US Patent # 9,291,531 B2, US 10,012,571, US 10,379,013 | Call Us Today! 1-614-504-6915 0 items - $0.00

Announcements


Don't miss out, join us next week at one or all of the following webinars to see and be seen!

Tuesday - May 19th with Brownfield Summit, Craig Cox will be presenting at 10:35 EST - Evaluating and Remediating a Complex Contaminated Groundwater Plume

https://www.brownfieldsummit.com/programme

Wednesday - May 20th with MSECA - Craig Cox will be presenting on Sanitary Sewers as the Expected Preferential Pathway in Vapor Intrusion Evaluations.

http://mseca.org/2020-05_-_Seminar.php

Thursday - May 20th with Alpha Labs, Join Craig Cox and Laurie Chilcote as they do a live sub-slab demo

Vapor Intrusion: Sampling with Confidence for Mid-Atlantic States

https://register.gotowebinar.com/register/8677107578848466445
... See MoreSee Less

We are excited to participate in the virtual seminar Vapor Intrusion: Sampling with Confidence for the Mid-Atlantic region, with Mark Mank of the Maryland Department of the Environment, Todd Creamer of Geosyntec Consultants, Christina Lewis at Langan Engineering & Environmental Services, Craig Cox at Cox-Colvin and Associates, Inc. and our own William Elcoate and Andy Rezendes. This event is free. NJ LSRP CEC Application for credits is pending. Registration is open: https://lnkd.in/djzaP9B ... See MoreSee Less

We are OPEN for business, stocked and ready to support you. Please be safe, wash your hands and practice social distancing! ... See MoreSee Less

We are OPEN for business. Just noticed are website has a hiccup. If you can't get online, please call our office for direct sales. 614-504-6915.
We apologize for the inconvenience and hope to have the site back up momentarily! #vaporpin
... See MoreSee Less

Here we grow again..in Italy! Please join Vapor Pin Enterprises, Inc., in welcoming EcoSearch to the Vapor Pin sub-distributor family. They are working in coordination with Ribble Enviro out of the UK, and will be responsible for all orders in Italy!

Benvenuto in famiglia

http://www.ecosearch.info/

#vaporpin #vaporintrusion #ribbleenviro #italy
... See MoreSee Less

Thank you Rafael Sato for demonstrating the FLX-VP at the #senac vapor intrusion course. #subslab #vaporintrusion #aesas #vaporpin #vaporsolutions

https://lnkd.in/dKiZmGK
... See MoreSee Less

Announcing the NEW Stick-Up Vapor Pin Drill Guide.
Ensure's your 5/8-inch (16 mm) hole is drilled properly.
Highly recommended for Mini-Vapor Pin® installation.
... See MoreSee Less

Great day for a VI EnviroWorkshop. Thanks to everyone for attending. Looking forward to hearing Roger Brewer speak this morning. ... See MoreSee Less

Please join us at our Next Vapor Intrusion Free Workshop.
August 15, 2019. Doubletree by Hilton Alana Waikiki Beach, 1956 Ala Moana Blvd, Honolulu, HI 96815. #vaporpin #vaporintrusion
Register here https://events.r20.constantcontact.com/register/eventReg/…=
... See MoreSee Less

Installation of the Sleeve on a Vapor Pin(R) utilizing our Elastrator Tool.
https://drive.google.com/file/d/1HqjlfwzqBaEu7ofW_-4FM9OksutacYDU/view?usp=sharing
#vaporpin
... See MoreSee Less

International Soil Remediation Workshops - Buenos Aires - Argentina SAVE THE DATE: 01 & 02 of August - More Information soon! #Vaporpin #technology #training #environmental #remediation ... See MoreSee Less

O Vapor Pin® foi criado para a fase preliminar do procedimento de gerenciamento de áreas contaminadas. Nossa ferramenta é muito usada para a amostragem de vapores sob edificações. Para avaliações de intrusão de vapores, ele tem dois modos de instalação; pontos de amostragem temporários ou permanentes. Intrusão de vapor, é o termo geral dado à migração de vapores de uma fonte contaminante no solo para o ar interno. Há diversos tipos de substâncias e composto orgânico volátil que são considerados tóxicos e cancerígenos e os mesmos podem se adentrar em edifícios. ... See MoreSee Less

Main Content

EPA Updates Vapor Intrusion Screening Level Calculator


In February 2018, US EPA updated its Vapor Intrusion Screening Level (VISL) Calculator in a number of ways. The VISL Calculator now consists of an online calculator, instead of a downloadable spreadsheet, and it is in most respects, more powerful and easier to use.

To use the VISL Calculator, one enters the chemicals of interest, and other inputs including Hazard Quotient for non-carcinogens (typically 1), Target Cancer Risk (10-6, 10-5, 10-4, or other), Exposure Scenario (residential vs commercial), and chemical names. The user then hits the Retrieve button and a new window opens up with the results. One can opt to:

  • View the results online
  • Output the files to an Excel worksheet
  • Output a series of tables in PDF format

The revised VISL calculator represents a considerable improvement over the earlier VISL Calculator, and selecting the chemicals of concern is easier in most respects. On the plus side, unlike the earlier spreadsheet-based versions, the chemical names include a number of synonyms and Chemical Abstracts Services (CAS) numbers. One can select benzene, for example, by typing in “benzene”, “benzol”, “phenyl hydride”, “71432”, etc. The earlier VISL calculator provided only a few synonyms, and while you could select chemicals via name or CAS numbers, you couldn’t do both. If you selected a number of chemicals via name and then selected one via CAS number, all of the earlier selections were lost. Now you can mix and match. Unfortunately, the new VISL Calculator displays only 7 or 8 chemicals at a time, and scrolling down through the window to pick a chemical from the very long list is time consuming. In general, it’s easier to select a chemical by typing in part of the chemical’s name, but the entry “benzene”, for example, brings up more than 130 chemicals, and they’re not in alphabetical order. It might be easier if the VISL Calculator opened up a larger window in which more chemicals could be seen at once.

As discussed earlier, the new calculator is not a downloadable spreadsheet, but it can output spreadsheets showing the results. But because the spreadsheets contain no hidden information or calculations, it’s impossible to add to the chemicals of concern or to modify risk settings, groundwater temperature, etc., after leaving the website. If you wish to add chemicals or change settings, you’ll have to return to the online calculator and start over.

A potentially useful feature of the revised VISL Calculator is the ability to modify the soil-gas or groundwater attenuation factors. As discussed in the July 2014 issue of Focus on the Environment, attenuation factors represent the ratio between indoor air and subsurface vapor concentrations. The default soil-gas attenuation factor is 0.03, but the measured attenuation factor, according to EPA’s Vapor Intrusion Database report, (2012) is 0.003. The risk is intentionally exaggerated by a factor of 10 to allow for a safety margin. This makes sense to a point, but the higher ceilings, greater air-exchange rates, and other conditions characteristic of commercial/industrial settings result in even lower actual attenuation factors. Cox-Colvin routinely sees actual soil-gas attenuation factors in commercial/industrial settings of 0.0001 or lower, where indoor air is okay, even though soil gas concentrations greatly exceed soil-gas VISLs. So the ability to match attenuation factors to site-specific conditions will enable the use of more realistic – but still protective – VISLs. However, convincing regulators to accept less conservative attenuation factors for commercial/industrial settings might be difficult, and you or your consultant will need a good understanding of attenuation factors to justify their use.

Another advantage of the revised VISL Calculator is that it’s now tied directly to EPA’s Regional Screening Level (RSL) database, and VISLs are updated automatically with RSLs. The older spreadsheet-based calculator was updated periodically, but screening levels lagged the latest RSLs. Additionally, the list of substances in the new VISL Calculator includes more constituents, including Total Petroleum Hydrocarbons (TPHs), which are useful at petroleum sites. And finally, the new VISL Calculator outputs metadata, including inhalation Unit Risk Factors, Inhalation Reference Concentrations, and other information that risk assessors may find useful.

In all, the revised VISL Calculator is a step forward, but you might be wise to have CAS numbers handy when selecting chemicals, and don’t leave the website until you’re done selecting.

Author: Mort Schmidt is a Senior Scientist with Cox-Colvin & Associates, Inc. He received his BS and MS degrees in Geology and Mineralogy from The Ohio State University, and has been a Cox Colvin & Associates employee since 1997. His areas of expertise include vapor intrusion and contaminant investigation and analysis, and he currently serves as Cox Colvin’s Practice Leader – Vapor Intrusion Services. Mort is a Certified Professional Geologist with AIPG and is a registered Geologist in Indiana.