The state of Virginia was all "gung ho" about eradicating zebra mussels (Dreissena polymorpha) from the Milbrook Quarry...until they ran out of money. According to this article from The Virginian-Pilot, Wilson J. Browning, the businessman who was contracted to kill the invasive mussels, was informed that budget constraints prevented the state from funding the project. Browning actually invented the eradication technology, which involves cycling all the water in the quarry (200 million gallons!) through pumps that remove the oxygen from the water. He and another researcher have also recommended a similar technique (link to .pdf file) to treat ballast water. The state is continuing to look into funding options in the hopes of continuing with their project.