Local Ordinance Targeted to Low-Frequency Noise

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1 Local Ordinance Targeted to Low-Frequency Noise Bennett M. Brooks, PE Brooks Acoustics Corporation 27 Hartford Turnpike, Vernon, CT USA Paper 4pNSa1 - Presented at the 138th Meeting of the Acoustical Society of America Columbus, Ohio 4 November 1999

2 LOW-FREQUENCY NOISE Major cause of residential disturbance What sources cause low-frequency noise? How does it affect the residential environment? What will be the official response?

3 LOW-FREQUENCY NOISE SOURCES Some Examples: - Industrial uses - Power industry (engine) installations - Manufacturing - Commercial uses - Mechanical (HVAC/refrig) systems - Entertainment (musical) sources

4 LOW-FREQUENCY NOISE EFFECTS ON RESIDENCES: - Intermittent disturbance of residents - Continuous disturbance of residents - Noise induced vibration of housing structure

5 OFFICIAL RESPONSE TO LOW-FREQUENCY NOISE VARIES: - No response - Attempt to regulate using overall level limits A-weighted level C-weighted level - Band level limits

6 CASE STUDY - BAND LEVEL LIMITS - Town authorities requested help - Determined a need to regulate low-frequency noise - Complaints from residential community near sports bar - offers musical entertainment - Desire to develop universally applicable (nonspecific) objective regulation

7 BAC asked to develop noise limit criteria - Must address low-frequency noise - Must be objective - Must be easily enforced (procedures) - Must be approved by State DEP - Metrics studied: A-weighted level (dba) Octave band levels One-third octave band levels

8 Selection of band limit levels Consider state mandated A-weighted limits - State limits depend upon: - Land use - Day or night hours - Select octave band limits such that: Summed band level limits equal A-weighted limits

9 Selection of band limit levels Existing State of Connecticut and Local A- weighted Overall Level Limits Emitter Receiver Day Night Industrial Residential Commercial Residential 55 45

10 Selection of band limit levels Consider noise emitter sources which contain excessive low-frequency content - Hypothetical case 1 - Emitter exceeds A-weighted level limits - Hypothetical case 2 - Emitter meets A-weighted level limits

11 B.M. Brooks - Local ordinance targeted to low-frequency noise Paper 4pNSa1-138th ASA Meeting, Columbus, Ohio, Nov Octave Band Noise Level Limits Industrial and Commercial Emitters 70 Octave Band SPL (re: 20 µpa) Industrial Daytime OB Level Limits 61 dba Commercial Daytime OB Level Limits 55 dba Industrial Nighttime OB Level Limits 51 dba Commercial Nighttime OB Level Limits 45 dba Octave Band Center Frequency (Hz)

12 90 80 Octave Band Noise Level Limits Commercial Emitter to Residential Receiver Comparison with Hypothetical Low-frequency Noise Emitters 70 Octave Band SPL (re: 20 µpa) Daytime OB Level Limits, 55 dba Nighttime OB Level Limits, 45 dba Hypothetical Emitter 1, 44.2 dba Hypothetical Emitter 2, 44.2 dba Octave Band Center Frequency (Hz) B.M. Brooks - Local ordinance targeted to low-frequency noise Paper 4pNSa1-138th ASA Meeting, Columbus, Ohio, Nov. 1999

13 Octave band limit study technical results - Octave band limits apply objective criteria to varied low-frequency problems - Hypothetical emitter Could be in compliance with A-weighted overall noise limits Could at same time be in violation of octave band noise limits

14 CONCLUSIONS Octave band noise limits - Implementation - Octave band noise limits integrated into existing Town noise ordinance and adopted by Board of Selectman - Revised Town noise ordinance approved by State DEP and enacted into law - Police Department purchased RTA and received training for 5 Officers - Addressed one incident - Prepared for more

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