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Blasting Impacts and Rock Slope Stability Assessment for Cottonwood Quarry in Grand County,CO <br /> 1.0 INTRODUCTION AND SCOPE <br /> Richard Linke plans to develop a rock quarry in Grand County on land located west of Granby, <br /> Colorado. The planned permit area, shown in Figure 1, covers approximately 80 acres of land <br /> located adjacent to Grand County Road 55. The land, if developed for aggregate mining and <br /> processing would be leased from the landowner(Carl E. Linke Irrevocable Trust). Investigations <br /> of rock outcrops on the site indicate that the site contains a significant source of igneous rock(> <br /> 30,000,000 tons). High-quality construction aggregate in varying sizes, produced from rock at <br /> this site,could be provided to area construction markets. The name of this proposed operation is: <br /> Cottonwood Quarry. <br /> Rock drilling and blasting methods would be used to fragment and loosen rock at the proposed <br /> Cottonwood Quarry. Preliminary development of the quarry will require the excavations to build <br /> an entry roadway from Grand County Road 55, followed by side-hill excavation work that can <br /> establish room for crushing and conveying equipment, a scale house and processed rock <br /> stockpiles. <br /> The express intent of this report is to: 1) Evaluate all potential impacts of planned rock blasting <br /> work at the Cottonwood Quarry site, and 2) provide a preliminary evaluation of the stability of <br /> rock slope walls. This professional evaluation report is intended to provide a technical <br /> assessment of the environmental impacts of mining and a preliminary opinion about the stability <br /> of mined rock slopes. <br /> On March 12, 2004, Gordon F. Revey (author) inspected the proposed site of the Cottonwood <br /> quarry. Richard Linke of Linke Construction Co.— the Quarry Developer, Stevan O'Brian of <br /> Environment, Inc., and Michael S. Kervin of Gagnon & Hayne Consulting Engineers, Inc. <br /> accompanied the author and pointed out where planned excavations would likely occur_ The <br /> locations of residential properties, roadways, utilities and other facilities in the area, along with <br /> the topography of the site,were also studied during this site visit. <br /> In order to acquaint the reader with general issues associated with blasting work—like ground <br /> vibration, background information about blasting terns and effects, is included in the body of <br /> this report. General information is followed by specific evaluations of potential impacts of <br /> blasting at the Cottonwood Quarry site. <br /> REVEY Associates,Inc. Page l April 2004 <br />