The project meets other program goals to provide housing in proximity to employment, public facilities and transportation. Where such analyses are available they may be used to assess sites subject to the requirements of this standard. The day-night average sound level may be estimated from the design hour L10 or Leq values by the following relationships, provided heavy trucks do not exceed 10 percent of the total traffic flow in vehicles per 24 hours and the traffic flow between 10 p. Average sound level, in decibels, is the level of the mean-square A-weighted sound pressure during the stated time period, with reference to the square of the standard reference sound pressure of 20 micropascals. To the extent possible, noise exposure shall be projected to be representative of conditions that are expected to exist at a time at least 10 years beyond the date of the project or action under review. Measures that reduce external noise at a site shall be used wherever practicable in preference to the incorporation of additional noise attenuation in buildings.
Where it is determined that noise measurements are required, such measurements will be conducted in accordance with methods and measurement criteria established by the Department. A loud impulsive sound is defined for the purpose of this regulation as one for which: These requirements are hereby modified for all projects proposed in the Normally Unacceptable and Unacceptable noise exposure zones as follows: For other areawide acoustical data, review is required only where existing areawide data are being utilized and where such data have been changed to reflect changes in the measurement methodology or underlying noise source assumptions. Where such analyses are available they may be used to assess sites subject to the requirements of this standard. The above factors shall be documented and made part of the project file. The project meets other program goals to provide housing in proximity to employment, public facilities and transportation. Flexibility for non-acoustic benefits. Actions on proposed projects shall not be undertaken while new areawide noise data are being considered for HUD use except where the proposed location is affected in the same manner under both the old and new noise data. Noise analyses for these facilities sometimes encompass sites that may be subject to the requirements of this standard. Compliance with the standards contained in Sec. In many instances the noise environment will vary across a site, with portions of the site being in an Acceptable noise environment and other portions in a Normally Unacceptable noise environment. Approvals in Normally Unacceptable Noise Zones require a minimum of 5 decibels additional sound attenuation for buildings having noise-sensitive uses if the day-night average sound level is greater than 65 decibels but does not exceed 70 decibels, or a minimum of 10 decibels of additional sound attenuation if the day-night average sound level is greater than 70 decibels but does not exceed 75 decibels. Attenuation measures to be submitted to the Assistant Secretary for CPD for approval on a case-by-case basis. The project does not require an Environmental Impact Statement under provisions of Sec. Measures that reduce external noise at a site shall be used wherever practicable in preference to the incorporation of additional noise attenuation in buildings. When an EIS is required, the concurrence of the Program Assistant Secretary is also required before a project can be approved. Day-night average sound level, abbreviated as DNL, and symbolized mathematically as Ldn is defined as: Impact on existing and prospective urbanized areas and on development activity. Use of areawide acoustical data. The maximum sound level obtained with fast averaging time of a sound level meter exceeds the maximum value obtained with slow averaging time by at least 4 decibels. Use of available data. When loud impulsive sounds such as sonic booms or explosions are anticipated contributors to the noise environment at a site, the contribution to day-night average sound level produced by the loud impulsive sounds shall have 8 decibels added to it in assessing the acceptability of a site. Highway projects receiving Federal aid are subject to noise analyses under the procedures of the Federal Highway Administration. To the extent possible, noise exposure shall be projected to be representative of conditions that are expected to exist at a time at least 10 years beyond the date of the project or action under review.
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