Title page for ETD etd-01172009-063603

Type of Document Master's Thesis
Author Haney, Orrick Rowland
URN etd-01172009-063603
Title Design, performance, and analysis of a multi-level air permeability test
Degree Master of Science
Department Civil Engineering
Advisory Committee
Advisor Name Title
Widdowson, Mark A. Committee Chair
Diplas, Panayiotis Committee Member
Filz, George G. Committee Member
  • Soil permeability
Date of Defense 1994-02-05
Availability restricted
The design, performance, and analysis of a soil vapor extraction system to identify zones most conductive to air transport and quantify kair in sequential soil layers is presented. A multi-level extraction well, with alternating solid and screened sections, was utilized to characterize multi-layered media. The field site, located in the Carolina Slate Belt within the physiographic region known as the Piedmont, is comprised of alternating layers of different soil types of varying kair , including thin bands of clay, silt, and sand.

The pneumatic test consisted of one multi-level extraction well and four multi-level pressure monitoring wells. Screen locations were based on previous site characterization. Vapors were extracted at one screen while pressure, temperature, and volumetric flow rate were monitored using a computer data acquisition system. Data was analyzed by both steady-state and transient solution techniques using pressure drawdown versus time data collected at various locations.

Results from vapor extraction tests indicate that the multi-level approach is advantageous when dealing with heterogenous media, since the most permeable layer was identified. Transient and steady-state solutions indicate that a kair= 2.0 X 10-7 cm2 is representative of the located permeable layer within the subsurface. Vacuum system, formation, and extraction well characteristics are evaluated to determine pressure as a function of volumetric flow rate.

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