API Publ 4775
Simulating the Effect of Aerobic Biodegradation on Soil Vapor Intrusion into Buildings—Evaluation of Low Strength Sources Associated with Dissolved Gasoline Plumes
Standard by API, 2009
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Availability: Immediate Download
Language: English
License Type: Single User
Updates: Not Included
About This Item
Simulating the Effect of Aerobic Biodegradation on Soil Vapor Intrusion into Buildings — Evaluation of Low Strength Sources Associated with Dissolv ed Gasoline Plumes Aerobic biodegradation can contribute significantly to the attenuation of petroleum hydrocarbon vapors in th e unsaturated zone; however, most regulatory guidance for assessing potential human health risks via vapor intrusion to indoor air either negl ect biodegradation or only allow for one order of magnitude ad ditional attenuation for aerobically degradable compounds, which may be overly conservative in many cases. This paper describes results from three - dimensi onal numerical model simulations of vapor intrusion for petroleum hydroc arbons to assess the influence of aerobic biodegradation on the attenuati on factor for a variety of source concentrations and depths for buildings with basements and slab - on - grade construction. Provided that oxygen is present in the vadose zone, aerobic biodegradation of petroleum hydrocarbon vapors in the unsaturated zone will reduce the soil gas concentrations and the potential risks from vapor intrusion to indoor air compared to nondegrading compounds. At lower source concentrations and/or deeper source depths, aero bic biodegradation may result in a reduction in vapor intrusion attenuation factors by many orders of magnitude. The magnitud e of the reduction depends on site - specific conditions, which should be considered in the development of a conceptual site model for each site. However, oxygen supply and degradation rates are likely to be sufficie nt at many sites to mitigate potential risks from vapor intrusion for low va por concentration sources (less than
SKU: 538a50fb36b9
- Publication Date: 2009
- Publisher: API
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