Vadose zone profiling to better understand vadose zone processes related to vapor intrusion.

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Abstract	This paper is focused on vadose zone processes and high resolution characterization as a means of refining site-specific conceptual models for vapor intrusion investigations. Much of the existing regulatory guidance is driven by the perception that vapor intrusion potential and indoor air quality are mainly a function of contemporaneous groundwater quality with limited recognition of vadose zone processes. In addition, regulatory policies founded on limited field experience are evolving toward not recognizing the use of exterior subsurface gas investigations as a component of vapor intrusion investigations. We believe that programs of vadose zone characterization including multilevel monitoring of gas phase can yield improved understanding of site conditions. As shown in the first section of the body of this paper, data and observations from project work at soil and bedrock sites indicate that spatial and temporal variability often observed in vapor intrusion investigations can typically be explained by variations in subsurface conditions relevant to vapor migration, as well as seasonally variable infiltration and soil moisture conditions. Site data confirm that considerable volatile organic compound (VOC) mass may be partitioned into
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Subject Keyword	Vadose Zone Profiling Vapor Intrusion Vapor Intrusion Investigation Site-specific Conceptual Model Bedrock Site Vapor Intrusion Potential High Resolution Characterization Project Work Site Condition Vadose Zone Variable Infiltration Improved Understanding Site Data Subsurface Condition Regulatory Policy Limited Field Experience Multilevel Monitoring Regulatory Guidance First Section Contemporaneous Groundwater Quality Vadose Zone Process Soil Moisture Condition Limited Recognition Considerable Volatile Organic Compound Temporal Variability Gas Phase Indoor Air Quality Exterior Subsurface Gas Investigation
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Resource Type	Article