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• <br />~ iii iiiiiiiiniiiiii <br />DEPARTMENT OF NATURAL RESOURCES <br />Davitl H. Getches, Executive Director <br />MINED LAND RECLAMATION DIVISION <br />DAVID C. SHELTON, Director <br />Richard D. Lamm <br />Governor <br />DATE: January 28, 1986 <br />T0: Brad James <br />FROM: Karen Hellner <br />RE: WHITEWATER SANDSTONE QUARRY -FILE N0. M-86-002 - BLASTING PLANS <br />At the request of Jim McArdle, I reviewed the blasting plans submitted by Rudy <br />Fontanari for 110 permit application M-86-002. According to the blasting plan <br />outlined in their permit application, a peak particle velocity of .34 in/sec <br />and a peak overpressure of .02 psi(116dB) would be generated. <br />According to the U. S. Bureau of Mines publications No.'s 8485 and 8507, <br />published in 1981, the minimum safe level for peak particle velocity is .50 <br />in/sec and that damage to a structure is not probable at less than 134 dB. <br />The blasting plan outlined by Rudy Fontanari meets the criteria stated above, <br />There are no structures within 800 feet of the proposed blast and the damage <br />potential at this distance is even less than stated above. I feel the <br />proposed blasting plan meets the minimum safe levels for blasting as outlined <br />by the U.S. Bureau of Mines. I only reviewed the blasting plans, not the <br />reasons the operator has for wanting to blast the quarry face. <br />/tmb <br />6920E <br />423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (303) 866-3567 <br />