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 water would be used to maintain water levels and increase salinity. The site would support only sparse wetland vegetation the first summer, and water surface turbulence due to wind/wave action would restrict significant production of standing water mosquitoes. However, the muddy, wet shoreline edges of the flooded basin would have some potential to produce floodwater mosquitoes. Drawdown periods would be less than ten days in duration in order to allow germination and initial marsh seedling growth, but prevent excessive mosquito reproduction in exposed mud. Drawdown that exposes mud for more than 10 days is not recommended because of the potential for mosquito production (Kwasny et al. 2004). During the second growing season of tidal wetland/marsh restoration, patches of relatively dense marsh vegetation may serve to calm water surfaces and support the production of standing water mosquitoes. While water surface turbulence caused by wind-wave action is likely to inhibit significant mosquito production over most of the site, this impact could be significant. After two years of non-tidal water managementThe pre-vegetation phase involving irrigation to develop sacrificial vegetation is expected to occur over one to two growing seasons. Irrigated areas may have some standing water that could provide suitable mosquito breeding habitat. After the pre-vegetation phase and following tidal breaching, substantial mosquito production would not be likely to occur due to unsuitable habitat conditions. Early stages of fully tidal mudflat-marsh succession are generally unlikely to produce nuisance mosquito sources, based on past experience in San Pablo Bay (Sears Point Wetlands and Watershed Restoration Project Final Preliminary Plan; 5.2.8 Mosquito Production). This condition should prevail over most of the site for several years. However, following tidal breaching, mosquito production may be significant in specific shoreline habitats, such as high marsh pans (a.k.a. pannes) or large deposits of moist organic tidal litter. During construction of tidal wetland habitats and prior to tidal breaching, surface water may pond in depressions on the work site, potentially providing suitable habitat for mosquito production and propagation of vector-borne diseases that could threaten public health. These impacts are considered potentially significant. To minimize these impacts, SLT or its successors in interest shall implement Mitigation Measure PH-MM-1. Mitigation Measure PH-MM-1: Coordinate Water Management, Restoration Design, Construction, and Operation Activities with MSMVCD The following mitigation measure ensures that suitable habitat for mosquito production remains controlled and properly regulated throughout the design, construction, and implementation of the Project: SLT or its successors in interest shall continue to consult and coordinate with the MSMVCD during the design, construction, and operational phases of the Project. Sears Point Wetland and Watershed Restoration Project Final Environmental Impact Report/Environmental Impact Statement 3.4-8 April 2012
California Department of Fish and Game U.S. Fish and Wildlife Service Section 3.4. Public Health and Safety Consultation and coordination with MSMVCD to develop and implement strategies to reduce site suitability for mosquito breeding or control breeding populations shallmay include the following actions: • Continue to Cconsult with MSMVCD during project design to incorporate design elements of nontidal wetland habitats to reduce the mosquito production potential of the project. • Design water delivery and drainage systems in nontidal habitats to allow for rapid manipulation of water levels in wetlands. • Mitigate the mosquito potential of high marsh pans by designing sizes, shapes, and orientation according to prevailing winds in order to maximize the potential for wind-wave turbulence of the flooded water surface. Minimal pan sizes of several thousand square feet, and exposure to westerly winds along the long axis of the pans, are expected to minimize production of standing saltwater mosquitoes. Rapid desiccation and hypersalinity of the high marsh pan following June-July spring high tides may also restrict floodwater mosquito production, relative to more gradually drained and dried pans of intertidal marsh plains. • Size subtidal channels and ponds to ensure sufficient wind-wave turbulence to inhibit mosquito breeding. • Consult with MSMVCD to develop and implement feasible measures to reduce the likelihood of ponding of surface water on the project area during the construction period. • Permit MSMVCD to have access to the project area to monitor or control mosquito populations. Control activities on Refuge lands shall be consistent with the Refuge’s Mosquito Management Plan. • Manage water level fluctuations according to best management practices for nontidal wetlands. • Regularly consult with MSMVCD to identify mosquito management problems, mosquito monitoring and abatement procedures, and opportunities to adjust water management practices in nontidal wetlands to reduce mosquito production during problem periods. • Consult with MSMVCD to identify annual mosquitofish stocking requirements in nontidal wetlands. • Consult with MSMVCD to identify opportunities for the Sonoma Land Trust to share costs or otherwise participate in implementing mosquito abatement programs if it is necessary for MSMVCD to increase mosquito monitoring and control programs beyond pre-project levels. • Include non-chemical control methods to minimize mosquito production to the maximum extent possible. • Apply periodic air and ground applications of mosquito larvicides such as Golden Bear Oil 1111, BTI (Bacillus thurigiensis var. israelensis), Agnique, methoprene growth regulators, or other EPA-approved pesticides, as needed using aerial or ground application methods, and as allowed on USFWS Refuge property. Sears Point Wetland and Watershed Restoration Project Final Environmental Impact Report/Environmental Impact Statement 3.4-9 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 3.7 Agricultural Resources
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Section 3.11 Air Quality Introducti
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Sonoma Land Trust Chapter 4. Consul
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Environmental Impact Statement - Sonoma Land Trust

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