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authorized by the landowner. Mining and processing will take place year- round, <br />as weather and site access conditions allow. <br />(f) In addition to the exhibit map in Exhibit C, the following information is available <br />for the project site: <br />(i) The source unit to be mined for sand and gravel is the Quaternary, <br />Upper Pleistocene, Alluvium four of the Uncompahgre River (Qau4). <br />The unit reaches a maximum thickness of 150 feet in the region. The <br />unit consists of gray to brown, moderately sorted, glacio- fluvial <br />terrace deposits of gravels to cobbles in coarse sand overlain by up to <br />4 feet of fine grained loess sediments. The Operator estimates that a <br />total depth of up to 25 feet of Alluvium four will be mined during the <br />planned thirty (30) years of operation. <br />(ii) The Alluvium four unit is underlain by the Quaternary, Middle <br />Pleistocene, Alluvium five, Uncompahgre River deposits. Maximum <br />thickness of the Alluvium five unit in the referenced area is 250 feet. <br />REFERENCE: Geologic Map of the Hoovers Corner Quadrangle, Montrose <br />County, Colorado, J.L White, F.J. Williams, M.L. Morgan and S.M. Townley, <br />2008, Colorado Geological Survey, Open -File Report 08 -03 <br />(g) The primary commodities to be mined are sand and gravel for use in <br />manufacturing road base and structural fill for Montrose County road and bridge <br />projects. <br />(h) No incidental products to be mined or extracted are anticipated at this time. <br />(i) The sand and gravel to be mined can be excavated with equipment and will not <br />require blasting to extract material for processing. Therefore, no impacts from <br />blasting will be experienced by adjoining landowners. <br />Neal Pit — Permit Amendment <br />Exhibit D <br />