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048 The proposed expansion would add an additional 147,000 square feet of development which is expected to increase traffic noise levels in the area by less than 1 dB. The threshold of a perceptible increase in noise is 3 dB. Therefore, the expected increase from the proposed expansion is much lower than the initial level of a perceptible increase in no. ise. Noise generated from construction activity by the proposed expansion will be subject to the City's Noise Ordinance (No. NS-1441) which limits noise from construction from occurring outside of the daytime hours. There are no noise sensitive land uses in the immediate vicinity of the proposed expansion. Therefore, the Planning Commission finds that there will be no adverse noise effects from the proposed expansion. 8. Air Quality MainPlace is located in the Orange County portion of the South Coast Air Quality Basin which is classified as a nonattainment area for state and federal carbon monoxide (CO) levels, an extreme nonattainment area for the state and federal ozone standards and a nonattainment area for the state and federal standards for particulate matter smaller than 10 microns (PM10). Based upon a worst-case scenario of the construction related emissions from the proposed expansion (assuming the maximum number of trips to be made during any day of construction times, the maximum number of construction workers, and the maximum number of hours of operation of each type of construction equipment expected to be used on the busiest day of construction), the proposed expansion would generate emissions of approximately 72 pounds per day (ppd) of CO, 8 ppd of reactive organic gases (ROG), 75 ppd of oxides of nitrogen (Nox), and 119 ppd of PMI0. Th6se amounts are well below the South Coast Air Quality Managements District's construction emissions thresholds of 550 ppd of CO, 75 ppd of ROG, I00 ppd of Nox, and 150 ppd of PM10. Furthermore, the operations related emissions from the proposed expansion together with the emissions from the portion of the approved MainPlace project already developed would be well below the quantities generated by the approved project in the certified EIR. Thus, the Planning Commission finds that no new or more severe adverse effects would result to air quality from the proposed expansion. 9. Shade/Shallow, Solar Glare, Illumination. The certified EIR analyzed the shade/shadow impacts of the approved project based on multi-story buildings ranging from 8-story to 52-story buildings. The EIR determined that no impacts would result. The existing development in MainPlace is no higher than a 3-story building. The Planning Commission finds that the proposed expansion would blend with the existing structures, thereby not creating any adverse effects to shade/shallow. The EIR also analyzed the effects of the use of reflective materials for building surfaces, as well as the illumination from signage and parking areas. The existing development in MainPlace uses construction materials with no reflective surfaces. The Planning Commission finds that the proposed expansion would not create any adverse effects 5