31B - CUP - 1901 NORTH FAIRVIEW ST

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Clty of Santa Ana Environmental Checklist project construction activities. Construction noise levels would be slightly lower, but similar to the existing noise levels currently experienced at receivers to the west of the project site across Fairview Street, based on noise measurements taken at sensitive receiver ST -1 (69 dBA LeQ). As provided above, the City's noise ordinance exempts construction activities from the noise standard (providing that such activities take place between the hours of 7:00 a.m. to 8 :00 p.m. on weekdays and Saturdays). The construction activities of the proposed project would not exceed the City's permitted construction hours. However, the short -term noise from construction would be loud at times at the nearby noise- sensitive land uses, and although temporary, could be disruptive. Therefore, Mitigation Measure N0I -1, which requires implementation of noise control measures, is provided to reduce construction noise levels to a less -than- significant level. Mitigation Measure NOT -1: To reduce construction noise generated by the proposed project, the City will ensure that the contractor will implement the following measures: • All mobile or fixed noise- producing equipment used on the project that is regulated for noise output by a local, state, or federal agency will comply with such regulation while in the course of project activity. • Electrically powered equipment will be used instead of pneumatic or internal combustion powered equipment, where feasible. • Material stockpiles and mobile equipment staging, parking, and maintenance areas will be located as far as practicable from noise - sensitive receivers. • The use of noise- producing signals, including horns, whistles, alarms, and bells, will be for safety warning purposes only. • The onsite construction supervisor will have the responsibility and authority to receive and resolve noise complaints. A clear appeal process to the City will be established prior to construction commencement that will allow for resolution of noise problems that cannot be immediately solved by the site supervisor. • Construction signs will be posted at the project site identifying a contact name and phone number to register noise complaints. Operation Traffic (Offsite Land Uses) Project - Related Traffic Noise. The project Traffic Impact Analysis (TIA) prepared by Felir & Peers (Appendix C) was used to determine potential traffic impacts from the proposed project. The TIA evaluated operational traffic impacts broken down by phase of the proposed school on the surrounding land uses. Traffic noise levels were analyzed using the FHWA's Traffic Noise Model (TNM). This model analyzes traffic noise based on number of vehicles, traffic mix (automobiles, medium trucks, and heavy trucks), project site geometry with respect to roadways, shielding from structures such as walls or buildings, and other parameters. The most recent version of TNM (version 2.5) was used in this analysis. Using the TIA's estimated peak -hour traffic volumes, TNM calculates noise levels in terms of the peak hour Leq noise level for modeled receivers. To determine the corresponding CNEL, the peak hour noise levels were input into an Excel spreadsheet which models diurnal traffic patterns. Table 3 -17 provides the modeled dBA CNEL noise levels for modeled receivers for existing, existing plus project, Phase I, existing plus project Phase 11, opening year (2013), opening year (2013) plus Phase I, opening year (2019), and opening year (2019) plus Phase If scenarios. ;C r,Lauerny Lna Ile r rngn xnooi June 2012 Initial Study /Mitigated Negative Declaration 3 -75 ICF 00914.11 31 B -153