Answer:
If both companies refuse to cleanup the hazardous materials, then the EPA will proceed to clean up all hazardous materials with the help of the National response System. Since the EPA has identified the companies responsible for this incident, it will seek payments for the costs incurred. The federal government will go after both companies in order to recover the costs (up to 3 times the costs incurred).
Explanation:
Once it has been determined that hazardous materials were released into the environment, the EPA must act as soon as possible, it cannot wait for those responsible to decide when it would be better for them to act.
The Superfund Law ( Comprehensive Environmental Response, Compensation and Liability Act) establishes severe penalties for companies responsible for the release of hazardous materials. One of the most relevant issues here is that the law establishes joint and several responsibility to all the parties involved, meaning that any of the responsible parties (Tyron or Sandoval) can be held liable for all the cleanup costs. If one party is not able to pay their share of the costs, the other party must pay them completely.
This law also allows the EPA to collect up to 3 times the cleanup costs from the responsible parties if they refuse to pay them immediately.