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-.�VTHIiErtTnL :.liT :D c_?�SLnc.�Ainu�.YS <br /> r <br /> r� d1SCussinxi nL -fig- e- —cnL11 �enavlar om —,z oil <br /> :3v the Lack of dau deal a� -=- is Limited °�, <br /> 4.cs major comnonenc.s. the environmental <br /> behav-Lor of hvdrocarbans seiected :rom "1t. major classes will be <br /> addnor- b ssp however, trace eiemencs and the rsaisv diverse additives Lill <br /> nor- be speeificaily addressee. tippy at chs hydxnearbons characteristic <br /> of diesel fuel have been aadressed <br /> environ=ental face sect an of `he Jp``reviousiv in the more extensive <br /> :re camman to bocn chapter since these hydrocarbons <br /> aliphatic and aramarzC petroleum =ttels. The general discussions oC .� <br /> soil/ground-water systems uiLlhydrocarbons <br /> rnat r be srepeaced here; chenain <br /> refeadex is <br /> erred <br /> to rhe relevant sections of Chapter 64. <br /> bb.2.1 Equilibrium Partitioning hodel <br /> Ineneral. <br /> s <br /> coneenrrations soil/3rauna-water transport pachvays :or ,ow <br /> of Pcilucancz in soil can be assesses by using an <br /> equilibrium oartzcioning model. <br /> cr ;:'te purposes of assessing <br /> r;z <br /> envirommanLal c..:nsaort <br /> hydrocarbons of <br /> diesei fuel. a group of specific <br /> Las seLectea from the dominant. hydrocarbon classes, <br /> alkanes, cvciaalkanes , and aromacics- <br /> confirm the Presence or {here were no available data co <br /> Sample. t.`.e selected compounds in a cypieal diesel fuel <br /> P Table 66.3 identifies the 'selected hydrocarbons and presents <br /> ttte predicted partitionin of •� <br /> hydrocarbons among3 pow soil concencracions of chose <br /> soil particles, soil water, and soil air. The <br /> e *` <br /> xpected associated with tate -acer and air phases of the soil '- <br /> expecteto have higher -abtlicv• than the adsorbed portion. ;re <br /> Escimaces for <br /> the unsaturated cgpsoLl indicate that sorption is <br /> expected Co be an iaportanc Yracess for all the domxnanc hydrocarbon <br /> categories . Part:cionin3 :,� Che " <br /> iQoartant than zor other sail-vapor phase is much less <br /> aolecular vex =ecrateura distillates since many of the laver <br /> 3hL Lliphaczc hyaracarnons (C. -CQ) CharaCCEritad by high :r <br /> vapor pressure arta lou v <br /> acer ;olubilicv are not expeeced co be. ma)or <br /> components oC diesel fuel . ;he aromatics have slightly higher water <br /> solubilities and transport 1 <br /> important tch in£ilcrating vaeer may be more <br /> P far these comeneinas- •roLacilisacion. on the ocher hand. Ls <br /> not espeeLed ca be imporzanc. in sacuraced. deep soils (cantsining no <br /> soil air and negligible soil organic carmon) , a significant percent of <br /> tate aromatic le <br /> phase and :s Predictea to significant <br /> �sr n it <br /> be present _ ce soil-wacer � <br /> ParLig c1onin anspart Lich flowing ground *-acct_ <br /> ca `he air and Lacer ;.stases Ls e�cpecced co be even less <br /> important for i <br /> t e organic components GE resxdual EueL oils compared Co ' <br /> signifencs of d,esei ail _ sorption co satL Par=ities is expeccea to be <br /> significant- <br /> da <br /> In interpretingt:tese <br /> model is v results. iL oust be remembered chat chis <br /> slid only '.ov soil concentrations <br /> solubility) of ,::e cnmpor:ents. r (below aaueaus <br /> leakin under Larne releases of diesei fuei <br /> 3 underground scorat2 r;zks) nav exceed the sorpc-ve cauaclz:' of r <br /> the sail. Zhereav tilling znp- pore spaces of the sail -ich t::e Euei.. <br /> -z/S7 a S <br /> f <br />