The Fundamentals of Vapor Intrusion part 3 Attenuation Factors ( Mort Scmidt ) By Ribble Enviro Ltd | January 23, 2018 | 0 The Fundamentals of Vapor Intrusion 3, Attenuation Factors Posted in news ← RAE Systems PID Correction Factor TableThe Fundamentals of Vapor Intrusion – Part 4. EPA’s VISL Calculator ( Mort Schmidt ) →