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Vapor Transport From Groundwater <br /> � XL x « y�` r . � � wv,���-r�� a'�- �,7� <br /> 44 <br /> E:6 r {ASSUMPTION&AND'LIMITATIONS OF;GROUNDWATER <br /> 1 It is assumed that diffusion through the capillary fringe is the dominant resistance <br /> to transport so that pressure-dnven flow into the budding can be neglected <br /> 2 When the model is run in a stand-alone mode(not linked with a fate and transport <br /> model), the groundwater source concentrations are assumed to be constant (Figure <br /> E-1) <br /> 3 When the model is linked with a fate and transport model, the groundwater source <br /> concentrations calculated by this model at the receptor well are used as the source <br /> concentrations for the vapor transport model The concentration in groundwater is <br /> assumed to remain constant over each time step Figures E-2 and E-3 illustrate <br /> how the groundwater vapor transport model can be linked with two fate and <br /> transport models <br /> P� <br /> .i 'J. -•v .y. 7A p,}k' F y 'i�`di 1"�` t y.�... Is ,�. M' <br /> t ri w <br /> /1/�/ �` <br /> ft 2l�: %Y1 rfi �Gf�i!„ <br /> rG I i G i l f r�J� �/fi N <br /> aka Mi 'a'00 ` 1�sr l :�GRL�`1 Rt jtgf- fa >ra�A{Alt _ '�` 'P <br /> ,� �°'s'.w F� f�k.a� �:�f'yi y3+" �w�a i7Rui 53a�i*� �o�-�y:s P!•�'°fi � � �"�a� <br /> • <br /> Olt,; pati[lk g3�lp�y�cd y'��^p' 4 q�,Fh u l CY! <br /> �. Ki sI'3-n 1�C+�j J Sr d4tt�y i,"laa 'ayy r` R1t �` fi �. Ii({4u <br /> ♦! l t� aN 'a`ip.�-« d--. ��. 1? � p�Lf� 13�d Fac,. <br /> FydA ,. $� {3r �r4t'iRASir�� 63i` ''��� '��'��.�^ "'.Mi��.-�•� � '"� .r c�s "s��� <br /> �#ei•`�,a .c�ihvi' a {D "C� 'F i✓ w 7/ "4,R Y . # a.�.is <br /> 4�,1 � <br /> Source <br /> s w <br /> CgW at well <br /> location <br /> t 2 <br /> a <br /> Figure E-2. Vapor Transport from Groundwater Using a Saturated Zone <br /> Fate and Transport Model to Estimate Source Concentrations <br /> E-9 <br />