March 5, 2019

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Chase Holton Coauthored a Paper on Pressure Cycling for Evaluating Vapor Intrusion in Groundwater Monitoring and Remediation Journal

Chase Holton, Ph.D., P.E. (Colorado) coauthored a paper entitled "Key Design Elements of Building Pressure Cycling for Evaluating Vapor Intrusion—A Literature Review" published in the journal Groundwater Monitoring and Remediation (GWMR) on pages 66-72 in Volume 39, Issue 1 on October 30, 2018.

His coauthors were Christopher C. Lutes, Robert Truesdale, John H. Zimmerman, and Brian Schumacher.

Chase has over eight years of experience in environmental research and consulting, with expertise and experience in several areas, including vapor intrusion, site characterization, and soil and groundwater remediation.

Chase also worked to identify and address soil and groundwater contamination at numerous sites across the U.S. and Canada under the Resource Conservation and Recovery Act (RCRA), Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), Underground Storage Tanks (UST) Regulations, Voluntary Cleanup and other regulatory programs, including chlorinated solvents, petroleum compounds, pesticides, and per- and polyfluoroalkyl substances (PFAS).

Published by the National Ground Water Association (NGWA), GWMR is a source for researchers and practitioners in the field. It is a quarterly journal that offers application oriented, fully peer-reviewed papers together with insightful articles from the practitioner's perspective. Each issue features information on treatment technology as well as EPA updates, news briefs, industry announcements, equipment news, professional services, annual directories, and buyer's guides.

NGWA is a community of groundwater professionals working together to advance groundwater knowledge and the success of our members through education and outreach; advocacy; cooperation and information exchange; and enhancement of professional practices.


Building pressure cycling (BPC) is becoming an increasingly important tool for studying vapor intrusion. BPC has been used to distinguish subslab and indoor sources of vapor intrusion as well as to define reasonable worst case volatile organic compound mass discharge into a structure. Analyses have been performed both semi‐quantitatively with concentration trends and quantitatively with more rigorous flux calculation and source attribution methods. This paper reviews and compares the protocols and outcomes from multiple published applications of this technology to define the key variables that control performance. Common lessons learned are identified, including those that help define the range of building size and type to which BPC is applicable. Differences in test protocols are discussed, recognizing that the complexity of the test protocol required depends on the particular objectives of each project. Research gaps are identified and tabulated for future validation studies and applications.

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