Saticoy & Wells Community Plan & Development ... - City Of Ventura

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Saticoy & Wells Community Plan and Code EIRSection 4.3 Air Quality4.3 AIR QUALITYThis section analyzes the impacts of the Saticoy & Wells Community Plan and Code upon localand regional air quality. Both temporary impacts relating to construction activity and longtermimpacts associated with population growth and associated growth in vehicle traffic andenergy consumption are discussed. Impacts relating to global climate change are discussed inSection 5.0, Other CEQA Sections.4.3.1 Settinga. Local Climate and Meteorology. The semi-permanent high pressure system west ofthe Pacific coast strongly influences California’s weather. It creates sunny skies throughout thesummer and influences the pathway and occurrence of low pressure weather systems that bringrainfall to the area during October through April. As a result, wintertime temperatures inVentura are generally mild, while summers are warm and dry. During the day, thepredominant wind direction is from the west and southwest, and at night, wind direction isfrom the north and generally follows the Santa Clara River Valley.Predominant wind patterns are occasionally broken during the winter by storms coming fromthe north and northwest and by episodic Santa Ana winds. Santa Ana winds are strongnortherly to northeasterly winds that originate from high pressure areas centered over thedesert of the Great Basin. These winds are usually warm, very dry, and often full of dust. Theyare particularly strong in the mountain passes and at the mouths of canyons.Daytime summer temperatures in the area average in the high 70s to the low 90s. Nighttimelow temperatures during the summer are typically in the high 50s to low 60s, while the winterhigh temperatures tend to be in the 60s. Winter low temperatures are in the 40s. Annualaverage rainfall in Ventura ranges from about 14 to 16 inches, the majority of which falls inwinter months.Two types of temperature inversions (warmer air on top of colder air) are created in theVentura County area: subsidence and radiational (surface). The subsidence inversion is aregional effect created by the Pacific high in which air is heated as it is compressed when itflows from the high pressure area to the low pressure areas inland. This type of inversiongenerally forms at about 1,000 to 2,000 feet and can occur throughout the year, but is mostevident during the summer months. Surface inversions are formed by the more rapid coolingof air near the ground at night, especially during winter. This type of inversion is typicallylower and is generally accompanied by stable air. Both types of inversions limit the dispersal ofair pollutants within the regional airshed. The primary air pollutant of concern during thesubsidence inversions is ozone, while carbon monoxide and nitrogen oxides are of greatestconcern during winter inversions.b. Local Regulatory Framework. Both the federal and state governments haveestablished ambient air quality standards for the protection of public health. The U.S.Environmental Protection Agency (USEPA) is the federal agency designated to administer airquality regulation, while the California Air Resources Board (CARB) is the state equivalent in4.3-1City of Ventura
Saticoy & Wells Community Plan and Code EIRSection 4.3 Air Qualitythe California Environmental Protection Agency. Local control in air quality management isprovided by the CARB through county-level Air Pollution Control Districts (APCDs). TheCARB has established air quality standards and is responsible for the control of mobile emissionsources, while the local APCDs are responsible for enforcing standards and regulatingstationary sources. The CARB has established 14 air basins statewide. In addition, the Cityfurther regulates air quality through the City’s Air Quality Ordinance (Ordinance 93-37). Thisordinance requires developers of projects that generate emissions exceeding Ventura CountyAPCD (VCAPCD) significance thresholds to pay air quality impact fees that are placed in atransportation demand management (TDM) fund that is used by the City to offset projectemissions through implementation of regional air quality programs.The USEPA has set primary national ambient air quality standards (NAAQS) for ozone (O 3 ),carbon monoxide (CO), nitrogen dioxide (NO 2 ), sulfur dioxide (SO 2 ), suspended particulates,known as PM 10 (particulate matter with a diameter of 10 microns or less) and PM 2.5 (particulatesof less than 2.5 microns in diameter), and lead (Pb). Primary standards are those levels of airquality deemed necessary, with an adequate margin of safety, to protect public health. Inaddition, the State of California has established health-based ambient air quality standards forthese and other pollutants, some of which are more stringent than the federal standards. Table4.3-1 lists the current Federal and State standards for regulated pollutants.Table 4.3-1Federal and State Ambient Air Quality StandardsPollutant Averaging Time Federal Primary Standards California StandardOzoneCarbon MonoxideNitrogen DioxideSulfur Dioxide1-Hour --- 0.09 ppm8-Hour 0.075 ppm 0.07 ppm8-Hour 9.0 ppm 9.0 ppm1-Hour 35.0 ppm 20.0 ppmAnnual 0.053 ppm 0.03 ppm1-Hour --- 0.18 ppmAnnual 0.03 ppm ---24-Hour 0.14 ppm 0.04 ppm1-Hour --- 0.25 ppmPM 10PM 2.5LeadAnnual --- 20 µg/m 324-Hour 150 µg/m 3 50 µg/m 3Annual 15 µg/m 3 12 µg/m 324-Hour 35 µg/m 3 --30-Day Average --- 1.5 µg/m 33-Month Average 1.5 µg/m 3 ---ppm = parts per millionµg/m 3 = micrograms per cubic meterSource: California Air Resources Board, www.arb.ca.gov/research/aaqs/aaqs2.pdf, April 1, 2008.4.3-2City of Ventura
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