated by development of the <br />box cuts is categorized as excess spoil, since it is in excess of <br />the material required to achieve the approximate original (pre- <br />mi~ing) ground-surface contours. Disposal of excess spoil is <br />regulated under Section 4.09 of the regulations. Spoil which is <br />disposed of in valleys is termed a valley fill, and is regulated <br />under Section 4.09.2 of the regulations. Regulatory requirements <br />for valley fills include all the general requirements for excess <br />spoil disposal plus additional requirements for spoil placement <br />(compaction), subsurface drainage (underdrains), and surface <br />drainage. <br />Golder Associates (Golder) assisted YVCC in the permit process by <br />performing a slope stability evaluation of the excess spoil <br />generated during development of the cuts at the Little Middle <br />Creek tract (Golder, 1986). In order to facilitate the April <br />1986 permit application, the slope stability evaluation was <br />completed without a field investigation. Instead, geotechnical <br />conditions in the Little Middle Creek tract were predicted based <br />on previous geotechnical data collected within and adjacent to <br />the tract. <br />0 <br />Golder Associates <br />