WQ0022870_Additional Information Request_20220913

ROY COOPER
Governor
ELIZABETH S. BISER
Secretary
RICHARD E. ROGERS, JR.
Director
NORTH CAROLINA
Environmental Quality
September 13, 2022
MICHAEL A. MELTON — ENGINEERING MANAGER
AQUA NORTH CAROLINA, INC
202 MACKENAN DRIVE
CARY, NORTH CAROLINA 27511
Subject: Application No. WQ0022870
Additional Information Request
Chapel Ridge WWTP
Reclaimed Water Generation and
Dedicated Utilization System
Chatham County
Dear Mr. Melton:
Division of Water Resources' Central and Regional staff has reviewed the application package
received June 28, 2022. However, additional information is required before the review may be completed.
Please address the items on the attached pages no later than the close of business on October 13, 2022.
Please be aware that you are responsible for meeting all requirements set forth in North Carolina
rules and regulations. Any oversights that occurred in the review of the subject application package are
still the Applicant's responsibility. In addition, any omissions made in responding to the outstanding items
in Sections A through I, or failure to provide the additional information on or before the above requested
date may result in your application being returned as incomplete pursuant to 15A NCAC 02T .0107(e)(2).
Please reference the subject application number when providing the requested information. All
revised and/or additional documentation shall be signed, sealed and dated (where needed), with an
electronic response submitted to my attention at: https://edocs.deq.nc.fzov/Forms/NonDischarge-Branch-
Submittal-Form-Ver2.
If you have any questions regarding this request, please contact me at [phone] or
[e-mail]. Thank you for your cooperation.
Sincerely,
CQcAer , 1 aaz"e4Adl
Erick Saunders, Engineer
Division of Water Resources
cc: Raleigh Regional Office, Water Quality Regional Operations Section (Electronic Copy)
Kevin Nash, PE — Rummel, Klepper & Kahl, LLP (Electronic Copy)
Laserfiche File (Electronic Copy)
D E Q�� North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street 1 1617 Mail Service Center I Raleigh, North Carolina 27699-1617
NORTH CAROLINA
oepammem of eammamemai uuahty /`� 919.707.9000

Mr. Michael A. Melton
September 13, 2022
Page 2 of 3
A. Cover Letter:
1. No comments.
B. Application Fee:
1. No comments.
C. Application:
1. No comments.
D. Engineering Plans:
Drawing C-1 of the engineering plans includes an existing site plan, but it does not include the
location of the existing manually cleaned bar screen. It is unclear whether this existing bar screen
is being removed, as there are not demolition notes or demolition items in the specifications. Please
clarify the location of the existing bar screen in this sheet and clarify whether this screen is to
remain in service, or if it is to be removed. If it is to be removed, please provide demolition notes
for this unit and any appurtenances.
2. Drawing C-2 indicates a screen bypass influent pipe in the proposed site plan which appears to lead
into the equalization basin. In accordance with 15A NCAC 02U .0402(g), by-pass and overflow
lines shall be prohibited. If this bypass line is to be granted, the permittee shall petition the Director
for alternative design criteria in accordance with 15A NCAC 02T .0105(n). This request shall
demonstrate that this alternative will provide:
a. Equal or better treatment of the waste;
b. Equal or better protection of the waters of the state; and
c. No increased potential for nuisance conditions from noise, odor, or vermin.
In accordance with 15A NCAC 02U .0201(c)(1), engineering plans for the entire system, including
treatment, storage, application, and utilization facilities and equipment except those previously
permitted unless those previously permitted are directly tied into the new units or are necessary to
understanding the complete process. The signed and sealed engineering plans for the system did
not include a full section view of the Ro9 300 microstrainer and associated components (such as
the mechanical bar screen bypass, dewatering chamber and screenings discharge). The
manufacturer's dimension information sheet that was provided did include this information, but
these were not signed and sealed and were separate from the submitted plan set. An updated
engineering plan set shall be submitted that is signed, sealed and dated by a North Carolina licensed
Professional Engineer in accordance with 02U .0201(c) and shall include a full detail of the screen
and includes all associated components (such as the dumpster for the screenings).

Mr. Michael A. Melton
September 13, 2022
Page 3 of 3
E. Specifications:
1. See Item D.1. Demolition specifications shall be provided for any components being removed that
are signed, sealed, and dated by a North Carolina licensed Professional Engineer in accordance
with 02U .0201(c).
2. The construction specifications in this application package does not include Division 11 —
Equipment or Division 16 — Electrical specifications pertaining to the installation of the mechanical
bar screen and associated components. Please provide specifications in accordance with 02U
.0201(c) that address materials to be used, methods of construction, and means for ensuring quality
and integrity of the finished product as they apply to these Divisions.
F. Engineering Calculations:
In accordance with 02U .0201(c)(3), engineering calculations, including hydraulic loading for each
treatment unit, treatment unit sizing criteria, hydraulic profile of the treatment system, and total
dynamic head calculations shall be provided and sealed by a North Carolina licensed Professional
Engineer. Please provide sizing and hydraulic profile calculations for this modification for our
review.
G. Site Mai):
1. No comment.
H. Power Reliability Plan:
1. The proposed modification will include additional components requiring power. Is the permanent
standby generator with automatic transfer switch detailed in the permit description adequate for
powering this treatment unit?
I. Operation & Maintenance (O&M) Plan:
1. An O&M plan was not provided with this application to include the operational functions of the
new system and any anticipated maintenance activities for the new equipment. Please provide an
updated O&M Plan that meets the requirements of 15A NCAC 02U. 0801.