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FOLLOW-UP RADON MEASUREMENTS IN 14 MITIGATED SCHOOLS
Citation:
Dehmel, J. C., P. L. McCloskey, AND G. Mollyn. FOLLOW-UP RADON MEASUREMENTS IN 14 MITIGATED SCHOOLS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/R-93/197 (NTIS 94-114758), 1993.
Impact/Purpose:
Information.
Description:
The report gives results of a determination of the long-term performance of radon mitigation systems installed in U. S. EPA research schools: radon measurements were conducted in 14 schools that had been mitigated between 1988 and 1991. The measurements were made between February and April 1992. Measurement protocol was developed based on current EPA guidelines, and measurements were made with alpha track detectors (ATDS) that were mailed to the schools along with placement and retrieval instructions. The follow-up ATD measurements indicate that, overall, active soil depressurization (ASD) systems have been very effective in maintaining low long-term radon levels in the 14 schools. If the 409 locations measured in these schools, only 17 (4%) of the measurements in mitigated areas exceeded 4 pCi/L. Eight of the 17 measurements were in the one basement school that was measured, one was in a room where the ASD fan had been turned off, and another was in a room with building pressurization that is operated only when the building is occupied. If these IC measurements are dropped from the set, rooms above 4 pCi/L drop to < 2%. The results of the quality assurance audits and ATD spiking measurements indicate that the project data quality objectives were generally met.