There are two components.
The board has the authority in this piece of legislation to order payment for costs incurred for cleanup. That provision doesn't exist today. If you as a landowner were impacted and had costs associated with dealing with an incident or that aspect, the board would order the company to do so.
Many companies in incidents that have occurred actually act this way long before being asked to do so and pursue these activities because it's in their economic interest and because it's what's expected of them. You can be told to do something, or you can actually do the appropriate thing because you don't need to be told.