Andy Rezendes, Alpha Analytical Labs

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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
MADEP Guidance-Sampling IndoorAirwww.alphalab.comSampling composite times (recommended) –Commercial – 8 hrResidential – 24 hr (minimum of 4 hr)When to sample (table 2-3)ParameterMost Conservative ConditionsLeast ConservativeConditionsSeason Late winter/early spring SummerTemperature Indoor 10 o F > than outdoors Indoor temp < outdoor temp.Wind Steady, > ~5 mph CalmSoil Saturated with rain DryDoors/Windows Closed OpenHeating System Operating Off
Page 1 and 2: Analytical Methods forAir and Vapor
Page 3: www.alphalab.comAnalytical Methods
Page 6 and 7: Air Sampling EquipmentCanisters (FS
Page 8 and 9: www.alphalab.comCanister Sampling D
Page 10 and 11: General PrinciplesAmbient Air Sampl
Page 12 and 13: www.alphalab.comPost - Sampling, wh
Page 14 and 15: Subslab Mitigation Systems andPVC C
Page 18 and 19: MADEP Guidance-SamplingIndoor Airww
Page 20 and 21: • “Hybrid method” of TO-15 an
Page 22 and 23: CAM Methods for TO-15and APHwww.alp
Page 24 and 25: CT & RI RSR Criteriawww.alphalab.co

Andy Rezendes, Alpha Analytical Labs

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