NC0036269_Authorization to Construct_20220427

North Carolina Department of Environmental Quality | Division of Water Resources
512 North Salisbury Street | 1611 Mail Service Center | Raleigh, North Carolina 27699-1611
919.707.9000

April 27, 2022

Mr. Chad VonCannon, PE
Engineering Director
Water and Sewer Authority of Cabarrus County
232 Davidson Highway
Concord, North Carolina 28027

SUBJECT: Authorization to Construct
A to C No. 036269A04
Water and Sewer Authority of Cabarrus County
Rocky River Regional WWTP
NPDES Permit No. NC0036269

Dear Mr. VonCannon:

A letter of request for an Authorization to Construct was received March 3, 2022, by the
Division of Water Resources (Division). With additional information received on April 27, 2022,
final plans and specifications for the subject project have been reviewed and found to be
satisfactory. Authorization is hereby granted for the construction of modifications to the existing
26.5 MGD Rocky River Regional WWTP, with discharge of treated wastewater into the Rocky
River in the Yadkin-Pee Dee River Basin.

This authorization results in an increase in design and permitted capacity to 30 MGD, and
is awarded for the construction of the following specific modifications:

Installation of one (1) prestressed concrete 4 MG flow equalization tank with four (4) 17.5
HP submersible mixers, one (1) prestressed concrete 1 MG Nitrification Enhancement
Facility equipped with coarse bubble diffusers with air supplied by three (3) 7,00 SCFM
rotary positive displacement blowers with Variable Frequency Drives (VFDs), one (1)
three-train Aeration Basin No. 6 including 0.65 MG anoxic zones with six (6) 5 HP
submersible mixers and 2.60 MG aerobic zones equipped with fine bubble diffusers with
air supplied by two (2) dedicated 4,743 SCFM high speed turbo blowers with VFDs and
one (1) swing 9,350 SCFM high speed turbo blower with VFD, and one (1) 8-foot throat
effluent Parshall flume; modification of the existing Chlorine Contact Basin No. 1 & No.
2 by raising the walls; installation of two (2) 275 GPM WAS pumps with VFDs, one (1)
new blower building with a blower room and an electrical room, and all necessary piping
and controls; in conformity with the project plans, specifications, and other supporting
documentation comprising the ATC Permit Application package submitted to the
Department of Environmental Quality.

Mr. Chad VonCannon, PE, Engineering Director
April 27, 2022
Page 2 of 3

This ATC is issued in accordance with Part III, Paragraph A of NPDES Permit No.
NC0036269 issued effective November 1, 2021, and shall be subject to revocation unless the
wastewater treatment facilities are constructed in accordance with the conditions and limitations
specified in Permit No. NC0036269.

It is the Owner’s responsibility to ensure that the as-constructed project meets the
requirements of all applicable regulations and statutes, the ATC Permit Application package, and
all of the requirements contained herein. Failure to comply may result in penalties in accordance
with North Carolina General Statute §143-215.6A through §143-215.6C.

The sludge generated from these treatment facilities must be disposed of in accordance
with G.S. 143-215.1 and in a manner approved by the Division.

In the event that the facilities fail to perform satisfactorily, including the creation of
nuisance conditions, the Permittee shall take immediate corrective action, including those as may
be required by the Division, such as the construction of additional or replacement wastewater
treatment or disposal facilities.

The Mooresville Regional Office, telephone number [phone], shall be notified at
least forty-eight (48) hours in advance of operation of the installed facilities so that an on-site
inspection can be made. Such notification to the regional supervisor shall be made during the
normal office hours from 8:00 a.m. until 5:00 p.m. on Monday through Frida y, excluding State
Holidays.

Upon completion of construction and prior to operation of this permitted facility, a
certification must be received from a Professional Engineer certifying that the permitted facility
has been installed in accordance with the NPDES Permit and the ATC Permit Application package.
Mail the Certification to: Division of Water Resources, WQ Permitting – NPDES, 1617 Mail
Service Center, Raleigh, NC 27699-1617.

Upon classification of the facility by the Certification Commission, the Permittee shall
employ a certified wastewater treatment plant operator to be in responsible charge (ORC) of the
wastewater treatment facilities. The operator must hold a certificate of the type and grade at least
equivalent to or greater than the classification assigned to the wastewater treatment facilities by
the Certification Commission.

The Permittee must also employ a certified back-up operator of the appropriate type and
grade to comply with the conditions of T15A:8G.0202. The ORC of the facility must visit each
Class I facility at least weekly and each Class II, III and IV facility at least daily, excluding
weekends and holidays, must properly manage the facility, must document daily operation and
maintenance of the facility, and must comply with all other conditions of T15A:8G.0202.

A copy of the project plans and specifications shall be maintained on file by the
Permittee for the life of the facility.

Mr. Chad VonCannon, PE, Engineering Director
April 27, 2022
Page 3 of 3

During the construction of the proposed additions/modifications, the Permittee shall
continue to properly maintain and operate the existing wastewater treatment facilities at all times,
and in such a manner, as necessary to comply with the effluent limits specified in the NPDES
Permit.

You are reminded that it is mandatory for the project to be constructed in accordance with
the North Carolina Sedimentation Pollution Control Act, and when applicable, the North Carolina
Dam Safety Act. In addition, the specifications must clearly state what the contractor’s
responsibilities shall be in complying with these Acts.

Prior to entering into any contract(s) for construction, the recipient must have obtained all
applicable permits from the State.

The issuance of this ATC does not preclude the Permittee from complying with any and
all statutes, rules, regulations, or ordinances which may be imposed by other government agencies
(local, state, and federal) which have jurisdiction.

If you have any questions or need additional information, please contact Min Xiao , PE at
telephone number [phone] or by email at [e-mail].

Sincerely,

for Richard E. Rogers, Jr.
Director, Division of Water Resources

by Min Xiao, PE
NPDES Industrial Permitting Unit

With Engineer’s Certificate attached:
cc: NPDES Files

ecopy: George Anipsitakis, P.E.
Brown and Caldwell
Email: [e-mail]
DWR Mooresville Regional Office, Water Quality Programs

Without Engineer’s Certificate attached:
cc: Mecklenburg County Health

Water and Sewer Authority of Cabarrus County
Rocky River Regional WWTP
Authorization to Construct No. 036269A04
Issued April 27, 2022
NPDES Permit No. NC0036269

Engineer's Certification

I, , as a duly registered Professional Engineer in
the State of North Carolina, having been authorized to observe (periodically/weekly/full time)
the construction of the modifications and improvements to the Rocky River Regional
Wastewater Treatment Plant, located in Mecklenburg County, hereby state that, to the best of my
abilities, due care and diligence was used in the observation of the following construction:

Installation of one (1) prestressed concrete 4 MG flow equalization tank with four
(4) 17.5 HP submersible mixers, one (1) prestressed concrete 1 MG Nitrification
Enhancement Facility equipped with coarse bubble diffusers with air supplied by
three (3) 7,00 SCFM rotary positive displacement blowers with Variable
Frequency Drives (VFDs), one (1) three-train Aeration Basin No. 6 including 0.65
MG anoxic zones with six (6) 5 HP submersible mixers and 2.60 MG aerobic
zones equipped with fine bubble diffusers with air supplied by two (2) dedicated
4,743 SCFM high speed turbo blowers with VFDs and one (1) swing 9,350
SCFM high speed turbo blower with VFD, and one (1) 8-foot throat effluent
Parshall flume; modification of the existing Chlorine Contact Basin No. 1 & No.
2 by raising the walls; installation of two (2) 275 GPM WAS pumps with VFDs,
one (1) new blower building with a blower room and an electrical room, and all
necessary piping and controls; in conformity with the project plans, specifications,
and other supporting documentation comprising the ATC Permit Application
package submitted to the Department of Environmental Quality.

I certify that the construction of the above referenced project was observed to be built within
substantial compliance, intent and in conformity with all applicable regulations and statutes and
the project plans, specifications, and other supporting documentation comprising the
Authorization to Construct Permit Application package.

Signature Registration No.____________________

Date__________________

Mail this Certification to: Attn: Min Xiao, PE
NPDES Industrial Permitting Unit
DEQ/DWR/Water Quality Programs
1617 Mail Service Center
Raleigh, NC 27699-1617