AI-assisted research summary: Blast records must be kept, retained for at least 3 years, made available for inspection, and must not contain false entries.
A record of each blast shall be kept. All records, including seismograph reports, shall be retained at least three (3) years and shall be available for inspection and shall contain the following minimum data: Name of company or contractor; Location, date and time of blast; Name and signature of blaster on charge; Type of material blasted; Number of holes, burden and spacing; Diameter and depth of holes; Types of explosives used (trade name); Total weight of explosives used; Maximum weight of explosives and maximum number of holes per delay period; Method of firing with overhead diagram of the delay pattern; Direction and distance in feet to nearest dwelling house, public building, school, church, commercial or institutional building normally occupied, neither owned nor leased by the person conducting the blasting; Weather conditions; Type and height or length of stemming; Type of delay blasting caps used and delay periods used (trade name); Kind of mats or other forms of protection used; The person taking the seismograph reading shall accurately indicate the location of each seismograph used, and its distance from the blast; Name of person and/or firm analyzing the seismograph record; Name of driller; Type of material blasted and any anomalous or unusual conditions encountered during drilling; Location of holes not loaded or those requiring non-typical loading; and Documentation of measures taken to compensate for anomalous or unusual conditions. It is unlawful for any person to make any false entry in any record required to be kept pursuant to this section.