As construction activity continues to pick up, more developers are focusing their efforts on leveraging opportunities offered by infill development. Infill development is widely seen as a solution to urban sprawl, accommodating urban growth and revitalizing neighborhoods. But using underutilized land, also known as Brownfield sites, for residential and commercial development brings unique challenges: many such projects are on sites with long histories and a high potential for environmental impacts, and innovative remediation techniques are needed to adequately manage risks.