SciTech Connect

Title: THE SCENARIOS APPROACH TO ATTENUATION-BASED REMEDIES FOR INORGANIC AND RADIONUCLIDE CONTAMINANTS

THE SCENARIOS APPROACH TO ATTENUATION-BASED REMEDIES FOR INORGANIC AND RADIONUCLIDE CONTAMINANTS Guidance materials based on use of conceptual model scenarios were developed to assist evaluation and implementation of attenuation-based remedies for groundwater and vadose zones contaminated with inorganic and radionuclide contaminants. The Scenarios approach is intended to complement the comprehensive information provided in the US EPA's Technical Protocol for Monitored Natural Attenuation (MNA) of Inorganic Contaminants by providing additional information on site conceptual models and extending the evaluation to consideration of Enhanced Attenuation approaches. The conceptual models incorporate the notion of reactive facies, defined as units with hydrogeochemical properties that are different from surrounding units and that react with contaminants in distinct ways. The conceptual models also incorporate consideration of biogeochemical gradients, defined as boundaries between different geochemical conditions that have been induced by waste disposal or other natural phenomena. Gradients can change over time when geochemical conditions from one area migrate into another, potentially affecting contaminant mobility. A recognition of gradients allows the attenuation-affecting conditions of a site to be projected into the future. The Scenarios approach provides a stepwise process to identify an appropriate category of conceptual model and refine it for a specific site. Scenario materials provide links to pertinent sections in the EPA technical protocol and present more » information about contaminant mobility and important controlling mechanism for attenuation-based remedies based on the categories of conceptual models. « less
Authors: ; ; ; ; ;
Publication Date:
OSTI Identifier:1023615
Report Number(s):SRNL-STI-2011-00459
TRN: US201119%%145
DOE Contract Number:DE-AC09-08SR22470
Resource Type:Technical Report
Research Org:SRS
Sponsoring Org:DOE
Country of Publication:United States
Language:English
Subject: 54 ENVIRONMENTAL SCIENCES; ATTENUATION; EVALUATION; IMPLEMENTATION; NATURAL ATTENUATION; RADIOISOTOPES; SIMULATION; US EPA; WASTE DISPOSAL