NC0025453_Authorization to Construct_20190514

ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
LINDA CULPEPPER
Director
Mr. Adam Lindsay
Town Manager, Town of Clayton
PO Box 879
Clayton, North Carolina 27528
Dear Mr. Lindsay:
NORTH CAROLINA
Environmental Quality
May 14, 2019
SUBJECT: Authorization to Construct
A to C No. 025453A06
Town of Clayton
Little Creek WRF
NPDES Permit No. NCO025453
A letter of request for an Authorization to Construct was received on May 2, 2019, 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 2.5 MGD Little Creek WRF, with discharge of treated
wastewater into the Neuse River in the Neuse River Basin.
Please note: Town of Clayton must be able to demonstrate the legal ownership of the
proposed Regional Wastewater Pretreatment Facility, and submit all supporting documents
at the submittal of Engineer's Certificate.
This authorization results in no increase in design or permitted capacity and is awarded for
the construction of the following specific modifications:
Installation of new Regional Wastewater Pretreatment Facility (WWPTF) with
following components: two (2) 500,000 gallons flow equalization basins; one (1) new
bioreactor consisting of six (6) aerobic zones (2 @ 148,000 gallons, 2 @ 508,000
gallons and 2 @ 247,000 gallons), six (6) 118,000 gallons pre -anoxic zones, two (2)
200,000 gallons post anoxic zones, and two (2) 54,000 gallons post aeration zones;
two (2) 40 ft diameter by 13.65 ft side water depth secondary clarifiers; two (2) 100
square feet by 6 ft side water depth dissolved air flotation units; one (1) 1,452 square
ft by 8.5 ft side water depth gravity thickening tank; one (1) 100 GPM rotary drum
thickener; two (2) 500,000 gallons aerobic digesters; one (1) 2,600 dry lb/hour
dewatering centrifuge system; four (4) 250 GPM 3 HP submersible influent transfer
pumps; six (6) 500 GPM 5 HP submersible bioreactor internal recycle pumps; three
(3) 375 GPM 5.5 HP dry pit submersible RAS pumps; two (2) 120 GPM 1.6 HP dry
pit submersible WAS pumps; two (2) 100 GPM 3 HP submersible centrifugal
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North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street 1 1611 Mail Service Center I Raleigh, North Carolina 27699-1611
919.707.3601

Mr. Adam Lindsay, Town Manager
May 14, 2019
Page 2 of 4
secondary scum pumps; two (2) 110 GPM 7.5 HP positive displacement rotary lobe.
DAF float transfer pumps; one (1) 50 GPM 5 HP positive. displacement progressive
cavity_ thickened sludge transfer pump; three (3) 125 GPM 7.5 HP positive
displacement rotary lobe digester sludge pumps; two (2) .160 'GPM 7.5 HP positive
displacement rotary lobe DAF float .pumps; two (2) 280 GPM 10 HP positive.
displacement rotary lobe centrifuge feed pumps; two (2) 725 GPM 15 HP submersible
centrifugal process recycle pumps; four (4) 8.3 HP influent EQ tank mixers; eight (8)
2.1 HP bioreactor mixers; four (4) 2.7. HP aerobic digester mixers; two (2) 4 HP DAF
float mixers; three (3) -7.5- HP chemical storage tank mixers; one (1) 7.5 HP sludge
conditioning tank mixer; . six (6) 2 HP DAF mix . tank mixers; two (2) positive
displacement rotary blowers capable of providing 1,500 SUM at 8.7 psi; two (2)
positive displacement rotary blowers capable ,of providing 3,000 SCENT at 14.5 psi;
five (5) single statecentrifugal blowers capable of providing 3,650 SUM at 8.3 psig;
one (1) new 1;750 kW stand-by diesel generator, and all required VFDs, 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 ATC is. issued in accordance with. Part III, Paragraph A of NPDES Permit. No.
NCO025453 issued effective May 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. NC0025453.
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 Raleigh Regional Office, telephone number 919-791-4200, 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.
Page.2 of 4.

Mr. Adam Lindsay, Town Manager
May 14, 2019
Page 3 of 4
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.
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 Bing Bai at
telephone number [phone].
Sincerely,
-or Linda Culpepper
Director, Division of Water Resources
With Engineer's Certificate attached:
cc: DWR Raleigh Regional Office, Water Quality Programs
Page 3 of 4

Mr. Adam Lindsay, Town Manager.
May 14, 2019
Page 4 of 4 .
Central Files
ecopy: Eliezer Livay, P.E.
Senior Project Manager, Vice President
Email: [e-mail]
NPDES File
Without Engineer's Certificate attached:
cc: Johnston County Health
Page 4 of 4.

Town of Clayton
Little Creek WRF
Authorization to Construct No. 025453A06
Issued May 14, 2019
NPDES Permit No. NCO025453
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 Little Creek WRF, located in Johnston 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 new Regional Wastewater Pretreatment Facility (WWPTF) with
following components: two (2) 500,000 gallons flow equalization basins; one (1)
new bioreactor consisting of six (6) aerobic zones (2 @ 148,000 gallons, 2 @
508,000 gallons and 2 @ 247,000 gallons), six (6) 118,000 gallons pre -anoxic
zones, two (2) 200,000 gallons post anoxic zones, and two (2) 54,000 gallons post
aeration zones; two (2) 40 ft diameter by 13.65 ft side water depth secondary
clarifiers; two (2) 100 square feet by 6 ft side water depth dissolved air flotation
units; one (1) 1,452 square ft by 8.5 ft side water depth gravity thickening tank; one
(1) 100 GPM rotary drum thickener; two (2) 500,000 gallons aerobic digesters; one
(1) 2,600 dry lb/hour dewatering centrifuge system; four (4) 250 GPM 3 HP
submersible influent transfer pumps; six (6) 500 GPM 5 HP submersible bioreactor
internal recycle pumps; three (3) 375 GPM 5.5 HP dry pit submersible RAS
pumps; two (2) 120 GPM 1.6 HP dry pit submersible WAS pumps; two (2) 100
GPM 3 HP submersible centrifugal secondary scum pumps; two (2) 110 GPM 7.5
HP positive displacement rotary lobe DAF float transfer pumps; one (1) 50 GPM 5
HP positive displacement progressive cavity thickened sludge transfer pump; three
(3) 125 GPM 7.5 HP positive displacement rotary lobe digester sludge pumps; two
(2) 160 GPM 7.5 HP positive displacement rotary lobe DAF float pumps; two (2)
280 GPM 10 HP positive displacement rotary lobe centrifuge feed pumps; two (2)
725 GPM 15 HP submersible centrifugal process recycle pumps; four (4) 8.3 HP
influent EQ tank mixers; eight (8) 2.7 HP bioreactor mixers; four (4) 2.7 HP
aerobic digester mixers; two (2) 4 HP DAF float mixers; three (3) 7.5 HP chemical
storage tank mixers; one (1) 7.5 HP sludge conditioning tank mixer; six (6) 2 HP
DAF mix tank mixers; two (2) positive displacement rotary blowers capable of
providing 1,500 SCFM at 8.7 psi; two (2) positive displacement rotary blowers
capable of providing 3,000 SCFM at 14.5 psi; five (5) single state centrifugal
blowers capable of providing 3,650 SCFM at 8.3 psig; one (1) new 1,750 kW
stand-by diesel generator, and all required VFDs, 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.
All supporting documents for demonstration of Town of Clayton's legal ownership of the
new WWPTF are also attached to this certification.
Signature
No.
Date
Registration
Mail this Certification to: Attn: Bing Bai
Complex Permitting Unit
DEQ/DWR/Water Quality Programs
1617 Mail Service Center
Raleigh, NC 27699-1617