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Appendix C Pre-Construction Sound Monitoring Study

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Appendix C Pre-Construction Sound Monitoring Study Appendix C Pre-Construction Sound Monitoring Study Nobles 2 Wind Project Nobles County, Minnesota NOBLES 2 WIND FARM Nobles County, Minnesota PRE-CONSTRUCTION NOISE MONITORING STUDY Prepared for Westwood Professional Services, Inc. by David Braslau Associates, Inc. 14 April 2016 Westwood Professional Services, Inc. Nobles 2 – Pre-Construction Noise Monitoring EXECUTIVE SUMMARY Sound level monitoring was performed at four residential locations within the Nobles 2 Wind Farm boundary in Nobles County, Minnesota. Sound level readings were taken every second for four full days between 9 March and 13 March 2016. Readings were taken with Larson-Davis Model 831 sound level meters located within 100 to 200 feet of homes on the residential properties. Average energy equivalent sound levels (Leq) and statistical sound levels including the L50 (level exceeded 50% of an hour) were automatically calculated and stored by each meter each hour of the monitoring period Meteorological data were collected by weather stations at two of the meters. A comparison of wind speeds with reported hourly data at Worthington airport showed similar variations in wind speeds. A moderated relationship between sound level and wind speed was found. Regional average Leq and L50 were estimated from the data that were not strongly affected by local traffic flow, since most residences are not located close to busy roadways. The resulting regional average sound levels are presented in the table below. Metric Daytime Nighttime Leq 43 35 L50 37 32 David Braslau Associates, Inc. Westwood Professional Services, Inc. Nobles 2 – Pre-Construction Noise Monitoring Table of Contents 1.0 INTRODUCTION............................................................................................................. 1 1.1. Study Description............................................................................................................ 1 1.2. Study Objectives ............................................................................................................. 1 1.3. Meteorological Conditions.............................................................................................. 2 2.0 AVERAGE ENERGY LEQ RESULTS .......................................................................... 7 2.1. Hourly Leq ......................................................................................................................7 2.2. Leq versus Wind Speed................................................................................................... 7 2.3. Overall Average Leq ....................................................................................................... 7 3.0 AVERAGE L50 RESULTS ............................................................................................ 14 4.0 SUMMRY OF FINDINGS ............................................................................................. 18 APPENDIX A MONITOR SITES ON AERIAL PHOTOGRAPHS APPENDIX B PHOTOGRAPHS OF METER LOCATIONS David Braslau Associates, Inc. Westwood Professional Services, Inc. Nobles 2 – Pre-Construction Noise Monitoring List of Figures Figure 1.1 Location Homes and Sound Monitors within the Nobles 2 Boundary............. 3 Figure 1.2 Location of Monitoring Sites Between Weather Stations.................................. 4 Figure 1.3 Wind Speed During Monitoring Period.............................................................. 5 Figure 1.4 Hourly Temperature During Monitoring Period............................................... 6 Figure 2.1 Hourly Leq Data – All Meters –Day and Night Periods.................................... 8 Figure 2.2 Meter 1 Hourly Leq and Wind Speed ................................................................ 9 Figure 2.3 M1 Leq versus M1 Wind Speed ......................................................................... 10 Figure 2.4 Daytime Average Leq Levels.............................................................................. 11 Figure 2.5 Nighttime Average Leq Levels ........................................................................... 12 Figure 2.6 Calculation of Daytime and Nighttime Leq...................................................... 13 Figure 3.1 Average Daytime L50 Level with No Wind and Wind .................................... 15 Figure 3.2 Average Nighttime L50 Nighttime Levels with No Wind and Wind.............. 16 Figure 3.3 Calculation of Daytime and Nighttime L50 ...................................................... 17 List of Tables Table 1.1 Minnesota Noise Standards (Mn. Rules 7070.0040)........................................... 2 Table 4.1 Average Pre-Construction Sound Levels – Nobles 2 Wind Farm .................. 18 David Braslau Associates, Inc. Westwood Professional Services, Inc. Nobles 2 – Pre-Construction Noise Monitoring 1.0 INTRODUCTION 1.1. Study Description This Pre-Construction Noise Monitoring Report presents results of ambient sound level monitoring at four locations distributed throughout the Nobles 2 Wind Farm site in Nobles County, Minnesota. Larson-Davis Model 831 Type 1 sound level meters were set up at the following four properties. “Hxx” is the home property designation on the site. Sound Level Meter Unit 1 [M1] + Weather Station H75 12171 Erickson Avenue Wilmont, MN 56185 Sound Level Meter Unit 2 [M2]+ Weather Station H259 18407 McCall Reading, MN 5665 Sound Level Meter Unit 3 [M3] H170 19067 160th St. Wilmont, MN 56185 Sound Level Meter Unit 4 [M4] H67 12129 Knauf Avenue Fulda, MN 56131 Locations of the monitoring sites are identified on Figure 1.1. The heavy black line represents the most recent boundary of the proposed wind farm. The meters were generally placed within about 100 feet from each residence as noted on the aerial photographs in Appendix A. Photographs of the sound level meter locations are included in Appendix B. Monitoring was initiated on Friday afternoon, March 4, but restarted on March 9, 2016 due to strong winds and meter blow down at 2 am on March 6. Meters were collected on Sunday, March 13, providing for four full days with favorable weather conditions. 1.2. Study Objectives The objective of the study is to measure sound levels over a week period (which was reduced somewhat due to weather conditions) to establish representative pre-construction sound levels within the wind farm boundary. Two different sound level metrics have been provided for daytime and nighttime periods: Leq (day) The average sound energy level over the time 0700 to 2200 Leq (night) The average sound energy level over the time 2200 to 0700 L50 (day) The L50 or median sound level during the period 0700 to 2200 L50 (night) The L50 or median sound level during the period 2200 to 0700 David Braslau Associates, Inc. Page 1 Westwood Professional Services, Inc. Nobles 2 – Pre-Construction Noise Monitoring The State of Minnesota does not have noise standards that govern the Leq metric, although it is used in federal guidelines such as those by the FAA, FHWA, HUD, and FTA. The L50 level is governed by Minnesota Rule 7030 on noise control. L50 is the median hourly sound level or level exceeded for 50 percent or 30 minutes in an hour. The state standards for the L50 metrics for NAC-1 (Noise Area Classification that includes residential land uses) are presented in Table 1.1. Daytime hours are 7 am to 10 pm, while nighttime hours are 10 pm to 7 am. Table 1.1 Minnesota Noise Standards (Mn. Rules 7070.0040) Time Period Daytime L50 Nighttime L50 NAC-1 (residential and sensitive areas) 60 dBA 50 dBA 1.3. Meteorological Conditions Monitored weather conditions prior to meter and weather station blow down showed increasingly stronger winds over the period. However, after setup on March 9, the weather stations recorded stable conditions through the remainder of the monitoring period. For completeness, hourly weather reports from Worthington Airport have been compared with the weather station data from M1 (which was the furthest location from the airport) to demonstrate regional consistency in weather conditions. Locations of the two weather stations and Worthington Airport are shown in Figure 1.2. A comparison of hourly wind speeds at M1 and Worthington Airport is presented in Figure 1.3. The hourly temperature variation during the monitoring period is shown in Figure 1.4 for both M1 and the Worthington Airport. The temperatures were generally quite close except for some unexplained variations during the period of highest wind speed in the middle of the monitoring period. David Braslau Associates, Inc. Page 2 Westwood Professional Services, Inc. Nobles2 – Pre-Construction Noise Monitoring H67 H75 M4 M1 H170 M3 H259 M2 Figure 1.1 Location Homes and Sound Monitors within the Nobles 2 Boundary \ David Braslau Associates, Inc. Page 3 Westwood Professional Services, Inc. Nobles2 – Pre-Construction Noise Monitoring Figure 1.2 Location of Monitoring Sites Between Weather Stations David Braslau Associates, Inc. Page 4 David Braslau Associates, Inc. Inc. Associates, Braslau David 5 Page Figure 1.3 MonitoringPeriod Wind SpeedDuring Westwood Professional Services, Inc. Inc. Westwood ProfessionalServices, Wind Speed (mph) 10 15 20 25 30 0 5 12 14 16 18 20 22 10-Mar 2 4 6 8 10 12 14 16 18 20 22 11-Mar Worthington Wind speed-M1vs 2 4 6 8 Hour 10 12 14 16 18 20 22 12-Mar 2 4 6 Monitoring Noise Nobles2–Pre-Construction 8 10 12 14 16 18 20 22 13-Mar 2 4 6 8 10 M1 Worthington David Braslau Associates, Inc. Inc. Associates, Braslau David 6 Page Figure 1.4 MonitoringPeriod During Hourly Temperature Westwood Professional
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