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 What Tracers Can Tell About Effluent Transport to and in Groundwater
Eberhard Roeder
Item Number: NRL2006AC-8
Shipping Weight: 0lbs. 0oz.
Price: $20.00
Tracer tests are frequently included in studies of environmental impacts of onsite systems. These tracer tests serve to establish that there is a connection between the onsite system and the monitoring point in question. Frequently the travel time and relative amounts of tracer are utilized in a qualitative way. Tracer tests also provide insight into the processes occurring along the way. The objective of this study was to move toward a semi-quantitative analysis that includes the effects of dilution, dispersion, and dual porosity; and compare predictions of effluent concentrations in the groundwater plume to the respective measurements. The data stemmed from tracer tests performed at two sites during studies for the Florida Department of Health. A solute transport model with automatic calibration capability (CXTFIT) was used to estimate effective transport parameters to match data and predict effluent concentration and dilution in groundwater. The results illustrate utility for understanding tracer transport and assessing the relative importance of dilution and removal, e.g. of nitrogen in groundwater. A travel time estimated from the tracer test is not necessarily an indicator of how quickly effluent concentrations in the groundwater change.