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(9) Material Specifications for Culverts and Storm Sewers. The following pipe materials are acceptable: (a) Reinforced concrete pipe, bituminous coated corrugated steel pipe, aluminum pipe, aluminum pipe arch; bituminous coated structural plate steel pipe, and bituminous coated steel pipe arch. PVC pipe shall be acceptable only for installations in a privately maintained system and only if of appropriate loading criteria for the intended use. (b) Workmanship and pipe materials shall conform to DOT Standard Specifications, latest edition. (c) Concrete pipe shall be used under County right- of-way pavement and into salt water outfalls, however, aluminum pipe may be approved if appropriate soil conditions exist and proper installation procedures are insured. Concrete for rein- forced concrete box culverts shall conform to DOT's Standard Specifications, latest edition. (10) Inlets - Design and spacing of inlets shall be in accordance with Florida DOT's Standard Specifications or Indian River County Specifications. (11) Drainage Structures - All cross drains and storm sewers shall have headwalls, flared -end sections, or terminating structures in accordance with County Standard Specifications or Florida DOT's Specifications. Endwalls, inlets, or other appropriate terminating and intermediate structures, and backflow devices may be required where necessary. Exfiltration systems shall be equipped with clean outs at all terminating points. (12) Temporary ponding is allowable in areas specifically designed with high percolation rates (such as east of SR A -1-A on the Barrier Island) so that ponding does not last more than eight (8) hours. (13) Materials used in drainage facilities which cross, traverse, or encroach major roads as depicted on the Indian River County Thoroughfare Plan shall be concrete designed for a fifty (50) year life. (14) All stormwater facilities shall be established in dedicated water management tracts, easements or specified common areas. Condominium documents, deed restrictions, or other legally binding instruments shall describe the location of such areas, specifically define the the mechanism for preservation of and maintenance of any private drainage systems, and shall appoint an entity responsible for maintenance and preservation. All water management tracts shall include a maintenance berm, with a slope not steeper than 8 foot horizontal to 1 foot vertical. In addition such facilities, as well as open channels and ponds, shall have an easement for access to and around the perimeter for maintenance. Retention or detention facilities above and below the designed high water elevation shall be graded to slopes not steeper than 4 foot horizontal to 1 foot vertical.