Wilson, Ihrig & Associates, Inc. (WIA) has the experience, capabilities, and instrumentation to conduct environmental impact studies and to help communities solve their acoustical problems in the most practical and cost effective manner.

We have worked closely with federal, state, and local government agencies as well as with the sources of community noise, such as airports, transit systems, factories, and power plants. We have the specialized knowledge required to assess the effects of noise and vibration and can make careful studies of legal and economical aspects before recommending noise control features.

Representative Services

Noise Surveys Performing 24-hour or short sample noise surveys to document the existing noise environment in terms of Ldn, CNEL, Leq, L10, or any other required descriptor.
Environmental Impact Statements Preparing the acoustical sections of environmental impact statements.
Acoustical Compliance Determining compliance with the California Noise Insulation Standards (Title 24), as well as with ordinances or specific acoustical requirements established by local jurisdictions.
Noise Prediction Estimating existing noise levels and predicting future noise levels using mathematical and empirical modeling techniques.
Noise Intrusion Designing structures to achieve appropriate insulation of interior spaces from exterior noise sources.
Noise Control Designing sound barrier walls to reduce community noise levels due to transportation noise sources including automobiles, trucks, buses, and transit vehicles. Designing noise reduction methods for specific community noise sources such as refineries, manufacturing facilities, and mechanical and construction equipment.
City/County Noise Elements and Ordinances Preparing noise elements of city or county general plans. Assisting governmental agencies in drafting noise ordinances and regulations.