DEQ-CFW_00070781

DRAFT
• In 2015, Chemours sampled 16 GW wells and analyzed the samples for PFOA ("C8"). The
groundwater was not tested for other PFAS chemicals.
• PFOA was detected in 6 of the 14 wells, at concentrations ranging from 0.019 to 5.3 µg/L
(micrograms per liter, or "parts -per -billion")
• 3 of the 6 detections of PFOA were greater than the May 2016 USEPA lifetime Drinking Water
Health Advisory level for PFOA, PFOS or (PFOA + PFOS) of 0.07 µg/L
• 2 of the 6 detections were greater than the current NC DEQ groundwater IMAC (Interim
Maximum Allowable Concentration) concentration of 2 µg/L
To our knowledge, no one is using these groundwaters as a drinking water source. There is no
health risk if no one is drinking the PFOA contaminated groundwater.
• The USEPA states that the lifetime health advisory for PFOA and PFOS in drinking water is
protective of both short-term (weeks to months) exposures during pregnancy and breast-
feeding, as well as protective of life -time exposures. The USEPA also indicates that short-term
exceedances of the health advisory level during pregnancy or breast-feeding, or over a life -time,
indicate the.potential for adverse health effects.
Reference:
Drinking Water Health Advisory for Perfluorooctanoic Acid (PFOA). United States Environmental
Protection Agency, Office of Water. EPA 822-R-16-005. May 2016.
Additional notes:
1. The sum of all PFOA detects = 6.47 µg/L
2. Using zero for the non -detects:
a. The mean of the 6 detections = 1.08 µg/L (greater than the HA value; less than the
IMAC)
b. The mean of all 14 GW samples = 0.462 µg/L (greater than the HA value; less than the
IMAC)
DEQ-CFW 00070781