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` • • Dissolved-Phase <br /> Transport Model <br /> ,i„ -,�, _ .{^ —+ _•,,.,s, '--7a : _ r. z„a "ar r I r <br /> �r��yagf 't� .".x •rt Nf 'i_ X85 �yq r�a�a�J }L , �#. '-F�$` 5a-(;3`i #„p <br /> B 'i�kMODEL°DESCR �rt, <br /> The groundwater model in RISC simulates dissolved phase contaminant transport in <br /> the groundwater aquifer This model can be used (i) to predict the concentration in <br /> groundwater at a "receptor well", or, (ii)to predict the concentration in groundwater as <br /> a source for volatile emissions into a building (see Appendix E) It is appropriate to <br /> use this model either when soils data is lacking,or when the groundwater at the source <br /> is already impacted and it is not necessary to model the soil-to-groundwater pathway <br /> . To run the model, the user defines the source by specifying a dissolved-phase source <br /> concentration, the pulse length (which simulates how long the source is active), and <br /> the volume of the source Figure B-1 shows a schematic of the dissolved phase <br /> groundwater model and the processes simulated <br /> Well <br /> "i p•.; zW 0� <br /> q,pvy�'#.=�'-''A <br /> ^lg ,. Irl• {�l,� <br /> ° 7a; =tea in/ <br /> � w"''n��r�' , i� y. 1, <br /> yy +e` <br /> zFii� v oe�;K Vadose <br /> �r,•a"�s.; �A ��,�°y�u¢ -�.ac's`��i+4 �asc��u����p, +���,r,v �';�� ZORe <br /> ¢j�l �a 'aR {� c� CpOSI�rBf�l[ a� ,rL�r e <br /> Source <br /> 5aturated <br /> Zone <br /> FIGURE B-1. Saturated Zone Model with Source in Groundwater <br /> • <br /> B-1 <br />