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,W .. � <br /> •� — _ � � <br />�r <br /> ..a <br /> r� I <br /> :21Y <br /> O Lat-lizari.on of <br /> C:.E Semas=iaz Dil *;au4c occ-r :-ark S_or:iv p3c •'-+2 <br /> iov vapor pressure. a cecially <br /> >~se uz <br /> :std because az swag sorption en sail r �_e nezvier _eight :Lel Otis. <br /> Ground-varex capL�m�r3Lion W_v <br /> _ the :tater table. resui; c_oa urge spii� pat zeaei► <br /> _here. tae more soluble :,==onem=z silt dissolve is <br /> the ground-water or fora emulsions with i=. The snla-'11 frac moa is <br /> maitsip aramaein and lover Molecular .eigaz allpnatic compounds. <br /> T s�xdv using -o. 2 fuel oil, 4.0ri of the wain one <br /> ter s�lublc x=act_on vas trade <br /> up of aromatic compounds composed of 11 carhop prams azo ?iq yaca o <br /> dissolved is et10 and 12 carbon atoms (2318). THe hs.ocarbotas <br /> gra=d s:acar r-ay move hundreds to thousands o= teet <br /> 3y cogparizon. the undissolved fraction, which ers.flaO <br /> tilt water table as a seoaratef phase, wows at the suxr f <br /> uld be sspecLad ra move a e o <br /> tens ometgss. unless cracks or fissures were present. y <br /> 1I--_ invetaenr of fuel oil components i-n Zround uata= may <br /> czntaa±riaaze drinking water sussplies, resul=ing in ingest,on a-poszS <br /> Ground-water discharges to surface :+azer or t7a aovcmnaz of <br /> coacaminared soil parzicles to surface jazer d=yring vazer loan :Es <br /> tui also result in ingestion axposures a.Zd _x dermal Exposures :.cm tilt <br /> recreational use of these waters. The potential also exit z :nr tie <br /> uptaa;c of polyaualeax .aromatic compounds in <br /> naa2xchalene. mechyln3phth:alene pad nigger -eight n Yel oil (r.g., <br /> ? by fish and <br /> domestic once ls, which map also result in puma-i e%pDsures. E=osu:es <br /> to nigh concetserations of furl oil component-.s in drinking water and <br /> food are expecred to be rare because Caimring becomes apparent at <br /> relatively low concentr=ations <br /> (482). <br /> 4 <br /> Volatilization of Duel oil hydrocarbons in soil is another <br /> potential source or at <br /> t ; tIMan exrosure. De iLe !:.air zelazively tow -fagot <br /> Pressurc.. the more volaczla components of fuel oil in saiilrvanarac2, <br /> satv.aLiag the air in tae soil pores. and diffusing in 411 diree_;ora <br /> including upward to the surface. Th <br /> the jxdiffuse into oascmenCs <br /> of .^ropes or other sLIL•C,CrtY : .e vapors may difft:'esvlt_n S <br /> e7tpes iosures to tho building's oc - g iM zalacion ' <br /> �'upancz. -=POsures may be more _ncensive <br /> when zhe soil is conCzMi.-3ated From leaking underground storage Conks <br /> components do not have <br /> and Pipes, rather than :=am surface spills. because -:E more :at:ea-t <br /> the soli. <br /> s <br /> an apun <br /> perci_v to evaporate before perecraz,a5 <br /> rvcn chin. this ctposure Paca.ay is expected to be coca -ass <br /> gasa�i.et for fuel oils Chan ror more volatile petrole= Protects i'te <br /> _ <br /> 66.2.:. Other Sources of Human Exposure <br /> !Data o <br /> n ambieaL concentrations z3f si r <br /> -ell as in food and ui_ -'n air .,ad rarer as <br /> dr :ing water are not readily availacla ::t tie <br /> lite!atatse. exposure inFe�ation on specif.c components m..y be found <br /> Ln other chapters of dais Cul <br /> to exposure to de• Several PoPttlation groups-sceottnle <br /> noel oil ttav be identified. ts?erronnei _evolved _z r <br /> [:eL <br /> k <br /> { <br />