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<br />2. PROJECT DESCRIPTION AND LOCATION <br />~i <br />As presently envisioned, Trout Creek Dam will be a 70-foot high <br />roller-compacted concrete (RCC) structure located on the east side of <br />the Upper Arkansas Valley about 3.3 miles southeast of Buena Vista, <br />Chaffee County, Colorado. Geographic coordinates of the dam site aze <br />106.084° W longitude and 38.806° N latitude. <br />The dam site is located neaz the topographic transition between the <br />broad, relatively flat Arkansas River Valley and the western flank of <br />the Arkansas Hills, the southern continuation of the Park Range uplift <br />in central Colorado. The Collegiate Peaks of the Sawatch Range, <br />reaching elevations of 14,000+ feet, bound the westem side of the <br />Arkansas Valley near Buena Vista. Elevations in the dam site area <br />range from about 7800 feet where Trout Creek enters the Arkansas <br />Valley to over 9000 feet in the higher terrain in the reservoir basin. <br />Slopes in the project azea vary from rugged and steep at the dam site to <br />relatively gentle to almost flat near the Arkansas River. <br />3. PREVIOUS WORK -REGIONAL SEISMOTECTONIC STUDIES <br />Since 1962, potential earthquake hazards in Colorado have become the <br />subject of increasing interest and study. Much of the early interest in <br />seismic hazards stemmed from a persistent series of earthquakes <br />associated with a deep, waste-injection well at the Rocky Mountain <br />Arsenal northeast of Denver. Cessation of pumping at the azsenal well <br />in the late sixties, however, caused a sharp decline in both the number <br />of earthquakes felt in the Denver area and the interest of the local <br />scientific(technical community. <br />The earthquake hazazd question was revitalized by publication of <br />several papers in the early to mid-1970s including those by Scott <br />(1970), Tweto and others (1970) and Matthews (1973). Scott (1970) <br />of the U.S. Geological Survey (USGS) reported eight faults in east- <br />central Colorado with appazent Quaternary movement (<1.9 million <br />years before present [mybp]). Four of these faults were along the <br />Colorado Front Range. Tweto and others (1970), also of the USGS, <br />5 <br />