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with the Hansens, it needs to include Zone 7. He cautioned that when large quantities of water are discharged from the quarry, it leaves the valley. Only when small amounts are discharged, does it percolate into the groundwater basin. Ms. Ayala expressed her concern about the number of Zone 7 wells in Pleasanton. Mr. Cummings indicated there is a well master plan and an environmental impact report is being prepared. He estimated six to ten more wells would be drilled. The additional wells would only be called upon during a drought period. Ms. Ayala believed these wells were the reason for recharging the groundwater basin. Mr. Cummings said the recharge comes from the streams and the quarries. In the future the chain of lakes will provide additional storage for recharging more water. Ms. Ayala asked if there were any future problems for water supply for the valley. Mr. Cummings said there is a sustainable supply to get through dry years up to 2013. They do not have supplies for agricultural demands in the future. Mayor Pico asked how the Berrenda Mesa decision impacted the valley? He wondered if Zone 7 could draw on that supply. Mr. Cummings believed Mayor Pico was referring to the storage area, but the problem is the conveyance that brings water into this valley, the South Bay Aqueduct. That is the problem during the peak summer months. There is more than enough capacity during low times of year. Mayor Pico asked what we would have done if Hansen continued to quarry and discharge water into del Valley. Would the City have to significantly cut down on usage? Why curtail water to the arroyo if there are other options? He asked if Zone 7 is willing to pay for or share in the cost of pumping water by the Hansens for some kind of short term solution to keep the arroyo alive? Mr. Cummings said he could not answer that, but would take that before the Zone 7 Board. Zone 7 staff has been working with City staff to identify all the options available. Mayor Pico also felt conservation efforts should be considered and perhaps enough water could be saved to allow continued flow in the creek. Ms. Dennis felt that because the regulatory agencies tend to be slow to move, perhaps Zone 7 and the City could share the cost of retaining a biologist to determine how much water is necessary to sustain the arroyo. There may be less flow in summer than we have seen, but she felt the suddenness of the reduction of water was the problem. If there is a long term sustainable plan for a Iow flow summer and we have to pump water into the arroyo, how much do we need and for how long? Pleasanton City Council Special Meeting Minutes 15 07/09/02