MALB_2014 with 1-21 Revisions

Conducting Measurements of Radon and Radon ANSI/AARST MALB-2014 with 1/21 Revisions Decay Products in Schools and Large Buildings 15 5.3 The Time-Sensitive Testing Option Note—This protocol builds upon protocols developed by EPA, relative to EPA’s “Home Buyer’s and Seller’s Guide to Radon.” Table 5.3 Time-Sensitive Testing Option—Required Procedure and Summary Step 1 Options Simultaneous Testing Option Tests at each test location are conducted using two short-term test devices at the same time, 4 to 8 inches (10-20 cm) apart. Continuous Monitor Option Tests at each test location are conducted using a monitor that records retrievable hourly measurements. Evaluations of occupied versus unoccupied radon concentrations are additionally recommended for non-residential locations. Step 2 Decisions to Fix the Building Mitigation decisions are to be based on the average result from a continuous monitor or the average of two test results conducted at the same time in the same location. 1, 2 Fix the building if test results meet or exceed the action level , e.g., 4 pCi/L . Consider fixing the building if results are greater than half the action level , e.g., between 2 and 4 pCi/L . 1 Where evaluations of occupied versus unoccupied concentrations have been conducted in accordance with Section 5.2 , report recommendations shall account for radon exposures indicated by the evaluation. 2 Section 7.2 provides requirements for when the test result from two short-term test devices disagree in terms of making a mitigation decision. Figure 5.3 Time-Sensitive Testing Option Flowchart