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TABLE 142 <br />MODIFIF_D SCALED DISTANCE FACTORS <br />YOAST MINE <br /> Maximum Allowable Peak <br />Distance (D) from the Blasting Modified Scaled-Distance <br /> Particle Veloaty (V max) For <br />Site Factor <br /> Ground Vibration <br />eet <br />z <br />(Ds) <br /> (inches/second) t <br />0 to 300 1.25 31 <br />301 to 5.000 1.00 35 <br />5.001 and be and 0.75 42 <br />1) Ground Velocity shall be measured as the particle velocity. Peak particle velocities shall be recorded in tluee <br />mutually perpendicular directions from the blasting site. The maximum peak particle velocity shall be the <br />largest of any of the three measurements. <br />2. Applicable to the modified scaled-distance equation derived from data collected by MMC (11 /29/01). See <br />Attachment 143, Yoast Mine Ground Motion Attenuation Stud . <br /> <br />The blasting schedule will identify as accurately as possible the location of the blasting site and the • <br />time periods when blasting will occur. The blasting schedule will contain at a minimum: <br />a. Identification of the spedfic areas in which blasting will take place. The specific blasting azeas <br />described will not be lazgex than 300 acres; <br />b. Dates and time perods when explosives axe to be detonated; <br />c. Methods to be used to control access to the blasting area; <br />d. Types of audible warnings and all deaz signals to be used before and after blasting; <br />e. A description of possible unavoidable hazazdous situation when it may be necessary to blast <br />at times other than those described in the schedule. <br />All blasting will be conducted between sunrise and sunset at locations defined in the published <br />blasting schedule. Unscheduled blasts would be conducted only where public or operator health and <br />safety so require and for the emergency blasting situations described in the blasting schedule and <br />below. <br />Safety considerations may dictate emergenry detonations at times other than those defined in the <br />published blasting schedule. The following conditions, as defined in regulations (30 CFR 77) • <br />promulgated under the Federal Coal Mine Health and Safety Act of 1969 and 1977 Amendments, <br />MR-24 6 Revised 9/05 <br />