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<br />I <br />lee <br />! <br />I <br />I <br />I <br /> <br />, <br /> <br />l <br />, <br />, <br />I <br />I <br /> <br />'fe <br /> <br />~ <br /> <br />lee <br />[ <br /> <br />4.0 SITE CONDITIONS <br /> <br />4.1 Existing Site Conditions <br />Cotter Corporation's Schwartzwalder Mine is located near Ralston Creek <br />approximately six miles northwest of Golden, Colorado. The mine surface <br />facilities are located in the southeast quadrant of Section 25, Range <br />71W, Township 2S. The site is shown on the Location Map, Figure 1. <br /> <br />The facilities are located on the west bank of Ralston Creek, about two <br /> <br />miles upstream of Ralston Reservoir. Ralston Creek is deeply incised into <br /> <br />the surrounding mountains; the valley is approximately 6,600 feet wide at the <br /> <br /> <br />crest and 1,200 feet deep at the mine site. Ralston Creek has been determined <br /> <br />by the State of Colorado Water Qual ity Control Commission to be a stream <br /> <br />with a 7Q10 of zero. The creek drains approximately 38.7 square miles of <br /> <br />mountainous watershed at the mine site. <br /> <br />The valley floor width ranges from 60 feet to 300 feet at the mine site. <br />The original alluvial valley has been covered with fill to form a pad for <br />mine facilities. Ralston Creek has been constrained by the fill to flow on <br />the east side of the valley adjacent to the east bank. The original location <br />and channel of Ralston Creek has been altered by mine facility construction <br />over the years. <br /> <br />4.2 Watershed Description and Hydrology <br /> <br />The Ralston Creek watershed at the mine site is composed of approximately <br /> <br />38.7 square miles of forested mountainous watershed. The watershed is shown in <br /> <br />Figure 2. Elevations range from 10,500 in the western mountains to approxi- <br /> <br />4-1 <br />