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2012-03-07_HYDROLOGY - C1981033
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2012-03-07_HYDROLOGY - C1981033
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Entry Properties
Last modified
8/24/2016 4:54:49 PM
Creation date
3/8/2012 6:58:40 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981033
IBM Index Class Name
Hydrology
Doc Date
3/7/2012
Doc Name
Hillside Seep Memo
From
Mike Boulay
To
Sandra Brown
Permit Index Doc Type
Correspondence
Email Name
SB1
MPB
Media Type
D
Archive
No
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Sandra Brown <br />March 7, 2012 Page 5 <br />the pressure head above the Bear and Edwards Mines. In approximately 2001 -2002 the pipeline <br />was dismantled and the location of the pipeline and discharge point was reclaimed. The local <br />groundwater regime has since stabilized. The seep continues to discharge at a reduced flow of <br />less than 5 gpm but continues to be elevated in temperature (recent measurements taken monthly <br />in 2011 show an average 39.7° C or 103.5° F). <br />In 1999 the Division approved TR -27 for the design and construction of a shallow water <br />treatment pond to manage the seep discharge. A treatment pond was constructed during May <br />and June 2001 in accordance with the plan presented on Drawing 11 -4 of the permit document. <br />The spring water is piped into the pond, passively treated and then discharged into the North <br />Fork of the Gunnison River. Bear Mine No. 3 has two CDPS discharge points under their <br />current permit. Outfall 001 to the North Fork of the Gunnison River is described in the CDPS <br />permit as mine water discharge. Outfall 001 is the external outfall from the treatment pond. <br />Outfall 004 to the North Fork of the Gunnison River is described in the CDPS permit as surface <br />runoff water discharge and is the external outfall from Pond 4. Pond 4 has never discharged <br />since its construction. <br />The slide area remains the same at the Bear Mine yard and was not reworked or reclaimed with <br />regard to the escarpment or colluvial slide material. The seep discharge location also is <br />unchanged. Water ownership still remains undetermined and is probably irrelevant at this point. <br />The source of the water is likely groundwater discharge beneath the steep colluvial slope. There <br />may be some pooling of groundwater inflow in the B -seam gob area contributing to the <br />discharge. Some still postulate that the discharge is from the Edwards Mine portals. If this is the <br />case then it is noteworthy that the Edwards Mine and associated portals were a "Pre -Law" mine <br />that was operated and reclaimed prior to the State of Colorado's Permanent Coal Regulatory <br />Program. Pre -law refers to those lands that are mined prior to the passage of the Surface Coal <br />Mining Reclamation Act and the Federal interim rules which took effect on May 5, 1978. For <br />the lands mined prior to the passage of SMCRA, the Colorado Open Mining Land Reclamation <br />Act of 1973 as amended in 1976, regulated coal mining activities. The Edwards Mine operated <br />in the 1950's and was closed in 1964 prior to the passage of both of these important Acts. When <br />BCC started the Bear No. 3 Mine in the early 1980's, the operator decided to use the old <br />Edwards (Clark) Mine C -seam portals for access to the C -seam coal, rather than construct their <br />own portals. As previously described the C -seam portals have been properly sealed and there <br />has never been any discharge. The Edwards B -seam portals were undoubtedly sealed sometime <br />in the 1960's. If the water is discharging from the Edwards B -seam portals as postulated, then <br />reclamation liability is not relevant and difficult to assess since this was a Pre -Law mine <br />disturbance. <br />The spring remains warm to this day suggesting two plausible explanations 1) a mine fire or 2) a <br />geothermal heat source heating groundwater inflow or mine pool as it passes through or near the <br />B -seam workings. The Bear Mine was evaluated in the fall of 2003 by our Inactive Mines <br />Reclamation Program for the purpose of determining whether a fire on the site was eligible for <br />Abandoned Mined Land funding. At the time of the evaluation, steam was observed to be <br />emanating from fractures in the ground, from an area that is presumed to be the previous location <br />of the C Seam entries. The majority of the venting features appear to align with each other, <br />
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