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PERMFILE64182
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PERMFILE64182
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Entry Properties
Last modified
8/24/2016 11:10:10 PM
Creation date
11/20/2007 8:18:58 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1992080A
IBM Index Class Name
Permit File
Doc Date
10/9/2002
Section_Exhibit Name
Section 2.05 Operation and Reclamation Plan
Media Type
D
Archive
Yes
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subject to revision in the future based upon more accurate data. Should the actual swell <br />factor be significantly greater or less than the current estimated, then the mine and <br />reclamation plans will be amended and submitted to the Division. The profile survey will <br />be conducted on an annual basis, when mining resumes. <br />Prior to placement of material in the permanently reclaimed spoils azea (box cut spoil}, and <br />after the removal of soft materials, the applicant placed a sandstone underdrain in the <br />bottom of the spoil. The size of the underdrain was as designed with no less than 15 feet <br />of sandstone, more than 2 feet in diameter, and had the following approximate size <br />distributions which were confirmed during placement: <br />2' - 1': 40% <br />4"-0:15% <br />As described in the hydrologic section, the sandstone which underlies most of the spoil has <br />no identifiable permeability. Consequently, no water will flow into the sandstone from the <br />spoil or into the spoil from the sandstone. There is no groundwater in the base of the spoil <br />as discussed in previous material and demonstrated by drilling data. <br />Surficial waters and infiltrate that exist along the drainage will be discharged via the <br />underdrain. Since construction of the underdrain, mine personnel have observed that the <br />underdrain is functioning as designed. Small flows have been observed in wet and spring <br />runoff periods. <br />Permanently Reclaimed Spoil Area <br />The permanently reclaimed spoil azea is approximately 17 acres. The location of this azea <br />is shown on Map 5-10. As described eazlier, this area consists of box cut spoil, blasted <br />sandstone, and overburden material (primarily alluvial terrace sands and gravels) <br />excavated to access the North Pit and the South Pit prior to achieving the steady-state pit. <br />As the spoil filled a segment of the original Cazbon Junction Canyon drainage channel, <br />CDMG required OEI to design and construct the spoil area as if it was an engineered Sll, <br />meeting all the requisite performance standazds. The final configuration of the <br />permanently reclaimed spoil azea blends into the adjacent slopes of the pernut area and <br />provides complimentary topography for the adjacent golf course. Slopes are 3:1 (h:v) or <br />less and drain toward Carbon Junction Canyon. Spoil placement was in four foot lifts <br />which were compacted to specified tolerances. Attainment of adequate compaction and <br />the grade and slopes involved will ensure that saturation and slope failure will not occur <br />(See Stability Study, Appendix 5-6}. A designed underdrain was placed prior to spoil <br />deposition. <br />TROB, TRII (v1.0) 5-25 Revised 9/97, 08/02 <br />
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