Self Potential Monitoring Of Jet Fuel Air Sparging

In recent years, several remediation methods have been developed based on in-situ<br>oxidation. However, there are not efficient ways to monitor the effectiveness of these<br>methods in enhancing oxygen levels or delineating their zone of influence. In this<br>presentation we study the use of self potential (SP) geophysics to monitor the air sparging<br>and soil vapor extraction system at FS-12 on the Massachusetts Military Reservation,<br>Cape Cod, Massachusetts. Data has been collected over a time period of two years using<br>the gradient SP method with 130 permanent measuring stations. We have observed a<br>large 800 to 1000 mV SP anomaly in the region where the remediation system is in<br>operation. Using the Nemst equation, we convert the SP anomaly to the partial pressure<br>of oxygen, from which a contour plot is generated showing the effective area of sparging.<br>In this paper, we show that SP can be used to monitor remediation methods, which rely<br>on increasing oxygen levels in the subsurface.