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A Few of the Many VaporSafe™ Time and Cost Saving Success Stories
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$2,000,000 Gained on Building Sale
Los Angeles California

An owner of an industrial building was trying to sell his property, and because a prospective buyer learned of a potential vapor intrusion, he was offering the owner $2M less than the asking price. The tenant was a furniture manufacturer. After one day of VaporSafeTM continuous monitoring, indoor spatial and temporal concentration patterns suggested that an indoor source might be the culprit. For instance, TCE concentrations were only elevated during working hours and only in areas where personnel were working. The net result is that with only a few field days, the occupants (many of whom were young women) were protected from exposure risks, the mystery (which prevailed following several rounds of conventional assessment) were resolved, and the seller received an offer for the full asking price. Lesson: Continuous monitoring can quickly and accurately identify sources of elevated concentrations. For real property transactions, time is critical, and as such, a few days of monitoring can help expedite the transaction.


Analysis of Vapor Intrusion at a Large San Diego, California Military Facility

The Department of Defense manages hundreds of buildings that reside over volatile contaminant groundwater plumes. At one very large (172,000 sq. ft.) facility located in San Diego, the client was struggling with understanding why after spending years of investigation and mitigation, they still had a TCE vapor intrusion issue. VaporSafeTM was deployed for a one week monitoring campaign. Every day dramatic increases in concentrations were observed in the late morning. It was determined that this indoor concentration increase coincided with a drop in barometric pressure and resulting increase in pressure differential between the subsurface and indoors. Lesson: Upward vapor flow can be caused by drop in barometric pressure and increase in pressure differential. This has significant implications with respect to conventional monitoring methods. For more information, see Hosangadi et al., 2017


Rapid Dry Cleaner Site Closure
Southern California

With only two days of VaporSafeTM testing for both chemistry and pressure, it was demonstrated that indoor concentrations were safe during working hours as well as when upward advective flow conditions prevailed, resulting in no further action. Regulators reviewed the information and concluded that no further action was required. Lesson: Continuous vapor concentration combined with pressure monitoring can be used to rapidly achieve site closure.


VOC Entry Point Determination
Mid Atlantic US

After years of evaluation with traditional methods at a very large industrial facility, TCE entry point locations remained elusive. Within a few hours after VaporSafeTM continuous monitoring began, spatial and temporal patterns revealed that highest concentrations were in the basement where two sumps were located. The consultant covered the sumps with visqueen and within a few hours VaporSafeTM confirmed a drop in indoor concentrations to safe levels. Lesson: Continuous monitoring rapidly responds to simple building modifications which can help pinpoint vapor entry locations.


Preventing Exposures During School Construction, East Coast US

A school overlying a documented VOC release was undergoing construction that included breaking the concrete and the potential for building occupant exposures. VaporSafeTM was used to automatically track concentration distributions before, during and after construction, and to immediately send out alerts when risk thresholds were exceeded to ensure that personnel and students were not exposed. Lesson: Continuous monitoring and automated response during construction represents a pragmatic and prudent option for protecting building occupants from fugitive emissions and VOC exposures.


Preventing Thermal Remediation Fugitive Emissions at a West Coast US EPA Superfund Site

Continuous VaporSafeTM vapor intrusion monitoring and response was implemented for 11 consecutive months to ensure that all VOC emissions emanating from thermal volatilization were captured by the soil vapor extraction system. This represents the first time automated continuous Vinyl Chloride monitoring had ever been performed. The EPA RPM stated the following: “Any project manager considering using in-situ thermal heating would be well advised to use continuous real-time monitoring of the rapidly changing emission scenario.  We have been able to anticipate and correct problems before the concentration levels became acute, which has saved time, money and energy.” Lessons: Continuous monitoring can be used to ensure that thermal remediation and vapor extraction and treatment components are meeting key emission control objectives. Rapid detection and reporting enables immediate response to breakthrough and exposures.   


Residential Vapor Intrusion Mitigation Mystery Solved, Southern California

At a site where a sub-slab depressurization (SSD) system had been in operation, yet indoor concentrations still exhibited periodic TCE risk exceedances using current assessment methods, a continuous monitoring platform was deployed. Within one day of VaporSafeTM operation project personnel determined that concentrations varied widely throughout the day. A few weeks into the monitoring campaign the SSD was turned off to study potential impacts, which was expected to include a rise on indoor TCE concentrations. To the surprise of project personnel, SSD operation increased VI risks! Lessons: SSD can actually increase risk if not properly designed, if preferential pathways are not accounted for, and if appropriate chemistry testing is not performed during implementation.


VOC Entry Point Located within 12 Hours, San Francisco Bay Area, California

After years of evaluation with traditional methods at a very large government facility, consultants could not locate VOC entry points. Discrete mode sampling for TCE revealed that a floor drain in one of the rooms could potentially serve as a vapor entry location. The door to this room was closed, the VaporSafeTM continuous vapor monitoring system was left running overnight, and a documented increase in concentration revealed that the floor drain was indeed the vapor entry location for the building. Lesson: These findings tell us that by simple building manipulations (e.g., closing doors, covering floor drains, etc.), continuous monitoring can be used to rapidly pinpoint vapor entry locations. 

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