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LSA ASSOCIATES, INC. INITIAL STUDY/MITIGATED NEGATIVE DECLARATION JULY 2010 FIRST STREET BRIDGE REPLACEMENT PROJECT CITY OF SANTA ANA Type of Equipment Range of Maximum Sound Levels Measured (dBA at 50 feet) Suggested Maximum Sound Levels for Analysis dBA at 50 feet Hydraulic excavators 81-90 86 Graders 79-89 86 Air compressors 76-89 86 Trucks 81-87 86 Source: Noise Control for Buildings and Manufacturing Plants, Bolt, Beranek & Newman (1987). dBA = A -weighted decibels ft-lb/blow= foot-pounds per blow The closest sensitive receptor locations are located approximately 50 ft from the new sound barrier construction areas. These receptor locations may be subject to short-term noise exceeding acceptable levels (91 dBA L.x) generated by construction activities along the project alignment. However, as provided in the X "A" the construction activities will be limited to the allowed hours and with incorporation of Mitigation Measure N-1, noise related impacts will be reduced to less than significant levels. E. For a project located within an airport land use plan or where such a plan has not been adopted, within two miles of a public airport or public use airport, would the project expose people residing or working in the project area to excessive noise levels? No impact. The proposed project is not located near an airport and would not be affected by any land use or noise regulations associated with an airport because the project site is 8 miles from John Wayne Airport (Thomas Bros Maps, Orange County Street Guide, 2007, p. 828 J-3, p. 829 A-3). No impact is anticipated, and no mitigation is required. I. For a project within the vicinity of a private airstrip, would the project expose people residing or working in the project are to excessive noise levels. No impact. The proposed project is not located near a private airstrip and would not be affected by any land use or noise regulations associated with the operation of a private airstrip (General Plan, Airport Environs Element, 1987). No impact is anticipated, and no mitigation is required. XII. Population and Housing Would the project: A. Induce substantial population growth in an area, either directly (for example, by proposing new homes and business) or indirectly (for example, through extension of roads or other infrastructure)? No impact. The project is already developed with commercial and residential land uses, as shown on Figure 2 of Section 2.0. The proposed project will not change or add any new land use type on the site. 07/25/10 «P:\DMJ0701\MND\4.0 Environmental Analysis.doc» 411"M:n 4-33