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Appendix H <br /> range as 55-70 dB. The normally acceptable range for high-density residential <br /> uses is identified as Ldn values below 65 dB, and the conditionally acceptable <br /> range is identified as 60-70 dB. For educational and medical facilities,Ldn <br /> values below 70 dB are considered normally acceptable and Ld„values of 60-70 <br /> dB are considered conditionally acceptable. For office and commercial land <br /> uses,Ldn values below 70 dB are considered normally acceptable and Ldo values <br /> of 67.5-77.5 are categorized as conditionally acceptable. <br /> These overlapping Ldn ranges are intended to indicate that local conditions <br /> (existing sound levels and community attitudes toward dominant sound sources) <br /> should be considered in evaluating land use compatibility at specific locations. <br /> The California Department of Housing and Community Development has <br /> adopted noise insulation performance standards for new hotels,motels, and <br /> dwellings other than detached single-family structures(24 CCR T25-28). These <br /> standards require that"interior CNELs with windows closed, attributable to <br /> exterior sources, shall not exceed an annual CNEL of 45 dB in any habitable <br /> room." <br /> The California Department of Transportation uses the FHWA criteria as the basis <br /> for evaluating noise impacts from highway projects. <br /> Reference <br /> Hoover, R. M., and R. H. Keith. 1996. Noise control for buildings and <br /> manufacturing plants. Hoover and Keith, Inc. Houston, TX. <br /> H-8 <br />