Oklahoma Administrative Code
Title 460 - Department of Mines
Chapter 25 - Oklahoma Explosives and Blasting Rules and Regulations
Subchapter 13 - Performance Standards
Section 460:25-13-20 - Seismographic measurements

(a) If a blaster decides that the table of maximum pound per delay established in 460:25-17-19, is too conservative, he may use seismographic measurements and increase the charge per delay period, provided the velocity as required by Section 460: 25-13-19(a) is not violated. He must use the seismographic on every shot thereafter so long as the table is not being complied with.

(b) If a blaster considers the table too conservative for his particular area, he may, upon submission of seismographic reports, petition for a modified table for blasting operation at the particular site, but in no case shall the Department allow a table that would allow velocities above the requirements of Section 460: 25-13-19(a).

(c) In making a seismographic determination of the velocity at a particular position, the following formula shall be used: V = VO(Do/D)1.5; Where VO is the maximum ground particle velocity at the seismograph, Do is the distance of the seismograph from the blast, and D is the distance from the blast to the position in question and in the same general direction. The distance Do may not be greater than D, and D cannot be more than five (5) times Do. This determined velocity at the site of any dwelling house, public building, school, church, commercial or institutional building shall not exceed the requirements of Section 460: 25-13-19(a).

(d) If special conditions occur which indicate that abnormal or potentially damaging ground vibrations may result from blasting, the Department may require a seismograph recording of any or all blasts.