Mass to concentration tie-in for passive soil gas surveys: Improved technique for source area, spatial variability and vapor intrusion assessment

Joseph E. Odencrantz, Harry O'Neill, Paul C. Johnson

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

The mass to concentration tie-in [MtoC Tie-in] correlates passive soil gas (PSG) data in mass to active soil gas data in concentration determined by EPA Method TO-17 or TO-15. Passive soil gas surveys consist of rapid deployment of hydrophobic sorbents (dozens to several hundred locations typically installed in one day) to a depth of six-inches to three-feet in a grid pattern with exposure in the field from three days to two weeks to target a wide variety of organic compounds. A power function is used on a compound-to-compound basis to correlate spatially varying mass (nanograms) from selected locations within a passive soil gas survey to concentration (ug/m3) at those same locations. The correlation from selected PSG locations is applied to the remainder of the PSG grid. The MtoC Tie-in correlations provide added value to a PSG survey, with the PSG data then used to estimate risk throughout the limits of the investigation for quantitative assessment. The results from a site in Northern California show the MtoC Tie-in correlations for both Benzene and Total Petroleum Hydrocarbons (TPH). The correlations are applied on a compound-to-compound basis to the remaining locations in the PSG-grid to provide an estimate of concentration that can be used for comparison to risk/screening levels or fate and transport diagnostic tools (partitioning equations, solubility laws, etc.). An example of how the correlations are applied is presented in tabular form. The results from a chlorinated solvent survey show the MtoC Tie-in correlation from a site in Maryland for Tetrachloroethylene (PCE). In this instance, there was a near-perfect relationship between the PSG mass and the active soil gas concentration (R-squared value of 1). The concentration estimated throughout a PSG-grid enables a vast new realm of interpretive power at sites. Several other sites are discussed.

Original languageEnglish (US)
Title of host publicationAir and Waste Management Association - Vapor Intrusion Conference 2009
Pages436-475
Number of pages40
Volume1
Edition180 CP
Publication statusPublished - 2009
EventAir and Waste Management Association - Vapor Intrusion Conference 2009 - San Diego, CA, United States
Duration: Jan 27 2009Jan 30 2009

Other

OtherAir and Waste Management Association - Vapor Intrusion Conference 2009
CountryUnited States
CitySan Diego, CA
Period1/27/091/30/09

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Keywords

  • Beacon Environmental Services, Inc.
  • Mass to concentration tie-in correlation
  • Passive soil gas sampling
  • Risk assessment
  • Sorbent tube
  • Time-integrated sampling
  • TO-17
  • U.S EPA
  • Vapor intrusion evaluation

ASJC Scopus subject areas

  • Filtration and Separation
  • Fluid Flow and Transfer Processes
  • Process Chemistry and Technology

Cite this

Odencrantz, J. E., O'Neill, H., & Johnson, P. C. (2009). Mass to concentration tie-in for passive soil gas surveys: Improved technique for source area, spatial variability and vapor intrusion assessment. In Air and Waste Management Association - Vapor Intrusion Conference 2009 (180 CP ed., Vol. 1, pp. 436-475)