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HYDRO30182
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Entry Properties
Last modified
8/24/2016 8:48:58 PM
Creation date
11/21/2007 12:02:08 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1980244
IBM Index Class Name
Hydrology
Doc Date
1/31/1995
Doc Name
CRIPPLE CREEK & VICTOR GOLD CDPS PERMIT CO-0043648 PERMIT PENDING SURFACE WATER STREAM STANDARDS
From
COLO DEPT OF PUBLIC HEALTH & ENVIRONMENT
To
DMG
Media Type
D
Archive
No
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Part I <br />Page No. 3 <br />Permit No.: CO-0045225 <br />PART 1 <br />A. TERMS AND CONDITIONS -ENHANCED MANAGEMENT PRACTICES (EMP's) <br />Beginning no later than the effective date of this permit and lasting through August 31, 2002, the permittee is authorized to <br />operate under the terms and conditions of this permit. Discharges are authorized only from the following specific points: <br />002A, which is the discharge Crom the settling pond located at the Crusher Area, going to the diversion canal which <br />surrounds the beach Facility; points 003A, which is from the lower of two settling ponds located at the Ironclad <br />Overburden Storage Area, discharging to Sgtraw Gulch; and 004A, which is from a settling pond located downstream <br />o[ a mine haul road, discharging to Squaw Gulch. <br />In accordance with the Water Quality Convol Commission Regulations for Effluent Limitations, Section 10.1.3, and <br />Regulatiots for State Discharge Permit System, Section 6.9.2, 5 C.C.R. 1002-2, the permitted dischage comply with the <br />i;,llowing conditions: <br />Ironclad Overburden Storage Area <br />a) Upper Pond <br />i. The existing pond has a holding capacity of just over the volume of runoff resulting from a ]0-year, <br />24-hour precipitation event. As the mining activity progresses, the pond size must continue to be at <br />least as large as the volttme of nutoff resulting from a 10-year, 24-hour precipitation event, <br />accounting for changes in the area contributing flow to the pond. Any potential for a discharge from <br />the pond is expected to disappear as mining progresses. <br />ii. No discharge is allowed from the upper pond, except overflow releases (the pond volume being <br />exceeded) are allowed. Regeneration of this pond's ability to hold the volume of runoff resulting from <br />a 10-yr/24-hr precipitation event is expected to be provided through evaporation and through <br />infiltration, which due to site-specific conditions is expected to be very high. <br />iii. The permi«ee must take all reasonable steps to minimize the amount of overflow, and all monitoring <br />and notification requirements of the permit must be complied with. <br />iv. It seepage or overflow from the upper pond into the lower pond occurs, such that the holding capacity <br />of the lower pond to contain the volume of runoff resulting from a 10-yr/24-hr precipitation event is <br />compromised, the permit may be reopened. <br />b) Lower Pond <br />The lower pond volume currently has the capacity to hold between 3 and 4 times the volume of runoff <br />resulting from a 10-year, 24-hour precipitation event. A level of containment equal to 3 times the <br />volume of runoff resulting from a 10-yeaz, 24-hour precipitation event must be provided until <br />commencement of reclamation of the Ironclad Overburden Storage Area. <br />ii. The pond embanlanent must be constructed to withstand [he peak flow associated with at least a 10- <br />yr/24-hour storm event, and the downstream face of the embanl®ent must be constructed of materials <br />that are no[ easily eroded. An overflow spillway must be provided which will protect the structural <br />integrity of the embanlanent, as well as avoid excessive erosion of the downstream stream bed. <br />iii. Because of the relatively large size of the pond in relation to the drainage area, and because of the <br />likelihood that there will be high infilvation rates, it is reasonable to expecC that the ability to capttue <br />the volume of runoff resulting from a 10-yeaz, 24-hour precipitation event will be continuously <br />maintained without a discharge to surface waters. <br />
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