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Fourth Adequacy Letter, Amended CN-01 12 <br />May Day Idaho Mine Complex <br />distance, in feet, from the blast to the nearest dwelling, school, church, or community or <br />institutional building located outside the permit area; and Ds = the scaled-distance <br />factor, using the values listed in the following table. <br />Distance (D) from the Blasting Site (in feet) Scaled-Distance Factor to be Applied (DS) <br />0 to 300 50 <br />301 to 5000 55 <br />5001 and beyond 65 <br />The permit application includes a commitment to conduct vibration monitoring for <br />blasts that detonate more than 220 pounds of explosive per delay period. The blasting <br />review prepared by Terry Morris, PE, that is included in the application recommends <br />that monitoring be conducted for blasts that detonate more than 200 pounds of <br />explosive per delay period. The Applicant must commit to the 200 pound limit as the <br />trigger point for a monitoring requirement. <br />The Applicant must commit to preparation and maintenance of a written record for <br />each blast. A record of each blast, including seismograph reports, shall be retained for <br />at least 3 years and shall be available for inspection by the Division upon demand. The <br />record shall contain the following data: <br />a. Name of the operator conducting the blast; <br />b. Location, date, and time of blast; <br />c. Name, signature, and license number of blaster-in-charge; <br />d. Identification, direction and distance, in feet, from the nearest blast hole to the <br />nearest dwelling, school, church, or community or institutional building not located <br />in the permit area; <br />e. For surface blasts, weather conditions, including temperature, wind direction, and <br />approximate velocity; <br />f. Type of material blasted; <br />g. Sketches of the blast pattern including number of holes, burden, spacing, and delay <br />pattern; <br />h. Sketches shall also show decking, if holes are decked to achieve different delay times <br />within a hole; <br />i. Diameter and depth of holes; <br />j. Types of explosives used; <br />k. Total weight of explosives used per hole and maximum weight of explosives used <br />per 8-millisecond period; <br />1. Initiation system; <br />m. Type and length of stemming; <br />n. Mats or other protections used; <br />o. Type of delay detonator and delay periods used; <br />p. Number of persons in the blasting crew; and <br />q. Seismographic and airblast records, where required, including: <br />(1) Type of instrument, sensitivity, and the calibration signal of the gain setting or <br />certification of annual calibration;