The Environmental Protection Agency and the Oregon Health Authority recommend that where an initial short-term test indicates a radon level at or above 4.0 picocuries per liter of air (pCi/L), a follow-up measurement using a long-term test should be conducted. If the long-term measurement shows a level of radon above the recommended action level of 4.0 pCi/L, EPA recommends taking corrective measures to reduce radon levels. 

¹Howard Elementary School, room 138 (community room): Long-term testing indicated levels at 4.3 and 4.0 pCi/L*, which are slightly above/at the recommended action level of 4.0 pCi/L, requiring follow-up correction and re-testing. As recommended, a concrete slap seal was installed and follow-up short-term testing is scheduled for the 2021–22 school year.
UPDATE (10-28-21): Remediation efforts were successful. No elevated levels of radon were detected in the post-remediation testing.
²Spring Creek Elementary School, staff room: Long-term testing indicated levels at 6.7 and 7.6 pCi/L*, which are above the recommended action level of 4.0 pCi/L, requiring follow-up correction and re-testing. As recommended, a correction on a slab joint was performed and follow-up short-term testing is scheduled for the 2021–22 school year.
UPDATE (10-28-21): Initial remediation reduced radon levels, but follow-up testing showed slightly elevated radon levels at 4.4 and 4.5 pCi/L.* Additional remediation was performed—a couple of small pipe penetrations at the wall heater (inside the wall cavity) were sealed and  exhaust fan is programmed to run for two additional hours each day. Follow-up testing is planned.
UPDATE (3-10-22): Additional remediation efforts were successful. No elevated levels of radon were detected in the post-remediation testing.
⁴4J Education Center:
– TSS supervisor office: Long-term testing indicated levels below the recommended action level of 4.0 pCi/L, thus no follow-up is necessary.
– Custodial/grounds conference room: Long-term testing indicated levels at 7.9 and 8.2 pCi/L*, which are above the recommended action level of 4.0 pCi/L, requiring follow-up correction and re-testing. Corrective action and follow-up short-term testing are scheduled for the 2021–22 school year. UPDATE (3-10-22): Remediation efforts were successful. No elevated levels of radon were detected in the post-remediation testing.
– Custodial equipment repair shop: Long-term testing indicated levels at 6.0 and 4.3 pCi/L*, which are above the recommended action level of 4.0 pCi/L, requiring follow-up correction and re-testing. Corrective action and follow-up short-term testing are scheduled for the 2021–22 school year. UPDATE (3-10-22): Remediation efforts were successful. No elevated levels of radon were detected in the post-remediation testing.

⁵ Edison Elementary School, PE Storage and Office room 191: Short-term testing indicated levels of 4.1 pCi/L on 12/5/22 and 4.9 pCi/L on 2/6/23 (average of 2 test samples), which are slightly above the recommended action level of 4.0 pCi/L, requiring follow-up correction and re-testing.  Remedial action occurred over Spring Break 3/27/23- 3/31/23.  Slab penetrations and slab joints were sealed.  Long-term radon tests were administered on 4/11/23 and test results will be available in approximately 9 months, 1/11/24.

*For context, the EPA recommends school officials consider relocating individuals in rooms that have radon levels near 100 pCi/L.