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City of Pleasanton—Hidden Canyon Residences and Preserve Draft EIR Executive Summary FirstCarbon Solutions ES-43 https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480016/EIR/3 - Draft EIR/21480016 Sec00-03 Exec Summary.docx Impacts Level of Significance Before Mitigation Mitigation Measures Level of Significance After Mitigation Impact HYD-2: The proposed project would not substantially decrease groundwater supplies or interfere substantially with groundwater recharge such that the project may impede sustainable groundwater management of the basin. Less than significant impact. None. Less than significant impact. Impact HYD-3: The proposed project would not 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 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. Less than significant impact. None. Less than significant impact. Impact HYD-4: The proposed project would not be located in a flood hazard zone, tsunami, or seiche zone, or risk release of pollutants due to project inundation. Less than significant impact. None. Less than significant impact. Impact HYD-5: The proposed project would not conflict with or obstruct implementation of a water quality control plan or sustainable groundwater management plan. Less than significant impact. None. Less than significant impact. Cumulative Impact Less than significant impact. None. Less than significant impact.