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Dermis Gambs, representing Zone 7 Water Agency, indicated recharge activities will resume on September 13, but that has to be balanced with Sycamore Park issues in Livermore. There are no easy solutions. Zone 7 lost some of its capacity in the South Bay Aqueduct, although the capacity is to be enlarged over the next few years. He said Zone 7 was unable to use water from Lake Del Valle and the Hansens stopped discharging from their quarry. He said Zone 7 is committed to continuing to work on solutions and is developing a Streams Master Plan. He had not heard of the mosquito problem, but would investigate the situation. Ms. McKeehan indicated City staff had been working on arroyo issues all summer long. It would have added water to this portion of the arroyo if it were possible. She said staff had been trying to work on short-term solutions with the Hansens, but that did not work out for this summer, however their assistance could help in the future. The letter from Mr. Rusmeisel was being sent to Zone 7 for its information. The Mosquito Abatement District has been spraying and caused a small problem in another part of the arroyo where the City was adding water. All these agencies will work together to find a long term solution. Scott Baker indicated staff made a connection to the well near Alisal School and discharged water into the arroyo at the Main Street bridge. Later, 1,100 fi. of pipe was connected to Well 8 at the Operations Service Center on Busch Road and water is being put into the arroyo farther upstream. However, everything from that point upstream is not receiving additional water. He reiterated the efforts being made to find long term solutions. He said staff has worked with Mosquito Abatement District and residents with problems. Ms. McKeehan indicated staffhad hoped there was a solution from the Hansens. They were willing to work on this, however a lot of water has been pumped out of their quarry into Shadow Cliffs. Shadow Cliffs cannot release water without causing problems for its operation. There was also consideration of using a little pond near Shadow Cliffs, but that would not work for a number of reasons. Moving the pump at the Hansens' quarry would cost hundreds of thousands of dollars and there was no guarantee that would even work. At the same time, it would have been necessary to get a new NPDES permit because the kind of water from the quarry is not the same quality as being pumped into the arroyo from the City wells. Staff doesn't want to risk killing fish and wildlife by having silt in the water from the quarry. Staff is still working on solutions. Ms. Ayala asked for explanation of the increase in mosquitoes. Mr. Baker said moving water cleanses the arroyo. When the water stops flowing it allows larvae to develop and the fish which normally eat them die off. Then there is larger mosquito population than normal. He spoke to representatives of the Mosquito Abatement District and felt this was not an area of concern in the past. He felt they would spray in this area. Pleasanton City Council 8 08/20/02 Minutes