As part of the settlement agreement between Los Angeles International Airport (LAX) and Lennox School District, LAX is providing funding to sound mitigate one pre-school, five elementary schools, one middle school, and three high schools impacted by aircraft noise. CSDA was contracted to provide design solutions for one middle school and two elementary schools.

CSDA provided the acoustical testing, architectural design and construction administration services to acoustically treat Lennox Middle School, Jefferson Elementary School and Buford Elementary School to reduce interior noise levels to meet the 45dB standard. The Lennox Middle School project encompasses seven buildings including 45 classrooms (43,237sf) and a gymnasium (9,011sf). The Jefferson Elementary School project includes three buildings, including 25 classrooms (15,028sf). The Buford Elementary School includes 30 classrooms, two staff prep rooms, two offices, and one library (31,100sf).

Acoustical remedies are being made to the exterior and interior of the buildings. Exterior remedies include treating the exterior walls with sound insulation and installing sound abatement devices on rooftop HVAC units. Interior modifications to classrooms include the installation of sound proof windows and doors. Interior modifications to classrooms include the installation of new sound absorbent ceiling tiles and panels. Since construction is occurring while the school is in session, six temporary classrooms have been set up to allow phased construction of six classrooms simultaneously.


CSDA was selected for the Airport Cooperative Research Program (ACRP) study 02-51 to evaluate methods for determining interior noise levels used in airport sound insulation programs nationwide. Our team of expert researchers is evaluating acoustical measurement methods employed in FAA-sponsored airport sound insulation programs, including: aircraft flyover, elevated exterior loudspeaker, ground level exterior loudspeaker, indoor loudspeaker and sound intensity.

The objectives of this research are to: (1) identify and evaluate the accuracy of noise level reduction (NLR) measurement methods; (2) propose procedures to minimize the measurement inaccuracies of each method; and (3) develop a matrix to help program sponsors identify the most appropriate methodology for determining interior noise levels for their airport sound insulation program.

CSDA is working with the following consultants on this study:

  • Dr. Paul Schomer, PE – Schomer and Associates
  • John Freytag, PE – Freytag & Associates, LLC
  • Herbert Singleton, PE – Cross-Spectrum Acoustics LLC



Impacted by aircraft noise from nearby San Francisco International Airport, acoustical treatments were made to more than 6,600 single- and multi-family homes, three churches, one school and a convent to reduce interior noise levels. Program management, design, community outreach and construction administration services were provided. Instrumental to the program’s success was the development and implementation of a Community Outreach Program and Showcase Home to stimulate homeowner participation in the program. Completed in accordance with a client-driven accelerated schedule, approximately 1,400 homes were acoustically treated each year over a three-year period.


Beginning with a pilot program, design services are being provided in partnership with Stelling Engineers to provide a wide range of acoustical modifications to approximately 340 homes impacted by aircraft noise from nearby Great Falls International Airport. Typical acoustical modifications include replacement of windows and doors, storm door installations, new central air conditioning where none exists, insulation of attics and wall voids and replacement of existing heating systems.


Architectural design, community outreach, construction administration and sub-consultant management (i.e., mechanical/electrical, acoustical testing and hazmat) services were provided to acoustically modify more than 2,700 single- and multi-family homes impacted by aircraft noise from Los Angeles International Airport (LAX) and Van Nuys Airport.