Annex H6 Clocaenog Forest Wind Farm Cumulative Assessment Figures
H6.1 CUMULATIVE IMPACT ASSESSMENT The turbine coordinates used in the predictions for Tir Mostyn, Brenig, Gorsedd Bran, Derwydd Bach, and Nant Bach are shown in Table H6.1 and Table H6.2. Table H6.1 Wind turbine coordinates for neighbouring Tir Mostyn, Brenig and Gorsedd Bran wind farms Tir Mostyn Brenig Gorsedd Bran Turbine Easting Northing Turbine Easting Northing Turbine Easting Northing 1 09 90 1 299333 81 1 2964 9195 2 07 8880 2 2998 7933 2 297012 9176 3 07 89 3 299790 87 3 297522 9195 4 0242 8984 4 0027 8421 4 297571 8848 5 00 8824 5 299780 8623 5 297951 8908 6 0288 87 6 299547 85 6 296985 9527 7 05 8683 7 2992 78 7 2971 9519 8 0336 81 8 299411 7567 8 297775 96 9 0297 8223 9 2995 73 9 2979 9279 10 0569 8166 10 299224 7279 10 297229 9888 11 0085 8077 11 298980 7485 11 297596 9894 12 299884 7903 12 298916 7134 12 2975 3232 13 06 78 13 299141 6895 13 297808 35 14 0482 7919 14 2994 6932 0758 7895 299794 7043 16 0677 6694 16 299698 6722 17 04 13 18 0680 6423 19 04 6280 06 6193 21 0344 37 22 0710 5980 23 0585 5811 24 0189 5821 0427 53 Table H6.2 Wind turbine coordinates for neighbouring Derwydd Bach and Nant Bach wind farms Derwydd Bach Nant Bach Turbine Easting Northing Turbine Easting Northing 1 2242 348999 1 297918 346739 2 47 349231 2 298075 347077 3 2727 3490 3 298242 3468 4 2896 3494 4 298469 347267 5 2718 349571 5 298811 347701 6 27 349903 6 2990 347444 7 37 349803 7 299971 3471 8 70 01 8 299161 3478 9 3397 04 9 299528 3477 10 3732 05 10 299841 347595 11 0051 347466 Client: Page 1 of 33 / Annex H6 Issued by: RWE Npower Renewables Ltd. Hayes McKenzie Partnership Ltd.
Predicted noise levels from the existing Tir Mostyn site have been based on a reported (1) sound power level of a Gamesa G52 8kW wind turbine. For the purposes of these predictions a 1dB measurement uncertainty has been added to the reported sound power level. The stated overall reported sound power level is 103.0 db(a), at 10 m.s -1. The corresponding source noise levels used in these assessments are shown in Table H6.3. Table H6.3 Source sound power levels assumed for Tir Mostyn turbines db(a) re: 10-12 W Octave Band Centre Frequency (Hz) Reference Wind Speed: m.s -1 L WA 63 1 2 0 1k 2k 4k 8k 3 99.7 80.7 86.4 93.3 93.2 94.2 91.7 86.2 74.3 4 100.7 81.7 87.4 94.3 94.2 95.2 92.7 87.2 75.3 5 101.7 82.7 88.4 95.3 95.2 96.2 93.7 88.2 76.3 6 102.7 83.7 89.4 96.3 96.2 97.2 94.7 89.2 77.3 7 103.7 84.7 90.4 97.3 97.2 98.2 95.7 90.2 78.3 8 104.2 85.2 90.9 97.8 97.7 98.7 96.2 90.7 78.8 9 104.3 85.3 91.0 97.9 97.8 98.8 96.3 90.8 78.9 10 104.0 85.0 90.7 97.6 97.5 98.5 96.0 90.5 78.6 11 104.0 85.0 90.7 97.6 97.5 98.5 96.0 90.5 78.6 12 104.0 85.0 90.7 97.6 97.5 98.5 96.0 90.5 78.6 Predicted noise levels from the consented Brenig site have been based on the sound power level of a Vestas V80 2MW wind turbine, operating in the 101dB mode. The source noise levels used in this assessment are based on the levels stated in the Environmental Statement on which it is understood the Brenig scheme has been granted planning permission (2). The stated overall sound power level is 104.5 db(a), at 10 m.s -1. The corresponding source noise levels used in these assessments are shown in Table H6.4. Table H6.4 Source sound power levels assumed for Brenig turbines db(a) re: 10-12 W Octave Band Centre Frequency (Hz) Reference Wind Speed: m.s -1 L WA 63 1 2 0 1k 2k 4k 8k 3 93.8 72.9 82.8 88.6 89.2 85.9 83.2 75.7 59.8 4 96.0 75.1 85.0 90.8 91.4 88.1 85.4 77.9 62.0 5 101.0 80.1 90.0 95.8 96.4 93.1 90.4 82.9 67.0 6 102.1 81.2 91.1 96.9 97.5 94.2 91.5 84.0 68.1 7 102.5 81.6 91.5 97.3 97.9 94.6 91.9 84.4 68.5 8 102.9 82.0 91.9 97.7 98.3 95.0 92.3 84.8 68.9 9 103.7 82.8 92.7 98.5 99.1 95.8 93.1 85.6 69.7 10 104.5 83.6 93.5 99.3 99.9 96.6 93.9 86.4 70.5 11 105.7 84.8 94.7 100.5 101.1 97.8 95.1 87.6 71.7 12 106.4 85.5 95.4 101.2 101.8 98.5 95.8 88.3 72.4 (1) DEWI, 03. Measurement of the Acoustic Noise Emission of the Gamesa G52 Wind Turbine. Report No: DEWI S AM 126/03, dated 10/11/03 (2) Natural Power Consultants Ltd, April 07. Planning Application for the Proposed Wind Farm at Brenig, Denbighshire, North Wales. Environmental Statement Vol. 1 of 2. Client: Page 2 of 33 / Annex H6 Issued by: RWE Npower Renewables Ltd. Hayes McKenzie Partnership Ltd.
Predicted noise levels from the proposed Gorsedd Bran site have been based on the sound power level of 2.5MW wind turbine with an overall sound power level of 104.0 db(a), at 10 m.s -1. The corresponding source noise levels used in these assessments are shown in Table H6.5 below: Table H6.5 Source sound power levels assumed for Gorsedd Bran turbines db(a) re: 10-12 W Octave Band Centre Frequency (Hz) Reference Wind Speed: m.s -1 L WA 63 1 2 0 1k 2k 4k 8k 3 95.5 77.9 85.8 89.7 90.6 88.1 84.9 78.6 68.5 4 98.0 80.4 88.3 92.2 93.1 90.6 87.4 81.1 71.0 5 100.5 82.9 90.8 94.7 95.6 93.1 89.9 83.6 73.5 6 102.5 84.9 92.8 96.7 97.6 95.1 91.9 85.6 75.5 7 103.0 85.4 93.3 97.2 98.1 95.6 92.4 86.1 76.0 8 103.5 85.9 93.8 97.7 98.6 96.1 92.9 86.6 76.5 9 104.0 86.4 94.3 98.2 99.1 96.6 93.4 87.1 77.0 10 104.0 86.4 94.3 98.2 99.1 96.6 93.4 87.1 77.0 11 104.5 86.9 94.8 98.7 99.6 97.1 93.9 87.6 77.5 12 105.0 87.4 95.3 99.2 100.1 97.6 94.4 88.1 78.0 Predicted noise levels from the consented Derwydd Bach site have been based on the sound power levels of an Enercon E70 E4 2.3MW wind turbine. The source noise levels used in this assessment are based on the levels stated in the Environmental Statement on which it is understood the Derwydd Bach Wind Farm has been granted planning permission (1). As is stated in the ES for Derwydd Bach, turbines T3, T7, T9 are assumed to be operating in a noise restricted mode where the generated power is restricted to 1.2MW. The stated overall sound power level for the unrestricted and restricted modes of operation is 105.4 db(a) and 101.9 db(a), at 10 m.s -1 respectively. The corresponding source noise levels used in these assessments are shown in Table H6.6 and Table H6.7. Table H6.6 Source sound power levels assumed for Derwydd Bach unrestricted turbines db(a) re: 10-12 W Octave Band Centre Frequency (Hz) Reference Wind Speed: m.s -1 L WA 63 1 2 0 1k 2k 4k 8k 3 89.1 73.0 81.6 84.1 82.7 81.2 77.9 71.0 63.4 4 92.1 76.0 84.6 87.1 85.7 84.2 80.9 74.0 66.4 5 95.1 79.0 87.6 90.1 88.7 87.2 83.9 77.0 69.4 6 99.2 83.1 91.7 94.2 92.8 91.3 88.0 81.1 73.5 7 101.6 85.5 94.1 96.6 95.2 93.7 90.4 83.5 75.9 8 103.6 87.5 96.1 98.6 97.2 95.7 92.4 85.5 77.9 9 105.0 88.9 97.5 100.0 98.6 97.1 93.8 86.9 79.3 10 105.4 89.3 97.9 100.4 99.0 97.5 94.2 87.3 79.7 (1) Gifford, July 07. Derwydd Bach Wind Farm. Environmental Statement, Vol. 1. Report No. 134/ES/01. Client: Page 3 of 33 / Annex H6 Issued by: RWE Npower Renewables Ltd. Hayes McKenzie Partnership Ltd.
db(a) re: 10-12 W Octave Band Centre Frequency (Hz) Reference Wind Speed: m.s -1 L WA 63 1 2 0 1k 2k 4k 8k 11 105.4 89.3 97.9 100.4 99.0 97.5 94.2 87.3 79.7 12 105.4 89.3 97.9 100.4 99.0 97.5 94.2 87.3 79.7 Table H6.7 Source sound power levels assumed for Derwydd Bach 1.2MW restricted turbines db(a) re: 10-12 W Octave Band Centre Frequency (Hz) Reference Wind Speed: m.s -1 L WA 63 1 2 0 1k 2k 4k 8k 3 89.1 71.4 80.3 84.5 84.3 79.7 75.0 70.8 67.3 4 92.1 74.4 83.3 87.5 87.3 82.7 78.0 73.8 70.3 5 95.1 77.4 86.3 90.5 90.3 85.7 81.0 76.8 73.3 6 99.2 81.5 90.4 94.6 94.4 89.8 85.1 80.9 77.4 7 101.6 83.9 92.8 97.0 96.8 92.2 87.5 83.3 79.8 8 101.9 84.2 93.1 97.3 97.1 92.5 87.8 83.6 80.1 9 101.9 84.2 93.1 97.3 97.1 92.5 87.8 83.6 80.1 10 101.9 84.2 93.1 97.3 97.1 92.5 87.8 83.6 80.1 11 101.9 84.2 93.1 97.3 97.1 92.5 87.8 83.6 80.1 12 101.9 84.2 93.1 97.3 97.1 92.5 87.8 83.6 80.1 Predicted noise levels from the consented Nant Bach site have been based on the sound power levels of a generic 2MW wind turbine. The overall sound power level is 105.5 db(a) at 10 m.s -1. The corresponding source noise levels used in these assessments are shown in Table H6.8. Table H6.8 Source sound power levels assumed for Nant Bach turbines db(a) re: 10-12 W Octave Band Centre Frequency (Hz) Reference Wind Speed: m.s -1 L WA 63 1 2 0 1k 2k 4k 8k 3 94.2 75.7 83.4 87.3 88.6 87.3 86.5 81.4 67.2 4 97.1 78.6 86.3 90.2 91.5 90.2 89.4 84.3 70.1 5 100.9 82.4 90.1 94.0 95.3 94.0 93.2 88.1 73.9 6 103.1 84.6 92.3 96.2 97.5 96.2 95.4 90.3 76.1 7 103.8 85.3 93.0 96.9 98.2 96.9 96.1 91.0 76.8 8 104.0 85.5 93.2 97.1 98.4 97.1 96.3 91.2 77.0 9 104.5 86.0 93.7 97.6 98.9 97.6 96.8 91.7 77.5 10 105.5 87.0 94.7 98.6 99.9 98.6 97.8 92.7 78.5 11 106.5 88.0 95.7 99.6 100.9 99.6 98.8 93.7 79.5 12 106.4 87.9 95.6 99.5 100.8 99.5 98.7 93.6 79.4 For the purposes of a cumulative wind farm noise assessment, wind direction effects have been considered. This is in the form of an assumed additional attenuation value. The additional attenuation takes into account refraction effects for an upwind receptor position and source directivity variation for a crosswind receptor position. No additional attenuation is assumed for a downwind receptor position. Client: Page 4 of 33 / Annex H6 Issued by: RWE Npower Renewables Ltd. Hayes McKenzie Partnership Ltd.
For any given wind direction, each nearby property can be classified as being either downwind, crosswind, or upwind of each of the turbines. If the house is downwind (+/-75º) of the turbine no correction is required to the predicted turbine noise level. If it is crosswind (+/-º) of the turbine a 2dB reduction can be made to the predicted turbine noise level. This assumption is based on source directivity observations when a reduced noise output occurs in crosswind conditions. If the property is upwind of the turbine a reduction is made to the predicted turbine noise level due to shadow zone effects, which depend on distance and frequency. The additional attenuation due to a receptor being located in a shadow zone has been based on the scheme described in Hubbard & Shepherd 1990 (1). The scheme detailed in Hubbard & Shepherd 1990 is designed for flat, homogeneous terrain. As suggested by the Wyle Research Report (2), to take into account the hilly terrain that exists in this instance, half the excess shadow zone attenuation to that applicable for a flat terrain is assumed in the cumulative noise predictions below. In addition, the assumed excess shadow zone attenuation is further reduced for properties that lie in a partial upwind condition. Calculations have been carried out for wind directions in increments of º around the site for each site considered within the cumulative noise assessment. Once these corrections have been made, the overall noise level from all the turbines is calculated at each property for each wind direction. The cumulative noise predictions presented below represent the worst-case wind direction for each assessed property, for the most sensitive wind speed range. Predicted cumulative noise levels applicable for other wind directions are generally lower than those presented below. (1) Hubbard, H.H. & Shepherd, K.P. 1990. Wind Turbine Acoustics. NASA Technical Paper 57 DOE/NASA/3-77. (2) Wyle Research Report, WR 88-19. Measurement and evaluation of environmental noise from wind energy conversion systems in Alameda and Riverside Counties. Wyle Research October 1988. Client: Page 5 of 33 / Annex H6 Issued by: RWE Npower Renewables Ltd. Hayes McKenzie Partnership Ltd.
Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 270º) Receptor Location : Bron Bannog Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 180º) Receptor Location : Castell y Waen Cumulative Assessment Figure 1 Assessment at Bron Bannog Cumulative Assessment Figure 1 details the predicted cumulative L A90 noise levels for the receptor known as Bron Bannog, for a wind direction of 270º. For wind speeds 3-12 ms -1, predicted cumulative noise levels applicable for other wind directions are lower than those detailed in Cumulative Assessment Figure 1 above. The predicted noise levels indicate that the overall cumulative noise levels including the impact from the proposed wind farm, will meet the Upper Cumulative Assessment Figure 2 Assessment at Castell y Waen Cumulative Assessment Figure 2 details the predicted cumulative L A90 noise levels for the receptor known as Castell y Waen, for a wind direction of 180º. For wind speeds 3-12 ms -1, predicted cumulative noise levels applicable for other wind directions are lower than those detailed in Cumulative Assessment Figure 2 above. The predicted noise levels indicate that the overall cumulative noise levels including the impact from the proposed wind farm, will meet the Lower Client: Page 6 of 33 / Annex H6 Issued by:
Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 2º) Receptor Location : Cefn Bannog Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: º) Receptor Location : Cefn Rofft Cumulative Assessment Figure 3 Assessment at Cefn Bannog Cumulative Assessment Figure 3 details the predicted cumulative L A90 noise levels for the receptor known as Cefn Bannog, for a wind direction of 2º. For wind speeds 7-10 ms -1, predicted cumulative noise levels applicable for other wind directions are lower than those detailed in Cumulative Assessment Figure 3 above. For the wind speed ranges of 3-6 ms -1 and 11-12 ms -1, predicted cumulative noise levels applicable for other wind directions are no more than 0.5 db above those detailed in Cumulative Assessment Figure 3 above. The predicted noise levels indicate that the overall cumulative noise levels including the impact from the proposed wind farm, will meet the Upper Amenity Hours Noise Criterion proposed within ETSU-R-97. Cumulative Assessment Figure 4 Assessment at Cefn Rofft Cumulative Assessment Figure 4 details the predicted cumulative L A90 noise levels for the receptor known as Cefn Rofft, for a wind direction of º. For wind speeds 3-12 ms -1, predicted cumulative noise levels applicable for other wind directions are lower than those detailed in Cumulative Assessment Figure 4 levels including the impact from the proposed wind farm, will meet the Upper Client: Page 7 of 33 / Annex H6 Issued by:
Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 270º) Receptor Location : Crud-y-Gwynt Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 270º) Receptor Location : Cruglas Cumulative Assessment Figure 5 Assessment at Crud-y-Gwynt Cumulative Assessment Figure 5 details the predicted cumulative L A90 noise levels for the receptor known as Crud-y-Gwynt, for a wind direction of 270º. For wind speeds 3-12 ms -1, predicted cumulative noise levels applicable for other wind directions are lower than those detailed in Cumulative Assessment Figure 5 above. The predicted noise levels indicate that the overall cumulative noise levels including the impact from the proposed wind farm, will meet the Cumulative Assessment Figure 6 Assessment at Cruglas Cumulative Assessment Figure 6 details the predicted cumulative L A90 noise levels for the receptor known as Cruglas, for a wind direction of 270º. For wind speeds 3-12 ms -1, predicted cumulative noise levels applicable for other wind directions are lower than those detailed in Cumulative Assessment Figure 6 levels including the impact from the proposed wind farm, will meet the Upper Client: Page 8 of 33 / Annex H6 Issued by:
Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 2º) Receptor Location : Diffws Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 1º) Receptor Location : Hafod Caradoc Cumulative Assessment Figure 7 Assessment at Diffws Cumulative Assessment Figure 7 details the predicted cumulative L A90 noise levels for the receptor known as Diffws, for a wind direction of 2º. For wind speeds 5-12 ms -1, predicted cumulative noise levels applicable for other wind directions are lower than those detailed in Cumulative Assessment Figure 7 above. For wind speeds 3-4 ms -1, predicted cumulative noise levels applicable for other wind directions are no more than 0.1dB higher than those detailed in Cumulative Assessment Figure 7 above. The predicted noise levels indicate that the overall cumulative noise levels including the impact from the proposed wind farm, will meet the Amenity Hours Noise Criterion proposed within ETSU-R-97. Cumulative Assessment Figure 8 Assessment at Hafod Caradoc Cumulative Assessment Figure 8 details the predicted cumulative L A90 noise levels for the receptor known as Hafod Caradoc, for a wind direction of 1º. For wind speeds 3-12 ms -1, predicted cumulative noise levels applicable for other wind directions are lower than those detailed in Cumulative Assessment Figure 8 above. The predicted noise levels indicate that the overall cumulative noise levels including the impact from the proposed wind farm, will meet the Upper Client: Page 9 of 33 / Annex H6 Issued by:
Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 2º) Receptor Location : Hafod Ty Ddu Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 90º) Receptor Location : Hafotty Newydd Cumulative Assessment Figure 9 Assessment at Hafod Ty Ddu Cumulative Assessment Figure 9 details the predicted cumulative L A90 noise levels for the receptor known as Hafod Ty Ddu, for a wind direction of 2º. For wind speeds 3-12 ms -1, predicted cumulative noise levels applicable for other wind directions are lower than those detailed in Cumulative Assessment Figure 9 above. The predicted noise levels indicate that the overall cumulative noise levels including the impact from the proposed wind farm, will meet the noise criterion proposed within ETSU-R-97, for an associated dwelling. Cumulative Assessment Figure 10 Assessment at Hafotty Newydd Cumulative Assessment Figure 10 details the predicted cumulative L A90 noise levels for the receptor known as Hafotty Newydd, for a wind direction of 90º. For wind speeds 8-10 ms -1, predicted cumulative noise levels applicable for other wind directions are lower than those detailed in Cumulative Assessment Figure 10 above. For the wind speed ranges of 3-7 ms -1 and 11-12 ms -1, predicted cumulative noise levels applicable for other wind directions are no more than 0.6dB higher than those detailed in Cumulative Assessment Figure 10 levels including the impact from the proposed wind farm, will meet the Upper Client: Page 10 of 33 / Annex H6 Issued by:
Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 2º) Receptor Location : Plas Nant Glyn Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 90º) Receptor Location : Tai'n-y-Waens Cumulative Assessment Figure 11 Assessment at Plas Nant Glyn Cumulative Assessment Figure 11 details the predicted cumulative L A90 noise levels for the receptor known as Plas Nant Glyn, for a wind direction of 2º. For wind speeds 3-12 ms -1, predicted cumulative noise levels applicable for other wind directions are lower than those detailed in Cumulative Assessment Figure 11 above. The predicted noise levels indicate that the overall cumulative noise levels including the impact from the proposed wind farm, will meet the Lower Cumulative Assessment Figure 12 Assessment at Tai n-y-waens Cumulative Assessment Figure 12 details the predicted cumulative L A90 noise levels for the receptor known as Tai n-y-waens, for a wind direction of 90º. For wind speeds 3-12 ms -1, predicted cumulative noise levels applicable for other wind directions are lower than those detailed in Cumulative Assessment Figure 12 above. The predicted noise levels indicate that the overall cumulative noise levels including the impact from the proposed wind farm, will meet the Upper Client: Page 11 of 33 / Annex H6 Issued by:
Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 90º) Receptor Location : Tal-y-cefn Uchaf Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 270º) Receptor Location : Trawsnant Cumulative Assessment Figure 13 Assessment at Tal-y-cefn Uchaf Cumulative Assessment Figure 13 details the predicted cumulative L A90 noise levels for the receptor known as Tal-y-cefn Uchaf, for a wind direction of 90º. For wind speeds 4-12 ms -1, predicted cumulative noise levels applicable for other wind directions are lower than those detailed in Cumulative Assessment Figure 13 above. For a wind speed of 3 ms -1, predicted cumulative noise levels applicable for other wind directions are no more than 0.1dB higher than those detailed in Cumulative Assessment Figure 13 above. The predicted noise levels indicate that the overall cumulative noise levels including the impact from the proposed wind farm, will meet the Upper Amenity Hours Noise Criterion proposed within ETSU-R-97. Cumulative Assessment Figure 14 Assessment at Trawsnant Cumulative Assessment Figure 14 details the predicted cumulative L A90 noise levels for the receptor known as Trawsnant, for a wind direction of 270º. For wind speeds 3-12 ms -1, predicted cumulative noise levels applicable for other wind directions are lower than those detailed in Cumulative Assessment Figure 14 levels including the impact from the proposed wind farm, will meet the Upper Client: Page 12 of 33 / Annex H6 Issued by:
Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 2º) Receptor Location : H1 (Trawsnant Background Noise Levels) Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 2º) Receptor Location : H3 (Trawsnant Background Noise Levels) Cumulative Assessment Figure Assessment at H1 Cumulative Assessment Figure details the predicted cumulative L A90 noise levels for the receptor known as H1, for a wind direction of 2º. For wind directions are lower than those detailed in Cumulative Assessment Figure levels including the impact from the proposed wind farm, will meet the Upper Cumulative Assessment Figure 16 Assessment at H3 Cumulative Assessment Figure 16 details the predicted cumulative L A90 noise levels for the receptor known as H3, for a wind direction of 2º. For wind directions are lower than those detailed in Cumulative Assessment Figure 16 Client: Page 13 of 33 / Annex H6 Issued by:
Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 2º) Receptor Location : H4 (Trawsnant Background Noise Levels) Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 2º) Receptor Location : H10 (Trawsnant Background Noise Levels) Cumulative Assessment Figure 17 Assessment at H4 Cumulative Assessment Figure 17 details the predicted cumulative L A90 noise levels for the receptor known as H4, for a wind direction of 2º. For wind directions are lower than those detailed in Cumulative Assessment Figure 17 Cumulative Assessment Figure 18 Assessment at H10 Cumulative Assessment Figure 18 details the predicted cumulative L A90 noise levels for the receptor known as H10, for a wind direction of 2º. For wind directions are lower than those detailed in Cumulative Assessment Figure 18 Client: Page 14 of 33 / Annex H6 Issued by:
Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 270º) Receptor Location : H22 (Trawsnant Background Noise Levels) Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 270º) Receptor Location : H23 (Trawsnant Background Noise Levels) Cumulative Assessment Figure 19 Assessment at H22 Cumulative Assessment Figure 19 details the predicted cumulative L A90 noise levels for the receptor known as H22, for a wind direction of 270º. For wind directions are lower than those detailed in Cumulative Assessment Figure 19 Cumulative Assessment Figure Assessment at H23 Cumulative Assessment Figure details the predicted cumulative L A90 noise levels for the receptor known as H23, for a wind direction of 270º. For wind directions are lower than those detailed in Cumulative Assessment Figure Client: Page of 33 / Annex H6 Issued by:
Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 270º) Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 270º) Receptor Location : H31 (Trawsnant Background Noise Levels) Receptor Location : H33 (Trawsnant Background Noise Levels) Cumulative Assessment Figure 21 Assessment at H31 Cumulative Assessment Figure 21 details the predicted cumulative L A90 noise levels for the receptor known as H31, for a wind direction of 270º. For wind directions are lower than those detailed in Cumulative Assessment Figure 21 levels including the impact from the proposed wind farm, will meet the Upper Cumulative Assessment Figure 22 Assessment at H33 Cumulative Assessment Figure 22 details the predicted cumulative L A90 noise levels for the receptor known as H33, for a wind direction of 270º. For wind directions are lower than those detailed in Cumulative Assessment Figure 22 Client: Page 16 of 33 / Annex H6 Issued by:
Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 270º) Receptor Location : H34 (Trawsnant Background Noise Levels) Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 270º) Receptor Location : H (Crud-y-Gwynt Background Noise Levels) Cumulative Assessment Figure 23 Assessment at H34 Cumulative Assessment Figure 23 details the predicted cumulative L A90 noise levels for the receptor known as H34, for a wind direction of 270º. For wind directions are lower than those detailed in Cumulative Assessment Figure 23 Cumulative Assessment Figure 24 Assessment at H Cumulative Assessment Figure 24 details the predicted cumulative L A90 noise levels for the receptor known as H, for a wind direction of 270º. For wind directions are lower than those detailed in Cumulative Assessment Figure 24 Client: Page 17 of 33 / Annex H6 Issued by:
Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 270º) Receptor Location : H37 (Cruglas Background Noise Levels) Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 270º) Receptor Location : H38 (Cruglas Background Noise Levels) Cumulative Assessment Figure Assessment at H37 Cumulative Assessment Figure details the predicted cumulative L A90 noise levels for the receptor known as H37, for a wind direction of 270º. For wind directions are lower than those detailed in Cumulative Assessment Figure Cumulative Assessment Figure 26 Assessment at H38 Cumulative Assessment Figure 26 details the predicted cumulative L A90 noise levels for the receptor known as H38, for a wind direction of 270º. For wind directions are lower than those detailed in Cumulative Assessment Figure 26 Client: Page 18 of 33 / Annex H6 Issued by:
Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 270º) Receptor Location : H39 (Cruglas Background Noise Levels) Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 270º) Receptor Location : H44 (Bron Bannog Background Noise Levels) Cumulative Assessment Figure 27 Assessment at H39 Cumulative Assessment Figure 27 details the predicted cumulative L A90 noise levels for the receptor known as H39, for a wind direction of 270º. For wind directions are lower than those detailed in Cumulative Assessment Figure 27 Cumulative Assessment Figure 28 Assessment at H44 Cumulative Assessment Figure 28 details the predicted cumulative L A90 noise levels for the receptor known as H44, for a wind direction of 270º. For wind directions are lower than those detailed in Cumulative Assessment Figure 28 Client: Page 19 of 33 / Annex H6 Issued by:
Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 270º) Receptor Location : H46 (Bron Bannog Background Noise Levels) Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 270º) Receptor Location : H47 (Bron Bannog Background Noise Levels) Cumulative Assessment Figure 29 Assessment at H46 Cumulative Assessment Figure 29 details the predicted cumulative L A90 noise levels for the receptor known as H46, for a wind direction of 270º. For wind directions are lower than those detailed in Cumulative Assessment Figure 29 Cumulative Assessment Figure Assessment at H47 Cumulative Assessment Figure details the predicted cumulative L A90 noise levels for the receptor known as H47, for a wind direction of 270º. For wind directions are lower than those detailed in Cumulative Assessment Figure Client: Page of 33 / Annex H6 Issued by:
Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 2º) Receptor Location : H53 (Cefn Bannog Background Noise Levels) Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 2º) Receptor Location : H54 (Cefn Bannog Background Noise Levels) Cumulative Assessment Figure 31 Assessment at H53 Cumulative Assessment Figure 31 details the predicted cumulative L A90 noise levels for the receptor known as H53, for a wind direction of 2º. For wind directions are lower than those detailed in Cumulative Assessment Figure 31 levels including the impact from the proposed wind farm, will meet the Upper Cumulative Assessment Figure 32 Assessment at H54 Cumulative Assessment Figure 32 details the predicted cumulative L A90 noise levels for the receptor known as H54, for a wind direction of 2º. For wind speeds 6-12 ms -1, predicted cumulative noise levels applicable for other wind directions are lower than those detailed in Cumulative Assessment Figure 32 above. For wind speeds 3-5 ms -1, predicted cumulative noise levels applicable for other wind directions are no more than 0.1dB higher than those detailed in Cumulative Assessment Figure 32 above. The predicted noise levels indicate that the overall cumulative noise levels including the impact from the proposed wind farm, will meet the Upper Amenity Hours Noise Criterion proposed within ETSU-R-97. Client: Page 21 of 33 / Annex H6 Issued by:
Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 2º) Receptor Location : H (Cefn Bannog Background Noise Levels) Clocaenog W.F. Cumulative Noise Assessment (Wind Dir.: 2º) Receptor Location : H56 Noise Limit agreed by Denbighshire C.C. for Derwydd Bach W.F. Wind Speed @ 10 m agl (m.s -1 ) Cumulative Assessment Figure 33 Assessment at H Cumulative Assessment Figure 33 details the predicted cumulative L A90 noise levels for the receptor known as H, for a wind direction of 2º. For wind speeds 8-12 ms -1, predicted cumulative noise levels applicable for other wind directions are lower than those detailed in Cumulative Assessment Figure 33 above. For wind speeds 3-7 ms -1, predicted cumulative noise levels applicable for other wind directions are no more than 0.6dB higher than those detailed in Cumulative Assessment Figure 33 above. The predicted noise levels indicate that the overall cumulative noise levels including the impact from the proposed wind farm, will meet the Upper Amenity Hours Noise Criterion proposed within ETSU-R-97. Cumulative Assessment Figure 34 Assessment at H56 Cumulative Assessment Figure 34 details the predicted cumulative L A90 noise levels for the receptor known as H56, for a wind direction of 2º. For wind speeds 6-12 ms -1, predicted cumulative noise levels applicable for other wind directions are lower than those detailed in Cumulative Assessment Figure 34 above. For wind speeds 3-5 ms -1, predicted cumulative noise levels applicable for other wind directions are no more than 0.2dB higher than those detailed in Cumulative Assessment Figure 34 above. Predicted cumulative noise levels are presented against the noise criterion agreed for this property by Denbighshire County Council for the Derwydd Bach Wind Farm. The predicted noise levels indicate that the overall cumulative noise levels including the impact from the proposed wind farm, are likely to meet the noise criterion agreed by Denbighshire County Council for the Derwydd Bach Wind Farm. Client: Page 22 of 33 / Annex H6 Issued by:
Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 270º) Receptor Location : H57 (Bron Bannog Background Noise Levels) Clocaenog W.F. Cumulative Noise Assessment (Wind Dir.: 90º) Receptor Location : H109 Noise Limit agreed by Denbighshire C.C. for Derwydd Bach W.F. Wind Speed @ 10 m agl (m.s -1 ) Cumulative Assessment Figure Assessment at H57 Cumulative Assessment Figure details the predicted cumulative L A90 noise levels for the receptor known as H57, for a wind direction of 270º. For wind directions are lower than those detailed in Cumulative Assessment Figure Cumulative Assessment Figure 36 Assessment at H109 Cumulative Assessment Figure 36 details the predicted cumulative L A90 noise levels for the receptor known as H109, for a wind direction of 90º. For wind directions are lower than those detailed in Cumulative Assessment Figure 36 above. Predicted cumulative noise levels are presented against the noise criterion agreed for this property by Denbighshire County Council for the Derwydd Bach Wind Farm. The predicted noise levels indicate that the overall cumulative noise levels including the impact from the proposed wind farm, are likely to meet the noise criterion agreed by Denbighshire County Council for the Derwydd Bach Wind Farm. Client: Page 23 of 33 / Annex H6 Issued by:
Clocaenog W.F. Cumulative Noise Assessment (Wind Dir.: 1º) Receptor Location : H110 Noise Limit agreed by Denbighshire C.C. for Derwydd Bach W.F. Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 90º) Receptor Location : H111 (Cefn Rofft Background Noise Levels) Wind Speed @ 10 m agl (m.s -1 ) Cumulative Assessment Figure 37 Assessment at H110 Cumulative Assessment Figure 37 details the predicted cumulative L A90 noise levels for the receptor known as H110, for a wind direction of 1º. For wind speeds 6-12 ms -1, predicted cumulative noise levels applicable for other wind directions are lower than those detailed in Cumulative Assessment Figure 37 above. For wind speeds 3-5 ms -1, predicted cumulative noise levels applicable for other wind directions are no more than 0.4dB higher than those detailed in Cumulative Assessment Figure 37 above. Predicted cumulative noise levels are presented against the noise criterion agreed for this property by Denbighshire County Council for the Derwydd Bach Wind Farm. The predicted noise levels indicate that the overall cumulative noise levels including the impact from the proposed wind farm, are likely to meet the noise criterion agreed by Denbighshire County Council for the Derwydd Bach Wind Farm. Cumulative Assessment Figure 38 Assessment at H111 Cumulative Assessment Figure 38 details the predicted cumulative L A90 noise levels for the receptor known as H111, for a wind direction of 90º. For wind speeds 6-12 ms -1, predicted cumulative noise levels applicable for other wind directions are lower than those detailed in Cumulative Assessment Figure 38 above. For wind speeds 3-5 ms -1, predicted cumulative noise levels applicable for other wind directions are no more than 0.1dB higher than those detailed in Cumulative Assessment Figure 38 above. The predicted noise levels indicate that the overall cumulative noise levels including the impact from the proposed wind farm, will meet the Upper Amenity Hours Noise Criterion proposed within ETSU-R-97. Client: Page 24 of 33 / Annex H6 Issued by:
Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: º) Receptor Location : H112 (Cefn Rofft Background Noise Levels) Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: º) Receptor Location : H114 (Cefn Rofft Background Noise Levels) Cumulative Assessment Figure 39 Assessment at H112 Cumulative Assessment Figure 39 details the predicted cumulative L A90 noise levels for the receptor known as H112, for a wind direction of º. For wind speeds 3-10 ms -1, predicted cumulative noise levels applicable for other wind directions are lower than those detailed in Cumulative Assessment Figure 39 above. For wind speeds 11-12 ms -1, predicted cumulative noise levels applicable for other wind directions are no more than 0.1dB higher than those detailed in Cumulative Assessment Figure 39 above. The predicted noise levels indicate that the overall cumulative noise levels including the impact from the proposed wind farm, will meet the Upper Amenity Hours Noise Criterion proposed within ETSU-R-97. Cumulative Assessment Figure Assessment at H114 Cumulative Assessment Figure details the predicted cumulative L A90 noise levels for the receptor known as H114, for a wind direction of º. For wind speeds 6-10 ms -1, predicted cumulative noise levels applicable for other wind directions are lower than those detailed in Cumulative Assessment Figure above. For the wind speed ranges of 3-5 ms -1 and 11-12 ms -1, predicted cumulative noise levels applicable for other wind directions are no more than 0.3dB higher than those detailed in Cumulative Assessment Figure above. The predicted noise levels indicate that the overall cumulative noise levels including the impact from the proposed wind farm, will meet the Lower Client: Page of 33 / Annex H6 Issued by:
Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 1º) Receptor Location : H1 (Cefn Rofft Background Noise Levels) Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 90º) Receptor Location : H116 (Cefn Rofft Background Noise Levels) Cumulative Assessment Figure 41 Assessment at H1 Cumulative Assessment Figure 41 details the predicted cumulative L A90 noise levels for the receptor known as H1, for a wind direction of 1º. For wind speeds 6-12 ms -1, predicted cumulative noise levels applicable for other wind directions are lower than those detailed in Cumulative Assessment Figure 41 above. For wind speeds 3-5 ms -1, predicted cumulative noise levels applicable for other wind directions are no more than 0.3dB higher than those detailed in Cumulative Assessment Figure 41 above. The predicted noise levels indicate that the overall cumulative noise levels including the impact from the proposed wind farm, will meet the Lower Amenity Hours Noise Criterion proposed within ETSU-R-97. Cumulative Assessment Figure 42 Assessment at H116 Cumulative Assessment Figure 42 details the predicted cumulative L A90 noise levels for the receptor known as H116, for a wind direction of 90º. For wind directions are lower than those detailed in Cumulative Assessment Figure 42 Client: Page 26 of 33 / Annex H6 Issued by:
Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 1º) Receptor Location : H117 (Cefn Rofft Background Noise Levels) Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 1º) Receptor Location : H118 (Cefn Rofft Background Noise Levels) Cumulative Assessment Figure 43 Assessment at H117 Cumulative Assessment Figure 43 details the predicted cumulative L A90 noise levels for the receptor known as H117, for a wind direction of 1º. For wind directions are lower than those detailed in Cumulative Assessment Figure 43 Cumulative Assessment Figure 44 Assessment at H118 Cumulative Assessment Figure 44 details the predicted cumulative L A90 noise levels for the receptor known as H118, for a wind direction of 1º. For wind directions are lower than those detailed in Cumulative Assessment Figure 44 Client: Page 27 of 33 / Annex H6 Issued by:
Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 90º) Receptor Location : H131 (Cefn Rofft Background Noise Levels) Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 90º) Receptor Location : H1 (Tai'n-y-Waens Background Noise Levels) Cumulative Assessment Figure Assessment at H131 Cumulative Assessment Figure details the predicted cumulative L A90 noise levels for the receptor known as H131, for a wind direction of 90º. For wind directions are lower than those detailed in Cumulative Assessment Figure Cumulative Assessment Figure 46 Assessment at H1 Cumulative Assessment Figure 46 details the predicted cumulative L A90 noise levels for the receptor known as H1, for a wind direction of 90º. For wind directions are lower than those detailed in Cumulative Assessment Figure 46 Client: Page 28 of 33 / Annex H6 Issued by:
Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 90º) Receptor Location : H136 (Tai'n-y-Waens Background Noise Levels) Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 90º) Receptor Location : H138 (Tai'n-y-Waens Background Noise Levels) Cumulative Assessment Figure 47 Assessment at H136 Cumulative Assessment Figure 47 details the predicted cumulative L A90 noise levels for the receptor known as H136, for a wind direction of 90º. For wind directions are lower than those detailed in Cumulative Assessment Figure 47 levels including the impact from the proposed wind farm, will meet the Upper Cumulative Assessment Figure 48 Assessment at H138 Cumulative Assessment Figure 48 details the predicted cumulative L A90 noise levels for the receptor known as H138, for a wind direction of 90º. For wind directions are lower than those detailed in Cumulative Assessment Figure 48 Client: Page 29 of 33 / Annex H6 Issued by:
Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 90º) Receptor Location : H1 (Tal-y-cefn Uchaf Background Noise Levels) Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: º) Receptor Location : H7 (Hafotty Newydd Background Noise Levels) Cumulative Assessment Figure 49 Assessment at H1 Cumulative Assessment Figure 49 details the predicted cumulative L A90 noise levels for the receptor known as H1, for a wind direction of 90º. For wind directions are lower than those detailed in Cumulative Assessment Figure 49 Cumulative Assessment Figure Assessment at H7 Cumulative Assessment Figure details the predicted cumulative L A90 noise levels for the receptor known as H7, for a wind direction of º. For wind directions are lower than those detailed in Cumulative Assessment Figure Client: Page of 33 / Annex H6 Issued by:
Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 90º) Receptor Location : H9 (Hafotty Newydd Background Noise Levels) Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 180º) Receptor Location : H168 (Hafod Caradoc Background Noise Levels) Cumulative Assessment Figure 51 Assessment at H9 Cumulative Assessment Figure 51 details the predicted cumulative L A90 noise levels for the receptor known as H9, for a wind direction of 90º. For wind speeds 6-9 ms -1, predicted cumulative noise levels applicable for other wind directions are lower than those detailed in Cumulative Assessment Figure 51 above. For the wind speed ranges of 3-5 ms -1 and 10-12 ms -1, predicted cumulative noise levels applicable for other wind directions are no more than 0.2dB higher than those detailed in Cumulative Assessment Figure 51 above. The predicted noise levels indicate that the overall cumulative noise levels including the impact from the proposed wind farm, will meet the Upper Cumulative Assessment Figure 52 Assessment at H168 Cumulative Assessment Figure 52 details the predicted cumulative L A90 noise levels for the receptor known as H168, for a wind direction of 180º. For wind directions are lower than those detailed in Cumulative Assessment Figure 52 levels including the impact from the proposed wind farm, will meet the Upper Client: Page 31 of 33 / Annex H6 Issued by:
Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 180º) Receptor Location : H171 (Hafod Caradoc Background Noise Levels) Associated Dwelling Noise Criterion : ETSU-R-97 Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 180º) Receptor Location : H180 (Hafod Caradoc Background Noise Levels) Associated Dwelling Noise Criterion : ETSU-R-97 Cumulative Assessment Figure 53 Assessment at H171 Cumulative Assessment Figure 53 details the predicted cumulative L A90 noise levels for the receptor known as H171, for a wind direction of 180º. For wind directions are lower than those detailed in Cumulative Assessment Figure 53 levels including the impact from the proposed wind farm, will meet the noise criterion proposed within ETSU-R-97 for an associated dwelling. Cumulative Assessment Figure 54 Assessment at H180 Cumulative Assessment Figure 54 details the predicted cumulative L A90 noise levels for the receptor known as H180, for a wind direction of 180º. For wind directions are lower than those detailed in Cumulative Assessment Figure 54 levels including the impact from the proposed wind farm, will meet the noise criterion proposed within ETSU-R-97 for an associated dwelling. Client: Page 32 of 33 / Annex H6 Issued by:
Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 2º) Receptor Location : H184 (Trawsnant Background Noise Levels) Associated Dwelling Noise Criterion : ETSU-R-97 Clocaenog W.F. Cumulative Noise Assessment : Amenity (Wind Dir.: 90º) Receptor Location : H7 (Cefn Rofft Background Noise Levels) Cumulative Assessment Figure Assessment at H184 Cumulative Assessment Figure details the predicted cumulative L A90 noise levels for the receptor known as H184, for a wind direction of 2º. For wind directions are lower than those detailed in Cumulative Assessment Figure Cumulative Assessment Figure 56 Assessment at H7 Cumulative Assessment Figure 56 details the predicted cumulative L A90 noise levels for the receptor known as H7, for a wind direction of 90º. For wind directions are lower than those detailed in Cumulative Assessment Figure 56 Client: Page 33 of 33 / Annex H6 Issued by: