WHERE: GARRARD COUNTY HIGH SCHOOL
WHEN: MARCH 13TH, 2023 THROUGH THE END OF MAY 2023 (WEATHER
WHO: R.L. CAUDILL CONSTRUCTION INC.
WHAT TO EXPECT:
The blasting operations will be conducted Monday through Friday between 4:30 pm and 6:00
pm unless personnel or property safety forces time adjustments. At this point a notice will be
provided as promptly as possible to notify the public of a blast prior to the times listed above.
Kentucky 805 KAR 4:060 Section 1. (3) blasting operation shall be conducted during daylight
hours (1/2 hour before sunrise and 1/2 hour after sunset) except by special permit issued by
the Department of Mines and Minerals. Said permit shall be based on safety.
For all blasting activity, RLCC will utilize two-way radio communication between the blaster in
charge and all spotters. The blasting area will be checked prior to pulling the firing lead line to
the blaster’s safe location. Once the blast area has been deemed clear, the blaster shall
hook his lead line and move to his safe location. The blaster will then check with the spotters
to verify that all roads are blocked and that all personnel are accounted for and are
protected. After receiving verification from all spotters, the blaster shall commence with the
blasting signals. Prior to the one-minute blast signal, the blast will check once again with the
spotters to verify all locations are still clear and safe. Once the blast has been fired, the
spotters shall hold all personnel until given the “all clear” signal from the blaster.
The following blasting signals shall be used:
WARNING SIGNAL – A one minute series of long horn or siren blasts five minutes prior to the
BLAST SIGNAL – A series of short horn or siren blasts one minute prior to the shot.
ALL CLEAR SIGNAL – A prolonged horn or siren blast following the inspection of the blast area.
These blasting signals will be posted in a conspicuous location on the job site and all
employees will be required to familiarize themselves with the signals. Danger signs will be
posted at suitable locations about the job site.
VIBRATION CONTROL, MONITORING, AND REPORTING:
Vibration and air blast levels from blasting will be measured by RLCC at the nearest structures.
Peak particle velocity will not exceed 2 ips nor a residual of 25% of the peak particle velocity
after one second at any monitoring station. The state regulated maximum velocity for
construction blasting in Kentucky is 2.0ips. This is a conservative regulation intended to keep
all blasting related vibrations below the damage threshold of drywall cracks. Drywall normally
being the first thing in a house to show signs of damage.
Blast data for each blast, including hole layout and timing sequence will be recorded on the
shot report. The completed blast form, in conjunction with the printed seismograph records
will comprise a complete record of each blast. The complete record of each blast shall be
filled out daily and submitted to the Engineer as requested.
FLY ROCK PREVENTION:
All blasts shall be designed to minimize the potential for fly rock. Drill cuttings or crushed stone
stemming materials shall be used in an amount that is adequate to confine the explosive
energy in the borehole as determined by the blaster in charge.
Blasting mats will be used to control potential fly rock where necessary.
Jeffrey A. Williams