REP17444

• Permit No: C1980006
• IBM Index Class Name: REPORT
• Doc Date: 7/20/2007
• Doc Name: 2006 AHR Review Letter
• From: DRMS
• To: Northwest Colorado Consultants
• Annual Report Year: 2006
• Permit Index Doc Type: Hydrology Report
• Media Type: D
• Archive: No

Require-

Requirement Require-ment
citation ment
complied
Comment
with ?
es/no
O. Prevention of The approved post-mining land use of most of the permit
impacts to
ground water
CDRMS area is rangeland. As previously discussed, ground water in

that adversely
regulations the overburden and coal seam have not been adversely
impact the 4.05.1(2) and Yes impacted by mining and reclamation operations at the Marr
postmining land 4.05.1 1 Mine. Spoil Ieachate is not likely to degrade ground water in
use within the the future as explained in the previous discussion of Basic
Standards for Ground Water.
ermit area
P. Minimization of
disturbance to the CDRMS Changes to the hydrologic balance within and adjacent to the
hydrologic regulation eS permit area, if any, would be the minimum that can be
balance within 4.05.1(1) y expected from a surface coal mining operation.
and adjacent to
the emit azea
Q. Prevention of
material damage CDRMS As previously discussed, monitoring data indicate material
to the hydrologic regulation Yea damage has been prevented outside the permit area.
balance outside 4.05.1(1)
the ermit area
R. Agreement of CDRMS

observed regulation
The Probable Hydrologic Consequences section of the
hydrologic 2.05.6(2) and
requirement permit application predicts no appreciable impacts to the
impacts with

"
to keep hydrologic balance. Monitoring data in the hydrology
probable information Yes report confirms this prediction. Monitoring data indicate
hydrologic the mine has caused no significant impacts to the quality or
consequences" CDRMS quantity of bedrock ground water, alluvial ground water, or
(PHC) projected
regulation surface water.
in mining permit 2.03.3 1
S. Adequacy of CDRMS The monitoring program is adequate. Based on data in
groundwater regulation yes the annual hydrology report for 2006 and previous years,
monitorin ro ram 4.05.13 1 and as set forth above, the operator has demonstrated for
the mine area, only: the qualities and quantities of runoff
without treatment are consistent with the requirements of
4.05; the operation has minimized disturbance to the
T. Adequacy of CDRMS hydrologic balance in the permit and adjacent areas; the
surface water
regulation
es operation has prevented material damage to the hydrologic
monitoring
4.05.13(2) Y balance outside the permit area; and the water rights of
program other users have been protected. This demonstration by the
operator supports a finding to approve deletion of the
surface and ground water hydrologic monitoring program
in the mine area only, as allowed by Rule 4.05.13 3) b .
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