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75D - PH ZONING ORD AND CUP CALIFORNIA PALMS
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75D - PH ZONING ORD AND CUP CALIFORNIA PALMS
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1/3/2012 4:38:52 PM
Creation date
7/11/2007 1:42:24 PM
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City Clerk
Doc Type
Agenda Packet
Item #
75D
Date
7/16/2007
Destruction Year
2012
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3.0 STANDARDS OF SIGNIFICANCE <br />The applicable noise standards governing the project site aze the City of Santa. Auer Noise Standards. The City of <br />Santa Ana Land Use Guidelines, included in Table 2, are to be used in siting new land uses. The project includes <br />the conversion of a motel to a transiem/residervial hotel land use.' The City's Noise Eh:ment of the General Pfau <br />sets a "desirable maximtnn" noise level of 65 dBA for high density residervial and a "maximum acceptable" <br />exterior noise level of 70 dBA CNEL. These levels are to be used to assess impacts to habitable exterior spaces. <br />These exterior levels may be exceeded for non-habitable exterior areas so long as the iuterior noise levels do nm <br />exceed the State's 45 dBA CNEL irverior standard. <br />Additionally, the project would generate vehicle trips that are added to the local roadway network and the inclusion <br />of these vehicles could raise traffic noise levels through the adjoining area Mobile-source noise (i.e., vehicle <br />noise) is preempted from local reguhttion but is still subject to CEQA, With respect to noise increase, these noise <br />impacts can be broken down into three categories. The fast is "audrble" impacts, which refers to increases in noise <br />level that are perceptible to humans. Audible increases in noise levels generally refer to a change of 3 dBA or more <br />since this level has bcen found to be bazely perceptible in exterior environments. The second category, "potentially <br />audible," refers to a change in noise level between 1 and 3 dBA: This range of noise levels was found to be <br />noticeable to sensitive people in laboratory enviromnervs. The lost category includes changes in noise level of less <br />than 1 d$A that are typically "inaudible" to the human ear except under quiet conditions in controlled <br />environments. Only "audible" changes in noise level aze considered potentially significant. <br />Finally, the City has no published standards for vibration. As such, this analysis defers to the vibration standards <br />published by Cahrans. Cahrans sets their minimum criterion for significant vibration impact at 0.2 inches per <br />second. ('Ile maximum oriterion is set at 2 inches per second.) <br />4.0 IMPACT ANALYSIS <br />For ease of the reader, the preserved impact analysis follows the format included in the Initial Study Checklist for <br />Mitigated Negative Declarations for the preparation of noise impacts as specified under the California <br />Environmental Quality Act (CEQA). The Checklist asks if the project would resuh in the: <br />a) Exposure of persons to or generation of noise levels in excexs of standards established in the local <br />general plan or noise ordinance, or applicable standards oj'otlrer'agencresY <br />The City of Santa Ana Noise Elemerv sets the maximum acceptable high density residential outdoor living area <br />noise standard at 70 dBA CNEL and recognizes the State's interior standard of 45 dBA CNEL. These values are to <br />be used in the siting of new land uses. <br />Habitable Exterior Areas <br />Less than Sign cant Impact. An impact would be significant if the project were to site a sensitive use in an area <br />that is already exposed to excessive noise. As noted, the City of Santa Ana band Use Guidelines, included in Table <br />2, aze to be used in siting new land uses. The project includes the conversion of a motel to a transierv/tesidervial <br />hotel. The use would be considered as a high density residential use and the City sets a maximum limitation of 70 <br />dBA CNF,L for habitable exterior spaces. <br />As noted in the field study, the most prevalerv source of noise at the project site is from traffic traveling along <br />Harbor Boulevard. Noise reading obtained in fire California Palms habitable exterior azeas, (i.e., the two pool <br />areas) showed noise levels of 56.5 and 56.0 dBA, both obtained during the 11:00 a.m. hour. <br />The EMFAC2002 model estimates that traffic during the 1 I:00 a.m. hour comprises approximately 5.92 percerv of <br />the ADT. The CNEL is then calculated to be approximately 2.1 dBA louder than noise generated during the 11:00 <br />a,m. hour. This would then infer a CNEL of about 58 to 59 dBA (i.e., 56.5 dBA + 2.1 dBA) in these habitable <br />areas. <br />12 <br />75D-132 <br />
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