esm223_06__Lecture_Notes_fullsize

esm223_06__Lecture_Notes_fullsize - Spring 2007, Norm Brown...

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1 Lecture 6 – Site Investigations: Characterization Technologies Spring 2007, Norm Brown
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2 PS 2 ± Check also for “PS” 2 – a review worksheet
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3 Midterm ± in class, Thursday, February 7
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4 Site Characterization Technologies ± Geophysical ± Chemical/Biological ± Radionuclide ± Sampling and Sampler Emplacement The typical list of techno stuff:
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5 Site Characterization (Technologies) ± For example, What you learned from Ph I ESA (e.g., topographic relief, climate, site history etc…) ± Hydrology ± Soil Characteristics ± Geology ± Revisiting a conceptual model for contaminants and distribution ± How are you going to use the data? ± What is required by the regulatory body? Site Characterization is part of a continuum, so it relies on basic information already developed … … and it asks, for example, … … it mandates some additional basics …
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6 Hydrologic Characterization ± Groundwater levels ± Groundwater chemistry ² General mineral/physical ² Organics ² Contaminant ± Groundwater age dating ± With Geology: Confinement and related hydrogeological characteristics ± What are you trying to estimate? What can actually be measured?
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7 Geophysical, Methods ± Seismic Refration/Reflection ± Ground Penetrating Radar ± Electromagnetic induction/resistivity ± Magnetometry ± Gravity ± “Hybrid”: ± Bore-hole geophysical; EC etc ± Direct-push techniques Field Sampling and Analysis Guide (Reading - FRTR)
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8 Visualization •Data Display •Modeled Results •Degree of Interpretation & Uncertainty
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9 Dual Purpose – Characterization & RA Monitoring TM-9 -165 -145 -125 -105 -85 -65 -45 -25 -5 0 40 80 120 160 200 240 280 Temperature (F) Depth (ft)
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10 Ground Penetrating Radar ± High frequency pulsed electromagnetic waves to acquire subsurface information ± 10 MHz to 1,000 MHz ± Electromagnetic wave radiated from a transmitting antenna ± Travels through material at velocity determined primarily by electrical properties of the material
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11 Ground Penetrating Radar ± Wave spreads out and travels downward ± Wave bounces off a buried object or boundary ± different electrical properties ± part of wave energy is reflected or scattered back to surface ± Reflected wave is captured by a receiving antenna ± Record signal on a digital storage device for later interpretation.
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esm223_06__Lecture_Notes_fullsize - Spring 2007, Norm Brown...

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