Reliably safe remediated construction aggregate derived from excavated contaminated spoil remediated with a system and method using a sorbent in a verified process of testing and analysis of spoil before and after remediation and of adjusting amounts of sorbent and supplemental water mixed with contaminated spoil.

A system comprising a plasma assisted vitrifier (8) configured to produce vitrified product. A feed pipe (4) can be fluidly connected to the plasma assisted vitrifier (8). The feed pipe (4) can be configured to deliver a feedstock into the plasma assisted vitrifier. A heated combustion air conduit (34) can be fluidly connected to the plasma assisted vitrifier (8). A spinning fiberizer can be disposed next to the plasma assisted vitrifier (8) and configured to receive the vitrified product (24). An emissions attenuation device can be fluidly connected to the plasma-assisted vitrifier (8) and configured to treat gaseous emissions generated by the plasma-assisted vitrifier (8).