Hazardous Waste Program
The Missouri Department of Natural Resources began a long-term stewardship consolidation effort in 2012 to ensure long-term stewardship, or LTS, sites are properly managed. Creating and maintaining an easy-to-use central source for site-specific information about LTS sites on this website is an important part of this effort. Developers, planners and others can use this information to learn about use restrictions tied to the land and help the department to ensure property is being used safely. Keeping these activity and use limitations in place protects human health and the environment.
What is Long-Term Stewardship?
Long-term stewardship includes all activities necessary to reliably prevent residual contamination or other environmental conditions from posing a risk to people or the environment following completion of cleanup, disposal or stabilization at a site. Long-term stewardship activities include inspection, maintenance, information management and distribution and public awareness.
Risk-based remediation methods used throughout Missouri Department of Natural Resources’ cleanup programs allow sites to be cleaned up based partly on current and future land use rather than always attempting to return land and water to pristine conditions, and these sites require LTS.
Traditional LTS tools include:
- Engineered controls are physical measures that limit direct contact; reduce contamination levels; or control migration of contaminants.
- Institutional controls, or activity and use limitations, are legal or administrative instruments intended to minimize the potential for human exposure to contamination by limiting land or resource use.
Institutional controls are a viable risk management tool for clean ups when they are durable, enforceable and run with the land. The durability of institutional controls is a concern given that they may be forgotten, regulatory agencies may fail to monitor property use effectively, or property users simply may ignore restrictions. Engineered controls are a common remediation tool, but require maintenance in order to remain effective over time.
During clean up planning, decision-makers should weigh the full costs of such options, including capital costs, costs of long-term sampling and analysis and costs of replacing equipment, as well as concerns about potential long-term risks associated with contaminants left in place against the costs of options that would remove the contaminants permanently.
To review or obtain copies of department files, please make a Sunshine Law request.
For questions related to LTS in Missouri, please contact the Long-Term Stewardship Unit at 573-526-8913 or by email to email@example.com.
- Missouri Long Term Stewardship: Current Practices and Future Recommendations.
- EPA’s Institutional Controls Guidance.
- Risk-Based Corrective Action Technical Guidance’s Section 11: Long-Term Stewardship for Risk-Based Corrective Action Sites.
- ITRC’s Introduction to Land Use Control Management Systems.