Potentially contaminated properties have indicators—such as accidental spills, leaking storage containers, or historical documents showing possible dumping of waste—that lead the Office of Land Quality (OLQ) to assess the site and establish if there is a need for further investigation. OLQ will assign the appropriate state and/or federal investigation and cleanup programs to manage further investigation and cleanup, if warranted. If OLQ determines that a location requires cleanup, then it considers it a contaminated property. Some of OLQ’s programs are only employed in the initial investigations. In other cases, the same OLQ programs that conducted the investigations may be involved in cleaning up (remediating) the property.