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Groundwater Evaluation For Proposed Heit Aggregate Operation <br />Weld County, Colorado <br />The modeling focused on the well immediately north of the proposed pit, which is the well most <br />likely to be affected by the pit. However, the modeling results (Figure 3) indicate that the <br />proposed pit should have minimal effect, if any, on other water wells in the azea. <br />The modeling and conclusions in this study aze based on a limited amount of site-specific <br />information. The model could be refined through incorporation of additional data from the site <br />and surrounding area and calibrated based on observed water levels. <br />An unlined excavation in the northwest corner, as may occur, was not included in the modeling. <br />If the applicant decides to excavate this azea, the resulting pit would be relatively small <br />(< 7 acres.) This excavation would not be expected to have any significant effect on groundwater <br />levels in the area due to the relatively flat slope of the water table. Groundwater would be <br />increased slightly north of the excavation and lowered slightly south of the excavation due to <br />"lake leveling" effects of the pit. <br />6.0 RECOMMENDATIONS FOR MITIGATION OF IMPACTS <br />This study found that the proposed Heit Pit should not have a significant effect on water wells on <br />the AWC nursery or in the vicinity of the operation, so measures to mitigate impacts from the pit <br />are not warranted. However, it is recommended that water levels be measured in the wells on the <br />AWC nursery and any other wells of concern in the area prior to and during construction of the <br />pit. This is recommended in order to establish pre-mine groundwater levels in the wells <br />(especially under the current drought condition) and to assess any potential' impacts from the <br />proposed pit. <br />021-110.030 Wright Water Engineers, Inc. Page 6 <br />March 2003 <br />