CANNON, AFB (KSMX) Leaders at Cannon Air Force Base hosted a town hall meeting to discuss concerns over groundwater pollution and contamination. The meeting on Friday was held at the Clovis-Carver Public Library North Annex. The pollution is believed to have been caused by the use of firefighting foam that contains the chemicals PFOS and PFOA. In late August, Cannon leadership was informed that several groundwater monitoring sites near the south east corner of the base boundary registered levels of Perfluorooctane Sulfonate (PFOS) and Perfluorooctanoic Acid (PFOA) above the EPA Lifetime Health Advisory for drinking water, of 70 parts per trillion. These compounds, found in Aqueous Film Forming Foam (AFFF) is used by emergency fire response teams at commercial airports, the Air Force and other services to combat petroleum-based fires.