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Work by the Colonial Water Co. to upgrade the town’s water system began Monday in the center of town near Highland Cemetery, and is expected to continue for the next two weeks, according to the town’s website. The work will interrupt traffic along Dedham Street to Haven Street. Work will begin at 7 a.m. and continue through 7 p.m. Monday through Saturday. Heavy delays for traffic heading into and leaving downtown are expected for the duration of the project, the posting at www.doverma.org states.