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PERMFILE61451
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PERMFILE61451
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Last modified
8/24/2016 11:08:02 PM
Creation date
11/20/2007 7:09:58 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980007A
IBM Index Class Name
Permit File
Doc Date
12/11/2001
Section_Exhibit Name
Exhibit 69 Section A II. Mine Dewatering and Treatment Facilities Project Description
Media Type
D
Archive
Yes
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Mountain Coal Company Exhibit 69 <br />West Elk Mine Mine Dewatering & Treatment Facilities <br />i <br />• <br />Ntine Dewatering and Treatment Facilities Description <br />Sylvester Gulch Facilities Area <br />Introduction <br />Mountain Coal Company (MCC) proposes to construct new mine dewatering and <br />treatment facilities to be located at the existing dewatering boreholes site within the <br />Sylvester Gulch Facilities Area (SGFA). The treatment facilities will provide a method of <br />reducing total suspended solids (TSS) from the mine water, if necessary, and discharge the <br />water to the west fork of Sylvester Gulch in compliance with NPDES discharge permit <br />requirements. <br />The proposed facilities include a Dewatering Pump Station and Treatment Building, <br />Presedimentation Basin, Decant Return Basin and Pump Station, Sludge Drying Lagoons, <br />and Finishing Pond. Figure 1 illustrates the facilities plan. Figure 2 illustrates the process <br />flow diagram for the proposed facilities. <br />Treatment Objectives <br />• Water quality analyses indicate that the mine dewatering and treatment facilities are <br />needed for suspended solids removal. The suspended solids generally consist of non- <br />hazardous and non-toxic clay particles and fine coal particles. Other pollutants and <br />parameters regulated by the NPDES permit, including organics and inorganics, are well <br />within the required limits. The suspended solids concentrations measured at various <br />locations in the mine range from 12 to 3,240 mg/L with an average concentration of 940 <br />mg/I.. The treatment facility has been designed for an influent suspended solids <br />concentration of 1,000 mg/L. The designed effluent TSS concentration will be less than <br />25 mg/L, which provides a 20% safety factor to ensure compliance with the NPDES <br />efr7uent limitations. Due to highly variable flow conditions, the facility designs require a <br />certain level of flexibility and redundancy. To facilitate these requirements, two treatment <br />process trains, 1000 gallons per minute (gpm) each, will be used. <br />• <br />N°v. 199"7 MR232 <br />
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