Location

London

Event Website

http://www.csce2016.ca/

Description

In-situ site characterization can be a key component of site delineation and remediation. In-situ site characterization allows for large amounts of detailed data to be collected quickly and cost-effectively compared to traditional techniques. These data, combined with traditional Phase II Environmental Site Assessment (ESA) methods, greatly enhance the understanding of the presence, concentration and distribution of contaminants in the subsurface, which can lead to more efficient and focused monitoring and remediation programs.

Three high-resolution characterization technologies have recently been introduced to Canada. These include the Membrane Interface Probe (MIP) for dissolved-phase contamination, the Laser-Induced Fluorescence (LIF) probe for free-phase petroleum hydrocarbon (PHC) contamination, and the Hydraulic Profiling Tool (HPT) for measuring the subsurface permeability and ultimately estimating the hydraulic conductivity of the subsurface. All three probes are advanced to depth by direct push methods (Geoprobe System™). The LIF probe consists of a fiber optic cable that emits an ultraviolet light through a window during probe advancement. The PAHs in PHCs fluoresce and the response is measured by instrumentation at the surface in real-time. The MIP is a heated probe that is used to volatilize dissolved and sorbed contaminants. The contaminants diffuse through a semi-permeable membrane on the probe and are subsequently transported to the surface for analysis. The HPT probe injects a constant flow of clean water from surface and utilizes a downhole pressure transducer to measure subsurface permeability above and below the water table. Hydraulic conductivity can be estimated in the saturated zone at the conclusion of each push.


Share

COinS
 
Jun 1st, 12:00 AM Jun 4th, 12:00 AM

ENV-638: ADVANCED TECHNIQUES FOR SITE CHARACTERIZATION: REAL-TIME HIGH-RESOLUTION SITE CHARACTERIZATION OF THE SUBSURFACE USING MIP, LIF AND HPT

London

In-situ site characterization can be a key component of site delineation and remediation. In-situ site characterization allows for large amounts of detailed data to be collected quickly and cost-effectively compared to traditional techniques. These data, combined with traditional Phase II Environmental Site Assessment (ESA) methods, greatly enhance the understanding of the presence, concentration and distribution of contaminants in the subsurface, which can lead to more efficient and focused monitoring and remediation programs.

Three high-resolution characterization technologies have recently been introduced to Canada. These include the Membrane Interface Probe (MIP) for dissolved-phase contamination, the Laser-Induced Fluorescence (LIF) probe for free-phase petroleum hydrocarbon (PHC) contamination, and the Hydraulic Profiling Tool (HPT) for measuring the subsurface permeability and ultimately estimating the hydraulic conductivity of the subsurface. All three probes are advanced to depth by direct push methods (Geoprobe System™). The LIF probe consists of a fiber optic cable that emits an ultraviolet light through a window during probe advancement. The PAHs in PHCs fluoresce and the response is measured by instrumentation at the surface in real-time. The MIP is a heated probe that is used to volatilize dissolved and sorbed contaminants. The contaminants diffuse through a semi-permeable membrane on the probe and are subsequently transported to the surface for analysis. The HPT probe injects a constant flow of clean water from surface and utilizes a downhole pressure transducer to measure subsurface permeability above and below the water table. Hydraulic conductivity can be estimated in the saturated zone at the conclusion of each push.

http://ir.lib.uwo.ca/csce2016/London/Environmental/19