Environmental Impact Statement - Sonoma Land Trust

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California Department of Fish and Game U.S. Fish and Wildlife Service Section 3.12. Noise pumping activities. Existing noise-sensitive land uses located in the vicinity of the construction activity could be exposed to construction noise. Table 3.12-12 summarizes typical noise levels produced by construction equipment commonly used for development of wetland restoration sites. As indicated, equipment involved in construction is expected to generate noise levels ranging from 76 dB to 89 dB at a distance of 50 feet. Table 3.12-12. Construction Equipment Noise Emission Levels Equipment Typical Noise Level (dBA) 50 feet from Source Backhoe 80 Compactor 82 Crane, Derrick 88 Crane, Mobile 83 Dozer 85 Grader 85 Loader 85 Paver 89 Pump 76 Scraper 89 Truck 88 Source: Federal Transit Administration 2006. Noise from construction activity typically attenuates at a rate of 6 decibels (dB) per doubling of distance. Additional attenuation of approximately 1–2 dB per doubling of distance also occurs where the ground is acoustically absorptive (i.e., vegetation covers the ground). It is reasonable to assume that the three loudest pieces of equipment would operate at the same time in the same area. The combined noise level from a paver (89 A-weighted dB [dBA]), a truck (88 dBA), and scraper (89 dBA) would be 93 dBA at 50 feet. Based on this, construction noise can be expected to be as high as the following levels at various distances from the construction activity: • 93dBA-L max at 50 feet • 86 dBA-L max at 100 feet • 78 dBA-L max at 200 feet • 70dBA-L max at 400 feet • 62 dBA-L max at 800 feet • 59 dBA-L- L max at 1,000 feet • at 54dBA-L max at 1,600 feet. Sears Point Wetland and Watershed Restoration Project Final Environmental Impact Report/Environmental Impact Statement 3.12-6 April 2012
California Department of Fish and Game U.S. Fish and Wildlife Service Section 3.12. Noise Storm Water Pump Operations Electric drainage pumps ranging in size from 15 hp to 160 hp would be used on the Project site. Under the Project two 160 hp pumps would be installed along Reclamation Road, approximately 4000 feet apart. One 15 hp pump would be installed approximately 4,500 feet away from the nearest 160 hp pump. The Bay Trail would be extended adjacent to the individual pump locations, and the noise level at 10 feet would be about 96 dBA, attenuating to 82.1 dBA at 50 feet (Hoover and Keith 1996). Under the Full-Tidal Alternative, one 160 hp pump would be installed in the area between the Highway 37 levee and Highway 37, and the noise level from 50 feet would be 82.1 dBA. Thresholds of Significance Criteria used for determining the significance of a noise impact are based on the State CEQA Guidelines and professional standards and practices. Impacts were considered significant if an alternative would: • result in a substantial permanent increase in ambient noise levels in the project vicinity above levels existing without the project; or • result in a substantial temporary or periodic increase in ambient noise levels in the project vicinity above levels existing without the project. Impacts and Mitigation Measures No -Action Alternative Under the No -Action Alternative, only limited construction would occur. Nnoise impacts would occur. Furthermore, ambient sound levels in the project area would be slightly less thanlevels are expected to be similar to current conditions since. Hunting at the Black Point Sports Club use of the Dickson Ranch would be discontinued prior to transfer of the property to CDFG and public waterfowl hunting would be allowed. Other recreational activities would generate only very low levels of noise. Agricultural practices may continue on portions of the property managed by USFWS; however, it is not expected that there would be an increase in noise above current levels. Therefore, there would be no adverse impact. Conclusion: No Impact. Sears Point Wetland and Watershed Restoration Project Final Environmental Impact Report/Environmental Impact Statement 3.12-7 April 2012
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Sears Point Wetland and Watershed R
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Sears Point Wetland and Watershed R
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Contents List of Tables ...........
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California Department of Fish and G
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Executive Summary This summary prov
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Table ES-1. Summary of Impacts and
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Table 1-1. List of Local, State, an
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Table 2-2. Action Alternatives Cons
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Chapter 3 Affected Environment and
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Section 3.1 Geology, Soils, and Pal
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Section 3.2 Surface-Water Hydrology
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Section 3.3 Water Quality Introduct
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Table 3.5-2. Special-Status Species
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Section 3.7 Agricultural Resources
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Sonoma Land Trust Chapter 4. Consul
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Chapter 5 Public Involvement and Sc
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Sonoma Land Trust Chapter 7. Refere
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Environmental Impact Statement - Sonoma Land Trust

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