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1996-06-25_GENERAL DOCUMENTS - C1980007
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1996-06-25_GENERAL DOCUMENTS - C1980007
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Last modified
2/17/2021 10:45:05 AM
Creation date
11/23/2007 5:42:34 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980007
IBM Index Class Name
General Documents
Doc Date
6/25/1996
Doc Name
Proposed Decision & Findings of Compliance for RN3
Permit Index Doc Type
FINDINGS
Media Type
D
Archive
No
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DRMS Re-OCR
Description:
Signifies Re-OCR Process Performed
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permanent disposal of 1.09 million cubic yards of mine <br /> development waste, and sediment pond cleanout material. <br /> To date the lower refuse pile has not impacted the ground <br /> water zone near Sylvester Gulch. Because of the low <br /> permeability of the colluvial soils and the lack of a ground <br /> water table near the surface in the colluvium, no impacts on <br /> ground water are anticipated. Water monitoring well SG-1, <br /> located near the site of the soil stockpiles, other water quality <br /> monitoring stations on Sylvester Gulch, and sites above and <br /> below the mine on the North Fork of the Gunnison, provide <br /> sufficient baseline water quality information to evaluate the <br /> changes in water quality that could result from the impacts of <br /> this refuse stockpile. Conductivity and TDS from samples of <br /> monitoring well GP-1 showed slightly higher levels in 1986. <br /> However, this does not appear to be a continuing problem. <br /> Concentrations of iron during 1991 were higher than the <br /> baseline monitoring data, which the operator believes may be <br /> associated with B development waste. Concentrations of iron <br /> will be monitored to see if the elevated levels continue. <br /> A leachate study of the F Seam refuse was conducted and <br /> included in the application for the permanent refuse disposal <br /> site in Exhibit 51 of the permit application. In addition, the <br /> effects of B Seam refuse on leachate were also evaluated and <br /> can be found in Exhibit 56. The permeability contrast found in <br /> the pile will cause most of the leachate water to perch within <br /> the refuse pile and above the native soils. A shallow water <br /> mound will build within the pile and cause the water to migrate <br /> laterally to a small seepage area at the edge of the site. During <br /> 1991, there were no visible flows from the pile toe and <br /> midsection underdrain. <br /> Upper Refuse Disposal Area - The upper waste rock pile was <br /> approved, with stipulations on June 14, 1986. This pile has <br /> not been constructed and construction is not proposed for this <br /> permit term. The final pile will cover approximately 40 acres <br /> and contain five million tons of coal reject and developmental <br /> waste rock. The primary predicted impact to ground water is <br /> the development of leachate from precipitation infiltration <br /> through the pile. The approved plan calls for the installation <br /> of five lateral subdrains to collect this leachate. The drains <br /> will help prevent the formation of a large perched leachate <br /> aquifer that may effect the stability of the pile. Additionally, <br /> the drains will intercept most of the leachate and prevent it <br /> from entering the shallow colluvial aquifers. The subdrains <br /> will daylight into surface channels where the leachate will flow <br /> to a sediment pond. As this pile is constructed, spoil wells <br /> 35 <br />
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