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City of Santa Ana Environmental Checklist The results of the attended short-term sound level measurements are summarized in Table 3-12. As shown, the measured noise levels during daytime homy in and around the project site ranged from 50.1 up to 55.8 A-weighted decibels (dBA) equivalent continuous noise level (Lrq). Table 3-12. Noise Measurement Data Site ID Measurement Location Measurement Period Start Duration Date Time (mm:ss) Noise Sources Noise Measurement Results (dBA) Lrgl Lm„ Lmm Lgo Lso Lro ST-1 Estrillitas 4-17-2012 9:30 15:00 Traffic, Distant S0.1 60.4 41.1 44.4 48.3 53.3 State Aircraft, Distant Preschool- Landscaping, 811 S Sullivan Children Playing, Street Birds ST-2 Bat Nha 4-17-2012 10:00 15:00 Traffic, Distant 51.7 61.4 41.0 45.5 50.0 54.8 Buddhist Aircraft, People Temple 805 S Talking, Birds Sullivan Street ST-3 Villa Del Sol 4.17-2012 10:45 15:00 Traffic, Distant 55.5 65.7 42.6 47.6 53.6 59.0 Apartment Aircraft, Children Complex 800 Playing, Birds Fairview Street ST-42 Bat Nha 4-22-2012 10:15 30:00 Distant Barking 51.9 67.5 43.7 47.0 49.8 54.3 Buddhist 11:16 30:00 Dog. Birds, 55.8 79.6 43.S 48.1 52.1 58.7 Temple 805 S Parking Lot Noise, Sullivan Street Occasional Chanting and Clapping, Occasional Hand Bell, Traffic I The 15-minute duration, energy-averaged noise level (Lrq) is commonly accepted as being representative of a 1-hour average in urban and suburban environments. The 1-hoar Lrq nolse metric Is used as the basis for Community Noise Equivalent Level (CNEL) calculations. 2 For ST-4, two measurements totaling 30 minutes each were conducted during Sunday worship services. Regulatory Background: Noise Standards and Thresholds of Significance The proposed project is subject to the policies and standards contained in the Noise Element of the City of Santa Ana's General Plan and the City's Noise Ordinance. Table i of the City's General Plan Noise Element sets interior and exterior noise limits for residential land uses at 45 dBA and 65 dBA CNEL4, respectively. The City's General Plan Noise Element also requires that "all Residential uses should be protected with sound insulation over and above that provided by normal building construction when constructed in areas exposed to greater than 60 dB CNEL." 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 laud uses such as hospitals, school classrooms/playgrounds, churches, and libraries. 4 Community Noise Equivalent Level, is the average sound level over a 24 hour period, with a penalty of 5 d6 added between 7 p.m. and 10 p.m. and a penalty of 10 dB added for the nighttime hours of 10 p.m. to 7 a.m. The Sat Nha Buddhist Meditation Center 3-69 June 2013 Initial Study/Mitigated Negative Declaration 31 C-1 23 ICF 0021SA2