2014-028 - Approving General Plan Amendement No. 2014-01

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City of Santa Ana -Park View at Town and Country Manor Draft EIR from soil under homes. It is a known human lung carcinogen and is the largest source of radiation exposure to the public. Most is rapidly exhaled; however, the inhaled decay products can deposit into the lung where they irradiate sensitive airway cells increasing the risk of lung cancer. Indoor radon tests in the project's zip code, 92706, indicate that 0 percent of the nine samples contained radon concentrations in excess of the EPA threshold of 4 pCi/l. The California Department of Public Health classifies zip codes with indoor radon concentrations greater than 4.0 pCi/1 as follows: 0 -6 percent - low potential; 7 -19 percent - moderate potential; 20 percent or more - high potential. Indoor radon concentrations are of most concern in residential structures with basements because such structures are of lower pressure than surrounding outdoor conditions and, therefore, have the ability to suction radon indoors. In contrast, slab -on -grade commercial structures have a much lower ability to suction radon indoors because they are much larger and are not below grade, which substantially reduces the pressure differential between indoors and outdoors. Moreover, the project would employ an HVAC system that would circulate air through the structure during round - the -clock operational hours. Such a system would be sufficient to disperse indoor radon concentrations, which would minimize the risk to human health. Accordingly, indoor radon exposure would be a less than significant impact. Operation: Toxic Air Pollutants The ARB Air Quality and Land Use Handbook contains recommendations that will "help keep California's children and other vulnerable populations out of harm's way with respect to nearby sources of air pollution," including recommendations for distances between sensitive receptors and certain land uses. These land uses are explored below. • ARB recommends avoiding new sensitive land uses within 500 feet of a freeway, urban roads with 100,000 vehicles per day, or rural roads with 50,000 vehicles per day. Epidemiological studies indicate that the distance from the roadway and truck traffic densities were key factors in the correlation of health effects, particularly in children. At General Plan build out, the maximum average daily traffic (ADT) for an off -site roadway is on Main Street and is 51,989. The project is located approximately 1200 feet from Main Street. The project is also located approximately 2,000 feet east of Interstate 5. Finally, the project is located approximately 1,200 feet from the Garden Grove Freeway (State Route 22). Therefore, the project is not located within 500 feet of the land uses suggested by the ARB; therefore, project residences are not likely to be significantly impacted by pollutant sources from the nearby roadway network. • ARB also recommends avoiding siting new sensitive land uses within 1,000 feet of a distribution center. Review of aerial photography indicates that no distribution center exists within 1,000 feet of the project. • ARB recommends avoiding new sensitive land uses within 300 feet of a large fueling station (a facility with a throughput of 3.6 million gallons per year or greater). A 50 -foot separation is recommended for typical gas dispensing facilities. The nearest fueling station is approximately 2,600 feet east of the project. 4.2 -30 Michael Brandman Associates H\Cl t(PN- JMb327b327W3MMVB270030 Sec 2AvQ ity.D