Shawnee A



B.L. Hall, C.K. Baldwin, and R.R. Dupont, Utah Water Research Lab, Utah State University, Logan UT 84322-8200 The advent of the use of air injection remediation technologies such as in situ air sparging (IAS) and in-well aeration (IWA) has highlighted a need for improved in situ monitoring techniques. With this need in mind, combination sample collection system and instrumentation bundles were developed for in situ monitoring of subsurface conditions during air injection.

The saturated zone bundles provide information on ground water temperature and displacement and concentration of dissolved oxygen for use in defining the volume of influence of air injection systems. The vadose zone bundles provide information on soil gas oxygen concentration. Both bundles also provide access to discrete sampling locations for the collection of grab samples during system evaluation.

Field data were gathered at a site with a subsurface characterized by heterogenous sand, silt, and clay. Thirty-four of the sensor bundles were located around the point of injection to provide a comparison of the development of air flow pathways among nine short duration field IAS trials. The sample collection and instrumentation bundle system have been used to monitor injection phases of 30 minutes followed by 7-day recovery phases.

The data collection system has indicated that air channels develop from the injection point to the monitoring points in as short as one minute but do not develop in the same order for each trial. Temporary mounding of the ground water, characterized by changes in hydrostatic head, is measurable in each case.

Key words: air sparging, monitoring, dissolved oxygen

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Tuesday, May 20, 1997

Metals Kansa A

Remediation of Munitions Compounds Kansa B

Analytical Methods Kansa C/D

General Topics Kansa B

Wednesday, May 21, 1997

Metals Kansa A

Zero-Valent Metals Kansa A

Remediation Kansa A

Vegetation-based Remediation Kansa B

Partnerships & Innovative Technologies Kansa C/D

Nonaqueous Phase Liquids Kansa C/D

Thursday, May 22, 1997

Biofilms & Barriers Kansa A

Bioremediation Kansa B

Partnerships & Technology Innovations Kansa C/D

Remediation Kansa C/D


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