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1 <br />1.0 Introduction <br />Southdown, Inc., a corporation doing business in the State of <br />Colorado as Southwestern Portland Cement Company, owns and <br />operates a cement manufacturing plant and associated quarries two <br />miles east of Lyons, in unincorporated Boulder County. The <br />existing quarries are nearing the end of feedstock production, <br />and Southdown will open new quarries one mile north of the plant <br />at a location known as Dowe Flats. Accordingly, the new quarry <br />is called the Dowe Flats Project (Project). The Dowe Flats <br />quarries are planned to provide feedstock for the plant for 25 <br />years .' <br />The mine quarries and associated topsoil and waste rock <br />stockpiles include an impact zone of 385 acres. The 1,955 acre <br />mine permit boundary includes the impact zone and an undeveloped <br />and undisturbed buffer zone. <br />The area known as the Dowe Flats project site is located east and <br />north of Lyons, Colorado and west of Longmont, Colorado. Rabbit <br />Mountain borders the Study Area on the east, the St. Vrain Creek <br />is the border on the south and Indian Mountain borders the <br />project area to the west. The Dowe Flats topography is flat to <br />rolling with an elevation of approximately 5200 feet at the <br />southeast corner to 5500 feet at the northern border. The Supply <br />Canal, the Highland Ditch, the Rough and Ready Ditch and the <br />Palmerton Ditch provide water and cross the Flats in a generally <br />west to easterly direction. Several springs are located near <br />Rabbit Mountain. (See Figure I). <br />'For additional detail the reader is referred to the Dowe <br />Flats Permit Documents including the Boulder County Special Use <br />Permit Application (1993), the Colorado Mined Land Reclamation <br />112 Permit Application (1993) and Supplemental Technical <br />Appendices (1993). <br />