EPA confirmed nearly 3,000 new releases from underground storage tanks (USTs) during fiscal year 2010, bringing the cumulative total to 491,572 releases since 1984. Although progress has been made in cleaning these sites, over 96,000 of them still require remedial action. (Source: Semiannual Report of UST Performance Measures, Mid Fiscal Year 2010, 3/31/2010.). These UST leaks pose a grave threat to human health and the environment by contaminating groundwater and soil.
As an alternative to traditional pump-and-treat and soil excavation, air sparging is an in-situ remedial technology that reduces concentrations of volatile constituents in petroleum products that are adsorbed to soils and dissolved in groundwater. In-situ air sparging (IAS) involves the injection of contaminant-free air into the subsurface saturated zone, enabling a phase transfer of hydrocarbons from a dissolved state to a vapor phase. Air is then vented through the unsaturated zone. Air sparging is generally more applicable to the lighter gasoline constituents (i.e., benzene, ethylbenzene, toluene, and xylene), because they readily transfer from the dissolved to the gaseous phase. Air sparging is most often used together with soil vapor extraction (SVE), but it can also be used with other remedial technologies.
This course is intended for environmental engineers who wish to expand their knowledge of alternative methods of site remediation. Course material is based on publication EM 1110-1-4005 from the US Army Corps of Engineers.
To earn PDH credits, you will be required to pass a multiple choice quiz consisting of forty-five (45) questions.
Specific Knowledge or Skill Obtained
This course teaches the following specific knowledge and skills:
- Related technologies, such as biosparging and SVE
- Physical processes
- Effectiveness and limitations
- Technology screening strategy
- Pre-design data collection
- Pilot testing
- Design considerations
- System construction
- Operations and maintenance (O & M)
- System shutdown and confirmation of cleanup
- Regulatory and patent issues
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