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It <br /> <br /> performed to determine the location and quantity of available sources of fine material <br /> (containing primarily clayey and silty material) for slurry wall construction. <br /> The first phase of the investigation consisted of performing reconnaissance to <br /> determine several possible clay borrow sources within and surrounding the project <br /> site. Identified sources include the following locations: <br /> ^ Clay waste from the 35~' Avenue gravel pi[ operated by Lafarge. <br />^ Stockpiled material on the north side of the Cache la Poudre River, directly <br /> north of the site on Flatirons' property, <br /> ^ Stockpiled material located [o the east of the City's property. <br />^ Stockpiled material located on the southeast corner of the City's property. <br /> ^ Overburden material existing in the embankment between [he two ponds in <br /> the City's property. <br /> The second phase of the investigation consisted of sampling and determining the <br /> characteristics of the material at three of these locations that were determined to be <br /> viable sources by performing test pits. <br /> ^ Stockpiled material on the north side of the Cache la Poudre River. (eight <br /> pits) <br /> ^ Stockpiled material located on the southeast corner of the City's <br /> property.(four pits) <br />r ^ Overburden material existing in the embankment. (two pits) <br />Test pit locations south of the river are shown on Figure 3. Laboratory analyses were <br />performed on the collected samples. Results from this second phase indicated that the <br />stockpile and the embankment, both within the City's property boundary, consisted of <br />overburden deposits suitable as a clayey or silty material. <br />The third phase of the investigation consisted of determining the overall quantity and <br />homogeneity of available material at these two locations. Eight additional test pits <br />were performed along both sides of the embankment. A sample was collected from <br />each test pit. Information from these test pits was combined with topographic <br />information to estimate the available quantities of clayey or silty material. <br />F. Reconnaissance of Surrounding Subsurface Conditions <br />Observations were made by a Haley & Aldrich representative of soil and bedrock <br />conditions at the exposed mined highwall of the water filled gravel pit located to [he <br />east of the site and the main pit of the 35°i Avenue gravel pit mine located on the west <br />side of 35'" Avenue. <br />