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• CULTURAL AND HISTORIC RESOURCES (2.04.4) Refer to Section 2.04.3 of the EFCI permit application document (Volume 1). GEOLOGY (2.04.6) Geology of the area which would be effected by the proposed refuse pile expansion is consistent with surrounding areas within the EFCI permit area as documented by drillholes SF-87-05 and 06, and SR-17, 18, 36, 39 and 40, located in proximity to the expansion area. Surficial materials consist of geologically recent interbedded outwash deposits of soil, sand, silt and conglomerates. These deposits, which are derived from the Pre- cambrian Wet Mountain complex, vary from unconsolidated to moderately consolidated with thicknesses up to approximately 120 feet. The outwash deposits overlie the late-Cretaceous Vermejo formation which consists predominantly of sandstones and fine-grained siltstones. The Vermejo • formation which is typically greater than 800 feet in thickness contains the known mineable coal seams in this area. The dominant structural features in this area are the Wet Mountain fault and adjacent Chandler Syncline. The synclinal axis is located approximately 3,000 feet southwest of the area of interest and the fault line is an additional 4,500 feet to the southwest. There is no history or evidence of any geologically recent movement along the fault. There are no known lithologic units or structural features which could be anticipated to adversely effect the stability of the proposed refuse pile expansion. An expanded discussion of site geology is presented in Sections 2.04.5 and 2.04.6 of the EFCI permit application document (Volume 1). HYDROLOGY AND CLIMATOLOGY (2.04.7 and 2.04.81 • The Southfield Mine is located in a semi-arid region with an average annual precipitation of approximately 15 inches. With the exception of diversion of Newlin Creek above the EFCI permit area, neither ground nor surface water resources are extensively utilized in the immediate area. 3