The operator shall retain a record of each blast, including seismograph reports, which shall be retained for at least three years and which shall be available for inspection by the Commission and the public on request. The record shall contain the following data: (1) name of the operator conducting the blast; (2) location, date, and time of blast; (3) name, signature, and certification number of blaster conducting the blast; (4) identification, direction, and distance, in feet, from to the nearest blast hole to the nearest dwelling, public building, school, church, community or institutional building located outside the permit area, except those described in §12.360(i) of this title (relating to Use of Explosives: Control of Adverse Effects); (5) weather conditions, including those which may cause possible adverse blasting effects such as temperature, and wind direction and
approximate velocity; (6) type of material blasted; (7) sketches of the blast pattern, including number of holes, burden, spacing, decks, and delay pattern; (8) diameter and depth of holes; (9) types of explosives used; (10) total weight of explosives used per hole; (11) maximum weight of explosives detonated within any 8-millisecond period; (12) maximum number of holes detonated within any 8-millisecond period; (13) initiation system; (14) type and length of stemming; (15) mats or other protections used; (16) type of delay detonator and delay periods used; (17) sketch of the delay pattern; (18) number of persons in the blasting crew; (19) seismographic and airblast records, where required, which shall
include: (A) type of instrument, sensitivity, seismographic reading, and calibration signal or certification of annual calibration; (B) exact location of the instrument and the date, time, and distance from the blast; (C) name of the person and firm taking the seismograph reading; (D) name of the person and firm analyzing the seismographic record; and (E) the vibration and airblast level recorded; and (20) reasons and conditions for each unscheduled blast.
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