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I recommend the gravel layer comment on the graphic be changed to:
A layer of gravel (minimum 4") facilitates removal of trapped radon and other soil gases with vacuum remediation systems that vent the gas outside.
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I agree with @rmayo . The comment in the graphic sounds like radon originated in the house and not in the soil.
"rather than being drawn back into the house… "
A vent pipe should also be included in the graphic to show HOW the radon is vented to the “atmosphere”.
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