2009-034 (2) - Final Supplemental Environmental Impact Report for Fairhaven/Lincoln

Home Browse Search

5. Environmental Analysis AIR QUALITY IMPACT . T- : INTERSECTION ECTIO MODIFICATIONS WOULD NOT EXPOSE SENSITIVE RECEPTORS TO SUBSTANTIAL POLLUTANT T ONCENTRATI l S. [THRESHOLD AGE-4] Impact Analysis: Because CO is produced in greatest quantities from cars and trucks and does not readily disperse into the atmosphere, adherence to AA QS is typically demonstrated through are analysis of localized CO concentrations. Areas of vehicle congestion have the potential to create pockets of CO called hot spas. These pockets could exceed the state one -hour standard of 20 ppm or the eight -hour standard of 9 ppm. Federal levels for one- and eight -hour standards of 35 and 9 ppm, respectively. Thus, an a ceedance condition would occur based on the state standards before the federal standards. Hot spas are typically produced at intersections, where traffic congestion is highest because vehicles are backed up waiting to pass through the intersection and are subject to reduced speeds. Typically, for an intersection to have a significant CO concentration, it would operate at level of service (LOS) E or worse. The intersection modification project would not change existing traffic patterns so it would not result in hot spots with concentrated air pollutants. According to the traffic study all intersections are currently operating at Lo D or better DMJM Harris 2008). The project would not change existing traffic conditions; therefore, the proposed project wouId not exceed any of the state one -hour or eight -hour CO AA S. Sensitive receptors in the area would not be adversely affected by CO emissions from project- related traffic redistribution. Localized air quality impacts related to mobile - source emissions would be less than significant. IMPACT 5.1 : PRCUE T- RELATED GREENHOUSE GAS EMISSIONS WOULD NOTSIGNIFICANTLY CONTRIBUTE TO GLOBAL CLIMATE CHANGE IMPACTS IN CALIFORNIA. [THRESHOLD A Q-61 Impact Analysis: The 2002 EIR did not evaluate global climate change impacts because the framework for analyzing this impact was not available when the 2002 EIR was published. Global climate change is not confined to a particular project area and is generally accepted as the consequence of global industrialization over the last 200 years. A typical project, earn a very large one, does not generate enough greenhouse gas emissions on its own to influence global climate change significantly; hence, the issue of global climate change is, by definition, a cumulative environmental impact. The project would generate G HG emissions frorn short -terra construction activities but wou ld not generate long -term emissions. Coe emissions from project - related construction activities were calculated by URBEMIS2007 and are shown in Table .1 -3, Approximately 35 tons of Coe would be produced by project construction. The total amount of CO, emissions generated by equipment over the course of the construction phase would not be substantial or exceed the SCAQMD draft interim~ screening thresholds. Impacts associated with GHG emissions generated by the project would be less than significant. Table 5.1-8 Project-Related Greenhouse Gas Emissions Source CO, emissions Construction Aotivites - 2099 35 tons AND Daft interim Screening Threshold 3,990 tons Significant? No Source: Ufi0E IS 007, Version 9.2.4 Page .1 -14 + The Planning Center Resolution No. 2009 -034 Page 64 of 130 March 2009