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RULE 2 PERMITS <br />The geologic characteristics of the Williams Fork and Iles Formations appear to demonstrate natural low <br />porosity and permeability that is enhanced locally by fracturing. Since most of the beds in the Williams <br />Fork are not laterally extensive, and due to the relatively low yielding characteristics, the Williams Fork <br />in this area can not be considered to be a significant aquifer. <br />The groundwater quality has been shown to be of poor quality and is variable from site to site. A study <br />conducted in 1974 and 1975 revealed that the specific conductance of the groundwater averaged 1390 <br />mmhos and ranged 720 to 2700 mmhos. The results of a 1979 study conducted by Leonard Rice <br />Consulting Water Engineers show that overall quality has not been significantly affected by mining <br />activities. <br />The report stated that measurements made in 1979 were within the range of variation seen in 1974 and <br />1975, though they were in general lower than the historical data. The most probable explanation of this <br />apparent increase in water quality may be a dilution effect from the relatively high runoff throughout the <br />spring and summer of 1979. The report stated that there is no evidence of contamination of the <br />groundwater by the surface mining of Colowyo Coal Company. Additional monitoring of the Goodspring <br />Creek alluvium/colluvium and downdip of the Gossard Loadout also indicates groundwater quality has <br />not been significantly affected by mining activities. <br />Rule 2 Permits 2.04.7-12 Revision Date: 6/23/08 <br />Revision No.: MR-91