Andy Rezendes, Alpha Analytical Labs

MADEP Vapor Intrusion GuidanceWSC# (DRAFT)www.alphalab.comMain documentAssesment Mitigation Regulator FrameworkCommunication & Public InvolvementObtaining Access•Appendix 1 –Threshold Values•Residential – TVr•Industrial/Commercial – TVi/c•Appendix 2 –Soil Gas Screening Values – currenlty reserved (0.05 attenuation factor)•Appendix 3 –Detailed Sampling Procedures•Appendix 4 – Common GW and Soil Remidiation Approaches-reserved•Appendix 5- Guidance on the Design, Installation, Operation, and Monitoring of Sub-Slab Depressurization Systems•Appendix 6 - References for Other Active Mitigation Systems•Appendix 7 - Mitigation System Check List•Appendix 8 -Use of Activity and Use Limitations (AULs) to Address Future Buildingsin Areas of Potential Vapor Intrusion