8/15/2008

After nearly a year of digging, the Massachusetts Water Resources Authority has completed a 2.1-mile tunnel designed to rid Boston beaches of bacterial pollution caused by sewer overflow. Beaches in South Boston are closed about three weeks a year when storm water combines with sewer overflow and spills into popular swimming areas. After a pump station and odor-control facility are added to the tunnel, officials hope to reduce beach closures to one day a year.

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