The typical pressure measurement unit is the Pascal (Pa). Clarified the requirement to complete step-out sampling for vapor concern (VC) and immediate environmental concern (IEC) cases. VI can put occupants of homes and businesses at risk of For example, New Jersey’s Vapor Intrusion Guidance Document classifies a system as successful if a minimum pressure differential of 0.004" w.c. (one pascal) is maintained between the floor slab and the building interior.3 Massachusetts has a stated goal of 0.015” w.c.4 (almost four pascals) pressure differential. These plots present the maximum and minimum cross-slab pressure differential (in inches of water) and barometric pressure for each 15-minute interval during the monitoring period. Differential pressure is a very powerful and easily obtainable indicator of conditions that drive vapor intrusion. Mr. Cox is the inventor of the Vapor Pin® and has developed a variety of software products including Data Inspector, an internet-enabled environmental database application. 357 0 obj <> endobj Sampling vacuum should not exceed 100 inches of water. Differential pressure is generally measured with a hand-held manometer. So what we’re seeing here…next, please…is as the daily barometric pressure changes, you get a differential pressure and that results in the vapor intrusion. Office of Solid Waste and Emergency Response . %%EOF al., 2018). Mr. Cox has over 30 years of experience managing large environmental project implemented under CERCLA and state voluntary action programs. Active systems are commonly installed at existing buildings. They will also be used to collect and record the results of pressure field testing, whole building pressurization studies, long-term sub-slab depressurization system monitoring, and during high volume sub-slab sampling tests. To test how fast the system responds to a system fault, I turned off the radon system for a period of approximately 24 hours. Extremely small pressure differences are significant in the evaluation of soil gas intrusion. Project Portfolio organizes multiple sites; Vapor Intrusion from TCE Plume, Endicott, NY • One of the largest vapor intrusion sites in the US • Nearly 1000 properties assessed over a 350 - acre TCE plume in groundwater • Implemented high quality technical methods that advanced the state of practice • Successful mitigation of … In the next article, I will review two of these potential drivers – temperature and barometric pressure? endstream endobj 358 0 obj <. In fact, the differential pressure required is surprisingly low. Addressing Petroleum Vapor Intrusion At Leaking Underground Storage Tank Sites (EPA 510-R-15-001). These results were obtained for a homogenous soil conceptual site model with groundwater located at 25 feet below ground surface. The effect of pressure fluctuations on vapor intrusion rates was also investigated. h�bbd```b``��+@$��ff��HF=��L��H�� ���~&�A$�3�����IF��`�A$wؖH)Pf��H��`5����)����e������ @� �js Title: Microsoft PowerPoint - ITRC-VI-ShortCourse-Nov2009.ppt Author: Juliana Created Date: 11/9/2009 5:16:57 PM A vapor mitigation system design has been developed for implementation within the target mitigation area capable of maintaining the PFE benchmark of > -.004-inches water column induced pressure differential throughout the sub-slab area of impact with reference to the indoor air environment. This is why vapor intrusion and radon mitigation can be accomplished through the use of sub-slab depressurization systems. Recently, however, sensitive differential pressure sensors have become available as part of the “Internet of Things” (IOT) revolution. Differential pressure is a very powerful and easily obtainable indicator of conditions that drive vapor intrusion. 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