31B - CUP - 1901 NORTH FAIRVIEW ST

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City of Santa Ana Environmental Checklist provided by normal building construction when constructed in areas exposed to greater than 60 dB CNEL" (City of Santa Ana 1982). Table 1 of the City's noise element sets interior and exterior noise limits for Institutional land uses at 45 dBA and 65 dBA CNEL, respectively. Institutional land uses refer to land uses such as hospitals, school classrooms /playgrounds, churches, and libraries. Article IV, Section 18 -314 of the City's Municipal Code specifies permitted hours for construction activities. Noise associated with construction of any real property is exempt provided that it does not occur between the hours of 8 :00 p.m. and 7:00 a.m. on weekdays, including Saturday, or any time on Sunday or a federal holiday (City of Santa Ana 2011). Discussion Would the project; a. Expose persons to orgenerate noise levels in excess of standards established in the local general plan or noise ordinance, at- applicable standards of other agencies? Less - than - Significant Impact with Mitigation Incorporated. Impacts related to construction and operation of the proposed project are discussed separately below. Construction Construction activities related to development of the project would occur in two phases. Construction of Phase I is anticipated to take approximately 13 months and construction of Phase If is anticipated to take 12 months, as described in the Project Description, Construction activities would cause short -term elevated noise levels at the residential land uses to the south and east; and at the St. Edna Subacute & Rehabilitation Center to the north of the proposed project site. As described above and provided in (Table 3 -14), existing noise levels at short -term measurement location ST -5 were approximately 57 dBA Leq, which is representative of noise at sensitive receivers to the north, east, and south. Noise levels at short -term measurement location ST -1 were approximately 69 dBA Leq, which is representative of the existing noise at sensitive receivers to the west of the project site across Fairview Street. Noise generated during construction would be dependent on the types of construction equipment used during construction activity, site geometry (i.e., shielding from intervening terrain or other structures), and the distance between the noise source and receiver. Noise from construction equipment would be audible at sensitive receivers surrounding the project site, the closest of which are immediately north, east, and south of the project site. The anticipated construction noise levels were calculated using the Federal Highway Administration's (FHWA) Roadway Construction Noise Model (RCNM). This model factors in distance from construction noise equipment to receiver, construction vehicle mix, presence or absence of shielding from existing walls, and average daily noise levels to calculate noise levels at residences surrounding the project site. Table 3 -15 shows the noise levels calculated at a distance of 50 feet during construction phases where all pertinent equipment is present and operating. The Academy Charter High School 3 73 Lune 2012 Initial Study /Mitigated Negative Declaration [CF 00914.11 31 B -151