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fi <br />1 <br />Earth Engineering Consultants, Inc. <br />EEC Project No. 1082030 <br />Turnpike Reservoir -Feasibility Study <br />May 5, 2008 <br />Page 3 <br />Moisture content tests were completed on each of the recovered samples. In addition, the <br />unconfined strength of appropriate samples was estimated using a calibrated hand <br />penetrometer. Atterberg Limits and washed sieve analysis tests were completed to evaluate <br />the quantity and plasticity of fines in the subgrade samples. Swell/consolidation tests were <br />completed to evaluate the potential for the subgrade materials to change volume with <br />variation in moisture and load. Additional laboratory testing procedures included moisture- <br />density relationship/standard Proctor density, and falling head permeability characteristics. <br />Results of the outlined tests are indicated on the attached boring logs and summary sheets. <br />As part of the testing program, all samples were examined in the laboratory by an engineer <br />and classified in accordance with the attached General Notes and the Unified Soil <br />Classification System, based on the soil's texture and plasticity. The estimated group symbol <br />for the Unified Soil Classification System is indicated on the boring logs and a brief <br />description of that classification system is included with this report. Classification of the <br />bedrock was based on visual and tactual observation of disturbed samples and auger cuttings. <br />Coring and/or petrographic analysis may reveal other rock types. <br />SITE AND SUBSURFACE CONDITIONS <br />The proposed reservoir development project is located northeast of the intersection of County <br />Line Road/Weld County Road 1 and Highway 52 in Weld County, Colorado. The site was <br />formerly a sand and gravel mine site with an approximate 32-acre reclaimed, unlined "lake." <br />The site is currently being considered for development of an approximate 800 to 1,000 acre- <br />foot reservoir. ASCI presently mines portions of the site. Various construction/production <br />related equipment such as scales, conveyors, tanks, and stockpiles of a variety of materials <br />surround the previously mined areas. Boulder Creek is located along the western boundary <br />of the site and flows in the northeast direction. In general, the topography at the site slopes in <br />the north to northeast direction, with an estimated relief of about 15-feet. <br />An EEC field engineer was on site during drilling to evaluate the subsurface conditions <br />encountered and direct the drilling activities. Field logs prepared by EEC site personnel were <br />based on visual and tactual observation of disturbed samples and auger cuttings. The final