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. Attachment 3 <br /> challenges to the Monterey Amendment to the <br /> SWP Contracts,which include the water banking <br /> programs in Kern County.Water quality issues <br /> within the groundwater basin,such as the presence <br /> of arsenic in the Semitropic groundwater bank, <br /> im.act costs but are not likel to affect reliabili . <br /> ' In pursuing new water supply options,Zone?'will <br /> Planned ?v . <br /> ' mitigate legal,environmental,water quality,and <br /> climatic risks to the extent possible;the specific <br /> Supplies =7,---, 1 factors affecting the reliability of the future <br /> •• su.dies are unknown at the time. <br /> Pleasanton's groundwater pumping quota was - <br /> Pleasanton determined based on the sustainability of the Main <br /> Groundwater Basin;therefore,its reliability is not expected to be <br /> si: ificantl affected the factors listed here. <br /> 'Potential limitations on the supply arising from the factors listed in the table have not been quantified. <br /> 5.6 WATER SHORTAGE CONTINGENCY PLANNING <br /> The City of Pleasanton developed its first Water Shortage Ordinance in 1991.In.May of 2009, Pleasanton <br /> City Council approved the Tri-Valley Water Retailers Water Shortage Contingency Plan(Water Shortage <br /> Contingency Plan),which is a cooperative plan adopted together with the Retailers).The Water Shortage <br /> Contingency Plan acts as the standing plan, defining stages and levels of water rationing, along with <br /> expected water conservation measures under each stage. Areas not covered under this plan,namely water <br /> use prohibitions,are governed under the original Water Shortage Ordinance. Pleasanton's Water Shortage <br /> Contingency Plan and Ordinance go into effect upon resolution of the legislative bodies of the public <br /> members of the Retailers group,or direction from City Council,the Director of Emergency Services(City <br /> Manager),or the Director of Operations Services. <br /> Recommendation for Plan activation may stem from the following three situations: <br /> • A request from Zone 7 to the Retailers to reduce consumption, most likely including a specific <br /> reduction goal. <br /> a As a result of the collective consideration of the Retailer staff that would also include a <br /> recommended reduction goal. <br /> • A decision by one or more Retailers,which may or may not include a reduction goal. <br /> A copy of the 1991 Water Shortage Ordinance, followed by the Tri-Valley Retailers Water Shortage <br /> Contingency Plan can be found in Appendix G. <br /> 5.6.1 Stages of Action <br /> The Water Shortage Contingency Plan uses a staged scheme to plan for water shortages of increasing <br /> severity. Table 5-5 summarizes the four stages of reduction in water use, and the definition of <br /> implementation of each stage is discussed below. Stage 4 would be declared in the event a water use <br /> reduction of up to 50 percent were required. <br /> City of Pleasanton <br /> C 5-8 June 2011 <br /> 2010 Urban Water Management Plan <br />