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Review of BInsting Opee??tioos of summit Briiich <br />ANALYSES of BLASTING IMPACTS,, 2.2 cent' <br />Using this formula at the Fox Mine, the overpressure at the nearest structure (the <br />Yianratty house) at a distance (D) of 500 feet with an 80-pound 'charge per delay (W), <br />would be around 0.009339 psi. In decibel scale, this air overpressure is 110 dB. The <br />intensity of this overpressure is many times less than the 0.0 129psi overpressure at the <br />133-dB limit allowed by the Colorado regulations. On quiet days, people may hear blasts <br />with overpressure at this level. However, damage to structures is impossible at this level. <br />3.0 GENERAL BLASTING CONCERNS OF PROJECT NEIGHBORS: <br />Some neighbors of the various Summit Brick Mines have expressed a desire for more <br />information regarding the monitoring of explosive transportation and use activities. The <br />purpose of this section is to provide general information about modem blasting methods, <br />transportation systems and regulations applying to their use. <br />All blasting work proposed for the various mines of Summit Bride Co. will be performed <br />by either L.W. Weir Transfer, Inc., or Lonnie Loader Construction, both of whom are <br />very experienced contract blasting companies. It the usual practice to utilize a contract <br />powder company to manage all explosive transportation and storage activities. Explosive <br />transport vehicles will satisfy all the stringent vehicle standards as required by Federal <br />Department of Transportation (DOTS After blasting, unused explosives are secured in <br />approved explosive magazines. Once explosives enter any Summit Brick Mine site, their <br />transportation and use is regulated by the Federal Mine Safety and Health Administration <br />(MSHA) and by the Colorado Department of Labor. Only a fully licensed and qualified <br />blaster examination will control all blasts. Additionally the blaster will meet the <br />experience requirements set forth by the Colorado Department of Labor. Ucensed <br />blasters and contractors are required to be knowledgeable about and to comply with all <br />regulations governing explosives and blasting. When a regulation from one agency is <br />more stringent than that of another, the more stringent of the two regulations will apply. <br />23