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EPA On-line Tools for Site Assessment Calculation

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Required Input

The OnSite plume diving calculator requires input to

The single screen of the plume diving interface is used for parameter entry, reporting of results and graphing the solution. The following drawings show an exploded view of the interface.

Run Options
Drawing Options
Entry of Source and Well Locations Graphical Output
Calculator Output
Entry of Aquifer Hydraulic Parameters

Flow System Hydraulics

The aquifer is divided into segments and for each the hydraulic conductivity, recharge rate, and length must be specified. A uniform aquifer can be simulated by using the same parameter values for each segment.

Entry of Aquifer Hydraulic Parameters

Source and Observation Well Locations

Two heads are specified, one for the upgradient end of the flow domain at point (A) and one at the downgradient end (B). Within this domain, the locations for the source of contaminants and the well are then entered on the side panel.

Entry of Source and Well Locations

For a source that covers a large area (free product zone, landfill, etc.) the source location should be taken as the down gradient edge of the source.

The well location is used to show how much plume diving to expect at a point down gradient from the source. The well is indicated by a red line on the output that shows the difference between the water table (in blue) and the top of the plume (in green).

Graphical Output

Model Results

In addition to the graphical output, the depth below the water table is output, as is the over all mass balance error. The source and well locations are echoed in this section.

Model Results

Drawing Options

The features graphed on the drawing can be customized by

Drawing Options

Drawing the top (upper bound) of the plume automatically turns on drawing of the water table. When vertical exaggeration is turned off, the horizontal and vertical scales of the drawing are the same.

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