Dickson & Associates was hired by a client that had received a clean-up and abatement order for trichloroethylene (TCE) from the local water board. The water board used local air vapor and groundwater survey data to generate a model that showed a TCE plume with a bullseye under the client’s building and with groundwater flows to the west.They concluded that the location of the bullseye indicated the source of the TCE contamination.
This proved to be an incorrect assumption in a high water use area like the one in question. In this site, there were bi-modal flows to southwest and south as a result of heavy pumping rather than to the west as seen in the basin as a whole.
Zach’s team worked with their client and impacted water users to collect data over a period of years to generate their final model. Data from residential monitoring systems and monitoring well data loggers was combined with several sources of historical data to gain a comprehensive understanding of the plume which cleared their client of any culpability.