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<br />exceeded by accumulated runoff, sediment, manure, or process-generated <br />wastewater, the retention structure shall be dewatered to a level that restores <br />the full runoff storage capacity and the dewatering process shall be completed <br />within a 15-day period. If the irrigation system is not capable of dewatering the <br />retention structures as required herein, sufficient additional storage capacity <br />shall be provided in lieu of dewatering capabilities upon written approval of the <br />director, and under such terms and conditions as the director may specify, <br /> <br />(b) Evaporation systems shall be designed to withstand a 10-year period of <br />maximum recorded rainfall, as determined by a water budget analysis process <br />which includes manure and process wastewater loading during that period and <br />provides sufficient freeboard to retain all rainfall and rainfall runoff from the <br />applicable design storm event without overflow. <br /> <br />81.4 GROUND WATER PROTECTION REQUIREMENTS - CONCENTRATED ANIMAL <br />FEEDING OPERATIONS <br /> <br />(A) Manure and Process Wastewater Retention Structures <br /> <br />Except as provided in subsection 81.4(8) and (C), below, all process Wastewater retention <br />structures shall be constructed of compacted or in-situ earthen materials or other very low <br />permeability materials, and shall be maintained, so as not to exceed a seepage rate of <br />1/32"/day (1 X 10" em/sec.). The operator shall have available suitable evidence that a <br />completed lining meeting the requirements of this subsection 81.4(A) was constructed. <br /> <br />(1) Compacted or in-situ earthen materials shall consist of suitable soils which meet the <br />seepage rate of this section and shall have a minimum compacted thickness of 12"; <br /> <br />(2) Very low permeability materials include flexible membrane linings, asphalt sealed <br />fabric liners, and bentonite sealants. Installation of very low permeability materials <br />shall be in accordance with the manufacturer's installation specifications; <br /> <br />(3) Altemative methods of lining, other than those described in subsections (1) and (2) <br />above, require prior written approval of the Director. <br /> <br />(8) Retention structures which collect storm water runoff from open animal feeding operations <br />and no other waters except, if any, water which has not come into contact with manure or <br />process wastewater, such as boiler cooling water or flow-through 'livestock drinking water, <br />shall be constructed of a material and maintained so as not to exceed a seepage rate of <br />1/4" per day (1 X 10.5 em/see,): provided that the retention structure is dewatered so that <br />the full runoff storage capacity is restored within 15 days of the storm event, consistent <br />with the provisions of Section 81.5. <br /> <br />(C) Earthen retention structures in existence as of August 30, 1992, shall be exempt from the <br />requirement to have available suitable evidence that a completed lining meeting the <br />requirements of subsection 81.4(A) has been constructed. Whenever the Director makes <br />a determination that seepage of nutrients or other pollutant~ from manure or process <br /> <br />8 <br />