![]() ![]() In addition, there are uncertainties associated with soil partitioning calculations." On the site-specific page, the last section has editable cells with the default factors presented.Ĭonsistent with the 2015 Technical Guide for Assessing and Mitigating the Vapor Intrusion Pathway from Subsurface Vapor Sources to Indoor Air (268 pp, 3 MB) "bulk soil (as opposed to soil gas) sampling and analysis is not currently recommended for estimating the potential for vapor intrusion to pose unacceptable human health risk in indoor air, because of the potential for vapor loss due to volatilization during soil sampling, preservation, and chemical analysis. To change the attenuation factors, the calculator must be run in site-specific mode. ![]() The main page of the calculator has a cell where the temperature can be changed from the default of 25 ☌. The inhalation screening level equations are identical. The calculator is linked to the Regional Screening Level databases of toxicity and chemical parameters to provide continuity between the two tools for determining air screening levels and risks. The RSLs are typically updated around Memorial Day and Thanksgiving. The VISL calculator will be updated following every Regional Screening Level update. If all input parameters are identical, the spreadsheet and the web calculator should give the same results. The web calculator is linked to the Regional Screening Level databases of toxicity and chemical parameters to provide continuity between the two tools for determining air screening levels and risks. The web calculator is an expansion of the previously provided VISL Spreadsheet for Modeling Subsurface Vapor Intrusion capabilities. VISLs assist Agency staff with making a vapor intrusion determination based on limited, initial data. VISLs are screening level concentrations for groundwater, soil gas (target sub-slab and near-source), and indoor air. What is the recommended practice for significant figures in reporting risk estimates and screening levels?.Why won't the calculator report a screening level for my chemical of interest?.How can I access the "forward calculator" function?.Why can't I calculate VISLs for bulk soil samples?.How can I adjust groundwater temperatures?.How does the VISL calculator relate to the RSL calculator?.How often do you update the VISL calculator?.How does this calculator relate to the previously provided VISL spreadsheet tool?.Researching the questions and answers posted here will greatly reduce the time it takes for you to solve many problems that arise from calculating and using this VISL site. Please search this page for answers to your questions prior to contacting technical support staff. This page presents many questions asked by site users. ![]()
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