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Geophysical System Verification - A Commercial Application

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This document summarizes a project using physics-based test strips and seeding to perform detection and removal of munitions at a former military site in California. Key points: 1) Test strips with seeded munitions items were constructed daily to monitor detection capabilities of geophysical equipment over time. Seeds were also placed throughout the site. 2) Results showed equipment could reliably detect seeded items down to detection depth objectives. Daily testing allowed issues to be addressed quickly. 3) The approach allowed work to begin immediately after a wildfire without extensive pre-work, shortening the schedule. Resources could focus on risk reduction rather than duplicate quality control efforts.

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Commercial Application of the Physics-Based Test Strip and Seeding ApproachRyan Steigerwalt, P.G., Weston Solutions, Inc.Jim Austreng, P.E., California Department of Toxic Substances ControlC. Scott Goulart, Aerojet-General CorporationUXO/Countermine/Range Forum 2009Orlando, Florida
TALKING POINTSIntroduction and Conceptual Site Model Project planning and requirementsImplementation of the Geophysical System Verification (GSV) processPlanning and developmentTest Strip constructionSeeding programOperationsResults
INTRODUCTIONProject site located in Chino Hills, CAFacility owned by Aerojet-General CorporationPerform MEC detection and removal in areas not previously investigatedUse DGM in all accessible areasPerform mag & dig surveys in all other areas where possibleWork was conducted with DTSC oversightDec 2008 – Feb 2009
CONCEPTUAL SITE MODELCSM identified anticipated munitions and facility usesExtensive geophysical prove-outs were conducted at the facility in 2004Evaluated detection capabilities of various instruments and techniquesReported the type and quality of data required for subsequent MEC detection and removal activities
WORK PLANUse results from previous GPODevelop data collection parameters and quality controlPerform a limited GPO and gain concurrenceMobilize remainder of crewCollect data
PROJECT REQUIREMENTSIn November 2008, wildfire struck the facility and cleared vegetationNeed to perform technically defensible work, quickly, before vegetation returnedMobilize ASAP
FIELD VARIANCEBegan site setupPreparing to perform limited GPOProject team discussed GSV and potential applicationNo GPO grid constructionStart collecting data immediatelyNo required review cycleJoint QC/QACan continuously monitor performanceDeveloped a brief field variance to document GSV approach- test strip construction and seedingGained regulatory concurrence
GSV DESIGNTest Strip ConstructionSeed anticipated munitions items at detection depth objectivesPlace seeds at least favorable orientationEstablish multiple Test Strips if necessary to increase efficiencyPerform daily to evaluate equipment functionality
GSV DESIGNSeeding ProgramUse similar items and burial depths as Test StripsInitially place one seed within each 100-ft x 100-ft grid blockRelax seed frequency to one seed per acre if performance is acceptable
GSV IMPLEMENTATIONEquipmentEM61-MK2 towed sled4 sensorRTK-GPS NavigationTest StripPerform background and baseline survey prior to production mappingRun Test Strip daily with instrumentationPerform concurrent with standardized QC function testsEvaluate response and monitor results
SURVEY SUMMARYDigital Geophysical Mapping SummaryCompleted approximately 9 total acresIncludes rough and steep terrainSpanned several weeksAll DGM was performed using a towed array sled
TEST STRIP 1 RESULTSDay 1 (Baseline)Day 2Day 3Day 4Day 5Day 6
TEST STRIP 2 RESULTSDay 8Day 9Day 10Day 11
TEST STRIP SUMMARYDirection of Travel
SEEDING RESULTS19 total seeds (30mm, 25mm, 20mm)Check response against Test Strip resultsTest Strip Avg ~8 mVResponse (mV)Test Strip Avg ~6 mVTest Strip Avg ~12 mVSeed+xTargetResponse (mV)Response (mV)
QUALITY ASSURANCERegulatory site visitsIndustry Standard Targets and inert items1-inch by 4-inch pipe nipplesVertical (most favorable) at 11-inchesHorizontal (least favorable) at 7-inches
SENSOR RESPONSE CURVE
BENEFITSMeans to monitor geophysical system performance daily and consistentlyShortened scheduleRe-allocated resources to risk reduction effortsPlanning variance drafted onsiteNo duplicate QC/QABegan production mapping next day
LESSONS LEARNEDStill need to plan aheadDefine objectivesSeeding programScheduleEnsure Test Strip seeds are isolated from other influenceUse Industry Standard Targets to reduce variabilityReality works
QUESTIONS?Montauk Monster

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Geophysical System Verification - A Commercial Application

  • 1. Commercial Application of the Physics-Based Test Strip and Seeding ApproachRyan Steigerwalt, P.G., Weston Solutions, Inc.Jim Austreng, P.E., California Department of Toxic Substances ControlC. Scott Goulart, Aerojet-General CorporationUXO/Countermine/Range Forum 2009Orlando, Florida
  • 2. TALKING POINTSIntroduction and Conceptual Site Model Project planning and requirementsImplementation of the Geophysical System Verification (GSV) processPlanning and developmentTest Strip constructionSeeding programOperationsResults
  • 3. INTRODUCTIONProject site located in Chino Hills, CAFacility owned by Aerojet-General CorporationPerform MEC detection and removal in areas not previously investigatedUse DGM in all accessible areasPerform mag & dig surveys in all other areas where possibleWork was conducted with DTSC oversightDec 2008 – Feb 2009
  • 4. CONCEPTUAL SITE MODELCSM identified anticipated munitions and facility usesExtensive geophysical prove-outs were conducted at the facility in 2004Evaluated detection capabilities of various instruments and techniquesReported the type and quality of data required for subsequent MEC detection and removal activities
  • 5. WORK PLANUse results from previous GPODevelop data collection parameters and quality controlPerform a limited GPO and gain concurrenceMobilize remainder of crewCollect data
  • 6. PROJECT REQUIREMENTSIn November 2008, wildfire struck the facility and cleared vegetationNeed to perform technically defensible work, quickly, before vegetation returnedMobilize ASAP
  • 7. FIELD VARIANCEBegan site setupPreparing to perform limited GPOProject team discussed GSV and potential applicationNo GPO grid constructionStart collecting data immediatelyNo required review cycleJoint QC/QACan continuously monitor performanceDeveloped a brief field variance to document GSV approach- test strip construction and seedingGained regulatory concurrence
  • 8. GSV DESIGNTest Strip ConstructionSeed anticipated munitions items at detection depth objectivesPlace seeds at least favorable orientationEstablish multiple Test Strips if necessary to increase efficiencyPerform daily to evaluate equipment functionality
  • 9. GSV DESIGNSeeding ProgramUse similar items and burial depths as Test StripsInitially place one seed within each 100-ft x 100-ft grid blockRelax seed frequency to one seed per acre if performance is acceptable
  • 10. GSV IMPLEMENTATIONEquipmentEM61-MK2 towed sled4 sensorRTK-GPS NavigationTest StripPerform background and baseline survey prior to production mappingRun Test Strip daily with instrumentationPerform concurrent with standardized QC function testsEvaluate response and monitor results
  • 11. SURVEY SUMMARYDigital Geophysical Mapping SummaryCompleted approximately 9 total acresIncludes rough and steep terrainSpanned several weeksAll DGM was performed using a towed array sled
  • 12. TEST STRIP 1 RESULTSDay 1 (Baseline)Day 2Day 3Day 4Day 5Day 6
  • 13. TEST STRIP 2 RESULTSDay 8Day 9Day 10Day 11
  • 15. SEEDING RESULTS19 total seeds (30mm, 25mm, 20mm)Check response against Test Strip resultsTest Strip Avg ~8 mVResponse (mV)Test Strip Avg ~6 mVTest Strip Avg ~12 mVSeed+xTargetResponse (mV)Response (mV)
  • 16. QUALITY ASSURANCERegulatory site visitsIndustry Standard Targets and inert items1-inch by 4-inch pipe nipplesVertical (most favorable) at 11-inchesHorizontal (least favorable) at 7-inches
  • 18. BENEFITSMeans to monitor geophysical system performance daily and consistentlyShortened scheduleRe-allocated resources to risk reduction effortsPlanning variance drafted onsiteNo duplicate QC/QABegan production mapping next day
  • 19. LESSONS LEARNEDStill need to plan aheadDefine objectivesSeeding programScheduleEnsure Test Strip seeds are isolated from other influenceUse Industry Standard Targets to reduce variabilityReality works