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[valuation ol'Proposed Blasting at [he ACA Riprap Quany near Buena Vista, L <br />3.0 RECOD4A4ENDED BLASTING CONTROLS <br />If the maximtutt PPV is limited to 3.0 inches in the ground near the Dani, the author is confident <br />that no damage will occur. To ensure this result, maximum charge weights should be determined <br />by meeting a mirrirnum scaled distaztce of 15.5 ft-Ih-O''. This scaled-distance-limit was calculated <br />by rearranging equation 2.2 and solving for scaled distance (i)~1 with PPV cet to ± it1's (L7, _ <br />(3!240)~~~r b]. 1b'ith a known scaled distance, maximum charge weight is calculated using the <br />following simple formula. <br />/D~ <br />I'or example. if distanec (D) is 200 feet, for a minimum scaled distance (D.~) of 15.5 ft-lb-°', the <br />maximum charge weight per delay (within any S-millisecond time period) would be 166.5 <br />pounds [(200/15.5)Z]. Compliance with the recommended 3.0-in/s PPV limit should be <br />determined by measuring groutta rt,otions by placing a seisntograplt at the closest rock outcrop at <br />the base of the Trout Crecl: Dam. <br />It addition to limiting charge weight by meeting a minimum scaled distance of 15.5. it might also <br />be practical to limit the diamctcr of blastholes to 4 inches. If these limitations are applied to all <br />blasting in the ACA Phase 11 permit area, RAI is contiderrt that blasting will cause no harm to the <br />'frnur C'r~ek T')am. <br />REVEY:lssnciates, Inc. Page ; July 1UU~ <br />