ARCHIVED REPORTS_DRAFT ENVIRONMENTAL IMPACT REPORT

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4.9 HYDROLOGY AND WATER QUALITY This section evaluates water quality conditions of ground and surface waters in the project vicinity and the project's potential impacts on these water resources. This evaluation uses existing information from previously completed documents that address water resources in the project vicinity. These documents are hereby incorporated by reference into this DEIR. Manteca General Plan Background Report(City of Manteca 1988). The Manteca General Plan Background Report is a supporting document to the City of Manteca General Plan that provides information on a range of topics(e.g.,traffic,utilities,public services,housing, land use)which describe the physical and socioeconomic characteristics of the city and planning area. The background report does not contain policies and is intended to provide information that assists in the production of general plan policies that implement the long-term vision of the City of Manteca(City). City of Manteca General Plan 2023 Draft Environmental Impact Report(City of Manteca 2003a). The Manteca General Plan 2023 DEIR is a program EIR for the City of Manteca General Plan 2023 (City general plan). The EIR provides information to the public and decision makers of the potential significant environmental impacts of the City general plan, indicates mitigation measures which may reduce or avoid potential significant environmental impacts, and identifies reasonable alternatives. The EIR was certified by the City on October 6, 2003. City of Manteca Storm Drain Master Plan (City of Manteca 2006). The City of Manteca maintains the existing city storm drain system, and expands the system as necessary as growth occurs. The City of Manteca Storm Drain Master Plan identifies the drainage facilities needed to meet the needs of the 2003 general plan, and includes a discussion of the existing system, outlines design criteria, and provides a detailed analysis of the storm drain system. The document also provides a summary of master plan improvements for each of the major city drain systems. City of Manteca Storm Water Management Program (City of Manteca 2003b). The City of Manteca prepared the City of Manteca Storm Water Management Program document to meet the requirements for coverage under General Permit Number CAS000004,Water Quality Order No. 2003-0005-DWQ to meet federal National Pollutant Discharge Elimination System(NPDES)permit requirements. The program will be implemented to limit the discharge of pollutants from the City of Manteca storm sewer system. The program includes information on public education and outreach, construction site stormwater runoff control, and pollution prevention for municipal operations. Near-and Far-Field Dilution Analysis of the Manteca Wastewater Discharge(RMA 2006). The dilution analysis report summarizes the results of a near-and far-field dilution analysis of the City of Manteca Wastewater Quality Control Facility(WQCF)discharge. The dilution analysis was completed using local and Deltawide versions of the 2-D depth-averaged models RMA 2 and RMA 11. The near field dilution simulations were performed for three river flow rates,three discharge rates, and two outfall scenarios. Far field tracer simulations were performed for 2 dry years and three discharge rates. This document is included as Appendix F. Antidegradation Analysis for Proposed Wastewater Quality Control Facility Discharge Modification (LWA 2007). This report documents the City of Manteca WQCF antidegradation analysis for a projected discharge increase in permitted discharge capacity to the San Joaquin River from 9.87 to 27 million gallons per day(mgd) average dry-weather flow(ADWF). The analysis is intended to provide the Central Valley Regional Water Resources Control Board(RWQCB)with the information needed to determine whether to certify that the proposed permitted discharge increase is consistent with state and federal antidegradation policies. The analysis is comprises two main components: (1) a comparison of the projected receiving water quality to the water quality objectives and/or criteria used to protect designated beneficial uses, and(2) a socioeconomic analysis to establish the balance between the proposed action and the public interest. This document is included as Appendix C. DEIR EDAW City of Manteca 4.9-1 Hydrology and Water Quality