Shallow Geophysics In A Hydrogeological Investigation Of The Oak Ridges Moraine, Ontario

In 1993, the Geological Survey of Canada launched a three year program to investigate the<br>hydrogeology of the Oak Ridges Moraine. This feature is a major recharge/aquifer system<br>affecting over 3 million residents in the greater Toronto area. The moraine is on the order of<br>160 km in length, covers approximately 1500 square kilometres, and in places the thickness of<br>overburden exceeds 200 metres. Because of the size of the feature, three type areas have been<br>selected for investigation. Extensive use of shallow geophysical surveys is planned before<br>deciding on the most strategic locations for drilling a number of boreholes.