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Home My WebLink About083-87 ('~. RESOLUTION NO. 83-87 NOISE CON'l'ROL GUIDELINES SECTION ~l. DECLARATION OF POLICY SECTION ~2. DEFINITIONS SECTION ~3. MAXIMUM PE~MISSIBLE NOISE LEVELS BY RECEIVING LAND USE SECTION ~4. NOISE ABATEMENT PROCEDURES SECTIO~l 05. MAXIMUM PERMISSIBLE DWELLING INTERIOR SOUND LEVELS SECTION 06. EXCEPT IONS: SPECIAL NOISE SOURCES SECTION ~7 . EXCE PT IONS: OTHER SECTION ~l. DECL~RATION OF POLICY The regulations con~ained in this policy are to be used as an adjunct to the Uoise Control ordinance adopted by the Town of Danville. These re3~lations are intended to provide guidelines for the implementation and enforcement of the Noise Control ordinance as required by Section 7-808. A~ evaluation of the source of noise under these guidelines is one of several factors to be considered in determiningwhether aviolation of the Municipal Code exists. It is the poli:y of the Town of Danville to encourage all residents and businessp.S to conform to the standards contained herein. SECTION "2. DEFINITIONS - The following definitions apply to these guidelines: A. A-weighted Sound Level. The sound level in deci- bels as measured on a sound level meter using the A-weighting network. The level so read is designated 1B{A) or dBA. B. Ambient Noise Level. The composite of noise from all sources near and far. In this context, the ambient level 1 constitutes the normal or existing level of environmental noise at a given location, minus the source which is the subject of enforcement. c. Decibels (dBA). A unit for measuring the ampli- tude of sound, equal to 2~ times the logarithm to the base l~ of the ratio of the pressure of the sound measured to the reference pressur~, which is 20 micropascals. D. Impulsive Sound. Sound of short duration, usual- ly less than one second, with an abrupt onset and rapid decay. Examples of sources of impulsive sound include explosions, drop forge impacts, and discharge of firearms. E. Intrusive Noise. That noise which intrudes over and above the existing ambient noise at a given location. "The relative intrusiveness of a sound depends upon its amplitude, duration, frequency and time of occurrence, c~a tonal or informa- tional content as well as the prevailing ambient noise level. F. Noise Zone. Any defined areas or regions of a generally consistent land use wherein the ambient noise levels are within a range of 5 dB. (Typically, all sites within any given noise zone will be of comparable proximity to major noise sources. ) G. Noise Level. The maximum continuous sound level or repetitive peak sound level, produced by a source or group of sources as measured with a precision sound level meter. In order to measure a noise level, the controls of the precision sound level meter should be arranged to the setting appropriate to the type of noise being measured. H. Precision Sound Level Meter. A device for 2 measuring sound level in decibel units within the performance specifications in the American National Standards Institutp. Standard S1.4, or successor reference, "Specification for Sound Level Meters." I. Property Plane. A vertical plane extending from the property line along the ground surface, which s~parates the real property owned by one person from that owned by another person, but not including intra-building real property divisions. SECTION 03. MAXIMUM PER~ISSIBLE NOISE LEVELS BY RECEIVING LAND USE. (a) The noise st:\ndards in Table 1 apply unless other- wise specifically indi~~ted. (b) t~ois~ is presumed to be excessive and to cause annoyance and disconfort to reasonable persons if the noise causes the noise level when measured on a~y other property to exceed: (1) the noise standarj for that zone for a cumulative period of more than thirty minut~s in any hour: or (2) the noise standard plus 5 dB for a cumulative period of more than fifteen minutes in any hour: or (3) The noise standard plus 10 dB for a cumulative period of more than five minutes in any hour: or (4) the noise standard plus 15 dB for a cumulative period of more than one minute in any hour: or (5) the noise standard plus 20 dB for any period of time. (c) If possible, the ambient noise level should be measured at the same location along the property line utilized in Section C(J3.(b) with the alleged offending noise source inopera- 3 tive. If the intruding noise source is continuous and cannot reasonably be discontinued or stopped for a time period whereby the ambient noise level can be measured, the ambient noise level may be determined by travelling away from the noise source to a point Where a steady stat~ decibel reading is achieved. If this test is not possible, the noise level measured while the source is in operation shall be compared directly with the noise level standards in Table 1 for the appropriate noise zone. (d) If the measured local ambient exceeds the standard in Table 1, within any of the first four noise limit categories above, the allowable noise exposure standar~ shall be increased in 5 dB increments in each category as appropriate to encompass or reflect said ambient noise level. (e) If the measurement location is on a boundary between two different zones, the sound level limi~ applicable to the quieter noise zone shall apply. (f) If the alleged offensive noisa contains a steady, audible tone such as a whine, screech, or hum, or is an impulsive noise such as hammering, or contains music or speech conveying informational content, the standard limits set forth in Table 1 shall be reduced by 5 dB. 4 TABLE 1 RECEIVING LAND USE BOISE ZOIlE ----------------------------------------------------------------------- 45 50 Single Family Residential Zone Sl Zone S2 Zone S3 Zone S4 Multi-Family Residential Zone Ml Zone M2 Schools, Libraries, Public Spaces commercial Zone Cl Zone C2 Industrial Zone 11 TIME PERIOD NOISE STANDARD (dBA) 10 pm - 7 am 7 am - 1" pm 1" pm - 7 am 7 am - 1" pm 1" pm - 7 am 7 am - 1" pm 1" pm - 7 am 7 am - 1 ~ pm 1" pm - 7 am 7 am - 1 ~ pm 1" pm - 7 am 7 am - 1 ~ pm 55 60 60 65 65 7" 6121 65 65 7121 1121 pm - 7 am 7 am - 10 pm 1121 pm - 7 am 7 am - 1121 pm 55 6121 6121 65 121 pm - 7 am 7 am - l~ pm 1" pm - 7 am 7 am - 1121 pm 65 7121 65 70 The classification of different areas of the community in terms of environmental noise zones shall be determined by the noise control officer and recorded on a map entitled Noise Zones. SECTION "4. NOISE MEASUREMENT PROCEDURES - (a) Upon receipt of a complaint from a citizen, the noise control officer will review the standards in the noise control ordinance to determine whether a violation of the noise control ordinance may have occurred. If the noise control offi- 5 cer reasonably ~elieves there is probable cause to suspect a violation of the noise control ordinance, the noise control officer may make and record sound level measurements. If sound level measurements are made, the noise control officer shall record all information pertinent to the complaint, including the following: (1) Type of noise source. (2) Location of noise source relative to com- plainant's property. (3) Tine period during which noise source is con- sidered by complainant to be intrusive. (4) Total duration of noise produced by noise source. (5) Date and time of noise measurement survey. (6) Height and location of the sound level meter microphone. (7) Other factors listed in Muni=ipal Code Section 7 -SeJ3 . meter and the "510\0/" meter response ("fast" for impulsive type (b) Using t~e "A" Weighting scale of the sound level sounds), the noise control officer shall measure the noise level at a position or positions along the complainant's property line closest to the noise source or at the location along the boundary line where the noise level is at maximum. Where possible, the microphone sha 11 be located five feet above the ground and six feet or more from the nearest reflective su~face. However, in those cases where another elevation is deemed appropriate, the latter shall be utilized. The noise control officer shall calib- rate the meter immediately before to the measurements. (c) The nois: measurement survey shall include a measure- ment of the exis~ing local ambient noise level (without the offending source), if possible, and the noise levels with the alleged offending source. SECTION 05. MAXI~ro~ PERMISSIBLE DWELLING INTERIOR SOUND LEVELS Noise is presumed to be excessive and to cause annoyance and discomfort to reasonab 1 e per sons if the no ise wi thin mul ti- fami 1 y residential property, exceeds a noise level more than 6 dB above the local ambient noise when measured three feet from any wall, floor, or cp.iling insi1e any dwelling unit on the same property when the windows a~j doors of the dwelling unit are in their normal seasonal configur~tion. Interior noise levels are not established for single family areas as it is presumed that the outdoor ambient levels will protect residents that are inside a structure on the singt"e---'-- family property. SECTION 06. EXCE?~IONS: SPECIAL NOISE SOURCES. Notwithstanding the general provisions of these regulations cer- tain sources of noise may exceed the noise standards for a noise zone provided they do not exceed the maximum noise level speci- fied in Table 2. Noise level shall be determined by measuring at the property plane, unless otherwise specified. 7 TABLE 2 SOURCE TIME PERIODS MAXIMUM DECIBEL LEVEL (dBA) --------------------------------------------------------------------------- 82 Leaf Blowers Residential Maintenance power Tools (e.g- lawn mowers, edgers, tr~ers, power saws, chain saws, ~tc- commercial Maintenance power Tools (e.g- lawn mowers, edgers, trimmers, sweepers, blowers, etc.) construction/demolition, authorized by a valid Town Permit, measured at 25 feet of the equipment or activity Monday - Saturday 7:~0 am - 1~:00 pm Sunday 10:~0 am - 8:00 pm all other times t-ionday - Friday 8:00 am - l0:~~ pm Sa turday 9:00 am - 1~:00 pm Sunday 10:00 am - 10:00 pm all other times Monday - Friday 6:0~ am - l~:~~ pm Saturday 7:0~ am - l~:~~ pm Sunday 9:00 am - 1~:0~ pm all other times "Monday - Fr iday 7:~~ am - 7:0~ pm Saturdays, Sundays, Holidays 9:0~ am - 7:~~ pm all other timf!s Air Conditioning and Air handlin~ equipment. Installed prior to l-1-8~ Anytime Installed after l-1-8~ Anytime Swimming Pool and Spa equipment 8:~0 pm - 8:0~ am all other times 82 . prohibi ted 82 82 82 prohibited 82 82 8'2 prohibited 83 83 prohibited 6~ 55 45 (standard fa noise zone SECTION 07. EXCEPTIONS: OTHER (a) These regulations are guide1 ines to be used in con- junction with Municipal Code Sections 7-801 through 7-808(Noise Control Ordinance). The ordinance provides for the granting of exceptions to the ordinance, and implicit in this is the granting of exceptions to the criteria contained in these guidelines. (b) Existing commercial sweeping and maintenance operations exist which may be considered for exceptions as to hours of operation or other special conditions. (c) Any permit relating to hours of operation that are existing prior to preparation of these guidelines is considered val id . 9 I :' ~ . 1" . .-. 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