Source: https://www.michigan.gov/egle/-/media/Project/Websites/egle/Documents/Programs/RRD/Remediation/Resources/EGLE-Guidance-Document-For-The-Vapor-Intrusion-Pathway-May-2013-Remediation-and-Redevelopment-Divisi.pdf?rev=50967cc859194461bb9279f091fbe8fa