N.J. Admin. Code § 12:190-7.10

Current through Register Vol. 57, No. 1, January 6, 2025

Section 12:190-7.10 - Drilling blast holes

(a) Prior to drilling blast holes, a written diagram and a field layout of all blast holes shall be prepared by the blaster and given to the driller.

(b) The surface shall be carefully examined to detect the possible presence of unfired explosive materials, and drilling shall not be performed in blast holes that have contained explosive materials.

(c) When a blast hole has been loaded, no drilling shall be performed within a distance less than the depth of the hole, but in no case less than 25 feet from the loaded blast hole. Drilling may be performed to free an obstructed blast hole not containing explosives, when all explosives in the vicinity have been located at a safe distance. Such drilling operations shall be under the direct supervision of the blaster.

(d) All blast holes shall be of sufficient diameter so that cartridges of explosive materials can be inserted to the bottom of the hole without excessive force.

(e) Any person drilling blast holes shall inform the blaster of any unusual conditions, such as voids or mud seams or any deviation from the blast hole layout involving burden and spacing. Unusual conditions shall be recorded in writing and sent to the blaster.

N.J. Admin. Code § 12:190-7.10

Administrative correction.
See: 29 New Jersey Register 566(a).
Amended by R.1998 d.110, effective 3/2/1998.
See: 29 New Jersey Register 4624(a), 30 New Jersey Register 847(a).
In (a), inserted "Prior to drilling blast holes" and rewrote (e).