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City of Santa Ana - Park View at Town and Country Manor <br />Draft EIR <br />4.5.3 - Regulatory Setting <br />State Regulatory Agencies <br />Office of Noise Control Standards <br />Noise <br />The California Office of Noise Control has set the land use compatibility noise standards and <br />encouraged local jurisdictions to adopt them. Pursuant to the land use compatibility noise standards, <br />for commercial and industrial uses, noise levels up to 65 dBA CNEL are normally acceptable; noise <br />levels between 65 and 75 dBA CNEL are "conditionally acceptable," which means that noise levels <br />are acceptable only when a detailed noise analysis is conducted and needed noise insulation features <br />are included in the design. Conventional construction with closed windows and a fresh air supply <br />system or air conditioning will normally suffice as "acceptable noise insulation" features. Noise <br />levels between 70 and 80 dBA CNEL are generally unacceptable, and development of land uses in <br />noise environments that exceed 75 dBA CNEL are discouraged. For residential development and <br />schools, exterior noise levels ranging up to 60 dBA CNEL are classified as "normally acceptable," <br />based upon the assumption that the homes are built with normal conventional construction. Noise <br />levels ranging up to 70 dBA CNEL are conditionally acceptable. Noise levels in the 70- to 75 -dBA <br />CNEL range are classified as "generally unacceptable," and new construction or development is <br />discouraged but may proceed if a detailed noise analysis is conducted and needed noise insulation <br />features are included in the design. <br />Caltrans Vibration Guidance <br />Construction vibration is regulated in accordance with standards established by the California <br />Department of Transportation ( Caltrans) in their Transportation - and Construction- Induced Vibration <br />Guidance Manual (2004). Table 4.5 -4 presents these standards. Transient sources create a single <br />isolated vibration event, such as blasting or drop ball impacts. Continuous /frequent intermittent <br />sources include multiple impacts from pile drivers, the use of vibratory compaction equipment, and <br />other construction equipment that creates vibration other than in single events. <br />Table 4.5.4: Groundborne Vibration Exposure Standards <br />Structure and Condition <br />Maximum Peak Particle Velocity <br />(inches /second) <br />Transient Continuous /Frequent <br />Sources Intermittent Sources <br />Extremely fragile historic building, ruins, ancient monuments <br />0.12 <br />0.08 <br />Older residential structures with plaster walls /ceilings <br />0.50 <br />0.30 <br />New residential structures with gypsum board walls/ceilings <br />1.00 <br />0.50 <br />Modem industrial/commercial buildings <br />2.00 <br />0.50 <br />Strongly perceptible <br />0.90 <br />0.10 <br />Source: California Department of Transportation, 2004. <br />Michael Brandman Associates 4.5 -7 <br />H\Cl t (PN JN)b327b327W3MME 3270030 Sec0 Noi�.doc <br />