NC0036269_Request for Intermediate Flow Tier_20210616

WSACC WATER&SEWER AUTHORITY
OF CABARRUS COUNTY
232 Davidson Hwy,Concord, NC 28027
1111111111..- 704.786.1783 • 704.795.1564 Fax
'1 Rocky River Regional WWTP
6400 Breezy Lane,Concord, NC 28025
704.788.4164 • 704.786.1967 Fax
IS0140012015♦NC Star Public Sector♦ISO450012018 www.wsacc.org
June 3, 2021
CERTIFIED MAIL
RETURN RECEIPT REQUESTED RECEIVED
Min Xiao, Environmental Engineer JUN 16 2021
North Carolina Department of Environmental Quality
512 North Salisbury Street NCDEQIDWRINPDES
1617 Mail Service Center
Raleigh, NC 27699-1617
Subject: NPDES #NC0036269 - Request for Intermediate Flow Tier
Rocky River Regional Wastewater Treatment Plant(RRRWWTP)
Dear Ms. Xiao:
As you know, the subject NPDES permit is currently in the process of being renewed. The
Water and Sewer Authority of Cabarrus County (WSACC) requests that an intermediate flow
tier of 30 million gallons per day (MGD) be added to the permit. Enclosed you will find the
pages of the NPDES renewal application forms that support this request. These provide a
layout and description of treatment works associated with the 30 MGD flow tier.
Driver: The previous version of the draft permit included flow tiers of 26.5 and 34 MGD. The
RRRWWTP triggered the 26.5 MGD flow tier limits during the last permit cycle and is
currently abiding by those limits. In 2020-21, flows to the facility increased more rapidly
than in past years, partly due to growth and partly due to wet weather. Therefore, WSACC
anticipates the need to accommodate flows in the 26.5-30 MGD range sooner than
previously expected. Although WSACC still plans a longer-term expansion to 34 MGD, an
intermediate (30 MGD) flow tier would allow the facility to perform less extensive
modifications sooner, and thereby accommodate the increased flows while planning for the
34 MGD expansion continues.
Schedule: WSACC expects to request an Authorization to Construct the 30 MGD expansion
within 2 years of writing, and to complete the expansion within 4 years of writing.
Ammonia Limits: WSACC has reviewed the ammonia limits that DEQ provided on April 27,
2021, which are based on site-specific ammonia targets developed from USEPA's 2013
ammonia criteria. We appreciate DEQ's willingness to provide site-specific ammonia limits.
In general, we believe these limits are very conservative due to the use of 90th percentiles
for all the inputs to the calculations, including effluent pH/temperature, river
pH/temperature, and background ammonia concentration. A more detailed statistical
evaluation would probably demonstrate implausibility of this combination of conditions for

-2-
the 30-day averaging period appropriate to the ammonia criteria used in the calculation.
This could be a topic for additional discussion with other stakeholders in the context of the
statewide permitting policy. In the meantime, WSACC is willing to accept the ammonia limits
proposed on April 27, 2021, which will help us move forward at the desired schedule.
CBOD5 Limits: It is our understanding that DEQ is performing additional investigation of the
technical basis of the draft CBOD5 limits associated with the 34 MGD flow tier. This also has
implications for how the CBOD5 limits would be set for the 30 MGD flow tier. If the technical
basis supports higher CBOD5 limits for the 30 MGD flow tier than the 34 MGD flow tier, this
would be WSACC's preference. However, schedule is a more pressing concern than these
potential differences in limits. If resolution of the technical basis of CBOD5 limits would
delay issuing the NPDES permit, WSACC would instead be willing to accept the same CBOD5
limits for 30 MGD flow tier as DEQ previously proposed for the 34 MGD flow tiers (e.g., 10
mg/L monthly average in summer).
Thank you for your consideration of this matter. If you have any questions or comments,
please feel free to contact either myself at 704.788.4164, ext. 111 or James Sims,
Wastewater Operations Manager/ORC at 704.788.4164, ext. 114 or [e-mail].
Sincerely,
T. Mark Fowler
Facilities Director
TMF/JF/akh
Enclosures: NPDES permit application pages
Table 2 EPA Application Form 2A Missing Information
cc: James Sims
File

Attachment A—Request for Missing Information
Table 2. EPA Application Form 2A Missing Information
40 CFR 122.21(j)(1)
1.1 Email address of facility contact: [e-mail]
1.2 Applicant email address: [e-mail]
1.3 Email address of the organization transporting the discharge for treatment prior to discharge
1.4 Email address of the organization receiving the discharge for treatment prior to discharge
1.5 Do you intend to request or renew one or more of the variances authorized at 40 CFR 122.21(n)?(Check all that apply. Consult
with your NPDES permitting authority to determine what information needs to be submitted and when.)
I I Discharges into marine waters(CWA Section ❑ Water quality related effluent limitation (CWA
301(h)) Section 302(b)(2))
❑X Not applicable
1.6 Email address of contractor responsible for operational or maintenance aspects of the treatment works
40 CFR 122.210)(6)
1.7 Indicate the number of Sills and NSCIUs that discharge to the POTW.
Number of SIUs Number of CIUs
15 2
40 CFR 122.22(a)and(d)
1.8 Certification Statement
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. 1 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
Signat Date signed

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
NC0036269 Rocky River Regional Wastewat OMB No.2040-0004
a�
Form U.S.Environmental Protection Agency
2A 3VEPA 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
Rocky River Regional Wastewater Treatment Plant
Mailing address(street or P.O.box)
6400 Breezy Lane
City or town State ZIP code
o Concord North Carolina 28025
Contact name(first and last) Title Phone number Email address
James Sims Wastewater Operations Maid [phone] [e-mail]
Location address(street,route number,or other specific identifier) m Same as mailing address
LL
City or town State ZIP code
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 4 SKIP to Item 1.4.
Applicant name
Water and Sewer Authority of Cabarrus County
Applicant address(street or P.O.box)
232 Davidson Highway
City or town State ZIP code
Concord North Carolina 28025
Contact name(first and last) Title Phone number Email address
fl Mark Fowler Facilities Director [phone] [e-mail]
a 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.)
Facility and applicant
❑ Facility ❑✓ 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.)
as
Existing Environmental Permits
°"Tcs' ✓❑ NPDES(discharges to surface ❑ RCRA(hazardous waste) ❑ UIC(underground injection
water) control)
NC0036369
2 ❑✓ PSD(air emissions) ❑ Nonattainment program(CAA) ❑✓ NESHAPs(CAA)
w Emergency Generator No.08�
.y ❑ Ocean dumping(MPRSA) ❑ Dredge or fill(CWA Section ❑✓ Other(specify)
404)
Air Permit No.04475R19
EPA Form 3510-2A(Revised 3-19) Page 1

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
NC0036269 Rocky River Regional Wastewat 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)
Charlotte Water 61,000 100 %separate sanitary sewer 0 Own ❑ Maintain
ei) 0 %combined storm and sanitary sewer 0 Own ❑ Maintain
d ❑ Unknown ❑ Own 0 Maintain
cn
100 %separate sanitary sewer 0 Own 0 Maintain
g Town of 19,395&2,121 %
0 combined storm and sanitary sewer ❑ Own ❑ Maintain
co
Harrisburg& © ❑ Unknown ❑ Own ❑ Maintain
o.
a City of 43,856 100 %separate sanitary sewer 0 Own ❑ Maintain
Kannapolis 0 %combined storm and sanitary sewer ❑ Own ❑ Maintain
al 0 Unknown ❑ Own ❑ Maintain
E
City of Concord 82,596
100 %separate sanitary sewer 0 Own ❑ Maintain
c17)> 0 %combined storm and sanitary sewer ❑ Own ❑ Maintain
c ❑ Unknown ❑ Own ❑ Maintain
dTotal 208,968
Population
c.) Served
Separate Sanitary Sewer System Combined Storm and
Sanitary Sewer
Total percentage of each type of cyo
sewer line(in miles) 1n % 0
1.8 Is the treatment works located in Indian Country?
o ❑ Yes 0 No
0
co 1.9 Does the facility discharge to a receiving water that flows through Indian Country?
a ❑ Yes ❑✓ No
1.10 Provide design and actual flow rates in the designated spaces. Design Flow Rate
26.5 mgd
To N Annual Average Flow Rates(Actual)
as - Two Years Ago Last Year This Year
re
c o 20.13 mgd 19.91 mgd 21.95 mgd
Maximum Daily Flow Rates(Actual)
o Two Years Ago Last Year This Year
59.74 mgd 54.15 mgd 66.47 mgd
0, 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
d a Constructed
a'F— Treated Effluent Untreated Effluent Combined Sewer Bypasses Emergency
.c Overflows Overflows
0
w
One
EPA Form 3510-2A(Revised 3-19) CZ �, rn�� Page 2

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
NC0036269 Rocky River Regional Wastewat 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 (check one)
Impoundment
❑ Continuous
gpd ❑ Intermittent
O Continuous
gpd ❑ Intermittent
❑ Continuous
gpd ❑ Intermittent
_2 1.14 Is wastewater applied to land?
❑ Yes D No 4 SKIP to Item 1.16.
0 1.15 Provide the land application site and discharge data requested below.
a Land Application Site and Discharge Data
o Continuous or
8 Location Size Average Daily Volume Intermittent
En Applied (check one)
acres d 0 Continuous
o gP 0 Intermittent
0 Continuous
acres gpd ❑ Intermittent
-a 0 Continuous
acres gpd ❑ Intermittent
?
= treatmentprior to discharge?
1.16 Is effluent transported to another facilityfor
�o 9
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) Q, � MC,6 Page 3

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
NC0036269 Rocky River Regional Wastewat 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.
c 2.2 Provide the treatment works'current average daily volume of inflow Average Daily Volume of Inflow and Infiltration
0
' and infiltration.
2,200,000 gpd
Indicate the steps the facility is taking to minimize inflow and infiltration.
An I&I policy has been in effect since 2004.Flow monitoring studies are on-going with the member jurisdictions to
3 determine sources of I&I.Improvements include,replacing deteriorated lines,lining pipe,and televising ten percent of
the sewer system annually.
c
s 2.3 Have you attached a topographic map to this application that contains all the required information?(See instructions for
specific requirements.)
� o
0
CL
❑✓ Yes ❑ No
E 2.4 Have you attached a process flow diagram or schematic to this application that contains all the required information?
E (See instructions for specific requirements.)
0 a)
o ❑✓ Yes ❑ No
2.5 Are improvements to the facility scheduled?
❑✓ Yes ❑ No SKIP to Section 3.
Briefly list and describe the scheduled improvements.
0
1 Replace Cell 1 mixer/aerators in Step 2 reactors.
c
I °1
2. New aeration basin and blower building,influent EQ tank and sidestream treatment,gravity thickening,effluent flume
0
0
3.
a
a�
U)
4.
a 2.6 Provide scheduled or actual dates of completion for improvements.
Scheduled or Actual Dates of Completion for Improvements
Q7 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 07/01/2021 09/30/2021 09/30/2021 09/30/2021
ai
2. 001 05/01/2022 05/01/2025 05/01/2025 08/01/2025
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:
Any applicable permits will be applied for at the appropriate times.
EPA Form 3510-2A(Revised 3-19) Page 5

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
NC0036269 Rocky River Regional Wastewat 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 North Carolina
m County Cabarrus
0 City or town Concord
0 Distance from shore N/A ft. ft. ft.
.Q
Depth below surface N/A ft. ft. ft.
Average daily flow rate 21.95 mgd mgd mgd
Latitude 35° 19' 30.5" N ° 0
Longitude 80° 32' 9.6" 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 Outfall Number Outfall Number
Number of times per year
o discharge occurs
a Average duration of each
`o discharge(specify units)
o Average flow of each mgd mgd mgd
cn discharge
in Months in which discharge
occurs
3.4 Are any of the outfalls listed under Item 3.1 equipped with a diffuser?
❑ Yes ❑✓ No -4 SKIP to Item 3.6.
CI, 3.5 Briefly describe the diffuser type at each applicable outfall.
Outfall Number Outfall Number Outfall Number
v
U,
ui 3 6 Does the treatment works discharge or plan to discharge wastewater to waters of the United States from one or more
discharge points?
❑✓ Yes ❑ No-3SKIP to Section 6.
EPA Form 3510-2A(Revised 3-19) 30 AkG? Page 6

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
NC0036269 Rocky River Regional Wastewatb 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 0 Unknown 0 Unknown
Service 14-digit
watershed code
(if known)
Name of state
cc management/river basin
U.S.Geological Survey 0 Unknown ❑ 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.CFECKLIST 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 0 w/process flow diagram
Information ❑ wl additional attachments
❑ w/Table A ❑ w/Table D
❑ Section 3: Information on ❑ w/Table B ❑ w/Table E
Effluent Discharges
❑ wl Table C ❑ w/additional attachments
o Section 4: Industrial ❑ w/SIU and NSCIU attachments ❑ w/Table F
co ❑ Discharges and Hazardous
Wastes ❑ w/additional attachments
�"— Section 5:Combined Sewer ❑ wl CSO map ❑ wl additional attachments
U ❑ Overflows C] wl CSO system diagram
Section 6:Checklist and
c ❑ Certification Statement ❑ w/attachments
Y 6.2 Certification Statement
U
N
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
c%L crtES 2—,ccTvZ.
Signature Date signed
13 (?AD a(
EPA Form 3510-2A(Revised 3-19) Page 12

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Water and Sewer Authority of Cabarrus County
State Grid/USGS Quad: F 16 SE/Concord SE, N.C.
Latitude: 35°19'35"N Permitted Flow: Phased 24 MGD, 34 MGD
Longitude: 80°32' 12"W Sub-basin: 03-07-12 NPDES Permit No. NC0036269
Cabarrus County
Receiving Stream: Rocky River Drainage Basin: Yadkin Pee Dee River Basin
North Carolina
Stream Class: C Drawing Date: 04-24-2008
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