Environmental Impact Statement - Sonoma Land Trust

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California Department of Fish and Game U.S. Fish and Wildlife Service Section 3.9. Hazardous Substances and Waste Mitigation Measure HAZ-MM-2a: Coordinate with State Water Board on Site Clean-Up Requirements Prior to Construction SLT shall coordinate with the RWQCB to define RWQCB requirements for site clean-up consistent with the approved CAP based on actual site conditions. Potential activities may include additional testing, removal, remediation, and disposal of affected soils. Any remedial activities will be in compliance with applicable local, state, and federal regulations. Mitigation Measure HAZ-MM-2b: Black Point Sports Club Contaminated Soil Excavation Protocols After excavation is completed to these depths described in the Corrective Action Plan, soil samples will be taken to confirm that the proposed cleanup criteria have been achieved. If not, additional soil will be removed and the remaining soil retested until the criteria are met. • Due to the presence of the shallow water table, earthmoving operations using scrapers may be impractical on the shooting range area. Instead, soil can be excavated using hydraulic excavators working from southeast to northwest, and loaded directly into trucks for transport. This will allow the excavation equipment to remain on ground that is higher than the water table and higher than the area being excavated. Excavators or Gradalls can be used to remove the soil from the northwestern slope of the outboard levee and the soil can be loaded directly into trucks located on the levee northeast of the excavation equipment. • Excavation of the soil should be performed in the dry season to minimize the moisture content of the soil to be compacted in the core of the proposed flood control levee. Excavation during the dry season also would enable easier access to the soil for removal and for post-excavation confirmatory sampling. • Although no special-status or culturally significant wildlife species have been confirmed to use the shooting range as nesting habitat, two bird species were identified as having the potential to do so (horned lark and song sparrow). Nesting for these species occurs in March through June, so it is recommended that excavation work be completed outside of this timeframe, unless it can be confirmed that the birds do not use the area for nesting. • Soil impacted by the presence of lead shot, lead compounds in the soil, clay target debris, and/or PAHs will be excavated and removed. Depending on concentrations of lead compounds and PAHs in soil and the presence of lead pellets or visible clay target fragments, the upper 0.5 feet to 2.0 feet of soil will be removed from the ground surface. In addition, the upper 0.5 feet of soil will be removed from the top and inward slope of the outboard levee and drainage ditch. The estimated area that will be excavated to a depth of 0.5 feet is approximately 148,000 square feet, amounting to a volume of approximately 2,700 cubic yards. • In areas where soil contains lead or PAHs above the proposed cleanup concentrations, soil will be removed to a depth of one foot over approximately 161,000 square feet and to a depth of two feet over approximately 43,000 square feet, amounting to volumes of approximately 6,100 and 3,200 cubic yards, respectively. Sears Point Wetland and Watershed Restoration Project Final Environmental Impact Report/Environmental Impact Statement 3.9-13 April 2012
California Department of Fish and Game U.S. Fish and Wildlife Service Section 3.9. Hazardous Substances and Waste Mitigation Measure HAZ-MM-2c: Remediation Design Tasks • Remedial design plans and specifications will be developed in conjunction with the final design phase of the restoration project. During this phase, the final layout of the new levee will be determined, and construction requirements will be specified. • The final design will address remedial implementation requirements, such as monitoring the removal, transport and consolidation activities, surveying the final elevations and dimensions of the consolidated soil, and providing field markings for the interred soil. • The remedial design will include a confirmation sampling plan to document removal of the affected soil and the quality of the soil remaining at the future wetlands surface. The remedial design also will include a sampling plan to confirm the lead and PAH content of the soil that will be interred in the levee core. • The remedial design will include a contingency in the event that confirmation results indicate that the removed soil exhibits hazardous characteristics. This contingency may include soil mixing and resampling, or possibly off-site disposal. • Health and safety requirements for workers, and other construction management components, such as dust and off-site migration control, will be provided. Mitigation Measure HAZ-MM-2d: Comply with Approved Corrective Action Plan and Prepare Implementation Report SLT shall comply with all required elements of the Corrective Action Plan. A Corrective Action Implementation Report will be prepared at the completion of the remediation. The report will document remediation activities and will include the sampling results of the confirmatory sampling program. The report will be submitted to the Water Board for approval. The Soil Management Plan will be prepared in conjunction, but separately, from the Corrective Action Implementation Report, and also will be submitted to the Water Board for approval. Conclusion: Less than Significant with Mitigation. Full-Tidal Alternative The Full-Tidal Alternative would also result in the excavation of the Black Point Sports Club soils. As such, the potential for exposure to contaminated soils during this excavation would be the same for the Full-Tidal Alternative as they are for the Project. Implementation of Mitigation Measures HAZ-MM-3 2 and HAZ-MM-5a would reduce this impact to a less-than-significant level. Conclusion: Less than Significant with Mitigation. Sears Point Wetland and Watershed Restoration Project Final Environmental Impact Report/Environmental Impact Statement 3.9-14 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 3.3 Water Quality Introduct
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Table 3.5-2. Special-Status Species
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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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