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1. Introduction and Summary 1.1 INTRODUCTION The proposed project, Mobil Oil Service Station/Car Wash Expansion, is located at 100 West MacArthur Boulevard in the City of Santa Ana, California. The project involves the expansion of the Mobil Oil service station which includes 190 square feet of additional building space with an automated car wash and convenience store. The location of the project site is shown in Figures 1-1 and 1-2, This Noise Study evaluates potential noise impacts associated with both the construction and operational phases of the proposed project located in the City of Santa Ana, The construction phase would generate noise from power tools and vehicles used in construction excavation and building construction. The operations phase would generate noise primarily from the automated car wash, 1.2 SUMMARY 1.2.1 Existing Noise Environment To assess the existing noise environment, noise monitoring for the proposed project was conducted on February 27, 2005, Noise measurements were taken at the condominium complex located 61 feet south of the project site. This location was selected since it represents the most noise-sensitive land use with the highest potential of being affected by project-related noise The noise-sensitive use closest to the project site is a multi-family condominium complex 61 feet south of the project site, 1.2.2 Environmental Impacts Potential noise impacts were evaluated based on the City of Santa Ana's Municipal Code to determine whether a significant adverse noise impact would result from the construction and operation of the proposed project. Short-term Construction Impacts ~ Project-related construction noise would result in substantial short-term increases in the ambient noise environment. Noise levels would intermittently range from 74-82 dBA. With project compliance to the City's Municipal Code Section 18,314, noise generated by construction activities would be limited to the least noise sensitive portions of the day. As such, the project would not result in a short-term unavoidable significant adverse noise impact to noise-sensitive receivers. Following the completion of project construction, noise from project construction activities would cease, Long-term Operational Impacts Potential noise impacts related to the operations phase of the project would include noise generated from the project's convenience store and automated car wash, Noise generated by the additional vehicle trips to the convenience store would be minimal and as such would not contribute substantially to noise levels. The automated car wash was found to result in noise levels which exceed the City's exterior noise standard described in Section 18-312 of the municipal code prior to the application of mitigation measures. Project generated noise levels from the automated car wash were found to be in compliance with Section 18-313 (interior noise levels) of the City's municipal code. Mitigation measures include the construction of a 12 feet sound wall which would attenuate noise levels generated by the automated car wash, With the construction of the sound wall, project related noise would be in compliance with Section 18-312 of the City's municipal code and would not result in a significant impact to the noise environment. Technical NozJe Study for Mobil Oil Station/Car WaJh Expamion The Plcmning Center Manh 2005 · Page 3 Q:\SIIA AI-Of .Oh'\,\AlmI1wh ___'\"Ji\rRepo!"I-FlSA Ld". 31A~89