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Section 3307 Blasting Operations
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Blasting operations shall be conducted in accordance with this chapter, including this section, and NFPA 495.
A permit issued pursuant to FC105.6 for the use of explosives for blasting operations, including excavation and demolition work, shall be issued for a period of up to 9 months. Such permit may be renewed for additional periods of up to 9 months, provided that the owner and blasting contractor have complied with the requirements of this chapter.
Blasting operations shall be performed in accordance with the instructions of the manufacturer of the explosives being used. Prior to conducting a blasting operation using explosives with which the blasting crew is unfamiliar, the blasting contractor shall ensure that the manufacturer of such explosives conducts an on-site training session for such crew. A record of attendance shall be kept of such training session and upon completion, the manufacturer and the blasting contractor shall certify that the blasting crew is qualified to use the explosives.
The following safety precautions and procedures shall be observed at a blast site:
- Only explosives approved by the commissioner may be used for blasting operations. Ammonium nitrate shall not be used as a blasting agent, except when approved for a specific blasting operation.
- The quantity of explosives used in a blast shall be no more than necessary to accomplish the task and shall be approved by the department.
- Blasting and job site personnel shall not fight fires in close proximity to explosives. All persons shall be removed to a safe area, the area affected by the fire shall be secured from entry, and the department shall be notified immediately.
- Primers shall be made only at the blast site, as needed. They shall be kept separate from all other explosives at all times until placed into the boreholes.
- Loading operations shall not take place on a cut or heading within 25 feet (7620 mm) of drilling or mucking operations.
- When tunnel blasting is to be performed:
- Advance or probe drilling shall be used to determine the nature of face ahead. Face shall be removed by the blaster using the smallest quantity of explosive necessary to achieve the desired blast.
- Only the blasters, assistant blasters and loaders may transport explosives from the magazine to the blast site.
- When blasting under compressed air is to be performed, detonators and high explosives shall be taken separately through the air lock with no other equipment to the pressure working chamber and immediately loaded. Unused explosives shall be returned to magazines before engaging the blasting circuit.
- Before firing an underground blast, the blaster shall have guards posted to all entrances to the danger zone, including any drift, raise, or other opening that may be expected to hole through.
- Only high explosives of Fume Class 1 shall be used in shaft, tunnel or under decking blasting operations.
- When demolition blasting is to be performed, the building to be demolished, as well as adjacent buildings within the blast area, shall be searched just prior to the blast to ensure that they are unoccupied.
- When submarine (underwater) blasting is to be performed:
- The drill boat shall be moored outside of navigation channels at night, equipped with a hose reel line capable of reaching any point on the deck for protection against fires, and durable "NO SMOKING" signs in compliance with the requirements of FC310 shall be conspicuously posted at approved locations on the boat. A red flag shall be flown during the day and approved United States Coast Guard warning lights shall be lit at night to indicate explosives storage aboard the drill boat.
- Warning buoys shall be positioned to indicate areas blasting operations are being conducted.
- Blasting operations shall cease while any marine traffic or divers are within a 1,500 ft. (457 200 mm) radius of the drill boat.
- Prior to the commencement of excavation blasting at a job site, and at such other time as the department may require, the blaster shall review with a department representative the blasting patterns to be utilized in connection with such blasting operations.
When blasting is conducted in a congested area or in close proximity to buildings, structures or infrastructure that may be damaged, or whose use and occupancy may be seriously affected by blasting operations, the blaster shall schedule the timing of each blast and take appropriate precautions in its loading, confinement and initiation, so as to minimize the effect of the blast upon surrounding uses and occupancies, and to control the ground vibrations and airblast effects. Shoring or other means approved by the commissioner of buildings shall be used to reinforce buildings, retaining walls and other structures and infrastructure that are susceptible to damage from vibration and airblast effects, and weak rock shall be manually removed by gads, picks or crowbars, without the use of explosives. When blasting is unavoidable in the vicinity of such buildings, structures and infrastructure, only light face blasts with short lines of resistance and small charges shall be used.
During an electrical storm, the handling and use of explosives, including loading, shall cease and the following procedures shall be observed:
The blasting contractor shall immediately suspend blasting operations and immediately notify the department should any condition arise from blasting operations that involves the structural integrity of a building, structure or infrastructure or that otherwise threatens the safety of the general public. The blasting contractor shall also immediately notify the Department of Buildings of any condition that involves the structural integrity of a building, structure or infrastructure. Blasting operations shall not resume until authorized by the department. The blasting contractor shall notify the department within 24 hours of all other complaints, including complaints of noise and minor damage.
Blasting operations shall be conducted between the hours of 7:00 am (0700 hours) and 7:00 pm (1900 hours), Monday through Saturday. The written authorization of the commissioner shall be required in order to conduct blasting operations at any other times, or on Sunday, and may be granted or revoked by the commissioner in the interest of public safety.
Prior to the issuance of any permit for the use of explosives for blasting operations, a permit survey meeting shall be arranged by the owner or the owner's blasting contractor and conducted at the job site at which blasting operations are to occur, for the purpose of reviewing the measures that the blasting contractor will be required to undertake to safeguard affected buildings, structures and infrastructure. Such permit survey meeting shall be attended by representatives of the department, general contractor and blasting contractor. The owner or the owner's blasting contractor shall invite the participation of owners of affected buildings, structures and infrastructure as determined by the department to be appropriate, and shall in addition notify the Department of Buildings of the meeting. The commissioner may also require notification of and coordination with other federal, state and city officials and agencies, including the Department of Environmental Protection, Office of Emergency Management, Metropolitan Transportation Authority, United States Coast Guard and United States Army Corps of Engineers, as appropriate.
Owners of electrical, natural gas, water and other utility infrastructure shall provide information to the department and the blasting contractor, including the location, depth, size, construction, condition and age of such infrastructure, including location of isolation valves, and any other information that the department may require to determine the measures that the blasting contractor will be required to undertake to safeguard such infrastructure during blasting operations. Such information shall be readily available for the duration of blasting operations.
For blasting operations near or adjacent to a natural gas utility infrastructure, the utility company may require access to the job site so that a leak survey may be conducted prior and subsequent to blasting operations. The blasting contractor shall provide the utility company with access to the job site for such purpose.
For demolition blasting, the blasting contractor shall coordinate with and provide access to the utility company to disconnect all power lines within 100 feet (30 480 mm) of the structure to be demolished, and sever physically from the main street lines, and cap as close to the main as possible, all services extending into the structure. Blasting shall not be conducted unless existing utility service street lines are cut and capped.
The blasting contractor shall conduct blasting operations in a manner that minimizes the impact of such blasting operation on public safety. Good faith measures shall be made to schedule blasting at those times when students in affected schools are not arriving, departing or outdoors, and when services are not being held at houses of worship, and to otherwise coordinate the timing of blasting operations to minimize the impact on affected uses and occupancies. Appropriate procedures for coordination and notification shall be established at the permit survey meeting.
Within 5 calendar days of issuance of a permit for the use of explosives for demolition or excavation work, the owner or the owner's blasting contractor shall provide written notice to each council member and community board whose respective district includes the job site or property within 100 feet (30 480 mm) thereof, and the local fire company. Such notice shall contain the effective and expiration dates of the permit. Proof of the delivery or mailing of such notice shall be filed with the department.
Not less than 2 calendar days nor more than 5 calendar days prior to the commencement of blasting operations, the owner or the owner's blasting contractor shall provide written notice of same to each council member and community board whose respective districts include the job site or property within 100 feet (30 480 mm) thereof, and the local fire company. Such notice shall contain the date or dates on which blasting operations are anticipated to take place and telephone numbers for the blasting contractor and the department to which complaints and inquiries about the blasting operations may be made. The owner or the owner's blasting contractor shall in addition forward a copy of the written notice to the owners of all buildings within 100 feet (30 480 mm) of the job site. Owners of such buildings shall post such notice at a conspicuous location within each such building in a manner prescribed by the department to ensure adequate visibility. If blasting operations continue for a period of more than 1 month, additional notice shall be given to owners of such buildings and posted by such owners on a monthly basis for any month in which blasting operations are to be conducted.
The blasting contractor shall provide advance notification of blasting operations to the fire company in whose administrative district the job site is located. Except where overnight storage of explosives is approved and except as may be approved for underground job sites, after the final blast has been fired for the day, the blasting contractor shall arrange with such fire company for an inspection of the job site to confirm removal of explosives as required by this chapter.
If a demolition project is in proximity to blasting operations, the blasting contractor shall advise the demolition contractor of the blasting contractor's warning signals.
Related Code Sections
3307.5.2 Safeguards During Construction or Demolition, Flagperson
, or when dangerous operations, such as blasting, may affect such areas ...
NYC Building Code 2008 > 33 Safeguards During Construction or Demolition > 3307 Protection of Pedestrians > 3307.5 Watchperson and Flagperson > 3307.5.2 Flagperson
3307.4.4 Safeguards During Construction or Demolition, Areas Open to Persons Other Than Workers
, or when dangerous operations, such as blasting, may affect such areas. Where required by the Department of Transportation, designated personnel shall ...
NYC Building Code 2014 > 33 Safeguards During Construction or Demolition > 3307 Protection of Pedestrians > 3307.4 Warning Signs, Personnel, and Barriers > 3307.4.4 Areas Open to Persons Other Than Workers
503.12.1 Chimneys and Vents, Appliances Requiring Draft Hoods
appliances, appliances requiring chimney draft for operation, appliances equipped with blast, power, or pressure burners that are not listed for use ...
NYC Fuel Gas Code 2014 > 5 Chimneys and Vents > 503 Venting of Appliances > 503.12 Draft Hoods and Draft Controls > 503.12.1 Appliances Requiring Draft Hoods
503.12.1 Chimneys and Vents, Equipment Requiring Draft Hoods
appliances, equipment requiring chimney draft for operation, equipment equipped with blast, power, or pressure burners that are not listed for use ...
NYC Fuel Gas Code 2008 > 5 Chimneys and Vents > 503 Venting of Equipment > 503.12 Draft Hoods and Draft Controls > 503.12.1 Equipment Requiring Draft Hoods
Appendix A Selected Rules of the Department of Buildings [PDF] (page 82)
on or across areas open to the public or when dangerous operations, such as blasting, may affect such areas. 8. Scaffolds, structural ramps, runways ...