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Blasting Impacts and Rock Slope Stability Assemment for Cottonwood Quarry in Grand Conaty, CO <br />5.0 STABILITY OF AIMD ROCK SLOPES <br />Inspection of area outcrops of rock indicate that the igneous rock at the site, believed to be <br />Granodiorite or Andesite, reveals that the rock is very competent and not deteriorated by <br />weathering or chemical effects. The near -vertical slope of near -by rock projections suggests that <br />stable rock walls can be mined in this rock. <br />Joints observed in outcropping rock were tight and cemented. No rock borings have been done <br />and no rock slopes are exposed within the proposed mining permit area Hence, the author's <br />opinion about the stability of future mined rock walls is very general and is not supported by any <br />evaluations of actual data regarding the physical and structural properties of the rock at the <br />Cottonwood site. <br />If quarry development plans proceed, it would be wise to examine subsurface rock conditions by <br />doing some test excavations and rock borings. <br />6.0 FIIMINGS <br />1. The author finds absolutely no issue that could prevent the execution of physically safe <br />and environmentally compliant blasting operations at the Cottonwood Quarry. <br />2. Preliminary inspections of the condition exposed area rock outcrops indicate that stable <br />blasted rock slopes can be developed at the Cottonwood Quarry Site. <br />REVEY Associates, Inc. Page I8 April 2OD4 <br />