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SECTIONTWO mtroduct~on <br />This report presents the results from Part 1 -Design Phase as described in the URS proposal <br />submitted to Platte Sand & Gravel on August 8, 2005. The Design Phase consists of an <br />investigation and study conducted at the proposed gravel pit and future water storage reservoir <br />designated as Shazkey's Lake to evaluate the geology and geotechnical conditions at the site. <br />Based on the results of the investigation and analyses, recommendations aze presented in order to <br />prepare the site for use as along-term water storage reservoir. <br />2.1 SCOPE OF PROJECT <br />This phase of the project consists of a geotechnical field investigation, laboratory analyses, and <br />seepage analyses. Specifically, the scope of work included in this report includes the following: <br />• Performing a subsurface exploration to evaluate soil, bedrock, and borrow sources. <br />• Obtaining groundwater samples. <br />• Conducting a laboratory testing program and cutoff wall backfill mix design. <br />• Evaluating pertinent engineering characteristics of the subsurface materials. <br />• Conducting seepage analyses to evaluate the suitability and performance of the proposed <br />cutoff wall. <br />• Preparing a geotechnical design report including plans and specifications. <br />2.2 BACKGROUND AND PROJECT DESCRIPTION <br />Currently, Platte Sand and Gravel has a permit to mine approximately 800 acres on the northeast <br />side of the South Platte River. The mine is subdivided into numerous gravel pits that, at the <br />conclusion of mining, will be converted to water storage reservoirs. As explained above, this <br />report addresses the Sharkey's Lake Gravel Pit, which will be mined and converted to a water <br />storage reservoir. Accordingly, Platte Sand and Gravel plans to construct asoil-bentonite cutoff <br />wall around the perimeter of Shazkey's Lake as presented in Drawings 1 through 4. The purpose <br />of the cutoff wall will be to reduce the amount of seepage and subsequent dewatering required <br />during mining and, upon completion of mining, to meet reservoir lining criteria for gravel lake <br />water storage reservoirs that satisfy the Colorado Division of Water Resources, State Engineers' <br />Office (SEO). <br />N*:I'PR~OJEC~TS2223B240 PLATTE SAND GRAVELISUB 00\120 WORD PROC\PLATTESANDSGRAVELGEOTECHNICALDESIGNREPORT4.ODOC115-NOVAS\ 2-1 <br />`/~ _ _ _ _ <br />