The following are intended to be minimum standards and requirements for all blasting operations.
Notwithstanding any other provision of this chapter or of any license issued under this chapter, no blasting operation shall be conducted in such a manner as to cause any substantial loss, harm or damage to the owner of any property located outside of the controlled blasting site area, or to the Village, or to the public health, safety or welfare, or to create a serious risk of such loss, harm or damage.
No person shall prepare explosive materials for use in any blasting operation or conduct or engage in any blasting operation, and no operator shall employ any person for such purposes, unless the person so preparing explosive materials or conducting or engaging in a blasting operation holds a valid blaster's license of the proper classification issued by the Department pursuant to Ch. COMM 7, Wis. Adm. Code, or unless such person is working under the direct supervisor of a blaster holding a valid blaster's license of the proper classification.
No person shall conduct or engage in any blasting operation, or any related activities, without complying fully with the requirements of this chapter and the requirements of Ch. COMM 7 ("Explosive Materials"), Wis. Adm. Code.
Blasting operations shall only be conducted between 9:00 a.m. and 4:00 p.m. on Mondays through Fridays and between 9:00 a.m. and noon on Saturdays other than on legal holidays, or during more restrictive periods specified in a particular blasting license; provided, however, that in the event an emergency has delayed a blast, a loaded charge may be exploded within a reasonable time thereafter. The Village Administrator may authorize in writing individual instances of blasting outside of the normally permissible time periods upon a showing of extreme nonrecurring need by an operator.
A blasting log shall be prepared and maintained by the operator for each blast, and a complete copy of such log shall be delivered to the Village Clerk within three working days after such blast. Each blasting log shall contain the following information, if applicable and without limitation:
Name and license number of blaster in charge of the blast;
Blast location with grid coordinates referenced to a scaled aerial photograph or scaled diagram of the blasting site;
Date and time of blast;
Weather conditions at time of blast;
Diagram and cross section of blast layout;
Number of blast holes, if applicable;
Blast hole depth and diameter;
Spacing and burden of blast holes;
Number of holes per delay or number of delays per hole;
Maximum pounds of explosives per delay;
Total pounds of explosives used;
Depth and type of stemming used;
Distance to nearest inhabited building outside of the controlled blasting site area;
Type of initiation system used;
Exact location of the monitoring instrument, including the distance from the blast and the grid coordinates of the instrument referenced to a scaled aerial photograph or scaled diagram of the blasting site and surroundings supplied to the Village;
Name and affiliation of the individual reading the monitoring instrument;
Type, manufacturer and model of the monitoring instrument used and the last calibration date;
Peak particle velocity and airblast levels recorded; and
Name of individual and firm analyzing the peak particle velocity and airblast data, when required.
All blast monitoring instruments utilized to monitor blasts pursuant to this chapter shall comply with the following minimum specifications:
Seismic frequency range: 2 to 200 Hz (±3 dB).
Acoustic frequency range; 2 to 200 Hz (+3 dB).
Velocity range 0.02 to 4.0 inches/second.
Sound range: 110 to 140 dB linear.
Transducers: three mutually perpendicular axes.
Recording: provide time-history of waveform.
Calibration: be laboratory calibrated as often as necessary, but at least once every 12 months and according to manufacturer's recommendations.
The operator shall monitor every blast with a blast monitoring instrument satisfying the requirements of this chapter located in the immediate vicinity of the closest inhabited building outside of the controlled blasting area or, if the operator cannot obtain permission to monitor at such location, at the location best approximating the location of such building for the purposes of accurately monitoring the level of the blasting resultants at such building. Village officials may direct the operator to monitor blasts at other locations from time to time, and the operator shall comply with such directions. If it appears that the blasting resultants are higher at an inhabited building outside of the controlled blasting site area other than the closest such inhabited building, the monitoring instrument shall be located in the immediate vicinity of such other building. The peak particle velocity and peak airblast decibel readings with respect to each blast shall be delivered to the Village Clerk within three business days after the blast.
Flyrock traveling through the air or along the ground shall remain within the controlled blasting site area and shall not be cast from the location of the blast more than one-half of the distance to the nearest inhabited building within or outside of the controlled blasting site area. Any violation of this requirement shall be reported immediately by the operator to the Village Clerk with a full explanation of the probable cause of such violation and the steps being taken to preclude any possibility of a repetition.
Ground vibration resulting from a blast shall not exceed the peak particle velocity limit set out in the following Figure 1 at the inhabited building located outside of the controlled blasting site area which is closest to the location of the blast or at any inhabited building located outside of the controlled blasting site area.
Airblast resulting from a blast shall not exceed 118 dB at the inhabited building located outside the controlled blasting site area which is closest to the location of the blast or at any other inhabited building located outside of the controlled blasting site area.