Environmental Impact Statement - Sonoma Land Trust

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California Department of Fish and Game U.S. Fish and Wildlife Service Section 3.4. Public Health and Safety • Create a significant hazard to the public due to flooding and/or impeding Impede emergency access to the site during construction and post-restoration conditions. Thresholds of Significance Criteria used for determining the significance of an impact on public health are based on the State CEQA Guidelines and professional standards and practices. Impacts were considered significant if an alternative would: • Result in habitat changes that would require increasing mosquito abatement programs to maintain mosquito populations at pre-restoration levels. • Expose people to a significant risk of contracting a disease. • Impair implementation of or physically interfere with an adopted emergency response plan or emergency evacuation plan. • Place within a 100-year flood hazard area structures that would impede or redirect flood flows. • Expose people or structures to a significant risk of loss, injury, or death involving flooding, including flooding as a result of the failure of a levee or dam. Potential flood risks are addressed in Section 3.2, Surface-Water Hydrology, Tidal Hydraulics, and Sedimentation. Habitat changes that could result in a substantial decline of mosquito breeding habitat or greater efficiency of the MSMVCD’s abatement program would be considered a beneficial impact. Impacts and Mitigation Measures No-Action Alternative No increases in the current level of mosquito production or associated impacts would occur under the No-Action Alternative and the need for mosquito control would remain the same. Because the No-Action Alternative would not create additional habitat with the potential to increase mosquito populations, no increase in mosquito abatement would be required. Additionally, access for emergency vehicles would be somewhat better under the no-action alternative would not change or increase the exposure of people or structures to than under current conditions, because a significant risk of loss, injury or death involving flooding. Therefore, therevehicle access road would be no impactconstructed to the USFWS headquarters. Conclusion: No Impact. Sears Point Wetland and Watershed Restoration Project Final Environmental Impact Report/Environmental Impact Statement 3.4-6 April 2012
California Department of Fish and Game U.S. Fish and Wildlife Service Section 3.4. Public Health and Safety Action Alternatives Impact PH-1: Increase of Potential Mosquito Breeding Habitat Proposed Project The wetland habitats proposed to be created/restored in the project area include tidal marsh, non-tidal seasonal wetlands, and upland seasonal wetlands. The proposed restoration project involves breaches in the existing outboard levee to restore full tidal action for the development of approximately 970-955 acres of tidal marsh between the southern perimeter of the project site and the SMART rail line. Tidal marsh in this area would be a mixture of subtidal, intertidal and brackish open water habitat. Due to high salinities and rapidly fluctuating water levels, tidal wetlands represent the least need for regular mosquito control. Above the SMART rail line, the preservation and enhancement of 106-acres of non-tidal wetlands , and the creation of 40-acres of seasonal wetlands north of Highway 37 represents the most potential for producing problem numbers of mosquitoes. Seasonal ponding in this area is also possible from brackish drainage ditches, agricultural drainage ditches, and ponded areas within cultivated fields that may hold water during the wet season. Within seasonal wetlands as well as each of these areas, suitability for mosquito production varies, depending on water/tidal currents, the extent and duration of ponding, and site-specific salinities. In general, the seasonal wetlands component of the Project in diked baylands and north of the high tide limit represents the greatest potential need for additional mosquito control, though the degree would be affected by site-specific design and management. The proposed creation of seasonal ponds to serve as breeding habitat for California red-legged frogs also represents a potential increase in suitable mosquito breeding habitat. The potential mosquito breeding habitats resulting from the Project are quantified in Table 3.4-1. Tidal Marsh The potential for mosquito production associated with tidal wetland and marsh restoration is considered in three distinct phases over a period of several decades: (1) preparatory water managementpre-vegetation; (2) early mudflat-marsh succession; and (3) youthful tidal marsh. The preparatory/temporary non-tidal phase involving flooding and draining is expected to occur over two growing seasons. During the first year, the site would alternate between prolonged periods of shallow open water and brief periods of mud emergence. During flooding to create shallow open water, intake of Bay Sears Point Wetland and Watershed Restoration Project Final Environmental Impact Report/Environmental Impact Statement 3.4-7 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 ES-1. Continued Page 3 of 141
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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 3.6 Land Use and Public Uti
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Section 3.7 Agricultural Resources
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Section 3.11 Air Quality Introducti
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Section 3.12 Noise Introduction Thi
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Section 3.14 Aesthetics Introductio
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Section 3.15 Environmental Justice
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Chapter 4 Consultation and Other Re
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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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