Helium Tracer Tests for Assessing Contaminant Vapor Recovery and Air Distribution During In Situ Air Sparging

Johnson, Richard L.; Johnson, Paul C.; Johnson, Tim L.; Leeson, Andrea

doi:10.1080/20018891079357

Cited by 11 publications

(7 citation statements)

References 4 publications

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“…Johnson et al (2001b), this equation assumes that the air extraction rate exceeds the IAS air injection rate. Helium recovery data tends to fall into two ranges.…”

Section: Percent Helium Recoveredmentioning

confidence: 99%

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Diagnostic Tools for Integrated In Situ Air Sparging Pilot Tests

Johnson

Amerson

et al. 2001

Bioremediation Journal

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In situ air sparging (IAS) pilot test procedures have been developed that provide rapid, on-site information about IAS performance. The standard pilot test consists of six activities conducted to look for indicators of infeasibility and to characterize the air distribution to the extent necessary to make design decisions about IAS well placement. In addition, safety hazards that need to be addressed prior to full-scale design are identified. Two additional pilot test activities are described in those cases where air distribution must be more precisely defined. The test activities include both chemical tests (tracking contaminant concentrations, dissolved oxygen and tracers) and physical tests (air flow rate and injection pressure, groundwater pressure response).

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“…Johnson et al (2001b), this equation assumes that the air extraction rate exceeds the IAS air injection rate. Helium recovery data tends to fall into two ranges.…”

Section: Percent Helium Recoveredmentioning

confidence: 99%

“…Helium can be used in two primary ways as a tracer for IAS systems (Johnson et al, 1996;R.L. Johnson et al, 2001b).…”

Section: Helium Distribution and Recovery Test (Pt4)mentioning

confidence: 99%

Diagnostic Tools for Integrated In Situ Air Sparging Pilot Tests

Johnson

Amerson

et al. 2001

Bioremediation Journal

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“…The pressures remained elevated for nearly two days, until the sparging system was turned off. This is indicative of an extensive layer that is effective at preventing upward migration of the air and is consistent with the helium tracer data for the site (Johnson et al, 2000b). Vertical permeability was measured using intact soil cores from the site in a constant-head permeameter.…”

Section: Example 4: Hill Afb Utmentioning

confidence: 67%

Diagnosis of in Situ Air Sparging Performance Using Groundwater Pressure Changes During Startup and Shutdown

Johnson¹,

Johnson²,

Johnson³

et al. 2001

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“…Core(s) collected during soil coring in the vicinity of the biobarrier can also be used to qualitatively assess expected variations in hydraulic conductivity, and laboratory permeability tests can be conducted on samples from the core(s). Gas injection zone of influence characterization (for gas injection–based oxygen delivery systems) to determine appropriate gas injection well locations and screened interval(s). The characterization/pilot test activities discussed in Johnson et al (2001a, 2001b 2001c, 2001d, 2001e) and Bruce et al (2001) can be used for this purpose.…”

Section: Basic Design Paradigmmentioning

confidence: 99%

“…Gas injection zone of influence characterization (for gas injection–based oxygen delivery systems) to determine appropriate gas injection well locations and screened interval(s). The characterization/pilot test activities discussed in Johnson et al (2001a, 2001b 2001c, 2001d, 2001e) and Bruce et al (2001) can be used for this purpose.…”

Section: Basic Design Paradigmmentioning

confidence: 99%

A Practical Approach to the Design, Monitoring, and Optimization of In Situ MTBE Aerobic Biobarriers

Johnson¹,

Bruce

Miller³

2010

Groundwater Monitoring Rem

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A paradigm for the design, monitoring, and optimization of in situ methyl tert‐butyl ether (MTBE) aerobic biobarriers is presented. In this technology, an oxygen‐rich biologically reactive treatment zone (the “biobarrier”) is established in situ and downgradient of the source of dissolved MTBE contamination in groundwater, typically gasoline‐impacted soils resulting from leaks and spills at service station sites or other fuel storage and distribution facilities. The system is designed so that groundwater containing dissolved MTBE flows to, and through, the biobarrier treatment zone, ideally under natural gradient conditions so that no pumping is necessary. As the groundwater passes through the biobarrier, the MTBE is converted by microorganisms to innocuous by‐products. The system also reduces concentrations of other aerobically degradable chemicals dissolved in the groundwater, such as benzene, toluene, xylenes, and tert‐butyl alcohol. This design paradigm is based on experience gained while designing, monitoring, and optimizing pilot‐scale and full‐scale MTBE biobarrier systems. It is largely empirically based, although the design approach does rely on simple engineering calculations. The paradigm emphasizes gas injection–based oxygen delivery schemes, although many of the steps would be common to other methods of delivering oxygen to aquifers.

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Helium Tracer Tests for Assessing Contaminant Vapor Recovery and Air Distribution During In Situ Air Sparging

Cited by 11 publications

References 4 publications

Diagnostic Tools for Integrated In Situ Air Sparging Pilot Tests

Diagnostic Tools for Integrated In Situ Air Sparging Pilot Tests

Diagnosis of in Situ Air Sparging Performance Using Groundwater Pressure Changes During Startup and Shutdown

A Practical Approach to the Design, Monitoring, and Optimization of In Situ MTBE Aerobic Biobarriers

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