ARCHIVED REPORTS_DRAFT ENVIRONMENTAL IMPACT REPORT

Home Browse Search

more than one confirmed complaint per year averaged over a 3-year period or when there are three unconfirmed complaints per year averaged over a 3-year period(SJVAPCD 2002). Two situations increase the potential for odor problems. The first occurs when a new odor source is located near existing sensitive receptors. The second occurs when new sensitive receptors are developed near existing sources of odor. In the first situation, SJVAPCD recommends operational changes, add-on controls,process changes, or buffer zones where feasible to address odor complaints. In the second situation,the potential conflict is considered significant if the project site is at least as close as any other site that has already experienced significant odor problems related to the odor source. For projects locating near a source of odors where there is no nearby development that may have filed complaints, and for odor sources locating near existing sensitive receptors, SJVAPCD requires the determination of potential conflict to be based on the distance and frequency at which odor complaints from the public have occurred in the vicinity of a similar facility(SJVAPCD 2002). SJVAPCD has adopted Rule 4102, as identified above,that applies to odor emissions. In addition, San Joaquin County Ordinance 9-1025.4(Odor) and the City of Manteca Ordinance 17.13.040G and 17.13,030 apply to odor emissions. 4.3.2 ENVIRONMENTAL IMPACTS ANALYSIS METHODOLOGY Project-generated construction-related emissions of criteria air pollutants (e.g.,PMIo)and ozone precursors(ROG and NOx)were assessed in accordance with SJVAPCD-recommended methodologies from the following: SJVAPCD's GAMAQI, (SJVAPCD 2002), a comment letter submitted by SJVAPCD for the proposed project (SJVAPCD 2006d), correspondence between EDAW and SJVAPCD staff, and SJVAPCD's web site. Where quantification was required, emissions were modeled using SJVAPCD-recommended emission factors and methodologies. For instance, construction-related emissions of ROG and NOx were modeled using URBEMIS2002 Version 8.7.0(ARB 2005b). Construction-related emissions of fugitive PMIo dust were qualitatively assessed in accordance with SJVAPCD recommendations. Project-generated operation-related emissions of criteria air pollutant and ozone precursors were assessed based on the assumption that the increase in operations(e.g., flow rate)at the WQCF would be directly proportional to the increase in stationary source emissions. Emissions from area and mobile sources were modeled using URBEMIS2002 Version 8.7.0(ARB 2005b). Determinations of significance for short-term construction-related and long-term operation-related emissions were based on the comparison of project-generated emissions to SJVAPCD thresholds. All other air quality impacts (i.e., long-term operation-related local CO, odor, and TAC emissions)were assessed in accordance with ARB and SJVAPCD-recommended methodologies. Such methodologies include the use of SJVAPCD's screening level procedures and a qualitative assessment for the exposure of sensitive receptors to odor and TAC emissions. THRESHOLDS OF SIGNIFICANCE For purposes of this analysis,the following applicable thresholds of significance have been used to determine whether implementing the proposed project would result in a significant impact. These thresholds of significance are based on the State CEQA Guidelines and SJVAPCD (SJVAPCD 2002). The proposed project would result in significant air quality impacts if it would: ► conflict with or obstruct implementation of the applicable air quality plan, ► violate any air quality standard or contribute substantially to an existing or projected air quality violation, EDAW Manteca WQCF and Collection System Master Plans EIR Air Quality 4.3-18 City of Manteca