2008-03-24_GENERAL DOCUMENTS - M2003016 (2)

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Banks and Gesso, LLC EXHIBIT I -SOILS INFORMATION Please refer to Exhibit C-2: Pre-Mining Map (Natural Features) and Exhibit I-1: Soils Map for mapped USDA soils. Overview ~ Soils within the proposed permit area consist of four types including Altvan loam, Aquolls and Aquents, Bankard sandy loam and Dacono clay loam. Altvan loam (indicated as "1" on Exhibit I-1) makes up the majority of the site. This soil ~ has 0- to 1-percent slopes and is deep and well drained: It is formed in old alluvium deposited by major rivers, in this case, the South Platte River. The surface layer of i Altvan soils is typically grayish -brown loam approximately 10-inches thick. The subsoil is approximately 15-inches thick and consists of brown and light yellowish brown clay loam 1 and sandy clay loam. Permeability is moderate as is available water capacity. Effective rooting depth is approximately 20 to 40 inches. Additionally, for Altvan soils, surface runoff is slow and erosion hazard is low. Altvan soils are osed almost exclusively for irrigated craps and .are -well suited to corn, sugar beets, beans, alfalfa, small grain, potatoes and onions (commonly grown crops for the area). it has.a fair to good rating . I potential for urban and recreational development, with the shrink-swell potential of the ` subsoil and rapid permeability of the sand and gravel substra#um being the main limiting I~ features (USDA, SCS). Aquolls and Aquents (indicated as "3" on Exhibit I-1) can be found in the western portion of the site. This soil consists of gravely substratum and is deep and poorly drained. It occurs on bottomiands and floodplains of major streams. Aquolls make up approximately 60 percent of this unit and have a dark colored surface layer. Aquents make up approximately 35 percent and have a lighter colored surface layer. The ~ ~ remaining 5 percent consists of Aquepts and Bankard sandy loam. Most of the area is subject to flooding. Additionally, these soils have a mottled, mildly alkaline to moderately alkaline loamy or clayey surface layer and underlying material. They are underlain by I . I i sand and gravel within 48 inches. Uses for this soil include rangeland and wildlife habitat. Potential native vegetation is dominated by alkali sacaton, switchgrass and I I Heit Sand •and Gravel Mine 02044 SW Meadow, LLC February 2003 17 • i