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• blast site has been inspected for any potential hazards. <br />All drilling, loading, and blasting of drill holes will be performed in accordance with the Colorado <br />State Coal Mining Laws (Article 10, Section 2 and Article 11, Sections 1-12), Mine Safety and <br />Health Act (30 CFR 77.1300-77.1304), Federal Bureau of Alcohol, Tobacco and Firearms <br />(ATF), Internal Revenue Service (Title 26, Part 181, Commerce in Explosives), and Western <br />Fuels-Colorado safety rules and regulations. <br />Blasting Limitations <br />Air-blast. Electric blasting caps, noiseless NONEL or equivalent detonating equipment, and <br />various delay systems will be utilized to reduce airblast effects and noise. Airblast will not <br />exceed the limits in Table 2.05.3(6)(a)-1 at the location of any dwelling, public building, school, <br />church, or community or institutional building outside the permit area except at such structures <br />owned by WFC. <br />• Ground Vibration. WFC uses numerous seismograph monitors that are located off/on site at <br />nearby locations (homes, buildings, utilities, etc) to record the ground vibrations (in/sec) in the <br />three planes (Longitudinal, Transverse, Vertical). Where appropriate, these same <br />seismographs also record the air pressure change (dbL) caused by the blast at the same <br />locations. After each blast, the seismographs are downloaded and the information is printed <br />and analyzed. The information is then used to formulate a new blast scale distance factor as <br />well as to judge the shot as being in/out of compliance. For this permit, WFC will use the <br />Maximum Peak Particle Velocity (PPV) vs distance table located in Table 2.05.3(6)(a)-1 to <br />judge the ground vibrations for compliance purposes. The maximum allowable air blast limits <br />WFC will use for compliance judgement can also be viewed in Table 2.05.3(6)(a)-1. <br />Flv-Rock. Stemming is loaded into blast-holes prior to detonation to substantially reduce the <br />occurrence of fly rock. The depth of stemming will be designed such that the fly rock, which <br />may result from blasting operations, shall not be cast from the blasting site more than one-half <br />the distance to the nearest dwelling or other occupied structure, and in no case beyond the <br />area of control or beyond the line of property owned or leased by WFC. <br /> <br />(Revised July 2006) 2.05.3(6)(a)-9 <br />