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Intermediate-Scale Investigation of Nonaqueous-Phase Liquid Architecture on Partitioning Tracer Test Performance

^a Center of Experimental Studies of Subsurface Environmental Processes (CESEP), Environmental Science and Engineering, Colorado School of Mines, Golden, CO 80401
^b Korea Institute of Geoscience and Mineral Resources, 30 Gajeong-dong, Yuseong-gu Daejeon 305-350, South Korea
^c Dep. of Geological Sciences, Faculty of Science, Chiang Mai Univ., 239 Huaykaew Rd., Tumbon Suthep, Amper Muang, Chiang Mai 50200, Thailand
^d ARCADIS U.S., 630 Plaza Dr., Ste. 200, Highlands Ranch, CO 80129

View larger version (41K): [in this window] [in a new window]   FIG. 1. Schematic of the flow cell. The permeability field is represented on the top; the locations of the sampling ports are specified on the bottom.

View larger version (107K): [in this window] [in a new window]   FIG. 2. Intermediate-scale tank and details of the heterogeneous packing.

View larger version (31K): [in this window] [in a new window]   FIG. 3. Final distribution of tetrachloroethene and saturation contours obtained from gamma attenuation.

View larger version (52K): [in this window] [in a new window]   FIG. 4. Breakthrough curves collected in array A; the x axis represents time (minutes) and the y axis represents concentration (C/C0). DMP is 2,2-dimethyl-3-pentanol; HEX is n-hexanol; 6M2H is 6-methyl-2-heptanol; BR is NaBr.

View larger version (31K): [in this window] [in a new window]   FIG. 5. Actual tetrachloroehtene (PCE) saturation (Sn; line) at depth z and PCE saturation calculations using moments (dots).

View larger version (42K): [in this window] [in a new window]   FIG. 6. Reconceptualization of the source zone area for parameter estimation; S1 through S7 are value saturations in horizontal planes.

View larger version (15K): [in this window] [in a new window]   FIG. 7. Comparison of the saturation distribution obtained from inverse modeling and actual data (center of layer is in centimeters).

View larger version (22K): [in this window] [in a new window]   FIG. 8. Experimental (obs) and simulated (mod) breakthrough curves for 2,2-dimethyl-3-pentanol (DMP) and NaBr for Ports A16 and A17.

View larger version (19K): [in this window] [in a new window]   FIG. 9. Tracer partition coefficient (Kp) as a function of time for 2,2-dimethyl-3-pentanol (DMP).

View larger version (15K): [in this window] [in a new window]   FIG. 10. Comparison of saturation distribution between actual tetrachloroethene distribution and results from inverse modeling with the effective partition coefficient, Kpe.