Environmental Impact Statement - Sonoma Land Trust

California Department of Fish and Game
U.S. Fish and Wildlife Service
Section 3.11. Air Quality
Action Alternatives
Impact AQ-1: Increase in Criteria Pollutant Emissions as
a result of Construction
Proposed Project
Although the 1999 BAAQMD Guidelines do not require the quantification of
construction emissions, they have been quantified for this analysis to achieve a
better understanding of the likely approximate level of construction-related
emissions generated by project conditions and to provide decision makers with
this information. Construction emissions impacts have been assessed in this
analysis using the URBEMIS 2007 9.2.4 computer program and an inventory of
anticipated construction equipment that will be used during construction
activities, which was provided by the project design team. Construction is
anticipated to start in the summer of 2012 and would last for approximately two
to three years. Most restoration phases would be implemented sequentially.
The estimated emissions assume standard factors for emissions of particulate
matter and other criteria air pollutants. It should be noted that much of the site
activities will consist of excavating and placing wet soils from the pilot channels.
Thus, use of the standard emission factors is likely to result in an overestimate of
the level of particulate matter (PM10 and PM2.5) emissions.
Construction of the Project would result in the temporary increase in emissions
of ROG, NO x , CO, PM10, PM2.5, and CO 2 . The URBEMIS model outputs both
unmitigated and mitigated emissions. Total estimated annual unmitigated and
mitigated project emissions resulting from construction of the Project in 2011
through 2013 are summarized in Tables 3.11-5 through 3.11-7. The air quality
analysis entailed estimating the increase in emissions using information on the
types of construction equipment (including total operating hours and horse
power) identified by the project design team.
Sears Point Wetland and Watershed Restoration
Project Final Environmental Impact
Report/Environmental Impact Statement
3.11-18
April 2012