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0 0 0 1 <br /> 3i2 pET€1OLEUM CONTAMINATED SOILS ESTIMATES FOR HYOROCA#BON VAPOR EMISSIDNS <br /> 01 PH20 = balk density of water 100 g/cin' <br /> DI C'11`9 Cr, = lotal hydrocarbon concentralion <br /> vpd.miul rpi>~mair -- 14 <br /> ► in soil = 001 g-gasohnclg-Slid <br /> { CI17 -[I} — �� x, = benzene reale fraction in gasoline = 001 <br /> 001 X. T 0.03 and the%slues given above in jilt Iii for P,-, M„., R.7. and D,u 7 he one ho <br /> average flux <ff3j,,,>,,,,,,,, for these values is <br /> x+= 0.02 <br /> <�fpri>I,,«,►=3 U x 1 f}-� glctn2-d �- <br /> Xi =0.01 <br /> O1101 = For a pile with a 37 m2 (a 20 ft x 20 ft pile) surface area, that is only ua, <br /> 'Ka!k�P<T'Y tri <br /> ----------- vered for the duration of an 8 h shift each dav, the daily average emission +. <br /> <&,A> =370 g/d <br /> 0 <br /> This is calculated by multiplying the one-hour average by eight <br /> 0 2 4 6 8 10 <br /> Excavation Depth (m) <br /> Figure 7 Benzene emission estimates for excavated pal <br /> Psoil,av '"' DIof Cq 2 tieaizene(2{1C) <br /> soil Lv T X'=001 <br /> CT.,=041 m&/kg <br /> For a 6 1 m by 12 2 m(20 ft by 40 ft) pit area, this corresponds to a maximuni (gfcm2-d) N 16 glans <br /> benzene emission rate &Ps,Mal em =(}05 g/g <br /> Cp,ma.=58 g/d ET=0 38 <br /> f]1 {I <br /> A less conservative, but more realistic estimate can be obtained from Nuallon <br /> 8 which models the transient period before a steady-state flux is established The <br /> three-day average flux C� >g J,�, and a�emge emission rate <SP11>3A,,, are <br /> <3F,>3,,=2 9x10-5 glom'-d <81`11>3,4„ =22 g/d ; <br /> ' soil <br /> It tb Emissions from Exposed Piles of Contaminated Sod ' <br /> ODI ill <br /> Figure 8 preseaits emission rates predicted by Equations Ib, 15, 11, and 5 for 0 20 40 64 SO l00 l20 <br /> the following parameter values Time (tni 1) <br /> Figure 3 Benzene vapor emission estimates for exposed soil piles <br /> ET = total void fraction in soil = U 38 <br /> Pb = soil bulk density = 1 6 g/cin' <br /> 0', = soil niolilum consent = 0 05 g-waterlg-soil tl/ 10 Soil Pile Emissions Experiments <br /> p„G = hydrocarbon liquid birll, density = O 80 glcni` <br /> M„ Sail pile emissions experiments were "inducted with tire apparatus pupli <br /> T = equi3aleril trKrlecular ►+right ofi <br /> 0 4-dell; - I(W) t!`nloh' m I rPllii l) 1 it ,i 4'11 ir'Ni (I ? rrirar chriiur IL i) <br />