Illinois Administrative Code › Title 62 - MINING › Part 300 - SURFACE MINED LAND CONSERVATION AND RECLAMATION ACT › Subpart B - USE OF EXPLOSIVES IN NON-COAL MINERAL EXTRACTION OPERATIONS › Section 300.220 - Monitoring

Current through Register Vol. 48, No. 28, July 12, 2024
a) Duties of the
				Operator
1) When the scaled distance has a
				value less than 65 at the closest protected structure, the operator shall make
				a seismographic recording and airblast recording at or as near as possible to
				that structure.
2) When any blast
				is within 500 feet of a landfill, the operator shall make a seismograph
				recording at or near the closest part of the landfill to the blast. This
				requirement shall not apply if a protected structure is located between the
				blast and the landfill or if an alternative compliance method has been approved
				by the Department in accordance with Section
				300.225(f).
3) When the cubed root scaled distance to the
				nearest protected structure has a value less than 350 and when the burden to
				hole depth ratio is greater than 1.0, or the top stemming height is less than
				70% of the burden dimension, the airblast produced by the blast shall be
				measured at or as near as possible to the closest protected
				structure.
4) When field programmed
				times of electronic, or programmable detonators are unable to be electronically
				documented or verified in subsection (a)(5)(a)(xiv), the operator shall make a
				seismographic and airblast recording for Department review, at or as near as
				possible to the closest protected structure.
5) The operator shall maintain blasting
				records as follows:
A) A record of each blast
				shall be made, retained by the operator for at least five years and made
				available for inspection by the Department. Each blast record, as well as other
				documentation deemed relevant to that record, shall not be falsified or
				misrepresented. Units of measure shall be included on each blast record. The
				blast record should be based on the maximum pounds in any given hole in the
				blast. Records of blasts conducted since the Department's last inspection, or
				copies of such blasting records, shall be made available at the operation for
				inspection by the Department. The record is to be completed by the end of the
				work day following the day in which the blast occurred, including the
				seismograph meter reading, if required, and shall contain the following data:
i) Name of the mine operator for whom the
				blast is being conducted.
ii) The
				location, using global positioning data points, date and time of the
				blast.
iii) Name, signature and
				licensure number of the licensed blaster responsible for the blast.
iv) Type of material blasted.
v) Number of holes, burden and
				spacing.
vi) Diameter and depth of
				holes.
vii) Type and amount of each
				explosive used, including any variation from the heaviest hole.
viii) Total weight of explosives used in
				pounds.
ix) Maximum weight, in
				pounds, of explosives used in any one hole.
x) Maximum weight of explosives, in pounds,
				detonated within any eight millisecond period.
xi) Maximum number of holes or explosive
				decks detonated within any eight millisecond period.
xii) Initiation system, including number of
				circuits and the timer interval, if a sequential timer is used.
xiii) Type and length of stemming (deck and
				top).
xiv) Type of detonator and
				delay periods used, in milliseconds. When electronic or programmable detonators
				are used, field programmed times shall be documented utilizing a date stamp
				which is derived from the machine used to detonate the blast. This
				documentation should be representative of the firing times at the instant of
				detonation. This documentation is not required when detonators are
				pre-programmed by the manufacturing facility with labels indicating, in
				milliseconds, the nominal firing time.
xv) Sketch of delay pattern, including
				decking, which indicates all hole to hole connections and the firing times of
				each hole as well as a directional indicator.
xvi) Distance and scaled distance to the
				closest protected structure, using global positioning data points.
xvii) Location, using global positioning data
				points, of the closest protected structure.
xviii) Distance and scaled distance to the
				closest part of any landfill within 500 feet of the blast.
xix) A hole diagram indicating borehole
				depth, subdrill, borehole diameter, type and length of stemming, primer
				location, location and size of inert decks, weight and type of explosives used
				per explosive column.
xx) List of
				persons assisting with blast loading and initiation.
xxi) Drill log showing the physical
				characteristics of each hole.
xxii)
				Seismograph recordings of airblast and ground vibration, when
				required.
xxiii) Seismograph
				identification number.
xxiv) The
				type of seismograph, sensitivity, and certification date of annual calibration
				which must be conducted within one year of the previous calibration
				date.
B) Air blast and/or
				ground vibration recordings, or photographic copies thereof, where required by
				the Department, shall be kept for a period of five years following the date of
				the blast, and shall be available for inspection by the Department. Records of
				blasts conducted since the Department's last inspection, or copies of such
				blasting records, shall be made available at the operation for inspection by
				the Department. The recordings shall include the following information:
i) Maximum airblast and/or ground vibration
				levels recorded.
ii) The specific
				location of the monitoring equipment, its distance from the blast and the date
				and time of the recording.
iii)
				Name of the person and/or firm making the recording.
iv) Name of the person and/or firm analyzing
				the recordings.
v) The type of
				seismograph, sensitivity and certification date of annual calibration which
				must be conducted within one year of the previous calibration
				date.
C) As used herein,
				"seismographic recording", or "record of airblast recording", or "record" shall
				mean a visually inspectable cartesian representation of the time history of the
				particle velocity levels and/or airblast levels versus time. The particle
				velocity is shown by three traces representing mutually perpendicular
				components of motion. The components are oriented vertically, transversely and
				longitudinally to the horizontal direction from the recording location to the
				location of the blast. The airblast time history is represented by a single
				trace. The record or recording includes either an analog representation, or a
				written description, of the vertical scale for the particle velocity traces and
				the airblast trace. The units for the particle velocity traces and scale are in
				inches per second. The units for the airblast trace and scale are millibars,
				pounds per square inch, or decibels. The recording shall also include an analog
				or descriptive time scale. The time units are in
				seconds.