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425-2 r. Waste storage ponds should not be placed in floodways. Ponds located on the flood fringe must meet the requirements of Wisconsin Administrative Code NR116 and be protected from inundation by a 100-year regional flood. A freeboard of 3 feet above the 10U year frequency flood shall be provided. Vertical separation distances to bedrock and/or •round water. All ponds have floors or bottom elevations located above either bedrock or thehiihestll ground water elevation in accordance with table 1. 9 t Distances to wells or reservoirs. = Criteria for location of storage ponds as related to wells are contained in table 1. - - - Criteria for reception pits, hoppers, and transfer pipes are contained i interim standard for Waste Transfer (358). in the 'Solids se aration. To minimize frequency of solids removal from waste storage •ponds, po uted runoff shall be directed settling low gradient channels, or `settling basins to remove readily settleable solids. Settling facilities shall have adequate capacity to store settled solids for a reasonable period, based on climate, equipment, and method of disposal or storage. If animal manure� bedding,. or manure containing a high content of fibrous material is to be flushed, , a - storage pond, a solids separator should be provided for removing this materi facilitate pumping and irrigation. al to Sealing waste storage. ponds. Waste storage ponds should have bottoms and sea e w enever so] s containing less than 50% fines (amount passing the No.d200 sieve) are present within 3 feet of the floor or bottom of the pond. Waste `, storage ponds located in soil materials with 40 to 50 percent fines (amount passing the No. 200 sieve) do not require sealing if at least 15 percent of the soils material is small than .002 mm and the soil has a plastic index P�I') of o 7 or more. Alternatives for sealing are contained in table 2. Waterst other similar sealants are required for construction joints in concretewhenr liquid-tight floors and/or walls are required. Whenever waste storage ponds have linings using materials other than conc rete anti -scour devices or pads will be installed to prevent erosion of the ma- • terials. Normally these will consist of concrete pads or a floor which extend a minimum distance outward and up the side slopes 10 feet from each point where - the agitator pump is operated. Flexible membranes will be protected on side - -slopes with concrete or similar material if equipment such as pumps will be allowed on the side slope. Consideration will be given to having more than location for agitation. Gate openings, posts, or other methods will be used one locate the proper point where pumping and agitation equipment may be used, to o Design Criteria Soil and foundation. Soil profiles obtained by borings or backhoe test pits shall be made to an eleva- tion at least 3 feet below the constructed bottom of the pond or to bedrock. Ponds located within 250 feet of a well must be investigated to a depth of 5 feet or more (unless bedrock is encountered) below the anticipated bottom elevation. The elevation of water tables and the date of investigation will be noted. USDA-SCS-Wisconsin Section IV Technical Guide • 10/83