Reso23-02 0009 PC Reso Adopt CEQA

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Findings and Statements Required by the California Environmental Quality Act Focused General Plan Update 16 Final Environmental Impact Report January 2023 4.10. Hydrology and Water Quality Impact HYD-1: The proposed Project would not violate any water quality standards or waste discharge requirements or otherwise substantially degrade surface or groundwater quality. The City’s existing development review process evaluates proposed private projects against water quality and permitting requirements of the affected federal, state, and regional agencies such as the San Francisco Bay Region National Pollution Discharge Elimination System (NPDES) Municipal Separate Storm Sewer System (MS4) Permit and the San Mateo Countywide Water Pollution Prevention Program (SMCWPPP), which address water quality, waste discharge, or stormwater requirements by requiring jurisdictions to reduce discharge of polluted runoff. Continued implementation of adopted General Plan goals, policies and programs, and the City’s development review process, would ensure that potential impacts on local and regional water quality from future development facilitated by the Project would be reduced to less than significant levels. Therefore, the Project would not violate any water quality standards or waste discharge requirements or otherwise substantially degrade surface or ground water quality, and this impact would be less than significant. (Draft EIR, pp. 4.10-17 to 4.10-18) Impact HYD-2: The proposed Project would not substantially decrease groundwater supplies or interfere substantially with groundwater recharge such that the Project may impede sustainable groundwater management of the basin. The City has not historically used groundwater as a potable water source, and groundwater is not currently used as a municipal source of water in the Planning Area, although the City is currently evaluating groundwater as a potential future emergency or back-up supply source. However, much of the development associated with implementation of the Project is anticipated to result in minimal increases in new impervious areas that would is not be expected to interfere substantially with groundwater recharge. Therefore, because the Project would not substantially decrease groundwater supplies or interfere substantially with groundwater recharge such that the Project may impede sustainable groundwater management of the basin, this impact would be considered less than significant. (Draft EIR, pp. 4.10-18 to 4.10-19) Impact HYD-3: The proposed Project would not substantially alter the existing drainage pattern of the site or area, including through the alteration of the course of a stream or river or through the addition of impervious surfaces, in a manner which would; (i) result in substantial erosion or siltation on-or off-site; (ii) substantially increase the rate or amount of surface runoff in a manner which would result in flooding on-or offsite; (iii) create or contribute runoff water which would exceed the capacity of existing or planned stormwater drainage systems or provide substantial additional sources of polluted runoff. Implementation of the Project would generally continue existing development trends and patterns, which include an overall urban and suburban development pattern, and would not be expected to significantly change that pattern. In addition, the system of drainage and flood control channels would likely remain similar to existing conditions. Changes to site-specific drainage conditions would be evaluated in the CEQA and planning review processes to determine the most appropriate way to accommodate existing drainages. Future development facilitated by the Project would be required to be consistent with federal, state, and local regulations regarding drainage channel design and operation, runoff retention, and stormwater treatment. Continued