NC0082384_Fact Sheet_20221128

DENR/DWR
EXPEDITED FACT SHEET - NPDES PERMIT DEVELOPMENT
NPDES Permit: NCO082384
2022 Renewal
This form must be completed by Permit Writers for all expedited permits which do not require full Fact Sheets.
Expedited permits are generally simple 100% domestics (e.g., schools, mobile home parks, etc.) that can be
administratively renewed with minor changes, but can include facilities with more complex issues (Special
Conditions, 303 (d) listed water, toxicity testing, instream monitoring, compliance concerns).
Facility and Stream Information
Applicant/Facility Name:
Stokes Count Danbury WWTP
Applicant Address:
P.O. Box 20; Danbury, NC 27016
Facility Address:
NC Hwy 89; Danbury, NC 27016
Facility Class/Permit Status:
Grade II Biological
WPCS / Renewal
Permitted Flow (as
built
0.1 MGD
Type of Waste
100% Domestic
Receiving Stream
Dan River
Stream Class / ID
WS-V / 22- 8
River Basin
Roanoke
Subbasin
03-02-01
HUC
030101030109
USGS Too
B18NW Danbur
7Q10 S W cfs
55 79
30Q2 cfs
115
Avg. Stream Flow cfs
334
IWC % sum/win
0.28 0.20
County
Stokes
Regional Office
WSRO
Basic Information for
Expedited Permit Renewal
Permit Writer / Date
Bradley Bennett / September 7, 2022
Does permit need daily max NH3 limits?
No - High Dilution - Dan River
Does permit need TRC limits/language?
Yes - Already in permit
Does permit have toxicity testing?
No
Does permit have Special Conditions?
None
Does permit have instream monitoring?
No
Stream on 303 d List? For w arameter?
No - Mercury statewide issue only
Any compliance concerns?
See Compliance Discussion
Any modifications since lastpermit?
None in the application
New expiration date:
February 28, 2027
FACILITY OVERVIEW:
This facility treats domestic waste from a portion of Stokes county near Danbury and serves a population of
183. The facility has a permitted and as-bult flow of 0.1 MGD. The current treatment system includes the
following wastewater treatment components:
• Manual bar screen
• Aerated flow equalization chamber with
dual pumps
• Dual aeration basins with three blowers
• Dual hopper bottom clarifiers
APPLICATION
• Aerobic sludge digester
• 3 module ultraviolet disinfection system
• Flow measurement & recording
• Duplex submersible effluent pump station
The application does not indicate any changes in the facility or treatment since the last renewal of the permit.
The application cover page notes that the outfall location has been updated in the application since it was
previously indicated in the wrong location. The treatment system is operated by Stokes County. The annual

average daily flow is indicated as around 0.04 MGD over the last three years, so the facility is operating below
its designed and permitted capacity. The facility uses Pace Analytical for weekly operation, sampling and
notification to owner.
INSPECTION
The most recent NPDES inspection occurred on February 1, 2022. Composite samplers were down and grab
samples were being collected instead. The inspector noted that solids were making their way through the plant
and the permittee needed to mitigate the source of solids at the influent. There were also issues noted with the
UV system needing to be fully equipped and operational and that there needed to be adequate parts on hand to
minimize impacts.
The last inspection under the Deemed Collection System Permit (WQCSD0253) was September10, 2020, and
there were no violations.
COMPLIANCE:
During the permit cycle this facility has had four (4) NODS and thirteen (13) NOVs. The violations have been
largely for Fecal and TSS issues. There have been two (2) enforcement actions over the permit cycle. The
permittee paid a total of $911.65 with penalties of $700.
MONITORING DATA REVIEW:
Parameter Units
Min
A
v
Permit Limit
Comments
Flow (MGD)
0.01
0.2
0.032
0.1 MA
Average flow is at 34% of as -built flow
BOD (mg/L) Effluent
< 2
38.2
4.1
30 MA
45 WA
No Exceedances
97% Removal
TSS (mg/L) Effluent
1
102.5
7.35
30 MA
45 WA
One (1) MA and five (5) WA exceedances
94% Removal
Temp (C) - Effluent
0.97
40.46
16.35
-
NHa-N (mg/L)
< 0.01
19.4
1.23
-
Fecal Coliform (#/ml)
< 1
2420
155.7
200 MA
400 WA
Thirteen (13) WA exceedances
TRC (µg/L)
< 1
26
2.98
28 DM
No Exceedances
Total Nitrogen (mg/L)
1
51.7
21.3
-
Total Phosphorus (mg/L)
0.10
6.46
3.68
-
pH (su)
5.8
7.5
1 N/A
>_6 and <_9
One value less than 6
MA -Monthly Average DM - Daily Max QA -Quarterly Average DA - Daily Average An Avg - Annual Avg. Summer -April -Oct Winter - Nov - March
The data reviewed for the renewal is from March 2017 through June 2022.
REVIEW OF PERMIT LIMITS AND PARAMETERS OF INTEREST:
Flow - The facility is operating on average at around 34% of the as -built flow allowed by the permit. Only
sixteen of the 64 monthly values were at or above this 0.034 MGD level.
BOD - No limit violations for BOD and the average BOD removal was 97%.
TSS - There were six TSS limit exceedances. Overall TSS removal averaged 94%.
Fecal Coliform - There were thirteen (13) weekly average exceedances of fecal limits. Note above that the last
inspection noted a need for better operation of the UV disinfection equipment.
Danbury WWTP Fact Sheet
NPDES Renewal 2022 - September 7, 2022
Page 2

FILE HISTORY REVIEW SUMMARY
• 1992 Waste Load Allocation (WLA) - Established for a proposed 0.10 MGD discharge with stream flows as
noted earlier in the Fact Sheet. Limits established as Summer/Winter:
Flow (MGD)
Permitted
BOD
m L
TSS
m L
TRC
µ L
Fecal per
100 mL
pH
0.10
30 30
30 30
28 28
200 200
6 to 9
Recommended chlorination or UV disinfection. No parameters water quality limited but could impact
future allocations. Original Issuance date of the permit noted as February 26, 1993.
June 28, 1994 - Authorization to Construct (ATC) for construction of 0.10 MGD extended aeration pacakage
plant with clarifier and sludge return.
January 22,1997 - Permit Renewal - Notes that the facility began discharging in late 1995 and that
parameters are effluent limited due to the assimilative capacity of the receiving stream. Some monitoring
changed to weekly due to the classification as a Class II facility. Renewal removed a few special conditions
that no longer applied and set limits as
Flow (MGD)
BOD
m L
TSS
m L
Fecal per
100 mL
pH
TRC
µ L
0.10
30 45
30 45
200 400
6 to 9
28
BOD and TSS also included requirement for 85% pollutant removal. The permit included monitoring for
NH3-N, Temperature, TN and TP with no instream monitoring required.
• May 15, 2002 - Permit Renewal - TRC changed to 2/week and temperature to daily due to 213.0500
standards. There is information in the file about a 1999 request from the Stokes County Soil and Water
Conservation District requesting to use part of the discharge in a constructed wetland demonstration
project. There is no further information on this project.
• May 22, 2007 - Permit Renewal - No changes.
• April 18, 2012 - Permit Renewal - Added TRC footnote on compliance threshold.
• January 6, 2017 - Permit Renewal - eDMR language added to the permit. Some compliance issues noted in
the fact sheet.
PROPOSED PERMIT CHANGES:
• Updated eDMR requirements to be consistent with final EPA rule.
• Added regulatory citations throughout permit as needed.
• Permit map information updated including location of outfall and WWTP and coordinates for outfall as
provided in the application.
PROPOSED SCHEDULE FOR PERMIT ISSUANCE:
Draft Permit to Public Notice: September 20, 2022
Permit Scheduled Effective Date: December 1, 2022
STATE CONTACT:
If you have questions concerning the above or the attached documents, please contact Bradley Bennett at
bradley.bennettOncdenr.gov. .
Danbury WWTP Fact Sheet
NPDES Renewal 2022 — September 7, 2022
Page 3

Bennett, Bradley
From: Bennett, Bradley
Sent: Monday, November 28, 2022 9:39 AM
To: Stewart Easter
Cc: [e-mail]
Subject: Final Permit for Danbury WWTP - NCO082384
Attachments: NC0082384_Final Permit and Cover Ltr Signed_2022.pdf
Mr. Easter,
Attached is the Final issued NPDES discharge permit for the Danbury WWTP — NC0082384. The renewed permit will
become effective on January 1, 2023. Please continue to abide by your current permit until that time. If you have any
questions, feel free to contact me through this email.
Please respond to this email to let me know that you received the permit and were able to download, view, print and
copy the document for your records.
Thanks for your help in the renewal process.
Bradley Bennett
Compliance and Expedited Permitting
NC Division of Water Resources
1617 Mail Service Center
Raleigh, NC 27699-1617
Phone: [phone]
Email: [e-mail]
Email correspondence to and from this address may be subject to public records laws
1

Bennett, Bradley
From: Bennett, Bradley
Sent: Monday, November 28, 2022 12:08 PM
To: Graznak, Jenny
Subject: Final Permit Issuance - Danbury WWTP - NCO082384
Hey Jenny,
Hope you are doing well. Just wanted to let you know that this one has been signed and was sent out to the permittee
today. The renewed permit will be effective January 1, 2023. The permit and Fact Sheet are available in Laserfiche.
Thanks for your help on this one.
fi:3
Bradley Bennett
Compliance and Expedited Permitting
NC Division of Water Resources
1617 Mail Service Center
Raleigh, NC 27699-1617
Phone: [phone]
Email: [e-mail]
Email correspondence to and from this address may be subject to public records laws

NORTH CAROLINA
STOKES COUNTY
AFFIDAVIT OF PUBLICATION
Before the undersigned, a Notary Public of said County and State, duly
commissioned, qualified and authorized by law to administer oaths,
personally appeared Sandra Hurley who being first duly
sworn, deposes and says: that he (she) is Regional Publisher
(Publisher or other officer or employee authorized to make affidavit) of
ADAMS PUBLISHING GROUP, LLC, engaged in the publication of a
newspaper known as THE STOKES NEWS, published, issued, and entered
as periodicals class mail in the city of King in said County and State; that
he (she) is authorized to make this affidavit and sworn statement; that the
notice or other legal advertisement, a true copy of which is attached hereto,
was published in THE STOKES NEWS on the following dates:
and that the said newspaper in which such notice, paper, document or
legal advertisement was published was, at the time of each and every such
publication, a newspaper meeting all of the requirements and
qualifications of Section 1-597 of the General Statutes of North Carolina
and was a qualified newspaper within the meaning of Section 1-597 of the
General Statutes of North Carolina.
This day of , 2022
.11 F 1 A
Signature o7per'son making affidavit
Sworn to and subscribed before me, this day of
52�€ 2022
lvv�.
Notary Public
My Commission expires: ..11 fi2M�j� 13l oe( , (o
=-North
SON
Carolinayember 13, 2121
Public Notice
North Carolina
Environmental
Management
Commission/NPDES Unit
1617 Mail Service Center
Raleigh, INC 27699-1617
Notice of Intent to Issue a
NPDES Wastewater Permit
NCO082384 Danbury WWTP
The North Carolina Environ-
mental Management Commis-
sion proposes to issue a
NPDES wastewater discharge
permit to the person(s) listed
below. Written comments re-
garding the proposed permit
will be accepted until 30 days
after the publish date of this
notice. The Director of the NC
Division of Water Resources
(DWR) may hold a public hear-
ing should there be a signifi-
cant degree of public interest.
Please mail comments and/or
information requests to DWR
at the above address. Inter-
ested persons may visit the
DWR at 512 N. Salisbury
Street, Raleigh, NC 27604 to
review information on file. Ad-
ditional information on NPDES
permits and this notice may be
found on our website:
http: //deq. nc. gov/about/divi -
sions/water-resources/water-
resou rces-oe rm its/wastewate r-
branch/n Ades-wastewater/pub-
lic-notices,or by calling (919)
707-3601. Stokes County,
[P.O. Box 20; Danbury, NC
27016] has requested renewal
of NPDES permit NCO082384
for the Danbury WWTP, lo-
cated in Stokes County. This
permitted facility discharges
treated wastewater to the Dan
River, a class WS-V water in
the Roanoke River Basin.
Some of the parameters in the
permit are water quality limited.
This discharge may affect fu-
ture allocations in this segment
of the Dan River.
Publish: 9-29-22 118676

Bennett, Bradley
From: Kirby, Ben
Sent: Wednesday, September 28, 2022 9:00 AM
To: Bennett, Bradley
Cc: Hudson, Eric
Subject: RE: Draft Permit - Danbury WWTP - NCO082384
Attachments: NCO082384 PWS Memo 2022 Signed.pdf
Bradley,
I attached the signed memo.
Thanks,
Ben Kirby, E.I. (he/him/his)
Assistant Regional Engineer, Winston-Salem Regional Office
Division of Water Resources, Public Water Supply Section
North Carolina Department of Environmental Quality
Office: [phone] 1 Cell: [phone]
ben. kirby(a ncdenr.gov
450 West Hanes Mill Road, Suite 300, Winston-Salem, NC 27105
Dl-,.E Q:>
NORTH CAROLINA
Department of Environmental Quality
Email correspondence to and from this address is subject to the North
Carolina Public Records Law and may be disclosed to third parties.
From: Bennett, Bradley <[e-mail]>
Sent: Monday, September 26, 2022 11:10 AM
To: Kirby, Ben <[e-mail]>
Cc: Hudson, Eric <[e-mail]>
Subject: RE: Draft Permit - Danbury WWTP - NCO082384
Ben,
Sorry, I didn't attach the memo. Here it is.
fi:3
Bradley Bennett
Compliance and Expedited Permitting
NC Division of Water Resources
1617 Mail Service Center
Raleigh, NC 27699-1617
Email: [e-mail]

Email correspondence to and from this address may be subject to public records laws
From: Bennett, Bradley
Sent: Monday, September 26, 2022 10:59 AM
To: Kirby, Ben <[e-mail]>
Cc: Hudson, Eric <[e-mail]>
Subject: Draft Permit - Danbury WWTP - NCO082384
Hey Ben,
Sorry I'm getting this one to you a little late. I was out last week and meant to log in and send this to you but I forgot. If
you need more time to review than is indicated on the memo, that is fine, just let me know.
Thanks
m
Bradley Bennett
Compliance and Expedited Permitting
NC Division of Water Resources
1617 Mail Service Center Email: bradlev.bennett(@rcdenr.gov
Raleigh, NC 27699-1617
Email correspondence to and from this address may be subject to public records laws

ROY COOPER
Governor
ELIZABETH S. BISER
Secretary
RICHAW E. ROGERS,,JR.
Director
MEMORANDUM
NORTH CAROLINA
Environmental Quality
September 20, 2022
To: Eric Hudson and Ben Kirby
NC DEQ / DWR / Public Water Supply
Winston- Salem Regional Office
From: Bradley Bennett BB
Compliance and Expedited Permitting Unit
Subject: Review of Draft NPDES Permit NCO082384
Danbury WWTP
Stokes County
Please indicate below your agency's position or viewpoint on the draft permit and
return this form by October 20, 2022. If you have any questions on the draft permit,
please contact me via e-mail [bradley. bennett@ncdenr. gov] .
RESPONSE: (Check one)
®Concur with the issuance of this permit provided the facility is operated and maintained
properly, the stated effluent limits are met prior to discharge, and the discharge does not
contravene the designated water quality standards.
F] Concurs with issuance of the above permit, provided the following conditions are met:
Opposes the issuance of the above permit, based on reasons stated below, or attached:
Signed Date:
_-ZNorth Carolina Department of Environmental Quality I Division of Water Resources
DEQ wp�
512 North Salisbury Street 1 1617 Mail Service Center I Raleigh, North Carolina 27699-1617
NOHiNCAFi0L1NA y_
Oepartment of Environmental Ouality 919.707.9000

Bennett, Bradley
From: Stewart Easter <[e-mail]>
Sent: Tuesday, September 27, 2022 12:40 PM
To: Bennett, Bradley
Subject: [External] RE: Draft Permit for Danbury WWTP - NCO082384
CAUTION: External email. Do not click links or open attachments unless you verify. Send all suspicious email as an attachment to
Report Spam.
Bradley
Everything looks good.
Thanks
From: Bennett, Bradley <[e-mail]>
Sent: Sunday, September 18, 2022 7:53 AM
To: Stewart Easter <[e-mail]>
Cc: [e-mail]
Subject: Draft Permit for Danbury WWTP - NCO082384
CAUTION: This email originated from outside of the County Network. Do not click links or open attachments unless you
recognize the sender and know the content is safe.
Mr. Easter:
We have completed the draft permit renewal for the Danbury WWTP - NC0082384. This draft will go to pulic
notice this week. I have attached the draft for your review. If you have any comments or questions let me
know. I will be unavailable until the week of September 26t" but you can email any questions/concerns and I
will get back to you then.
Please respond to this email to verify that you recieved the permit and could download, open, save and
print the file for your needs.
Thanks
Bradley Bennett
Compliance and Expedited Permitting Phone: [phone]
NC Division of Water Resources
1617 Mail Service Center Email: [e-mail]
Raleigh, NC 27699-1617
Email correspondence to and from this address may be subject to public records laws
DISCLAIMER : Email correspondence to and from this sender is subject to the N.C. Public Records Law and may be
disclosed to third parties.

Bennett, Bradley
From: Thedford, Wren
Sent: Tuesday, September 20, 2022 1:48 PM
To: Bennett, Bradley
Subject: Re: Draft Permit Renewal for Notice - Danbury WWTP - NCO082384
Document received, thanks.
From: Bennett, Bradley <[e-mail]>
Sent: Sunday, September 18, 2022 7:44 AM
To: Thedford, Wren <[e-mail]>
Subject: Draft Permit Renewal for Notice - Danbury WWTP - NCO082384
Hey Wren,
Here is a permit for public notice. I have updated the info in Access and I will email the draft to the
permittee. I will be out all this week and may not have access to email. If there is an issue with this one and
you need to get in touch with me, you can call or text at [phone].
Thanks
Bradley Bennett
Compliance and Expedited Permitting Phone: [phone]
NC Division of Water Resources
1617 Mail Service Center Email: [e-mail]
Raleigh, NC 27699-1617
Email correspondence to and from this address may be subject to public records laws

Bennett, Bradley
From: Graznak, Jenny
Sent: Friday, September 9, 2022 11:50 AM
To: Bennett, Bradley
Subject: RE: Draft Permit - Danbury WWTP - NC0082384
Hey there, we didn't see any issues with the draft. We will put them on the inspection list for the next inspection year,
and will handle that way. No need to put in cover letter, thanks!
Jenny Graznak
Assistant Regional Supervisor
Winston Salem Regional Office
Division of Water Resources
Department of Environmental Quality
450 West Hanes Mill Road, Suite 300
Winston Salem NC 27105
336-776-9695 office
336-403-7388 mobile
[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: Bennett, Bradley <[e-mail]>
Sent: Wednesday, September 7, 2022 7:23 AM
To: Graznak, Jenny <[e-mail]>
Subject: Draft Permit - Danbury WWTP - NC0082384
Hey Jenny,
Here is the draft permit for Danbury for your review. The application is in Laserfiche. If you want me to mention
anything about the issues from the recent inspection in the cover letter just let me know and I can make those
additions. If you guys just want to handle that then we can leave the letter like it is.
Thanks
mm
Bradley Bennett
Compliance and Expedited Permitting
NC Division of Water Resources
1617 Mail Service Center Email: [e-mail]
Raleigh, NC 27699-1617
Email correspondence to and from this address may be subject to public records laws

Bennett, Bradley
From: Carpenter, Sydney
Sent: Thursday, September 8, 2022 5:22 PM
To: Bennett, Bradley
Subject: RE: Draft for Review - Danbury WWTP - NC0082384
Hey Bradley,
The permit looks great! The only things I caught are the following:
-'Director' is mentioned twice on the signature line of the first page of the permit
-There's an extra '03' in the HUC code on the permit map
I also wanted to mention that the renewal application in your folder is only one page, just so you know! I pulled the full
application from Laserfiche to check everything, but everything looks good! Great job!
Thanks,
Sydney Carpenter (she/her)
Environmental Specialist 1
Compliance and Expedited Permitting Branch
Division of Water Resources
NC Department of Environmental Quality
Office: 919-707-3712
svdnev.caroenterCcDncdenr.aov
1617 Mail Service Center
Raleigh, NC 27699-1617
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.
From: Bennett, Bradley <[e-mail]>
Sent: Wednesday, September 7, 2022 7:20 AM
To: Carpenter, Sydney <[e-mail]>
Subject: Draft for Review - Danbury WWTP - NCO082384
Hey Sydney,
Hope you are doing well. I have another draft for review on the OneDrive, the link is below. Sorry to bug you with a
special request, but is there any chance you could look at this one some time this week? I will be out of town the week
of Sept 19t" when we have the next public notice so I was hoping to go ahead and get this one to Wren maybe on
Monday of next week if I could so she would have it for the following week's notice. If that isn't possible just let me
know.
M NCO082384 - Stokes Countv - Danbury WWTP
Thanks

Bradley Bennett
Compliance and Expedited Permitting
NC Division of Water Resources
1617 Mail Service Center Email: bradley.ben nett(o)ncdenr.gov
Raleigh, NC 27699-1617
Email correspondence to and from this address may be subject to public records laws

Bennett, Bradley
From: Stewart Easter <[e-mail]>
Sent: Thursday, September 8, 2022 4:55 PM
To: Bennett, Bradley
Subject: [External] RE: Permit Renewal for Danbury WWTP - NCO082384
CAUTION: External email. Do not click links or open attachments unless you verify. Send all suspicious email as an attachment to
Report Spam.
Bradley,
Electronic documents are acceptable.
Thanks Stewart
From: Bennett, Bradley <[e-mail]>
Sent: Tuesday, September 6, 2022 7:40 PM
To: Stewart Easter <[e-mail]>
Cc: [e-mail]
Subject: Permit Renewal for Danbury WWTP - NCO082384
CAUTION: This email originated from outside of the County Network. Do not click links or open attachments unless you
recognize the sender and know the content is safe.
Mr. Easter,
I am the permit writer working with the draft of your permit renewal for the Danbury WWTP (NC0082384). I hope to
have the draft ready for public notice in the next few week. Below is information related to some of our procedures
now for processing permit information through electronic delivery. Please review this information and let me know if
you have any questions about this our your permit renewal.
In order to provide more convenience, control, and security to our permittees and assist them in processing their
transactions, The Division of Water Resources is currently transitioning towards electronic correspondence. This will
hopefully provide more efficient service to our permittees and other partners and will allow us to more effectively
process and track documents. We are writing to ask you for your approval of the transmittal of documents related to
your permitting and related activities with the Division in an electronic format. Documents will be emailed to the
appropriate contact person(s) in your organization in a PDF format.
Please respond to me through this email with verification that transmittal of your documents in an electronic manner
is acceptable to you. If you have any questions, please feel free to contact me.
Bradley Bennett
Compliance and Expedited Permitting
NC Division of Water Resources
1617 Mail Service Center Email: [e-mail]
Raleigh, NC 27699-1617
Email correspondence to and from this address may be subject to public records laws
DISCLAIMER : Email correspondence to and from this sender is subject to the N.C. Public Records Law and may be
disclosed to third parties.

Bennett, Bradley
From: Graznak, Jenny
Sent: Tuesday, August 23, 2022 8:20 AM
To: Bennett, Bradley
Subject: RE: Next Renewal For Review - Stokes County - Danbury WWTP - NC0082384
Not necessarily issues with the renewal. But the last inspection our office did in February indicates composite sampler
failed and flow meter not calibrated and some other issues. I would like to have someone follow up on those issue,
because that inspector is no longer with us and never followed up, obviously. No need to hold off on renewal though.
Jenny Graznak
Assistant Regional Supervisor
Winston Salem Regional Office
Division of Water Resources
Department of Environmental Quality
450 West Hanes Mill Road, Suite 300
Winston Salem NC 27105
336-776-9695 office
336-403-7388 mobile
[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: Bennett, Bradley <[e-mail]>
Sent: Monday, August 22, 2022 12:06 PM
To: Graznak, Jenny <[e-mail]>
Subject: RE: Next Renewal For Review - Stokes County - Danbury WWTP - NC0082384
Hey Jenny,
You mentioned that there were some issues with this renewal this morning. Sounded like you may want to be able to go
back out to this one before the renewal? Looks like the last inspection was in February 2022. Do you want to set up a
meeting to discuss this one? You want me to hold off on it for a while? Let me know what you would like to do.
Thanks
m
Bradley Bennett
Compliance and Expedited Permitting
NC Division of Water Resources
1617 Mail Service Center
Raleigh, NC 27699-1617
Email: [e-mail]

Email correspondence to and from this address may be subject to public records laws
From: Bennett, Bradley
Sent: Thursday, August 18, 2022 7:46 PM
To: Graznak, Jenny <[e-mail]>
Subject: Next Renewal For Review - Stokes County - Danbury WWTP - NCO082384
Hey Jenny,
Just wanted to give you a heads up that one of the next renewal I 'II be working on is for Danbury WWTP — NCO082384
in Stokes County. If you guys have any feedback on this one as I get started, please let me know.
Thanks
m
Bradley Bennett
Compliance and Expedited Permitting
NC Division of Water Resources
1617 Mail Service Center Email: [e-mail]
Raleigh, NC 27699-1617
Email correspondence to and from this address may be subject to public records laws

NH3/TRC WLA Calculations
Facility: Stokes County - Danbury WWTP
Permit No. NC0082384
Prepared By: Bradley Bennett
Enter Design Flow (MGD): 0.1
Enter s7Q10 (cfs): 55
Enter w7Q10 (cfs): 79
Total Residual Chlorine (TRC)
Daily Maximum Limit (ug/1)
s7Q10 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (UG/L)
Upstream Bkgd (ug/1)
IWC (%)
Allowable Conc. (ug/1)
Max Limit of 28
Fecal Coliform
Monthly Average Limit
(If DF >331; Monitor)
(If DF<331; Limit)
Dilution Factor (DF)
<= Permitted Flow if Different from Design
Ammonia (Summer)
Monthly Average Limit (mg NH3-N/1)
Design
Permitted
Design Permitted
55
s7Q10(CFS)
55
0.1
DESIGN FLOW (MGD)
0.1
0.155
DESIGN FLOW (CFS)
0.155
17.0
STREAM STD (MG/L)
1.0
0
Upstream Bkgd (mg/1)
0.22
0.28
IWC (%)
0.28
6049
Allowable Conc. (mg/1)
277.8
*28
*28
Ammonia (Winter)
Monthly Average Limit (mg NH3-N/1)
Design
Permitted
Design Permitted
w7Q10(CFS)
79
Not Required•,
#VALUE!
DESIGN FLOW (MGD)
0.1
DESIGN FLOW (CFS)
0.155
STREAM STD (MG/L)
1.8
355.84
#VALUE!
Upstream Bkgd (mg/1)
0.22
IWC (%)
0.20
Allowable Conc. (mg/1)
807.1
*2B .0404 (c) Applies
Total Residual Chlorine
1. Cap Daily Max limit at 28 ug/I to protect for acute toxicity
Ammonia (as NH3-N)
1. If Allowable Conc > 35 mg/l, Monitor Only
2. Monthly Avg limit x 3 = Weekly Avg limit (Municipals)
3. Monthly Avg limit x 5 = Daily Max limit (Non-Munis)
If the allowable ammonia concentration is > 35 mg/L, no limit shall be imposed
• By Policy dischargers < 1 MGD get limits no lower than 2 & 4 due to BAT
* From 2B .0404(c) - Winter Limits can be no less stringent than 2 times the summer limits
Fecal Coliform
1. Monthly Avg limit x 2 = 400/100 ml = Weekly Avg limit (Municipals) = Daily Max limit (Non -Muni)