Environmental Impact Statement - Sonoma Land Trust

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California Department of Fish and Game U.S. Fish and Wildlife Service Section 3.11. Air Quality includes the City of San Francisco; portions of Sonoma and Solano Counties; and all of San Mateo, Santa Clara, Alameda, Contra Costa, Marin, and Napa Counties. Air quality conditions in the SFBAAB are regulated by the BAAQMD. Sonoma County has complex geography and climates. The coastal mountain ranges from several valleys with varying climate regimes including the Cotati/Petaluma Valleys, Sonoma Valley, and Alexander Valley. The Project is located in the Petaluma Valley. The Cotati Valley to the north and Petaluma Valley to the south create a wide basin stretching from Santa Rosa to San Pablo Bay. These valleys are bordered on the east by the Sonoma Mountains. To the west is a series of low hills and the Estero Lowlands, a relatively flat area surrounding Estero Americano, which is the southern boundary of the county at that point. The region from the Estero Lowlands to San Pablo Bay is known as the Petaluma Gap. This low-level gap in the coastal hills is a major source of marine air flow into the county and the northern Bay Area. Wind patterns in the Petaluma and Cotati Valleys are strongly influenced by the Petaluma Gap, with winds predominantly from the west. As marine air travels through the Petaluma Gap, it creates northward and southward air currents moving into the Cotati and Petaluma Valleys. The southward path continues into San Pablo Bay and through the Carquinez Strait. Because of this pattern, the prevailing wind direction in Santa Rosa is from the southwest while the prevailing wind direction in Petaluma is from the northwest. The air pollution potential (i.e., the limitation of the atmosphere’s ability to transport and dilute pollutants) is low in the Petaluma Valley because of the influence of the Petaluma Gap. Pollution potential is higher in the Cotati Valley, which is less well ventilated and has natural barriers to air flow to the north and east (Nichols-Berman2006). Criteria Pollutants The federal and state governments have established ambient air quality standards for the following six criteria pollutants: ozone, carbon monoxide (CO), nitrogen dioxide (NO 2 ), sulfur dioxide (SO 2 ), particulate matter (particulate matter smaller than 10 microns or less in diameter [PM10] and particulate matter smaller than 2.5 microns or less in diameter [PM2.5]), and lead. Ozone, NO 2 , and particulate matter generally are considered to be “regional” pollutants, as these pollutants or their precursors affect air quality on a regional scale. Pollutants such as CO, SO 2 , lead, and particulate matter are considered to be local pollutants that tend to accumulate in the air locally. Particulate matter is considered to be a localized pollutant as well as a regional pollutant. Within the project area, CO, PM10, and ozone are considered pollutants of concern. Toxic air contaminants (TACs) are discussed below also, although no state or federal ambient air quality standards exist for these pollutants. Brief descriptions of these pollutants are provided below, and a complete summary of California Ambient Air Quality Standards (CAAQS) and National Ambient Air Quality Standards (NAAQS) is provided in Table 3.11-1. Sears Point Wetland and Watershed Restoration Project Final Environmental Impact Report/Environmental Impact Statement 3.11-2 April 2012
Table 3.11-1. Ambient Air Quality Standards Applicable in California Pollutant Symbol Average Time Standard (parts per million) Standard (micrograms per cubic meter) Violation Criteria California National California National California National Ozone * O 3 1 hour 0.09 NA 180 NA If exceeded NA 8 hours 0.070 0.08 137 157 If exceeded If fourth highest 8-hour concentration in a year, averaged over 3 years, is exceeded at each monitor within an area Carbon monoxide CO 8 hours 9.0 9 10,000 10,000 If exceeded If exceeded on more than 1 day per year 1 hour 20 35 23,000 40,000 If exceeded If exceeded on more than 1 day per year (Lake Tahoe only) 8 hours 6 NA 7,000 NA If equaled or exceeded NA Nitrogen dioxide NO 2 Annual average 0.030 0.053 56 100 NA If exceeded on more than 1 day per year 1 hour 0.18 NA 338 NA If exceeded NA Sulfur dioxide SO 2 Annual average NA 0.03 NA 80 NA If exceeded 24 hours 0.04 0.14 105 365 If exceeded If exceeded on more than 1 day per year 1 hour 0.25 NA 655 NA If exceeded NA Hydrogen sulfide H 2 S 1 hour 0.03 NA 42 NA If equaled or exceeded NA Vinyl chloride C 2 H 3 Cl 24 hours 0.01 NA 26 NA If equaled or exceeded NA Inhalable particulate matter PM10 Annual arithmetic mean NA NA 20 NA NA NA 24 hours NA NA 50 150 If exceeded If exceeded on more than 1 day per year PM2.5 Annual arithmetic mean NA NA 12 15 NA If 3-year average from single or multiple community-oriented monitors is exceeded 24 hours NA NA NA 35 NA If 3-year average of 98 th percentile at each population-oriented monitor within an area is exceeded Sulfate particles SO 4 24 hours NA NA 25 NA If equaled or exceeded NA Lead particles Pb Calendar quarter NA NA NA 1.5 NA If exceeded no more than 1 day per year 30-day average NA NA 1.5 NA If equaled or exceeded NA Notes: All standards are based on measurements at 25ºC and 1 atmosphere pressure. National standards shown are the primary (health effects) standards. NA = not applicable. * The U.S. Environmental Protection Agency recently replaced the 1-hour ozone standard with an 8-hour standard of 0.08 part per million. EPA issued a final rule that revoked the 1-hour standard on June 15, 2005. However, the California 1-hour ozone standard will remain in effect. Source: California Air Resources Board 2008a
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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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Section 3.1 Geology, Soils, and Pal
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Section 3.2 Surface-Water Hydrology
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Section 3.3 Water Quality Introduct
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Section 3.4 Public Health and Safet
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Table 3.5-2. Special-Status Species
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Section 3.7 Agricultural Resources
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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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