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5. Environmental Analysis <br />AIR QUALITY <br />Table 5,1-5 <br />SCAQMD Localized Significance Thresholds <br />il�rslrold 1sd <br />Air Pollutant o frcrclio Opera #io ' <br />Carbon Monoxide (CO) 440 440 <br />Nitrogen Oxides (NOJ 139 139 <br />Coarse Particulates PM 4 1 <br />Fine Particulates (PM, J 3 1 <br />Source: SCAQM D 2003; SCAND 2006, for a 1 -acre site with receptors 82 feet 5 meters from the source <br />Greenhouse Gas Emission Thresholds <br />The SCAQMD, OPR, and CARB have not formally adopted regional emission thresholds for CHC emissions. <br />However, the SCAQMD is currently in the process of drafting thresholds for Coe emissions for construction <br />and operation of a project. According to the SCALD Working Croup the third proposed interim GHC <br />significance proposal (October 2006) is a decision tree approach. Residential /Commercial projects that <br />generate more than 3,600 ,metric tons per year and industrial projects that generate more than 7,066 metric <br />tons per year must undergo a more detailed analysis than those that generate less. <br />5.1.4 Environmental Impacts <br />The following impact analysis addresses thresholds of significance for which the Initial Study identified <br />potentially significant impacts. The applicable thresholds are identified in brackets after the impact statement. <br />IMPACT 5. 1-1: PR JEGT -REI TED SHORT-TERM CONSTRUCTION EMISSIONS WOULD NOT <br />EXCEED C i THRESHOLD CRITERIA OR CONTRIBUTE TO THE Om PM m OR <br />PM,,., .5 So NONATT I MENT DESIGATIONS. [THRESHOLDS A -2 AND A - ] <br />Impact Analysis: Construction activities produce combustion emissions from various sources, such as on- <br />sate heavy -duty construction vehicles, vehicles hauling materials to and from the site, motor vehicle <br />transporting the construction crew, and fugitive dust emissions. Air pollutant emissions from construction <br />activities on -site vwrouId vary daily as construction activity levels change. The primary sou roe of construction- <br />re lated CC, SC , Vo C, and N Ox emissions is gasoline- and diesel - powered, heavy -duty mobile construction <br />equipment, Primary sources of PM I. and PM 2,, emissions are clearing and demolition activities, excavation <br />and grading operations, construction vehicle traffic on unpaved ground, and wind blowing over exposed <br />earth surfaces. <br />Construction activities associated with the project would occur over 12 weeks, with construction activities at <br />the Fairhaven /Lincoln intersection taking 6 weeks and activities at Santa Clara /Lincoln intersection taking 6 <br />weeks. Construction emissions associated with demolition, construction, and paving activities were <br />estimated based on default construction equipment projections for a one -acre project site using the <br />URBEMIS200 ' model. Air pollutant emissions associated with the project are shown in Table 6.1 -6. As shown <br />construction emissions would not exceed the S CAQM D thresholds and no significant impacts would occur. <br />Page 3-1 a The Planning Center <br />Resolution No. 2009 -034 <br />Page 62 of 130 <br />March 2009 <br />