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<br />Rocky Mountain Asphalt <br />January 20, 1989 <br />Page 3 <br />Peak Particle <br />Velocity Range <br />tin/sect <br />< .035 <br />.035 to .225 <br />.225 to .85 <br />.85 to 2.0 <br />> 2.0 <br />Perception <br />Category <br />Imperceptible <br />Barely Perceptible <br />Distinctly Perceptible <br />Strongly Perceptible <br />Severe <br />For the conditions considered in this evaluation, It has been assumed that all <br />vibrations at the Cave of the Winds facility should be within the "Iri]perceptible" <br />to "Barely Perceptible" range. It should be noted that physical damage tD <br />structures and underground openings should not occur at penk particle v~loclt~i~ <br />less than about 2 Inches per second for the range of vibration frequencies <br />expected at the site. As a result, physical damage to the Cave of the Winds <br />facilities is not anticipated. <br />It is our understanding that the Summit Pit will be located in the Pikes <br />Peak granite, while the Cave of the Winds is in the overlying Manltou Springs <br />Limestone east of the site. The exiting Snyder Quarry is located in the Manitou <br />Springs Limestone. Both the gran Re and limestone are generally competent when <br />unweathered. <br />According to the Bureau of Mines, blast vibrations have been found to <br />attenuate in accordance with the following equation: <br />~ ~° ~~ <br />`~ V = H CD//~B <br />.. <br />_~ <br />Where;,,' ~r <br />~' \`~ ~ V = Particle Velocity in In/sec <br />~ H = A site constant <br />D = Distance to point of interest <br />t B = Slte constant <br />`~ ~~ W = Pounds of explosive per delay <br />Schnabel Engineering <br />