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GENERAL31415
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Last modified
8/24/2016 7:54:34 PM
Creation date
11/23/2007 7:00:32 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981038
IBM Index Class Name
General Documents
Doc Date
9/3/1992
Doc Name
PROPOSED DECISION & FINDINGS OF COMPLIANCE FOR FEDERAL COAL LEASES
Permit Index Doc Type
Other Permits
Media Type
D
Archive
No
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-31- <br />subsidence. CWI has timed the sequence of mining to intentionally mine areas <br />over the next five years that do not contain significant and critical water <br />resources. This practice will allow CWI to mine, while at the same time <br />enable the collection of hydrologic and subsidence monitoring data. Such data <br />can then be used in later permit terms when significant water resources are in <br />question. <br />Should damage to arty pipeline, spring, pond, etc. be identified as the result <br />of mining, CWI will repair the damage in accordance with their "Subsidence <br />Repair Handbook". This handbook, incorporated into Volume 3 of the <br />application, contains detailed procedures that will be implemented to repair <br />water resources and structures should they be impacted. <br />A general water replacement plan has been prepared by CWI to augment water to <br />water users while arty mine related damage is being repaired. CWI has <br />demonstrated water is available and can be transported to affected water users <br />if damage occurs. Their water rights consist of both springs and ditch water <br />that could supply a variety of users. Impacts on water users will not be all <br />at once. Rather, impact will progress slowly over areas as coal is mined. <br />CWI also proposes to reduce leaks and seeps on same ditches and to change the <br />point of diversion of the Overland Ditch from East Roatcap Creek to West <br />Roatcap Creek to further protect the rights of present water users. To <br />protect stock and wildlife, CWI has committed to maintaining a designated <br />number of stock ponds on the permit area which will be protected from damage. <br />When CWI mines under Steven's and East Roatcap Creek, water may be encountered <br />even if there is no subsidence. Faults and fractures may be encountered <br />underground that are in camnunication with the stream and its associated <br />alluvial/colluvial deposits. Dewatering of these faults and fractures could <br />diminish streamflow and the alluvium/colluvium when water is present. The <br />limited depletions are not predicted to be significant enough to cause a major <br />change in stream characteristics or impact the hydrologic balance. The only <br />concern with diminishment of Steven's Gulch or East Roatcap Creek stream flow <br />would be to water users within those drainages. CWI has responded to this <br />concern in their water replacement plan. The Division's findings on this <br />issue are included in the Water Rights and Replacement discussion in <br />Section YII of this document. <br />Based on data from other mines in the valley the Division would anticipate <br />stream related inflows to be only a few hundred gallons per minute at worst <br />case during certain times of the year when the streams are flowing. Following <br />a detailed investigation and analysis, the operator has predicted that worst <br />case inflows from East Roatcap Creek would be 5.2 gpm and inflows from <br />Steven's Gulch would be 5.7 gpm. These would increase to 33.5 gpm for the <br />life of mine. Inflows below East Roatcap Creek have averaged less than <br />1 gpm. A mitigation plan was presented by CWI that will replace aRy water <br />lost by mining. <br />The hydrologic consequences of the mine are expected to be minimal. The <br />applicant reports that no degradation of water quoit y in surface streams is <br />expected. Aqy effluent will be treated as necessary to meet quality standards <br />prior to discharge. Although mine inflows are currently small, if inflows are <br />encountered the application contains a plan fora collection and treatment <br />prior to discharge. <br />
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