ARCHIVED REPORTS_DRAFT ENVIRONMENTAL IMPACT REPORT

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Schedule A and B improvements have been completed. Schedule A improvements included two new aeration basins,three modified secondary clarifier sludge collection mechanisms,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 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 biofilters,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 C improvements,which are scheduled to begin construction in February 2007, include a sludge control building, a mechanical dewatering facility, and a shop maintenance building. Schedule D improvements are anticipated to be constructed and operational by March 2007 while Schedule C improvements are anticipated to be constructed and operational by July 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. Beyond the Phase III expansion,the City has identified the need to program future facilities to accommodate growth planned for in its General Plan. As such,the City has prepared its 2005 WQCF Master Plan. This master plan contemplates providing the necessary treatment facilities to accommodate up to 27 mgd ADWF. 2.3 COLLECTION SYSTEM PLANNING HISTORY 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,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 fixture growth areas. The 1993 Master Plan proposed construction of north and south trunk sewers to accommodate new service areas,with central and southwest sewers connecting the two. On October 6,2003,the City adopted a new General Plan(City of Manteca General Plan 2023 Policy Document) which identified areas to be developed within the City to the year 2023. The new General Plan 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 new General Plan,the City developed the City of Manteca Wastewater Collection System Master Plan Update in July 2005 (subject of this NOP). 2.4 EXISTING FACILITIES The Manteca WQCF and collection system serves commercial and residential uses within the City of Manteca, a portion of the City of Lathrop, and one frozen food packager(Eckert Cold Storage). The WQCF is permitted for treatment and discharge of 9.87 mgd ADWF of wastewater,with 8.42 mgd(or 85.3%) capacity allocated to the City of Manteca and 1.45 mgd(or 14.7%)allocated to the City of Lathrop. The existing wastewater collection system consists of 6-to 36-inch diameter gravity flow pipes, 6-to 18-inch diameter force mains, and 11 wastewater pump stations. The majority of the collection system serves the core of the City(i.e.,the central trunk sewer shed),which is approximately bound by SR 120 to the south,Austin Road to the east,Lathrop Road to the north, and Airport Way to the west. Several residential subdivisions located on the perimeter of the City or beyond the central trunk sewer shed have installed temporary wastewater pump stations and facilities to connect to the central trunk shed. The majority of the collection system within the central trunk sewer shed flows by gravity to the Union Road pump station(located at the intersection of Union Road and Center Street). Downstream of the Union Road pump station,wastewater flows to the WQCF by gravity via a 36- inch diameter sewer. City of Manteca WQCF and Collection System Master Plan 2005 Update May 2006 4 Notice of Preparation