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REV08391
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Entry Properties
Last modified
8/25/2016 1:09:01 AM
Creation date
11/21/2007 9:52:56 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980006
IBM Index Class Name
Revision
Doc Date
8/11/1993
Doc Name
KERR COAL CO RESPONSES TO DMG 8-11-93 720 PIT WATER DISCHARGE CONCERNS
Type & Sequence
TR11
Media Type
D
Archive
No
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,September 1993 Km Coal Comparry 1 1 <br />• Maximum possible pond surface azea (digitized azea at discharge elevation of <br />8,200' from 4/89 aerial mapping) - 1,242,000 ft= = 28.5 acres <br />• Average pond surface azea during reclamation - <br />(226,500 + 1,242,000)/2 = 734,300 ft' = 16.9 acres <br />• Calculated evaporative loss - <br />(734,300 ft' x (30 in/yr x Smos/12 x 1/12 in)) = 764,900 ft' = 18 ac-ft <br />Losses Due to Resatura[ion of Spoils <br />• Assume that zone of saturation extends 50 feet laterally from wetted surface of <br />impounded water and that porosity corresponds [o swell (swell is 24 percent bank <br />to compacted, typical porosities for unconsolidated materials range from 25 to 70 <br />percent (Freeze and Cherry, 1979)) <br />• For estimation purposes assume waterline is a rectangle with dimensions as <br />follows: <br />Current Pool (Waterline at elevation 8,020') - 1,460' x 155' =226,300 <br />ftZ <br />Current Pool (Limit of Zone of Saturation) - 1560' x 255' = 397,800 ftZ <br />Ultimate Pool (Limit of Zone of Saturation at dischazge elevation 8,200') - <br />2,400' x 640' = 1,536,000' <br />Ultimate Pool (Waterline at eleva[ion 8,200') - <br />2,300' x 540' = 1,242,000 k' <br />• Thickness of zone of saturation - 180' <br />• Calculated loss due to resaturation of spoils - <br />[(1,536,000 + 397,800) - (1,242,000 + 226,300)]/2 x 180 x 0.24 <br />= 10,014,800 fr' = 230 ac-fr <br />Calculated Discharge Volume <br />• Calculated Discharge Volume - <br />Calculated Pi[ Water Volume (208 ac-ft) + Runoff Inflow (56 ac-fr) <br />- Evapora[ive Losses (18 ac-fr) -Losses Due to Resaturation of Spoils (230 <br />ac-ft) = 16 ac-ft <br />c:~..unoTrtia.noc <br />09/OU9J fpm ACZ /nr. " P.O. Box 774018 " Stmmboat Spnngx Colorado 80477 ' (303J 879-6160 <br />
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