Since 2008, at least 58 children in the town and surrounding area have contracted rare forms of blood and brain cancer.
High levels of trichloroethylene (TCE) and tetrachloroethylene (PCE), two known carcinogens, were found in groundwater and sewer vapors.
Residents were concerned chemicals vapors were entering homes and causing the dozens of cancer cases.
In August, Amphenol Corp. began removing or lining 2,600 feet of damaged sewer pipe. The company removed 4,700 tons of contaminated soil near the sewer pipes and also replaced the private sewer main connections of several homes.
The company will continue to test air quality in homes this year. It will also continue other forms of street and yard restoration.