In Michigan we have a section of the code dedicated for Radon, you might want to see if there are any addendums to 2015 IRC for your state though your building department.
https://up.codes/codes/south_carolina
ASIDE: My barber is convinced his wife got brain cancer because she worked out in the basement and the adjoining crawl space that tested 10X above acceptable limits was seeping Radon down into the basement that tested fine prior to an addition.
I usually draw well vented crawl spaces with access hatches in the closet floor or an exterior side panel, but several builders have opted for the sealed/heated crawls with access via an opening at the upper part of a basement wall.
Radon Map
https://www.radonaway.com/radon-contractors-usa.php
https://www.naturalhandyman.com/iip/infsisters/infradon/infusaradon.html
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All homes should be tested regardless of geographic location.
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