2010 Construction and Material Specifications - Ohio Department of ...

208.08
or 120 feet (36 m) for a production hole line, until a technique produces the desired
results.
The blasting consultant shall witness the test sections drilling and loading
operations and be present when all test sections are shot. The time spent
witnessing these operations is considered part of the time required to observe the
loading, drilling, and blasting operations, as specified in 208.13.
208.08 Safety Procedures.
A. Warnings and Signals. Establish a method of warning all employees on the
job site of an impending blast.
Define the limits of the blasting area where there is a flyrock danger. Control
the access to the blasting area to prevent the presents of livestock or unauthorized
persons at least ten minutes before each blast.
Notify all employees in the area that a blast shall be fired with a 1-minute
signal. After the blast is over, sound an “all clear” signal so all employees in the
area understand that all blasting operations are finished.
One minute before the blast, sound three long signals, lasting 5 seconds, on
an air horn or siren. For the all “clear” signal, sound one long signal, lasting at
least 5 seconds, to indicate that all blasting has ceased.
Fill out the Department’s Blast Site Security Plan Form (CA-EW-11).
B. Lightning Protection. Furnish, maintain, and operate lightning detection
equipment during the entire period of blasting operations and during the periods
that explosives are used at the site. Use equipment similar or equal to the Thomas
Instruments SD250 Storm Alert as manufactured by DL Thomas Equipment,
Keene, New Hampshire. Install the equipment when approved. If the lightning
detection device indicates a blasting hazard potential, evacuate personnel from all
areas where explosives are present. If a lightning detector indicates a blasting
hazard, perform the following:
1. Clear the blasting area of all personnel.
2. Notify the Engineer of the potential hazards and precautions to be
taken.
3. Terminate the loading of holes and return the unused explosives to the
day storage area.
4. If blast holes are loaded and would pose a hazard to traffic if detonated,
close the roads until the lightning hazard has passed.
5. When the hazard dissipates, inform the Engineer that production
blasting can continue.
C. Check for Misfires. Observe the entire blast area for a minimum of 5
minutes following a blast to guard against rock fall before commencing work in
the cut. The 5-minute delay between blasting and not allowing anyone but the
blaster to enter the area is needed to make sure that no misfires have occurred.
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