A mechanic is dumping used car oil onto the ground near his shop. How might this activity affect the local watershed?

The oil will likely wash downhill without affecting any nearby water bodies when it rains.
The oil will likely soak through and contaminate the soil through infiltration.
The oil will likely poison local plants and animals that ingest it, but not affect other
communities.
The oil will likely be reused as a fossil fuel in the following weeks through fracking.