Design/Operation

The number of injection wells required to effectively remediate the ground water depends on the size of the individual treatment zone created around each well relative to the cross-sectional area of the plume. When you install an ISRM well in Map View, the yellow circle indicates the assumed extent of an individual treatment zone created by injection. Individual treatment zones must overlap to create a continuous barrier of treated aquifer, which will encompass the entire plume as it moves through it under natural hydraulic gradient.

The injected solution is allowed to remain in the aquifer to react with iron [Fe(III)]-bearing minerals in the aquifer for short period of time (18-30 hours) and is then removed by pumping the wells used for injection. The result is a treatment zone (shown in yellow below) where most of the available iron in the aquifer materials has been reduced to Fe(II).