Monitoring Air Sparging In Complex Aquifers

The success of air sparging depends on the size and geometry of the region of air flow. The purpose of this study<br>was to use BRT surveys to observe changes in saturation, and thus air flow in a complex aquifer.<br>This paper describes the results of ERT surveys to monitor air flow in a heterogeneous acquifer in glacial till in<br>Washington State. Most of the air flow was confined a single, thin layer. Within this layer, the flow was not<br>uniform but moved preferentially in one direction. Some flow also occurred in a shallower layer but there is little<br>evidence of leakage into the upper part of the aquifer. After sparging there was a great deal of air trapped within the<br>layers.