Geophysical System Verification - A Commercial Application

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Presented at the UXO/Countermine/Range Forum 2009

Presented at the UXO/Countermine/Range Forum 2009

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  • 1. Commercial Application of the Physics-Based Test Strip and Seeding Approach
    Ryan Steigerwalt, P.G., Weston Solutions, Inc.
    Jim Austreng, P.E., California Department of Toxic Substances Control
    C. Scott Goulart, Aerojet-General Corporation
    UXO/Countermine/Range Forum 2009
    Orlando, Florida
  • 2. TALKING POINTS
    Introduction and Conceptual Site Model
    Project planning and requirements
    Implementation of the Geophysical System Verification (GSV) process
    Planning and development
    Test Strip construction
    Seeding program
    Operations
    Results
  • 3. INTRODUCTION
    Project site located in Chino Hills, CA
    Facility owned by Aerojet-General Corporation
    Perform MEC detection and removal in areas not previously investigated
    Use DGM in all accessible areas
    Perform mag & dig surveys in all other areas where possible
    Work was conducted with DTSC oversight
    Dec 2008 – Feb 2009
  • 4. CONCEPTUAL SITE MODEL
    CSM identified anticipated munitions and facility uses
    Extensive geophysical prove-outs were conducted at the facility in 2004
    Evaluated detection capabilities of various instruments and techniques
    Reported the type and quality of data required for subsequent MEC detection and removal activities
  • 5. WORK PLAN
    Use results from previous GPO
    Develop data collection parameters and quality control
    Perform a limited GPO and gain concurrence
    Mobilize remainder of crew
    Collect data
  • 6. PROJECT REQUIREMENTS
    In November 2008, wildfire struck the facility and cleared vegetation
    Need to perform technically defensible work, quickly, before vegetation returned
    Mobilize ASAP
  • 7. FIELD VARIANCE
    Began site setup
    Preparing to perform limited GPO
    Project team discussed GSV and potential application
    No GPO grid construction
    Start collecting data immediately
    No required review cycle
    Joint QC/QA
    Can continuously monitor performance
    Developed a brief field variance to document GSV approach- test strip construction and seeding
    Gained regulatory concurrence
  • 8. GSV DESIGN
    Test Strip Construction
    Seed anticipated munitions items at detection depth objectives
    Place seeds at least favorable orientation
    Establish multiple Test Strips if necessary to increase efficiency
    Perform daily to evaluate equipment functionality
  • 9. GSV DESIGN
    Seeding Program
    Use similar items and burial depths as Test Strips
    Initially place one seed within each 100-ft x 100-ft grid block
    Relax seed frequency to one seed per acre if performance is acceptable
  • 10. GSV IMPLEMENTATION
    Equipment
    EM61-MK2 towed sled
    4 sensor
    RTK-GPS Navigation
    Test Strip
    Perform background and baseline survey prior to production mapping
    Run Test Strip daily with instrumentation
    Perform concurrent with standardized QC function tests
    Evaluate response and monitor results
  • 11. SURVEY SUMMARY
    Digital Geophysical Mapping Summary
    Completed approximately 9 total acres
    Includes rough and steep terrain
    Spanned several weeks
    All DGM was performed using a towed array sled
  • 12. TEST STRIP 1 RESULTS
    Day 1 (Baseline)
    Day 2
    Day 3
    Day 4
    Day 5
    Day 6
  • 13. TEST STRIP 2 RESULTS
    Day 8
    Day 9
    Day 10
    Day 11
  • 14. TEST STRIP SUMMARY
    Direction of Travel
  • 15. SEEDING RESULTS
    19 total seeds (30mm, 25mm, 20mm)
    Check response against Test Strip results
    Test Strip Avg ~8 mV
    Response (mV)
    Test Strip Avg ~6 mV
    Test Strip Avg ~12 mV
    Seed
    +
    x
    Target
    Response (mV)
    Response (mV)
  • 16. QUALITY ASSURANCE
    Regulatory site visits
    Industry Standard Targets and inert items
    1-inch by 4-inch pipe nipples
    Vertical (most favorable) at 11-inches
    Horizontal (least favorable) at 7-inches
  • 17. SENSOR RESPONSE CURVE
  • 18. BENEFITS
    Means to monitor geophysical system performance daily and consistently
    Shortened schedule
    Re-allocated resources to risk reduction efforts
    Planning variance drafted onsite
    No duplicate QC/QA
    Began production mapping next day
  • 19. LESSONS LEARNED
    Still need to plan ahead
    Define objectives
    Seeding program
    Schedule
    Ensure Test Strip seeds are isolated from other influence
    Use Industry Standard Targets to reduce variability
    Reality works
  • 20. QUESTIONS?
    Montauk Monster