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ARROYO LAGO RESIDENTIAL PROJECT ADDENDUM FCS 143 Https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480036/Addendum/21480036 Arroyo Lago Residential Project Addendum.docx Zone 7 Stormwater Option The Zone 7 Stormwater Option would not result in any new or more severe hydrology or water quality impacts since it was considered in the Prior FEIR. Stormwater would continue to be treated through the proposed bioretention facilities in full compliance with applicable water quality standards and regulatory requirements, and the alternative would not introduce new pollutant sources or violate WDRs. Regarding groundwater, the option would not increase groundwater extraction or interfere with groundwater recharge, as stormwater management would remain consistent with the approved project design and applicable groundwater management plans. In terms of drainage patterns and runoff, this option would allow treated stormwater to discharge and drain naturally toward Cope Lake, rather than being conveyed through a detention basin, pump facilities, and storm drain force main; however, this change would not increase runoff volumes, alter drainage patterns in a manner that would cause erosion or flooding, or exceed the capacity of downstream drainage systems. This option would not increase flood risk or impede flood flows, as stormwater flows would remain within the hydrologic conditions evaluated in the Prior FEIR and would be subject to applicable erosion control and post-construction stormwater requirements. Finally, this option would not conflict with or obstruct implementation of a water quality control plan or sustainable groundwater management plan, as it would remain subject to all applicable City, RWQCB, and Zone 7 requirements, as discussed in the Prior FEIR. Accordingly, hydrology and water quality impacts associated with the Zone 7 Stormwater Option would remain less than significant and consistent with the conclusions of the Prior FEIR. Mitigation Measures None. Conclusion There is no new information of substantial importance, changes in the project, or changes in circumstances under which it will be undertaken, identifying new significant effects, nor is there a substantial increase in the severity of previously identified significant impacts related to hydrology and water quality. The conclusions from the Prior FEIR remain unchanged when considering the implementation of the proposed project. No further environmental review is required.