ARCHIVED REPORTS_DRAFT ENVIRONMENTAL IMPACT REPORT

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Additional WQCF capacity increases were considered in the 1995 City of Manteca Wastewater Quality Control Facility Master Plan. The 1995 WQCF Master Plan contemplated further expansion projects, including the Phase III and IV expansion projects (now referred to as the"Phase III improvements"). The Phase III improvements included the construction of nitrification facilities(increasing plant capacity from 6.95 to 7.5 mgd ADWF), improving primary and secondary treatment facilities including denitrification(increasing capacity from 7.5 to 9.87 mgd ADWF),and constructing wastewater filtration and ultraviolet(UV)disinfection facilities for tertiary treatment. Several Phase III improvements have been completed. The City has divided Phase III improvements into four schedules: A,B, C, and D. Schedule A and B improvements have been completed. Schedule A improvements included two new aeration basins,three modified mechanisms for secondary clarifier sludge collection,two new centrifugal blowers, and a skid-mounted centrifugal dewatering system. Schedule B improvements included a new influent pump station,two aerated grit tanks,three primary sedimentation basins, five aeration basins,two secondary clarifiers, an odor control biofilter, and an expanded laboratory and administration building. Schedule C improvements,which are scheduled to begin construction in August 2007, include a sludge-control building, a mechanical dewatering facility, and a shop maintenance building. Schedule D improvements are currently being constructed at the WQCF. Schedule D improvements include a secondary effluent equalization pond, a filter-feed pump station, coagulation and flocculation facilities,tertiary filters, a chemical storage and handling facility, a UV disinfection system, an effluent pumping station,two odor control biofllters,recycled water pumping stations, a groundwater well, and a construction truck recycled water filling station. Schedule D improvements will allow for the off-line storage and timed discharge of treated effluent to the San Joaquin River. Schedule D improvements are anticipated to be constructed and operational by September 2007 while Schedule C improvements are anticipated to be constructed and operational by December 2008. It is anticipated that Phase III improvements would satisfy the City's wastewater treatment capacity demands for the next 5-10 years, depending on the buildout rate of proposed development. In support of a new general plan(the City of Manteca General Plan 2023 [City general plan], adopted in October 2003)and an updated facilities plan(the 2003 City of Manteca Public Facilities Implementation Plan),the City developed the 2007 City of Manteca Wastewater Quality Control Facility Master Plan Update. The 2007 WQCF master plan discusses improvements needed to collect,treat, and discharge up to 27 mgd ADWF. 3.3.2 COLLECTION SYSTEM In 1989,the City developed the City of Manteca Sewer System Master Plan to address the 10-year planning period from 1989 to 1999 using information from the City's 1988 general plan. A 1993 master plan known as the Sewer Master Plan for the City of Manteca Public Facilities Implementation Plan, addressed the 21-year planning period from 1993 to 2014 and focused on future growth areas. The 1993 sewer master plan proposed construction of north and south trunk sewers to accommodate new service areas,with central and southwest sewers connecting the two. The City general plan identified areas to be developed within the City to the year 2023, and expanded the collection system service areas(to be served by the north and south trunk sewers)beyond the service areas identified in the 1993 Master Plan. As a result,the north and south trunk sewers would need to be enlarged to accommodate increased wastewater flows. To ensure that the City's collection system can adequately meet the development goals adopted in the 2003 General Plan,the City developed the City of Manteca Wastewater Collection System Master Plan Update in August 2006. This collection system master plan is also the subject of this EIR. Manteca WQCF and Collection System Master Plans EIR EDAW City of Manteca 3-7 Project Description