Homes and businesses near the former Polaroid property in Waltham will have to endure months more of daily blasting to clear rock and ledge from the huge construction site along Route 128. Waltham City Councilor Dan Romard, whose district includes nearby residential and commercial areas, said he was recently informed by the development team that blasting will stretch into next spring. City officials were previously told that blasting at the construction site would be completed by October.
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