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HYDRO22157
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Entry Properties
Last modified
8/24/2016 8:43:16 PM
Creation date
11/20/2007 2:45:58 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1982056
IBM Index Class Name
Hydrology
Doc Date
6/14/1989
Doc Name
FINAL PERMIT COLO WASTEWATER DISCHARGE PERMIT SYSTEM # CO-0042161 TWENTYMILE COAL CO
From
CDOH
To
TWENTYMILE COAL CO
Permit Index Doc Type
NPDES
Media Type
D
Archive
No
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COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division <br />Rationale - Page 2. Permit No. CO-0042161 <br />FACILITY DESCRIPTION: <br />The facility is an underground coal mine. The current production rate,is 0.5 <br />million tons of coal per year, and is expected to increase to a maximum of 3.5 <br />million tons per year in 1989. The estimated life of the facility is 35 years. <br />The new mine (Foidel Creek Mine) is connected to an existing series of mines, <br />Mines 1, 2, and Eckman Park, which are operated by Colorado Yampa Coal Company <br />(CYC). (Twentymile Coal and CYC are both owned by Cyprus Yampa Valley Coal.) <br />The CYC mine is covered under discharge permit number CO-0027154. Currently, <br />dewatering activities channel all of the underground mine discharge through <br />Pond D, which discharges to outfall 005 of the CO-0027154 permit. Twentymile <br />Coal plans to construct another underground mine dewatering location at a site <br />about two miles northwest of 005. This new point (001) will now handle the <br />majority of the mine drainage. However, both 005 (at the CYC mine) and 001 <br />(at the Fish Creek dewatering site) will be utilized for the duration of the <br />Foidel Creek Mine operation. <br />At the new dewatering location, water will be collected underground by sumps <br />and then pumped through a borehole to the surface. Prior to its discharge to <br />Fish Creek, the water will be treated in a series of two settling ponds. <br />(There will be three ponds on site, so that one can be taken out of use for <br />. maintenance as needed.) Approximately 60-90 gpm will be channeled through 005 <br />(at the CYC mine), and the remaining amount will pass through the Fish Creek <br />system. <br />Discharge point 001 shall be the outfall from the settling pond to Fish <br />Creek. The settling ponds have been designed to allow sufficient settling <br />time for a potential maximum flow of 1000 gpm (1.44 MGD). It is anticipated <br />that the long term flow rate will be about 300 gpm (0.432 MGD). The ponds <br />will be constructed in a previously surface-mined area which was revegetated <br />in 1976, and has since been released from bond. Adjacent surface runoff will <br />be diverted away from the pond; consequently, the structure does not require <br />storage for a 10-year, 24-hour event and has not been designed for such. No <br />discharge of surface runoff is planned for the facility. The new site will <br />consist of only the borehole and the ponds; there are no plans for a bath <br />house or other sanitary facility at the site. <br />The permittee has indicated that, if necessary, a polyaluminum chloride <br />coagulant will be used for treatment of discharge. For further information on <br />this, see Discussion, paragraphs E and K. <br />MONITORING SUMMARY AND OPERATING HISTORY: <br />This is a new facility, so there is no operating history available. However, <br />an analysis of comparable effluent (essentially, the same mine water as will <br />be discharged at 001) was submitted with the permit application (see Appendix <br />. B). These analyses were conducted on mine water before treatment i^ Pond D <br />(the CYC mine), and at 005 after treatment in Pond D. The data do not <br />indicate any problems. (See Appendix C for calculated limits for some of the <br />parameters.) <br />
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