62-672.doc - CHAPTER 62-672 MINIMUM REQUIREMENTS FOR...

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CHAPTER 62-672 MINIMUM REQUIREMENTS FOR EARTHEN DAMS USED IN PHOSPHATE MINING AND BENEFICIATION OPERATIONS AND FOR DIKES USED IN PHOSPHOGYPSUM STACK SYSTEM IMPOUNDMENTS 62-672.100 General (Repealed) 62-672.200 Definitions 62-672.300 Construction of New Dams 62-672.400 Operational Requirements 62-672.500 Inspections 62-672.550 Contingency Plans 62-672.570 Non-Clay Phosphate Mining Impoundments 62-672.600 Construction of New Perimeter Earthen Dikes 62-672.620 Assessment of Existing Perimeter Earthen Dikes (Repealed) 62-672.650 Operational Requirements for Perimeter Earthen Dikes 62-672.670 Inspection and Maintenance Requirements for Perimeter Earthen Dikes 62-672.700 Construction of New Phosphogypsum Stacks 62-672.720 Assessment of Existing Phosphogypsum Stacks (Repealed) 62-672.750 Procedures for Raising Phosphogypsum Stacks 62-672.760 Procedures for Decanting Process Water from Top of Phosphogypsum Stack 62-672.770 Phosphogypsum Stack Inspection and Maintenance 62-672.780 Phosphogypsum Stack System, Operation Plans 62-672.800 Training 62-672.850 Contingency Plans 62-672.870 Emergency Measures 62-672.100 General. Rulemaking Authority 403.061(22), 403.4155 FS. Law Implemented 403.061(22), 403.4155 FS. History–Revised 12-8-72, Formerly 17-9.01, 17- 9.001, 17-672.100, Amended 6-28-99, Repealed 2-16-12. 62-672.200 Definitions. (1) 100-Year Rainfall Event – A rainfall event which is characterized by a mean return period of one hundred years, i.e., a rainfall event which has a 99% probability for not being exceeded during any given year. (2) 100-Year Annual Rainfall – The 100-Year rainfall event representing total annual rainfall of 76 inches. (3) Abandoned dam – An abandoned dam is one associated with a settling area from which sufficient water has been removed to make the residue no longer a pollutional threat to surface waters or a hazard of any type to land areas. (4) Above-Grade Perimeter Earthen Dike – A perimeter earthen dike that has its design freeboard above the adjacent ground surface. (5) Active dam – An active dam is one associated with a settling area into which wastewater is being introduced for purposes of clarification or in which free water remains in contact with the dam. (6) Auxiliary holding pond (AHP) – a lined storage pond, designated by the operator and approved by the department in accordance with Rule 62-673.320, F.A.C., typically used to hold untreated process water. AHPs are intended to increase system storage above that otherwise provided by cooling/surge ponds and are typically located within the footprint of a phosphogypsum stack system. An existing AHP may be unlined where it was authorized by a permit issued in accordance with Rule 62-673.320, F.A.C., to be in use as of July 19, 2006, or was otherwise subject to a demonstration provided in accordance with subsection 62- 673.650(2), F.A.C. (7) Backup power – A secondary source of power not likely to fail simultaneously with the primary source. (8) Beach or Delta – A gently sloping area of gypsum deposited within the settling compartment, above the process water level.
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  • Spring '13
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  • Dam, New Perimeter Earthen Dikes

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