ARCHIVED REPORTS_DRAFT ENVIRONMENTAL IMPACT REPORT

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3.3.3 PROJECT SCOPE The 2007 City of Manteca Wastewater Quality Control Facility Master Plan Update was finalized in January 2007, and the 2006 City of Manteca Wastewater Collection System Master Plan Update is in draft form,but with sufficient detail to allow environmental analysis. The master plans identify wastewater treatment and conveyance improvements to support development envisioned in the City general plan up to the secondary urban service boundary(buildout). City buildout is anticipated to occur by the year 2023. The Manteca WQCF and Collection System Master Plans Update Project considered in this EIR encompasses both the 2007 City of Manteca Wastewater Quality Control Facility Master Plan Update and the 2006 City of Manteca Wastewater Collection System Master Plan Update, as described further below. 3.4 PROJECT JUSTIFICATION The purpose of the 2007 City of Manteca Wastewater Quality Control Facility Master Plan Update and the 2006 City of Manteca Wastewater Collection System Master Plan Update are to provide the City with direction and policy guidance for planning future wastewater collection system and treatment facilities that are essential for meeting changing environmental regulations and future growth demands. The overall goal of the two plans is to provide a phased program of recommended conveyance systems and treatment facilities to accommodate planned growth while maintaining treatment reliability,meeting applicable regulatory requirements, and optimizing costs. In December 2005,wastewater flows at the City of Manteca WQCF averaged approximately 6.0 mgd ADWF. The existing permitted capacity of the WQCF is 9.87 mgd ADWF. Expected buildout ADWF within the areas served by the City of Manteca WQCF is 27 mgd. As wastewater flows and loads increase, additional conveyance system capacity and treatment facilities would be required.Also,potentially more restrictive future discharge requirements may require removal of specific pollutants. The existing City WQCF and collection system capacity is insufficient to accommodate the projected buildout of 27 mgd ADWF. 3.5 PROJECT OBJECTIVES The master planning process is intended to achieve the following primary objectives: ► provide sufficient conveyance and treatment capacity to meet projected growth within the City of Manteca's WQCF service area through the year 2023; ► provide for orderly and cost-effective expansion of City WQCF facilities and conveyance systems; ► comply with current water quality standards and provide flexibility to address changes in standards and regulations; and ► be sensitive to community concerns in relation to the planning, design, construction, and operation of City WQCF and collection system facilities and programs. 3.6 EXISTING TREATMENT PROGRAMS, PROCESSES, AND FACILITIES 3.6.1 WASTEWATER SERVICE AREA 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 a combined biofilter and activated-sludge wastewater treatment plant that is permitted for treatment and discharge of 9.87 mgd ADWF of wastewater. In accordance with a contractual agreement between the cities of Manteca and Lathrop, 8.42 mgd(or 85.3%)of plant capacity is allocated to the City of Manteca and 1.45 mgd(or 14.7%) is allocated to the City of Lathrop. EDAW Manteca WQCF and Collection System Master Plans EIR Project Description 3-8 City of Manteca