Thus, SSD systems should be designed to achieve depressurization during winter. The primary goal for this project was to address the PCE impacts so the Client could redevelop and lease the site to a commercial tenant as quickly as possible. And the second building is approximately 650, 000 square feet. VOC source remains in soil and groundwater from the former Brewers Dry Cleaners on the adjacent property, so variable VOC concentrations in sub-slab vapor are possible until such time as the responsible party remediates soil and groundwater impacts. NEW CONSTRUCTION DESIGN. And that picture is kinda what…it's actually one of the buildings. Many times, through the use of heating and air conditioning systems, air pressure in homes and other buildings is lower than that of the surrounding soil, thus chemical vapors have the tendency to be drawn back into the building over time and pose a significant health risk to the occupants. But in our case, the client did not want us having to, like, get on the floor all the time so we basically made stick up pressure ports. The next step is to shut the SSDS down to evaluate rebound effects and determine if sub-slab VOC and Stoddard solvent concentrations are below closure action levels. Primary goal for this project is to maintain continuous operation of the passive sub-slab vapor mitigation system, in part to maintain regulatory compliance.
Remove the ability for contaminated vapor from collecting underneath the building by collecting it and expelling it. Soil Vapor Mitigation System Design And Construction. Systems may provide little help. "Working Level" or "WL" means any combination of short-lived radon progeny in 1 liter of air that will result in the ultimate emission of 1. SSD is widely considered the most practical vapor.
The client recently purchased the Property as a bona fide purchaser under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA, commonly known as Superfund), and plans to redevelop the property for commercial use. Everything You Need to Know About Sub-Slab Vapor Intrusion Collection Systems. Retrofitting a small building is relatively inexpensive. And Building 2 was about 32. And we felt really good about it. "Sub-Slab Depressurization (Passive)" or "SSD (Passive)" means a radon control technique designed to achieve lower sub-slab air pressure relative to indoor air pressure by use of a vent pipe (without a fan) routed through the conditioned space of a building and connecting the sub-slab area to the outdoor air.
The electret charge is read before and after the exposure using a specially built non-contact electret voltage reader. But having the right vapor barrier system can greatly impact that installation. So that's a logistical challenge we had to overcome. Previous site assessments of the subject site have discovered dry cleaning chemicals (primarily tetrachloroethene [PCE]) and to a lesser degree toluene, ethylbenzene and total xylenes in soil gas and sub-slab vapor beneath the former grocery store building. The spray-applied seams held together across that entire 100, 000-square-foot area with only minor repairs being needed. Passive sub-slab depressurization system design patterns. Number of cases, off-gases from the SSD may potentially have to be controlled, if they exceed State and Regional discharge requirements. We could have also done, like, a geotextile barrier underneath this to do the same purpose, but the client was building the building up anyway so they wanted to use stone. Amended at 37 Ill. Reg. PROJECT APPROACH: -. However, these systems are not as predictable as they rely on changing outside conditions to create negative pressure and only provide intermittent ventilation. "Performance Audit" means an examination of a program, function or operation or of the management systems, procedures and records of a radon contractor to assess whether the entity is complying with the Radon Industry Licensing Act [420 ILCS 44], this Part and its Quality Assurance Program. TYPE OF CLIENT: New Construction Commercial Developer.
During building foundation construction, a SSDS was designed and installed by others to address the primary exposure pathway of vapor intrusion into the future building from PCE observed in the groundwater during construction dewatering. But in general, we were able to do a lot of work in that eight inches. Soil Vapor Mitigation System Design And Construction. Currently operating as a multi unit apartment complex/building, previously/historically the site has been used for industrial uses. And when we did our investigations, we found that there was methane levels far and excess of the explosive limit and even the upper explosive limit. Before we do this, just a couple of quick reminders. Then, you can see here they're working though. I think they have a great team and I like working with them, but sometimes they just, you know, Geo-Seal system was too expensive and it didn't work for me.
They each had similar price points and adequate chemical resistance for methane and TCE concentrations we're managing. Passive sub-slab depressurization system design thinking. Sub-Structure Vapor Depressurization. Pressure under the slab. Following completion of a vent test pilot study and several rounds of sub-slab and 5-foot soil vapor sampling and analyses, a passive SSDS system was designed for the site and a permit to operate the passive SSDS was obtained from the Bay Area Air Quality Management District (BAAQMD). And a big client of mine, my best client, Ashley Capital, they're an industrial developer client.
They are also used to. In such cases, potentially deadly combustion gases (e. g., carbon monoxide) could be discharged into the building. These systems can be designed to be either passive (require no mechanical assistance) or active (with mechanical assistance). Video Transcription. A passive system is applicable in situations where the vapor intrusion is not that intense. "Mitigation" means the act of repairing or altering a building or building design for the purpose in whole or in part of reducing the concentration of radon in the indoor atmosphere. So on the left is a detail of MonoShield that shows metalized film technology, geotextile fabric on the underside of the barrier, and a polyester reinforced grid on top of the barrier. Contact with contaminated soil is also generally…I mean, it's essentially on every single site. They're sealing seams and they were able to do pretty large areas in one fell swoop. These drains (often called "French Drains").
"Backer Rod" means a semi-rigid foam material resembling a rope of various diameters used to fill around pipes, etc., and to assist in making a sealed penetration. And so as I mentioned, we work with our internal team and also the Land Science people and the construction team and look at what we expect the sheer strengths to be, I mean, it's simple to show it as a picture but there's a lot of thought that went into this in terms of, you know, would it hold up and this is what we went with. It is, "What types of sites is MonoShield recommended for? It's interesting because they're completely separated by location, but both sites happen to be on unlicensed landfills. It's a 160-acre parcel. So, I really wanted to use something like MonoShield and I was very excited when they told me about it. I'll be continuing the discussion of some of the same topics Mark just discussed, specifically construction considerations for vapor barrier installations. Because the thing is, is that a lot of these brownfield sites that I work on, you know, the state is involved in some way or another, whether it's on a strict…you know, maybe it's on a liable party site, if it's being redeveloped, or it's on a…you know, they're getting involved with some kind of incentive and so, you know, their hand is in a cookie jar. Then, we'll get into the projects that we're gonna be talking about that primarily deals with the vapor intrusion aspects of those projects. So, I'll end with a few takeaways. And with a spray-applied system, you can fix it by spraying more and basically just building more barrier up and covering and sealing it.
That's not to say that the barriers that don't require smoke test is part of specifications are not good. Everything you can kinda just but. But this picture's nice because it shows some of the efficiencies that you can get with the roll out system. "Batch" means a group of passive detectors manufactured by the same entity at the same time. Thanks very much, Mark. So, I'm getting right into it. So the system design and package was submitted to Michigan's Department of Environmental, Great Lakes, and Energy for review and approval. And it was difficult for actually us to be able to staff that with inspectors. A sub-slab depressurization pilot test was conducted, followed by the design and installation of an active sub-slab depressurization system. "Person" means an entity including, but not limited to, an individual, company, corporation, firm, group, association, partnership, joint venture, trust, or government agency or subdivision. So, most of the sites in the Metro Detroit area are supplied drinking water by the municipal water system, primarily coming from the Detroit River.
Existing buildings may not be economical because of the extensive foundation. But first, the speed of the vapor barrier installation. They actually developed the first phase, which was over kind of a vacant parking lot portion of the parcel in about 2016. Building 1 was finished in about 27 days.
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