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Hacienda Mixed Use Rezoning Initial Study Environmental Setting The three project sites are located within Hacienda and are surrounded by office, light industrial, and residential development. The sites are already allowed to be developed under the Hacienda PUD (for which a EIR has been certified). No agricultural land uses are located within the project vicinity. Significance Criteria The impact questions above constitute the significance criteria for this environmental topic. Discussion of Checklist Questions No Impact. The project sites are not developed as farmland, are not under Williamson Act contract, and have been within a business park since its inception. Less Than Potentially Significant with Less Than No Significant Mitigation Significant Impact Impact Incorporation Impact 3. Air Quality Where available, the significance criteria established by the applicable air quality management or air pollution control district may be relied upon to make the following determinations. Would the project: a) Conflict with or obstruct implementation of the X applicable air quality plan? b) Violate any air quality standard or contribute substantially X to an existing or projected air quality violation? c) Result in a cumulatively considerable net increase of any X criteria pollutant for which the project region is non attainment under an applicable federal or state ambient air quality standard (including releasing emissions which exceed quantitative thresholds for ozone precursors)? d) Expose sensitive receptors to substantial pollutant X concentrations? e) Create objectionable odors affecting a substantial number X of people? Background Land uses such as schools, children's daycare centers, hospitals, convalescent homes, and senior housing are considered to be more sensitive than the general public to poor air quality because the population groups associated with these uses have a greater susceptibility to respiratory distress. Persons engaged in strenuous work or exercise also have a greater sensitivity to poor air quality. Residential areas are considered more sensitive to air quality conditions than commercial and industrial areas, because people generally spend longer periods of time at their residences, resulting in greater exposure to ambient air quality conditions. Recreational uses are also considered sensitive, due to the greater exposure to ambient air quality conditions, and because the presence of pollution detracts from the recreational experience. Draft, Subject to Revision 8 8/31/2009