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 Table 3.3-2. Areas in the San Pablo Bay that Have Significant Sediment Contamination Site Mare Island Naval Shipyard Hamilton Army Airfield Pollutants Present As, Ag, Cr, Cu, Hg, Zn, TBT, PAHs, PCBs, dieldrin, endrin toxaphene Cr, Hg, Pb, PAHs, PCBs, DDT, petroleum Source: San Francisco Bay Regional Water Quality Control Board 1999. Section 3.9 Hazardous Substances and Waste of this EIR/EIS discusses in greater detail mercury in San Pablo Bay and dredged material, including discussion of sediment screening criteria. Site-Specific Water Quality Conditions The existing soil conditions are important in determining water quality at the proposed wetland restoration site. The site is a former tidal salt marsh and mudflat. Soils inRunoff from this area can affect water quality because of the potential presence of acid-sulfate soils. These soils may have a low pH (high acidity) and are the result of draining the historic salt marsh and the subsequent natural processes that occurred with the oxidation of sediments that had previously been submerged and under anaerobic (oxygen-deprived) conditions. Acid-sulfate soil conditions may affect the quality of runoff because low pH levels can lead to water quality problems, such as release of sulfuric acid, aluminum toxicity and the potential for release of other metals, and fluctuations in nutrient levels. These conditions will generally be eliminated if the tidal restoration is accomplished. Agricultural Runoff Areas within and surrounding the restoration site have been used historically and currently for agricultural uses. Part of the area of the proposed tidal lagoon area has been used for oat hay farming, and most of the Project site north of Highway 37 is currently used for cattle grazing. Pollutants of concern for agricultural uses include sediment, nutrients, pathogens, pesticides, metals, and salts (U.S. Environmental Protection Agency 2005). Black Point Sports Club A former shooting range, in operation since 1991, lies on the Dickson Ranch portion of the Project site. Lead shot and clay targets containing PAHs were used until 2003; steel shot and clay targets with a sulfur-based binding agent are Sears Point Wetland and Watershed Restoration Project Final Environmental Impact Report/Environmental Impact Statement 3.3-8 April 2012
California Department of Fish and Game U.S. Fish and Wildlife Service Section 3.3. Water Quality currently used. The soils from the Bird Club contain contaminants derived from lead shot and clay targets, primarily lead and PAHs (Northgate 2006). Elemental lead from shot used at the shooting range can be transported across the wetlands restoration site as a particulate by the action of surface water and wind, which could distribute lead particulates and lead-enriched soil down slope or along the prevailing wind direction. When pellets are exposed to the atmosphere and precipitation, elemental lead will tend to oxidize (or corrode) over time. Oxidation products consist primarily of lead sulfate, lead hydroxide, and lead carbonate. As pure solids, these oxidized compounds are nearly insoluble; however, physical abrasion of lead-rich metal fragments during erosion will release the oxidation products as fine particulates yielding a larger surface area prone to breakdown and leaching (Northgate 2006). The overall effect on lead concentrations in the sediment or water is expected to be very small. Groundwater Quality Groundwater levels at the Project site are generally located very close to the ground surface, although they vary seasonally with rainfall, runoff, and pumping activities (Wetlands and Water Resources 2007). During the wet season, groundwater levels raise to a point above naturally occurring topographic depressions on the site, leading to ponding of emergent groundwater (Wetlands and Water Resources 2007). In the area of the Project characterized by Bay mud, soils comprise an upper layer of historic tidal marsh and estuarine soils underlain by estuarine clay deposits that effectively act as a hydraulic barrier. Groundwater in this area is therefore very shallow and subject to salt water intrusion from San Pablo Bay. Past dairy activities on the property may have contributed to potential groundwater contamination at the site. Wastewater (from washing down cows and milking areas) was discharged to the ditch just west of the dairy site. Potential groundwater contamination from bacteria, nitrite/nitrate, and nutrients may have resulted from this practice. Due to the fact that dairy operations ceased in the 1970s, these pollutants would have dissipated and any residual effects would be minimal (Camp Dresser and McKee, Inc. 2004a). Other potential groundwater quality impacts may have resulted from pollutant infiltration due to previous activities onsite. These activities include the Black Point Sports Club, oil and grease can storage, aboveground fuel tank storage, and pesticide application to agricultural crops (Camp Dresser and McKee, Inc. 2004b). Groundwater sampling of the area near the Black Point Sports Club was done as part of the preparation for the approved CAP (Northgate 2006). The sampling indicated that the solubility and mobility of the lead under current conditions is limited as demonstrated by the absence of significant impact to shallow groundwater. Sears Point Wetland and Watershed Restoration Project Final Environmental Impact Report/Environmental Impact Statement 3.3-9 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 ES-1. Continued Page 3 of 141
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Table 1-1. List of Local, State, an
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Table 1-1. Continued Page 3 of 3 Ag
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Table 2-2. Action Alternatives Cons
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Chapter 3 Affected Environment and
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Table 3.5-2. Special-Status Species
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Table 3.5-2. Continued Page 3 of 12
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Section 3.7 Agricultural Resources
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Section 3.11 Air Quality Introducti
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Table 3.11-1. Ambient Air Quality S
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Table 3.11-32, Continued Page 2 of
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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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