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Item 6c Zone 7's Water Quality. Management Program, Draft Water QuaH~. Policy and Implementation Plan (SR 03:050) Steve Cusenza introduced members of Zone 7 and saying they were requesting comments from each of their four major treated water customers on the documents presented. In general, City staff agrees with the Water Quality Management Plan and the draft policies. There has been a response letter drafted that includes the City's concerns on two key areas of assumption in the implementation plan. These areas correspond with project timing and funding for the recommended water quality improvements. A presentation coveting objectives, policy background, proposed policy goals, and the implementation plan was made by the following: Ms. Angela O'Brien, WQMP Project Engineer from Zone 7; and Ms. Karen Johnson, Project Manager with Montgomery, Watson, Harza, Consultants for the WQMP. Also present from Zone 7 was Mr. Ed Cummings, Assistant General Manager with Zone 7; and Mr. Jon Marchand, Director, Zone 7 and member of the Zone's Water Quality Committee. Mayor Pico said one of the concerns is there is a greater demand being placed on the groundwater basin to supply new growth. It is his understanding that as we take more water out, we have some impact on the hydrostatic balance of the basin that is keeping the salts out at this point in time. As we increase the drafting of the groundwater basin, we tend to encourage more of the salts to intrude into the main basin. As a result we have a greater requirement for salt management program to reduce those kinds of salts. Is there any plan in any mitigates or reduces or eliminates the increased demand on the groundwater basin? Mr. Cummings said this was looked at during the EIR. The actual use of the groundwater basin is a conjunctive use; what Zone 7 draws out it replaces in equal amounts. Most of the water is sitting, ready for the dry years. To meet the reliability policy is having the water stored for these uses. The operation will be done in such a way as it does not go below historic lows. Zone 7 will be operating the basin in the same range as it has historically operated. The separate activity being done currently is the Master Plan, which will be coming out this year and will look at how the ground water is going to be operated, mitigations for long term uses, and the environmental documentation that goes along with this. This is coming in tandem with this plan. Mayor Pico asked how many wells have been put into the groundwater basin in the last five years. Mr. Cummings said Zone 7 had put in one replacement well and two new wells. Ms. Ayala asked how many would be put in the future. Pleasanton City Council 11 03/04/03 Minutes