171 Commerce Street PO Box 1486 Williston, VT 05495 Telephone 802-862-1980 Fax 737-207-8272 www.atcgroupservices.com Mr. John Stewart South Burlington School District 500 Dorset St. South Burlington, VT 05403 Transmitted via email to: jstewart@sbschools.net Subject: Baseline Noise Survey Chamberlin Elementary School 262 White St. South Burlington, Vermont ATC Project Number: 280EM00088 Dear John: South Burlington School District (SBSD) authorized ATC Group Services, LLC (ATC) to perform a Baseline Noise Survey at the Chamberlin School facility located at 262 White St. in South Burlington, Vermont. This Survey was conducted in general conformance to ATC s Chamberlin School Noise Monitoring Plan, dated November 9, 2017. The attached report presents the results of the observations and monitoring performed on April 10, 11, and 19, 2018 by Devin Porter of ATC. Thank you for selecting ATC for your environmental management needs. If you have any questions, please do not hesitate to call us at (802) 862-1980. Sincerely, ATC Group Services LLC Devin Porter Staff Scientist Direct Line +1 802 862 1980 Email: rob.montgomery@atcgs.com Robert Montgomery Senior Project Manger Direct Line +1 802 862 1980 Email: rob.montgomery@atcgs.com S:\Projects - BST\R-T\So Burlington School District\280EM00088 Chamberlin Noise Monitoring\280EM00088 Chamberlin Noise Report - FINAL.docx
171 Commerce Street PO Box 1486 Williston, VT 05495 Telephone 802-862-1980 Fax 737-207-8272 www.atcgroupservices.com BASELINE NOISE SURVEY REPORT Chamberlin School 262 White St. South Burlington, Vermont ATC Project Number: 280EM00088 PREPARED FOR: John Stewart Special Projects South Burlington School District 500 Dorset St. South Burlington, Vermont, 05403 May 2018
Page 1 Table of Contents 1.0 Background... 2 1.1 Facility... 2 1.2 Qualifications... 2 2.0 Methodology... 2 2.1 Ambient Monitoring... 2 2.2 Personal Monitoring... 3 3.0 Results and Discussion... 4 3.1 Ambient Results... 4 3.1.1 Day-Night Level... 4 3.1.2 School Day (8-hour) Monitoring... 5 3.1.3 Activity Interference... 5 3.2 Personal Exposure Results... 6 4.0 Findings and Conclusions... 8 5.0 Limitations... 9 Appendices Appendix A: Glossary of Terms and Acronyms Appendix B: Sample Location Diagram Appendix C: Dosimeter Reports Appendix D: Sound Level Meter Reports Appendix E: Equipment Calibration Records Appendix F: Weather Records
Page 2 1.0 Background 1.1 Facility Chamberlin School is located at 262 White St. in South Burlington, Vermont and provides Pre- Kindergarten 5 th grade learning services. ATC Group Services, LLC (ATC) understands that previous baseline noise measurements were collected at six (6) former residential properties owned by the Burlington International Airport (BTV) in 2012 and reported in the Study of Noise Level Reduction (NLR) Variation Report dated April 2013 and that noise modeling data was presented by the United States Air Force F-35A Operational Basing Final Environmental Impact Statement (FEIS) in September 2013. This Survey is intended to provide the SBSD with a baseline noise survey of current conditions both inside and outside of the Chamberlin School. Current conditions include existing F-16 and other aircraft operations conducted at the Burlington International Airport (BTV). Please see Appendix A for a glossary of relevant terms and acronyms. 1.2 Qualifications ATC has provided environmental and industrial hygiene consulting services in Vermont since 1988 and has demonstrated extensive experience performing noise monitoring for commercial, industrial, educational, and governmental clients. ATC has over 70 offices nationwide and is a leading provider of environmental, industrial hygiene, geotechnical, and construction materials testing services. The ATC office in Williston, VT employs ten technical staff including environmental professionals, environmental scientists, and field staff certified in various building science and industrial hygiene fields. ATC staff assigned to this project include Thomas Broido, Robert Montgomery and Devin Porter. Mr. Broido, project Principal has over 30 years of interdisciplinary experience in the environmental consulting and industrial hygiene fields. For over 16 years Mr. Montgomery has completed studies similar to this in educational, commercial, industrial, and healthcare settings. For over 10 years, Mr. Porter has completed studies similar to this in educational, industrial, commercial and construction settings. 2.0 Methodology 2.1 Ambient Monitoring Ambient environmental noise data was collected at three locations on the property of Chamberlin School. Data was collected on three dates: April 10, 11, and 19, 2018, with the goal of measuring noise levels during the Day (approximately 7:00 AM 10:00 PM), the School Day (approximately 8:00 AM 4:00 PM), and the Night (approximately 10:00 PM 7:00 AM). ATC collected data using Casella CEL-633C Sound Level Meters. The meters were placed on stands approximately 4 to 6 feet above the ground or floor. They were programmed to record environmental noise levels continuously throughout the day, school day, and night, using the A-weighting scale. Data was downloaded at approximately 10:00 PM and 7:00 AM following each sampling event. All meters were calibrated prior to data collection, using Casella CEL-120/1 Acoustic Calibrators. All meters were maintained within manufacturer s recommended operating temperatures during the sampling events.
Page 3 Sampling locations were chosen in consultation with Chamberlin School and SBSD personnel to represent: exterior areas, indoor classrooms (with the windows open), and indoor classrooms (with the windows closed). Data was collected at the following locations: Exterior (Meter #2145340): on the school playground, near a swing set. The meter was located approximately 154 feet from the Room 20/21 Project Room exterior corner, and approximately 204 feet from the Room 8/9 Project Closet exterior corner. Room 19 (Meter #2145334): 4 feet from the exterior wall, 5 feet from the exterior door. Day and School Day data was collected with the exterior windows open. Night data was collected with windows closed, for security purposes. Room 13 (Meter #4637969): 4.5 feet from the exterior wall, near a half-height bookshelf. All data was collected with windows closed. A sample location diagram is included as Appendix B. Sound level meter profile reports are included as Appendix D. Equipment calibration records are included as Appendix E. ATC set up the sampling equipment each day prior to 7:00 AM, and remained on-site until after 4:00 PM. While on-site, ATC monitored the equipment to ensure continued data collection. ATC also observed noise sources and patterns, and monitored aircraft activity in the vicinity of the school and airport. Weather on each day was general cool and overcast, with winds varying from calm to moderate. Occasional precipitation (rain and snow) was observed. For weather records, see Appendix F. 2.2 Personal Monitoring Personal noise exposure monitoring was conducted by ATC for a total of five (5) employees of Chamberlin School over the period April 10, 11, and 19, 2018. ATC collected data during relevant portions of each employee s workday, between approximately 8:00 AM and 4:00 PM each day. ATC utilized Casella dbadge2 digital noise dosimeters to collect personal exposure data. These dosimeters integrate into the sound exposure measurement all continuous, intermittent, and impulsive sound levels from 65 to 140 db, utilizing the slow response mode, a 5 decibel (db) exchange rate, and the A weighting scale, in accordance with the Vermont Occupational Safety and Health Administration s (VOSHA s) criteria for evaluating noise exposures (thresholds of 80 dba and 90 dba). The dosimeters were calibrated prior to sampling using a Casella model CEL-120/2 acoustic calibrator at 114 db-1000 Hertz. Microphones used to detect the sound levels during the monitoring period were clipped on participants clothing near their ear to measure the sound levels at the employees ear. Dosimeter data reports are included as Appendix C. Personnel to be monitored were selected by SBSD and Chamberlin School, to represent the following positions (names have been removed to maintain employee privacy): Teacher (in a room with open windows, Room 19): Employee A Teacher (in a room with closed windows, Room 13): Employee B, Employee E Recess Monitor/School s Out Attendant (Playground/Cafeteria): Employee C, Employee D
Page 4 3.0 Results and Discussion 3.1 Ambient Results The following sections detail the results of the various ambient noise monitoring activities on April 10, 11, and 19, 2018. Each section includes discussion of a selected parameter and standard of comparison: Day-Night Level, School Day (8-hour) Monitoring, and Activity Interference analysis. 3.1.1 Day-Night Level The A-weighted equivalent continuous sound pressure level (LA eq) and the A-weighted maximum sound pressure level with fast time constant (LAF max) were recorded at each selected location during each sampling event. ATC calculated the Day Night Level (L dn, or DNL) for each location during each 24- hour period using the following equation: LL dddd = 10 log 1 24 15 10 LL dd 10 + 9 10 LL nn+10 10 Where L dn is the Day Night Level, L d is the daytime equivalent sound level, and L n is the nighttime equivalent sound level. The following Table 1 presents the results of ambient environmental noise monitoring: Table 1: Results of Environmental Noise Monitoring April 10, 11, and 19, 2018 Location Date Time Slot LA eq (dba) LAF max (dba) L dn (dba) Exterior Day (L d) 63.2 106.9 April 10 Night (L n) 48.5 79.4 April 11 Day (L d) 62.8 105.6 Night (L n) 43.6 75.8 April 19 Day (L d) 63.7 111 Night (L n) 45.3 75.6 Room 19 Day (L d) 59.9 101.2 April 10 (windows open) Night (L n) 49.5 63.5 April 11 Day (L d) 63.8 98.5 Night (L n) 46.4 61.3 April 19 Day (L d) 65.4 107.2 Night (L n) 46.3 65.7 Room 13 Day (L d) 56.8 91.8 April 10 (windows closed) Night (L n) 41.5 62.4 April 11 Day (L d) 56.4 86.8 Night (L n) 43.2 80.3 April 19 Day (L d) 59.5 95 Night (L n) 45.1 74.8 The 2013 FEIS (Figure BR3.2-1) depicts the Chamberlin School within the 70-74 db DNL (Day-Night Average Sound Level) contour during existing F-16 operations and further reports a baseline DNL of 70 62.0 61.1 62.0 59.8 62.2 63.7 55.5 55.5 58.3
Page 5 dba for Chamberlin School. The maximum calculated DNL (L dn) during ATC s sampling events was 63.7 dba. All DNL sampling results are below the FEIS baseline DNL value of 70 dba. The 1992 Federal Interagency Committee on Noise (FICON) Report (Table 3.1) identifies an equivalent DNL (L dn) of 45 db to protect the public health and welfare from activity interference and hearing loss effects with an adequate margin of safety in an indoor educational facility. The 1992 FICON report also identifies an equivalent DNL of 55 db to provide the same protection outdoors at an educational facility. All DNL sampling results exceeded both the indoor and outdoor FICON thresholds. 3.1.2 School Day (8-hour) Monitoring The following Table 2 includes the A-weighted equivalent continuous sound pressure level (L eq8) and the A-weighted maximum sound pressure level with fast time constant (LAF max) for each location during each sampling event, when measured during the hours 8:00 AM to 4:00 PM: Table 2: Results of School Day Noise Monitoring April 10, 11, and 19, 2018 Location Date L eq8 (dba) LAF max (dba) Exterior April 10 65.8 106.9 April 11 65.3 105.6 April 19 66.3 111 Room 19 (windows open) Room 13 (windows closed) April 10 62.4 101.2 April 11 66.3 98.5 April 19 68 107.2 April 10 59.3 91.8 April 11 57.6 86.8 April 19 62.1 95 The FEIS reports a background outdoor equivalent noise level (FEIS terminology: LA eq; ATC terminology: L eq8) of 74 dba during existing F-16 operations between 8:00 AM and 4:00 PM. The highest measured L eq8 (either indoor or outdoor) during this interval was 68.0 dba. All LA eq sampling results were below the FEIS background value of 74 dba. 3.1.3 Activity Interference ATC manually reviewed the L max data from April 10, 11, and 19, 2018 and identified noise events during which the L max exceeded 65 dba and 75 dba. For interior classrooms, ATC attempted to conduct the same analysis for L max events exceeding 50 dba. However, any additional interior L max events which fall between 50 and 65 dba cannot be identified from the data, likely due to interference from general school and/or neighborhood noise. Identified noise events have been correlated with ATC s observations of aircraft traffic in the vicinity of Chamberlin School during the sampling events. The following Table 3 displays the total number of exterior exceedances which coincided with observed air traffic on each day. These results should be considered estimates only, as ATC s observer was not able to monitor all air traffic at all times throughout the sampling events.
Page 6 Table 3: Results of School Day Noise Monitoring April 10, 11, and 19, 2018 Location Date NA65L max NA75L max Exterior April 10 25 22 April 11 26 29 April 19 21 37 The 2013 FEIS (Table BR3.2-5) presents baseline classroom speech interferences for Chamberlin School. Per the FEIS, between 8:00 AM and 4:00 PM, Chamberlin School experiences 5 speech interference events with windows closed and 25 speech interference events with windows open over an 8-hour period. A speech interference event is defined as an exterior noise that registers at greater than 50 dba in the classroom. Use of NA75L max to quantify speech interference assumes a noise level reduction of 25 dba (windows closed). Use of NA65L max to quantify speech interference assumes a noise level reduction of 15 dba (windows open). For Room 19 (with the windows open, and assuming a 15 dba reduction), the NA65L max values ranged from 21 to 26 events. For Room 13 (with the windows closed, and assuming a 25 dba reduction), the NA75L max values ranged from 22 to 37 events. ATC data indicates more total speech interference events than the FEIS reports. However, not all of these are solely attributable to aircraft noise. Coincidence of school or community noise with aircraft activity may have elevated the number of counted events. 3.2 Personal Exposure Results The Vermont Occupational Safety and Health Administration (VOSHA) has established a Permissible Exposure Limit (PEL) for noise (29 CFR 1910.95) of 90 decibels on the A weighting scale (dba) or 100% dose for an eight-hour workday. This value assumes a threshold of 90 decibels and doubling rate of 5 decibels for the dosimetry results. The VOSHA standard also stipulates an Action Level (AL) of 85 dba or 50% dose for the same period. This value assumes a threshold of 80 decibels and a doubling rate of 5 decibels. PELs are time-weighted average (TWA) exposures that must not be exceeded in any 8-hour work shift. The PEL is a mandated regulatory exposure limit. Name: Employee A Position: Teacher, Room 19 Instrument Serial #: 2661839 Data Reporting Parameter Unit of Measure Result April 10 Result April 11 Result April 19 VOSHA PEL VOSHA AL TWA, 90 dba Threshold dba 25.5 30.0 39.0 90 N/A TWA, 90 dba Threshold (Actual Dose) % 0.0 0.0 0.1 100 N/A TWA, 90 dba Threshold (8hr. Projected Dose) % 0.0 0.0 0.1 100 N/A TWA, 80 dba Threshold dba 44.2 55.3 53.0 N/A 85 TWA, 80 dba Threshold (Actual Dose) % 0.2 0.8 0.6 N/A 50 TWA, 80 dba Threshold (8hr. Projected Dose) % 0.2 0.8 0.6 N/A 50
Page 7 Name: Employee B Position: Teacher, Room 13 Instrument ID: 1167212 Data Reporting Parameter Unit of Measure Result April 10 Result April 11 VOSHA PEL VOSHA AL TWA, 90 dba Threshold dba 56.3 50.4 90 N/A TWA, 90 dba Threshold (Actual Dose) % 0.9 0.4 100 N/A TWA, 90 dba Threshold (8hr. Projected Dose) % 2.3 1.0 100 N/A TWA, 80 dba Threshold dba 66.2 60.9 N/A 85 TWA, 80 dba Threshold (Actual Dose) % 3.7 1.8 N/A 50 TWA, 80 dba Threshold (8hr. Projected Dose) % 9.0 4.5 N/A 50 Name: Employee C Position: Recess Monitor/School s Out Attendant Instrument ID: 1167212 Unit of Data Reporting Parameter Measure Result April 10 Result April 11 VOSHA PEL VOSHA AL TWA, 90 dba Threshold dba 65.2 65.5 90 N/A TWA, 90 dba Threshold (Actual Dose) % 3.2 3.3 100 N/A TWA, 90 dba Threshold (8hr. Projected Dose) % 5.7 6.2 100 N/A TWA, 80 dba Threshold dba 70.7 70.9 N/A 85 TWA, 80 dba Threshold (Actual Dose) % 6.9 7.1 N/A 50 TWA, 80 dba Threshold (8hr. Projected Dose) % 12.1 13.3 N/A 50
Page 8 Name: Employee D Position: Recess Monitor/School s Out Attendant Instrument ID: 1167212 Data Reporting Parameter Unit of Measure Result April 19 VOSHA PEL VOSHA AL TWA, 90 dba Threshold dba 68.3 90 N/A TWA, 90 dba Threshold (Actual Dose) % 4.9 100 N/A TWA, 90 dba Threshold (8hr. Projected Dose) % 9.4 100 N/A TWA, 80 dba Threshold dba 72.7 N/A 85 TWA, 80 dba Threshold (Actual Dose) % 9.0 N/A 50 TWA, 80 dba Threshold (8hr. Projected Dose) % 17.4 N/A 50 Name: Employee E Position: Teacher, Room 13 Instrument ID: 1167212 Data Reporting Parameter Unit of Measure Result April 19 VOSHA PEL VOSHA AL TWA, 90 dba Threshold dba 38.5 90 N/A TWA, 90 dba Threshold (Actual Dose) % 0.1 100 N/A TWA, 90 dba Threshold (8hr. Projected Dose) % 0.2 100 N/A TWA, 80 dba Threshold dba 58.0 N/A 85 TWA, 80 dba Threshold (Actual Dose) % 1.2 N/A 50 TWA, 80 dba Threshold (8hr. Projected Dose) % 3.1 N/A 50 ATC understands the length of work-shifts at the facility may vary. Additional adjustments to the regulated TWA and Dose % can be made (not a regulatory requirement) utilizing Table G 16-A in Appendix A of CFR 1910.95 (OSHA Hearing Conservation). All noise monitoring results reported herein were below the VOSHA PEL of 90 dba and the VOSHA AL of 85 dba for an 8-hour TWA utilizing dosimeter thresholds of 90 dba and 80 dba, respectively, as outlined in 29 CFR 1910.95. Furthermore, all doses projected to an 8-hour workday were below both the PEL and AL. 4.0 Findings and Conclusions Based on the ambient and personal noise monitoring results and observations, ATC concludes: Calculated DNLs for all locations during all sampling events were below the 70 dba baseline level presented in the FEIS (Figure BR3.2-1).
Page 9 Calculated DNLs for all locations during all sampling events exceeded both the indoor (45 db) and outdoor (55 db) FICON thresholds. Measured 8-hour equivalent noise levels (L 8eq) for all locations during all sampling events were below the 74 dba baseline level presented in the FEIS (Figure BR3.2-5) Observed aircraft noise events in excess of 75 dba were higher than the baseline level presented in the FEIS. Observed aircraft noise events in excess of 65 dba were similar to the baseline level presented in the FEIS. Measured employee noise exposures were below the applicable (mandatory) VOSHA Permissible Exposure Limit and Action Level. 5.0 Limitations ATC provided these services consistent with the level and skill ordinarily exercised by members of the profession currently providing similar services under similar circumstances at the time the services were provided. This statement is in lieu of other statements either expressed or implied. This report is intended for the sole use of the client. The scope of services performed in execution of this evaluation may not be appropriate to satisfy the needs of other users, and use or re-use of this document, the findings, conclusions, or recommendations is at the risk of said user. As with all such assessments, the results of the sampling represent conditions found on the date of the survey and may not represent conditions found at other times. Additionally, this assessment was limited with respect to the specific parameters indicated above and should not be construed to be a comprehensive evaluation or a definitive representation of conditions within the facility. The information presented in this report is intended to be used as a guide to evaluate the need for further investigation or the need for modifications to the processes or procedures surveyed. The client recognizes and agrees that all testing and remediation methods have reliability limitations, no method nor number of sampling locations can guarantee that a condition will be discovered within the performance of the services as authorized by the client. Additionally, the passage of time may result in a change in the environmental characteristics at this site. This report does not warrant against future operations or conditions that could affect the recommendations made. The results, findings, conclusions, and recommendations expressed in this report are based only on conditions that were observed during ATC s inspection of the site.
Page 10 Appendix A Glossary of Terms and Acronyms
Page 11 Glossary of Terms and Acronyms AL: Action Level The VOSHA Noise standard (29 CFR 1910.95) requires employers to have a hearing conservation program in place if workers are exposed to a time-weighted average (TWA) Action Level of 85 decibels (dba) or higher over an 8-hour work shift. ATC: ATC Group Services, LLC is a US nationwide environmental consulting firm, with broad experience conducting noise assessment and evaluation. BTV: Burlington International Airport is a joint-use civil-military airport in Chittenden County, Vermont, United States. It is owned by the City of Burlington and located in South Burlington, approximately half a mile from the site of Chamberlin School. db: Decibel a relative unit of measurement widely used in acoustics, electronics and communications. The db is a logarithmic unit used to describe a ratio between the measured level and a reference or threshold level of 0dB. The ratio may be sound power, sound pressure, voltage or sound intensity. Since the decibel is a logarithmic unit, an increase of 3 db corresponds to a doubling of sound energy. However, for most people, an increase of 10 db corresponds to a doubling of perceived sound intensity. dba: Decibels, A-weighted A-weighting is applied to instrument-measured sound levels in an effort to account for the relative loudness perceived by the human ear, as the ear is less sensitive to low audio frequencies. It is employed by arithmetically adding a table of values, listed by octave or third-octave bands, to the measured sound pressure levels in db. The resulting octave band measurements are usually added (logarithmic method) to provide a single A-weighted value describing the sound. DNL: The day-night average sound level (Ldn or DNL) is the average noise level over a 24-hour period. The noise between the hours of 10pm and 7am is mathematically increased by 10 db. This noise is weighted to take into account the decrease in community background noise of 10 db during this period. Dose Percent (%): The amount of noise (collected using a noise dosimeter worn by a worker) expressed as a percentage of the VOSHA PEL or AL. Since the VOSHA standard utilizes a 5 db exchange rate, a TWA exposure of 95 dba is equivalent to a dose of 200 percent, while a TWA exposure of 85 dba is equivalent to a dose of 50 percent. F-16: The General Dynamics F-16 Fighting Falcon is a single-engine supersonic multirole fighter aircraft originally developed by General Dynamics (now Lockheed Martin) for the United States Air Force. The Vermont Air National Guard (158th Fighter Wing) operates F-16 aircraft from their base facility colocated with BTV. F-35A: The Lockheed Martin F-35 Lightning II is a family of single-seat, single-engine, all-weather stealth multirole fighters. The fifth-generation combat aircraft is designed to perform ground attack and air superiority missions. The Vermont Air National Guard (158th Fighter Wing) has been selected by the United States Air Force to receive F-35As as replacement for the current F-16 aircraft. FEIS: Final Environmental Impact Statement. The United States Air Force F-35A Operational Basing Final Environmental Impact Statement dated September 2013. This document discusses environmental concerns (including noise issues) related to the basing of F-35 aircraft at several potential sites, including BTV. FICON: the Federal Interagency Committee on Noise - In 1991, the FAA and EPA initiated the Federal Interagency Committee on Noise (FICON) to review technical and policy issues related to assessment of
Page 12 noise impacts around airports. Membership included representatives from DOD, DOT, HUD, the Department of Justice, VA, and the Council on Environmental Quality. The FICON review focused, among other things, on the manner in which noise impacts are determined and described and the extent of impacts that should be reviewed in a NEPA document. The FICON's findings and recommendations were published in an August 1992 report, Federal Agency Review of Selected Airport Noise Analysis Issues. LA eq: the A-weighted Equivalent Continuous Sound Level. When a noise varies over time, the LA eq is the equivalent continuous A-weighted sound which would contain the same sound energy as the time varying sound. Calculated for the duration of the measurement. LA eq8: the A-weighted Equivalent Continuous Sound Level (LA eq), calculated for the period 8:00 AM to 4:00 PM. LAF max: the A-weighted Maximum Sound Level recorded during a 1/8 second (125 ms) interval (fast response). L d: LA eq recorded for the period 7:00 AM to 10:00 PM. L dn: See DNL L n: LA eq recorded for the period 10:00 PM to 7:00 AM. NA65L max: the number of aircraft-correlated events resulting in an exterior LAF max value greater than 65 dba. NA75L max: the number of aircraft-correlated events resulting in an exterior LAF max value greater than 75 dba. PEL: the VOSHA Permissible Exposure Limit for noise. Expressed as an 8-hour time-weighted average. SBSD: South Burlington School District TWA: Time-Weighted Average A TWA is the average exposure over a specified period, usually a nominal eight hours. This means that, for limited periods, a worker may be exposed to concentration excursions higher than the PEL, so long as the TWA is not exceeded and any applicable excursion limit is not exceeded. VOSHA: The Vermont Occupational Safety and Health Administration The division of the Vermont Department of Labor responsible for protecting the health and safety of workers in Vermont. It is delegated to enforce Vermont and federal workplace safety regulations.
Page 13 Appendix B Sample Location Diagram
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