SU0014502 - Laserfiche WebLink

Home Browse Search

Administrative Draft Environmental Impact Report Gill Medical Center Project odor; in fact, an odor that is offensive to one person (e.g., from a fast-food restaurant) may be perfectly acceptable to another. It is also important to note that an unfamiliar odor is more easily detected and is more likely to cause complaints than a familiar one. This is because of the phenomenon known as odor fatigue, in which a person can become desensitized to almost any odor and recognition only occurs with an alteration in the intensity. Quality and intensity are two properties present in any odor.The quality of an odor indicates the nature of the smell experience. For instance, if a person describes an odor as flowery or sweet, the person is describing the quality of the odor. Intensity refers to the strength of the odor. For example, a person may use the word "strong" to describe the intensity of an odor. Odor intensity depends on the odorant concentration in the air. When an odorous sample is progressively diluted, the odorant concentration decreases.As this occurs, the odor intensity weakens and eventually becomes so low that the detection or recognition of the odor is quite difficult.At some point during dilution, the concentration of the odorant reaches a detection threshold.An odorant concentration below the detection threshold means that the concentration in the air is not detectable by the average human. Land uses commonly considered to be potential sources of obnoxious odorous emissions include agriculture (farming and livestock), wastewater treatment plants, food processing plants, chemical plants, composting facilities, refineries, landfills, dairies, and fiberglass molding. Of these, the Project would include an onsite wastewater treatment "package plant." The package plant would have fully enclosed systems capable of odor control. Therefore, odor impacts are less than significant. Mitigation Measures None required. 4.5.4 Cumulative Impacts By its very nature, air pollution is largely a cumulative impact. No single project is sufficient in size, by itself, to result in nonattainment of ambient air quality standards. Instead, a project's individual emissions contribute to existing cumulatively significant adverse air quality impacts. If a project's individual emissions exceed its identified significance thresholds, the project would be cumulatively considerable. Projects that do not exceed significance thresholds would not be considered cumulative considerable.As identified in the analysis above, the Project would not exceed significance thresholds or otherwise result in any project-level impact. Thus, the Project is considered less than cumulatively considerable in terms of air quality-related impacts. Mitigation Measures None required. Air Quality 4.5-25 October 2021