The Design, Installation, and Use of Vapor Intrusion Barrier Systems October 1, 2014
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1 The Design, Installation, and Use of Vapor Intrusion Barrier Systems October 1, 2014
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 Why are we here? 1. Stringent screening levels for PCE and TCE 2. COC s are not naturally occurring 3. The cost to mitigate is low relative to property value 4. Companies worry about their brand
4 The New Reality 1. Collect enough data to prove there is no longer a vapor intrusion risk 2. Pre-emptively mitigate
5 Existing Buildings Pro Small structures can be inexpensive New technologies can aid monitoring Con Difficult to get it right Many unknowns O&M plan required Can be very expensive
6 New Construction Pro Open Canvas Flexibility Can adapt mitigation to building Con Higher level of scrutiny Investment not seen Regulations may change
7 Intrinsically Application Safe of CORE Building
8 Void Space Benefits Built in crawl space Can reduce the amount of imported fill Can reduce the size of fan Limitations Decision to mitigate needs to be made very early on Outside of GC s comfort zone Can be an expensive alternative to an active system
9 Active Systems Benefits Physically removes vapors Gold standard with robust barrier Poor design can still work Limitations Building characterization req. O&M required Permits may be required Does not mitigate building sources
10 Passive Systems Benefits Combines mitigation approaches Always on Flexibility, can active if needed Seek to alleviate build up Limitations May not be ideal for high risk sites Not ideal for existing structures
11 Vapor Intrusion Barriers 1. Designed to physically block vapors from entering a structure 2. Regularly combined with an passive or active vapor collection system 3. Preferred for new construction
12 Multiple Lines of Defense Construction Planning Vapor Collection Design Membrane Selection and Implementation Quality Assurance and Documentation
13 Construction Planning This is a construction site! The General Contractor is your friend Need to understand how the structure will be build
14 Detailed Site Plans Client Protected
15 Anticipating Challenges Client Protected
16 Detailed Vent Layout Client Protected
17 Vent Material Options Vent Pipe Options Low Profile Slotted PVC Perforated ADS Mechanical options Whirly Bird In-line blowers
18
19
20 Design Example
21 Design Example
22 Design Example
23 Application of CORE
24
25 Barriers used for Vapor Intrusion Thin mil water vapor barriers HDPE geomembranes Spray asphalt latex membranes Composite systems (Geo-Seal) Coating Systems (Retro-Coat)
26 Evaluation of Physical Barriers 1. Chemical Resistance 1. How well does the material block contaminants 2. Does test data support intended use 2. Constructability 1. Ability to install barrier quickly and effectively 2. Ability of barrier to withstand the construction process 3. Cost 1. The trade off of paying for something proven
27 Thin Mil Water Vapor Barriers Benefits Inexpensive Anyone can install it Limitations Water vapor chemical vapor Not warranted for VI Not recommended by EPA for Vapor Intrusion
28 USEPA - 30 mil min. NJDEP - 40 mil min. MASS mil min. ILEPA - 60 mil min. MDEQ mil min.
29 HDPE Geomembranes Benefits Great chemical resistance Long history in landfill applications Limitations 40 to 60 mil sheets are difficult and time consuming to install Difficult in installation increases cost Limited quality control
30 Spray-applied Asphalt Latex Membranes Benefits Solves construction limitations of HDPE membranes Common for methane mitigation Limitations VOC s can attack unprotected asphalt/latex
31 Composite Membranes Benefits Blends HDPE and spray membranes Creates redundant layers Designed for VOC protection Customizable 685X lower diffusivity than asphalt latex membranes Limitations Not a traffic bearing surface
32 Retro-Coat Benefits Most chemically resistant barrier available No VOC s Designed to mitigate Vapor Intrusion Customizable Ideal in existing buildings Limitations Not ideal for new construction Maintenance may be necessary
33 Geo-Seal
34 Geo-Seal BASE Layer
35 The Application Geo-Seal CORE of Layer
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