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Natural acosyst:ea=s :ave con.,•-sderaaie exposure eco etraieum <br /> hydrocarbons *:_o= rtazurol emLzzLQr S, a <br /> ail spills and szoraize accidenrai can-=—jnat:ian throumn <br /> ^� 1 sass. ar.d ca L+L,araza aop licarzon to;a vas=e disaasai actz•: as ltzes Fsuca �aua.-fa Land <br /> Diode �a3; :.:zereinre, their <br /> 3radatiari is Of envlrCr.=ental l=or=a:lce. qL u=aroLLS auL}lcrs have <br /> ooserved the bzodegradazion 'o£ several M _ <br /> pecrcleus�s hydroca=pons, and.° <br /> exrenacive review" and reports are avaliahle (1$4b,2252.2255,22t�9 <br /> 2153 <br /> An exreaszve` and` diverse � <br /> degradirz s grau� of penolreum hydracarbQn_ <br /> g bacceri'a and fungi a-e widely dzsz.thuced� n ,the eraviranmer�e. <br /> kLchough the rascrahlaza oz _asi';'zori^canzamxrsazed soLls <br /> nclude <br /> naturally, occurring hyarecarbon-degrading po'pisiacions, cheL addition cr ■ <br /> vk f <br /> petroleum selectively enrzehes chat <br /> , h sector" able co adapt ahcL utilize <br /> the new substrate., �LOcher envLror=encai.'fisc=ors,}'shown , to ` t_" <br /> etf4cc ,ori �b�L4odegradabiZ 4 1�, LL dA "t° �� 7,A yx, ! hexa �l a m; <br /> �i p°s Ln ,AareJ' avaLlibUi�r ,Of" oXygel'1 lartd ma�dwrace <br /> , cep 34 mires.�,n ,3he�'�readerais•referred, to",Chaprer`o64 ',for= a mored tailed" T <br /> samsmarv, of the. biode '' 1[ § F,,, 16w _ <br /> gradaczan-ot pecroleum`hydraearbons <br /> = ir' <br /> The Qua 11 C2CiVehhvdraGarDOIt Con=enc e£ wpeCroleum miXt :reS <br /> recermtnes �:lelr d A nr Largely <br /> egraQabilicv ,""� IIn general., ,`alcrmorganLsmz exhibit <br /> 1eCreaSLriP1 abL'_1LV Co, de `` '" <br /> -�21n L'en ° grana aliphatic, �ttvdrocarbons with increasing <br /> gth:;=„aromaeics, are' enera"1 ' J "'" ' <br /> .u, g ly 'mare rapidly biodegraaed chap <br /> alkanes �,Thet campost'tiron„�+oc Fdi`c`s'e1^_;foil , suggescs'y chat some of the <br /> T `aoldrD=dC1C "l 1aA i , <br /> species . 3.11+1 ibe' Abtodegradable rblodegradacian az the high <br />" =oLecuiar 1eigLic° 3ramacics A°expeccedr}t be 'preserve , Liz residual ails Will <br /> f <br /> , be °slloweryr (2339,) i' ff y4 "'a r a, <br /> 0' f A h±k�,f {file�(�Ad� FYI 4 �l 4T'ry ry M i <br /> , 1, . , v , <br /> ' c [6 e,F F i iF Y lj < x 0 R a s 7 <br /> 'En , summary the petro L'eusas <br /> n i Fa �,fblodtgradatiGnh dh+OE[�wr 1Vdrocarbon5 <br /> t�c°mgt'Z�$L`ng F d'iese l !'arid` Eue l ,o L 15�,Isi3V�d OCCLir under> <br /> for mierobia'1 +acelvi'ty 'sad when ` k"� it condicla`ns" favorable <br /> �i �r fuel cossrponents” ate 'free/ ,ava,-JAb a to <br /> [tit ` mLeroorganism5�� ,'„>� �e rad3[lOT1 7 �' J�[, r y <br /> IeitvirOniIIel7ts{5� h''f�"�y de �5 pr, �aY s b-, � it8d _ and/or Slow in <br /> f cA�.._SSWM ' !1 JSh ' <br /> 'x gradtng organisms;< low pH lav cemacracures <br /> aha ' higtz-isaiinL{t•r= t'e g ""'1 arctic, envtrorimencs ) Ie should be mencianea <br /> t Walker [ec �3�1 <br /> (,2257) sc-Ice cha= even under opcimurn condreians <br /> vocal ann comp Lace biooegradacion iso noe expected co occur except <br /> possibly aver an -excremely Long time-period <br /> I <br /> 66 2.3 Primarv 'ROuce's of Exposure Eras Soil/Ground-Water Svscems <br /> The above'discusston of face pathvays <br /> nave lav suggests chat pure fuel oils <br /> �•aPor cheer pressure buc chat her coaieonencs •ary 'Ln their <br /> Volatile_-r from w'acer The comnonencs are strongly or % ery sorn4a to s0strongly <br /> il The pol%cvcl_c arcmaczc hvdrocarbons in fuel oils have <br /> a_- moderate- or High -jocenctal tor 5toaccurauiacian /hila the <br /> Longer-chain aliphacic comaouncs have <br /> bt4aCCut'SulsCion - LQV p0centlzl mor <br /> These :ate cnaracterLst:cs <br /> cOsuggest' char- the �-arious <br /> t1170nents mAv have Asomewnac 'dLfferenc potential exposure oachuays <br /> VOLaCL1lzatiOnd <br /> qac 1 of fuel 41L5 trams a dLsp05a1 site or spill would <br /> be ex acted <br /> a <br /> A , �� ' <br /> P co , result .a significant: Inhalation exposures co <br /> _Driers or residents " L•3 ::,Ie area Grav1C•• would sena to car bulk <br /> cuancic_es' o[ cue oil ' :a <br /> wn cawares 7-e -ater z7abLe Leaving only a <br /> 6/S7 <br /> r <br />