Partitioning tracer method for the in situ measurement of DNAPL saturation: Influence of heterogeneity and sampling method

The purpose of this work was to examine the effect of porous-media heteroge neity, nonuniform distribution of dense nonaqueous phase liquid (DNAPL), an d sampling method on the performance of the partitioning tracer method for measuring DNAPL saturation in water-saturated subsurface systems. Experimen ts were conducted in an intermediate-scale flow cell that contained two dis crete zones of trichloroethene (TCE) at residual saturation. One zone (zone 2) consisted of similar to 10% saturation formed in the same sand as used for the flow-cell matrix. The other zone (zone 1) consisted of similar to 1 0% saturation in a finer sand emplaced within the coarser matrix. Aqueous s amples were collected using depth-specific sampling, using vertically integ rated sampling, and at the extraction well. A dual-energy gamma radiation s ystem was used to measure TCE saturation before and after the tracer experi ment, allowing the measurements obtained from the tracer experiment to be c ompared to a previously tested method. The saturations estimated using the data collected at paint-sampling ports located downgradient of zones 1 and 2 were approximately 7% and 50% of the true values, respectively. The satur ations estimated using the data obtained from the vertically integrated por ts were 0% and 6% of the true values, respectively. Finally, the saturation estimated using the extraction-well data was 30% of the cell-wide averaged value. These results indicate that the presence of porous-media heterogene ity and a variable distribution of DNAPL saturation can lead to reduced acc uracy of the partitioning tracer test. The reduced performance can be impro ved, in part, by using depth-specific sampling.