November 12, Mr. Bryan Tripp Canadian Hydro Developers, Inc. 34 Harvard Road Guelph, ON N1G 4V8

Transcription

1 November 12, 2009 Mr. Bryan Tripp Canadian Hydro Developers, Inc. 34 Harvard Road Guelph, ON N1G 4V8 Re: Summer 2009 Acoustic Audit and Intermediate Verification Measurements Amaranth Transformer Station, Melancthon EcoPower Center Certificate of Approval (Air) Number X9NBQ Dear Mr. Tripp, As requested, Howe Gastmeier Chapnik Limited (HGC Engineering) has undertaken an acoustic audit of the Amaranth Transformer Station (TS) associated with the Melancthon EcoPower Center. This audit represents the third of four seasonal acoustic audits that will be conducted to assess the impact of the TS noise, as a condition of amendment to the Certificate of Approval (Air) Number X9NBQ issued October 17, 2007 by the Ministry of the Environment (MOE). Noise complaints were received from the residents during the measurement period; thereby, as per the Noise Management Protocol this acoustic audit also serves as the required Intermediate Verification Measurements. Four seasonal acoustic audits have been previously conducted, with measurements made in October 2007, February 2008, May 2008, August 2008, to assess the impact of the first of two planned 100 MVA transformers for the Melancthon I Wind Plant. The first three acoustic audits were conducted to assess the impact of a 100 MVA GE Prolec transformer. The GE transformer was replaced with a 100 MVA Siemens TP-720 transformer in June of 2008, and the summer 2008 acoustic audit was conducted to assess the impact of the new 100 MVA Siemens transformer. In addition, the acoustic barrier wall, which was originally open to the east side of the transformer, was extended on the east side, fully surrounding the transformer. This work had been completed prior to the summer 2008 acoustic audit. In October of 2008 the second of the planned Siemens TP-720 transformers was energized, as part of the Melancthon EcoPower Center (formerly Melancthon I Wind Plant and Melancthon II Wind

2 Canadian Hydro Developers, Inc., Amaranth Transformer Station Page 2 Plant). The new transformer is situated approximately 30 meters north of the first transformer. Two seasonal audits have been completed to assess the impact of both transformers for the Melancthon EcoPower Center, with measurements made in January/February 2009 and May This current audit (summer 2009) is the third audit to assess the impact of the operation of both Siemens transformers. This summer, in addition to the usual attended and unattended sound level measurements, source measurements were conducted of both the north and south transformers with the fans off (ONAN) and with the fans on (ONAF2). These measurements were compared to the published manufacturer data. The results are summarized below. The results of the summer 2009 audit are summarized below: 1. The data recorded in the summer 2009 seasonal acoustic audit indicates that the noise contribution from the TS at the three closest residences was in compliance with the MOE sound level limits during the measurement period, including the appropriate penalty to account for the tonality associated with the transformers. This is consistent with the results of the previous acoustic audits. 2. The comment logs of the residents observations and the formal complaints filed during this seasonal acoustic audit and the sound levels measured during these times afforded a useful opportunity to directly assess the noise conditions which are considered objectionable. The measurements show that the noise levels considered objectionable by the residents are well within the MOE sound level limits. 3. Sound intensity instrumentation and methods were used to measure the sound power level of both the north and south transformers with the fans on and off. The measured sound power levels were compared to the published source sound levels. The results indicate that the measured (actual) sound power levels of both the north and south transformer are less than the sound power levels calculated using the sound pressure levels provided by the manufacturer (Siemens) and the NEMA/CSA standard with the fans off (ONAN) and with the fans on (ONAF2). The measured (actual) source power levels were used in conjunction with the distance setback to determine a conservative estimate of the sound level impact of the TS at the closest receptor (neglecting the existing barrier and berm). This conservative calculation showed that the sound level impact of the TS at the closest residence (R02) would be 29 dba with the fans off and 34 dba with the fans on. Therefore, based on these measurements and calculations it can be concluded that the TS is in compliance with the MOE sound level limits.

3 Canadian Hydro Developers, Inc., Amaranth Transformer Station Page 3 The summer 2009 acoustic audit is presented in the following sections. We trust that this information is sufficient for your current needs. Please let us know if you have any further questions or concerns. Yours truly, Howe Gastmeier Chapnik Limited Megan Munro, BASc, EIT Brian Howe, MEng, MBA, PEng

4 Canadian Hydro Developers, Inc., Amaranth Transformer Station Page Introduction This summer 2009 acoustic audit of the Amaranth Transformer Station ( TS ), situated in the Township of Amaranth, County of Dufferin, followed the requirements of the Ministry of the Environment s ( MOE ) technical publication NPC-233 Information to be Submitted for Approval of Stationary Sources of Sound. The audit also employed the additional methodology described in a letter prepared by HGC Engineering, dated September 17, 2007, as agreed to by Dr. Al Lightstone of Valcoustics Canada Ltd. ( Valcoustics ) as the Township s acoustical specialist and John Kowalewski of the MOE. This letter, developed with input from the surrounding residents, is attached as Appendix A for continued reference. The audit methodology was revised based on the results of the autumn 2007 audit. The revisions to the methodology are described in a letter prepared by HGC Engineering, dated January 24, 2008 and is attached as Appendix B. Further to this, the autumn 2007 and winter 2008 audits showed that there is no correlation between turbine operation and sound levels at the TS. Based on this conclusion, HGC Engineering did not request that Canadian Hydro stop all turbines for a brief period during the spring or winter audits. Lastly, the measurement locations were modified to reflect the addition of the second transformer. This was outlined in a letter prepared by HGC Engineering, dated January 23, 2009 and is attached in Appendix C. As per the audit methodology prescribed for the Amaranth TS, the acoustic audit was based upon a complex series of attended and unattended sound measurements and other data recorded between August 26 and September 4, These included: attended and automated unattended sound level measurements conducted on the TS site; attended and automated unattended sound level measurements conducted at the three principal receptors adjacent to the TS; electrical power data provided by Canadian Hydro Developers, Inc. ( Canadian Hydro ) and verified against Independent Electrical System Operator ( IESO ) data for the same period; meteorological data monitored at one of the residences during the measurement period; and the residents own logs of observations made during the measurement period. Throughout this acoustic audit report the acronym TS is used to refer to the Amaranth Transformer Station as a whole. However, there are times when the transformer itself is meant, and at these times the word transformer is used.

5 Canadian Hydro Developers, Inc., Amaranth Transformer Station Page Background Certificate of Approval Air ( CofA ) Number X9NBQ was issued for the Amaranth Transformer Station on October 17, 2007 by the Ministry of the Environment ( MOE ). This CofA required that Canadian Hydro undertake four seasonal, post-abatement acoustical measurements of the Amaranth TS. In this regard, Canadian Hydro retained HGC Engineering to independently carry out the measurements. Four seasonal acoustic audits were conducted in October 2007, February 2008, May 2008 and August 2008 to assess the impact of a single transformer associated with the Melancthon I Wind Plant. These audits can be viewed on the company website ( These reports should be read in conjunction with this report as they provide the background and basis for the measurements. Aercoustics Engineering Ltd. (Aercoustics) prepared an Acoustic Assessment Report ( AAR ), dated February 25, 2008 in support of an amendment to the Amaranth Transformer Station existing CofA, X9NBQ. The AAR addresses several changes made to the Amaranth Transformer Station site. These changes include: replacing the 100 MVA GE Prolec transformer with a 100 MVA Siemens TP-720 transformer extending the barrier wall on the east side, fully enclosing the first transformer adding a second transformer to the site implementing a four sided acoustic barrier around the second transformer The first three acoustic audits (fall 2007, winter 2008 and spring 2008) were conducted to assess the impact of a 100 MVA GE Prolec transformer. The GE transformer was replaced with a 100 MVA Siemens TP-720 transformer. The summer 2008 acoustic audit was conducted to assess the impact of the new 100 MVA Siemens transformer. In addition, the acoustic barrier wall, which was originally open to the east side of the transformer, was extended on the east side, fully surrounding the transformer. This was completed prior to the summer 2008 acoustic audit. In October 2008 a second Siemens TP-720 transformer was energized. This new transformer is associated with the Melancthon II Wind Plant and is situated approximately 30 meters north of the first transformer. The amendment to the Certificate of Approval, X9NBQ requires Canadian Hydro to undertake four additional seasonal acoustic audits to assess the impact of both the 100 MVA transformers. In this regard, Canadian Hydro has retained HGC Engineering to independently carry out the measurements. Two seasonal audits have been completed to assess the impact of both transformers for the Melancthon EcoPower Center, with measurements made in January/February 2009 and May This summer 2009 acoustic audit represents the third of four seasonal acoustic audits which are part of the Amaranth Transformer Station and are associated with the Melancthon EcoPower Center (formerly Melancthon I Wind Plant and Melancthon II Wind Plant).

6 Canadian Hydro Developers, Inc., Amaranth Transformer Station Page 6 The six previous audits indicated that the Amaranth TS was operating in compliance with the applicable MOE sound level limits. Aercoustics prepared a Noise Complaint Management Protocol for Canadian Hydro Developers, Inc., dated March 14, This report was prepared at the request of Canadian Hydro to ensure that their facility continues to comply with all provincial standards and the conditions specified in the Certificate of Approval Air. This protocol defines a procedure for residents to raise their concerns regarding noise emissions from the transformer station and the actions required by Canadian Hydro to address their concerns. Official complaints regarding the acoustic emissions of the TS were reported during this seasonal audit. According to the Noise Complaint Management Protocol these complaints are to be addressed by this seasonal acoustic audit. The results will be discussed in Section 7.6, Resident Comment Logs and Registered Noise Complaints. 3.0 Site Description The TS is located on the east side of 10 th Line, south of 15 th Side Road, in Amaranth Township, County of Dufferin. There are two 100 MVA Siemens TP-720 transformers on the TS site, along with the supporting ancillary facilities. A drawing of the transformer, manufacturer s sound test results and a site plan showing the location of both transformers have been included in Appendix D. Figure 1A shows the TS in relation to the surrounding roads and residences, and Figure 1B illustrates the TS itself. There are five residences adjacent to the general area of the TS. One of these is the participating landowner and is not considered in this assessment given their association with the facility. The three closest residences are the key receptor locations, described in Table 1, with the Receptor ID following the nomenclature used in the original acoustical report prepared by Aercoustics Engineering Ltd. (August 2006). Table 1. Summary of Receptors. Resident Distance from ID Description Family Name Substation [m] R01 Kidd th Line northwest of TS 390 R02 Thompson th Line southwest of TS 360 R04 Whitworth th Line south of TS Sound Level Limits As described in the autumn 2007 acoustic audit and based on the MOE s guideline NPC-232 Sound Level Limits for Stationary Sources in Class 3 Areas (Rural), after accounting for the

7 Canadian Hydro Developers, Inc., Amaranth Transformer Station Page 7 tonal character of the transformer sound, the applicable MOE sound level limits for the sound level contribution of the Amaranth TS at the receptors are: daytime (07:00 19:00 hrs): dba night-time (19:00 07:00 hrs): 35 dba. These criteria apply to the Amaranth TS as a whole. It is important to realize that the guideline documents of the MOE do not require that noise from sound sources be inaudible at a residence. In fact, it should be understood that in a very quiet rural environment a sound level of 25 to 30 dba or less will likely be audible at times. The sound level limits of the MOE guidelines are presented in terms of hourly energy equivalent average sound levels; designated L EQ. This means that if sound levels vary somewhat over an hour, it is the average sound level rather than the maximum or minimum sound levels which is relevant. For the purpose of this investigation, L 90 sound levels recorded that the receptors will be used to judge compliance against these limits. L 90 sound levels are useful as they allow some separation of steady sound from an overall, aggregate measured sound level. That is: when a continuous sound such as the sound of the TS is masked at times by a louder transient sound such as those caused by wind gusts, birds, vehicles, and animals, the L 90 sound level tends to more accurately reflect the sound level contribution of the steady sound by itself than does the L EQ sound level. 5.0 Measurement Methodology The study is based on a complex collection of data series, obtained during the period from Wednesday, August 26 to Friday, September 4, More than a week-long period was chosen to collect data under a variety of weather conditions, and to include periods of different ambient sound conditions including day and night periods, and weekday and weekend periods. 5.1 Non-acoustic Data Various measurements of non-acoustic quantities such as wind speed and power production were required to conduct this audit. To acquire this information a number of actions were taken: On August 26 th, an automatic meteorological station was deployed at receptor R02 to record wind speed, wind direction, temperature, and humidity. This data is attached to this audit as Appendix E; The residents agreed to record observations regarding the subjective contribution of the TS sound throughout the measurement period. Summaries of the residents logs are attached to this report in Section 7.6: Resident Comment Logs and Registered Noise Complaints;

8 Canadian Hydro Developers, Inc., Amaranth Transformer Station Page 8 Following the measurements, power production data was also acquired from the IESO and Canadian Hydro. The data are attached as Appendices F and G, respectively. It is noted that based upon HGC Engineering s review, the data obtained directly from Canadian Hydro agreed with the IESO data. 5.2 Unattended Acoustic Measurements Eight unattended sound level meters were deployed and configured to record L EQ sound levels in 10-minute intervals. L 90 sound levels were also recorded. The locations of these instruments are shown on Figures 1A and 1B. Descriptions of the sound level meters are provided in the Instrumentation section of this report, and records of the L EQ and L 90 measurements are included in Appendices H and I, respectively. Three sound level meters were deployed inside the TS fence line, near the east fence and thus about 30 metres east of the centre of the transformers. These three locations are identified as Locations 2, 15 and 16 on Figure 1B and shown in Photo Plate 1. Three instruments were used in this area, rather than a single instrument, in order to provide some spatial averaging of the sound levels near the transformers. One sound level meter was placed on the southwest (switch side) of the acoustic barrier wall (Location 4), approximately 30 metres from the centre of the south transformer, monitoring noise from the switchgear (Photo Plate 2). Observations indicated that during the measurement period, the transformer audibility was low at this location. A sound level meter was also placed on the northwest (switch side) of the acoustic barrier wall (Location 17), approximately 30 metres from the centre of the north transformer (Photo Plate 3). This monitor was placed in the direction of R01, on the berm, primarily monitoring noise from the switchgear. Observations indicated that during the measurement period, the transformer audibility was low at this location. One sound level meter was also placed at each of the three residences described in Table 1. Locations were selected in conjunction with previous discussions with the residents, and were generally near the houses themselves, with little to no acoustic screening from the TS. The monitoring locations were consistent with those used in previous audits. 5.3 Attended Acoustic Measurements Attended measurements conducted over a series of one minute periods were made at the three receptors on August 26, August 28, August 31, September 1, September 2, September 3 and September 4, Observations as well as sound level measurements were made. The instrumentation used for these measurements is described in the Instrumentation section of this report.

9 Canadian Hydro Developers, Inc., Amaranth Transformer Station Page 9 One minute time periods were selected to best capture the steady sound from the TS in the absence of extraneous local noise sources (i.e. idling farm equipment, local car passbys, talking, etc.). As a result of the low sound level contribution from the TS and the surrounding trees, wildlife, roads and overhead flight path it is nearly impossible to eliminate all other noise sources, especially during the daytime. As a result, the L 90 sound levels are used as an indicator of the steady source sound level and depending on the other sound sources present during the measurement the L 90 sound level may still be overestimating the contribution from the TS at the residences. A variety of attended measurements were also conducted at various locations around the TS on September 2, The measurements were conducted over a period of five minutes and they were intended to: investigate the spectrum of the noise radiated by the TS; verify typical sound levels emitted by the TS and radiated in different directions; investigate propagation of sound with distance from the TS; Measurements were conducted simultaneously at three locations to the south, east, and northwest of the transformers at a distance of about 30 to metres. These locations are identified in Figure 1B as Locations 8, 9 and 17, respectively. At this distance of 30 to meters, the sound of the TS was the dominant source of noise. The three locations were then moved further from the transformer to investigate propagation with distance. As requested by the MOE, the microphones were manually swept in a continuous fashion over as large an area as practical while standing in one spot in an attempt to minimize any local effects of acoustic radiation patterns, modal interference, small-scale shielding phenomena, etc. which might cause variations in measured sound level from location to location. Several cycles of microphone location changes occurred during each of the five minute measurements. Larger swept areas were not used as footsteps were found to generate excessive noise. 5.4 Sound Power Level Measurements On September 2 and September 4, 2009 sound intensity measurements were conducted inside the barriers surrounding each of the transformers to determine the transformer sound power levels with the fans off (ONAN) and with the fans on (ONAF2). The sound power levels were compared to the published manufacturer s sound data. The sound intensity measurements were conducted using instrumentation and methods from ISO Standard , Acoustics Determination of sound power levels of sources using sound intensity Part 2: Measurement by scanning. Using a real time frequency analyzer and an intensity probe, an area of approximately 7.9 m by 10.2 m and 4.5 m tall was scanned. Sound intensity measurements were conducted within close proximity to each side of the transformer at a safe distance.

10 Canadian Hydro Developers, Inc., Amaranth Transformer Station Page Instrumentation MOE technical publication NPC-102, Instrumentation provides specifications for sound level measurement instrumentation. All equipment used in the Audit meets these requirements. 6.1 Unattended Acoustic Measurements Seven Bruel & Kjaer Sound Level Meters and one Larson Davis Integrating Sound Level Meter were used for the unattended monitoring. The instruments are described in Table 2 below. Table 2: Instrumentation used For Unattended Sound Level Measurements Measurement Location Instrument Make and Model Instrument Serial Number Location 2 (Southeast) Bruel and Kjaer Type Location 4 (Southwest) Bruel and Kjaer Type Location 15 (Northeast) Bruel and Kjaer Type Location 16 (East) Larson Davis LxT Location 17 (Northwest) Bruel and Kjaer Type Location 5 (R01) Bruel and Kjaer Type Location 6 (R02) Bruel and Kjaer Type Location 7 (R04) Bruel and Kjaer Type Both of the Bruel and Kjaer 2236 and 2238 sound level meters meet the specifications contained in technical publication NPC-102, however, the newer Type 2238 sound level meter has replaced Type 2236 in the Bruel and Kjaer catalogue. The Larson Davis LxT also meets the specifications of technical publication NPC-102. The clocks of all eight instruments were synchronized before being deployed. Correct calibration of the acoustic instrumentation was verified using Bruel and Kjaer and Rion acoustic calibrators. Wind screens were used on all microphones, consistent with the requirements of technical publication NPC-103, Procedures. Meteorological data was collected using a Davis Instruments Corp. Vantage Pro2 weather station, equipped with an anemometer, wind vane, thermometer, hygrometer, and barometer. The system was configured to record data in 10 minute intervals; consistent with the 10 minute interval recordings of the sound level meters. The MOE guidelines indicate that sound level measurements should not be conducted during periods with high wind speeds or precipitation. Specifically, technical publication NPC-102 indicates that measurements of low sound levels should not be undertaken when winds exceed

11 Canadian Hydro Developers, Inc., Amaranth Transformer Station Page 11 15km/h. However, as the winds in Amaranth Township are frequently strong, making the area the subject of interest for wind plants, some consideration of the sound level during higher wind speeds is appropriate. The data from the weather station is presented in Appendix E. 6.2 Attended Acoustic Measurements Three Hewlett Packard Type 3569A Real Time Frequency Analyzers (serial numbers 3222A00134, 3222A00199, and 3442A00141), in conjunction with Bruel & Kjaer Microphones, were used for the attended measurements. Correct calibration of the acoustic instrumentation was verified using Bruel and Kjaer and Rion acoustic calibrators. Wind screens were used on all microphones, consistent with the requirements of technical publication NPC Assessment and Discussion It is understood that there was an exceptional amount of local activity during the evening hours of this audit time period, including harvesting and farm maintenance. This was communicated by the residents on a number of occasions during coordination of attended measurements. 7.1 Unattended Acoustic Measurements Transformer Station Figure 2 shows the sound levels measured at five points around the transformers. Three sound level meters were located on the east side of the transformers, within the fenced area, at Locations 2, 15 and 16. The sound level monitor at Location 16 lost power on September 1, 2009 for a period of about 34 hours, resulting in no recorded data during this period. One sound level meter was located on the southwest side of the south transformer at Location 4. This location was selected to be in the direction of R02 and is consistent with previous audits. A fifth sound level meter was located on the northwest side of the north transformer at Location 17. This location was selected to be in the direction of R01. The sound level monitors at Locations 4 and 17 were not fully deployed until August 28, It should be noted that the sound levels on September 2, 2009 are elevated in part due to HGC Engineering (9:30am until 12:00pm) and Canadian Hydro technician s presence on site (after 12:00pm). Measurements at Location 2 are extremely variable, often less than 50 dba; however, there are several time periods where the sound level is steady, ranging between dba. Site observations indicated that the source of this steady sound level may be directly related to the control box for the capacitor bank situated close to this monitoring location cycling on and off. It should be noted that this steady sound measured at Location 2 does not affect the sound levels recorded at the other sound level monitors surrounding the transformers and therefore it does not influence the sound levels at the residences. Nevertheless, it is understood that Canadian Hydro has taken initial action to investigate this noise. Sound level measurements at Locations 15 and 16 show sound levels typically between and 45 dba during the measurement period. As expected, given the close proximity to the

12 Canadian Hydro Developers, Inc., Amaranth Transformer Station Page 12 transformers, site observations indicate that sound from the TS is clearly the dominant noise at these locations. The sound levels measured at Locations 15 and 16 during this summer 2009 acoustic audit are generally less than the sound levels recorded on the east side of the transformers during the first three acoustic audits, and comparable to the levels recorded during the most recent three audits (summer 2008, winter 2009 and spring 2009). Specifically, in the first three seasonal acoustic audits (October 2007, February 2008 and May 2008) sound levels on the order of 50 to 55 dba were consistently recorded on the east side of the transformer. Reduced sound levels, typically between 35 and 50 dba, were recorded during the summer 2008 audit. This 5-10 dba sound level reduction on the east side of the transformer is a result of both the new barrier wall and the replacement transformer installed in the spring of The southwest monitor location (i.e., Location 4) was sited near the switch gear associated with the south transformer, about 30 m southwest of the center of the south transformer. Any noise here would not be appreciably shielded from the residences. During the autumn 2007 audit the sound levels on this side of the barrier were occasionally higher than on the transformer side of the barrier. This phenomenon was investigated in the three seasonal audits that followed and the phenomenon was not repeated in any of the subsequent audits. The source of the higher sound levels was not specifically determined. During this summer 2009 acoustic audit, the magnitude of the measured sound levels at Location 4 follow the same general trend as the measured levels at other locations within the TS; however it generally increases during the evening hours after the peak temperature was reached for the day. These elevated sound levels may be due to insects or local activity (farming). The measured levels at Location 4 are higher than those measured directly east of the transformer, therefore it is clear that these elevated sound levels were influenced by other sound sources, in addition to the transformers themselves. The northwest monitor location (i.e. Location 17) was sited near the switch gear associated with the north transformer, about 30 m northwest of the center of the north transformer. Due to site geometry, the location was on top of the perimeter berm. Any noise here would not be appreciably shielded from the residence. Previous audits have shown periods of increased sound levels at this location due to elevated wind speeds and local sounds during daytime hours; however, during this summer 2009 acoustic audit, the magnitude of the measured sound levels at Location 17 was generally consistent with those measured at the other locations within the transformer station. Figure 2 also shows the background (L 90 ) sound levels recorded by the unattended sound level meters at the residences at times corresponding with the time of day noted in the residents observation logs. The L 90 sound level is cited in this case as it is a better indicator of the steady sound at the measurement location, rather than the aggregate sound of all sound sources. The

13 Canadian Hydro Developers, Inc., Amaranth Transformer Station Page 13 residents logs are summarized below in Section 7.6; Resident Comment Logs and Registered Noise Complaints. Figure 3a is a spectrogram of the unattended spectral measurements conducted at the east unattended measurement location (i.e., Location 16). The Figure confirms that the L eq sound levels vary with time, but that there are consistently peaks in particular A-weighted frequency bands (i.e., 125, 250 and 0 Hz), representing a relatively steady sound source. Sound levels on August 29, 2009 were elevated due to inclement weather and rain, this is illustrated on the figure. Figure 3b represents the same measurement location (Location 16), but the instrument was temporarily reconfigured for greater temporal resolution for this time period (8:15 to 9:33 on May 11, 2009). Figure 3c represents the same measurement location (Location 16), but the instrument was returned to 10-minute logging intervals. These figures indicate a similar conclusion to Figure 3a; the dominant A-weighted frequency bands are relatively steady when the influence of background sound was low. Figure 4 integrates the record of the electrical power monitored at the wind plant to the TS sound level data shown in Figure 2. The power production varied throughout the measurement period. There were many instances, particularly in the second half of the measurement period, where power production was low and a few instances where power production was high. Figure 4 does not show a consistent correlation between electrical power production and the measured sound levels at the transformer station. Figure 5 overlays the weather data on the sound levels near the transformers. During periods of higher wind speeds the monitors generally indicate slightly higher sound levels. Figure 5 also shows that the sound levels recorded near the transformers tend to increase with increasing temperature; however this is likely a result of the time of day and local farm activity including harvesting, as described earlier. 7.2 Unattended Acoustic Measurements Residences Figures 6a, 6b and 6c illustrate the L EQ unattended sound levels measured at the residences and the appropriate sound level criteria for the sound level contribution of the transformers. The recorded sound levels vary significantly over time and are obviously influenced by wind and local activities (i.e., traffic), and include the sound of aircrafts, animals, and voices as well as sound from the TS. Figures 6a, 6b and 6c show a number of instances when the L EQ sound levels are below the sound level limits during both the daytime and night-time hours when the transformers were operating. This is particularly true at night because the influence of local activity is relatively low. The MOE sound level limits apply only to the sound level contribution from the TS, therefore the L 90 sound level is often a better descriptor of the sound level contribution of a steady sound source than the L EQ sound level. Figures 6d, 6e and 6f illustrate the L 90 unattended sound levels measured at the residences and the appropriate sound level criteria for the sound level contribution

14 Canadian Hydro Developers, Inc., Amaranth Transformer Station Page 14 of the transformers. The L 90 sound levels exclude infrequent noise sources (i.e. car passbys, aircrafts, etc. although they include ambient noises of longer duration such as wind and rain). As shown on Figures 6d, 6e and 6f, the L 90 sound levels are generally well below 35 dba during night-time hours and dba during daytime hours, indicating compliance with the MOE sound level limits during these times. Sound levels were elevated at all three residences during periods of inclement weather, during the afternoons of August 28 and August 29, 2009 and during several evening periods. During the afternoon of August 28 and August 29, 2009 the wind speeds were on the order of 4 to 6 m/s, increasing the background sound levels, this is shown on Figures 8d, 8e and 8f). In addition, the levels measured at the TS were similar in magnitude to those measured near the residences during the afternoon of August 28 and August 29, 2009, confirming the measured levels at the residences were dominated by natural and/or local sound sources and not the TS, this is shown in Figures 7d, 7e and 7f. As described earlier, harvesting was ongoing during the evening periods throughout the audit, causing elevated sound levels at all three residences. Figures 7a, 7b and 7c compare the unattended L EQ measurement data from the TS to the unattended L EQ data at the residences and Figures 7d, 7e and 7f compare the unattended L EQ measurement data from the TS to the unattended L 90 data at the residences. In general, the sound levels at both the TS and the receptors tend to increase during the daytime and evening hours and decrease during the night-time hours. At times, the sound levels recorded at the residences were louder than those recorded at the TS. There is no other consistent correlation between the recorded sound levels at the receptors and at the TS, which tends to suggest that while the sound levels at the residences are varying, the contribution of the transformers by themselves was not a dominant contributor to the sound levels measured at the residences. Figures 8a, 8b and 8c illustrate the L EQ sound levels at the residences against the recorded weather data and Figures 8d, 8e and 8f illustrate the L 90 sound levels at the residences against the recorded weather data. Measured sound levels correlate closely with local wind rather than the TS sound levels. As noted, sound levels were elevated during the afternoon of August 28 and August 29, 2009, which corresponds to the time periods with elevated ground level wind speeds (on the order of 4 to 6 m/s). This correlation demonstrates that the wind is a key contributing source of noise at the residences. The fact that the sound levels at the residences were not correlated with the sound levels at the TS, the fact that sound levels at the residences were often less than 30 dba when the TS was operating and producing noise, and the fact that the sound levels at the residences seem to correlate closely with the wind speed rather than the TS noise indicate that the sound contribution of the TS was in compliance with the MOE sound level limits during the measurement period. 7.3 Attended Acoustic Measurements Transformer Station Figure 9 illustrates the results of the measurements conducted simultaneously over a five minute period at three locations (i.e., Locations 8, 9 and 17) around the TS, 30 to metres from the

15 Canadian Hydro Developers, Inc., Amaranth Transformer Station Page 15 centre of the transformers. These positions are consistent with the winter and spring 2009 acoustic audits. The distances were somewhat forced by the site geometry; any closer and Location 9 would have been affected by acoustic reflections off of a large concrete retaining wall, and any further and Location 8 would have been behind an earthen berm (i.e., shielded from the transformer). Figure 9 represents the L EQ spectra of the five minute measurement. This figure indicates tonal noise at all of the measurement locations, with a principal frequency of 125 Hz. The magnitude of this tone is slightly higher than the measurements conducted for the winter and spring 2009 acoustic audits. During these measurements the microphones were continuously swept over as wide an area as practical while standing still, with several cycles of microphone location occurring during each measurement. Figure 10 shows sound level spectra obtained by approximately doubling the distance between the instruments and the transformer (i.e., Locations 12, 13, and 18). In general, the sound levels decreased due to the increasing separation from the transformers. The figure indicates tonal noise with a principal frequency of 125 Hz. Three Fast Fourier Transform ( FFT ) measurements were conducted at Location 19, approximately metres from the centerline of the transformers. These measurements are summarized in Figure 11, which illustrates the frequency makeup of the sound of the transformers in some detail. The sound is tonal with peaks at 120, 2, 360 and 480 Hz, with other harmonics present. The peak sound pressure level at 120 Hz was approximately 41 decibels for the first measurement, 41 decibels for the second measurement and 44 decibels for the third measurement. The FFT measurements of the transformers indicate a frequency profile that is typical for electrical transformers. Transformer noise is typically tonal at the electrical frequency of 60 Hz and harmonics of this frequency. The FFT measurements conducted in the Summer 2008 acoustic audit, the Winter 2009 acoustic audit and this Spring 2009 acoustic audit indicate that the peak sound pressure level is present at 120 Hz, whereas the previous acoustic audits (conducted for the GE transformer) indicated a peak sound pressure level at 360 Hz. 7.4 Sound Power Level Measurements The sound power levels of both the north and south transformers were measured by HGC Engineering on site, using sound intensity instrumentation and methods. Unlike a simple sound level meter which measures sound pressure, a sound intensity analyzer uses a highly directional probe with a special pair of phase-matched microphones. Sound intensity techniques can generally achieve 10 to 20 db better rejection of background sound than a simple sound pressure measurement. Sound power levels are different than sound pressure levels. Sound power levels are commonly used to define the strength of the sound source itself, whereas sound pressure levels

16 Canadian Hydro Developers, Inc., Amaranth Transformer Station Page 16 include other sound sources and are indicative of what our ears hear. These values should not be confused. Sound intensity measurements were conducted with the fans off (ONAN) on September 2, 2009 and on with the fans on (ONAF2) on September 4, The measured sound levels were compared to the published source sound levels from the transformer manufacturer, in the form of NEMA/CSA standard sound pressure levels, which were converted to sound power levels by applying an appropriate area factor. The results are summarized in Table 3 and they indicate that the measured (actual) sound power levels of both the north and south transformer are less than the sound power levels using the data provided by the manufacturer (Siemens) and the NEMA/CSA standard both with the fans off (ONAN) and with the fans off (ONAF2). Table 3: Summary of Measured and Calculated Manufacturer Sound Power Levels Transformer Fans On/Off Sound Power Level Determined through Sound Intensity Measurements (dba re W) Sound Power Level Determined by Converting the Published Manufacturer Sound Pressure Levels using an Appropriate Area Factor Defined by NEMA/CSA (dba re W) North ONAN North ONAF South ONAN South ONAF Using the measured sound power levels a simple calculation was performed to determine the theoretical sound pressure level at the closest residence (R m) with both transformers operating with the fans off and on. The results indicate that considering only the distance setback the sound pressure level at R02 with both transformers operating, with their fans off, would be on the order of 29 dba and with both transformers operating, with their fans on, would be 34 dba. This calculation only considers the distance setback and neglects the impact of the barrier and berm, which are known to provide a significant sound level reduction in addition to that obtained from the distance setback alone. These measurements and calculations confirm that the sound level contribution of the TS is well within the sound level limits specified by the MOE.

17 Canadian Hydro Developers, Inc., Amaranth Transformer Station Page Attended Acoustic Measurements Residences Attended measurements were also conducted at each of the residences and the results are summarized in Table 4. These are short-duration measurements, generally one minute long, taken at moments when the influence of extraneous noise (i.e., dogs, birds, farm animals, speech, cars and aircraft) was low. Table 4: Summary of Attended Measurements at Receptors Location Date and Time L EQ [dba] R01 R02 L 90 [dba] August 26, : August 31, : September 1, 2009 <20 <20 4:00 <20 <20 Comments Wind, wind in trees, distant traffic, TS not audible TS audible, crickets TS audible September 3, Tractor at neighbours, insects, TS 22: not audible September 4, Distant dog, insects, TS faintly 1: audible September 4, Distant traffic, birds, light breeze 9: in the trees, TS not audible August 26, : Distant talking, TS not audible August 31, : September 1, 2009 <20 <20 4:15 <20 <20 September 3, : September 4, : Distant farm animals, crickets, TS barely audible TS audible (primarily switch gear) Tractor at neighbours, insects, TS not audible Distant dog, faint insects, TS audible September 4, : Distant traffic, distant farm animals, insects, TS not audible

18 Canadian Hydro Developers, Inc., Amaranth Transformer Station Page 18 Location R04 Date and Time L EQ [dba] L 90 [dba] August 26, : August 31, : September 1, <20 4:30 <20 <20 September 3, : September 4, : September 4, : Comments Wind in trees, distant traffic, birds, TS not audible Occasional farm animal, TS audible TS audible Tractor at neighbours, insects, TS not audible Distant dog, faint insects, TS audible and dominant Distant plane overhead, occasional farm animal, insects, light breeze in trees, TS not audible As shown in Table 4, the measured L EQ sound levels at the three receptors ranged from less than 20 dba to 46 dba and the L 90 sound levels ranged from less than 20 dba to 43 dba. The measured L EQ sound levels represent the aggregate sound level due to all sound sources in the area including sound from distant vehicles, farm animals, distant and local dogs, birds, talking, and wind-induced noises. As the measurements include the effect of these intermittent and extraneous sound sources, the measured L 90 represents a better estimate of the steady sounds, including the noise from the TS. As Table 4 indicates, the TS noise was only audible when the L 90 sound levels were 32 dba or less. This tends to indicate that TS noise is only audible when background noise is very low and below MOE guidelines. This observation is consistent with previous audits. Influence of the Second Transformer at the Residences This audit (summer 2009) was the third to be conducted with both transformers energized. During this audit the transformers were, at times, audible to some degree. During this investigation, the L 90 sound levels were less than 32 dba during periods of transformer audibility. The most recent audit (spring 2009) was also conducted with both transformers energized. During the spring 2009 audit attended measurements conducted during periods of transformer audibility at the residences also showed L 90 sound levels less than 32 dba. During the winter 2009 audit was also conducted

19 Canadian Hydro Developers, Inc., Amaranth Transformer Station Page 19 with both transformers energized and attended measurements conducted during periods of transformer audibility at the residences showed L 90 sound levels less than 23 dba. The summer 2008 audit was conducted for one-siemens transformer. During the summer 2008 audit, attended measurements conducted during periods of transformer audibility at the residences showed the L 90 sound levels between 20 and 22 dba. The first three audits (fall 2007, winter 2008 and spring 2008) were conducted for the original GE transformer. During these audits, attended measurements conducted during periods of transformer audibility at the residences showed L 90 sound levels between 22 and 33 dba. Theoretically, the addition of the second transformer should have increased the sound levels at the residences by up to 3 decibels; however, the variability associated with the measurements due to various environmental and seasonal factors is more than 3 decibels, which makes it difficult to determine the magnitude of the sound level changes due to the addition of the second transformer. Regardless, the measured sound levels remain well within the MOE sound level limits with both transformers operational. In an attempt to further quantify the sound level contribution of the TS at the residences, a series of FFT measurements were made at the three receptor locations when the transformer hum was audible. These measurements were made during the nighttime hours on September 1 and September 4, Representative measurements from R01, R02 and R04 are summarized in Figure 12. Tones from the transformer were measured at 120 and 360 Hz at the receptors, confirming transformer audibility at the residences. 7.6 Resident Comment Logs and Registered Noise Complaints The residents have provided their comments for the measurement period. These comment logs have been included below. Additionally, several official complaints were registered with Canadian Hydro during the measurement period from the residents at R01 (Kidd) and R04 (Whitworth). Table 5 summarizes the dates and times that the noise complaints were received by Canadian Hydro from the neighbouring residences. This table also indicates the resident that filed the complaint, the corresponding L EQ and L 90 sound levels recorded by the automatic monitors at the time of the complaint, and the weather conditions recorded by the ground level weather station situated at R02.

20 Canadian Hydro Developers, Inc., Amaranth Transformer Station Page 20 Table 5: Summary of Formal Complaints Received during the Measurement Period Date and Time Receptor L EQ at Receptor [dba] L 90 at Receptor [dba] Ground Level Wind Speed [m/s] August 28, 2009, 6:25 Kidd m/s, E This is Terry Kidd and I m calling from the 10 th Line of Amaranth Twp. It is almost 6:30 in the morning. I am complaining about this noise from the substation again. August 30, 2009, 7:56 Whitworth m/s, W Ted Whitworth called to report that the noise in his house, he assumes from the transformer, has been terrible all night and still is. August 31, 2009, 5:42 Whitworth m/s Ted Whitworth called to report that his house was humming all night long. As shown on Table 5, the measured L 90 sound levels were less than or equal to 31 dba at the time of all three registered complaints. This further indicates that the TS continues to be in compliance with the MOE sound level limits and residents concerns continue to be related to audibility and not to the absolute magnitude of the sound. Tables 6 through 8 summarize the dates and times that the residents have noted the sound from the transformer station to be audible or perceptible inside or outside of their homes. These tables also include the corresponding L EQ and L 90 sound levels recorded by the automatic monitors at the time noted on the log, the weather conditions recorded by the ground level weather station situated at R02 and the text noted in the comments themselves.

21 Canadian Hydro Developers, Inc., Amaranth Transformer Station Page 21 Table 6: Summary of Unattended Sound Level Measurements during times when the Residents of R01 (Kidd Residence) have noted the Transformer Station to be Audible or Perceptible Inside or Outside of their Homes) Date and Time August 26, :30 August 26, :00 L EQ at Receptor [dba] L 90 at Receptor [dba] Ground Level Wind Speed [m/s] m/s, N m/s, N Comments House is ringing, shoulders and neck have pins and needles as I write this. I do not feel floor vibration this evening. Outside, at 7:30 p.m., chiming noises are very evident in the air. Outside, the transformer is not audible; when I stand beside the microphone facing south my shoulders and neck are pins and needles. August 27, :45 August 27, :45 August 27, :30 August 27, : m/s, NE m/s, NE m/s, NE m/s, NE Arrived home at 5:45 a.m. Transformer is audible and remains audible until at least 6:45 a.m. The house is ringing. Arrived home this evening at 5:30 p.m. Transformer is not audible. In the kitchen, while preparing the cat food, there are pins and needles in my neck and back. The basement is chiming and I can feel pressure around my head. The transformer is audible again in the kitchen while preparing dinner, my shoulders and the left side of my neck continue to have pins and needles. There is also a low hum through the basement. We departed this evening at 8:35 p.m.

22 Canadian Hydro Developers, Inc., Amaranth Transformer Station Page 22 Table 6, Comments from R01 (Kidd Residence) con t I did not return home this morning; Terry tended to the horses himself. August 28, : m/s, E I arrived home at approximately 5:45 p.m.; the transformer is not audible but the house is ringing tenfold. I knew it would be bad inside the house because as I walked towards the door across the deck my neck and back were already pins and needles. During the time I was outside (from approximately 5:50 p.m.), the barn is also ringing. There is a rainstorm expected tonight and I do not want to lock the horses in. August 28, : m/s, E As I am writing this, my shoulder is numb (7:00 p.m.) In the kitchen, the floors are vibrating slightly. There is a moderate east wind, and we have had a small amount of rain. August 28, : m/s, E At 8:45 p.m., we returned home to pick up the dog the house is still ringing and again, as I write this note, my shoulders have once again went numb while in the kitchen. Several time periods have been shaded grey to indicate that the wind speeds were greater than 15 km/hr (4.2 m/s); which is used as a threshold for measuring low sound levels according to the MOE s technical publication NPC-102. Several time periods were also shaded grey to indicate precipitation. Sound levels recorded during these periods are not representative of the steady source sound level associated with the transformer station.

23 Canadian Hydro Developers, Inc., Amaranth Transformer Station Page 23 Table 6, Comments from R01 (Kidd Residence) con t August 29, Did not return home for any substantial amount of time; it is my daughter s birthday and she is not to return to the farm. August 30, : m/s, NW 11:30 a.m. the inside of the house is chiming; I can feel internal vibrating while sitting in the house (living room). August 30, : 28 0 m/s The transformer is slightly audible; the night is cool, no wind and believe it or not, it is not raining. Walking across deck to door tops of shoulders go numb. Inside, the house is still chiming. Can feel hum sitting in kitchen, stomach is nauseas obviously, it s time to go. August 31, : m/s, W Arrived home at 5:30 p.m. The transformer is not audible however there is plenty of electricity in the air; in the barn, on the deck, in the fields and most definitely in the house. After chores, I ve tried to stay out of the kitchen s much as possible as my shoulders are constantly numb; there is a shrill ring throughout the house the kitchen and the bathroom are to the point of deafening! While barbequing dinner on the deck, my shoulders are more numb than not. (At this particular time in my notes, I was very angry with the entire situation, I will not be repeating what I wrote).

24 Canadian Hydro Developers, Inc., Amaranth Transformer Station Page 24 Table 6, Comments from R01 (Kidd Residence) con t September 1, : m/s, W Arrived home at 5:30 p.m. The transformer was not audible but a high pitch ringing was evident as soon as I stepped out of the truck. September 1, : m/s I was outside from 5:30 p.m. to 7:45 p.m. it is a beautiful evening, the sun is shining, there is no precipitation BUT there is shrill ringing everywhere and my shoulders are constantly numb. How much nerve damage could I possibly be subjected myself too? September 1, :00 September 2, : m/s m/s, S The ringing in the house is very shrill this evening; I had a headache in a very short period of time of being indoors; while traveling throughout the house by neck and shoulders were constantly going numb. I did notice that a lot of turbines were off tonight. Spent the day in Toronto returned home at approximately 6:45 p.m. Walking across the deck to the door my neck goes numb. Amazing, I spent the entire day in public malls, walking through the college campus and I get home and the extra energy is flowing. While preparing the cat food in the kitchen, standing by the sink, you can hear a high pitch ring and my neck in once again numb. While outside, there are various areas where my neck and back are constantly numb. Note the tractor has been running since 6:30 p.m. so I m sure you won t be able to record a single spike.

25 Canadian Hydro Developers, Inc., Amaranth Transformer Station Page 25 Table 6, Comments from R01 (Kidd Residence) con t September 3, : m/s Arrived at 6:35 a.m the transformer is quite audible. It is making a chugging sound. There is electricity in the air. I believe the turbines are off. It is approx. 12 degrees, no wind but low ground fog. The house isn t as bad today however the ringing is still present. Head, neck and shoulders are not going numb as much as usual. September 3, :00 September 3, : m/s, W m/s Arrived home at 6:00 p.m., noted the turbines are again not spinning. House is extremely electrical, neck is often going numb. When return from outside (approx. 7:45p.m.), the base of my neck is really sore. I have a few phone calls to make then we re leaving; we are truly fortunate that we have somewhere else to sleep.

26 Canadian Hydro Developers, Inc., Amaranth Transformer Station Page 26 Table 7: Summary of Unattended Sound Level Measurements during times when the Residents of R02 (Thompson Residence) have noted the Transformer Station to be Audible or Perceptible Inside or Outside of their Homes) Date and Time August 26, :00 August 27, :00 August 28, :30 August 29, :50 August 30, :30 August 30, :30 August 31, :00 September 1, :30 September 1, :00 L EQ at Receptor [dba] L 90 at Receptor [dba] Ground Level Wind Speed [m/s] m/s, N TS is audible m/s, E TS is audible m/s, E TS is audible m/s, E TS is audible m/s, W TS is audible m/s TS is audible m/s TS is audible m/s TS is audible m/s TS is audible Comments

27 Canadian Hydro Developers, Inc., Amaranth Transformer Station Page 27 Table 7, Comments from R02 (Thompson Residence) con t September 1, :35 September 2, :00 September 3, :20 September 4, :00 September 4, :00 September 4, : m/s TS is audible m/s TS is audible m/s TS is audible m/s TS is audible m/s TS is audible m/s TS is audible

28 Canadian Hydro Developers, Inc., Amaranth Transformer Station Page 28 Table 8: Summary of Unattended Sound Level Measurements during times when the Residents of R04 (Whitworth Residence) have noted the Transformer Station to be Audible or Perceptible Inside or Outside of their Homes) Date and Time August 26, :34 August 26, :29 August 27, :38 August 27, :20 August 27, :50 August 27, :00 August 28, :50 August 28, :12 L EQ at Receptor [dba] L 90 at Receptor [dba] Ground Level Wind Speed [m/s] m/s, N m/s, N still buzzing at 11:29 p.m m/s 4.38 a.m. temperature 48F, Comments 9:34 p.m. low buzz heard inside and outside the house, the air is still and the temperature is 50F m/s, N buzzing sound still heard 5:20 a.m m/s, NE m/s, E m/s, E m/s, E roar continues at 7:12 a.m. regular roar in the house PLUS a high pitch squeal ongoing noise and squeal at 5:50 a.m., temperature is 44F, away from 9:05 a.m.to 4:45 p.m. 10 p.m. temperature 50F, clear, still night, frogs etc. singing but low buzz from transformer is still audible slept fitfully, awake several times 4:50 a.m. temperature 44 roaring sound, accompanied by a high pitch squeal in house, transformer is audible outside

29 Canadian Hydro Developers, Inc., Amaranth Transformer Station Page 29 Table 8, Comments from R04 (Whitworth Residence) con t August 28, :30 August 28, :10 August 29, :50 August 29, :52 August 29, :45 August 30, :20 August 30, :00 August 30, : m/s, E m/s, E m/s, E m/s, E roaring sound heard inside throughout the day, noted at 10:30 a.m. and 4:10 p.m. 4:50 a.m., temperature is 50F, raining, house is roaring and vibrating 7:52 a.m. house is still roaring with a high pitch squeal over and above the roar, roaring throughout the afternoon, Ted has a severe headache all day, can get no relief even with medication m/s, S roaring still ongoing at 11:45 p.m m/s, W m/s, W Ted phoned MOE at 8 a.m. 4:20 a.m., temperature 50F, it has been raining extreme rumbling and roaring inside and out, making pressure on my ears noise is also accompanied by a high pitch whine, we had a terrible night, being awake many times m/s away, but then loud rumble at 8:50 p.m. Several time periods have been shaded grey to indicate that the wind speeds were greater than 15 km/hr (4.2 m/s); which is used as a threshold for measuring low sound levels according to the MOE s technical publication NPC-102. Several time periods were also shaded grey to indicate precipitation. Sound levels recorded during these periods are not representative of the steady source sound level associated with the transformer station.

30 Canadian Hydro Developers, Inc., Amaranth Transformer Station Page 30 Table 8, Comments from R04 (Whitworth Residence) con t August 30, :15 August 31, :50 August 31, : August 31, : m/s medium buzz at 10:15 outside, and regular roar inside temperature 48F m/s 2:50 a.m. temperature 44F, steady hum in house and outside m/s m/s 5: a.m. temperature 42F, heavy fog/mist,ongoing buzz inside and outside plus high pitch whine, Ted has a severe headache, noise ongoing in the house throughout the morning, away mid part of day Megan Monroe arrived at approximately 10:00 p.m., in conversation with Ted, noted that she could hear the transformer outside we heard the usual rumbling/roaring inside, 10:20 p.m. temperature 45F clear, still night, frogs singing, and transformer is distinctly audible over the noise of the frogs, there is pressure on my ears September 1, :00 September 1, : m/s m/s 5 a.m. temperature F. cold, clear and still outside regular buzz inside and out, heavy low lying fog at daybreak, away in morning. Cheryl has a severe headache all afternoon 10:30 p.m. the temperature is 50F, the frogs and singing and the low buzz of the transformer is heard outside

31 Canadian Hydro Developers, Inc., Amaranth Transformer Station Page 31 Table 8, Comments from R04 (Whitworth Residence) con t September 2, :18 September 2, :20 September 2, :45 September 2, :10 September 3, :30 September 3, :30 September 3, :30 September 3, : m/s 5:18 a.m. distinct buzz outside, temperature 45F, air still roaring, buzzing and high pitch squeal inside m/s buzz still ongoing outside at 8:20 a.m m/s, W m/s, S m/s same roaring, buzzing and squeal inside at 10:45 a.m. buzzing and pressure on my ears at this time, continues on throughout the day 10:10 p.m. temperature is 56F, still, clear, with frogs singing, but transformer is clearly audible outside and roaring continues in the house 3:30 a.m. usual roar in house, pressure on ears temperature 46F, m/s still outside roar ongoing at 5:30 a.m., m/s worsening at 7: m/s, NW left the house at 9:30, while the noise is still ongoing Several time periods have been shaded grey to indicate that the wind speeds were greater than 15 km/hr (4.2 m/s); which is used as a threshold for measuring low sound levels according to the MOE s technical publication NPC-102. Several time periods were also shaded grey to indicate precipitation. Sound levels recorded during these periods are not representative of the steady source sound level associated with the transformer station.

32 Canadian Hydro Developers, Inc., Amaranth Transformer Station Page 32 Table 8, Comments from R04 (Whitworth Residence) con t September 3, :15 September 3, :30 September 4, : September 4, : m/s, SW returned at 4:15 to a slight hum m/s m/s 10:20 p.m. low buzz in house, a loud lawnmower sound is heard outside, possibly at the Broeze's (who cuts their grass at this time of night? low buzz and squeal heard inside from 10:30 p.m. onward 5: a.m. regular buzz inside, low buzz outside, temperature 45F m/s 7:38 buzz inside is coupled with a high pitch squeal

33 Canadian Hydro Developers, Inc., Amaranth Transformer Station Page 33 As shown in Tables 5 through 7, the measured L EQ sound levels at the three receptors ranged from 24 to 67 dba and the L 90 sound levels ranged from 22 dba to 46 dba. Several time periods have been shaded grey to indicate that the wind speeds were greater than 15 km/hr (4.2 m/s); above these wind speeds MOE guidelines recommend that it is not appropriate to conduct sound level measurements of low level sounds. Several time periods were also shaded grey to indicate precipitation. During periods of appropriate weather, the L 90 sound levels were generally less than 35 dba during periods of audibility, with eleven exceptions during the daytime and evening hours. Elevated sound levels are expected during daytime hours due to local activity. In addition, as outlined above, during the evening hours of this audit, there was a considerable amount of local activity including farm maintenance and harvesting. Some comments regarding local activity (outdoor work) have also been included in the resident comment logs. As discussed previously, site observations continue to indicate that the TS is only audible and dominant when the background sound levels are very low. Consequently, the eleven exceptions of increased sound levels are likely due to local activity near the residences and the defined sound level limits apply only to the sound level contribution of the TS. To further support this conclusion the sound levels recorded at the transformer station did not indicate any notable evidence of elevated sound levels during these time periods. In addition, as shown on Figure 2 some of these elevated sound levels were greater than the sound levels recorded at the transformer station. The unattended sound levels at all of the receptors often show a large separation between the measured LEQ and the measured L90 sound levels. This large separation is an indication of an increased amount of local activity present during the 10-minute period that occurs for less than 90% of the measurement period; these sounds may include car passbys, conversation, impulses, farm animals, etc. The analysis of the recorded sound levels in conjunction with the residents comments is consistent with previous audits and confirms that the impact of the TS is in continual compliance with the MOE sound level limits, even during time periods when the residents have noted the TS to be audible. 8.0 Summary and Conclusions 1) The measurements show no consistent correlation between the sound levels at the residences and the sound levels near the transformer. It is noted that the sound levels at the residences are at times less than 30 dba during periods when the TS is operating and producing noise. The sound at the residences correlated more closely with wind speed and local activity rather than the TS. These facts indicate that during the measurement period the contribution of the TS was in compliance with the applicable MOE sound level limits, which account for the tonality associated with the transformer. It should be noted that a steady sound was isolated at monitoring Location 2. The source of this sound is believed to be coming from the control box for the capacitor bank. This sound source is not impacting the sound levels recorded at any of the neighbouring meters and certainly not the residences; however it is understood that Canadian Hydro has taken action to investigate this noise.

34 Canadian Hydro Developers, Inc., Amaranth Transformer Station Page 34 2) The comment logs of the residents observations and formal noise complaints logged by Canadian Hydro Developers as per the Noise Complaint Protocol during this seasonal acoustic audit and the sound levels measured during the times of the observations indicate that the impact of the TS is often considered objectionable when background sound is low, indicating that the concerns may be more related to audibility in a very quiet environment rather than to the absolute magnitude of the sound level impact. Audibility does not indicate non-compliance with the MOE guidelines. The attended measurements conducted at the three receptor locations verify that the transformer is in compliance with the applicable MOE sound level limits but can be audible when the background sound levels are low. 3) The sound power levels of both the north and south transformers were measured by HGC Engineering with the fans on and off, using sound intensity instrumentation and methods. The measured sound power levels were compared to the published source sound levels. The results indicate that the measured sound power levels of both the north and south transformer are less than the sound levels provided by the manufacturer (Siemens) both with the fans off (ONAN) and with the fans on (ONAF2). Calculations indicate, that based on the measured source power levels and the distance setback (neglecting the existing barrier and berm), the sound level impact of the TS at the closest residence (R02) would be 29 dba with the fans off and 34 dba with the fans on. Therefore, based on these measurements and calculations it can be concluded that the continues to be in compliance with the MOE sound level limits.

35 Canadian Hydro Developers, Inc., Amaranth Transformer Station Page 35 Photo Plate 1: Monitoring Locations 2, 15 and 16, East Side of Transformers, Looking North

36 Canadian Hydro Developers, Inc., Amaranth Transformer Station Page 36 Photo Plate 2: Monitoring Location 4, Southwest Side of the South Transformer, Looking West

37 Canadian Hydro Developers, Inc., Amaranth Transformer Station Page 37 Photo Plate 3: Monitoring Location 17, Northwest Side of the North Transformer, Looking East

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