Laserfiche WebLink
B PCompatibilitlFactorsf EvaluatedtinnALUCPst <br /> 9.A. - Page 125 <br /> the discretion of each individual airport proprietor. Regulations implementing the act are set forth <br /> in Part 150 of the Federal Aviation Regulations (FAR). <br /> FAAIRegulationslandhPoliciesv <br /> As a means of implementing ASNA,the FAA adopted 14 CFR Part 150,Airport Noise <br /> Compatibility Planning(FAR Part 150). FAR Part 150 establishes a voluntary program that <br /> airport operators can utilize to conduct airport noise compatibility planning. FAR Part 150 also <br /> prescribes a system for measuring airport noise impacts and presents guidelines for identifying <br /> incompatible land uses. Airports operator that participate in the FAR Part 150 program are <br /> eligible to receive federal funding for both for the study itself and for implementation of approved <br /> components of the airport's noise compatibility program. <br /> The FAA has adopted day-night average sound level(DNL)as the noise metric for measuring <br /> cumulative aircraft noise under FAR Part 150. DNL, formerly referred to as Ldn,is expressed in <br /> dBA and represents the noise level over a 24-hour period. In the calculation of DNL, for each <br /> hour during the nighttime period(10:00 p.m. to 6:59 a.m.),the sound levels are increased by a 10 <br /> decibel-weighting penalty(equivalent to a 10 fold increase in aircraft operations)before the 24 <br /> hour value is computed. The weighting penalty accounts for the more intrusive nature of noise <br /> during the nighttime hours. <br /> Suggested compatibility guidelines for evaluating land uses in aircraft noise exposure areas have <br /> been developed by the FAA and are presented in Table 1 of FAR Part 150(See ExhibitdB-1). <br /> Compatible or incompatible land use is determined by comparing the predicted or measured day- <br /> night average sound level(DNL)at a site with the DNLs in the table. As shown on Exhibit B-1, <br /> virtually all land uses are considered to be compatible with aircraft noise levels below DNL 65 <br /> dB. It is important to note that the FAA does allow local land use planning agencies to adopt a <br /> lower compatibility level that may be more stringent than the FAR Part 150 guidelines. <br /> StatewfvCalifornialLaws,NRegulationsmndvGuidelinesv <br /> Public Utilities Code(PUC) Section 21669 requires Caltrans to adopt—to the extent not <br /> prohibited by federal law—noise standards applicable to all airports operating under a state <br /> permit. The airport noise standards promulgated in accordance with PUC Section 21669 are set <br /> forth in Section 5000 et seq. of the California Code of Regulations (Title 21,Division 2.5, <br /> Chapter 6). The current version of the regulations became effective in March 1990. <br /> In Section 5006,the regulations state that: <br /> "The level of noise acceptable to a reasonable person residing in the vicinity of <br /> an airport is established as a community noise equivalent level(CNEL)value of <br /> 65 dB for purposes of these regulations. This criterion level has been chosen for <br /> reasonable persons residing in urban residential areas where houses are of typical <br /> California construction and may have windows partially open. It has been <br /> selected with reference to speech, sleep and community reaction." <br /> SanfCarlosfAirportV B-2 ESAfAirportsfl130753f <br /> ALUCPf W hitef Pape/ Junef2014f <br />