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City of Santa Ana -Park View at Town and Country Manor <br />Draft EIR <br />State ambient air quality standard. The thresholds are developed based on the ambient concentrations <br />of that pollutant for each source receptor area and on the location of the sensitive receptors. If the <br />project results in emissions under those thresholds, it follows that the project would not cause or <br />contribute to an exceedance of the standard. If the standards are not exceeded at the sensitive <br />receptor locations, it follows that the receptors would not be exposed to substantial pollutant <br />concentrations. <br />The localized construction analysis (Impact 4.2.2) demonstrated that without mitigation, the project <br />would not exceed the localized thresholds for CO. However, the project would exceed the localized <br />thresholds for nitrogen dioxide, PM,,, and PM2, Therefore, during construction, the project could <br />expose sensitive receptors to substantial pollutant concentrations of nitrogen dioxide, PM,,, and PM2s <br />without mitigation. <br />The existing Town and Country Manor buildings have a ventilation system with air quality filters that <br />are changed every month. This will help reduce impacts during construction to the existing Town and <br />Country Manor residents. <br />The construction equipment would emit diesel particulate matter, which is a carcinogen. However, <br />the diesel particulate matter emissions are short-term in nature. Determination of risk from diesel <br />particulate matter is considered over a 70 -year exposure time. Therefore, considering the dispersion <br />of the emissions and the short time frame, exposure to diesel particulate matter is anticipated to be <br />less than significant. <br />Operation: Carbon Monoxide <br />A CO hot spot analysis is the appropriate tool to determine if project emissions of CO during <br />operation would exceed ambient air quality standards. The main source of air pollutant emissions <br />during operation are from offsite motor vehicles traveling on the roads surrounding the project. The <br />CO hot spot analysis (Impact 4.2.3) demonstrated that emissions of CO during operation would not <br />result in an exceedance of the most stringent ambient air quality standards for CO. Therefore, <br />according to this criterion, air pollutant emissions during operation would result in a less than <br />significant impact. <br />Operation: Indoor Air Pollution <br />The indoor air pollutants that may be associated with operation of the project include VOCs from new <br />carpets and fresh paints, mold spores, radon, cigarette smoke, and combustion sources. The air <br />pollutants that are controlled by the construction of the project include VOCs from carpets, paints, <br />and radon. VOCs from new carpets and new paint are temporary impacts that can be reduced by <br />proper ventilation after installation. The health impact from these sources is anticipated to be less <br />than significant. <br />Radon is a naturally occurring colorless, odorless, and tasteless radioactive gas originating from the <br />radioactive decay of uranium in rock, soil, and groundwater. Radon gets inside a building primarily <br />Michael Brandman Associates 4.2 -29 <br />H\Cl t(PN- JMb327b32]003MMVB2]0030 Se 4GAvQ ity.DOc <br />