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Exhibit' D" Cultural Resources A 1992 county -wide archaeological survey funded by Indian River County and the State Division of Historical Resources, conducted by The Archaeological and Historical Conservancy, Inc., identifies three intact archaeological sites on the property and the adjacent IFAS Florida Medical Entomology Laboratory property. The three sites located on or adjacent to the original ORCA property are on the Florida Master Site File for archaeological resources. The sites have been named the Bidlingmayer Site (#8 -IR -836), located on County -owned property south of Oslo Road, the IFAS (Institute of Food and Agricultural Sciences) Site (#8 -IR -837), located on FMEL property, and the Crawford Site (#8 -IR -838), located on the original ORCA property. Together, the sites are part of a large ceramic and oyster shell midden complex, including animal (e.g., bird, fish, and turtle bone) remnants. The sites are suspected to be indicative of an Ais Indian summer village site, opposite an Ais winter village site on the barrier island. The Archaeological and Historical Conservancy, Inc. concludes that the sites are significant, describing the IFAS Site as "extremely important: not only does it contain information about [Ais] resource exploitation of the estuary back lands, but also enough non -faunal material to provide information about intra -regional trade and cultural influences". No known archaeological sites are located on the Flinn Tract. A lithic scatter site is listed just offshore from the FIND property, to the northeast of the ORCA boundary. PAST MANAGEMENT PRACTICES Mosquito Impoundment Management In 1994 and 1995, the Indian River Mosquito Control District implemented improvements to reconnect the South Vista Royale Impoundment to the Indian River Lagoon via the installation of nine 30" diameter culverts. The management method, known as rotational impoundment management (RIM) uses culverts equipped with flap -gates to allow for controlled seasonal flooding. Under the RIM plan, the southeast impoundment cell (+40 acres) was connected to the lagoon via two 30" culverts. As a result, the cell is now intertidal year-round. The southeast impoundment cell may be flooded in summer months, however, but only as necessary in certain years when mosquito production becomes problematic. The culvert opening and closing schedule for the remainder of the impoundment is consistent with other RIM plans for this portion of the lagoon. Culvert closing is in the late spring or early summer, depending on rainfall patterns. The impoundment is flooded to a maximum of 1.8 ft. NGVD, which is the minimal flood level necessary to cover much of the marsh surface. Culverts are opened in the late summer or early fall of each year, which is when rising lagoon levels historically flood high marshes. The restoration project has improved the wetlands and benefited the Indian River Lagoon by reintroducing important nursery and feeding grounds to lagoon marine life. The controlled seasonal flooding also reduces the need of pesticide use for mosquito control purposes. Exotic Plant Removal and Control 12