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In page Big Dig:

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In May 2006, six employees of the company were arrested and charged with conspiracy to defraud the United States. In July 2007, Aggregate Industries settled the case with an agreement to pay $50 million. $42 million of the settlement went to civil cases and $8 million was paid in criminal fines. The company will provide $75 million in insurance for maintenance as well as pay $500,000 toward routine checks on areas suspected to contain substandard concrete.[2]