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File May 15, 1981 Page three Mosouito Control Impoundments Four separate cells will be crossed. One is more distinct than the other three in that it has not been subjected to "dewatering" by mosquito control as requested by the property owner. This cell apparently receives some runoff from the adjacent subdivision and has a relief culvert at the southeast corner to the Main Canal. This area is distinct because a viable black mangrove/sea oxeye community exists. The remaining impoundment cells are in an adverse condition due to mosquito control techniques both impounding and the requests of property owners to stop flooding the land, discharge of fill and no efforts to restore tidal conditions within the wetland. This condition was worsened as a result of recent severe cold winters. The result of these factors are a dry wetland, significant number of dead mangrove (however, several are sending out new shoots), and the invasion of undersirable vegetation (Melaleuca sp. and peppertree). The invasion of these plants have occurred near fill sites. to The proposed road will cross wetlands that have been impo mosquito control and large sections that are filled wetla (including back dikes). The impacts to these areas will by fill removal and, therefore, recreating the tidal wet the restoration of tidal action to the impounded sites. E. d for Discussions with other regulatory agencies have broughNPWv� additional ways to minimize the impact. These include: use ofan adjustable wier instead of a flap gate, and 2) tval of the section of back dike between Vossinbury Creek and Barber Avenue. Both of these would better restore lost wetlands. If a flap gated culvert must be used then the flap gate must'be installed on the upstream end of the culvert. The flap gate on the downstream end serves only to drain the impoundment and not to restore tidal action. The additional dike removal will also provide additional sources of fill for road construction. SEP 14 1981 45 47 PAGE 464