In 1995, the General Assembly passed House Bill 251, which directed the Clean Water Commission to use risk-based corrective standards to clean up underground storage tank sites. In 1999, the General Assembly passed Senate Bill 334, which directed the Clean Water Commission to develop a process to determine if risk-based remediation of groundwater was appropriate for any particular site. Although separate actions, both directives aimed to facilitate risk-based remediation decisions within the department. Later, Senate Bill 901 (signed in 2004) gave regulatory authority for tanks, including authority for risk-based remediation rules, from the Clean Water Commission to the Hazardous Waste Management Commission.