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Helium and Neon Groundwater Tracers to Measure Residual DNAPL

Laboratory Investigation

^a Department of Geology and Geological Engineering, Colorado School of Mines, Golden, CO 80401
^b Department of Geosciences, Colorado State University

View larger version (25K): [in a new window]   Fig. 1. Helium and Ne batch equilibrium partitioning isotherms: (a) He tracer with trichloroethene (TCE) nonaqueous phase liquid (NAPL); (b) Ne tracer with TCE NAPL; (c) He tracer with tetrachloroethene (PCE) NAPL; (d) Ne tracer with PCE NAPL. Isotherms are plotted on log-log scale to more clearly show partitioning behavior for the entire measurement range. Confidence bars indicate analytical instrument precision.

View larger version (17K): [in a new window]   Fig. 2. Tracer breakthrough curves for columns constructed with (a) STCE = 5.2%, (b) 8.3%, and (c) 9.7%. The results of two separate tests conducted on the same column are superimposed for the bottom figure.

View larger version (19K): [in a new window]   Fig. 3. Comparison of actual versus calculated STCE values for the column partitioning tracer tests.