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oa.bon `_ltsr e=o:e __s-::a:y? in order to decrease .h drocartcn <br /> 9 1�SSiC:-S iia0 tc :? a:-=SDG?.9 . Lkct1-7e aeration ac:Teves <br /> red-,ct_on of the ::SL'c Mcre q"4c'- !7 t a n the passive <br /> Method and res-__ts -._ e'a�SS:�:l Oi r.Cli'::a^t3 tC the <br /> a t=csahere . <br /> E.Ird LACED NATUMALL DEGRA::,A,":CHTM <br /> A=t,-0ugh ,,.cth met::cds dascra-c-,-e a ch,ie.e red•acor. o:. <br /> lzquid-mase ccrta.'14 na=_.s in seg '' re e`fect_Je cnl;T i:. t':s <br /> .:ze a <br /> emcval of. vola time CC :C:e nts - i;l additic n, Su:lace tersicn <br /> causes an adScrIce» p.-lase Ci th9 Surace CF thB SO:i Wh- c'h iS not <br /> treated by either re` To treat bo-.1the non-7c?atile and <br /> adsorbed- Prase 34cicgical Deg.adation <br /> (E:I7 j met,-_d5 are as=�' 4n ccm' :a`icn •ori th cc =,sl-'-d <br /> aeration. :tat::_a_l. �r .w.r�:_ mi__obial ._cra c.-- car. degrade <br /> 1�. ^ ^ so at a ma.-timum <br /> hydrocarbon_ c^- _..a:_rr. a_e st_-uia�- t� d.. <br /> rate by add--�-n o. ..� __ _' :5 ncrmal y Scaroe3C_' , bLit <br /> i cr the de_:aG<st-cn to OC-lar- S:.�.C? <br /> the degradation �S <br /> an aerobic Process , c==sta =9newal Of air th=CLzg active <br /> astest degradaticr. rates . With this <br /> aera:;on :esult3 _.. t.e = <br /> cc„ib:.^_ed met hed, redL:c.ic:: o4 contiaatioz tc residual levels is <br /> obtained in <br /> a relat_-:e_-s s crier Period of time than elt her <br /> :,assive Or acti'le aerat:c- treatment 'methCds alone . <br /> S'_'STB.M CONSTRUCTION <br /> �e t system is depicted in Figure <br /> The active aeration '_eat -^. <br /> Ae at_= cSystem :�iaS=- . lcted drive pci..ts are inserted into <br /> t.'-.e^.2 soil .. <br /> ' e _ ._ erected tv a ig -vacau--a Mower and carbon <br /> _ .._ an <br /> yilter ( ar rh <br /> ecessa: wit- �ZiC M1Lz�n�ing. : e Clower size and <br /> nu.•acer cr drive Pc._.is ==_ d etarmi^a= by t e ty�e and amount or <br /> scwl , and the gecwet_ _ c :e rile constr�zcticr.. <br />