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<br />.- <br />Earth Engineering Consultants, Inc. <br />EEC Project No. 1082030 <br />Turnpike Reservoir -Feasibility Study <br />May 5, 2008 <br />Page 6 <br />This interpretation was carried out by borehole information and review of existing published <br />works including the following: <br />1. Myers, A.R, Hansen, J.B., Lindvall, R.A., Ivey, J.B, and Hynes J.L. Coal Mine <br />Subsidence And Land Use In The Boulder-Weld Coalfield Boulder And Weld <br />Counties, Colorado, Colorado Geological Survey, 1975, Environmental Geology 9 <br />2. Soil Survey of Weld County Area, Colorado, USDA and SCS, 1980. <br />3. Tweto, Ogden. Geologic Ma of Colorado, USGS, 1979. <br />GROUNDWATER CONDITIONS <br />Observations were made while drilling and several days after completion of the borings to <br />detect the presence and depth to hydrostatic groundwater. At the time of our field <br />exploration, and when checked several days after drilling, free water was observed in the <br />majority of the test borings at depths of approximately 8 to 22-feet below site grades. <br />Zones of perched and/or trapped groundwater may occur at times in the subsurface soils <br />overlying bedrock, on top of the bedrock surface or within permeable fractures in the bedrock <br />materials. The location and amount of perched water is dependent upon several factors, <br />including hydrologic conditions, type of site development, irrigation demands on or adjacent <br />to the site, and seasonal and weather conditions. These observations represent groundwater <br />conditions at the time of the field exploration, and may not be indicative of other times, or at <br />other locations. <br />Fluctuations in groundwater levels can occur over time depending on variations in hydrologic <br />conditions, and other conditions not apparent at the time of this report. Monitoring in cased <br />borings created from the infiltration of surface water would be required to more accurately <br />evaluate the depths and fluctuation in groundwater levels. <br />As part of this feasibility study, at a later date, EEC intends on drilling a minimum of four (4) <br />additional borings and installing PVC-cased groundwater piezometers for purposes of long-