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WOODARD &CURRAN 5.2.1 Water Shortage Contingency Plan As part of the UWMP process,all urban suppliers are required to prepare a water shortage contingency plan detailing how the supplier would manage supplies during water shortages of up to 50 percent. Should the City experience a water shortage or catastrophic supply interruption in the future,the City would enact more stringent water conservation measures and/or the appropriate stage of the City's Water Shortage Contingency Plan (as described in the City's UWMP) across the entire service area, including the Project area, to ensure demand does not exceed supply. In the event of catastrophic supply interruption due to a disaster such as an earthquake, major fire,flooding,or sabotage,the City maintains emergency standby generators at wells and pump stations to provide uninterrupted water supply. The City's 2015 UWMP includes additional details on the City's Water Shortage Contingency Plan (WSCP), including the following information: • A description of stages of action the City will take in response to a water supply shortage; • A description of non-essential water uses during a water shortage, and water use prohibitions, penalties, and consumption reduction methods; and • An analysis of revenue impacts due to reduced sales during shortages. The City is anticipated to have sufficient supplies to meet demands inclusive of the Project in dry years in all years except 2035 in a single-dry year scenario. This shortage would be met through the City's implementation of conservation programming and/or the WSCP. Because the shortage in 2035 is anticipated to be less than 10 percent, demands would be less than supply if the City were to implement Stage 1 of its WSCP. This would likely result in a corresponding 10 percent reduction in demand and make up for the shortages identified in the above table. Califia(0011533.00) 43 Woodard&Curran, Inc. River Islands Phase 2 Development Water Supply Assessment September 2020