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Southfield Mine Minor Rnision Request No. 10 -South Fan Installation • 6 <br />approximately 4H:1 V and the bench highwall does not exceed 15 feet in <br />height so there is little potential for adverse stability impacts on the fan <br />installation. <br />An expanded discussion of site geology is presented in Sections 2.04.5 and <br />2.04.6 of the EFCI permit application document (Volume 1). <br />Hydrology and Climatology (2.04.7 and 2.04.8) <br />The Southfield Mine is located in a semi-arid region with average annual <br />precipitation of approximately 15 inches. With the exception of diversion <br />of Newlin Creek above the Southfield permit area, neither ground nor <br />surface water resources are extensively utilized in the immediate area. <br />• The area to be effected by the proposed fan installation lies within the <br />Mineral Creek surface drainage basin. Similar to other small area drainages, <br />Mineral Creek is an ephemeral stream which normally flows only in <br />response to spring snowmelt or major thunderstorm events. The proposed <br />fan site is near the upper end of a small tributary to Mineral Creek. Given <br />the limited annual rainfall and relatively high porosity of surficial outwash <br />materials, it is unlikely that any significant runoff from the site would ever <br />reach Mineral Creek. <br />Several lithologic units which occur within the Southfield permit area have <br />the ability to store and/or transmit groundwater. With the exception of the <br />Trinidad sandstone, which is approximately 300 to 500 feet below the <br />surface in this area, all of these units have limited lateral continuity and <br />highly variable permeability due to extensive interbedding. <br /> <br />There are no significant surface or groundwater resources in the immediate <br />area, groundwater utilization is limited to mine use and stock-watering and <br />w¢rnc. • P.O. Bas T7~018. 9emnboar Springs, Cobroda C0IT7• fi0iM79-6760 <br />