Acentech provided a wide range of on-call noise and vibration services for the Los Angeles County Metropolitan Transit Authority (LA Metro). Our staff completed the following tasks for the Orange Line Bus Rapid Transit (BRT) project.

• Reviewed construction contractor noise and vibration submittals for LA Metro Orange Line construction activity.
• Performed spot checks of noise and vibration levels during daytime and nighttime construction to address local homeowners’ concerns.
• To keep construction on schedule, analyzed three multiple route rapid bus alternatives in a 9-week timeframe for the Revised Final Environmental Impact Report: Enhanced Transportation Systems Management (87.1 miles) Three East-West Rapid Bus (46.5 miles) Five East-West Rapid Bus Routes (49.1 miles)
• Used the Federal Highway Administration (FHWA) Traffic Noise Model (TNM), to establish existing background noise levels and the mitigated Orange Line operation noise at 902 residential locations. Thus assured comprehensive analyses of potential noise impacts.
• Measured bus noise emission levels of the newer bus in accordance with FHWA protocol for input into the TNM to establish noise emission.
• Assessed residual noise impacts through modeling and measurement of bus operation noise levels to determine eligible residences for potential sound insulation program.
• Prepared sound insulation recommendations to meet interior noise level requirement.