METRO TRANSIT PURPLE LINE EXTENSION PHASES 1 – 3

CSDA is working with Kleinfelder and Metro as the acoustical engineer for the construction of all three phases of the Purple Line extension. CSDA is assisting with the construction noise and vibration analysis, reviewing the Contractor’s submittals and mitigation measures, conducting noise and vibration measurements, and preparing monthly noise compliance reports. Our scope includes:

• Review of contractor RFI’s and submittals with respect to construction noise and vibration
• Review of contractor’s noise and vibration monitoring plans and reports
• Preparation of monthly noise monitoring reports for submission to the City of Los Angeles and Beverly Hills monitoring conducted by Metro/TRC
• Site-specific construction noise and vibration analysis (e.g., Saban Theatre)
• Ambient noise monitoring at sensitive receivers
• Data analysis
• Design of construction mitigation measures

Continuing from the current terminus of the Metro Purple Line at Wilshire/Western, the Purple Line Extension will be completely underground and extend westward for about nine miles along Wilshire Boulevard with seven new stations. It will provide a highcapacity, high-speed, dependable alternative for those traveling to and from LA’s “second downtown,” including destinations such as Miracle Mile, Beverly Hills, Century City, and Westwood.

RONALD REAGAN WASHINGTON NATIONAL AIRPORT – PHASES I and II

Phase I – As a consultant to Freytag & Associates, we performed an airplane noise assessment for the District of Columbia focused on noise impacts from changes to flight paths made out Ronald Reagan Washington National Airport (DCA). There were two major parts to the project. The first consisted of a thorough review and documentation of existing data supplemented by new investigations to document the past and current airplane noise environment over the D.C. area. Second, the team worked to develop revised air traffic procedures, acceptable to the FAA, to minimize the current noise impact over the affected areas in D.C. The overall purpose of the project was to determine what, if any, noise impacts have occurred in the District as a result of the FAA’s implementation of NextGen air traffic control procedures and routes. Finally, we identified potential flight path/route changes and other airspace modifications to reduce flyover noise in the District.

Phase II – This phase built on the previous Phase I study. Utilizing the measurement data collected in Phase I, the consultant team computed various supplemental noise metrics (Lmax, Leq, Time Above Level, etc.) to further quantify noise impacts and changes in aircraft noise due to arrivals and departures at Ronald Reagan Washington National Airport (DCA). Additional long-term field measurements were conducted and the consultant team quantified the community impacts (e.g., sleep disturbance, speech interference) according to national standards. Additionally, we identified and encouraged improvements and changes to existing noise abatement procedures and practices to reduce aircraft noise impact over the District. Specific noise mitigation recommendations were developed for presentation to airport management, the Metropolitan Washington Airport Authority (MWAA), and to the Federal Aviation Administration (FAA). The primary beneficiary of this project is the District residents, as the goal of the project is to reduce DCA aircraft noise impacts and improve residents’ quality of life through aircraft noise reduction.

1919 MARKET STREET

CSDA was retained to provide acoustical consulting for the 1919 Market Street project in Oakland, California. We provided acoustical recommendations for the project to meet City and State code requirements. The project consists of the conversion of an existing two-story industrial building to live-work flats and town-homes as well as the new construction of a four-story residential  building. Our acoustical consulting includes schematic design review, design development review, construction document review, bidding/permit phase assistance and construction administration support, as well as preparation of a construction noise and vibration control plan.

5959 W. CENTURY BLVD (HYATT HOUSE)

CSDA is providing full acoustical design services including exterior noise intrusion analysis, interior sound isolation, and MEP noise and vibration control for this project. This site is located in the flight path of the Los Angeles International Airport, therefore aircraft noise intrusion is a significant concern. This project is converting an existing commercial office building to a 400-key dual branded Hyatt House select service hotel.

88 BROADWAY/735 DAVIS

CSDA was retained to provide acoustical consulting services for the 88 Broadway/735 Davis Street project in San Francisco. We provided acoustical recommendations for the project to meet City and State Code requirements. The project consists of two buildings containing 189 residential units, ground floor retail spaces, rooftop amenity spaces, and a childcare center. The project includes both affordable and senior housing components. Our acoustical consulting included the preparation of an environmental noise study, schematic design review, design development review, construction document review, bidding/permit phase assistance, and construction administration support.