HomeMy WebLinkAboutNC0031828_Draft Permit_20181128 Lr j.
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NORTH CAROLINA
• Environmental Quality
ROY COOPER
covet/tc
MICHAEL S.REGAN
Secretary
LINDA CULPEPPER
InWetina Director
November 28, 2018
Mr. Chad Braxton
City of Vanceboro
PO Box 306
Vanceboro,NC 28586-0306
Subject: Draft NPDES Permit Modification
NC0031828
Vanceboro WWTP
Class WW-3
Craven County
Dear Mr. Braxton:
The Division has reviewed the request from Mr. Vernon Edwards, ORC, to modify the subject permit to
allow a compliance period for the increased monitoring in the recently issued permit. Please review this
draft modification carefully to ensure your thorough understanding of the information, conditions, and
requirements it contains.
The draft modification permit pages include 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.
laPirll IM)
b.
North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street 11617 Mail Service Center I Raleigh,North Carolina 27699-1617
919.707.9000
With this notification, the Division will solicit public comment on this draft permit by publishing a
notice in newspapers having circulation in the general Craven County area, per EPA requirements.
Please provide your comments,if any,to me no later than 30 days after receiving this draft
permit.
Following the 30-day public comment period, the Division will review all pertinent comments and take
appropriate action prior to issuing a final permit. If you have questions concerning the draft,please
contact me at 919-707-3619, or via e-mail [Brianna.Young@ncdenr.gov].
Sincerely,
Brianna Young
Compliance and Expedited ermitting Unit
cc: NPDES Files
Washington Regional Office
Wastewater Operator Certification Group
WSS/Aquatic Toxicology Branch
Permit N•C0031828
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 `,, '>Continu`ous Recording Influent or Effluent
Total Monthly Flow Monitor&Rep/ort/ Monthly.a'''';- Calculated Influent or Effluent
Total Residual Chlorine 3,10 50060 28 pg/L(Daily Maximum) 3/Week `'', )•.Grab Effluent
Temperature(°C) 00010 `.. : Daily N::Grab Effluent
Temperature(°C)9 '
;, �..'3/
.' o Upstream&
00010 Week Grab
(June -Se tember p ) ,,--.. ,;, „). Downstream
Temperature(°C) \ `'-, ` ! Upstream&
00010 \ n, - \sWeek' Grab
(October-May) \,° ,,s,'•<, • �, y Downstream
s
Not 6'0 nor<>y9 0. `� \
pH 00400 -k 3/Week Grab Effluent
Standard Units :›-, \ '
Dissolved Oxygens ,/00300 `,\Daily Average�>5.0 mg/L ;"`-3/Week, , Grab Effluent
Dissolved Oxygen(mg/L)9( (00300 << '` ' 3hWeek Grab - Upstream&
(June-September) ` `., << Downstream
Dissolved Oxygen(mg/L) 00300 �` j Weekly Grab Upstream&
(October-May) _, ' �--„ ' 'i,,, Downstream
BOD, 5-da 20°C 4,9 o�'a N .= r----.. v.: ;
y( ) 1) vC0310 5:0 ma/l:', '7.5 mg/L 3/Week Composite Influent&Effluent
(April 1 —Oe(ober'31) '�- \, ti
BOD,5-day,,(20°C)4,9 ' `_/
C03110.0 rig/L. 15.0 mg/L 3/Week Composite Influent&Effluent
(November 1 -°March 31) y
Total Suspended‘Solids 4,9 C0530, :'430.0 mg/L - 45.0 mg/L 3/Week Composite Influent&Effluent
NH3asN9 '';'"v _
(April 1 —October 31)..' ''.aux C0610 \'`2.0 mg/L 6.0 mg/L 3/Week Composite Effluent
NH3 as N9 .;,, '°C0610� ..4 0 mg/L 12.0 mg/L 3/Week Composite Effluent
(November 1 —March 31) �:. . , A „�6q
Fecal Coliform 9 4z ;,
(geometric mean) 31616' 200/100 ml 400/100 ml 3/Week Grab Effluent
TKN (mg/L) 00625 Monitor&Report 2/Month Composite Effluent
NO2-N+NO3-N (mg/L) 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 6 71900 Monitor&Report See Footnote 8 Grab Effluent
Footnotes are on the following page.
Page 3 of 9
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 pro of time. See Section A. (2)
Calculation of Total Nitrogen Loads.
7. The monthly average for total phosphorus shall be the average of cbmposite samples collected monthly.
8. Mercury must be monitored once during the permit cycle. S
`. ee 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/Weekj sampling wilLbe'imple j entfe/d.
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. i'
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