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M along the river or any tributary, whichever is greater. The design of any residential development shall restrict boat access to the river consistent with federal, state and local laws and regulations providing for the protection of manatees. To further protect manatees, only non -motorized boats will be allowed in association with development on the west side of the St. Sebastian River. Because of the importance of the community ps an intact natural ._system, areas designated as- set -asides must contain ecologically adequate habitat to maintain and preserve the natural functions and character of this community. * No off-site mitigation for such area shall be permitted. The county shall encourage the conservation of this xeric scrub community by establishing density transfer and cluster development land use regulations to limit the impact of development on this property. Appropriate infrastructure such as central sewer service and surface water management systems may be required for the protection of the St. Sebastian . River ecosystem. In addition, the following criteria must be met: ° Prior to the submittal of any plan of development, the site shall be surveyed by a qualified biologist or ecologist for the presence of plant and animal species listed as endangered, threatened or as species of special concern by the U.S. Fish and Wildlife Service, Florida Game and Fresh Water Fish Commission, or the Florida Department of Agriculture. The survey methodology shall be one that is professionally accepted and applied. Among the species anticipated to be located on the site are the Florida scrub jay, gopher tortoise, gopher frog, Florida mouse and eastern Indigo. snake. ° The clustered development shall preserve 80% of the scrub habitat as part of an intact contiguous natural system and include the critical habitat needed to maintain viable populations of the listed species' on-site. To the extent environmentally and economically feasible, development sites shall be selected to avoid occupied habitat in order to minimize the need to relocate threatened and endangered species. ° Access roads shall be constructed and located to avoid impacts to wildlife. In particular, access roads shall be designed to minimize any effect they may have as barriers by employing road design standards which take into account natural features and wildlife habits . • Such design standards shall include, but are not limited to: minimum pavement width and shoulders; one-way roadways wherever possible; minimum swales; orientation to minimize use by animals as resting/sunning areas; reducing speed limits to under 30 miles per hour; and signage to remind users to be watchful of wildlife. ° The development pattern shall be designed to allow prescription burning of the preserve area; however, see below. ° A habitat management plan shall be prepared and approved for the scrub preserve prior to final development approval that a. includes a schedule for prescription burning in stages over time to ensure viable habitat remains for the listed species at all times. A prescribed or controlled burn is the preferred management method. In the event that excessive smoke would prevent a burn permit from being issued, then mechanical clearing of some vegetation prior to the prescribed burn would be the next best alternative to pursue. The last alternative is mechanical clearing and no use of fire. Any mechanical clearing of vegetation must avoid disturbing the soil to the extent that it affects the ve-establishment of the scrub habitat, and September 20, 1994 45 BOOK 93 FAGS 3 I