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• • <br /> Review of Blasting Operations at Robinson Brick Company's Siloam Clad tvtine <br /> 5 N <br /> 4 10 <br /> n <br /> 3 O� <br /> c 1116 <br /> i <br /> u 2 Odi �� x <br /> N G r S <br /> N <br /> C GO % .L <br /> w O„ ` C <br /> e 1.0 O^ % p 7A <br /> 0.9 <br /> T0.8 V55 `�0�� K= 605 <br /> v 0.7 O� N <br /> 0.6 <br /> 0.5 �co <br /> :, 0.4 <br /> t <br /> m K=242 <br /> a <br /> x 0.3 <br /> to <br /> d <br /> IL <br /> 0.2 <br /> K=24 <br /> 0.1 <br /> 10 15 20 25 30 40 50 60 70 80 90100 <br /> Scaled Distance — ft./lb.'/2 <br /> Figure 2.3--Oriard Blast Vibration Prediction Curves <br /> The Colorado Division of Labor blasting regulations require blasters to use a minimum scaled- <br /> distance (SD) of 55 ft/lb12 when calculating maximum charge weights. Charges determined with <br /> this formula are designed to ensure that ground motion does not approach levels that might cause <br /> GEOTEK&Associates, Inc. Page 8 January 99 <br />