HomeMy WebLinkAboutMUP22-0004 Noise StudyEnvironmental Noise and Vibration Assessment
The Barn at Pheasant Trail Ranch
Butte County, California
BAC Job # 2022-074
Prepared For:
Butte County Department of Development Services
Prepared By:
Bollard Acoustical Consultants, Inc.
Dario Gotchet, Principal Consultant
August 8, 2022
Attn: Tristan Weems
7 County Center Drive
Oroville, CA 95965
Bollard Acoustical Consultants, Inc. ● P.O. Box 7968, Auburn, CA 95604 ● Phone: (530) 537-2328 ● bacnoise.com
Bollard Acoustical Consultants, Inc. (BAC)
Environmental Noise & Vibration Assessment
The Barn at Pheasant Ranch – Butte County, California
Page 1
Introduction
The Barn at Pheasant Trail Ranch (project) is located at 4475 Nord Highway in Butte County,
California. The project applicant is requesting a minor use permit to establish a special event
facility on an existing 79.47 acre walnut ranch. Specifically, proposed events would include
wedding ceremonies and receptions, intimate gatherings, seasonal gatherings, corporate
functions, retreats, fundraisers, end of life ceremonies, specialty events and agrotourism. Events
on the property would host an average of 15 to 200 people per event with a maximum of 225
people per event. The facility would be available year-round for up to a maximum of 40 events
per year. Land uses within the immediate project vicinity include agricultural (AG-20) with
established residences in all directions. The project area with aerial imagery is shown in Figure
1. The project site plans are provided in Figures 2 and 3.
The purposes of this assessment are to quantify the existing noise and vibration environments,
identify potential noise and vibration impacts resulting from the project, identify appropriate
mitigation measures, and provide a quantitative and qualitative analysis of impacts associated
with the project. Specifically, impacts are identified if project-related activities would cause a
substantial increase in ambient noise or vibration levels at existing off-site sensitive land uses in
the project vicinity (i.e., residences), or if project-generated noise or vibration levels would exceed
applicable federal, state, or local standards at those uses.
Noise and Vibration Fundamentals
Noise
Noise is often described as unwanted sound. Sound is defined as any pressure variation in air
that the human ear can detect. If the pressure variations occur frequently enough (at least 20
times per second), they can be heard and are designated as sound. The number of pressure
variations per second is called the frequency of sound and is expressed as cycles per second, or
Hertz (Hz). Definitions of acoustical terminology are provided in Appendix A.
Measuring sound directly in terms of pressure would require a very large and awkward range of
numbers. To avoid this, the decibel scale was devised. The decibel scale uses the hearing
threshold (20 micropascals of pressure) as a point of reference, defined as 0 dB. Other sound
pressures are then compared to the reference pressure, and the logarithm is taken to keep the
numbers in a practical range. The decibel scale allows a million-fold increase in pressure to be
expressed as 120 dB. Another useful aspect of the decibel scale is that changes in decibel levels
correspond closely to human perception of relative loudness. Noise levels associated with
common noise sources are provided in Figure 4.
The perceived loudness of sounds is dependent upon many factors, including sound pressure
level and frequency content. However, within the usual range of environmental noise levels,
perception of loudness is relatively predictable and can be approximated by filtering the frequency
response of a sound level meter by means of the standardized A-weighting network. There is a
strong correlation between A-weighted sound levels (expressed as dBA) and community
response to noise. For this reason, the A-weighted sound level has become the standard tool of
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The Barn at Pheasant Ranch – Butte County, California
Page 2
environmental noise assessment. All noise levels reported in this section are in terms of
A-weighted levels.
Community noise is commonly described in terms of the ambient noise level, which is defined as
the all-encompassing noise level associated with a given noise environment. A common
statistical tool to measure the ambient noise level is the average, or equivalent, sound level (Leq).
The Leq is the foundation of the day-night average and day-evening-night average noise
descriptors, DNL and CNEL, and show very good correlation with community response to noise.
DNL and CNEL are based on the average noise level over a 24-hour day, with a +5-decibel
weighting applied to noise occurring during evening hours (CNEL only), and a 10-decibel
weighting applied to noise occurring during nighttime hours (both DNL and CNEL). Because DNL
and CNEL represent a 24-hour average, it tends to disguise short-term variations in the noise
environment.
Vibration
Vibration is like noise in that it involves a source, a transmission path, and a receiver. While
vibration is related to noise, it differs in that noise is generally considered to be pressure waves
transmitted through air, while vibration is usually associated with transmission through the ground
or structures. As with noise, vibration consists of an amplitude and frequency. A person’s
response to vibration will depend on their individual sensitivity as well as the amplitude and
frequency of the source.
Vibration can be described in terms of acceleration, velocity, or displacement. A common practice
is to monitor vibration in terms of velocity in inches per second peak particle velocity (IPS, PPV)
or root-mean-square (VdB, RMS). Standards pertaining to perception as well as damage to
structures have been developed for vibration in terms of peak particle velocity as well as RMS
velocities.
As vibrations travel outward from the source, they excite the particles of rock and soil through
which they pass and cause them to oscillate. Differences in subsurface geologic conditions and
distance from the source of vibration will result in different vibration levels characterized by
different frequencies and intensities. In all cases, vibration amplitudes will decrease with
increasing distance.
Human response to vibration is difficult to quantify. Vibration can be felt or heard well below the
levels that produce any damage to structures. The duration of the event has an effect on human
response, as does frequency. Generally, as the duration and vibration frequency increase, the
potential for adverse human response increases.
According to the Transportation and Construction-Induced Vibration Guidance Manual (Caltrans,
April 2020), operation of construction equipment and construction techniques generate ground
vibration. Traffic traveling on roadways can also be a source of such vibration. At high enough
amplitudes, ground vibration has the potential to damage structures and/or cause cosmetic
damage. Ground vibration can also be a source of annoyance to individuals who live or work
close to vibration-generating activities. However, traffic, rarely generates vibration amplitudes
high enough to cause structural or cosmetic damage.
The Barn at Pheasant Ranch
Butte County, California
Project Area
Legend
Project Border (Approximate)
Long-Term Noise & Short-Term Vibration Measurement Sites
Figure 10250500
Scale (Feet)
Event Amplified Music Simulation Measurement SitesHoslerAveAngelenaWay Orchard Blossom LnNord Hwy
F
E
D
B
C
A
2
1
3
1 2
3
4
567
5
8
9
10
Receiver –Rural Residence on Agricultural Land#
Legend
0 100 200
Scale (Feet)
The Barn at Pheasant Ranch
Butte County, California
Site Plan –On-Site Traffic Circulation
Figure 2
On-Site Traffic Circulation Route –Event Guests (One-Way)
On-Site Traffic Circulation Route –Event Staff (Two-Way)
Legend
0 25 50
Scale (Feet)
The Barn at Pheasant Ranch
Butte County, California
Site Plan –Event Facility & Parking
Figure 3
Event Facility Building
Primary Parking Area
Outdoor Ceremony Area (Lawns)
Bollard Acoustical Consultants, Inc. (BAC)
Environmental Noise & Vibration Assessment
The Barn at Pheasant Ranch – Butte County, California
Page 6
Figure 4
Noise Levels Associated with Common Noise Sources
Bollard Acoustical Consultants, Inc. (BAC)
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Page 7
Environmental Setting – Existing Ambient Noise and Vibration
Environment
Land Uses in the Project Vicinity
Noise-sensitive land uses are generally defined as locations where people reside or where the
presence of unwanted sound could adversely affect the primary intended use of the land. Places
where people live, sleep, recreate, worship and study are generally considered to be sensitive to
noise because intrusive noise can be disruptive to these activities. The nearest off-site noise-
sensitive uses which would potentially be affected by the project consist of rural residences
located on agriculturally zoned properties in all directions. The nearest residential receivers have
been identified as receivers 1 through 10 on Figure 1.
Existing Overall Ambient Noise Environment in Project Vicinity
The existing ambient noise environment in the project vicinity is defined primarily by traffic on
Nord Highway, and by nearby agricultural operations. To generally quantify existing ambient
noise environment within the project vicinity, BAC conducted long-term (96-hour) ambient noise
level measurements at three (3) locations from June 10th to 13th, 2022. The long-term noise
survey locations are shown on Figure 3. Photographs of the noise survey locations are provided
in Appendix B.
Larson Davis Laboratories (LDL) Model LxT and 820 precision integrating sound level meters
were used to complete the long-term noise level survey. The meters were calibrated immediately
before and after use with an LDL Model CA200 acoustical calibrator to ensure the accuracy of
the measurements. The equipment used meets all specifications of the American National
Standards Institute requirements for Type 1 sound level meters (ANSI S1.4). The results of the
long-term ambient noise survey are shown numerically and graphically in Appendices C and D
(respectively) and are summarized in Table 1.
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The Barn at Pheasant Ranch – Butte County, California
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Table 1
Summary of Long-Term Ambient Noise Survey Results – The Barn at Pheasant Trail Ranch1
Site Description2 Date
CNEL
(dB)
Average Measured Hourly Noise Levels (dB)3
Daytime Evening Nighttime
Leq Lmax Leq Lmax Leq Lmax
Site 1: North end of project area
6/10/22 63 57 73 55 78 56 73
6/11/22 59 55 72 55 76 51 70
6/12/22 57 55 72 54 71 49 71
6/13/22 60 58 74 52 69 52 69
Site 2: West end of project area
6/10/22 58 48 63 49 61 52 59
6/11/22 57 44 62 49 63 51 59
6/12/22 57 48 63 48 61 50 61
6/13/22 56 51 67 47 58 49 57
Site 3: South end of project area
6/10/22 50 42 64 44 64 43 55
6/11/22 52 40 60 43 58 45 54
6/12/22 53 50 65 45 61 46 60
6/13/22 51 50 65 40 61 42 58
1 Detailed summaries of the noise monitoring results are provided in Appendices C and D.
2 Long-term ambient noise monitoring locations are identified on Figure 1.
3 Daytime: 7:00 AM to 7:00 PM | Evening: 7:00 PM to 10:00 PM | Nighttime: 10:00 PM to 7:00 AM
Source: Bollard Acoustical Consultants, Inc. 2022.
BAC measurement site 1 was specifically selected to be representative of the ambient noise level
environments at residential receivers 1, 2, 3 and 10, located near Nord Highway. Noise level
measurements obtained at site 2 are believed to be representative of the ambient noise level
environments at residential receivers 4, 8 and 9, farther removed from Nord Highway located east
and west of the project parcel. Finally, BAC measurement site 3 was specifically selected to be
representative of the ambient noise level environments at residential receivers 5 through 7,
located south of the project area off Angelena Way.
As shown in Table 1, measured day-night-evening average levels (CNEL) and average measured
hourly noise levels (Leq and Lmax) were generally consistent at each individual site throughout the
96-hour monitoring period (i.e., relatively small range of values).
Existing Ambient Vibration Environment in Project Vicinity
During BAC site visits on June 9th, 2022, vibration levels were below the threshold of perception
within the project area. Nonetheless, to quantify existing vibration levels in the project vicinity,
BAC conducted short-term (10-minute) vibration measurements on June 9th, 2022, at the three
survey locations identified on Figure 1. Photographs of the vibration survey equipment are
provided in Appendix B.
A Larson-Davis Laboratories Model LxT precision integrating sound level meter equipped with a
vibration transducer was used to complete the measurements. The results are summarized in
Table 2.
Bollard Acoustical Consultants, Inc. (BAC)
Environmental Noise & Vibration Assessment
The Barn at Pheasant Ranch – Butte County, California
Page 9
Table 2
Summary of Short-Term Ambient Vibration Survey Results – June 9th, 2022
Survey Location Time
Measured Maximum
Vibration Level, PPV (in/sec)
Site 1: North end of project area 1:11 p.m. 0.024
Site 2: West end of project area 12:54 p.m. 0.023
Site 3: South end of project area 12:29 p.m. 0.017
PPV = Peak Particle Velocity (inches/second)
Source: Bollard Acoustical Consultants, Inc. 2022.
The Table 2 data indicate that measured maximum vibration levels ranged from 0.017 to 0.024
PPV in/sec.
Regulatory Setting: Criteria for Acceptable Noise and Vibration
Exposure
Federal
There are no federal noise or vibration criteria which would be directly applicable to this project.
State of California
California Environmental Quality Act (CEQA)
The State of California has established regulatory criteria that are applicable to this assessment.
Specifically, Appendix G of the State of California Environmental Quality Act (CEQA) Guidelines
are used to assess the potential significance of impacts pursuant to local General Plan policies,
Municipal Code standards, or the applicable standards of other agencies. According to Appendix
G of the CEQA guidelines, the project would result in a significant noise or vibration impact if the
following occur:
A. Generation of a substantial temporary or permanent increase in ambient noise levels in
the vicinity of the project in excess of standards established in the local general plan or
noise ordinance, or other applicable standards of other agencies.
B. Generation of excessive groundborne vibration or groundborne noise levels.
C. For a project located within the vicinity of a private airstrip or an airport land use plan or,
where such a plan has not been adopted, within two miles of a public airport or public use
airport, would the project expose people residing or working in the project area to
excessive noise levels.
It should be noted that audibility is not a test of significance according to CEQA. If this were the
case, any project which added any audible amount of noise to the environment would be
considered significant according to CEQA. Because every physical process creates noise, the
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use of audibility alone as significance criteria would be unworkable. CEQA requires a substantial
increase in noise levels before noise impacts are identified, not simply an audible change.
California Department of Transportation (Caltrans)
Butte County does not currently have adopted standards for groundborne vibration that would be
applicable to this specific project. As a result, the vibration impact criteria developed by the
California Department of Transportation (Caltrans) was applied to the project. The Caltrans
guidance criteria for building structure and vibration annoyance are presented in Tables 3 and 4,
respectively.
Table 3
Caltrans Guidance for Building Structure Vibration Criteria
Structure and Condition Limiting PPV (in/sec)
Historic and some old buildings 0.5
Residential structures 0.5
New residential structures 1.0
Industrial buildings 2.0
Bridges 2.0
PPV = Peak Particle Velocity
Source: 2020 Caltrans Transportation and Construction Vibration Guidance Manual, Table 14.
Table 4
Caltrans Guidance for Vibration Annoyance Potential Criteria
Human Response
Maximum PPV (in/sec)
Transient Sources
Continuous/Frequent
Intermittent Sources
Severe/very disturbing 2.0 0.4 to 3.6
Strongly perceptible 0.9 0.1
Distinctly perceptible 0.24 0.035
Barely/slightly perceptible 0.035 0.012
Note: Transient sources create a single isolated vibration event, such as blasting or drop balls.
Continuous/frequent sources include pile drivers, pogo-stick compactors, crack-and-seat equipment, vibratory
pile drivers and vibratory compaction equipment.
PPV = Peak Particle Velocity
Source: 2020 Caltrans Transportation and Construction Vibration Guidance Manual, Tables 4 & 6.
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Local
Butte County General Plan
The Health and Safety Element of the Butte County General Plan contains the County’s noise-
related policies. The specific policies which are generally applicable to this project are reproduced
below:
Policies
HS-P1.1 New development projects proposed in areas that exceed the land use compatibility
standards in Tables 5 and 6 (General Plan Tables HS-2 and HS-3) shall require
mitigation of noise impacts.
HS-P1.5 Noise from new recreational activities and events shall not exceed 60 dB at the nearest
noise-sensitive land use.
HS-P1.6 Applicants proposing a new noise-producing development project near existing or
planned noise-sensitive uses shall provide a noise analysis prepared by an acoustical
specialist with recommendations for design mitigation.
Table 5
Maximum Allowable Noise Exposure to
Transportation Noise Sources
Land Use
Exterior Noise Level
Standard for Outdoor
Activity Areas (dBA)1
Interior Noise Level
Standard (dBA)
DNL Leq DNL Leq (dB)2
Residential 603 -- 45 --
Transient Lodging 603 -- 45 --
Hospitals, Nursing Homes 603 -- 45 --
Theaters, Auditoriums, Music Halls -- -- -- 35
Churches 603 -- -- 40
Office Buildings -- -- -- 45
Schools, Libraries, Museums -- 70 -- 45
Playgrounds, Neighborhood Parks -- 70 -- --
Notes:
1 Where the location of outdoor activity areas is unknown, the exterior noise level standard shall be applied to
the property line of the receiving land use.
2 As determined for a typical worst-case hour during period of use.
3 Where it is not possible to reduce noise in outdoor activity areas to 60 dB DNL or less using a practical
application of the best-available noise reduction measures, an exterior noise level of up to 65 dB DNL may be
allowed provided that available exterior noise level reduction measures have been implemented and interior
noise levels are in compliance with this table.
Source: Butte County General Plan, Health and Safety Element, Table HS-2.
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Table 6
Maximum Allowable Noise Exposure to
Non-Transportation Sources
Noise Descriptor
Day (7am – 7pm) Evening (7pm – 10 pm) Night (10 pm – 7 am)
Designation
Urban
Non-
Urban Urban
Non-
Urban Urban
Non-
Urban
Hourly Average (Leq) 55 50 50 45 45 40
Maximum (Lmax) 70 60 60 55 55 50
Notes:
1 “Non-Urban designations” are Agriculture, Timber Mountain, Resource Conservation, Foothill Residential and
Rural Residential. All other designations are considered “urban designations” for the purposes of regulating
noise exposure.
2 Each of the noise levels specified above shall be lowered by 5 dB for simple tone noises, noises consisting
primarily of speech or music, or for recurring impulsive noises. These noise level standards do not apply to
residential units established in conjunction with industrial or commercial uses (e.g., caretaker dwellings).
3 The County can impose noise level standards which are up to 5 dB less than those specified above based upon
determination of existing low ambient noise levels in the vicinity of the project site.
4 In urban areas, the exterior noise level standard shall be applied to the property line of the receiving property. In
rural areas, the exterior noise level standard shall be applied at a point 100 feet away from the residence. The
above standards shall be measured only on property containing a noise sensitive land use. This measurement
standard may be amended to provide for measurement at the boundary of a recorded noise easement between
all affected property owners and approved by the County.
Source: Butte County General Plan, Health and Safety Element, Table HS-3.
Butte County Code of Ordinances
The provisions of the Butte County Code of Ordinances which would be most applicable to this
project are reproduced below.
41A-7 Exterior noise standards.
a) The following noise standards (reproduced in Table 7 of this report), unless otherwise
specifically indicated in this chapter, shall apply to all noise sensitive exterior areas within
Butte County.
Table 7
Butte County Code of Ordinances – Exterior Noise Level Standards
Noise Descriptor
Day (7am – 7pm) Evening (7pm – 10 pm) Night (10 pm – 7 am)
Designation
Urban
Non-
Urban Urban
Non-
Urban Urban
Non-
Urban
Hourly Average (Leq) 55 50 50 45 45 40
Maximum (Lmax) 70 60 60 55 55 50
Source: Butte County Code of Ordinances, Section 41A-7.
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b) It is unlawful for any person at any location within the County to create any noise which
causes the noise levels on an affected property, when measured in the designated exterior
location, to exceed the noise standards specified above (Table 7).
c) Each of the noise limits specified in subdivision (a) of this section shall be reduced by five
(5) dBA for recurring impulsive noise, simple or pure tone noise, or for noises consisting
of speech or music.
d) Noise level standards, which are up to five (5) dBA less than those specified above, based
upon determination of existing low ambient noise levels in the vicinity of the project site
may be imposed.
e) In urban areas, the exterior noise level standard shall be applied to the property line of the
receiving property. In non-urban areas, the exterior noise level standard shall be applied
at a point one hundred (100) feet away from the residence or at the property line if the
residence is closer than one hundred (100) feet. The above standards shall be measured
only on property containing a noise sensitive land use.
41A-8 Interior noise standards.
a) The following noise standards (reproduced in Table 8 of this report), unless otherwise
specifically indicated in this chapter, shall apply to all noise-sensitive interior areas within
Butte County.
Table 8
Butte County Code of Ordinances – Interior Noise Level Standards
Noise Level Descriptor
Daytime
(7am – 7pm)
Evening
(7pm – 10 pm)
Nighttime
(10 pm – 7 am)
Hourly Average (Leq) 45 40 35
Maximum (Lmax) 60 55 50
Source: Butte County Code of Ordinances, Section 41A-8
b) It is unlawful for any person at any location within the County to create any noise which
causes the noise levels on an affected property, when measured in the designated interior
noise-sensitive area, to exceed the noise standards specified above (Table 8).
c) Each of the noise limits specified in subdivision (a) of this section shall be reduced by five
(5) dBA for recurring impulsive noise, simple or pure tone noise, or for noises consisting
of speech or music.
Discussion of County Noise Level Criteria Applied to Proposed On-Site Activities
The Butte County General Plan and Code of Ordinances establish exterior noise levels limits for
non-transportation noise sources affecting noise-sensitive uses that are identical to each other.
However, the Code of Ordinances also establishes interior noise level limits for non-transportation
noise sources affecting the interior areas of noise-sensitive uses. Thus, compliance with the Code
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of Ordinances exterior and interior noise level limits presented in Tables 7 and 8 of this report
would ensure satisfaction of the General Plan noise criteria.
The Code of Ordinances exterior noise standards shown in Table 7 are provided in terms of hourly
average (Leq) and maximum (Lmax) noise descriptors for daytime (7:00 a.m. to 7:00 p.m.), evening
(7:00 p.m. to 10:00 p.m.) and nighttime (10:00 p.m. to 7:00 a.m.) periods. The standards are
further categorized under “Urban” and “Non-Urban” headings. According to the Butte County GIS
online viewer, the project parcel and adjacent parcels which contain noise-sensitive uses
(residences) are agriculturally zoned (AG-20). Pursuant to this zoning, the County’s noise criteria
for “non-urban” land uses would be applicable to on-site project noise sources.
It should be noted that the County’s interior noise level standards shown in Table 8 are 5 to 10
dB lower than the County’s exterior noise level limits shown in Table 7. Observation of the existing
residential structures in the project vicinity (receivers 1 through 10 on Figure 1) indicates that the
exterior building facades appear to be in relatively good condition. As a result, the estimated
noise reduction of the building facades would be approximately 25 dB with windows closed and
10-15 dB with windows open. Therefore, compliance with the County’s exterior noise level
standards shown in Table 7 would ensure compliance with the County’s interior noise level
standards shown in Table 8. Considering this information, the impact discussions pertaining to
noise from proposed on-site activities focus on compliance with the County’s exterior noise
standards at the nearest identified existing residences (receivers 1 through 10 on Figure 1).
Finally, the primary noise sources associated with proposed event facility activities have been
identified as on-site vehicle circulation, parking area movements, event amplified music/speech,
and event crowd noise. Pursuant to Section 41A-7(c) of the Code of Ordinances, the County’s
exterior noise standards shall be reduced by five (5) dBA for noises consisting of primarily speech
or music. According to conversations with Butte County Department of Development of Services
staff in recent years, the 5 dB downward adjustment would be applicable to proposed outdoor
event amplified music/speech, but not event crowd noise. In addition, it is the understanding of
BAC that all events held on the project property would be held during daytime (7:00 a.m. to 7:00
p.m.) and/or evening hours (i.e., 7:00 p.m. to 10:00 p.m.). No event activities are proposed during
nighttime hours (i.e., 10:00 p.m. to 7:00 a.m.). As a result, the County’s daytime and evening
noise level standards would be applicable to the project.
Based on the proposed event operations information above, and pursuant to criteria established
in the Code of Ordinances, the following noise level standards presented in Table 9 were applied
to proposed on-site project activities and assessed at the nearest identified existing residences
(receivers 1 through 10 on Figure 1). The County’s noise standards shall be applied at a point
100 feet away from residences in rural (i.e., non-urban) areas.
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Table 9
County Code of Ordinances Non-Urban Exterior Noise Standards Applied to the Project1
Noise Source
Unadjusted Noise Standards
(dB)
Applied Noise Level Standards
(dB)1
Daytime Evening Daytime Evening
Leq Lmax Leq Lmax Leq Lmax Leq Lmax
On-Site Vehicle Circulation 50 60 45 55 50 60 45 55
Parking Area Movements 50 60 45 55 50 60 45 55
Crowd Noise 50 60 45 55 50 60 45 55
Amplified Music/Speech 50 60 45 55 45 55 40 50
1 The County’s exterior noise standards for event amplified music/speech are 5 dB lower per County Code criteria.
Impacts and Mitigation Measures
Thresholds of Significance
For the purposes of this assessment, a noise and vibration impact is considered significant if the
project would result in:
Generation of a substantial temporary or permanent increase in ambient noise levels in
the vicinity of the project in excess of standards established in the local general plan or
noise ordinance, or other applicable standards of other agencies; or
Generation of excessive groundborne vibration or groundborne noise levels; or
For a project located within the vicinity of a private airstrip or an airport land use plan or,
where such a plan has not been adopted, within two miles of a public airport or public use
airport, would the project expose people residing or working in the project area to
excessive noise levels.
The project site is not within the vicinity of a private airstrip, an airport land use plan, or within two
miles of a public airport. Therefore, the last threshold listed above is not discussed further.
The following criteria based on standards established by the California Department of
Transportation (Caltrans), Butte County General Plan and Code of Ordinances were used to
evaluate the significance of environmental noise and vibration resulting from the project:
A significant noise impact would be identified if the project would expose persons to or
generate noise levels that would exceed applicable noise standards presented in the Butte
County General Plan or Code of Ordinances.
A significant impact would be identified if project-generated on-site activities would
substantially increase noise levels at existing sensitive receptors in the vicinity. In terms
of determining the noise increase due to those activities, an impact would occur if those
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activities would noticeably increase ambient noise levels above background levels. The
threshold of perception of the human ear is approximately 3 to 5 dB – a 5 dB change is
considered to be clearly noticeable. For the analysis of project on-site activity noise level
increases, a noticeable increase in ambient noise levels is assumed to occur where those
activities would result in an increase by 5 dB or more over existing ambient noise levels.
A significant impact would be identified if proposed on-site activities would expose noise-
sensitive receptors to excessive groundborne vibration levels. Specifically, an impact
would be identified if groundborne vibration levels due to these sources would exceed the
Caltrans vibration impact criteria.
Noise Impacts Associated with Project-Generated Increases in Off-Site Traffic
Impact 1: Increases in Traffic Noise Levels due to the Project
It is the understanding of BAC that based on the estimated trip generation of the project, Butte
County planning staff has determined that a traffic study was is not warranted. Based on the
estimated trip generation, changes in ambient noise levels resulting from project-generated traffic
within the project roadway network would not be appreciable (i.e., well below a 5 dB increase).
Based on this information, this impact is identified as being less than significant.
Noise Impacts Associated with Proposed On-Site Event Activities
As mentioned previously, the primary noise sources associated with proposed event facility
activities have been identified as on-site vehicle circulation, parking area movements, event
amplified music/speech, and event crowd noise. The project site plans show the proposed
locations of on-site vehicle circulation route, primary parking area, event facility building (barn)
and outdoor ceremony/gathering area (Figures 2 and 3). An assessment of each identified
project-related noise source at the nearest existing off-site residences follows.
For noise generated by on-site activities, the County’s exterior noise level standards provided in
Table 9 were applied to the project. The County’s noise standards shall be applied at a point 100
feet away from residences in rural (i.e., non-urban) areas. In terms of determining the noise level
increase due to on-site noise sources, an impact would occur if those sources would noticeably
increase ambient noise levels above background levels. The threshold of perception of the
human ear is approximately 3 to 5 dB – a 5 dB change is considered to be clearly noticeable. For
the following analyses of on-site noise sources, a noticeable increase in ambient noise levels is
assumed to occur where noise levels increase by 5 dB or more over existing ambient noise levels
at nearby existing residences.
Impact 2: On-Site Event Vehicle Circulation Noise at Existing Off-Site Residences
According to the project site plans, event traffic will enter the property from the north end of the
project parcel off Nord Highway. Once on site, vehicles will travel south towards the event facility
building and parking area on a private road. All event traffic will exit the facility via a one-way
private road that leads back out to Nord Highway (north) along the western project property line.
The on-site event traffic circulation route is shown on Figure 2.
Bollard Acoustical Consultants, Inc. (BAC)
Environmental Noise & Vibration Assessment
The Barn at Pheasant Ranch – Butte County, California
Page 17
The Federal Highway Administration Highway Traffic Noise Prediction Model (FHWA RD-77-108)
was utilized to determine worst-case on-site event vehicle circulation noise generated by a
maximum capacity event (225-person) event upon the nearest identified residential receivers.
Assuming an on-site vehicle speed of less than 25 mph, 100 vehicle passbys in a worst-case
busy daytime or evening hour (conservative estimate), the FHWA Model was used to predict
event-generated on-site traffic noise levels at the nearest off-site residences (receivers 1 through
10). The results of those predictions relative to the applicable Butte County exterior daytime and
evening noise level standards are presented in Table 10.
It should be noted that the proposed traffic flow plan (Figure 2) also shows an on-site traffic
circulation route associated with event staff and service use only. However, the following analysis
focuses on worst-case project-generated on-site traffic circulation, which would be associated
with event traffic.
Table 10
Predicted Worst-Case On-Site Event Traffic Noise Levels at Existing Off-Site Residences
Receiver1
Distance from On-Site
Circulation Route (ft)2
Predicted Noise Levels (dB)3
Leq Lmax
1 100 42 52
2 175 39 49
3 1,250 26 36
4 850 28 38
5 1,850 23 33
6 1,880 23 33
7 2,000 23 33
8 575 31 41
9 500 32 42
10 400 33 43
County Daytime Exterior Noise Standards (dB) 50 60
County Evening Exterior Noise Standards (dB) 45 55
1 Receiver locations are shown on Figure 1.
2 Distances scaled from nearest portion of on-site circulation route to a point 100’ feet from residences.
3 Predicted Lmax noise levels conservatively estimated to be 10 dB higher than predicted Leq noise levels.
Source: Bollard Acoustical Consultants, Inc. 2022.
As shown in Table 10, worst-case on-site event traffic noise exposure is predicted to comply with
the applicable Butte County daytime and evening hourly average (Leq) and maximum (Lmax)
exterior noise level standards at the nearest residential receivers.
Table 1 of this report summarizes the results from the BAC long-term ambient noise survey. Using
the lowest measured hourly daytime and evening noise levels presented in Table 1, ambient plus
project on-site vehicle circulation noise level increases were calculated at the nearest residential
receivers and the results of those calculations are presented in Tables 11 through 14.
Bollard Acoustical Consultants, Inc. (BAC)
Environmental Noise & Vibration Assessment
The Barn at Pheasant Ranch – Butte County, California
Page 18
Table 11
Ambient Plus Project On-Site Event Traffic Noise Level Increases at Receivers – Daytime Leq
Receiver
Predicted Noise
Level, Leq (dB)1
Daytime Ambient Plus
Project, Leq (dB)2
Increase in Daytime
Ambient, Leq (dB)3
1 42 55.2 0.2
2 39 55.1 0.1
3 26 55.0 <0.1
4 28 44.1 0.1
5 23 40.1 0.1
6 23 40.1 0.1
7 23 40.1 0.1
8 31 44.2 0.2
9 32 44.2 0.2
10 33 55.0 <0.1
1 Predicted noise levels from Table 10.
2 Sum of predicted and measured ambient noise levels.
3 Calculated increase in ambient noise levels.
Source: Bollard Acoustical Consultants, Inc. 2022.
Table 12
Ambient Plus Project On-Site Event Traffic Noise Level Increases at Receivers – Evening Leq
Receiver
Predicted Noise
Level, Leq (dB)1
Evening Ambient Plus
Project, Leq (dB)2
Increase in Evening
Ambient, Leq (dB)3
1 42 52.4 0.4
2 39 52.2 0.2
3 26 52.0 <0.1
4 28 47.1 0.1
5 23 40.1 0.1
6 23 40.1 0.1
7 23 40.1 0.1
8 31 47.1 0.1
9 32 47.1 0.1
10 33 52.1 0.1
1 Predicted noise levels from Table 10.
2 Sum of predicted and measured ambient noise levels.
3 Calculated increase in ambient noise levels.
Source: Bollard Acoustical Consultants, Inc. 2022.
Bollard Acoustical Consultants, Inc. (BAC)
Environmental Noise & Vibration Assessment
The Barn at Pheasant Ranch – Butte County, California
Page 19
Table 13
Ambient Plus Project On-Site Event Traffic Noise Level Increases at Receivers – Daytime Lmax
Receiver
Predicted Noise
Level, Lmax (dB)1
Daytime Ambient Plus
Project, Lmax (dB)2
Increase in Daytime
Ambient, Lmax (dB)3
1 52 72.0 <0.1
2 49 72.0 <0.1
3 36 72.0 <0.1
4 38 62.0 <0.1
5 33 60.0 <0.1
6 33 60.0 <0.1
7 33 60.0 <0.1
8 41 62.0 <0.1
9 42 62.0 <0.1
10 43 72.0 <0.1
1 Predicted noise levels from Table 10.
2 Sum of predicted and measured ambient noise levels.
3 Calculated increase in ambient noise levels.
Source: Bollard Acoustical Consultants, Inc. 2022.
Table 14
Ambient Plus Project On-Site Event Traffic Noise Level Increases at Receivers – Evening Lmax
Receiver
Predicted Noise
Level, Lmax (dB)1
Evening Ambient Plus
Project, Lmax (dB)2
Increase in Evening
Ambient, Lmax (dB)3
1 52 69.1 0.1
2 49 69.0 <0.1
3 36 69.0 <0.1
4 38 58.0 <0.1
5 33 58.0 <0.1
6 33 58.0 <0.1
7 33 58.0 <0.1
8 41 58.1 0.1
9 42 58.1 0.1
10 43 69.0 <0.1
1 Predicted noise levels from Table 10.
2 Sum of predicted and measured ambient noise levels.
3 Calculated increase in ambient noise levels.
Source: Bollard Acoustical Consultants, Inc. 2022.
As indicated in Tables 11 through 14, the increases in ambient noise levels from worst-case
project-generated on-site event vehicle circulation are calculated to be well below the applied
significance criterion of 5 dB. Because noise exposure from worst-case project on-site event
vehicle circulation is predicted to satisfy applicable Butte County daytime and evening exterior
noise level standards at the nearest existing residential uses, and because noise exposure from
Bollard Acoustical Consultants, Inc. (BAC)
Environmental Noise & Vibration Assessment
The Barn at Pheasant Ranch – Butte County, California
Page 20
those activities is not calculated to significantly increase ambient daytime or evening noise levels
at those uses, this impact is identified as being less than significant.
Impact 3: Event Parking Area Noise at Existing Off-Site Residences
The project proposes the development of one primary parking area for events, centrally located
on the project parcel north of the barn building. The location of the proposed primary parking
area is shown on Figure 3.
As a means of determining potential noise exposure due to event parking lot activities, Bollard
Acoustical Consultants, Inc. (BAC) utilized specific parking lot noise level measurements
conducted by BAC. Specifically, a series of individual noise measurements were conducted of
multiple vehicle types arriving and departing a parking area, including engines starting and
stopping, car doors opening and closing, and persons conversing as they entered and exited the
vehicles. The results of those measurements revealed that individual parking lot movements
generated mean noise levels of approximately 70 dB SEL at a reference distance of 50 feet. The
maximum noise level associated with parking lot activity typically did not exceed 65 dB Lmax at
the same reference distance.
To compute hourly average (Leq) noise levels generated by parking lot activities, the approximate
number of hourly operations in any given area and distance to the effective noise center of those
activities is required. Based on the project site plan, approximately 75 parking spaces stalls will
be constructed within the primary parking area. It was conservatively assumed for the purposes
of this analysis that all stalls within the parking area could fill or empty during a given peak daytime
or evening hour (worst-case). The hourly average noise level generated by parking lot
movements is computed using the following formula:
Peak Hour Leq = 70+10*log (N) – 35.6
Where 70 is the mean Sound Exposure Level (SEL) for an automobile parking lot arrival or
departure, N is the number of parking lot operations in a given hour, and 35.6 is 10 times the
logarithm of the number of seconds in an hour.
Using the information provided above, the provided site plans (for scaling distances), and
assuming standard spherical spreading loss (-6 dB per doubling of distance), worst-case event
parking activity noise exposure at the nearest existing off-site residences (receivers 1 through 10)
was calculated and the results of those calculations relative to the applicable Butte County exterior
daytime and evening noise level standards are presented in Table 15.
Bollard Acoustical Consultants, Inc. (BAC)
Environmental Noise & Vibration Assessment
The Barn at Pheasant Ranch – Butte County, California
Page 21
Table 15
Predicted Worst-Case Event Parking Area Noise Levels at Existing Off-Site Residences
Receiver1
Distance from Parking
Area (ft)2
Predicted Noise Levels (dB)
Leq Lmax
1 900 28 45
2 850 29 45
3 1,600 23 40
4 900 28 45
5 2,000 21 38
6 2,050 21 38
7 2,300 20 37
8 1,100 26 43
9 1,100 26 43
10 1,050 27 44
County Daytime Exterior Noise Standards (dB) 50 60
County Evening Exterior Noise Standards (dB) 45 55
1 Receiver locations are shown on Figure 1.
2 Distances scaled from primary parking area to a point 100’ feet from residences.
Source: Bollard Acoustical Consultants, Inc. 2022.
The Table 15 data indicate that worst-case event parking area noise exposure is predicted to
comply with the applicable Butte County daytime and evening hourly average (Leq) and maximum
(Lmax) exterior noise level standards at the nearest residential receivers.
Table 1 of this report summarizes the results from the BAC long-term ambient noise survey. Using
the lowest measured hourly daytime and evening noise levels presented in Table 1, ambient plus
project event parking noise level increases were calculated at the nearest residential receivers
and the results of those calculations are presented in Tables 16 through 19.
Bollard Acoustical Consultants, Inc. (BAC)
Environmental Noise & Vibration Assessment
The Barn at Pheasant Ranch – Butte County, California
Page 22
Table 16
Ambient Plus Project Event Parking Noise Level Increases at Receivers – Daytime Leq
Receiver
Predicted Noise
Level, Leq (dB)1
Daytime Ambient Plus
Project, Leq (dB)2
Increase in Daytime
Ambient, Leq (dB)3
1 28 55.0 <0.1
2 29 55.0 <0.1
3 23 55.0 <0.1
4 28 44.1 0.1
5 21 40.1 0.1
6 21 40.1 0.1
7 20 40.0 <0.1
8 26 44.1 0.1
9 26 44.1 0.1
10 27 55.0 <0.1
1 Predicted noise levels from Table 15.
2 Sum of predicted and measured ambient noise levels.
3 Calculated increase in ambient noise levels.
Source: Bollard Acoustical Consultants, Inc. 2022.
Table 17
Ambient Plus Project Event Parking Noise Level Increases at Receivers – Evening Leq
Receiver
Predicted Noise
Level, Leq (dB)1
Evening Ambient Plus
Project, Leq (dB)2
Increase in Evening
Ambient, Leq (dB)3
1 28 52.0 <0.1
2 29 52.0 <0.1
3 23 52.0 <0.1
4 28 47.1 0.1
5 21 40.1 0.1
6 21 40.1 0.1
7 20 40.0 <0.1
8 26 47.0 <0.1
9 26 47.0 <0.1
10 27 52.0 <0.1
1 Predicted noise levels from Table 15.
2 Sum of predicted and measured ambient noise levels.
3 Calculated increase in ambient noise levels.
Source: Bollard Acoustical Consultants, Inc. 2022.
Bollard Acoustical Consultants, Inc. (BAC)
Environmental Noise & Vibration Assessment
The Barn at Pheasant Ranch – Butte County, California
Page 23
Table 18
Ambient Plus Project Event Parking Noise Level Increases at Receivers – Daytime Lmax
Receiver
Predicted Noise
Level, Lmax (dB)1
Daytime Ambient Plus
Project, Lmax (dB)2
Increase in Daytime
Ambient, Lmax (dB)3
1 45 72.0 <0.1
2 45 72.0 <0.1
3 40 72.0 <0.1
4 45 62.1 0.1
5 38 60.0 <0.1
6 38 60.0 <0.1
7 37 60.0 <0.1
8 43 62.1 0.1
9 43 62.1 0.1
10 44 72.0 <0.1
1 Predicted noise levels from Table 15.
2 Sum of predicted and measured ambient noise levels.
3 Calculated increase in ambient noise levels.
Source: Bollard Acoustical Consultants, Inc. 2022.
Table 19
Ambient Plus Project Event Parking Noise Level Increases at Receivers – Evening Lmax
Receiver
Predicted Noise
Level, Lmax (dB)1
Evening Ambient Plus
Project, Lmax (dB)2
Increase in Evening
Ambient, Lmax (dB)3
1 45 69.0 <0.1
2 45 69.0 <0.1
3 40 69.0 <0.1
4 45 58.2 0.2
5 38 58.0 <0.1
6 38 58.0 <0.1
7 37 58.0 <0.1
8 43 58.1 0.1
9 43 58.1 0.1
10 44 69.0 <0.1
1 Predicted noise levels from Table 15.
2 Sum of predicted and measured ambient noise levels.
3 Calculated increase in ambient noise levels.
Source: Bollard Acoustical Consultants, Inc. 2022.
As shown in Tables 16 through 19, the increases in ambient noise levels from worst-case event
parking activities are calculated to be well below the applied significance criterion of 5 dB.
Because noise exposure from worst-case project event parking movements is predicted to satisfy
applicable Butte County daytime and evening exterior noise level standards at the nearest existing
residential uses, and because noise exposure from those activities is not calculated to significantly
Bollard Acoustical Consultants, Inc. (BAC)
Environmental Noise & Vibration Assessment
The Barn at Pheasant Ranch – Butte County, California
Page 24
increase ambient daytime or evening noise levels at those uses, this impact is identified as being
less than significant.
Impact 4: Event Amplified Music/Speech at Existing Off-Site Residences
The project proposes to have amplified music/speech during events held on the property.
According to the project applicant, the event sound system setup would be located within the barn
building. It is the understanding of BAC that amplified speech/music will also occur within the
outdoor area during ceremonies. The location of the barn building, and outdoor ceremony area
are shown on Figure 2.
To quantify the noise levels generated from project-generated amplified music/speech, BAC
conducted short-term noise level measurements on Thursday, June 9th, 2022, during a simulated
event with amplified music. Larson Davis Laboratories Models LxT and 831 precision integrating
sound level meters were used for the noise level measurements during the amplified music
simulation. The meters were calibrated before use and placed on a tripod 5 feet above ground at
six (6) locations, identified as sites A through F on Figure 1. The measurement locations were
intended to quantify event music noise exposure in the directions of the nearest existing off-site
residences (receivers 1 through 10).
The sound system was set to produce sound levels typical of what would be produced by amplified
music playing within the barn at an event. The simulation utilized a reference music level of 80
dB (average) at a distance of 50 feet from the speakers. While music was being played, short-
term noise level measurements were conducted at the reference position 50 feet in front of the
speakers, as well as at sites A through F. This reference was selected because BAC believes
that it is a conservative level at which amplified music within the barn could occur during an event.
The sound system placement and speaker orientation (i.e., set back within the barn with north-
facing speakers) were based on information provided by the project applicant and is the likely
speaker orientation during an event. Appendix B shows photographs of the sound system setup
and measurement locations.
The simulation consisted of playing digital recordings of typical music which might be used during
an event using four 1,100-Watt Yamaha DXR12 speakers and a 950-Watt Yamaha DXS15
subwoofer, all with built-in amplifiers, and an MP3 player as the music source. As mentioned
previously, the sound system speakers were positioned and directionally oriented where the event
music setup would typically be positioned at events. The music simulation was conducted both
with the barn doors in the open and closed positions. Table 20 summarizes the noise level
measurement results.
Bollard Acoustical Consultants, Inc. (BAC)
Environmental Noise & Vibration Assessment
The Barn at Pheasant Ranch – Butte County, California
Page 25
Table 20
Summary of Event Music Simulation Noise Measurement Results – June 9th, 2022
Site1 Location Description Leq Lmax Observations
Ref. 50 ft south of speakers 80 85 Typical levels of music at events
Barn Doors Closed
A 1,050 ft northwest of speakers 56 66 Music inaudible over traffic
B 1,050 ft northeast of speakers 64 73 Music inaudible over traffic
C 680 ft east of speakers 49 66 Music inaudible, distant traffic
D 1,500 ft south of speakers 48 66 Music inaudible, birds, sprinklers
E 900 ft southwest of speakers 49 64 Music barely audible, not measurable above ambient
F 550 ft west of speakers 44 57 Music barely audible, not measurable above ambient
Barn Doors Open
A 1,050 ft northwest of speakers 58 68 Music inaudible over traffic
B 1,050 ft northeast of speakers 61 71 Music inaudible over traffic
C 680 ft east of speakers 47 57 Music inaudible
D 1,500 ft south of speakers 44 56 Music barely audible, not measurable above ambient
E 900 ft southwest of speakers 48 62 Music barely audible, not measurable above ambient
F 550 ft west of speakers 49 67 Music barely audible, not measurable above ambient
1 Measurement locations are shown on Figure 1.
Source: Bollard Acoustical Consultants, Inc. 2022.
The event simulation results shown in Table 20 were measured near the project property
boundaries in the direction of receivers 1 through 10. To predict amplified event noise levels at
those receivers, BAC extrapolated the Table 20 data to a point 100 feet from the residential
receiver assuming a decrease of 6 dB per doubling of distance from the noise source (consistent
with accepted sound propagation algorithms). The results of those projections relative to the
applicable Butte County exterior daytime and evening noise level limits are summarized in Table
21.
It should be noted that amplified music/speech may also occur within the outdoor lawn area during
ceremonies. Specifically, it is our understanding that the amplified music/speech within this
outdoor area would be limited to light ceremony music and/or a person speaking during a
ceremony from a smaller speaker system. Based on the size of the outdoor ceremony area and
given the nature of the amplified music/speech that would occur there (i.e., normal speaking voice
from an event officiant and/or light ceremony music), BAC believes that amplified music/speech
from within the lawn area could occur at a reference noise level of 60 dB (average) at 50 feet.
Based on the above information, it is reasonable to assume that the loudest amplified
music/speech on the property would be associated with event receptions/celebrations within the
barn building – which was simulated by BAC using a reference noise level of 80 dB (average) at
50 feet. Thus, compliance with louder event amplified music/speech from within the barn building
at the nearest residences would ensure compliance with quieter event music/speech within the
nearby outdoor ceremony area.
Bollard Acoustical Consultants, Inc. (BAC)
Environmental Noise & Vibration Assessment
The Barn at Pheasant Ranch – Butte County, California
Page 26
Table 21
Predicted Event Amplified Music/Speech Noise Levels at Existing Off-Site Residences
Receiver1 Distance from Sound System (ft)2
Projected Noise Levels (dB)
Leq Lmax
1 1,150 52 62
2 1,100 61 70
3 1,800 56 65
4 900 40 57
5 1,750 41 59
6 1,700 42 60
7 2.000 37 52
8 1,000 34 47
9 1,000 34 47
10 1,200 33 46
Adjusted County Daytime Exterior Noise Standards (dB) 45 55
Adjusted County Evening Exterior Noise Standards (dB) 40 50
1 Receiver locations are shown on Figure 1.
2 Distances scaled from sound system to a point 100’ feet from residences.
3 Predicted noise levels in open door configuration and include offsets for building shielding where applicable.
Source: Bollard Acoustical Consultants, Inc. 2022.
Using the extrapolated event music simulation measurement data presented in Table 20 (BAC
simulation measurements), amplified event music is projected to exceed the adjusted Butte
County daytime and evening hourly average (Leq) and maximum (Lmax) exterior noise level
standards at portions of the nearest residential receivers. However, BAC staff observations
indicate that amplified music/speech ranged from completely inaudible to barely audible (not
measurable above ambient) at the measurement sites during the BAC amplified simulation and
noted that other noise sources significantly contributed to the data (e.g., traffic, birds, sprinklers,
etc.).
When projecting reference sound system noise levels of 80 dB (average) and 85 dB (maximum)
at 50 feet to the nearest residential receivers and excluding consideration of the BAC simulation
measurement data determined to be influenced by other noise sources, event amplified
music/speech could potentially exceed the adjusted County daytime and evening hourly average
(Leq) and maximum (Lmax) exterior noise level standards at a portion of the nearest residential
receivers. As a result, this impact is identified as being potentially significant.
Mitigation Impact 4:
To avoid the potential for an exceedance of the adjusted Butte County daytime and evening hourly
average (Leq) and maximum (Lmax) exterior noise level standards at the nearest existing off-site
residences, and to avoid the potential for substantial increases in ambient noise levels at those
locations, the following noise abatement measures should be implemented:
Bollard Acoustical Consultants, Inc. (BAC)
Environmental Noise & Vibration Assessment
The Barn at Pheasant Ranch – Butte County, California
Page 27
MM-4A: Overall average sound levels from amplified music/speech within the barn building
should not exceed 70 dBA at a point 50 feet in front of the speakers.
Table 22 shows the predicted event amplified music noise levels after
implementation of MM-4A, as outlined above. As shown in Table 22,
implementation of MM-4A is predicted to result in compliance with the adjusted
Butte County daytime and evening hourly average (Leq) and maximum (Lmax)
exterior noise level standards at residential receivers 1 through 10.
Table 22
Predicted Event Amplified Music Noise Levels – Mitigated
Receiver1
Predicted Mitigated
Noise Levels (dB)1
Adjusted County Noise Standards (dB)
Daytime Evening
Leq Lmax Leq Lmax Leq Lmax
1 40 45
45 55 40 50
2 40 45
3 36 41
4 38 43
5 34 39
6 34 39
7 33 38
8 39 44
9 39 44
10 39 44
1 Predicted noise levels with implementation of MM-4A.
Source: Bollard Acoustical Consultants, Inc. 2022.
Table 1 of this report summarizes the results from the BAC long-term ambient
noise survey. Using the lowest measured hourly daytime and evening noise levels
presented in Table 1, ambient plus project event amplified music noise level
increases after implementation of MM-4A were calculated at the nearest residential
receivers and the results of those calculations are presented in Tables 22 through
25. As indicated in Tables 22 through 25, the increases in ambient noise levels
from project event amplified music are calculated to be well below the applied
significance criterion of 5 dB.
Bollard Acoustical Consultants, Inc. (BAC)
Environmental Noise & Vibration Assessment
The Barn at Pheasant Ranch – Butte County, California
Page 28
Table 22
Ambient Plus Project Event Music Noise Level Increases – Daytime Leq
Receiver1
Predicted Noise Level,
Leq (dB)1
Daytime Ambient
Plus Project, Leq
(dB)2
Increase in
Daytime Ambient,
Leq (dB)3
1 40 55.1 0.1
2 40 55.1 0.1
3 36 55.1 0.1
4 38 45.0 1.0
5 34 41.0 1.0
6 34 41.1 1.1
7 33 40.8 0.8
8 39 45.2 1.2
9 39 45.2 1.2
10 39 55.1 0.1
1 Predicted mitigated noise levels from Table 21.
2 Sum of predicted and measured ambient noise levels.
3 Calculated increase in ambient noise levels.
Source: Bollard Acoustical Consultants, Inc. 2022.
Table 23
Ambient Plus Project Event Music Noise Level Increases – Evening Leq
Receiver1
Predicted Noise Level,
Leq (dB)1
Evening Ambient
Plus Project, Leq
(dB)2
Increase in
Evening Ambient,
Leq (dB)3
1 40 52.3 0.3
2 40 52.3 0.3
3 36 52.1 0.1
4 38 47.5 0.5
5 34 41.0 1.0
6 34 41.1 1.1
7 33 40.8 0.8
8 39 47.6 0.6
9 39 47.6 0.6
10 39 52.2 0.2
1 Predicted mitigated noise levels from Table 21.
2 Sum of predicted and measured ambient noise levels.
3 Calculated increase in ambient noise levels.
Source: Bollard Acoustical Consultants, Inc. 2022.
Bollard Acoustical Consultants, Inc. (BAC)
Environmental Noise & Vibration Assessment
The Barn at Pheasant Ranch – Butte County, California
Page 29
Table 24
Ambient Plus Project Event Music Noise Level Increases – Daytime Lmax
Receiver1
Predicted Noise Level,
Lmax (dB)1
Daytime Ambient
Plus Project, Lmax
(dB)2
Increase in
Daytime Ambient,
Lmax (dB)3
1 45 72.0 <0.1
2 45 72.0 <0.1
3 41 72.0 <0.1
4 43 62.1 0.1
5 39 60.0 <0.1
6 39 60.0 <0.1
7 38 60.0 <0.1
8 44 62.1 0.1
9 44 62.1 0.1
10 44 72.0 <0.1
1 Predicted mitigated noise levels from Table 21.
2 Sum of predicted and measured ambient noise levels.
3 Calculated increase in ambient noise levels.
Source: Bollard Acoustical Consultants, Inc. 2022.
Table 25
Ambient Plus Project Event Music Noise Level Increases – Evening Lmax
Receiver1
Predicted Noise Level,
Lmax (dB)1
Evening Ambient
Plus Project, Lmax
(dB)2
Increase in
Evening Ambient,
Lmax (dB)3
1 45 69.0 <0.1
2 45 69.0 <0.1
3 41 69.0 <0.1
4 43 58.1 0.1
5 39 58.1 0.1
6 39 58.1 0.1
7 38 58.0 <0.1
8 44 58.2 0.2
9 44 58.2 0.2
10 44 69.0 <0.1
1 Predicted mitigated noise levels from Table 21.
2 Sum of predicted and measured ambient noise levels.
3 Calculated increase in ambient noise levels.
Source: Bollard Acoustical Consultants, Inc. 2022.
Bollard Acoustical Consultants, Inc. (BAC)
Environmental Noise & Vibration Assessment
The Barn at Pheasant Ranch – Butte County, California
Page 30
MM-4B: In addition to implementation of the mitigation discussed in MM-4A, the following
mitigation measures should also be implemented:
1. Speakers located within the barn building should be located and oriented as
configured in the BAC simulation conducted on June 9th, 2022, as proposed.
2. Overall average sound levels from amplified music/speech within the outdoor
ceremony area (lawn) should not exceed 65 dBA at a point 50 feet in front of
the speakers.
3. All amplified event music/speech on the property must occur between the
hours of 7:00 a.m. and 10:00 p.m., as proposed.
4. A maximum of 1 subwoofer should be used during amplified music events.
5. Event staff should periodically monitor sound levels at the 50-foot reference
distance during events to ensure compliance with the recommended average
noise level requirements for sound systems is being maintained.
Significance of Impact 4 after Mitigation: Less than Significant
Impact 5: Event Crowd Noise at Existing Off-Site Residences
According to the project description, the maximum capacity for project events would be limited to
225 people per event. The following analysis evaluates the noise generation potential of a worst-
case large crowd of 225 people within the barn building as well as for outside within the ceremony
area adjacent to the barn. The locations of the barn building, and outdoor ceremony area are
shown on Figure 3.
To quantify event-generated crowd noise at nearby residential receivers, BAC utilized reference
file data for persons speaking in casual, normal and raised voices (casual = 52 dB per person at
3 feet; normal voice = 57 dB per person at 3 feet; raised voice = 64 dB per person at 3 feet) and
persons clapping (light clap = 55 dB per person at 10 feet; normal clap = 65 dB per person at 10
feet; enthusiastic clap = 75 dB per person at 10 feet). Using the provided reference file data,
conservatively assuming 50% of a 225 person crowd is conversing simultaneously (113 people
speaking, 112 people listening), that clapping would occur 2% of the hour, and assuming standard
spherical spreading loss (-6 dB per doubling of distance), data were projected from the effective
noise center of the identified crowd areas to the nearest existing off-site residences (receivers 1
through 10). The results of those projections relative to the applicable Butte County exterior
daytime and evening noise level standards are presented in Table 26.
Bollard Acoustical Consultants, Inc. (BAC)
Environmental Noise & Vibration Assessment
The Barn at Pheasant Ranch – Butte County, California
Page 31
Table 26
Predicted Worst-Case Event Crowd Noise Levels at Existing Off-Site Residences
Receiver1
Distance from Event Crowd
Areas (ft)2
Predicted Noise Levels (dB)3
Barn Building Outdoor Area
Leq Lmax Leq Lmax
1 1,100 26 47 31 52
2 1,050 27 47 32 52
3 1,750 22 43 22 43
4 900 26 47 23 44
5 1,800 22 43 27 48
6 1,800 22 43 27 48
7 2,050 21 42 26 47
8 1,000 27 48 32 53
9 1,000 27 48 32 53
10 1,150 26 47 31 52
County Daytime Exterior Noise Standards (dB) 50 60 50 60
County Evening Exterior Noise Standards (dB) 45 55 45 55
1 Receiver locations are shown on Figure 1.
2 Distances scaled from center of event crowd areas to a point 100’ feet from residences.
3 Predicted crowd noise levels from within barn building include a -5 dB offset to account for building facade
attenuation. Predicted noise levels from outdoor area include offsets ranging from -5 to 10 dB to account for
existing intervening building screening, where applicable.
Source: Bollard Acoustical Consultants, Inc. 2022.
As indicated in Table 26, worst-case event crowd noise exposure is predicted to comply with the
applicable Butte County daytime and evening hourly average (Leq) and maximum (Lmax) exterior
noise level standards at the nearest residential receivers. Table 1 of this report summarizes the
results from the BAC long-term ambient noise survey. Using the lowest measured hourly daytime
and evening noise levels presented in Table 1, ambient plus project event crowd noise level
increases were calculated at the nearest residential receivers and the results of those calculations
are presented in Tables 27 through 30.
Bollard Acoustical Consultants, Inc. (BAC)
Environmental Noise & Vibration Assessment
The Barn at Pheasant Ranch – Butte County, California
Page 32
Table 27
Ambient Plus Project Event Crowd Noise Level Increases at Receivers – Daytime Leq
Receiver
Predicted Noise
Level, Leq (dB)1
Daytime Ambient Plus
Project, Leq (dB)2
Increase in Daytime
Ambient, Leq (dB)3
1 31 55.0 <0.1
2 32 55.0 <0.1
3 22 55.0 <0.1
4 26 44.0 <0.1
5 27 40.2 0.2
6 27 40.2 0.2
7 26 40.2 0.2
8 32 44.3 0.3
9 32 44.3 0.3
10 31 55.0 <0.1
1 Predicted highest crowd noise levels from either barn building or outdoor area presented in Table 26.
2 Sum of predicted and measured ambient noise levels.
3 Calculated increase in ambient noise levels.
Source: Bollard Acoustical Consultants, Inc. 2022.
Table 28
Ambient Plus Project Event Crowd Noise Level Increases at Receivers – Evening Leq
Receiver
Predicted Noise
Level, Leq (dB)1
Evening Ambient Plus
Project, Leq (dB)2
Increase in Evening
Ambient, Leq (dB)3
1 31 52.0 <0.1
2 32 52.0 <0.1
3 22 52.0 <0.1
4 26 47.0 <0.1
5 27 40.2 0.2
6 27 40.2 0.2
7 26 40.2 0.2
8 32 47.1 0.1
9 32 47.1 0.1
10 31 52.0 <0.1
1 Predicted highest crowd noise levels from either barn building or outdoor area presented in Table 26.
2 Sum of predicted and measured ambient noise levels.
3 Calculated increase in ambient noise levels.
Source: Bollard Acoustical Consultants, Inc. 2022.
Bollard Acoustical Consultants, Inc. (BAC)
Environmental Noise & Vibration Assessment
The Barn at Pheasant Ranch – Butte County, California
Page 33
Table 29
Ambient Plus Project Event Crowd Noise Level Increases at Receivers – Daytime Lmax
Receiver
Predicted Noise
Level, Lmax (dB)1
Daytime Ambient Plus
Project, Lmax (dB)2
Increase in Daytime
Ambient, Lmax (dB)3
1 52 72.0 <0.1
2 52 72.0 <0.1
3 43 72.0 <0.1
4 47 62.1 0.1
5 48 60.2 0.2
6 48 60.2 0.2
7 47 60.2 0.2
8 53 62.5 0.5
9 53 62.5 0.5
10 52 72.0 <0.1
1 Predicted highest crowd noise levels from either barn building or outdoor area presented in Table 26.
2 Sum of predicted and measured ambient noise levels.
3 Calculated increase in ambient noise levels.
Source: Bollard Acoustical Consultants, Inc. 2022.
Table 30
Ambient Plus Project Event Crowd Noise Level Increases at Receivers – Evening Lmax
Receiver
Predicted Noise
Level, Lmax (dB)1
Evening Ambient Plus
Project, Lmax (dB)2
Increase in Evening
Ambient, Lmax (dB)3
1 52 69.1 0.1
2 52 69.1 0.1
3 43 69.0 <0.1
4 47 58.2 0.2
5 48 58.4 0.4
6 48 58.4 0.4
7 47 58.3 0.3
8 53 59.1 1.1
9 53 59.1 1.1
10 52 69.1 <0.1
1 Predicted highest crowd noise levels from either barn building or outdoor area presented in Table 26.
2 Sum of predicted and measured ambient noise levels.
3 Calculated increase in ambient noise levels.
Source: Bollard Acoustical Consultants, Inc. 2022.
As indicated in Tables 27 through 30, the increases in ambient noise levels from worst-case
project crowd noise are calculated to be well below the applied significance criterion of 5 dB.
Because noise levels from worst-case project event crowds is predicted to satisfy applicable Butte
County daytime and evening exterior noise level standards at the nearest existing residential
uses, and because noise exposure from that source is not calculated to significantly increase
ambient noise levels at those uses, this impact is identified as being less than significant.
Bollard Acoustical Consultants, Inc. (BAC)
Environmental Noise & Vibration Assessment
The Barn at Pheasant Ranch – Butte County, California
Page 34
Impact 6: Cumulative Event Noise Levels at Existing Off-Site Residences
The calculated cumulative (combined and highest) noise level exposure from analyzed on-site
event noise sources at the nearest existing off-site residences (receivers 1 through 10) is
presented in Tables 31 and 32. The results presented in Tables 31 and 32 include implementation
of the noise abatement measures outlined in Mitigation Measure 4.
It should be noted that due to the logarithmic nature of the decibel scale, the sum of two noise
values which differ by 10 dB equates to an overall increase in noise levels of 0.4 dB. When the
noise sources are equivalent, the sum would result in an overall increase in noise levels of 3 dB.
Table 31
Calculated Cumulative Event Operations Noise Levels at Receivers –Hourly Leq
Receiver
Predicted Noise Levels, Leq (dB)
Calculated
Cumulative, Leq (dB)2 Parking Vehicle Circ.
Amplified
Music1 Crowd
1 28 42 40 31 45
2 29 39 40 32 43
3 23 26 36 22 37
4 28 28 38 26 39
5 21 23 34 27 35
6 21 23 34 27 35
7 20 23 33 26 34
8 26 31 39 32 40
9 26 32 39 32 41
10 27 33 39 31 41
County Daytime Exterior Noise Standard, Leq (dB) 50
County Evening Exterior Noise Standard, Leq (dB) 45
1 Predicted amplified music noise levels after implementation of Mitigation Measure 4.
2 Calculated cumulative noise levels based on predicted noise levels presented in Impacts 2-5.
Source: Bollard Acoustical Consultants, Inc. 2022.
Bollard Acoustical Consultants, Inc. (BAC)
Environmental Noise & Vibration Assessment
The Barn at Pheasant Ranch – Butte County, California
Page 35
Table 32
Highest Event Operations Noise Levels at Receivers – Maximum Lmax
Receiver
Predicted Noise Levels, Lmax (dB)
Highest, Lmax (dB)2 Parking Vehicle Circ.
Amplified
Music1 Crowd
1 45 52 45 52 52
2 45 49 45 52 52
3 40 36 41 43 43
4 45 38 43 47 47
5 38 33 39 48 48
6 38 33 39 48 48
7 37 33 38 47 47
8 43 41 44 53 53
9 43 42 44 53 53
10 44 43 44 52 52
County Daytime Exterior Noise Standard, Lmax (dB) 60
County Evening Exterior Noise Standard, Lmax (dB) 55
1 Predicted amplified music noise levels after implementation of Mitigation Measure 4.
2 Highest predicted noise levels based on data presented in Impacts 2-5.
Source: Bollard Acoustical Consultants, Inc. 2022.
As shown in Tables 31 and 32, cumulative (and highest) noise level exposure from on-site event
operations would comply with the applied Butte County daytime and evening hourly average (Leq)
and maximum (Lmax) exterior noise level standards at the nearest residential receivers. Table 1
of this report summarizes the results from the BAC long-term ambient noise survey. Using the
lowest measured hourly daytime and evening noise levels presented in Table 1, ambient plus
combined project noise level increases were calculated at the nearest residential receivers and
the results of those calculations are presented in Tables 33 through 36.
Bollard Acoustical Consultants, Inc. (BAC)
Environmental Noise & Vibration Assessment
The Barn at Pheasant Ranch – Butte County, California
Page 36
Table 33
Ambient Plus Combined Project Operations Noise Increases at Receivers – Daytime Leq
Receiver
Calculated Combined
Noise Level, Leq (dB)1
Daytime Ambient Plus
Project, Leq (dB)2
Overall Increase in
Daytime Ambient, Leq (dB)3
1 45 55.4 0.4
2 43 55.3 0.3
3 37 55.1 0.1
4 39 45.2 1.2
5 35 41.3 1.3
6 35 41.3 1.3
7 34 41.0 1.0
8 40 45.6 1.6
9 41 45.6 1.6
10 41 55.2 0.2
1 Calculated combined noise levels from Table 31.
2 Sum of calculated combined and measured ambient noise levels.
3 Calculated combined increase in ambient noise levels.
Source: Bollard Acoustical Consultants, Inc. 2022.
Table 34
Ambient Plus Combined Project Operations Noise Increases at Receivers – Evening Leq
Receiver
Calculated Combined
Noise Level, Leq (dB)1
Evening Ambient Plus
Project, Leq (dB)2
Overall Increase in Evening
Ambient, Leq (dB)3
1 45 52.7 0.7
2 43 52.5 0.5
3 37 52.1 0.1
4 39 47.6 0.6
5 35 41.3 1.3
6 35 41.3 1.3
7 34 41.0 1.0
8 40 47.9 0.9
9 41 47.9 0.9
10 41 52.3 0.3
1 Calculated combined noise levels from Table 31.
2 Sum of calculated combined and measured ambient noise levels.
3 Calculated combined increase in ambient noise levels.
Source: Bollard Acoustical Consultants, Inc. 2022.
Bollard Acoustical Consultants, Inc. (BAC)
Environmental Noise & Vibration Assessment
The Barn at Pheasant Ranch – Butte County, California
Page 37
Table 35
Ambient Plus Combined Project Operations Noise Increases at Receivers – Daytime Lmax
Receiver
Highest Operations Noise
Level, Lmax (dB)1
Daytime Ambient Plus
Project, Lmax (dB)2
Overall Increase in Daytime
Ambient, Lmax (dB)3
1 52 72.0 <0.1
2 52 72.0 <0.1
3 43 72.0 <0.1
4 47 62.1 0.1
5 48 60.2 0.2
6 48 60.2 0.2
7 47 60.2 0.2
8 53 62.5 0.5
9 53 62.5 0.5
10 52 72.0 <0.1
1 Highest predicted maximum noise levels from Table 32.
2 Sum of highest predicted maximum noise levels and measured ambient noise levels.
3 Calculated combined increase in ambient noise levels.
Source: Bollard Acoustical Consultants, Inc. 2022.
Table 36
Ambient Plus Project Operations Noise Increases at Receivers – Evening Lmax
Receiver
Highest Operations Noise
Level, Lmax (dB)1
Evening Ambient Plus
Project, Lmax (dB)2
Overall Increase in Evening
Ambient, Lmax (dB)3
1 52 69.1 0.1
2 52 69.1 0.1
3 43 69.0 <0.1
4 47 58.3 0.3
5 48 58.4 0.4
6 48 58.4 0.4
7 47 58.3 0.3
8 53 59.1 1.1
9 53 59.1 1.1
10 52 69.1 0.1
1 Highest predicted maximum noise levels from Table 32.
2 Sum of highest predicted maximum noise levels and measured ambient noise levels.
3 Calculated combined increase in ambient noise levels.
Source: Bollard Acoustical Consultants, Inc. 2022.
Bollard Acoustical Consultants, Inc. (BAC)
Environmental Noise & Vibration Assessment
The Barn at Pheasant Ranch – Butte County, California
Page 38
The data provided in Tables 33 through 36 indicate that the increases in ambient noise levels
from combined (or highest) project on-site operations are calculated to be well below the applied
significance criterion of 5 dB. Because the calculated cumulative (combined or highest) noise
exposure from project on-site operations is predicted to satisfy applicable Butte County daytime
and evening exterior noise level standards at the nearest existing residential uses, and because
cumulative noise exposure is not calculated to significantly increase ambient noise levels at those
uses, this impact is identified as being less than significant.
Vibration Impacts Associated with On-Site Project Activities
Impact 7: Vibration Generated by Proposed On-Site Activities
Results from the ambient vibration level monitoring within the project area (Table 2) indicate that
measured maximum vibration levels were below the strictest Caltrans thresholds for damage to
structures presented in Table 3. In addition, measured maximum vibration levels within the
project area ranged from imperceptible to barely/slightly perceptible human response as defined
by Caltrans in Table 4 (annoyance potential criteria). Therefore, it is expected that the project
would not result in the exposure of persons to excessive groundborne vibration levels at proposed
uses of the project.
The project consists of the operation an event facility. It is the experience of BAC these uses do
not typically have equipment that generates appreciable vibration. Further, it is our understanding
that the project does not propose equipment that will produce appreciable vibration.
Because vibration levels due to and upon the proposed project are expected to satisfy the
applicable Caltrans groundborne impact vibration criteria at the nearest existing residential uses,
this impact is identified as being less than significant.
This concludes BAC’s noise and vibration assessment of The Barn at Pheasant Trail Ranch
project in Butte County, California. Please contact BAC at (530) 537-2328 or
dariog@bacnoise.com if you have any comments or questions regarding this report.
Appendix A
Acoustical Terminology
Acoustics The science of sound.
Ambient Noise The distinctive acoustical characteristics of a given space consisting of all noise sources
audible at that location. In many cases, the term ambient is used to describe an existing
or pre-project condition such as the setting in an environmental noise study.
Attenuation The reduction of an acoustic signal.
A-Weighting A frequency-response adjustment of a sound level meter that conditions the output
signal to approximate human response.
Decibel or dB Fundamental unit of sound. A Bell is defined as the logarithm of the ratio of the sound
pressure squared over the reference pressure squared. A Decibel is one-tenth of a
Bell.
CNEL Community Noise Equivalent Level. Defined as the 24-hour average noise level with
noise occurring during evening hours (7 - 10 p.m.) weighted by a factor of three and
nighttime hours weighted by a factor of 10 prior to averaging.
Frequency The measure of the rapidity of alterations of a periodic signal, expressed in cycles per
second or hertz.
IIC Impact Insulation Class (IIC): A single-number representation of a floor/ceiling partition’s
impact generated noise insulation performance. The field-measured version of this
number is the FIIC.
Ldn Day/Night Average Sound Level. Similar to CNEL but with no evening weighting.
Leq Equivalent or energy-averaged sound level.
Lmax The highest root-mean-square (RMS) sound level measured over a given period of time.
Loudness A subjective term for the sensation of the magnitude of sound.
Masking The amount (or the process) by which the threshold of audibility is for one sound is
raised by the presence of another (masking) sound.
Noise Unwanted sound.
Peak Noise The level corresponding to the highest (not RMS) sound pressure measured over a
given period of time. This term is often confused with the “Maximum” level, which is the
highest RMS level.
RT60 The time it takes reverberant sound to decay by 60 dB once the source has been
removed.
STC Sound Transmission Class (STC): A single-number representation of a partition’s noise
insulation performance. This number is based on laboratory-measured, 16-band (1/3-
octave) transmission loss (TL) data of the subject partition. The field-measured version
of this number is the FSTC.
Legend
Appendix B-1
Long-term noise and vibration measurement site 1A
B
C
Long-term noise and vibration measurement site 2
Long-term noise and vibration measurement site 3
The Barn at Pheasant Ranch
Butte County, California
Ambient Noise & Vibration Survey Photographs
A B C
Legend
Event amplified music simulation measurement site AA
B
C
Event amplified music simulation measurement site B
Event amplified music simulation measurement site C
A B C
The Barn at Pheasant Ranch
Butte County, California
Event Music Simulation Photographs
Appendix B-2
Legend
Event amplified music simulation measurement site DA
B
C
Event amplified music simulation measurement site E
Event amplified music simulation measurement site F
A B C
The Barn at Pheasant Ranch
Butte County, California
Event Music Simulation Photographs
Appendix B-3
Legend The Barn at Pheasant Ranch
Butte County, California
Event Music Simulation Photographs
Appendix B-4
Photos: BAC sound system setup within barn –proposed location of sound system setups during events
Hour Leq Lmax L50 L90
12:00 AM 49 71 46 431:00 AM 52 67 50 45 High Low Average High Low Average High Low Average
2:00 AM 51 71 47 44 Leq (Average)59 56 57 57 54 55 61 49 56
3:00 AM 51 66 49 43 Lmax (Maximum)76 71 73 83 70 78 91 66 73
4:00 AM 54 69 50 46 L50 (Median)52 49 50 47 44 45 52 46 495:00 AM 57 71 52 48 L90 (Background)47 36 45 44 38 40 48 43 45
6:00 AM 59 73 52 487:00 AM 59 76 50 43
8:00 AM 57 71 49 44 Computed CNEL (dBA)63
9:00 AM 57 71 50 47 % Daytime Energy 59%
10:00 AM 57 72 50 47 % Evening Energy 10%
11:00 AM 57 75 49 47 % Nighttime Energy 31%
12:00 PM 56 71 49 46
1:00 PM 57 74 50 472:00 PM 57 74 51 47
3:00 PM 58 72 52 47
4:00 PM 58 71 50 43
5:00 PM 58 74 52 466:00 PM 57 75 49 36
7:00 PM 56 80 44 38
8:00 PM 57 83 44 39
9:00 PM 54 70 47 44
10:00 PM 61 91 49 4511:00 PM 53 75 49 44
GPS Coordinates
Appendix C-1
Long-Term Ambient Noise Monitoring Results - Site 1
The Barn at Pheasant Ranch - Butte County, California
Friday, June 10, 2022
39°46'29.75" N
121°54'27.74" W
Daytime (7 am - 7 pm)Nighttime (10 pm - 7 am)
Statistical Summary (dBA)
Evening (7 pm - 10 pm)
Hour Leq Lmax L50 L90
12:00 AM 49 71 45 431:00 AM 50 66 48 46 High Low Average High Low Average High Low Average
2:00 AM 50 71 48 45 Leq (Average)56 54 55 56 54 55 53 48 51
3:00 AM 49 70 46 36 Lmax (Maximum)76 70 72 82 71 76 78 66 70
4:00 AM 48 69 44 40 L50 (Median)46 38 42 47 40 43 48 36 445:00 AM 52 71 46 42 L90 (Background)38 31 34 36 33 34 46 32 40
6:00 AM 53 70 47 417:00 AM 55 76 41 38
8:00 AM 55 70 40 35 Computed CNEL (dBA)59
9:00 AM 55 74 39 33 % Daytime Energy 65%
10:00 AM 56 74 41 33 % Evening Energy 16%
11:00 AM 55 71 40 33 % Nighttime Energy 18%
12:00 PM 55 75 38 31
1:00 PM 55 73 40 322:00 PM 56 71 45 35
3:00 PM 56 73 44 35
4:00 PM 55 70 44 37
5:00 PM 55 71 46 376:00 PM 54 71 43 35
7:00 PM 55 75 44 36
8:00 PM 56 82 47 33
9:00 PM 54 71 40 33
10:00 PM 52 68 38 3311:00 PM 52 78 36 32
Appendix C-2
Long-Term Ambient Noise Monitoring Results - Site 1
The Barn at Pheasant Ranch - Butte County, California
Saturday, June 11, 2022
GPS Coordinates 39°46'29.75" N
121°54'27.74" W
Statistical Summary (dBA)
Daytime (7 am - 7 pm)Evening (7 pm - 10 pm)Nighttime (10 pm - 7 am)
Hour Leq Lmax L50 L90
12:00 AM 46 69 32 301:00 AM 48 69 33 30 High Low Average High Low Average High Low Average
2:00 AM 50 80 36 32 Leq (Average)56 51 55 55 53 54 52 44 49
3:00 AM 46 70 35 30 Lmax (Maximum)83 67 72 72 69 71 80 65 71
4:00 AM 44 65 33 30 L50 (Median)49 42 45 50 48 49 45 32 375:00 AM 47 67 37 33 L90 (Background)42 34 39 44 39 42 38 30 33
6:00 AM 51 68 41 367:00 AM 51 67 43 38
8:00 AM 53 69 43 37 Computed CNEL (dBA)57
9:00 AM 56 81 46 40 % Daytime Energy 69%
10:00 AM 54 72 45 40 % Evening Energy 17%
11:00 AM 55 70 49 42 % Nighttime Energy 15%
12:00 PM 56 72 48 42
1:00 PM 55 71 47 412:00 PM 56 83 42 34
3:00 PM 54 68 43 34
4:00 PM 54 70 46 39
5:00 PM 54 72 45 396:00 PM 55 70 48 42
7:00 PM 55 72 48 39
8:00 PM 55 72 50 44
9:00 PM 53 69 48 43
10:00 PM 52 78 45 3811:00 PM 50 73 44 38
Appendix C-3
Long-Term Ambient Noise Monitoring Results - Site 1
The Barn at Pheasant Ranch - Butte County, California
Sunday, June 12, 2022
GPS Coordinates 39°46'29.75" N
121°54'27.74" W
Statistical Summary (dBA)
Daytime (7 am - 7 pm)Evening (7 pm - 10 pm)Nighttime (10 pm - 7 am)
Hour Leq Lmax L50 L90
12:00 AM 49 68 43 361:00 AM 47 73 37 32 High Low Average High Low Average High Low Average
2:00 AM 45 64 41 37 Leq (Average)59 55 58 54 51 52 57 45 52
3:00 AM 48 69 43 38 Lmax (Maximum)77 69 74 73 67 69 73 64 69
4:00 AM 53 70 48 41 L50 (Median)54 47 52 44 36 40 48 32 415:00 AM 55 72 47 40 L90 (Background)48 40 46 37 31 34 41 29 36
6:00 AM 57 72 48 407:00 AM 58 72 54 46
8:00 AM 59 75 54 46 Computed CNEL (dBA)60
9:00 AM 58 73 54 48 % Daytime Energy 78%
10:00 AM 58 76 54 48 % Evening Energy 6%
11:00 AM 58 75 54 48 % Nighttime Energy 16%
12:00 PM 57 77 52 46
1:00 PM 57 73 52 452:00 PM 57 71 52 45
3:00 PM 57 69 53 45
4:00 PM 57 74 52 45
5:00 PM 58 77 52 446:00 PM 55 72 47 40
7:00 PM 54 73 44 37
8:00 PM 52 68 40 35
9:00 PM 51 67 36 31
10:00 PM 50 69 33 3011:00 PM 46 65 32 29
Appendix C-4
Long-Term Ambient Noise Monitoring Results - Site 1
The Barn at Pheasant Ranch - Butte County, California
Monday, June 13, 2022
GPS Coordinates 39°46'29.75" N
121°54'27.74" W
Statistical Summary (dBA)
Daytime (7 am - 7 pm)Evening (7 pm - 10 pm)Nighttime (10 pm - 7 am)
Hour Leq Lmax L50 L90
12:00 AM 54 58 54 521:00 AM 51 57 51 48 High Low Average High Low Average High Low Average
2:00 AM 53 61 52 51 Leq (Average)52 46 48 51 47 49 54 47 52
3:00 AM 53 55 53 52 Lmax (Maximum)68 59 63 64 56 61 68 55 59
4:00 AM 52 56 52 50 L50 (Median)48 42 46 51 42 45 54 46 515:00 AM 50 62 50 43 L90 (Background)46 35 43 47 35 40 52 43 48
6:00 AM 47 56 46 437:00 AM 48 64 46 43
8:00 AM 50 65 47 43 Computed CNEL (dBA)58
9:00 AM 52 66 48 46 % Daytime Energy 35%
10:00 AM 48 61 48 46 % Evening Energy 10%
11:00 AM 48 62 47 46 % Nighttime Energy 55%
12:00 PM 49 63 47 46
1:00 PM 49 68 47 452:00 PM 47 61 46 45
3:00 PM 47 59 46 45
4:00 PM 46 61 44 37
5:00 PM 47 61 44 386:00 PM 46 65 42 35
7:00 PM 49 63 42 35
8:00 PM 47 64 42 38
9:00 PM 51 56 51 47
10:00 PM 51 68 50 4811:00 PM 52 58 52 46
Appendix C-5
Long-Term Ambient Noise Monitoring Results - Site 2
The Barn at Pheasant Ranch - Butte County, California
Friday, June 10, 2022
GPS Coordinates 39°46'23.21" N
121°54'34.49" W
Statistical Summary (dBA)
Daytime (7 am - 7 pm)Evening (7 pm - 10 pm)Nighttime (10 pm - 7 am)
Hour Leq Lmax L50 L90
12:00 AM 51 55 51 481:00 AM 52 55 52 51 High Low Average High Low Average High Low Average
2:00 AM 52 57 52 50 Leq (Average)50 41 44 54 41 49 52 43 51
3:00 AM 51 57 51 49 Lmax (Maximum)75 51 62 71 58 63 70 55 59
4:00 AM 52 55 52 49 L50 (Median)44 36 39 52 38 43 52 41 505:00 AM 50 64 49 38 L90 (Background)40 32 35 50 35 41 51 37 46
6:00 AM 43 56 41 377:00 AM 50 75 43 40
8:00 AM 47 66 44 39 Computed CNEL (dBA)57
9:00 AM 44 64 39 34 % Daytime Energy 19%
10:00 AM 42 56 39 33 % Evening Energy 15%
11:00 AM 41 61 37 33 % Nighttime Energy 66%
12:00 PM 41 51 39 34
1:00 PM 42 58 36 322:00 PM 42 64 38 34
3:00 PM 42 57 40 35
4:00 PM 44 70 40 36
5:00 PM 42 63 38 356:00 PM 42 55 39 35
7:00 PM 41 60 38 35
8:00 PM 41 58 38 36
9:00 PM 54 71 52 50
10:00 PM 51 65 51 4911:00 PM 51 70 49 47
Appendix C-6
Long-Term Ambient Noise Monitoring Results - Site 2
The Barn at Pheasant Ranch - Butte County, California
Saturday, June 11, 2022
GPS Coordinates 39°46'23.21" N
121°54'34.49" W
Statistical Summary (dBA)
Daytime (7 am - 7 pm)Evening (7 pm - 10 pm)Nighttime (10 pm - 7 am)
Hour Leq Lmax L50 L90
12:00 AM 50 56 49 471:00 AM 53 71 52 49 High Low Average High Low Average High Low Average
2:00 AM 53 64 53 50 Leq (Average)51 46 48 49 45 48 53 42 50
3:00 AM 51 62 51 47 Lmax (Maximum)70 60 63 63 59 61 71 53 61
4:00 AM 51 65 50 48 L50 (Median)47 43 45 49 43 46 53 40 495:00 AM 48 53 47 39 L90 (Background)43 38 40 47 38 42 50 37 45
6:00 AM 42 56 40 377:00 AM 46 60 43 40
8:00 AM 47 61 44 40 Computed CNEL (dBA)57
9:00 AM 48 65 45 41 % Daytime Energy 41%
10:00 AM 48 65 45 40 % Evening Energy 10%
11:00 AM 51 67 47 42 % Nighttime Energy 49%
12:00 PM 50 63 47 43
1:00 PM 49 62 46 412:00 PM 47 64 44 38
3:00 PM 47 62 44 39
4:00 PM 50 70 47 42
5:00 PM 47 63 44 406:00 PM 46 62 44 40
7:00 PM 45 61 43 38
8:00 PM 48 63 46 42
9:00 PM 49 59 49 47
10:00 PM 49 62 49 4511:00 PM 50 58 49 47
Appendix C-7
Long-Term Ambient Noise Monitoring Results - Site 2
The Barn at Pheasant Ranch - Butte County, California
Sunday, June 12, 2022
GPS Coordinates 39°46'23.21" N
121°54'34.49" W
Statistical Summary (dBA)
Daytime (7 am - 7 pm)Evening (7 pm - 10 pm)Nighttime (10 pm - 7 am)
Hour Leq Lmax L50 L90
12:00 AM 49 54 49 461:00 AM 49 57 49 47 High Low Average High Low Average High Low Average
2:00 AM 49 56 48 45 Leq (Average)54 47 51 51 43 47 52 47 49
3:00 AM 49 57 48 44 Lmax (Maximum)70 63 67 59 56 58 58 54 57
4:00 AM 48 57 47 43 L50 (Median)51 44 49 51 40 44 52 45 485:00 AM 48 57 45 40 L90 (Background)46 39 44 48 37 40 49 40 44
6:00 AM 47 58 45 407:00 AM 50 63 47 43
8:00 AM 52 66 50 45 Computed CNEL (dBA)56
9:00 AM 52 69 50 44 % Daytime Energy 66%
10:00 AM 53 70 51 46 % Evening Energy 7%
11:00 AM 54 67 50 46 % Nighttime Energy 28%
12:00 PM 53 67 50 46
1:00 PM 52 69 50 452:00 PM 50 67 48 43
3:00 PM 51 67 48 43
4:00 PM 51 67 49 44
5:00 PM 50 65 48 436:00 PM 47 63 44 39
7:00 PM 44 58 41 37
8:00 PM 43 59 40 37
9:00 PM 51 56 51 48
10:00 PM 52 57 52 4911:00 PM 48 56 46 43
Appendix C-8
Long-Term Ambient Noise Monitoring Results - Site 2
The Barn at Pheasant Ranch - Butte County, California
Monday, June 13, 2022
GPS Coordinates 39°46'23.21" N
121°54'34.49" W
Statistical Summary (dBA)
Daytime (7 am - 7 pm)Evening (7 pm - 10 pm)Nighttime (10 pm - 7 am)
Hour Leq Lmax L50 L90
12:00 AM 43 46 43 411:00 AM 40 47 40 39 High Low Average High Low Average High Low Average
2:00 AM 45 67 45 40 Leq (Average)44 36 42 47 40 44 46 38 43
3:00 AM 40 59 39 37 Lmax (Maximum)73 54 64 65 62 64 67 46 55
4:00 AM 38 48 37 34 L50 (Median)42 30 34 48 32 38 45 37 415:00 AM 43 65 40 36 L90 (Background)38 27 30 40 28 32 44 34 39
6:00 AM 41 51 41 377:00 AM 44 66 42 38
8:00 AM 40 62 37 34 Computed CNEL (dBA)50
9:00 AM 38 57 36 33 % Daytime Energy 40%
10:00 AM 40 60 35 32 % Evening Energy 18%
11:00 AM 43 70 34 31 % Nighttime Energy 43%
12:00 PM 36 54 34 31
1:00 PM 42 62 34 292:00 PM 43 73 30 27
3:00 PM 41 70 30 27
4:00 PM 44 70 31 27
5:00 PM 42 66 33 296:00 PM 38 60 32 27
7:00 PM 40 65 32 28
8:00 PM 41 62 35 28
9:00 PM 47 64 48 40
10:00 PM 45 54 45 4011:00 PM 46 58 45 44
Appendix C-9
Long-Term Ambient Noise Monitoring Results - Site 3
The Barn at Pheasant Ranch - Butte County, California
Friday, June 10, 2022
GPS Coordinates 39°46'05.64" N
121°54'29.76" W
Statistical Summary (dBA)
Daytime (7 am - 7 pm)Evening (7 pm - 10 pm)Nighttime (10 pm - 7 am)
Hour Leq Lmax L50 L90
12:00 AM 47 49 47 441:00 AM 44 48 43 42 High Low Average High Low Average High Low Average
2:00 AM 45 56 45 42 Leq (Average)44 36 40 47 37 43 50 38 45
3:00 AM 44 47 43 40 Lmax (Maximum)70 55 60 66 52 58 73 47 54
4:00 AM 41 48 41 36 L50 (Median)39 31 35 46 33 38 48 37 435:00 AM 42 65 40 36 L90 (Background)37 28 31 39 31 34 46 35 40
6:00 AM 38 50 37 357:00 AM 44 65 39 37
8:00 AM 38 55 36 33 Computed CNEL (dBA)52
9:00 AM 39 70 31 28 % Daytime Energy 25%
10:00 AM 37 58 33 30 % Evening Energy 13%
11:00 AM 41 65 33 29 % Nighttime Energy 62%
12:00 PM 36 55 33 29
1:00 PM 39 59 31 282:00 PM 42 66 36 31
3:00 PM 39 55 36 32
4:00 PM 42 60 37 32
5:00 PM 41 61 37 336:00 PM 39 56 36 33
7:00 PM 37 52 36 32
8:00 PM 37 57 33 31
9:00 PM 47 66 46 39
10:00 PM 48 50 48 4611:00 PM 50 73 43 39
Appendix C-10
Long-Term Ambient Noise Monitoring Results - Site 3
The Barn at Pheasant Ranch - Butte County, California
Saturday, June 11, 2022
GPS Coordinates 39°46'05.64" N
121°54'29.76" W
Statistical Summary (dBA)
Daytime (7 am - 7 pm)Evening (7 pm - 10 pm)Nighttime (10 pm - 7 am)
Hour Leq Lmax L50 L90
12:00 AM 41 46 41 401:00 AM 47 69 42 38 High Low Average High Low Average High Low Average
2:00 AM 46 62 42 37 Leq (Average)53 44 50 46 44 45 50 41 46
3:00 AM 45 58 41 36 Lmax (Maximum)68 62 65 63 61 61 69 46 60
4:00 AM 44 59 41 38 L50 (Median)50 39 46 43 41 42 49 40 425:00 AM 48 61 46 39 L90 (Background)44 37 41 40 37 39 40 36 38
6:00 AM 50 63 49 407:00 AM 52 64 50 43
8:00 AM 51 66 49 42 Computed CNEL (dBA)53
9:00 AM 51 63 49 42 % Daytime Energy 70%
10:00 AM 50 62 48 41 % Evening Energy 7%
11:00 AM 53 68 50 44 % Nighttime Energy 23%
12:00 PM 52 67 50 44
1:00 PM 51 65 48 402:00 PM 44 63 40 37
3:00 PM 44 67 39 37
4:00 PM 45 63 42 39
5:00 PM 46 67 42 396:00 PM 45 64 42 39
7:00 PM 44 61 41 37
8:00 PM 46 63 43 39
9:00 PM 45 61 42 40
10:00 PM 42 58 40 3811:00 PM 44 61 41 38
Appendix C-11
Long-Term Ambient Noise Monitoring Results - Site 3
The Barn at Pheasant Ranch - Butte County, California
Sunday, June 12, 2022
GPS Coordinates 39°46'05.64" N
121°54'29.76" W
Statistical Summary (dBA)
Daytime (7 am - 7 pm)Evening (7 pm - 10 pm)Nighttime (10 pm - 7 am)
Hour Leq Lmax L50 L90
12:00 AM 43 58 39 361:00 AM 39 55 36 34 High Low Average High Low Average High Low Average
2:00 AM 42 60 39 37 Leq (Average)52 42 50 41 40 40 45 35 42
3:00 AM 43 60 40 37 Lmax (Maximum)80 56 65 65 57 61 63 46 58
4:00 AM 45 63 41 38 L50 (Median)49 40 46 39 35 37 42 35 395:00 AM 44 61 42 39 L90 (Background)44 35 42 37 31 34 39 32 36
6:00 AM 44 60 42 397:00 AM 49 65 45 41
8:00 AM 51 68 48 44 Computed CNEL (dBA)51
9:00 AM 52 80 49 44 % Daytime Energy 85%
10:00 AM 52 66 49 44 % Evening Energy 2%
11:00 AM 51 66 49 44 % Nighttime Energy 12%
12:00 PM 50 66 47 43
1:00 PM 50 64 48 432:00 PM 48 62 45 40
3:00 PM 48 66 45 41
4:00 PM 48 61 46 42
5:00 PM 48 66 45 406:00 PM 42 56 40 35
7:00 PM 40 57 37 34
8:00 PM 41 65 35 31
9:00 PM 40 61 39 37
10:00 PM 39 58 37 3611:00 PM 35 46 35 32
Appendix C-12
Long-Term Ambient Noise Monitoring Results - Site 3
The Barn at Pheasant Ranch - Butte County, California
Monday, June 13, 2022
GPS Coordinates 39°46'05.64" N
121°54'29.76" W
Statistical Summary (dBA)
Daytime (7 am - 7 pm)Evening (7 pm - 10 pm)Nighttime (10 pm - 7 am)
CNEL:63 dB
Long-Term Ambient Noise Monitoring Results - Site 1
The Barn at Pheasant Ranch - Butte County, California
Friday, June 10, 2022
Appendix D-1
30
40
50
60
70
80
90
100
12:00 AM 4:00 AM 8:00 AM 12:00 PM 4:00 PM 8:00 PM 11:00 PMSound Level (dBA)Hour of Day
Average (Leq) Maximum (Lmax) Median (L50) Background (L90)
CNEL:59 dB
Appendix D-2
Long-Term Ambient Noise Monitoring Results - Site 1
The Barn at Pheasant Ranch - Butte County, California
Saturday, June 11, 2022
30
40
50
60
70
80
90
12:00 AM 4:00 AM 8:00 AM 12:00 PM 4:00 PM 8:00 PM 11:00 PMSound Level (dBA)Hour of Day
Average (Leq) Maximum (Lmax) Median (L50) Background (L90)
CNEL:57 dB
Appendix D-3
Long-Term Ambient Noise Monitoring Results - Site 1
The Barn at Pheasant Ranch - Butte County, California
Sunday, June 12, 2022
30
40
50
60
70
80
90
12:00 AM 4:00 AM 8:00 AM 12:00 PM 4:00 PM 8:00 PM 11:00 PMSound Level (dBA)Hour of Day
Average (Leq) Maximum (Lmax) Median (L50) Background (L90)
CNEL:60 dB
Appendix D-4
Long-Term Ambient Noise Monitoring Results - Site 1
The Barn at Pheasant Ranch - Butte County, California
Monday, June 13, 2022
30
35
40
45
50
55
60
65
70
75
80
12:00 AM 4:00 AM 8:00 AM 12:00 PM 4:00 PM 8:00 PM 11:00 PMSound Level (dBA)Hour of Day
Average (Leq) Maximum (Lmax) Median (L50) Background (L90)
CNEL:58 dB
Appendix D-5
Long-Term Ambient Noise Monitoring Results - Site 2
The Barn at Pheasant Ranch - Butte County, California
Friday, June 10, 2022
30
35
40
45
50
55
60
65
70
75
12:00 AM 4:00 AM 8:00 AM 12:00 PM 4:00 PM 8:00 PM 11:00 PMSound Level (dBA)Hour of Day
Average (Leq) Maximum (Lmax) Median (L50) Background (L90)
CNEL:57 dB
Appendix D-6
Long-Term Ambient Noise Monitoring Results - Site 2
The Barn at Pheasant Ranch - Butte County, California
Saturday, June 11, 2022
30
35
40
45
50
55
60
65
70
75
80
12:00 AM 4:00 AM 8:00 AM 12:00 PM 4:00 PM 8:00 PM 11:00 PMSound Level (dBA)Hour of Day
Average (Leq) Maximum (Lmax) Median (L50) Background (L90)
CNEL:57 dB
Appendix D-7
Long-Term Ambient Noise Monitoring Results - Site 2
The Barn at Pheasant Ranch - Butte County, California
Sunday, June 12, 2022
30
35
40
45
50
55
60
65
70
75
12:00 AM 4:00 AM 8:00 AM 12:00 PM 4:00 PM 8:00 PM 11:00 PMSound Level (dBA)Hour of Day
Average (Leq) Maximum (Lmax) Median (L50) Background (L90)
CNEL:56 dB
Appendix D-8
Long-Term Ambient Noise Monitoring Results - Site 2
The Barn at Pheasant Ranch - Butte County, California
Monday, June 13, 2022
30
35
40
45
50
55
60
65
70
75
12:00 AM 4:00 AM 8:00 AM 12:00 PM 4:00 PM 8:00 PM 11:00 PMSound Level (dBA)Hour of Day
Average (Leq) Maximum (Lmax) Median (L50) Background (L90)
CNEL:50 dB
Appendix D-9
Long-Term Ambient Noise Monitoring Results - Site 3
The Barn at Pheasant Ranch - Butte County, California
Friday, June 10, 2022
20
30
40
50
60
70
80
90
12:00 AM 4:00 AM 8:00 AM 12:00 PM 4:00 PM 8:00 PM 11:00 PMSound Level (dBA)Hour of Day
Average (Leq) Maximum (Lmax) Median (L50) Background (L90)
CNEL:52 dB
Appendix D-10
Long-Term Ambient Noise Monitoring Results - Site 3
The Barn at Pheasant Ranch - Butte County, California
Saturday, June 11, 2022
20
30
40
50
60
70
80
90
12:00 AM 4:00 AM 8:00 AM 12:00 PM 4:00 PM 8:00 PM 11:00 PMSound Level (dBA)Hour of Day
Average (Leq) Maximum (Lmax) Median (L50) Background (L90)
CNEL:53 dB
Appendix D-11
Long-Term Ambient Noise Monitoring Results - Site 3
The Barn at Pheasant Ranch - Butte County, California
Sunday, June 12, 2022
20
30
40
50
60
70
80
90
12:00 AM 4:00 AM 8:00 AM 12:00 PM 4:00 PM 8:00 PM 11:00 PMSound Level (dBA)Hour of Day
Average (Leq) Maximum (Lmax) Median (L50) Background (L90)
CNEL:51 dB
Appendix D-12
Long-Term Ambient Noise Monitoring Results - Site 3
The Barn at Pheasant Ranch - Butte County, California
Monday, June 13, 2022
20
30
40
50
60
70
80
90
12:00 AM 4:00 AM 8:00 AM 12:00 PM 4:00 PM 8:00 PM 11:00 PMSound Level (dBA)Hour of Day
Average (Leq) Maximum (Lmax) Median (L50) Background (L90)