Identifying Subsurface Water and Drainage Challenges

What happens here

During excavation, extremely wet soil is discovered, with water actively seeping through the hillside. A worker demonstrates how easily a shovel can be pushed into the saturated soil, highlighting the lack of stability. This confirms that water infiltration was a major contributing factor to the landslide. The presenter mentions that ideally, a 3-foot aggregate drainage zone with a chimney pipe would be installed, but this was not approved due to cost constraints.

Goal: Detect the presence of subsurface water as a cause of instability and evaluate drainage options.