NC0073539_Renewal (Application)_20230605

fit.STATE Q,
ROY COOPER
Governor _ i $\
ELIZABETH S.BISER ,
Secretary
RICHARD E.ROGERS,JR. NORTH CAROLINA
Director - - Environmental Quality
June 06, 2023
Aqua North Carolina, Inc.
Attn: Amanda Berger
202 MacKenan Court
Cary, NC 27511
Subject: Permit Renewal
Application No. NC0073539
Willowbrook Subdivision WWTP
Mecklenburg County
Dear Applicant:
The Water Quality Permitting Section acknowledges the June 5, 2023, 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. 150B-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.
Sincerely,
5Cr$01'
Wren Thedford
Administrative Assistant
Water Quality Permitting Section
ec: WQPS Laserfiche File w/application
D_E 0 North Caroli Department Quality I of Wa
Mooresville Regnaional Office of 610Environmental East Center Avenue,SuiteDivision 301 I Mooretersville,NortResources
h Carolina 28115
dam\ 704.663.1699

AOJA . RECEIVED
*Essential J U N 0 5 2023
June 2, 2023 NCDEQIDWRINPDES
NC Department of Environmental Quality
Division of Water Resources
NPDES Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
Subject: Application for Permit Renewal
Aqua North Carolina, Inc.
Willowbrook Wastewater Treatment Plant
NPDES No. ► ool. 39
Mecklenburg County
To Whom It May Concern:
Attached are the completed application Modification Application Form 2A ,
process flow diagram, and topographic map. This letter and attachments are
Aqua North Carolina's request to renew the subject permit.
Also, please update the plant description on record to include Willowbrook's
equalization tank. It was omitted from the descriptions in our renewal
application.
If you need any additional information or assistance, please feet free to contact
me at [e-mail].
Sincerely,
Amanda Berger
Director, Environmental Compliance

1 NPDES Permit Number Facility Name Modified Application Form 2A
NC0073539 Willowbrook WWTP Modified March 2021
1.7 Provide the collection system information requested below for the treatment works.
Municipality Population Collection System Type Ownership Status
Served Served (indicate percentage) 1
Huntersville,NC 249 100 %separate sanitary sewer El Own 0 Maintain
%combined storm and sanitary sewer ❑ Own 0 Maintain
CD ❑ Unknown 0 Own 0 Maintain
Cl) %separate sanitary sewer ❑ Own 0 Maintain
g %combined storm and sanitary sewer 0 Own 0 Maintain
0 Unknown 0 Own 0 Maintain
a %separate sanitary sewer 0 Own 0 Maintain
-o %combined storm and sanitary sewer 0 Own 0 Maintain
co 0 Unknown ❑ Own 0 Maintain
co %separate sanitary sewer ❑ Own 0 Maintain
c cn %combined storm and sanitary sewer ❑ Own 0 Maintain
❑ Unknown 0 Own 0 Maintain
Total 249
°' Population
v Served
Separate Sanitary Sewer System Combined Storm and
Sanitary Sewer
Total percentage of each type of 100
sewer line(in miles)
z' 1.8 Is the treatment works located in Indian Country?
'
o ❑ Yes 0 No
U
R 1.9 Does the facility discharge to a receiving water that flows through Indian Country?
c ❑ Yes ❑ No
1.10 Provide design and actual flow rates in the designated spaces. Design Flow Rate
0.048 mgd
To
Annual Average Flow Rates(Actual)
aTwo Years Ago Last Year This Year
.012 mgd 0.013 mgd 0.011 mgd
CO• 0
Maximum Daily Flow Rates(Actual)
o
o Two Years Ago Last Year This Year
0.029 mgd 0.030 mgd 0.031 mgd
w 1.11 Provide the total number of effluent discharge points to waters of the State of North Carolina by type.
Total Number of Effluent Discharge Points by Type
a Q Constructed
Combined Sewer
0• 1—
T Treated Effluent Untreated Effluent Overflows Bypasses Emergency
Overflows
N
0 1
Page 2

NPDES Permit Number Facility Name Modified Application Form 2A
NC0073539 Willowbrook WWTP Modified March 2021
Outfalls Other Than to Waters of the State of North Carolina
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 State of North Carolina?
❑ Yes ❑r 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 ❑ Intermittent
2 1.14 Is wastewater applied to land?
2 ❑ Yes No SKIP to Item 1.16.
1.15 Provide the land application site and discharge data requested below.
0 Land Application Site and Discharge Data
Average Daily Volume Continuous or
Location Size Applied Intermittent
Er'E _ (check one)
-c 0 Continuous
acres gpd 0 Intermittent
0
0 Continuous
acres gpd 0 Intermittent
acresgpd 0 Continuous
0 Intermittent
1.16 Is effluent transported to another facility for treatment prior to discharge?
El Yes © 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
Page 3

NPDES Permit Number Facility Name Modified Application Form 2A
NC0073539 Willowbrook WWTP Modified March 2021
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)
City or town State ZIP code
0
U
Contact name(first and last) Title
0
L
Phone number Email address
2
o NPDES number of receiving facility(if any) 0 None Average dailyflow rate mgd
0_ 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
8 not have outlets to waters of the State of North Carolina(e.g.,underground percolation,underground injection)?
❑ Yes ❑r No 4 SKIP to Item 1.23.
L
0 1.22 Provide information in the table below on these other disposal methods.
Information on Other Disposal Methods
o Disposal Location of Size of Annual Average Continuous or Intermittent
Method Disposal Site Disposal Site Daily Discharge (check one)
Description Volume
acresgpd 0 Continuous
❑ 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.
a Consult with your NPDES permitting authority to determine what information needs to be submitted and when.)
c ❑ Discharges into marine waters(CWA ❑ Water quality related effluent limitation(CWA Section
cr
Ca 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 El 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
(company name)
0
Mailing address
(street or P.O.box)
8 City,state,and ZIP
code
Contact name(first and
0 last)
Phone number
Email address
Operational and
maintenance
responsibilities of
contractor
Page 4

NPDES Permit Number Facility Name Modified Application Form 2A
NC0073539 Willowbrook WWTP Modified March 2021
SECTION 2.ADDITIONAL INFORMATION(40 CFR 122.21(j)(1)and(2))
c Outfalls to Waters of the State of North Carolina
2.1 Does the treatment works have a design flow greater than or equal to 0.1 mgd?
rn
c ❑ Yes 0 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.
gpd
Indicate the steps the facility is taking to minimize inflow and infiltration.
-o
c
0
c
2.3 Have you attached a topographic map to this application that contains all the required information?(See instructions for
A 0 specific requirements.)
0
a ❑ Yes ❑ No
E 2.4 Have you attached a process flow diagram or schematic to this application that contains all the required information?
c E (See instructions for specific requirements.)
Leo
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
1.
a
a)
E
a)
2.
E
0
y 3.
a)
a,
d
U)
4.
v 2.6 Provide scheduled or actual dates of completion for improvements.
Scheduled or Actual Dates of Completion for Improvements
CD
Affected Attainment of
d Scheduled Begin End Begin
Outfalls Operational
o Improvement Construction Construction Discharge
12. (from above) (list outtall (MM/DD/YYYY) (MM/DDIYYYY) (MM/DD/YYYY) Level
number) (MM/DD/YYYY)
d
1.
z
2.
3.
4.
2.7 Have appropriate permits/clearances concerning other federal/state requirements been obtained?Briefly explain your
response.
❑ Yes ❑ No El None required or applicable
Explanation:
Page 5

•
NPDES Permit Number Facility Name Modified Application Form 2A
NC0073539 Willowbrook WWTP Modified March 2021
SECTION 3.INFORMATION ON EFFLUENT DISCHARGES(40 CFR 122.210)(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 NC
County Mecklenburg
O City or town Huntersville
0
w
Distance from shore 60 ft. ft. ft.
n
d Depth below surface 3 ft. ft. ft.
Average daily flow rate 0.011 mgd mgd mgd
Latitude 35° 26' 38" N
Longitude 80° 49' 09" W "
to
3.2 Do any of the outfalls described under Item 3.1 have seasonal or periodic discharges?
o ❑ Yes ❑r No 4 SKIP to Item 3.4.
R 3.3 If so,provide the following information for each applicable outfall.
L
y Outfall Number Outfall Number Outfall Number
Number of times per year
0 discharge occurs
CD Average duration of each
discharge(specify units)
Average flow of each mgd mgd mgd
discharge
in Months in which discharge
occurs
3.4 Are any of the outfalls listed under Item 3.1 equipped with a diffuser?
❑ Yes El No 4 SKIP to Item 3.6.
3.5 Briefly describe the diffuser type at each applicable outfall.
S.
Outfall Number Outfall Number Outfall Number
c
vi 3 6 Does the treatment works discharge or plan to discharge wastewater to waters of the State of North Carolina from
one or more discharge points?
4.1
3 0 Yes ❑ No+SKIP to Section 6.
Page 6

NPDES Permit Number Facility Name Modified Application Form 2A
NC0073539 Willowbrook WWTP Modified March 2021
3.7 Provide the receiving water and related information(if known)for each outfall.
Outfall Number oo1 Outfall Number Outfall Number
Receiving water name Ramah Creek
Name of watershed,river,
`o or stream system Ramah Creek
Q- U.S.Soil Conservation
Service 14-digit watershed
o code
Name of state Yadkin-Pee Dee
management/river basin
rn
U.S.Geological Survey
8-digit hydrologic
cataloging unit code
Critical low flow(acute) 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 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 0 Primary 0 Primary
Treatment(check all that 0 Equivalent to 0 Equivalent to ❑ Equivalent to
apply per outfall) secondary secondary secondary
O Secondary 0 Secondary 0 Secondary
O Advanced 0 Advanced 0 Advanced
O Other(specify) ❑ Other(specify) 0 Other(specify)
0
a Design Removal Rates by
.r. Outfall
fR
BODs or CBODs 85
15
I-
TSS 85 % oio
0 Not applicable ❑Not applicable 0 Not applicable
Phosphorus
®Not applicable 0 Not applicable 0 Not applicable
Nitrogen %
Other(specify) 0 Not applicable 0 Not applicable 0 Not applicable
Page 7

NPDES Permit Number Facility Name Modified Application Form 2A
NC0073539 Willowbrook WWTP Modified March 2021
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.
-0
a)
c
c
0
Outfall Number oo>_ Outfall Number Outfall Number
0
Disinfection type��a YP Tablet Chlorination w/contact
tank
Seasons used All
Dechlorination used? ❑ Not applicable 0 Not applicable 0 Not applicable
El Yes ❑ Yes D Yes
0 No ❑ No ❑ No
3.10 Have you completed monitoring for all Table A parameters and attached the results to the application package?
CI 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?
0 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
m Acute Chronic Acute Chronic Acute Chronic
Number of tests of discharge
= water
Number of tests of receiving
~ water
w
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?
ElYes 4 Complete Table B,including chlorine. 0 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?
❑✓ Yes 0 No
Have you completed monitoring for all applicable Table D pollutants required by your NPDES permitting authority and
3.18 attached the results to this application package?
❑ Yes ❑� No additional sampling required by NPDES
permitting authority.
Page 8

NPDES Permit Number Facility Name Modified Application Form 2A
NC0073539 Willowbrook WWTP Modified March 2021
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(MM/DD/YYYY) Summary of Results
v
m
c
c
co 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?
a' ❑ Yes ❑ No -) SKIP to Item 3.26.
w 3.23 Describe the cause(s)of the toxicity:
c
d
W
3.24 Has the treatment works conducted a toxicity reduction evaluation?
❑ Yes El 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?
❑ Yes Not applicable because previously submitted
information to the NPDES •ermittin• authorit .
Page 9

NPDES Permit Number Facility Name Modified Application Form 2A
NC0073539 Willowbrook WWTP Modified March 2021
SECTION 6.CHECKLIST 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
Information for All Applicants ❑ wl variance request(s) ❑ w/additional attachments
El Section 2:Additional ❑✓ w/topographic map ❑✓ w/process flow diagram
Information ❑ w/additional attachments
0 w/Table A El w/Table D
❑✓ Section 3:Information on ✓❑ w/Table B ❑ w/additional attachments
Effluent Discharges
•
El w/Table C
w
co
Section 4:Not Applicable
c
0
Section 5:Not Applicable
U
-0 Section 6:Checklist and
R ❑ Certification Statement ❑ w/attachments
H
Y 6.2 Certification Statement
/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
Amanda Berger Envir.Compliance Director
Signature s - eA
Date signed
06/02/2023
Page 10

NPDES Permit Number Facility Name Outfall Number Modified Application Form 2A
NC0073539 Willowbrook WWTP 001 Modified March 2021
TABLE A.EFFLUENT PARAMETERS FOR ALL POTWS
Maximum Daily Discharge Average Daily Discharge Analytical ML or MDL
Pollutant Number of Methods Include
Value Units Value Units Sam les ( units)
Biochemical oxygen demand
El ML
o BODs or❑CBODs 10 mg/L 1.55 mg/L 250 SM5210B 2.0 t]MDL
resort one
0 ML
Fecal coliform 240 mg/L 5.64 mg/L 263 SM9222D(MF) 1.0 t MDL
Design flow rate 46,000 gallons 11,392 gallons 1863
pH(minimum) 6.3 units
pH(maximum) 8.6 units
Temperature(winter) 23 degrees Celsius 14.52 degrees Celsius 575
Temperature(summer) 28.4 degrees Celsius 22.97 degrees Celsius 752
0 ML
Total suspended solids(TSS) 20 mg/L 1.92 mg/L 275 SM2540D 2.5 p 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).
Page 11

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Modified Application Form 2A
NC0073539 Willowbrook WWTP 001 Modified March 2021
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 Methods Include units
Value Units Value Units SamplesML
( )
Ammonia(as N) 1.52 mg/L 0.09 mg/L 199 SM4500NH3D 0.2 CI MDL
Chlorine ❑ML
(total residual,TRC)2 42 ug/L 8.40 ug/L 542 Field-Hach DPD ❑MDL
Dissolved oxygen 11.1 mg/L 8.81 mg/L 271 Field-Hach DPD ❑ML
❑MDL
Nitrate/nitrite 0 ML
❑MDL
Kjeldahl nitrogen ❑MDL
0 ML
Oil and grease ❑MDL
Phosphorus ❑ML
❑MDL
Total dissolved solids ❑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 12

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Modified Application Form 2A
NC0073539 Willowbrook WWTP Modified March 2021
TABLE C.EFFLUENT PARAMETERS FOR SELECTED POTWS
Maximum Daily Discharge Average Daily Discharge Analytical ML or MDL
Pollutant •
Number of Method1 (include units)
Value Units Value Units Samples
Metals,Cyanide,and Total Phenols
❑ML
Hardness(as CaCO3) ❑MDL
Antimony,total recoverable ❑ML
❑MDL
Arsenic,total recoverable ❑ML
❑MDL
Beryllium,total recoverable ❑ML
❑MDL
Cadmium,total recoverable ❑ML
❑MDL
Chromium,total recoverable ❑ML
❑MDL
Copper,total recoverable ❑ML
❑MDL
Lead,total recoverable ❑ML
❑MDL
Mercury,total recoverable ❑ML
❑MDL
Nickel,total recoverable ❑ML
❑MDL
Selenium,total recoverable ❑ML
❑MDL
Silver,total recoverable ❑ML
❑MDL
Thallium,total recoverable ❑ML
❑MDL
Zinc,total recoverable ❑ML
❑MDL
Cyanide ❑ML
❑MDL
Total phenolic compounds ❑ML
❑MDL
Volatile Organic Compounds
Acrolein 0 ML
❑MDL
ML
Acrylonitrile ❑MDL
Benzene 0 ML
❑MDL
Bromoform ❑ML
o MDL
EPA Form 3510-2A(Revised 3-19) Page 13

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Modified Application Form 2A
NC0073539 Willowbrook WWTP Modified March 2021
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 ❑ML
❑MDL
Chlorobenzene ❑ML
❑MDL
Chlorodibromomethane ❑ML
_ ❑MDL
Chloroethane ❑ML
❑MDL
2-chloroethylvinyl ether ❑ML
❑MDL
Chloroform ❑ML
❑MDL
Dichlorobromomethane ❑ML
❑MDL
1,1-dichloroethane ❑ML
❑MDL
1,2-dichloroethane ❑ML
❑MDL
0 ML
trans-1,2-dichloroethylene ❑MDL
1,1-dichloroethylene ❑ML
❑MDL
1,2-dichloropropane ❑ML
❑MDL
1,3-dichloropropylene ❑ML
❑MDL
0 ML
Ethylbenzene ❑MDL
0 ML
Methyl bromide ❑MDL
0 ML
Methyl chloride ❑MDL
ML
Methylene chloride ❑MDL
1,1,2,2-tetrachloroethane ❑ML
❑MDL
Tetrachloroethylene ❑ML
❑MDL
Toluene 0 ML
❑MDL
1,1,1-trichloroethane ❑ML
❑MDL
1,1,2-trichloroethane ❑ML
❑MDL
EPA Form 3510-2A(Revised 3-19) Page 14

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Modified Application Form 2A
NC0073539 Willowbrook WWTP Modified March 2021
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
Trichloroethylene o ML
❑MDL
Vinyl chloride ❑ML
❑MDL
AcId-Extractable Compounds
p-chloro-m-cresol ❑ML
❑MDL
2-chlorophenol ❑ML
0 MDL
2,4-dichlorophenol ❑ML
0 MDL
2,4-dimethylphenol ❑ML
❑MDL
4,6-dinitro-o-cresol ❑ML
❑MDL
2,4-dinitrophenol ❑ML
❑MDL
2-nitrophenol ❑ML
❑MDL
4-nitrophenol ❑ML
0 MDL
Pentachlorophenol ❑ML
❑MDL
Phenol ❑ML
❑MDL
2,4,6-trichlorophenol ❑ML
❑MDL
Base-Neutral Compounds
Acenaphthene ❑ML
❑MDL
Acenaphthylene ❑ML
0 MDL
Anthracene ❑ML
❑MDL
Benzidine ❑ML
0 MDL
Benzo(a)anthracene ❑ML
❑MDL
Benzo(a)pyrene ❑ML
❑MDL
3,4-benzofluoranthene ❑ML
❑MDL
EPA Form 3510-2A(Revised 3-19) Page 15

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Modified Application Form 2A .
NC0073539 Willowbrook WWTP Modified March 2021
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 ❑ML
0 MDL
Benzo(k)fluoranthene ❑ML
❑MDL
Bis(2-chloroethoxy)methane ❑ML
❑MDL
Bis(2-chloroethyl)ether 0 ML
❑MDL
Bis(2-chloroisopropyl)ether ❑ML
❑MDL
Bis(2-ethylhexyl)phthalate ❑ML
❑MDL
4-bromophenyl phenyl ether ❑ML
❑MDL
Butyl benzyl phthalate ❑ML
❑MDL
2-chloronaphthalene 0 ML
❑MDL
4-chlorophenyl phenyl ether ❑ML
❑MDL
Chrysene ❑ML
❑MDL
di-n-butyl phthalate ❑ML
❑MDL
di-n-octyl phthalate ❑ML
❑MDL
Dibenzo(a,h)anthracene 0 ML
❑MDL
1,2-dichlorobenzene ❑ML
❑MDL
1,3-dichlorobenzene ❑ML
_ ❑MDL
1,4-dichlorobenzene ❑ML
❑MDL
3,3-dichlorobenzidine ❑ML
❑MDL
Diethyl phthalate ❑ML
❑MDL
Dimethyl phthalate ❑ML
❑MDL
2,4-dinitrotoluene 0 ML
❑MDL
2,6-dinitrotoluene ❑ML
❑MDL
EPA Form 3510-2A(Revised 3-19) Page 16

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Modified Application Form 2A
NC0073539 Willowbrook WWTP Modified March 2021
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
1,2-diphenylhydrazine ❑ML
❑MDL
Fluoranthene 0 ML
❑MDL
Fluorene ❑ML
❑MDL
Hexachlorobenzene 0 ML
❑MDL
Hexachlorobutadiene 0 ML
❑MDL
Hexachlorocyclo-pentadiene ❑ML
❑MDL
Hexachloroethane ❑ML
❑MDL
Indeno(1,2,3-cd)pyrene ❑ML
❑MDL
Isophorone ❑ML
❑MDL
Naphthalene ❑ML
❑MDL
Nitrobenzene ❑ML
❑MDL
N-nitrosodi-n-propylamine ❑ML
❑MDL
N-nitrosodimethylamine ❑ML
❑MDL
N-nitrosodiphenylamine ❑ML
❑MDL
Phenanthrene ❑ML
❑MDL
Pyrene ❑ML
❑MDL
1,2,4-trichlorobenzene ❑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 O.See instructions and 40 CFR 122.21(e)(3).
EPA Form 3510-2A(Revised 3-19) Page 17

NPDES Permit Number Facility Name Outfall Number Modified Application Form 2A
NC0073539 Willowbrook WWTP Modified March 2021
TABLE D.ADDITIONAL POLLUTANTS AS REQUIRED BY NPDES PERMITTING AUTHORITY
Maximum Daily Discharge Average Daily Dischar e
Pollutant Analytical ML or MDL
(list) Value Units Value Units Number of Method1 (include units)
Samples
❑ No additional sampling is required by NPDES permitting authority.
❑ML
❑MDL
❑ML
0 MDL
0 ML
0 MDL
❑ML
❑MDL
❑ML
0 MDL
❑ML
❑MDL
0 ML
❑MDL
❑ML
❑MDL
❑ML
❑MDL
0 ML
❑MDL
❑ML
❑MDL
❑ML
❑MDL
❑ML
❑MDL
❑ML
0 MDL
❑ML
❑MDL
❑ML
0 MDL
❑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).
Page 18

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Willowbrook Subdivision WWTP Facility a,
NPDES Permit NC0073539 1
Location
Latitude: 35 26'38" Sub-Basin: 03-07-11 -,
Longitude: 80°49'09" Receiving Stream: Ramah Creek -*'-
Quad Name: Cornelius r� Mecklenburg County
Stream Class: C a/{� (Map not to scale)