Vapor Intrusion

Essay specific features

 

Issue:

Science

 

Written by:

David H

 

Date added:

September 26, 2015

 

Level:

University

 

Grade:

A

 

No of pages / words:

2 / 419

 

Was viewed:

8346 times

 

Rating of current essay:

 
Essay content:

Specifically, USEPA and various state agencies such as MADEP, PADEP, NYSDEC and most recently NJDEP, have developed vapor intrusion guidance documents. Although there are many similarities in the guidance documents, the differences can be considerable. Therefore, this presentation will provide a comparison of the primary differences in the documents including an analysis of the different critical chemical of concern screening criteria, matrix specific screening approaches, soil gas sampling, and indoor air sampling techniques...
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As an example, one guidance document allows the use of Johnson & Ettinger (J&E) model to conservatively estimate vapor intrusion potential based on site-specific ground water and/or soil gas data and critical building parameters. However, there are subtle but noteworthy differences in the J&E model default input parameters prescribed by the various regulatory agencies, which can result in a significant variation in modeled indoor air concentrations and consequently the selection of the appropriate VMS design approach...
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