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state Rea. <br />State Rea. <br />9. Peabody Opal Oong~any will use the explosive formula W = <br />(D/60)2, where W = max;trnim weic~t of explosives, D = <br />distance in feet to the nearest dwelling, church, school, <br />oon¢nPSCial, or industrial building, to ensure that the <br />TM~xi~ ~ peak particle velocity will not exceed one inch (1"} <br />pet secorrl at any dwelling, school, church, or oc~nercial or <br />institutional building. mutation of the explosive <br />formula will be rewrrled on the blasting record (Attachment <br />12-2) for each blast at the mine. <br />4.08.5 RE]ODRDS OF BSASPING FOR SURFACE COAL NIINING OPERATIONS. <br />Peabody Ooal C~npany will retain blast records, including <br />see aT reports if recd ~ i red, for at least three (3) years. <br />These records will be made available for inspection by the <br />Division and the public upon request. The record will contain <br />the data required by 4.08.5. A revised copy of Peabody Coal <br />Om~any's blasting record form is attached (Attaclmient 12-2). <br />4.08.6 SEISMOGRAPH MFA.SUREI4F31I'S <br />Peabody will use the explosive formula W = (D/60)2 to control <br />off-site ground motion. <br /> <br />12-46 Revised 10/17/94 <br />