EDISON - Homeowners in Middlesex County say they took a risk when they bought their homes on land that was once part of the Raritan Arsenal, but thought any related problems had been corrected.

Now, the residents living in Centreplace at Edison are finding out that bombs and grenades could be in the ground just feet away from their homes.

The federal government is investigating an area near the former Raritan Arsenal that stretches from the river all the way up to Woodbridge Avenue. Acres of land were cleared when the homes started going up in 2007, but the adjacent woodlands are part of the area in question.

"For the long haul of the project, we definitely want to do a site closure, making sure we clean up all the areas that we know," says Sandra Piettro, a project manager for the Army Corps of Engineers.

The Army Corps says it has identified at least 17 suspect areas around the Raritan Arsenal. In one location, investigators discovered a trench where WWI practice bombs and grenades are known to be buried.

The government says there are no munitions on the Centreplace property.