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Hana Japan Restaurant Project Initial Study/Mitigated Negative Declaration 54 May 2025 areas and tree openings. Silva cells are landscaping areas with lightly compacted soil intended to grow large trees and treat stormwater on location. The collected stormwater would be treated by filtering runoff through an active layer of soil to remove pollutants. The proposed project would include six-inch storm drainage pipes to convey the treated stormwater to the existing City system. Each bio-retention area would be sized to adequately handle all runoff from the proposed impervious surfaces within the project site. Thus, the proposed project would comply with the requirements of the SWRCB and the Regional Water Quality Control Board (RWQCB) and would meet C.3 Standards related to stormwater treatment. During operation, the project would comply with all relevant water quality standards and waste discharge requirements, and would not degrade water quality. Conclusion Based on the above, the proposed project would not result in the violation of water quality standards or 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. Therefore, a less-than-significant impact would occur. b,e. Water supplies in the City of Pleasanton are provided by the City using water purchased from Zone 7 of the Alameda County Flood Control and Water Conservation District (Zone 7 Water Agency). The City owns and operates three active groundwater wells and a water distribution, pumping, and storage system divided into a number of water pressure zones. Pursuant to the Zone 7 Water Agency’s 2023 Annual Consumer Confidence Report, the majority of the water supply originates as Sierra Nevada snowmelt and is conveyed through the Delta and then by the South Bay Aqueduct.32 Other water supply sources include surface water from rain runoff stored in Lake Del Valle and groundwater pumped from the aquifer underlying the Livermore-Amador Valley. Typically, the Zone 7 Water Agency’s water supply is comprised of approximately 60 to 80 percent surface water and 20 to 40 percent groundwater each year. The amount of each type of source water varies depending on precipitation, location, and other conditions. In 2023, the Zone 7 Water Agency delivered approximately 95 percent treated surface water and five percent groundwater, allowing the groundwater basin to recharge after years of drought. Bulletin 118 – Interim Update 2016 defines 517 groundwater basins and subbasins in California. Pursuant to the Sustainable Groundwater Management Act (SGMA), the Department of Water Resources (DWR) is required to prioritize the 517 groundwater basins and subbasins as either High, Medium, Low, or Very Low. Prioritization is based on the following considerations: • The population overlying the basin or subbasin; • The rate of current and projected growth of the population overlying the basin or subbasin; • The number of public supply wells that draw from the basin or subbasin; • The total number of wells that draw from the basin or subbasin; 32 Zone 7 Water Agency. 2023 Annual Consumer Confidence Report. Available at: https://www.zone7water.com/post/annual-water-quality-reports. Accessed September 2024.