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APPCOR11258
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Entry Properties
Last modified
8/24/2016 6:31:38 PM
Creation date
11/19/2007 2:19:00 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1987072
IBM Index Class Name
Application Correspondence
Doc Date
5/8/1987
Doc Name
ADEQUACY REVIEW LA PLATA 1 MINE FN C-87-072
From
MLRD
To
PETER OCONNOR
Media Type
D
Archive
No
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-2- <br />Section 2.05 <br />10, Non-clogging dewatering device. <br />No design was submitted in the revised application, A steel <br />plate or tripod of rods which projects in front of the spillway <br />orifice should be constructed to deflect floating debris away <br />from the pond outlet. <br />11. Pond Design. <br />Cross-sections and stage-storage calculations were included in <br />the revised submittal, however, no detention time calculations <br />were provided. Based on the information submitted, the <br />Division has calculated the size of the dewatering orifice <br />required to provide the theoretical detention time of 24 hours <br />for the 10 year, 24 hour design storm runoff volume. This will <br />require a plate he welded over the end of existing 24 inch CMP <br />spillway with an opening of the specified size located at the <br />bottom of the plate. The calculations and method should be <br />reviewed and, if agreed upon, should be submitted for inclusion <br />in the permit application. <br />New Concerns <br />1. The statement is made in Exhibit 7 that calculations used to design the <br />culverts can be shown if requested. As the drainage system has been <br />revised, the Division requests these calculations be submitted. <br />2. The Division received a statement on May 1, 1987 that it is the <br />intention to use the pond as a stock pond during and after mining. <br />As such, there are some additional considerations which need to be <br />addressed in the permit application. Astable water surface is <br />required to be maintained in the pond. Because the pond has been <br />observed not to be able to hold water, sealing of the pond will be <br />necessary. Sealing of the pond with bentonite, however, has been <br />previously discussed and so this does not impose any additional <br />requirement. <br />As the pond will function as a sedimentation device during mining <br />activities, it is inappropriate to consider its use simultaneously as a <br />stock pond due to water quality limitations. Enclosing of the pond <br />with a fence would allow grazing in the surrounding area if another <br />source of water is found to support this use. <br />The proposal to incorporate the pond as a permanent impoundment can be <br />approved if a commitment to the above measures are included. Prior to <br />conversion of the sediment pond into its post-mining use as a stock <br />pond, an application will need to be suhmitted to the State Engineer's <br />Office for approval of its use as a stock pond. Any modifications <br />necessary to meet these criteria (attached) can be made at that time. <br />
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