THE CONCEPTUAL SITE MODEL A Visual Journey Though Data and Time October 29, 2013.
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THE CONCEPTUAL SITE MODEL A Visual Journey Though Data and Time October 29, 2013
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Transcript of THE CONCEPTUAL SITE MODEL A Visual Journey Though Data and Time October 29, 2013.
THE CONCEPTUAL SITE MODELA Visual Journey Though Data and Time
October 29, 2013
CONCEPTUAL SITE MODEL _
WHAT IS A CONCEPTUAL SITE MODEL ?
CONCEPTUAL SITE MODEL _
A Conceptual Site Model (CSM) describes site features and surface/subsurface conditions to understand contaminants
and the risk(s) they pose to receptors.
CONCEPTUAL SITE MODEL _
A CSM is included in the Part 213 definition of RBCA which directly references the ASTM:
Standard guide for development of conceptual site models and remediation strategies for light nonaqueous-phase liquids released to the subsurface, designation E 2531-06 E1, which references the
Standard guide for development of conceptual site models for Contaminated Sites, designation E 1689-95 (Reapproved 2008), which states (paraphrased):
A CSM is a written or pictorial representation of an environmental system and the processes that determine transport of contaminants from sources to receptors.
CONCEPTUAL SITE MODEL _
A CSM describes site conditions by:
- Identifying sources, pathways and receptors for contamination.
- Identifying critical biological, chemical or physical processes.
- Identifying the presence (and absence) of contamination.
CONCEPTUAL SITE MODEL _
The CSM is an EVOLVING document.
CONCEPTUAL SITE MODEL _
DEVELOPMENT OF A CONCEPTUAL SITE MODEL
CONCEPTUAL SITE MODEL _
1. Scope
2. Summary
3. Sources
4. Pathways and Receptors
5. Narrative and Visual Description
CONCEPTUAL SITE MODEL _
1. Scope of the Conceptual Site Model
- What Needs to be Characterized
- Extent of Area to be Investigated
- Human and/or Ecological Receptors
- Contaminants of Concern (COCs)
- Applicable Remedial Criteria
- Immediate/Long Term Environmental Concerns
CONCEPTUAL SITE MODEL _
2. Summarize Available Information
- Property Description
- Historical Information
- Off-site and Regional Information
- Geologic and Hydrogeological Information
- Other
CONCEPTUAL SITE MODEL _
3. Identify and Characterize Sources
- Operational and Ownership History
- Current and Historic Releases
- Location and Content of Releases
- Extent/Volume/Mass
- Prior Remedial Actions
CONCEPTUAL SITE MODEL _
4. Identify Pathways and Receptors
- Exposure Pathways• Current • Potential Future Use
- Human and/or Ecological Receptors
CONCEPTUAL SITE MODEL _
4. Identify Pathways and Receptors
CONCEPTUAL SITE MODEL _
5. A Narrative and Visual Description
- Puts all the pieces together in a summary fashion for the site as it is understood at that time.
- The CSM should describe the site, contaminants, pathways, and receptors. More complex sites should include a discussion of data gaps or uncertainties.
Note: this is probably the most critical part of a CSM. You need to be able to provide a clear description of your model and graphics with an explanation are a great way to do this.
CONCEPTUAL SITE MODEL _
LET THE FUN BEGIN…
CONCEPTUAL SITE MODEL _
CONCEPTUAL SITE MODEL _
CONCEPTUAL SITE MODEL _
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CONCEPTUAL SITE MODEL _
The Narrative:
A release of NAPL occurred from a dispenser. That NAPL migrated into the subsurface and migrated along a clay layer at 10 feet and then entered an aquifer 30 feet west of the source. The NAPL then pancaked in a classical fashion and created a groundwater plume that is migrating to the NE. That plume included BTEX at levels representative of a NAPL source and has migrated 260 feet down-gradient.
The source area presents a VI risk but soil vapor data indicate that the risk is contained and has not reached any structures. Down-gradient drinking wells are in the path of migration of the dissolved phase…
CONCEPTUAL SITE MODEL _
Contact InformationJoseph DeGrazia, C.P.G.
Senior GeologistMichigan Department on Environmental Quality
Remediation and Redevelopment DivisionSoutheast Michigan District Office
(586) [email protected]
