Project History

Examples of our work include:

Pipeline Construction Noise Monitoring, La Mesa, CA
Our work required monitoring noise levels during nighttime construction work. The monitoring equipment was set up to record audio to enable us to distinguish between ambient sources and construction activities. Daily reports were supplied, which included an assessment relative to the City's standards.

Bus Maintenance Facilities OSHA Noise Testing, Riverside, CA
Noise levels at two Riverside County Transit maintenance facilities were assessed. The testing was performed with noise dosimeters and hand-held sound level meters to determine compliance with OSHA's noise limits. Recommendations were provided to reduce noise levels at areas where workers could be exposed to noise levels in excess of 85 dBA.

Hydro-acoustic Noise Monitoring, Huntington Beach, CA
Due to the presence of marine mammals and an endangered species of sea turtle near a bridge construction site, we monitored underwater noise levels to help minimize noise impacts. We worked with a marine biology company to monitor noise for each day of pile driving at the site. We were able to advise the construction supervisors on mitigation measures, such as reducing impact energy and the effectiveness of underwater bubble curtains.

Mixed Use Development, Glendale, CA
Our work involved producing a noise study for a residential and commercial mixed use development. We predicted future noise levels based on estimated traffic volumes and speed, and calculated the required window and door STC ratings to achieve the required interior noise limits.

Los Angeles International Airport Terminal Construction Vibration Monitoring
We were contracted by two construction companies to monitor vibration during shoring installation at the new Tom Bradley International Terminal at LAX Airport. Daily vibration monitoring reports were provided to the contractors for several months during construction.

Beverage Can Manufacturing Plant, Denver, CO
Our staff conducted an assessment of noise levels inside an aluminum can factory. We determined locations where noise levels were excessive and proposed noise-reduction solutions. These included upgrades to walls separating the factory from office areas, equipment barriers and acoustical panels.

Grade Separation Shoring Installation Monitoring, Fremont, CA
For this grade separation project, the close proximity of residences to the railroad crossing meant that vibration monitoring was critical during shoring installation. We produced a vibration monitoring plan prior to construction, which involved predicting where vibration limit exceedances were most likely to occur when the ABI machine was operational. Monitoring was performed at multiple locations simultaneously during construction.

Pile Driving Monitoring, San Jose, CA
We monitored vibration along a section of a new path that was constructed along a creek next to commercial buildings, a military base and a residential area. Pre-construction vibration readings were made at 20 locations along the route before construction to determine existing vibration levels. Daily monitoring reports were produced during the pile driving operation.

Restaurant Fan Vibration Testing, Alhambra, CA
An extractor fan for a restaurant kitchen was causing vibration problems within a nearby residential unit. We performed vibration measurements before and after isolation mounts were fitted to the equipment to quantify the reduction achieved. Vibration data was assessed against generally accepted human perception vibration criteria for residential structures.

Server Equipment Room, San Diego, CA
Large refrigeration units were causing excessive vibration in a room containing server equipment. Using seismic accelerometers, we were able to identify which refrigeration units were at fault and provide vibration mitigation recommendations.

Railroad Vibration Assessment, Orange, CA
We measured vibration levels during train passbys at a proposed residential development next to a railroad. Measurements were made to Federal Transit Administration (FTA) standards.

Laboratory Vibration Measurements, Tampa, FL
We performed seismic vibration measurements at a site for a proposed laboratory designed to contain equipment highly sensitive to ground movement. The project involved vibration level and spectral analysis of the vibration signals.

Noise Insulation Class (NIC) and Field Impact Insulation Class (FIIC) Testing, CA
Our work has involved numerous building acoustic measurements for new and existing residential units. We have certified new residential developments for compliance with the California Administrative Code Title 24 sound transmission standards, in addition to assessing compliance after the installation of new flooring in existing units.