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