COMPLIANCE INFO_FINAL INITIAL STUDY/MITIGATED NEGATIVE DECLARATION 5/25

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North County Recycling Center and Sanitary Landfill Permit Revision Project Final Initial Study/Mitigated Negative Declaration · San Joaquin County | May 2025 48 4.2.10 Hydrology and Water Quality Would the project: Potentially Significant Impact Less-than- Significant Impact with Mitigation Incorporated Less- than- Significant Impact No Impact a) Violate any water quality standards or waste discharge requirements or otherwise substantially degrade surface or ground water quality? b) Substantially decrease groundwater supplies or interfere substantially with groundwater recharge such that the project may impede sustainable groundwater management of the basin? c) 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 off-site; iii) create or contribute runoff water that would exceed the capacity of existing or planned storm water drainage systems or provide substantial additional sources of polluted runoff; or iv) impede or redirect flood flows? d) In flood hazard, tsunami, or seiche zones, risk release of pollutants due to project inundation? e) Conflict with or obstruct implementation of a water quality control plan or sustainable groundwater management plan? ENVIRONMENTAL SETTING As discussed above in Biological Resources, no wetlands are located in the project area, although there is a sedimentation basin on the eastern boundary of the project area, which receives stormwater runoff from the project site. There is also a mitigation area north of the landfill connecting to South Paddy Creek, which ultimately flows to Bear Creek then both the San Joaquin River and the California Delta.