RITS Fall 2009 Getting the Most Out of Your Conceptual Site Model 1
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1 of Your Conceptual Site Model 1
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6 The CSM is a comprehensive representation of the site that documents current site conditions. It characterizes the distribution of contaminant concentrations across the site in three dimensions and identifies all potential exposure pathways, migration routes, and potential receptors. USEPA, SUPPLEMENTAL GUIDANCE FOR DEVELOPING SOIL SCREENING LEVELS FOR SUPERFUND SITES, OSWER , December 2002 The CSM summarizes the site conditions, the distribution of constituents of potential concern (COPCs), potential receptors and exposure pathways, and land use data available for a given site. Guidance For Optimizing Remedy Evaluation, Selection and Design; User s Guide UG ENV, April 2004, prepared for NAVFAC. Others: The CSM is a description of a site and its environment that is based on existing knowledge. It describes sources and receptors, and the interactions that link these. It assists the team in planning, data, interpretation and communication (CONCEPTUAL SITE MODELS FOR ORDNANCE AND EXPLOSIVES (OE) AND HAZARDOUS, TOXIC, AND RADIOACTIVE WASTE (HTRW) PROJECTS, EM February U.S. Army Corps of Engineers) A representation of site conditions developed using readily available (existing) data that illustrates the relationship between contaminants, retention/transport media, and receptors. EPA. November Using the Conceptual Site Model to Select Performance Standards and Develop Data Quality Objectives in the CAS. A CSM is a three-dimensional picture of site conditions at a discrete point in time (a snapshot) that conveys what is known or suspected about the facility, releases, release mechanisms, contaminant fate and transport, exposure pathways, potential receptors, and risks. EPA Region 6, Corrective Action Strategy (CAS), November 2008 RITS Fall 2009 Getting the Most Out of Your Conceptual Site Model 6
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8 Because site conditions can change between the FS and RD phases, RPMs should consider the development of the CSM to be a continuous evolving process until site closeout is achieved. RITS Fall 2009 Getting the Most Out of Your Conceptual Site Model 8
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17 constituents of potential concern (COPC) RITS Fall 2009 Getting the Most Out of Your Conceptual Site Model 17
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21 Don t need all of these or maybe just a combination RITS Fall 2009 Getting the Most Out of Your Conceptual Site Model 21
22 Pic: Exhibit 2, EPA, Soil Screening Guidance, 1996 RITS Fall 2009 Getting the Most Out of Your Conceptual Site Model 22
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25 Flow diagrams are typically made for risk assessments RITS Fall 2009 Getting the Most Out of Your Conceptual Site Model 25
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38 Navy Graphic from NIRIS RITS Fall 2009 Getting the Most Out of Your Conceptual Site Model 38
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40 It should be noted (or verbally explained) that some of these are easier than others - e.g., Time series is easy; contractor support would probably be needed to do 3D. RITS Fall 2009 Getting the Most Out of Your Conceptual Site Model 40
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44 NewFields graphics RITS Fall 2009 Getting the Most Out of Your Conceptual Site Model 44
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54 NAS Jax Graphics from NIRIS and generated 4Dim model Time Series Analysis of COCs demonstrate Most wells exhibit stable or decreasing trends in parent compounds (i.e. PCE and TCE) Evidence for enhanced and natural reductive dechlorination CPT data indicate clay layer thickness ranges from <1 to 10 feet MIP/DPT data indicate CVOCs migrated through or around clay layer at Bldg 106 Area with PCE ~1000s ppb at ft bgs along upgradient edge of former Bldg. 106 Much of the saturated zone contaminant mass resides in low permeability layers per CPT data Back diffusion will limit impact of source treatment on downgradient plume and remediation timeframes. MNA and Long-term monitoring Attenuation along GW flow path and occurring at groundwater/surface water interface (shown to be effective OU3) Transition zone (i.e., GW/SW interface) Key element in site characterization Need cross-media data (GW, SW, sediment) to verify model results RITS Fall 2009 Getting the Most Out of Your Conceptual Site Model 54
55 NAS Jax Graphics - generated 4Dim model screen capture Time Series Analysis of COCs demonstrate Most wells exhibit stable or decreasing trends in parent compounds (i.e. PCE and TCE) Evidence for enhanced and natural reductive dechlorination CPT data indicate clay layer thickness ranges from <1 to 10 feet MIP/DPT data indicate CVOCs migrated through or around clay layer at Bldg 106 Area with PCE ~1000s ppb at ft bgs along upgradient edge of former Bldg. 106 Much of the saturated zone contaminant mass resides in low permeability layers per CPT data Back diffusion will limit impact of source treatment on downgradient plume and remediation timeframes. MNA and Long-term monitoring Attenuation along GW flow path and occurring at groundwater/surface water interface (shown to be effective OU3) Transition zone (i.e., GW/SW interface) Key element in site characterization Need cross-media data (GW, SW, sediment) to verify model results RITS Fall 2009 Getting the Most Out of Your Conceptual Site Model 55
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65 Navy policies dictate the creation and use of CSM RITS Fall 2009 Getting the Most Out of Your Conceptual Site Model 65
66 Navy policies dictate the creation and use of CSM RITS Fall 2009 Getting the Most Out of Your Conceptual Site Model 66
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