The object of the study was to demonstrate the feasibility of temporarily detaining storm and combined sewage in natural underground formations. Five sites were selected for subsurface geological and geophysical investigation for the purpose of determining which site possessed subsurface conditions most suitable for storing and retrieving storm and combined sewage. The geophysical work required six resistivity soundings as well as resistivity survey involving five traverses. Based on this work, three sites were selected for test boring. A four-inch test boring was made at each of these three sites. Two of the sites were too shallow for later demonstration of the technique. The third site was selected for the demonstration. (Author)