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SINGLE-INTERVAL GAS PERMEABILITY ESTIMATION
Citation:
DIGIULIO, D. C. SINGLE-INTERVAL GAS PERMEABILITY ESTIMATION. Presented at The 17th Annual Association for Environmental Health and Sciences Meeting, San Diego, CA, March 21 - 22, 2007.
Impact/Purpose:
To inform the public.
Description:
Single-interval, steady-steady-state gas permeability testing requires estimation of pressure at a screened interval which in turn requires measurement of friction factors as a function of mass flow rate. Friction factors can be obtained by injecting air through a length of pipe or tubing with the attached screen and fittings that will be used in the field. An analytical solution developed by Baehr and Joss (1995) for two-dimensional, axisymmetric gas flow in a homogeneous and anisotropic domain can then be used radial gas permeability estimation. An example of this procedure is provided for sub-slab probes at the Raymark Superfund site.