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EVALUATION OF POTENTIAL IMPACTS <br />FROM THE PROPOSED NIX PROPERTY SAND AND GRAVEL <br />OPERATION ON SHALLOW GROUNDWATER LEVELS, <br />WATER WELLS AND WETLANDS <br />1.0 INTRODUCTION/PURPOSE <br />This report presents the results of an evaluation of the potential effects of aggregate mining at the <br />proposed Nix property sand and gravel operation (Nix property) on local groundwater levels, <br />nearby water supply wells and the wetland located immediately to the south on the Sage Hill <br />Farm. This report includes recommended measures to mitigate potential mining impacts to water <br />supply wells and wetlands. <br />This evaluation is based on review of existing information, observations of the study azea and <br />collection of additional data. Additional data includes groundwater level readings from <br />monitoring wells installed in the project area and existing wells in the azea. <br />The initial mining proposal was for dry mining by means of dewatering. However, due to <br />concerns by local property owners, Owens Bros. Concrete Company (Owens Bros.). changed the <br />plan to wet mining. Therefore, this report evaluates the effects of wet mining only. <br />2.0 STUDY AREA DESCRIPTION <br />The Nix property is located in the E%s and S% of the SW'/, of Section 28, T3N, R67W in Weld <br />County, Colorado as depicted on Figure 1. The site consists of approximately 320 acres of <br />imgated agricultural land. <br />The Last Chance Ditch flows in a northeasterly direction immediately to the west of the Nix <br />property. Numerous laterals from the ditch traverse agricultural fields azound the property. The <br />Side Hill Ditch and several laterals serve the Sage Hill Farm immediately south of the Nix <br />property. An irrigation pond exists on the Mayer property immediately to the east of the Sage <br />Hill Farm and wetland evaluated in this report. <br />011-074.000 Wright Water Engineers, Inc. Page 1 <br />Apri12002 <br />