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<br />~' <br />~, <br />i <br /> <br /> <br /> <br /> <br />I <br /> <br /> <br /> <br />1 <br /> <br /> <br /> <br /> <br /> <br /> <br />(4) Claystone (Bedrock): The bedrock was encountered in Borings 4 <br />at a depth of sixty-five (65) feet and extends to greater <br />depths. The upper two (2) feet of the bedrock is highly <br />weathered; however, the underlying claystone is firm. <br />(5) Groundwater: At the time of the investigation, free groundwater <br />was encountered at depths of five (5) to ten (10) feet below <br />the surface. Water levels in this area are subject to change <br />due to seasonal variations, irrigation demands on or adjacent <br />to the site, and the volume of flow in the Cache la °oudre <br />River. <br />DISCUSSION <br />Over fifty (50) feet of sand and gravel consisting of fragments of <br />quartz and igneous and metamorphic rock carried by the river from the <br />mountains to the west was encountered in the test borings. These materials <br />appear to be hard and durable. When properly screened and/or crushed, <br />the sand and gravel should be suitable for use in construction materials <br />such as concrete, asphalt, subbase, base course and fill material. <br />The quantity of gravel at the site is in excess of seven million <br />(7,000,000) cubic yards. We estimate that one-half million (500,000) <br />cubic yards of overburden will have to be removed to obtain the gravel. <br />The above quantities were determined by use of a planimeter, assuming an <br />average gravel thickness of fifty (50) feet. Since the majority of the <br />gravel was encountered below groundwater, the quarry will either have to <br />be dewatered or the gravel will have to be removed by use of a drag <br />line. <br />GENERAL COMMENTS <br />The gravel quantities determined are based upon the data obtained <br />in the test borings at the locations indicated on the Test Boring Location <br />-3- <br />