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Section 780.13 (f) Continued. Revised 11/20/80 sonnel. Signs identifying areas as blasting areas will describe the warning and all clear signals. A modulated siren shall be sounded approximately 3 minutes before the blast, a single tone from the siren will signal all clear, and each specific blasting area will be identified as such and all charged holes will be guarded against unauthorized personnel. Access to the immediate blasting site area will be cleared and controlled by qualified mine personnel prior to a blast. While mining and blasting are being conducted in Pit Ill and Pit I12 within 1/2 mile of Jackson County Road 12E traffic control will be necessary. Qualified mine person- nel will, prior to each such blast, clear traffic from Jackson County Road 12E and stop all traffic at least 1/2 mile from the point of the blast. This procedure will assure that no one en- croaches into the blasting area until the all clear signal des- cribed above has been sounded. Kerr Coal will use the explosive equation of paragraph (1)(1), 30 CFR 816.65 to limit the number of blast holes per delay to assure that peak particle velocity does not exceed two inches per second. If deviation from the number of holes per delay should occur, or upon request of the regulatory authority, a seismograph will be utilized to assure compliance with the peak particle velocity limit. A record of all coal and overburden blasts in the format shown in Figure 31, Blasting Record, will be employed by Kerr Coal. Because Kerr Coal has chosen to use the explosive equation in paragraph (1) (1) of Section 816.65, seismographic records will not be used. I . Kerr Coal will conduct blasting only during times announced in the blasting schedule, except where safety requires the mitigation of unavoidable hazardous situations. The regulatory authority must give prior approval for any blasting to mitigate unavoidable hazar- dous situations. 780-28 as