8/1/2019 Appendix II Background Sound

1/9

Project : WINDPARK URIRAMA

Subject : Report on Background soundmeasurements for planned windpark Urirama

Ref.nr : p-1123-19/mr/LH

Date : May 2, 2012

Author: ing. L.H.M. Hamers

8/1/2019 Appendix II Background Sound

2/9

Table of content Page

1. Summary. ................................................................................................................... 12. Situations at the measuring locations. ........................................................................ 13. Area conditions at each measuring location. .............................................................. 34. Applied instrumentation. ............................................................................................. 55. Measuring conditions. ................................................................................................. 56. Measuring results. ...................................................................................................... 6

8/1/2019 Appendix II Background Sound

3/9

1 Wind park Urirama

p-1123-19/mr/LH

1. Summary.

On request of KEMA, the company preparing the Social and EnvironmentalAssessment for wind park Urirama, Polytechnisch Ingenieursbureau N.V. (PIB)performed background measurements at three locations in the area close to thefuture wind park Urirama.The measurements were made between 23.20 hours and 02.54 hours on April 21,22 and 23, 2012.In order to take into account the possible relation between the sound pressure andthe wind, the wind direction and wind velocity were also recorded.

2. Situations at the measuring locations.

Locations of the projected windmills at Urirama are shown on figure 1.Measuring locations are shown on the Google maps figures 2, 3, 4.Distances of the nearest windmill to the measuring location are indicated.Distances of the measuring location to the nearest dwelling are also shown.

Figure 1, Locations of the projected windmills at Urirama

8/1/2019 Appendix II Background Sound

4/9

2 Wind park Urirama

p-1123-19/mr/LH

Figure 2, Measuring location no. 1 Sero Pela, distance to windmill ca. 816 meters.

Figure 3, Measuring location no. 2, Sero di Pos di Nord, distance to windmill ca. 814 meters.

8/1/2019 Appendix II Background Sound

5/9

3 Wind park Urirama

p-1123-19/mr/LH

Figure 4, Measuring location no. 3, Calabas, distance to windmill ca. 904 meters.

3. Area conditions at each measuring location.

Measuring point 1.Almost flat terrain with low vegetation at the first 100 meters from the measuringpoint.

No significant wind or sound obstacles.No disturbing sound sources in the area during measurement.Measuring point is located at a sand path.Distance to closest dwelling about 15 meters.Distance to nearest projected windmill ca. 816 meters.Wind direction stable East to West (90 degrees).

Picture A Measuring point 1 to windmills Picture A1 Measuring point back side

8/1/2019 Appendix II Background Sound

6/9

4 Wind park Urirama

p-1123-19/mr/LH

Measuring point 2.Accidented terrain with vegetation and trees up to 2 meters high.These conditions cause wind turbulences and some sound damping in the directionof the windmills.

No significant other wind or sound obstacles.No disturbing sound sources in the area during measurements. Noise of the sea wasobserved at low wind speed conditions.Measuring point is located at a sand road.Three houses are located in the back of the measuring point.Distance to the closest dwelling is about 20 meters.Distance to nearest projected windmill is ca. 814 meters.Wind direction stable East to West (90 degrees).

Picture B, Measuring point 2 sand road Picture B1, Measuring point 2 back side

Measuring point 3.Accidented terrain with a big sand excavation pit at a distance of 50 meters in the

line from the measuring location to the windmills.No significant vegetation in the windmills direction.No significant wind or sound obstacles.No disturbing sounds sources in the area during measurements. Close pig farm wasquiet.Measuring point is located at a sand road to the excavation pit. One shadow shed islocated in the back of the measuring point at a 6 meter distance (picture C2).Distance to the nearest dwelling is ca. 75 meters.Distance to nearest projected windmill is ca. 904 meters.Wind direction stable East to West (90 degrees).

Picture C, Measuring point 3, sand road Picture C1, Measuring point 3, nearest dwelling

8/1/2019 Appendix II Background Sound

7/9

5 Wind park Urirama

p-1123-19/mr/LH

Picture C2, Measuring point 3, back side

4. Applied instrumentation.

Sound meter on tripod stand:Manufacturer RIONModel NA-24With windscreen WS-10

Sound calibrator:Manufacturer RIONModel NC-73

Wind speed anemometer:Manufacturer TESTOModel Testo 417 with

Testo 452 measuring device.Note: some inaccuracy as calibration date passed.

Compass:For wind direction.

5. Measuring conditions.

Sound meter calibrated : Calibration on 94 dB(A)

Sound meter settings : Scale AFast record

Height measuring points : At height 2,8-3,0 metersTemperature : 28 degrees CHumidity : No rain, 80% humiditySky : Partly cloudedWind direction : East to West

8/1/2019 Appendix II Background Sound

8/9

6 Wind park Urirama

p-1123-19/mr/LH

6. Measuring results.

Measuring point 1Soundpressurelevel

Windvelocity

Soundpressurelevel

Windvelocity

ResultingL95 Soundlevel

Date Time dB(A) min m/sec dB(A)max

m/sec dB(A) Remarks

22-04-2012 00:40 39,4 2,7 43,2 3,6

22-04-2012 00:44 45,1 4,4 47,8 5,0

22-04-2012 00:48 45,0 3,2 47,8 5,1 L95 = 44

22-04-2012 00:54 40,8 2,0 45,1 3,8

22-04-2012 00:59 40,8 3,2 45,7 5,5

22-04-2012 02:40 46,4 2,6 49,0 5,0

22-04-2012 02:42 46,3 2,6 48,4 4,6

22-04-2012 02:45 40,6 2,6 47,3 4,8 L95 = 45

22-04-2012 02:50 40,3 2,6 45,6 4,6

22-04-2012 02:54 40,7 2,8 46,9 4,9

23-04-2012 00:25 36,8 2,6 41,3 3,3

23-04-2012 00:28 39,8 2,9 43,7 4,5

23-04-2012 00:29 41,0 3,0 44,6 4,7 L95 = 41

23-04-2012 00:32 39,4 1,3 40,9 2,9

23-04-2012 00:35 39,2 2,9 40,1 3,3

Measuring point 2Sound

pressurelevel

Wind

velocity

Sound

pressurelevel

Wind

velocity

Resulting

L95 SoundlevelDate Time dB(A)

minm/sec dB(A)

maxm/sec dB(A) Remarks

22-04-2012 00:00 38,7 1,5 41,5 3,8

22-04-2012 00:02 38,3 1,3 41,0 2,9 noise of the sea

22-04-2012 00:07 38,1 1,5 40,5 3,6 L95= 40

22-04-2012 00:10 37,8 1,8 43,7 4,7

22-04-2012 00:13 38,1 1,5 40,4 3,0

22-04-2012 02:10 40,6 2,6 45,0 3,5

22-04-2012 02:14 38,7 1,7 40,0 2,2

22-04-2012 02:18 37,9 1,1 44,0 4,7 L95 = 42 noise of the sea22-04-2012 02:22 47,3 4,6 57,1 6,0

22-04-2012 02:25 40,0 2,6 46,8 4,2

22-04-2012 23:50 38,1 1,9 41,7 3,7

22-04-2012 23:53 40,5 1,4 43,3 2,2 noise of the sea

22-04-2012 23:56 37,7 2,2 40,3 3,1 L95 = 39

23-04-2012 00:00 37,0 1,2 40,4 2,5 noise of the sea

23-04-2012 00:03 37,6 1,5 38,2 2,2

8/1/2019 Appendix II Background Sound

9/9

7 Wind park Urirama

p-1123-19/mr/LH

Measuring point 3Soundpressurelevel

Windvelocity

Soundpressurelevel

Windvelocity

ResultingL95 Soundlevel

Date Time dB(A)min m/sec dB(A)

max

m/sec dB(A) Remarks

21-04-2012 23:30 39,1 1,7 39,9 2,3

21-04-2012 23:35 38,3 1,5 40,2 2,2

21-04-2012 23:37 39,1 1,7 43,0 4,0 L95 = 40

21-04-2012 23:40 38,6 1,5 40,6 2,2

21-04-2012 23:42 38,8 1,1 41,4 3,3

22-04-2012 01:30 44,4 1,5 49,0 3,0

22-04-2012 01:34 42,0 1,1 48,3 3,2

22-04-2012 01:40 45,5 1,1 48,2 3,2 L95 = 46

22-04-2012 01:45 45,2 2,2 48,8 3,0

22-04-2012 01:50 46,7 2,0 50,0 5,1

23-04-2011 23:20 40,1 1,7 43,1 2,9

23-04-2011 23:23 36,8 1,4 39,0 2,2

23-04-2011 23:26 40,6 1,3 41,5 2,5 L95 = 39

23-04-2011 23:30 35,7 1,0 38,9 2,4

23-04-2011 23:33 38,4 1,0 40,1 2,4