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Presented By: Shawn Leppert Leppert Associates, Inc.

Hydraulic Property Distribution Estimation through Groundwater Modeling of the Observed Effects from “Uncontrolled” Resident Hydraulic Stress. Presented By: Shawn Leppert Leppert Associates, Inc. MODFLOW and More 2006 Conference May, 24 th 2006.

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Presented By: Shawn Leppert Leppert Associates, Inc.

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  1. Hydraulic Property Distribution Estimation through Groundwater Modeling of the Observed Effects from “Uncontrolled” Resident Hydraulic Stress Presented By: Shawn Leppert Leppert Associates, Inc. MODFLOW and More 2006 Conference May, 24th 2006

  2. Three Examples of Resident Stress Inadvertent River Flood Event • Unanticipated • Large Scale Tidal Influence on Hydraulic Containment • Inadvertant River Flood Event • Unanticipated Groundwater Supply Stress for Model Calibration • Anthropogenic • Resident and Uncontrolled

  3. River Flood: Data • Small Hazardous Waste Handling Facility • Rural Midwest • Designed an Intricate Hydraulic Stress Test (72 hour) • Construct Extraction Well for the Stress • Refurbish Other Extraction Wells and Equip with Flow Meters • Fit 14 Monitoring Wells with Data Transducers • 4 River Stages Placed

  4. River Flood: Stress • Began Test June 3, 2003 • Two Days of Baseline Monitoring • Initiated Test • Major Rain Event on Fifth Day • Two River Gauges Swept Away • Diligently Continued Compiling Data

  5. River Flood: Benefits • River Stress was Large Scaled • Effects Felt for a Couple of Weeks • Hard Work Calibrating Model to Stress • Allowed for a very good Permeability Mapping • Very Good Agreement for Mass Depletion Contaminant transport

  6. River Flood: Benefits • River Stress was Large Scaled • Effects Felt for a Couple of Weeks • Hard Work Calibrating Model to Stress • Allowed for a very good Permeability Mapping • Very Good Agreement for Mass Depletion Contaminant transport

  7. Tidal Influence: Data • Closed Hazardous waste Incinerator • Urban East-Coast • Monitored Tidal Influences and Existing Extraction • Down-Loaded NOAA tide Tables • Fit 12 Monitoring Wells with Data Transducers • Monitored at 2.0 minute intervals for 30 days.

  8. Tidal Influence: Stress • Measured Influence in Monitoring Wells Screened in Three Units • Solar & Lunar Tides • Barometric Pressure • Statistically Compare Influence Measured at Creek to Tide Charts • Develop a Statistical Relation Ship • Model Stress Defined By Measured Step Function

  9. Tidal Influence: Benefit • Use the Quick Response to Tidal Influences for Calibration Verification • Observed All Three Influences in Monitoring Well Even Below Hydraulic Connection • Minor Effect on Capture Zones

  10. Supply Stress: Data • Waste Lagoons • Southern Rural Quebec • 15 Years of Remediation Continuing 15 Years • Designed a Two Week Hydraulic Stress Test • Built 5 Monitoring Wells • Transducers in 22 Monitoring Wells • Take Control of the Existing Water Supply Well for the Stress • Implement a Constant Pumping Rate • Verification Packer Testing

  11. Supply Stress: Stress • Extraction Well Effectively Uncontrollable • Maximize Extraction by Discrete Pumping • Measure Many Stresses in Monitoring Data • Stress Well • Stress Well Malfunction • Two Significant Rain Events • Nearby Remediation Extraction

  12. Supply Stress: Benefit • Excellent Transient Calibration Data • Defines Response of Aquifer to Temporal Stress • Shows Effective Permeability Approach is Appropriate • Much More Data Analysis to Come

  13. Conclusions Take a Close Look at Natural Stresses to Use for Model Calibration “Resident” Stress such as Groundwater Supply Extraction is Another Stress Alternative

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