Aquarion is set to start a water main replacement project in the Sandy Hook section of Newtown.  About 7300 feet of water main will be replaced starting next week and residents are cautioned to expect some traffic disruptions.  The work is expected to last through late fall.  The water main replacement will begin on Underhill Road, Round Hill Road, and Bankside Trail, but the other streets will see other preparation work performed as well.  Construction work is planned between 7am and 5pm.  The other streets involved are Alpine Drive, Cottonwood Trail, Cypress Trail, Engleside Terrace, Forest Drive, Locust Drive, and Shadblow Trail.