PC-2025-16 - Laserfiche WebLink

Hana Japan Restaurant Project Initial Study/Mitigated Negative Declaration 52 May 2025 X. HYDROLOGY AND WATER QUALITY. Would the project: Potentially Significant Impact Less-Than- Significant 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 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; 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?     Discussion a, The following discussion provides a summary of the proposed project’s potential to violate ci-ciii. water quality standards/waste discharge requirements, alter the drainage pattern of the site resulting in erosion or siltation, increase the rate or amount of surface runoff in a manner which would result in flooding on- or off-site, contribute runoff water which would exceed the capacity of existing or planned stormwater drainage systems, or otherwise degrade water quality during construction and operation. Construction During the early stages of construction activities, topsoil would be exposed during ground- disturbance. Prior to overlaying the ground surface with impervious surfaces and structures, the potential exists for wind and water erosion to discharge sediment and/or urban pollutants into stormwater runoff, which could adversely affect water quality downstream. The SWRCB regulates stormwater discharges associated with construction activities where clearing, grading, or excavation results in a land disturbance of one or more acres. The City’s Municipal Regional Stormwater National Pollutant Discharge Elimination System (NPDES) permit, Permit Number CAS612008, requires applicants to show proof of coverage under the State’s General Construction Permit prior to receipt of any construction permits. The State’s General Construction Permit requires a Storm Water Pollution Prevention Plan (SWPPP) to be prepared for the site. A SWPPP describes Best