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2009-04-22_PERMIT FILE - C1981019A
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2009-04-22_PERMIT FILE - C1981019A
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Last modified
8/24/2016 3:45:47 PM
Creation date
5/11/2009 1:52:46 PM
Metadata
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Template:
DRMS Permit Index
Permit No
C1981019A
IBM Index Class Name
Permit File
Doc Date
4/22/2009
Section_Exhibit Name
2.05 Operations and Reclamation Plans
Media Type
D
Archive
Yes
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RULE 2 PERMITS <br />Speed limits in the mine area are limited to reduce the likelihood of collisions between vehicles and <br />wildlife. Colowyo employees are fully aware of the possibility of encountering wildlife on and around the <br />mine site and take special care to avoid these species. <br />In summary after 12 years of mining at Colowyo, the question is no longer whether coal mining at <br />Colowyo has had an adverse impact on local wildlife populations. The population of deer and elk in the <br />vicinity of Colowyo is reaching record levels. There is little doubt that wildlife populations are drawn to <br />the reclaimed areas because of the availability of quality herbaceous vegetation. The immediate vicinity <br />around Colowyo has become well known as a wildlife refuge, particularly during big game seasons. <br />The issue now is how can Colowyo assist the CDOW in efforts to control wildlife populations to a level <br />that can be supported by adjacent ranges. To do so, in 1990 we have entered into a cooperative effort with <br />the CDOW to establish a "Ranching For Wildlife" area located south of Hayden. Colowyo has also <br />cooperated with the CDOW in allowing public hunters access to company properties in Axial Basin <br />Ranch to increase harvest of local cow elk populations. <br />The concern for wildlife mitigation has clearly evolved from a concern for the impact of mining on the <br />wildlife population to a concern for involving Colowyo in managing increasing populations. As one of <br />the large landowners in the region, Colowyo will continue to work with the CDOW to assist where <br />possible to manage local wildlife populations. <br />Protection of Hydrolodc Balance and Water Ouality <br />Based on the data, other references available and reclamation plans previously presented in this section, <br />the Colowyo Mine will not adversely affect the hydrologic balance or water quality of the adjacent areas. <br />The Colowyo Coal Company intends to use all practical methods to maintain the hydrologic balance and <br />water quality in its present state and may improve the surface water characteristics as a result of <br />reclamation procedures. The focus of this discussion will center on the permit area as it is the area of <br />mining disturbance. <br />The hydrologic balance, previously discussed, will be protected through a number of procedures designed <br />to mitigate any potential impact from mining. Temporary and permanent diversions will route runoff <br />away from disturbed areas to minimize erosion and sediment loss. Temporary channels are designed to <br />safely pass the runoff from a 10-year, 24-hour precipitation event and, where necessary, will be <br />constructed using bank stabilization methods including energy dissipators, sediment traps, and dug outs or <br />a combination of these methods. Drainage culverts will also use energy dissipators at the outlets if <br />necessary so that runoff will not cause additional erosion and subsequently increased total suspended <br />solids (TSS) levels. Detention ponds will be used to detain runoff water from the disturbed areas to allow <br />the TSS to settle out and to attain acceptable concentrations for other parameters consistent with the <br />requirements of the NPDES Permit. Any Small Area Exemptions (SAE'S) employed will be designed to <br />minimize contributions of TSS to the hydrologic balance. <br />Infiltration and percolation of precipitation in the mine area may be enhanced by the reclamation <br />techniques of contour furrowing on hillsides and the continued excellent revegetation success at Colowyo. <br />Infiltration rates for the pre-mined and post-mine condition of the land were presented earlier. Striffler <br />and Rhodes (1981) showed through field measurements, using an intense rainfall simulation, that <br />infiltration capacities of the mulched and revegetated areas were much greater than the pre-mine <br />estimates. Runoff from the revegetated and contour-furrowed areas has been minor to date, as <br />documented by Colowyo Mine personnel. Flows from Streeter Gulch will be moderated with the <br />detention pond. <br />Rule 2 Permits 2.05-41 Revision Date: 6/23/08 <br />Revision No.: MR-91
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