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Environmental Checklist Hydrology and Water Quality <br /> Initial Study – Mitigated Negative Declaration 59 <br />the water delivered by EBMUD originates from the Mokelumne River watershed, which is fed <br />primarily from the melting snowpack of the Sierra Nevada. The remaining 10 percent originates as <br />runoff from the protected watershed lands and reservoirs in the East Bay Hills (San Leandro <br />2016e).Therefore, the project would not rely on groundwater for its water supply and would not <br />increase groundwater usage such that a net deficit in aquifer volume would occur. <br />Development under the project does not include installation of new groundwater wells, or use of <br />groundwater from existing wells. Therefore, the project would have a less than significant impact on <br />groundwater supplies. <br />The project site is currently almost entirely paved with impervious surfaces. The project would <br />reduce the amount of impervious surfaces on the project site by approximately 4,150 square feet, <br />which would incrementally increase the potential for groundwater recharge. Therefore, the project <br />would not substantially interfere with groundwater recharge. Impacts related to groundwater <br />would be less than significant. <br />LESS THAN SIGNIFICANT IMPACT <br />d. Would the project substantially alter the existing drainage pattern of the site or area, including <br />the course of a stream or river, or substantially increase the rate or amount of surface runoff in <br />a manner that would result in flooding on- or off-site? <br />e. Would the project create or contribute runoff water that would exceed the capacity of existing <br />or planned stormwater drainage systems or provide substantial additional sources of polluted <br />runoff? <br />The project area is currently developed, and construction of the project would not alter the course <br />of any creek, stream or river (no surface water features are identified in the project area). The <br />project site is almost entirely covered in impervious surfaces. The project would reduce the amount <br />of impervious surfaces on the project site by approximately 4,150 square feet. The project would <br />also include bioswales to treat roof, sidewalk, and driveway water runoff. Therefore, additional <br />stormwater percolation may occur onsite and stormwater runoff volumes would incrementally <br />decrease. Therefore, the project would not increase stormwater discharge, substantially alter <br />drainage patterns onsite or the surrounding area, and would not contribute runoff that would <br />exceed the capacity of the existing onsite or offsite stormwater drainage system. Impacts would be <br />less than significant. <br />LESS THAN SIGNIFICANT IMPACT <br />g. Would the project place housing in a 100-year flood hazard area as mapped on a federal Flood <br />Hazard Boundary, Flood Insurance Rate Map, or other flood hazard delineation map? <br />h. Would the project place structures in a 100-year flood hazard area that would impede or <br />redirect flood flows? <br />The project is located outside of the 100-year FEMA-designated floodplain of the Estudillo Canal and <br />does not propose the development of housing (San Leandro 2016c). Therefore, the project would <br />not place structures inside a 100-year flood hazard area and there would be no impact. <br />NO IMPACT <br />356