NC0047597_Authorization to Construct_20211124

City of Durham
South Durham WRF
A To C No.047597A0 1
Issued November 8, 2013
Engineer's Certification
II , as a duly re
t'tb the State of North Carolina, havinglbeen aued to observe
the construction of the modifications and improvements to the South
Facility, located in Durham County, hereby state that, to the best of my abilities, due care and
diligence was used in the observation of the following construction:
RECEIVED
NOV 302021
NCDEQ/DWR/NPDES
I, POCtf 1Ciq lyrnQ
ofessional Engineer in
/weekly/full time)
urham Water Reclamation
Installation of a new Carbon Source Additive Bulk Storage Containment Area design for
two (2) 15,000 gallon tanks (initially two (2) 10,000 gallon tanks will be installed), truck
unloading station, strainer, containment recovery sump with 30 gpm pump; new Carbon
Source Additive Chemical Feed Building with one (1) 75 gpm carbon source additive
bulk storage circulation/transfer pump, multiple carbon source additive metering feed
pumps with strainer system; new Caustic Bulk Storage Containment Area with two (2)
9,000 gallon tanks, truck unloading station, containment recovery sump with 30 gpm
pump; new Caustic Chemical Feed Building with two (2) 75 gpm caustic bulk storage
circulation/transfer pumps, multiple caustic metering feed pumps with strainer system;
modification/upgrade existing Alum Bulk Storage Containment Area and Alum Chemical
Feed Building with new truck unloading station, new multiple alum metering feed pumps
with strainer system; modification/upgrade of eight (8) aeration basins air distribution
and controls to new configurations, Cell #1 through the second drop leg Cell#4, third
drop leg Cel1#4 through Ce11#7; new filter press wastewater two (2) cell nitrogen removal
MBBR (Moving Bed Biofilm Reactor) system with mixers and air spargers, one (1)
300,700 gallon EQ basin with two (2) submerged mixers, two (2) 150 gpm influent feed
pumps, two (2) 30 gpm drain sump pumps; new 400 gpm truck loading Bulk Reuse
Distribution Facility, load out meter, containment load area with recovery sump, reuse
Chlorinator Feed system; in conformity with the project plans, specifications, ad other
supporting data subsequently filed and approved by the Department of Environment and
Natural Resources.
I certify that the construction of the above referenced project was observed to be built
within substantial compliance and intent of the approved plans and specifications.
Signature .. jf� Registration No. Ogi-C /
Date ilDL
Send to:
Construction Grants & Loans
DENR/DWQ
1633 Mail Service Center
Raleigh, NC 27699-1633

ATA
RUDENR
North Carolina Department of Environment and Natural Resources
Division of Water Resources
Water Quality Programs
Pat McCrory Thomas A. Reeder John E. Skvarla, III
Governor Director Secretary
November 8, 2013
Mr. Don Greely
Director of Water Management
City of Durham
101 City Hall Plaza
Durham, North Carolina 27701
SUBJECT: Authorization to Construct
A to C No. 047597A01
City of Durham
South Durham WRF
Dear Mr. Greely:
A letter of request for an Authorization to Construct was received September 21, 2013,
by the Division of Water Resources (Division), and 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 20.0 MGD South Durham WRF, with discharge of
treated wastewater into an unnamed tributary to New Hope Creek in the Cape Fear River Basin.
This authorization results in no increase in design or permitted capacity and is awarded
for the construction of the following specific modifications:
Installation of a new Carbon Source Additive Bulk Storage Containment Area design for
two (2) 15,000 gallon tanks (initially two (2) 10,000 gallon tanks will be installed), truck
unloading station, strainer, containment recovery sump with 30 gpm pump; new Carbon
Source Additive Chemical Feed Building with one (1) 75 gpm carbon source additive
bulk storage circulation/transfer pump, multiple carbon source additive metering feed
pumps with strainer system; new Caustic Bulk Storage Containment Area with two (2)
9,000 gallon tanks, truck unloading station, containment recovery sump with 30 gpm
pump; new Caustic Chemical Feed Building with two (2) 75 gpm caustic bulk storage
circulation/transfer pumps, multiple caustic metering feed pumps with strainer system;
modification/upgrade existing Alum Bulk Storage Containment Area and Alum Chemical
Feed Building with new truck unloading station, new multiple alum metering feed pumps
with strainer system; modification/upgrade of eight (8) aeration basins air distribution
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
Location: 512 N. Salisbury St Raleigh, North Carolina 27604
Phone: [phone] l Fax: [phone]
Internet: www.ncwateruualitv.orq
An Equal OpportunityWffirmative Action Employer

Mr. Don Greely
November 8, 2013
Page 2 of 3
and controls to new configurations, Cell# 1 through the second drop leg Ce11#4, third drop
leg Cell#4 through Ce11#7; new filter press wastewater two (2) cell nitrogen removal
MBBR (Moving Bed Biolfilm Reactor) system with mixers and air spargers, one (1)
300,700 gallon EQ basin with two (2) submerged mixers, two (2) 150 gpm influent feed
pumps, two (2) 30 gpm drain sump pumps; new 400 gpm truck loading Bulk Reuse
Distribution Facility, load out meter, containment load area with recovery sump, reuse
tablet Chlorinator Feed System; 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. NC0047597 issued February 1, 2013, and shall be subject to revocation
unless the wastewater treatment facilities are constructed in accordance with the conditions and
limitations specified in Permit No. NC0047597.
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 Raleigh 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 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

City of Durham
Authorization to Construct No. 047597A01
' November 8, 2013
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 South Durham WRF, located in
Durham 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 a new Carbon Source Additive Bulk Storage Containment Area design for
two (2) 15,000 gallon tanks (initially two (2) 10,000 gallon tanks will be installed), truck
unloading station, strainer, containment recovery sump with 30 gpm pump; new Carbon
Source Additive Chemical Feed Building with one (1) 75 gpm carbon source additive bulk
storage circulation/transfer pump, multiple carbon source additive metering feed pumps
with strainer system; new Caustic Bulk Storage Containment Area with two (2) 9,000
gallon tanks, truck unloading station, containment recovery sump with 30 gpm pump; new
Caustic Chemical Feed Building with two (2) 75 gpm caustic bulk storage
circulation/transfer pumps, multiple caustic metering feed pumps with strainer system;
modification/upgrade existing Alum Bulk Storage Containment Area and Alum Chemical
Feed Building with new truck unloading station, new multiple alum metering feed pumps
with strainer system; modification/upgrade of eight (8) aeration basins air distribution and
controls to new configurations, Cell#1 through the second drop leg Cell#4, third drop leg
Cell#4 through Cell#7; new filter press wastewater two (2) cell nitrogen removal MBBR
(Moving Bed Biolfilm Reactor) system with mixers and air spargers, one (1) 300,700 gallon
EQ basin with two (2) submerged mixers, two (2) 150 gpm influent feed pumps, two (2) 30
gpm drain sump pumps; new 400 gpm truck loading Bulk Reuse Distribution Facility, load
out meter, containment load area with recovery sump, reuse tablet Chlorinator Feed System;
in conformity with the project plans, specifications, and other supporting data subsequently
filed and approved by the Department of Environment and Natural Resources.
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: Ron Berry
Complex Permitting Unit
DENR/DWR/Water Quality Programs
1617 Mail Service Center
Raleigh, NC 27699-1617

Mr. Don Greely
November 8, 2013
Page 3 of 3
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.
If you have any questions or need additional information, please contact Ron Berry at
telephone number [phone].
cc: Ms. Patricia Drummey Stiegel, P.E.
Hazen and Sawyer, P.C.
4011 WestChase Blvd
Suite 500
Raleigh, North Carolina 27607
Durham County Health Department
DWR/Raleigh Regional Office, Water Quality Programs
Central Files
NPDES File