San Marcos City Council
December 12, 2023

Appendix H
Noise Study

UPDATED
Noise Technical Report
for the
Restaurant Row Project
City of San Marcos. California
Prepared for:

Lennar
16465 Via Esprillo, Suite 150
San Diego, California 92127
Contact: David Shepherd
Prepared by:

605 Third Street
Encinitas, California 92024
Contacts: Jonathan Leech, INCE
JULY 2023

Printed on 30% post-consumer recycled material.
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Table of Contents
SECTION PAGE NO.

ACRONYMS AND ABBREVIATIONS ................................ ................................ ................................ ............................. III 1 INTRODUCTION AND BACKGROUND ................................ ................................ ................................ ............. 1 2 REGULATORY SETTING ................................ ................................ ................................ ................................ . 9 3 EXISTING CONDITIONS ................................ ................................ ................................ ................................ 13 4 THRESHOLDS OF SIGNIFICANCE ................................ ................................ ................................ ................ 17 5 IMPACT DISCUSSION ................................ ................................ ................................ ................................ .. 19 6 MITIGATION MEASURES ................................ ................................ ................................ .............................. 35 7 SUMMARY OF FINDINGS ................................ ................................ ................................ ............................. 37 8 REFERENCES CITED ................................ ................................ ................................ ................................ .... 39

APPENDICES
A Baseline Noise Measurement Field Data
B Construction Noise Modeling Input and Output
C Traffic Noise Modeling Data
D Stationary Operational Noise Prediction

FIGURES
1 Project Location ................................................................................................................................................... 5 2 Conceptual Site Plan ............................................................................................................................................ 7 3 Noise Measurement Locations ........................................................................................................................ 15 4 Stationary Source Operational Noise Contours ............................................................................................... 25 TABLES
Table 1 Typical Noise Levels Associated With Common Activities ................................................................................. 2 Table 2. Exterior Noise Standards by Zone ................................................................................................................... 11 Table 3. Permitted Increase in Exterior Noise Levels ................................................................................................... 11 Table 4. Permitted Increase in Interior Noise Levels .................................................................................................... 11 Table 5. Measured Baseline Outdoor Ambient Noise Levels ....................................................................................... 13 Table 6. Typical Construction Equipment Maximum Noise Levels .............................................................................. 19 Table 7. Estimated Distances between Construction Activities and the Nearest Noise- Sensitive Receptors ......... 20 Table 8. Predicted Construction Noise Levels per Activity Phase ................................................................................ 21 Table 9. Project Traffic Generation Versus Current Uses Traffic ................................................................................. 23 Table 10. Roadway Traffic Noise Modeling Results ..................................................................................................... 24 Table 11. Stationary Noise Source Levels Compared to Noise Ordinance ................................................................. 27 Table 12. Stationary Noise Source Modeling Results Compared to Ambient ............................................................. 31

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Acronyms and Abbreviations
Acronym/Abbreviation Definition
a.k.a. Also known as
APN Assessor parcel number
Caltrans California Department of Transportation
CEQA California Environmental Quality Act
City City of San Marco
CNEL Community Noise Equivalent Level
dB decibel
dBA A-weighted decibel
DOT Department of Transportation
Pacific General Plan Amendment/Rezone Project proposed project FHWA Federal Highway Administration
FTA Federal Transit Administration
ips inches per second
Ldn day–night average noise level
Leq equivalent noise level
Lmax maximum sound level
Lmin minimum sound level
OPR Office of Planning and Research
PPV peak particle velocity
RCNM Roadway Construction Noise Model
SLM Sound level meter
SPL Sound pressure level
ST Short-term
STC Sound transmission class
TL Transmission loss

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1 Introduction and Background
This technical noise report evaluates the potential noise impacts during construction and operation of the Restaurant Row Project (project). This assessment utilizes City of San Marcos (City) significance thresholds that are comparable to those relating to noise and vibration assessment in Appendix G of the California Environmental Quality Act Guidelines (14 CCR 15000 et seq.).

Project Description
The Project site is located at 1020 West San Marcos Boulevard on the northeast corner of West San Marcos Boulevard and Via Vera Cruz (APNs 219 -200-30, 31, and 45). The project location and project site boundary are shown in Figure 1 (Project Location).

The proposed Restaurant Row Project (project) consists of demolition of 63,484 square feet (sf) o f existing (primarily vacant) restaurant uses on-site, and re-development of 202 multi-family residential units and 10,400 sf of commercial retail uses on the 10.5 -acre project site (Figure 2, Conceptual Site Plan). Residential units would consist of eight (8) three-bedroom townhomes over commercial (town over commercial); 17 front street townhomes ranging in size from three- to four-bedrooms; 57 court townhomes ranging in size from two- to four-bedrooms; and 120 motor court units ranging in size from two - to three-bedrooms. The project would also incorporate a 1.2 acre neighborhood public park including dedicated dog areas, four tot lots, a rolling plaza (for roller skates/roller blades), skaters bowl, open lawn area and 4 pickleball courts. The park would not include an amphitheater or event space, and no outdoor amplified sound system is proposed. From the perspective of potential noise generation for the neighborhood park component, the pickleball courts represent the only potential noise source of concern.

The project includes a request for a Specific Plan, General Plan Amendment, Rezone, Site Development Plan for the private development, and Vesting Tentative Subdivision Map for a mixed -use residential development project on a 10.5-acre site in the City of San Marcos. Additionally, the project requests a separate Site Development Plan for the development of a proposed 1.1-acre neighborhood public park. The General Plan Amendment and Rezone would change the General Plan designation and Zoning from Mixed -Use 1 (MU -1) and Light Industrial (L -1) to Specific Plan Area (SPA). The Specific Plan has been prepared with the intent to provide a comprehensive plan to ensure the efficient development of a new mixed -use residential community. The Specific Plan serves as both a policy document and a regulatory document for the systematic implementation of the policies and goals of the General Plan. The Site Development Plan would configure the site for multi -family dwelling units, ground floor commercial mixed-use space, recreational open space, and private open space. The Tentative Subdivision Map presents specific infrastructure, and lot and street configurations for the site.

Noise Characteristics
Sound is mechanical energy transmitted by pressure waves in a compressible medium, such as air. Noise is defined as sound that is loud, unpleasant, unexpected, or undesired. The sound pressure level (SPL) has become the most common descriptor used to characterize the loudness of an ambient sound level. The unit of measurement of sound pressure is a decibel (dB). Under controlled conditions in an acoustics laboratory, the trained, healthy human ear is able to discern changes in sound levels of 1 dB when exposed to steady, single -frequency signals in the mid - frequency range. Outsi de such controlled conditions, the trained ear can detect changes of 2 dB in normal environmental noise. It is widely accepted that the average healthy ear, however, can barely perceive environmental noise level changes of 3 dB. A change of 5 dB is readily perceptible, and a change of 10 dB is perceived as twice

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or half as loud (Caltrans 2013). A doubling of sound energy results in a 3 dB increase in sound, which means that a doubling of sound energy (e.g., doubling the number of daily trips along a given road) would result in a barely perceptible change in sound level.

Sound may be described in terms of level or amplitude (measured in dB), frequency or pitch (measured in hertz or cycles per second), and duration (measured in seconds or minutes). Because the human ear is not equally sensitive to sound at all frequencies, a special frequency-dependent rating scale is used to relate noise to human sensitivity.

The A -weighted decibel ( dBA) scale performs this compensation by discriminating against low and very high frequencies in a manner approximating the sensitivity of the human ear. Table 1 provides examples of common noise levels in the indoor and outdoor environment, expressed using the dBA scale.

Several descriptors of noise (a.k.a., noise metrics) exist to help predict average community reactions to the adverse effects of environmental noise, including traffic -generated noise. These descriptors include the equivalent noise level over a given period (L eq), the day–night average noise level (L dn), and the community noise equivalent level (CNEL). Each of these descriptors uses units of dBA.

Table 1
Typical Noise Levels Associated With Common Activities

Common Outdoor Activities Noise Level
(dBA)
Common Indoor Activities
110 Rock Band
Jet Flyover at 1,000 feet 105
Gas Lawn Mower at three feet 95
Diesel Truck at 50 feet, 50 mph 85 Food Blender at 3 feet 80 Garbage Disposal at 3 feet
Noisy Urban Area, Daytime 75
70 Vacuum Cleaner at 10 feet
Commercial Area 65 Normal speech at 3 feet
Heavy Traffic at 300 feet 60
55 Large Business Office
Quiet Urban Daytime 50 Dishwasher (in next room)
Quiet Urban Nighttime 40 Theater, Large Conference Room (background) Quiet Suburban Nighttime 35
30 Library
Quiet Rural Nightime 25 Bedroom at Night, Concert Hall (background) 15 Broadcast/Recording Studio
Lowest Threshold of Human Hearing (Healthy) 0 Lowest Threshold of Human Hearing (Healthy) Source: Caltrans 2013.

Notes: dBA = A-weighted decibel; mph = miles per hour.

Leq is a decibel quantity that represents the constant or energy-averaged value equivalent to the amount of variable sound energy received by a receptor during a time interval. For example, a 1 -hour L eq measurement of 60 dBA would represent the average amount of energy contained in all the noise that occurred in that hour. L eq is an effective noise descriptor because of its ability to assess the total time -varying effects of noise on sensitive receptors, which can then be compared to an established Leq standard or threshold of the same duration. Another descriptor is maximum sound level ( Lmax), which is the greatest sound level measured during a des ignated time interval or event. The minimum sound level (Lmin) is often called the floor of a measurement period.

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Unlike the Leq, Lmax, and Lmin metrics, Ldn and CNEL descriptors always represent 24-hour periods and differ from a 24-hour Leq value because they apply a time-weighted factor designed to emphasize noise events that occur during the non-daytime hours (when speech and sleep disturbance is of more concern). Time weighted refers to the fact that Ldn and CNEL penalize noise that occurs during certain sensitive periods. In the case of CNEL, noise occurring during the daytime (7:00 a.m. to 7:00 p.m.) receives no penalty. Noise during the evening (7:00 p.m. to 10:00 p.m.) is penalized by adding 5 dB to the actual levels , and nighttime (10:00 p.m. to 7:00 a.m.) noise is penalized by adding 10 dB to the actual levels . Ldn differs from CNEL in that the daytime period is longer (defined instead as 7:00 a.m. to 10:00 p.m.), thus eliminating the dB adjustment for the evening period. L dn and CNEL are the predominant criteria used to measure roadway noise affecting residential r eceptors. These two metrics generally differ from one another by no more than 0.5–1 dB and are often considered or actually defined as being essentially equivalent by many jurisdictions.

Exterior Noise Distance Attenuation
Noise sources are classified in two forms: (1) point sources, such as stationary equipment or a group of construction vehicles and equipment working within a spatially limited area at a given time, and (2) line sources, such as a roadway with a large number of pass -by sources (motor vehic les). Sound generated by a point source typically diminishes (attenuates) at a rate of 6.0 dBA for each doubling of distance from the source to the receptor at acoustically “hard” sites and at a rate of 7.5 dBA for each doubling of distance from source to receptor at acoustically “soft” sites. Sound generated by a line source (i.e., a roadway) typically attenuates at a rate of 3 dBA and 4.5 dBA per doubling distance, for hard and soft sites, respectively. Sound levels can also be attenuated by man-made or natural barriers.

For the purpose of sound attenuation discussion, a “hard” or reflective site does not provide any excess ground - effect attenuation and is characteristic of asphalt or concrete ground surfaces, as well as very hard -packed soils.

An acoustically “soft” or absorptive site is characteristic of unpaved loose soil or vegetated ground.

Vibration Fundamentals
Vibration is oscillatory movement of mass (typically a solid) over time. It is described in terms of frequency and amplitude and, unlike sou nd, can be expressed as displacement, velocity, or acceleration. For environmental studies, vibration is often studied as a velocity that, akin to the discussion of sound pressure levels, can also be expressed in dB as a way to cast a large r ange of quantities into a more convenient scale and with respect to a reference quantity. Vibration impacts to buildings are generally discussed in terms of inches per second (ips) peak particle velocity (PPV), which will be used herein to discuss vibration levels for ease of reading and comparison with relevant standards.

Vibration can also be annoying and thereby impact occupants of structures, and vibration of sufficient amplitude can disrupt sensitive equipment and processes (Caltrans 2020), such as thos e involving the use of electron microscopes and lithography equipment . Common sources of vibration within communities include construction activities and railroads. Groundborne vibration generated by construction projects is usually highest during pile driving, rock blasting, soil compacting, jack hammering, and demolition-related activities where sudden releases of subterranean energy or powerful impacts of tools on hard materials occur. Depending on their distances to a sensitive receptor, operation of l arge bulldozers, graders, loaded dump trucks, o r other heavy construction equipment and vehicles on a construction site also have the potential to cause high vibration amplitudes.

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Health Effects of Noise
Excessively noisy conditions can affect an individual’s quality of life, health, and well-being. The effects of noise can be organized into six broad categories: sleep disturbance, permanent hearing loss, human performance and behavior, social interaction or communication, extra-auditory health effects, and general annoyance. An individual’s reaction to noise and its level of disturbance depends on many factors such as the source of the noise, its loudness relative to the background noise level, time of day, whether the noise is temporary or permanent, and su bjective sensitivity.

78 SYCAMOREAVE

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Project Location
San Marcos Restaurant Row
SOURCE: SANGIS 2020, 2022
Date: 3/22/2023 - Last saved by: agreis - Path: Z:\Projects\j1384401\MAPDOC\DOCUMENT\InitialStudy\Figure1-ProjectLocation.m xd 02 , 0 0 0 1,000
Feet
Project Boundary
FIGURE 1
Chula Vista
Solana Beach
Encinitas
San Diego
Carlsbad
Oceanside
La Mesa El Cajon
Santee
Poway
San Marcos
Escondido
Vista
Imperial
Beach
Del Mar
Coronado
Riverside
County
Mexico
905
209
75 52
54 94
241
98 73
125
274
195
56 78
86 111
67 74
74 76 79
805
215
15 5
8 Project Site

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9'-0"

EXISTING
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EXISTING
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9'-0"18'-0"
SPECIA
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ETBACK F
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SAN M
ARCOS:
61 FE

ET FROM

CENTERLIN
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616'-6
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30'-6"
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SETBACK
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Scale: 1" = 50'-0"

TOWN OVER COMMERCIAL
3 Bedroom 8 du
Sub-Total 8 du

FRONT STREET TOWNHOMES
3 Bedroom 7 du
4 Bedroom 8 du
Sub-Total 17 du

GREENCOURT TOWNHOMES
2 Bedroom 29 du
3 Bedroom 13 du
4 Bedroom 15 du
Sub-Total 57 du
MOTORCOURT TOWNHOMES (120du/3.9ac = 30.8 du/ac)
2 Bedroom 78 du
3 Bedroom 42 du
Sub-Total 120 du
Grand Total: 202 units
Total Commercial: 10,400 sf

PARKING
Parking Required
2 Bedrooms: 107x1.75 188 spaces
3+ Bedrooms: 95x2 190 spaces
Guest: 202/3 68 spaces
Total 446 spaces
Parking Provided
Front Street Towns 34 spaces
Towns over Commercial 16 spaces
Court Towns 114 spaces
Garage Motocourt 228 spaces
Open Parking:

Standard 59 spaces
EVCS 3 spaces
EVCS Van 1 space
EV Ready 17 spaces
Accessible 4 spaces
Accessible Van 1 space
Open Parking Total (85 spaces)
Total 477 spaces

PRIVATE OPEN SPACE
Greencourts 4,460 sf
Motorcourts 9,876 sf
Town over Commercial 10,032 sf
Total 24,368 sf (.56 acres)

PRODUCT TYPE INFO
OCCUPANCY GROUP:
(CBC SECTION 310)
SEPARATIONS:
(CBC SECTION 420.2)

TYPE OF CONSTRUCTION

FIRE RESISTIVE RATING

REQUIREMENTS FOR
BUILDNG ELEMENTS.

FIRE RESISTIVE RATING

REQUIREMENTS FOR

EXTERIOR WALLS BASED

ON FIRE SEPARATION
DISTANCE:
(TABLE 602)
MIXED USE 1 ZONE: MU-1 R-2/U (PRIVATE

GARAGES) - SEPARATED OCCUPANCIES
WALLS SEPARATING DWELLING UNITS - 1/2 HOUR
FIRE PARTITION PER CBC SECTION 708.3,
EXCEPTION #2

TYPE VB
REFER TO TABLE 601
(NO RATING IS REQUIRED PER TABLE 601)
FIRE SEPARATION DISTANCE > 10' FOR TYPE VB
CONSTRUCTION AND R-2 OCCUPANCY SHALL BE
ZERO (0)
(NON-RATED) FIRE SEPARATION DISTANCE < 10'
FOR TYPE VB CONSTRUCTION AND R-2
OCCUPANCY SHALL BE ONE (1) - (1 HOUR)

REFER TO SITE PLAN, FOR ACTUAL DIMENSIONS

BETWEEN BUILDINGS
ALLOWABLE HEIGHT:
(CBC TABLE 504.3)
ACTUAL HEIGHT:

ALLOWABLE STORIES:
(CBC TABLE 504.4)
FIRE SPRINKLERS:

MAXIMUM AREA OF
EXTERIOR WALL OPENINGS:

ALLOWABLE FLOOR AREA:

ACCESSIBILITY:
60 FEET (HEIGHT INCREASE USED)
±40'-0"
3 STORIES
NFPA 13 PER CBC SECTION 903.3.1.1

UNPROTECTED, SPRINKLERED - PER
C.B.C. TABLE 705.8, SEE SITE PLAN FOR

FIRE SEPARATION DISTANCE

SEE TABLE

SHALL COMPLY WITH CBC CHAPTER
1102A.3 MULTI-STORY DWELLINGS

REFER TO SITE PLAN FOR MORE

INFORMATION
CONDOMINIUMS (R-2/U)

DEVELOPMENT NOTES
- SECTION 20.225.040 - MIXED USE 1 ZONE: THE MU-1 ZONE SHOULD

INCORPORATE RETAIL STOREFRONTS, URBAN LIVING, AND COMMUNITY DESTINATIONS IN A VERTICAL PEDESTRIAN-ORIENTED SETTING. THESE USES

MAY BE MIXED VERTICALLY ON SEPARATE FLOORS OF A BUILDING, OR

HORIZONTALLY IN SEPARATE BUILDINGS ON A SINGLE SITE OR ADJACENT PARCELS. TO MAINTAIN A PEDESTRIAN SCALE AND ORIENTATION, PERMITTED

USES ON THE GROUND FLOOR ARE LIMITED TO RETAIL AND OTHER ACTIVE USES. THE MU-1 ZONE IS INTENDED TO IMPLEMENT AND IS CONSISTENT WITH THE MIXED USE 1 (MU1) LAND USE DESIGNATION OF THE GENERAL PLAN. - TABLE 20.225-1 - C BUILDING FRONTAGE AND ACTIVE USE REQUIREMENTS:

PEDESTRIAN-ORIENTED GROUND FLOOR USES ARE REQUIRED FOR EIGHTY PERCENT (80%) OF THE BUILDING FRONTAGE ALONG PRIMARY STREET FRONTAGE, AND FACING PUBLIC OPEN SPACES OR PLAZAS.
- FORM-BASED REGULATION FIGURE 20.225-1: FIGURE 20.225-1 IS THE REGULATING PLAN FOR THE MIXED USE ZONES. THE REGULATING PLAN

FURTHER MODIFIES THE ZONING DESIGNATIONS OF THE ZONING MAP BY

ADDING FORM-BASE STANDARDS SUCH AS SETBACK TYPES, AND
PLACE-ORIENTED REGULATIONS TO EACH ZONE. THE DEVELOPMENT STANDARD TABLES OF EACH MIXED USE ZONE (TABLES 20.225-1, 20.225-2,

20.225-3, AND 20.225-4) REFERENCE FEATURES AND LOCATIONS REPRESENTED ON THE REGULATING PLAN.

SO
URCE: KY
GY Architectu
re + Plan
ning, 200
2; Lennar 2023
Z:\Projects\j1384401\MAPDOC\DOCUMENT\InitialStudy
FIGURE 2
Conceptual Site Plan
San Marcos Restaurant Row

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2 Regulatory Setting
Regulatory Setting
Federal
Federal Transit Administration
In its Transit Noise and Vibration Impact Assessment guidance manual, the Federal Transit Administration (FTA) recommends a daytime construction noise level threshold of 80 dBA L eq over an 8-hour period (FTA 2018) when detailed construction noise assessments are performed to evaluate potential impacts to community residences surrounding a project. Although this FTA guidance is not a regulation, it can serve as a quantified standard in the absence of such limits at the state and local jurisdictional levels.

State
California Department of General Services, California Code of Regulations, Title 24 Title 24 of the California Code of Regulations sets standards that new development in California must meet.

According to Title 24, Chapter 12, Section 1206.4, interior noise levels are not to exceed 45 dB A CNEL in any habitable room (California Building Code 2022).

California Department of Health Services Guidelines
The California Department of Health Services has developed guidelines of community noise acceptability for use by local agencies (OPR 2003). Selected relevant levels are listed here:
• Below 60 dBA CNEL: normally acceptable for low-density residential use • 50 to 70 dBA: conditionally acceptable for low-density residential use • Below 65 dBA CNEL: normally acceptable for high -density residential use and transient lodging • 60 to 70 dBA CNEL: conditionally acceptable for high -density residential, transient lodging, chu rches, educational, and medical facilities
California Department of Transportation
In its Transportation and Construction Vibration Guidance Manual (Caltrans 2020), the California Department of Transportation (Caltrans) recommends 0.5 inches per second (ips) peak particle velocity (PPV) as a threshold for the avoidance of structural damage risk to typical newer residential buildings exposed to continuous or frequent intermittent sources of groundborne vibration. For transient vibration events, such as blasting, the damage risk threshold would be

1.0 ips PPV (Caltrans 2020) at the same type of newer residential structures. For older structures, these guidance thresholds would be more stringent: 0.3 ips PPV for continuous/intermittent vibration sources, and 0.5 ips PPV for transient vibration events. With respect to human annoyance, Caltrans guidance indicates that building occupants exposed to groundborne vibration of 0.10 ips PPV from continuous or frequently intermittent sources may find it “strongly perceptible” (Caltrans 2020) and on such basis would thus be considered a significant groundborne vibration impact for purposes of this assessment. Although these Caltrans guidance thresholds are not regulations, they can serve as quantified standards in the absence of such limits at the local jurisdictional level.

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Local
The following are summarized or reproduced portions of relevant City regulations and General Plan policies.

San Marcos
City of San Marcos Municipal Code
The City of San Marcos Municipal Code Chap ter 10.24: Noise (San Marcos 2017) addresses construction noise.

Erection and demolition of buildings is exempt between 7:00 a.m. and 6:00 p.m. Monday through Friday and on Saturdays from 8:00 a.m. to 5:00 p.m. The Municipal Codes does not set noise limits on construction activities.

Commonly, the City has utilized the County of San Diego’s Noise Ordinance noise limit of 75 dBA (8-hour average) for construction activities.

Chapter 20.300 (Site Planning and General Development Standards) of the City’s Municipal Code includes noise regulations in the form of noise standards by zone (Section 20.300.070, Performance Standards). It should be noted that Municipal Code noise standards typically pertain to stationary (i.e., non -transportation-related) noise sources. The relevant portions of these noise standards are provided below:

1. Noise shall be measured with a sound-level meter that meets the standards of the American National Standards Institute (ANSI) (Section S1.4 -1979, Type 1 or Type 2). Noise levels shall be measured in decibels at the property line of the receptor property, and at least five (5) feet above the ground and ten (10) feet from the nearest structure or wall. The unit of measure shall be designated as an A - weighted decibel (dBA) Leq standard. A calibration check shall be made of the instrument at the time any noise measurement is made (Ord. No. 2017-1446, 7-25-2017)

2. No person shall create or allow the creation of exterior noise that causes the noise level to exceed the noise standards established by Table 20.300 -4 [shown in this report as Table 2, following page ].

Increases in allowable noise levels listed in Table 20 .300-4 may be permitted in accordance with the standards outlined in Table 20.300-5 [shown in this report as Table 3, following page].

3. No person shall create nor allow the creation of noise that causes the interior noise level when measured within a dwelling unit to exceed forty-five (45) dBA at any time, except as permitted by Table 20.300-6 [shown in this report as Table 4, following page].

4. Use of compressors or other equipment, including vents, ducts, and conduits, but excluding window or wall-mounted air conditioners, that are located outside of the exterior walls of any building, shall be enclosed within a permanent, non-combustible, view-obscuring enclosure to ensure that the equipment does not emit noise in excess of the ANSI standards.

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Table 2. Exterior Noise Standards by Zone
Zone
Allowable Noise Level
(dBA Leq) Measured
from the Property Line
Single-Family Residential (A, R-1, R-2) 1, 2
7 a.m. to 10 p.m. (daytime) 60
10 p.m. to 7 a.m. (overnight) 50
Multifamily Residential (R-3) 1, 2
7 a.m. to 10 p.m. (daytime) 65
10 p.m. to 7 a.m. (overnight) 55
Commercial (C, O-P, SR) 3
7 a.m. to 10 p.m. (daytime) 65
10 p.m. to 7 a.m. (overnight) 55
Industrial
7 a.m. to 10 p.m. (daytime) 65
10 p.m. to 7 a.m. (overnight) 60
Source: City of San Marcos 2017 (Table 20.300-4)
Notes:
1 For single-family detached dwelling units, the "exterior noise level" is defined as the noise level measured at an outdoor living area which adjoins and is on the same lot as the dwelling, and which contains at lea st the following minimum net lot area: (i) for lots less than 4,000 square feet in area, the exterior area shall include 400 square feet, (ii) for lots between 4,000 square feet to 10 acres in area, the exterior area shall include 10 percent of the lot are a; (iii) for lots over 10 acres in area, the exterior area shall include 1 acre.
2 For all other residential land uses, "exterior noise level" is defined as noise measured at exterior areas which are provided for private or group usable open space purposes . "Private Usable Open Space" is defined as usable open space intended for use of occupants of one dwelling unit, normally including yards, decks, and balconies. When the noise limit for Private Usable Open Space cannot be met, then a Group Usable Open Spa ce that meets the exterior noise level standard shall be provided. "Group Usable Open Space" is defined as usable open space intended for common use by occupants of a development, either privately owned and maintained or dedicated to a public agency, norma lly including swimming pools, recreation courts, patios, open landscaped areas, and greenbelts with pedestrian walkways and equestrian and bicycle trails, but not including off-street parking and loading areas or driveways.
3 For non-residential noise sensitive land uses, exterior noise level is defined as noise measured at the exterior area provided for public use.

Table 3. Permitted Increase in Exterior Noise Levels
Permitted Increase (dBA) Duration (cumulative minutes per hour) 5 15
10 5
15 1
20 Less than 1 minute
Source: City of San Marcos 2017 (Table 20.300-5)
Table 4. Permitted Increase in Interior Noise Levels
Permitted Increase (dBA) Duration (cumulative minutes per hour) 5 1
10 Less than 1 minute
Source: City of San Marcos 2017 (Table 20.300-6)

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City of San Marcos General Plan
To control transportation related noise sources such as arterial roads, freeways, airports, and railroads, the City of San Marcos has established guidelines for acceptable community noise levels in the Noise Element of the General Plan (City of San Marcos 2012). For noise -sensitive rural and single -family residential uses, schools, libraries, parks, and recreational areas the City Noise Element requires an exterior noise levels of le ss than 60 dBA CNEL for outdoor usable area. For multi -family developments the standard is 65 dBA CNEL and a standard of 70 dBA CNEL is typically applied to commercial uses. The City has also established an interior noise limit of 45 dBA CNEL for all resid ential uses.

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3 Existing Conditions
Sound pressure level (SPL) measurements were conducted near the proposed project site on June 24, 2022, to quantify and characterize the existing outdoor ambient sound levels. Table 5 provides the location, date, and time period at which these baseline noise level measurements were performed by an attending Dudek field investigator using a Rion -branded Model NL -52 sound level meter (SLM) equipped with a 0.5 -inch, pre-polarized condenser microphone with pre-amplifier. The SLM meets the current American National Standards Institute standard for a Type 1 (Precision Grade) sound level meter. The accuracy of the SLM was verified using a field calibrator before and after the measurements, and the measurements were conducted with the microphone positioned approximately five feet above the ground.

Four (4) short-term (ST) noise level measurement locations (ST1 – ST4) intended to be representative of the outdoor ambient sound environment for existing or potential future noise-sensitive receivers in the vicinity of the proposed project were selected near the proposed project site. These locations are depicted as receivers ST1 – ST4 on Figure 3, Noise Measurement Locations. The measured Leq and Lmax noise levels at these surveyed locations are provided in Table 5. The primary noise sources at the sites identified in Table 5 consisted of traffic along adjacent roadways, the sounds of leaves rustling, and birdsong. As shown in Table 5, the measured SPL ranged from 63.5 dBA Leq at ST2 to 74 dBA Leq at ST1. Beyond the summarized information presented in Table 5, detailed noise measurement data is included in Appendix A, Baseline Noise Measurement Field Data.

Table 5. Measured Baseline Outdoor Ambient Noise Levels Site Location/Address Date/Time Leq Lmax
ST1 South side of San Marcos Blvd. East of
Project site, adjacent to pre-school.
2022-06-24, 09:40
AM to 09:55 AM 74 83
ST2 West side of Via Vera Cruz, East of Project
site.
2022-06-24, 10:10
AM to 10:25 AM 63.5 74.5
ST3 Northern Project site boundary, adjacent to
parking lot and The Father’s House church.
2022-06-24, 10:30
AM to 10:45 AM 46.5 58.1
ST4 East side of S. Las Posas Road, West of
Project site,
2022-06-24, 10:50
AM to 11:05 AM 64.9 74.5
Source: Appendix A.

Notes: Leq = equivalent continuous sound level (time -averaged sound level); L max = maximum sound level during the measurement interval; dBA = A-weighted decibels; ST = short-term noise measurement locations.

Generally, the measure d samples of daytime L eq agree with expectations: ST1 is 74 dBA L eq due largely to its proximity to San Marcos Boulevard , a major roadway and thus fairly continuous acoustical contributor to the measured outdoor ambient sound environment. Likewise, ST2 and ST4 are located adjacent to relatively busy roadways, with daytime Leq values of approximately 65 and 65 dBA, respectiv ely; these roadways would also produce fairly continuous contributions to the ambient noise environment. Surrounding land uses include restaurant, commercial office and retail to the east, mixed commercial and light industrial and a church to the north, commercial retail, restaurant, and movie theater to the west, and a plant nursery and RV storage yard to the south.

The nearest noise-sensitive land use is a church located approximately 50 feet to the north of the proposed project northern boundary (near ST3). The second closest noise-sensitive use is a pre-school that is located on San Marcos Boulevard approximately 850 feet to the east of the proposed project eastern boundary (near ST1).

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L I ND A VI S TA DR

MCMAHR RD

LINDA VISTA DR

BOARDWALK

RYAN DR

PARK PL

COMMERCE ST

STONE DR

VIA VERA CRUZ
S
LAS
POSAS
RD

W SAN MARCOS BLVD
ST1
ST2
ST3
ST4
Locations of Short-Term Noise Measurements
San Marcos Restaurant Row
SOURCE: SANGIS 2020, 2023
0 300 150
Feet
Project Boundary
Noise Measurement Location
Short-Term
FIGURE 3

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4 Thresholds of Significance
The following significance criteria are based on Appendix G of the California Environmental Quality Act Guidelines (14 CCR 15000 et seq.) and will be used to determine the significance of potential noise impacts. Impacts to noise would be significant if the proposed project would result in the following:
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 applica ble standards of other agencies;
b. Generation of excessive groundborne vibration or groundborne noise levels; and c. Expose people residing or working in the project area to excessive noise levels (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 2 miles of a public airport or public use airport).

In light of these above significance criteria, this analysis uses the following standards to evaluate potential noise and vibration impacts.
• Construction noise – The City of San Marcos Municipal Code Chapter 10.24: Noise (San Marcos 2017) addresses construction noise. Erection and demolition of buildings is exempt between 7:00 a.m. and 6:00 p.m. Monday through Friday and on Saturdays from 8:00 a.m. to 5:00 p.m. The Municipal Code does not set noise limits on construction activities. Through adherence to the limitation of allowable construction times provided in the City of San Marcos Municipal Code , the construction-related noise levels would not exceed local standards. However, were the City to consider adoption of the County of San Diego’s Noise Ordinance noise limit of 75 dBA (8 -hour Leq) for construction activities, then for information purposes this assessment will compare predicted construction noise against the County’s 75 dBA 8-hour Leq threshold. The analysis assumes that the 8-hour period over which the County’s 75 dBA Leq could apply would be within the aforementioned exempt hours as allowed by the City of San Marcos. • Off-site project-attributed transportation noise – For purposes for this analysis, a direct roadway noise impact would be considered significant if increases in roadway traffic noise levels attributed to future residential development as a result of the proposed project were greater than 3 dBA CNEL at an existing noise-sensitive land use.
• Off-site project -attributed stationary noise – For purposes for this analysis, a noise impact would be considered significant if noise from typical operation of heating, ventilation, and air conditioning and other electro-mechanical systems associated with future residential development as a result of the proposed project exceeded 65 dBA hourly Leq for multi-family homes and 60 dBA hourly Leq for single-family homes at the property line from 7:00 a.m. to 9:59 p.m., and 55 dBA hourly Leq for multi-family homes and 50 dBA hourly Leq for single-family homes from 10:00 p.m. to 6:59 a.m. • Construction vibration – Guidance from Caltrans indicates that a vibration velocity level of 0.2 ips PPV received at a s tructure would be considered annoying by occupants within (Caltrans 2013b). As for the receiving structure itself, aforementioned Caltrans guidance from Section 2 recommends that a vibration level of 0.3 ips PPV would represent the threshold for building damage risk.

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For purposes of disclosure, since current CEQA noise criteria listed above do not consider it, this analysis also evaluates compatibility of on-site traffic noise exposure levels with the City of San Marcos exterior noise standards of 65 dBA CNEL for multi-family homes and 60 dBA CNEL for parks and recreation areas, and with the adopted residential interior noise standard of 45 dBA CNEL..

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5 Impact Discussion
a) Would the project 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 applicable standard of other agencies?
Short-Term Construction
Construction noise and vibration are temporary phenomena. Construction noise and vibration levels vary from hour to hour and day to day, depending on the equipment in use, the operations performed, and the distance between the source and receptor.

Construction assumptions, including timing, phasing, and equipment type and quantity, as well as worker and vendor truck trips, were based on information provided by the applicant. Default values provi ded by the California Emissions Estimator Model (CalEEMod) were used since detailed project site -specific information is not currently available. Equipment that could be in use during construction would include, in part, graders, backhoes, concrete saws, excavators, dump trucks, loaders, cranes, manlifts, cement mixers, pavers, rollers, welders, and air compressors. The typical maximum noise levels for various pieces of construction equipment at a distance of 50 feet are presented in Table 6. Usually, construction equipment operates in alternating cycles of full power and low power, producing ave rage noise levels over time that are less than the listed maximum noise level. The average sound level of construction activity also depends on the amount of time that the equipment operates and the intensity of construction activities during that time.

Table 6. Typical Construction Equipment Maximum Noise Levels Equipment Type Typical Equipment (Lmax, dBA at 50 Feet) Air compressor 78
Backhoe 78
Concrete pump truck 81
Grader 85
Crane 81
Roller 80
Manlift 75
Generator 72
Front End Loader 79
Paver 77
Scraper 84
Welder 74
Source: DOT 2006.

Note: Lmax = maximum sound level; dBA = A-weighted decibels.

Aggregate noise emission from assumed construction activities, broken down by sequential phase, was predicted at three distances to the nearest apparent existing noise-sensitive receptor: 1) from the nearest position of the construction site boundary ; 2) from the nearest position of constructi on activity for the “main” portion of the site (the closest receiver to construction activity is adjacent to the northern extension

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of the Project site, which would contain six multi--family residential structures); and , 3) from the geographic center of t he construction site, which serves as the time -averaged location or geographic acoustical centroid of active construction equipment for the phase under study.

The intent of the first distance is to help evaluate anticipated construction noise from a limited quantity of equipment or vehicle activity expected to be at the boundary for some period of time, which would be most appropriate for phases such as site preparation, grading, and paving within the northern site extension .

The intent of the second distance is to address the closest construction activity within the main portion of the Project site, which is located substantially further from the adjacent noise-sensitive receiver than the northern extension of the Project site. Since construction within th e northern site extension would have a much shorter duration, the distance to the main site represents the highest average noise levels that would occur at the northern portion of the main Project site, at the closest off -site sensitive receiver. The third distance is used in a manner similar to the general assessment technique as described in Federal Transit Administration (FTA) guidance for construction noise assessment (FTA 2018), when the location of individual equipment for a given construction phase is uncertain over some extent of (or the entirety of) the construction site area. Because of this uncertainty, all the equipment for a construction phase is assumed to operate—on average—from the acoustical centroid. Table 7 summarizes these three distances to the apparent closest noise-sensitive receptor for each of the five sequential construction phases. Adoption of San Diego County’s noise ordinance threshold would mean that an “occupied property”, which could be a residence or any occupied building, would be the nearest noise-sensitive receptor in this context. At the site boundary, this analysis assumes that the equipment may be operating up to all of eight (8) hours per day (i.e., comparable to a typical on-site work shift).

Table 7. Estimated Distances between Construction Activities and the Nearest Noise- Sensitive Receptors
Construction Phase (and
Equipment Types Involved)
Distance from Nearest
Noise-Sensitive
Receptor to
Construction Site
Boundary – North
Extension
(Feet)
Distance from Nearest
Noise-Sensitive
Receptor to Main Site
Construction Boundary
(Feet)
Distance from Nearest
Noise-Sensitive Receptor
to Acoustical Centroid of
Site (
Feet)
Demolition (Concrete Saw,
Excavator, Dozer) 50 300 525
Site Preparation (Backhoe,
Dozer) 50 300 525
Grading (Excavator, Grader,
Dozer, Scraper, Backhoe) 50 300 525
Building Construction
(Crane, Forklift, Backhoe,
Welder, Generator)
50 300 525
Architectural Finishes (Air
Compressor) 50 300 525
Paving (Roller, Paver, Mixer
Truck) 50 300 525

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A Microsoft Excel –based noise prediction model emulating and using reference data from the Federal Highway Administration Roadway Construction Noise Model (RCNM) (FHWA 2008) was used to estimate construction noise levels at the nearest occupied noise-sensitive land use. (Although the RCNM was funded and promulgated by the Federal Highway Administration, it is often used for non-roadway projects, because the same types of construction equipment used for roadway projects are often used for other types of construction.) Input variables for the predictive modeling consist of the equipment type and number of each (e.g., two graders, a loader, a tractor), the duty cycle for each piece of equipment (e.g., percentage of time within a specific time period, such as an hour, when the equipment is expected to operate at full power or capacity and thus make noise at a level comparable to what is presented in Table 6, Typical Construction Equipment Maximum Noise Levels), and the distance from the noise -sensitive receiver. The predictive model also considers how many hours that equipment may be on site and operating (or idling) within an established work shift. Conservatively, no topographical or structural shielding was assumed in the modeling. The RCNM has default duty-cycle values for the various pieces of equipment, which were derived from an extensive study of typical construction activity patterns. Those default duty-cycle values were used for this noise analysis, which is detailed in Appendix B, Construction Noise Modeling Input and Output, and produce the predicted results displayed in Table 8.

Table 8. Predicted Construction Noise Levels per Activity Phase Construction Phase (and Equipment Types Involved)
8-Hour Leq at
Nearest Noise-
Sensitive Receptor
to Construction
Site Boundary
(dBA)
8-Hour Leq at
Nearest Noise-
Sensitive
Receptor to Main
Construction Area
(dBA)
8-Hour Leq at
Nearest Noise-
Sensitive
Receptor to
Acoustical
Centroid of
Site (dBA)
Demolition (Concrete Saw, Excavator, Dozer) 86.8 71.2 66.4 Site Preparation (Backhoe, Dozer) 84.6 69.1 64.2
Grading (Excavator, Grader, Dozer, Scraper, Backhoe) 87.3 71.8 66.9 Building Construction (Crane, Forklift, Backhoe,
Welder, Generator)

85.3 69.7 64.9
Architectural Finishes (Air Compressor) 81.9 66.3 61.4
Paving (Roller, Paver, Mixer Truck) 72.8 57.2 52.3
Notes: Leq = equivalent noise level; dBA = A-weighted decibels.

As presented in Table 8, the estimated construction noise levels at the closest noise -sensitive receptor (church) are predicted to be greater than 75 dBA Leq even averaged over an 8-hour period, when activities take place within the rectangular extended site area at the northern end of the Project site. Note that these estimated noise levels at a source -to-receiver distance of 5 0 feet occur when noted pieces of heavy equipment would each operate for a cumulative period of 8 hours a day along the northern property boundary of the northern site extension area. Although construction noise at the closest off-site noise-sensitive receiver could exceed the County of San Diego threshold, the analysis of these noise levels is extremely conservative, because it assumes all equipment in the phase is working simultaneously along the northern boundary. Given the analysis at this distance is very conservative, and because San Marcos has not adopted the San Diego County ordinance, construction noise i mpacts even within the northern site extension area would be considered less than significant..

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The site extension area at the north end of the Project site has a depth of approximately 300 feet, as measured perpendicular to the closest noise-sensitive receptor. The construction noise model was run with this distance separation for construction activities, the results of which are also presented in Table 8 (Nearest Noise Sensitive Receptor to Main Construction Area). As can be seen in Table 8, the estimated construction noise levels at the closest noise-sensitive receptor (church) are predicted to be less than 75 dBA Leq averaged over an 8-hour period, when activities take place no closer than the boundary of the main Project site (along the northern Project site boundary, excluding the extension or pop -out near the middle of the northern Project site boundary). Note that these estimated noise levels at a source -to-receiver distance of 300 feet occur when noted pieces of heavy equipment would each operate for a cumulative period of 8 hours a day. Therefore, for construction activities taking place within the main Project site boundaries (i.e., no closer than 300 feet to the adjacent church)., construction noise levels at the closest noise-sensitive receptor would comply with the San Diego County standard.

Finally, Table 8 provides the results of the construction noise analysis based upon the distance from the acoustical centroid to the closest noise-sensitive receptor. This scenario is meant to address construction activities distributed across the site, rather th an those occurring along the closest site boundary to the sensitive receptor. The values based on the acoustical centroid are considered to be more representative of average construction noise exposure levels at adjacent properties across the entire construction period. As illustrated in Table 8, noise levels based on the acoustical centroid would average no more than approximately 66 dBA, which is the equivalent of normal conversation levels. Thus, when considered over the entire construction process, it is anticipated that construction noise levels at the closest noise-sensitive receptor would not be intrusive or disruptive.

Compared to measurements of the daytime outdoor ambient sound level at representative sample locations as shown in Table 5, predicted construction noise levels ranging in the lower to middle seventies of A-weighted decibels as appearing in Table 8 are considerably higher and would be clearly perceptible to an average listener having healthy human hearing. However, there are no residences within 1,000 feet of the Project site; the nearest noise-sensitive uses are a church and a pre-school. At the nearby church and pre-school, exposure to such construction-related noise would typically be relatively short term and temporary—lasting only as long as construction occurs during allowable hours. And because it is anticipated that construction activities associated with future development as a result of the proposed project would take place within the hours of 7:00 a.m. and 6:00 p.m. Monday through Friday and on Saturdays from 8:00 a.m. to 5:00 p.m., the noise-producing activity would thus be in compliance with the City’s Municipal Code with respect to allowable hours.

Long-Term Operational
Roadway Traffic Noise
The proposed project’s residences and commercial space would result in the introduction of vehicle trips on local arterial roadways (i.e., San Marcos Boulevard, Via Vera Cruz, and South Las Posas). However, the project would eliminate several existing restaurants that have high trip generation rate s. According to the project local transportation assessment (Intersection Metrics, September 2022), the project would reduce average daily trips coming from the Project site, compared to the existing restaurants. Table 9 presents the conclusion of the traffic analysis, which is shown as estimated reduction of 4,659 average daily trips to local roadways.

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Table 9. Project Traffic Generation Versus Current Uses Traffic Land Use Units Trip Rate Average Daily Trips (ADT)
Multi-Family Units 202 Dwelling Units 6 /Dwelling Unit 1,212 Specialty Retail 10,400 Square Feet 40 / thousand sq. ft. 416 City Park 1.24 Acres 50 / Acre 62
Existing Uses (to be eliminated)
Existing Restaurants -63,484 100 / thousand sq. ft. -6,349 Net Trip Generation -- -- -4,659
Source: Intersecting Metrics, Old California Restaurant Row Local Transportation Assessment, September 2022.

Given the project would reduce traffic trips from the site to area roadways, traffic noise on area roadways would be reduced as a result of project implementation. Thus, a less-than-significant impact is expected for proposed project-related off-site traffic noise affecting existing residences in the vicinity.

Exterior Noise Exposure for Future Project Occupants
Aside from exposure to aviation traffic noise, current CEQA noise-related guidelines at the state level do not require an assessment of exterior -to-interior noise intrusion, environmental noise exposure to occupants of newly -created project residences, or environmental noise exposure to exterior non -residential uses attributed to the potential future development at the proposed project site. Nevertheless, the City’s CEQA guidelines and the California Building Code requires that interior background noise lev els not exceed a CNEL of 45 dB within habitable rooms. Hence, the following predictive analysis of traffic noise exposure and commercial noise sources at the exteriors of occupied residences and outdoor living areas is provided to support evaluation of the Project for Noise Element policy compliance.

Traffic Noise
Potential noise exposure for future project residents from vehicular traffic on adjacent roadways was assessed using worksheets based upon the Federal Highway Administration’s Traffic Noise Model version

2.5. Information used in the model included the roadway geometry, posted traffic speeds, and traffic volumes. The distances from the roadway centerline to the closest building façade adjacent to the roadway were used in the model to calculate roadw ay traffic noise from each roadway segment at the building façade oriented toward that roadway To model “existing” traffic noise levels, Dudek used traffic volume data from the City of San Marcos Public Works Division (https://www.san-marcos.net/departments/public- works/transportation-engineering/traffic-counts-adt-table) for the Year 2019. To project Year 2030 roadway volumes, Dudek assumed a 1.5% annual growth rate (which is representative of regional traffic growth in California and compares well to the current actual annual growth rate for San Marcos of 1.9% annually). Table 10 presents the results of traffic noise modeling . Appendix C contains the traffic noise spreadsheets. Note that proposed new driveways/roads interior to the project site were not assessed for noise generation, due to the much lower quantity of trips on these roadways compared to Las Posas or Via Vera Cruz, both of which were found to generate noise levels less than 60 dBA CNEL.

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Table 10. Roadway Traffic Noise Modeling Results
Roadway Segment /
Building Facades Facing
Existing
(2019 Counts)
ADT
Existing Traffic
Noise Exposure
Level
(dBA CNEL)
Year 2030
Predicted Traffic
ADT
Year 2030
Traffic Noise
Exposure Level
(dBA CNEL)
Las Posas Road. 10,951 57.1 12,758 57.8
San Marcos Blvd. 32,216 70.0 37,582 70.6
Via Vera Cruz 9,654 58.5 11,247 59.2
Source: Dudek Notes: dBA = A-weighted decibel; CNEL = Community Noise Equivalent Level; dB = decibel.

The traffic noise exposure levels in Table 10 are calculated for the Project boundary closest to the identified roadway segment. For Project boundaries closest to Las Posas Road and Via Vera Cruz, a number of existing structures exist between the roadway segment and the Project boundary. These existing buildings would provide some shielding for traffic noise propagation, and thus calculated roadway traffic noise levels along these Project boundaries would be lower than the calculated value presented in Table 10 (the values represent a conservative worst-case with no intervening buildings). The Project boundary adjacent to San Marcos Blvd. has unobstructed exposure to the street, and therefore the traffic noise value in Table 10 for San Marcos Boulevard represents expected future conditions, with no conservatism.

The proposed park would extend from the Project boundary closest to Las Posas Road to the Projec t boundary closest to Via Vera Cruz. From Table 10, the maximum traffic noise level exposure at the ends of the park closest to these roadways would be no greater than 59.2 dBA CNEL, which is below the Noise Element recommended 60 dBA CNEL maximum for par ks. Proposed residences along these Project boundaries would also be exposed to traffic noise levels below the Noise Element Policy limit of 65 dBA CNEL for multi-family residences.

The Project would place five rows of two -story structures between San Mar cos Blvd. and the park area, which would be expected to reduce traffic noise exposure within the park area by a minimum of 20 dBA CNEL. Therefore, traffic noise exposure levels from San Marcos Blvd. in the Park area would not be anticipated to exceed 50 dBA CNEL. Traffic noise exposure levels in the park area would therefore remain within the Noise Element policy limits of 60 dBA CNEL.

Based on the Year 2030 results of the above traffic noise analysis, the first row of structures adjacent to San Marcos Blvd. could have traffic noise levels in front yard areas and at the façade facing San Mar cos Blvd. of approximately 70 dBA CNEL. To achieve compliance with the Noise Element multi-family residential exterior exposure limits of 65 dBA CNEL in yard areas immediately adjacent to San Marcos Blvd., a solid fence or landscape wall of six (6) feet in height should be provided between the yard area and San Marcos Blvd. Such a wall would reduce traffic noise exposure in the yard areas to approximately 63 dBA CNEL.

The first building row adjacent to San Marcos Blvd. is proposed to be two stories in height, effectively spanning the Project property frontage except for one entry drive. This row of buildings would reduce traffic noise exposure at the next row of residences by a minimum of 10 dBA CNEL, and the further distance from the traffic noise source would reduce levels by another 3 dBA CNEL. Therefore, residences i nterior to the Project site would not be exposed to traffic noise exposure levels greater than approximately 57 dBA CNEL, comfortably within the Noise Element limit of 65 dBA CNEL.

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CCR Title 24 requires that an interior noise analysis be performed where ex terior noise exposure would exceed 60 dBA CNEL , which would be the case for the facades of the first row of buildings immediately adjacent to San Marcos Blvd.. CCR Title 24 and the City of San Marcos also require that interior noise levels due to exterior noise sources not exceed 45 dBA CNEL for multi-family residences. An interior noise analysis is not currently required under CEQA, but a preliminary discussion for informational purposes is provided .

No exterior wall assembly has been provided yet, b ut it is assumed the exterior wall for the Project structures will be of standard construction and consist of 3-coat stucco or exterior paneling over sheathing, on wood studs with a single layer of gypsum board on the interior and batt insulation in the ca vity. This assembly has an attenuation capacity of typically 40-45 (identified by a Sound Transmission Classification [STC] rating), which means the exterior solid wall could reduce exterior noise levels by at least 40 dBA in interior spaces. However, windows and doors are not as effective in reducing noise levels from exterior to interior spaces. Therefore, for residences in the first row of structures adjacent to San Marcos Blvd., to achieve the interior criterion of 45 dBA CNEL, exterior doors and windo ws located on the building façade facing San Marcos Blvd should have a minimum STC rating of 35.

Exterior Noise Exposure Levels From Adjacent Commercial Land Uses Existing commercial uses including restaurants, commercial offices, and a bank would be preserved on the property immediately to the east and north of the project site. Industrial enterprises would also be preserved on parcels to the north (with all work activity restricted to the interior of the structures ). Roof- mounted HVAC equipment on the clo sest restaurant to the eastern project site boundary is located approximately 100 feet from the eastern property boundary of the project site. Based on a Carrier brand 20-ton package HVAC unit, the sound level for the HVAC equipment at the closest restaurant would be 77 dBA at 10 feet, attenuated to approximately 59 dBA at the project site eastern boundary. Parking lots associated with the commercial uses north and east of the project site would be the primary noise source that would continue to exist adjacent to the project. The average noise level for a commercial parking lot is approximately 63 dBA Leq at 50 feet from the edge of the parking lot (Dudek 2020b). The closest parking stalls to the project site would be located at approximately 50 feet from future residences within the project.

Adding HVAC noise to the parking lot noise would result in n oise exposure no greater than approximately 66 dBA Leq at residences along the northern and eastern project site boundary . With standard residential construction capable of providing an exterior to interior attenuation of 25 dBA, interior noise levels should remain below 45 dBA L eq. The adjacent businesses would not be anticipated to operate between 10 PM and 7 AM, and therefore industrial and commercial uses should not result in interior noise levels within project homes that exceed 45 dBA CNEL. For the first row of residences along the northern and eastern Project site boundaries, noise could be marginally above the recommended exterior limits (66 dBA CNEL compared to a limit of 65 dBA CNEL) where yards are provided between the residences and the Project site boundary. Solid fencing or landscape walls six feet in height at the yard boundary closet to the Project site boundary would prevent exterior noise exposur e that exceeds the Noise Element limit at proposed yard areas adjacent to the northern and eastern Project site boundaries.

Exterior Noise Exposure - Recreational Noise Sources
The proposed recreation area within the project site illustrate s four proposed pickleball c ourts, at the extreme east end of the park site. The pickleball courts locations are between approximately 50 and 108 feet from the closest residence on the site ( immediately south of the pickleball courts ). Other on -site residences in the area (along the southern park boundary) would be located between 60 and 200 feet from the pickleball courts. Pickleball play has been demonstrated to generate average sound levels of approximately 64 dBA L eq at 30 feet (Dudek 2020a). Pickleball noise could average 6 2 dBA L eq at the

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closest on -site residence while all the courts are in use ; other on -site residences further away would experience lower pickleball noise levels. These noise levels would comply with the municipal code daytime limit of 65 dBA Leq for multi-family residence zoning. The pickleball courts would not be anticipated to be used in the nighttime period (i.e., later than 10 PM), and therefore would not need to comply with the nighttime municipal code limit of 55 dBA L eq. Daytime/evening only use of the pickleball courts would produce exterior noise levels no greater than 63 dBA CNEL at the closest residence, which would result in interior noise levels no greater than 38 dBA CNEL, given an exterior to interior attenuation performance for residential construction. While the pickleball noise would not be expected to exceed applicable limits in the City municipal code, the use of sound attenuating material on the court fences would reduce the potential for residence annoyance from pickleball play. Sound levels at the closest property line from pickleball play would attenuate to approximately 63 dBA Leq and therefore pickleball noise would also be compliant with the City municipal code limit of 65 dBA L eq within the commercial zone to the east of the Project site. The conceptual park plan also i llustrates a proposed lawn area with some casual tiered seating , with no proposed amplified sound system. In addition to the pickleball courts, p roposed active recreational uses include a tot lot and all-wheel rolling plaza (i.e., area for rollerblading, skating, skateboarding, etc.); neither of these two active recreation areas would be equipped with an amplified sound system . As such, sound levels generated by use of the tot lot and roller plaza would be antici pated to remain well below the municipal code daytime limit of 65 dBA Leq at the nearest multi-family residences; neither the tot lot nor roller plaza are anticipated to be open in the nighttime period . As a public Park, the Parks Department would need to issue a permit for a special event at the tiered lawn area or within other areas of the proposed Park. Due to the proximity of the Park to homes, it is anticipated the City would restrict special event permits to prohibit the use or portable amplified sound systems.

Stationary Operations Noise
Future residential and commercial development on the project site will add a variety of noise -producing mechanical equipment, primarily involving heating, ventilation, and air conditioning equipment for habitable spaces. While there would be some commercial space included in the proposed development, residential structures would be the dominant land use and the quantity of HVAC units would substantially outnumber the systems dedicated to commercial spaces Therefore this stationary equipment operations noise analysis focuses on residential space HVAC equipment. Within the park component, the only substantial noise source would be the proposed pickleball courts (discussed above). Modeling of Project stationary source noise levels at areas adjacent to the Project site does include both residential HVAC sources and the pickleball courts.

Prediction of stationary source operational noise attributed to the Project involved creation of a sound propagation model using a Dudek proprietary software tool. Dudek NoisePro is used for calculation, presentation, assessment, and prediction of environmental noise. Dudek used NoisePro to calculate the combined sound emission from the above -described air conditioner co ndensers and pickleball courts to predict sound levels at receiver points placed in the model. The outdoor noise propagation formulas in NoisePro follow the International Organization of Standardization (ISO) Standard 9613 -2, “Attenuation of Sound During Propagation Outdoors, Part 2: General Method of Calculation” (ISO 1996).

As proposed, structures would be arranged to create a relatively continuous building block along the exterior Project site. The gaps between structures would be minor compared to the length of connected structures and therefore the first row of buildings along the exterior lot boundary would present an effective sound barrier for stationary noise sources more internal to the Project Site. The noise model therefore includes air conditioner condenser units for the first row of building closest to the exterior perimeter of the Proje ct

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site. Dudek used the reference sound level (68 dBA at 1 meter) for a Carrier 16NA -48 5-ton HVAC unit to represent the HVAC system for each residential unit located along the Project site boundary. A total of 64 HVAC units were included in the model for the residences along the Project site boundaries. A sound level reference of 64 dBA at 30 feet was included in the model for each of the four pickleball courts. A total of seven receiver points were included in the model space, along the Project property boundary adjacent to concentrations of Project stationary noise sources, to represent the worst -case noise levels for simultaneous operation of all air conditioners in residential units along the site boundaries, and with games on each of the four pickleball courts.

Table 11 presents the results of the Project operational noise prediction modeling at the seven receiver locations (R1-R7) in the NoisePro model space, as well as at the two closest ambient noise measurement locations (ST2 and ST3). Refer to Figure 4 for the locations of R1-R7, ST2 and ST3. These modeled receptor positions are intended to represent Project operational sound levels along the Project Site property boundaries as well as at the noise-sensitive uses closest to the Project site, for comparison to City of San Marcos noise ordinance limits. Properties immediately adjacent to the Project Site include commercial land uses to the west, south and east, as well as north of the eastern half of the Project site, where the applicable municipal code limit in the overnight period is 55 dBA Leq. and during the daytime is 65 dBA Leq. Uses to the north of the western half of the Project Site are industrial, where the applicable municipal code limit in the overnight period is 60 dBA L eq. and during the daytime is 65 dBA L eq. As indicated in Table 11, Project operational noise levels at each modeled location except R4 and R5 would fall below the more stringent nighttime limit, indicating that even if all equipment is operating in the overnight period, the Project noise levels would comply. At receiver R4 and R5, the modeled noise levels reflect use of all four pickleball courts simultaneously. Since the courts would not be anticipated to be open in the overnight period from 10 PM to 7 AM, noise levels from the courts at the adjacent Project Site boundaries would be subject to the daytime limit for commercial zones of 65 dBA Leq; the modeled noise levels of 60 and 57 dBA Leq at the property lines adjacent to the Pickleball courts would comply with the commercial zone daytime limits of 65 dBA Leq.

NoisePro also generates an exhibit with noise contours depicting the noise levels resulting from project operations, that illustrates noise levels extending several hundred feet from the site. Refer to Figure 4 for the noise contour map from the NoisePro modeling.

Table 11. Stationary Noise Source Levels Compared to Noise Ordinance Receiver Description
Predicted
Noise Level
(dBA Leq)
Applicable
Sound Level
Limit (dBA Leq)
Limit
Exceeded?
R1 Midpoint of Eastern Project Property Boundary 53 55 NO R2 Midpoint of Northern Extension Property Boundary 51 60 NO R3 Midpoint of Eastern Extension Property Boundary 51 55 NO R4 Property Boundary North of Pickleball Courts 60 65 NO R5 Property Boundary East of Pickleball Courts 57 65 NO R6 Midpoint of Eastern Project Property Boundary 54 55 NO R7 Midpoint of Southern Project Property Boundary 50 55 NO ST2 Ambient Noise Measure Location at Via Vera Cruz 42 55 NO ST3 Ambient Noise Measurement Location at Church 45 55 NO Source: Appendix D
Notes: 1 The nighttime limit under the noise ordinance for City of San Marcos. dBA = A-weighted decibel; Leq = Noise Equivalent Level (Average Noise Level)

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FIGURE 4
San Marcos Restaurant Row
0 53 106 Feet
Noise Contours - Aggregate Stationary Sources Operational Noise Level Prediction ColorHighLow75707065656060555550504545404035353030252520Predicted Aggregate Sound Pressure Level Dba range R1
R2
R3
R4
R5
R6
R7
ST2
ST3

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Dudek also compared the predicted operational noise to ambient noise levels documented during the ambient noise survey, as reported for locations ST1, ST2, ST3 and ST4. Table 12 presents the predicted Project operational noise levels to the measured ambient noise levels; predicted Project operational noise levels at each ambient noise measurement point would fall below the measured ambient noise level. Adding the Project operational noise to the ambient noise level would in each case result in less than a 3 dB increase.

Table 12. Stationary Noise Source Modeling Results Compared to Ambient Road
Segment
ID
Description Predicted
Noise Level
(dBA Leq)
Ambient
Noise Level
(dBA Leq)
Ambient Plus
Project Noise
Level (dBA Leq)
Increase
Greater Than
3 dBA?
ST1 Pre-School on San Marcos,
East of Project 31 74 74 NO
ST2 Commercial uses on Via Vera
Cruz, East of Project 42 63 63 NO
ST3 Church, North of Project 45 46 48 NO
ST4 Commercial uses on Las
Posas, West of Project 32 65 65 NO
Source: Appendix D

On the basis of comparing predicted Project operational noise levels against both noise ordinance limits and ambient noise levels, a less-than-significant impact would occur for proposed project operational noise Cumulative Noise Assessment
Transportation Sources
The proposed proje ct would result in a reduction in the total number of traffic trips added to the local roadway network, when compared to the existing restaurant uses which would be eliminated by the project.

Therefore, the project would not have a considerable contribution to cumulative traffic impacts in the region.

Construction Activities
Temporary changes to the outdoor sound environment could also occur not only due to project construction noise that has already been presented herein, but as a cumulative result of potential concurrent project construction activity noise and the noise emission from construction of other projects in the vicinity.

Due to the decrease in noise levels with distance and the presence of physical barriers (i.e., intervening buildings and topography), noise due to construction of other projects would not meaningfully combine with that of the proposed project and produce a cumulative noise effect during construction. By way of illustration, if there are two concurrent construction projects of comparable sound emission intensity, and the activity nearest to a common studied noise-sensitive receptor is compliant with the aforementioned 75 dBA 8-hour Leq, then the other activity could be no closer than three times the distance of the receptor to the nearest activity and not make a cumulatively measurable contribution to the total noise exposure level.

If, on the other hand, two concurrent projects were comparably close to a receptor, the cumulative noise would be one of the following:

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• The louder (in dBA) of the two concurrent activities; or • a logarithmic sum of the two activity noise levels that, per acoustic principles, cannot be more than 3 dBA greater than the louder of the two individual noise-producing activities.

In sum, cumulativ e construction noise is likely to be dominated by the closest or loudest activity to the receptor, and the combination will be no more than a barely perceptible difference (i.e., up to a 3 dBA change). On the basis of such a barely perceptible cumulative construction noise level occurring due to the proposed project and what may be a nearby concurrent construction activity, the impact would be considered less than significant.

Stationary Operational Sources
Akin to the preceding discussion of cumulative con struction noise, operation noise from stationary equipment attributed to the proposed project (as already presented herein) and any others potentially operating in the future and in the vicinity of a common offsite noise -sensitive receptor would need to be compliant with the City’s applicable standards. Cumulative contribution of the proposed project to this future aggregate noise level from multiple established projects or facilities assumed to have comparable individual noise emission from stationary sour ces would be bounded by the same potential outcomes as follows:
• The louder (in dBA) of the two concurrently operating projects or facilities; or • a logarithmic sum of the two operation noise levels that, per acoustic principles, cannot be more than 3 dBA greater than the louder of the two individual levels.

In sum, cumulative operation noise is likely to be dominated by the closest or loudest project to the receptor, and the combination will be no more than a barely perceptible difference (i.e., up to a 3 dB A change). On the basis of such a barely perceptible cumulative operation noise level occurring due to the proposed project and what may be nearby and concurrent operation of offsite stationary noise sources, the impact would be considered less than significant.
b) Would the project result in generation of excessive groundborne vibration or groundborne noise levels? Conventional Construction Activity Vibration
Construction activities may expose persons to excessive groundborne vibration or groundborne noise , causing a potentially significant impact. Caltrans has collected groundborne vibration information related to construction activities (Caltrans 2020). Information from Caltrans indicates that continuous vibrations with a PPV of approximately 0.1 inch per second (ips) could be considered annoying on the basis of it being “strongly perceptible” by building occupants. For context, heavier pieces of construction equipment, such as a bulldozer that may be expected on the project site, have peak particle veloci ties of approximately

0.089 ips PPV or less at a reference distance of 25 feet (FTA 2018).

Groundborne vibration attenuates rapidly, even over short distances. The attenuation of groundborne vibration as it propagates from source to receptor through inter vening soils and rock strata can be estimated with expressions found in FTA and Caltrans guidance. By way of example, for a bulldozer operating on site and as close as the northern project boundary (i.e., 50 feet from the nearest occupied

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property) the est imated vibration velocity level would be 0.0 3 ips PPV per the equation as follows (FTA 2018):

PPVrcvr = PPVref * (25/D)^1.5 = 0.089 * (25/50)^1.5 = 0.006 In the above equation, PPV rcvr is the predicted vibration velocity at the receiver position, PPV ref is the reference value at 25 feet from the vibration source (the bulldozer), and D is the actual horizontal distance to the receiver. Therefore, at this predicted PPV, the impact of vibration -induced annoyance to occupants of nearby existing homes would be less than 0.1 ips PPV and therefore less than significant.

Construction vibration, at sufficiently high levels, can also present a building damage risk. However, anticipated construction vibration associated with future development on-site would yield level s of 0.0 3 ips, which do not surpass the guidance limit of 0.2 to 0.3 ips PPV for preventing damage to residential structures (Caltrans 2020). Because the predicted vibration level at 50 feet is less than this guidance limit, the risk of vibration damage to nearby structures is considered less than significant. 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? There are no private airstrips within the vicinity of the project site. The closest airport to the project site is the McClellan Palomar Airport approximately 4.6 miles west of the site; the project site is not located within the boundaries of the land use plan adopted for this airport. . Impacts from aviation overflight noise exposure would be considered less than significant .

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6 Mitigation Measures
Short-term construction noise levels at the closest receivers, o n-site operational noise levels, off-site traffic noise contributions, and construction vibration levels were each determined to be less than significant, and therefore no mitigation measures would be required for these impacts.

Traffic noise exposure for a proposed noise-sensitive use, such as a residence, is no longer addressed under CEQA.

With respect to Project compliance with Noise Element policies regarding exterior noise exposure levels for multi- family residences, the following site design element is recommended:
• For residences with yard area that lies adjacent to the southern, eastern, or norther Project Site boundary, a six-foot-high solid fence or landscape wall should be provided along the yard/project site boundary in order to ensure exterior noise levels from roadway traffic and adjacent commercial uses does not exceed 65 dBA CNEL in these yard areas.

.

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7 Summary of Findings
This noise report was conducted for potential future development associated with the approval of the proposed project. The results indicate short-term construction noise levels at the closest receivers, on-site operational noise levels, off-site traffic noise contributions, and construction vibration levels were each determined to be less than significant. No mitigations would therefore be required for noise or vibration effects of the proposed project.

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8 References Cited
Caltrans (California Department of Transportation). 2013. Technical Noise Supplement to the Traffic Noise Analysis Protocol. September.

Caltrans. 2020. Transportation and Construction Vibration Guidance Manual. Division of Environmental Analysis, Environmental Engineering, Hazardous Waste, Air, Noise, Paleontology Office. Sacramento, California. April.

California Department of Government Services (DGS). 2022. 2022 California Building Standards Code (Cal. Code Regs., Title 24). July 1, 2022.

Carrier. 2012. CA16NA 018-061 Single-Stage Air Conditioner w/ Puron Refrigerant. Catalog No: CA16NA-06PD. https://resource.carrierenterprise.com/is/content/Watscocom/carrier_ca16na03600g_article_1404816 230548_en_ss?_ga=2.123164302.489492439.1570570581-792571132.1570570581 DOT (U.S. Department of Transportation). 2006. FHWA Roadway Construction Noise Model: User’s Guide. Final Report. FHWA-HEP-06-015. DOT-VNTSC-FHWA-06-02. Cambridge, Massachusetts: DOT, Research and Innovative Technology Administration. Final Report. August.

Dudek 2020a. Pickleball Courts Sound Level Evaluation, Burnum Wood Golf Club, Montecito, Califonia. July 2020.

Dudek 2020b. Environmental Noise and Vibration Assessment for the Santa Cruz Medical Office Building Project, Santa Cruz County, California. December 2020.

Federal Highway Administration (FHWA). 2004. Traffic Noise Model (version 2.5).

FHWA. December 8, 2008. Roadway Construction Noise Model (RCNM), Software Version 1.1. U.S. Department of Transportation, Research and Innovative Technology Administration, John A. Volpe National Transportation Systems Center, Environmental Measurement and Modeling Division. Washington, D.C.

FTA (Federal Transit Administration). 2018. Transit Noise and Vibration Impact Assessment. FTA Report No. 0123. September.

OPR (Governor’s Office of Planning and Research). 2003. State of California General Plan Guidelines. October.

San Marcos, City of. 2017. City of San Marcos Municipal Code.

San Marcos, City of. 2012. City of San Marcos General Plan. Chapter 7.0, Noise Element. February 2012.

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Appendix A
Baseline Noise Measurement Field Data

Field Noise Measurement Data
Record: 1426
Project Name Restaurant row
Observer(s) Connor Burke
Date 2022-06-24

Meteorological Conditions
Temp (F) 82
Humidity % (R.H.) 39
Wind Light
Wind Speed (MPH) 5
Wind Direction West
Sky Sunny

Instrument and Calibrator Information
Instrument Name List (ENC) Rion NL-52
Instrument Name (ENC) Rion NL-52
Instrument Name Lookup Key (ENC) Rion NL-52
Manufacturer Rion
Model NL-52
Serial Number 553896
Calibrator Name (ENC) LD CAL150
Calibrator Name (ENC) LD CAL150
Calibrator Name Lookup Key (ENC) LD CAL150
Calibrator Manufacturer Larson Davis
Calibrator Model LD CAL150
Calibrator Serial # 5152
Pre-Test (dBA SPL) 94
Post-Test (dBA SPL) 94
Windscreen Yes
Weighting? A-WTD
Slow/Fast? Slow
ANSI? Yes

Monitoring
Record # 1
Site ID ST1
Site Location Lat/Long 33.135145, -117.185674
Begin (Time) 09:40:00
End (Time) 09:55:00
Leq 74
Lmax 83
Lmin 53.8
Other Lx? L90, L50, L10
L90 60.6
L50 72
L10 77.4
Other Lx (Specify Metric) L
Primary Noise Source Traffic
Other Noise Sources (Background) Distant Dog Barking, Distant Traffic Is the same instrument and calibrator being used
as previously noted?
Yes
Are the meteorological conditions the same as
previously noted?
Yes