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GROUNDWATER EVALUATION FOR PROPOSED HEIT AGGREGATE <br />OPERATION, WELD COUNTY, COLORADO <br />1.0 INTRODUCTION/PURPOSE <br />This report, which was completed by Wright Water Engineers, Inc. and Calibra Consulting, LLC, <br />presents the results of an evaluation of potential effects on groundwater and neazby water wells <br />from proposed mining of the Heit Pit in Weld County. Water wells on the Aquatic and Wetland <br />Company (AWC) nursery immediately to the north are addressed, in particular. This report was <br />prepared based on our proposal to you dated December 13, 2002. <br />This evaluation is based on information provided by Banks and Gesso, LLC on the nature of the <br />proposed project, review of existing information for the project area, observations of the study <br />area, and our experience with similaz projects in the past. A limited amount of field data was <br />reviewed for this study, and no additional field measurements were specifically taken. The <br />results of this evaluation may change based on collection of additional site-specific information. <br />2.0 STUDY AREA DESCRIPTION <br />The proposed Heit Pit property consists of approximately 110 acres located in the E %z of <br />Section 13, T. 2 N., R. 67 W. in Weld County. Figure 1 is a vicinity map of the property <br />Figure 1 shows the property boundary, proposed limits of mining, and features relevant for this <br />study in the vicinity of the property. The South Platte River is located to the east of the site, with <br />the closest point of the river approximately 200 feet from the proposed pit. A residence and <br />small lake (likely a reclaimed aggregate pit) are present east of the site. Another small lake <br />associated with another residence exists southwest of the property. The Lupton Meadows Ditch, <br />which parallels Little Dry Creek, flows immediately west of the site, and the Meadow Island <br />Ditch is a short distance to the west. Wetlands exist along both of these ditches. The Koenig Pit, <br />which was reportedly lined with a slurry wall and excavated by Weld County, exists immediately <br />to the south of the proposed Heit Pit. <br />021-110.030 Wright Water Engineers, Inc. Page 1 <br />March 2003 <br />