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Exhibit "D" <br />IR Impoundment #18 Management Plan May 1992 <br />b. IR IMPOUNDMENTS #20 (VISTA GARDENS) & 421 <br />(SCHLMS). These two impoundments totalling 122 acres are <br />just to the notch of IR Impoundment #19 thus within approx. <br />0.75 miles from South Vista Royale. These impoundments are <br />interconnected with a culvert therefore both are flooded from <br />one pump station. They have no connection to the IR lagoon. <br />C. IR D4POUNDME14T #17 (LOWENSTETN). This 65 acre <br />impoundment, abuts Oslo Rd. to the south, is breached and <br />frequently is a producer of salt -marsh mosquitoes (Ae. <br />taeniorhvnchus or Ae. sollicitans) thus typically in the summer <br />requiring at least several aerial applications of Altosand <br />(--methoprene). <br />11. OWNERSHIP. Impoundment #18 (and adjacent upland parcels) were <br />z recently purchased by a joint venture between Indian River County and <br />the St. Johns River Water Management District Indian River County is <br />currently developing a management plan for the entire area purchased <br />which also includes adjacent uplands. This management pian is <br />intended to serve as a part of that larger plan scheduled to be completed <br />in the fall of 1992. <br />B. BIOLOGICAL SECTION. <br />1. AERIAL PHOTOGRAPHS. Figure 9 is a replication of a 1943 aerial <br />photo. Please note the extent of parallel ditching conducted prior to <br />1943. The vegetation appears to be largely low-Iying plants (probably <br />Batis maritima and Salicornia vireinica with mangroves lining deeper <br />water. It is unknown the reason for the square area near the middle of <br />the impoundment. It is possible that it was an early farming attempt of <br />some sort. Figure 10 is a 1992 aerial As is the case with many other <br />impoundments throughout the county, please note the extent of dead <br />vegetation primarily caused by the Dec. 1989 freeze. <br />2. VEGETATION. <br />a. PUMP CELL. Mostly dead plants with some new red <br />mangroves (Rhizoohora mangle) dominate this cell_ Dense <br />patches of widgeongrass (Rumia maritima) are present. <br />5 <br />