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

208.06
D. A typical loading diagram showing the type and amount of explosives,
primers, and initiators and location and depth of stemming.
E. Typical range of initiator sequence of blast holes including delay times and
delay system.
F. Manufacturers’ data sheets for all explosives, primers, and initiators to be
employed.
G. Use the blaster’s plan form or the blasting plan forms in FHWA Publication
FHWA-HI-92-001 Rock Blasting and Overbreak Control. Adapt these forms to
meet the project requirements.
In a subsequent submittal, submit one Detailed Plan for all test sections.
(Submit or fax at least 24 hours before the shot.) Detail the specific proposed
amounts of materials and work described in 208.05.A through 208.05.G above on
this Detailed Plan.
The Blasting Plan submittal is for quality control, informational, and record
keeping purposes. The review of the Blasting Plan does not relieve the Contractor
of the responsibility for using existing drilling and blasting technology and for
obtaining the required results.
If specified in the Contract, use an approved blasting consultant, conforming to
208.13, to assist with the blast design and to ensure that the Blasting Plan is carried
out on the project.
208.06 Production Holes. Perform all production blasting, including blasting
carried out in conjunction with the blasting test section requirements of 208.07,
according to the following requirements:
A. Drill the production blast holes on the patterns and to the depths submitted in
the Blasting Plan and Detailed Plan, as specified in 208.05, but not exceeding a
depth of 60 feet (18 m). Drill the production blast holes within two blast hole
diameters of the staked collar location. If the blaster does not drill the production
holes then the blaster shall inspect the holes and review the drilling logs prior to
loading the holes.
B. Deepen or clean-out blast holes if they are plugged or unable to be fully
loaded. Check and measure blast holes before any explosives are loaded into any
of the holes to eliminate any safety hazard resulting from drilling near loaded
holes.
C. Maintain a burden distance that is equal to or less than the bench height in
order to control the blasting effects.
D. Drill the row of production blast holes immediately adjacent to the controlled
blast line on a plane approximately parallel to the controlled blast line. Drill the
production blast holes no closer than 6 feet (2 m) to the controlled blast line. Drill
the bottom of the production holes no lower than the bottom of the controlled blast
holes except by the amount of subdrilling used in the production holes. Do not
exceed 6 3/4 inches (170 mm) in diameter for the production blast holes. Delay the
detonation sequence of the production holes toward a free face.
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