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~._~ w <br />~,~ ~ 1 <br />;~ <br />ja l RECOMMENDATIONS <br />~4 <br />-' While Winslow Construction Company is not in violation of state <br />_i <br />l,~:: ,_~.,r"~si'' or local ordinances or common practice for excessive ground motion, <br />`.. ~-~Fry~~it may be worthwhile to modify shooting techniques to minimize <br />~~ "°~'`"~ground motion and resultant complaints from neighbors. Delay <br />~'. ir.~ ~ <br />.~.:.r'+"~~ blasting techniques can lower the ground motion induced by quarry <br />~K. ~.. 1 <br />J',~'~ .+',*~shooting by dividing the total explosives into smaller charges <br />yY.r ~• M <br />~?••~ <br />~~~~~' <br />;.w <br />~~~ : ,~ <br />:. <br />~~., gr. I <br />~~ <br />~,• <br />I <br />~ , 1. <br />• ~1'~I `~,~~( <br />IA. f [t I <br />Y YI `' .. ,jS y <br />-~ ,~,~ <br />~~` Y <br />•, i :' <br />~~ <br />. 1 <br />detonated at 25 millisecond intervals. Delay blasting is standard <br />practice in most large quarry and open pit mine operations. Delay <br />+•L~blasting can incorporate either electric or non-electric initia- <br />tion. In the former case, blasting caps with built-in delays <br />in multiples of 25 milliseconds are used. For non-electric <br />!initiation, delay devices can be installed in the detonating <br />'cord trunkline to produce the desired delays between shot holes. <br />i. <br /> <br />z~::=. <br />MICROC,~Ot'HYSICS <br />