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information on the subsurface materials encountered during the installation of the wells, <br />the total depth of the well and the depth to ground water measured during well <br />installation (Table 1). Figure 1 shows the approximate location and total depth of the <br />wells and the depth to water in the wells. Copies of the well records aze presented in <br />Appendix A. <br />Table 1. Water Well Information <br />Well Owner Subsurface Materials Total Well Depth To Water <br /> Depth (feet) (feet) <br /> 0-70' Gravel & boulders <br />Daniel & Donna Hahn 75 60 <br /> 70-75' Gray Shale <br /> 0-72' Gravel & boulders <br />Mazk & Lisa Mirabito 75 60 <br /> 72'-75' Gray shale <br /> 0-62' Gravel & boulders <br />William & Jill Hansen 150 55 <br /> 62'-150' Blue shale <br /> 0-70' Gravel & boulders <br />William Spurlin 105 65 <br /> 70'-105' Green shale <br /> 0-63' Gravel & boulders <br />Billy Goodwin 105 60 <br /> 63-105' Green shale <br /> 0-58' Gravel & boulders <br />Lilbum & Joan Holley 75 55 <br /> 58'-75' Green shale <br />Source: Colorado Division of Water Resources <br />The well records indicate that the thickness of the sand, gravel and cobble deposits <br />increases to the east of the existing gravel pit to about 75 feet. Precipitation infiltrates <br />these deposits and accumulates on top of the shale bedrock to a depth of 55-65 feet below <br />the ground surface. All of the water wells in the area aze supplied primarily by the <br />ground water in these deposits of sand, gravel and cobble. Based on a review of the <br />regional topography, ground water in the azea flows to the west towazds the Fraser and <br />Colorado Rivers. Therefore the proposed gravel pit expansion would be down-gradient <br />to cross-gradient of the surrounding water wells. <br />Conclusions and Recommendations <br />Based on the site reconnaissance and review of well records, it is ERO's professional <br />opinion that the proposed expansion of the gravel pit will not adversely affect the quality <br />or quantity of the ground water supplying the surrounding water wells. The plan for the <br />gravel pit expansion is to remove sand, gravel and cobbles to a similaz depth as the <br />existing pit. The new pit will not extend below the water table and therefore there will be <br />no direct impact to the ground water aquifer. Rechazge to the aquifer used by the <br />ERO <br />Reswras <br />[orporalion <br />