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HYDRO27556
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HYDRO27556
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Entry Properties
Last modified
8/24/2016 8:46:58 PM
Creation date
11/20/2007 8:08:20 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980005
IBM Index Class Name
Hydrology
Doc Date
3/4/1991
Doc Name
MEMO PRELIMINARY EVALUATION SEDIMENTATION CONTROL DAM 006 SENECA II HAYDEN COLO PEABODY COAL CO
From
US DEPT OF LABOR
To
COAL MINE SAFETY AND HEALTH
Permit Index Doc Type
CORRESPONDENCE
Media Type
D
Archive
No
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-~ . <br /> <br />3 <br />calculations to support lining selection and construction specifications are normally <br />required. <br />2. The issue of incised impounding capability is often confused. As interpreted in this <br />office, the incised volume must be restrained by massive soil or rock volumes to <br />preclude the remote possibility of overtopping and breaching, underseepage and piping, <br />and slope stability problems. Any combination of native soils and placed embankment <br />material that geometrically appears as a dam is treated as a dam in its entirety. For <br />example, an "incised" pond on an open pit highwall that exhibits a conventional dam <br />shape with aten-foot crest width should be evaluated as a dam. <br />3. When routing the design storm, the normal pool elevation prior to the event should <br />be set at the lowest ungated spillway for calculative purposes. This elevation does not <br />include slot or small holes drilled, cut, or burned into a decant riser below a typical <br />barrel inlet. Further, all typical barrel inlets should be protected with suitable trash <br />retardant structures. Such structures should be sized to minimize velocity into the <br />conduit. <br />Through my examination of the material submitted I have concluded that the facility in <br />question does fall under MSHA jurisdiction with regard to potential impounding <br />capability. I have not assessed hazard potential and some technical aspects of the <br />design. A thorough evaluation will require additional information. <br />Please contact this office if there are any questions about this memorandum or data <br />requirements for a complete submittal. <br />cc: J. Spicer <br />J. Mulhern <br />M. Stanton <br />B. Keffelew <br />Acting Chief, S&HTC <br />
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