Marine Corps policy and responsibilities for compliance with statutory requirements for reducing environmental noise at Marine Corps installations are described in Chapter 13 of MCO P5090.2A. Noise levels in contours around a noise source are usually shown as Ldn (Mathematical numerical rating for the Day-Night Average Sound Level). Usually an Ldn up to 65 is compatible for all land uses and Ldn's above 85 are not compatible for most land uses.
Incorporation of noise attenuation into the design and construction of a structure may be required to mitigate noise between these two Ldn levels.
Air Installation Compatible Use Zones (AICUZ)
AICUZ are areas of land surrounding an air facility requiring special concern as to the type of land use desired to promote the health, safety and welfare of the community without deteriorating the mission capability of the air facility. No off-Base communities are affected by noise levels surrounding the air facility. Maps showing structures within Ldn AICUZ contours for the Marine Corps Air Facility from a 1991/92 study are available at NREA Branch, Facilities Division.
Range Compatible Use Zone (RCUZ)
RCUZ refers to noise and safety hazards generated from training activities conducted on the ranges. Noise on ranges can be due to artillery operations, demolition charges, small arms firing and aircraft operations. No occupied structures either on Base or off-Base that was not directly involved in live-fire on ranges were found to be at a noise level that would pose a hazard to human health, safety or welfare. Also, vibration levels measured on the ranges near the Base property line did not indicate ground-borne vibration levels that would be harmful to buildings. A Noise Zone Compatibility Summary pamphlet of September 1997 can be obtained from the NREA Branch, Facilities Division.