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PERMFILE52017
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PERMFILE52017
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Entry Properties
Last modified
8/24/2016 10:55:56 PM
Creation date
11/20/2007 3:09:38 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981012A
IBM Index Class Name
Permit File
Doc Date
11/16/2006
Section_Exhibit Name
Section 2.05 Operation and Reclamation Plan
Media Type
D
Archive
Yes
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One sample from the Preparation Plant thickener was acquired. The <br />preparation plant currently recycles water from the thickener to use in • <br />t:he processing of raw coal. Basin estimates that each raw ton of coal <br />x-equires 20.I gallons to process. Historical losses of water to the <br />x-efuse pile and on the final coal product have resulted in the <br />acquisition of an equivalent 11 gallon:; of water from the Purgatoire at <br />the end of each raw ton. As new water i.s mixing with water in the plant, <br />t:he thickener achieves a chemical egixilibrium. The thickener is an <br />alkaline sodium bicarbonate water of moderately high salinity and low <br />hardness. The total iron concentrations are high in the slurry. The <br />preparation plant process uses magnetite in the separation phase. It is <br />presumed that there is some digestion of this magnetite. In addition, a <br />large percentage of the iron is assumed to be plated on the coals and <br />shales as iron hydroxides. <br />The quality of the slurry water is compared with water from a <br />monitoring well which intersects the Maxwell coal seam, LA 221A, the <br />seepage from the Allen Mine Waste dump, and the MLRD Material Damage <br />Limitations and Recommended Water Quality Standards for the Colorado <br />Department of Health in Table 26A. The original, pre-mine water quality <br />as reflected by the coal aquifer analysis showed a concentration of 775 <br />mg/1 total dissolved solids. This exceeds the MLRD recommended suspect <br />level for domestic use of 250 mg/1 and the MLRD recommended suspect level <br />of 500 mg/1 for flood irrigation. In addition the coal seam aquifer also <br />exceeds MLRD suspect levels for stock watering for iron and manganese. • <br />The water quality of water from the preparation plant slurry <br />differs from that found in the coal aquifer. Comparison of the slurry <br />with WQCC standards shows that the slurry exceeds the irrigation material <br />damage standard for specific conductance and total dissolved solids and <br />that selenium exceeds the recommended water quality criteria standard for <br />aquatic life. <br />Table 26B projects the quality of the water in the flooded workings <br />following five years of pumping and upon discharge through the East <br />Portal, should it occur. The mine currently contains 5.7 x 108 gallons <br />of water. Each year, mine inflows of U.78 acft/day or 9.3 x 10' gallons <br />are added to the flooded workings for a total of 6.63 x 108 gallons at <br />the end of year one. Assuming that Basin pumps 3.69 x 108 gallons of <br />slurry into the mine in the first year at 66% water by volume, pumping <br />over the course of one year will yield 2.43 x 108 gallons per year. <br />After the first year of pumping, the water quality in the mine will <br />reflect a mixing of 63.3% of the original flooded workings water and <br />36.6% of the thickener water. At the end of year 4, the quality in the <br />mine will reflect the thickener water. <br />Mine Inflow. In response to Stipulation 13, mine inflow studies <br />were conducted during the month of August to determine the quantity and • <br />quality of water flowing into the mine. Areas which were examined <br />(Revised 2/6/95) <br />2.05-85 <br />
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