NC0047384_Authorization to Construct_20180321

ROY COOPER
Goner nor
` ' MICHAEL S. REGAN
Secretary
LINDA CULPEPPER
Water Resources Inter un Du ector
ENVIRONMENTAL QUALITY
March 21, 2018
Steve Drew
Director,Water Resources
City of Greensboro
2602 South Elm-Eugene Street
Greensboro,North Carolina 27405
SUBJECT: Authorization to Construct
A to C No. 047384A05 CORRECTED
City of Greensboro
T. Z. Osborne WRF
Dear Mr. Drew:
A letter of request for an Authorization to Construct was received October 6, 2014,by the
Division of Water Resources (Division), and final plans and specifications for the subject project
have been reviewed and found to be satisfactory. Additional clarification on the facility's design
intent was provided March 21, 2018 in which the Division determined a CORRECTED permit
was warranted. Therefore, a CORRECTED Authorization is hereby granted for the construction
of modifications to the existing 40 MGD T.Z. Osborne WRF,with discharge of treated wastewater
into the South Buffalo Creek in the Cape Fear River Basin. This CORRECTED permit supersedes
and replaces the 047384A05 permit issued November 7, 2014.
This authorization results in no increase in permitted capacity and is awarded for the
construction of the following specific modifications:
Demolition of existing traveling bridge tertiary filter components and retrofit of six(6)new
diamond cloth filter systems into the existing filter concrete structures, each system filter
area is 2,560 ft2 nominal 10 µm and is to include backwash pump and other filter support
features, specified filter system spare parts, piping, and controls; installation of one (1)
new chlorine contact chamber with dual 47.2 ft x 52 ft basins, influent channel, post
aeration cascade, effluent channel, parshall flume, single influent line liquid chlorination
injector/diffuser, single submerged liquid sodium sulfite solution diffuser,dual 600 GPM
at 42 ft THD 15 HP submerged drain pumps (one per basin), piping, and controls;
demolition of existing specified liquid chlorination feed system and installation of five(5)
new 80 GPH at 30 psi THD liquid chlorination solution metering pumps with direct DC
motor control,piping, and other controls; demolition of existing liquid sodium sulfite feed
system and installation of four(4)new 10 GPH at 30 psi THD liquid sodium sulfite solution
metering pumps with direct DC motor control, piping, and other controls; demolition of
existing PACL solution metering system and installation of six(6)new 120 GPH at 30 psi
THD PACL solution metering pumps with direct DC motor control, drip systems,piping,
and other controls; installation of one (1) new 36 ft diameter scum pre-concentrator with
State of North Carolina I Environmental Quality I Water Resources
512 N Salisbury Street 11617 Mail service Center I Raleigh,North Carolina 27699-1617
Phone [phone]

Mr. Steve Drew,Director of Water Resource
March 21, 2018
Page 2 of 4
mechanical rakes/baffles, surface sprays, overflow weir ring, one (1) 200 GPM at 14 ft
THD 2 HP drain pump,two (2) 150 GPM at 30 psi THD 10 HP pumps with VF drive, one
(1) 4 inch inline grinder 150 GPM 3 HP, piping, and controls; upgrade of (6) existing
primary settling tanks scum pumps, four (4) 400 GPM at 20 ft TDH 5 HP, two (2) 330
GPM at 14 ft THD 5 HP,piping, and controls; installation of new 54 inch diameter gravity
flow outfall line from existing junction box, adjacent to existing 54 inch outfall line,
including modification of the existing outfall structure and NPW piping to accommodate
second discharge pipe; in conformity with the project plans, specifications, and other
supporting data subsequently filed and approved by the Department of Environment and
Natural Resources.
This Authorization to Construct is issued in accordance with Part III, Paragraph A of
NPDES Permit No. NC0047384 effective July 1, 2014, and shall be subject to revocation unless
the wastewater treatment facilities are constructed in accordance with the conditions and
limitations specified in Permit No. NC0047384.
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 Winston-Salem 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 Friday, 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, this Authorization to Construct and the
approved plans and specifications. Mail the Certification to: NPDES Unit, DWR/DENR, 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 Tl5A: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

Mr. Steve Drew,Director of Water Resource
March 21, 2018
Page 4 of 4
If you have any questions or need additional information, please contact Bing Bai at
telephone number(919) 807-6389.
Sincerely,
-6141
alf2Linda Culpepper
Interim Director, Division of Water Resources
With Engineer's Certificate attached:
cc: DWR Winston-Salem Regional Office, Water Quality Programs
Central Files
ecopy: James Butcher, P.E.
CDM Smith
Email: [e-mail]
NPDES File
Without Engineer's Certificate attached:
cc: Guilford County Health Department

Mr. Steve Drew,Director of Water Resource
March 21, 2018
Page 3 of 4
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 approved plans and specifications shall be maintained on file by the Permittee
for the life of the facility.
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.
Failure to abide by the requirements contained in this Authorization to Construct may
subject the Permittee to an enforcement action by the Division in accordance with North Carolina
General Statute 143-215.6A to 143-215.6C.
The issuance of this Authorization to Construct 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.

City of Greensboro
T. Z. Osborne WRF
Authorization to Construct No. 047384A05 CORRECTED
Issued March 21, 2018
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 T. Z. Osborne Wastewater
Reclamation Facility, located in Guildford County, hereby state that, to the best of my abilities,
due care and diligence was used in the observation of the following construction:
Demolition of existing traveling bridge tertiary filter components and retrofit of six (6)
new diamond cloth filter systems into the existing filter concrete structures, each system
filter area is 2,560 ft2 nominal 10 gm and is to include backwash pump and other filter
support features, specified filter system spare parts, piping, and controls; installation of
one (1) new chlorine contact chamber with dual 47.2 ft x 52 ft basins, influent channel,
post aeration cascade, effluent channel, parshall flume, single influent line liquid
chlorination injector/diffuser, single submerged liquid sodium sulfite solution diffuser,
dual 600 GPM at 42 ft THD 15 HP submerged drain pumps (one per basin), piping, and
controls; demolition of existing specified liquid chlorination feed system and installation
of five (5) new 80 GPH at 30'psi THD liquid chlorination solution metering pumps with
direct DC motor control, piping, and other controls; demolition of existing liquid sodium
sulfite feed system and installation of four (4) new 10 GPH at 30 psi THD liquid sodium
sulfite solution metering pumps with direct DC motor control, piping, and other controls;
demolition of existing PACL solution metering system and installation of six (6)new 120
GPH at 30 psi THD PACL solution metering pumps with direct DC motor control, drip
systems, piping, and other controls; installation of one (1) new 36 ft diameter scum pre-
concentrator with mechanical rakes/baffles, surface sprays, overflow weir ring, one (1)
200 GPM at 14 ft THD 2 HP drain pump,two (2) 150 GPM at 30 psi THD 10 HP pumps
with VF drive, one (1) 4 inch inline grinder 150 GPM 3 HP, piping, and controls;
upgrade of(6) existing primary settling tanks scum pumps, four (4) 400 GPM at 20 ft
TDH 5 HP, two (2) 330 GPM at 14 ft THD 5 HP, piping, and controls; installation of
new 54 inch diameter gravity flow outfall line from existing junction box, adjacent to
existing 54 inch outfall line, including modification of the existing outfall structure and
NPW piping to accommodate second discharge pipe; in conformity with the project
plans, specifications, and other supporting data subsequently filed and approved by the
Department of Environment and Natural Resources.
Page 1 of 2

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 SEAL
/
Mail this Certification to: Attn: Bing Bai /
Complex Permitting Unit
DENR/DWR/Water Quality Programs
1617 Mail Service Center
Raleigh,NC 27699-1617