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r✓f.- �.G ¢j`•,.. .w ami <br /> -L .r� <br /> =a- <br /> =EM v L:.i '' 14 <br /> -� `+J gratioa �ouvc sailstv De _etzrcea av SO'- -0.-7 aor==:wn _s <br /> a-xcectea to be �igai__.caut '_cr :�i naszeuiar rai£h_ ___Ltics. <br /> parzicu1=ly ] C_Q. uigration is z aeted to b•. f-rStast :owzh <br /> .:revious'ly concaninated soils ==Here the Co=?t'-tee sites =av be <br /> unavailable; on the other hzod, soil-wata= content increases sarotzos <br /> -- <br /> and slows nsj&r=zi.om of aydroczcoons. :n =�Lasured =ack. the r-_g=at:,oa <br /> if hydrocarbons is much less unifo= t = =n 130ro" soils. ?refexen- - <br /> tial` spreading tt=ough e=csices. somecines ch=v,ing the d:raetion of <br /> flow, marl occur. Oete inatian of -he 2ozen==ai S_o�rtc-avatar <br /> aorr=irata.on is £issu:ed rock is thus rare dif_icuit (1-811). <br /> The water-soluble portion of NO. 2 f_-al 041 (a nirsner za arar=e <br /> distilling fraction titian diesel oil) vas shown to be alxosm antiralg <br /> aromatic (99+k) even though rhe p-roduct itself was =•88 aliphacic; =he <br /> aliphatic iisel oil hydrocarbons have very low water solubility coapaxed <br /> with the aromatics (1849.2238). The largest percentaxe (403) of the <br /> water-soluble frsccion of fuel oil vas reoresenzed by C..-aromatics <br /> (1849). In Veep, sart=&-.ed soils with no soil air. rhe axnmati_s <br /> represanc the greatest threat of cancaainaz�oa to oround•varar <br /> sunpuas. 5alubiliry in anuaous solution of polar. non-hydrocarbon <br /> comaoneurs of some higher boiiiL.g pa oieum -=aC=ons soca as diesel <br /> oil aad other fuel oils has also been raoormcd ("33)- <br /> In summary. the physical distribution o= fuel oil cantamirarion <br /> affects its i.-^pact on, and removal from. the soil eav"_ronmenc. natal <br /> spreading along the surface increases the initiial contami-aarea arca <br /> chile facilitating evaporative removal or sor^a=io:i �z ci-£erect <br /> hydrocarbons. Subsurface release or ver=icai penetration meciated by <br /> gravitation and capillary forces decreases avanoraz'_on. ceauces the <br /> importance of some rrans£or=acion path-jays (see below), !-:a May lead to <br /> ground-water conrauai•+acion. <br /> chotoaxid4ticn has been reported to play a signif_canz role in the <br /> chemical degradation of pecroleura hydrrcarho:is '-a ::he s=Uz <br /> environment (1845.1848,2252.2259.2337) . U%aues. banzenex, and <br /> aono-subs tituted benzenes have been shove, to be relatively resistant to <br /> photolysis in aqueous systaws: Y)rlenci� phozol}mea sloth: while <br /> zrisubstiruted benzenes and naphthaleres nnotoltiz0d at rates <br /> CGmDenitivc with volaziliz=3.om (1345). d.ea at 31. report that <br /> =thr.cene and other molycycl--c eromatic bvd_ocarbo:tic (FAH) the <br /> carbon range of diesel Z. Ira subject to p^otocee�cai • ocic=t-on: <br /> banzo(a)pyvere is the m,)sr. suscevtible of = e PPI compour-as, sucgescing <br /> that che. re: .:!-"al fuel oils may be even More ?netted D <br /> anocode gradation than diesel otl. 2e.^.ec_at:on of nil 'be-ow a soil <br /> surface limits e:coosure to solar radiation uhi.le exrP-7.4; '-aterai <br /> spreading of oil over :=ermeacle or .rocky :urizees ssv <:omoLa <br /> substancial photooxid.at:ve degradacioa. Tho aRgenaced of <br /> chotooxidaLion are generally =ore water-soluble =han ,the =anent <br /> hydrocarbons and are trxZ more is isa-ly zo be laachad fium soil. elt—l"-1i <br /> [oxiei�j of the o:cvgenaced hydrocarbons has also been 0osarved ;2248. <br /> ?252). <br /> �•�5 <br />