The vacant lot next to the Naugatuck Event Center is expected to be excavated to establish a clean foundation for the eventual transformation of a new transit mixed-use development. The Board of Mayor and Burgesses unanimously approved at its Nov. 1 meeting to award a bid to Red Technologies of Portland in the amount of $213,825 for the excavation and disposal of polychlorinated biphenyls, or PCBs, and contaminated soil in the vacant lot at Parcel B, the 7.75 acres at the corner of Maple Street and Old Firehouse Road. Hess said the removal of material doesn’t mean the borough won’t find something else later but all the known PCBs will be removed and any possible remaining PCBs will be a low enough level to allow workers to build over or cap it. Stewart expects the work would start this winter season and the work can be done as long as the ground isn’t frozen over.