Iv. Environmental Impact Analysis I. Noise

IV. ENVIRONMENTAL IMPACT ANALYSIS I. NOISE

1. INTRODUCTION This section analyzes potential noise and vibration impacts associated with construction and operation of the proposed project. The analysis describes the existing noise environment within the vicinity of the project site, estimates future noise levels at surrounding land uses resulting from construction and operation of the proposed project, identifies the potential for significant impacts, and provides mitigation measures to address significant impacts. In addition, an evaluation of the potential cumulative noise impacts from the proposed project and known related projects is also provided. Noise calculation worksheets are included in Appendix G of this Draft EIR.

2. ENVIRONMENTAL SETTING a. Noise and Vibration Basics (1) Noise Noise is most often defined as unwanted sound. Although sound can be easily measured, the perceptibility of sound is subjective and the physical response to sound complicates the analysis of its impact on people. People judge the relative magnitude of sound sensation in subjective terms such as “noisiness” or “loudness.” Sound pressure magnitude is measured and quantified using a logarithmic ratio of pressures, the scale of which gives the level of sound in decibels (dB). The human hearing system is not equally sensitive to sound at all frequencies. Therefore, to approximate this human, frequency‐dependent response, the A‐weighted filter system is used to adjust measured sound levels. The A‐weighted sound level is expressed in “dBA.” This scale de‐emphasizes low frequencies to which human hearing is less sensitive and focuses on mid‐ to high‐range frequencies.

Although the A‐weighted scale accounts for the range of people’s response, and therefore, is commonly used to quantify individual event or general community sound levels, the degree of annoyance or other response effects also depends on several other perceptibility factors. These factors include:

. Ambient (background) sound level; . Magnitude of sound event with respect to the background noise level; . Duration of the sound event; . Number of event occurrences and their repetitiveness; and . Time of day that the event occurs.

City of Los Angeles 10000 Santa Monica Boulevard PCR Services Corporation/SCH No. 2011041042 IV.I‐1

IV.I. Noise September 2011

People judge the relative magnitude of sound sensation by subjective terms such as “loudness” or “noisiness.” That is, a change in sound level of 3 dB is considered “just perceptible,” a change in sound level of 5 dB is considered “clearly noticeable, and a change in 10 dB is recognized as “twice as loud”.1

In an outdoor environment, sound levels attenuate through the air as a function of distance. Such attenuation is called “distance loss” or “geometric spreading” and is based on the source configuration, point source, or line source. For a point source, the rate of sound attenuation is 6 dB per doubling of distance from the noise source. For example, a sound level of 50 dBA at a distance of 25 feet from the noise source would attenuate to 44 dBA at a distance of 50 feet. For a line source, such as a constant flow of traffic on a roadway, the rate of sound attenuation is 3 dB per doubling of distance.2 In addition, structures (e.g., buildings and solid walls) and natural topography (e.g., hills) that obstruct the line‐of‐sight between a noise source and a receptor further reduce the noise level if the receptor is located within the “shadow” of the obstruction, such as behind a sound wall. This type of sound attenuation is known as “barrier insertion loss.” If a receptor is located behind the wall but still has a view of the source (i.e., line‐of‐sight not fully blocked), some barrier insertion loss would still occur, however to a lesser extent. Additionally, a receptor located on the same side of the wall as a noise source may actually experience an increase in the perceived noise level as the wall reflects noise back to the receptor, thereby compounding the noise. Noise barriers can provide noise level reductions ranging from approximately 5 dBA (where the barrier just breaks the line‐of‐sight between the source and receiver) to an upper range of 20 dBA with a more substantial barrier.3

Community noise levels usually change continuously during the day. The equivalent sound level (Leq) is normally used to describe community noise. The Leq is the equivalent steady‐state A‐weighted sound level that would contain the same acoustical energy as the time‐varying A‐weighted sound level during the same time interval. For intermittent noise sources, the maximum noise level (Lmax) is normally used to represent the maximum noise level measured during the measurement. Maximum and minimum noise levels, as compared to the Leq, are a function of the characteristics of the noise source. As an example, sources such as generators have maximum and minimum noise levels that are similar to Leq since noise levels for steady‐ state noise sources do not substantially fluctuate. However, as another example, vehicular noise levels along local roadways result in substantially different minimum and maximum noise levels when compared to the

Leq since noise levels fluctuate during pass‐by events. The City of Los Angeles Noise Ordinance uses the Leq to evaluate noise violations.

To assess noise levels over a given 24‐hour time period, the community noise equivalent level (CNEL) descriptor is used in land use planning. CNEL is the time average of all A‐weighted sound levels for a 24‐ hour period with a 5 dBA adjustment (upward) added to the sound levels which occur in the evening (7:00 P.M. to 10:00 P.M.) and a 10 dBA adjustment (upward) added to the sound levels which occur in the night (10:00 P.M. to 7:00 A.M.). These penalties attempt to account for increased human sensitivity to noise during the quieter nighttime periods, particularly where sleep is the most probable activity. CNEL has been adopted by the State of California to define the community noise environment for development of a community noise

1 Engineering Noise Control, Bies & Hansen, 1988. 2 Caltrans, Technical Noise Supplement (TeNS), 1998. 3 Ibid.

City of Los Angeles 10000 Santa Monica Boulevard PCR Services Corporation/SCH No. 2011041042 IV.I‐2

September 2011 IV.I. Noise element of a General Plan and is also used by City of Los Angeles for land use planning in the City’s Noise Element of the General Plan.4

(2) Ground‐Borne Vibration Vibration is an oscillatory motion through a solid medium in which the motion’s amplitude can be described in terms of displacement, velocity, or acceleration. With respect to ground‐borne vibration, velocity and acceleration descriptors are typically used, as most vibration sensors are velocity or acceleration sensor. In addition, the response of humans, buildings, and equipment to vibration is more accurately described using velocity or acceleration.5 Vibration amplitudes are usually described as either peak, as in peak particle velocity (PPV) or root‐mean‐square (RMS). The RMS vibration velocity level can be presented in inches/second or in VdB (referenced to 1 micro‐inches per second). The peak level represents the maximum instantaneous peak of the vibration signal and the RMS represents the average of the squared amplitude of the vibration signal. In addition, vibrations can be measured in the vertical, horizontal longitudinal, or horizontal transverse directions. Ground vibrations are most often greatest in the vertical direction.6 Therefore, the analysis of ground‐borne vibration is addressed in the vertical direction. b. Existing Conditions (1) Noise‐Sensitive Receptor Locations Some land uses are considered more sensitive to intrusive noise than others due to the amount of noise exposure and the types of activities typically involved at the receptor location. The City of L.A. CEQA Thresholds Guide (2006) states that residences, schools, motels and hotels, libraries, religious institutions, hospitals, nursing homes, and parks are generally more sensitive to noise than commercial and industrial land uses. Noise sensitive receptors were selected based on the relative distance from the receptors to the project site, in accordance with the City of L.A. CEQA Thresholds Guide screening criteria. Existing noise sensitive uses in the project vicinity are shown in Figure IV.I‐1, Noise Sensitive Uses and Noise and Vibration Measurement Locations, and include the following:

. Multi‐ Family Residential Areas: Located to the east side of the project site along Moreno Drive and Durant Drive. The nearest multi‐family residential properties are located approximately 60 feet from the project site. These residential uses are located within the City of Beverly Hills. . School Uses: Beverly Hills High School (BHHS) and in particular the Science and Technology Center building is located south of the project site on Moreno Drive approximately 25 feet from the nearest property line of the project site, but approximately 170 feet from the project’s residential building and approximately 60 feet from the ancillary building.

(2) Ambient Noise Levels The predominant noise source surrounding the project site is roadway noise from the Santa Monica Boulevard to the north and Moreno Drive to the east. Secondary noise sources including commercial/retail‐

4 State of California, General Plan Guidelines, 2002. 5 Federal Transit Authority, Transit Noise and Vibration Impact Assessment, Final Report, page 7‐3, April 1995. 6 California Department of Transportation (Caltrans), Transportation Related Earthborne Vibrations, page 4, February 2002.

City of Los Angeles 10000 Santa Monica Boulevard PCR Services Corporation/SCH No. 2011041042 IV.I‐3

IV.I. Noise September 2011 related activities along Santa Monica Boulevard, such as loading dock/delivery truck activities, trash compaction, parking garage, and refuse services activities.

Measured Noise Levels – Existing Conditions Ambient noise measurements were taken at four locations to asses existing noise levels at the project site and nearby land uses in the vicinity of the project site.7 The four noise measurement locations are identified as R1, R2, R3, and R4 as shown in Figure IV.I‐1. As shown in Table IV.I‐1, Summary of Ambient Noise Measurements, short‐term (15‐minute) measurements were conducted at locations R1 and R4 on Thursday, May 12, 2011 between the hours of 11:00 A.M. and 1:00 P.M. Long‐term (24‐hour) measurements were conducted at locations R2 and R3 from Friday, May 13, 2011 through Sunday, May 15, 2011. The four noise measurement locations are further described below:

Table IV.I‐1

Summary of Ambient Noise Measurements

a Distance to Measured Ambient Noise Levels (dBA) Nearest Daytime Nighttime 24‐Hour Proposed (7 A.M. to 10 P.M.) (10 P.M. to 7 A.M.) Average Measurement Location, Day, and Time Building Hourly Leq Hourly Leq CNEL R1 – North project boundary Thursday, 5/12/11(11 A.M. to 1 Project Site P.M.) 66.8 ‐ N/Ab R2 – East project boundary/Multi‐family residential uses Friday, 5/13/11 (full 24 hours) 60 feet 56.2 – 76.8 50.7 – 59.4 69.2 Saturday, 5/14/11 (full 24 hours) 52.7 – 74.8 47.7 – 55.4 67.0 Sunday, 5/15/11 (full 24 hours) 52.6 – 61.7 47.7 – 54.4 60.7 R3 – South project boundary/School uses Friday, 5/13/11 (full 24 hours) 52.3 – 67.3 47.9 – 53.8 61.8 25 feet Saturday, 5/14/11 (full 24 hours) 50.2 – 64.9 45.3 – 51.5 60.2 Sunday, 5/15/11 (full 24 hours) 48.1 – 54.4 45.2 – 51.0 56.5 R4 – Multi‐family residential uses along Durant Drive 300 feet Thursday, 5/12/11 (11 A.M. to 1 P.M.) 55.4 ‐ N/Ab

a Detailed measured noise data, including hourly Leq levels, are included in Appendix G. b The CNEL measurements are based on 24‐hour measurements. Therefore, CNEL values are not estimated for locations R1 and R4, which were measured from 11:00 A.M. to 1:00 P.M.

Source: PCR Services Corporation, 2011.

7 The ambient noise measurements were conducted using the Larson‐Davis 820 Precision Integrated Sound Level Meter (SLM). The Larson‐Davis 820 SLM is a Type 1 standard instrument as defined in the American National Standard Institute (ANSI) S1.4. All instruments were calibrated and operated according to the applicable manufacturer specification.

City of Los Angeles 10000 Santa Monica Boulevard PCR Services Corporation/SCH No. 2011041042 IV.I‐4

LEGEND

Project Site

Noise Sensitive Receptor Locations

Merv Griffin WWay Noise Measurement Locations

Vibration Measurement Locations ay

a Monica Blvd SantSanta Monica Blvd a Monica Blvd

S SantaSant Monica Blvd Durant Dr V3 R1 R2 R4 V2 Robbins Dr V1 S Moreno Dr R3

Century Park E

N Noise Sensitive Uses and Noise and FIGURE 0 400 Feet Vibration Measurement Locations 10000 Santa Monica Boulevard IV.I-1 Source: PCR Services Corporation, 2008; Google Earth, 2008. PCR IV.I. Noise September 2011

This page is intentionally blank.

City of Los Angeles 10000 Santa Monica Boulevard PCR Services Corporation/SCH No. 2011041042 IV.I‐6

September 2011 IV.I. Noise

. Noise Measurement Location R1: This measurement location represents the project site. The sound measuring device (sound level meter) was placed within the project boundaries near Santa Monica Boulevard. . Noise Measurement Location R2: This measurement location represents the existing sound environment at the project site and the nearby multi‐family residential units east of the project site. The sound level meter was placed on the east boundary of the project site near Moreno Drive. . Noise Measurement Location R3: This measurement location represents the project site and BHHS located immediately south of the project site. The sound level meter was placed on the south boundary of the project site. . Noise Measurement Location R4: This measurement location represents the multi‐family residential uses along Durant Drive. The sound level meter was placed on Durant Drive approximately 200 feet from the northeast corner of Durant Drive and Moreno Drive. As also shown in Table IV.I‐1, the measured CNEL at the project site ranged from 56.5 CNEL at the southern project boundary to 69.2 CNEL at the eastern project boundary. The City of Los Angeles uses state land use noise compatibility guidelines for evaluating whether the CNEL level in a particular neighborhood is acceptable for a particular use.8 The noise compatibility guidelines are shown in Table IV.I‐2, City of Los Angeles Land Use Compatibility for Community Noise. CNEL guidelines for specific land uses are classified into four categories: (1) “normally acceptable,” (2) “conditionally acceptable,” (3) “normally unacceptable,” and (4) “clearly unacceptable.” As indicated, the noise environment in the project area (i.e. 56.5 CNEL to 69.2 CNEL) is considered “normally acceptable” to “conditionally acceptable” for multi‐family residential uses.

Modeled Noise Conditions – Traffic Noise To further characterize the area’s noise environment, the CNEL noise levels generated by existing traffic on local roadways was calculated using a noise prediction model based on calculation methodologies provided in the California Department of Transportation (Caltrans) Technical Noise Supplement (TeNS) document and traffic data included in the Traffic Study for the proposed project.9

A model calibration test (i.e. actual sampled data) was performed at Santa Monica Boulevard, west of Moreno Drive (R1), for comparison to the noise level predicted by the noise prediction mode. A minimum of 15‐minute noise recording was made concurrent with logging of actual traffic volumes and auto fleet mix (i.e., standard automobile, medium duty truck, or heavy duty truck). The traffic counts were entered into the noise model along with the observed speed, lane configuration, and distance to the roadway to calculate the traffic noise levels. The results of the traffic noise model calibration are provided in Table IV.I‐3, Traffic Noise Model Calibration Results. As indicated, the noise model results are within less than 1 dBA of the measured noise levels, which is within the industry standard tolerance of the noise prediction model. Therefore, the project specific traffic noise prediction model is considered accurate and specific to project conditions.

8 City of Los Angeles CEQA Thresholds Guide, 2006, page I.2‐4. 9 The roadway noise calculation procedures provided in the Caltrans TeNS are consistent with Federal Highway Administration RD‐ 77‐108 roadway noise prediction methodologies. This methodology allows for the definition of roadway configurations, barrier information (if any), and receiver locations.

City of Los Angeles 10000 Santa Monica Boulevard PCR Services Corporation/SCH No. 2011041042 IV.I‐7

IV.I. Noise September 2011

Table IV.I‐2

City of Los Angeles Land Use Compatibility for Community Noise

Community Noise Exposure CNEL, dBA Normally Conditionally Normally Clearly Land Use Acceptable a Acceptable b Unacceptable c Unacceptable d Single‐Family, Duplex, Mobile 50 to 60 55 to 70 70 to 75 Above 70e Homes Multi‐Family Homes 50 to 65 60 to 70 70 to 75 Above 70e Schools, Libraries, Churches, 50 to 70 60 to 70 70 to 80 Above 80 Hospitals, Nursing Homes Transient Lodging—Motels, Hotels 50 to 65 60 to 70 70 to 80 Above 80 Auditoriums, Concert Halls, — 50 to 70 — Above 65 Amphitheaters Sports Arena, Outdoor Spectator — 50 to 75 — Above 70 Sports Playgrounds, Neighborhood Parks 50 to 70 — 67 to 75 Above 72 Golf Courses, Riding Stables, Water 50 to 75 — 70 to 80 Above 80 Recreation, Cemeteries Office Buildings, Business and 50 to 70 67 to 77 Above 75 — Professional Commercial Industrial, Manufacturing, Utilities, 50 to 75 70 to 80 Above 75 — Agriculture

a Normally Acceptable: Specified land use is satisfactory, based upon the assumption that any buildings involved are of normal conventional construction without any special noise insulation requirements. b Conditionally Acceptable: New construction or development should be undertaken only after a detailed analysis of the noise reduction requirements is made and needed noise insulation features included in the design. Conventional construction, but with closed windows and fresh air supply systems or air conditioning will normally suffice. c Normally Unacceptable: New construction or development should generally be discouraged. If new construction or development does proceed, a detailed analysis of the noise reduction requirements must be made and needed noise insulation features included in the design. d Clearly Unacceptable: New construction or development should generally not be undertaken. e This 70 dB figure is quoted directly from the City of L.A. CEQA Thresholds Guide. However, other sources quote this number as 75 dB (i.e., State of California General Plan Guidelines, Preliminary Draft, Governor’s Office of Planning and Research, October 2002, p. 258, and Noise Element of the City of Los Angeles General Plan, Department of City Planning Los Angeles, California, February 1999, p. I‐1). This may be a typographical error in the City of L.A. CEQA Thresholds Guide (2006). Note that this potential error does not affect the determination of significant impacts for this report.

Source: City of L.A. CEQA Thresholds Guide, 2006.

The traffic noise prediction model calculates the 24‐hour CNEL noise levels based on specific information including, average daily traffic volume (ADT), percentages of day, evening and nighttime traffic volumes relative to ADT, vehicle speed, and distance between the noise receptor and the roadway. Vehicle mix/distribution information used in the noise calculation is shown in Table IV.I‐4, Vehicle Mix for Traffic Noise Model. As indicated in Table IV.I‐5, Predicted Existing Vehicular Traffic Noise Levels, the calculated CNEL for the analyzed roadway segments as a result of existing traffic volumes ranged from 58.1 dBA CNEL to 72.7 dBA CNEL at a distance of 25 feet based on surface‐street traffic volumes only. As shown therein,

City of Los Angeles 10000 Santa Monica Boulevard PCR Services Corporation/SCH No. 2011041042 IV.I‐8

September 2011 IV.I. Noise

Table IV.I‐3

Traffic Noise Model Calibration Results

Traffic Counts During Project Difference Noise Readings Traffic Noise between 15‐minutes (A.M./P.M.) Measured Model Predicted and Traffic Noise Predicted Measured Road Segment/Noise Medium Heavy Levels Noise Levels Levels a b Measurement Location Autos Trucks Trucks Leq (dBA) Leq (dBA) dBA Santa Monica Blvd./ 564 16 5 66.9 67.5 0.6 R1 (P.M.)

a Medium Truck – 2 axle trucks based on field observations. b Heavy Truck – 3 or more axles trucks and buses based on field observations.

Source: PCR Services Corporation, 2011.

Table IV.I‐4

Vehicle Mix for Traffic Noise Model

Percent of ADT Daytime hours Evening Hours Nighttime Hours Vehicle Type (7 A.M. to 7 P.M.) (7 P.M. to 10 P.M.) (10 P.M. to 7 A.M.) Total Automobile 78.4 9.8 9.8 98.0 Medium Trucka 0.8 0.1 0.1 1.0 Heavy Truckb 0.8 0.1 0.1 1.0

a Medium Truck – 2 axle trucks based on field observations. b Heavy Truck – 3 or more axles trucks and buses based on field observations.

Source: PCR Services Corporation, 2008. traffic related noise levels at the nearest sensitive receptors to each analyzed roadway segment exceed normally acceptable noise levels at the majority of the studied residential areas (i.e., 65 dBA CNEL or lower), except at residential uses along Roxbury Drive, Bedford Drive, Prosser Avenue, Spalding Drive, Moreno Drive, Durant Drive, Veteran Drive, Olympic Boulevard between Century East and Spalding Drive, Olympic Boulevard east of Spalding Drive, and Century Park West between Santa Monica Boulevard and Constellation Avenue.

(3) Vibration‐Sensitive Receptor Locations The analysis of vibration below is based on the vibration effects that could occur at the nearest sensitive receptors to the project site. These include the nearest residential unit located across Moreno Drive from the project site, and the Beverly Hills High School Science and Technology Center (Science and Technology Center) located across a driveway abutting the southern edge of the project site. The analysis also addresses

City of Los Angeles 10000 Santa Monica Boulevard PCR Services Corporation/SCH No. 2011041042 IV.I‐9

IV.I. Noise September 2011

Table IV.I‐5

Predicted Existing Vehicular Traffic Noise Levels

Existing CNEL (dBA) at Referenced Adjacent Distances from Roadway Right‐of‐Way Roadway Segment Land Use Adjacent 25 Feet 50 Feet Santa Monica Boulevard West of Century Park West Residential 72.4 70.4 69.0 Between Century Park West & Century Park Residential 71.8 70.0 68.7 East Between Century Park East & Moreno Dr. Residential 72.2 70.2 68.8 Between Moreno Dr. & Wilshire Blvd. Residential 71.2 69.2 67.8 Between Wilshire Blvd. & Beverly Dr. Residential 73.4 70.1 68.3 East of Beverly Dr. Residential 72.8 69.9 68.1 South Santa Monica Boulevard Between Century Park East & Moreno Dr. Residential 76.4 72.3 70.3 Wilshire Boulevard Northwest of Santa Monica Blvd. Residential 73.8 71.0 69.3 Olympic Boulevard Between Overland Ave. & Prosser Ave. Residential 67.1 65.0 63.5 Between Prosser Ave. & Beverly Glen Blvd. Residential 70.2 68.1 66.6 Between Beverly Glen Blvd. & Century Park Residential 73.3 71.2 69.7 West Between Century Park West and Century Park Residential 68.8 66.7 65.3 East Between Century Park East & Spalding Dr. Residential 62.2 60.1 58.6 East of Spalding Dr. Residential 64.0 61.8 60.4 Roxbury Drive North of Santa Monica Blvd. Residential 63.4 60.4 58.7 North of Olympic Blvd. Residential 62.4 59.4 57.7 South of Olympic Blvd. Residential 62.7 59.8 58.0 Roxbury Drive/Brighton Way South of Wilshire Blvd. Residential 62.8 59.8 58.0 Bedford Drive North of Santa Monica Blvd. Residential 63.3 60.3 58.6 Prosser Avenue North of Olympic Blvd. Residential 61.4 58.4 56.7 South of Olympic Blvd. Residential 61.3 58.3 56.6 Beverly Glen Boulevard North of Santa Monica Blvd. Residential 71.6 69.2 67.6 Between Santa Monica Blvd. & Olympic Blvd. Residential 69.6 67.2 65.6 South of Olympic Blvd. Residential 68.0 65.6 64.0 Veteran Drive North of Santa Monica Blvd. Residential 67.4 64.4 62.7 South of Santa Monica Blvd. Residential 66.4 63.4 61.6 Overland Avenue Between Santa Monica Blvd. & Olympic Blvd. Residential 68.7 66.3 64.7 South of Olympic Blvd. Residential 70.6 68.2 66.6

City of Los Angeles 10000 Santa Monica Boulevard PCR Services Corporation/SCH No. 2011041042 IV.I‐10

September 2011 IV.I. Noise

Existing CNEL (dBA) at Referenced Adjacent Distances from Roadway Right‐of‐Way Roadway Segment Land Use Adjacent 25 Feet 50 Feet Century Park West Between Santa Monica Blvd. & Constellation Residential 67.9 64.7 62.8 Ave. Between Constellation Ave. & Olympic Blvd. Residential 69.0 65.7 63.9 Century Park East Between Olympic Blvd. & Pico Blvd. Residential 69.3 66.5 64.8 Spalding Drive North of Olympic Blvd. Residential 66.2 63.2 61.5 South of Olympic Blvd. Residential 61.0 58.1 56.3 North of Moreno Dr. Residential 65.6 62.7 60.9 Avenue of the Stars Between Santa Monica Blvd. & Constellation Residential 72.1 69.3 67.6 Ave. Between Constellation Ave. & Olympic Blvd. Residential 72.7 69.9 68.2 Moreno Drive Between Santa Monica Blvd. & Durant Dr. Residential 66.0 61.9 59.9 South of Durant Dr. Residential 67.2 63.1 61.0 Durant Drive East of Moreno Dr. Residential 64.2 61.2 59.5 Pico Boulevard West of Beverly Glen Blvd. Residential 74.9 72.7 71.3 Between Beverly Glen Blvd. and Motor Ave. Residential 74.8 72.7 71.2

Source: PCR Services Corporation, 2011.

potential vibration impacts at a residential location on Durant Drive, within the residential neighborhood further east to indicate the extent of more distant vibration effects.

(4) Ground‐Borne Vibration Environment The existing ground vibration environment surrounding the project site is comprised primarily of auto traffic on nearby streets. A vibration survey was conducted at the project’s southern boundary near the Science and Technology Center (Vibration Measurement Location V1) and at two residential receptors including multi‐family residential uses across Moreno Drive (Vibration Measurement Location V2) and multi‐family residential uses along Durant Drive (Vibration Measurement Location V3) as shown in Figure IV.I‐1, above. In general, the current ground vibration environment in the vicinity of the project site is below the “barely perceptible” level of 0.01 inch per second PPV. However, vibration sampling at the project site identified a couple of short events (less than a few seconds) in which the measured ground vibration reached a peak level of 0.0135 inch per second PPV at location V2 and 0.0365 inch per second PPV at location V1

City of Los Angeles 10000 Santa Monica Boulevard PCR Services Corporation/SCH No. 2011041042 IV.I‐11

IV.I. Noise September 2011 which is within the “distinctly perceptible” level. Measured ground vibration levels of 0.0365 inch per second PPV were also identified at location V1.10 c. Regulatory Framework Many government agencies have established noise standards and guidelines to protect citizens from potential hearing damage and various other adverse physiological and social effects associated with noise. The project site is located within the Century City Community of the City of Los Angeles. Therefore, applicable policies and regulations from the City of Los Angeles are used to assess potential noise impacts from the proposed project.

(1) City of Los Angeles General Plan Noise Element The overall purpose of the Noise Element of a General Plan is to protect citizens from the harmful and annoying effects of exposure to excessive noise. City of Los Angeles Noise Element policies that relate to the proposed project include the following:11

. Policy 2.2—Enforce and/or implement applicable city, state, and federal regulations intended to mitigate proposed noise producing activities, reduce intrusive noise, and alleviate noise that is deemed a public nuisance. . Policy 3.1—Develop land use policies and programs that would reduce or eliminate potential and existing noise impacts.

(2) Los Angeles Municipal Code The City of Los Angeles Noise Regulation is provided in Chapter XI of the LAMC. Section 111.02 of the LAMC provides procedures and criteria for the measurement of the sound level of “offending” noise sources. In accordance with the LAMC, a noise level increase of 5 dBA over the existing average ambient noise level at an adjacent property line is considered a noise violation. To account for people’s increased tolerance for short‐ duration noise events, the Noise Regulation provides a 5 dBA allowance for noise source occurring more than five but less than fifteen minutes in any one‐hour period and an additional 5 dBA allowance (total of 10 dBA) for noise source occurring five minute or less in any one‐hour period.12

The LAMC indicates that in cases where the actual measured ambient conditions are not known or are less than 50 dBA, the presumed daytime (7:00 A.M. to 10:00 P.M.) and nighttime (10:00 P.M. to 7:00 A.M.) minimum ambient noise levels defined in Section 111.02 of the LAMC should be used. The presumed ambient noise

10 Detailed information regarding the vibration testing is included in Appendix G of this Draft EIR. Ground vibration recordings were performed in 2008 and are considered representative of the current site conditions; as ground conditions have not changed since 2008, and comparisons of noise sampling between 2008 and 2011 indicated that changes in traffic generated noise (and co‐ occurring vibration) are negligible. Any slight increase in traffic would render the use of the 2008 data a more conservative estimate as project additions to the vibration setting would represent a greater percentage increase. The monitoring included Long‐term (24‐ hour) vibration measurements at the project’s southern boundary (V1) and short‐term (15‐minute) vibration measurements at the two off‐site locations (V2 and V3). The portable seismic monitoring system Model SSU 3000LC manufactured by Geo Sonics was programmed to record ground movement in one minute intervals in the form of PPV, in units of inch per second. 11 Noise Element of the Los Angeles City General Plan, adopted February 3, 1999. 12 Los Angeles Municipal Code, Chapter XI, Article I, Section 111.02‐(b).

City of Los Angeles 10000 Santa Monica Boulevard PCR Services Corporation/SCH No. 2011041042 IV.I‐12

September 2011 IV.I. Noise levels for these areas as set forth in the LAMC Sections 111.02 and 112.05 are provided in Table IV.I‐6, City of Los Angeles Presumed Ambient Noise Levels. For residential‐zoned areas, the presumed ambient noise level is 50 dBA during the daytime and 40 dBA during the nighttime.

Table IV.I‐6

City of Los Angeles Presumed Ambient Noise Levels

Daytime Hours Nighttime Hours (7 A.M. to 10 P.M.) (10 P.M. to 7 A.M.) Zone dBA (Leq) dBA (Leq) Residential 50 40 Commercial 60 55 Manufacturing 65 65 Heavy Manufacturing 70 70

Source: Los Angeles Municipal Code, Section 111.03.

Section 112.05 of the LAMC sets a maximum noise level for construction equipment of 75 dBA at a distance of 50 feet when operated within 500 feet of a residential zone. Compliance with this standard is only required where “technically feasible.”13 Section 41.40 of the LAMC prohibits construction between the hours of 9:00 P.M. and 7:00 A.M. Monday through Friday, 6:00 P.M. and 8:00 A.M. on Saturday, and at any time on Sunday. In general, the City of Los Angeles Department of Building and Safety enforces noise ordinance provisions relative to equipment and the Los Angeles Police Department enforces provisions relative to noise generated by people.

(3) Guidelines for Noise Compatible Land Use The City of Los Angeles has adopted local guidelines based, in part, on the community noise compatibility guidelines established by the State Department of Health Services for use in assessing the compatibility of various land use types with a range of noise levels. These guidelines are set forth in the City of L.A. CEQA Thresholds Guide (2006) in terms of CNEL. CNEL guidelines for specific land uses are classified into four categories: (1) “normally acceptable,” (2) “conditionally acceptable,” (3) “normally unacceptable,” and (4) “clearly unacceptable.” As shown in Table IV.I‐2, on page 7 a CNEL value of 65 dBA is the upper limit of what is considered a “normally acceptable” noise environment for multi‐family residential uses, although a CNEL as high as 70 dBA is considered “conditionally acceptable.” The upper limit of what is considered “normally unacceptable” for residential uses is set at 75 dBA CNEL.14 New development should generally be discouraged within the “unacceptable” category. However, if new development does proceed, a detailed analysis of the noise reduction requirements must be made and needed noise insulation features included in the design.

13 In accordance with the City of Los Angeles Noise Ordinances, “technically feasible” means that the established noise limitations can be complied with at a project site, with the use of mufflers, shields, sound barriers, and/or other noise reduction devices or techniques employed during the operation of equipment. 14 City of L.A. CEQA Thresholds Guide, Section I.2, 2006.

City of Los Angeles 10000 Santa Monica Boulevard PCR Services Corporation/SCH No. 2011041042 IV.I‐13

IV.I. Noise September 2011

(4) Ground‐Borne Vibration (State and Federal Standards) The City of Los Angeles does not have specific policies or guidelines relative to ground‐borne vibration. As such, policies and guidelines from Caltrans and Federal Transit Administration (FTA) are utilized to assess impacts due to ground‐borne vibration. Ground‐borne vibration impacts are evaluated based on a) potential building damage, b) potential human annoyance, and c) potential effect on vibration sensitive equipment. The FTA and Caltrans have adopted guidelines/recommendations to limit ground‐borne vibration based on the age and/or condition of the structures that are located in close proximity to construction activity. Studies by the Caltrans and FTA show vibration velocity levels greater than 0.04 inch per second PPV are distinctly perceptible to human and become strongly perceptible when reaching 0.10 inch per second PPV as shown in Table IV.I‐7, Guideline Vibration Annoyance Potential Threshold Criteria.

Table IV.I‐7

Guideline Vibration Annoyance Potential Threshold Criteria

Maximum PPV (inch per second)/VdB Continuous/Frequent Human Response Transient Sources a Intermittent Sources b Barely perceptible 0.04/80 0.01/68 Distinctly perceptible 0.25/96 0.04/80 Strongly perceptible 0.90/104 0.10/88 Severe 2.00/114 0.40/100

a Transient sources created a single isolated vibration event, such as blasting or drop balls. b Continuous/frequent intermittent sources include impact pile drivers, pogo‐stick compactors, crack‐an‐ seat equipment, vibratory pile drivers, and vibratory compaction equipment.

Source: Caltrans, Transportation‐ and Construction‐Induced Vibration Guidance Manual, Table 20, 2004.

The building damage threshold with respect to ground vibration varies depending on the age and condition of the structure in question. While modern industrial/commercial buildings can endure vibration levels up to a maximum of 0.5 inch per second PPV, older structures have a much lower vibration tolerance of 0.3 inch per second PPV. Furthermore, buildings of historical nature or extremely fragile structures have an even lower vibration damage threshold of 0.08 to 0.25 inch per second PPV as shown in Table IV.I‐8, Guideline Vibration Damage Potential Threshold Criteria.

FTA recommends maximum vibration levels associated with the nature of activities affected. These guidelines recommend a maximum of 75 VdB for frequent vibration events at institutional uses such as schools (78 VdB for occasional events and 83 VdB for infrequent events); and 72 VdB for frequent events at residences and buildings where people normally sleep (75 VdB for occasional events and 80 VdB for infrequent events); and 65 VdB for buildings where vibrations would interfere with interior operations, e.g. a building that might have sensitive equipment such as an optical microscope.15

15 Federal Transit Administration, “Transit Noise and Vibration Impact Assessment”, Table 8‐1, May 2006.

City of Los Angeles 10000 Santa Monica Boulevard PCR Services Corporation/SCH No. 2011041042 IV.I‐14

September 2011 IV.I. Noise

Table IV.I‐8

Guideline Vibration Damage Potential Threshold Criteria

Maximum PPV (inch per second) Continuous/Frequent Structure and Condition Transient Sources a Intermittent Sources b Extremely fragile buildings, ruins, ancient monuments 0.12 0.08 Fragile buildings 0.20 0.10 Historic and some old buildings 0.50 0.25 Older residential structures 0.50 0.30 New residential structures 1.00 0.50 Modern industrial/commercial buildings 2.00 0.50

a Transient sources created a single isolated vibration event, such as blasting or drop balls. b Continuous/frequent intermittent sources include impact pile drivers, pogo‐stick compactors, crack‐an‐seat equipment, vibratory pile drivers, and vibratory compaction equipment.

Source: Caltrans, Transportation‐ and Construction‐Induced Vibration Guidance Manual, Table 19, 2004.

3. PROJECT IMPACTS a. Methodology (1) On‐Site Construction Noise Noise impacts from on‐site construction, truck staging, and hauling are evaluated by determining the noise levels generated by the different types of construction activity, calculating the construction‐related noise level at nearby sensitive receptor locations, and comparing these construction‐related noise levels to existing ambient noise levels (i.e., noise levels without construction noise). More specifically, the following steps were undertaken to calculate construction‐period noise impacts:

1. Ambient noise levels at surrounding sensitive receptor locations were estimated based on field measurement data (see Table IV.I‐1 on page 5);

2. Typical noise levels for each construction equipment were obtained from the Federal Highway Administration (FHWA) roadway construction noise model (RCNM);

3. Distances between construction site locations (noise source) and surrounding sensitive receptors were measured using project architectural drawings, Google Earth, and site plans;

4. The construction noise level was then calculated, in terms of hourly Leq, for sensitive receptor locations based on the standard point source noise‐distance attenuation factor of 6.0 dBA for each doubling of distance; and

5. Construction noise levels were then compared to the construction noise significance thresholds identified below.

City of Los Angeles 10000 Santa Monica Boulevard PCR Services Corporation/SCH No. 2011041042 IV.I‐15

IV.I. Noise September 2011

(2) Off‐Site Roadway Noise (Construction and Operation) Roadway noise impacts have been evaluated using the Caltrans TeNS methodology based on the roadway traffic volume data provided in the Traffic Impact Study prepared for the proposed project. This methodology allows for the definition of roadway configurations, barrier information (if any), and receiver locations. Roadway noise attributable to project development was calculated and compared to baseline noise levels that would occur under the “without project” condition.

(3) Stationary Point‐Source Noise (Operation) Stationary point‐source noise impacts have been evaluated by identifying the noise levels generated by outdoor stationary noise sources such as rooftop mechanical equipment and loading dock activities, calculating the hourly Leq noise level from each noise source at surrounding sensitive receiver property line locations, and comparing such noise levels to existing ambient noise levels. More specifically, the following steps were undertaken to calculate outdoor stationary point‐source noise impacts:

1. Ambient noise levels at surrounding sensitive receptor locations were estimated based on field measurement data (see Table IV.I‐1 on page 5);

2. Distances between stationary noise sources and surrounding sensitive receptor locations were measured using project architectural drawings, Google Earth, and site plans;

3. Stationary‐source noise levels were then calculated for each sensitive receptor location based on the standard point source noise‐distance attenuation factor of 6.0 dBA for each doubling of distance;

4. Noise level increases were compared to the stationary source noise significance thresholds identified below; and

5. For outdoor mechanical equipment, the maximum allowable noise emissions from any and all outdoor mechanical equipment were specified such that noise levels would not exceed the significance threshold of 5 dBA identified below.

(4) Ground‐Borne Vibration (Construction and Operation) Ground‐borne vibration impacts were evaluated by identifying potential vibration sources, measuring the distance between vibration sources and surrounding structure locations, and making a significance determination based on the significance thresholds described below. b. Significance Thresholds Appendix G of the CEQA Guidelines provides a set of screening questions that address impacts with regard to Noise Impacts. These questions are as follows:

Would the project result in:

. Exposure of persons to or generation of noise levels in excess of standards established in the local general plan or noise ordinance, or applicable standards of other agencies;

City of Los Angeles 10000 Santa Monica Boulevard PCR Services Corporation/SCH No. 2011041042 IV.I‐16

September 2011 IV.I. Noise

. Exposure of persons to or generation of excessive groundborne vibration or groundborne noise levels; . A substantial permanent increase in ambient noise levels in the vicinity of the project above levels existing without the project; . A substantial temporary or periodic increase in ambient noise levels in the project vicinity above levels existing without the project.

(1) Construction The following thresholds of significance are set forth in the City of L.A. CEQA Thresholds Guide (2006), which states that a project would normally have a significant impact on noise levels from construction if:

 Construction activities lasting more than one day would exceed existing ambient exterior noise levels by 10 dBA or more at a noise‐sensitive use;

 Construction activities lasting more than 10 days in a three‐month period would exceed existing ambient exterior noise levels by 5 dBA or more at a noise‐sensitive use; or

 Construction activities would exceed the ambient noise level by 5 dBA at a noise‐sensitive use between the hours of 9:00 P.M. and 7:00 A.M. Monday through Friday, before 8:00 A.M. or after 6:00 P.M. on Saturday, or at any time on Sunday.

Since the project construction period would have a duration of more than 10 days and would not occur between the hours of 9:00 P.M. and 7:00 A.M. Monday through Friday, before 8:00 A.M. or after 6:00 P.M. on Saturday, or at any time on Sunday (consistent with provisions of the LAMC), noise during construction would have a significant impact if:

Noise 1 Project construction activities cause the exterior ambient noise level to increase by 5 dBA or more at a noise‐sensitive use, as measured at the property line of any sensitive use

(2) Operation The City of L.A. CEQA Thresholds Guide (2006) provides guidelines for defining significant noise impacts due to operations. The Los Angeles guideline states that a significant impact related to operational noise would result if:

Noise 2 The proposed project would cause ambient noise levels to increase by 5 dBA CNEL or more and the resulting noise falls on a land use within an area categorized as either “normally acceptable” or “conditionally acceptable” (see Table IV.I‐2 for description of these categories); or

Noise 3 The proposed project would cause ambient noise levels to increase by 3 dBA CNEL or more and the resulting noise falls on a land use within an area categorized as either “normally unacceptable” or “clearly unacceptable.”

City of Los Angeles 10000 Santa Monica Boulevard PCR Services Corporation/SCH No. 2011041042 IV.I‐17

IV.I. Noise September 2011

Noise 4 Project‐related operational (i.e., non‐roadway) noise sources such as outdoor building mechanical/electrical equipment increase ambient noise level by 5 dBA, thus causing a violation of the City Noise Ordinance.

In addition, the City of Los Angeles Noise Ordinance provides guidance for calculation of short term annoying sounds of the type that could be generated within the project’s parking structure. Accordingly the following threshold would apply:

Noise 5 The maximum noise (Lmax) generated from the operation of the parking structure (i.e., car alarm) exceeds the average (Leq) ambient noise level by 10 dBA.

(3) Ground‐Borne Vibration The City of Los Angeles does not have a significance threshold to assess vibration impacts during construction. Thus, the FTA and Caltrans standards described above are used to evaluate potential impacts related to project construction. All structures that are located within the immediate vicinity of the project site are considered “well engineered” (as opposed to “fragile” or “extremely fragile”). Therefore, impacts relative to ground‐borne vibration would be considered significant if the following future event were to occur:

Noise 6 Potential Building Damage ‐ Project construction activities cause ground‐borne vibration levels to exceed 0.5 inch per second PPV at the nearest off‐site building.

Noise 7 Potential Human Annoyance ‐ Project construction and operation activities cause ground‐ borne vibration levels to exceed 75 VdB at the Science and Technology Center; or 72 VdB at nearby residential development.

Noise 8 Potential Impact on Vibration Sensitive Equipment Use ‐ Project construction activities cause ground‐borne vibration levels to exceed 65 VdB (0.002 inch per second RMS) at the Science and Technology Center. c. Project Design Features

As noted in Section II., Project Description, project design features would be implemented by the Applicant as Conditions of Approval during design, construction and operation of the proposed project. The following project design features would be implemented as Conditions of Approval to reduce the level of noise generated by the project during construction and operations. These project design features were therefore taken into account in the analysis of potential project impacts.

(1) Construction . The project contractor(s) shall equip all construction equipment, fixed or mobile, with properly operating and maintained noise mufflers, consistent with manufacturers’ standards. . All construction equipment shall be stored on‐site. . All heavy truck traffic shall enter and exit the project site near its northwest corner, thus avoiding the use of local streets south of Santa Monica Boulevard.

City of Los Angeles 10000 Santa Monica Boulevard PCR Services Corporation/SCH No. 2011041042 IV.I‐18

September 2011 IV.I. Noise

. An approximately 20‐foot temporary noise barrier/wall capable of reducing noise by at least 15 dBA shall be erected along the southern edge of the project site adjacent to the Science and Technology Center, and a 12‐foot sound wall shall be located along Moreno Drive. . Anticipated extraordinary noise activities shall be coordinated with the BHHS school representatives. The Applicant shall coordinate with BHHS to limit noise‐generating construction activities during school activities that require a very quiet environment, like testing.

. The project shall limit construction hours to 7:00 A.M. to 9:00 P.M. on weekdays only, with no construction on weekends. Hauling shall be limited to the hours of 8:30 A.M. to 4:30 P.M. and would be scheduled to alleviate congestion at peak school times.

(2) Design Features to Reduce Operation Impacts . Outdoor mounted mechanical and electrical equipment in the vicinity of sensitive receptors shall be designed with appropriate noise control devices, such as sound attenuators, or acoustics louvers. . All rooftop mechanical equipment shall be enclosed or screened from view with parapet screening. . Loading docks and trash/recycling areas shall be enclosed within the project buildings. d. Analysis of Project Impacts Impacts of the project due to noise from project activities would, for the most part, be similar for development with the Conventional Parking Option and with the Automated Parking Option. For construction, both parking options would require similar excavation and grading for site preparation, similar foundation work, and substantially similar building erection programs. The maximum noise level on a given day, the basis of the analysis below, would be the same for both programs. Construction noise levels for the Automated Parking Option would be slightly reduced due to its smaller ancillary building, and reduced building erection. Further, noise impacts associated with the parking structure during project operations, e.g. horns, screeching wheels, etc., would not occur, as automobiles would be shut off and left at the entry‐ way to be moved by electronic conveyance systems. Otherwise, noise due to project operations would be the same under both options, since both options would have similar site uses and generate the same amount of traffic. As such, the following analysis addresses the impacts of both the Conventional Parking Option and the Automated Parking Option.

(1) Construction Noise (a) On‐Site Noise impacts from construction activities are generally a function of the noise generated by construction equipment, the equipment location, the sensitivity of nearby land uses, and the timing and duration of the noise‐generating activities. Construction activities at the project site would include four stages: (1) mass grading; (2) fine grading and foundation work; (3) building construction; and (4) paving. Each stage involves the use of different kinds of construction equipment, and therefore has its own distinct noise characteristics. Grading typically involves the use of such equipment as a rubber tired loader, backhoe, excavator, rubber tire dozer, drill rig, and other equipment. Fine grading and foundation work involves the use of such equipment as a rubber tired dozer, loader, tractor, backhoe, concrete pump truck, and water truck. Building construction typically involves the use of such equipment as cranes, forklifts, a skid steer loader, backhoes, generators, welders, concrete/industrial saws, concrete pumps and aerial lifts. Paving requires the use of cement and mortar mixers, pavers and paving equipment, and rollers. The proposed

City of Los Angeles 10000 Santa Monica Boulevard PCR Services Corporation/SCH No. 2011041042 IV.I‐19

IV.I. Noise September 2011 project would be constructed using typical construction techniques. No blasting or impact pile driving would be used.

Construction of the proposed project is estimated to last approximately three years. The existing project site does not require any demolition activities, however one mass site grading phase is expected for debris removal, as well as preparation of the ground for the one level of partially subterranean parking. This phase of construction activity includes the export of 11,000 cubic yards of soil during excavation. Foundations and concrete pouring would take approximately 12 months to complete and would overlap with the building construction/finishing which would take approximately 30 months.

Individual pieces of construction equipment that would likely be used for project construction produce maximum noise levels of 73 dBA to 90 dBA at a reference distance of 50 feet from the noise source, as shown in Table IV.I‐9, Maximum Noise Levels and Estimated Usage of Typical Construction Equipment. Pile driving systems and equipment would not be used. These maximum noise levels would occur when equipment is operating under full power conditions or during “impact” activities, such as jack hammering or sawing. However, equipment used on construction sites often operate under less than full power conditions, or part power. To more accurately characterize construction‐period noise levels, the average (Hourly Leq) noise level associated with each construction stage is calculated based on the quantity, type, and usage factors for each type of equipment that would be used during each construction stage and are typically attributable to multiple pieces of equipment operating simultaneously.

Using the conservative industry standard sound attenuation rate of 6 dB per doubling of distance for point sources (e.g., construction equipment), the worst‐case construction‐period noise levels were estimated at the noise sensitive receptors by phase of construction activity. A summary of noise level increases by receptor location and phase of construction activity is provided in Table IV.I‐10, Estimate of Construction Noise Levels at Off‐Site Sensitive Receiver Locations. The estimated noise levels represent a worst‐case scenario and the actual sound occurring at various locations would be less than that indicated in Table IV.I‐ 10 due to four factors: 1) the construction activities are analyzed as if they were occurring along the perimeter of the project site, whereas construction would typically occur throughout the site and only periodically at the perimeter of the site; 2) there are times when the construction activities are fewer than the maximums identified here; 3) there are times when the construction equipment operates at less than full power level, and 4) noise sensitive receptors that are located farther away from the project site would experience less construction noise, as sound diminishes away from the source, and due to intervening buildings between the source and receiver.

Estimates of the greatest impacts that might occur during construction hours at nearby sensitive receptors are shown in Table IV.I‐10. The closest sensitive uses to the project site are a residential unit located across Moreno Drive (R2) and BHHS located adjacent to the south side of the project site (R3). Estimated noise levels are also shown in Table IV.I‐10 for a location on Durant Drive approximately 300 feet east of the project site.

As indicated in Table IV.I‐10, the maximum noise events would exceed the significance threshold limits at the outside locations shown in the table. As also indicated, the sound diminishes with distance. At a distance of 300 feet from the project site, a distance that includes several residential units along Durant Drive and no

City of Los Angeles 10000 Santa Monica Boulevard PCR Services Corporation/SCH No. 2011041042 IV.I‐20

September 2011 IV.I. Noise

Table IV.I‐9

Maximum Noise Levels and Estimated Usage of Typical Construction Equipment

Type of Equipment Estimated Usage Factor Reference Noise Level at 50 feet, Lmax Air Compressor 40 – 50% 78 Backhoe, Loader, Tractor 25 – 50% 80 Cement and Mortar Mixers 10% 80 Concrete Pump 25 – 50% 81 Concrete Truck 25 – 40% 79 Concrete Saw 50% 90 Crane 25 – 50% 81 Dozer 40% 82 Drill Rig 25% 80 Excavator 25 – 40% 81 Forklift 10% 75 Generator 40 – 50% 81 Lift 20% 75 Rubber Tired Loader 50% 79 Dump / Haul Truck 20% 76 Other Equipment 50% 85 Paver 50% 77 Pavement Scarifier 20% 90 Roller 20% 80 Tractor / Loader / Backhoe 25% 80 Water Truck 10% 80

Source: FHWA 2005; and PCR Services Corporation, 2011. residential development farther south along Moreno Drive, the greatest sound levels have fallen to levels near the significance threshold.

Likewise, the sound would be similarly diminished at locations within the high school as the distance from the project site increases. Noise from the project site at the high school’s sensitive outdoor areas would also be reduced by intervening buildings. For example, the school lawn area is located approximately 500 feet from the project site, and is partially obstructed from direct sound by existing school buildings, most notably the Science and Technology Center. The area between the Science and Technology Center and the proposed project site, is a driveway road without noise sensitive activity, although students would walk in the vicinity of the project site coming and going to classes. As indicated in Table IV.I‐10, the greatest sound levels would exceed the significance threshold.

A temporary 20‐foot wall would be installed along the project boundary adjacent to the high school which would provide a 15 dB noise reduction, when the noise barrier breaks the line‐of‐sight between the construction equipment and the receivers. Thus, the noise barrier would lessen impacts at ground level. The barrier would also reduce sound levels for all four floors of the Science and Technology Center from sound sources located along the edge of the project. However, as work activities occur deeper within the project site, the barrier would only break the line‐of‐sight for the 1st and 2nd floors of the Science and Technology

City of Los Angeles 10000 Santa Monica Boulevard PCR Services Corporation/SCH No. 2011041042 IV.I‐21

IV.I. Noise September 2011

Table IV.I‐10

Estimate of Construction Noise Levels at Off‐Site Sensitive Receiver Locations

Estimated Construction Noise Levels at the Noise Sensitive Nearest b Distance from Receptor by Construction Phase Would Construction Hourly Leq (dBA) Construction Activity to Fine Project’s Noise Exceed Noise Grading/Foun Building Significance Significance Noise Sensitive Receptor Mass Grading dation Construction Paving Thresholdc Threshold? Receptor a (2 months) (12 months) (30 months) (1.5 months) (dBA) (dBA) R2 – Nearest residential (east 60 feet 79 75 81 66 61 Yes of project site) f R3 ‐ Science & Technology 25 feet/50 77/86 73/82 79/88f 73 d 57 Yes Center – Exterior feet d – 3rd & 4th Floors R3 ‐ Science & Technology 25 feet/50 77/71 73/67 79/73 58d 57 Yes Center – Exterior feet d – 1st & 2nd Floors R4 – Residential uses (southeast of 300 feet 60 56 62 56 60 Yes project site)e a Construction noise levels at R1 are not estimated since R1 represents the noise environment at the project site. b Estimated construction noise levels represent the worst‐case scenario when noise generators are located closest to the receptors and are not expected to last the entire construction duration. c Measured ambient noise levels for daytime weekday conditions (there is no construction on nights or weekends) plus 5 dBA. d Sound levels along the northern edge of the project site and 25 feet within the project site (ie. 25 feet and 50 feet from the Science and Technology Center). Paving activities would not occur within this area and the sound levels shown are at a distance of 200 feet to the area where site paving would be provided. e Partially shielded from the project site by existing buildings, also inclusive of a 5 dBA reduction for the proposed sound barrier that would be located along Moreno Drive. f Inclusive of 5 dBA reduction for sound barrier.

Source: PCR Services Corporation, 2011.

Center and the temporary noise barrier would not be effective (break the line‐of‐sight) for the upper stories (i.e., the 3rd and 4th floors) of that building. Therefore, the greatest sound impacts to the Science and Technology Center would occur at 50 feet from the building (i.e. 25 feet within the project site), not the edge of the project site, and would be experienced at the building’s 3rd and 4th floors.

In addition to these sensitive uses where the greatest project impacts would occur, there may be a lesser impact at a nearby, private, rooftop recreation deck at an adjacent 7 story parking structure. Impacts would be less than those at the more sensitive uses discussed above, due to height distance and that building’s walls

City of Los Angeles 10000 Santa Monica Boulevard PCR Services Corporation/SCH No. 2011041042 IV.I‐22

September 2011 IV.I. Noise acting as a sound barrier between construction noise generation at ground level and the lower levels of new structures, and the roof top uses, particularly in closer vicinity to those roof‐top uses.

(b) Off‐Site In addition to on‐site construction noise, haul trucks, delivery trucks, and construction workers would require access to the project site throughout the project’s construction period. While construction workers would arrive from many parts of the region, and thus different directions, haul trucks and delivery trucks would generally access the site via a planned route intended to minimize noise impacts to areas south and east of the project site. All heavy truck traffic would come from the west on Santa Monica Boulevard and enter and exit the project site at its northwest corner.

By limiting the access to the site for heavy trucks/equipment to its northwest corner, all such traffic would avoid passing in the proximity of the sensitive residential and school uses located along Moreno Drive. Therefore, the off‐site noise from such traffic would be less than significant.

(2) Construction Vibration Construction machinery and operations can generate varying degrees of ground vibration, depending on the construction procedures and the construction equipment used. The construction activities that typically generate the most severe vibrations, blasting and impact pile driving, would not be used for this project. The operation of construction equipment generates vibrations that spread through the ground and diminish in amplitude with distance from the source. The effect on buildings located in the vicinity of a construction site often varies depending on soil type, ground strata, and construction characteristics of the receptor buildings. The results from vibration impacts can range from no perceptible effects at the lowest vibration levels, to low rumbling sounds and perceptible vibration at moderate levels, to slight damage at the highest levels. Ground‐borne vibration from construction activities rarely reach the levels that damage structures. The Federal Transit Association (FTA) has published standard vibration velocities, in terms of PPV, for construction equipment operations. The typical vibration PPV and RMS levels for construction equipment pieces anticipated to be used during project construction are listed in Table IV.I‐11, Typical Vibration Velocities for Potential Project Construction Equipment.

Table IV.I‐11

Typical Vibration Velocities for Potential Project Construction Equipment

Reference Vibration Source Levels Equipment PPV at 25 feet VdB at 25 feet Large bulldozer 0.089 87 Caisson drilling 0.089 87 Loaded trucks 0.076 86 Jackhammer 0.035 79 Small bulldozer 0.003 58

Source: USDOT Federal Transit Administration, 1995.

City of Los Angeles 10000 Santa Monica Boulevard PCR Services Corporation/SCH No. 2011041042 IV.I‐23

IV.I. Noise September 2011

The proposed project would generate ground‐borne vibration during site clearing, grading and foundation construction; and lesser vibration associated with general building construction. The estimated vibration levels at the sensitive receptor locations (V1) the Science and Technology Center, and V(2) and (V3) residential locations east of the project site are shown in Table IV.I‐12, Estimate of Construction Vibration Levels at Off‐Site Sensitive Receiver Locations.

Table IV.I‐12

Estimate of Construction Vibration Levels at Off‐Site Sensitive Receiver Locations

Estimated Construction Vibration Levels at the Noise a Nearest Sensitive Receptor by Construction Phase Significance Threshold Distance from Fine Site Construction Mass Site Grading/ Building Vibration Vibration Activity to Grading Foundations Construction Paving Building Human Sensitive Sensitive Vibration (2 month) (12 months) (30 months) (1.5 months) Damage Annoyance Equipment Receptor Receptor (PPV/VdB) (PPV/VdB) (PPV/VdB) (PPV/VdB) (PPV) (VdB) (VdB) V1 –Science & 25 feet Technology Exterior/ 0.089/77 c 0.089/77 c 0.024/69 c 0.004/58 c 0.5 75VdB 65 Center Interior b V2 ‐ Nearest 60 feet Residential Exterior/ 0.024/74 d 0.024/74 d 0.020/73 d 0.003/61 d 0.5 72VdB ‐‐e (east of project Interior b site) V3 ‐ Residential 300 feet uses Exterior/ 0.002/61 0.002/61 0.002/59 0.001/56 0.5 72VdB ‐‐e (southeast of Interior b project site) a Estimated construction vibration levels represent the worst‐case scenario when vibration generators are located closest to the receptors and infrequent, greatest impact construction activities are occurring. b Exterior PPV values are used for evaluating potential impacts on buildings. VdB values are used for evaluating potential impacts regarding human annoyance and sensitive scientific equipment effects. c Inclusive of a 10 VdB reduction loss in vibration level due coupling loss associated with a 2 – 4 story masonry building per FTA guidelines. d Inclusive of a 5 VdB reduction loss in vibration level due coupling loss associated with a residential building per FTA guidelines e Not evaluated for vibration sensitive equipment uses at residential receptors.

Source: PCR Services Corporation, 2008.

As indicated, the greatest exterior vibration level at any location is estimated to be 0.089 PPV. This level of vibration is substantially below the 0.5 PPV threshold for potential building impacts. Therefore, potential impacts on buildings due to vibration would be less than significant at all locations.

Potential interior vibration levels for two residential locations (V2) and (V3) are included in Table IV.I‐12 to address potential impacts regarding potential annoyance impacts in the nearby neighborhood. As indicated, the greatest level of interior vibration at the residential unit nearest to the project site would be 74 VdB. This is the greatest impact that could occur from high vibration construction equipment working at the

City of Los Angeles 10000 Santa Monica Boulevard PCR Services Corporation/SCH No. 2011041042 IV.I‐24

September 2011 IV.I. Noise eastern edge of the project site; an event that would not be associated with most of the construction activities on the project site. This level of vibration would exceed the significance threshold of 72 VdB for frequent vibration at residences/buildings where people normally sleep. It would be within the 80 VdB standard for infrequent events and within the frequent event 75 VdB threshold associated with primarily day time uses. The project’s maximum impact would occur infrequently over the duration of the course of project construction, would not occur during night‐time hours, and would not be generally expected to impact sleeping activities. Impacts at other residential development would be substantially less than that noted for the closest residential unit. The next two closest residential units are located approximately 120 feet from the project. At those locations, the interior vibration level would be reduced to 68 VdB. For these reasons, the level of vibration experienced in the nearby neighborhood would minimal. Notwithstanding, it is conservatively concluded that the estimated 74 VdB would be significant prior to mitigation. A mitigation measure is included below to reduce this potential impact to a less than significant impact.

As indicated in Table IV.I‐12, the estimated interior vibration within the Science and Technology Center (V1) is estimated to be 77 VdB during those times when the most intense vibration equipment is operated along the edge of the project site. This maximum level of vibration is marginally above the 75 VdB frequent event vibration threshold for human annoyance in institutional settings. It is within the 78 VdB threshold for occasional events at such institutional uses. This worst‐case level of vibration diminishes as vibration activity moves away from the Science and Technology Center and falls below the 75 VdB threshold at about 35 feet of distance (or 10 feet into the project site). The 77 VdB would also exceed the project’s significance threshold of 65 VdB for vibration sensitive equipment. As such, vibration impacts associated with construction could potentially be significant, prior to mitigation, if vibration sensitive scientific equipment were being operated in the vicinity of the project site. In this worst‐case scenario where construction equipment is operating at the perimeter of the project site, vibration impacts regarding the use of sensitive equipment would be reduced to a less than significant level at approximately 100 feet from the Science and Technology Center, or at a distance of 75 feet within the project site. Mitigation measures are included below to reduce potential vibration impacts at the Science and Technology Center.

(3) Operational Noise Operational project impacts to neighboring noise‐sensitive receptor locations include noise that would be generated by off‐site roadway noise, on‐site mechanical equipment/point sources (i.e., loading dock and trash pick‐up areas), parking facilities, outdoor recreation activities and rooftop helipad‐related noise.

(a) Off‐Site Roadway Noise As described in Section IV.K of the Draft EIR, the proposed project is estimated to generate 1,189 daily trips. This change in roadway traffic volumes was analyzed to determine if traffic‐related noise impacts would result from project development. Table IV.I‐13, Off‐Site Traffic Noise Analysis, provides a summary of the off‐site roadway noise analysis results. Included in this table are calculated CNEL noise levels at a reference distance of 25 feet for the roadway segments with noise sensitive uses for the following scenarios: (1) existing conditions; (2) future without project; and (3) future with project. The project‐generated traffic noise impact is determined by comparing the increase in noise levels (from future without project to future with project) and the project’s significance threshold.

As shown in Table IV.I‐13, the existing maximum increase in project‐related traffic noise levels would be 0.5 dBA, which would occur along Santa Monica Boulevard between Century Park East and Moreno Drive.

City of Los Angeles 10000 Santa Monica Boulevard PCR Services Corporation/SCH No. 2011041042 IV.I‐25

IV.I. Noise September 2011

Table IV.I‐13

Off‐Site Traffic Noise Analysis

Boulevard Between Century Park 72.3 72.4 73.0 73.1 0.1 0.1 0.8 East & Moreno Dr. Wilshire Boulevard Northwest of Santa 71.0 71.0 71.7 71.7 0.0 0.0 0.7 Monica Blvd. Olympic Boulevard Between Overland Ave. & 65.0 65.0 65.5 65.5 0.0 0.0 0.5 Prosser Ave. Between Prosser Ave. & 68.1 68.1 68.5 68.5 0.0 0.0 0.4 Beverly Glen Blvd. Between Beverly Glen Blvd. & Century Park 71.2 71.2 71.5 71.5 0.0 0.0 0.3 West Between Century Park West and Century Park 66.7 66.7 67.2 67.2 0.0 0.0 0.5 East Between Century Park 60.1 60.1 61.2 61.2 0.0 0.0 1.1 East & Spalding Dr. East of Spalding Dr. 61.8 61.9 63.2 63.2 0.1 0.0 1.4 Roxbury Drive North of Santa Monica 60.4 60.4 60.6 60.6 0.0 0.0 0.2 Blvd. North of Olympic Blvd. 59.4 59.4 59.6 59.6 0.0 0.0 0.2 South of Olympic Blvd. 59.8 59.8 60.0 60.0 0.0 0.0 0.2 Roxbury Drive/Brighton

Way South of Wilshire Blvd. 59.8 59.8 60.0 60.0 0.0 0.0 0.2 Bedford Drive

City of Los Angeles 10000 Santa Monica Boulevard PCR Services Corporation/SCH No. 2011041042 IV.I‐26

September 2011 IV.I. Noise

Table IV.I‐13 (Continued)

Off‐Site Traffic Noise Analysis

Calculated Traffic Noise Levels at 25 feet from Roadway Right‐of‐Way, CNEL (dBA) Existing Existing Future with Future Future with Project Project Cumulative Existing Project a No Project a Project a Increment a Increment e Increment f Roadway Segment (A) (B) (C) (D) (B‐A) (D‐C) (D‐A) North of Santa Monica 60.3 60.3 60.6 60.6 0.0 0.0 0.3 Blvd. Prosser Avenue North of Olympic Blvd. 58.4 58.4 58.6 58.6 0.0 0.0 0.2 South of Olympic Blvd. 58.3 58.3 58.6 58.6 0.0 0.0 0.3 Beverly Glen Boulevard North of Santa Monica 69.2 69.2 69.5 69.5 0.0 0.0 0.3 Blvd. Between Santa Monica 67.2 67.2 67.6 67.6 0.0 0.0 0.4 Blvd. & Olympic Blvd. South of Olympic Blvd. 65.6 65.6 66.2 66.2 0.0 0.0 0.6 Veteran Drive North of Santa Monica 64.4 64.4 64.7 64.7 0.0 0.0 0.3 Blvd. South of Santa Monica 63.4 63.4 63.6 63.6 0.0 0.0 0.2 Blvd. Overland Avenue Between Santa Monica 66.3 66.3 67.3 67.3 0.0 0.0 1.0 Blvd. & Olympic Blvd. South of Olympic Blvd. 68.2 68.4 69.3 69.3 0.2 0.0 1.1 Century Park West Between Santa Monica 64.7 64.7 65.6 65.6 0.0 0.0 0.9 Blvd. & Constellation Ave. Between Constellation 65.7 65.8 66.6 66.6 0.1 0.0 0.9 Ave. & Olympic Blvd. Century Park East Between Olympic Blvd. & 66.5 66.5 66.7 66.7 0.0 0.0 0.2 Pico Blvd. Spalding Drive North of Olympic Blvd. 63.2 63.4 63.7 63.7 0.2 0.0 0.5 South of Olympic Blvd. 58.1 58.1 58.4 58.4 0.0 0.0 0.3 North of Moreno Dr. 62.7 62.8 62.9 63.0 0.1 0.1 0.3 Avenue of the Stars Between Santa Monica 69.3 69.3 70.7 70.7 0.0 0.0 1.4 Blvd. & Constellation Ave. Between Constellation 69.9 69.9 71.0 71.0 0.0 0.0 1.1 Ave. & Olympic Blvd. Moreno Drive Between Santa Monica 61.9 62.2 62.2 62.5 0.3 0.3 0.6 Blvd. & Durant Dr. South of Durant Dr. 63.1 63.2 63.3 63.5 0.1 0.2 0.4 Durant Drive

City of Los Angeles 10000 Santa Monica Boulevard PCR Services Corporation/SCH No. 2011041042 IV.I‐27

IV.I. Noise September 2011

Table IV.I‐13 (Continued)

Off‐Site Traffic Noise Analysis

Source: PCR Services Corporation, 2011.

As the 0.5 dBA at one location increase falls well below the more conservative 3 dBA CNEL significance threshold and would not be perceptible, roadway noise level increases would be less than significant. No mitigation measures are required. It may also be noted that the existing ambient CNEL levels in the project vicinity are the highest along Santa Monica Boulevard. The proposed project buildings would act as a sound barrier to existing noise source on Santa Monica Boulevard, thus reducing some sound that reaches the high school and residential areas south of the project site.

(b) Stationary Point‐Source Noise This section considers potential noise impacts to neighboring noise‐sensitive properties related to specific noise sources associated with the operation of the proposed project. Such potential noise sources include:

. Outdoor mounted mechanical and electrical equipment (e.g., heating, ventilation, and air conditioning [HVAC] equipment and emergency generator); . Loading dock and trash/recycling areas; . Parking facilities; . Outdoor Open Space, and . Emergency Helipad

City of Los Angeles 10000 Santa Monica Boulevard PCR Services Corporation/SCH No. 2011041042 IV.I‐28

September 2011 IV.I. Noise

A discussion of each of these noise sources is provided below, followed by a discussion of the potential composite noise level increase (due to concurrent operation of multiple noise sources) at each sensitive receptor location.

(i) Mechanical Equipment The proposed project would likely require building mechanical HVAC equipment to condition and ventilate the indoor air environment. This equipment would be expected to include air handling units, condenser fans, exhaust fans (for buildings and parking structures), a standalone central plant building located at the southwest corner of the site containing chillers/ cooling towers and pumps, and an emergency generator room within the parking structure to support the intended function of the proposed project. Project design features, including enclosure or screen/parapet wall, would ensure that all equipment noise levels would comply with the City of Los Angeles Noise Ordinance requirements (i.e., noise levels would result in a maximum 5 dBA increase above the ambient noise levels). Thus, impacts associated with mechanical equipment would be less than significant. No mitigation measures are required.

(ii) Loading Dock and Refuse Collection Areas The proposed project’s loading dock and refuse collection areas would be within the northwestern portion of the site; and located within the project’s structure off of Santa Monica Boulevard. As such, loading docks and refuse collection would not have any unobstructed openings that face toward any noise‐sensitive receptor location. Therefore, noise level increases would not exceed the 5 dBA Leq (1‐hour) significance threshold at the closest or any other off‐site noise‐sensitive receptor location. As such, impacts would be less than significant, and no mitigation measures would be required.

(iii) Parking Facility Noise Levels The project’s partially subterranean parking level would be sheltered and therefore would not result in noise impacts at any noise‐sensitive receptor locations. The parking in the ancillary building, (9 stories under the Conventional Parking Option and 4 stories under the Automated Parking Option) would have limited openings toward the residential and school uses (R2 and R3) located to the eastern and southern sides of the site, respectively. Various noise events would occur periodically from the parking facilities. Such periodic events would include activation of car alarms, sounding of car horns, slamming of car doors, engine revs, and tire squeals. Automobile movements would comprise the most continuous noise source and would generate a noise level of approximately 65 dBA at a distance of 25 feet. Car alarm and horn noise events generate sound levels as high as 83 dBA at a reference distance of 25 feet, however these noise sources would be sporadic and primarily limited to the daytime. Impacts such as these would be associated with the proposed project’s Conventional Parking Option, but would be reduced with the Automated Parking Option, as cars would be shut off at the garage entry and conveyed via electric mechanisms.

The nearest residential uses and school use, R2 and R3, are approximately 275 feet and 60 feet from east and south of the proposed parking structure, respectively. Based on a noise level source strength of 83 dBA at a reference distance of 25 feet, and accounting for barrier‐insertion loss from the parapet wall at the perimeter of the proposed parking structure (minimum 10 dBA insertion loss) and distance attenuation (minimum 21 dBA loss for 275 feet of distance and minimum 8 dBA loss for 60 feet distance), parking related noise would be reduced to 52 dBA (Lmax) at the R2 residential development across Moreno Drive and 65 dBA at R3, at the Science and Technology Center, the closest high school location. The estimated noise levels would exceed the current Leq nighttime ambient level of 48 dBA by 4 dBA at the R2 adjacent residential uses and

City of Los Angeles 10000 Santa Monica Boulevard PCR Services Corporation/SCH No. 2011041042 IV.I‐29

IV.I. Noise September 2011 would not exceed the 10 dBA threshold of significance for maximum noise (Lmax) levels at the residential uses. The nearest school location where the 65 dBA would occur is a driveway with its own traffic noise, possible horn honking, etc., which ties into other road/access ways (e.g. Moreno Drive). More sound sensitive locations within the high school would be blocked from parking structure sounds by existing buildings which would provide at least 10 dBA reduction in sound. There would be additional sound attenuation due to the distance to the more sensitive uses. For example, the distance to the corner of the Science and Technology Center along Moreno Drive provides 160 feet or an additional 8 dBA of attenuation. The existing building attenuation alone would reduce the 65 dBA to 55 dBA which is well below the 62 dBA threshold that is based on a 10 dBA increment over the existing weekday ambient level. An additional 8 dBA of attenuation, for example would reduce the level to 48 dBA.

(iv) Outdoor Open Space Areas Project residents would perform passive activities within the project’s landscaped open space area; and recreation activities such as swimming and court games on the roof‐deck recreation area. These would be low intensity uses which would generate low levels of noise. Further, the more active roof‐top activities would be located along the western edge of the project site, thus separated from the sensitive off‐site uses to the east and southeast. Such impacts would not increase ambient noise levels at off‐site receptors and would be less than significant.

(v) Rooftop Helipad Noise Levels The proposed project would include an emergency helipad pursuant to LAMC requirements.16 As such, the helipad would be used for emergency purposes only. Due to infrequent use and the emergency nature of such a use, adverse noise impacts related to helipad uses would be less than significant.

(vi) Composite Noise Level Impacts from Project Operations An evaluation of noise from all proposed project sources (i.e., composite noise level) was conducted to conservatively ascertain the potential maximum project‐related noise level increase that may occur at the noise‐sensitive receptor locations included in this analysis. The overall sound environment at the areas surrounding the project is comprised of contributions from each individual noise source associated with the typical daily operation of the proposed project. Primary noise sources associated with the project would include noise associated with traffic, mechanical equipment, the parking facility, and loading dock/refuse collection.

The only noise‐sensitive locations where composite noise impacts could occur are at the residential uses east of the project site (R2) and school uses south of the project site (R3). Other noise sensitive receptors, which are located at a distance from the project site, and which are shielded from project noise by intervening structures, would only be impacted by the project’s roadway noise, the potential impacts of which are fully analyzed above.

The noise analysis for different project sources (i.e., off‐site traffic, on‐site mechanical/electrical equipment, parking facility and loading dock/refuse collection) were made using various noise descriptors (i.e., 24‐hour

16 City of Los Angeles Municipal Code Section 57.118.12 requires that buildings over 75 feet in height be equipped with an emergency helipad.

City of Los Angeles 10000 Santa Monica Boulevard PCR Services Corporation/SCH No. 2011041042 IV.I‐30

September 2011 IV.I. Noise

CNEL, 1‐hour Leq, and instantaneous Lmax). However, in order to evaluate the combined noise effect of all sources a common noise descriptor, CNEL, is used. Based on the traffic noise analysis above, the project‐ related traffic would not increase the traffic‐related noise in the vicinity of the project site. Project‐related mechanical equipment, as described above, would be shielded from all noise sensitive receptors through project design features and also would be designed to meet the City’s Noise Ordinance (i.e., allowing a maximum of 5 dBA above ambient noise levels). The mechanical equipment related noise was analyzed in terms of hourly Leq. Therefore, a conversion from Leq to CNEL is made in order to be added to the traffic noise level. As indicated in Table IV.I‐1 on page 5, the lowest measured hourly Leq ambient noise levels at R2 and R3 (48 and 45 dBA, respectively) are at least 12 dBA lower than the measured 24‐hour CNEL levels (recorded 61 dBA at R2 and 57 dBA at R3). Therefore, it is anticipated that by meeting the City’s Noise

Ordinance in terms of hourly Leq (maximum of 5 dBA above the lowest ambient noise levels), the project mechanical‐related noise in terms of CNEL would be approximately 10 dBA below the existing ambient noise levels. The new parking structure is partially enclosed (i.e., parking garage with limited openings) and the parking facility noise would not exceed the existing ambient noise levels at the sensitive receptor R2 by 10 dBA and the interior noise standards for classrooms inside the high school Science and Technology Center. Therefore, parking related noises would be less than significant. As previously mentioned, the loading docks and refuse collections areas would be located within the northwestern portion of the project site, which would not have any unobstructed openings that face toward any noise‐sensitive receptor locations. Therefore, noise associated with the loading docks and refuse collection transference to the outside would be negligible and would not increase the overall ambient noise levels.

In summary, the project‐related traffic would not increase the ambient noise in the vicinity of the project site. The mechanical and parking facility related noise are expected to be well below the existing ambient noise level (i.e., minimum 10 dBA CNEL). Therefore, the overall noise level from all project sources would have a less than 1.0 dBA CNEL contribution to the composite noise environment. Overall, relative to the existing noise environment, the proposed project is estimated to increase the ambient sound level at the nearest noise sensitive receptors (R2 and R3) by less than 1 dBA (CNEL), which is considered less than perceptible. Composite noise impacts at all other receptors are expected to be less 1 dBA (CNEL). As such, the composite noise level impact due to the proposed project’s operations would be less than significant.

(4) Vibration Associated with Project Operation The proposed project would include typical residential and commercial‐grade stationary mechanical and electrical equipment such as air handling units, condenser units, exhaust fans, cooling towers, and electrical emergency power generators, which would produce vibration. In addition, the primary sources of transient vibration would include passenger vehicle circulation within the proposed parking facilities, on‐site refuse/delivery truck activity, and on‐site loading dock/refuse collection area activity. Vibration levels were analyzed to assess potential impacts at the nearest adjacent structure (BHHS represented by V1) located approximately 85 feet away from a proposed driveway; and approximately 250 feet from the project’s loading and truck delivery location.

Ground‐borne vibration generated by each of the above‐mentioned activities were estimated using vibration measurement data collected at existing off‐site facilities, including parking facilities, refuse/delivery truck ingress/egress paths, and loading dock/refuse collection areas, that are similar to the proposed on‐site structures. These measured vibration values and estimated levels at the nearest receptor (V1) are shown on Table IV.I‐14, Project Operational Vibration Analysis. As indicated on Table IV.I‐14, the estimated vibration

City of Los Angeles 10000 Santa Monica Boulevard PCR Services Corporation/SCH No. 2011041042 IV.I‐31

IV.I. Noise September 2011

Table IV.I‐14

Project Operational Vibration Analysis

Approximate Distance Estimated Maximum Measured Maximum from Vibration Sources Vibration Velocity at Vibration Velocity to nearest Receptor nearest Receptor (V1) Vibration Sources inch/second RMS (V1) inch/second RMS/VdB Parking structure and 0.002 @ reference 60 feet 0.0009/59 surrounding roadways distance of 35 feet Refuse/delivery truck 0.008 @ reference 250 feet 0.0001/40 circulation distance of 15 feet Loading dock/refuse 0.002 @ reference 250 feet 0.0001/40 collection area activities distance of 35 feet

Source: PCR Services Corporation, 2008. levels of 0.0009 inch per second RMS (59 VdB) at the Science and Technology Center (V1) is below the 65 VdB significance threshold for vibration sensitive equipment uses (which is more stringent than the annoyance significance threshold). As such, vibration impacts associated with operation of the project would be below the significance threshold. Thus, impacts would be less than significant and no mitigation measures are required.

4. CUMULATIVE IMPACTS As discussed in Section III of this EIR, there are 40 related projects located in the vicinity of the project site. Of the 40 related projects, the three closest are situated approximately 300 feet, 500 feet, and 600 feet from the project site including Related Project No. 20 located at 9900 Wilshire Boulevard (mixed‐use), Related Project No. 23 located at 9936 Durant Drive (condominium), and Related Project No. 22 located at 9876 Wilshire Boulevard (Beverly Hilton), respectively. Other related projects are situated approximately 850 feet and 900 feet from the project site, including Related Project No. 18 located at 1950 Avenue of the Stars (office) and Related Project No. 24 located at 9900 Santa Monica Boulevard (office building), respectively. All other related projects are located a minimum of 1,500 feet away from the project site. The potential for noise impacts to occur are specific to the location of each related project, as well as the cumulative traffic on the surrounding roadway network. a. Construction Noise Noise from on‐site construction activities are localized and would normally affect the areas within 500 feet from the individual construction site. Since the timing of the construction activities for these related projects cannot be defined and are beyond the control of the City and the Applicant, any quantitative analysis that assumes multiple, concurrent construction projects would be entirely speculative. However, if Related Project No. 20, No. 23, and No. 22 proceed and involve construction activities at the same time as the proposed project, the multiple projects could contribute to cumulative construction noise impacts on the noise sensitive receptors that are located between the identified related projects and the proposed project, including the multi‐family residential uses (R2) and the school uses (R3) along Moreno Drive. Related

City of Los Angeles 10000 Santa Monica Boulevard PCR Services Corporation/SCH No. 2011041042 IV.I‐32

September 2011 IV.I. Noise

Project No. 18 and Related Project No. 24 are located 850 feet and 900 feet from the project site, respectively. Intervening buildings are located between the related project and the project site. This would preclude a cumulative impact on the multi‐family residential uses (R2) and the school uses (R3) along Moreno Drive.

In addition, if Related Project No. 20 and No. 23 were to be completed before the proposed project, significant construction noise impacts could occur at Related Project No. 20 and No. 23 (residential uses). However, those noise levels would be intermittent, temporary, and would cease at the end of the construction phase, and would comply with time restrictions and other relevant provisions of the LAMC. Noise associated with construction activities would be reduced to the degree reasonably and technically feasible through proposed mitigation measures for each individual project and compliance with the City’s noise ordinances. Thus, even with proposed mitigation measures, if nearby related projects were to be constructed concurrently with the proposed project, significant and unavoidable cumulative construction noise impacts could result at the nearby noise sensitive receptors (R2 and R3).

Due to the rapid attenuation characteristics of ground‐borne vibration and distance of the related projects to the proposed project, there is no potential for cumulative construction‐ or operational impacts with respect to ground‐borne vibration. b. Operational Noise The project site and surrounding area have been developed with uses that have previously generated, and would continue to generate, noise from a number of community noise sources including vehicle travel, mechanical equipment (e.g., HVAC systems), and lawn maintenance activities. Each of the related projects that have been identified within the general project vicinity would also generate stationary‐source and mobile‐source noise as a result of ongoing day‐to‐day operations. The related projects are general residential, retail, commercial, or institutional in nature. Such uses are not typically associated with excessive exterior noise. However, each project would produce traffic volumes that are capable of generating roadway noise impacts. As shown in Table IV.I‐13, above, cumulative traffic volumes would result in a maximum increase of 1.4 dBA CNEL along the segments of Olympic Boulevard east of Spalding Drive and Avenue of the Stars between Santa Monica Boulevard and Constellation Avenue. As this noise level increase would be below the conservative 3 dBA CNEL significance threshold, roadway noise impacts associated with cumulative traffic volumes would be less than significant.

Due to LAMC provisions that limit stationary‐source noise from items such as roof‐top mechanical equipment and emergency generators, noise levels would be less than significant at the property line for each related project. For this reason on‐site stationary noise produced by any related project would not be additive to project‐related noise levels. As the project’s composite stationary‐source impacts would be less than significant, composite stationary‐source noise impacts attributable to cumulative development would also be less than significant. In addition, based on the location of the proposed project relative to the related projects (with intervening buildings and roadways), the location of sensitive receptors, and the parking‐ related noise that would result from the project, significant cumulative impacts associated with parking‐ related noise sources would not occur.

City of Los Angeles 10000 Santa Monica Boulevard PCR Services Corporation/SCH No. 2011041042 IV.I‐33

IV.I. Noise September 2011

5. MITIGATION MEASURES a. Construction

Construction‐related noise has the potential to result in significant noise and vibration impacts at sensitive receptors. Project Design Features to reduce potential noise impacts include a 20‐foot sound barrier wall adjacent to Beverly Hills High School on the south side of the project site, and a 12‐foot sound barrier wall on the eastern side of the project site that faces the residential development across Moreno Drive. In addition, to the provision of the sound barriers, the following mitigation measures are proposed.

Mitigation Measure I‐1: Exterior on‐site construction activities shall be limited to Monday through Friday from 7:00 A.M. to 9:00 P.M.

Mitigation Measure I‐2: The construction staging area shall be located within the project site.

Mitigation Measure I‐3: To avoid vibration impacts to the nearest residential unit to the project site, construction equipment within 75 feet of that unit (i.e. 15 feet within the project site) shall limit vibration equipment to machinery expected to generate no more than 85 VdB at 25 feet. (See Vibration Mitigation Zone 1 on Figure IV.I‐2, Vibration Mitigation Zones.)

Mitigation Measure I‐4: The Applicant shall designate a construction relations officer to serve as a liaison with surrounding property owners including Beverly Hills High School. The liaison shall be responsible for responding to concerns regarding construction noise or vibration. The liaison’s telephone number(s) shall be posted at multiple locations along the perimeter of the project site. In addition, the liaison shall coordinate with Beverly Hills High School administration in advance of, and throughout project construction to reduce disruption of class‐room activities. The liaison shall work with the School administration to identify opportunities to reduce conflicts with school activities through work scheduling and the arrangement of construction activities on the project site.

Mitigation Measure I‐5: To avoid vibration impacts on student activity in the Science and Technology Center:

a) High vibration construction activities shall be avoided within 35 feet of the Science and Technology Center (i.e. along the southern 10 feet of the project site facing that building) during class‐room sessions, when school is in session. (See Vibration Mitigation Zone 2 on Figure IV.I‐2.)

b) If based on consultation with the administrator at Beverly Hills High School it is determined that highly sensitive equipment, e.g. microscopes, are in use at the Science and Technology Center, high vibration activities within 100 feet of that building shall be coordinated through consultation between the construction relations officer and the school administrator to reduce impacts at times of equipment use through scheduling, staging and equipment control of construction activities. (See Vibration Mitigation Zone 3 on Figure IV.I‐2.)

City of Los Angeles 10000 Santa Monica Boulevard PCR Services Corporation/SCH No. 2011041042 IV.I‐34

Vibration Mitigation Zone 1

Vibration Mitigation Zone 3

BEVERL Y HILLSHILLS UNIFIEDUNIFIED SCHOOLSCHOOL

DISTRICTDISTRICT ,, OWNEROWNER

Vibration Mitigation Zone 2

N Vibration Mitigation Zones FIGURE 0 64 Feet 10000 Santa Monica Boulevard IV.I-2 Source: Handel Architects, LLP; PCR Services Corporation, 2011. PCR IV.I. Noise September 2011

This page is intentionally blank.

City of Los Angeles 10000 Santa Monica Boulevard PCR Services Corporation/SCH No. 2011041042 IV.I‐36

September 2011 IV.I. Noise b. Operation

Operation impacts at off‐site receptors would be less than significant. Therefore, no mitigation measures are required for building operations.

6. LEVEL OF SIGNIFICANCE AFTER MITIGATION a. Construction

Mitigation Measure I‐1 would preclude construction noise impacts from occurring during the noise‐sensitive nighttime periods, or weekends. Mitigation Measure I‐2 would avoid the noise impacts associated with construction activities that might otherwise occur off‐site in the vicinity of sensitive uses. Mitigation Measure I‐4 would specifically lessen project impacts during critical school activities; and would generally result in a lower overall noise profile due to construction activities. However, the significance thresholds would still be exceeded during times of more intense construction activity. Thus, short‐term construction noise impacts would be significant and unavoidable.

Mitigation Measure I‐3 would reduce vibration impacts at nearby residential development to levels that would be less than significant. Implementation of Mitigation Measures I‐4 and I‐5 would reduce potentially significant vibration impacts through modification of construction activities. As the vibration analysis is extremely conservative, representing atypical maximum events, and the mitigation measures would allow impacts to be reduced, it is expected that potential vibration impacts at the Science and Technology Center would be extremely limited. Notwithstanding, since the significance thresholds may be exceeded on occasion, it is conservatively concluded that impacts would be significant and unavoidable. b. Operation

The projects noise impacts to off‐site sensitive uses during project operation are less than significant. No mitigation measures are required.

City of Los Angeles 10000 Santa Monica Boulevard PCR Services Corporation/SCH No. 2011041042 IV.I‐37