SECTION 460:25-13-19. Blasting standards

(a)   In all blasting operations, except as hereinafter otherwise provided, the maximum safe peak particle velocity shall not exceed at the immediate location of any dwelling house, public building, school, church, commercial or institutional building, the following:

(1)   Distance of structure from a blast 0-300 feet 2.0″/sec PPV (see Appendix A for allowable pounds per delay).

(2)   Distances of structure from blast 301 feet and beyond 1.0″/sec PPV initially until the blaster can determine from a history of blasts that a preponderance of frequencies, 40 HZ or above, are high enough to justify the 2.0″/sec PPV limit.

(b)   This ground velocity limit is not construed to mean property owned, leased, or contracted by the blaster or blaster's company or property on which the owner gives a written waiver.

(c)   No two (2) consecutive subcharges within any charge shall be separated by a delay time of less than eight (8) milliseconds.

(d)   A table to be used for determining weight of explosives to be used on a single delay is in Appendix A of this Chapter.

(e)   The standard table for the maximum charge per delay shall be generated by the formula: W = (D/scaled distance)2; Where W is the weight of explosive in pounds and D is the distance from the charge to the nearest dwelling house, public building, school, church, commercial or institutional building in feet. The scaled distance factors allowed for various distances from the blast site, the table in Subsection (h) will be used. On sites where the Department decides it necessary to comply with the provision of the law this formula may be altered.

(f)   For the purpose of well shooting below 100 feet, the table shall be generated by the formula: W = (D/50)3; Where W is the total weight of explosives in the hole and D is the distance from the charge to the nearest dwelling house, public building, school, church, commercial, or institutional building.

(g)   The duration of the blast shall not exceed 1,000 milliseconds (1 second). If special conditions occur requiring a blast design which exceeds the 1,000 millisecond limit, the Department may alter the limit upon a review of the blasting plan.

(h)   Scaled Distance factors allowed for various distances from blast site:

(1)   0 to 300 ft. from blast site-Use scaled distance factor of 50 without seismic monitoring.

(2)   301 to 5,000 ft. from blast site - Use scaled distance factor of 55 without seismic monitoring.

(3)   5,001 ft and beyond from blast site - Use scaled distance factor of 65 without seismic monitoring.

(i)   For distances less than 300 feet use the table in Appendix A.

[Source: Added at 13 Ok Reg 1111, eff 1-11-96 (emergency); Added at 13 Ok Reg 3499, eff 8-26-96]