Appendix C Updated Noise Impact Assessment Memo
3862 Clifton Manor Place Haymarket, Virginia 20169 USA 703-753-1602 (O) 703-753-1522 (F) www.hesslernoise.com
January 27, 2016
Mr. John Hecklau Environmental Design and Research 217 Montgomery Street Suite 1000 Syracuse, NY 13202 Reference:
L-2015-011116-A
Subject:
Jericho Rise Wind Farm Noise Impact Assessment Updated Sound Contour Plots
Dear Mr. Hecklau: We have received the latest site plans, as of January 27, 2016, for the Jericho Rise Wind Farm Project and have updated the noise model to reflect the current layout. The most significant change involves the elimination of the six alternate units that were included, for conservatism, in all previous model iterations and that are still mentioned in latest assessment report (HAI Report 2015-062515-B, dated October 23rd, 2015). The alternate turbine locations were simply place holders in the event a turbine was moved from another location to one of the alternate spots. In the current model the sound contours and nominal impact thresholds for each design case are considerably contracted in the southwestern corner of the project area where 5 of the 6 alternate locations were. Obviously, the anticipated noise impact in that area is considerably reduced by the removal of the alternate units. Although some of the other units moved slightly, none of the shifts has significantly changed the sound level at any residence; consequently, the expected noise impact described in the assessment report for the ‘conservative” and “typical” design cases remains the same along with all of our general conclusions. In addition, the updated layout continues to demonstrate compliance with the local noise limit of 50 dBA at all non-participating residences. This letter may be considered an addendum to Report 2015-062515-B.
NOISE CONTROL ENGINEERING FOR POWER GENERATION AND INDUSTRIAL FACILITIES
1
Of course, let me know if you have any questions or need any further information. Sincerely,
David M. Hessler, P.E., INCE Principal Consultant Hessler Associates, Inc. Attachments:
Plot 1 – “Conservative” Impact Threshold, Revised 1/27/16 Plot 2 – “Typical” Impact Threshold, Revised 1/27/16 Plot 3 – 50 dBA Contour, Revised 1/27/16
NOISE CONTROL ENGINEERING FOR POWER GENERATION AND INDUSTRIAL FACILITIES
2
dBA Values: 40
50 dBA or Higher 45-50 dBA 40
40-45 dBA
44
45
45 40 45
50
40
45
50
45
Substation 45
45
40 45
45 50 40 50
50
45
45
45
45
45 45
50
45
50
40 40
50 45
1 Mile
0 Description:
Project:
Jericho Rise Prepared for:
EDR Date:
Drawing #:
January 27, 2016 JR-Rev-H-1-1-1
Legend:
Plot 1
Turbine Location
Predicted Sound Contours (dBA) Plotted to "Conservative" Impact Threshold of 40 dBA. All Units Operating Under 6 m/s Wind Conditions.
Non-Participating Residence
3862 Clifton Manor Place, Suite B Haymarket VA, 20169 www.hesslernoise.com (703) 753-2291 (703) 753-1602
dBA Values: 46
50 dBA or Higher 46-50 dBA
46 45
46 50
46 46
50
46 50
50 46
46
46
Substation
46
46
46
46 50
46 46
46 46
46
50 46
46 46
46
50 46
46 46
50 50
50 46
46
0 Description:
Project:
Jericho Rise Prepared for:
EDR Date:
January 27, 2016
Drawing #:
JR-Rev-H-1-2-1
1 Mile Legend:
Plot 2
Turbine Location
Predicted Sound Contours (dBA) Plotted to "Typical" Impact Threshold of 46 dBA. All Units Operating Under 6 m/s Wind Conditions.
Non-Participating Residence
3862 Clifton Manor Place, Suite B Haymarket VA, 20169 www.hesslernoise.com (703) 753-2291 (703) 753-1602
dBA Values:
50 dBA or Higher
50
50
50 50
50 49
50 50
Substation
50
50 50
50
50
50 50
50
1 Mile
0 Description:
Project:
Jericho Rise Prepared for:
EDR Date:
January 27, 2016
Drawing #:
JR-Rev-H-1-3
Legend:
Plot 3
Turbine Location
Predicted Sound Contours (dBA) Plotted to Local Regulatory Limit of 50 dBA. All Units Operating Under 7 m/s Wind Conditions.
Non-Participating Residence
3862 Clifton Manor Place, Suite B Haymarket VA, 20169 www.hesslernoise.com (703) 753-2291 (703) 753-1602
January 27, 2016
Mr. John Hecklau Environmental Design and Research 217 Montgomery Street Suite 1000 Syracuse, NY 13202 Reference:
L-2015-011116-A
Subject:
Jericho Rise Wind Farm Noise Impact Assessment Updated Sound Contour Plots
Dear Mr. Hecklau: We have received the latest site plans, as of January 27, 2016, for the Jericho Rise Wind Farm Project and have updated the noise model to reflect the current layout. The most significant change involves the elimination of the six alternate units that were included, for conservatism, in all previous model iterations and that are still mentioned in latest assessment report (HAI Report 2015-062515-B, dated October 23rd, 2015). The alternate turbine locations were simply place holders in the event a turbine was moved from another location to one of the alternate spots. In the current model the sound contours and nominal impact thresholds for each design case are considerably contracted in the southwestern corner of the project area where 5 of the 6 alternate locations were. Obviously, the anticipated noise impact in that area is considerably reduced by the removal of the alternate units. Although some of the other units moved slightly, none of the shifts has significantly changed the sound level at any residence; consequently, the expected noise impact described in the assessment report for the ‘conservative” and “typical” design cases remains the same along with all of our general conclusions. In addition, the updated layout continues to demonstrate compliance with the local noise limit of 50 dBA at all non-participating residences. This letter may be considered an addendum to Report 2015-062515-B.
NOISE CONTROL ENGINEERING FOR POWER GENERATION AND INDUSTRIAL FACILITIES
1
Of course, let me know if you have any questions or need any further information. Sincerely,
David M. Hessler, P.E., INCE Principal Consultant Hessler Associates, Inc. Attachments:
Plot 1 – “Conservative” Impact Threshold, Revised 1/27/16 Plot 2 – “Typical” Impact Threshold, Revised 1/27/16 Plot 3 – 50 dBA Contour, Revised 1/27/16
NOISE CONTROL ENGINEERING FOR POWER GENERATION AND INDUSTRIAL FACILITIES
2
dBA Values: 40
50 dBA or Higher 45-50 dBA 40
40-45 dBA
44
45
45 40 45
50
40
45
50
45
Substation 45
45
40 45
45 50 40 50
50
45
45
45
45
45 45
50
45
50
40 40
50 45
1 Mile
0 Description:
Project:
Jericho Rise Prepared for:
EDR Date:
Drawing #:
January 27, 2016 JR-Rev-H-1-1-1
Legend:
Plot 1
Turbine Location
Predicted Sound Contours (dBA) Plotted to "Conservative" Impact Threshold of 40 dBA. All Units Operating Under 6 m/s Wind Conditions.
Non-Participating Residence
3862 Clifton Manor Place, Suite B Haymarket VA, 20169 www.hesslernoise.com (703) 753-2291 (703) 753-1602
dBA Values: 46
50 dBA or Higher 46-50 dBA
46 45
46 50
46 46
50
46 50
50 46
46
46
Substation
46
46
46
46 50
46 46
46 46
46
50 46
46 46
46
50 46
46 46
50 50
50 46
46
0 Description:
Project:
Jericho Rise Prepared for:
EDR Date:
January 27, 2016
Drawing #:
JR-Rev-H-1-2-1
1 Mile Legend:
Plot 2
Turbine Location
Predicted Sound Contours (dBA) Plotted to "Typical" Impact Threshold of 46 dBA. All Units Operating Under 6 m/s Wind Conditions.
Non-Participating Residence
3862 Clifton Manor Place, Suite B Haymarket VA, 20169 www.hesslernoise.com (703) 753-2291 (703) 753-1602
dBA Values:
50 dBA or Higher
50
50
50 50
50 49
50 50
Substation
50
50 50
50
50
50 50
50
1 Mile
0 Description:
Project:
Jericho Rise Prepared for:
EDR Date:
January 27, 2016
Drawing #:
JR-Rev-H-1-3
Legend:
Plot 3
Turbine Location
Predicted Sound Contours (dBA) Plotted to Local Regulatory Limit of 50 dBA. All Units Operating Under 7 m/s Wind Conditions.
Non-Participating Residence
3862 Clifton Manor Place, Suite B Haymarket VA, 20169 www.hesslernoise.com (703) 753-2291 (703) 753-1602
