Laserfiche WebLink
5. Environmental Analysis <br />AIR QUALITY <br />These impacts will not be addressed in the following analysis. <br />South coast Air Quality Management District Thresholds <br />Regional Significance Thresholds <br />CEQA allows for the significance criteria established by the applicable air quality management or air pollution <br />control district to be used to assess impacts of a project on air quality. The SCAQMD has established <br />thresholds of significance for air quality for construction activities and project operation as shown to Table <br />5.1-4: <br />Table 5,14 <br />SCA A D ReuLonal Mnificance Thresholds <br />Air Pollutant Construcfion Phase OperefionalPhase <br />Volable Oganic Cary aunds (VOC) 75 lbs/day 55 Ibs d y <br />Nitrogen Oxides 100 lbs/day 55 lbslda <br />Carbon Monoxide 550 lbs/day 550 lbs /da <br />Sulfur Oxides 150 lbs/day 10 lbsda <br />Particulates (PMJ 150 lbs/day 150 lb da <br />Fine particulates P 55 a <br />Ib � 55 lbs day <br />Source: SCAM 2007 <br />CO Hots of Thresholds <br />Localized CO impacts are determined based on the presence of congested intersections. The significance of <br />localized project impacts depends on whether the project would cause substantial concentrations of CO. A <br />project is considered to have a significant impact if project - related mobile- source emissions result in an <br />exceedance the California one -hour and eight -hour CO standards, which ch are: <br />1 hour = 20 parts per million <br />hour = 9 parts per million <br />Localized Significance Thresholds <br />The S CAQM D developed localized significance thresholds (LSTs) for emissions of No , CO, PM,(), and PM, <br />generated at the project site (off -site mobile- source emissions are not included the LT analysis. LSTs <br />represent the maximum emissions at a project site that are not expected to cause or contribute to an <br />exceedance of the most stringent federal or state AAQS, LSTs are based on the ambient concentrations of <br />that pollutant within the project S A and the distance to the nearest sensitive receptor. L T analysis for <br />construction is applicable for all projects of fire acres and less; however, it can be used as screening criteria <br />for larger projects to determine whether or not dispersion modeling may be required. The construction LSTs <br />for a one -acre project site with 1n S RA 17 for son itive receptors located within 25 meters (appro cimately 81 <br />feet) are shown in Table 5.1-5. <br />FafrbavenlLincoln and Santa C iron Interjection Modifications City of Santa Ana a Page 5. 1 -1 <br />Supplement to the Santa Ana Second Main Track Project EIR Resolution No. 2009 -034 <br />Page 61 of 130 <br />