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SYSTEM DESC�==TICN <br /> ?'i'r'RGDUCTIGN <br /> The treatment process described he=eir. c_-mbines controlled <br /> aeration and Ea:.ar_ce-d Vatural Degradation=m tc reduce the level <br /> of hydrocarbon ccr.;a.:._=anon in soils im=acted by kerosine, <br /> diesel `ael and c-_ . :,-­aid-phase d:ecarccns become adsorbed <br /> Onto the surface of sC_- :ar t_cies in the u nsat :rated soil due to <br /> s-,:--face teisicn. Vola-,_4 _7e ccmPon encs of the lia-aid phase vaporize <br /> r-- t .. i ,e -a ti.• 1 a,� i r o 0 <br /> z::t� e _airi::3 S S . ..pis. . +Ze 3i 5:2C et* n SGiI <br /> Particles . Cance is establis►.ed, t.i? t:1iC:CrueSs`' Oi the <br /> �..^.. 2d - v i rfl..al,� ,-.M v r rwv rod• a jlm <br /> t-�-.I the SC� _S S Co. -ar C the <br /> thicL :_ess and t:":L'S :e amount of tram=ed <br /> -ro-a tl-=o?d cc ncantratior. In the a4_ s,ace Must be <br /> :covered. This may be a_hlased passively, by agltating the soil , <br /> or active_.:, by Wecha:-tally cu11i.ag aim t =ougn the soil <br /> (f_ushi ng via ccntrslle: aeration) . <br /> PASS= AIMMITIDN <br /> passive aeraton of impacted soils is ccr�me:.ly performed by <br /> e cavating and spread_--_ cut the soil on a waterproof liner, then <br /> tu=ai.^.g the sail at ==ems ent i.tervals ( 2-4 weeks ) . The amount <br /> of soil whit:: can be treated by this method is limited by the <br /> level of contamirati:= and the required sum face area upon whit h <br /> t= hay t.e sort. . <br /> aaRAy+GN <br /> Act-4-;9 cr cent:ci?ed aeration is rerfcrmed by forming piles of <br /> the sc•1_ on a water:-_c_ _inar, inserting slotted pipe (wel: <br /> screen) in-:� the lower =crtion of the piles, covering the piles <br /> with a waterproof lln er , and withdrawi.^.S air t:rough the pipes <br /> via a high-vacuum b*ower . The air is then passed through a <br />