TagRegulations(16)

Washington State Department of Ecology publication (No. 97-112, April 1998), authored by Andy McMillan of the Shorelands & Environmental Assistance Program. Introduces regulatory authority over wetlands, wetland definitions and delineation, wetland characterization and function assessment, wetland mitigation, and buffers. Covers Washington State wetland regulation under state law, published by Ecology’s Shorelands & Environmental Assistance Program,

WAC 246-366-110 sets sound control standards for Washington State school classrooms, requiring that background noise in new construction not exceed NC-35 on the noise criterion curve, with actual noise levels capped at 45 dBA during normal operation. Industrial and vocational classrooms have separate limits, with ambient noise not to exceed 65 dBA when exhaust systems are running. In music and vocational education areas, student noise exposure is strictly regulated by duration, and hearing protection must be provided if exposure limits are exceeded.

Army Corps of Engineers Regulatory Guidance Letter 87-03, dated April 14, 1987, clarifying requirements for Section 401 water quality certification under the Clean Water Act. Covers when certification or waiver is required before Federal permit issuance, the effect of state denial or court voidance before and after permit issuance, and the ‘reasonable period of time’

Washington State law (WAC 173-60-040) sets maximum allowable noise levels based on the zoning class of both the noise source and the receiving property, ranging from 55 to 70 dBA, with nighttime limits reduced by 10 dBA for residential areas between 10 p.m. and 7 a.m. Short-duration noise spikes are permitted, allowing up to 15 dBA above the limit for no more than 1.5 minutes per hour. Enforcement is complaint-driven, measured at the receiving property, and each 24-hour period of violation counts as a separate offense under RCW 70.107.050.

This 1971 report, prepared by Wyle Laboratories for the California Department of Aeronautics, provides the technical supporting information behind California's adopted noise regulations for airports. It documents the research and methodology used to establish noise standards governing aircraft operations at California airports. While focused on California, the report represents an early example of state-level regulatory efforts to address airport noise impacts on surrounding communities.