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III. Environmental Setting, Impacts,and Mitigations G. Air Quality non-cancer health effects,global warming effects from methane emissions,explosion hazards, and odor nuisance(EPA, 1991 a). The SWAT conducted for the Austin Road Landfill in 1987 showed that the concentration of vinyl chloride in the air sample was less than the Calderon guideline lower limit of 2 parts per billion(ppb)(City of Stockton, 1988). The mean well gas sample concentrations were 682.5 ppb for benzene,5,405 ppb for vinyl chloride,31.45 ppb for trichloroethene, and 75.8 ppb for tetrachloroethene. Other Calderon chemicals were not detected at the Calderon guideline lower limits. Odorous Emissions As bacterial decomposition proceeds,odoriferous compounds can escape from the landfill surface through cracks in the surface cover. Other possible sources of odors are the actual wastes. Some household and consumer products contain substances with distinctive odors. The major contribution to odors come from two groups of compounds: the first group dominated by esters and organosulfurs, and the second group consists of alkyl benzenes and limonene. Together with hydrocarbons,the second group is probably responsible for the background smell associated with a landfill (EPA, 1991 a). Sensitive Receptors Some land uses are considered more sensitive to air pollution than others,due to the types of population groups or activities involved. Land uses such as schools,hospitals, and convalescent homes are considered to be relatively sensitive to poor air quality because the young,the old, and the infirm are more susceptible to respiratory infections and other air-quality-related health problems than the general public. Residential land uses are considered sensitive to air pollution, as residents,including the young and the elderly,could be exposed to ambient air pollutant concentrations that could have adverse health impacts. For this project,the residential units along Austin Road between Arch Road and French Camp Road,about seven of them,would be considered as sensitive receptors. The nearest residences are southeast of the current landfill. One is on the southeast corner of the Brocchini parcel. It would be removed with the project. The next nearest residence is approximately 1,700 feet from the existing fill area. The CYA facility is about 1,900 feet north of the current landfill footprint. III.G.8