ARCHIVED REPORTS_DRAFT ENVIRONMENTAL IMPACT REPORT

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congestion at nearby intersections. Therefore,the proposed project would be consistent with City general plan traffic Policy C-P-2. Because construction-related vehicle trips associated with the project would not substantially degrade existing levels of service and would not increase congestion at nearby intersections,the project's construction traffic impacts would be less than significant. IMPACT Transportation and Circulation—Potential Increase in Long-Term Operational Traffic. The project 4.11.2 would generate 20 additional one-way employee passenger vehicle trips per day and less than one truck haul trip per day(approximately two truck haul trips per week). These trips represent less than 1.0%of existing traffic volumes on local roadways and would not decrease the LOS of these roadways. Therefore, long-term operational traffic impacts would be less than significant. Approximately 10 additional staff members would be needed to operate the WQCF at project buildout in 2020. These employees would generate approximately 20 one-way daily trips commuting to and from the WQCF on a daily basis. The increase in treatment capacity of the WQCF would also increase the amount of treatment byproducts (grit, screenings, and biosolids)produced at the WQCF. Waste screenings, grit, and biosolids generated by the WQCF are trucked to the Forward Landfill for disposal. Annually,the WQCF generates 104 cubic yards of waste screenings, 52 cubic yards of grit, and approximately 548 cubic yards of biosolids(Shannon,pers. comm.,2006). At WQCF buildout, estimated screenings, grit, and biosolids generation rates are assumed to increase proportionally to the increase in plant capacity from 9.87 million gallons per day(mgd)average dry-weather flow (ADWF)to 27 mgd ADWF (approximately 174%). Therefore,the proposed project would increase the generation rates of annual screenings, grit, and biosolids to 285 cubic yards of waste screenings, 142 cubic yards of grit, and approximately 1,502 cubic yards of biosolids. Assuming 12 cubic yards of solid waste per truckload, an additional 1,225 cubic yards of additional solid waste would require 102 one-way truck trips per year to the Forward Landfill(approximately two one-way trips per week). The California Integrated Waste Management Board(CIWMB)provides an average per-capita solid-waste disposal rate for business types including utilities like wastewater treatment plants(CIWMB 2004). Solid-waste disposal rates for utilities are estimated at 0.3 ton per employee per year. Using the waste disposal rate of 0.3 ton per employee per year for 10 employees, 3 tons of waste(or approximately 83 cubic yards)would be generated annually by these employees in 2020. Because it is assumed that trash removal from the WQCF occurs once per week,the relatively small increase in waste generated by these 10 additional employees would not increase the trash removal frequency at the WQCF,and no additional truck trips for employee trash disposal would be required. Overall,the project would generate 20 one-way employee passenger vehicle trips per day and less than one truck haul trip per day. These trips are less than 1.0% of existing traffic volumes on local area roadways and would not decrease the LOS of these roadways. Therefore,the proposed project would be consistent with City general plan traffic Policy C-P-2. Because total trips are less than 1.0%of existing traffic volumes on local area roadways and would not decrease the LOS of these roadways, long-term operational traffic impacts would be less than significant. EDAW Manteca WQCF and Collection System Master Plans EIR Transportation and Circulation 4-11.8 City of Manteca