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

208.13
E. Use appropriate blast hole patterns, detonation systems, and stemming to
prevent venting of blasts and to minimize airblast and noise levels produced by the
blasting operations.
F. Carry out the trial blasts according to the blasting test section requirements of
208.07.
G. Report the vibrations (velocity and frequency) and airblasts on both
seismographs before the next blast. This report shall denote whether or not these
numbers exceeded the allowable set by the vibration specialist.
H. Modify 208.12.A through 208.12.F above as required to limit ground
vibrations and airblast to the levels established by the vibration specialist, and the
airblast and noise control specialist.
I. Coordinate and review the blast hole layout and drilling operations.
The blaster, blasting contractor, or the contractor shall obtain insurance as
specified in 107.12. Present a certificate of insurance 10 days before the blasting
operations begin.
208.13 Blasting Consultant. If specified in the Contract, retain an
experienced and recognized blasting consultant to assist in the blast design. The
blasting consultant shall assist in the design of both the controlled and production
blasting.
Retain a blasting consultant with at least 5 years of proven experience in heavy
construction or highway rock blasting design and with a sufficient amount of
proven experience of the type of highway rock blasting design required by the
Contract. The Contractor shall not use a blasting consultant that is an employee of
the Contractor, explosives manufacturer, or explosives distributor.
Before or at the preconstruction conference, submit a resume of the credentials
of the proposed blasting consultant. Include in the resume a list of at least five
heavy construction or highway rock blasting projects on which the blasting
consultant was responsibly in charge of the rock blasting design. List a description
of the projects, with details of the blast plans and modifications made during the
project. List the names and telephone numbers of project owners with sufficient
knowledge of the projects to verify the submitted information. Obtain approval of
the blasting consultant before beginning any drilling and blasting work. Allow 30
days for the review of this documentation.
The blasting consultant shall observe the loading, drilling, or blasting operations
for at least 8 hours per week if these operations are in progress for 40 or more
hours per week. The blasting consultant shall witness the drilling, loading and
blasting of the first shot in each major cut. At a minimum, the blasting consultant
shall witness the drilling, loading and blasting of every 20 th shot on the project.
The blasting consultant shall write a written report to the Engineer at least once a
month detailing the blasting operations. The time spent writing this report is not
considered part of the time required to observe the loading, drilling, and blasting
operations. The Contractor shall coordinate the blasting consultant’s hours with
the Engineer.
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