HomeMy WebLinkAboutNC0047384_Modified_20200108 ROY COOPER
Governor *.,
MICHAEL S.REGAN
Secretary '.
LINDA CULPEPPER NORTH CAROLINA
Director Environmental Quality
January 8, 2020
Mr. Steven D. Drew
Director of Water Resources
County of Guilford
PO Box 3136
Greensboro, North Carolina 27402-3136
SUBJECT: Authorization to Construct
MODIFIED A to C No. 047384A07
Guilford County
T.Z. Osborne Water Reclamation Facility
NPDES Permit No. NC0047384
Dear Mr. Drew:
A letter of request to modify the previously issued Authorization to Construct permit
047384A07 was received January 7, 2020 by the Division of Water Resources (Division). The
final plans and specifications for the requested changes have been reviewed and found to be
satisfactory. Authorization is hereby granted for the construction of modifications to the existing
40 MGD T.Z. Osborne Water Reclamation Facility, with discharge of treated wastewater into the
South Buffalo Creek in the Cape Fear River Basin.
This MODIFIED permit and its Engineer's Certificate form replace the original permit and
Engineer's Certificate form issued May 8, 2017. Please discard the original permit and
Engineer's Certificate form.
This authorization results in an increase in design and permitted capacity to 56 MGD, and
is awarded for the construction of the following specific modifications:
Installation of six (6) new 1.66 MG 5 stage biological nutrient removal (BNR) aeration basins,
each basin consists of one (1) influent channel 5 HP vertical turbine mixer, three (3) pre-anoxic
zone 5 HP vertical turbine mixers,two(2)post-anoxic 10 HP vertical turbine mixers,one(1)7,800
GPM 3.8 ft TDH submersible NRCY pump with Variable Frequency Drive(VFD)and distribution
system,zone air diffuser array,piping, and controls;upgrade of existing four(4) 3.35 MG aeration
basins to 5 stage BNR system including the addition to each basin of two (2)post anoxic vertical
turbine mixers one (1) 10 HP and one 15 HP, modification of diffuser grids and additional grids
in aerobic and post anoxic cells, two (2) 7,800 GPM 3.7 ft TDH submersible NRCY pumps with
VFD and distribution system,piping, and controls; upgrade of existing eight(8) 1.66 MG aeration
basis to 5 stage BNR system including the addition to each basin of two (2) post anoxic 10 HP
vertical mixers,modification of diffuser grids and additional grids in aerobic and post anoxic cells,
DMNORTH CAROLINA
o.p.a.rn a E I d 1 w nr�
North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street 11611 Mail Service Center I Raleigh,North Carolina 27699-1611
919.707.3601
Mr. Steven D.Drew,Director of Water Resources
January 8,2020
Page 2 of 3
one (1) submersible 7,800 GPM at 3.8 ft TDH NRCY pump with VFD and distribution system,
piping, and controls; replace one (1) existing 22,600 icfin multi-stage blower with a 37,100 icfin
single-stage blower; installation of three(3) activated carbon odor scrubber systems,one(1)rated
for 7,800 SCFM, one(1) rated 8,200 SCFM, one (1) rated for 5,900 SCFM,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.
This MODIFIED ATC is issued in accordance with Part III,Paragraph A of NPDES Permit
No. NC0047384 issued 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.
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 Winston-Salem Regional Office,telephone number 336-776-9800, 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 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
Page 2 of 3
Mr. Steven D.Drew, Director of Water Resources
January 8, 2020
Page 3 of 3
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.
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 at
telephone number(919) 707-3644.
Sincerely,
Linda Culpepper
Director, Division of Water Resources
With Engineer's Certificate attached:
cc: DWR Winston-Salem Regional Office, Water Quality Programs
Central Files
ecopy: Christy Tommerdahl, P.E.
Hazen and Sawyer
Email: commerdahl@HazenandSawyer.com
NPDES File
Without Engineer's Certificate attached:
cc: Guilford County Health
Page 3 of 3
Guilford County
T.Z. Osborne Water Reclamation Facility
MODIFIED Authorization to Construct No. 047384A07
Issued January 8,2020
NPDES Permit No.NC0047384
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 Water Reclamation Facility,
located in Guilford 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 six(6)new 1.66 MG 5 stage biological nutrient removal (BNR)
aeration basins,each basin consists of one (1)influent channel 5 HP vertical turbine
mixer,three (3)pre-anoxic zone 5 HP vertical turbine mixers,two (2)post-anoxic 10
HP vertical turbine mixers,one (1) 7,800 GPM 3.8 ft TDH submersible NRCY pump
with Variable Frequency Drive (VFD)and distribution system,zone air diffuser
array,piping, and controls; upgrade of existing four(4)3.35 MG aeration basins to 5
stage BNR system including the addition to each basin of two (2)post anoxic
in mixers one (1) 10 HP and one 15 HP,modification of diffuser grids
vertical turbine e s
and additional grids in aerobic and post anoxic cells, two(2) 7,800 GPM 3.7 ft
TDH submersible NRCY pumps with VFD and distribution system,piping, and
controls; upgrade of existing eight(8) 1.66 MG aeration basis to 5 stage BNR system
including the addition to each basin of two(2)post anoxic 10 HP vertical mixers,
modification of diffuser grids and additional grids in aerobic and post anoxic cells,
one(1) submersible 7,800 GPM at 3.8 ft TDH NRCY pump with VFD and
distribution system,piping, and controls;replace one(1)existing 22,600 icfm multi-
stage blower with a 37,100 icfm single-stage blower; installation of three (3)
activated carbon odor scrubber systems,one (1)rated for 7,800 SCFM,one(1)rated
8,200 SCFM,one (1)rated for 5,900 SCFM,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 SEAL
NPDES Complex Permitting Unit
DEQ/DWR/Water Quality Programs
1617 Mail Service Center
Raleigh,NC 27699-1617