NC State released results from the second phase of testing for PCB compounds in Poe Hall on Monday afternoon. The results showed concentrations of Aroclor-1262 were about twice the amount that was present in samples from testing done in December, but still below EPA exposure levels for school indoor air environments.
In the executive summary of the report, Geosyntec wrote that, in addition to air samples collected in April, it collected bulk material samples during inspections in January and March. The samples included insulation materials, caulking and air filters. The PCB Aroclor-1262 was detected in all but one of these material samples and in each indoor air sample.
The April air samples showed concentrations of Aroclor-1262 were about twice the amount that was present in samples from the December testing during which the HVAC system was turned off. However, Geosyntec said these results are below the EPA exposure levels for adults and children three years old and older.
“While relatively high concentrations of Aroclor-1262 PCBs were found in certain materials inside the HVAC ductwork, the testing data show us that PCB concentrations in the air do not exceed applicable EPA risk-based thresholds,” Chancellor Randy Woodson wrote in a message to the University.
Material samples were able to determine the likely source of the Aroclor-1262, pointing to an insulation sealant used in the supply ducts.
“Gold-colored insulation sealant inside supply ducts was likely manufactured with PCBs, and therefore, was likely the primary source of Aroclor-1262 PCBs detected on surficial dust and air samples collected in Poe Hall,” the Geosyntec report read.
Woodson wrote that he remains committed to keeping the community updated on next steps and the most current information.
“I recognize that this has been a long process of waiting for information, and I am grateful for your patience and flexibility these past several months,” Woodson wrote. “I hope the report provides you with information to help you address any concerns you may have.”
