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GENERAL46561
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Last modified
8/24/2016 8:20:26 PM
Creation date
11/23/2007 2:44:15 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1978116
IBM Index Class Name
General Documents
Doc Date
11/3/2005
Doc Name
DMO-Evaluation of Potential Contaminant Migration
From
Cotter Corporation
To
DMG
Permit Index Doc Type
DMO
Media Type
D
Archive
No
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SM-18 Mine Report <br />GeoScience Services <br />conducted in the specific geologic formation, regardless of the locations, or hydraulic <br />properties were estimated based on lithology. Table 2 provides a list of hydraulic <br />properties available for the geologic formations underlying the mine site. There is a <br />limited amount of information that requires estimates for these properties in the <br />groundwater flow and transport model. <br />Moisture characteristic curves for similar porous media found in the shales and <br />sandstones of the site, adapted from a publication by Blumb, Murphy, and Everett (1992), <br />were used to simulate unsaturated moisture conditions. The curves for the unsaturated <br />hydraulic conductivity as a function of moisture content were developed using the <br />methodology presented by Van Genuchten (1978). These functional relationships were <br />used to simulate the transport of water and subsequent contamination in the unsaturated <br />zone above the regional aquifer. <br /> <br /> For the source term, it was assumed that the pore water in the waste rock <br />. maintained a constant concentration for the duration of the simulation. The potential <br />• contaminant concentrations were assumed to be at a value equal to the SPLP results. <br />~ Since rainwater exhibits a higher pH value (less acidic than SPLP leaching fluid) and <br />~ would leach less constituents of concern, the waste rockpore-water contaminant <br />~ concentrations would decline with time. Consequently, the source term used in the model <br /> <br /> is highly conservative and over predicts the amount of potential contamination auailable <br />• for transport. <br /> <br />~ Table 3 provides sorption coefficients for the analytes of interest (units are cubic <br />~ meters per kilogram). Most of the analytes aze mobile but exhibit some degree of <br />~ sorption in sands and clays that are typical of the geologic material in the area. <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />~ 8 <br /> <br /> <br />
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