CSDA is conducting sound monitoring services as part of a four-year contract with
the County of Los Angeles Department of Regional Planning. The project involves
quarterly monitoring activities that occur at six off-site, public locations around the
perimeter of Universal Studios, as determined by the Los Angeles County Specific Plan.
Monitoring activities occur concurrently over 24-hour periods. As requested, CSDA
also performs additional sound monitoring studies for outdoor special events with
more than 250 attendees that include amplified sound. In addition, we document the
monitoring process through each step of execution and provide presentations and
written reports for each monitoring event.

CSDA is registered with the GAIN/GROW work program through which we are
hiring and training qualified individuals to supplement our internal staff. With our
participation in the GAIN/GROW hiring program, we have been able to provide
employment opportunities to County residents, teach them new vocational skills, and
help them to improve their future job prospects. The trained GAIN/GROW staff assist
our team with the on-site measurements and note the time and cause of any events
above the Specific Plan noise limits.


As a part of a planned data center expansion in urban, downtown San Francisco, an analysis was made of the noise generated by the center’s rooftop equipment and its impact on neighboring properties. Project challenges included the center’s location adjacent to several sensitive receivers including residential buildings with operable windows. Noise emissions were analyzed and mitigation measures were recommended to meet the City of San Francisco’s noise ordinance standards and to reduce noise from existing and future data center equipment.


CSDA was retained to assist with the master planning and entitlement process for the expansion of Digital Realty’s 360 Spear Street data center. The data center is located in downtown San Francisco, next to residences and other businesses. We performed measurements of the ambient noise environment and calculated the noise from emergency generators, HVAC equipment, and other project mechanical equipment. A three-dimensional noise model was used to perform the calculations so that site-specific conditions such as reflected noise from the adjacent buildings could be analyzed.


A noise analysis was conducted to determine the impacts resulting from the conversion of a United States Postal Service distribution facility into a San Francisco Municipal Transportation Agency (MTA) auto impound lot. Using the Federal Highway Administration’s Traffic Noise Model, projected noise levels were calculated for vehicles being towed to/from the site, as well as noise from weekly auto auctions of impounded vehicles and their impact on adjacent residences. Calculation results were compared to the Daly City General Plan Noise Element to determine if the proposed facility complied with the applicable standards.


CSDA conducted an environmental noise study for Stanford’s University Hospital helipad. In order to renovate the elevator that serves the rooftop helipad at Stanford University Hospital, it was necessary to temporarily relocate the helipad to a soccer field on the University Campus. Since homeowners living adjacent to the campus voiced concerns that helicopter noise would negatively impact their quality of life, noise modeling was conducted to determine the expected helicopter noise and its impact. Using the Federal Aviation Administration’s (FAA) Integrated Noise Model (INM), graphic noise contours were produced to aid the University, City of Palo Alto and affected homeowners in understanding the expected noise impacts.