NC0082384_Renewal (Application)_20210824

sre
ti ! . i
ROY COOPER _
Governor 5
ELIZABETH S.BISER .
Secretary
S.DANIEL SMITH NORTH CAROLINA
Director Environmental Quality
August 24, 2021
Stoke County
Attn: Stewart Easter, Public Works Dir.
PO Box 20
Danbury, NC 27016
Subject: Permit Renewal
Application No. NC0082384
Danbury WWTP
Stokes County
Dear Applicant:
The Water Quality Permitting Section acknowledges the August 24, 2021 receipt of your permit renewal application and
supporting documentation. Your application will be assigned to a permit writer within the Section's NPDES WW permitting
branch. Per G.S. 150E-3 your current permit does not expire until permit decision on the application is made.
Continuation of the current permit is contingent on timely and sufficient application for renewal of the current permit. The
permit writer will contact you if additional information is required to complete your permit renewal. Please respond in a
timely manner to requests for additional information necessary to allow a complete review of the application and renewal
of the permit.
Information regarding the status of your renewal application can be found online using the Department of Environmental
Quality's Environmental Application Tracker at:
https://dea.nc.gov/permits-regulations/permit-guidance/environmental-application-tracker
If you have any additional questions about the permit, please contact the primary reviewer of the application using the
links available within the Application Tracker.
Sincerely,
cM1
Wren Thedford
Administrative Assistant
Water Quality Permitting Section
cc: Mark Lacy-LKC Engineering, PLLC
ec: WQPS Laserfiche File w/application
DE Q 1/ North Carolina Department of Environmental Quality Division of Water Resources
v Winston-Salem Regional Office 450 West Hanes Mill Road.Suite 300 Winston-Salem.North Carolina 27105
/""' 336 776 9800

' En,veenng
LI
Landscape Architecture
Surveying
August 23, 2021
Mr. Michael Montebello, PE
Supervisor, NPDES Municipal Wastewater
Archdale Building—9' Floor
512 North Salisbury Street
Raleigh, NC 27604
Re: NPDES Permit Renewal — NC0082384
Danbury WWTP, Stokes County
Mr. Montebello,
On behalf of Stokes County, please find attached one (1) original and two (2) copies of the NPDES
renewal application for the Danbury WWTP (NC0082384), which is owned and operated by
Stokes County. Please note that the outfall location has been updated in this application, since it
was noted the that the outfall was shown in the wrong location in past applications.
If you have any questions, please do not hesitate to contact me at [phone] or by email at
[e-mail].
Sincerely,
LKC Engineering, PLLC
// 4
Mark Lacy, P.E.
RECEIVED
AUG 242021
NCDEQ/DWR/NPDES
LKC Engineering,PLLC,140 Aqua Shed Court,Aberdeen,North Carolina 28315
PH:910/420-1437*FAX: [phone]*License No.P-1095

US EPA APPLICATION FOR NPDES PERMIT RENEWAL TO
DISCHARGE WASTEWATER
DANBURY WWTP - STOKES COUNTY
ORIGINAL
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Prepared By
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Landscape Architecture
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LKC Engineering, PLLC
140 Aqua Shed Court
Aberdeen, North Carolina 28315
AUGUST 2021

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
NC0082384 DANBURY WWTP-STOKES CO OMB No.2040-0004
Form U.S.Environmental Protection Agency
ZA EPA Application for NPDES Permit to Discharge Wastewater
NPDES NEW AND EXISTING PUBLICLY OWNED TREATMENT WORKS
SECTION 1.BASIC APPLICATION INFORMATION FOR ALL APPLICANTS(40 CFR 122.21(j)(1)and (9))
1.1 Facility name
Danbury Wastewater Treatment Plant
Mailing address(street or P.O.box)
P.O.Box 20
City or town State ZIP code
o Danbury NC 27016
Contact name(first and last) Title Phone number Email address
8 Stewart Easter Public Utilities Director [phone] [e-mail]
Location address(street,route number,or other specific identifier) ❑Same as mailing address
NCSR 1562
w
City or town State ZIP code
Danbury NC 27016
1.2 Is this application for a facility that has yet to commence discharge?
❑ Yes 4 See instructions on data submission ✓❑ No
requirements for new dischargers.
1.3 Is applicant different from entity listed under Item 1.1 above?
❑ Yes ✓❑ No SKIP to Item 1.4.
Applicant name
Applicant address(street or P.O.box)
0
8
0 City or town State ZIP code
Contact name(first and last) Title Phone number Email address
a 1.4 Is the applicant the facility's owner,operator,or both?(Check only one response.)
❑ Owner 0 Operator ❑✓ Both
1.5 To which entity should the NPDES permitting authority send correspondence?(Check only one response.)
El Facility El Applicant
Facility and applicant
(they are one and the same)
1.6 Indicate below any existing environmental permits.(Check all that apply and print or type the corresponding permit
number for each.)
Existing Environmental Permits
R ✓❑ NPDES(discharges to surface ❑ RCRA(hazardous waste) ❑ UIC(underground injection
d
water) control)
E NC0082384
2 ❑ PSD(air emissions) ❑ Nonattainment program(CAA) ❑ NESHAPs(CM)
rn
N ❑ Ocean dumping(MPRSA) ❑ Dredge or fill(CWA Section ❑ Other(specify)
404)
EPA Form 3510-2A(Revised 3-19) Page 1

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
NC0082384 DANBURY WTP-STOKES CO OMB No.2040-0004
W
1.7 Provide the collection system information requested below for the treatment works.
Municipality Population 1 Collection System Type Ownership Status
Served Served (indicate percentage)
100 %separate sanitary sewer El Own 1U Maintain
I a) Danbury,NC 183 %combined storm and sanitary sewer 0 Own ❑ Maintain
d _ 0 Unknown 0 Own ❑ Maintain
c %separate sanitary sewer 0 Own ❑ Maintain
s °
•0 /°combined storm and sanitary sewer ❑ Own ❑ Maintain
ElUnknown 0 Own ❑ Maintain
0_
a %separate sanitary sewer ❑ Own ❑ Maintain
%combined storm and sanitary sewer 0 Own ❑ Maintain
E 0 Unknown 0 Own ❑ Maintain
a? %separate sanitary sewer ❑ Own 0 Maintain
rn %combined storm and sanitary sewer 0 Own 0 Maintain
0 Unknown ❑ Own ❑ Maintain
f) Total
°' Population 183
i_) Served
Separate Sanitary Sewer System Combined Storm and
Sanitary Sewer
Total percentage of each type of
sewer line(in miles) 100 0 %
z' 1.8 Is the treatment works located in Indian Country?
0
❑ Yes 0 No
U
c 1.9 Does the facility discharge to a receiving water that flows through Indian Country?
c ❑ Yes 0 No
1.10 Provide design and actual flow rates in the designated spaces. Design Flow Rate
0.100 mgd
= Annual Average Flow Rates(Actual)
U N
a cu Two Years Ago Last Year This Year
13 CC
MI
0 0.035 mgd 0.039 mgd 0.0356 mgd
rn LL
d Maximum Daily Flow Rates(Actual)
ci
Two Years Ago Last Year This Year
0.099 mgd 0.0895 mgd 0.1195 mgd
y 1.11 Provide the total number of effluent discharge points to waters of the United States by type
.o Total Number of Effluent Discharge Points by Type
c_ Constructed
cv Combined Sewer
E Treated Effluent Untreated Effluent Overflows Bypasses Emergency
- - Overflows
0 _--- - -- --------
N_
0 1 0 0 0 0
EPA Farm 35'2-2 '3_..2e2 _ Page 2

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
NC0082384 DANBURY WWTP-STOKES CO OMB No.2040-0004
Outfalls Other Than to Waters of the United States
1.12 Does the POTW discharge wastewater to basins,ponds,or other surface impoundments that do not have outlets for
discharge to waters of the United States?
❑ Yes ❑✓ No 4 SKIP to Item 1.14.
1.13 Provide the location of each surface impoundment and associated discharge information in the table below.
Surface Impoundment Location and Discharge Data
Average Daily Volume Continuous or Intermittent
Location Discharged to Surface
Impoundment (check one)
❑ Continuous
gpd ❑ Intermittent
❑ Continuous
gpd ❑ Intermittent
❑ Continuous
gpd 0 Intermittent
2 1.14 Is wastewater applied to land?
❑ Yes ❑✓ No4SKIPtoItem1.16.
O 1.15 Provide the land application site and discharge data requested below.
O Land Application Site and Discharge Data
Continuous or
Location Size Average Daily Volume Intermittent
Applied (check one)
acresgpd ❑ Continuous
❑ Intermittent
s acresgpd 0 Continuous
o 0 Intermittent
acres d ❑ Continuous
gp 0 Intermittent
R 1.16 Is effluent transported to another facility for treatment prior to discharge?
o ❑ Yes m No 4 SKIP to Item 1.21.
1.17 Describe the means by which the effluent is transported(e.g.,tank truck,pipe).
1.18 Is the effluent transported by a party other than the applicant?
❑ Yes ❑ No 4 SKIP to Item 1.20.
1.19 Provide information on the transporter below.
Transporter Data
Entity name Mailing address(street or P.O.box)
City or town State ZIP code
Contact name(first and last) Title
Phone number Email address
EPA Form 3510-2A(Revised 3-19) Page 3

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
NC0082384 DANBURY WWTP-STOKES CO OMB No.2040-0004
1.20 In the table below,indicate the name,address,contact information,NPDES number,and average daily flow rate of the
receiving facility.
Receiving Facility Data
Facility name Mailing address(street or P.O.box)
•E" City or town State ZIP code
0
U
Contact name(first and last) Title
0
Phone number Email address
o0 NPDES number of receiving facility(if any) 0 None
Average daily flow rate mgd
U)
1.21 Is the wastewater disposed of in a manner other than those already mentioned in Items 1.14 through 1.21 that do not
have outlets to waters of the United States(e.g.,underground percolation,underground injection)?
cp
t ❑ Yes ❑✓ No 4 SKIP to Item 1.23.
N
1.22 Provide information in the table below on these other disposal methods.
s Information on Other Disposal Methods
5 Disposal Location of Size of Annual Average Continuous or Intermittent
-0 Method Daily Discharge
I >= Disposal Site Disposal Site (check one)
Description p p Volume
❑ Continuous
acres gpd 0 Intermittent
❑ Continuous
acres gpd ❑ Intermittent
acresgpd ❑ Continuous
❑ Intermittent
1.23 Do you intend to request or renew one or more of the variances authorized at 40 CFR 122.21(n)?(Check all that apply.
C Consult with your NPDES permitting authority to determine what information needs to be submitted and when.)
A ❑ Discharges into marine waters(CWA ❑ Water quality related effluent limitation(CWA Section
AI Section 301(h)) 302(b)(2))
❑✓ Not applicable
1.24 Are any operational or maintenance aspects(related to wastewater treatment and effluent quality)of the treatment works
the responsibility of a contractor?
❑✓ Yes ❑ No*SKIP to Section 2.
1.25 Provide location and contact information for each contractor in addition to a description of the contractor's operational
and maintenance responsibilities.
Contractor Information
Contractor 1 Contractor 2 Contractor 3
o Contractor name
Pace Analytical
(company name) _
Mailing address
c (street or P.O.box) 1377 South Park Drive
City,state,and ZIP Kernersville,NC,27284
code
c� lastCon) Clifford name(first and Clifford Cain
Phone number [phone]
Email address [e-mail]
Operational and
maintenance Weekday operations,
responsibilities of sampling,notification to
contractor owner and services
EPA Form 3510-2A(Revised 3-19) Page

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
NC0082384 DANBURY WWTP-STOKES CO OMB No.2040-0004
SECTION 2.ADDITIONAL INFORMATION(40 CFR 122.21(j)(1)and(2))
o Outfalls to Waters of the United States
2.1 Does the treatment works have a design flow greater than or equal to 0.1 mgd?
❑✓ Yes ❑ No 4 SKIP to Section 3.
0 2.2 Provide the treatment works'current average daily volume of inflow Average Daily Volume of Inflow and Infiltration
and infiltration.
6080.0 gpd
Indicate the steps the facility is taking to minimize inflow and infiltration.
No actions being pursued
0
c
:E2.3 Have you attached a topographic map to this application that contains all the required information?(See instructions for
co 0. specific requirements.)
(a
0
✓❑ Yes ❑ No
E 2.4 Have you attached a process flow diagram or schematic to this application that contains all the required information?
t° (See instructions for specific requirements.)
0 0,
c ❑✓ Yes ❑ No
2.5 Are improvements to the facility scheduled?
❑ Yes ❑✓ No 4 SKIP to Section 3.
Briefly list and describe the scheduled improvements.
0
E'
1.
E
Q 2.
E
0
3.
U)
4.
2.6 Provide scheduled or actual dates of completion for improvements.
• Scheduled or Actual Dates of Completion for Improvements
E Affected Attainment of
Scheduled Begin End Begin
Outfalls Operational
Improvement Construction Construction Discharge
(from above) (list outfall (MM/DD/YYYY) (MM/DDM YY) (MM/DD/YYYY) Level
number) (MM/DD/YYYY)
1.
L
to 2.
3.
4.
2.7 Have appropriate permits/clearances concerning other federal/state requirements been obtained?Briefly explain your
response.
❑ Yes ❑ No ❑ None required or applicable
Explanation:
EPA Form 3510-2A(Revised 3-19) Page 5

EPA Identification Number NPDES Permit Number Facility Name Fomi Approved 03/05/19
NC0082384 DANBURY WWTP-STOKES CO OMB No.2040-0004
SECTION 3.INFORMATION ON EFFLUENT DISCHARGES(40 CFR 122.21(j)(3)to(5))
3.1 Provide the following information for each outfall.(Attach additional sheets if you have more than three outfalls.)
Outfall Number o01 Outfall Number Outfall Number
State NC
o County Stokes
w
City or town Danbury
w
0
o Distance from shore o ft. ft. ft.
a.
IL-
IL-0 Depth below surface o ft. ft. ft.
c
Average daily flow rate 0.0356 mgd mgd mgd
I II
Latitude 36° 24' 33" N ° "' °
Longitude -80° 11' 45" W °
3.2 Do any of the outfalls described under Item 3.1 have seasonal or periodic discharges?
1 RI
o ❑ Yes ✓❑ No 4 SKIP to Item 3.4.
0
a 3.3 If so,provide the following information for each applicable outfall.
t
u) Outfall Number Outfall Number Outfall Number
c
0 Number of times per year
c discharge occurs
a Average duration of each
o discharge(specify units)
oAverage flow of each mgd mgd mgd
0 discharge
ea
cow Months in which discharge
occurs
3.4 Are any of the outfalls listed under Item 3.1 equipped with a diffuser?
❑ Yes ❑✓ No+SKIP to Item 3.6.
3.5 Briefly describe the diffuser type at each applicable outfall.
i- Outfall Number Outfall Number Outfall Number
0
a
0
g
G
c Does the treatment works discharge or plan to discharge wastewater to waters of the United States from one or more
d = 3.6 discharge points?
3 w ❑ Yes 0 No+SKIP to Section 6.
EPA Form 3510-2A(Revised 3-19) Page 6

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
NC0082384 DANBURY WWTP-STOKES CO OMB No.2040-0004
3.7 Provide the receiving water and related information(if known)for each outfall.
Outfall Number 001 Outfall Number Outfall Number
Receiving water name Dan River
Name of watershed,river,
0 or stream system Upper Dan
U.S.Soil Conservation
Service 14-digit watershed 03010103170050
o code
Name of state Roanoke
management/river basin
U.S.Geological Survey
8-digit hydrologic 03010103
CD cataloging unit code
Critical low flow(acute) 55 cfs cfs cfs
Critical low flow(chronic) cfs cfs cfs
Total hardness at critical mg/L of mg/L of mg/L of
low flow 25 CaCO3 CaCO3 CaCO3
3.8 Provide the following information describing the treatment provided for discharges from each outfall.
Outfall Number 001 Outfall Number Outfall Number
Highest Level of 0 Primary ❑ Primary 0 Primary
Treatment(check all that ❑ Equivalent to ❑ Equivalent to ❑ Equivalent to
apply per outfall) secondary secondary secondary
O Secondary ❑ Secondary ❑ Secondary
❑ Advanced ❑ Advanced ❑ Advanced
❑ Other(specify) ❑ Other(specify) ❑ Other(specify)
c
0 -
n Design Removal Rates by
Outfall 001
BOD5 or CBODs 85
cc: TSS 85 %
r-
0 Not applicable 0 Not applicable ❑Not applicable
Phosphorus % o 0
/o /o
0 Not applicable ❑Not applicable 0 Not applicable
Nitrogen o o
Other(specify) 0 Not applicable ❑Not applicable ❑Not applicable
EPA Form 3510-2A(Revised 3-19) Page 7

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
NC0082384 DANBURY WWTP-STOKES CO OMB No.2040-0004
3.9 Describe the type of disinfection used for the effluent from each outfall in the table below. If disinfection varies by
season,describe below.
-o Effluent is disinfected in dual UV chambers designed explicitly for disinfecting treated wastewater
m
c
0
U
Outfall Number 001 Outfall Number Outfall Number
0
Disinfection type
Ultra Violet Light exposure
a
as
Seasons used
All
Dechlorination used? ❑✓ Not applicable 0 Not applicable ❑ Not applicable
❑ Yes ❑ Yes 0 Yes
❑ No 0 No ❑ No
3.10 Have you completed monitoring for all Table A parameters and attached the results to the application package?
❑ Yes 0 No
3.11 Have you conducted any WET tests during the 4.5 years prior to the date of the application on any of the facility's
discharges or on any receiving water near the discharge points?
❑ Yes ✓❑ No 4 SKIP to Item 3.13.
3.12 Indicate the number of acute and chronic WET tests conducted since the last permit reissuance of the facility's
discharges by outfall number or of the receiving water near the discharge points.
Outfall Number Outfall Number Outfall Number
Acute Chronic Acute Chronic Acute Chronic
Number of tests of discharge
water
Number of tests of receiving
water
3.13 Does the treatment works have a design flow greater than or equal to 0.1 mgd?
❑✓ Yes ❑ No 4 SKIP to Item 3.16.
c 3.14 Does the POTW use chlorine for disinfection,use chlorine elsewhere in the treatment process,or otherwise have
reasonable potential to discharge chlorine in its effluent?
❑ Yes 4 Complete Table B,including chlorine. ❑ No 4 Complete Table B,omitting chlorine.
3.15 Have you completed monitoring for all applicable Table B pollutants and attached the results to this application
package? Few components of Table B were
❑✓ Yes required to be measured by the permit ❑ No
3.16 Does one or more of the following conditions apply?
• The facility has a design flow greater than or equal to 1 mgd.
• The POTW has an approved pretreatment program or is required to develop such a program.
• The NPDES permitting authority has informed the POTW that it must sample for the parameters in Table C,must
sample other additional parameters(Table D),or submit the results of WET tests for acute or chronic toxicity for
each of its discharge outfalls(Table E).
Yes 4 Complete Tables C,D,and E as
❑ applicable. 0No 4 SKIP to Section 4.
3.17 Have you completed monitoring for all applicable Table C pollutants and attached the results to this application
package?
❑ Yes ❑ No
3.18 Have you completed monitoring for all applicable Table D pollutants required by your NPDES permitting authority and
attached the results to this application package?
El Yes ❑ No additional sampling required by NPDES
permitting authority.
EPA Form 3510-2A(Revised 3-19) Page 8

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
NC0082384 DANBURY WWTP-STOKES CO OMB No.2040-0004
3.19 Has the POTW conducted either(1)minimum of four quarterly WET tests for one year preceding this permit application
or(2)at least four annual WET tests in the past 4.5 years?
❑ Yes ❑ No 4 Complete tests and Table E and SKIP to
Item 3.26.
3.20 Have you previously submitted the results of the above tests to your NPDES permitting authority?
❑ Yes ❑ No 4 Provide results in Table E and SKIP to
Item 3.26.
3.21 Indicate the dates the data were submitted to your NPDES permitting authority and provide a summary of the results.
Date(s)Submitted Summary of Results
(MM/DD/YYYY)
c
C
0
R 3.22 Regardless of how you provided your WET testing data to the NPDES permitting authority,did any of the tests result in
o toxicity?
❑ Yes ❑ No 4 SKIP to Item 3.26.
121 3.23 Describe the cause(s)of the toxicity:
C
w
3.24 Has the treatment works conducted a toxicity reduction evaluation?
❑ Yes ❑ No 4 SKIP to Item 3.26.
3.25 Provide details of any toxicity reduction evaluations conducted.
3.26 Have you completed Table E for all applicable outfalls and attached the results to the application package?
El Yes ❑ Not applicable because previously submitted
information to the NPDES permittin. authorit
SECTION 4.INDUSTRIAL DISCHARGES AND HAZARDOUS WASTES(40 CFR 122.21(j)(6)and(7))
4.1 Does the POTW receive discharges from SIUs or NSCIUs?
❑ Yes ❑✓ No 4 SKIP to Item 4.7.
d 4.2 Indicate the number of SIUs and NSCIUs that discharge to the POTW.
Number of SIUs Number of NSCIUs
U)
0
4.3 Does the POTW have an approved pretreatment program?
❑ Yes ❑ No
g 4.4 Have you submitted either of the following to the NPDES permitting authority that contains information substantially
identical to that required in Table F:(1)a pretreatment program annual report submitted within one year of the
application or(2)a pretreatment program?
❑ Yes ❑ No 4 SKIP to Item 4.6.
75 4.5 Identify the title and date of the annual report or pretreatment program referenced in Item 4.4.SKIP to Item 4.7.
4.6 Have you completed and attached Table F to this application package?
❑ Yes ❑ No
EPA Form 3510-2A(Revised 3-19) Page 9

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
NC0082384 DANBURY WWTP-STOKES CO OMB No.2040-0004
4.7 Does the POTW receive,or has it been notified that it will receive,by truck,rail,or dedicated pipe,any wastes that are
regulated as RCRA hazardous wastes pursuant to 40 CFR 261?
❑ Yes No 4 SKIP to Item 4.9.
4.8 If yes.provide the following information:
Annual
Hazardous Waste Waste Transport Method Amount of Units
Number (check all that apply) Waste
Received
❑ Truck ❑ Rail
❑ Dedicated pipe ❑ Other(specify)
.42
U
El Truck ❑ Rail
❑ Dedicated pipe ❑ Other(specify)
0
N ❑ Truck ❑ Rail
El Dedicated pipe ❑ Other(specify)
R 4.9 Does the POTW receive,or has it been notified that it will receive,wastewaters that originate from remedial activities,
including those undertaken pursuant to CERCLA and Sections 3004(7)or 3008(h)of RCRA?
R ❑ Yes ✓❑ No 4 SKIP to Section 5.
4.10 Does the POTW receive(or expect to receive)less than 15 kilograms per month of non-acute hazardous wastes as
0 specified in 40 CFR 261.30(d)and 261.33(e)?
❑ Yes 4 SKIP to Section 5. ❑ No
4.11 Have you reported the following information in an attachment to this application:identification and description of the
site(s)or facility(ies)at which the wastewater originates;the identities of the wastewater's hazardous constituents;and
the extent of treatment,if any,the wastewater receives or will receive before entering the POTW?
❑ Yes ❑ No
SECTION 5.COMBINED SEWER OVERFLOWS(40 CFR 122.21(j)(8))
5.1 Does the treatment works have a combined sewer system?
❑ Yes ❑� No 4SKIP to Section 6.
5.2 Have you attached a CSO system map to this application?(See instructions for map requirements.)
❑ Yes ❑ No
5.3 Have you attached a CSO system diagram to this application?(See instructions for diagram requirements.)
❑ Yes ❑ No
EPA Form 3510-2A(Revised 3-19) Page 10

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
NC0082384 DANBURY WWTP-STOKES CO OMB No.2040-0004
5.4 For each CSO outfall,provide the following information. (Attach additional sheets as necessary.)
CSO Outfall Number CSO Outfall Number CSO Outfall Number
City or town
0
State and ZIP code
U
N
o County
m
5 Latitude " ° „
0
0 a
ci Longitude °
Distance from shore ft. ft. ft.
Depth below surface ft. ft. ft.
5.5 Did the POTW monitor any of the following items in the past year for its CSO outfalls?
CSO Outfall Number CSO Outfall Number CSO Outfall Number
Rainfall ❑Yes ❑ No El Yes 0 No Cl Yes ❑No
0)
C
0 CSO flow volume ❑Yes 0 No ❑Yes 0 No 0 Yes ❑No
CSO pollutant ❑Yes ❑No ❑Yes ❑ No 0 Yes ❑ No
o concentrations
co
0 Receiving water quality 0 Yes ❑No 0 Yes ❑ No 0 Yes ❑ No
CSO frequency 0 Yes 0 No El Yes 0 No ❑ Yes ❑ No
Number of storm events 0 Yes ❑No El Yes 0 No 0 Yes 0 No
5.6 Provide the following information for each of your CSO outfalls.
CSO Outfall Number CSO Outfall Number 1 CSO Outfall Number
} Number of CSO events in events events events
17) the past year
a
c Average duration per hours hours hours
w event 0 Actual or 0 Estimated ❑Actual or 0 Estimated ❑Actual or 0 Estimated
1 N
o Average volume per event million gallons million gallons million gallons
cn
0 0 Actual or❑Estimated 0 Actual or❑Estimated ❑Actual or❑Estimated
Minimum rainfall causing inches of rainfall inches of rainfall inches of rainfall
a CSO event in last year 0 Actual or❑Estimated ❑Actual or❑Estimated ❑Actual or❑Estimated
EPA Form 3510-2A(Revised 3-19) Page 11

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
NC0082384 DANBURY WWTP-STOKES CO OMB No.2040-0004
5.7 Provide the information in the table below for each of your CSO outfalls.
CSO Outfall Number CSO Outfall Number_ CSO Outfall Number
Receiving water name
Name of watershed/
stream system
U.S.Soil Conservation ❑Unknown ❑Unknown 0 Unknown
Service 14-digit
watershed code
(if known)
Name of state
0
management/river basin
co U.S.Geological Survey 0 Unknown 0 Unknown ElUnknown
8-Digit Hydrologic Unit
Code(if known)
Description of known
water quality impacts on
receiving stream by CSO
(see instructions for
exam Iles
SECTION 6.CI-CKLIST AND CERTIFICATION STATEMENT(40 CFR 122.22(a)and(d))
6.1 In Column 1 below, mark the sections of Form 2A that you have completed and are submitting with your application. For
each section,specify in Column 2 any attachments that you are enclosing to alert the permitting authority.Note that not
all applicants are required to provide attachments.
Column 1 Column 2
❑ Section 1: Basic Application ❑ wl variance request(s) ❑ w/additional attachments
Information for All Applicants
❑ Section 2:Additional w/topographic map ✓❑ wl process flow diagram
Information
❑ w/additional attachments
✓❑ wl Table A ❑ w/Table D
❑ Section 3: Information on w/Table B ❑ w/Table E
Effluent Discharges
❑ w/Table C ❑ wl additional attachments
Section 4:Industrial ❑ w/SIU and NSCIU attachments ❑ w/Table F
❑ Discharges and Hazardous
s Wastes ❑ w/additional attachments
❑ Section 5:Combined Sewer El w/CSO map El w/additional attachments
UOverflows ❑ w/CSO system diagram
❑ Section 6:Checklist and ❑ w/attachments
In
Certification Statement
Yl
Y 6.2 Certification Statement
V
I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in
accordance with a system designed to assure that qualified personnel properly gather and evaluate the information
submitted.Based on my inquiry of the person or persons who manage the system,or those persons directly responsible
for gathering the information,the information submitted is,to the best of my knowledge and belief,true,accurate,and
complete.I am aware that there are significant penalties for submitting false information,including the possibility of fine
and imprisonment for knowing violations.
Name
a(print or type first and last name) Official title
kAbd- < ��E�vQ)�1C �C �(PCtdf
Signs ure Date si ned
A741-4-"at--/—
EPA Form 3510-2A(Revised 3-19) Page 12

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
NC0082384 DANBURY WWTP-STOKES CO 001 OMB No.2040-0004
TABLE A.EFFLUENT PARAMETERS FOR ALL POTWS
Maximum Daily Discharge Average Daily Discharge Analytical ML or MDL
Pollutant
Value Units Value Units Number of Method' (include units)
Samples
Biochemical oxygen demand
i BOD5 or LiCBOD5 22.2 mg 02/L 4.42 mg 02/L 226 SM5210B ❑ML
(report one) ❑MDL
Fecal coliform 2420 #/100m1 4.18 Geo Mean#/100m1 233 SM9222D ❑ML
0 MDL
Design flow rate 0.203 MGD 0.033 MGD 1574
pH(minimum) 5.8 pH units
pH(maximum) 7.5 pH units
Temperature(winter) 23.7 degrees C 11.1 degree C 810
Temperature(summer) 25.9 degrees C 20.7 degree C 762
Total suspended solids(TSS) 205 mg/L 7.93 mg/L 226 SM2540D El ML
❑MDL
1 Sampling shall be conducted according to sufficiently sensitive test procedures(i.e.,methods)approved under 40 CFR 136 for the analysis of pollutants or pollutant parameters or
required under 40 CFR chapter I,subchapter N or 0.See instructions and 40 CFR 122.21(e)(3).
EPA Form 3510-2A(Revised 3-19) Page 13

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
NC0082384 DANBURY WWTP-STOKES CO 001 OMB No.2040-0004
TABLE B.EFFLUENT PARAMETERS FOR ALL POTWS WITH A FLOW EQUAL TO OR GREATER THAN 0.1 MGD
Maximum Daily Discharge Average Daily Discharge Analytical ML or MDL
Pollutant Number of Method' (include units)
Value Units Value Units SamplesEi ML
Ammonia(as N) 19 4 mg/L 1.56 mg/L 226 EPA 350.1 0 MDL
Chlorine ❑ML
N/A N/A
(total residual,TRC)2 ❑MDL
0 ML
Dissolved oxygen ❑MDL
Nitrate/nitrite ❑ML
❑MDL
0 ML
Kjeldahl nitrogen 0 MDL
0 ML
Oil and grease ❑MDL
0 ML
Phosphorus 6.46 mg/L 3.45 mg/L 18 EPA 365.4 0 MDL
Total dissolved solids 0 ML
❑MDL
' Sampling shall be conducted according to sufficiently sensitive test procedures(i.e.,methods)approved under 40 CFR 136 for the analysis of pollutants or pollutant parameters or
required under 40 CFR chapter I,subchapter N or 0.See instructions and 40 CFR 122.21(e)(3).
2 Facilities that do not use chlorine for disinfection,do not use chlorine elsewhere in the treatment process,and have no reasonable potential to discharge chlorine in their effluent are not
required to report data for chlorine.
EPA Form 3510-2A(Revised 3-19) Page 15

LOCATION MAP AND
TOPOGRAPHIC MAP

Stokes County - Danbury WWTP
N NPDES Permit # NC0082384
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PROCESS FLOW DIAGRAM, HYDRAULIC PROFILE
AND PROCESS DESCRIPTION

REVISIONS
SYM. DESCRIPTION DATE BY
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DAN3URY WWTP PLAN VIEW WITH
WATER 3ALANCE NOTATION
NOTE: INFLUENT HELD IN AERATED
EQUALIZATION BASIN PRIOR TO
INTRODUCTION TO TREATMENT TRAIN

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DANBURY WWTP Engineering 1Abe deen,NC z Court
5 NPDES No. NC0082384 HYDRAULIC PROFILE Landscape Architecture O:910.420.1437
W STOKES COUNTY,NORTH CAROLINA F:910.637.0096
r —I Planning Ikcengineering.com
o License No.P-1095

Danbury WWTP
Water Balance Narrative 8/11/2021
1. Wastewater enters the Danbury WWTP from the influent PS via a 6 inch force main,and
discharges to the Flow Equalization (EQ)tank.
2. Pumps in the EQ tank then transfer raw wastewater to the bar screen.
3. After passing the bar screen the entire flow, "Q", is equally split into the 2 plant aeration
tanks,0.5 Q to each tank.The tanks are aerated with 3-15 HP blowers,one acts as standby.
The influent flow averages 0.033 MGD.
4. After aeration the split flow of Mixed Liquor(ML) moves into its associated clarifier.
5. In the clarifier, half of the flow falls over the effluent weir while the other half is recycled
back to the head of the aeration tank(RAS).Typical flow values for the recycle stream are
the same as the influent flow to the aeration basin, in this two-channel plant it would be 0.5
Q.The result is that the influent flow to one aeration basin (0.5 Q), plus the RAS flow(0.5 Q),
are added together to make a ML clarifier feed flow of 1.0 Q.
6. The two clarifier weir overflows combine in the weir trough to makeup the plant effluent.
The effluent passes through the 2 of the 3 UV disinfection units(one reserved as standby)
and falls into the effluent PS.The effluent is pumped via a 6"force main to the Dan River
discharge site.
7. There are no side streams or overflows that escape the treatment works.All of the water
that enters the plant in the influent eventually exits the plant in the effluent stream.A small
amount of water is hauled away in the thickened sludge periodically but amounts to no
more than a few gallons per day.