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PERMFILE111851
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PERMFILE111851
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Last modified
8/24/2016 10:08:19 PM
Creation date
11/24/2007 8:56:18 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1982057A
IBM Index Class Name
Permit File
Doc Date
5/1/2003
Section_Exhibit Name
Tab 07 Hydrologic Description
Media Type
D
Archive
Yes
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• are shown. Flow gradients were calculated by dividing the difference between water <br /> surface elevations at two wells by the channel distance between the wells. <br />At the USGS alluvial wells (A1-A13) along a portion of Sage Creek, the water table <br />gradient ranges from 0.024 ft/ft to 0.0275 ft/ft in the direction of alluvial ground water <br />flow. The Sage Creek alluvial aquifer flow direction is to the north, essentially <br />paralleling the drainage direction. In the Dry Creek alluvial system, alluvial aquifer <br />water table gradients range from 0.015 ft/ft to 0.034 ft/f t. The water table gradients <br />along those portions of the 006 tributary and Watering Trough Gulch that are monitored are <br />very similar; whereas, the gradient for the portion of Hubberson Gulch monitored is less <br />than half (0.015 ft/f t) that of the other two alluvial aquifer systems. Flow in these <br />portions of the Dry Creek alluvial system is to the north. <br />The potentiometric surface for the overburden aquifer is shown on Exhibit 7-2. The <br />potentiometric surface for the overburden aquifer was constructed using the arithmetic <br />mean of the values for the period of record that are believed valid. Water in the <br />overburden aquifer is principally unconfined. Saturated thickness increases in the <br />• direction of dip. The central and northern mining areas in the vicinity of Wells 30V, <br />110V, 120V, 140V, 150V, and 160V have the least amount of saturation in the overburden <br />with saturated thicknesses ranging from 0 to 41 feet. The extreme northern area and the <br />area south of the 006 tributary near Hubberson Gulch have the greatest saturated <br />thicknesses (140-321 feet), and the aquifer is flowing artesian at Well 20V. The <br />direction of flow is topographically controlled and is to the west and northwest. Flow <br />gradients in the northern area range from 0.14 to 0.15 ft/f t. In the central mining area, <br />flow gradients lessen to 0.09 to 0.11 ft/ft and in the southern portion of Seneca II-W, <br />they range from 0.10 to 0.055 ft/ft with the steeper gradients being in the vicinity of <br />the crop. <br />The potentiometric surface for the Wadge coal aquifer is shown on Exhibit 7-3. The <br />potentiometric surface for the Wadge coal was constructed using the arithmetic mean of the <br />values for the period of record that are believed valid. Water in the Wadge coal aquifer <br />is typically confined; however, three wells (10W, 14W, and 16W) in the northern mining <br />area indicate unconfined conditions. Artesian head increases in the direction of dip with <br /> the smaller amounts of head nearer the crop and in the northern mining area. The <br />• direction of flow is towards the west and northwest. Flow gradi ents are steepest in the <br /> vicinity of the crop. The gradient in the northern area is 0.15 ft/ft, while flow <br />19 <br />
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