ARCHIVED REPORTS_DRAFT ENVIRONMENTAL IMPACT REPORT

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Stationary Source Emissions The latest data available from ARB for emissions of criteria pollutants and precursors associated with existing operations at the WQCF are shown in Table 4.3-3 above and reiterated below in Table 4.3-7 for the purposes of this discussion. Proposed improvements to the WQCF are in principal the expansion of the facilities and equipment to increase the capacity of the existing treatment processes. Therefore, it is reasonable to assume that the increase in stationary source emissions would be proportional to the proposed increase in wastewater flow and plant capacity. The 2004 average flow rate is estimated at 6 mgd, and the proposed maximum flow rate at completion of the proposed project is 27 mgd. Increases in stationary source emissions, shown in Table 4.3-6, are conservative; increases attributable to the proposed project would be less than shown because the base flow rate for this project would occur at the completion of Phase III improvements(i.e., 9.87 mgd). As shown in Table 4.3-6, increases in stationary source emissions of ROG and NOx would be less than 1 tpy. Table 4.3-7 Summary of Modeled Project-Generated Operation-Related (Regional) Emissions of Criteria Air Pollutant and Precursor Emissions Emissions Tons per Year Pollutant Stationary Source Area Mobile Total SJVAPCD Significance 20041 2020 Netlncrease Source Source Increase Threshold2 ROG 0.07 0.31 0.24 0.05 0.04 0.33 10 NOx 0.54 0.81 0.63 0.15 0.02 0.80 10 CO 0.18 2.43 1.89 0.12 0.23 2.24 - SO2 0.58 2.61 2.03 0 0 2.03 - PMIp <0.01 0.02 0.02 0 0.07 0.09 - PMZ 5 <0.01 0.02 0.02 3 3 3 - Refer to Table 4.3-3. 2 SJVAPCD has not adopted significance thresholds for CO,SO2,PM,o,or PM2.5. 3 URBEMIS does not calculate PM2,5;values would be less than PM,o values. Source:Data modeled by EDAW 2006. Area and Mobile Source Emissions Project-generated operation-related(regional)emissions of criteria air pollutants and precursors from area sources would include usage of natural gas and the application of architectural coatings. Emissions from mobile sources would include employee commute,material transport/delivery, and maintenance vehicle trips. As described in Section 4.11 "Transportation and Circulation",the proposed project would generate 20 one-way employee passenger vehicle trips per day and less than one truck haul trip per day from the increase in the number of employees traveling to and from the WQCF,delivery of additional supplies,removal of additional sludge, and routine maintenance and inspection activities. SJVAPCD has defined project sizes by land use type for which it has been determined,based on conservative assumptions that such would not result in emissions above the recommended significance thresholds. 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. However,because there would be stationary source emissions associated with the proposed project, as discussed above, area and mobile source emissions were modeled to ensure total emissions were accurately accounted for and compared in total to SJVAPCD's significance thresholds. Regional area- and mobile-source emissions of criteria air pollutants and precursors associated with implementation of the proposed project were estimated using URBEMIS 2002 Version 8.7.0 computer program, as recommended by SJVAPCD. Regional area-and mobile-source emissions were estimated based on proposed land use types and sizes identified in Section 3, "Project Description,"the increase in trip generation from the EDAW Manteca WQCF and Collection System Master Plans EIR Air Quality 4.3-22 City of Manteca