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2 Controls on Groundwater Levels <br />A better understanding of the controls on groundwater levels in the area of the Stegner Farm <br />gravel mine has been developed since the preliminary evaluation of gro~mdwater conditions was <br />performed in May 2001. Based on the existing groundwater monitoring data, visual observations, <br />and climatic data obtained from the Colorado Climate Center for Fort Collins, Colorado, four <br />principal controls on groundwater levels in the area of the Stegner Farm gravel mine have been <br />identified. These controls include: <br />• The local climatic conditions (precipitation, temperature, and evapotranspiration); <br />• The occurrence, pattern and period of irrigation; <br />• The slurry wall surrounding the Stegner Farm gravel mine; and <br />• Groundwater withdrawals from local wells and dewatering operations. <br />The effect of each of these controls will be discussed in the following sections. <br />3 <br />