ARCHIVED REPORTS_XR0003172 - Laserfiche WebLink

Home Browse Search

I ted 0MV oNTAMIPINITS IN SUBSURFACE ENVIRONMENTS � SECTIONS +e7 Jµ W CON/awlwrtvAFDlq }�"' � ,.$,. 5 K"«-C,�.i„�>- �� ,.�{Y"�. LGriii�tlQ �` s �; mid f K z ee �'.!`^ +1' LO tIdA1R0ATOM CdIDFRlETtQI °” ^^ S>+ ',y e�;� Y °-. '`!'+ .'`k` ,: '3 x�-� �s LO e IRDd9 r �"��„$ .?��'>M�� MIY�Id01►�tr'y6sr lf4W :€�i x r OIFPI4FAN $a� X: 5 >e. I MLGAFfE CIFFi18101i >t f. 3'I.x w M #S 'e' .rf ..... ',".:`.: `y« sK m 01RD4R � µms' ""a"':,�^+, °" VlDIAM M 11irJ�[� e>" "-` L1q�Fl aere�n � M Looe: ell : OWDLVID _ ��IgG07/TAIEfYIASflOr•TN6 WATE11 il CWG11 KDWArER71aE of" POIRVIATIMr- S LO rifMMAS10N r '$:,3�`t. '9 'A":�" QL W NPLPATM in tMrlyd �. t -4 w.r.rlM. �DVFrCTTDII _ 'ik .E# ryray�# DYgI1atGN� +wf i' Figure 7-3. Schematic of Immiscible Squid contaminant accumulating upon a I deflected water tante AO,K�f"ID Nom►DRWTOILPOTCLEW�oWK infiltrating rainwater and the attendant fluctuations in the waiter table .V+��ow surface The rise of the water table covered with liquid contaminants .VXX1t,AAGTUIlS will probably increase the dissolution of liquid contaminant into the L141"RATHER UP AND water of the vadose zone the fate of which is described in Sections 110>f RATHER TME NF'1W D ODIMI wDYFN[yF 1 ONU1a :LE�vEua�ooDwr,woaRts OfN453 2.2.2 and 12.2 2 2 Rpm 7-2. Schematic repre.entatlon of important transformation and transport 7.2 2 2 Tfanspod ofl th Mobile Phase -n processes affecting other bci Contaminants present in locus 7 are,by definition,mobile The trans- The addition of hydrophilic compounds such as methanol, ethanol, port of liquid contaminants within this locus is governed by Darcy's law (see Section 6 2 2.2) with the fluid conductivity of the porous medium �I and methyl-tertittry-butylether in quantities or as much as 10% by vol- appropriately scaled io reflect the kinematic viscosity of the liquid -- ume may result in gasoline solubthties of greater than 2000 mg/L(Ly- contaminant. man, 1987). Site-specific factors such as ambient temperature and pres^ The saturated hydraulic conductivity of a porous medium for water sure, pH, salinity, particulate matter content, and concentrations of may be scaled by the ratio of kinematic viscosity of the water to that of ' other compounds in the aqueous phase also affect dissolution. the liquid contaminant to obtain a fluid conductivity of the porous Dissoluttoa reduces the mass of liquid contaminant in locus 7. The medium for the liquid contaminant: rate of dissolution is affected by the concentration gradient across the liquid contaminant-water phase interface: the higher the gradient, the K, = K.(r./r,) - 17 1) greater the diffusive flux across the interface. SecUotn 1.2 2 2 describes the process and mathematics of diffusion In greater detail. The advee- where Ko - fluid conductivity of a porous medium to a liquid con- tion and diff mon/dispersion of the dissolved contamiumts in the aque- taminani (cm/sec) ous phase of locus 7 effects this concentration gradient and is discussed K. - saturated hydraulic conductnity of a porous medium to in Section 8.2 2 2. water(cm/sec) a l Dissolution of the liquid contaminant is facilitated by contact with yo m kinematic viscosity of liquid contaminant(cmilsec) ar, - kinematic viscosity of water(cm'/sec)