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PERMFILE121316
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PERMFILE121316
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Last modified
8/24/2016 10:19:44 PM
Creation date
11/25/2007 9:15:10 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1982056
IBM Index Class Name
Permit File
Doc Date
12/11/2001
Section_Exhibit Name
EXHIBIT 39 MINE INFLOW ESTIMATES
Media Type
D
Archive
No
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r Getty Task 2 Page 27 Merch 1, 1983 <br /> <br /> mine iastantaaeoasly penetrates the entire length of the fracture zone. Ia <br /> reality, this will not occur and a time period of several days would be I <br /> required to fully penetrate the fracture zone. As a result, somewhat smaller <br /> inflows to the mine could be expected. In addition, the calculations assume <br /> that there is ao vertical resistance to flow in the fracture zone. This is a <br /> highly unlikely scenario as nay material that exists is the zone would <br /> restz ict flow and lead to even smaller inflow rates. The values in Table 2 <br /> should be viewed as probable mazimum estimates of the amonat of flow that can <br />I be ezpected if such a fracture zone is encountered daring advance of the mine. ~ <br /> Suppose that two such fracture zones ezist and are separated by a <br />T <br />! <br />! aoa-fractured zone. Inflows to the first zone would be as presented in Table <br /> 2, bat inflows at the second zone would not be ezpected to be as high since <br /> removal of water from the underlying agaifer would cause a decline is <br /> piezometric head throughout the aquifer. The amonat of drawdowa caused by <br />i penetration of the second zone would not be as large, therefore. Although as <br /> exact solution to flow to aline sink affected by drawdowa is difficult to <br /> obtain, as approzimate solution can be obtained by assuming that the head in <br /> the aquifer is equal to the initial head minas the drawdowa ceased by the <br /> first sink (superposition theory). McWhorter and Snnada (1977) present an <br />j <br />1 <br />i egnatioa for calculating drawdowa as a faactioa of time at say distance from <br /> the line sink: <br />z <br />(4 a t) <br />where : = perpendicular distance from line sink, <br />L s = drawdowa at distance : and time t. <br />(8) <br />L Other variables are as defined for Equation 7. Ia the above equation erfc <br />denotes the complimentary error function which is tablated is many <br />L mathematical handbooks. <br />As an ezample of amounts of inflow that could be ezpected from s second <br />fracture zone, the fault zone that exists approzimately 2900 feet from the <br />mine entry was assumed to have the same characteristics as those used in the <br />previous example. Based oa a mine advance rate of 13.5 feet per day as • <br />~' calculated from the mine plan, the second fracture zone would be encountered <br />I <br />
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