Vapor Intrusion Mitigation: Answering the Common Questions Plaguing Brownfield Developers West Virginia Brownfields Conference
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1 Vapor Intrusion Mitigation: Answering the Common Questions Plaguing Brownfield Developers 2014 West Virginia Brownfields Conference Adam Richards PE Land Science Technologies
2 Land Science Technologies develops vapor intrusion mitigation solutions that protect people and invigorate renewal of contaminated properties. We leverage our industry expertise to assist clients develop site specific solutions that are technically sound and cost-effective.
3 What is Vapor Intrusion?
4 Agenda To mitigate or not to mitigate? What are my mitigation options? Existing structures New construction Site Examples Which mitigation option is better for my site, passive or active? Remediation is ongoing but what can I do to address vapors now? How do I reduce my long term liability and cost? What s the cost?
5 To mitigate or not to mitigate?
6 Vapor Intrusion Why mitigate? Remediation alone may not eliminate VI risk VI standards are still developing Protect client s investment and avoid future litigation Pre-emptive mitigation achieving traction Bottom Line: Significant increase in awareness of the VI pathway and attention to mitigation remedies by all vested parties
7 What are my mitigation options? Venting Active Sub Slab Depressurization Passive Passive Barrier System Vapor Intrusion Barriers Membranes Coatings
8 Safe Building Design
9 Active Venting Existing Structures Benefits Mechanical removal of vapors Gold standard with robust barrier Radon system - single family homes Limitations Long term O&M requirement Fan may need to run forever Permeability of sub-slab material Vapors drawn closer to structure Air permits
10 Passive Barrier System New Construction Benefits Utilizes vapor intrusion barrier Always on (No long term O&M) Can convert to active if needed Limitations May not be ideal for high risk sites Ideal for new construction Some regulators may prefer active Not a standalone system
11 Passive Gas Barrier Collection Cross Section Options
12 Vent Layout Example
13 Vent Riser Detail
14 Barriers used for Vapor Intrusion Thin mil water vapor barriers HDPE geo-membranes Spray asphalt latex membranes Composite membranes (Geo-Seal) Coating Systems (Retro-Coat)
15 Vapor Intrusion Barriers Key evaluation indicators for VI barriers Chemical resistance of material Material compatible with chemical vapors Vapor permeation testing of COC Constructability Vapor tight seal eliminate all VI pathways Durable to construction process Quality Control Certified applicators & 3 rd party inspection Smoke testing & thickness verification Warranties for VI
16 Thin Mil Water Vapor Barriers Benefits Inexpensive Anyone can install it Limitations Water vapor chemical vapor Quality of installation - Tape Not warranted for VI Not recommended by EPA for Vapor Intrusion
17 Barrier Thickness USEPA - 30 mil min. NJDEP - 40 mil min. MASS mil min. ILEPA - 60 mil min. MDEQ 60 mil min.
18 HDPE Geomembranes Benefits Great chemical resistance Long history in landfill applications Limitations Difficult to seal rigid sheet to building penetrations and foundations Batten and welded systems are labor intensive Limited quality control
19 Spray-applied Asphalt Latex Membranes Benefits Solves construction limitations of HDPE membranes Common for methane mitigation Limitations VOC s attack exposed asphalt/latex Increase in vapor permeation over time
20 Geo-Seal New Construction Benefits Blends HDPE and spray applied membranes Highly constructible and chemically resistant 1 st patented vapor intrusion barrier Designed for VOC protection Customizable: waterproofing, site concentrations, retrofit Limitations Not a traffic bearing surface
21 Retro-Coat Existing Buildings Benefits Most chemically resistant barrier available Specifically designed for VI Chemical vapor permeation testing to PCE, TCE and Benzene No VOC s or odors Industrial rating for vehicle traffic Customizable finishes Limitations Must be maintained for aggressive environments
22 Which mitigation option is better for my site, passive or active? Question #3
23 Residential Application Parking Retro-Coat Garage of CORE Geo-Seal 20,000 SF below grade parking garage Passive barrier retrofit Regulator mandated High water table/low permeability
24 Auto Manufacturing Application Retro-Coat Facility of CORE Retro-Coat 30,000 SF manufacturing facility Low soil permeability Remediation & mitigation Passive venting Floor exposed to fork lift traffic
25 Remediation is ongoing but I what can I do to address vapors now? Questions 4
26 Big Box Store Geo-Seal 160,000 square feet big box Former manufacturing facility Regulator mandated Preemptive mitigation
27 Single Family Application Homes of CORE Retro-Coat 7 Residential basements Off site plume migration High water table/low perm SSD systems Unacceptable
28 Question #5 How do I reduce my long term liability and cost?
29 Apartment Complex - Geo-Seal Multiple building complex Passive venting Off site plume migration Preemptive approach
30 Application of CORE Cafe Retro-Coat 7,000 sf Cafe Legacy Solvent Plume 2 Tone Custom Flake Finish Pre-emptive Mitigation Result of New TCE Levels
31 What s the cost? Question #6
32 Costs Protective Layers HDPE 60 Mil Thin Mil Sheets Asphalt/ Latex Geo-Seal Retro-Coat Ease of Constructability Long-Term VOC Resistance Warranty Low Undefined High High High Excellent Unknown Low High High 1 year material For water vapor only Up to 20 year material Up to 30 year material, 20 year system Project specific Color Black Various Black White Customized finishes Cost* $5.00 to $6.00 $ $1.75 $2.75 to $3.75 $2.75 to $3.75 $3.00 to $4.00 * 20,000 SF Building
33 Evaluating Mitigation Options Managing long term liability and protecting investment Preemptive Mitigation Mitigate vs further site investigation Cost for mitigation is many times less than long term monitoring New construction or existing building Incorporate system in buildings plans or retrofit Active or Passive systems Long term O&M vs. low maintenance
34 Adam Richards (312)
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