31C - CUP - 803 S SULLIVAN ST - Laserfiche WebLink

Home Browse Search

City of Santa Ana Environmental Checklist quality in this area has improved, the Basin requires continued diligence to meet air quality standards. Over the past 30 years, substantial progress has been made in reducing all, pollution levels in Southern California. For example, compared to previous studies of air toxics in the Basin, the Multiple Air Toxics Exposure Study III (MATES III) completed by the SCAQMD found a decreasing risk for air toxics exposure, with the population weighted risk down by 17% from the analysis in MATES 11. However, although there has been improvement in air quality regarding air toxics, the risks are still unacceptable and are higher near sources of emissions such as ports and transportation corridor. Diesel particulate matter (DPM) continues to dominate the risk from air toxics, and the portion of all, toxic risk attributable to diesel exhaust is increasing compared to the MATES 11 Study. The MATES 111 study concluded that the average carcinogenic risk throughout the Basin, attributed to toxic air contaminants (TACs), is approximately 1,194 in one million. Mobile sources (e.g., cars, trucks, trains, ships, aircraft, etc.) represent the greatest contributes. About 83.6% of all risk is attributed to DPM emissions. Data from the closest climate monitoring station-Western Regional Climate Center's (WRCC's) Santa Ana Fire Station-was used to characterize project vicinity climate conditions. The average project area summer (August) high and low temperatures are 84.7 and 61.6°F, respectively; the average winter 0anuary) high and low temperatures are 68.0 and 43.0°F, respectively. The average annual rainfall is 13.79 inches (WRCC 2012). The closest wind monitoring station is the Anaheim wind monitoring station, which was used to characterize study area wind conditions. Wind patterns in the project vicinity display a nearly unidirectional flow, primarily from the south-southwest and southwest, at an average speed of 8 mph. Calm wind conditions are present 14.73% of the time (SCAQMD 2012). Wind direction is reversed from the stated direction only 2-3% of the time. Existing Pollutant Levels The SCAQMD has divided the Basin into air monitoring areas and maintains a network of air quality monitoring stations throughout the Basin. The project site is located in the Central Orange County Area (i.e., Source Receptor Area [SRA] Number 17). The nearest monitoring stations are in the Cities of Santa Ana and Costa Mesa, located approximately 6.5 miles northwest of the project (for Santa Ana) and 4.5 miles south of the project site (for the Costa Mesa Station). The Costa Mesa Station monitors the following criteria pollutants: carbon monoxide (CO), 03, nitrogen dioxide (NO2), and sulfur dioxide (S02); particulate matter less than or equal to 10 or 2.5 micrometers in diameter (PM10 and PM2.5, respectively) are measured at the Anaheim-Pampas monitoring station in the City of Anaheim. The most recent data available covers 2009 to 2011. Monitoring data (Table 3.1) show the following pollutant trends: state 1-hour 03 standards were exceeded once during the 3-year reputing period. The national 8-hour 03 standard was exceeded twice during the 3-year period. CO and N02 concentrations are low and no exceedances were recorded during the 3-year reporting period. Particulate (PM10 and PM2.5) concentrations are largely affected by meteorology and show some variability during the 3-year reporting period. The state 24-hour PM10 standard was exceeded once in 2009. The national PM2.5 standard was exceeded 5 times in 2009, and once in 2011. The oat Nha Buddhist Meditation Center Initial Study/Mitigated Negative Declaration 3.12 June 2013 ICF 00215.32 31 C-65