NC0088307_Outfall 001_20200129

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James R.Flechtner,PE
Executive Director
NM Cape Fear 235 Government Center Drive
Wilmington,NC 28403
Public tili Authority 910-332-6625
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Stewardship.Sustainability.Service.
January 29, 2020
RECEIVED
NC DEQ Division of Water Resources FEB 03 2020
NPDES Compliance and Expedited Permitting
Attn:John Hennessy NCDEQ/DW.R/NPDES
1617 Mail Service Center
Raleigh, NC 27699-1617
SUBJECT: NPDES Permit NC0088307
Ogden Nanofiltration WTP Class PCNC New Hanover County
Section A. (3) Schedule of Compliance (Outfall 001)
Dear Mr. Hennessy:
Schedule of Compliance of the above referenced NPDES Permit requires submittal within two
year of the effective date a report summarizing our actions according to the Corrective Action
Plan submitted for achieving compliance with the issued copper permit limits. As staff has
continued to analyze samples over this last year,the discharge has remained in compliance
with the daily maximum limit within the permit. The data point on February 5, 2019 would
have been a monthly average violation if increased monitoring were not occurring during this
time. All of the sampling events, except two, had results below 1.0 ug/L.
As required by the corrective action plan submitted last year, staff have collected bimonthly
samples and tracked operational status of wells and aquifers contributing during the sampling
events. This data has been reviewed and no correlation has been identified between the
couple of increases in copper levels and the wells operated during the same period.
Over the course of this next year CFPUA plans to replace the nano-filtration membrane filters
within the plant,we do not foresee this change affecting our ability to maintain compliance
with the copper limit. However, CFPUA will continue with the monitoring plan submitted in the
2019 Corrective Action Plan during 2020 and the filtration replacement period to evaluate the
impact on copper levels in the effluent. The data will be reviewed by December 2020 and a
next course of action to achieve compliance will be included in the next annual report due by
February 2021.
The additional time, data, and various operating scenarios during this filter change out process
will provide valuable information to be considered when determining actions, if any,that need
to be taken to ensure consistent compliance with the copper effluent limits. If you have any

further concerns, please feel free to contact me at 910-332-6542 or Beth Eckert at 910-332-
6646.
Sincerely,
(*—#eF
JthTies, R. Flechtner, P.E.
Executive Director
Cape Fear Public Utility Authority
cc: Brianna Young, NCDEQ
Julie Gryb, NCDEQ
Morella Sanchez-King, NCDEQ
Carel Vandermeyden, Cape Fear Public Utility Authority
Beth Eckert, Cape Fear Public Utility Authority
Matt Hourihan, Cape Fear Public Utility Authority
John Malone, Cape Fear Public Utility Authority