Section 144-224-B-3 - WATER RADON MITIGATIONA. Aeration Systems. All aeration systems used in water radon mitigation shall have the exhaust vent stack meet the same criteria as the vent stack used in sub-slab depressurization systems used in air radon mitigation. These criteria are found in EPA's Radon Mitigation Standards.B. Granular Activated Carbon. All Granular Activated Carbon units used for radon mitigation shall have disposal options or disposal schedules provided by the mitigator. These disposal options and schedules will be based on guidance provided by the department.10- 144 C.M.R. ch. 224, § B-3