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 />
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