The earth covered magazines (ECMs) at many Army installations have severe moisture intrusion problems. This water intrusion causes deterioration and corrosion of ammunition and equipment within the ECMs, making many types of ordinance unusable, including sensitive munitions with sophisticated electronic fusing and missiles. The Engineer Research and Development Center Construction Engineering Laboratory (ERDC-CERL) was funded to assist in solving the severe water intrusion problem in steel arch ECMs. To address the problem ERDC-CERL recommended installing Electro-Osmotic Pulse (EOP) technology. This paper will present an analysis of the tests conducted and the test results.