7807 fac but specifically excluding use of temporary

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emergency measures identified in the operation plan for the phosphogypsum stack system pursuant to subsection 62-672.780(7), F.A.C., but specifically excluding use of temporary measures identified in Rule 62-672.870, F.A.C. (23) Filter – A zone of material sufficiently more pervious than the dam or foundation so that free water will drain through the filter, but at the same time sufficiently fine grained to prevent piping of the fill material. (24) Freeboard – The height of the lowest point on the dam or dike crest, excluding the emergency spillway, above the highest adjacent liquid surface within the impoundment. (25) Gypsum dike – The outermost dike constructed within the perimeter formed by a starter dike for the purpose of raising a phosphogypsum stack and impounding phosphogypsum and/or process water. This term specifically excludes any dike inboard of a rim ditch, any partitions separating stack compartments, or any temporary windrows placed on the gypsum dike. (26) Inside (upstream) slope – The face of the dam or dike which will be in contact with the impounded liquids. (27) Log – A written record maintained by the owner of an earthen dam or a phosphogypsum stack system that contains a schedule of inspections of system components, the findings of such inspections, and any remedial measures taken in response to such findings. (28) Maximum Design Level – the maximum process water elevation when the water level is at the operating design freeboard for an impoundment as determined using generally accepted good engineering practices, or the minimum freeboard allowed by paragraph 62-672.600(1)(c), F.A.C., for perimeter earthen dikes. For the purposes of this chapter, generally accepted good engineering practices for determining the permitted operating design freeboard includes, at a minimum, evaluation of wind surge, wave height, and wave run-up analyses, erosion protection measures, and protection of dike integrity and inner rim-ditch geometry. (29) Maximum Potential Storage – the maximum amount of rainfall that can be contained within a phosphogypsum stack system, including AHPs and the top areas of phosphogypsum stacks, and temporary use of design freeboards in accordance with the provisions of subsection 62-672.870(1), F.A.C.
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(30) New perimeter earthen dike – A perimeter earthen dike which is the subject of a complete application for a department permit to construct or laterally expand a phosphogypsum stack system submitted to the department after June 28, 1999. (31) Non-clay phosphate mining impoundments – Above-grade, non-clay phosphate mining/reclamation berms and impoundments such as: (a) Units under reclamation receiving hydraulic fill; (b) UInits constructed for impounding stormwater runoff; (c) Structures located in mine cuts that could impound water above grade, and where a failure of such structure could result in a release of waters to waters of the state; and, (d) Perimeter ditch and berm systems that impound water above grade.
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  • Spring '13
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  • Dam, New Perimeter Earthen Dikes

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