NC0021849_Authorization to Construct_20070202

Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
February 2, 2007
Mr. John Christensen, Town Manager
Town of Hertford
Post Office Box 32
Hertford, North Carolina 27944
SUBJECT:
Dear Mr. Christensen:
Alan W. Klimek, P.E. Director
Division of Water Quality
Modified Authorization to Construct
A to C No. 021849A01
Town of Hertford
Wastewater Treatment Plant Improvements
Perquimans County
Project No. E-SRG-T-01-0118
A letter of request for modified Authorization to Construct was received on January 16,
2007, by the 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 0.4 MGD Town of Hertford Wastewater Treatment Plant, with
discharge of treated wastewater into the Perquimans River in the Pasquotank River Basin.
This modified authorization results in an increase in the size of some selected treatment
units to accommodate a future expansion while the current increase in design and permitted
capacity remains at 0.7 MGD. This authorization is awarded for the construction of the
following specific modifications:
• demolition of existing headworks facility, by-pass box, aerobic digester, chlorine contact
chamber, and various manholes and yard piping,
• a new headworks facility to include dual mechanical bar screens rated at 2.5 MGD each,
dual Parshall flumes, a vortex grit chamber rated at 2.5 MGD and grit removal system,
• an influent pump station consisting of three (3) pumps -rated at 1,316 gpm each,
• 0.857 MG oxidation ditch consisting of three (3) concentric channels with an 11-foot side
water depth, with dual aeration disk rotor assemblies per channel (dual 20 Hp disk rotors in
outside channel, dual 40 Hp disk rotors in middle channel, and dual 40 Hp disk rotors in
inner channel),
• a distribution splitter box,
• retrofitting the scum box at existing secondary clarifier No. 1, to include replacement of the
scum pump,
• a new 36-foot diameter, 12-foot side water depth center -fed secondary clarifier (No. 2),
• a WAS pump station, including dual WAS pumps rated at 800 gpm each, One
No Carolina
atura!!y
North Carolina Division of Water Quality 1617 Mail Service Center Raleigh, NC 27699-1617 Phone [phone] Customer Service
Internet: h2o.enr.state.nc.us 512 N. Salisbury St. Raleigh, NC 27604 FAX [phone]
An Equal Opportunity/Affirmative Action Employer — 50% Recycled110% Post Consumer Paper

Mr. John Christensen, Town Manager
February 2, 2007
Page 2
• a 5,500 gallon caustic tank and associated chemical feed equipment,
dual automatic backwashing disk filters rated at 2.5 mgd each,
0 a chlorination disinfection system (using chlorine gas),
• dual chlorine contact tanks (27,500 gallons each),
• a dechlorination system (using sulfur dioxide gas),
• an effluent pump station consisting of three (3) 920 gpm, 45 Hp vertical turbine pumps, a
three-way control effluent valve, and effluent flowmeter,
• approximately 2,700 linear feet of 10-inch HDPE effluent forcemain and outfall diffuser in
the Perquimans River,
• a 55,000 gallon aerobic digester, with fine bubble diffusers, dual 148 scfm, 10 Hp blowers,
a 500 gpm, 5 Hp sludge pump, and telescopic overflow decanter,
• conversion of the existing 351,000 gallon aeration basin to a sludge holdir#g basin, with
fine bubble diffusers, dual 1,089 scfm, 60 Hp blowers, a 500 gpm, 15 Hp sludge loading
pump, and a telescopic overflow decanter,
• a sludge loading station (for trucks), and
• all necessary piping and appurtenances,
• three (3) 125 kW emergency generators with automatic transfer switches at the WWTP,
and
• associated electrical and instrumentation work,
pursuant to the applications received on February 2, 2004, and May 19, 2006, and in conformity
with the project plan, 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. NCO021849 issued February 5, 2003, and shall be subject to revocation
unless the wastewater treatment facilities are constructed in accordance with the conditions and
limitations specified in Permit No. NC0021849.
This Authorization To Construct is issued pursuant to T15A:2H.0219(p) for the
construction of a reclaimed water utilization facility without flow equalization at the site of the
Town of Hertford WWTP. In the event that non-compliance with any condition or limitation
contained in Permit No. WQ0021289 results from the absence of flow equalization, the Town's
NPDES permit may be administratively reopened, and a requirement for the construction of a
flow equalization basin may be incorporated into the permit.
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 North Carolina Division of Water Quality.
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 this Division, such as the construction of additional or replacement wastewater
treatment or disposal facilities.

Mr. John Christensen, Town Manager
February 2, 2007
Page 3
The Washington 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 Cecil G. Madden, Jr., P.E.,
Construction Grants & Loans, DWQ / DENR, 1633 Mail Service Center, Raleigh, NC 27699-
1633.
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 T 1 5A: 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.
Failure to abide by the requirements contained in this Authorization to Construct may
subject the Permittee to an enforcement action by the Division of Water Quality in accordance
with North Carolina General Statute 143-215.6A to 143-215.6C.

Mr. John Christensen, Town Manager
February 2, 2007
Page 4
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.
One (1) set of approved plans and specifications is being forwarded to you. If you have
any questions or need additional information, please contact Cecil G. Madden, Jr., P.E. at
telephone number [phone].
Sincerely,
an W. Klimek, P. .
kp:cgm
cc: E. Leo Green, Jr., P.E., Green Engineering, Wilson, NC
Perquimans County Health Department
DWQ Washington Regional Office, Surface Water Protection
DWQ/Point Source Branch, NPDES Program
DWQ/Technical Assistance and Certification Unit
Daniel Blaisdell, P.E.
Mark Hubbard, P.E.
Cecil G. Madden, Jr., P.E.
Ken Pohlig, P.E.
SRG

June 29, 2006
Mr. John Christensen, Town Manager
Town of Hertford
Post Office Box 32
Hertford, North Carolina 27944
SUBJECT:
Fear Mr. Christensen:
1llichael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department u" Environment and Natural Resources
Alan. W. Klimek, P.B. Director
Division of water Quality
Modified Authorization to Construct
A to C No. 021849AOI
Town of Hertford
Wastewater Treatment Plant Improvements
Perquimans County
Project No. E-SRG-T-01-0118
A letter of request for modified Authorization to Construct was received on May 19,
2006, by the 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 0.4 MGD Town of Hertford Wastewater Treatment Plant, with
discharge of treated wastewater, into the Perquimans River in the Pasquotank River Basin.
This modified authorization results in an increase in the size of some selected treatment
units to accommodate a future expansion while the current increase in design and permitted
In
capacity remains at 0.7 MGD. This authorization is awarded for the construction of the
following specific modifications:
demolition of existing headworks facility, by-pass box, aerobic digester, chlorine contact
chamber, and various manholes and yard piping,
-ID a new headworks facility to include dual mechanical bar screens rated at 2.5 MGD each,
dual Parshall flumes, a vortex grit chamber rated at 2.5 MGD and grit removal system,
a an influent pump station consisting .of three (3) pumps rated at 1,316 gpm each,
0 0.857 MG oxidation ditch consisting of three (3) concentric channels with an.11-foot side
water depth, with dual aeration disk rotor assemblies per channel (dual 20 Hp disk rotors in
outside channel, dual 40 Hp disk rotors in middle channel, and dual 40 Hp disk rotors in
inner channel),
0 a distribution splitter box,
® retrofitting the scum box at existing secondary clarifier No. 1, to include replacement of the
scum pump,
a new 36-foot diameter, 12-foot side water depth center -fed secondary clarifier (IIIo. 2),
® a WAS purnp station, including dual WAS pumps rated at 800 gpm each,
o„
NorthCarolina
,/Ulur'a!!if
North Carolina Division of Water Quality . 1617 Mail Service Center Raleigh, NC 27699-1617 Phone [phone] Customer Service
Internet: h2o.enr.state.nc.us 512 N. Salisbury St. Raleigh, NC 27604 FAX [phone]
An Equal Opportunity/Affirmative Action Employer - 50% Recycled/? 0% Post Consumer Paper

Mr. John Christensen, Town Manager
June 29, 2006
Page 2
0 a chlorination feed system for internal NVWTP algae maintenance,
0 a 5,500 gallon caustic tank and associated chemical feed equipment,
9 dual automatic backwashing disk filters rated at 2.5 mgd each,
0 a UV disinfection facility consisting of two (2) UV banks in parallel, each rated at 2.5 mgd,
a an effluent pump station consisting of three (3) 920 gpm, 45 Hp vertical turbine pumps, a
three-way control effluent valve, and effluent flowmeter,
0 approximately 2,700 linear feet of 10-inch HDPE effluent forcemain and outfall diffuser in
the Perquimans River,
® a 55,000 gallon aerobic digester, with fine bubble diffusers, dual 148 scfm, 10 Hp blowers,
a 500 gpm, 5 Hp sludge pump, and telescopic overflow decanter,
a conversion of the existing 351,000 gallon aeration basin to a sludge holding basin, with
fine bubble diffusers, dual 1,089 scfm, 60 Hp blowers, a 500 gpm, 15 Hp sludge loading
pump, and a telescopic overflow decanter,
® a sludge loading station (for trucks), and
all necessary piping and appurtenances,
three (3) 125 kW emergency generators with automatic transfer switches at the WWTP,
and
0 associated electrical and instrumentation work,
pursuant to the applications received on February 2, 2004, and May 19, 2005, and in conformity
with the project plan, 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. NCO021849 issued February 5, 2003, and shall be subject to revocation
unless the wastewater treatment facilities are constructed in accordance with the conditions and
limitations specified in Permit No. NC0021849.
This Authorization To Construct is issued pursuant to T1.5A:2H.0219(p) for the
construction of a reclaimed water utilization facility without flow equalization at the site of the
Town of Hertford WWTP. In the event that non-compliance with any condition or limitation
contained in Permit No. WQ0021289 results from the absence of flow equalization, the Town's
NPDES permit may be administratively reopened, and a requirement for the construction of a
flow equalization basin may be incorporated into the permit.
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 North Carolina Division of Water Quality.
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 this Division, such as the construction of additional or replacement wastewater
treatment or disposal facilities.

Mr. John Christensen, Town Manager
June 29, 2006
Page 3
The Washington 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 Cecil G. Madden, Jr., P.E.,
Construction Grants & Loans, DWQ / DENR, 1633 Mail Service Center, Raleigh, NC 27699-
1633.
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 I1,111 and IV facility at least daily, excluding
weekends and holidays, roust 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 NPDEES
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.
Failure to abide by the requirements contained in this Authorization to Construct may
subject the Permittee to an enforcement action by the Division of Water Quality in accordance
with North Carolina General Statute 143-215.6A to 143-215.6C.

Mr. John Christensen, Town Manager
June 29, 2006
Page 4
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.
One (1) set of approved plans and specifications is being forwarded to you. If you have
any questions or need additional information, please contact Cecil G. Madden, Jr., P.E. at
telephone number [phone].
Sincerely,
,,ATan W. Klimek, P.E.
kp:cgm
cc: E. Leo Green, Jr., P.E., Green Engineering, Wilson, NC
Perquimans County Health Department
DWQ Washington Regional Office, Surface Water Protection
DWQ/Point Source Branch, NPDES Program
DWQ/Technical Assistance and Certification Unit
Daniel Blaisdell, P.E.
Cecil G. Madden, Jr., P.E.
Ken Pohlig, P.E.
CIG
SRG