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(DWM) Vapor Intrusion Guidance Document Was Developed Using Established Guidance from U.S

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(DWM) Vapor Intrusion Guidance Document Was Developed Using Established Guidance from U.S VAPOR INTRUSION GUIDANCE DIVISION OF WASTE MANAGEMENT NORTH CAROLINA DEPARTMENT OF ENVIRONMENTAL QUALITY MARCH 2018 Version 2 ACKNOWLEDGEMENTS The Division of Waste Management (DWM) Vapor Intrusion Guidance document was developed using established guidance from U.S. EPA, the Interstate Technology and Regulatory Council (ITRC) and other states, modified for the purposes of DWM. Special thanks to New Jersey Department of Environmental Protection (DEP) for permission to use the NJ DEP’s October 2005 Vapor Intrusion Guidance and subsequent updates as a template. In some instances, exact phrasing from the NJ DEP October 2005 Vapor Intrusion Guidance or other updates was used. Special thanks to: Michael Scott, DWM, Division Director Dexter Matthews, DWM, Former Division Director Linda Culpepper, DWM, Former Division Director Primary Author: Delonda Alexander, DWM, Superfund Section The following DWM staff participated in the development of this guidance either through the DWM Remediation Team or providing comments: Hanna Assefa Brad Atkinson Pete Doorn Jaclynne Drummond Sharon Ghiold Karen Harmon Charlotte Jesneck Kelly Johnson Ervin Lane George Lane David Lilley Robert McDaniel Janet Macdonald Linda Smith Larry Stanley Cover graphic courtesy of U.S. Environmental Protection Agency (USEPA) ii DISCLAIMER The use of any trade names, products or materials in this document does not constitute an endorsement by DWM or the North Carolina Department of Environmental Quality (DEQ). The information in the DWM’s Vapor Intrusion Guidance document is provided free of charge to the public. The State of North Carolina, its agencies and employees assume no responsibility to any person or entity for the use of this information. There are no representations or warranties, expressed or implied, of any kind with regard to this information, and any use of this information is made at the risk of the user. This guidance document serves as an instructional tool for the investigation and evaluation of vapor intrusion at sites in the DWM and is not meant as a regulatory document. Neither DWM nor the State of North Carolina maintains many of the web links and web addresses in DWM’s Vapor Intrusion Guidance. DWM makes no special endorsement for the content of these links, their sites or the views expressed by the sites’ publishers. Websites may change or remove their contents at any time. Therefore, DWM cannot guarantee that the material on the referenced websites will be the same as it was when the Vapor Intrusion Guidance was developed or that the links will be available. iii TABLE OF CONTENTS ACKNOWLEDGEMENTS ........................................................................................................................................... ii DISCLAIMER .............................................................................................................................................................iii ABBREVIATION LIST .............................................................................................................................................. vii 1.0 PURPOSE AND APPLICABILITY .............................................................................................................. 1 2.0 INTRODUCTION .......................................................................................................................................... 2 2.1 Conceptual Site Model .................................................................................................................................... 2 2.2 Factors Affecting Vapor Migration ................................................................................................................. 3 2.3 Receptors ......................................................................................................................................................... 4 2.4 Factors Affecting Indoor Air Quality .............................................................................................................. 7 3.0 SCREENING LEVELS .................................................................................................................................. 8 4.0 INVESTIGATION .......................................................................................................................................... 9 4.1 Preliminary Evaluation ................................................................................................................................... 9 4.2 General Considerations ................................................................................................................................ 10 4.2.1 Investigation Area ................................................................................................................................ 10 4.2.2 Chemicals of Concern .......................................................................................................................... 10 4.2.3 Underground Utilities .......................................................................................................................... 11 4.2.4 Landfills and Methane Gas .................................................................................................................. 11 4.2.4.1 Methane .......................................................................................................... 12 4.2.4.2 Landfill Gases ................................................................................................. 12 4.2.4.3 Landfill Gas Production and Flow ................................................................. 12 4.2.4.4 Methane Investigations and Analytical Methods ............................................ 13 4.3 Groundwater ................................................................................................................................................. 15 4.3.1 Groundwater Sampling ........................................................................................................................ 16 4.4 Soil Gas ......................................................................................................................................................... 16 4.4.1 Source Area Soil Gas ........................................................................................................................... 16 4.4.2 Sub-slab Soil Gas ................................................................................................................................. 16 4.4.2.1 Sampling Considerations ................................................................................ 17 4.4.2.2 Number, Location and Frequency of Sampling .............................................. 17 4.4.3 Exterior Soil Gas .................................................................................................................................. 18 4.4.3.1 Number, Location and Frequency of Sampling .............................................. 18 4.4.3.2 Undeveloped Land and Future Use ................................................................ 19 4.4.4 Sampling Procedure ............................................................................................................................. 19 4.4.5 Passive Sample Collection Methodologies ........................................................................................... 20 4.5 Building Survey and Pre-Sampling Evaluation ............................................................................................. 21 4.5.1 Detection of Potential Background Sources ......................................................................................... 22 4.5.2 Recognition of Points of Vapor Intrusion in a Building ....................................................................... 22 4.5.3 Education of the Occupants on Vapor Intrusion and Sampling Procedures ........................................ 23 4.6 Crawl Space .................................................................................................................................................. 23 iv 4.7 Indoor Air ...................................................................................................................................................... 24 4.7.1 Background Indoor Air Sources ........................................................................................................... 25 4.7.1.1 Outdoor Air ..................................................................................................... 26 4.7.2 Sampling Considerations ..................................................................................................................... 27 4.7.3 Number, Location, Duration and Frequency of Sampling ................................................................... 27 4.7.3.1 Co-Located Properties .................................................................................... 28 4.7.4 Sampling Procedures ........................................................................................................................... 28 4.7.4.1 Passive Samplers ............................................................................................ 29 4.8 Quality Assurance/Quality Control ............................................................................................................... 29 5.0 DATA EVALUATION AND SCREENING ................................................................................................ 30 5.1 Groundwater ................................................................................................................................................
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