Clean Harbors has completed surface decontamination at the Steamship Authority property and the South Beach Extension on Nantucket.
Crews remain on scene today, completing the decontamination process on the last surface areas on South Beach Street.
Clean Harbors will next concentrate on the decontamination on the subsurface utility vaults and conduits within the affected area.
A cost figure has not been put on the repair and cleanup of the sewer main break more than a week ago.