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PERMFILE116454
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PERMFILE116454
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Last modified
8/24/2016 10:12:18 PM
Creation date
11/25/2007 2:20:03 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1982057A
IBM Index Class Name
Permit File
Doc Date
5/1/2003
Section_Exhibit Name
Tab 16 Protection of the Hydrologic Balance
Media Type
D
Archive
Yes
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As described in Tab 7 (Hydrologic Descriptionl, natural ground waters at the Seneca II-W Mine contain <br />high concentrations of dissolved minerals and solids. The resaturation of spoil materials will augment <br />the natural ground water recharge system; howev~sr, the quality of ground water in the spoil will not be <br />similar to the premining water quality in this unit. Analysis of the impact of spoil material (Tab 171 <br />indicates that the ground water recharged by the spoil water will affect the quality of the ground water. <br />In general, the dissolved solids content of the ground water is expected to increase to a level greater <br />than the baseline TDS level. In the II-W South area, TDS increases possible are 41 % (3,640 mg/LI in <br />the overburden aquifer and 255% 12,733 mg/LI in the coal aquifer. <br />SCC does not anticipate the transfer of ownership or use of any ground water wells completed in units <br />within the Seneca II-W complex. All boreholes, wells, shafts, and auger holes will be cased and/or <br />sealed to prevent possible ground water degradation through the mixing of ground water and/or surface <br />water that could occur within the borehole. A spf:cific plan far sealing of boreholes, exploration holes, <br />auger holes, wells, and shafts is contained in Tab 'I 8, Hydrologic Reclamation Plan. <br />Ground Water Quantity. Typical backfilling methods primarily involve the use of dozers and scrapers <br />(see Tab 20, Backfilling and Gradingl. Studies .by Rahn (1976) and VanVoast and Hedges (1975) <br />indicate that replaced spoil materials display greater porosities and hydraulic conductivities due to the <br />increased void space, regardless of how the spoil is backfilled in the pits. Spoil backfilling using the <br />methods described in Tab 20 (Backfilling and Gradingl will ensure the eventual resaturation of the <br />disturbed areas (pitsl, and thus minimize the adver::e effects of mining on ground water flow. <br />The Seneca II-W complex is located in an area that has a climate yielding 18 to 22 inches of annual <br />precipitation. Evapotranspiration rates in the region are relatively high (see Tab 7, Hydrologic <br />Descriptionl The infiltration rate of precipitation through the loamy topsoil and spoil is estimated to be <br />slow to moderate. Slow infiltration rates are common for this area and for this climate since the <br />majority of recharge to local aquifers occurs from the gradual infiltration of snowmelt water. <br />Overburden and topsoil handling, reconditioning, and revegetation methods outlined in Tab 22 IMinesoil <br />Reconstruction) and Tab 22 (Revegetation Planl Hrill maximize the potential for establishing reclaimed <br />areas that yield infiltration rates and capacities equal to or greater than premining soil hydraulic <br />conditions. Reseeding and- mulching of redistributed topsoil in a timely manner will augment the <br />retention and eventual downward movement of soil moisture. Since the texture of the replaced topsoil <br />is generally a sandy loam to clay loam, the infiltration rate through the topsoil will be moderate. Deep <br />ripping of final graded spoil where severe compaction exists, followed by topsoil placement and disking <br />will enhance the infiltration potential of the reclaimed materials. <br />Ground water accumulating in significant amounts in the mining pits will be removed by pumping the <br />• <br />water to those sediment ponds designed to have the prescribed minimum volume for the 10-year, 24- <br />hour storm event. Design criteria for the ponds is described in Tab 13 (Facilitiesl, and it includes plans <br />:Z ~ Revision 9/98 <br />
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