Problem: Concrete Front Porch is hollow underneath. A family of skunks has moved in and the basement wall is leaking when it rains heavily.
Evaluation: Backfill from the basement foundation construction has settle over the years. This open cavity is even larger underneath. Water from a close by gutter is collecting in gravel landscape rock then running into this even lower spot under the porch. This water could be the source of leaks in the basement or unnecessary water flow through your drain tile.
Strategically drilled small holes through surface of the porch.
Slurry viscosity was determined by size of the void to achieve optimum flow to fill void thoroughly.
Slurry was injected into the void starting at the closed end of the porch thus forcing any animals towards the open end until they are forced to leave.
Further recommendations to this customer include the following:
Correct gutter runoff to ensure it does not drain into backfill areas next to basement wall.
Raise the level of dirt underneath existing gravel to correct water runoff. Then reapply decorative rock or mulch.
Just applying more rock will still allow water to pool. (Dirt is needed)