NC0021849_technical Correction_20100126

NCDENR '
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins
Governor Director
January 26, 2010
Mr. John Christensen
Town Manager
Town of Hertford
PO Box 32
Hertford, North Carolina 27944
Subject: NPDES Permit Correction
Permit Number NCO021849
Town of Hertford WWTP
Perquimans County
Dear Mr. Christensen:
Dee Freeman
Secretary
The Division issued NPDES permit NCO021849 to the Town of Hertford on December 17, 2007. It has come to our attention
the reference to the new discharge location, effective with the plant expansion, should be Outfall 002 rather than Outfall 001. This
permit correction revises the reference to the discharge location.
Enclosed please find the modified permit pages. These pages should be inserted into your permit and the old ones discarded.
This permit modification 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).
Please take notice that this permit is not transferable. This permit does not affect the legal requirement to obtain other
permits which may be required by the Division of Water Quality or permits required by the Division of Land Resources, Coastal Area
Management Act or any other Federal or Local government permit that may be required.
E11
If you have any questions concerning this permit modification, please contact Karen Rust at telephone number (919) 807-
Sincerely,
. r : Coleen H. Sullins
cc: Washington Regional Office, Surface Water Protection Section
Central Files
NPDES Files
1617 Mail Service Center, Ralegh, North Carolina 27699-1617 One
Location: 512 N. Salisbury St Raleigh, North Carolina 27604 NorthCarolina
Phone: [phone] Fax: [phone] \ Customer Service: 1.877.623-6748
Internet: www.ncwaterquality.org Naturally
An Equal opportunity 1 Affirmative Action Employer

Permit NCO021849
SUPPLEMENT TO PERMIT COVER SHEET
All previous Nm PDES Permits issued to this facility, whether for operation or discharge are
hereby revoked. As of this permit issuance, any previously issued permit bearing this
number is no longer effective. Therefore, the exclusive authority to operate and discharge
from this facility arises under the permit conditions, requirements, terms, and provisions
included herein.
The Town of Hertford is hereby authorized to:
1. Operate a 0.4 MGD wastewater treatment system that includes the following
components:
• Mechanical bar screen
• Grit removal system
• Clarifier
• Post aeration
• Sludge digester
• Chlorine disinfection
• Sludge drying beds
This facility is located at the Hertford WWTP on NCSR 1108, North of Hertford in
Perquimans County.
2. After constructing the necessary facility upgrades, operate a 0.7 MGD wastewater
treatment plant.
3. Discharge from said treatment works at the location specified on the attached map
into the Perquimans River, a class C-Swamp stream (location of outfall at 0.4 MGD;
outfall 001) and class SC (location of outfall after upgrade to 0.7 MGD; outfall 002)
in the Pasquotank River Basin.

Permit NCO021849
A (2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (0.7 MGD)
During the period beginning upon expansion above 0.4 MGD and lasting until expiration, the Permittee is
authorized to discharge from outfall 002. Such discharges shall be limited and monitored by the Permittee as
specified below:
EFFLUENT
DISCHARGE LIMITATIONS
MONITORING REQUIREMENTS
.CHARACTERISTICS,
..
(PaCa►nefer Codes)
'„ ' k
Monthly
Average'.
Weekly
. Aveia a p,;
Daily
.' Maximum
Measurement
'Frequency
Sample ,
Type
Sample Location_' ,
Flow
0.7 MGD
Continuous
Recording
Influent or Effluent
(50050
BOD, 5-Day, 20OC2 (00310)
15.0 mg/L
22.5 mg/L
3/Week
Composite
Influent and Effluent
(April 1— October 31)
BOD, 5-Day, 20OC2 (00310)
30.0 mg/L
45.0 mg/L
3/Week
Composite
Influent and Effluent
(November 1 — March 31)
Total Suspended Solids2
30.0 mg/L
45.0 mg/L
3/Week
Composite
Influent and Effluent
(00530)
NH3 as N (00610)
4.0 mg/L
12:0 mg/L
3/Week
Composite
Effluent
(April 1 — October 31)
NH3 as N (00610)
8.0 mg/L
24.0 mg/L
3/Week
Composite
Effluent
(November 1— March 31
Dissolved Oxygen3
3/Week
Grab
Effluent
(00300
Dissolved Oxygen (00300)
3/Week
Grab
Upstream & Downstream
(June 1— September 30)
Dissolved Oxygen (00300)
Weekly
Grab
Upstream & Downstream
(October 1 — May 31
Enterococci (61211)
35 / 100 ml
276 / 100 ml
3/Week
Grab
Effluent
(geometric mean)
Total Residual Chlorine4
13/jg/L
3/Week
Grab
Effluent
(50060)
Temperature
Daily
Grab
Effluent
00010)
Temperature (00010)
3/Week
Grab
Upstream & Downstream
June 1— September 30
Temperature (00010)
Weekly
Grab
Upstream & Downstream
(October 1 — May 31
Total Phosphorus
Quarterly
Composite
Effluent
00665)
Total Nitrogen (00600)
Quarterly
Composite
Effluent
(NO2+NO3+TKN)
pH5
3/Week
Grab
Effluent
(00400)
NOTES:
1. Upstream = At least 100 feet upstream from the confluence with the Perquimans River. Downstream = At least 100
feet downstream from the confluence with the Perquimans River.
2. The monthly average effluent BODs and total suspended solids concentrations shall not exceed 15% of their respective
influent values (85% removal).
3. The daily effluent dissolved oxygen concentration shall not be less than 5.0 mg/L.
4. Limit and monitoring required only if chlorine is used for disinfection.
5.. The pH shall not be less than 6.8 standard units nor greater than 8.5 standard units.
There shall be no discharge of floating solids or visible foam in other than trace amounts.