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Exhibit "D" <br />IR Impoundment #18 Management Plan <br />May 1992 <br />while providing for fish, wildlife enhancement and the improvement of impoundment <br />water quality. The exception to this schedule is the southeast cell which, as <br />mentioned, will remain open to the lagoon as long as mosquito conditions permit. <br />III. TECHNICAL CONSIDERATIONS. <br />A. HYDROLOGICAL AND TOPOGRAPHICAL CONSIDERATIONS. <br />1. LOCATION. Impoundment #18 is located in the southern, mainland <br />portion of Indian River County directly to the west of the Vista Royale <br />development (Figure 1). The south relief canal is 0.6 mi. north of the <br />impoundment's northern edge. The relief canal is the nearest major <br />source of freshwater. The impoundment extends down almost to Oslo <br />Road (Florida Medical Entomology Laboratory road) which is approx. 2 <br />miles north of the Indian River/St. Lucie Co. line. <br />2. SIZE. The Rey/Kain impoundment inventory lists Impoundment 7#1 at <br />133 acres. The maximum width of the impoundment is approx. 2000 ft. <br />with a perimeter linear dike length of approx. 3.0 miles. <br />3. TOPOGRAPHY. Marsh elevations determined in March -May 1992 <br />show a highly variable marsh topography (see Figure 6). The marsh <br />contour ranges from deep interior ponds to many hillocks supporting red <br />and white mangroves. Marsh elevations along the western <br />impoundment quadrats dictate the need for a flooding elevation of <br />approx. 1.8 ft. NGVD. <br />4. DEKE CONFIGURATION. The dike, which skirts the entire <br />impoundment perimeter is intact and varies- in elevation from <br />approximately 25-3.5 ft NGVD but with several low spots. There are <br />also numerous interior dikes dividing the impoundment into 7 <br />recognizable cells. All the interior dues are breached allowing water to <br />flow throughout the impoundment. Therefore water pumped into it at <br />the pump station (NW corner) makes its way throughout the <br />'impoundment. There is also a Freshwater Pond (13 acres) which is <br />adjacent to but not connected to the impoundment (Figure 2). We <br />assume a freshwater well feeds this as it remains constantly flooded <br />with nearly fresh water. <br />2 <br />