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

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208.14
208.14 Pre-Blast Condition Survey. If specified in the Contract, conduct a
pre-blast survey of any buildings, structures, or utilities within 1500 feet (460 m)
or to the nearest structure up to 1/2-mile (0.8 km) radius of the blasting operations.
Use a greater radius if the structures are potentially at risk from blasting damage.
The Contractor shall use a survey method acceptable to its insurance company.
The Contractor is responsible for any damage resulting from blasting.
If owners or occupants fail to allow access to the property for the pre-blast
survey, send a certified letter to the owner or occupant. Make the notification
effort and the certified letter part of the pre-blast survey records.
Submit a copy of the pre-blast survey records to the Engineer before beginning
the blasting operations at the critical blasting locations.
Notify occupants of local buildings before the commencement of blasting.
208.15 Vibration Control and Monitoring. If specified in the Contract, use
vibration control and monitoring if blasting near buildings, structures, or utilities
that may be subject to damage from blast induced ground vibrations. The
vibration specialist interprets the seismograph records to ensure that the
seismograph data is effective in the control of the blasting operations with respect
to the existing structures.
Retain an experienced vibration specialist to establish the safe vibration limits.
Use a vibration specialist with at least 5 years of proven experience in monitoring
vibrations on heavy construction or highway rock blasting projects and with a
sufficient amount of proven experience of the type of highway rock blasting
vibration monitoring required by the Contract.
Use a vibration specialist that is an expert in the interpretation of the vibration
data. The Contractor shall not use a vibration 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 vibration specialist. Include in the resume a list of at least five
heavy construction or highway rock blasting projects on which the vibration
specialist was responsibly in charge of monitoring the rock blasting vibrations.
List a description of the projects, with details of the vibration interpretations 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 vibration specialist before beginning any drilling and blasting
work. Allow 30 days for the review of this documentation.
The vibration specialist shall perform the following:
A. Monitor each blast with an approved seismograph located between the blast
area and the closest structure subject to blast damage.
B. Use a seismograph capable of recording particle velocity for three mutually
perpendicular components of vibration in the range generally found with
controlled blasting.
C. Furnish the data recorded for each shot before the next blast and include the
following: