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project can meet water needs during a drought. There has been some concern about injection of contaminated water from the Lawrence Livermore Lab. He said the Lab does a number of tests to ensure the water coming out of the Lab meets all drinking standards. He mentioned that some level of chemicals is actually good for the body. He said the major problem in this Valley is the buildup of salt. Ms. Ayala asked if the City of Livermore's approval of the process was conservative. Mr. Stein said very conservative. - Mayor Tarver asked if questions could be held until the presenters were finished. Dale Myers, General Manager for Zone 7, said the objectives of Zone 7 is to ensure public safety in the water supply, the preservation of the groundwater basin and the enhancements of regional water resources. Another objective is to mediate between competing and compatible uses of the groundwater basin recognizing that it is a community wide resource and that everyone has some rights. Zone 7 has an obligation to protect those rights. The Zone 7 Board has reviewed public safety, monitoring systems and procedures, concurrent and long term water quality testing, indemnification by project agencies, plant operational shake down periods, development and implementation of alternative uses for water, regional participation of public and private agencies and the maximization of economic and water resource benefits. He listed other issues Zone 7 has been discussing related directly to the RO concepts. He mentioned there is a Board meeting on September 15. He believed it possible to have these projects in the Valley to enhance the water resources and still maintain public safety. Dr. James Crook, National Research Council, said a report was prepared by a committee commissioned by the National Research Council which took approximately two years. He said the committee evaluated the health aspects of using indirect potable reuse. He said the general conclusion is that while there are uncertainties with potential health risks of drinking reclaimed water the planned indirect potable reuse of reclaimed water is a viable option under certain conditions. The recommendations are to have a high degree of treatment for indirect potable use, to have an environmental buffer, and to investigate a new system for toxicological testing. Cliff Bowen, District Engineer, Department of Health Services, listed the criteria used for recycled water and the methods of control. The degree of treaUnent will depend on the physical soil and groundwater factors. He believed the treatment would control the organics to below detectable concentrations. He indicated by slides the four different categories the water goes through for disinfection. He said the DSRSD Clean Water Revival project meets section 13.540 of the California Water Code as outlined in the engineering report, meets current regulations and provides a source of water that has an equivalent or less risk to public health than existing sources. Pleasanton City Council 4 09/08/98 Minutes