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maximum infiltration of stormwater runoff from each drainage area for the design storm. Each percolation or retention area shall include positive drainage facilities which provide for drainage to public outfalls or a lake, or water course, to handle the runoff from storms of longer duration and severity. Except in those development projects where temporary ponding is allowable pursuant to Section 7 (A) (13) each percolation or retention area shall include positive drainage facilities which provide for drainage to public outfalls or a lake, or water course, to handle the runoff from storms of longer duration and severity. The area surrounding these retention or detention basins is recommended to be used as public or private open space and shall be grassed. (c) The Soil Survey of Indian River County, Florida, published by the U.S. Department of Agriculture, as made available, shall be the document to determine soil classification in this ordinance. (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 bitumi- nous coated steel pipe arch. PVC pipe shall be acceptable only for installations in a privately maintained system and only if of appropriate 0411 tX ¢X4¢00 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. Con- crete for reinforced 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 ter- minating 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 specif- ically designed with high percolation rates (such as east of