Characterization of residual NAPL using partitioning tracers: temporal moment analysis.

A stochastic Lagrangian methodology is used to derive expressions for the temporal moments associated with transport of partitioning tracers through an aquifer of spatially variable hydraulic conductivity that contains a heterogeneously distributed residual nonaqueous phase liquid (NAPL) phase. The resulting statistical moments of the Lagrangian variables are expressed in terms of the statistics of the hydraulic conductivity and the NAPL content for the special case of a perfectly stratified aquifer.