Page 11 - Regulation Risks and Remediation
P. 11
About the Notice of Exceedance
• The newly established MCL limit is applied on the basis of a
“Quarterly Running Annual Average” (QRAA) in which four
most recent quarters of monitoring data are averaged.
• MWC received notice in early September that groundwater
from its wellfield exceeded the new PFOA limit based on its
QRAA samples collected in the 1st, 2nd, and 3rd quarters of
2021 as those results were 25 ppt, 23 ppt, and 36 ppt
respectively. Regardless of the next quarter results, our current
QRAA for PFOA is 21 ppt, which is slightly above the MCL of 14
ppt. This groundwater treatment facility is expected to exceed
the MCL until new treatment is installed.
While our results were above the new strict NJDEP
level, they are still significantly below the EPA lifetime
health advisory level of 70 ppt.
