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Section 780.13 (f) Continued. • located within one-half mile of any part of the permit area. A written pre-blasting survey, which includes any proposed blasting program adjustments inlcorporated to prevent property damage, shall be promptly provided to the persons requesting the survey and to the regulatory authority. Kerr Coal will publish a blasting schedule similar to the one set forth in Figure 18, Proof of Publication of Blasting Schedule, in the Jackson County Star, published in Walden, Colorado, prior to beginning any blasting program. Before blasting in areas or at times not described in the published blasting schedule, a revised schedule will be promptly mailed to residents or owners of dwel- lings within one-half mile of the permit area; published schedules will also be mailed to residents or owners of these adjacent dwel- lings. U Kerr Coal will give individually distinguishable warning and all- clear signals, which are audible within a range of one-half mile from the point of the blast. A modulated siren shall be sounded approximately three minutes before all blasts as the warning signal, and a single tone from the siren shall signal all clear after each blast. Persons working within the permit area and persons who reside or regularly work within the one-half mile of the permit area shall be notified of and instructed regarding the meaning of the signals by periodic delivery of a certified letter informing such persons of the meaning of the signals. Kerr Coal shall also maintain signs in accordance with 30 CFR 816.11 (f ). Kerr Coal will regulate access to any area within the permit area which might be subject to flyrock from blasting for the protection of the public and livestock. The general mine areas are identified by signs on all access roads restricting entry to authorized per- I~ 780-27