NC0083551_Renewal (Application)_20220822

ROY COOPER x•
Governor
ELIZABETH S.BISER -^.--•
Secretory
RICHARD E.ROGERS,JR. NORTH CAROLINA
Director Environmental Quality
August 22, 2022
ONWASA
Attn: David M. Mohr, P.E.
228 Georgetown Rd
Jacksonville, NC 28540
Subject: Permit Renewal
Application No. NC0083551
Dixon WTP
Onslow County
Dear Applicant:
The Water Quality Permitting Section acknowledges the August 22, 2022, 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://deq.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.
Sincere)
Wren Thedford
Administrative Assistant
Water Quality Permitting Section
ec: WQPS Laserfiche File w/application
North Carolina Department of Environmental Quality I Division of Water Resources
GD_E
Wilmington Regional Office 127 Cardinal Drive E><tensfon Wilmington,North Carolina 28405
910.796.7215

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
110006674679 NC0083551 Dixon WTP OMB No.2040-0004
Form U.S.Environmental Protection Agency
2A 4/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
Dixon Water Treatment Plant
Mailing address(street or P.O.box)
228 Georgetown Road
City or town State ZIP code
o Jacksonville North Carolina 28540
Contact name(first and last) Title Phone number Email address
James McDonnel WTP Supervisor/ORC [phone] [e-mail]
Location address(street,route number,or other specific identifier) D Same as mailing address
c"c 6661 Wilmington Highway (''
City or town State ZIRECEIVE V
Sneads Ferry North Carolina 28460
1.2 Is this application for a facility that has yet to commence discharge? AUG 2 2 ZOZ2
❑ Yes 4 See instructions on data submission ❑✓ No
requirements for new dischargers. NCDEQ/DWRINPDES
1.3 Is applicant different from entity listed under Item 1.1 above?
✓❑ Yes ❑ No-4 SKIP to Item 1.4.
Applicant name
Onslow Water and Sewer Authority
Applicant address(street or P.O.box)
228 Georgetown Road •
oCity or town State ZIP code
Jacksonville North Carolina 28540
cts Contact name(first and last) Title Phone number Email address
David Mohr Chief Operations Officer [phone] [e-mail]
1.4 Is the applicant the facility's owner,operator,or both?(Check only one response.)
❑ Owner ❑ Operator ❑✓ Both
1.5 To which entity should the NPDES permitting authority send correspondence?(Check only one response.)
El Facility ❑✓ 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.)
a`.) Existing Environmental Permits
a.
NPDES(discharges to surface ❑ RCRA(hazardous waste) ❑ UIC(underground injection
water) control)
E NC0083551
a ❑ PSD(air emissions) ❑ Nonattainment program(CM) ❑ 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
110006674679 NC0083551 Dixon WTP OMB No.2040-0004
1.7 Provide the collection system information requested below for the treatment works.
Municipality Population Collection System Type Ownership Status
Served Served (indicate percentage)
separate sanitary sewer ❑ Own 0 Maintain
ZN/A-WTP %combined storm and sanitary sewer 0 Own CIMaintain
d ❑ Unknown ❑ Own ❑ Maintain
cn
%separate sanitary sewer ❑ Own 0 Maintain
g %combined storm and sanitary sewer ❑ Own ❑ Maintain
-5 ❑ Unknown 0 Own ❑ Maintain
a %separate sanitary sewer ❑ Own ❑ Maintain
-a %combined storm and sanitary sewer 0 Own ❑ Maintain
'° 0 Unknown 0 Own ❑ Maintain
E %separate sanitary sewer ❑ Own ❑ Maintain
> %combined storm and sanitary sewer ❑ Own El Maintain
cn
c ❑ Unknown 0 Own ❑ Maintain
'� Total
w Population
v Served
Separate Sanitary Sewer System Combined Storm and
Sanitary Sewer
Total percentage of each type of °
sewer line(in miles) 10o /0 o °�°
?' 1.8 Is the treatment works located in Indian Country?
o 0 Yes ❑✓ No
U
R 1.9 Does the facility discharge to a receiving water that flows through Indian Country?
c 0 Yes ❑✓ No
1.10 Provide design and actual flow rates in the designated spaces. Design Flow Rate
0.471 mgd
0 (I) Annual Average Flow Rates(Actual)
Two Years Ago Last Year This Year
03
ICI
0 0.384 mgd 0.435 mgd 0.411 mgd
Maximum Daily Flow Rates(Actual)
o Two Years Ago Last Year This Year
0.905 mgd 0.926 mgd 0.890 mgd
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
0_ a Constructed
a'1- Treated Effluent Untreated Effluent Combined Sewer Bypasses Emergency
-0ns Overflows Overflows
U -
u,
0 0 1 0 0 0
EPA Form 3510-2A(Revised 3-19) Page 2
1

r .
EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
110006674679 NC0083551 Dixon TP OMB No.2040-0004
W
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)
N/A ❑ Continuous
gpd 0 Intermittent
❑ Continuous
gpd ❑ Intermittent
❑ Continuous
gpd 0 Intermittent
2 1.14 Is wastewater applied to land?
❑ Yes ❑✓ No 4 SKIP to Item 1.16.
0 1.15 Provide the land application site and discharge data requested below.
Land Application Site and Discharge Data
o Continuous or
Location Size Average Daily Volume Intermittent
rn Applied (check one)
N/A acres d El Continuous
o gpd ❑ Intermittent
d El Continuous
acres
o gp 0 Intermittent
0 d 0 Continuous
acres
gp ❑ Intermittent
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).
N/A
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)
N/A
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
110006674679 NC0083551 Dixon WTP 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)
N/A
City or town State ZIP code
0
Contact name(first and last) Title
0
Phone number Email address
o NPDES number of receiving facility(if any) ❑None Average dailyflow rate mgd
9 9
0 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)?
L ElYes ❑✓ No 4 SKIP to Item 1.23.
0 1.22 Provide information in the table below on these other disposal methods.
Information on Other Disposal Methods
oDisposal Location of Size of Annual Average Continuous or Intermittent
Method Disposal Site Disposal Site Daily Discharge (check one)
Description Volume
❑ Continuous
N/A acres gpd ❑ Intermittent
❑ Continuous
acres gpd ❑ Intermittent
acres gpd ❑ 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.
„ r Consult with your NPDES permitting authority to determine what information needs to be submitted and when.)
❑ Discharges into marine waters(CWA ❑ Water quality related effluent limitation(CWA Section
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 contractors operational
and maintenance responsibilities.
Contractor Information
Contractor 1 Contractor 2 Contractor 3
o Contractor name N/A
(company name)
o Mailing address
(street or P.O.box)
o City,state,and ZIP
R code
oContact name(first and
last)
Phone number
Email address
Operational and
maintenance
responsibilities of
contractor
EPA Form 3510-2A(Revised 3-19) Page 4

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
110006674679 NC0083551 Dixon WTP OMB No.2040-0004
SECTION 2.ADDITIONAL INFORMATION(40 CFR 122.21(j)(1)and(2))
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?
a)
❑✓ 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
'R and infiltration.
o gpd
Indicate the steps the facility is taking to minimize inflow and infiltration.
Not applicable-Discharge is from a water treatment facility and not subject to I&I.
0
0
2.3 Have you attached a topographic map to this application that contains all the required information?(See instructions for
R rz specific requirements.)
o
0 ❑✓ Yes ❑ No
E 2.4 Have you attached a process flow diagram or schematic to this application that contains all the required information?
`` (See instructions for specific requirements.)
0 rn
o ❑✓ 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
;g 1.Accumulated sludge removal and replacement of HDPE liner in one settling lagoon.Remaining lagoons stay in service.
a�
E
a 2.
E
0
u, 3.
-a
C)
U
4.
U)
cu
2.6 Provide scheduled or actual dates of completion for improvements.
Scheduled or Actual Dates of Completion for Improvements
Affected Attainment of
Scheduled Begin End Begin
Outfalls Operational
2 Improvement Construction Construction Discharge
(from above) (list outfall (MM/DD/YYYY) (MM/DD/YYYY) (MM/DD/YYYY) Level
number) (MM/DD/YYYY)
1. 001 01/01/2023 04/01/2023
a
Cl) 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:
Contractor will be responsible for obtaining the necessary permits/approval upon award of the contract for this work.
EPA Form 3510-2A(Revised 3-19) Page 5

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
110006674679 NC0083551 Dixon WTP 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 001 Outfall Number Outfall Number
State North Carolina
County Onslow
C) City or town Sneads Ferry
g Distance from shore 0 ft. ft. ft.
Q
Depth below surface o ft. ft. ft.
Average daily flow rate o.411 mgd mgd mgd
Latitude 34° 34' 26" N
Longitude -77° 02' 12" W "
3.2 Do any of the outfalls described under Item 3.1 have seasonal or periodic discharges?
o ❑✓ Yes ❑ No-4 SKIP to Item 3.4.
R 3.3 If so,provide the following information for each applicable outfall.
N Outfall Number 001 Outfall Number Outfall Number
O
Number of times per year
o discharge occurs 365 days
a Average duration of each
o discharge(specify units) 18 hours/day
o Average flow of each 0.411 mgd mgd mgd
discharge
cL), Months in which discharge
OCCUfS Every month.
3.4 Are any of the outfalls listed under Item 3.1 equipped with a diffuser?
❑ Yes ❑✓ No 4 SKIP to Item 3.6.
3.5 Briefly describe the diffuser type at each applicable outfall.
Outfall Number Outfall Number Outfall Number
d
-
w
0
vi 3.6 Does the treatment works discharge or plan to discharge wastewater to waters of the United States from one or more
d discharge points?
❑� Yes ❑ No 4SKIP 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
110006674679 NC0083551 Dixon WTP 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 Stones Creek
Name of watershed,river,
0 or stream system White Oak
a- U.S.Soil Conservation
y Service 14-digit watershed HUC:030203020209
o code
w Name of state 1
i management/river basin White Oak River Basin
cn
U.S.Geological Survey
713 8-digit hydrologic 03020302
o
op cataloging unit code
Critical low flow(acute) --- cfs cfs cfs
Critical low flow(chronic) ___ cfs cfs cfs 1
Total hardness at critical mg/L of mg/L of mg/L of
low flow --- CaCO3 CaCO3 CaCO3
3.8 Provide the following information describing the treatment provided for discharges from each outfall.
Outfall Number ow Outfall Number Outfall Number
Highest Level of ❑ Primary ❑ Primary ❑ Primary
Treatment(check all that 0 Equivalent to 0 Equivalent to ❑ Equivalent to
apply per outfall) secondary secondary secondary
❑ Secondary ❑ Secondary 0 Secondary
❑ Advanced 0 Advanced 0 Advanced
0 Other(specify) 0 Other(specify) ❑ Other(specify)
c Settling only.
0
o Design Removal Rates by N/A
.c Outfall
t
d
o
BOD5 or CBOD5 N/A % % %
c
d
E:
m TSS N/A %
H
0 Not applicable ❑Not applicable 0 Not applicable
Phosphorus % %
l Not applicable ❑Not applicable ❑Not applicable
Nitrogen % % %
Other(specify) ❑Not applicable ❑Not applicable ❑Not applicable
yo % %
EPA Form 3510-2A(Revised 3-19) Page 7

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
110006674679 NC0083551 Dixon WTP 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.
a None-WTP discharge.
0
Outfall Number 001 Outfall Number Outfall Number
0
Disinfection type N/A
U)
G)
0
-• Seasons used N/A
Dechlorination used? ❑✓ Not applicable ❑ Not applicable ❑ Not applicable
❑ Yes ❑ Yes 0 Yes
❑ No ❑ 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 0 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 001 Outfall Number Outfall Number
Acute Chronic Acute Chronic Acute Chronic
Number of tests of discharge 18 0
water
Number of tests of receiving 0 0
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.
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.
6. 3.15 Have you completed monitoring for all applicable Table B pollutants and attached the results to this application
package?
❑✓ Yes ❑ 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 ❑ No 4 SKIP to Section 4.
applicable.
3.17 Have you completed monitoring for all applicable Table C pollutants and attached the results to this application
package?
❑✓ Yes 0 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?
2 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
110006674679 NC0083551 Dixon WTP 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?
No 4 Complete tests and Table E and SKIP to
❑✓ Yes ❑ Item 3.26.
3.20 Have you previously submitted the results of the above tests to your NPDES permitting authority?
No 4 Provide results in Table E and SKIP to
❑� Yes ❑ 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)
2/15/2021(January 2021 Report)-Passed;5/21/2021(April 2021 Report)
-Passed;8/24/2021(July 2021 Report)-Passed;11/23/2021(October
o 02/15/2021
2021 Report)-Passed;2/23/2022(January 2022 Report)-Passed;
5/23/2022(April 2022 Report)-Passed.
w3.22 Regardless of how you provided your WET testing data to the NPDES permitting authority,did any of the tests result in
toxicity?
❑ Yes ❑✓ No 4 SKIP to Item 3.26.
3.23 Describe the cause(s)of the toxicity:
N/A-Most recent toxicity failure was in January 2017.
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.
N/A
3.26 Have you completed Table E for all applicable outfalls and attached the results to the application package?
D Yes ❑ Not applicable because previously submitted
information to the NPDES •ermittin. authori .
SECTION 4.INDUSTRIAL DISCHARGES AND HAZARDOUS WASTES(40 CFR 122.21(j)(6)and(7))
4.1 Does the POTW receive discharges from Sills or NSCIUs?
❑ Yes ❑✓ No 4 SKIP to Item 4.7.
d 4.2 Indicate the number of Sills and NSCIUs that discharge to the POTW.
Number of SIUs Number of NSCIUs
N/A N/A
0
A 4.3 Does the POTW have an approved pretreatment program?
_ ❑ Yes ❑✓ No
-0
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?
t
❑ Yes ❑✓ No 4 SKIP to Item 4.6.
c 4.5 Identify the title and date of the annual report or pretreatment program referenced in Item 4.4.SKIP to Item 4.7.
N/A
c
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
110006674679 NC0083551 Dixon WTP 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
N/A ❑ Truck ❑ Rail
❑ Dedicated pipe ❑ Other(specify)
0
0 Truck ❑ Rail
❑ Dedicated pipe ❑ Other(specify)
0
N ❑ Truck ❑ Rail
413
_ ❑ Dedicated pipe ❑ Other(specify)
N
N
R 4.9 Does the POTW receive,or has it been notified that it will receive,wastewaters that originate from remedial activities,
0 including those undertaken pursuant to CERCLA and Sections 3004(7)or 3008(h)of RCRA?
Cl Yes ❑✓ No SKIP to Section 5.
N 4.10 Does the POTW receive(or expect to receive)less than 15 kilograms per month of non-acute hazardous wastes as
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-SKIP to Section 6.
-0 5.2 Have you attached a CSO system map to this application?(See instructions for map requirements.)
a ❑ Yes ❑ No
5.3 Have you attached a CSO system diagram to this application?(See instructions for diagram requirements.)
c� ❑ Yes ❑ No
EPA Form 3510-2A(Revised 3-19) Page 10

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
110006674679 NC0083551 Dixon WTP 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 N/A
0
.5
State and ZIP code
N
o County
R
o Latitude °
o
co 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 ❑ Yes ❑ No ❑ Yes ❑ No
cn
'`o CSO flow volume ❑ Yes ❑ No ❑ Yes ❑ No ❑ Yes ❑ No
o CSO pollutant ❑ Yes ❑ No ❑ Yes ❑ No ❑ Yes ❑ No
o concentrations
a)
o' Receiving water quality ❑ Yes ❑ No ❑ Yes 0 No ❑ Yes ❑ No
CSO frequency ❑ Yes ❑ No ❑ Yes 0 No ❑ Yes ❑ No
Number of storm events ❑ Yes ❑ No ❑ Yes ❑ No ❑ Yes ❑ No
5.6 Provide the following information for each of your CSO outfalls.
CSO Outfall Number CSO Outfall Number CSO Outfall Number
Number of CSO events in events events events
v, the past year
,a
a
= Average duration per hours hours hours
event ❑Actual or❑Estimated ❑Actual or❑Estimated 0 Actual or 0 Estimated
w million gallons million gallons million gallons
o Average volume per event
0 0 Actual or 0 Estimated 0 Actual or 0 Estimated 0 Actual or 0 Estimated
Minimum rainfall causing inches of rainfall inches of rainfall inches of rainfall
a CSO event in last year 0 Actual or 0 Estimated ❑Actual or❑Estimated 0 Actual or 0 Estimated
EPA Form 3510-2A(Revised 3-19) Page 11

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
110006674679 NC0083551 Dixon WTP 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 N/A
Name of watershed/
stream system
U.S.Soil Conservation ❑Unknown 0 Unknown ❑ Unknown
Service 14-digit
watershed code
"> (if known)
Name of state
ce management/river basin
U.S.Geological Survey ❑Unknown 0 Unknown ❑Unknown
8-Digit Hydrologic Unit
Code(if known)
Description of known
water quality impacts on
receiving stream by CSO
(see instructions for
exam.les
SECTION 6.CIfCKLIST 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 ❑ w/variance request(s) ❑ w/additional attachments
Information for All Applicants
Section 2:Additional ❑� w/topographic map ❑✓ w/process flow diagram
Information El w/additional attachments
✓❑ w/Table A ❑✓ w/Table D
❑ Section 3:Information on El w/Table B ❑ w/Table E
Effluent Discharges
El w/Table C ❑ w/additional attachments
Section 4: Industrial ❑ w/SIU and NSCIU attachments ❑ w/Table F
❑ Discharges and Hazardous
Wastes Elw/additional attachments
Section 5:Combined Sewer El w/CSO map Elw/additional attachments
Overflows ❑ w/CSO system diagram
Section 6:Checklist and
El Certification Statement El w/attachments
Y 6.2 Certification Statement
1 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(print or type first and last name) Official title
David M.Mohr,PE Chief Operations Officer
Signat Date signed
P C 08/09/2022
' I G
EPA Form 3510-2A(Revised 3-19) Page 12

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110006674679 NC0083551 Dixon WTP 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)
Sam.les
Biochemical oxygen demand
0 BOD5 or o CBODv N/A ❑ML
❑MDL
rerort one
o ML
Fecal coliform N/A ----- 0 MDL
Design flow rate no limit -no limit -continuous
pH(minimum) 6.8 s.u.
pH(maximum) 8.5 s.u.
Temperature(winter) N/A ----
Temperature(summer) N/A0 ML
----
Total suspended solids(TSS) 15.0 mg/I 10 mg/I 2/month Permit requirement "' o 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).
EPA Form 3510-2A(Revised 3-19) Page 13

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110006674679 NC0083551 Dixon WTP 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 Value Units Value Units Number of Method, (include units)
Samples
Ammonia(as N) no limit no limit Monthly Permit requirement D ML
❑MDL
Chlorine DML
(total residual,TRC)2 13 /I 2/month Permit requirement
p g D MDL
D ML
Dissolved oxygen no limit no limit 2/month Permit requirement D MDL
-
Nitrate/nitrite N/A DML
❑MDL
0 ML
Kjeldahl nitrogen N/A D MDL
0 ML
Oil and grease N/A D MDL
D ML
Phosphorus no limit no limit Quarterly Permit requirement D MDL
Total dissolved solids no limit no limit Monthly Permit Requirement DML
❑MDL
t Sampling shall be conducted according to suffidentiy 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
) a9

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110006674679 NC0083551 Dixon WTP OMB No.2040-0004
TABLE C.EFFLUENT PARAMETERS FOR SELECTED POTWS
Maximum Daily Discharge Average Daily Discharge Analytical ML or MDL
Pollutant Number of Method, (include units)
Value Units Value Units Samples
Metals,Cyanide,and Total Phenols
Hardness(as CaCOa) o ML
❑MDL
0 ML
Antimony,total recoverable ❑MDL
0 ML
Arsenic,total recoverable 34.5 pg/I 5 Ng/I 2/month Permit requirement 0 MDL
0 ML
Beryllium,total recoverable o MDL
Cadmium,total recoverable o ML
❑MDL
Chromium,total recoverable 0 ML
o MDL
Copper,total recoverable no limit no limit Quarterly Permit requirement 0 ML
❑MDL
Lead,total recoverable no limit no limit Quarterly Permit requirement o ML
❑MDL
Mercury,total recoverable o ML
❑MDL
Nickel,total recoverable o ML
❑MDL
Selenium,total recoverable ❑ML
❑MDL
Silver,total recoverable o ML
❑MDL
Thallium,total recoverable 0 ML
o MDL
0 ML
Zinc,total recoverable 47.6 p g/l 42.8 Ng/I Monthly Permit requirement 0 MDL
Cyanide ❑ML
❑MDL
Total phenolic compounds ❑ML
❑MDL
Volatile Organic Compounds
Acrolein 0 ML
o MDL
Acrylonitrile ❑ML
o MDL
Benzene ❑ML
❑MDL_
Bromoform ❑ML
❑MDL
EPA Form 3510-2A(Revised 3-19) Page 17

•
EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110006674679 NC0083551 Dixon WTP OMB No.2040-0004
TABLE C.EFFLUENT PARAMETERS FOR SELECTED POTWS
Maximum Daily Discharge Average Daily Discharge Analytical ML or MDL
Pollutant Number of Method' (include units)
Value Units Value Units Samples
Carbon tetrachloride o ML
o MDL
Chlorobenzene o ML
❑MDL
Chlorodibromomethane o ML
❑MDL
Chloroethane ❑ML
❑MDL
2-chloroethylvinyl ether ❑ML
o MDL
Chloroform o ML
❑MDL
Dichlorobromomethane o ML
❑MDL
1,1-dichloroethane o ML
❑MDL
1,2-dichloroethane o ML
❑MDL
trans-1,2-dichloroethylene o ML
❑MDL
1,1-dichloroethylene o ML
0 MDL
1,2-dichloropropane o ML
❑MDL
1,3-dichloropropylene o ML
❑MDL
Ethylbenzene o ML
❑MDL
Methyl bromide o ML
❑MDL
Methyl chloride ❑ML
❑MDL
0 ML
Methylene chloride ❑MDL
1,1,2,2-tetrachloroethane o ML
❑MDL
Tetrachloroethylene ❑ML
❑MDL
Toluene ML
o MDL
1,1,1-trichloroethane Cl ML
o MDL
1,1,2-trichloroethane 0 ML
o MDL
EPA Form 3510.2A(Revised 3-19) Page 18

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110006674679 NC0083551 Dixon WTP OMB No.2040-0004
TABLE C.EFFLUENT PARAMETERS FOR SELECTED POTWS
Maximum Daily Discharge Average Daily Discharge Analytical ML or MDL
Pollutant Number of Method, (include units)
Value Units Value Units Samples
❑ML
Trichloroethylene ❑MDL
❑ML
Vinyl chloride 0 MDL
Acid-Extractable Compounds
o ML
p-chloro-m-cresol MDL
2-chlorophenol o ML
_ ❑MDL
ML
2,4-dichlorophenol ❑MDL
0 ML
2,4-dimethylphenol o MDL
4,6-dinitro-o-cresol o ML
❑MDL
ML
2,4-dinitrophenol ❑MDL
ML
2-nitrophenol ❑MDL
4-nitrophenol ❑ML
_ ❑MDL
Pentachlorophenol o ML
❑MDL
Phenol ❑ML
❑MDL
ML
2,4,6-tichlorophenol o MDL
Base-Neutral Compounds
Acenaphthene o ML
❑MDL
0 ML
Acenaphthylene o MDL
Anthracene o ML
_ ❑MDL
Benzidine o ML
o MDL
Benzo(a)anthracene o ML
❑MDL
ML
Benzo(a)pyrene ❑MDL
3,4-benzofluoranthene 0 ML
❑MDL
EPA Form 3510-2A(Revised 3-19) Page 19

EPA Identification Number NPDES Permit Number Facility Name Outran Number Form Approved 03/05/19
110006674679 NC0083551 Dixon WTP OMB No.2040-0004
TABLE C.EFFLUENT PARAMETERS FOR SELECTED POTWS
Maximum Daily Discharge Average Daily Discharge Analytical ML or MDL
Pollutant - Number of Method, (include units)
Value Units Value Units Samples
Benzo(ghi)perylene o ML
_ ❑MDL
ML
Benzo(k)fluoranthene o MDL
ML
Bis(2-chloroethoxy)methane o MDL
ML
Bis(2-chloroethyl)ether 0 MDL
ML
Bis(2-chloroisopropyl)ether ❑MDL
ML
Bis(2-ethylhexyl)phthalate o MDL
ML
4-bromophenyl phenyl ether o MDL
ML
Butyl benzyl phthalate o MDL
ML
2-chloronaphthalene o MDL
ML
4-chlorophenyl phenyl ether o MDL
O ML
Chrysene o MDL
ML
di-n-butyl phthalate o MDL
O ML
di-n-octyl phthalate ❑MDL
ML
Dibenzo(a,h)anthracene o MDL
1,2-dichlorobenzene o ML
_ ❑MDL
1,3-dichlorobenzene ❑ML
❑MDL
1,4-dichlorobenzene o ML
o MDL
3,3-dichlorobenzidine o ML
❑MDL
Diethyl phthalate o ML
Dimethyl phthalate o MDL
2,4-dinitrotoluene o ML
❑MDL
2,6-dinitrotoluene o ML
❑MDL
EPA Form 3510-2A(Revised 3.19) Page 20

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110006674679 NC0083551 Dixon WTP OMB No.2040-0004
TABLE C.EFFLUENT PARAMETERS FOR SELECTED POTWS
Maximum Daily Discharge Average Daily Discharge Analytical ML or MDL
Pollutant Number of Method' (include units)
Value Units Value Units Samples
o ML
1,2-diphenylhydrazine o MDL
Fluoranthene o ML
❑MDL
Fluorene 0 ML
❑MDL
Hexachlorobenzene o ML
❑MDL
Hexachlorobutadiene 0 ML
❑MDL
0 ML
Hexachlorocyclo-pentadiene o MDL
Hexachloroethane 0 ML
❑MDL
0 ML
Indeno(1,2,3-cd)pyrene ❑MDL
o ML
Isophorone o MDL
D ML
Naphthalene o MDL
Nitrobenzene o ML
o MDL
ML
N-nitrosodi-n-propylamine 0 MDL
o ML
N-nitrosodimethylamine ❑MDL
o ML
N-nitrosodiphenylamine o MDL
Phenanthrene ❑ML
❑MDL
❑ML
Pyrene ❑MDL
1,2,4-trichlorobenzene o 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 O.See instructions and 40 CFR 122.21(e)(3).
EPA Form 3510-2A(Revised 3-19) Page 21

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
110006674679 NC0083551 Dixon WTP OMB No.2040-0004
TABLE D.ADDITIONAL POLLUTANTS AS REQUIRED BY NPDES PERMITTING AUTHORITY
Maximum Daily Discharge Average Daily Dischar e
Pollutant Analytical ML or MDL
fist) Value Units Value Units Number of Method' (include units)
Samples
❑ No additional sampling is required by NPDES permitting authority.
❑ML
Salinity (composite) no limit no limit Monthly Permit requirement ❑MDL
Salinity(grab) no limit no limit Monthly Permit requirement 0 ML
❑MDL
Conductivity(composite) no limit no limit Monthly Permit requirement 0 ML
❑MDL
Conductivity(grab) no limit no limit Monthly Permit requirement 0 ML
❑MDL
❑ML
Turbidity no limit no limit 2/month Permit requirement ❑MDL
Total Chloride no limit no limit Monthly Permit requirement ML
❑MDL
Total Manganese no limit no limit Monthly Permit requirement O ML
❑MDL
Total Nitrogen no limit no limit Quarterly Permit requirement 0 ML
❑MDL
❑ML
❑MDL
❑ML
❑MDL
O ML
0 MDL
❑ML
❑MDL
❑ML
❑MDL
❑ML
❑MDL
❑ML
❑MDL
❑ML
❑MDL
❑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 1,subchapter N or 0.See instructions and 40 CFR 122.21(e)(3).
EPA Form 3510-2A(Revised 3-19) Page 23

NPDES PERMIT NUMBER NC0083551
DIXON WATER TREATMENT PLANT
ADDITIONAL ATTACHMENTS
• Topographic Map
• WTP Process Information
• Settling Lagoons Information
• Lagoon Solids Handling Plan

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Onslow Water and Sewer Authority N
Dixon WTP
NPDES Permit NC0083551A _. , - ._, __; , ,
Receiving Stream: UT to Stones Creek Stream Class:SA; HQW-PNA Facility Location n
scale not shown
Stream Segment: 19-30-3 Sub-Basin#:03-05-02
River Basin:White Oak HUC:0302030202 SCALE USGS Quad:Sneads Ferry
County:Onslow 1:24,000 34.573611°.-77.470278°

Dixon WTP Water Treatment Process
6661 Wilmington Hwy
Holly Ridge NC, 28445
NPDES #NC0083551
Greensand Filters
Aerators Train 1
2000 GPM Each After
Filter
Det#211:11#0 Train 1
Flow Per Filter
v\ Train 1 445 GPM
Raw Water In KMn04 is Injected at Filter Pumps Train 2 445 GPM
Flow Detention Tanks Pump Water Train 2
4000 GPM to Plant After
Filter
Det#1� Train 2
Backwash Waste to Lagoons
Approximate Avg
55,000-gal Waste Train 1 and
70,000-gal Waste Train 2
per backwash
This Schematic is a general representation of the Dixon WTP
Process only and is NOT depicting orientation or scale of the
Different components within or around the WTP Facility

Ion Exchange Softeners
Softeners 1&2 535gpm
Softeners 3-6 335gpm
Train 1
After
Filter
Treated Flow
Total 4000 GPM To Clear Wells
Softener By Pass or Reverse Osmosis
Train 1 Softener By-Pass 530gpm
Train 2 Softener By-Pass 660gpm 1200 Gal of Saturated
Brine Is Applied per
Softener Regeneration
Train 2
After
Filter Softener Regeneration Waste to Lagoons
Softener By-Pass
Approximately 18,000 gal
Per Regen
This Schematic is a general representation of the Dixon WTP
Process only and is NOT depicting orientation or scale of the
Different components within or around the WTP Facility

Conventional Flow Can Reverse Osmosis
Be Sent for Further Each RO Skid Will Process 700gpm of Permeate for a Total of 2100gpm
Treatment With RO or At 70%Recovery We Will Produce 300gpm of Concentrate Waste per Skid
Sent To Clear Wells For a Total Concentrate Waste Flow of 900gpm Sent to the Lagoons
Anti-Scalant Remaining Treated Flow is By-Passed Around the RO Skids Through the
Injection
Blend Line.
Micron Filtration
Flow to RO Concentrate Waste to Lagoon
Reverse Osmosis Skid 1
From Filter/Softeners
F"."""
Reverse Osmosis Skid 2
Flow to
Clear Wells
Reverse Osmosis Skid 3
25%Sodium Hydroxide
Injection to Adjust pH
=1> Blend Line
This Schematic is a general representation of the Dixon WTP
Treated Flow
to Clear Wells Process only and is NOT depicting orientation or scale of the
Different components within or around the WTP Facility

Entry Point Chlorination
Treated Flow From Plant
41
•
Chemical
Injection Vault High ervice
1. HFS(Hydrofluorosilicic Acid) Pumps t System
2. PO4(Ortho Phosphate)
3.Cl2 (Sodium Hypochlorite)
•
Entry Point Chlorination
Plant Floor Drains and Storm Drains
To Lagoo� There are two(2) To Retention Pond Behind CW's
Floor Drains Flowing to Lagoon: 24"x24"Storm
Chemical Feed Room Floor Drains Located Outside
Lab/Office Floor and Sink The Plant
Bathroom Floor
HFS Room Floor
CL2 Feed and CL2 Storage Room Floor This Schematic is a general representation of the Dixon WTP
Blower Room Floor Process onlyand is NOT depicting orientation or scale of the
Filter Bay Floor p g
Different components within or around the WTP Facility

6661 Wilmington Hwy, Holly Ridge NC 28445. NPDES Permit# NC0083551. Each lagoon holds .915MG. There is no chemical addition. Max
influent flow is 1600 GPM as a batch feed. Effluent vault has two (2) 1000gpm pumps.There are two alternative influent points.
Isolation Valve
Primary Influent
Tertiary Influent
Primary Lagoon Secondary Lagoon Tertiary Lagoon
Discharge
Isolation Valve
To Creek
Secondary Influent
Pump Vault
Proposed By-Pass Pump Meter Vault
Check Valve Vault
From Plant

Solids Handling Plan
Dixon Water Treatment Plant
A pump and haul method of removing solids from the Three (3) lagoons at Dixon WTP will be
utilized. Solids will be dewatered to pass the paint test and transported by truck to the Onslow
County Landfill. One (1) lagoon will be pumped every three (3) years so as not to allow solids
accumulation to interfere with detention time. The Tertiary Lagoon was cleaned May 2021.
6661 Wilmington Hwy,Holly Ridge NC 28445.NPDES Permit#NC0083551. Each lagoon holds.915MG.There is no chemical addition.Max
influent flow is 1600 GPM as a batch feed.Effluent vault has two(2)1000gpm pumps.There are two alternative influent points.
Inf lent
Primary Lagoon Secondary Lagoon Tertiary Lagoon
silo To Creek
Secondary Influent � a
Purp'rauts
Propcseo Ey-Pas Pimp Meter'ion'
Check'Valve.auh
From Plant