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BENDER READY-MIX CONCRETE MANUFACTURING PROJECT Initial Study/Mitigated Negative Declaration Compliance with SCAQMD rules and regulations would reduce the proposed project's construction- ' related impacts to a less than significant level. Thus, it can be reasonably inferred that the project- related construction emissions, in combination with those from other projects in the area, would not substantially deteriorate the local air quality. Thus, a less than significant impact would occur in this regard. CUMULATIVE OPERATIONAL IMPACTS As discussed previously, the existing facility operations do not exceed SCAQMD emission thresholds and do contribute to air quality impacts. Additionally, adherence to SCAQMD rules and regulations would alleviate potential impacts related to cumulative conditions on a project-by-project basis. Emission reduction technology, strategies, and plans are constantly being developed, As a result, the facility does not contribute a cumulatively considerable net increase of any nonattainment criteria pollutant. Therefore, cumulative operational impacts associated with the project are less than significant. Mitigation Measures: No mitigation is required. d) Expose sensitive receptors to substantial pollutant concentrations? ' Less Than Significant Impact. Sensitive receptors are defined as facilities or land uses that include members of the population that are particularly sensitive to the effects of air pollutants, such as children, the elderly, and people with illnesses. Examples of these sensitive receptors are residences, schools, hospitals, and daycare centers. The California Air Resources Board (CARB) has identified the following groups of individuals as the most likely to be affected by air pollution: the elderly over 65, children under 14, athletes, and persons with cardiovascular and chronic respiratory diseases such as asthma, emphysema, and bronchitis. Sensitive receptors near the project site include multi-family residences to the west of the project site. In order to identify impacts to sensitive receptors, the'SCAQMD recommends addressing localized significance thresholds for construction and operations impacts (area sources only). Carbon monoxide hot-spot analyses are generally performed for the analysis of localized mobile source impacts. LOCALIZED SIGNIFICANCE THRESHOLDS (LST) Localized Significance Thresholds (LSTs) were developed in response to SCAQMD Governing Boards' Environmental Justice Enhancement Initiative (1-4). The SCAQMD provided the Final Localized Significance Threshold Methodology (dated June 2003 [revised 2008]) for guidance. The LST methodology assists lead agencies in analyzing localized impacts associated with project-specific level proposed projects. The SCAQMD provides the LST lookup tables for one, two, and five acre projects emitting CO, NOx, PM2.5, or Mo. The LST methodology and associated mass rates are not designed to evaluate localized impacts from mobile sources traveling over the roadways. The SCAQMD recommends that any project over five acres should perform air quality dispersion modeling to assess impacts to nearby sensitive receptors. The project is located within Sensitive Receptor Area (SRA) 17, Central Orange County. The project site is approximately 0.97 acre in size; therefore, the LST thresholds for a one-acre project were utilized for the LST analysis. The closest sensitive receptors to the project site are multi-family residential units to the west of the project site. These sensitive land uses may be potentially affected by air pollutant emissions generated during on-site construction activities. LST thresholds are provided for distances to sensitive receptors of 25, 50, 100, 200, and 500 meters. As the nearest sensitive use is approximately 50 meters away, the LST value for 50 meters was utilized. JULY 2011 4.3-6 AIR QUALITY I 31A-44