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PERMFILE40846
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PERMFILE40846
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Last modified
8/24/2016 10:43:41 PM
Creation date
11/20/2007 10:31:52 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C1981013
IBM Index Class Name
Permit File
Doc Date
12/11/2001
Section_Exhibit Name
EXHIBIT 06 HYDROLOGY, GEOLOGY, AND WATER QUALITY
Media Type
D
Archive
No
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35 <br />• i determined from the auger hole tests ranged from 0.014'ft/d to 21ft/d. <br />` Attempts to conduct an auger hole test at AL 4-2 failed because the permea- <br />bility was too high. In lieu of the auger hole test, this well was pumped <br />at 30 gpm until an approximately steady state was reached and, from the <br />observed drawdown, the permeability was estimated to be about 1880 ft/d. The <br />water-table depth in the alluvial wells ranged from about 4 ft. to 6 ft. <br />below ground surface and is largely controlled by the water level in the <br />I adjacent stream. <br />The hydraulic conductivity values reported in this section were used <br />to estimate the potential effects on the surface and near-surface waters <br />1 caused by mining beneath the valley. These computations are presented in <br />the section dealing with the hydrologic balance. <br />] WATER QUALITY <br />The effects of the Maxwell and Allen Mines on the quality of the waters <br />• in the Purgatoire River are discussed separately in this section. Following <br />the discussion of the effects of mining, some comments relative to other <br />~ factors influencing the water quality are provided. <br />I <br />Maxwell Mine <br />. The concentrations of chemical species dissolved in both stream and <br />mine waters vary from sample to sample for reasons that ofiten cannot <br />be reliably traced. The variation of water quality makes it difficult to <br />present the data in a completely meaningful way. Table 5 shows the range <br />and mean values for several water quality parameters in the Purgatoire <br />~ River at Stonewall and in the discharges from the two mines. The Stonewall <br />data is selected for comparison because the station is upstream of both <br />mines. Ten data paints were averaged for most of the parameters to obtain <br />the means at Stonewall. "he data are from *_he USGS reports o' ~.vatzr quality <br />I at station No. 07124050. The data in Table 5 for the two mines ~.vere taken <br />i <br />front 6 analyses of Allen Mine discharge and 5 analyses of Maxwell Mine <br />II discharge. Commercial Testing and Engineering Co. made the analytical <br />. determinations and copies of their reports are included in Appendix E. <br />~II The qualities of the mine discharges and the water at Stonewall are <br /> <br />
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