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water in the Lower zone is higher quality and representative of <br />the original water entrapped in the lens. Most of the water is <br />being withdrawn from the upper zone, and the only significant <br />withdrawal from the lower zone was by Aquarina which in 1984 <br />withdrew 2.2 million gallons per year. Dr. Toth then cited <br />figures for the gallonage drawn from the various Lobes, stressing <br />that ground water heat pumps are the largest user of the water <br />from both lobes. Total water use amounted to 195 million gallons <br />per year in the middle and south lobes, and based on 1984 <br />figures, they estimate a minimum life of 143 years for those <br />lobes. <br />Commissioner Bowman asked if the life of the lens had been <br />estimated based on the figures for today's use, and Dr. Toth <br />stated just the 1984 figures were used; he agreed the use <br />obviously will increase so the actual life would be shorter. <br />Commissioner Bowman asked what Dr. Toth would recommend <br />about the use of the lens for heat pump purposes, and he advised <br />that Brevard County has an ordinance that says all existing heat <br />pumps must have a demand valve on them when they are not in use, <br />and if new pumps are put in, there must be a return well <br />returning the water to the aquifer of origin. This is what he <br />would recommend for Indian River County also. <br />Chairman Scurlock believed the issue is not whether the <br />resource is there, but the cost of producing potable water. He <br />believed there actually is not a lack of the resource, and the <br />whole purpose of this study would be to manage that resource to <br />reduce the cost over the longest period possible. The Chairman <br />felt most people do not realize that in Indian River County we <br />are way ahead in terms of re -use for golf courses, etc., so that <br />we don't have to use potable water for irrigation purposes, and <br />in fact, he felt we may be leading the state in that effort. <br />Discussion continued in regard to withdrawal wells on the <br />barrier island and also as to whether the lens extended down into <br />the grove area. <br />,9- <br />53r,1J S, <br />BOOK F,�.: a= <br />