NOISE IMPACT STUDY Benton Boarding and Daycare 5673 Fourth Line Road Ottawa, Ontario City of Ottawa File No. D07-12-13-0024 Page 2 of 23
TABLE OF CONTENTS 1.0 INTRODUCTION / BACKGROUND INFORMATION...6 1.1 REFERENCES... 6 1.2 PURPOSE... 7 2.0 CITY OF OTTAWA ZONING BYLAW REQUIREMENTS...8 2.1 SOUND LEVEL CRITERIA...8 2.1.1 Indoor Noise...8 2.1.2 Outdoor Noise...8 2.2 PREDICTION OF NOISE ATTENUATION LEVELS...9 2.2.1 Target Noise Attenuation...9 2.2.2 Actual Noise Attenuation and Required Barrier Heights...9 2.2.3 Barrier Construction Details...9 3.0 CITY OF OTTAWA NOISE BYLAW REQUIREMENTS...11 3.1 SOUND LEVEL CRITERIA...11 3.2 ALLOWABLE UNIT SOUND POWER LEVEL...11 4.0 SUMMARY & CONCLUSIONS...12 APPENDIX A : SITE PLANS...14 APPENDIX B : DETAILED NOISE ATTENUATION CALCULATIONS...17 Page 3 of 23
LIST OF TABLES Table 1: Worst-Case Noise Attenuation for each Outdoor Area...9 Table B.1: Barrier Shielding Factor Values...17 Table B.2: Detailed Calculation Results...19 Page 4 of 23
EXECUTIVE SUMMARY Benton Boarding and Daycare is a proposed dog kennel facility, to be located in North Gower (Ottawa), Ontario. The location and surroundings of the new kennel are such that dog runs will be located less than 215 metres from nearby dwellings. As such, noise control measures are required in order to ensure that nearby residents are not unduly disturbed by noise emanating from the new kennel. This report describes a solution that will satisfy a City of Ottawa Bylaw requirement to mitigate noise levels the installation of barriers around outdoor areas of the pet daycare facility. The methodology and calculations used to determine barrier geometry and specifications are included. This report also specifies a maximum HVAC equipment noise level per the City of Ottawa Noise Bylaw. The results indicate that the noise emissions for the site will comply with City of Ottawa Bylaw requirements with the proposed solution implemented. Page 5 of 23
1.0 INTRODUCTION / BACKGROUND INFORMATION The development of a new Dog Kennel, to be located on the property identified as 5673 Fourth Line Road in Ottawa, is being proposed. The project, which will include 100 or more dog runs as well as feline boarding areas for 20 or more cats, is currently at Site Plan Approval stage. The property at 5673 Fourth Line Road is currently being used for farming operations, with the proposed Dog Kennel to be located on an unused portion of the property. The current farming operations will continue in conjunction with the proposed Kennel. In accordance with the City of Ottawa Zoning Bylaw, the impact of operating the proposed facility is assessed for noise-sensitive receptors close to the site. Noise barrier specifications are described herein that will ensure that the new facility's emissions are compliant with this Bylaw. The new kennel will also include one exterior HVAC unit. This report specifies source noise levels for the unit that comply City of Ottawa Noise Bylaw requirements. 1.1 REFERENCES This study is based on information presented in the following drawings: Site Plan and Erosion Control Plan, Revision 1 dated 28 March 2013 and prepared by Kollaard Associates Engineers; A hand sketch provided by email from Mr. Joe Gibson on 26 June 2013, with file name KS10001.jpg Reference is also made to the following correspondence and documents: 1) City of Ottawa Zoning Bylaw Part 3, Section 84 Kennels. Available at the following url: http://ottawa.ca/en/residents/lawslicenses-and-permits/laws/city-ottawa-zoning-law/zoning-law2008-250-consolidation-30 2) City of Ottawa Noise Bylaw No.2004-253. Available at the following url: http://ottawa.ca/en/residents/laws-licenses-andpermits/laws/noise-law-law-no-2004-253 3) Benton Boarding and Daycare Overview for Site Plan Control (undated) Page 6 of 23
4) City of Ottawa Memo prepared by Laurel McCreight, dated 12 April 2013 5) Response to City of Ottawa Memo, prepared by Joe Gibson (undated) 6) Second City of Ottawa Memo prepared by Laurel McCreight, dated 22 March 2013 7) American National Standards Institute / Air-Conditioning, Heating, and Refrigeration Institute Standard 275-2010 In this report: Unless otherwise indicated, noise levels are reported in terms of a sound pressure levels ( SPL ) in decibels, referenced to 2x10-5 pascals. SWL is used to indicate a sound power level in decibels with reference level 10-12 watts. 1.2 PURPOSE The purpose of this report is to demonstrate that this project can be developed in a manner that conforms to Section 84 of the City of Ottawa Zoning Bylaw, as well as the City of Ottawa Noise Bylaw. Page 7 of 23
2.0 CITY OF OTTAWA ZONING BYLAW REQUIREMENTS 2.1 SOUND LEVEL CRITERIA The new Kennel will be located approximately 160 m from the nearest residential building located on a different property. Per Section 84 of the City of Ottawa Zoning Bylaw, the minimum separation distance for a Kennel with more than four dog runs is 215 m, or 50 m if it can be demonstrated to the satisfaction of the City that the facility will include features to attenuate all Kennel-related noise so as not to become a nuisance to surrounding dwellings. 2.1.1 Indoor Noise Noise generated from within the kennel building will be significantly attenuated by the building envelope. Air conditioning will be provided in all areas with continuous 100% fresh air circulation, therefore allowing windows to remain closed. The office is located on the South-West end of the building closest to nearby residences this arrangement provides a buffer between the indoor portion of the kennel and the outdoors, and will mitigate the potential for indoor kennel noise to be audible for brief moments when the door to the building is opened. It is thus concluded that noise generated from within the kennel building will be insignificant at all nearby residential buildings. 2.1.2 Outdoor Noise The kennel will feature four outdoor areas, including dog runs and play areas. These will be mitigated for sound with the installation of noise barriers. The proposed barriers will be designed so that the total attenuation (due to the actual available separation distance, plus noise barrier) is equal to or greater than the attenuation that what would be achieved with a 215 m separation distance alone. This will ensure that noise levels at residential buildings are no greater than what would be achieved with a 215 metre separation distance, thereby complying with Section 84 of the Zoning Bylaw. Outdoor noise levels will also be managed by limiting outdoor play time to the daytime only (07:00 to 19:00). Page 8 of 23
2.2 PREDICTION OF NOISE ATTENUATION LEVELS ANSI/AHRI Standard 275-2010 has been used to determine noise attenuation levels due to distance and barrier shielding of the outdoor areas of the proposed kennel. 2.2.1 Target Noise Attenuation As discussed above, the target attenuation for the dog kennel's outdoor runs was set as the attenuation achieved at a 215 m distance between source and receiver. Following ANSI/AHRI Standard 275-2010, this corresponds to 54.6 db of noise attenuation (see Appendix B). Greater levels of noise attenuation will result in noise levels quieter than would be achieved by the 215 m separation distance required in the City of Ottawa Zoning Bylaw. 2.2.2 Actual Noise Attenuation and Required Barrier Heights The table below summarizes the minimum required barrier heights, as well as the actual attenuation that will be achieved for the worst-case receptor for each enclosure. Each barrier is identified on the Site Plans in Appendix A. Details on the calculations and methodology are included as Appendix B. Table 1: Worst-Case Noise Attenuation for each Outdoor Area Barrier Minimum Barrier Height Worst-Case Noise Attenuation Target Noise Attenuation A 3.7 m 57.3 db 54.6 db B 3.6 m 58.0 db 54.6 db C 2.8 m 58.2 db 54.6 db D 2.1 m 58.5 db 54.6 db Note that the attenuation levels above will increase with any increase in the barrier height. 2.2.3 Barrier Construction Details Each noise barrier must be constructed of a solid and continuous material, with no gaps at the base of the barrier, at barrier corners, between individual panels/sections, or elsewhere. The barrier material should provide a transmission loss of at least 20 db, so that the noise travelling through the material is negligible compared to the noise diffraction over the top of the barrier. For instance, steel Page 9 of 23
panels with a minimum thickness of 0.95 mm (20 gauge or thicker) will meet this requirement. As shown on the Site Plan, barriers A and B must return to the building at the North-East edge. This will avoid the potential for noise generated in these areas to be reflected off of the C or D barriers, and travel back in the direction of residential buildings. Any outdoor access to these areas should be installed on the North-East side. Barriers C and D do not have this condition, and as such have no requirement for a noise barrier on the North-East segment. Page 10 of 23
3.0 CITY OF OTTAWA NOISE BYLAW REQUIREMENTS 3.1 SOUND LEVEL CRITERIA Per Items 4 and 5 of the City of Ottawa Noise Bylaw, HVAC and exhaust equipment must not exceed 50 dba measured at the point of reception. 3.2 ALLOWABLE UNIT SOUND POWER LEVEL The proposed HVAC unit will be located near the back of the new kennel. While the exact location of the unit is not known, this assessment presumes a worst-case scenario. As shown on the Site Plan (Appendix A), the unit is presumed to be at roughly the mid-point of the rear section of the building, located on the rooftop. Line-of-sight is presumed between source and receiver, meaning that no barrier shielding has been accounted for. In this location, there is approximately 185 m of horizontal separation to the property line of the nearest residence across Fourth Line Road. Per AHRI 275-2010, this corresponds to 53 db of noise attenuation due to distance (see calculation example in Appendix B). Therefore, in order to meet the City's 50 dba requirement, the sound power level of the unit must not exceed 103 dba SWL. Page 11 of 23
Attachments: Appendix A: Site Plans Appendix B: Detailed Noise Attenuation Calculations Page 13 of 23
APPENDIX A: SITE PLANS (attachment to report dated ) Page 14 of 23
Page 15 of 23
Page 16 of 23
APPENDIX B: DETAILED NOISE ATTENUATION CALCULATIONS (attachment to report dated ) All calculations have been completed in accordance with ANSI/AHRI Standard 275-2010. The Distance Attenuation and Barrier Effect have been computed as per the procedure outlined in the Standard, summarized as follows: Distance Attenuation The attenuation due to distance, or Distance Factor (DF) in decibels, is given as follows: DF = 20 log10 (D) 8 (1) Where D is the distance between the source and receiver, in metres. Barrier Attenuation The attenuation due to barrier shielding is determined by computing the shortest path from the source to the receiver, travelling around the barrier, and subtracting the direct source-receiver distance D : L=L1+L 2 D Where (2) L1+L2 is the shortest path around the barrier in metres: L1 is the distance from the source to a point on the edge of the barrier, and L2 is the distance from this same point on the barrier to the receive. The barrier attenuation, or Barrier Shielding Factor in decibels, is then determined by rounding the value of L to the nearest entry in the table below. L [m] Table B.1: Barrier Shielding Factor Values 0.15 0.3 0.6 0.9 Factor Value [db] 4 7 10 12 1.8 3.7 15 17 Page 17 of 23
Total Attenuation The total attenuation, in decibels, is the sum of the Distance Factor and the Barrier Shielding Factor. Analysis The table below shows the results of attenuation calculations. The attenuation due to a distance of 215 m is first determined, which sets the criteria for all other predictions. Predictions were then made to one or several potential worst-case source-receiver scenarios. In most cases this corresponds to the scenario providing the least barrier shielding any decline in distance attenuation for dogs located closer to the barriers is minor compared to the associated increase in barrier attenuation. The barrier heights shown for each scenario are the minimum height at which the barrier provides the required attenuation for that particular scenario. The final barrier heights are defined as the greatest height value in the table for a given barrier. The lines referenced below are identified in the site plans following. Page 18 of 23
Table B.2: Detailed Calculation Results Heights Above Ground (m) Scenario Description City of Ottawa Bylaw Requirement Line A1 Line A2 Line B1 Line B2 Line B3 Line C1 Line C2 Line D1 Horizontal Distances (m) Source to Source to Receive Barrier Barrier Source Receive Barrier (none) n/a 215 A A B B B C C D 4.0 4.0 3.6 3.7 3.6 3.6 2.8 2.8 2.5 2.1 19 184.7 198.8 200.7 204.5 206.7 205.3 210.9 ANSI/AHRI 275-2010 Lengths (m) ANSI/AHRI 2752010 Factors (db) Total Attenuation (db) L1 L2 D L Barrier Shielding Distance Total n/a n/a n/a 215 n/a 0 54.6 54.6 31.7 23.1 30.5 30.0 10.0 8.6 5.6 1.9 31.8 23.2 30.6 30.1 10.1 8.7 5.7 2.0 0.08 0.09 0.09 0.09 0.09 0.09 0.09 0.09 4 4 4 4 4 4 4 4 53.6 53.3 54.0 54.1 54.2 54.3 54.2 54.5 57.6 57.3 58.0 58.1 58.2 58.3 58.2 58.5 159.8 19 161.6 184.7 168.3 198.8 170.7 200.7 194.5 204.5 198.1 206.7 199.7 205.3 209.0 210.9 Page 19 of 23
Page 20 of 23
Page 21 of 23
Page 22 of 23
Page 23 of 23