Vacant weed filled corner lots, neighborhood scrapyards, closed military bases and downtown parking lots. These are brownfields. Underutilized industrial properties where contamination by toxic wastes is known or suspected. The assessment and cleanup of brownfields sites has been a principal factor leading to urban decay. Recently, federal and state incentive programs have promoted redevelopment of brownfield sites. These programs have contributed to the gentrification and the displacement of existing communities, or to the deterioration of public health and environmental protection standards. As a result, low-income communities have been adversely impacted by government sponsored brownfields development.