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.��.. � -�=• � _ � "�-�� .. � z� �,�� Y u. �. - �� � ,� .�.r.��,�kir n <br />��� a?b�.� y' -ns . -' ,.,. ... .y, Y w"�e.' rr ?'�S`Y-.. _ .d� #rte,. �;, :.'• k. r.1�.�� _:�;, <br /> mom; <br /> iuEF OILS <br /> 66-:.1 <br /> 66.2 ENVIROhXL%;TAL FATE AND E:2O5U_RE-PATHWAYS <br /> A discussion of the environmental behavior of fuel oil is limited <br /> Dy the lack of data defining its malor components. The enviro <br /> behavior of hydrocarbons selected ::aa the major classes w <br /> addressed; nmenrill be <br /> however, trate elements and the many diverse additives will <br /> not be specifically addressed. aany of the hydrocarbons characteristic <br /> of diesel fuel have ber-n addressed previously_ in the more extensive <br /> environmental fate section of the JCP-& chapter since :hese hydrocarbons <br /> are common to both pecroleuca fuels. The general discussions of <br /> soiLhatic and aromatic The <br /> and [heir behavior <br /> in <br /> /ground-theer systems will not be repeated here: the is <br /> referred to the relevant sections of Chapcer 64, reader is <br /> fi6.2.1 Equilibrium Parritioning Model <br /> In general' soil/ground-water transport pa.chways Cor lou <br /> concentrations of pollutants in spit can be assessed by using an <br /> equilibrium partitioning model. For ;he purposes of assessing .-he <br /> envirpsuaeneal transport of diesel Fuel, a <br /> hydrocarbons was selected from the group of specific <br /> alkanes, cytloalkanes, a dominant hydrocarbon classes, i.e <br /> confirm the and aromatics; there were no available data to <br /> presence of the selected compounds in a typical dieser fuel <br /> sample. Table 66-3 identifies the selected hydrocarbons and presents <br /> the predicted <br /> hydrocarbons among Partitioning of lou soil concentrations of thuaa <br /> portions associated with c he+water and soilair tphasesndof soil air. <br /> asoil are <br /> expecc_d cc have higher mobility Chan the adsorbed portion. <br /> Estimates for e:a unsaturated topsoil indicate chat so <br /> expected to bean important process for all the dominant '.tedroc rbon <br /> rption is <br /> categories. Particianing CO the soil-vapor phase is such lass <br /> Import than for other petroleum distillates since many ac <br /> 4 molecular weight aliphatic hydrocarbons (C C the lower <br /> vapor pressure and 4- a3 characterized by high <br /> law vacer sr.lubilitr are not expected to be major <br /> components of diesel fuel. The aromatics have slightly higher water <br /> Solubilities and transport with infiltrating nater may be more <br /> important for these compounds: vplacil-zacion, on the ocher hand, is <br /> _ not expected co li important, in saturated, deep soils (containing no <br /> soil air and negligible soil organic carbon?• a significant zercent of <br /> _ :he arcmacic hvdrocarbons is predicted to be <br /> phase and available present in the soiL-vacer <br /> -^ Par[icionin <br /> for transport with fiowRng ground vatar. <br /> g co the it and water phases is expecred to be even Less <br /> important for the organic components oz residual fuel ails compared l co <br /> signifents of diesel oil: ;prpcian to soil parricles is expected .o be <br /> significant. <br /> rn interpreting these resvits, <br /> model is valid only :or -� must be remembered that this <br /> solubility low soil concentrations (belcu aqueous <br /> . ) of the components. La rre releases of diesel :Lei (spills, <br /> leaking and erpb vnd storage tanks) may exceea the sorpr-_ve caoaci[•r of <br /> the sail, thereby filling the Fore spaces of the soil -..rich tie fuel. <br /> 5/87 <br />