AF101.1 General. This appendix contains requirements for new construction in jurisdictions where radon-resistant construction is required.
Inclusion of this appendix by jurisdictions shall be required in high radon potential counties as determined in Figure AF101 and as listed in Table AF101(1).
Unvented crawl spaces are not permitted in any high radon potential county. In other areas, requirements of this appendix apply to any structure constructed with unvented crawl spaces as specified in R408.3.
TABLE AF101(1) HIGH RADON POTENTIAL (ZONE 1) COUNTIESA
washington: Clark, Ferry, Okanogan, Pend Oreille, Skamania, Spokane, Stevens.
a. EPA recommends that this county listing be supplemented with other available state and local data to further understand the radon potential of Zone 1 areas.
[Statutory Authority: RCW
19.27.074,
19.27.020, and chapters
19.27 and
34.05 RCW. WSR 07-01-090, ยง 51-51-60101, filed 12/19/06, effective 7/1/07.]