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MAR- 3 BOOK 67 ;1c 1 <br />PRESENTATION - APPRAISAL OF FLORIDAN AQUIFER AS A SOURCE OF <br />POTABLE WATER FOR NORTHERNMOST SEGMENT OF BARRIER ISLAND <br />Michael Miller, Chief of Environmental Planning, reviewed <br />the following memo and introduced Dr. David Toth: <br />TO: The Honorable Members of DATE: February 18, 1987 FELE: <br />The Board of County , <br />Commissioners <br />DIVISION HEAD CONCURENCE <br />• SUBJECT: <br />Robert M. a a ig, P <br />Planning & DevolopAdnt <br />FROM:Environmental <br />R. Miller, Chief / <br />• Environmental Planning WEERENCES: <br />PRESENTATION BY DR. DAVID <br />TOTH, HYDROLOGIST, WITH <br />ST. JOHN'S RIVER MANAGE- <br />MENT DISTRICT, CONCERNING <br />AN APPRAISAL OF THE <br />FLORIDAN AQUIFER AS A <br />SOURCE OF POTABLE WATER <br />FOR THE NORTHERNMOST SEG- <br />MENT OF THE BARRIER <br />ISLAND. <br />It is requested that the data presented herein be given formal <br />consideration by the Board of County Commissioners at their <br />regular meeting on March 3, 1987. <br />INTRODUCTION TO PRESENTATION <br />Dr. Toth recently offered to brief the Planning & Zoning <br />Commission and Board of County Commissioners on his recently <br />completed Groundwater Study, as outlined above. The presenta- <br />tion is scheduled for approximately 15 minutes and will include <br />a slide presentation. <br />The introduction to the report is a$ follows: <br />The Floridan aquifer is the primary source of water <br />supply in the east -central Florida area. South of <br />Volusia County, however the Floridan generally <br />contains water with chloride concentrations that <br />exceed 250 milligrams per liter (mg/1), the recom- <br />mended limit for public drinking water (Figure 1). <br />Therefore, throughout much of Brevard County it is <br />difficult to obtain ground water suitable for public <br />supply. The City of Cocoa obtains water from both <br />the surficial and Floridan aquifer systems in Orange <br />County. The city of Melbourne and adjacent areas of <br />South Brevard County rely on surface water from Lake <br />Washington. In Indian River County, practically all <br />of the public and domestic water supply systems tap <br />the surficial aquifer system. <br />Supplies of potable water within the Floridan aquifer <br />in southeastern Brevard and eastern Indian River <br />Counties occur only in the area bordering Sebastian <br />Inlet. Here, the Floridan aquifer contains a lens of <br />potable quality water completely surrounded by <br />non -potable quality water. This lens is referred to <br />as the Sebastian Freshwater lens. The lens supplies <br />significant quantities of water to a large number of <br />South Brevard and Indian River counties.residents. <br />The purpose of this study is to determine the aerial <br />extent of the Sebastian Freshwater lens, to document <br />50 <br />