Rationale for the Development and Application of Generic Soil, Groundwater and Sediment Criteria for Clean-up of Contaminated Sites -- Draft


Book Description

This document describes the rationale behind the development of generic soil, groundwater, and sediment quality criteria to be used in the clean-up of contaminated sites in Ontario. The document provides an overview of the environmental approach, components, and application of the revised OMEE contaminated sites clean-up criteria; describes in detail the process used in the development of the soil and groundwater clean-up criteria and the philosophical basis used in their development; and a series of summary tables that outline the specific rationales for each chemical parameter criterion.




Development and Implementation of Soil Quality and Cleanup Criteria for Contaminated Sites


Book Description

A critical but vexing problem with contaminated land has always been assessing the significance of contamination and the degree of cleanup required for contaminated soils and sediments. Various approaches have evolved to address this difficult issue and debate continues over which is the most appropriate. With the growing number of contaminated sites, the majority of which are non-catastrophic, interest in criteria-based approaches has grown. While there are difficulties associated with the development and implementation of generic criteria, they serve a definite purpose in an overall program for contaminated land management their usage is gaining favor in a growing number of jurisdictions around the world. 29 refs., 3 tabs.







Bioavailability of Contaminants in Soils and Sediments


Book Description

Bioavailability refers to the extent to which humans and ecological receptors are exposed to contaminants in soil or sediment. The concept of bioavailability has recently piqued the interest of the hazardous waste industry as an important consideration in deciding how much waste to clean up. The rationale is that if contaminants in soil and sediment are not bioavailable, then more contaminant mass can be left in place without creating additional risk. A new NRC report notes that the potential for the consideration of bioavailability to influence decision-making is greatest where certain chemical, environmental, and regulatory factors align. The current use of bioavailability in risk assessment and hazardous waste cleanup regulations is demystified, and acceptable tools and models for bioavailability assessment are discussed and ranked according to seven criteria. Finally, the intimate link between bioavailability and bioremediation is explored. The report concludes with suggestions for moving bioavailability forward in the regulatory arena for both soil and sediment cleanup.













Cleanup Criteria for Contaminated Soil and Groundwater


Book Description

Cleanup criteria for contaminated soil and groundwater have taken many different forms since the passage of the Resource Conservation and Recovery Act (RCRA) in 1976 and the Comprehensive Environmental Response, Compensation and Liability Act (CERCLA) in 1980, also referred to as the Superfund Act. These forms have included: (1) cleanup to background levels; (2) cleanup to levels established by the limits of detection; (3) cleanup to non-detect levels; (4) cleanup to levels established by the capability of the best demonstrated available remediation technologies; (5) cleanup to levels established by precedent, for example, Records of Decisions at Superfund Sites, decisions by regulatory authorities at similar sites, et cetera; (6) cleanup to existing standards or guidelines, for example, Maximum Contaminant Levels (MCLs) established in the Safe Drinking Water Act, Action Levels in the proposed RCRA Corrective Action Rule, et cetera; (7) cleanup to levels protective of potentially exposed individuals as established by a health risk assessment; and (8) combinations of the above.