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Kid <br /> 1 INTRODUCTION <br /> 1.1 BACKGROUND <br /> This report presents a summary of data evaluation, description of the hydrogeology, and potential <br /> impacts to surface and ground water systems resulting from the proposed Hitch Rack Ranch <br /> (HRR) Quarry. The purpose of this report is to support a Colorado Division of Reclamation <br /> Mining and Safety(CDRMS)mining permit and an El Paso County Special Use Permit(SUP)for <br /> the quarry. <br /> The proposed HRR Quarry is located approximately 14 miles southwest of Colorado Springs in <br /> El Paso County. The HRR encompasses approximately 1,432 acres in Sections 15, 16, 21, 22, 23 <br /> and 27 of Township 16 South, Range 67 West of the 6th P.M. Based on the available geologic <br /> mapping and information provided by Transit Mix,the proposed quarry will target the production <br /> of aggregate quality granitic material located in Section 16. The locations of the HRR property <br /> and the proposed quarry are presented in Figure 1-1. <br /> 1.2 EXECUTIVE SUMMARY <br /> • The operation of the proposed HRR quarry will have minimal effects on surface or ground water <br /> resources within the Little Turkey Creek (LTC) watershed. Little Turkey Creek is the primary <br /> drainage within the property. There are no hydrologic impacts projected outside of the LTC <br /> watershed. Potential impacts to ground water are very small and will be recognized gradually <br /> over the 40 years of quarry operations. Established monitoring will provide ample time to ensure <br /> that proposed remedies can be implemented to avoid disruption to the few wells near the quarry. <br /> • An assessment of the existing hydrogeologic conditions demonstrates that ground water occurs in <br /> fractured granitic bedrock within the LTC watershed west of the Fault zone that separates granitic <br /> bedrock from the sedimentary Fountain Formation. The most active groundwater flow in the <br /> granitic rocks is within the more highly fractured zone underlying Little Turkey Creek. <br /> • The granodiorite in the south ridge, although fractured, has a very low fracture porosity and very <br /> low bulk permeability. Calculated average groundwater linear velocity in the south ridge ranges <br /> between 11 to 90 ft/yr. The travel time for groundwater to flow from the ridge to Little Turkey <br /> Creek, a distance of about 4,000 ft, is between 44 and 355 years. <br /> • West of the West Geological Fault, groundwater flow within fractured bedrock tends to be from <br /> the ridge areas towards the Little Turkey Creek fracture zone and then eastwards along the LTC <br /> fracture zone. Groundwater levels within the LTC fracture zone indicate a component of <br /> discharge to surface water and Little Turkey Creek gains surface water flow overall along this <br /> reach, even though there are gaining and losing sections within this reach. <br /> TRANSIT MIX-HITCH RACK RANCH <br /> HYDROGEOLOGY AND IMPACT ANALYSIS <br /> 1-1 <br />