This document discusses sustainability issues relating to remediating contaminated brownfield sites. It defines sustainability and outlines UK legislation governing brownfield sites and pollution control. Brownfields are described as previously developed land that may be contaminated with materials like heavy metals, acids, or hydrocarbons. Methods for managing contamination at brownfields are discussed for sources, pathways, and receptors. The document questions whether past and current brownfield management in the UK has been sustainable and provides some metrics for measuring sustainability of remediation efforts.