In contrast to ECs, ICs are primarily government controls, proprietary controls, enforcement or permit mechanisms, and informational devices. Two fact sheets, Conceptual Site Models for Vapor Intrusion Mitigation and Public Outreach During Vapor Intrusion Mitigation provide information that is relevant throughout the entire mitigation effort. Note that some technologies or mitigation methods characterized in this document as rapid response may also be suitable as long-term mitigation strategies. Vapor Intrusion Assessment Vapor intrusion is a pathway of potential human exposure to volatile chemicals below buildings. In most cases, advective flux of COCs across the slab is the dominant transport mechanism of concern. Active Mitigation Systems8. While ICs consist of administrative or legal restrictions on a site, LUCs can also use physical measures, which are called engineering controls or ECs (e.g., physical barriers). Additionally, measurement of sub-slab vapor COC concentrations over time provides evidence that the AVMB system is effectively reducing petroleum hydrocarbon and methane COCs. Active mitigation is chosen because, although natural forces (e.g., thermal gradients or wind) can induce negative air pressures and air flow below a slab (i.e., passive systems), these forces are generally weaker and much more variable than the pressures and air flows that can be induced by electric fans. The two Q&A sessions included technical and general overview sessions on each day. Soil Vapor Intrusion: Frequently Asked Questions Sheet (PDF, 122KB, 4pg) Describes the process referred to as "soil vapor intrusion". When planning an outreach strategy, decide which fact sheets and other tools best support the information you want to communicate to neighbors and other interested parties. This document provides regulators, practitioners (i.e., environmental consultants or engineers), and parties responsible for the release of these contaminants, as well as public and tribal stakeholders, with consensus information based on data, research, and experience gained from case studies, to support VI mitigation decision making under different regulatory frameworks. 0000066955 00000 n Depending on the >> Knowledge of VI topics provides the foundation to understand the requirements, implementation, and verification of an adequate VI mitigation strategy that protects public health. Rapid Response and Ventilation7. For buildings equipped with an engineered HVAC system, VI mitigation may be accomplished using HVAC as an engineering control. Complex mitigation strategies will typically require more complex OM&M procedures. Their cooperation, not just permission, makes it possible to investigate, remediate, mitigate, and monitor at properties where COCs may be present. /E 99408 Conceptual site models for VI are typically developed and modified throughout the investigative process. Vapor intrusion is a way in which chemicals in soil or groundwater can get into indoor air (see figure at right). <> The Executive Summary Fact Sheet highlights the topics suggested and briefly describes the four recommended steps for screening and evaluating vapor intrusion. /Linearized 1.0 /MediaBox[0 0 612 792] The VI Mitigation CSM helps the practitioner evaluate the potential for a complete VI pathway, identify data gaps, and communicate findings and conclusions to other stakeholders. Topics covered in this fact sheet include characterizing community concerns, unique topics for the community involvement plan, and logistical considerations for the community involvement plan specifically pertaining to VI concerns. As it relates to the VI pathway, ICs can be applied as a stand-alone remedy (for undeveloped lands or restricted use on developed land), as part of an overall remedy selection, or as a permit that requires ongoing monitoring and maintenance of the mitigation system. 191 0 obj Purpose. 164 0 obj and how the system is affecting the building (e.g., differential pressure field extension under the slab, indoor air samples, etc.). After the installation of an active  (see Active Mitigation Fact Sheet) or passive (see Passive Mitigation Fact Sheet) mitigation system, or implementation of an environmental remedial technology (see Remediation and Institutional Controls as Vapor Intrusion Mitigation Fact Sheet), post-installation verification and testing for confirmation of the design and operating parameters is often required. These VOCs can pose a health Other passive mitigation measures detailed in the fact sheet include passive venting systems, such as passive sub-slab venting and aerated floor systems (AFS), and building design specifications, such as raised foundations or vented garages. 0000000911 00000 n � ����,�4���k5 �r�⁚� �C[�$x��KL��p�bh��}p�S�t�%M(���5��� �\l�T�l#��V�d*�(<7���?B��������I&�:�g=�����IP!�C�8n*�.�f0H�v΂L��d_�n�#m�������O��U��ȅ���m � �; E� m*����\�1��ac�1�N��(�C]d�r}�=RE� J��#PB�T��T These chemicals may be released to the soil and groundwater from various sources including chemicals spilled on the ground at a factory or leaked from an underground storage tank. << Vapor intrusion is a way in which chemicals in soil or groundwater can get into indoor air (see figure at right). Vapor Intrusion Guidance Quick Links Select a … x�c``f``�b`f`��b�g@ ~V da�8���7��A�+y�V�t�c�����%��s� - ��`qUF������\&�|@��,�Y�N3���$r�q�q�r���-V��P� ��E�P��KviV�� �\� For there to be a health concern, contaminated vapor has to get into the indoor air at relatively high levels AND people need to breathe the contaminated indoor air vapor … While an institutional control (e.g., land use restriction) may be in place for a site that requires VI mitigation for new construction (such as when constructing on an undeveloped site with known contamination), pre-emptive mitigation is commonly selected even when VI impacts do not warrant VI mitigation. NAVFAC-Vapor Intrusion Fact Sheet-Existing Structures: File Size: 4382 kb: File Type: pdf: Download File. endobj As leaders in the assessment and management of subsurface vapor intrusion to indoor air, our practitioners maintain a comprehensive list of vapor intrusion guidance, and share it below to advance the state of the vapor intrusion practice. The objective of VI mitigation is to reduce indoor air COCs due to VI below applicable action or screening levels. APUs—commonly adsorption-based units that use a particulate filter and granular activated carbon—can be ducted onto the HVAC system or used as stand-alone, portable or wall-mounted units. 0000091032 00000 n What is Vapor Intrusion (RR-892) [PDF] - This fact sheet defines vapor intrusion, why it is a problem and what to expect if it is suspected near a home or business. endstream The Conceptual Site Models for Vapor Intrusion Mitigation Fact Sheet provides a general overview of the VI pathway, including the locations and types of vapor sources, subsurface vapor transport mechanisms, foundation and other building conditions affecting the rate … Date: September 2020. 166 0 obj These lines of evidence include readings from the system (e.g., air flow rate, vacuum, etc.) 0000001318 00000 n %PDF-1.6 The Aerobic Vapor Mitigation Barrier Technology Information Sheet describes a method for in situ VI mitigation and remediation at sites with existing buildings situated above subsurface sources of VOCs that rapidly biodegrade aerobically—namely, petroleum hydrocarbons and methane. 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