Lisa Jackson recently left her job as EPA administrator amid an investigation into her use of alias email accounts. She apparently used those secret accounts to shield official agency business from Freedom of Information Act requests.

In one of those emails, recently obtained by a free-market think tank, an EPA employee mocked proposed coal ash regulations, joking that Jackson “knows which landfill’s leaching, She knows which pond might break, She knows they all lack liners, Close ’em down, for goodness sake!”

The Competitive Enterprise Institute says it has now received thousands of heavily redacted emails sent by or to Jackson and her email alias, Richard Windsor.