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a Exhibit "D" IR Impoundment #18 Management Plan May 1992 Because our proposed management plan will establish seasonal laeoon- marsh connection and allow for more precise water level controls, we expect the plan to cause no further harm to these animals as compared to management conducted here since 1958. Based on the study of RIM effects in IRC impoundments, we expect the habitat improvement brought about by RIM to generally benefit wading birds. The seasonal drying allowed by RIM should further improve bird feeding potential by concentrating fish in ponds and the perimeter ditch. Research has demonstrated that RIM is basically compatible with the life cycle of several commericaliy and recreationally important fish, thus snook should benefit (O'Bryan et al). It is unclear what effect RL M - management has on Rivulus. Current theory holds that a RIM managed impoundment is preferable to a closed impoundment (Scott Taylor, pers. com.) but there is a lack of documentation of what real effects RIM may have. It is anticipated that there will be no further deleterious effects by increasing the number of culverts. Although impounding is believed to be harmful to the atlantic salt marsh snake by reducing their normal habitat during the summer, RLM implementation should not further harm this animal. Habitat should not deteriorate for the eastern indigo snake and the gopher tortoise. Of all the animals listed, the potential adverse effects for the alligator are greatest. It is expected that making Impoundment #18 seasonally intertidal will increase salinities when tidal water is allowed to penetrate the marsh (rye., fall/winter & Wig). However, given that the Freshwater Prand should not be influenced by culverting and that - sahnrties in Impoundment #19 (adjacent to the north) are virtually fresh, a large amount ,of freshwater habitat will remain in this immediate area for the alligators use. C. MOSQUITO POPULATION CONTROL SECTION 1• GENERAL. 11RMCD controls saltmarsh mosquitoes by Integrated Pest Management .(IPW methods. This variety of methods include the seasonal flooc$ng of impoundments, brvidding, and ground ULV (ultra low volume) adulticiding 'le different elements of this IPM program are implernentred on'a need basis. Need is determiried by incorporating reports from iIRMCD entomologists, biologists and field personnel on the presence. cof larval or adult mosquitoes. Also, reports and service requests from local residents are taken into consideration. Currently, 9