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Administrative Draft Environmental Impact Report Gill Medical Center Project protection of adopted flood control plans that will best protect the public from floods.The area of CVFPB jurisdiction includes the entire Central Valley, including all tributaries and distributaries of the Sacramento and San Joaquin rivers and Tulare and Buena Vista basins. 4.12.5 Environmental Impacts and Mitigation Measures 4.12.5.1 Thresholds of Significance The following thresholds of significance are based on Appendix G of the CEQA Guidelines. For purposes of this draft EIR, implementation of the proposed project would have a significant adverse impact on hydrology and water quality if it would result in any of the following: Violate any water quality standards or waste discharge requirements or otherwise substantially degrade surface or ground water quality; Substantially decrease groundwater supplies or interfere substantially with groundwater recharge such that the project may impede sustainable groundwater management of the basin; Substantially alter the existing drainage patterns 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 off-site; 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; or iv. Impede or redirect flood flows; In flood hazard, tsunami, or seiche zones, risk release of pollutants due to project inundation; Conflict with or obstruct implementation of a water quality control plan or sustainable groundwater management plan. 4.12.5.2 Methods of Analysis The assessment of potential impacts presented below is based on comparison of the existing site setting, as defined above in Section 4.12.1, with defined or anticipated conditions that would occur as a result of the proposed Project.Where available, Project specific studies provided by the applicant are used to identify Project-related conditions. In the absence of such documentation, available information from the relevant regulatory agency (for example, the RWQCB) are used to assess the potential difference between existing, or baseline, conditions and Project-related conditions. Hydrology and Water Quality 4.12-19 October 2021