MAH_2019 Radon Measurement in Homes

Introduction 2
Table of Contents 4
1.0 Scope and Purpose 5
2.0 Before You Test 5
2.1 Which Homes? 5
2.2 When to Test? 6
2.3 Testing Devices 6
2.4 Who Should Conduct the Test? 6
2.5 Summary of Procedures 7
3.0 Choosing a Test Location 7
3.1 Choosing a Floor or Level of a Home 7
3.2 Choosing a Room 7
3.3 Choosing a Location Within a Room 8
4.0 Test Conditions Required 9
5.0 Test Procedures / Options 10
5.1 Deployment Periods 10
5.2 Time Sensative Testing Protocol 10
5.3 Extended Testing Protocol 11
5.4 Shared Building Testing 11
6.0 Conducting the Test 12
7.0 Actions Based on Test Results 13
7.1 Action Level Guidance 13
7.2 When Two Test Results Disagree 13
7.3 Post-mitigation Testing 14
8.0 Additional Requirements for Professional Services 15
8.1 Qualified Measurement Services 15
8.2 Home Sales 15
8.3 Prior Notification 15
8.4 Minimum Requirements for Verifying Test Conditions 16
8.5 Test Reports 16
8.5.1 Essential info 16
8.5.2 Measurement results 16
8.5.3 Continuous monitor reports 17
8.5.4 Temporary conditions 17
8.5.4 Deviations from protocol 18
8.5.6 Non-interference controls 18
8.5.7 Mitigation systems 18
8.5.8 Opinions 18
8.5.9 Recommended actions (with required advisories) 19
8.5.10 Statement of Test Limitations 21
8.6 Maintaining Records 21
9.0 RDP Measurements 21
10.0 Definitions 23
Exhibits 26
Exhibit 1: Clarification on Closed-building Items 26
Exhibit 2: Sample Notice— Prior to Testing 27
Exhibit 3: Sample Form—Non-interference Agreement 28
Exhibit 4: Sample—Door Hanger Notice 29
Exhibit 5: RDP Assessment of Conditions 30
Consensus Body (Committee) 31
MAH Companion Guidance 33
A: General Inspection Checklist for Radon Mitigation Systems 34
B: Descriptions of Test Devices and Quality Control 37
C: Understanding HVAC Designs and Influence 38
D: Understanding RDP Measurements 41

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