soil gas Articles

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EEA Signals 2015 - Living in a changing climate

by European Environment Agency (EEA)  (Jun. 30, 2015)

Our climate is changing. Scientific evidence shows that the global average temperature is rising, and rainfall patterns are shifting. It also shows that glaciers, Arctic sea ice and the Greenland ice sheet are melting. The Intergovernmental Panel on Climate Change′s Fifth Assessment Report shows that the warming since the mid-20th century is ...

Evaluating Leaks in a Soil Gas Sampling Train

by Eurofins Air Toxics Inc  (Sep. 16, 2013)

ABSTRACT The current advisory for active soil gas investigations in California requires leak tests to be conducted at eveiy soil gas probe while taking a sample. A leak may allow ambient ak into the sample train thus diluting the soil gas and underestimating the results. Also, the leak check compound itself may have impurities thereby ...

Impact of Sampling Media on Soil Gas Measurements

by Eurofins Air Toxics Inc  (Sep. 1, 2006)

Abstract To evaluate the vapor intrusion pathway for a building and to assess the associated human health risks, soil gas samples near the building site and under the building foundation may be collected. In order to meet risk assessment goals, the analytical laboratory is often required to report compounds of concern for these soil gas samples ...

Soil Fracturing

by Federal Remediation Technologies Roundtable  (Jan. 1, 1997)

Introduction Fracturing is an enhancement technology designed to increase the efficiency of other in situ technologies in difficult soil conditions. The fracturing extends and enlarges existing fissures and introduces new fractures, primarily in the horizontal direction. When fracturing has been completed, the formation is then subjected to vapor ...

Phosphorus and greenhouse gas dynamics in a drained calcareous wetland soil in Minnesota

by Soil Science Society of America  (Aug. 24, 2009)

Received for publication September 15, 2008. Restoration of wetland hydrology can produce ecological benefits but may have unintended consequences. We examined effects of altered water level on release of dissolved reactive phosphorus (DRP) and greenhouse gases (GHG) in soil cores from a marsh being evaluated for restoration. We also measured ...

The Measurement of Gas Bubble Size Distributions in a Three Phase Laboratory Gassy Soil

by ASTM International  (Mar. 1, 1988)

The technique developed can be used to measure the total void, gas void, or particle size distribution in both gassy and saturated sediments provided the void spaces, or particles, can be approximated to spheres. Here the technique is demonstrated for measuring gas bubble size distribution in a reconstituted estuarine silty clay, which has been ...

Off-Gas Treatment Technologies for Soil Vapor Extraction Systems: State of the Practice

by US EPA - Environmental Protection Agency  (Jun. 1, 2006)

Untitled Document EXECUTIVE SUMMARY This document provides state-of-the-practice information on off-gas treatment technologies for soil vapor extraction ...

Greenhouse gas emissions and global warming potential of reclaimed forest and grassland soils

by Soil Science Society of America  (Mar. 1, 2009)

Received for publication June 19, 2008. Although greenhouse gas (GHG) emissions from soils are important, reclaimed mine soil (RMS) ecosystems are not widely assessed. Postreclamation land uses (forest, hay, and pasture) were investigated to: (i) monitor the magnitude of GHG fluxes, (ii) estimate their global warming potential (GWP), (iii) ...

Groundwater Plume, Source and Risk Identification Using Passive Soil Gas

by Beacon Environmental Services, Inc.  (May 19, 2008)

Abstract The results from sixty passive soil gas (PSG) samplers placed at a grain silo and mixed-use industrial facility with a known chlorinated solvent release aided with the rapid investigation time-schedule. The samplers were used to determine potential sources, plume extent and vapor risks in areas beyond the previous discrete soil sampling ...

Soil CO2 Flux Measurements -- Using the LI-8100 System to Collect Air Samples for Estimating Soil Trace Gas Flux

by LI-COR  (Jan. 1, 2006)

Air samples can be collected from the same air stream used to measure soil CO2 flux with the LI-8100 Automated Soil CO2 Flux System, for estimating the flux of trace gas, such as methane (CH4), ammonia (NH3), nitrous oxide (N2O), isotopic species, etc. This application note describes a simple method for obtaining air samples from the ...

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