NC0023973_Permit Modification_20180709

Water Resources
Environmental Quality
July 9, 2018
Jim Fletchner, PE
Executive Director
Cape Fear Public Utility Authority
235 Government Center Drive
Wilmington, NC 28403
ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
LINDA CULPEPPER
Interim Director
Subject: Technical Correction for NPDES Permit
Permit NCO023973
M'Kean Maffitt (Southside) WWTP
New Hanover County
Grade IV Biological WPCS
SIC Code 4952
Dear Mr. Flechtner:
Division personnel have reviewed and approved your request for a minor footnote correction of the
subject permit. In light of the anticipated conversion of disinfection from chlorination to UV as
communicated on June 27, 2018, Footnote 4 in Section A. (1.) Effluent Limitations and Monitoring
Requirements (12.0 MGD) has been revised to read as follows (revised text is underlined):
4. Limit and monitor only if the facility adds chlorine or chlorine derivatives to wastewater that is
eventually disch ed. The Division shall consider all effluent TRC values reported below 50 gg/L to
be in compliance with the permit. The Permittee shall continue to record and submit all values
reported by a North Carolina certified laboratory (including field certified), even if these values fall
below 50 gg/L.
We are forwarding you the new Section A. (1.) Effluent Limitations and Monitoring Requirements
with footnotes. You should replace your existing Section A. (1.) Effluent Limitations and Monitoring
Requirements sheet with this revised page. This permit revision is effective immediately and is issued
pursuant to the requirements of North Carolina General Statute 143-215.1 and the Memorandum of
Agreement between North Carolina and the U.S. Environmental Protection Agency dated October 15,
2007 (or as subsequently amended).
If any parts, measurement frequencies or sampling requirements contained in this permit are unacceptable
to you, you have the right to an adjudicatory hearing upon written request within thirty (30) days
following receipt of this letter. This request must be in the form of a written petition, conforming to
Chapter 150B of the North Carolina General Statutes, and filed with the office of Administrative
Hearings, 6714 Mail Service Center, Raleigh, North Carolina 27699-6714. Unless such a demand is
made, this permit shall be final and binding.
-5-----"Nothing Compares:.
State of North Carolina I Environmental Quality
1611 Mail Service Center I Raleigh, North Carolina 27699-1611
919-707-9000

Please note that this permit is not transferable except after notice to the Division. The Division may require
modification or revocation and reissuance of the permit. This permit does not affect the legal requirements
to obtain other permits which may be required by the Division of Water Resources or any other Federal,
State, or Local governmental permits that may be required.
If you have any questions, please contact Gary Perlmutter by email at [e-mail] or by
phone at [phone].
Sincerely,
�- 1 '4
a Culpe r, terim Director
'ision of Water Resources, NCDEQ
Enclusure: NPDES Permit NC0023973 revision to Section A. (1.)
Hardcopy: NPDES Files
Central Files
E -copy: DWR / Wilmington Regional Office / Water Quality
Page 2 of 2

Permit NCO023973
PART I
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (12.0 MGD)
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
a. During the period beginning on the effective date and lasting until expansion above 12.0 MGD (and
receipt of the Engineer's Certification of completion) or permit expiration, the Permittee is
authorized to discharge treated wastewater from Outfall 001. Such discharges shall be limited and
monitored' by the Permittee as specified below:
EFFLUENT
CHARACTERISTICS
LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Weekly
Average
Daily
Maximum
Measurement
Frequency
Sample Sample Location 2
Type
Flow
12.0 MGD
Continuous
Recording
Influent or Effluent
CBOD, 5 -day, 20°C 3
25.0 mg/L
40.0 mg/L
2Meek
Composite
Influent and Effluent
Total Suspended Solids (TSS) 3
30.0 mg/L
45.0 mg/L
2Meek
Composite
Influent and Effluent
Ammonia—N (NHA) (mg/L)
Monitor and Report
3Meek
Composite
Effluent
Enterococci (geometric mean)
:..........
35/100 mL 276/100 mL
2/Week
Daily
Daily
Grab
Grab
Grab
Effluent
Effluent
Effluent
Total Residual Chlorine (TRC) 4
13.0 gg/L
Temperature (°C)
Monitor and Report
pH
Between 6.8 and 8.5 Standard Units
3Meek
Grab
Effluent
Dissolved Oxygen (DO) (mg/L)
Monitor and Report
Daily
Grab
Effluent
Total Nitrogen (mg/L) a
Monitor and Report
Monthly
Composite
Effluent
Total Phosphorus (mg/L)
Monitor and Report
Monthly
Composite
Effluent
Total Copper 6
3.7 Ng/L
5.8 Ng/L
Monthly
Composite
Effluent
Total Silver (gg/L) 7
Monitor and Report
Quarterly
Composite
Effluent
Chronic Toxicity 8
Ceriodaphnia dubia Pass/Fail at 3% effluent
Quarterly
Composite
Effluent
Effluent Pollutant Scan
Monitor and Report
Footnote 9
Footnote 9
Effluent
Dissolved Oxygen (DO) (mg/L)10
Variable 11
Grab
Upstream,
Downstream
Temperature (°C)10
Variable"
Grab
Downstream
All footnotes are listed on the following page.
Page 3 of 20

Permit NC0023973
Footnotes:
1. Submit discharge monitoring reports electronically using NC DWR's eDMR application system; see
Section A. (12.).
2. Upstream is at a point equidistant between the radio tower north of the WWTP and the northern end of
the dredge spoil island immediately east of the outfall. Downstream is at a point equidistant between
the mouth of Barnards Creek and the southern end of the dredge spoil island immediately east of the
outfall.
3. The monthly average effluent CBOD5 and TSS concentrations shall not exceed 15% of the respective
influent value (85% removal).
4. Limit and monitor only if the facility adds chlorine or chlorine derivatives to wastewater that is
eventually discharged. The Division shall consider all effluent TRC values reported below 50 µg/L to
be in compliance with the permit. The Permittee shall continue to record and submit all values reported
by a North Carolina certified laboratory (including field certified), even if these values fall below 50
µg/L.
5. Total Nitrogen = TKN + NO3-N + NO2-N, where TKN is Total Kjeldahl Nitrogen, NO3-N is Nitrate
Nitrogen, and NO2-N is Nitrite Nitrogen.
6. The facility shall follow the compliance schedule detailed in Section A. (9.). The Permittee shall
achieve compliance with these limitations by March 1, 2022.
7. Total Silver shall be monitored using "clean" sampling techniques and reported to the lower reporting
level of the procedure.
8. Whole Effluent Toxicity shall be monitored using the Pass/Fail Chronic Toxicity test with
Ceriodaphnia dubia at 3% effluent. Samples shall be taken in March, June, September & December,
see Section A. (5.).
9. The Permittee shall perform three Effluent Pollutant Scans during the term of this permit; see Section
A. (6.).
10. The Permittee has deferred receiving -stream sampling to the Lower Cape Fear River Program by
memorandum of agreement (MOA). Should this MOA terminate for any reason, the Permittee shall
immediately inform the Division in writing and immediately resume instream monitoring in accordance
with this permit.
11. Stream samples shall be collected 3/week from June 1 through September 30, and collected weekly
from October 1 through May 31.
b. There shall be no discharge of floating solids or visible foam in other than trace amounts.
Page 4 of 20