ARCHIVED REPORTS_DRAFT ENVIRONMENTAL IMPACT REPORT

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REGULATORY SETTING HYDROLOGY Groundwater Hydrology California groundwater law is extremely complicated because of the variety of groundwater rights recognized in the state. Groundwater is classified as either a subterranean stream or percolating groundwater.A subterranean stream exists when the flow of groundwater is confined to a known and defined subsurface channel. Groundwater not flowing as a subterranean stream is classified as percolating groundwater. Subterranean streams are subject to surface water law,which recognizes riparian and appropriative rights, and are regulated by the SWRCB. Percolating groundwater is subject to general court-enforced principles of groundwater law,which recognizes overlying and appropriative rights. This latter category of groundwater can be regulated by ordinances adopted at the local level but is generally not subject to SWRCB regulation or oversight. Groundwater underlying the City of Manteca is classified as percolating groundwater. Regional and Local Plans, Policies, Regulations, and Ordinances Sacramento and San Joaquin River Basins Comprehensive Study The Sacramento and San Joaquin River Basins Comprehensive Study is a joint effort by the State Reclamation Board and the U.S.Army Corps of Engineers (USACE), in coordination with federal, state, and local agencies, groups, and organizations in California's Central Valley,to develop a comprehensive plan for flood damage reduction and environmental restoration for the Sacramento and San Joaquin River basins. The comprehensive study is a regionwide planning effort and not a regulatory program; however, consistency with its goals and objectives is important for any project affecting flood control in the Sacramento—San Joaquin River basins. The proposed project site is located in the Lower San Joaquin River Region of the comprehensive study area. City of Manteca General Plan 2023 The City of Manteca General Plan 2023(City of Manteca 2003a)includes policies to maintain adequate service in the City's drainage system and to protect both surface and groundwater resources from contamination. The following policies are relevant to this analysis: Public Facilities and Services Element ► Policy PF-P-27: The City shall require the dedication and improvement of drainage detention basins as a condition of development approval according to the standards of the Drainage Master Plan. The responsibility for the dedication and improvement of detention basins shall be based on the prorated share of stormwater runoff resulting from each development. The Resource Conservation Element(Water Quality) of the City of Manteca General Plan provides policies to protect both surface and groundwater resources from contamination(City of Manteca 2003a). The following policies may be relevant to the project: ► Policy RC-P-11: Minimize pollution of waterways and other surface water bodies from urban runoff. ► Policy RC-P-12: Protect the quality of Manteca's groundwater. The City's General Plan also includes provisions that new industrial development with a significant potential to adversely affect San Joaquin River water quality or groundwater quality shall not be approved;that buffer areas between waterways and urban development shall be maintained to protect water quality and riparian areas; that DER EDAW City of Manteca 4.9-9 Hydrology and Water Quality