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GEOPHYSICAL SERVICES

GEOPHYSICAL SERVICES

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GEOPHYSICAL SERVICES

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  1. SOUTHWESTGEOPHYSICS GEOPHYSICALSERVICES PresentedBy: Hans van de Vrugt, CEG, RGp Patrick F. Lehrmann, PG, RGp

  2. Site Evaluation Direct Methods • Boreholes/Probes • Test Pits/Trenches • Cores

  3. Geophysical Techniques Indirect Methods • Ground Penetrating Radar (GPR) • Electromagnetics (EM) • Magnetics • Utility Locating • Seismics • Electrical Resistivity • Gravity • Very Low Frequency (VLF)

  4. Advantages: Geophysical Techniques Indirect Methods • Non-Destructive • Cost Effective • Provides Preliminary or Supplemental Information

  5. Geotechnical Applications

  6. Environmental Applications

  7. Ground Penetrating Radar System Geophysical Methods SIR 3000 – 400 MHz SIR 3000 – 100 MHz

  8. Ground Penetrating RADAR (GPR) Survey

  9. Stratigraphy Survey GPR Data

  10. Common GPR Antennas 1500 MHz .5 m Structure Evaluation 900 MHz 1 m Structure Evaluation, Void Detection 400 MHz 4 m Engineering, Environmental, Void Detection 200 MHz 7 m Geotechnical, Engineering, Environmental 100 MHz 20 m Geotechnical, Environmental, Mining

  11. Geophysical Methods Electromagnetic Conductivity: EM-61 and EM-31 Field Survey Equipment EM-31 EM-61

  12. Electromagnetic Conductivity Survey GROUND SURFACE PRIMARY FIELD GROUND SURFACE INDUCED CURRENT IN SUBSURFACE OBJECT SECONDARY FIELD

  13. UST Search Electromagnetic (EM61) Survey Data

  14. Geophysical Methods Magnetics - Magnetometer Equipment Gradiometer Magnetometer

  15. Magnetics Survey

  16. Magnetometer Survey Data 10,000 Gallon UST

  17. Magnetometer Survey Data Abandoned Oil Well

  18. Magnetometer Survey Data Lost Culvert

  19. Geophysical Methods Seismic Refraction System

  20. Seismic Refraction Survey

  21. Seismic Refraction Survey Data

  22. Depth To Bedrock Study Seismic Refraction Velocity Model

  23. GeophysicalMethods Sting/Swift Earth Resistivity System

  24. Resistivity: Wenner Array Survey

  25. Sting Dipole-Dipole Array

  26. Landfill Investigation Earth Resistivity Profiling

  27. Case Studies

  28. Former Landfill, Proving Grounds

  29. Former Landfill, Proving Grounds

  30. Former Landfill, Proving Grounds

  31. Undocumented Landfill Survey

  32. Undocumented Landfill SurveyData Points

  33. Undocumented Landfill Survey

  34. Undocumented Landfill Survey

  35. Magnetic SurveyUndocumented Landfill

  36. Magnetic Data Map

  37. Proposed Power Plant Site

  38. Terrain Conductivity (EM31) Survey

  39. Terrain Conductivity (EM31) Survey(EM Low)

  40. Sting Results

  41. Instrument List • Sir 3000 GPR W/ 400, 900 & 1600 MHz Antennas • Geonics EM61 Time Domain EM Metal Detector • Geonics EM31 Terrain Conductivity Meter • Geometrics 858 Cesium Magnetometer • Schonstedt GA 52 Magnetic Gradiometer • RD4000, RD500 & Metrotech 9860 Utility Line Locators • Fisher M-Scope TW-6 Pipe Locator • Fisher M-Scope M-100 Rebar and Cable Locator • Instantel Blastmate III Vibration Monitor • Geometrics StrataView 24 Channel Seismograph • AGI Super Sting R8 Resistivity Meter • Trimble Pro XRS GPS

  42. Advantages/Limitations Advantages • Non Destructive • Quick Data Collection • Cost Effective • Limitations • Depth of Penetration v. Resolution • Non Unique Solutions • Undesirable Signals/Noise

  43. Illegal Drum BurialEM61 Data

  44. Illegal Drum Burial GPR Data

  45. Illegal Drum Burial Pay Dirt

  46. Undocumented Landfill Survey

  47. Site Map

  48. Time-Distance Plot