NC0021491_Authorization to Construct_20181008

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ROY COOPER NORTH CAROLINA
Governor Environmental Quality
MICHAEL S.REGAN
Secretory
LINDA CULPEPPER
Interim Director October 8, 2018
Mr. Leonard Barefoot
Interim Town Manager
Town of Mocksville
171 South Clement Street
Mocksville,North Carolina 27028
SUBJECT: Authorization to Construct
A to C No. 021491A02
Town of Mocksville
Dutchman Creek WWTP
NPDES Permit No.NC0021491
Dear Mr. Barefoot:
A letter of request for an Authorization to Construct was received June 29, 2018, 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 0.98 MGD Dutchman Creek WWTP, with discharge
of treated wastewater into the Dutchman Creek in the Yadkin-Pee Dee 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 new headworks consisting of one(1)new mechanical bar screen and one(1)
new manual bar screen with capacity to handle 3`.43 MGD at peak hourly flow each;
installation of new splitter box; installation of two (2) new 60 ft diameter by 14 ft side
water depth circular clarifiers; construction of new sludge pump station consisting of four
(4) new 230 GPM 7.5 HP submersible RAS pumps and two (2) new 125 GPM 3 HP
submersible WAS pumps; installation of two (2) new 122 GPM 10 HP scum pumps;
demolition of existing sludge drying bed; construction of one (1) new sludge thickening
building; installation of one (1) new rotary drum thickener rated for 59 dry lb/hour;
installation of one(1)new 253,662 gallons aerobic sludge digester;installation of three(3)
new positive displacement blowers with a minimum flow of 516 CFM at 6 psi each;
installation of new polymer feed system consisting of two (2) new 0.008 GPM diaphragm
polymer feed pumps and two (2) new 55 gallons polymer storage tanks; construction of
two (2) sludge loading stations; installation of all required pipe and controls; demolition of
two (2) existing clarifiers and decommissioning of third existing clarifier; demolition of
�DEQ�NORTH CAROLINA
Deportment al Environmental Duality
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. Leonard Barefoot,Interim Town Manager
October 8, 2018
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 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(919) 707-3610.
Sincerely,
BP1'",P2->
- i'Linda Culpepper
Interim Director, Division of Water Resources
With Engineer's Certificate attached:
cc: DWR Winston-Salem Regional Office, Water Quality Programs
Central Files
ecopy: Charles A. Willis, P.E.
Willis Engineers
Email: [e-mail]
NPDES File
Without Engineer's Certificate attached:
cc: Davie County Health
DWI/Trupti Desai
=D_EQ)NORTH GARQI,�NA
Depalme'rtol ronmmtnl OuN(ry
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

Town of Mocksville
Dutchman Creek WWTP •
NPDES No. NC0021491
Authorization to Construct No. 021491A02
Issued October 8,2018
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 Dutchman Creek WWTP, located
in Davie 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 headworks consisting of one (1)new mechanical bar screen
and one(1)new manual bar screen with capacity to handle 3.43 MGD at peak
hourly flow each; installation of new splitter box; installation of two (2)new 60 ft
diameter by 14 ft side water depth circular clarifiers; construction of new sludge
pump station consisting of four(4)new 230 GPM 7.5 HP submersible RAS
pumps and two (2)new 125 GPM 3 HP submersible WAS pumps; installation of
two (2) new 122 GPM 10 HP scum pumps; demolition of existing sludge drying
bed; construction of one (1)new sludge thickening building; installation of one
(1)new rotary drum thickener rated for 59 dry lb/hour; installation of one (1)new
253,662 gallons aerobic sludge digester; installation of three (3) new positive
displacement blowers with a minimum flow of 516 CFM at 6 psi each;
installation of new polymer feed system consisting of two (2)new 0.008 GPM
diaphragm polymer feed pumps and two (2)new 55 gallons polymer storage
tanks; construction of two (2) sludge loading stations; installation of all required
pipe and controls; demolition of two (2) existing clarifiers and decommissioning
of third existing clarifier; demolition of existing sludge pump stations; 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 /
7
Mail this Certification to: Attn: Bing Bai ��Q�
Complex Permitting Unit '
' DEQ/DWR/Water Quality Programs
1617 Mail Service Center
Raleigh,NC 27699-1617