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INDUSTRY, LABOR AND HUMAN RELATIONS 44-1 <br /> R 7 <br /> (b) Shall not be cast from the blasting site more than one-half the dis- <br /> tance to the nearest inhabited building within or outside of the controlled <br /> blasting site area. <br /> (4) GROUND VIBRATION. (a) General. 1. The maximum ground vibra- <br /> tion at the location of any dwelling, public building, place of employ- <br /> ment,school,church,or community or institutional building outside the <br /> controlled blasting site area shall be established in accordance with ei- <br /> ther the maximum peak-particle-velocity limit of par. (b), the scaled- <br /> distance equation of par. (c), the blasting-level chart of par. (d), or by <br /> the department under sub. (5). <br /> 2.All stuctures in the vicinity of the blasting area,not listed in subd.1, <br /> such as water towers, pipelines and other utilities, tunnels, dams, im- <br /> poundments and underground mines shall be protected from damage by <br /> establishment by the operator of a maximum allowable limit on the <br /> ground vibration. The operator shall establish the limit after consulting <br /> with the owner of the structure. <br /> (b) Maximum peak particle velocity. 1. An operator may use the maxi- <br /> mum ground vibration limits listed in Table 7.64-2. <br /> Table 7.64-2 <br /> PEAK PARTICLE VELOCITY LIMITS <br /> Maximum allowable peak <br /> particle velocity for ground <br /> Type of structure vibration, in/sec <br /> At frequencies of <br /> At frequencies 40 Hz and <br /> below 40 Hz1 greater <br /> Modern homes and <br /> structures with drywall <br /> interiors 0.75 2.0 <br /> Older homes and structures <br /> with plaster on wood lath <br /> construction for interior <br /> walls 0.50 2.0 <br /> All spectral peaks within 6 dB (50 pct)amplitude of the predominant frequency must be <br /> analyzed. <br /> 2. Ground vibration shall be measured as the particle velocity.Particle <br /> velocity shall be recorded in 3 mutually perpendicular directions. The <br /> maximum allowable peak particle velocity shall apply to each of the 3 <br /> measurements and the vector sum of the 3 measurements. <br /> 3. A seismographic record shall be provided for each blast. <br /> (c) Scaled-distance equation. 1. An operator may use the scaled-dis- <br /> tance equation, W = (D/Ds)2,to determine the allowable charge-weight <br /> of explosives to be detonated in any 8-millisecond period, without seis- <br /> mic monitoring; where W = the maximum weight per delay of explo- <br /> sives, in pounds; D = the distance, in feet, from the blasting site to the <br /> nearest structure listed in par. (a) 1;and Ds = the scaled-distance factor <br /> listed in Table 7.64-3. <br /> Register,May, 1987,No.377 <br /> s <br />