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Denver Brick Company AEE Project E95-7084 <br />Stevens Lease Ctay Mine January 8, 1996 <br />Douglas County, Colorado Pape (51 <br />4.3 Impacts on Adioinina Lands <br />Physical impacts to adjoining lands will be limited to the mine access road corridor. There will <br />be no off-site impacts to cultural, wildlife, or environmental resources. Noise and air quality <br />will be addressed at the property line in accordance with Colorado State requirements for <br />permissible noise levels. A traffic and transportation plan to address impacts to Crowfoot <br />Valley Road is provided under separate cover. <br />The access road will be a private road intersecting Crowfoot Valley Road, by permission of <br />the land owner. The access road is a currently existing road serving the agricultural lessee <br />of the adjoining Stevens property. Any modifications and extension to the road are addressed <br />in a drainage and engineering report (including erosion and sediment control) provided under <br />separate cover. <br />Impacts and compatibility with the surrounding low density land uses are discussed in Section <br />4.4.5 of this application. <br />4.4 Compliance with Douglas Countv Master Plan <br />Long range planning regarding mineral extraction and its impacts within Douglas County are <br />addressed by the Master Plan for Mineral Extraction (adopted July 9, 1990) and adopted by <br />reference January 27, 1992 to the overall Douglas County Master Plan. This narrative <br />evaluates the proposed clay mine based on the July, 1990 Mineral Extraction master plan and <br />other elements of the Douglas County Master Plan. <br />4.4.1 0l0 <br />Geologic information pertaining to the proposed mine site is extracted from the Mineral <br />Extraction Plan geology description, as applicable, and from Description of the Cast/e Rock <br />quadrang/e, Co/orado, G. B. Richardson, U. S. Geological Survey Geological Atlas Folio No. <br />198, Map, 1:125,000, 1915. <br />The proposed mine site, like much of Dcuglas County east of the Front Range, is underlain by <br />the Dawson Formation (Richardson, G. B., 1915). The upper Dawson Formation (Paleocene <br />and Eocene ages) is yellowish-gray tolight-gray, commonly ironstainedcoarse-tofine-grained, <br />locally conglomeratic, massive to crossbedded, argillaceous arkose (rocks composed of <br />appreciable clay minerals which have been altered from feldspar), and feldspathic sandstone <br />containing many lenses of clay. A regional aquifer, the upper Dawson Formation has been <br />historically mined for its clay deposits in Douglas County. <br />The proposed mine site specifically is underlain by Dawson Arkose, a varicolored arkosic <br />conglomerate, sandstone, and shale with interbedded andesitic sandstone. While sandstone <br />predominates, local bodies of clay occur throughout. The prevailing color of rock is whitish, <br />due to quartz and feldspar. When the feldspars are ironstained, the clays are brilliantly colored <br />in some places with various shades of red and yellow (or rusty tones). Pronounced <br />irregularities in the arrangement and sequence of the deposits is characteristic of the Dawson <br />Arkose. Abrupt changes in composition and texture are common. (Richardson, G. B., 19151 <br />~AGRR. <br />Earth & Environmental <br />