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Welcome to the Sunday edition of CNN Five Things, I'm David Rind. And today I'm here with

CNN's Isabel Chapman from our investigations team. Hi Isabel.

Hi Isabel. Hi, thanks for having me. So you recently came to us with a big environmental story that I know you've been working on for quite a while now.

So where does it start?

This story starts in December 2008 when there was a coal ash spill at a power plant near Kingston, Tennessee.

Tennessee residents are watching their homes literally drown in a sea of sludge after a...

It was an environmental catastrophe. It killed fish, it affected the river nearby.

A tidal wave of water and coal ash burst out of the plant's retention pond, cascading sludge onto 300 acres of surrounding land and waterways.

There's an iconic photo that people may remember seeing of a white house buried in coal ash.

What goes to your head?

Depression, really.

I mean, it's so sad because it was so pretty here.

It was a billion dollar cleanup.

It took years. So I guess that leads me to ask what is coal ash and why did

it cause such a disaster? Right, so most people have probably never heard of coal ash, but it's what's left over when we burn coal.

It's the residue and it's toxic.

So after this Kingston spell, the feeling inside the EPA based on the

...