Geophysical System Verification - A Commercial Application

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Presented at the UXO/Countermine/Range Forum 2009

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Geophysical System Verification - A Commercial Application

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

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