Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 900 - GENERAL PROVISIONS › Section 900.101 - Definitions

Current through Register Vol. 48, No. 28, July 12, 2024
Except as stated and unless a different meaning of a term is
				clear from its context, the definitions of terms used in this Chapter are the
				same as those used in the Environmental Protection Act. All definitions of
				acoustical terminology not specifically defined in this Chapter will have
				meanings ascribed in ANSI/ASA S1.1 -2013
				"Acoustical Terminology" and S12.9 -2013/Part 1 "Quantities and Procedures for
				Description and Measurement of Environmental Sound - Part 1: Basic Quantities
				and Definitions", incorporated by reference at Section
				900.106.
				As used in 35 Ill. Adm. Code 900 through 910, the following terms mean:
"A-weighted sound level": 10 times the logarithm to the base 10
				of the square of the ratio of the A-weighted (and time-averaged) sound
				pressure, to the reference sound pressure of 20 micropascals. The frequency and
				time weighting must be specified in compliance with ANSI/ASA S1.4 -2014/Part
				1/IEC 61672:1-2013 "American National Standard Electroacoustics Sound Level
				Meters-Part 1: Specifications (a nationally adopted international standard",
				incorporated by reference at Section 900.106. The unit of sound level is the
				decibel (dB) with the letter (A) appended to the decibel unit symbol to
				indicate the frequency weighting and written as dB(A).
"Ambient": the all-encompassing sound associated with a given
				environment without contributions from the noise source or sources of
				interest.
"Angle of incidence": the orientation of the microphone
				relative to the sound source.
"ANSI": American National Standards Institute or its
				successor.
"Antique vehicle": a motor vehicle that is more than 25 years
				old or its bona fide replica, and which is driven on the highways only going to
				and returning from an antique auto show or an exhibition, or for servicing or
				demonstration, or a fire-fighting vehicle that is more than 20 years old which
				is not used as fire-fighting equipment but is used only for exhibition or
				demonstration.
"ASA": Acoustical Society of America.
"Background ambient sound level": the ambient sound level,
				measured in compliance with the procedures specified in 35 Ill. Adm. Code
				910.
"Bus": a motor vehicle designed for carrying more than 10
				passengers and used for the transportation of passengers; and any motor
				vehicle, other than a taxicab, designed and used for the transportation of
				persons for compensation.
"C-weighted sound level": in decibels, a frequency-weighted
				sound pressure level, determined using the metering characteristics and
				C-weighted network specified in ANSI/ASA S1.4-2014/Part 1/IEC 61672:1-2013
				"American National Standard Electroacoustics Sound Level Meters - Part 1:
				Specifications (a nationally adopted international standard)", incorporated by
				reference at Section 900.106.
"Common carrier by motor vehicle": any person holding itself
				out to the general public to provide, for compensation, transportation of
				passengers or property in interstate or foreign commerce by motor vehicle,
				whether over regular or irregular routes.
"Construction": on-site erection, fabrication, installation,
				alteration, demolition or removal of any structure, facility, or its addition,
				including all related activities, such as, clearing of land, earth-moving,
				blasting and landscaping.
"Contract carrier by motor vehicle": any person, other than
				"common carrier by motor vehicle", who provides, for compensation,
				transportation of passengers or property in interstate or foreign commerce by
				motor vehicle under contracts with one person or a limited number of persons,
				either:
to provide transportation services through the assignment of
				motor vehicles to the exclusive use of a served person for a specific period of
				time; or
to provide transportation services designed to meet a distinct
				need of an individual customer.
"Daytime hours": 7:00 am to 10:00 pm, local time.
"dB(A)": A-weighted decibels (see the definition of "A-weighted
				sound level").
"Dealer": any person engaged in the business of selling
				vehicles to persons who purchase these vehicles for purposes other than resale,
				and who has an established place of business for such activity in this
				State.
"Decibel" or "dB": a unit of measure, on a logarithmic scale to
				the base 10, of the ratio of a sound pressure magnitude to a standard reference
				pressure, which, for purposes of this Chapter, is 20 micronewtons per square
				meter (µN/m2) or 20 micropascals
				(µPa).
"Discrete tone": a sound whose instantaneous sound pressure
				varies essentially as a simple sinusoidal function of time.
"Exhaust system": the system comprised of a combination of
				components which provides for the enclosed flow of exhaust gas from engine
				parts to the atmosphere.
"Existing property-line noise source": any property-line noise
				source, the construction or establishment of which commenced prior to August
				10, 1973, excluding, any property-line noise source whose A, B or C land use
				classification changes on or after August 10, 1973.
"Farm tractor": a motor vehicle designed and used primarily as
				a farm implement for drawing wagons, plows, mowing machines and other
				implements of husbandry, and any self-propelled implement of husbandry.
"Fast dynamic characteristic": the dynamic characteristic
				specified as fast in ANSI/ASA S1.4-2014/Part 1/IEC 61672:1-2013 "American
				National Standard Electroacoustics Sound Level Meters - Part 1: Specifications
				(a nationally adopted international standard)", incorporated by reference at
				Section 900.106.
"Fast meter response": as specified in ANSI/ASA S1.4-2014/Part
				1/IEC 61672:1-2013 "American National Standard Electroacoustics Sound Level
				Meters - Part 1: Specifications (a nationally adopted international standard)",
				incorporated by reference at Section 900.106.
"Fluctuating sound": a class of non-steady sound where sound
				pressure level varies over a range greater than 6 decibels (dB) with the "slow"
				meter characteristic, and where the meter indication does not equal the ambient
				level more than once during the period of observation.
"Frequency-weighted sound pressure": root mean square of the
				instantaneous sound pressure which is frequency-weighted (i.e., filtered) with
				a standard frequency characteristic (e.g., A or C) and exponentially
				time-weighted in compliance with the standardized characteristics slow (S),
				fast (F), impulse (I) or peak, with both weightings specified in compliance
				with ANSI S1.4-2014/Part 1/IEC 61672:1-2013 "American National Standard
				Electroacoustics Sound Level Meters - Part 1: Specifications (a nationally
				adopted international standard)", incorporated by reference at Section 900.106.
				The frequency weighting used must be specified explicitly (e.g., A, C or octave
				band). The unit frequency-weighted sound pressure is the pascal (Pa).
"Gross combination weight rating": the value specified by the
				manufacturer as the loaded weight of a combination vehicle.
"Gross vehicle weight" or "GVW": the maximum loaded weight for
				which a motor vehicle is registered, or, for vehicles not so registered, the
				value specified by the manufacturer as the loaded weight of the vehicle.
"Gross vehicle weight rating" or "GVWR": the value specified by
				the manufacturer as the loaded weight of a single vehicle.
"Highly impulsive sound": either a single pressure peak or a
				single burst (multiple pressure peaks) for a duration usually less than one
				second. Examples of highly impulsive sound sources are drop forge hammer and
				explosive blasting.
"Highway": the entire width between the boundary lines of every
				way publicly maintained when any part of it is open to public use vehicular
				travel.
"IEC": International Electrotechnical Commission.
"IHRA": International Hot Rod Association or its successor
				body.
"Intermittent sound": a class of non-steady sound where the
				meter indicates a sound pressure level equal to the ambient level two or more
				times during the measurement period. The period during which the sound level
				value remains different from the ambient for at least one second.
"LBCS": the Land-Based Classification Standards which designate
				land use functions by numeric codes.
"Leq": equivalent continuous sound
				pressure level in decibels: 10 times the logarithm to the base 10 of the ratio
				of a time mean square sound pressure, during the specified time period, to the
				square of reference sound pressure. The reference sound pressure is 20
				micronewtons per square meter or equivalent continuous frequency-weighted sound
				pressure.
"Leq (A)": A-weighted time-average
				(equivalent-continuous) sound pressure level.
"Leq (octave band-Hz)": time-average
				(equivalent-continuous) sound pressure level in the octave band specified by
				its center frequency (e.g. Leq (125-Hz)).
"Measurement period": the time interval during which acoustical
				data are obtained. The measurement period is determined by the characteristics
				of the noise being measured and must be at least ten times as long as the
				response time of the instrumentation. The greater the variation in indicated
				sound level, the longer must be the observation time for a given expected
				precision of the measurement.
"Motor carrier": a common carrier by motor vehicle, a contract
				carrier by motor vehicle, or a private carrier of property by motor vehicle.
				The term "motor carrier" includes those persons that own and operate the
				subject motor vehicles, but not their drivers, unless the drivers both own and
				drive their own vehicles.
"Motor driven cycle": a motorcycle, motor scooter, or bicycle
				with motor attached, with less than 150 cubic centimeter piston
				displacement.
"Motor vehicle": a self-propelled vehicle and any combination
				of vehicles propelled or drawn by a self-propelled vehicle.
"Motorcycle": a motor vehicle with a seat or saddle for the
				rider and designed to travel on up to 3 wheels in contact with the ground, but
				excluding a tractor.
"Muffler": a device for abating the sounds of escaping gases of
				an internal combustion engine.
"New snowmobile": a snowmobile, the equitable or legal title to
				which has passed exclusively to persons purchasing it for resale only.
"Nighttime hours": 10:00 pm to 7:00 am, local time.
"Noise floor": the electrical noise (in decibels) of the sound
				measurement system. When the noise floor is determined by placing a calibrator
				over the microphone of the sound measurement system, the noise floor may
				include acoustic noise due to leakage around the calibrator.
"Noise pollution": the emission of sound that unreasonably
				interferes with the enjoyment of life or with any lawful business or
				activity.
"Non-steady sound": a sound whose sound pressure level shifts
				significantly during the measurement period with meter variations greater than
				±3 dB using the "slow" meter characteristic.
"Octave band sound pressure level": the sound pressure level
				for the measured sound contained within the specified octave band. The
				reference pressure is 20 micronewtons per square meter
				(µN/?2) or 20 micropascals (µPa).
"Open site": an area that is essentially free of large
				sound-reflecting objects, such as barriers, walls, board fences, signboards,
				parked vehicles, bridges or buildings.
"Pascal" or "Pa": a unit of pressure. One pascal is equal to
				one newton per square meter.
"Passenger car": a motor vehicle designed to carry up to 10
				persons, including a multi-purpose passenger vehicle, except any motor vehicle
				of the second division as defined in
				625 ILCS 5/1-146,
				and except any motorcycle or motor driven cycle.
"Person": any individual, corporation, partnership, firm,
				association, trust, estate, public or private institution, group, agency,
				political subdivision of this State, any other state or a political subdivision
				or agency of that state, or any legal successor, representative, agent or
				agency of the foregoing.
"Preferred frequencies": frequencies in Hertz preferred for
				acoustical measurements which, for the purposes of this Chapter, consist of the
				following set of values: 20, 25, 31.5, 40, 50, 63, 80, 100, 125, 160, 200, 250,
				315, 400, 500, 630, 800, 1000, 1250, 1600, 2000, 2500, 3150, 4000, 5000, 6300,
				8000, 10,000, 12,500.
"Private carrier of property by motor vehicle": any person,
				other than "common carrier by motor vehicle" or "contract carrier by motor
				vehicle", who transports in interstate or foreign commerce by motor vehicle any
				property owned, leased, or bailed by that person.
"Prominent discrete tone": a sound with 1/3 octave band sound
				pressure level that, when measured at a preferred frequency, exceeds, by any of
				the following values, the arithmetic average of the sound pressure levels of
				both adjacent 1/3 octave bands:
A value of 5 dB or more for a 1/3 octave band with a center
				frequency from 500 Hertz to 10,000 Hertz, inclusive, but only if that 1/3
				octave band sound pressure level also exceeds the sound pressure level of each
				adjacent 1/3 octave band;
A value of 8 dB or more for a 1/3 octave band with a center
				frequency from 160 Hertz to 400 Hertz, inclusive, but only if that 1/3 octave
				band sound pressure level also exceeds the sound pressure level of each
				adjacent 1/3 octave band; or
A value of 15 dB or more for a 1/3 octave band with a center
				frequency from 25 Hertz to 125 Hertz, inclusive, but only if that 1/3 octave
				band sound pressure level also exceeds the sound pressure level of each
				adjacent 1/3 octave band.
BOARD NOTE: A sound measured at a preferred frequency of 400
				Hz, for example, would be a prominent discrete tone only if its 1/3 octave band
				sound pressure level (1) exceeds the 1/3 octave band sound pressure level of
				315 Hz; (2) exceeds the 1/3 octave band sound pressure level of 500 Hz; and (3)
				exceeds by 8 dB or more the arithmetic average of the 1/3 octave band sound
				pressure levels of 315 Hz and 500 Hz.
"Property-line noise source": any equipment or facility, or a
				combination of equipment and facility, that operates within any land used as
				specified by 35 Ill. Adm. Code
				901.101.
				The equipment or facility, or combination of equipment and facility, must be
				capable of emitting sound beyond the property line of the land on which it is
				operated.
"Quasi-steady sound": a train of two or more acoustical
				impulses. Examples of quasi-steady sound are that from riveting and pneumatic
				hammer.
"Reflective surface": any building, hillside, or similar object
				(other than the flat ground surface) that reflects sufficient sound to affect
				the sound pressure level readings obtained from a noise source, excluding small
				objects such as trees, posts, chain-linked fences, fire hydrants, vegetation
				(such as bushes and shrubs), or any similar object.
"Registered": a vehicle is registered when a current
				registration certificate or certificates and registration plates have been
				issued for it under the laws of any state pertaining to the registration of
				vehicles.
"Residential dwelling unit": all land used as specified by the
				Land-Based Classification Standards (LBCS) Codes 1100 through 1340; and those
				portions of land used as specified by LBCS Code 6222 that are used for sleeping
				(see 35 Ill. Adm. Code 901.Appendix B).
"SAE": Society of Automotive Engineers.
"Slow dynamic characteristic": the dynamic characteristic
				specified as "Slow" in ANSI/ASA S1.4-2014 "American National Standard
				Specification for Sound Level Meters - Part 1", incorporated by reference at
				Section 900.106.
"Snowmobile": a self-propelled device designed for travel on
				snow or ice or natural terrain steered by skis or runners, and supported in
				part by skis, belts, or cleats.
"Sound": a physical disturbance causing an oscillation in
				pressure in a medium (e.g., air) that is capable of being detected by the human
				ear or a sound measuring instrument.
"Sound exposure" or "SE": time integral of squared,
				frequency-weighted instantaneous sound pressure over a given time interval. The
				time period of integration must be specified if: the sound exposure of the
				background noise is a significant contributor to the total sound exposure; the
				threshold sound level of the instrument (a level below which the instrument
				does not accumulate contributions to the integral) used is above the level of
				the background noise; such data is needed to identify a source; or the time
				period of integration is otherwise useful. The customary unit for sound
				exposure is pascal-squared second (Pa2-s).
"Sound exposure level" or "SEL" or
				"LeT": 10 times the logarithm to the base 10 of the
				ratio of sound exposure to the reference sound exposure
				(Eo) of 400 micropascal-squared seconds
				(µPa2-s). For a given measurement time period
				of T seconds, the sound exposure level (LeT) is related
				to the time-average sound level (LpT) as follows:
				LeT =LpT + log
				(T/to) where to is the reference
				duration of 1 second. The time period of integration (T) must be specified. The
				frequency weighting used must be specified explicitly (e.g., A, C or octave
				band). The A-weighted SEL and C-weighted SEL are abbreviated ASEL and CSEL
				respectively. An octave band SEL is expressed in terms of the center frequency
				(e.g., SEL at 125-Hz). The unit for sound exposure level is decibel
				(dB).
"Sound level" or "weighted sound pressure level": 20 times the
				logarithm to the base 10 of the ratio of the frequency-weighted (and
				time-averaged) sound pressure to the reference pressure of 20 micropascals. The
				frequency weighting used must be specified explicitly (e.g., A, C or octave
				band). The unit for sound level is decibel (dB).
"Sound pressure": the root mean square of the instantaneous
				sound pressures during a specified time interval in a stated frequency band.
				The unit for sound pressure is pascal (Pa).
"Sound pressure level": 20 times the logarithm to the base 10
				of the ratio of the particular sound pressure to the reference sound pressure
				of 20 micropascals. ANSI S12.9-2013/Part 1 "Quantities and Procedures for
				Description and Measurement of Environmental Sound - Part 1: Basic Quantities
				and Definitions", incorporated by reference at Section 900.106, reserves the
				term sound pressure level to denote the unweighted sound pressure. The unit for
				sound pressure level is decibel (dB).
"Special mobile equipment": every vehicle not designed or used
				primarily for the transportation of persons or property and only incidentally
				operated or moved over a highway, including: ditch digging apparatus,
				well-boring apparatus and road construction and maintenance machinery, such as
				asphalt spreaders, bituminous mixers, bucket loaders, tractors other than truck
				tractors, leveling graders, finishing machines, motor graders, road rollers,
				scarifiers, earth-moving carryalls and scrapers, power shovels and drag lines,
				and self-propelled cranes and other earth-moving equipment.
"Steady sound": a sound whose sound pressure level remains
				essentially constant (that is, meter fluctuations are negligibly small) during
				the measurement period with meter variations up to ±3 dB using the
				"slow" meter characteristic.
"Tactical military vehicle": every vehicle operated by any
				federal or state military organization and designed for use in field
				operations, but not including vehicles such as staff cars and personnel
				carriers designed primarily for normal highway use.
"Time-average sound level" or "equivalent-continuous sound
				level" or "equivalent-continuous frequency-weighted sound pressure level": 20
				times the logarithm to the base 10 of the ratio of the time-average
				(frequency-weighted) sound pressure to the reference pressure of 20
				micropascals. The frequency weighting used must be specified explicitly (e.g.,
				A, C or octave band). The unit of time-average sound level is the decibel
				(dB).
"Time-average (frequency-weighted) sound pressure": square root
				of the quotient of the time integral of frequency-weighted squared
				instantaneous sound pressures divided by the time period of integration; or the
				square root of the quotient of the sound exposure, in pascal-squared seconds
				(Pa2-s), in a specified time period, divided by the
				time period of integration in seconds. The frequency weighting used must be
				specified explicitly (e.g., A, C or octave band). The unit of time-average
				sound pressure is the pascal (Pa).
"Unregulated safety relief valve": a safety relief valve used
				and designed to be actuated by high pressure in the pipe or vessel to which it
				is connected and that is used and designed to prevent explosion or other
				hazardous reaction from pressure buildup, rather than being used and designed
				as a process pressure blowdown.
"Used motor vehicle": a motor vehicle that is not a new motor
				vehicle.
"Vehicle": every device in, upon, or by which any person or
				property is or may be transported or drawn upon a highway.
"Weekday": any day that occurs during the period of time
				commencing at 10:00 p.m. Sunday and ending at 10:00 p.m. Friday during any
				particular week.
"Weekend day": any day that occurs during the period of time
				commencing at 10:00 p.m. Friday and ending at 10:00 p.m. Sunday during any
				particular week.
"Well-maintained muffler": a muffler that is free from defects
				affecting its sound reduction and visible defects, such as holes and other
				acoustical leaks.