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05126/2009 13:14 9518273349 DOUGLAS KUNEY PAGE 05/09 -ILY.36 l AnaerODIC Lagoo115 tOf Storage/treatment of Livestock Manure I University of Mi. Page b of 10 Lagoon design--Geometry Cbmiar or square lagoons familbite mlidng and are usually mora fton6mhxI to Construct Rectangular lagoons may be used,but langthlo-wldfh ratlos of 3:1 wless are recommended.Avotdarrory appendages isolated from the main G7 body of water:they mbdte Gare volume and may be a source of nutiamw conditions. Minimum depth should be 8 foot although 8-to 20AW depths are typlk�i depending an animal numbers,runoff area, slope and underground geology.Deem lagoons offer these advantag�rs: a A smallat surface area regtdrktg less fend. • Mar®thorough mixing of lagoon owA&t9 by rising gas bubbles. • NNnimum odors. s Ling ammonia lose to the atmosphere, r t fAofent use for mechenW Aeration. Earthen dike and bank slopes usually rangy from 2:1 to 8:f.A 6"OfL A Of IOU is r000rnmendod for ft establishment of vegetative cover and for safe mowing.A minimum to tod tap width la recommended;however, greater widths may be desirable far operation of tractus with agl4 tprss, Art ernafgency spillway should be provided at a minimum on of e foot aw the top dF the berm of w 41lawarm is mach for eettiamerd.It should to loimted as Close to natural ground As poesi .The spillway is irrftnM for dam protection only In the case of extreme tleedinrti aivi is neo fe Be uRM as:a zplUway in Iiau of pumping down thm Motion Construction techniques--Sealing Proper lagoon construetlon wig ensure groundwalor r osaun:ss aro orWC10d and i<1t MOM will perform 08 Mulmd during Its useful Igo.The fenelvtog steps aro tnoluded in most gulddfine-for accepted Construction techniques and methods for tagoafrs: 1, b1ta pn"iau4rr M trees,grass and aganie matter should be removed from the Topsoil Should be M**pW1 xQacentto the aoostr clion oft for later placement on the top and exposed slt>p�a for estoMMIng gross cover.After the foundaygn m"is Wpped,it snouts be prepared to bond Wriilt the fill by removing loosic dry mottrioili scAffyiftg: disking;ad]ue8ng molature;and compaWng as necessary, 2, Certp}ftrenah A outer)trench msy be required to remove sand,gravel or otherIter-wriducalngj materials to prevent leakage under the etrnunkme t. 3. Ercavaftn Rooks,sand tenses,gravel and other materials not suitable for oe4ng should be removed from the impoijodn, art Fws;v"inn ahnddei i)p ndrf r.Ww to rmnAmnt m e Pl m whonn to MAArimQ prttjm.1>o mn vemltmtda 4. t3mbenkmenta Lagoon embankments should be c onstrurted to allow for ce ting usually 5 percent extra),mowing and exosion prevendom.Subble excavated materials free at sod,moil,froxer sell,atones more than 6 hrahes M diameter at other abo ti r"a material should be used for fNi.The minimum ftistum eonteM of the fill matehaland foundaton should foml a hall when kneaxded by hated drat will not seedy separate.Experlenae has shown that With Suitable=1 material,three passes of a Wx mpsfcat rdller(Fl ure 2)per french fill lilt an the embankment or bottom seat will provide adequate cwpBCdon far sealing. 5. seat ctynaOtWWn Lagoons must have a seal on the bottom and sides suffidaTedy Im Dermesble to prated groundwater.Sam! onotrvalon guidelines generally call for oWGhexCaVatlan and recdnlpitcdon of seal rrtatafal in lfl#oat exceeding a chanes Comp ima 090th(not more than a mamas deep b rora obmpamfl).r me tower a manes or are bolted! seal may be acarRled and coMpaoted In place to ellmfnste removal and replacement The seal material shauid be within two psrcont WOW and kw partant above the optimum moisture coni¢ntfarcompaetiori.In general,a minimum are 1 4cotdhlck clay seal must be provided on the batbohr and sides of a lagoon,The deeper tlta lagoon,the thicker the required seal,up to 4.8 feat thick for a r depth of 45 favi.A given paimmbdity or leash rate,such as f x 1 p-7 centil onus par socend.is a typical seal cOarlstrudion spsciftcawn.Soil amsndmenes such as berrionits.sods ash or ard[idel liners may be required to obtaka proper seat.The lagoon seal should be c*Verld With WOW irft n tabgly af4cr ecnebuation to pravont dryi i aM&ncldno(at Foch trio foot Above rho highest bottom.elevation). i i Figure 2 A sTttlepsfom roller is commonly used to compact torr Itay semi durt is r-wdtr=ipn of a tanoon. i i I i ht :/Icxtrnsion.missouri.edu/publications/DisplayPub.aspx?P=EQ387 i 5/21/2009