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2013-10-28_REPORT - C1981012
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2013-10-28_REPORT - C1981012
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Last modified
8/24/2016 5:34:32 PM
Creation date
10/28/2013 1:33:02 PM
Metadata
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Template:
DRMS Permit Index
Permit No
C1981012
IBM Index Class Name
REPORT
Doc Date
10/28/2013
Doc Name
2012 Annual Hydrology Monitoring Report
From
New Elk Coal Company
To
DRMS
Annual Report Year
2012
Permit Index Doc Type
Hydrology Report
Email Name
LDS
SB1
Media Type
D
Archive
No
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October 2012 Page 3 -2 <br />lost to seepage. However, as the theoretical permeability is very low, no loss of river or alluvial <br />water has been detected. <br />The effects on the side canyon drainages should be similar to the Purgatoire alluvium. <br />Based on general geologic mapping, the alluvial area of each canyon was multiplied by the <br />permeability. The water lost to seepage in Apache Canyon has been estimated at 0.3 gpm. This <br />represents less than one percent of the calculated runoff for this canyon systems. <br />The Purgatoire River monitoring sites, PRS -1 and PRS -4, had flow throughout the year <br />similar to those encountered in previous years. <br />The sewage treatment plant operated into September 2011. The treated water flows to a <br />non - discharging pond. The STP has been removed from service and the effluent transported to <br />the City of Trinidad water treatment plant for treatment. A larger plant is being permitted with <br />CDPHE and will be designed to meet PEL standards. It is expected to be in service by mid -2013. <br />Until then effluent will be treated by the City of Trinidad Plant. There was not sediment pond <br />discharge during the year. <br />Water levels for alluvial wells (PAW- series) were within historic ranges for water levels <br />at each of the monitoring sites. <br />3.1.3 Groundwater <br />As might be anticipated from no noticeable impact from dewatering activities conducted <br />in the 1980s, there has been no noticeable impact on groundwater hydrology from the gradual <br />flooding of the New Elk Mine. The apparent low vertical transmissivity and integrity of the <br />surrounding rocks might inhibit any effect of free water on the recharge of the overburden. The <br />depths to which recovery might be taking place are probably too far removed from the ground <br />surface to manifest any impacts at the surface (seeps and springs) at this time. <br />3.1.4 Piezometers <br />Refuse Disposal Area piezometer readings are included in this report (Table B -10), <br />TH -201, on the first bench, and Th -202 and TH -203 on the second and third benches had <br />minimal water throughout the year. Embankment stability, the primary purpose of the <br />piezometers, is discussed within the quarterly waste pile certifications. <br />3.2 Water Quality <br />3.2.1 Springs and Seeps <br />There is no evidence that mining activities have affected the water quality of springs or <br />seeps, nor are such changes anticipated. Springs and seeps were not monitored during the year. <br />3.2.2 Surface Water (Streams and Rivers, and Ponds and Direct Discharges) <br />Results of water monitoring by the USGS indicate a change in water quality between <br />Stonewall, a location above the New Elk Mine, and Madrid, a location below the Golden Eagle <br />
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