Environmental Impact Statement - Sonoma Land Trust

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California Department of Fish and Game U.S. Fish and Wildlife Service Section 3.3. Water Quality warning of potential bioaccumulation and biomagnification due to methyl mercury. The monitoring of sentinel species can be used to identify when trigger levels may be reached at which time corrective actions would be taken to reduce associated risks with increased methyl mercury levels. Corrective actions could include changes in water management, changes in vegetation conditions through plantings or other measures. The methyl mercury adaptive management plan shall be modified as necessary to reflect increased understanding of mercury cycling in San Francisco Bay. Conclusion: Less than significant with mitigation. Full-Tidal Alternative As above, there is a potential for increased methyl mercury concentrations under the Full-Tidal Alternative and resulting bioaccumulation and biomagnifications impacts. Mitigation Measure WQ-MM-3 is recommended2 would be implemented to minimize this impact. Conclusion: Less than significant with mitigation. Impact WQ-3: Degradation of Groundwater Quality Because the groundwater table at the proposed wetland restoration site is shallow (and even creates surface ponding of emergent groundwater during the wet season), there is potential for contamination of groundwater supplies during contact with surface water and soils. Proposed Project Inundation of the wetlands restoration area could degrade shallow groundwater through saltwater intrusion or leaching of hazardous materials. However, the shallow groundwater in the expansion area south of the SMART railroad tracks already has a high salinity because of the historic influence of San Pablo Bay. Because of the presence of Bay muds at the site, surface water and shallow groundwater are unlikely to recharge deeper groundwater aquifers. As such, potential exchange of saline water contaminants between surface water and shallow groundwater are considered less than significant, and no mitigation is required. Conclusion: Less than Significant. Sears Point Wetland and Watershed Restoration Project Final Environmental Impact Report/Environmental Impact Statement 3.3-18 April 2012
California Department of Fish and Game U.S. Fish and Wildlife Service Section 3.3. Water Quality Full-Tidal Alternative As above, further degradation of groundwater supplies is unlikely due to the Sears Point site’s historic connection to San Pablo Bay. Contamination of shallow groundwater supplies through salt water intrusion or hazardous materials spills areis therefore unlikely to affect deeper groundwater aquifers. This impact is considered less than significant, and no mitigation is required. Conclusion: Less than Significant. Impact WQ-4: Changes in Dissolved Oxygen Concentration in Receiving Waters Proposed Project Implementation of the Project would initially create a new basintidal area with a muted tidal regime by breeching the existing levee (see Section 3.2, Surface- Water Hydrology, Tidal Hydraulics, and Sedimentation). The shallow depths, windy conditions, and tidal exchange velocities should maintain relatively high dissolved oxygen concentrations in the restored wetlands, providing adequate habitat conditions for aquatic organisms and fish. Inadequate tidal flushing in portions of the new basinrestored area due to a lack of circulation could result in stagnation, depressed dissolved-oxygen concentrations, and algal blooms. The pre-vegetation construction phase would involve temporary water control structures to manage the site as a muted system for 1–2 years. The water control structures allow for built-in adaptability in the system to avoid problems likeWater with low dissolved oxygen levels and stagnant water. could also be discharged from the site. Additionally, since the tidal restoration plan has been designed to include adequate channel formation to assure tidal flows throughout the tidal basin, these effects are not anticipated. Additional breach(es) (Breaches 3 and/or 4) would be considered if it is determined to improve dissolve oxygen levels within the site. Therefore, this impact is considered less than significant, and no mitigation is required. Conclusion: Less than Significant. Full-Tidal Alternative As above for the Project, shallow depths, windy conditions, and tidal velocities will maintain relatively high dissolved oxygen levels; however, a muted tidal system could also create stagnant pools and associated areas of depressed dissolved-oxygen concentrations. This is of particular concern north of the rail line, where there is a potential for more sheltered conditions and flows are limited to the capacity provided by the bridge or box culvert in the rail line levee. The bridge or box culvert would be sized to avoid potential flow constrictions. Sears Point Wetland and Watershed Restoration Project Final Environmental Impact Report/Environmental Impact Statement 3.3-19 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 3.6 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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