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About our Research Program
The mission of CCLR's research program is to provide a scientific
foundation to support progressive brownfield policy initiatives
on both State and Federal levels. Our research projects seek
to answer some of the toughest questions in the field, including,
"How clean is clean?" For example, our Screening Levels Database
(a compilation of cleanup numbers for common contaminants from
across the country) was designed by CCLR to facilitate creative
and substantive dialogue among states and federal agencies,
ultimately leading to the adoption of standardized procedures
for setting cleanup levels.
Screening Levels Database for Common Contaminants
CCLR has developed a Screening Levels Database, a compilation of cleanup numbers and methodologies from across the country. The database is searchable and relational and composed of three essential elements:
- Screening level data, organized by contaminant and medium for each state. Exposure pathways considered in the development of each screening level are included.
- Statistical and graphical analysis tools.
- Contact information, data sources, data entry methodology, and cleanup methodologies for each state.
In one recent example, a state regulator noted that his state's screening
level for a particular contaminant varied dramatically from
that of most other states. He subsequently used CCLR's database
to contact the appropriate regulators to discuss the variance,
which led to a re-evaluation and adjustment of his state's number.
The graph below provides an example of the varied cleanup goals across the country.
 View a printable version >>
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