ARCHIVED REPORTS_DRAFT ENVIRONMENTAL IMPACT REPORT

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I INTRODUCTION In accordance with the California Environmental Quality Act(CEQA) and the State CEQA Guidelines,the City of Manteca(as lead agency)will be preparing an Environmental Impact Report(EIR)to evaluate the environmental effects associated with the proposed Manteca Wastewater Quality Control Facility(WQCF)2005 Master Plan Update and the 2005 Collection System Master Plan Update project(together known as the proposed project). The proposed project would: incrementally increase the treatment capacity of the WQCF from 9.87 million gallons per day(mgd)to 27 mgd average dry weather flow(ADWF), increase wastewater effluent discharges to the San Joaquin River,result in discharge of wastewater effluent on urban and agricultural lands, result in minor improvements to existing sewer lines, and result in construction of three new trunk sewers measuring a total of approximately 21 miles. The EIR will identify any significant environmental impacts of the project and recommend mitigation measures to reduce the project's environmental impacts where feasible. In accordance with Section 15082 of the CEQA Guidelines,the City of Manteca has prepared this Notice of Preparation to provide responsible and trustee agencies and other interested parties with information describing the project and the issue areas that will be evaluated in the EIR. 2 PROJECT LOCATION AND BACKGROUND 2.1 LOCATION The project would result in the construct of wastewater treatment facilities on City-owned property near downtown Manteca,and wastewater conveyance infrastructure in and around the City. Manteca is located at the northern end of the San Joaquin Valley of central California, at the junction of State Route(SR) 99 and SR 120, approximately 75 miles east of San Francisco and 55 miles south of Sacramento. The WQCF is located approximately 1.5 miles west of the City of Manteca in southern San Joaquin County. Exhibit 1 shows the project's regional location. Proposed wastewater conveyance infrastructure would be located along the SR 120 and SR 99 corridors and other roads surrounding the City. Regional access to the project is provided by Interstate 5 (1-5)to the west, SR 120 to the south, and SR 99 to the east. The street address for the WQCF is 2450 West Yosemite Avenue, and it includes Assessor Parcel Numbers 241-300-47,48,49, & 50 and 241-310-16, 18, 32,44,48, 52, 53, 57, & 58. Local roadways near the WQCF include Yosemite Avenue,Woodward Avenue,McKinley Avenue,Airport Way,and Union Road as shown in Exhibit 2. Local roadways in the vicinity of the proposed trunk sewers include Woodward Avenue,Lathrop Road, and Airport Way. 2.2 WQCF EXPANSION HISTORY The Manteca WQCF has expanded several times since operations began in 1959. From 1986-1988, a major expansion to the plant known as Phase I was constructed. The Phase I expansion project included the construction of secondary treatment facilities, anaerobic sludge digesters, sludge drying beds, a chlorine disinfection system, and an outfall to the San Joaquin River. Design capacity of the plant following the Phase I project was 5.45 mgd (ADWF). The Phase II expansion project constructed in 1992 and 1993 added a primary sedimentation basin, a secondary clarifier, and four sludge drying beds, increasing capacity to 6.95 mgd ADWF. The City's Wastewater Quality Control Facility Master Plan adopted August 21, 1995, identified Phase III improvements which included the construction of nitrification facilities(increasing plant capacity from 6.95 to 7.5 mgd ADWF), improved primary and secondary treatment facilities(increasing capacity from 7.5 to 9.87 mgd ADWF), and solids handling and tertiary filtration and ultraviolet(UV)disinfection facilities. The City has divided Phase III improvements into four schedules: A,B, C, and D. City of Manteca WQCF and Collection System Master Plan 2005 Update May 2006 1 Notice of Preparation