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(anaerobic). A high-solids sludge centrifuge is then used to dewater the sludge, where it is subsequently taken to a <br /> local landfill for disposal. <br /> 3 PROJECT CHARACTERISTICS <br /> The proposed project would expand WQCF capacity from 9.87 to 27 mgd ADWF and construct new trunk sewers <br /> to accommodate growth planned for in the City's General Plan(2003). The project includes treatment plant <br /> improvements for both river and land-based wastewater effluent disposal based on current and future probable <br /> water quality discharge requirements and projected flows. <br /> The proposed project would construct treatment facilities to achieve compliance with water quality limitations <br /> including rapid mixing and flocculation tanks to address turbidity requirements, and a tertiary ultraviolet light <br /> disinfection treatment system to address wastewater reuse requirements. The proposed project would reach <br /> buildout via a two-phase, incremental expansion,with capacity increasing from 9.87 to 17.5 mgd(ADWF) in the <br /> first phase (Phase IV)and then from 17.5 to 27 mgd in the second phase (Phase V). The proposed increase in <br /> capacity would be accommodated using the City's long-term effluent disposal strategy of on-site land application, <br /> urban landscape irrigation, and river discharge. <br /> The proposed project would also involve the incremental construction of three new trunk sewers and <br /> improvements to the existing collection system. These elements are described in greater detail below. <br /> 3.1 PROPOSED TREATMENT PLANT IMPROVEMENTS <br /> The proposed project considers increasing the capacity of the WQCF by 17.13 mgd ADWF. This increase would <br /> provide an additional allocation of 2.52 mgd for the City of Lathrop and 14.61 mgd for the City of Manteca. This <br /> proposed expansion is consistent with adopted growth projections and adopted land use plans including the City <br /> of Manteca General Plan 2023. To achieve this proposed increase in WQCF capacity,the following physical <br /> improvements are proposed for the WQCF. All improvements,with the exception of the parallel 48-inch outfall <br /> pipe,would be located on-site,within the existing WQCF boundaries. <br /> Proposed improvements include: <br /> ► expanded influent pump station; <br /> ► one mechanical screen; <br /> ► seven aerated grit removal tanks; <br /> ► ten primary sedimentation basins; <br /> ► seven aeration basins; <br /> ► seven secondary clarifiers; <br /> ► nine secondary effluent filters (for tertiary treatment); <br /> ► two rapid mixing tanks and six flocculation tanks; <br /> ► UV disinfection facility including four UV channels and effluent pumps; <br /> ► new equalization pond for off-line storage and timed discharge; <br /> ► seven new dissolved air flotation units for waste activated sludge thickening; <br /> ► four new anaerobic sludge digesters, and sludge heating and cogeneration facilities; <br /> ► one new sludge dewatering centrifuge; <br /> ► odor control facilities; <br /> ► one new 48-inch outfall pipe; and <br /> ► a side bank outfall structure. <br /> 3.2 WASTEWATER EFFLUENT DISPOSAL OPTIONS <br /> The WQCF currently disposes of treated effluent through land application to City-owned property surrounding <br /> the WQCF or discharge to the San Joaquin River. At plant buildout,the City proposes to discharge treated <br /> effluent through a combination of on-site land application,urban landscape irrigation, and discharge to the San <br /> City of Manteca WQCF and Collection System Master Plan 2005 Update <br /> May 2006 6 Notice of Preparation <br />