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

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

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

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

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

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

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.

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

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

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

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

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

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