Ga. Comp. R. & Regs. R. 120-3-10-.07 - Blasting Report

(1) A Blasting Report consisting of a pre-blast report, drilling log and a post-blast record will be required on all blasting events. Individual company forms may be acceptable when approved by the State Fire Marshal's Office and must provide the information required by O.C.G.A. Section 25-8-8.

(2) The licensed blaster must note on the pre-blast report the proximity to the closest structure or roadway and the distance to the nearest seismograph, when required,

(3) The pre-blast report must contain documentation of the following information:

(a) Company, Company License Number, Date, and Location;

(b) Describe Nearest Structure including Distance and Direction from Shot;

(c) Type of Shot with Minimum Planned Scaled Distance or Regression Data;

(d) Max and Min Borehole depth, Borehole diameter, and Max Charge Weight at Closest Distance;

(e) Products, Type of Rock, Pattern with Burden and Spacing, and Powder Factor;

(f) Stemming feet, Stemming Type, and Stemming Length Ratio Relative to Burden;

(g) Cover/Existing Overburden with Amount and Type, and Direction to Open Face;

(h) Date of Bulk Explosive Truck Calibration (if used); and

(i) Conditions with high fly rock potential, including but not limited to over confined shots, lift shots, outfall/wet conditions, spacing and burden exceeding the depth of any borehole in shot, and/or hole deviation. Document measures taken to compensate for high fly rock potential.

(4) A drill log shall be maintained on all blasting events to allow the blaster to take the appropriate action if an anomaly occurs. The licensed blaster must have this drill log available before the loading process begins.

(5) Stemming material shall consist of properly sized crushed stone. When adequate stemming length is not possible, matting of either earthen cover or a man-made material like synthetic rubber to insure proper confinement is required.

(6) A seismograph shall be used at the nearest structure during blasting events that are within 750 feet of the nearest house, public building, school, church, commercial or institutional building and roadway. The velocity/shock wave shall not exceed the established limits of U.S. Bureau of Mines RI 8507; appendix (b).

Exception: Where all pedestrian and vehicular traffic on a roadway can be restricted to a distance of 750 feet or greater from the blast site at the time of the firing of the blast or where a variance is issued by the State Fire Marshal's Office.

(7) Seismographs will be calibrated by manufacturer certified technician at least of one time per year.

(8) Bulk metering equipment will be calibrated by a qualified individual on a quarterly basis.

(9) A signed copy of a blast report for all blasts shall be retained by the blasting firm for a period of three (3) years. Upon request, a copy of the report shall be sent to the State Fire Marshal's Office.

(10) When blasting activities are conducted within 750 feet of an occupied structure or roadway, charge length shall be held to a maximum of 20 feet per deck and hole size will be limited to a maximum of 4 inches. In addition, there shall be a minimum of 6 foot of earthen cover or a man-made synthetic matting material. All facilities with a valid mining permit issued by the Georgia EPD, Land Branch Division, will be exempt from these requirements.

Notes

Ga. Comp. R. & Regs. R. 120-3-10-.07

O.C.G.A. §§ 25-2-4, 25-2-17, 25-8-9.

Original Rule entitled "Standards for Separation Distance of Ammonium Nitrate and Blasting Agents from Explosives and Blasting Agents"adopted. F. Jan. 29, 1968; eff. Apr. 1, 1968, as specified by the Agency. Repealed: New Rule entitled "Severability"adopted. F. June 3, 1987; eff. June 25, 1987, as specified by the Agency. Repealed: New Rule of same title adopted. F. July 9, 1998; eff. July 29, 1998. Repealed: New Rule entitled "Standards for Storage of Ammonium Nitrate"adopted. F. Apr. 17, 2002; eff. May 7, 2002. Amended: ER. 120-3-10-0.4-.07 adopted. F. and eff. Feb. 17, 2006. Amended: ER. 120-3-10-0.5-.07 adopted. F. and eff. June 8, 2006. Amended: Permanent Rule entitled "Blasting Report"adopted. F. Nov. 1, 2006; eff. Nov. 21, 2006. Amended: F. Dec. 13, 2019; eff. Jan. 1, 2020, as specified by the Agency.