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<br />Geotechnical Engineering Exploration <br />Hall-Irwin Construction Company <br />Project No. 21975089 <br />Selected soil samples were tested for the following engineering properties: <br />• Water content <br />• Grain size distribution <br />• Plasticity Index <br />The significance and purpose of each laboratory test is described in Appendix C. <br />Laboratory test results are presented in Appendix B. All laboratory tests were performed in <br />general accordance with the applicable ASTM, local or other accepted standards. <br />SITE CONDITIONS <br />The site is presently utilized as agricultural land for wheat and corn crops, as well as for <br />cattle grazing. The site consists of gently rolling ter'ain with surface drainage primarily in <br />the south to southwest directions. The site is located approximately 1/4 to 1/2 mile east of <br />[~ Interstate 25 on the north side Weld County Road 24. North and east of the site is vacant, <br />l undeveloped agricultural land and west is another gravel pit operation utilized by others. <br />Located on the south central portion of the site is an existing fans house, outbuildings, and <br />various corals. Various irtigation laterals and irtigation ditches were encountered <br />meandering throughout the site. <br />SUBSURFACE CONDITIONS <br />Geology <br />The proposed area is located within the Colorado Piedmont section of the Great Plains <br />physiographic province. The Colorado Piedmont, formed during the Late Tertiary and <br />Early Quaternary time (approximately 2,000,000 years ago), is a broad, erosional Vench <br />which separates the Southern Rocky Mountains from the High Plains. Structurally, the site <br />lies along the western flank of the Denver Basin. During the Late Mesozonic and Early <br />Cenozoic Periods (approximately 70,000,000 years ago), intense tectonic activity occurred, <br />causing the uplifting of the Front Range and associated downwarping of the Denver Basin <br />to the east. Relatively flat uplands and broad valleys characterize the present-day <br />topography of the Colorado Piedmont in this region. <br />3 <br />