NC0021849_Fact Sheet_20240222

NCDEQ/ DWR / NPDES

EXPEDITED FACT SHEET - NPDES PERMIT RENEWAL
NPDES Permit NC0021849
Caroline Robinson / Compliance & Expedited Permitting Unit / [e-mail] / Jan 2024
FACILITY INFORMATION
Town of Hertford (Janice Cole, Town Manager)
Applicant/Facility Name
Hertford WWTP
Applicant Address /Facility
114 West Grubb Street, Hertford, NC27944
Physical Address
Mailing Address P. O. Box 32,Hertford, NC 27944
Permitted Flow (MGD) 0.7 MGD
Type of Waste Municipal, < 1MGD
Facility Class WW-3 County Perquimans
Permit StatusRenewalRegional OfficeWaRO
STREAM CHARACTERISTICS
Stream
Perquimans RiverSC
Receiving Stream
Classification
Stream Segment 30-6-(3) Outfall Lat.36° 11' 51" N
Tidal Stream
76° 28' 08" W
7Q10 - Summer (cfs) Outfall Long.
Tidal Stream
7Q10 - Winter (cfs) Drainage basin Pasquotank River Basin
Tidal Stream
30Q2 (cfs) Subbasin 03-01-52
Average Flow (cfs) ~ HUC 030102050303
IWC (%) ~ 303(d) ListNo
BASIC INFO FOR EXPEDITED PERMIT RENEWAL
NH3 limits were added when the POTW expanded to
0.7 MGD based upon the speculative limit issued in
1998. Due to the tidal stream, the limits cannot be
Does permit need Daily Max NH limits?
3
recalculated using the toxicity spreadsheet. Facility has
been compliant with NH3 limits during the last permit
cycle. Limits will remain unchanged.
Does permit need TRC limits/footnote? TRC limit is at the standard for salt waters
Does permit have toxicity testing? No – not a complex wastestream
Does permit have any Special Conditions? Yes – effluent mercury analysis
Yes – U & D for Temperature and Dissolved Oxygen
Does permit have instream monitoring?
New expiration date: December 31, 2027
FACILITY SUMMARY
Town of Hertford operates a municipal wastewater treatment plant for an estimated 2,735 residents for the
Town of Hertford (Population 2,135) and the Town of Winfall (Population 600). The Hertford Wastewater
Treatment Plant is a minor facility (flow < 1 MGD) with a design capacity and permitted wastewater
discharge of 0.7. This facility is 100% domestic with no pretreatment program.
The original NPDES permit for this facility was issued in November 1981. The WWTP was expanded and
upgraded from 0.4 MGD to 0.7 MGD in March 2010. The town requested a permit modification on January
12, 2011 to increase discharge to 0.975 MGD from the permitted 0.7 MGD. An Engineering Alternatives
Analysis (EAA) was submitted with the request. A review of the EAA by the Complex NPDES Permitting
Unit staff determined that the EAA was very incomplete, did not justify the proposed flow increase and did

Fact Sheet for Permit Renewal
Jan 2024 - NPDES Permit NC0021849 - Page 1

not thoroughly evaluate alternatives, such as non-discharge via spray irrigation. The flow increase sought
was primarily based on excessive I & I that Hertford had been working on eliminating for years. Hertford
was informed that the Division cannot grant an expansion based only on excess I & I, that EPA would
challenge the permit if we did. The two towns worked together and reduced the I & I to an acceptable level
and requested renewal of the existing permit in September of 2012. This facility utilizes the following
treatment components:
Dual Mechanical bar screens
Dual Parshall flumes (with two flow meters)
Grit removal system
Influent pump station with three pumps
Oxidation ditch
Flow splitter
Two (2) Secondary Clarifiers
WAS pump station with dual pumps
Dual automatic backwashing disk filters
Chlorination using gaseous chlorine
Dual 27,500 gallon chlorine contact chambers
Dechlorination using sulfur dioxide gas
Outfall diffuser
One 55,000 gallon aerobic sludge digester
One 328,000 gallon sludge holding basin, with fine bubble diffusers
Sludge drying beds
Sludge loading station for trucks
Three (3) 125 kW back up generators with automatic transfer switches
Flow meter downstream of the chlorine contact chamber and sulfur dioxide injection

RENEWAL SUMMARY
This renewal contains the following changes:
Electronic data submission requirements have been updated.
Due to the ongoing compliance problems (non-compliant inspections) at your facility, monitoring
cannot be reduced at this time. However, you can request monitoring reduction at the next permit
renewal.

PERMITTEE REQUESTED MONITORING FREQUENCY REDUCTION
The Town of Hertford requested monitoring frequency reductions for BOD, TSS, and Ammonia
Nitrogen. Per the October 2012 guidance document, a review of their DMR data and their compliance
history from the last three years was done (August 2020 – August 2023). Based on this review,
discussions with the Washington Regional Office, and the most recent inspections at this plant, this
facility is ineligible for a reduction of monitoring for BOD, TSS, and Ammonia Nitrogen.
No enforcements for each requested parameter in the past 3-years?
o Yes – eligible
No more than two non-monthly average limit violations for each parameter in the past year
o Yes – eligible
Not under an SOC for the requested parameters?
o Yes – eligible
Not on EPA’s QNCR for the requested parameters?
o Yes, however, the facility is listed on the EPA’s QNCR for other violations – eligible
Data review – BOD, TSS, and Ammonia Nitrogen
o Yes – eligible
Discussion with Washington Regional Office regarding approval for the MFR:
o Robbie Bullock (Environmental Program Consultant) noted that the last inspection dated
11/16/2022 was non-compliant and that several of the facility components were

Fact Sheet for Permit Renewal
Jan 2024 - NPDES Permit NC0021849 - Page 2

nonoperational, including, the mechanical bar screen, the grit removal system, the two
aerators in the oxidation ditch, and tertiary filters. He also noted that the 2/24/2021
inspection was also non-compliant. Therefore WaRO is not in favor of reduced
monitoring. - Ineligible
See data evaluation attached.

COMPLIANCE HISTORY
Hertford WWTP has had four enforcements on record for an untreated wastewater bypass in 2019, a spill at
the mechanical bar screen in 2020, an unauthorized bypass of unknown quantity and one nonoperational
automatic disk filter in 2021, and nonoperational equipment in 2022, including aerators on the inside ditch,
the mechanical barscreens, the grit removal system, and the SCADA system for the influent pump station.
The facility has been issued one NOV in 2021 for a flow limit violation, one NOV in 2021 and one NOV in
2022 for permit condition violations, and one NOV for a Total Suspended Solids limit violation in 2023,
since the permit was originally issued in July 2018.

Most recent inspection (November 2022) showed the facility to be in noncompliance. Several components
of the wastewater treatment plant were either not operating or were only partially operational, including the
mechanical barscreens, the grit removal system, two oxidation ditch aerators, tertiary filters, an effluent
pump station

EFFLUENT MERCURY ANALYSIS
The permittee is required to provide one effluent mercury analysis, using EPA Method 1631E, in
conjunction with the next permit renewal application. The analysis should be taken within 12 months
prior to the application date. Any additional effluent mercury measurement conducted from the effective
day of this permit and up to the application date shall also be submitted with the renewal application. This
facility has reported an effluent mercury analysis for this permit cycle using EPA Method 1631E, dated
March 25, 2022.

Outfall
MontDaYear Parameter ParaSample UoM Value
h y m
Class
25 202
0023 COMER - Metal Grab ng/l 3
2
Mercury, Total (as
Hg) -
Concentration
COMMENTS ON DRAFT PERMIT
Jeffrey Talbott (Operator Certification Group) noted that the facility is classified as a WW-3 facility
with the ORC and all Backup ORC’s active and in good standing with the program.
Robbie Bullock (Environmental Program Consultant – Washington Regional Office) noted that the
draft permit had the pH limit as greater than 6 and less than 9, and the pH limit in the existing
permit was greater than 6.8 and less than 8.5. Mr. Bullock asked if the draft permit limit for pH was
correct, and the draft permit was edited to reflect the previous permit. The pH was changed back to
greater than 6.8 and less than 8.5 since pH is tied to stream classification and this facility discharges
to a saltwater stream. Mr. Bullock also noted that WaRO is NOT in favor of reduced monitoring,
since the last inspection dated 11/16/2022, was non-compliant and the facility had multiple issues.
The mechanical bar screen, grit removal system, two aerators in the oxidation ditch, and tertiary
filters were all non-operational. Mr. Bullock also noted that the prior inspection, dated 2/24/2021
also showed that the facility was non-compliant.

Fact Sheet for Permit Renewal
Jan 2024 - NPDES Permit NC0021849 - Page 3

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YYY
Reduce
(Yes/No)
Frequency?
NNN
Y/N
> 1?
000
asessment
**From BIMS
# civil penalty
NNN
Y/N
> 2?
010
# of non-
violations
**From BIMS
monthly limit
Y/N
< 20?
# daily >200%
samples
WA
200%
YYY
Y/N
<15?
040
# daily
>200%
samples
60
MA
42.511.3
200%
YYY
Y/N
< 50%?
other
for FC)
violations
report for
3-yr mean
3.01008775.35434950.0970299
(geo mean
Facility is on
15
MA
10.62.83
50%
YY
N
30
limit
Y/N?
21.25
average 5.66667
Monthly
4517
limit
31.875
Weekly average
NC0021849
Hertford WWTP
08/2020 - 08/2023
mg/Lmg/Lmg/L
Units
violations
for specific parameters
1. Not currently under SOC
TSS
yrs)
Facility:
Permit No.
Data Review
3. Facility or employees convicted of CWA
Facility had a CPA in 2020 and in 2021 related to unauthorized bypasses
BOD (Weighted)
Approval Criteria:
2. Not on EPA Quarterly noncompliance report
Review period (use 3 Ammonia (weighted)
Reduction in Frequency Evalaution

From:Talbott, Jeffrey
To:Robinson, Caroline; Bullock, Robert
Cc:Tankard, Robert
Subject:RE: Draft Permit Review NC0021849
Date:Wednesday, November 1, 2023 1:31:16 PM
Attachments:image001.png
Good afternoon Caroline,
Operator certification notes that this facility is classified as a WW-3, with the ORC and all
Backup ORC’s active and in good standing with the program.
We have no comments at this time.
Thank you.
Jeff Talbott
Supervisor, NC Operator Certification Program
Division of Water Resources
Department of Environmental Quality
Phone: [phone]
Email: [e-mail]
------------------------------------------------------------------------------------------------------------------------------
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.
From: Robinson, Caroline <[e-mail]>
Sent: Wednesday, November 1, 2023 9:57 AM
To: Bullock, Robert <[e-mail]>; Talbott, Jeffrey <[e-mail]>
Cc: Tankard, Robert <[e-mail]>
Subject: Draft Permit Review NC0021849
Hi Robbie and Jeffrey,
The NC0021849 draft permit renewal is ready for review! The draft permit renewal for Hertford
WWTP (NC0021849) will go to Notice on 11/14/2023. Please send me any comments as time
permits.
Thanks,
Caroline

Caroline Robinson (she/her/hers)
Environmental Specialist II, Division of Water Resources
North Carolina Department of Environmental Quality
Office: [phone] | Cell: [phone]
[e-mail]
Email correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third
parties by an authorized state official.

From:Robinson, Caroline
To:Bullock, Robert; Talbott, Jeffrey
Cc:Tankard, Robert
Subject:RE: Draft Permit Review NC0021849
Date:Monday, November 6, 2023 12:04:00 PM
Attachments:image001.png
Hi Robbie,
Great catch! I have fixed the draft permit limit for pH to reflect the previous permit, since pH is tied
to stream classification and this is a saltwater stream!
Thanks,
Caroline
Caroline Robinson (she/her/hers)
Environmental Specialist II, Division of Water Resources
North Carolina Department of Environmental Quality
Office: [phone] | Cell: [phone]
[e-mail]
From: Bullock, Robert <[e-mail]>
Sent: Friday, November 3, 2023 9:30 AM
To: Robinson, Caroline <[e-mail]>; Talbott, Jeffrey
<[e-mail]>
Cc: Tankard, Robert <[e-mail]>
Subject: RE: Draft Permit Review NC0021849
Caroline,
The draft permit has the PH limit as greater than 6 and less than 9, The PH limit in the existing permit
is greater than 6.8 and less than 8.5.
Is the draft permit limit for PH correct?
Thanks,

Robbie
Robbie Bullock
Environmental Program Consultant
Division of Water Resources
Water Quality Regional Operations
252-948-3843 Office
252-402-5832 Cell
[e-mail] Email

943 Washington Square Mall
Washington NC 27889
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.
From: Robinson, Caroline <[e-mail]>
Sent: Wednesday, November 1, 2023 9:57 AM
To: Bullock, Robert <[e-mail]>; Talbott, Jeffrey <[e-mail]>
Cc: Tankard, Robert <[e-mail]>
Subject: Draft Permit Review NC0021849

Hi Robbie and Jeffrey,

The NC0021849 draft permit renewal is ready for review! The draft permit renewal for Hertford
WWTP (NC0021849) will go to Notice on 11/14/2023. Please send me any comments as time
permits.

Thanks,

Caroline

Caroline Robinson (she/her/hers)
Environmental Specialist II, Division of Water Resources
North Carolina Department of Environmental Quality
Office: [phone] | Cell: [phone]
[e-mail]

Email correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third
parties by an authorized state official.

From:Robinson, Caroline
To:Bullock, Robert; Tankard, Robert
Cc:Hennessy, John
Subject:RE: Monitoring Frequency Reduction Request for Hertford WWTP - NC0021849
Date:Friday, October 27, 2023 10:07:00 AM
Attachments:image001.png
Hi Robbie,
Thank you for the update! I will work on getting this permit wrapped up and sent to you for review!
Thanks,
Caroline
Caroline Robinson (she/her/hers)
Environmental Specialist II, Division of Water Resources
North Carolina Department of Environmental Quality
Office: [phone] | Cell: [phone]
[e-mail]
From: Bullock, Robert <[e-mail]>
Sent: Friday, October 27, 2023 9:55 AM
To: Robinson, Caroline <[e-mail]>; Tankard, Robert
<[e-mail]>
Cc: Hennessy, John <[e-mail]>
Subject: RE: Monitoring Frequency Reduction Request for Hertford WWTP - NC0021849
Caroline,
WaRO is NOT in favor of reduced monitoring.
The last inspection dated 11/16/2022 was Non-Compliant and the facility had multiple issues.
Mechanical bar screen was not operational, grit removal system not operational, Two aerators in the
Oxidation ditch were not operational, Tertiary filters were not operational.
The 2/24/2021 inspection was Non-Compliant as well.

Thanks,
Robbie
Robbie Bullock
Environmental Program Consultant
Division of Water Resources
Water Quality Regional Operations
252-948-3843 Office
252-402-5832 Cell
[e-mail] Email

943 Washington Square Mall
Washington NC 27889
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.
From: Robinson, Caroline <[e-mail]>
Sent: Thursday, October 26, 2023 11:13 AM
To: Tankard, Robert <[e-mail]>; Bullock, Robert <[e-mail]>
Cc: Hennessy, John <[e-mail]>
Subject: RE: Monitoring Frequency Reduction Request for Hertford WWTP - NC0021849

Hi Robert and Robbie,

I wanted to circle back on the Monitoring Frequency Reduction Request for Hertford WWTP
(NC0021849)! The last time we talked about this MFR we were leaning towards denying the request,
but I think you wanted to look at the data in my previous email first and discuss (also attached to this
email). Please let me know how you would like to move forward with this request so that I can keep
the permit moving.

Thanks,
Caroline

Caroline Robinson (she/her/hers)
Environmental Specialist II, Division of Water Resources
North Carolina Department of Environmental Quality
Office: [phone] | Cell: [phone]
[e-mail]

From: Robinson, Caroline
Sent: Friday, September 29, 2023 1:18 PM
To: Tankard, Robert <[e-mail]>; Bullock, Robert <[e-mail]>
Cc: Hennessy, John <[e-mail]>
Subject: Monitoring Frequency Reduction Request for Hertford WWTP - NC0021849

Hi Robert and Robbie,

Attached is the permit renewal application for Hertford WWTP (NC0021849) that contains the
monitoring frequency reduction request. I also attached my excel sheet that shows the statistics
from the sampling results from the last three years (shown in the Evaluation tab). Based on the
data, it appears that the facility does meet the requirements for a MFR for the parameters
requested; however, the facility has had several other compliance issues throughout the last permit
cycle. Please let me know how you would like to proceed with this request or if we should schedule
another call to discuss.

Thanks,

Caroline

Caroline Robinson (she/her/hers)
Environmental Specialist II, Division of Water Resources
North Carolina Department of Environmental Quality
Office: [phone] | Cell: [phone]
[e-mail]