A 700-foot-long tunnel boring machine named Mary is being assembled in Washington, D.C., to dig a 5.5-mile stormwater and ...
DC Water took a major step Tuesday in the Potomac River Tunnel Project, lowering the cutterhead for ‘Mary,’ the tunnel boring ...
D.C. Water is making progress with an initiative that aims to clean up the District’s waterways — the Potomac River tunnel ...
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