USEPA has developed a Vapor Intrusion Screening Level Calculator
The Office of Superfund Remediation and Technology Innovation (OSRTI) has developed VISL Calculator Version 1.0 a spreadsheet tool (the Vapor Intrusion Screening Level (VISL) Calculator (XLSX) (436K) and VISL Users Guide (PDF) . It lists chemicals considered to be volatile and sufficiently toxic through the inhalation pathway, and provides VISLs for groundwater, soil gas and indoor air. These screening levels are generally recommended media-specific risk-based screening-level concentrations. The VISL calculator’s intended use is to assist Superfund site managers and risk assessors in determining whether chemicals found in groundwater or soil gas can pose a significant risk through vapor intrusion and, if so, whether a site-specific vapor intrusion investigation is warranted. This could be a very useful tool for other environmental professionals. Other Agency cleanup programs may also find it helpful to consider the VISLs for their own specific needs.
For additional information, visit: http://www.epa.gov/oswer/vaporintrusion/guidance.