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2012-07-27_REPORT - C1981028
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2012-07-27_REPORT - C1981028
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Last modified
8/24/2016 5:04:08 PM
Creation date
7/31/2012 8:33:47 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981028
IBM Index Class Name
Report
Doc Date
7/27/2012
Doc Name
2011 AHR Letter
From
DRMS
To
Coors Energy Company
Annual Report Year
2011
Permit Index Doc Type
Hydrology Report
Email Name
JLE
SB1
Media Type
D
Archive
No
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Require- <br />ment <br />Requirement <br />Requirement complied Comment <br />citation <br />with? <br />(yes / no) <br />Each pit disrupts the potentiometric surface. After final <br />backfilling, the pits can be expected to show full recovery <br />S. Restoration of <br />of the potentiometric surface outside of the pits and water <br />ground water CDRMS <br />table (unconfined) conditions inside the pits. No <br />yes <br />recharge to regulation <br /> <br />significant formation of surface spoil springs is expected <br />approximate 4.05.11(3) <br />due to the flat topography; therefore, there will be no loss <br />premining rate <br />of ground water flows to surface waters. <br /> <br />The Probable Hydrologic Consequences section of the <br />permit application predicts no appreciable impacts to <br />T.Prevention of <br />ground water systems outside the permit area. Water <br />adverse impacts CDRMS <br />quality data from well DH-96 indicate there have been no <br />yes <br />to ground water regulation <br /> <br />adverse impacts to ground water in the Ennis alluvium and <br />systems outside 4.05.11 <br />eolian sand outside the permit area, several thousand feet <br />the permit area <br /> <br /> <br />The approved post-mining land use of most of the permit <br />area is rangeland (a few acres are approved for <br />U. Prevention of <br />commercial/industrial gas well use). As previously <br />impacts to ground <br />CDRMS discussed, ground water in the Ennis alluvium and eolian <br />water that <br />regulations sand have not been adversely impacted by mining and <br />yes <br />adversely impact <br /> <br />4.05.1(2) and reclamation operations at the Keenesburg Mine. Ground <br />the postmining <br />4.05.11 water in the Laramie coal and sandstone is not likely to have <br />land use within <br />had adverse impacts as explained in the previous discussion <br />the permit area <br />of Basic Standards for Ground Water. <br /> <br />V. Minimization of <br />disturbance to the <br />CDRMS Changes to the hydrologic balance within and adjacent to the <br />hydrologic <br />yes <br />regulation permit area, if any, would be the minimum that can be <br /> <br />balance within <br />4.05.1(1) expected from a surface coal mining operation. <br />and adjacent to <br />the permit area <br />W. Prevention of <br />material damage CDRMS Previously discussed monitoring data and ground water <br />yes <br />to the hydrologic regulation quality predictions indicate material damage has been <br /> <br />balance outside 4.05.1(1) prevented. <br />the permit area <br />The Probable Hydrologic Consequences section of the <br />CDRMS <br />X. Agreement of permit application predicts no appreciable impacts to the <br />regulation <br />observed hydrologic balance. Monitoring data in the hydrology <br />2.05.6(2) and <br />hydrologic report confirms this prediction. No impacts to ground <br />requirement <br />impacts with water have been found in downgradient alluvial/eolian <br />to keep <br />yes <br />sand monitoring well, DH-96. Should degradation of <br /> <br />information <br />hydrologic ground water by leachate immediately adjacent to pits <br />current, <br />occur, it would be a minor impact. No adverse impacts to <br />CDRMS <br />(PHC) projected surface water quality have been found at the Keenesburg <br />regulation <br />in mining permit Mine. <br /> <br />2.03.3(1) <br /> <br />Page 3 <br />
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