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City of Manteca Wastewater Quality Control Facility and Collection System Master Plans Update Project

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City of Manteca Wastewater Quality Control Facility and Collection System Master Plans Update Project Findings of Fact and Statement of Overriding Considerations for the City of Manteca Wastewater Quality Control Facility and Collection System Master Plans Update Project Prepared for: City of Manteca Prepared by: EDAW 2022 J Street Sacramento, CA 95811 January 2008 Findings of Fact and Statement of Overriding Considerations for the City of Manteca Wastewater Quality Control Facility and Collection System Master Plans Update Project Prepared for: City of Manteca 1001 West Center Street Manteca, CA 95337 Attn: Phil Govea Deputy Director of Public Works—Engineering (209) 239-8463 Prepared by: EDAW 2022 J Street Sacramento, CA 95811 Contact: Amanda Olekszulin Senior Project Manager (916) 414-5800 January 2008 P 05110088.01 1.31.08 TABLE OF CONTENTS Section Page ACRONYMS AND ABBREVIATIONS ............................................................................................................... ii 1 STATEMENT OF FINDINGS .................................................................................................................. 1-1 1.1 Introduction......................................................................................................................................... 1-1 1.2 Description of the Approved Project .................................................................................................. 1-2 1.3 Alternatives......................................................................................................................................... 1-2 1.4 Findings of Fact .................................................................................................................................. 1-5 2 STATEMENT OF OVERRIDING CONSIDERATIONS...................................................................... 2-1 2.1 Significant Unavoidable Adverse Impacts.......................................................................................... 2-1 2.2 Overriding Considerations.................................................................................................................. 2-3 3 REFERENCES ........................................................................................................................................... 3-1 Manteca WQCF and Collection System Master Plans EIR EDAW City of Manteca i Table of Contents ABBREVIATIONS AND ACRONYMS Term Definition ADWF average dry weather flow AFY acre-feet per year AIA Air Impact Assessment APCO Air Pollution Control Officer BMP best management practice Caltrans California Department of Transportation CEQA California Environmental Quality Act City City of Manteca City General Plan City of Manteca’s General Plan CPUC California Public Utilities Commission DFG Department of Fish and Game DTSC California Department of Toxic Substances Control EIR Environmental Impact Report EPA U. S. Environmental Protection Agency FCOC French Camp Outlet Canal JPA Joint Powers Authority LOS Level of Service MF microfiltration mgd million gallons per day MLD Most Likely Descendant NAHC Native American Heritage Commission NOI Notice of Intent NOX nitrogen oxides NPDES National Pollutant Discharge Elimination System OSHA U.S. Office of Safety and Health Administration PM10 respirable particulate matter PPV peak particle velocity EDAW Manteca WQCF and Collection System Master Plans EIR Table of Contents ii City of Manteca Term Definition proposed project Wastewater Quality Control Facility and Collection System Master Plans Update Project PSRs Project Study Reports RO reverse osmosis ROG reactive organic gasses RWQCB Central Valley Regional Water Quality Control Board SCSWSP South County Surface Water Supply Project SJCDEH San Joaquin County Department of Environmental Health SJCOG San Joaquin Council of Governments SJMSCP San Joaquin County Multi-Species Habitat Conservation and Open Space Plan SJVAB San Joaquin Valley Air Basin SJVAPCD San Joaquin Valley Air Pollution Control District SOI City’s Sphere of Influence SR 120 State Route 120 SSJID South San Joaquin Irrigation District SWPPP Storm Water Pollution Protection Plan SWRCB State Water Resources Control Board TAC toxic air contaminants Thermal Plan Water Quality Control Plan for Control of Temperatures in Coastal and Interstate Waters and Enclosed Bays and Estuaries of California tpy tons per year USACE U.S. Army Corps of Engineers USB Urban Services Boundary USFWS U.S. Fish and Wildlife Service UV ultraviolet VdB velocity decibels VDE visible dust emissions WDR Waste discharge requirement WER water effects ratio WQCF Wastewater Quality Control Facility Manteca WQCF and Collection System Master Plans EIR EDAW City of Manteca iii Table of Contents 1 STATEMENT OF FINDINGS 1.1 INTRODUCTION The City of Manteca proposes to adopt the WQCF and Collection System Master Plans Update Project (proposed project), which incorporates 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. The project would involve the expansion of the City’s Wastewater Quality Control Facility (WQCF) treatment capacity from 9.87 million gallons per day (mgd) to 27 mgd average dry weather flow (ADWF), construction of new trunk sewers to accommodate growth planned for in the City’s general plan (adopted in 2003), and construction of a recycled water distribution system. The proposed WQCF expansion and upgrades would primarily be located within the existing 22-acre WQCF site, and proposed wastewater collection system improvements would generally be located along the perimeter of the city. In accordance with the California Environmental Quality Act (CEQA) and the State CEQA Guidelines, an Environmental Impact Report (EIR) was prepared to evaluate the environmental effects of the project: Draft Environmental Impact Report for the City of Manteca Wastewater Quality Control Facility and Collection System Master Plans Update Project, July 2007, and Final Environmental Impact Report for the City of Manteca Wastewater Quality Control Facility and Collection System Master Plans Update Project, November 2007 (SCH # 2006052164). The environmental analysis contained in the EIR is based on an evaluation of how environmental conditions would be expected to change as a result of implementing the project. CEQA and the State CEQA Guidelines provide that: [N]o public agency shall approve or carry out a project for which an environmental impact report has been certified which identifies one or more significant effects on the environment that would occur if the project is approved or carried out unless both of the following occur: (a) The public agency makes one or more of the following findings with respect to each significant effect: (1) Changes or alterations have been required in, or incorporated into, the project which mitigate or avoid the significant effects on the environment. (2) Those changes or alterations are within the responsibility and jurisdiction of another public agency and have been, or can and should be, adopted by that other agency. (3) Specific economic, legal, social, technological, or other considerations, including considerations for the provision of employment opportunities for highly trained workers, make infeasible the mitigation measures or alternatives identified in the environmental impact report. (b) With respect to significant effects which were subject to a finding under paragraph (3) of subdivision (a), the public agency finds that specific overriding economic, legal, social, technological, or other benefits of the project outweigh the significant effects on the environment. [Public Resources Code Section 21081] Because the EIR identified significant effects that may occur as a result of the project and in accordance with the provisions of the State CEQA Guidelines, the City of Manteca hereby adopts these findings as part of the approval of the proposed project. Manteca WQCF and Collection System Master Plans EIR EDAW City of Manteca 1-1 Statement of Findings 1.2 DESCRIPTION OF THE APPROVED PROJECT The proposed project would involve the expansion of the WQCF’s treatment capacity from 9.87 mgd to 27 mgd ADWF, construction of new trunk sewers to accommodate growth planned for in the City’s general plan (adopted in 2003), and construction of a recycled water distribution system. The project would involve construction of treatment facilities to achieve compliance with water quality limitations including rapid mixing and flocculation tanks to address turbidity requirements and a tertiary ultraviolet (UV) light disinfection treatment system to address wastewater reuse requirements. The proposed project would reach buildout via a two-phase, incremental expansion, with capacity increasing from 9.87 to 17.5 mgd ADWF in the first phase, and then from 17.5 to 27 mgd ADWF in the second phase. The proposed increase in capacity would be accommodated using the City’s long-term effluent disposal strategy of on-site land application, urban landscape irrigation, and San Joaquin River discharge. The proposed project would also involve the incremental construction of three new trunk sewers and improvements to the collection system. The WQCF occupies approximately 22 acres of a 210-acre City-owned site, which is bounded generally by Yosemite Avenue to the north, SR 120 to the south, Airport Way to the east, and both McKinley Avenue and the Union Pacific Railroad to the west. The proposed WQCF expansion and upgrades would primarily be located within the existing 22-acre WQCF site. A proposed treated effluent
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