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Exhibit "D" <br />L INTRODUCTION. <br />This plan, which proposes improved management of Indian River (IR) Impoundment <br />#18 (South Vista Royale), is in response to objectives as defined by the Subcommittee <br />on Managed Marshes' (SOW for improving management of IR lagoon <br />impoundments whenever possible. This impoundment, which has recently become <br />public domain through purchase by Indian River County and the St. Johns River Water <br />Management District, currently is not connected to the M. This proposed Rotational <br />Impoundment Management (RIM) plan has been developed through an Indian River <br />Mosquito Control District (IRMCD) contract with the Office of Entomology & Pest <br />Control, Fla. Dept. of Agriculture and Consumer Services who are administering <br />SWM/St- Johns River Water Management District funds. This beneficial arrangement <br />will allow quick implementation of the plan. The format for this management plan <br />follows SOMM guidelines adDpted in October 1989. <br />IL MANAGEMENT PLAN OBJECTIVES. <br />Since currently there are no culverts in Impoundment #18, the impoundment -lagoon <br />connection being proposed will establish optimal culvert connection between the <br />impoundment and IRI. and Frovide for improved pumping capabilities through the <br />installation of a permanent e�lecttic pump. Also, because of the existing system of <br />interior (breached) dikes, a. RIM management variation is possible and will be <br />attempted here., IRMCD wi1_'i reconnect the southeast impoundment cell (=approx. 40 <br />acres) to the lagoon with two (2) 30 in. diameter culverts then leave this cell interridal <br />year-round It will become pwt of the summer flooding schedule only if, or when, the <br />mosquito production becomes problematic there. <br />The culvert opening and closing schedule proposed here for the remainder of the <br />impoundment is consistent w-ith other RIM plans for this portion of the IRL. Culvert <br />closing will be in the late Wring/early summer depending on rainfall patterns. The <br />impoundment will be flooderd to a maximum of 1.8 ft. NGVD, a minimal flooding <br />level necessary to cover mucz of the marsh surface. Culverts will be opened in the <br />Lim summer/early fall when rising lagoon levels historically allow lagoonal water to <br />flood the high marshes. This typical RIM plan will allow for IRMCD to continue <br />(and improve) source reduction mosquito control benefits within this impoundment <br />1 <br />