Baseline Risk Assessment:    - Data Collection        and Evaluation    - Exposure        Assessment    - Toxicity        Assessment    - Risk        Characterization Remediation Goals:    - CERCLA PRGs    - SSLs    - RBSLs Risk Assessments ATR Associates' staff has performed risk assessments at CERCLA and RCRA projects for over 20 years. We are experienced in both ecological and human health risk assessments. We have prepared risk assessments under both federal and state programs using both the Superfund Soil Screening Level (SSL) and the ASTM Risk-Based Corrective Action (RBCA) approaches. Baseline Risk Assessments Most of the U.S. EPA and state programs that involve risk evaluation involve the preparation of a baseline risk assessment, or at least, the various activities that comprise a baseline risk assessment.  This it the basic 'information gathering' stage that serves as the basis for all subsequent analyses.  ATR Associates has performed numerous projects that involve:    • Data Collection and Evaluation       -  Sampling and analysis of environmental media       -  Statistical analysis of environmental contaminants    • Exposure Assessment       -  Fate and transport modeling in soils, air, groundwater & surface water       -  Linked groundwater transport from sites and vapor intrusion into buildings       -  Biodegradation and natural attenuation studies    • Toxicity Assessment       -  IRIS/HEAST       -  Re-evaluation of toxicological information     • Risk Characterization       - Calculation of Hazard Indexes and Risks for single contaminant and mixtures Remediation Goals - How Clean is Clean? ATR Associates staff has been answering that question since the beginning of the Superfund program. Once it has been established through a baseline risk assessment that a problem exists, it remains to calculate media concentrations which, if achieved, would reduce the risk to an acceptable level.  ATR Associates has performed numerous such 'How Clean is Clean?' analyses, and has saved clients literally millions of dollars in cleanup costs.  We have, for example:    • Developed cleanup objectives for CERCLA and RCRA Corrective Actions       -  Petroleum landfills releasing contaminants to ground- and surface waters       -  Foundry waste sites releasing contaminants to ground waters       -  Chemical facilities releasing contaminants to air and ground waters       -  Many, many, other situations     • Developed risk-based cleanup objectives for state Voluntary Action Programs,        including:       -  Illinois, Virginia, Pennsylvania, District of Columbia, Maryland       -  Developed commercial software to calculate remedial objectives under both             the EPA SSL and ASTM RBCA procedures    • ATR Associates is approved for:       -  Site Management in North Carolina       -  Subsurface investigations in New Jersey Contact us about Risk Assessments Back to Hazardous Waste Management Go to Brownfields and Voluntary Cleanups