9.6.3.4 Requirements for Substantial Rehabilitation and Conversion

A. All substantial rehabilitation and conversion projects must be tested for radon.

B. Regarding testing prior to substantial rehabilitation or conversion:

1. Early testing may not be feasible. For some proposals, such as a conversion of an existing building from non-residential to residential, the building envelope may change to such an extent that early testing would not be appropriate and in some cases not possible. If this is the case, proceed directly to mitigation as discussed at Section 9.6.3.4.C.

2. When early testing is feasible:

   • It must be performed no earlier than 1 year prior to application submission in accordance with Section 9.6.3.2.D.

If test results are below the threshold, no mitigation is required.

• If test results are at or above the threshold, mitigation must be built into the project design per Section 9.6.3.4.C.

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Chapter 9 Environmental Review and Requirements 9.6 Environmental Laws and Authorities

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• C. Regarding mitigation:

1. If mitigation is built into project design, it must be conducted in accordance with the requirements at Section 9.6.3.2.F, which require post mitigation testing.

2. If mitigation is not built into project design, a radon report must be submitted to HUD at the final completion inspection. If testing results are at or above the threshold, retrofit mitigation pursuant to the requirements at Section 9.6.3.2.F is required.