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2000-03-10_GENERAL DOCUMENTS - C1980007
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2000-03-10_GENERAL DOCUMENTS - C1980007
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Last modified
3/27/2021 11:16:27 AM
Creation date
11/23/2007 10:19:44 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980007
IBM Index Class Name
General Documents
Doc Date
3/10/2000
Doc Name
Proposed Decision & Findings of Compliance for PR8
From
Box Canyon Lease
Permit Index Doc Type
FINDINGS
Media Type
D
Archive
No
Tags
DRMS Re-OCR
Description:
Signifies Re-OCR Process Performed
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The B Seam mine will not cause significant hydrologic impacts to <br />groundwater systems in the five-year permit area based on the data <br />provided. <br />The majority of springs are located at or above the F Seam outcrop. A <br />few springs have been identified between the E and F Seam outcrops. <br />No springs have been identified below the E Seam outcrop. <br />Monitoring of springs for baseline data and to assess impacts of mining <br />in the B and F Seams indicates [ha[ mining has very little, if any, <br />impact on spring flows. <br />Some inflows to the mine are expected as mining proceeds under Lone <br />Pine and Gribble Gulches as the valley features are fracture controlled. <br />Inflows in these areas are estimated from 2 to 20 gpm. It is anticipated <br />that the Flow will be in the middle or lower end of the range. <br />If flows into [he mine approached the maximum estimated, 20 gpm, [his <br />would only be approximately 14 percent of the peak spring runoff flow. <br />For this to occur or deplete spring flow, a direct fracture connection to <br />the mine workings must occur and remain open. To date, this has not <br />occurred in Lone Pine Gulch in the F Seam under cover as low as 120 <br />feet. <br />The water balance will not be significantly affected even if the <br />maximum estimated inflows occur, since any mine inflows will <br />ultimately be discharged back to the North Fork of the Gunnison. <br />i. Refuse Material Disposal Impacts on Groundwater - <br />Lower Refuse Disposal and Refuse Pile Expansion Areas- <br />Refuse is generated through the mining process and will be <br />disposed of on the Lower Refuse Disposal and Refuse Pile <br />Expansion sites. The Lower Refuse Pile is permitted for <br />permanent disposal of 1.09 million cubic yards of mine <br />development waste, and sediment pond cleanout material. The <br />Refuse Pile Expansion area is designed to hold 1.38 million tons <br />of material over a life of 9.4 years. Construction of the RPE <br />and refuse placement began in 1997. (The Refuse Pile <br />Expansion is discussed in Permit volume IOB.) <br />To date refuse piles have not impacted the groundwater zone <br />near Sylvester Gulch. Because of the low permeability of the <br />colluvial soils and the lack of a groundwater table near the <br />surface in the colluvium, no impacts on groundwater are <br />anticipated. Water monitoring wells located near the site of the <br />38 <br />
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