ogden modeling presentationjbcc-iagwsp.org/groundwater/papers/9 18 00 modeling... · n incorporated...
TRANSCRIPT
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Camp Edwards Camp Edwards
Modeling PresentationModeling Presentation
Presented to NGB, AEC, USEPA, MADEP, USGS, AFCEE, and Jacobs Eng.on 9/18/2000 (Contact Ben Gregson, 508-968-5621).
Jay Clausen
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Today’s PresentationToday’s Presentation
n Introductionn Backgroundn Current Flow Modeling Activitiesn Planned Modeling Activities
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Massachusetts
Massachusetts Military Reservation
Site LocationSite Location Site LocationSite Location
Impact Area
Massachusetts Military Reservation
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Today’s PresentationToday’s Presentation
n Introductionn Background
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Phase I Soil ResultsPhase I Soil ResultsHydrogeologic Conceptual ModelHydrogeologic Conceptual Model
n Hydrogeologic model consists of 3 layers; unsaturated, saturated, and bedrock.
n Groundwater flow is radial with the center to the southeast of the Impact Area in the J Range Area.
n Depth to groundwater is ~ 100 ft and depth to bedrock is 300-350 ft.
n Geology consist of upward coarsening sequence.
n Aquifer is unconfined and aerobic.
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Hydrogeologic ModelHydrogeologic Model
Groundwater flow is radial with the mound to the southeast of the Impact Area in the J Range Area
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Camp Edwards LithologyCamp Edwards Lithology
ELE
VA
TIO
N I
N F
EE
T (
MS
L)
-100
-50
0
50
100
150
200
Sea Level
LegendVC Sand & GravelF Sand & Silt
Till
Bedrock
Water Table
Well Screen
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Today’s PresentationToday’s Presentation
n Introductionn Backgroundn Current Flow Modeling Activities
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USGS Flow Model SupportUSGS Flow Model Support
n Development of ZOCsn Placement of monitoring wellsn Determination of screen depthsn Identification of potential source areas
for soil samplingn Estimation of migration rates
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Today’s PresentationToday’s Presentation
n Introductionn Backgroundn Current Flow Modeling Activitiesn Planned Modeling Activities
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Phase II Soil ResultsPhase II Soil ResultsProposed FateProposed Fate--andand--Transport StudiesTransport Studies
n Laboratory experiments to define site-specific fate-and-transport parameters
n Fate-and-Transport Modeling
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Planned Site Specific Laboratory ExperimentsPlanned Site Specific Laboratory Experiments
n Batch experiments to evaluate sorption, desorption, and biodegradation.
n Column experiments to derive MMR specific partition coefficient (RDX, HMX, TNT, DNT).
n Determination of MMR specific soil properties (density, porosity, pH, fraction of organic carbon, CEC, and grain size distribution).
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FateFate--andand--Transport Modeling ObjectivesTransport Modeling Objectives
n Predict fate, path, rate, concentrationsn Determine soil screening levels protective
of groundwatern Source identificationn Input for risk models and risk
management decisions
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Modeling ApproachModeling Approach
n Determination of objectives 4n Conceptual model development 4n Model selection 4n Setup and input parameter estimationn Calibrationn Sensitivity analysisn Reconfiguration and calibrationn Scenario simulation modelingn Post simulation analysis
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Phase I Groundwater ResultsPhase I Groundwater ResultsModel RecommendationsModel Recommendations
n SESOIL (Simplified)
n MODFLOW/MT3D (Complex)
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Seasonal Soil Compartment Model (SESOIL)Seasonal Soil Compartment Model (SESOIL)
n Developed for EPA in 1981 by ADLn Modified extensively in 1986, 1988, and
1989 by ORNL n Incorporated by EPA into GEMS, 1989n GEMS commercialized by GSC and
incorporated into Windows platform in 1990 and updated in 1992 and 1995
n SESOIL also incorporated into applications for API, G&M, and CA-EPAs LUFT Manual
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SESOIL DetailsSESOIL Details
n The soil compartment is 3-dn The hydrologic cycle is 1-d (vertical
movement only)n Model accepts time-varying pollutant
loadingn Extensive comparison with other
models, sensitivity analysis, validation, and verification
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SESOIL ApplicationSESOIL Application
n Adopted by HI, MA, MI, NH, NM, and WI for developing soil cleanup standards
n EPAs Office Toxic Substances analyzed and prioritized chemical exposures
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Key SESOIL ParametersKey SESOIL Parameters
n Soil propertiesn Chemical propertiesn Climatic propertiesn Application propertiesn Sublayer soil propertiesn Mixing zone properties
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Soil PropertiesSoil Properties
n Soil databasen Bulk density 4n Intrinsic permeabilityn Disconnectedness Indexn Effective porosity 4n Organic carbon content 4n Cation Exchange Capacityn Freundlich Exponent
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Chemical PropertiesChemical Properties
n Solubility 4n Air diffusion coefficient 4n Henry’s Law 4n Adsorption coefficient (Koc) 4n Soil partitioning coefficient (Kd) 4n Molecular weight 4n Hydrolysis rate *
n Biodegradation rate *
n Complexation rate *
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Climatic PropertiesClimatic Properties
n Climatic databasen Air temperaturen Cloud covern Humidityn Albedon Evapotranspirationn Precipitationn Durationn Number of storms
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Application PropertiesApplication Properties
n Number of years of simulationn Number of soil layersn Application arean Instantaneous or Continuos loadingn Initial soil concentration
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SublayerSublayer Soil PropertiesSoil Properties
n Thicknessn Number of sublayersn Intrinsic permeabilityn Organic carbon contentn Cation Exchange Capacityn Biodegradation raten Adsorption raten Volatilization raten Runoff
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Mixing Zone PropertiesMixing Zone Properties
n Hydraulic conductivityn Horizontal hydraulic gradientn Thickness of mixing zonen Width of contaminated zonen Background concentration