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05/26/2009 13:27 9518273349 DOUGLAS KUNEY PAGE 09/14 promaie dissolution of gases, minimize escape of odors, and require less land area for a given treatment volume. Lagoon shape can affect the mixing of its �ontents, Circular and square sbapea usually promotalbest mixing, but elliptical and rectangular lagoons may be used if their lwtgth to width ratio dors not exceed as1. The periphery should be uniform and free of pockets, isldnds,, and coves which contribute little additional grater v6lume to 'the lagoon, and may be a source of nuisance conditions. special cases may justify long narrow lagoons, espici.ally for flow- through units in multiple-stage systems, and where construction and de�-sludginq will be accom-Alish&d by dragline. Lagoon bottoms should be as fla as possible to promote uniform 4istri]2ution of wastes. Side slopea are primarily determined by soil type, with more stable soils adaptable to steeper slopes. Steep slopes below the waterline discourage weed growth 1 and mosquito habitat. Flatten slopes, normally 3:1, sh d be used above the maximum waterline to allow easy establisbment of ground cover and safer mowing. bake the top of ail embankments at least 8 feet oxide for equipment travel andioperation. Emban]aatent height should be increased durir1q construction by the amount noeded to enm=e that design top elevation will be achieved after settlemeatf minfwum increase should norAkUly be 5 pelt. Locate inlets near the center of the lagoo� if possible to a o:zrage solids distribution throughout tfie impoundment Multiple housing units usually permit use cif several inlets to further aid in uniform distribution. Zia of gutter cleansers or augers to move manure directlyiinto the lagoon may result in large deposits of manure at i is loading point, but it the drop point is beyond the embank int slope and' loading points are well di,stri.buted, bacteiial activity and gas bubbling will eventually distribute wanes through the lagoon. Additional lagoon doptk above u4nimum treatment design depth (Figure 1) should be provided for waste steerage between projected pumpdown events. The exact amount of storage planned will be dependent upon the managplan. At least 90 days of storage should be providea in mild alin&teas more st=age will be required iz II colder climates to avoid applying treated effluent on from ground Cr ing patterns should also be considered so that effluent may be hold until it Mm be effectively utilized as a crop nutrient source. Additional depth should be provided to allow for precipitation from a 35-year, 24�bour stare falling on the lagoon surface and embartkme is when the lagoon is at the full level, lura capacity must also be planned if other surface runoff will enVwl the lagoon. An additional i ft, of freeboard Avertical dice between 272 y