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the changes in its size with time, and to project the <br />future. utility of the lens. This report contains a <br />quantitative appraisal of the Florida aquifer produc- <br />ing zones and should serve as an aid to water re- <br />source planners in determining management strategies <br />to enhance the utility and duration of this water <br />supply. <br />Staff recommends that the features of the Sebastian Freshwater <br />Lens, as identified by Dr. Toth, be given serious consideration <br />by the Board of County Commissioners when determining ground <br />water management strategies associated with land development <br />activities in the North County. <br />Dr. Toth made a slide presentation. He informed the Board <br />that the "Sebastian Lens" is the only area in southeast Brevard <br />County and Indian River County where the aquifer contains potable <br />water. It is a finite reservoir of fresh water which was <br />entrapped in the rocks during the last glacial advance; it is <br />continually shrinking due to ground water withdrawal, and the <br />water that is being removed is being replaced with much higher <br />chloride content. The lens itself receives no recharge. The <br />study area covers from Floridana Beach south to Wabasso Beach and <br />extends approximately two miles west of the Indian River <br />shoreline. Dr. Toth noted that in this area the lens consists of <br />two zones; the upper zone is penetrated by wells from 300-500' in <br />depth and consists of three lobes. The southern lobe penetrates <br />part of Indian River County and stretches from Mathers Cove in <br />Brevard County to News Cut in Indian River County, which <br />locations are shown in the following sketch. <br />51 <br />BOOK 1'}?Ut <br />