Alexandria’s waterfront has long suffered from a chronic problem: every time it rains hard enough, the city’s aging combined sewer system overwhelms—sending untreated sewage and stormwater directly into the Potomac River. The RiverRenew Tunnel Project is the fix. And Illest Environmental LLC is the team making sure that fix doesn’t create new problems in the process. The Problem With Building Near a Stressed River Urban rivers don’t get a break. The Potomac and its tributarie