Draft Environmental Impact Report - California Off Highway Vehicle ...

3.2 Air Quality
Substitute electric‐ or gasoline‐powered equipment for diesel‐powered equipment,
when feasible.
Use alternatively fueled construction equipment on site, such as compressed natural
gas, liquefied natural gas, propane, or biodiesel, when feasible.
Use equipment that has low‐emission diesel engines, when feasible.
Emissions of criteria pollutants and ozone precursors (ROG and NOX) were calculated for the
anticipated construction years using information provided by the OHMVR Division (Appendix B)
and default assumptions provided in URBEMIS2007 (Appendix C). Table 3.2‐5 shows that the
Butte County AQMD’s project emissions thresholds would not be exceeded during any year of
construction. Thus, construction‐related emissions of criteria air pollutants would be less than
significant.
TABLE 3.2­5. MAXIMUM DAILY UNMITIGATED AIR EMISSIONS FROM GENERAL PLAN
CONSTRUCTION BY YEAR
Source
First Year of Construction Emissions 2
Construction Emissions (lbs/day) 1
ROG NOX CO PM10 PM2.5
Total unmitigated emissions 2.74 22.02 12.78 21.08 5.17
Butte County AQMD significance threshold 25 25 – 80 –
Exceeds threshold? No No N/A No N/A
Second Year of Construction Emissions 2
Total unmitigated emissions 3.52 24.03 19.41 11.28 3.03
Butte County AQMD project significance
threshold 3
25 25 – 80 –
Exceeds threshold? No No N/A No N/A
Notes: – = not established; lbs/day = pounds per day; CO = carbon monoxide; N/A = not applicable; NOX = oxides of
nitrogen; PM10 = particulate matter less than or equal to 10 microns in diameter; PM2.5 = particulate matter less than
or equal to 2.5 microns in diameter; ROG = reactive organic gases; SOX = oxides of sulfur.
Refer to Appendices B and C of this DEIR for detailed project assumptions and modeling output files.
1 Emissions modeled using the URBEMIS2007 (Version 9.2.4) computer model, incorporating required fugitive dust
control measures from Butte County AQMD Rule 205, “Fugitive Dust Emissions” as part of the unmitigated
condition due to inclusion of OM Guideline 6.3. In general, implementation of OM Guidelines are included as part of
the unmitigated condition.
2 Summertime and wintertime construction emissions are identical, and no seasonal distinction is made.
3 Corresponds to Butte County AQMD’s Level B threshold (Butte County AQMD 2008:2‐2).
Source: Data modeled by AECOM in 2011
Toxic Air Contaminant Emissions
According to the CEQA Air Quality Handbook, a project may result in a significant impact related to
TACs if it is close to sensitive receptors and has the potential to emit TACs (Butte County AQMD
2008:2‐3). For CEQA purposes, a sensitive receptor is generically defined as a location where
Clay Pit State Vehicular Recreation Area
Draft EIR 3.2-11 February 2012