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City of Santa Ana Environmental Checklist The anticipated construction noise levels were calculated using the Federal Highway Administration's (FHWA) Roadway Construction Noise Model (RCNM). This model factors in distance from construction noise equipment to receiver, construction vehicle mix, and presence or absence of shielding from existing walls. Table 3-14 shows the noise levels calculated at a distance of 50 feet during construction phases where all pertinent equipment is present and operating. Table 3-14. Typical Noise Levels from Construction Activities at 50 Feet Construction Activity Average Sound Level at 50 feet (dBA Leq)t Excavation and Soils Export 87 Grading and Soils Prep 84 Site Trenching and Building 87 Foundation Building Construction/Concrete 87 Asphalt 82 Architectural Finishing 74 t Sound level with all pertinent equipment operating, Source: Federal Highway Administration 2008, Table 3-15 shows noise levels that would occur from implementation of the project at the existing sensitive receivers adjacent to the project site. The noise levels shown are calculated from the acoustical center of construction. The acoustical center of construction is the idealized point from which construction could occur. It takes into account the mobility of construction equipment and is derived from multiplying the furthest distance construction equipment could be from a sensitive receiver with the closest distance and then taking the square root of the product. Table 3-15. Noise Levels from Construction Activities at Closest Sensitive Receivers Apartment complex New Spirit Baptist Daycare located located West of church located North of South of Project Construction Activity Project (dBA Leq) Project (dBA Leq) (dBA Leq) Excavation and Soils Export 66 75 75 Grading and Soils Prep 62 72 72 Site Trenching and Building 65 75 75 Foundation Building 67 76 76 Construction/Concrete Asphalt 60 70 70 Architectural Finishing 52 62 62 As shown in Table 3-15, the calculated loudest construction noise level would be during the Building Construction, Construction noise levels would range from 67 to 76 dBA Leq. These noise levels are higher than the typical ambient daytime noise levels measured at the sensitive receivers to the north, east, and south of the project site. Noise levels of this magnitude would be readily audible and would likely dominate the noise environment in the area during project construction activities. The Bat Nha Buddhist Meditation Center 3-71 June 2013 Initial Study/Mitigated Negative Declaration 31 C-1 25 ICF 0021S.12