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105 i. This item was moved to Item 5, MEETING OPEN TO THE PUBLIC. j. This item was continued to the March 17, 1992 City Council meeting. The TOll call vote was as follows: AYES: Councilmembers Butler, Mohr, Scribner, Tarver and Mayor Mercer NOES: None ABSENT: None ABSTAIN: None ~EETING OPEN TO THE PUBLIC Sandy Figuers, Chairman of the Board of the Alameda County Eater District, Zone 7, explained the water supply for this coming year and the water plan into the next century. Currently, Zone 7 has gained three to four thousand acre feet of run-off into Lake De1 Valle and morerun-off is expected. Zone 7 anticipates getting 30% of requested water supplies. It will be requesting a voluntary 10% reduction in water use. He pointed out there is no new water in the ground water basin, although the basin is recharged. The basin holds 240,000 acre feet of water of which approximately 120,000 is usable. Zone 7 could pump 18-20,000 acre feet of water per year out of it at maximum pumping capacity. Mr. Figures stated that Zone 7 currently supplies water to approximately 50,000 dwelling units (133,000 persons). The current water system infrastructure will supply approximately 70,000 dwelling units. If the approved dwelling units (5,500) and the proposed dwellingunits (15,000) were built, he expected the demand of water would exceed the supply in 10-12 years. The technical problems are knowing how big to expand the current system and what area to supply. If Zone 7 must purchase water from the state, the cost of water to the local residents would increase. The second source of water would be reverse osmosis. (He brought a sample of the water from a reverse osmosis process). He anticipated Zone 7 could generate between 20-25,000 acre feet of water by using this process. Zone 7 is almost at the maximum capacity of its ability to store and treat the water. If it purchases new water supplies or uses reverse osmosis, a new storage area (a dam, a treatment plant twice the size of the existing one, pipeline, etc.) would be needed. Zone 7 anticipates the cost for these infrastructure changes to be between 200 and '400 million dollars, not including finance charges, or operating costs. Capital costs could be funded out of water connection fees. The fees would have to be raised within the next two to three years to generate monies to build a dam. It takes 10-15 years of building s/s/e2 3