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

208.16
1. Identification of instrument used.
2. Name of approved observer and interpreter.
3. Distance and direction of recording station from blast area.
4. Type of ground at recording station and material on which the
instrument is sitting.
D. Ensure that the peak particle velocity of each component of the safe limits of
the nearest structure subject to vibration damage is not exceeded.
E. The vibration specialist may elect to summarize and report this information
monthly, when the blaster measures the vibration and airblast with its own
seismograph and reports the measurements on the vibration specialist’s
seismographs.
F. Establish what vibration limits are being used and explain why they are being
used to the Engineer before blasting begins near structures denoted in the pre-blast
survey in 208.14.
G. Stop all operations if the vibration limits are exceeded until the vibration
specialist reports to the Engineer that no damage has occurred or will occur and
that corrective action has been taken to lower the vibration.
208.16 Airblast and Noise Control. If specified in the Contract, install an
airblast monitoring system between the main blasting area and the nearest structure
subject to blast damage or annoyance.
Retain an experienced airblast and noise control specialist. Use an airblast and
noise control specialist with at least 5 years of proven experience in airblast and
noise control on heavy construction highway rock blasting projects and with a
sufficient amount of proven experience of the type of rock blasting airblast and
noise control monitoring required by the Contract. Use an airblast and noise
control specialist that is an expert in airblast and noise control. The Contractor
shall not use an airblast and noise control specialist 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 airblast and noise control specialist. Include in the resume a list of
at least five heavy construction or highway rock blasting projects on which the
airblast and noise control specialist was responsibly in charge of the airblast and
noise control of the rock blasting operations. List a description of the projects,
with details of the airblast and noise control monitoring made on 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 airblast
and noise control specialist before beginning any drilling and blasting work.
Allow 30 days for the review of this documentation.
The airblast and noise control specialist shall perform the following:
A. Use equipment of the type specifically manufactured for the purpose to make
the airblast measurements. Hold peak overpressure below 134 dB at the nearest
structure or other designated location. Lower the overpressure limit if it proves too
high based on damage or complaints.
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