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Earth Engineering Coixultant,,,LLC <br /> EEC Project No. 1122096 <br /> Signal Resen�oir Improvements <br /> August 5,2015 <br /> Page 6 <br /> GEOLOGY REVIEW <br /> Signal Reservoir No. 1 is located in the Northwest Quarter of Section 4, Township 1 South, <br /> Range 67 West of the 6"' Prime Meridian, Adams County, Colorado. The site geology presented <br /> in this report is based upon the acquired field data, review of the available literature and maps, <br /> and previous experience with similar geologic conditions in this area. The locations of geologic <br /> features are approximate and should be considered accurate only to the degree implied by the <br /> methods used to make those measurements. <br /> The project site lies in the Colorado Piedmont Section of the Great Plains Physiographic <br /> Province. The sediments which compose the Colorado Piedmont were formed when uplift of the <br /> present day Rocky Mountains in Eocene-Late Cretaceous times (30-70 million years ago) <br /> produced a large increase of stream sediments resulting in deposition of sediments on the flanks <br /> next to the mountain belt and outlying areas. The Colorado Piedmont is an elongated trough in <br /> the Great Plains, adjacent to the Front Range of the Southern Rockies. The Colorado Piedmont <br /> was formed when uplift of the area in Miocene times (5-20 million years ago) produced an <br /> increase of stream erosion resulting in scouring next to the foothills and outlying areas. The <br /> Piedmont is bordered by the southern Rockies to the west, Great Plains escarpment to the <br /> northeast, and Palmer Divide to the south. <br /> Structurally, the site lies within the Denver Basin, a thick accumulation of Paleozoic and <br /> Mesozoic Era sediments involved with down-warping in the basin area and uplift of the adjacent <br /> highlands. Small anticlinal folds occur adjacent to the Front Range. It is our understanding that <br /> faulting has not taken place in the recent historic past in this area. <br /> The U.S Geological Survey describes the bedrock underlying the site consisting of the Denver <br /> (Paleocene and Upper Cretaceous) and Arapaho (Upper Cretaceous) Formation (TKda). The <br /> Denver and Arapaho Formation generally consists of claystone and siltstone with interbedded <br /> sandstone containing several coal seams. The bedrock is covered by alluvial, mixed alluvial and <br /> Aeolian deposits. <br />