(a)In all blasting operations, except as otherwise provided in this chapter, the maximum peak particle velocity of any component of ground motion recorded on a three-component seismograph (where the components - transverse, vertical, and longitudinal - are arranged mutually perpendicular) shall not exceed two inches per second at the location of any dwelling house, public building, school, church, or commercial or institutional building normally occupied.
(b)For blast-to-structure distance greater than 300 feet, the standard table for maximum charge per delay shall be generated by the formula: Click here to view image where W is the weight of explosive in pounds and D is the distance in feet to the nearest dwelling house, public building, school, church, or commercial or institutional bu
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(a) In all blasting operations, except as otherwise provided in this chapter, the maximum peak particle velocity of any component of ground motion recorded on a three-component seismograph (where the components - transverse, vertical, and longitudinal - are arranged mutually perpendicular) shall not exceed two inches per second at the location of any dwelling house, public building, school, church, or commercial or institutional building normally occupied. (b) For blast-to-structure distance greater than 300 feet, the standard table for maximum charge per delay shall be generated by the formula: Click here to view image where W is the weight of explosive in pounds and D is the distance in feet to the nearest dwelling house, public building, school, church, or commercial or institutional building normally occupied. (c) The following table may be used for determining the weight of explosives to be used with a single delay period: STANDARD TABLE OF DISTANCE Distance in Feet Weight in Pounds Distance in Feet Weight in Pounds 0-10 1/8 350 49 11-15 1/4 400 64 16-20 1/2 500 100 21-25 3/4 600 144 26-30 1.00 700 196 40 2.25 800 256 50 3.50 900 324 60 4.75 1000 400 70 6.00 1100 484 80 7.25 1200 576 90 8.50 1300 676 100 9.75 1400 784 110 11.0 1500 900 130 13.5 1600 1024 150 16.0 1700 1156 170 18.5 1800 1296 190 21.0 1900 1444 210 23.5 2000 1600 230 26.0 2500 2500 250 28.5 3000 3600 270 31.0 3500 4900 290 33.5 4000 6400 300 34.75 4500 8100 (d) For nontabulated distances of over 300 feet, the following formula shall be used: Click here to view image