75C - PH - BRISTOL EIR FROM WARNER TO ST. ANDREW

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I schools, and hospitals, as well as the procedure for identifying and resolving noise violations. The amount of exterior noise that can legally be generated is 55 dBA between 7:00 AM and 10:00 PM, and 50 dBA between 10 PM and 7 AM. Land Use Residential - Low Density - Medium Density - High Density Schools Commercial, Office TABLE 4 -3 USE COMPATIBILITY WITH NOISE ---------------- - - ---- Desirable Max. CNEL 55 dBA 60 dBA 65 dBA • 65 dBA Acceptable Max. CNEL 65 dBA 65 dBA 70 dBA 70 dBA 75 dBA Industrial 70 dBA 75 dBA --------------------------------------------------------- Source: City of Santa Ana General Plan Noise Element. On -Site Noise Measurements Ambient noise levels in the project area are currently affected primarily by motor vehicle noise emanating from Bristol Street. The project site is far removed from public, military, and pri- vate airports, railroads, and other significant noise generators. However, the project area is subject to the sight and sound of aircraft utilizing the John Wayne /Orange County Airport. Fifteen noise measurements were taken by Endo Engineering (Decem- ber 1986) using the system and procedures discussed on page 14 of the Appendix at thirteen representative locations along Bristol 1 Street within the APEI. The measurement locations are illus- trated in Figures 10 and 11. The measurement sites were selected as being representative of the noise sensitive receptors nearest to the roadway and there- fore most likely to be affected by the proposed project. All of ■ the measurement sites are classified as Category B activity areas Iin Table 4 -2, where exterior design noise levels of 67 dBA (Leg) apply- The measurement sites include a high school track /field, a commu- nity college auditorium, two elementary school playgrounds, two rmultifamily attached dwellings and seven single family residen- t 4 -6 75C -463