ADDENDUM TO ACOUSTIC ANAYLSIS MADAKET WIND TUBRINE PROJECT NANTUCKET… · 2011-10-18 · ADDENDUM...

ADDENDUM TO ACOUSTIC ANAYLSIS MADAKET WIND TUBRINE PROJECT

NANTUCKET, MA October 6, 2011

The Town of Nantucket (the Client) is proposing to construct a wind turbine on the Nantucket Landfill property located at 188 Madaket Road in Nantucket, Massachusetts. The proposed location of the turbine is shown in Figure 1. The turbine is currently proposed to be a PowerWind PW56 machine, with a power output of 900 kW, a hub height of 71 meters (233 feet), and a 56 meter (184 foot) rotor diameter (i.e. 28 meter blade lengths) with an overall height of 99 meters (325 feet).

On behalf of the client, Atlantic Design Engineers, LLC has completed an addendum to the original acoustic analysis prepared for the Madaket Wind Turbine Project, dated February 25, 2011 in order to assess noise effects from the initial two turbine project at various property lines near abutting residential properties. This addendum has been completed in order to assess a single turbine project with a location change for the remaining turbine (see Figure 1 for the revised location). The new study results were evaluated for compliance with The Commonwealth of Massachusetts Department of Environmental Protection (MA DEP) Noise Control Regulation 310 CMR 7.10, and the Code of the Town of Nantucket, Chapter 101, which addresses general noise regulations.

Atlantic had previously conducted on-site ambient noise measurements to establish the current sound pressure levels (in decibels), at four (4) locations on the project property. The information gathered from these measurements was used in concert with data provided from the wind turbine manufacturer, wind speed data obtained from an on-site location, and the software program WindPRO Version 2.7.473 to determine the projected sound levels that will be produced at the designated locations (see Figure 2) once the turbine is in operation. The data collected at each location was examined in order to determine a correlation between wind speeds and noise levels, as typically ambient noise levels increase when wind speed increases. For each location, this correlation was used by WindPRO to determine the projected noise levels at different wind speeds. If no correlation could be established due to a lack of varying wind speeds during measurement periods, then a conservative approach was used that assumes there is no increase in noise levels as wind speeds increase.

The projected sound values were reviewed for compliance with both the state and town bylaws and regulations. The results of the calculations are summarized in Tables 1 & 2 (below), which show the maximum projected sound levels at the chosen locations.

Table 1 DEP Compliance Table

Maximum Sound Increase (8m/s @ 10m Reference Height)

*Please Note: Addresses are based upon the Town of Nantucket GIS

Location

Ambient L90

Level (dBA)

Wind Turbine Sound (dBA)

Combined Sound Level (dBA)

Net Increase (dBA)

Compliance With Applicable

Criteria?

Sound Level Monitoring Location #3 (3 Ridge Ln.)

34 27 35 1 Yes

Residential Receptor #1-1 (22 Massasoit Bridge Rd.)

34 40 41 7 Yes

Residential Receptor #1-2 (10 Massasoit Bridge Rd.)

34 30 36 2 Yes

Residential Receptor #2-1 (4 Long Pond Dr.)

34 28 35 1 Yes

Residential Receptor #2-2 (197 Madaket Rd.)

34 28 35 1 Yes


34 28 35 1 Yes


34 30 35 1 Yes

Residential Receptor #2-5 (6 Arkansas Ave.)

34 22 34 0 Yes

Residential Receptor #3-1 (7 Warrens Landing Rd.)

34 27 35 1 Yes

Residential Receptor #3-2 (4 Creek Ln.)

34 26 35 1 Yes

Residential Receptor #4-1 (4 Fintry Ln.)

41 30 41 0 Yes

Residential Receptor #4-2 (23 Bishops Rise)

41 27 41 0 Yes


41 30 41 0 Yes

Residential Receptor #4-4 (90 Eel Point Rd.)

41 25 41 0 Yes

Residential Receptor #4-5 (110 Eel Point Rd.)

41 23 41 0 Yes

Acoustic Analysis Addendum Atlantic Design Engineers, LLC Madaket Wind Turbine Project October 6th, 2011 Nantucket, MA

Acoustic Analysis Addendum Atlantic Design Engineers, LLC Madaket Wind Turbine Project October 6th, 2011 Nantucket, MA

Table 2 Town of Nantucket Code Compliance Table

Maximum Sound Power Level (11m/s @ 10m Reference Height)

Location Ambient

L90 Level (dBA)

Max. Allowable Turbine Sound

at Receptor

Projected Turbine Sound at Receptor

(dBA)

Compliance With Applicable

Criteria? PL Receptor #1-1 (NE Property Line) 37 45 44 Yes PL Receptor #1-2 (S Property Line) 37 45 56 No PL Receptor #1-3 (NW Property Line) 37 45 35 Yes PL Receptor #1-4 (W Property Line) 37 45 42 Yes

The proposed Madaket Wind Turbine Project complies with noise requirements set forth in the Code of the Town of Nantucket bylaw on noise by limiting proposed noise levels to less than 45 dBA at the nearest residences. The noise levels (turbine generated) at nearby residences are calculated to be a maximum of 41 dBA (Shown in Figure 4). This is below the 45 dBA sound threshold established by the Town of Nantucket noise bylaw.

The proposed Madaket Wind Turbine Project complies with the Massachusetts Department of Environmental Protection Noise Policy by not increasing noise levels at nearby residential properties by more than 10 decibels. The turbine is expected to increase the ambient L90 sound level by a range of 0 dBA to 7 dBA at nearby residential properties (shown in Figure 5), below the DEP allowable. In addition, the PowerWind PW56 wind turbine is not anticipated to produce any audible “pure tones”, as sound emissions from modern wind turbines are mostly comprised of broadband tones.

The proposed Madaket Wind Turbine Project is projected to have turbine generated noise levels in excess of 45 dBA at the Town Landfill’s property line south of the proposed turbine. The noise levels (turbine generated) at the nearest property line are calculated to have a maximum level of 56 dBA. This level is above the 45 dBA nighttime sound threshold established by the Town of Nantucket noise bylaw. However, the abutting properties to the project property lines where the 45 dBA is exceeded are all undeveloped conservation land where present and future development is restricted, and in conversations with the Nantucket Island Land Bank, owners of the properties in question, they have indicated they would have no objection to the exceedance of the noise standard at their property line from the proposed project. See Figure 6 for the projected turbine generated sound level contours for the proposed project.

WindPRO version 2.7.486 Jan 2011

WindPRO is developed by EMD International A/S, Niels Jernesvej 10, DK-9220 Aalborg Ø, Tlf. +45 96 35 44 44, Fax +45 96 35 44 46, e-mail: [email protected]

Project:

2685 Noise New PW specs - official turbine location 10.4.2011Printed/Page

10/6/2011 11:33 AM / 1Licensed user:

Atlantic Design Engineers, LLC P.O. Box 1051 US-SANDWICH MA 02563508 888 9282Chris Sanderson / [email protected]:

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DECIBEL - Main ResultCalculation: 1-PowerWind 900KWNoise calculation model: ISO 9613-2 GeneralWind speed: 2.0 m/s - 11.0 m/s, step 1.0 m/sGround attenuation: General, Ground factor: 0.5Meteorological coefficient, C0: 0.0 dBType of demand in calculation: 2: WTG plus ambient noise is compared to ambient noise plus margin (FR etc.)Noise values in calculation: All noise values are mean values (Lwa) (Normal)Pure tones: Pure and Impulse tone penalty are added to WTG source noiseHeight above ground level, when no value in NSA object: 1.5 m Allow override of model height with height from NSA objectDeviation from "official" noise demands. Negative is more restrictive,positive is less restrictive.: 0.0 dB(A) Scale 1:40,000

New WTG Noise sensitive area

WTGsGeo DMS: WGS 84 WTG type Noise data

Longitude Latitude Z Row data/Description Valid Manufact. Type-generator Power, Rotor Hub Creator Name First LwaRef Last LwaRef Pure Octaverated diameter height wind wind tones data

speed speed[m] [kW] [m] [m] [m/s] [dB(A)] [m/s] [dB(A)]

1 -70°09'52.02" East 41°16'36.82" North 5.0 T-1, Compost Site, 900KW Yes PowerWind PowerWind 56-900 900 56.0 71.0 USER Noise_Brochure 2.0 90.4 11.0 104.9 0 dB Generic *)*)Notice: One or more noise data for this WTG is generic or input by user

Calculation Results

Sound LevelNoise sensitive areaGeo DMS: WGS 84 Demands Sound Level Demands fulfilled ?No. Name Longitude Latitude Z Imission Max Max Max Max Max Noise

height Additional Noise From Ambient+WTGs Additionalexposure demand WTGs exposure

[m] [m] [dB(A)] [dB(A)] [dB(A)] [dB(A)] [dB(A)]A SLM3 -70°10'29.69" East 41°17'04.41" North 5.4 1.5 10.0 28.4 40.3 0.8 YesB PL 1-1 -70°09'41.75" East 41°16'41.96" North 7.8 1.5 0.0 45.0 43.5 44.4 9.0 YesC PL 1-2 -70°09'51.73" East 41°16'35.31" North 4.0 1.5 0.0 45.0 55.7 55.8 20.7 NoD PL 1-3 -70°10'16.65" East 41°16'48.82" North 2.7 1.5 0.0 45.0 34.9 39.1 2.9 YesE Res1-1 -70°10'06.65" East 41°16'31.41" North 2.9 1.5 10.0 40.8 42.3 6.8 YesF Res1-2 -70°10'28.23" East 41°16'22.91" North 5.8 1.5 10.0 31.3 38.0 1.5 YesG Res2-1 -70°10'42.93" East 41°16'42.74" North 2.7 1.5 10.0 28.7 37.6 0.9 YesH Res2-2 -70°10'41.16" East 41°16'47.49" North 2.7 1.5 10.0 28.7 37.6 0.9 YesI Res2-3 -70°10'27.63" East 41°17'00.22" North 4.9 1.5 10.0 29.6 37.7 1.1 YesJ Res2-4 -70°10'29.95" East 41°16'49.57" North 2.7 1.5 10.0 31.1 38.0 1.4 YesK Res2-5 -70°11'15.07" East 41°16'34.13" North 5.7 1.5 10.0 23.0 37.2 0.3 YesL Res3-1 -70°10'36.24" East 41°17'02.21" North 5.8 1.5 10.0 27.8 38.4 0.7 YesM Res3-2 -70°10'41.12" East 41°16'59.58" North 3.7 1.5 10.0 27.4 38.4 0.7 YesN Res4-1 -70°09'30.70" East 41°17'05.14" North 5.8 1.5 10.0 30.6 47.1 0.3 YesO Res4-2 -70°09'02.32" East 41°16'57.44" North 18.0 1.5 10.0 27.6 47.0 0.2 YesP Res4-3 -70°09'10.17" East 41°16'47.05" North 18.0 1.5 10.0 30.4 47.1 0.3 YesQ Res4-4 -70°10'06.80" East 41°17'24.86" North 2.7 1.5 10.0 25.9 47.0 0.1 YesR Res4-5 -70°10'13.01" East 41°17'31.71" North 5.5 1.5 10.0 24.2 47.0 0.1 YesS PL 1-4 -70°10'04.86" East 41°16'32.16" North 3.8 1.5 0.0 45.0 42.1 43.3 7.8 Yes



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DECIBEL - Main ResultCalculation: 1-PowerWind 900KWDistances (m)

WTGNSA 1

A 1220B 286C 47D 681E 378F 944G 1195H 1187I 1098J 964K 1929L 1291

M 1339N 1005O 1317P 1021Q 1522R 1763S 331



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DECIBEL - Detailed resultsCalculation: 1-PowerWind 900KWNoise calculation model: ISO 9613-2 General

SLM3 (A)Demands Sound Level Result

Wind Ambient Allowed WTG Ambient+WTGs Additional Demands fulfilledspeed noise addition noise exposure ?

exposure[m/s] [dB(A)] [dB(A)] [dB(A)] [dB(A)] [dB(A)]2.0 26.0 10.0 14.0 26.3 0.3 Yes3.0 28.0 10.0 14.0 28.2 0.2 Yes4.0 29.0 10.0 14.0 29.1 0.1 Yes5.0 30.0 10.0 19.2 30.3 0.3 Yes6.0 32.0 10.0 23.1 32.5 0.5 Yes7.0 33.0 10.0 25.7 33.7 0.7 Yes8.0 34.0 10.0 27.3 34.8 0.8 Yes9.0 36.0 10.0 28.1 36.7 0.7 Yes10.0 38.0 10.0 28.3 38.4 0.4 Yes11.0 40.0 10.0 28.4 40.3 0.3 Yes

PL 1-1 (B)Demands Sound Level Result



PL 1-2 (C)Demands Sound Level Result

Wind Ambient Allowed WTG Ambient+WTGs Additional Demandsspeed noise addition noise exposure fulfilled

exposure ?[m/s] [dB(A)] [dB(A)] [dB(A)] [dB(A)] [dB(A)]2.0 27.0 0.0 41.3 41.4 14.4 Yes3.0 28.0 0.0 41.3 41.5 13.5 Yes4.0 29.0 0.0 41.3 41.5 12.5 Yes5.0 30.0 0.0 46.5 46.6 16.6 No6.0 32.0 0.0 50.4 50.4 18.4 No7.0 33.0 0.0 53.1 53.1 20.1 No8.0 34.0 0.0 54.7 54.7 20.7 No9.0 35.0 0.0 55.4 55.5 20.5 No

10.0 36.0 0.0 55.6 55.7 19.7 No11.0 37.0 0.0 55.7 55.8 18.8 No



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PL 1-3 (D)Demands Sound Level Result



Res1-1 (E)Demands Sound Level Result



Res1-2 (F)Demands Sound Level Result





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Res2-1 (G)Demands Sound Level Result



Res2-2 (H)Demands Sound Level Result



Res2-3 (I)Demands Sound Level Result





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Res2-4 (J)Demands Sound Level Result



Res2-5 (K)Demands Sound Level Result



Res3-1 (L)Demands Sound Level Result





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Res3-2 (M)Demands Sound Level Result



Res4-1 (N)Demands Sound Level Result



Res4-2 (O)Demands Sound Level Result





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Res4-3 (P)Demands Sound Level Result



Res4-4 (Q)Demands Sound Level Result



Res4-5 (R)Demands Sound Level Result





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PL 1-4 (S)Demands Sound Level Result





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DECIBEL - Assumptions for noise calculationCalculation: 1-PowerWind 900KWNoise calculation model: ISO 9613-2 GeneralNoise calculation model: ISO 9613-2 GeneralWind speed: 2.0 m/s - 11.0 m/s, step 1.0 m/sGround attenuation: General, Ground factor: 0.5Meteorological coefficient, C0: 0.0 dBType of demand in calculation: 2: WTG plus ambient noise is compared to ambient noise plus margin (FR etc.)Noise values in calculation: All noise values are mean values (Lwa) (Normal)Pure tones: Pure and Impulse tone penalty are added to WTG source noiseHeight above ground level, when no value in NSA object: 1.5 m Allow override of model height with height from NSA objectDeviation from "official" noise demands. Negative is more restrictive, positive is less restrictive.: 0.0 dB(A)Octave data requiredAir absorption

63 125 250 500 1,000 2,000 4,000 8,000[db/km] [db/km] [db/km] [db/km] [db/km] [db/km] [db/km] [db/km]

0.1 0.4 1.0 1.9 3.7 9.7 32.8 117.0

WTG: PowerWind PowerWind 56 900 56.0 !O!Noise: Noise_Brochure

Source Source/Date Creator EditedBrochure from SED 2/24/2011 USER 8/16/2011 3:22 PM

Octave dataStatus Hub height Wind speed LwA,ref Pure tones 63 125 250 500 1000 2000 4000 8000

[m] [m/s] [dB(A)] [dB] [dB] [dB] [dB] [dB] [dB] [dB] [dB]From other hub height 71.0 2.0 90.4 No Generic data 72.0 79.0 82.4 85.0 84.8 81.9 77.1 67.6From other hub height 71.0 3.0 90.4 No Generic data 72.0 79.0 82.4 85.0 84.8 81.9 77.1 67.6From other hub height 71.0 4.0 90.4 No Generic data 72.0 79.0 82.4 85.0 84.8 81.9 77.1 67.6From other hub height 71.0 5.0 95.6 No Generic data 77.2 84.2 87.6 90.2 90.0 87.1 82.3 72.8From other hub height 71.0 6.0 99.5 No Generic data 81.1 88.1 91.5 94.1 93.9 91.0 86.2 76.7From other hub height 71.0 7.0 102.2 No Generic data 83.8 90.8 94.2 96.8 96.6 93.7 88.9 79.4From other hub height 71.0 8.0 103.8 No Generic data 85.4 92.4 95.8 98.4 98.2 95.3 90.5 81.0From other hub height 71.0 9.0 104.6 No Generic data 86.2 93.2 96.6 99.2 99.0 96.1 91.3 81.8From other hub height 71.0 10.0 104.8 No Generic data 86.4 93.4 96.8 99.4 99.2 96.3 91.5 82.0From other hub height 71.0 11.0 104.9 No Generic data 86.5 93.5 96.9 99.5 99.3 96.4 91.6 82.1

NSA: SLM3-APredefined calculation standard: Imission height(a.g.l.): Use standard value from calculation model

Ambient noise:

2.0 [m/s] 3.0 [m/s] 4.0 [m/s] 5.0 [m/s] 6.0 [m/s] 7.0 [m/s] 8.0 [m/s] 9.0 [m/s]26.0 dB(A) 28.0 dB(A) 29.0 dB(A) 30.0 dB(A) 32.0 dB(A) 33.0 dB(A) 34.0 dB(A) 36.0 dB(A)

Margin or Allowed additional exposure: 10.0 dB(A)Sound level always accepted: 0.0 dB(A)Distance demand: 0.0 m



Project:


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DECIBEL - Assumptions for noise calculationCalculation: 1-PowerWind 900KWNoise calculation model: ISO 9613-2 GeneralNSA: PL 1-1-BPredefined calculation standard: Imission height(a.g.l.): Use standard value from calculation model

Ambient noise:



NSA: PL 1-2-CPredefined calculation standard: Imission height(a.g.l.): Use standard value from calculation model

Ambient noise:



NSA: PL 1-3-DPredefined calculation standard: Imission height(a.g.l.): Use standard value from calculation model

Ambient noise:



NSA: Res1-1-EPredefined calculation standard: Imission height(a.g.l.): Use standard value from calculation model

Ambient noise:

2.0 [m/s] 3.0 [m/s] 4.0 [m/s] 5.0 [m/s] 6.0 [m/s] 7.0 [m/s] 8.0 [m/s] 9.0 [m/s] 10.0 [m/s] 11.0 [m/s]27.0 dB(A) 28.0 dB(A) 29.0 dB(A) 30.0 dB(A) 32.0 dB(A) 33.0 dB(A) 34.0 dB(A) 35.0 dB(A) 36.0 dB(A) 37.0 dB(A)


NSA: Res1-2-FPredefined calculation standard: Imission height(a.g.l.): Use standard value from calculation model

Ambient noise:




Project:


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10/6/2011 11:31 AM/2.7.486

DECIBEL - Assumptions for noise calculationCalculation: 1-PowerWind 900KWNoise calculation model: ISO 9613-2 General


NSA: Res2-1-GPredefined calculation standard: Imission height(a.g.l.): Use standard value from calculation model

Ambient noise:



NSA: Res2-2-HPredefined calculation standard: Imission height(a.g.l.): Use standard value from calculation model

Ambient noise:



NSA: Res2-3-IPredefined calculation standard: Imission height(a.g.l.): Use standard value from calculation model

Ambient noise:



NSA: Res2-4-JPredefined calculation standard: Imission height(a.g.l.): Use standard value from calculation model

Ambient noise:





Project:


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DECIBEL - Assumptions for noise calculationCalculation: 1-PowerWind 900KWNoise calculation model: ISO 9613-2 GeneralNSA: Res2-5-KPredefined calculation standard: Imission height(a.g.l.): Use standard value from calculation model

Ambient noise:



NSA: Res3-1-LPredefined calculation standard: Imission height(a.g.l.): Use standard value from calculation model

Ambient noise:



NSA: Res3-2-MPredefined calculation standard: Imission height(a.g.l.): Use standard value from calculation model

Ambient noise:



NSA: Res4-1-NPredefined calculation standard: Imission height(a.g.l.): Use standard value from calculation model

Ambient noise:



NSA: Res4-2-OPredefined calculation standard: Imission height(a.g.l.): Use standard value from calculation model

Ambient noise:




Project:


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10/6/2011 11:31 AM/2.7.486

DECIBEL - Assumptions for noise calculationCalculation: 1-PowerWind 900KWNoise calculation model: ISO 9613-2 General


NSA: Res4-3-PPredefined calculation standard: Imission height(a.g.l.): Use standard value from calculation model

Ambient noise:



NSA: Res4-4-QPredefined calculation standard: Imission height(a.g.l.): Use standard value from calculation model

Ambient noise:



NSA: Res4-5-RPredefined calculation standard: Imission height(a.g.l.): Use standard value from calculation model

Ambient noise:



NSA: PL 1-4-SPredefined calculation standard: Imission height(a.g.l.): Use standard value from calculation model

Ambient noise:





Project:


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DECIBEL - Map 11.0 m/sCalculation: 1-PowerWind 900KWNoise calculation model: ISO 9613-2 General

0 250 500 750 1000 mMap: , Print scale 1:20,000, Map center Geo WGS 84 East: -70°09'51.98" North: 41°16'36.81"

Noise calculation model: ISO 9613-2 General. Wind speed: 11.0 m/sNew WTG Noise sensitive area

Height above sea level from active line object35.0 dB(A) 40.0 dB(A) 45.0 dB(A) 50.0 dB(A) 55.0 dB(A)

ADDENDUM TO ACOUSTIC ANAYLSIS MADAKET WIND TUBRINE PROJECT NANTUCKET… · 2011-10-18 · ADDENDUM...

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Transcript of ADDENDUM TO ACOUSTIC ANAYLSIS MADAKET WIND TUBRINE PROJECT NANTUCKET… · 2011-10-18 · ADDENDUM...