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GENERAL35863
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Last modified
8/24/2016 7:56:39 PM
Creation date
11/23/2007 8:29:15 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980004
IBM Index Class Name
General Documents
Doc Date
4/16/1985
Doc Name
PROPOSED DECISION AND FINDINGS OF COMPLIANCE FOR RN1
Permit Index Doc Type
FINDINGS
Media Type
D
Archive
No
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ground water quantity or quality. Drilling in and around the permit area <br />has indicated that there is little water associated with strata within or <br />near the mine zone. Occurrences of ground water within and adjacent to <br />the permit area are discussed in detail in the Ground Water Hydrology <br />Section of this findings document. <br />As discussed under the AVF section of this findings document, water has <br />been seeping into the mine following extension of the workings eastward <br />to the east fault and northeast down the dip of the coal seam. <br />Information submitted by the applicant indicates that from July, 1982 the <br />water seeping into the mine gradually increased and reached a peak in <br />February, 1983. At that time, two months after mine progress was stopped <br />due to a temporary cessation of operations, the mine inflow amounted to <br />approximately 5.4 gpm. This rate has since decreased to a current rate <br />of about 1.6 gpm. <br />The probable source of mine inflows at this point in time is from the <br />saturated portion of the Cameo seam and to a lesser extent from the east <br />fault. Water entering the mine from the east fault most likely <br />originates from surface water percolating through the fault from surface <br />water and/or shallow aquifers from the upper reaches of McClane Creek. <br />The actual water inflow into the mine amounting to about 1.6 gpm will not <br />have a significant impact on the local hydrologic balance. The portion <br />of the water inflow that originated from McClane Creek and is flowing <br />into the mine along the east fault is insignificant in comparison with <br />the flow in the ephemeral drainage during snowmelt or after major <br />storms. The depletion caused by recharge occurring during this period <br />will not significantly affect the quantity of water in East Salt Creek or <br />its associated alluvium, due to the small depletion relative to high <br />flows. During dry periods when East Salt Creek is at Lower flows, <br />McClane Creek is dry and no depletion is occurring. <br />The remainder (majority) of the inflow is believed to originate from <br />storage in the Cameo seam and discharge from this coal seam is <br />insignificant in comparison with the quantity of water stored in the <br />general area of the Cameo seam or with the recharge capacity into this <br />coal seam. The Cameo seam subcrops into the alluvium along East Salt <br />Creek approximately two miles north of the McClane Canyon Mine. <br />It is not possible that water inflow into the McClane Canyon Mine would <br />impact the alluvium in the East Salt Creek Valley due to the low rate of <br />inflow and distance between the mine and the Cameo seam subcrop into the <br />East Salt Creek alluvium. <br />The quality of water discharged from the McClane Canyon Mine is generally <br />the same or better than water quality in East Salt Creek at the <br />confluence with McClane Creek. Therefore, water discharged from the mine <br />does not have any detrimental impact on the water quality on the surface <br />streams within and downstream of the permit area. <br />-17- <br />
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