NC0031828_Modification_20190122

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MICHAEL S. REGAN
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LINDA CULPEPPER
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NORTH CAROLINA
Etwirannient rl Quality
January 22, 2019
Mr. Chad Braxton
City of Vanceboro
PO Box 306
Vanceboro,NC 28586-0306
Subject: Change-Page to Address Modification
NPDES Permit NC0031828
Vanceboro WWTP
Grade III Biological WPCS
Craven County
Dear Mr. Braxton:
Division personnel have reviewed and approved your application for modification of the subject permit.
Please insert these change pages into your existing permit and discard the old pages. We regret any
inconvenience this causes your organization
The final permit includes the following significant changes from the existing permit:
1. A compliance period of six(6)months from the permit modification effective date has been
added in Section A. (1) as footnote#9 allowing weekly monitoring for pH, dissolved oxygen,
BOD, total suspended solids, and upstream and downstream temperature. At the end of this six
(6)months,monitoring will revert to 3/Week as stated in the permit.
2. A compliance period of six (6)months from the permit modification effective date has been
added in Section A. (1) as footnote#10 allowing 2/Week monitoring for total residual chlorine.
At the end of this six (6)months,monitoring will revert to 3/Week as stated in the permit.
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 any other Federal, State, or Local governmental permit that may be required.
If you have any questions or need additional information,please do not hesitate to contact Brianna
Young of my staff at [phone].
ly,
'LW f tr")14-44_/
/Linda Culpepper
Director, Division of Water Resources
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North Carolina Department of Environmental Quality I Division of Water Resources
1617 Mail Service Center I Raleigh,North Carolina 27699-1617
919-707-9000

Mr. Chad Braxton
NC0031828 Issued Permit
cc: NPDES Files
Central files
Washington Regional Office
WSS/Aquatic Toxicology Branch

Permit NC0031828
PART I
A. (1) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
Grade III Biological WPCS [15A NCAC 08G .0302]
During the period beginning on the effective date of the permit and lasting until expiration,the
Permittee is authorized to discharge from outfall 001. Such discharges shall be limited and monitored'
by the Permittee as specified below:
EFFLUENT CHARACTERISTICS LIMITS . ' MONITORING REQUIREMENTS
Parameter Code Monthly Weekly Measurement Sample Sample Location 2
Average Average Frequency Type
Flow 50050 0.30 MGD Continuous Recording Influent or Effluent
Total Monthly Flow Monitor&Report Monthly Calculated Influent or Effluent
Total Residual Chlorine 3'10 50060 28 pg/L(Dail(Maximum) 3/Week Grab Effluent
Temperature(°C) 00010 Daily Grab Effluent
Temperature(°C)9 00010 3/Week Grab Upstream&
(June-September) Downstream
Temperature(°C) 00010 Weekly Grab Upstream&
(October-May) Downstream
pH 9 00400 Not<6.0 nor>9.0 3/Week Grab Effluent
Standard Units
Dissolved Oxygen 9 00300 Daily Average>5.0 mg/L 3/Week Grab Effluent
Dissolved Oxygen(mg/L)9 00300 3lWeek Grab Upstream&
(June-September) Downstream
Dissolved Oxygen(mg/L) 00300 Weekly Grab Upstream&
(October-May) Downstream
BOD,5-day(20°C)4'9 C0310 5.0 mg/L 7.5 mg/L 3/Week Composite Influent&Effluent
(April 1 —October 31)
BOD,5-day(20°C)4,9 C0310 10.0 mg/L 15.0 mg/L 3/Week Composite Influent&Effluent
(November 1 —March 31)
Total Suspended Solids 4,9 C0530 30.0 mg/L 45.0 mg/L 3/Week Composite Influent&Effluent
NH3 as N 9 C0610 2.0 mg/L 6.0 mg/L 3/Week Composite Effluent
(April 1 —October 31)
NH3 as N 9 C0610 4.0 mg/L 12.0 mg/L 3/Week Composite Effluent
(November 1 —March 31)
•
Fecal Coliform 9 31616 200/100 ml 400/100 ml 3/Week Grab Effluent
(geometric mean)
TKN(mg/L) 00625 Monitor&Report ' 2/Month Composite Effluent
NO2-N+NO3-N(mglL) 00630 Monitor&Report 2/Month Composite Effluent
TN (mg/L)5 C0600 Monitor&Report 2/Month Composite Effluent
TN Load 6 QM600 Monitor&Report(lb/mo) Monthly Calculated Effluent
TN Load 6 QY600 Monitor&Report(Ib/yr) Annually Calculated Effluent
Total Phosphorus 7 C0665 1.0 mg/L Monthly Composite Effluent
Total Mercury 8 71900 Monitor&Report See Footnote 8 Grab Effluent
Footnotes are on the following page.
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Permit NC0031828
Footnotes:
1. The permittee shall submit discharge monitoring reports electronically using the NC DWR's eDMR
application system [see Section A. (6)].
2. Upstream=at NCSR 1440. Downstream=approximately 2 miles downstream from the outfall.
3. The Division shall consider all effluent TRC values reported below 50 µg/L to be in compliance with the
permit.However,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.
4. The monthly average effluent BOD5 and TSS concentrations shall not exceed 15%of the respective influent
value(85%removal).
5. For a given wastewater sample,TN=TKN+NO2-N+NO3-N,where TN is Total Nitrogen and TKN is Total
Kjeldahl Nitrogen.
6. TN Load is the mass load of Total Nitrogen discharged in a given period of time. See Section A. (2)
Calculation of Total Nitrogen Loads.
7. The monthly average for total phosphorus shall be the average of composite samples collected monthly.
8. Mercury must be monitored once during the permit cycle. See Section A. (5)Effluent Mercury Analysis.
9. Monitoring will be maintained at weekly until six(6)months from the permit modification effective date, at
which time the 3/Week sampling will be implemented.
10. Monitoring for total residual chlorine will remain at 2/Week until six(6)months from the permit modification
effective date, at which time the 3/Week sampling will be implemented.
ALL SAMPLES SHALL BE FROM A REPRESENATIVE DISCHARGE EVENT.
THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN
TRACE AMOUNTS.
Page 4 of 9