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PARENT SESSION

HP2 Global Perspectives on Soil Ecotoxicology
255 Portland Ballroom
1:20 PM - 5:20 PM, Thursday

() Development of Ecological Soil Screening Levels (Eco-SSLs) for the US Superfund Program.

Hoff, D1, Burris, J2, Ells, S3, Wentsel, R4, Russom, C5, Charters, D6, 1 USEPA Region VIII, Denver, Co, USA2 Syracuse Research Corporation, Denver, Co, USA3 USEPA/OSRTI/OERR, Washington, D.C., USA4 USEPA/OAA/OSP, Washington, D.C., USA5 USEPA/ORD/NHEERL, Duluth, Mn, USA6 USEPA/OSRTI/ERT, Edison, N.J.

ABSTRACT- The Eco-SSL derivation process represents the collaborative effort of a multi-stakeholder workgroup consisting of federal, state, consulting, industry and academic participants led by the U.S. Environmental Protection Agency Office of Superfund Remediation and Technology Innovation (OSRTI). The Eco-SSLs are concentrations of contaminants in soil that are protective of ecological receptors that commonly come into contact with soil or ingest biota that live in or on soil. These values are used within the ERA paradigm to identify potential contaminants of concern requiring further evaluation in a baseline ecological risk assessment. This is typically completed in Superfund's step 2 of the ERA process. They are NOT to be used, or adopted to be used, as clean-up standards. The Eco-SSLs were derived to eliminate EPA, and other risk assessors, from performing repetitious toxicity data literature searches and evaluations. The process increases consistency across regions and the transparency of soil benchmark derivations. The approach for deriving Eco-SSLs was similar for plants, soil invertebrates and wildlife. Generally, the approach included four steps: (1) conduct literture searchs; (2) screen identified literature with exclusion and acceptability criteria; (3) extract, evaluate and score test results for applicability in deriving an Eco-SSL; and (4) derivation of the value. These procedures were finalized as standard operating procedures prior to initiating any work to derive the actual values. The Eco-SSLs apply only to sites where terrestrial receptors may be exposed directly or indirectly to contaminated soil. They are only applicable to sites where key soil parameters fall within a certain range of chemical and physical parameters. The process has undergone 2 external peer reviews including EPA's Science Advisory Board and a public peer review workshop. As funding and interest remain, it is hoped that more compounds will be added to the list of currently available values.

Key words: regulatory use, eco-ssls, superfund, soils


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