Current through Vol. 42, No. 1, September 16, 2024
(a) All
blasting shall be conducted between sunrise and sunset.
(1) The Department may specify more
restrictive time periods, based upon public requests or other relevant
information, according to the need to adequately protect the public from
adverse noise.
(2) Blasting may,
however, be conducted between sunset and sun rise if:
(A) A blast that has been prepared during the
afternoon must be delayed due to the occurrence of an unavoidable hazardous
condition and cannot be delayed until the next day because a potential safety
hazard could result that cannot be adequately mitigated;
(B) A complete written report of blasting at
night is filed by the operator with the Department not later than three days
after the night blasting. The report shall include the reasons for the delay in
blasting, including why the blast could not be held over to the next day, when
the blast was actually conducted, the warnings signs given, and a copy of the
blast report required by Section
460:10-31-10.
(b) Warning and
all-clear signals of different character from the point of the blast shall be
given. Persons within the permit area blasting site shall be notified of the
meaning of the signals through the methods specified in Section
460:10-31-7.
(c) Access to an area possibly subject to
flyrock from blasting shall be regulated to protect the public and livestock.
Access to the area shall be controlled to prevent the presence of livestock or
unauthorized personnel during blasting and until an authorized representative
of the operator has reasonably determined:
(1)
That no unusual circumstances, such as imminent slides or undetonated charges,
exist; and
(2) That access to and
travel in or through the area can be safely resumed.
(d) Except where lesser distances are
approved by the Department, based upon a pre-blasting survey, seismic
investigation, or other appropriate investigation, blasting shall not be
conducted within:
(1) 300 feet of any building
used as a dwelling, school, church, hospital, or nursing facility; or
(2) 500 feet of facilities including, but not
limited to, disposal wells, petroleum or gas - storage facilities, municipal
water-storage facilities, fluid transmission pipelines, gas or oil collection
lines, or water and sewerage lines.
(3) Any mining operation actively mining on
the effective date of these regulations which conducts blasting activities
closer than the above distances is exempt from the provisions of (d) (1) and
(d) (2) of this Section with regard to the structures or facilities to which
these blasting operations take place.
(e) Flyrock shall not be cast from the
permitted area.
(f) Blasting shall
be conducted to prevent injury to persons, damage to public or private property
outside the permit area, adverse impacts to any underground mine, and change in
the course, channel, or availability of surface water outside the permit
area
(g) In all blasting
operations, except as otherwise authorized in this Section, the maximum peak
particle velocity shall not exceed 1 inch per second at the location of any
dwelling, public building, school, church, or commercial or institutional
building.
(h) If blasting is
conducted to prevent adverse impacts on any underground mine and changes in the
course, channel, or availability of ground or surface water outside the permit
area, then the maximum peak particle velocity limitation shall not apply at the
following locations:
(1) At structures owned
by the operator and not leased to another party; and
(2) At structures owned by the operator and
leased to another party, if a writtenwaiver by the lessee is submitted to the
Department prior to blasting.
(i) An equation for determining the maximum
weight of explosives that can be detonated within any 8-millisecond period is
in (j) of this Section. If the blasting is conducted in accordance with this
equation, the peak particle velocity is deemed the 1-inch-per-second
limit.
(j) The maximum weight of
explosives to be detonated within any 8-millisecond period may be determined by
the formula W=(d/60)2 square where W = the maximum weight of explosives, in
pounds, that can be detonated in any 8-millisecond period, and D = the
distance, in the feet, from the blast to the nearest dwelling, school, church,
or commercial or institutional building. For distances between 300 or 5,000
feet, using ANFO or the equivalent solution of the equation results in the
following maximum weights:
(1) For distance of
300 feet, maximum weight is 25 pounds.
(2) For distance of 350 feet, maximum weight
is 34 pounds.
(3) For distance of
400 feet, maximum weight is 44 pounds.
(4) For distance of 500 feet, maximum weight
is 69 pounds.
(5) For distance of
600 feet, maximum weight is100 pounds.
(6) For distance of 700 feet, maximum weight
is 136 pounds.
(7) For distance of
800 feet, maximum weight is 178 pounds.
(8) For distance of 900 feet, maximum weight
is 225 pounds.
(9) For distance of
1000 feet, maximum weight is 278 pounds.
(10) For distance of 1,100 feet, maximum
weight is 336 pounds.
(11) For
distance of 1,200 feet, maximum weight is 400 pounds.
(12) For distance of 1,300 feet, maximum
weight is 469 pounds.
(13) For
distance of 1,400 feet, maximum weight is 544 pounds.
(14) For distance of 1,500 feet, maximum
weight is 625 pounds.
(15) For
distance of 1,600 feet, maximum weight is 711 pounds.
(16) For distance of 1,700 feet, maximum
weight is 803 pounds.
(17) For
distance of 1,800 feet, maximum weight is 900 pounds.
(18) For distance of 1,900 feet, maximum
weight is 1,002 pounds.
(19) For
distance of 2,000 feet, maximum weight is 1,111 pounds.
(20) For distance of 2,500 feet, maximum
weight is 1,736 pounds.
(21) For
distance of 3,000 feet, maximum weight is 2,500 pounds.
(22) For distance of 3,500 feet, maximum
weight is 3,403 pounds.
(23) For
distance of 4,000 feet, maximum weight is 4,444 pounds.
(24) For distance of 4,500 feet, maximum
weight is 5,625 pounds.
(25) For
distance of 5,000 feet, maximum weight is 6,944 pounds.
(k)
Airblast limitations.
Airblast may not exceed the maximum limits listed below, unless Departmentally
approved, at the location of any dwelling, public building, school, church, or
community or institutional building outside the permit area.
(l)
Frequency level. The lower
frequency limit Maximum level, of measuring system, in dB in Hz(+/-3 dB) must
be the following:
(1) 0.1 Hz or lower-flat
response must be 134 peak.
(2) 2 Hz
or lower-flat response must be 133 peak.
(3) 6 Hz or lower-flat response must be 129
peak.
(4) C-weighted-slow response
must be105 peak dBC.
