2019-08-27_PERMIT FILE - C1981035A ‎(12)‎

• Permit No: C1981035A
• IBM Index Class Name: Permit File
• Doc Date: 8/27/2019
• Section_Exhibit Name: KII 2.05.6 Mitigation of the Impacts of Mining Operations
• Media Type: D
• Archive: Yes

TR-26 has been approved by the Division to further address ground
water monitoring, springs 8v seeps and additional surface monitoring of
the Hay Gulch Ditch. Data obtained will be used to update the Probable
Hydrologic Consequences and the Cumulative Hydrologic Impact
Assessment of Hay Gulch and surrounding areas.
No significant hydrologic consequences of mining are anticipated. All
coal to be removed from the mine lies above the potentiometric surface of
Hay Gulch, the only known aquifer in the area. Therefore, there should
be no diminution of water quality or quantity to Hay Gulch from the
mine workings due to subsidence related to mining.
Surface drainages from the project area from the main haul road, Small
Area Exemption #I (SME#1), report to a native channel and eventually to
the Hay Gulch Ditch. Nearly all of the runoff from SME#1 reports to a
filter check dam, located adjacent to the cattle guard. This filter check
dam is cleaned out regularly as needed.
Surface drainages north of the Sedimentation Pond from disturbed areas
of the surface facilities report to the Sedimentation Pond for evaporation
and infiltration. In the event a major storm, or series of storms, exceeds
the capacity of the Sedimentation Pond, discharge would report to a
native channel, and eventually the Hay Gulch Ditch. This discharge
point is permitted with the National Pollutant Discharge Elimination
System (NPDES) through Colorado Department of Health and
Environment (CDPHE) discharge permit COG850001 as discharge
number 003. See "Surface Water Monitoring" later in this section for
Monitoring procedures and parameters.
No water is known to occur in any rock unit above or immediately below
the coal seams being mined based on the mining at the National King
Mine within or immediately adjacent to the permit boundaries. Again,
there is little likelihood of significant impact to quantity or quality of
groundwater resources resulting from the King 11 Mine. Should
subsidence related features appear above the mine, water would recharge
into the localized groundwater system and not continue off-site, given the
dissected nature of the project site topography.
The design of the portal facilities and the dip of the strata facilitate
drainage of any encountered water in the workings toward the surface.
While not anticipated, should water be encountered in amounts that
reach the surface, monitoring and control measures will be employed.
Minor Revision MR-49 will consist of drilling one exploration bore hole,
labelled GCC-19-06, on land owned by BLM within the CDRMS permit
boundary. Once completed, this hole will plugged from bottom to top
with concrete. No hydrologic consequences are anticipated.
GCC Energy, LLC King II Mine
Section 2.05.6
Page 5 July 16, 2019 (MR-49)