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City of Pleasanton—Villages at the Quarry Project Consistency Checklist 15183 Consistency Checklist 150 According to the Federal Emergency Management Agency (FEMA) Flood Map for the area, the project site is mapped within Zone X—indicating an area of minimal flood risk.27 As detailed in the Preliminary Stormwater Control Plan, the proposed project is required to treat 100 percent of the runoff from impervious surfaces within the project site; this would be achieved by directing all runoff (i.e., roof, street, and driveway) to six proposed bioretention basins located throughout the project site. Landscaping would include planting several trees, which would improve water quality by intercepting and storing rainfall on leaves and branch surfaces thereby reducing runoff volumes and delaying the onset of peak flows. In addition, the uptake of water from trees through transpiration would reduce the amount of runoff from the project site. The landscaping design would be required to meet State standards for water efficiency. Therefore, there are no environmental effects that are peculiar to the proposed project. The proposed project would not result in a new or more severe adverse impact that was not previously identified in the Housing Element Update FEIR. (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; Summary of Housing Element Update FEIR The Housing Element Update FEIR indicated that new development consistent with the Housing Element Update could increase the total impervious area and increase stormwater runoff, which could exceed stormwater drainage facility capacity or create additional sources of polluted runoff. The Housing Element Update FEIR concluded that compliance with the General Plan policies and programs would maximize infiltration and rainwater retention, which would in turn reduce stormwater runoff. Additionally, all future development consistent with the Housing Element Update would be evaluated on a project-by-project basis for impacts to storm drain capacity. Further, new development would be required to pay its fair share of the storm drainage system improvement costs. Therefore, impacts related to 27 Federal Emergency Management Agency (FEMA). 2009. Flood Insurance Rate Map, Panel 336 of 608, Map Number 06001C0336G. Effective Date August 3, 2009.