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REV94421
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REV94421
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Entry Properties
Last modified
8/25/2016 3:19:52 AM
Creation date
11/21/2007 11:40:20 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981012
IBM Index Class Name
Revision
Doc Date
5/14/1982
Doc Name
TR1 ALLEN MINE FN C-012-81
From
CF&I STEEL CORP
To
MLRD
Type & Sequence
HR2
Media Type
D
Archive
No
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<br /> <br />CF&I was not aware that <br />flume-type structures. <br />question and reduce pot <br />inlet, CF&I proposes to <br />flume while keeping the <br />side boards. <br />this regulation applied to <br />In order to answer this <br />ential trash buildup at the <br />double the bottom width of the <br />same configuration for the <br />3. Expanding the bottom width of the flume to 2 feet (top <br />width 3 ft 6 in.) will improve the ability of the <br />flume to pass trash. CF&I does not plan to install a <br />trash rack at this time as we believe a trash rack <br />would pose greater potential for overflow hazard than <br />prevention benefit. After the flume is installed, it <br />will be monitored and a trash rack or deflector will <br />be installed if needed. <br />4. CF&I has not proposed the flume structure as a <br />permanent installation. The structure will indeed be <br />removed when the upper diversion ditch is reclaimed. <br />During the use period of this structure, the inlet/ <br />• outlet will be maintained on a regular basis as <br />needed. <br />5. What has been referred to by the Division as a land- <br />slide would be more appropriately termed a slope <br />failure. One can merely speculate at this time as to <br />the causes of the slope failure. There are naturally <br />occurring slope failures in the vicinity of the Allen <br />Mine and the slope in question was stable for many <br />years after the railroad cut was constructed. CF&I <br />believes the main contributing factor in the slope <br />failure was that the area became super-saturated from <br />water in the undisturbed water diversion ditch which <br />is required by recent regulation. CFF~I does not <br />intend to backfill the railroad cut upon mine <br />closure. The railroad cut was constructed loop, before <br />the current reclamation laws were enacted and CF&I <br />believes that the proposed flume structure will <br />alleviate the super-saturated condition of the slope. <br />Although some minor movement of the slope is still <br />occurring, CFI believes this movement will stop when <br />the slope is allowed to return to more natural water <br />conditions. This could potentially take a year or two. <br />DWZ/as <br />• 5-iu-R2 <br />OopLIN <br />--~-~ <br />
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