lecture15

lecture15 - Lecture 15 Remedy Selection and Risk Assessment...

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Unformatted text preview: Lecture 15 Remedy Selection and Risk Assessment Superfund remedy selection Remedial Investigation Feasibility Study Record of Decision Completes characterization of site as basis for remedial selection Selects remedial technologies and alternative remedies Chooses the site remedy Requirements for Superfund Remedies • Protect human health and the environment • Comply with applicable or relevant and appropriate requirements (ARARs) • Be cost-effective • Utilize permanent solutions and alternatives or resource-recovery technologies • Favor treatment as principal element Criteria for evaluating alternatives Relationship of the Nine Criteria to the Statutory Findings Nine Criteria Protection of Human Health and the Environment Protection of Human Health and the Environment Compliance with ARARs Compliance with ARARs or Justification of a Waiver Cost-Effectiveness Utilization of Permanent Solutions and Treatment or Recovery to the Maximum Extent Practicable ("MEP") Preference for Treatment as a Principal Element (As a Consideration in Balancing the Nine Criteria) Implementability Statutory Findings Long-Term Effectiveness and Permanence Toxicity, Mobility, or Volume Reduction Through Treatment Short-Term Effectiveness Cost State Agency Acceptance Community Acceptance Process of evaluating alternatives Source: U.S. EPA, 1988. Guidance for conducting remedial investigations and feasibility studies under CERCLA (OSWER Directive 9355.3-01). Report Number EPA/540/G-89/004. U.S. Environmental Protection Agency, Washington, D.C. October 1988. The Concept of “Screening” • Uses indicators to identify candidates most likely to be found favorable • Proceeds from coarse screening analysis to more refined • Eventually, candidates from final screened list need detailed analysis Screening makes practical an otherwise enormous task of evaluating all candidates Example: Screening Criteria for Low- Level Radioactive Waste Disposal Site Exclusionary factors: Freestanding water Earthquake zones Federally-protected State-protected Landslide areas Subsidence areas Floodplain Favorability factors: Low permeability Simple geology No surficial sand & gravel Far from water supplies No high-yield aquifer No shallow aquifer Low erosion Example (continued) • Mapped areas with no aquifer within 50 feet of surface to evaluate “No shallow aquifer” • Final site not within shallow aquifer area • BUT…detailed site study discovered an unmapped shallow aquifer • Site still found favorable based on all factors Screening criteria are not final selection criteria! Broome County Landfill Site, New York Broome County Landfill Web site: http://www.gobroomecounty.com/dpw/DPWLandfill.php Timeline for Example Site: Broom County Landfill, Colesville, New York 1969-84 – Operated as MSW landfill 1973-75 – Drummed industrial waste accepted 1983 – Ground-water contamination discovered in private wells 1984 – Site nominated for NPL 1986 – Listed on NPL August 1986 – RI work plan by PRPs April 1988 – Draft RI report Timeline, continued...
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This note was uploaded on 12/06/2011 for the course ESD 1.34 taught by Professor Petershanahan during the Spring '04 term at MIT.

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lecture15 - Lecture 15 Remedy Selection and Risk Assessment...

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