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1 <br /> <br /> <br /> <br />1 <br /> <br />1 <br />1 <br /> <br /> <br />1 <br />1 <br /> <br /> <br /> <br />1 <br />1 <br /> <br /> <br /> <br />to be deposited alluvially from small streams and their localized <br />flood plains on the terrace top. The other predominant <br />overburden gravelly loam material was formed from the drift, <br />outwash, and old alluvial stream deposits form Quaternary Period <br />glaciers in the area. The primary constituent in the gravelly <br />loam deposit is igneous rocks that can be interpreted as being <br />transported form the San Juan Mountains. The sand, gravel and <br />cobbles "pit run" with some clay lenses below the described <br />overburden is the focus of the mining operation. It should be <br />interpreted as being derived from glacial terminal, lateral, or <br />ground moraines. The glaciers in the area formed in the great <br />Ice Age, in the Pleistocene Epoch of the Quaternary Period. <br />Locally, the mined deposit could have been place by glaciers <br />deriving from the San Juan, Uncompaghre, or a combination of <br />both. The clay lenses incorporated in the "pit run" material <br />could be caused by periods when the glaciers were in remission or <br />stagnation when outwash alluvial deposition predominated. The <br />deposit probably consisted of mixed materials including: <br />metamorphics, quartzite, gneiss, schist, and slate; Igneous: <br />andesite and rhyolite, breccia, tuff, and ash; sedimentary: <br />sandstone, limestone, siltstone, mudstone and conglomerate. <br />Geologic Hazards <br />There is no geologic hazards present on United Companies, Inc. <br />Norwood Gravel Pit such as rock falls or landslides. The mesa <br />that it is on is gently sloping to flat, and the main drainage to <br />the southwest is gently sloping as well. The San Miguel Canyon <br />rim is located approximately 2500' northwest of the pit, <br />therefore, no hazards are anticipated with this structure. There <br />is no water table present at the pit's deepest level (50') so <br />water movement problems are not anticipated. There is no steep, <br />high ground in the immediate area that could be a site for an <br />avalanche. Lastly, the pit is not located in a flood plain or <br />has the potential for flooding. <br />8 <br />