ARCHIVED REPORTS_DRAFT ENVIRONMENTAL IMPACT REPORT

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of existing traffic volumes on local area roadways and would not decrease the LOS of these roadways. In addition, as described above,the proposed project would be defined as a small project(e.g., generates less than 1,000 trips per day)for which no quantitative analysis would be required. Project-generated,long-term operation- related(local)mobile-source emissions of CO would not violate or contribute substantially to a violation of the CAAQS or NAAQS, or expose sensitive receptors to substantial pollutant concentrations. This impact would be less than significant. IMPACT Air Quality—Exposure of Sensitive Receptors to Odors. The WQCF is known to produce odors and 4.3-5 there has been at least one confirmed compliant per year over a three year period. While the design of the project incorporates all feasible odor control technologies to reduce project-generated odors, it is unknown whether these technologies would limit odor complaints to less than one per year, which is the significance standard used by the SJVAPCD for significant odor problems. No other feasible odor control technologies are available to reduce the intensity of odors at the WQCF site and that would guarantee that odor complaints would be limited to one per year. Therefore, this impact would be significant and unavoidable. SJVAPCD has determined some common types of facilities and screening trigger level distances that have been known to produce odors, including wastewater treatment facilities, for which the screening distance is 2 miles. Odors from domestic wastewater are typically a result of anaerobic biological activity in the sewer collection and wastewater treatment systems. Any actions related to odors are based on citizen complaints to local governments and SJVAPCD. According to SJVAPCD, significant odor problems occur when there is 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). With respect to the WQCF,there has been at least one confirmed complaint in each of the years 2003 through 2005;therefore the WQCF is considered a significant odor source. As described in Section 3,"Project Description,"there currently is an odor control biofilter installed at the WQCF and implementation of the proposed project would result in the installation of two additional biofilter systems. Biofilter systems utilize bacteria to remove the majority of odor compounds without the need to use large quantities of chemicals. Foul air is blown through the bottom of the soil filter through a distribution system or perforated pipe, and as the air comes in contact with the bacteria,hydrogen sulfide and other odor compounds are consumed. The sludge drying beds, a present source of some odor complaints,would be eliminated with buildout of the WQCF. These improvements would reduce the potential for the exposure of sensitive receptors to odors. However, it is unknown whether these improvements would limit odor complaints to one per year averaged over a 3-year period.No other feasible odor control technologies are available to reduce the intensity of the odors generated at the WQCF site and that would guarantee that odor complaints would be reduced to one per year. This impact would be significant and unavoidable. 4.3.3 MITIGATION MEASURES No mitigation measures are necessary for the following less-than-significant impacts: 4.3-2: Generation of Long-Term Operation-Related (Regional) Emissions of Criteria Air Pollutants and Precursors. 4.3-3: Exposure of Sensitive Receptors to Toxic Air Contaminant Emissions. 4.3-4: Generation of Long-Term Operation-Related (Local) Mobile-Source Emissions of Carbon Monoxide. The following mitigation measures are provided for the significant impacts of lmpact 4.3-1: Manteca WQCF and Collection System Master Plans EIR EDAW City of Manteca 4.3-25 Air Quality