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PERMFILE108415
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PERMFILE108415
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Last modified
8/24/2016 10:00:53 PM
Creation date
11/24/2007 4:47:51 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981032
IBM Index Class Name
Permit File
Doc Date
12/11/2001
Section_Exhibit Name
CHAPTER P MITIGATION PROTECTION OF THE HYDROLOGIC BALANCE
Media Type
D
Archive
No
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Response: As stated in paragraph 6 above, *IOrthern no longer puts all of the <br />mine :.~ater discharge through the sedimentation pond but rather has a diversion <br />• around the pond because the effluent from the mine has been of acceptable <br />quality to discharge directly. Therefore, we are not at this time seeking a <br />"catastrophic precipitatlon event exemption". <br />7. The applicant must indicate where the sediment from this pond will be <br />disposed. <br />Response: Sediment from this pond will be disposed of in the approved refuse <br />facility. <br />8, The applicant should indicate the method and location of structures, pipe- <br />lines, ditches, etc. used [o convey mine water to the sedimentation pond. <br />Response: A map which locates these structures, pipelines, and ditches can be <br />found on F7dlibit P-$ of this volume. <br />9. In the event that the mine closed or a mine pump broke down, is there any <br />possibility of gravity discharge from this mine? <br />Response: It is reasonable to assume that if the mine closed and the nine pump <br />broke dawn for an extended period of time, there could be some gravity discharge <br />of water from the mine. It is, however, very unlikely because the pump would <br />be replaced before water had enough time to build up to discharge. If the mine is <br />permanently closed, the portals will be sealed and designed to prevent water <br />discharge. <br />• 10, When the mine portal is sealed have measures been considered to prevent <br />gravity discharge? If so, what are they? Will hydraulic heads develop be- <br />hind this portal when it is sealed? Has the portal been designed to be <br />structurally stable under these loads? <br />Response: It should be pointed out that the portals are up dip from most of <br />the workings and no hydraulic head is anticipated. However, the seal will be <br />constructed in such a way as to withstand any pressure that develops. <br />Office Area Sediment Control <br />1. The application states that the pond will be dewatered by evaporation and <br />percolation, and that a dewatering device will be available. What type of <br />dewatering device is being referred to? Is it manually operated? At what <br />elevation is it installed? <br />Response: The device referred to is manually operated and portable. The <br />pond in question is so small as to not warrant a permanent installation. <br />2. The applicant must commit to installing a staff marker that clearly <br />identifies the level of the 607, sediment storage elevation. <br />Response: A staff marker has been installed which clearly identifies the <br />level of the 60X sediment storage volume. <br />6 <br />
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