NC0023965_Application_20040219

CITY OF WILMINGTON
PUBLIC UTILITIES DEPARTMENT
February 19, 2004
NCDENR
Division of Water Quality
NPDES Unit
1617 Mail Service Center
Raleigh, N.C. 27699-1617
Attn: Dave Goodrich
Re: City of Wilmington
Northside WWTP Expansion/Upgrade
NPDES and Authorization to Construct Submittals
Dear Sir:
P.O. Box 1810
WILMINGTON, NC 28402
TDD [phone]
ti00z 0 6 ' n J
B 2 0 2004
FE
McKim and Creed Engineers are hereby authorized to submit plans, specifications,
applications and other supporting documents on behalf of the City of Wilmington for the
purpose of the NPDES permit and Authorization to Construct for the referenced project.
Yours truly,
Hugh T. Caldwell, P.E.
Public Utilities Director
Cc: Ken Vogt, Wastewater Treatment Superintnedent
Tony Boahn, McKim and Creed Engineers
ADMINISTRATION ENVIRONMENTAL SERVICES UTILITY SERVICES WASTEWATER TREATMENT WATER TREATMENT
VOICE [phone] VOICE [phone] VOICE [phone] LOUGHUN PLANT MAFFITT PLANT VOICE [phone]
FAX [phone] FAX [phone] FAX [phone] VOICE [phone] VOICE [phone] FAx [phone]
FAX [phone]

MCKIM & CREED
January 29, 2004 M&C 0824-0059 (40)
Mr. David A. Goodrich
NCDENR - Division of Water Quality
Attention: NPDES Unit
1617 Mail Service Center
Raleigh NC 27699-1617
Re: City of Wilmington
James A. Loughlin Wastewater Treatment Facility (NPDES Permit Number NC0023965)
NPDES Permit Application Submittal
Additional Information
Dear Mr. Goodrich:
Upon review of the NPDES permit submittal package for the James A. Loughlin Wastewater
Treatment Facility (cover letter dated January 26, 2004), it was discovered that the Process Flow
Schematic submitted was for the existing plant configuration only. Please find enclosed three
(3) copies of the Process Flow Schematic for the proposed 8.0 MGD to 16.0 MGD expansion. We
request that these items be incorporated as part of the original submittal package.
If you have any questions or require further information, please do not hesitate to contact me.
Sincerely,
McKim & Creed, P.A.
Tony oa
Sr. Project Manager
Enclosures
cc: Hugh T. Caldwell, P.E., City of Wilmington
Kenneth L. Vogt, Jr., P.E., City of Wilmington
S:1082410059140-Permit1012904 Letter to Dave Goodrich.doc
243 NORTH FRONT STREET, WILMINGTON, NORTH CAROLINA 28401
TEL [phone] FAX [phone] www.mckimcreed.com
AA0002667

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CITY OF WILMINGTON
PUBLIC UTILITIES DEPARTMENT
January 23, 2004
Mr. David A. Goodrich
Division of Water Quality
NCDENR
1601 Mail Service Center
Raleigh, NC 27699-1601
P.O. Box 1810
WILMINGTON, NC 28402
TDD [phone]
J„N 2 0 2004
Re: James A. Loughlin (Northside) Wastewater Treatment Plant NPDES Permit Special Conditions
Dear Mr. Goodrich:
During discussions with you and Joe Corporon in Wilmington last month concerning the
NPDES permit for the above referenced facility we were directed to include with the permit
application any proposed special conditions covering issues of critical concern to the City and
County. We have prepared special conditions for three key issues: (1) acknowledging the City's
current mass load allocation and the significant loss of mass load allocations involved in
receiving a NPDES permit containing DWQ's policy -based BOD (5 mg/1) and NH3 (1 mg/1)
limits; (2) use of phased limits until DWQ's Cape Fear River Estuary (CFRE) TMDL process is
completed; (3) complete avoidance of any anti -backsliding controversy.
The City's modeling has demonstrated no appreciable water quality improvement would
result from imposing DWQ's policy -based limits within the NPDES permit for the NSWWTP
Expansion/Upgrade. Indeed, recent trends reveal decreasing load contributions from the
estuary's point sources has not produced a corresponding improvement in estuary water quality.
Thus, there is no significant technical driving force for DWQ to impose and for the City to
accept the loss of allocation associated with policy -based limits at this time.
DWQ is currently involved in a TMDL process within the CFRE over the next 1 — 2
years which further compounds the present uncertainty of assimilative capacity and load
allocation needed to improve estuary water quality. Use of phased limits would be a reasonable
means of accomplishing our mutual goals until such process is completed.
Finally, imposition of final policy -based limits without benefit of the final CFRE TMDL
puts us at risk of violating anti -backsliding provisions within existing laws and regulations
should the TMDL recommend an allocation other than current policy based limits. A prudent
strategy for both parties would be to avoid this issue completely through utilization of phased
limits.
ADMINISTRATION ENVIRONMENTAL SERVICES UTILITY SERVICES WASTEWATER TREATMENT WATER TREATMENT
VOICE [phone] VOICE [phone] VOICE [phone] LOUGHLIN PLANT MAFRTT PLANT Vacs [phone]
FAX [phone] FAX [phone] Fax [phone] Vacs [phone] Vacs [phone] FAX [phone]
FAX [phone]

Mr. David A. Goodrich
January 23, 2004
Page Two
Despite our concerns and the uncertainties described herein, the City and County have
committed to proceed with making the improvements necessary to expand the NSWWTP to 16
MGD with the capability to meet DWQ's policy -based limits when necessary. It is our hope that
this excess capability could be effectively used within a future waste load trading program.
The sections which follow present the special conditions which we believe address our
issues of concern while still meeting the DWQ objective of protecting water quality in the lower
Cape Fear River. We request that these conditions be included in the final NPDES Permit
language for the City's Northside WWTP.
Northside NPDES Permit Special Conditions
Issue: Preservation of mass load allocation (the proposed policy based limits result in a 90%
loss of NH3-N allocation and 60% loss of BOD allocation)
Proposed Permit Condition: NCDENR recognizes that prior to issuance of this new permit, the
City of Wilmington James A. Loughlin Wastewater Treatment Facility was operating in
compliance with applicable law, regulations and permits with secondary limits of 8 MGD flow,
30 mg/1 BOD5, 30 mg/1 TSS and no limit for NH3. These limits translate to a mass load of 365
Tons Per Year (TPY) BOD5, 365 TPY TSS and 244 TPY NH3 (assuming 20 mg/1 typical
secondary treatment value). The mass load described in this paragraph will be one factor of
consideration by NCDENR when considering future waste load allocations resulting from a
TMDL process or when considering future expansion requests for the James A. Loughlin facility.
Issue: Phased Limits
Proposed Permit Condition: Assimilative capacity within the Cape Fear River estuary has not
been established with any degree of certainty. Moreover, certain areas within the estuary have
been classified as impaired, are 303(d)-listed, and are the subject of TMDL establishment. The
Permittee has functioned as a regional facility and has accepted wastewater from small facilities
with high concentrations of BOD and NH3 as N. Such regionalization is beneficial in reducing
the total discharge of BOD and NH3 as N to the Cape Fear River. In order to continue the
benefits of regionalization and avoid being unduly restrictive without good cause and sound
scientific justification, and, in particular, taking such action lacking completion of the TMDL
process, NCDENR hereby approves the imposition of phased limits as follows:
1. Until the assimilative capacity/waste load allocation/TMDL process is completed and
resolved;
16 MGD; 15 mg/1 BOD5; 30 mg/1 TSS; 10 mg/1 NH3 N operation and effluent limits.
2. Upon completion and resolution of the assimilative capacity/waste load allocation/TMDL
process, the operation and effluent limits may be adjusted to 16 MGD; 5 mg/1 BOD; 30
mg/1 TSS;1 mg/1 NH3 or to values in between these and the interim limits as technically
supported by the outcome of such process.

Mr. David A. Goodrich
January 23, 2004
Page Three
Issue: Anti -backsliding
Proposed Permit Condition: This permit may be modified or renewed with less stringent
limitations for BOD5 and NH3 as N than those set out herein if the circumstances on which this
permit is predicated/issued have materially and substantially changed, there are material and
substantial changes to the facility, new information becomes available (such as the determination
of a TMDL), or new regulations are promulgated. Since the provision for adjustment of such
limits is a condition of this permit, NCDENR agrees that it will not consider such a modification
to be in violation of any anti -backsliding provisions of applicable law(s) and regulation(s). If the
Permittee submits information to the regulatory agency relevant to the four previously -cited
criteria pursuant to 40 CFR 122.62 and 122.44, including but not limited to new information
based on calibrated modeling or similarly reliable studies of the Cape Fear River basin, the
regulatory agency shall within a reasonable time review such information and issue a written
determination whether, based upon these criteria, it supports the modification of this permit with
less stringent limits for BOD5 and NH3 as N. If so, it shall identify the proposed new limits; if
not, it shall provide the technical basis for refusing consideration of less stringent limits,
including the identification of the specific technical basis cited by the regulatory agency in
support of its refusal and any actions which could be taken by the Permittee for remedying these
issues.
After you have completed your review we would appreciate a written response
concerning the issues presented. If any of the above special conditions are determined not to be
acceptable to NCDENR, then we respectfully request a reason for not including that condition
and alternative language that would be acceptable if applicable.
Yours very truly,
Hugh T. Caldwell, P.E.
Director of Public Utilities
cc: Sterling Cheatham, City Manager
Allen O'Neal, County Manager
Wyatt Blanchard, County Engineer
Ken Vogt, Superintendent of Wastewater Treatment
Tom Pollard, City Attorney

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PLOT DATE 06/25/03 2:09pm FILES H:\30374\NORTHSIDEVIGURES\001 by PLAWANSON XREF FILE a NONE
CLARIFIER
DISTRIBUTION
BOX
COUNTY
INFLUENT
WASTEWATER
BAR SCREENS/
GRIT REMOVAL
FACILITY
CITY
INFLUENT
WASTEWATER
PRIMARY
CLARIFIER
PRIMARY
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INTERMEDIATE
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CITY OF WILMINGTON
NORTHSIDE WASTEWATER TREATMENT PLANT

City of Wilmington, North Carolina
James A. Loughlin WWTP
Water Balance
Narrative Description
The City of Wilmington has several remote wastewater pump stations that serve the James A.
Loughlin WWTP. Flow enters the WWTP site via three force mains which combine at the new
screening/grit removal facility.
Preliminary treatment effluent (PTE) flows by gravity to two primary clarifiers. A primary clarifier
bypass line is provided. Primary sludge and primary scum are pumped to the anaerobic
digesters.
Primary effluent (PE) flows by gravity to the new aeration tanks where it combines with return
activated sludge (RAS) from the RAS pump stations. The mixed liquor (ML) is distributed to the
aeration tanks for biological treatment.
The effluent from the aeration tanks is distributed proportionally to the four secondary clarifiers.
RAS is pumped back to the aeration tanks by RAS pump stations 1 and 2. Waste activated
sludge is wasted out of the RAS pump station discharge header and is gravity belt thickened prior
to pumping to the anaerobic digesters.
Secondary clarifier effluent (SCE) flows by gravity to the new tertiary filters. Backwash reclaim
water from the filters is returned to the head of the aeration tanks.
Filtered effluent flows by gravity to the UV disinfection facility. The plant effluent is disinfected in
four UV channels and is metered with a parshall flume at this location.
UV effluent flows to the two effluent pump stations which pump plant effluent to the Cape Fear
River. Either of the two pump stations have adequate capacity to pump the design average plant
effluent flow of 16 mgd. At the hydraulic peak flow of 40 mgd, both stations are required.

Water Balance
Facility Average Flow
Influent Screening Facilities (3 screens)
Flow to Process 16.0 mgd
Flow to Each Unit 5.3 mgd
Grit Removal Facilities (3 grit collectors)
Flow to Process 16.0 mgd
Flow to Each Unit 5.3 mgd
Primary Clarifiers (2 clarifiers)
Flow to Process 16.0 mgd
Flow to Each Unit 8.0 mgd
Aeration Tanks (4 tanks)
Primary Effluent Flow 16.0 mgd
Return Activated Sludge Flow 16.0 mgd
Total Mixed Liquor Flow to Aeration Tanks 32.0 mgd
Flow to Each Unit 8.0 mgd
Secondary Clarifiers (4 clarifiers)
Mixed Liquor Flow to Clarifiers 32.0 mgd
Mixed Liquor Flow to Clarifier 1 or 2 5.2 mgd
Secondary Effluent Flow from Clarifier 1 or 2 2.6 mgd
Mixed Liquor Flow to Clarifier 3 or 4 10.8 mgd
Secondary Effluent Flow from Clarifier 3 or 4 5.4 mgd
Tertiary Filters (4 filters)
Secondary Effluent Flow to Filters 16.0 mgd
Flow to Each Unit 4.0 mgd
Ultraviolet Disinfection (4 channels)
Flow to Process 16.0 mgd
Flow to Each Unit 4.0 mgd
Effluent Pump Stations
Total Plant Effluent Flow 16.0 mgd
Flow to Each Station See attached narrative

\N A 7'F Michael F. Easley, Governor
9QWilliam G. Ross Jr., Secretary
G North Carolina Department of Environment and Natural Resources
r Alan W. Klimek, P. E. Director
Division of Water Quality
Coleen H. Sullins, Deputy Director
Division of Water Quality
December 31, 2003
Mr. Hugh Caldwell, Director
Public Utilities Department
City of Wilmington
305 Chestnut Street
Wilmington, NC 28401
JAN - 2 2004
Re: City of Wilmington's Northside Wastewater Treatment Plant Upgrade and Expansion
Dear Mr. Caldwell:
The NC Environmental Policy Act review for the subject project is complete. The Department of
Administration has concluded that your response to issues raised by the Cape Fear River Watch
in their letter of 31 October 2003 has satisfied the review requirements of the Act (see attached
letter from the Clearinghouse).
Permit applications covering activities associated with this project may now proceed. The
applications should be consistent with the Finding of No Significant Impact issued by the
Division of Water Quality on 7 October 2003 (attached).
Should you have any questions, I may be contacted at 919.733.5083 x555.
Sincerely,
Alex arks, AICP
Environmental Specialist
CC: Melba McGee (w/o attach.)
Kim Williams (w/ attach.)
Dave Goodrich (w/ attach.)
John Donley (w/ attach.)
Rick Shiver (w/ attach.)
N. C. Division of Water Quality 1617 Mail Service Center Raleigh, North Carolina 27699-1617 [phone]
NCDENtt
Customer Service
1-877-623-6748

i
North Carolina
Department of Administration
Michael F. Easley, Governor Gwynn T. Swinson, Secretary
December 23, 2003
Mr. Alex Marks
DENR, Div. of Water Quality
1617 MSC
Raleigh, NC 27699-1617
Dear Mr. Marks:
Re: SCH File = 04-E-4300-0096; Environmental Assessment/Finding of No Significant Impact; City
of Wilmington - Proposed Upgrade and Expansion of the Northside Wastewater Treatment Plant;
Expand Treatment Capacity from 8 MGD to 16 MGD
The above referenced envii onmental impact information has been reviewed through the State
Clearinghouse under the provisions of the State Environmental Policy Act. After a consideration of the
response to the issues raised by the Cape Fear River Watch in their letter of October 31, 2003, Inc, this
office concludes that you office has satisfied the review requirements of the Act. Therefore, no further
environmental review action on your part is required for compliance with the Act.
Best regards.
Sincerely,
Ms. Chrys Baggett
Environmental Policy Act Coordinator
Attachments
cc: Region O
Mailing Address: Telephone: [phone] Location Address:
1301 Mail Service Center Fax [phone] West Jones Street
Raleigh, NC 27699-1301 State Courier #51-01-00 Raleigh, North Carolina
e-mail Chrys.BaggettuncmaiLnet
An Equal Opportunity/Affirmative Action Employer

FINDING OF NO SIGNIFICANT IMPACT
ENVIRONMENTAL ASSESSEMENT FOR THE NORTHSIDE WASTEWATER
TREATMENT PLANT UPGRADE AND EXPANSION
October 7, 2003
Project Applicant: City of Wilmington and New Hanover County
Project Number: DWQ # 13195
Responsible Agency: NC Department of Environment and Natural Resources
Division of Water Quality, Water Quality Section (Division)
Pursuant to the requirements of the North Carolina Environmental Policy Act (N.C.G.S. § 113A-
1, et seq.), an environmental assessment (EA) has been prepared for the expansion and upgrade
of the existing Northside Wastewater Treatment Plant (WWTP).
The proposed project would expand the plant's existing permitted capacity of 8.0 million gallons
per day (MGD) to 16.0 MGD. The project also involves renovating the existing plant and
placing an additional 30-inch effluent force main from the WWTP that will run parallel to the
existing force main and terminate at a new outfall location on the Cape Fear River in downtown
Wilmington.
Past and continued growth in population and commercial development within the City and New
Hanover County drive the additional treatment capacity need. Since 1990, the City and County
have experienced a 30 percent growth in population. The City and County prepared a joint
wastewater master plan that resulted in population projections and land forcecasts for existing
and proposed sewer service areas for a 20-year planning period through 2020.
Several alternatives to the proposed project were analyzed for the EA. The "no action"
alternative was not selected because the project proponents felt that it would leave the
jurisdictions unprepared for the expected growth and service area demand over the 20-year
planning period. The selected project was chosen based upon practicality and cost analysis.
The plant, constructed in the late 1960s is located adjacent to 23`d Street and Smith Creek across
from the Wilmington International airport, is owned and operated by the City of Wilmington.
The project will provide treatment for an approximately 128 square mile service area
encompassing the northern portion of the county. Approximately 12.6 square miles are within
the City of Wilmington and 115.4 square miles are in unincorporated New Hanover County.
The service area is mixture of low -density rural, industrial and agriculture in the northern half
and higher density single-family residential and small-business commercial use in the southern
half. Most of the project area is heavily developed and no longer supports a forested habitat.
Some natural forested communities still exist with the service are such as pine savannas,
pine/oak sandhills, and pine flatwoods. According to the National Wetlands Institute mapping

database, approximately 20,000 acres (25 percent of the service area) of freshwater and coastal
wetlands are located within the service area and include areas adjacent to creeks, stream, and
rivers as well as isolated wetlands.
The service area contains three sub -basins of the Cape Fear River Basin: 03-06-17, 03-06-23,
and 03-06-24. The lower Cape Fear River has been placed on the Division's 303(d) list that
identifies impaired streams and prioritizes them for development of total maximum daily loads.
The North Carolina Division of Marine Fisheries classifies both the Cape Fear River and Smith
Creek as primary nursery areas. Water bodies within the service area are classified C, SW, or
SA.
During construction of the proposed project, approximately 1.59 acres of freshwater and coastal
wetlands will be directly impacted. Such impacts will be temporary; as disturbed areas will be
restored back to their original landscape position once construction is complete. Additional
temporary impacts may occur during construction for the installation of the underground force
main, most of which will occur along an old railroad bed and utility right of way, or in other
areas already disturbed. All impacts will be minimized by following required federal and state
permit conditions. An Erosion and Sedimentation Control Plan will be submitted to DENR for
approval before construction commences.
Secondary and cumulative impacts to the environment associated with new land development
could result from the increase in capacity. Various town ordinances and land development
regulations of the City of Wilmington and New Hanover County will mitigate many of the
effects from such development. These include riparian buffer, stormwater management, and open
space protection programs. The land development regulations of both jurisdictions have
established conservation overlay districts (COD) to protect important environmental and cultural
resources within the City and County by requiring specific development controls. If applicable,
the requirements of the COD take precedence over other zoning requirements. Additionally, both
the city and county sponsor several water quality monitoring, environmental restoration, and
community education programs. All new development supported by the project will occur in
accordance with existing ordinances, regulations, and CAMA land use plan policies. Specific
measures are described in detail within the EA.
The Division of Water Quality has concluded that the proposed project will not result in
significant impacts to the environment. This decision is based upon information provided in the
EA and review by governmental agencies. This EA and Finding of No Significant Impact
(FONSI) are prerequisites for the issuance of a NPDES Discharge Permit and 401 Water Quality
Certification by the Division of Water Quality. An environmental impact statement will not be
prepared for this project. This FONSI completes the environmental review record, which is
available for inspection at the State Clearinghouse.
North Carolina Division of Water Quality
October 7, 2003

State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
Michael F. Easley, Governor
William G. Ross, Jr., Secretary
Alan W. Klimek, P.E., Director
NCDENR
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
August 1, 2002
Mr. Roosevelt Childress, Chief
NPDES Permits and Biosolids Section
Water Management Division, EPA Region IV
61 Forsyth Street
Atlanta, Georgia 30303
Subject: Wilmington Northside WWTP Expansion
NPDES No. NC0023965
New Hanover County
Dear Mr. Childress:
The Wilmington - Northside wastewater treatment plant is in the process of planning an
expansion of their municipal plant from 8 MGD to 16 MGD. The plant discharges directly into the
Cape Fear River in New Hanover County. This portion of the Cape Fear River is listed on the 2000
North Carolina 303(d) list of impaired waters due to low dissolved oxygen levels.
The Division of Water Quality and interested stakeholders are in the process of gathering data
to support a model to be used to develop a TMDL. Since the development and approval of the TMDL
may take some time, the Division has provided the City of Wilmington with speculative limits for the
expansion to 16 MGD based on the current basinwide strategy for this portion of the Cape Fear River.
New or expanding municipal discharges greater than 1 MGD must meet tertiary effluent limits of 5
mg/1 BOD5 and 1 mg/1 NI-13-N (summer). Even with an increase in permitted flow, this will represent
an overall decrease in loading to this system as the existing permit has secondary limits.
The City of Wilmington posed the question, that should the final TMDL model demonstrate that
water quality standards would be met with less stringent effluent limits, would the Division of Water
Quality be able to modify the City's permit limits for the expanded flow? It is the Division's
understanding that any such change in limits supported by an approved TMDL would not be
prohibited by the anti -backsliding clause in the Clean Water Act. Specifically, if less stringent limits
were warranted based on new information, then a permit may be modified to reflect the appropriate
limits based on 40 CFR 122.62(a)(2), as well as 40 CFR 122.42(d)(1)(vii)(A) and (B).
1617 MAIL SERVICE CENTER, RALEIGH, NORTH CAROLINA 27699-1 61 7 - TELEPHONE [phone]/FAX [phone]
AN EQUAL OPPORTUNITY AFFIRMATIVE ACTION EMPLOYER - 50% RECYCLED/ 1 0% POST -CONSUMER PAPER
VISIT US ON THE WEB AT http:/ /h2o.enr.state.nc.us/NPDES

Mr. Childress
Page 2 of 2
The City of Wilmington has requested a written response to this inquiry from EPA Region IV
(the City received written response from the Division, but now requests written confirmation from your
office as well). Please contact me at (919) 733 - 5083, ext. 517 or Susan Wilson at ext. 510, should
you have further questions regarding this request.
cc: Central Files
Wilmington Regional Office, Water
Hugh Caldwell, P.E.
Director of Public Works
Wyatt Blanchard
County Engineer
NPDES file
David A. Goodric Supervisor
NPDES Unit
Quality Section
City of Wilmington
P.O. Box 1810
Wilmington, NC 28402
New Hanover County
414 Chestnut Street
Wilmington, NC 28401

WI uA - 1\62;734siDt-.
Ncoo 43%0c
CITY OF WILMINGTON
PUBLIC UTILITIES DEPARTMENT
August 1, 2002
David Goodrich
NCDENR/DWQ/NPDES Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
Re: Meeting of July 24, 2002
Northside WWTP Expansion
Dear Mr. Goodrich:
Thank you for taking the time to meet with Wyatt Blanchard and me last week.
P.O. Box 1810
WILMINGTON, NC 28402
TDD [phone]
We appreciate your suggestions regarding expediting the environmental review and permitting
process by early contact with key stakeholders. We look forward to receiving an update on the status of
the review of our water quality model and the TMDL development process. We also look forward to
receiving the letter from EPA clarifying the anti -backsliding rule as it might apply to our project.
We were disappointed to learn that DWQ will not consider issuing interim limits or mass based
limits pending the outcome of the TMDL process. We still feel this is a viable way to manage waste load
allocations until the TMDL is developed and allocations can be made based upon sound scientific
information. Interim limits would also help to avoid any anti -backsliding issues.
We appreciate your continued commitment to making our project a priority for the NPDES Unit.
The following scheduled was discussed:
August 15, 2002
December 15, 2002
February 15, 2003
April 15, 2003
May 15, 2003
City submit EA
FONSI issued
Construction Plans may be submitted
Discharge Permit issued
Authorization to construct issued
This was recognized as an aggressive but do -able schedule and assumes no public hearing would
be required for the discharge permit.
Thank you again for your time. As we discussed, we will stay in close communication as our
project proceeds through the permitting process.
Yours very truly,
Hugh T. Caldwell, P.E.
Director of Public Utilities
cc: Wyatt Blanchard, P. E., New Hanover County
Ken Vogt, City of Wilmington
Alex Monroe, P. E., McKim & Creed
Ron Taylor, P. E., Hazen & Sawyer
Trevor Clements, Tetra Tech
Kim Williams, Land Management Group
Hunvnoa3i nn HNiG
ZOOZ l - Jt
BIRUIDBI
ADMINISTRATION
VOICE [phone]
FAX [phone]
ENVIRONMENTAL SERVICES
VOICE [phone]
FAx [phone]
UTILITY SERVICES
VOICE [phone]
FAx [phone]
WASTEWATER TREATMENT
LOUGHLIN PLANT MAFFITT PLANT
VOICE [phone] VOICE [phone]
FAx [phone]
WATER TREATMENT
VOICE [phone]
FAX [phone]

CITY OF WILMINGTON
PUBLIC UTILITIES DEPARTMENT
June 7, 2002
David Goodrich
NCDEHNR/DWQ/NPDES Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
Re: Response to Division letter of 5/17/02
Dear Mr. Goodrich:
P.O. Box 1810
WILMINGTON, NC 28402
TDD [phone]
t; (:RO N
BRANCN
Thank you for your letter of May 17 responding to our offer and concerns outlined in a
letter to you dated March 19. As stated previously, the City and New Hanover County are
proceeding with a plant design capable of meeting limits of 5 mg/1 BOD and 1 mg/1 of ammonia.
We feel this is a prudent course of action as a contingency against future possible limits
reductions as we approach ultimate projected flow rates. However, we remain concemed about
preserving the mass waste load allocation associated with existing NPDES permit conditions.
As you know, the City and County have made a substantial investment in gathering
information on the Cape Fear estuary and developing a scientifically -sound hydrodynamic water
quality model. The dye studies and modeling analyses conducted by Tetra Tech demonstrate
that the strong mixing of the estuary provides a minimum near field dilution of 241:1 and
minimum far field (Navassa) dilution of 300:1 for the Northside Plant effluent. The modeling
studies also indicate that the impact on dissolved oxygen during summer critical conditions from
the combined Northside and Southside effluents at permitted mass loads averaged < 0.1 mg/1.
Unlike the vast majority of situations where DWQ has applied 5/1 limits, the Cape Fear Estuary
is not an effluent dominated water body. In fact, the City invested considerable funds in building
a pipeline to move the Northside effluent outfall from the previously effluent dominated Smith
Creek to the Cape Fear River to take advantage of the dilution and mixing provided by the
estuary.
Your letter indicated that relaxation of the 5/1 limits would not be prohibited by the anti -
backsliding clause in the Clean Water Act, should new information demonstrate that less
stringent limits protect water quality. While we appreciate your mentioning this, we are not
aware of a single case in which BOD and ammonia limits have been relaxed once limits have
been imposed in a permit. Ironically, the City/County have already provided sufficient new
information to support limits less stringent than 5/1. Although a TMDL has not been completed
(or alternatively, a delisting decision made), sufficient information has been supplied to DWQ to
justify maintaining the existing mass load allocation for Wilmington and New Hanover County.
I
ADMINISTRATION ENVIRONMENTAL SERVICES UTILITY SERVICES WASTEWATER TREATMENT WATER TREATMENT
VoicE [phone] VOICE [phone] VoicE [phone] LOUGHLIN PLANT MAFFI T PLANT VOICE [phone]
FAx [phone] FAx [phone] FAX [phone] VoicE [phone] VoicE [phone] FAx [phone]
FAx [phone]

David Goodrich
June 7, 2002
Page Two
You state in your letter that the Division cannot place mass limits in the expansion
permit. We respectfully request that you reconsider this option. We are not aware of any
restriction that would prevent DWQ from reviewing the plant design and construction for its
ability to achieve 5/1 treatment levels, while instituting mass -based limits in the permit. Further,
the permit could include concentration limits reflecting staged flow limits based on phased
capacity such that while the mass allocation remains unchanged, reduced concentrations must be
achieved for compliance on a regulatory basis. At a minimum, the mass allocation could be
documented in a special condition within the permit. We wish to explore this option further with
you in the coming months.
Based on the feedback from the Division and reviewer comments received through the
Scoping process, we will proceed with refinement and submittal of the Environmental
Assessment for the proposed plant expansion. We appreciate your commitment to making every
effort to expedite issuance of the permits, and we understand that you cannot control public
comment. It is our hope that the public will recognize the extraordinary action that the City and
County are pursuing in the design and construction of a tertiary treatment facility.
We remain committed to moving forward on this project that will further enhance
environmental protection while serving the economic and social needs of the community. We
look forward to continuing to work with the Division closely in the months to come to address
concerns in a mutually satisfactory manner.
Very truly yours,
Hugh T. Caldwell, P.E.
Director of Public Utilities
cc: Coleen Sullins, NCDENR/DWQ
Wyatt Blanchard, New Hanover County Engineer
Ken Vogt, Superintendent of Wastewater Treatment
Trevor Clements, Tetra Tech
Ron Taylor, Hazen and Sawyer
Alex Monroe, McKim and Creed

State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
Michael F. Easley, Governor
William G. Ross, Jr., Secretary
Gregory J. Thorpe, Ph.D., Acting Director
May 17, 2002
Mr. Hugh Caldwell, P.E.
Director of Public Utilities
City of Wilmington
P.O. Box 1810
Wilmington, North Carolina 28402
it7rA
NCDENR
NORTH CAROLJNA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
Subject: Wilmington Northside WWTP Expansion
NPDES No. NC0023965
New Hanover County
Dear Mr. Caldwell:
This letter is offered in response to your letter dated March 19 regarding the meeting held
between Wilmington and the Division of Water Quality staff to discuss the expansion of the
Wilmington - Northside wastewater treatment plant. The Division is pleased that the City plans
to move forward with a plant design to meet tertiary treatment limits of 5 mg/1 BOD and 1 mg/1
ammonia.
A concern that the City has in accepting a permit with tertiary limits is the possibility that
the development of a TMDL may reflect the need for less stringent effluent limits. In conversation
with staff at EPA Region IV, specifically Mr. Marshall Hyatt, if less stringent limits are warranted
based on new information, then a permit may be modified to reflect the appropriate limits [ref. 40
CFR 122.62(a)(2), as well as 40 CFR 122.42(d)(1)(vii)(A) and (B)]. Any such change in limits
supported by an approved TMDL will not be prohibited by the anti -backsliding clause in the Clean
Water Act.
The City also expressed the concern that the current mass waste load allocation will not be
preserved if the City accepts the new limits. Traditionally, the development of the TMDL and
allocation of mass pollutant loading is based on conditions existing at the time of study. Since the
sampling and model development are currently taking place, this allocation would likely be based
on existing conditions, taking into consideration permitted flow and planned expansions. The
City's current record of mass load will be preserved in the Division's files. However, the Division
cannot place those mass loads, which would be inconsistent with the more stringent limits, within
the expansion permit.
The proposed expansion of the Northside plant from 8 MGD to 16 MGD will require an
Environmental Assessment. As discussed during the meeting, it is the City's prerogative to choose
to move forward with an Environmental Impact Statement (EIS) in lieu of an Environmental
Assessment (EA). As indicated in the meeting, an EIS can, if documented well and clearly, move
forward as quickly as an EA. However, please be aware that the Division of Water Quality cannot
guarantee that an EA will not result in the development of an EIS. You may wish to discuss this
further with Milt Rhodes, Community Planner with the Local Government Assistance Unit, at
[phone], ext. 366, after you receive comments on the scoping document.
1617 MAIL SERVICE CENTER, RALEIGH, NORTH CAROLINA 27699-1617 - TELEPHONE [phone]/FAX [phone]
AN EQUAL OPPORTUNITY AFFIRMATIVE ACTION EMPLOYER - 50% RECYCLED/ 1 0% POST -CONSUMER PAPER
VISIT US ON THE WEB AT http://h20.enr.state.nc.us/NPDES

Mr. Hugh Caldwell, P.E.
Page 2
The Division will make every effort to expedite Wilmington's permits for expansion (NPDES
permit and authorization to construct), once the EA or EIS process is completed. However, as the
City is aware, the NPDES process is a public process and the Division cannot predict if this project
will generate significant public comments, which could delay issuance of any permits.
The Division appreciates the City of Wilmington's willingness to share the current model
for the Lower Cape Fear River with the Division and other interested stakeholders. Please contact
Susan Wilson at (919) 733 - 5083, ext. 510 if you need additional information or clarification.
Sincerely,
David A. Goodrich, Supervisor
NPDES Unit
cc: Central Files
Wilmington Regional Office, Water Quality Section
NPDES file
Michelle Woolfolk

To: Todd Kennedy
Local Government Assistance Unit
From:
Subject: t:
DIVISION OF WATER QUALITY
May 16, 2002
Susan A. Wilson, Environmen
tal Engineer
NPDES Unit
Wilmington Northside WWTP
Expansion Scoping Document
NPDES No. NC0023965
New Hanover County
D304, ,7
I have reviewed the scoping plan submitted by the City of Wilmington. The proposed project is
the expansion of the Northside plant from 8 MGD to 16 MGD to meet future growth needs and
upgrade the treatment plant. The NPDES Unit has already provided the City speculative limits
and concerns regarding the expansion, via letter dated February 27, 2002. As outlined in the
speculative limits letter, the City of Wilmington should plan to meet limits of 5 mg/1 BODS and
1 mg/1 ammonia (monthly average, summer) with the proposed expansion to 16 MGD and this
should be stated under the Water Quality concerns in the document.
In addition to the comments provided in the speculative limits letter, the NPDES Unit also
offers the following comments on the Environmental Assessment scoping document, as well as
the timeline which was provided to the NPDES Unit through a separate submittal:
• The City should contact the Wilmington Regional Office regarding the proposal for two
effluent lines and diffusers. The NPDES Unit is unsure from this document if single -
sampling can be conducted for compliance purposes prior to the dual lines. The Division
has discouraged dual lines if dual -type sampling has to be conducted to ensure compliance
with effluent limits.
• If not already completed, the City should provide the Division with the results of the
CORMIX model for the diffusers upon application for expansion, if not sooner. This will
allow the Division the ability to determine the appropriate dilution ratio necessary for the
calculation of the toxicity testing requirement and any water quality based toxicant limits.
• In regard to the timeline of permits, the City should be aware that although the NPDES
Unit will make every effort to expedite its required permits, traditionally, an NPDES permit
takes approximately 4 to 6 months to issue. The NPDES application for expansion cannot
be submitted until a recommendation for a Finding Of No Significant Impact (FONSI) has
been submitted to the State Clearing House (resulting from the Environmental Assessment
process). Additionally, plans and specifications for an Authorization to Construct (ATC)
permit cannot be submitted until a draft permit has been submitted for public notice. The
City may only enter into a contract for the expansion project after the ATC has been issued
(the NPDES permit and the ATC permit can sometimes be issued simultaneously).
• Any permit application for expansion must also include an Engineering Alternative Analysis
(EAA). Please refer to the NPDES Unit website for an explanation of the requirements for
the EAA.
http: / /h2o. enr. state. nc. us/ NPDES/ NPDESweb. html

An approximation of the timelines, with regard to water quality permits issuance:
Month
1
2
3
4
5
6
7
Action(s)
FONSI
NPDES
Application
Public Notice/
Draft Permit
NPDES
Issuance
Plans & specs for ATC
ATC Issuance
Contract for
construction
Cc: WiRO/WQ/Ed Beck
NPDES Unit
Modeling/TMDL Unit, Michelle Woolfolk
Central Files

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NC DENR - DIVISON OF WATER QUALITY 2B .0300
.0311
CAPE FEAR RIVER BASIN
Name of Stream
Description
Class
Classification
Date Index No.
Natmore Creek
Rollins Branch
Bear Swamp
Field Creek
Bulldog Cut
Catfish Creek
Indian Creek
Clabber Branch
Cherry Tree Prong
Mulberry Branch
Otter Branch
Mill Branch
CAPE FEAR RIVER
Cartwheel Branch
Toomers Creek
Toomers Creek
Northeast Cape Fear
River
Barlow Branch
Lewis Branch (Williams
Millpond)
Horse Pen Branch
Rattlesnake Branch
From Hydrologic Unit line
to White Oak Canal (HU
located 0.5 mile upstream
of of mouth)
From source to Buckle Swam
Creek
From source to Rollins
Branch
From Black River to Lyon
Thorofare
From Cape Fear River to
Black River
From source to Cape Fear
River
From source to Cape Fear
River
From
From
From
From
source
source
source
source
Branch
to Indian Cree
to Indian Cree
to Indian Cree
to Mulberry
From soruce to Indian Cree
From upstream mouth of
Toomers creek to a line
across the river from Snow
Point (through Snows Marsh
to Federal Point
From source to Cape Fear
River
From upstream mouth to a
point 0.8 mile upstream of
mouth
From a point 0.8 mile
upstream of mouth to mouth
(City of Wilmington water
supply intake)
From source to Muddy Creek
From source to Northeast
Cape Fear River
From source to Northeast
Cape Fear River
From source to Lewis Branc
From source to Northeast
Cape Fear River
53
C Sw
C Sw
C Sw
C Sw
C Sw
C Sw
C Sw
C Sw
C Sw
C Sw
C Sw
C Sw
SC
SC Sw
WS-IV
WS-IV CA
C Sw
C Sw
C Sw
C Sw
C Sw
09/01/74 18-68-22-1-2-2-1
09/01/74 18-68-22-1-2-3
09/01/74 18-68-22-1-2-3-1
04/01/59 18-68-22-2
04/01/59 18-68-23
09/01/74 18-69
04/01/59 18-70
04/01/59 18-70-1
04/01/59 18-70-2
04/01/59 18-70-3
04/01/59 18-70-3-1
04/01/59 18-70-4
08/09/81 18-(71)
04/01/59 18-72
08/03/92 18-73-(1)
08/03/92 18-73-(2)
09/01/74 18-74-(1)
09/01/74 18-74-2
09/01/74 18-74-3
09/01/74 18-74-3-1
09/01/74 18-74-4

CAPE FEAR RIVER BASIN
Name of Stream
Subbasin Stream Index Number Map Number Class
Bulldog Cut CPF20 18-68-23 J26SE2 C Sw
Bullhead Branch CPF20 18-68-18-1 I26NW9 C Sw
Bulltail Creek CPF20 18-68-18-2 I26NW9 C Sw
Bulltail Creek CPF22 18-74-29-3-1 H26SW7 C Sw
Burdens Creek CPF05 16-41-1-17-1-(0.3) D23NW9 C NSW
Burdens Creek CPF05 16-41-1-17-1-(0.7) D23NW9 WS-IV NSW
Burgaw Creek CPF23 18-74-39 I27SW6 C Sw
Burn Coat Creek (Maxwell Millpond) CPF22 18-74-17 G27SE5 C SW
Burnt Mill Creek CPF23 18-74-63-2 K27NW2 C Sw
Burris Creek CPF17 18-88-8-2-3 L27NW7 SA HQW
Bush Creek CPF05 16-41-4-(0.3) D22SE5 WS-IV NSW
Bush Creek CPF05 16-41-4-(0.7) D22SE5 WS-IV NSW CA
Bush Creek CPF09 17-15 D2OSW7 C
Bush Creek CPF07 18-6 E22SE9 C
Butler Branch CPF14 18-23-16-8-3 F22SW4 WS-III
Butler Creek CPF24 18-87-18 J28SW4 SA ORW
Buttermilk Creek CPF02 16-14-5 C2ONE3 WS-II HQW NSW
Buxton Branch CPF20 18-68-18-9 I26SE4 C Sw
Buzzard Bay CPF17 18-88-8-2 L27NW7 SA HQW
Buzzard Branch CPF15 18-28-3 G23SE7 C
CAPE FEAR RIVER CPF07 18-(1) E22SE2 WS-IV
CAPE FEAR RIVER CPF11 18-(1) E22SE2 WS-IV
CAPE FEAR RIVER CPF07 18-(4.5) E22SE6 WS-IV CA
CAPE FEAR RIVER CPF07 18-(5.5) E22SE6 WS-V
CAPE FEAR RIVER CPF07 18-(10.5) E23SW8 WS-IV
CAPE FEAR RIVER CPF07 18-(16.3) F23NE8 WS-IV CA
CAPE FEAR RIVER CPF07 18-(16.7) F23NE8 WS-IV
CAPE FEAR RIVER CPF13 18-(16.7) F23NE8 WS-IV
CAPE FEAR RIVER CPF07 18-(20.3) F24SW5 WS-IV CA
CAPE FEAR RIVER CPF13 18-(20.3) F24SW5 WS-IV CA
CAPE FEAR RIVER CPF14 18-(20.3) F24SW5 WS-IV CA
CAPE FEAR RIVER CPF07 18-(20.7) F24SW5 WS-V
CAPE FEAR RIVER CPF14 18-(20.7) F24SW5 WS-V
CAPE FEAR RIVER CPF15 18-(20.7) F24SW5 WS-V
CAPE FEAR RIVER CPF15 18-(23.5) G24NW4 WS-IV
CAPE FEAR RIVER CPF15 18-(25.5) G23SE1 WS-IV CA
CAPE FEAR RIVER CPF15 18-(26) G23SE4 C
CAPE FEAR RIVER CPF16 18-(26) G23SE4 C
CAPE FEAR RIVER CPF16 18-(49) I25SW4 WS-V
CAPE FEAR RIVER CPF16 18-(53.5) I25SW8 WS-IV
CAPE FEAR RIVER CPF16 18-(58.5) J25NE8 WS-IV CA
CAPE FEAR RIVER CPF16 18-(59) J25NE8 WS-IV Sw
CAPE FEAR RIVER CPF16 18-(62.5) J26SW1 WS-IV Sw CA
CAPE FEAR RIVER CPF17 18-(62.5) J26SW1 WS-IV Sw CA
CAPE FEAR RIVER CPF17 18-(63) J26SW1 C Sw
CAPE FEAR RIVER CPF20 18-(63) J26SW1 C Sw
CAPE FEAR RIVER CPF17 18-(71) J27SW7 SC
CAPE FEAR RIVER (excluding area described CPF17 18-(87.5) L27NW1 SA HQW
below)
Cabin Branch
Cabin Branch
Cabin Branch
Cabin Creek
Cabin Creek
CPF15 18-31-8 G21SE5 C
CPF21 18-74-8-3 G27NW6 C Sw
CPF22 18-74-24-1-1-1 H26SE3 C Sw
CPF10 17-26-5-(1) F20SW1 WS-III
CPF10 17-26-5-(7) F2ONE4 WS-III CA
Pag 5 of 30

• NC DENR - DIVISON OF WATER QUALITY 2B .0300
.0311 CAPE FEAR RIVER BASIN
Name of Stream
Description
Class
Classification
Date Index No.
Mill Creek
Kellys Creek
Guffords Branch
Juniper Branch
Mill Creek
Collins Branch
Morgans Creek
Cowpen Branch
Tonys Creek
Lagoon Creek
Fishing Creek
Dock Creek
Northeast Cape Fear
River
Ness Creek
Smith Creek
Spring Branch
Burnt Mill Creek
Mineral Springs
Branch
Alligator Creek
Greenfield Creek
Greenfield Lake
Silver Stream
Branch
Clay Bottom Branch
Jumping Run Branch
Squash Branch
Brunswick River
Sturgeon Creek
From source to Rileys Cree
From source to Rileys Cree
From source to Rileys Cree
From source to Long Creek
From source to Long Creek
From source to Mill Creek
From source to Long Creek
From source to Northeast
Cape Fear River
From source to Northeast
Cape Fear River
From source to Northeast
Cape Fear River
From source to Northeast
Cape Fear River
From source to Northeast
Cape Fear River
From mouth of Ness Creek t
Cape Fear River
From source to Northeast
Cape Fear River
From source to Northeast
Cape Fear River
From source
From source
From source
Creek
to
to
to
Smith
Smith
Burnt
Creek
Creek
Mill
From source to Cape Fear
River
From Greenfield Lake to
Cape Fear River
Entire Lake
From source to Greenfield
Lake, Greenfield Creek
From source to Greenfield
Lake, Greenfield Creek
From source to Greenfield
Lake, Greenfield Creek
From source to Greenfield
Lake, Greenfield Creek
From source to Cape Fear
River
From source to Burnswick
River
61
C Sw
C Sw
C Sw
C Sw
C Sw
C Sw
C Sw
C Sw
C Sw
C Sw
C Sw
C Sw
SC Sw
C Sw
C Sw
C Sw
C Sw
C Sw
SC Sw
SC Sw
C Sw
C Sw
C Sw
C Sw
C Sw
SC
C Sw
09/01/74
09/01/74
07/01/73
04/01/59
04/01/59
04/01/59
09/01/74
04/01/59
18-74-55-9-2
18-74-55-9-3
18-74-55-9-4
18-74-55-10
18-74-55-11
18-74-55-11-1
18-74-55-12
18-74-56
04/01/59 18-74-57
04/01/59 18-74-58
09/01/74 18-74-59
09/01/74 18-74-60
04/01/59 18-74-(61)
09/01/74 18-74-62
09/01/74 18-74-63
09/01/74 18-74-63-1
03/01/77 18-74-63-2
08/01/85 18-74-63-2-1
04/01/59 18-75
04/01/59 18-76
04/01/59 18-76-1
04/01/59 18-76-1-1
04/01/59 18-76-1-2
04/01/59 18-76-1-3
04/01/59 18-76-1-4
08/09/81 18-77
04/01/59 18-77-1

Whole Effluent Toxicity Testing Self -Monitoring Summary April 23, 2002 ,
FACILITY REQUIREMENT YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Whiteville WWTP-001 Perm chr lim: 50%
NC0021920/001 Begin:5/I/2000 Frequency: Q Jan Apr Jul Oct
County: Columbus Region: WIRO Subbasin LUM58
PF: 3.0 Special
7Q10: 4.7 IWC(%)50 Order:
+ NonComp:Single
1998 Pass - Pass - Pass - Pass
1999 Pass Pass - Pass - - Pass - -
2000 Pass - - Pass •- - Fall <12.5 <12.5 <12.5 <12.5 17.68
2001 <25 <25 <25 35.4 82.16 >100 >100 >100 >100 >100 >100 >100
2002 35.4 94.9
Wildwood Green Perm chr lim: 72% 1998 - Pass - Pass - - Pass - -- Pass
NC0063614/001 Begin:6/1/2000 Frequency: Q Feb May Aug Nov + NonComp:Single 1999 -- Pass - -- Pass Pass -- Fall
County. Wake Region: RRO Subbasin: NEU01 2000 Pass Pass --- -- Pass - Pass Pass
PF: 0.1 Special 2001 - Pass -- Pass - -- Pass -• Pass
7Q10: 0.06 1WC(%):72 ()Mix: 2002 - Pass
Fail
Wilkesboro W WTP Penn chr lim: 3.7%
NC0021717/001 Begin:5/I/1999 Frequency: Q P/F + Mar Jun Sep Dec
County: Wilkes Region: WSRO Subbasin: YADOI
PF: 4.9 Special
7Q 10: 196 IWC(%):3.72 Ord,,:
+ NonComp:Singlc
1998 - Pass --- -- Pass --- --- Pass --- --- Pass
1999 - - Pass --- Pass --- --- Pass --- --- Pass
2000 - Pass --- -- Pass --- --- Pass --- --- Pass
2001 - - Pass -- .-- Pass --- -- --- -- Pass
2002 - Pass
William Energy Ventures -Selma Perm: 24hr LC50 ac mono cpis Rhd (grab) 1998 - - -- >100
NC0052311/001 Begin:9/1/1999 Frequency: A NonComp: 1999 - - -- - -- >100sg
County. Johnston Region: RRO Subbasin: NEU02 2000 - - >100 ---
PF: -- Spacial 2001 - >100 -- -- ---
7Q10; 0.0 IWC(%):100.0 Order: 2002 - --
Williams Energy Ventures Perm 24hr LC50 ac monit epis fthd (grab) 1998 - - - --
NC0005185/006 Begin9/1/2001 Frequency; A NonComp: 1999 - - - >100
County Mecklenburg Region: MRO Subbasin: CTB34 2000 - - - >100
PF: NA Special 2001 - - Pass -
7Q10: 0.0 IWC(%):100 ()der: 2002 -- -
>100
Williams Energy Ventures -Greensboro Perm 24hr LC50 ac monit epis fthd (grab) 1998 - - -
NC0074578/002 Begin:6/1/1996 Frequency: A NonComp: 1999 - - >100
County Guilford Region: WSRO Subbasin: CPF08 2000 >100 - -
PF: 0.0067 Special 2001 >1pp
7Q10: 0.0 IWC(%):100 Oder: 2002 -
>100
Williams Terminals Holdings, L.P. Perm 24hr LC50 ac menu epis fthd (grab) 1998 - - - - (Ask!
NC0074705/001 Begin:9/1/2001 Frequency: A NonComp: 1999 -- - - >10051g
County: Mecklenburg Region: MRO Subbasin CTB34 2000 -- - >100 -
PF: 0 Special 2001 -- - - - >100
7Q10: 0 IWC(%):100 Order: 2002 --
>100
Williams Terminals Holdings-G'boro Perm 24hr LC50 ac monit epis fthd (Grab) 1998 >100 -
NC0003671/001 Begin: 1/1/2002 Frequency: A NonComp: 1999 -• 53.76
County: Guilford Region: WSRO Subbasin: CPF02 2000 >100 -
PF: NA Special 2001 - -
7Q10:0.0 IWC(%):100 Order: 2002 - >100
Williamston WWTP Perm chr lim: 0.26%; if pf 2.4 chr lim 0.32% 1998 - - Pass - Pass -- Pass - Pass
NC0020044/001 Begin:2/1/I998 Frequency: Q + Mar Jun Sep Dec + NonComp:Single 1999 -• - Pass --- Pass Late Pass -- Pass
County: Martin Region: WARO Subbasin: ROA09 2000 -- - Pass -•- -- Pass - -- Pass - --- Pass
PF: 2.0 Special 2001 - - Pass --- - Pass -- Pass Pass
7Q10: 1170 IWC(%):0.26 Order: 2002 - - Pass
Wilmington Nortbside WWTP Perm 24hr p/f ac lim: 90% D. pulex 9 1998 -- Pass - - Pass - -- Pass,Fail - - Pass
NC0023965/001 Bcgin:8/I /1996 Frequency: Q + Feb May Aug Nov NonComp:Single 1999 -- Pass - Pass -- Pass - - FoiI,Pass
County: New Hanover Region: WIRO Subbasin: CPFI7 2000 -- NR/Pass - Pass - Pass Pass,Fail
PF: 8.0 Special 2001 -- Pass - Pass Passsi9 - - Pass
7Q10: Tidal IWC(%):NA ()der: 2002 -- Pass
Wilmington Soutbside WWTP Perm 24hr p/f ac lim: 90%D. pulex Y 1998 - - Pass - Pass
NC0023973/00I Begin:9/1/1996 Frequency: Q + Mar Jun Sep Dec NonComp:Single 1999 - - Pass - Fail
County: New Hanover Region: WIRO Subbasin: CPFI7 2000 - - Pass - -- Pass
PF: 12.0 Special 2001 -- -- Pass --- -- Pass
7Q10: 1149 IWC(%):1.59 Order: 2002 --
Pass
Pass -- - Pass
- Pass - - Pass
- Pass -- Pass
Pass Pass
9 Pre 1998 Data Available
LEGEND:
PERM = Permit Requirement LET = Administrative Letter - Target Frequency = Monitoring frequency: Q- Quarterly; M- Monthly; BM- Bimonthly; SA- Semiannually; A- Annually; OWD- Only when discharging; D- Discontinued monitoring requirement
Begin = First month required 7Q10 = Receiving stream low Row criterion (cfs) + = quarterly monitoring increases to monthly upon failure or NR Months that testing must occur - ex. Jan, Apr, Jul. Oct NonComp = Current Compliance Requirement
PF = Permitted flow (MGD) 1 WC% = Instream waste concentration P/F = Pass/Fail test AC = Acute CHR = Chronic
Data Notation: f - Fathead Minnow; • - Ceriodaphnia sp.; my - Mysid shrimp; ChV - Chronic value; P - Mortality of stated percentage at highest concentration; at - Performed by DWQ Aquatic Tox Unit-, bt - Bad test
Reporting Notation: -- = Data not required; NR - Not reported Facility Activity Status: 1 - Inactive, N - Newly Issued(To construct); H - Active but not discharging; t-More data available for month in question; • = ORC signature needed
49

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•
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Dissolved Oxygen (parts per million)
12-
10-
8
6
4
2
0
Figure 22 Mean monthly dissolved oxygen concentration for the Lower
Cape Fear River Program channel stations, June 1995-M ay 2000.
Hurricane Hurricane Hurricane
Fran Bonnie Floyd
NC State
Standard
x 0 H m cc 0 H m e F- m 2 H rn x t5 F m cc
> > 0 id ui d > > p c++ d > > t� a > > 0 id u, o. > > C� gu O.
4 0 0 U. -a d p O d -� d O o d-3 d p O q CC 0 o d
1995 1996 1997 1998 1999 2000
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Total Phosphorus ( ligA)
200
180 -
160 -
140 -
120 -
100 -
80 -
60 -
40 -
20 -
0
Figure 2.19 Mean total phosphorus concentrations at the Lower Cape
Fear River Program channel stations.
V
Z
V
Q-
< i
z
COIn " M N a-
■June 1999-May2000 OJune 1995-May2000
ti
I
z
CO
V
z
CD
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Fecal Coliform Bacteria (cfull 00 rr
Figure 2.26 Geometric mean fecal coliform bacteria concentrations at the
Lower Cape Fear River Program channel stations.
60 -
50 -
40 -
30 -
20 -
10-
0
1' 1
U Q- U > CD IX
U `< 0 < = co
Z
— ▪ C-4 40 Cr) CO
• cn
■June 1999-May 2000 DJune 1996-May 2000
r—
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Dissoved Oxygen (parts per million
Figure 2.4 Monthly dissolved oxygen concentrations at three stations representing
the three main rivers in the Lower Cape Fear River system, including the Cape
Fear (NCI 1), Northeast Cape Fear (NCF117), and Black Rivers (B210),
June 1995-May 2000.
16-
14-
12-
10-
8-
6-
2
0
NC State
Standard
Hurricane
Fran
—0-- NC11
- NCF117
•• *It ••E210
Hurricane
Bonnie
Hurricane
Floyd
Z 0 H cJ m cc z C7 H ca m ac z to F— c3 m cc Z r- U m nc Z U m ix
R O O t,- 2sR O O O O O O c(
1995 1996 1997 1998 1999 2060
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Dissolved Oxygen (parts per million)
Figure 2.3 Mean dissolved oxygen concentrations at the Lower Cape Fear
River Program channel stations for summer (June -September) and
winter (December-M arch), June 1995-May 2000.
1
i
• d 0 V < =
z
m CO 2 2 X 2 0.1
E
1
N
m
i
m
m
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; andard--_
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a)
2
0
H
2000
1800
1600
1400
1200
1000
800
600
400
200
0
Figure 2.15 Mean monthly total nitrogen concentrations of the Lower
Cape Fear River Program channel stations, June 1995 - May 2000.
z
i w W ? v W W? wW cc Z 0 vw CO dW
o Wo o o o o
-
1995 1996 1997 1998 1999 2000
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DMR VIOLATIONS for:
Permit:
Facility Name %
DMRs Between 1-2001 and 12- 2001 Region: co
Param Name % County %
Violation Category nc0023965
Subbasin %
Page: 1 of 1
Report Date: 07/01/02
PERMIT: FACILITY: COUNTY: REGION:
DMR OUTFALL LOCATION PARAMETER
VIOLATION
DATE
00-0 12/31/69
FREQUENCY
UNIT OF CALCULATED
MEASURE LIMIT VALUE
VIOLATION TYPE

DMR VIOLATIONS for:
Permit: nc0023965
Facility Name %
DMRs Between 1- 1998 and 12- 2000 Region: Violation Category
Param Name County Subbasin
Page: 1 of 1
Report Date: 07/01/02
PERMIT: NC0023965 FACILITY: City of Wilmington - Northside WWTP
COUNTY: New Hanover REGION: Wilmington
Limit Violation
VIOLATION UNIT OF CALCULATED
DMR OUTFALL LOCATION PARAMETER DATE FREQUENCY MEASURE LIMIT VALUE VIOLATION TYPE
01-1999 001 Elllucnt BOD, 5-DAY (20 DEG. C) 01/30/99 Daily -- weekdays mg/1 45 45.43 Weekly Average Exceeded
01-1999 001 Effluent COLIFORM, FECAL MF, M-FC 01/30/99 Daily -- weekdays #/100m1 400 Weekly Geometric Mean
BROTH,44.5C Exceeded
01-1999 001 Ef fluent COLIFORM, FECAL MF, M-FC 01/31/99 Daily -- weekdays #/100m1 200 Monthly Geometric Mean
BROTH,44.5C Exceeded
09-1999 001 Effluent COLIFORM, FECAL MF, M-FC 09/18/99 Daily -- weekdays #/100m1 400 2,304.38 Weekly Geometric Mean
BROTH,44.5C Exceeded
09-1999 001 Effluent COLIFORM, FECAL MF, M-FC 09/25/99 Daily -- weekdays #/100m1 400 2,217.83 Weekly Geometric Mean
BROTH,44.5C Exceeded
09-1999 001 Effluent COLIFORM, FECAL MF, M-FC 09/30/99 Daily — weekdays #/100m1 200 436.73 Monthly Geometric Mean
BROTH,44.5C Exceeded
09-2000 001 Effluent COLIFORM, FECAL MF, M-FC 09/30/00 Daily -- weekdays #/I00m1 400 483.13 Weekly Geometric Mean
BROTH,44.5C Exceeded
09-1999 001 Diluent FLOW, IN CONDUIT OR THRU 09/30/99 Continuous mgd 8 8.84 Monthly Average Exceeded
TREATMENT PLANT

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Whole Effluent Toxicity Testing Self -Monitoring Summary
FACILITY REQUIREMENT
July 16, 2C
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Williansslon wwrp Perm chr lim: 0/6%; if pf 2.4 chr lint 032% 1998 — — Pass — — Pass — Pass -- — Pass
NC0020044/001 Begin:2/1/1998 Frequency: Q + Mu Jun Sep Dec + NonComp:Single 1999 — — Pass — — Pass — Late Pass — Pass
County. Manin Region: WARO Subbasin: ROA09 2000 — — Pass — — Pass -- — Pass — — Pass
PF: 2.0 Special 2001 — — Pass — — Pass — — Pass — — Pass
7Q10: 1170 IWC(%)0.26 Order: 2002 — — Pass -- —
Wilmington Northside WWTP Penn 24hr p/fac lim: 90% D. pules Y 1998 — Pass Pass — — Pass,Fall — — Pass
NC0023965/00I Begin:8/1/1996 Frequency: Q + Feb May Aug Nov NonComp:Single 1999 — Pass — — Pass — — Pass — Fail,Pass
County. New Hanover Region: WIRO Subbasin: CPFI7 2000 — NR/Pass --- — Pass — — Pass — — Pass,Fail
PF: 8.0 Special 2001 — Pass — — Pass — — Passsig — -- Pass
7Q10: Tidal IWC(%):NA Order: 2002 — Pass Pass
1Viln ington Soulhside WWTP Perm 24hr p/f ac lim: 90% D. pules Y 1998 — — Pass — — Pass -- -- Pass — — Pass
NC0023973/001 Begin9/I/I996 Frequency: Q + Mar Jun Sep Dec NonComp:Single 1999 — — Pass -- — Fail Pass -- Pass -- — Pass
County. New Hanover Region: WIRO Subbasin: CPFI7 2000 — — Pass — — Pass — -- Pass --- Pass
PF: (2.0 Special 2001 — — Pass — — Pass Pass -- -- Puss
7Q10: 1149 IWC(%):1.59 Order: 2002 — — Pass -- — Pass
WBson Technical Community College Penn: 24hr LC50 ac monit epis flhd (Grab) 1998 >100 — — -- — — —• — -- — -- —
NC0084581/001 Begn:l/1/2001 Frequency: 5 OWD/A NonComp: 1999 — — -- -- — — — -- -- NR1>100 —
County: Wilson Region: RRO Subbasin: NEU07 2000 —• — -- — H -- — — —
PF: 0.0144 Special 2001 _. — — — H -- — —
7QI0:0.0 IWC(%):100 Order: 2002 — — — — H
Wilson WW1? Perm chr lim: 90% 1998 — Pass(s) — Pass(s) — -- Pass(s) — — Pass(s) —
NC0023906/001 Begin:9/IR000 Frequency: Q Feb May Aug Nov + NonComp:Single 1999 — Pass(s) — Pass(s) -- -- Pass(s) — — Pass(s)
County: Wilson Region: RRO Subbasin: NEUO7 2000 -- Pass(s) -- Pass(s) -- --- Pass(s) -- — Pass(s) --
PF: 12.0 Special 2001 — Pass(s) Pass Pass(s) -- Fail(s) Lale/9100 >100(s) Fa9(s) 33.5.'100
7Q10: 0.5 IWC(%)97.37 Order: 2002 >100(s) Pass(s) — Pass(s)
Windsor WWTP PERM CHR LIM: 90% 1998 Late Pass — Pass — — Pass — — Pass
NC0026751/001 Begin:6/1/1997 Frequency: Q P/F + Jan Apr Jul Oct + NonComp:SINGLE 1999 Fan Pass Pass — -- FaiLFall 82 Late >100
County Berrie Region: WARO Subbasin: ROAIO 2000 >100 — — Pass — — Pass -- — Pass
PF: 1.15 Special 2001 pass — — Pass — — Pass — — Pass
7Q10: 0.0 IWC(%):100 Order: 2002 Pass — — Pass —
Winston-Salem Archie Elledge WWTP Perm P-2chr lim: 76% 1998 >96 — -- >96 — — >96 — >96 —
NC0037834/001 Begin:8/1/I999 Frequency: Q Jan Apr Jul Oct NonComp:ChV Avg 1999 >96 — — >96 — — >96 — — >96 — —
County. Forsyth Region: WSRO Subbasin: YADO4 2000 >96 — '96 — — '96 — — >96 — —
PF: 30 Special 2001 >98 — — >96 — — '96 — — 80.8 — —
7Q10: 15.0 IWC(%):75.6 Order. 2002 80.9 — — >96 —
Winston-Salem Lower Muddy Crk Perm P-2 chr lim: 5.5% 1998 >22 — — >22 — — >22 — — >22 —
NC00503421001 Begin:7/1/1999 Frequency. Q Jan Apr Jul Oct + NonComp:ChV Avg 1999 >22 — — >22 — — >22 -- — '22 — —
County. Forsyth Region: WSRO Subbasin: YADO4 2000 >22 — — >22 — — >22 -- — 15.56 — —
PF: 21.0 Special 2001 >22 — -- >22 — — >22 --- — >22 —
7Q10: 554.0 IWC(%):5.5 Order: 2002 3.89 >22 >22 >22 —
Woodfin Sanitary WTP Perm chr lim: 8'/. (Grab)
NC0083178/001 Begin 12/1/2000 Frequency: Q Jan Apr Jul Oct
County. Buncombe Region: ARO Subbasin: FRB02
PF:.03375 Special
7Q10: 0.61 IWC(%):8.0 Order:
+ NonComp:Single
1998 Late Pass — Late
1999 Pass — — NR
2000 Pass — — Pass
2001 Pass — Pass
2002 Pass — -- Pass
Fail
NR Pass -- — Late Fail Pass
Bt Pass -- — Pass -- ---
--- Pa55 --- — Pass -- ---
--- Fail >20 >20 Pass -- ---
Wright Chemical Corp/002 Perm chr Iim:34%
NC0003395/002 Begin:II/1/2000 Frequency: Q Feb May Aug Nov
County. Columbus Region: WIRO Subbasin: CPFI7
PF: 0.2 Special
7Q10: 0.6 IWC(%):34 Order:
+ NonComp:Single
1998 — Pass
1999 — Passsig —
2000 — Pass ---
2001 48.1 Pass 2002 — late Pass
— Pass — -- Pass ---
- NR/Pass Late Late
-- Pass — --- Pass -
-•- Pass — — Pass
— Pass
Pass
Pass
Pass
Fail
Pass
>90
Y Pre 1998 Data Available
LEGEND:
PERM = Permit Requirement LET = Administrative Letter -Target Frequency = Monitoring frequency: Q- Quarterly; M- Monthly; BM- Bimonthly; SA- Semiannually; A- Annually; OWD- Only when discharging; D- Discontinued monitoring requirement
Begin = First month required 7Q10 = Receiving stream low flow criterion (cfs) + = quarterly monitoring increases to monthly upon failure or NR Months that testing must occur - ex. Jan, Apr, Jul, Oct NonComp = Current Compliance Requirement
PF = Permitted flow (MGD) IWC%= Insveam waste concentration P/F — Pass/Fail tat AC = Acute CHR = Chronic
Data Notation: f - Fathead Minnow; ' - Ceriodaphnia sp.; my - Mysid shrimp; ChV - Chronic value; P - Mortality of stated percentage at highest concentration: at - Performed by DWQ Aquatic Tox Unit; bt • Bad test
Reporting Notation: -- - Data not required; NR - Not reported Facility Activity Status: 1 - Inactive, N - Newly Issued(fo construct); H - Active but not discharging; t-More data available for month in question; • = ORC signature needed
54

Reasonable Potential Request Form
Facility Name
Wilmington North WWTP
NPDES Number
NC0023965
Permitted Flow Rate (MGD)
8.0 MGD
7Q10 Stream Flow (cfs)
Q
Receiving Stream
s f-C
CI\PA k�
Stream Classification
J
30Q2 Stream Flow (cfs)
Average Stream Flow (Qavg) (cfs)
nr
Date Requested: January 29, 2002
Projected Date for Completion (add one week to date requested):
`iet5klY � F 1 `i f`i vova J
iva tit r (Nx\
1110�
2,6A
Requested Parameters (Spell out):
4-4thfrtr eke Vel
C Nam,
ci6,d/op-
\ rr
kc
6kivbmkt kiwt
!f 1'TV-0\A
�
Ccri
1-tg
Cc_ke_(
\4
P-66 l
N D6c,Otc i,

James A. Loughlin WWTP
IScs(Z7Q-1--S (D I -
Final Eff
LTMP DATA SUMMARY
l
1
f- CI
Zn
FORM
}
JAMES A. LOUGHLIN WWTP (NORTHSIDE)
_ _
NPDES# NC0023965
}L
FINAL EFFLUENT
-
- - --
[
Cd
-
SAMLE DATE
1-Apr-97
5-Aug-97
FLOW MGD
AL
NH3-N
As
Ba
CBOD
BOD5
- Cr
COD
Cu
CN
Fe
Pb
Hg
Ni
i O&G
organic
T-PO4
Ag
TKN
TS i
TSS
11
1.
Mo
Se
FL
NO2/NO3
0.0025�
N
4.27
0.102
15.20
0.0015
0.005
17
0.001
0.001
58.0
0.0025
54
0.008
0.0330
0.190
0.0001
0.0050
3.20
2.7
2.8
0.001
17.9
349
0.020
0.0500
0.0050
5.22
0.045
5.07
0.0015
0.005
5
6
~ 58.0
0.0025
47
0.032
0.0025
0.125
0.0025
0.0001
0.0050
1.70
2.4
3.9
0.001
7.4
296
0.015
0.0500
0.0050
4.15
6-N_ov-97
2-Mar-98
12-May-981
4 _Aug-98
5.16
0.075
8.62
0.0040
0.005
0.001 _ 76.0_
0.001 45.0
0.001 t- 53.0
0.001 76.0
0.0025
27
0.005
0.0025
0.190
0.0025
0.0001
0.0050
2.50
1.5
3.5
0.001
10.1
385
41
0.018
0.0500
0.0500
__ 0.0050
8.41
_
1 7.12
5.69
0.249
3.99
0.0015
0.011
12
11
_
0.0025
45
0.008
0.0160
0.290
0.0025
0.0001
0.0050'
3.00
0.2
2.1
0.001
6.7
303
10
0.031
0.0050
8.24
0.096
3.00
0.0015
0.005
0.0025
62
0.005
0.0070
0.105
0.0025
0.0001
0.0050
2.50
2.3
1.9
0.001
5.3
258
2
0.021
0.024
0.0500
0.0050
9.27
4.95
0.047
1.29
0.0015
0.005
3
0.0025
50
0.004
0.0070
0.125
0.0025
0.0001
0.0050
2.50
1.3
2.8
0.001
2.6
345
2
0.0500
0.0050
7.59
11-Nov-98
4.51
0.080
9.10
0.0015
0.005
_
invalid
_
0.001' 102.0
0.0025
invalid
0.004
0.0025
0.150
0.0025
0.0001
0.0050
6.80
0.2
2.7
0.001
9.3
384
~ 4
0.032
0.0500
0.0050
0.84
12.40
4-Mar-99
2-Jun-99
4.33
0.124
13.70
0.0015
0.005
14
0.001 68.0
0.0025
50
0.005
0.0025
0.215
0.0025
0.0001
0.0050
5.20
3.1
3.2
0.001
16.8
360
7
0.027
0.0500
0.0050
1.14
1.90
6.09
0.078
17.10
0.0015
0.005
16
18'
14
0.001
0.001'
0.001
162.0
0.0025
42
0.006
0.0025
0.130
0.0001
0.0050
2.50
1.5
3.0
0.001
18.6
403_
434
5
4'
0.016
0.041
0.034
0.029
0.026
0.0500
0.0050
0.65
1.90
3-Aug-99
2-Nov-99
7-Mar-00
5-Apr-00
11-Jul-00
12-Oct-00
Total
# Values
Average..
Maximum 1
Minumum I
Std. Dev.
5.49
0.037
18.20
0.00151
0.005
113.0
0.0025
41
0.028
0.0060
0.135
_0.0025
0.0025
0.0001
0.00�
0.0050
0.05
2.3
0.001
13.5
0.0500
0.0050
0.73
2.56
5.63
0.119
10.00
0.0015
0.011
79.0
0.0025
39
0.043
0.0025
0.240
0.0025
0.000W
2.50
1.1
2.3
0.001
11.1
399
11
0.0500
0.0500
0.0050
0.65
1.98
4.92
0.025
19.10
0.0015
0.005
invalid
11
0.001
0.001
83.0
0.0025
35
0.007
0.0130
0.125
0.0025
0.0001
0.0050
0.0050
10.00
0.4
3.0
0.001
19.5
375
41
0.0050
0.57
4.88
6.50
0.118
19.10
0.0015
0.005
4
16
75.0
0.0025
66
0.010
0.0130
0.190
0.0025
0.0001
0.0001
2.50
3.4
0.001
18.1
405
7'
0.0500
0.0500
0.0050
0.79
8.32
6.38
0.090
13.70
0.0015
0.005
4
24
0.001
0.001
0.015
15
0.001
0.00_1
0.001'
0.000,
113.0
89.01
1250.0
15
0.0025
64
0.009
0.0180
0.195
0.0025
0.0050
2.50
1.3
3.4
0.001
15.0
461
9L
13
0.017.
0.018
0.3691
15
0.025
0.041
0.015'
0.008
0.0050
0.83
7.11
7.49
0.148
14.60
0.0015
0.005
5
22
_
0.0025
53
0.010
0.0140
0.265
0.0025
0.0001
0.0050
0.0750
2.50
2.6
2.7
0.001
17.2
369
0.0500
0.0050
0.73
3.64
0.0015
154
94
83.75
1.433
171.77
0.0250
0.087
13
189
0.0375
675
0.184
0.1420
2.670
0.0375
49.95
20.5
42.8
0.015
189.1
5526
0.7500
15'
_0.0750
6.93
82.35
15
15
15
15
15
3
14
15
14
15
15
15
15
15,
0.0050
15
13
15
15
15
15
15
6'
15
0.0050
9
14
5.58
0.096
11.45
0.0017
0.006
4
13
83.3
0.0025
48
0.012
0.0095
0.178
0.0025
0.0001
3.33
1.6
2.9
0.001
12.6
368
0.0500,
0.05001
0.0500
• 0.0000
0.77
5.88
0.249
19.10
0.0040
0.011
5
24
3
r_ 162.0
45.0
29.8�
0.0025
66
0.043
0.0330
0.290
0.0025
0.0001
0.0001
0.0000
0.0050
~ 0.0050
10.00'
3.1
3.9
0.001
19.5
461
13
1
4,
0.0050
1.14
12.4
_7.493
4.27
0.025
1.29
0.0015
0.005
4~
0.0025
27
0.004
0.0025
0.105
0.0025
0.05
0.2
1.9
0.001
2.6
258
0.0050
0.57
1.9
_
0.98
0.055
6.07
0.0006
0.002
1
6
0.0000
11
0.012
0.0086
0.057
0.0000
0.0000 ! 2.38
1.0
; 0.6
0.000
5.5
53
0.0000
0.17
3.32
When analysis reveals <D.L.
1/2 detection is used.
All results except flow are in mg/I.

Facility Name =
NPDES #
Qw (MGD) =
7Q1Os (cfs)=
1WC (%) =
Wilmington (Northside) WWTP
NC0023965
8
0
100.00
FINAL RESULTS
Cyanide
Max. Pred Cw
Allowable Cw
85.7
1.0
RESULTS
Std Dev.
Mean
C.V.
Number
of data points
HITS
Mult Factor =
Max. Value
Max. Pred Cw
Allowable Cw
7.6155
6.5
1.1703
67
28
2.14
40.0 pg/1
85.7 pg/l
1.0 pg/1
NOTE: All data points below 10 ug/L are considered "not detected"
because of limitation in the NC state laboratory PQL
Parameter =
Standard =
Cyanide
1.0
Date n < Actual Data BDL=1/2DL
Jan-98 1 < 5.0 2.5
Feb-98 2 < 8.0 4.0
Mar-98 3 16.0 16.0
Apr-98 4 < 5.0 2.5
May-98 5 < 7.0 3.5
Jun-98 6 < 5.0 2.5
Jul-98 7 40.0 40.0
Aug-98 8 < 7.0 3.5
Sep-98 9 < 5.0 2.5
Oct-98 10 < 5.0 2.5
Nov-98 11 < 5.0 2.5
Dec-98 12 < 5.0 2.5
Jan-99 13 < 5.0 2.5
Feb-99 14 < 9.0 4.5
Mar-99 15 < 5.0 2.5
Apr-99 16 < 5.0 2.5
May-99 17 < 5.0 2.5
Jun-99 18 < 5.0 2.5
Jul-99 19 < 5.0 2.5
Aug-99 20 < 6.0 3.0
Sep-99 21 < 5.0 2.5
Oct-99 22 < 5.0 2.5
Nov-99 23 < 5.0 2.5
Dec-99 24 < 6.0 3.0
Jan-00 25 < 5.0 2.5
Fcb-00 26 10.0 10.0
Mar-00 27 13.0 13.0
Apr-00 28 13.0 13.0
May-00 29 < 5.0 2.5
Jun-00 30 < 8.0 4.0
Jul-00 31 18.0 18.0
Aug-00 32 < 5.0 2.5
Sep-00 33 < 5.0 2.5
Oct-00 34 14.0 14.0
if
w

Nov-00 35 13.0 13.0
Dec-00 36 21.0 21.0
Jan-01 37 23.0 23.0
Feb-01 38 < 8.0 4.0
Mar-01 39 < 5.0 2.5
Apr-01 40 < 5.0 2.5
May-01 41 < 5.0 2.5
Jun-01 42 < 5.0 2.5
Ju1-01 43 < 5.0 2.5
Aug-01 44 < 5.0 2.5
Sep-01 45 < 5.0 2.5
Oct-01 46 < 5.0 2.5
Nov-01 47 11.0 11.0
Dec-01 48 < 5.0 2.5
Apr-97 49 33.0 33.0 LTMP data
Aug-97 50 < 5.0 2.5 LTMP data
Nov-97 51 < 5.0 2.5 LTMP data
Mar-98 52 16.0 16.0 LTMP data
May-98 53 < 7.0 3.5 LTMP data
Aug-98 54 < 7.0 3.5 LTMP data
Nov-98 55 < 5.0 2.5 LTMP data
Mar-99 56 < 5.0 2.5 LTMP data
Jun-99 57 < 5.0 2.5 LTMP data
Aug-99 58 < 6.0 3.0 LTMP data
Nov-99 59 < 5.0 2.5 LTMP data
Mar-00 60 13.0 13.0 LTMP data
Apr-00 61 13.0 13.0 LTMP data
Jul-00 62 18.0 18.0 LTMP data
Oct-00 63 14.0 14.0 LTMP data
Jan-02 64 < 5.0 2.5
Feb-02 65 < 5.0 2.5
Mar-02 66 < 5.0 2.5
Apr-02 67 < 5.0 2.5

Facility Name =
NPDES # =
Qw (MGD) =
7Q10s (cfs)=
1WC (%) _
- Wilmington (Northside) WWTP
NC0023965
8
0
100.00
FINAL RESULTS
Silver
Max. Pred Cw
Allowable Cw
11.84
0.10
RESULTS
Std Dev.
Mean
C.V.
Number
of data points
HITS
Mult Factor =
Max. Value
Max. Pred Cw
Allowable Cw
1.0972
2.3
0.4873
63
7
1.48
8.00 ug/1
11.84 pg/1
0.10 µg/1
Parameter =
Standard =
Silver
0.10
Date n < Actual Data BDL=1/2DL
Jan-98 1 < 8.0 4.0
Feb-98 2 < 2.0 1.0
Mar-98 3 2.0 2.0
Apr-98 4 < 2.0 1.0
May-98 5 < 2.0 1.0
Jun-98 6 < 2.0 1.0
Ju1-98 7 < 2.0 1.0
Aug-98 8 < 2.0 1.0
Sep-98 9 < 2.0 1.0
Oct-98 10 < 2.0 1.0
Nov-98 11 < 2.0 1.0
Dec-98 12 7.0 7.0
Jan-99 13 8.0 8.0
Feb-99 14 2.6 2.6
Mar-99 15 < 2.0 1.0
Apr-99 16 < 2.0 1.0
May-99 17 < 2.0 1.0
Jun-99 18 < 2.0 1.0
Ju1-99 19 < 2.0 1.0
Aug-99 20 < 2.0 1.0
Sep-99 21 < 2.0 1.0
Oct-99 22 < 2.0 1.0
Nov-99 23 < 2.0 1.0
Dec-99 24 < 2.0 1.0
Jan-00 25 < 2.0 1.0
Feb-00 26 < 2.0 1.0
Mar-00 27 < 2.0 1.0
Apr-00 28 < 2.0 1.0
May-00 29 < 2.0 1.0
Jun-00 30 < 2.0 1.0
Jul-00 31 < 2.0 1.0
Aug-00 32 < 2.0 1.0
Sep-00 33 < 2.0 1.0
Oct-00 34 < 2.0 1.0
Nov-00 35 2.0 2.0
Dec-00 36 < 2.0 1.0
Jan-01 37 < 2.0 1.0
Feb-01 38 < 2.0 1.0
Mar-01 39 6.0 6.0
Apr-01 40 < 2.0 1.0

May-01 41 < 2.0 1.0
Jun-01 42 < 2.0 1.0
Ju1-01 43 < 2.0 1.0
Aug-01 44 2.0 2.0
Sep-01 45 < 2.0 1.0
Oct-01 46 < 2.0 1.0
Nov-01
Dec-01 47 < 2.0 1.0
Apr-97 48 < 2.0 1.0
Aug-97 49 < 2.0 1.0
Nov-97 50 < 2.0 1.0
Mar-98 51 < 2.0 1.0
May-98 52 < 2.0 1.0
Aug-98 53 < 2.0 1.0
Nov-98 54 < 2.0 1.0
Mar-99 55 < 2.0 1.0
Jun-99 56 < 2.0 1.0
Aug-99 57 < 2.0 1.0
Nov-99 58 < 2.0 1.0
Mar-00 59 < 2.0 1.0
Apr-00 60 < 2.0 1.0
Ju1-00 61 < 2.0 1.0
Oct-00 62 < 2.0 1.0
Jan-02
Feb-02
Mar-02 63 < 2.0 1.0
Apr-02

Facility Name =
NPDES #
Qw (MGD)=
7Q1Os (cfs)=
1WC (%) _
Wilmington (Northside) WWTP
NC0023965
8
0
100.00
FINAL RESULTS
Cadmium
Max. Fred Cw
Allowable Cw
1.9
5.0
RESULTS
Std Dcv.
Mcan
C.V.
Numbcr
of data points
HITS
Mult Factor =
Max. Value
Max. Prcd Cw
Allowable Cw
0.4451
0.7
0.6049
39
0
1.85
1.0 P8n
1.9 P8/1
5.0 Pgll
Parameter
Standard =
Cadmium
5.0
Date n < Actual Data BDL=1/2DL
Jan-98 1 < 2.0 1.0
Fcb-98
Mar-98
Apr-98
May-98
Jun-98
JuI-98
Aug-98
Scp-98
Oct-98
Nov-98
Dcc-98
Jan-99 2 < 2.0 1.0
Fcb-99 3 < 2.0 1.0
Mar-99 4 < 2.0 1.0
Apr-99 0.0
May-99 0.0
Jun-99 5 < 2.0 1.0
Ju!-99 0.0
Aug-99 6 < 2.0 1.0
Scp-99 0.0
Oct-99 0.0
Nov-99 7 < 2.0 1.0
Dec-99 0.0
Jan-00 0.0
Fcb-00 0.0
Mar-00 8 < 2.0 1.0
Apr-00 9 < 2.0 1.0
May-00 0.0
Jun-00 0.0
Jul-00 10 < 2.0 1.0
Aug-00 0.0
Scp-00 0.0
Oct-00 11 < 2.0 1.0
Nov-00 0.0
Dcc-00 0.0
Jan-01 12 < 2.0 1.0
Fcb-01 13 < 2.0 1.0
Mar-01 14 < 2.0 1.0
Apr-0I 15 < 2.0 1.0
May-01 16 < 2.0 1.0
Jun-01 17 < 2.0 1.0
Jul-01 18 < 2.0 1.0
Aug-0I 19 < 2.0 1.0
Scp-01 20 < 2.0 1.0
P8]1

Oct-01 21 < 2.0 1.0
Nav•01 22 < 2.0 1.0
Dec-01 23 < 2.0 1.0
Apr-97 24 < 2.0 1.0 LTMP data
Aug-97 25 < 2.0 1.0 LTMP data
Nov-97 26 < 2.0 1.0 LTMP data
Mar-98 27 < 2.0 1.0 LTMP data
May-98 28 < 2.0 1.0 LTMP data
Aug-98 29 < 2.0 1.0 LTMP data
Nov-98 30 < 2.0 1.0 LTMP data
Mar-99 31 < 2.0 1.0 LTMP data
Jun-99 32 < 2.0 1.0 LTMP data
Aug-99 33 < 2.0 1.0 LTMP data
Nov-99 34 < 2.0 1.0 LTMP data
Mar-00 35 < 2.0 1.0 LTMP data
Apr-00 36 < 2.0 1.0 LTMP data
Jul-00 37 < 2.0 1.0 LTMP data
Oct-00 38 < 2.0 1.0 LTMP data
Jan-02
Fcb-02
Mar-02 39 < 2.0 1.0
Apr-02

Facility Name =
NPDES # =
Qw (MGD) =
7Q1Os (cfs)=
1WC (%) =
Wilmington (Northside) WWTP
NC0023965
8
0
100.00
FINAL RESULTS
Copper
Max. Pred Cw
Allowable Cw
280.5
3.0
RESULTS
Std Dev.
Mean
C.V.
Number
of data points
HITS
Mult Factor =
Max. Value
Max. Pred Cw
Allowable Cw
15.5611
10.9
1.4321
67
66
2.38
118.0 µg/1
280.5 µg/1
3.0 pg/1
Parameter =
Standard =
Copper
3.0
Date n < Actual Data BDL=1/2DL
Jan-98 1 4.0 4.0
Feb-98 2 4.0 4.0
Mar-98 3 8.0 8.0
Apr-98 4 6.0 6.0
May-98 5 5.0 5.0
Jun-98 6 5.0 5.0
Jul-98 7 5.0 5.0
Aug-98 8 4.0 4.0
Sep-98 9 8.0 8.0
Oct-98 10 12.0 12.0
Nov-98 11 4.0 4.0
Dec-98 12 7.0 7.0
Jan-99 13 4.0 4.0
Feb-99 14 6.0 6.0
Mar-99 15 5.0 5.0
Apr-99 16 8.0 8.0
May-99 17 5.0 5.0
Jun-99 18 6.0 6.0
Jul-99 19 5.0 5.0
Aug-99 20 28.0 28.0
Sep-99 21 19.0 19.0
Oct-99 22 6.0 6.0
Nov-99 23 43.0 43.0
Dec-99 24 11.0 11.0
Jan-00 25 8.0 8.0
Feb-00 26 11.0 11.0
Mar-00 27 7.0 7.0
Apr-00 28 10.0 10.0
May-00 29 118.0 118.0
Jun-00 30 11.0 11.0
Jul-00 31 9.0 9.0
Nell

Aug-00 32 7.0 7.0
Sep-00 33 6.0 6.0
Oct-00 34 10.0 10.0
Nov-00 35 12.0 12.0
Dec-00 36 8.0 8.0
Jan-01 37 10.0 10.0
Feb-01 38 7.0 7.0
Mar-01 39 5.0 5.0
Apr-01 40 6.0 6.0
May-01 41 5.0 5.0
Jun-01 42 8.0 8.0
Ju1-01 43 7.0 7.0
Aug-01 44 7.0 7.0
Sep-01 45 < 0.0
Oct-01 46 5.0 5.0
Nov-01 47 16.0 16.0
Dec-01 48 7.0 7.0
Apr-97 49 8.0 8.0 LTMP data
Aug-97 50 32.0 32.0 LTMP data
Nov-97 51 5.0 5.0 LTMP data
Mar-98 52 8.0 8.0 LTMP data
May-98 53 5.0 5.0 LTMP data
Aug-98 54 4.0 4.0 LTMP data
Nov-98 55 4.0 4.0 LTMP data
Mar-99 56 5.0 5.0 LTMP data
Jun-99 57 6.0 6.0 LTMP data
Aug-99 58 28.0 28.0 LTMP data
Nov-99 59 43.0 43.0 LTMP data
Mar-00 60 7.0 7.0 LTMP data
Apr-00 61 10.0 10.0 LTMP data
Jul-00 62 9.0 9.0 LTMP data
Oct-00 63 10.0 10.0 LTMP data
Jan-02 64 9.0 9.0
Feb-02 65 7.0 7.0
Mar-02 66 5.0 5.0
Apr-02 67 5.0 5.0

Facility Name =
NPDES # =
Qw (MGD) =
7Q10s (cfs)=
IWC (%)
Wilmington (Northside) WWTP
NC0023965
8
0
100.00
FINAL RESULTS
Chromium
Max. Pred Cw
Allowable Cw
12.7
20.0
RESULTS
Std Dev.
Mean
C.V.
Number
of data points
HITS
Mult Factor =
Max. Value
Max. Pred Cw
Allowable Cw
1.2509
1.6
0.7612
39
0
2.11
6.0 pg/1
12.7 pg/1
20.0 pg/1
Parameter
Standard =
Chromium
20.0
Date n < Actual Data BDL=1/2DL
Jan-98 1 < 2.0 1.0
Feb-98
Mar-98
Apr-98
May-98
Jun-98
Jul-98
Aug-98
Sep-98
Oct-98
Nov-98
Dec-98
Jan-99 2 2.0 2.0
Feb-99 3 2.6 2.6
Mar-99 4 < 2.0 1.0
Apr-99 0.0
May-99 0.0
Jun-99 5 < 2.0 1.0
JuI-99 0.0
Aug-99 6 < 2.0 1.0
Sep-99 0.0
Oct-99 0.0
Nov-99 7 < 2.0 1.0
Dec-99 0.0
Jan-00 0.0
Feb-00 0.0
Mar-00 8 < 5.0 2.5
Apr-00 9 < 5.0 2.5
May-00 0.0
Jun-00 0.0
Ju1-00 10 < 5.0 2.5

Aug-00 0.0
Sep-00 0.0
Oct-00 11 < 2.0 1.0
Nov-00 0.0
Dec-00 0.0
Jan-01 12 < 5.0 2.5
Feb-01 13 < 5.0 2.5
Mar-01 14 < 5.0 2.5
Apr-01 15 < 5.0 2.5
May-01 16 < 5.0 2.5
Jun-01 17 < 5.0 2.5
JuI-01 18 < 5.0 2.5
Aug-01 19 6.0 6.0
Sep-01 20 < 2.0 1.0
Oct-01 21 < 2.0 1.0
Nov-01 22 < 2.0 1.0
Dec-01 23 < 5.0 2.5
Apr-97 24 < 5.0 2.5 LTMP data
Aug-97 25 < 5.0 2.5 LTMP data
Nov-97 26 < 5.0 2.5 LTMP data
Mar-98 27 < 5.0 2.5 LTMP data
May-98 28 < 5.0 2.5 LTMP data
Aug-98 29 < 5.0 2.5 LTMP data
Nov-98 30 < 5.0 2.5 LTMP data
Mar-99 31 < 5.0 2.5 LTMP data
Jun-99 32 < 5.0 2.5 LTMP data
Aug-99 33 < 5.0 2.5 LTMP data
Nov-99 34 < 5.0 2.5 LTMP data
Mar-00 35 < 5.0 2.5 LTMP data
Apr-00 36 < 5.0 2.5 LTMP data
Jul-00 37 < 5.0 2.5 LTMP data
oct-oo 38 < 5.0 2.5 LTMP data
Jan-02
Feb-02
Mar-02 39 < 5.0 2.5
Apr-02

•
•
Facility Name =
NPDES N =
Qw (MGD) =
7QJOa (cfa)=
1WC(R)=
Wilmington (Nortluidc) WWTP
NC0023965
8
0
100.00
FINAL RESULTS
Mercury
Max. Prod Cw
Allowable Cw
0.762
0.025
RESULTS
SW Dev.
Mean
C.V.
HITS
Number
of data points
HITS
Mali Factor =
Max. Valve
Max. Fred Cw
Allowable Cw
0.0616
0.112
0.5503
3
67
3
1.525j
0.500 µgil
0.762 µgA
0.025 WI
Parameter =
Standard =
Mercury
0.025
Date n < Actual Data BDL=1l2DL
Jan-98 I < 0.2 0.1
Fcb-98 2 < 0.2 0.1
Mar-98 3 _ 0.2 0.2
Apr-98 4 < 0.2 0.1
May-98 5 < 0.2 0.1
Jun-98 6 < 0.2 0.1
Jul-98 7 < 0.2 0.1
Aug-98 8 < 0.2 0.1
Scp-98 9 < 0.2 0.1
Oct-98 10 < 0.2 0.1
Nov-98 11 < 0.2 0.1
Dcc-98 12 < 0.2 0.1
Jan-99 13 0.4 0.4
Fcb-99 14 < 0.2 0.1
Mar-99 15 < 0.2 0.1
Apr-99 16 < 0.2 0.1
May-99 17 < 0.2 0.1
Jun-99 18 < 0.2 0.1
Jul-99 19 < 0.2 0.1
Aug-99 20 < 0.2 0.1
Sep-99 21 < 0.2 0.1
Oct-99 22 < 0.2 0.1
Nov-99 23 < 0.2 0.1
Doc-99 24 < 0.2 0.1
Jan-00 25 < 0.2 0.1
Fcb-00 26 < 0.2 0.1
Mar-00 27 < 0.2 0.1
Apr-00 28 < 0.2 0.1
May-00 29 < 0.2 0.1
Jun-00 30 0.5 0.5
Jul-00 31 < 0.2 0.1
Aug-00 32 < 0.2 0.1
Sep-00 33 < 0.2 0.1
Oct-00 34 < 0.2 0.1
Nov-00 35 < 0.2 0.1
Dec-00 36 < 0.2 0.1
Jan-01 37 < 0.2 0.1
Fcb-0I 38 < 0.2 0.1
Mu-01 39 < 0.2 0.1

a
Apr-01 40 < 0.2 0.1
May-01 41 < 0.2 0.1
Jun-0l 42 < 0.2 0.1
Jul-01 43 < 0.2 0.1
Aug-01 44 < 0.2 0.1
Sep-01 45 < 0.2 0.1
Oct-01 46 < 0.2 0.1
Nov-01 47 < 0.2 0.1
Dec-01 48 < 0.2 0.1
Apr-97 49 < 0.2 0.1 LTMP data
Aug-97 50 < 0.2 0.1 LTMP data
Nov-97 51 < 0.2 0.1 LTMP data
Mar-98 52 < 0.2 0.1 LTMP data
May-98 53 < 0.2 0.1 LTMP data
Aug-98 54 < 0.2 0.1 LTMP data
Nov-98 55 < 0.2 0.1 LTMP data
Mar-99 56 < 0.2 0.1 LTMP data
Jun-99 57 < 0.2 0.1 LTMP data
Aug-99 58 < 0.2 0.1 LTMP data
Nov-99 59 < 0.2 0.1 LTMP data
Mar-00 60 < 0.2 0.1 LTMP data
Apr-00 61 < 0.2 0.1 LTMP data
Jul-00 62 < 0.2 0.1 LIMP data
Oa-00 63 < 0.2 0.1 LTMP data
Jan-02 64 < 0.2 0.1
Feb-02 65 < 0.2 0.1
Mar-02 66 < 0.2 0.1
Apr-02 67 < 0.2 0.1

Facility Name =
NPDES # =
Qw (MGD) =
7Q10s (cfs)=
IWC (%) =
Wilmington (Northside) WWTP
NC0023965
8
0
100.00
FINAL RESULTS
Nickel
Max. Pred Cw
Allowable Cw
5.9
8.3
RESULTS
Std Dev.
Mean
C.V.
Number
of data points
HITS
Mult Factor =
Max. Value
Max. Pred Cw
Allowable Cw
0.7333
4.8
0.1542
39
1.18
5.0 µg/1
5.9 pg/1
8.3 µg/1
Parameter =
Standard =
Nickel
8.3
Date n < Actual Data BDL=1/2DL
Jan-98
Feb-98
Mar-98
Apr-98
May-98
Jun-98
JuI-98
Aug-98 1 < 10.0 5.0
Sep-98
Oct-98
Nov-98
Dec-98
Jan-99 2 3.0 3.0
Feb-99 3 < 10.0 5.0
Mar-99 4 < 10.0 5.0
Apr-99
May-99
Jun-99 5 < 10.0 5.0
Jul-99
Aug-99 6 < 10.0 5.0
Sep-99
Oct-99
Nov-99 7 < 10.0 5.0
Dec-99
Jan-00
Feb-00
Mar-00 8 < 5.0 2.5
Apr-00 9 < 5.0 2.5
May-00
Jun-00
Jul-00 10 < 5.0 2.5
Aug-00
Sep-00
Oct-00 11 < 10.0 5.0
Outlire?

Nov-00
Dec-00
Jan-01 12 < 10.0 5.0
Feb-01 13 < 10.0 5.0
Mar-01 14 < 10.0 5.0
Apr-01 15 < 10.0 5.0
May-01 16 < 10.0 5.0
Jun-01 17 < 10.0 5.0
Ju1-01 18 < 10.0 5.0
Aug-01 19 < 10.0 5.0
Sep-01 20 < 10.0 5.0
Oct-01 21 < 10.0 5.0
Nov-01 22 < 10.0 5.0
Dec-01 23 < 10.0 5.0
Apr-97 24 < 10.0 5.0
Aug-97 25 < 10.0 5.0
Nov-97 26 < 10.0 5.0
Mar-98 27 < 10.0 5.0
May-98 28 < 10.0 5.0
Aug-98 29 < 10.0 5.0
Nov-98 30 < 10.0 5.0
Mar-99 31 < 10.0 5.0
Jun-99 32 < 10.0 5.0
Aug-99 33 < 10.0 5.0
Nov-99 34 < 10.0 5.0
Mar-00 35 < 10.0 5.0
Apr-00 36 < 10.0 5.0
Jul-00 37 < 10.0 5.0
Oct-00 38 < 10.0 5.0
Jan-02
Feb-02
Mar-02 39 < 10.0 5.0
Apr-02
LTMP data
LTMP data
LTMP data
LTMP data
LTMP data
LIMP data
LTMP data
LIMP data
LTMP data
LTMP data
LTMP data
LTMP data
LTMP data
LTMP data
LTMP data

. u
Facility Name =
NPDES#=
Qw (MGD) =
7Q10s (cfs)=
JWC (%) =
Wilmington (Northside) WWTP
NC0023965
8
0
100.00
FINAL RESULTS
Lcad
Max. Prcd Cw
Allowable Cw
2.7
0.0
RESULTS
Std Dcv.
Mean
C.V.
Numbcr
of data points
HITS
Mult Factor =
Max. Value
Max. Prcd Cw
Allowable Cw
0.1761
2.5
0.0713
39
1
1.08
2.5 NPR
2.7 pg/I
25.(1 pg/i
Date
Jan-98
Fcb-98
Mar-98
Apr-98
May-98
Jun-98
Jul-98
Parameter =
Standard =
Lcad
25.0
< Actual Data BDL=1/2DL
Pgfi
Aug-98 1 < 5.0 2.5
Scp-98
Oct-98
Nov-98
Dec-98
Jan-99 2 1.4 1.4 Outlirc ?
Fcb-99 3 < 5.0 2.5
Mar-99 4 < 5.0 2.5
Apr-99
May-99
Jun-99 5 < 5.0 2.5
Jul-99
Aug-99 6 < 5.0 2.5
Scp-99
Oct-99
Nov-99 7 < 5.0 2.5
Dec-99
Jan -(XI
Fcb4l0
Mar-(X) 8 < 5.0 2.5
Apr-(X) 9 < 5.0 2.5
May-00
Jun-(X)
Jul -IX) 10 < 5.0 2.5
Aug-00
Scp-(X)
Oct-(X) 11 < 5.0 2.5
Nov-(X)
Dcc4X)
Jan-01 12 < 5.0 2.5
Fcb4)I 13 < 5.0 2.5
Mar-01 14 < 5.0 2.5
Apr-01 15 < 5.0 2.5
May-01 16 < 5.0 2.5
Jun-01 17 < 5.0 2.5
Jul-01 18 < 5.0 2.5
Aug-01 19 < 5.0 2.5
Scp-01 20 < 5.0 2.5
Oct-01 21 < 5.0 2.5
Nov-01 22 < 5.0 2.5
Dcc-01 23 < 5.0 2.5

I. .4
Apr-97 24 < 5.0 2.5 LTMP data
Aug-97 25 < 5.0 2.5 LTMP data
Nov-97 26 < 5.0 2.5 LTMP data
Mar-98 27 < 5.0 2.5 LTMP data
May-98 28 < 5.0 2.5 LTMP data
Aug-98 29 < 5.0 2.5 LTMP data
Nov-98 30 < 5.0 2.5 LTMP data
Mar-99 3I < 5.0 2.5 LTMP data
Jun-99 32 < 5.0 2.5 LTMP data
Aug-99 33 < 5.0 2.5 LTMP data
Nov-99 34 < 5.0 2.5 LTMP data
Mar-00 35 < 5.0 2.5 LTMP data
Apr.00 36 < 5.0 2.5 LTMP data
Jul-0(} 37 < 5.0 2.5 LTMP data
Oct-00 38 < 5.0 2.5 LTMP data
Jan-02
Fcb•02
Mar-02 39 < 5.0 2.5
Apr-02

Facility Name =
NPDES #
Qw (MGD)
7Q10s (cfs)=
1WC (%) =
Wilmington (Northside) WWTP
NC0023965
8
0
100.00
FINAL RESULTS
Zinc
Max. Pred Cw
Allowable Cw
Allowable #/day
179.8
86.0
0.0
RESULTS
Std Dev.
Mean
C.V.
Number
of data points
HITS
Mult Factor =
Max. Value
Max. Pred Cw
Allowable Cw
15.1059
24.4
0.6189
38
36
1.89
95.0 pg/1
179.8 pg/1
86.0 pg/1
Date
Jan-98
Feb-98
Mar-98
Apr-98
May-98
Jun-98
Jul-98
Parameter =
Standard =
Zinc
86.0
n < Actual Data BDL=1/2DL
Aug-98 1 24.0 24.0
Sep-98
Oct-98
Nov-98
Dec-98
Jan-99 2 24.0 24.0
Feb-99 3 5.0 5.0
Mar-99 4 27.0 27.0
Apr-99
May-99
Jun-99 5 16.0 16.0
Jul-99
Aug-99 6 41.0 41.0
Sep-99
Oct-99
Nov-99 7 34.0 34.0
Dec-99
Jan-00
Feb-00
Mar-00 8 29.0 29.0
Apr-00 9 26.0 26.0
May-00
Jun-00
Jul-00 10 17.0 17.0
Aug-00
Sep-00
Oct-00
Nov-00
Dec-00

Jan-01 11 30.0 30.0
Feb-01 12 18.0 18.0
Mar-01 13 37.0 37.0
Apr-01 14 16.0 16.0
May-01 15 13.0 13.0
Jun-01 16 20.0 20.0
Jul-01 17 17.0 17.0
Aug-01 18 95.0 95.0
Sep-01 19 < 5.0 2.5
Oct-01 20 < 10.0 5.0
Nov-01 21 33.0 33.0
Dec-01 22 14.0 14.0
Apr-97 23 20.0 20.0 LTMP data
Aug-97 24 15.0 15.0 LTMP data
Nov-97 25 18.0 18.0 LTMP data
Mar-98 26 31.0 31.0 LTMP data
May-98 27 21.0 21.0 LTMP data
Aug-98 28 24.0 24.0 LTMP data
Nov-98 29 32.0 32.0 LTMP data
Mar-99 30 27.0 27.0 LTMP data
Jun-99 31 16.0 16.0 LTMP data
Aug-99 32 41.0 41.0 LTMP data
Nov-99 33 24.0 24.0 LTMP data
Mar-00 34 39.0 39.0 LTMP data
Apr-00 35 26.0 26.0 LTMP data
Jul-00 36 17.0 17.0 LTMP data
Oct-00 37 18.0 18.0 LTMP data
Jan-02
Feb-02
Mar-02 38 15.0 15.0
Apr-02

City of Wilmington and New Hanover County
Division of Water Quality Meeting
Northside WWTP Expansion
3/13/02
AGENDA
Welcome and Introductions 6PoM-s6 lb
Purpose of meeting
Discuss DWQ response to spec limits request
City/County Understanding of the Response
DWQ agrees with selection of EFDC modeling framework p6,39 CiDL.L-1> use
DWQ acknowledges our model could be enhanced to form basis for TMDL r fl 0
Additional data needed for TMDL development
DWQ agrees that marsh and wetland inputs should be considered
Eventual TMDL developed from our model would be used to evaluate future
allocations to Wilmington and other point sources
DWQ believes the discharge point will be in Northeast Creek
The speculative limits do not deviate from the Basin Plan policy
A consolidated review of the data and data sources used in the model should be
presented
An environmental review will be required and we are prepared to provide it
Clarify the Intent of the Submitted Model
Model as submitted not intended as the final product for TMDL development
Model as submitted intended to portray the impact of the discharge from the City
of Wilmington's two WWTP's on the Cape Fear River
Model does address impact of City and other point sources on DO levels in the
Lower Cape Fear Basin
We agree the model could serve as the framework for eventual TMDL
development
A consolidated review of the data and data sources was included as Appendix A
in the report
City/County Perception of DWQ Concerns
Basin plan precedence
Insufficient data to support deviation from basin plan
Lack of TMDL
3`d party challenges

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City/County Objectives and Concerns
Comply with reasonable technically based standards
Anti -backsliding rules j,� IkC Peilio 1 5 i s`h� �r� g.2oo/L
Protecting waste load a location for future growth
Operational compliance JPI (5'5
Fiscal responsibility
Meeting regional needs
Constructing a state-of-the-art facility j jp4 ` 2 74 0(5.
How can we work together?
Common interests
Protecting the environment
Regional treatment facility (05/t0N5 /P'/140,
Cost effective solutions
Technical basis for allocations
Regulatory compliance
Avoiding 3"1 party challenges
TMDL determination �v 'Nf/T aP�ycl (Ni o C�eu
Meeting the spirit of he Basin Plan
Does DWQ have suggestions for meeting our mutual goals?
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City/County Suggested Solution
City/County accept 5/1 limit but retain current waste load allocation for
NS and SS
City/County eliminate chlorine disinfection
City/County provide facilities to produce both Class A and Class B
biosolids
City/County provide septage and grease receiving station for service area
City/County provide existing model for DWQ use in TMDL determination
DWQ achieves reduction in mass loading in the Lower Cape Fear River
DWQ structures permit to allow flexibility if TMDL determination
suggests less stringent limits are appropriate for Lower Cape Fear Basin
DWQ accepts EA in lieu of EIS
DWQ provides expedited construction plan review
City receives memorandum of understanding from DWQ by March 31,
2002
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WATF9
QGy William G. Ross, Jr., Secretary
Michael F. Easley
Governor
North Carolina Department of Environment and Natural Resources
Gregory J. Thorpe, Ph.D., Acting Director
Division of Water Quality
Water Quality Section/ NPDES Unit
FAX: [phone]
2/27/02
FAX TO: Hugh Caldwell, P.E. Director of Public Utilities
Re.: Wilmington Spec. Limits/ NPDES
FAX NUMBER: 910 341 5881
FROM: Susan A. Wilson, P.E.0
PHONE: [phone], ext. 510,
NO. OF PAGES INCLUDING THIS SHEET: ' 4
Mr. Caldewell:
This fax reflects the speculative limits letter for the City of Wilmington's Northside WWTP expansion. A hard copy
will follow. Also, specific review of the model will follow with the hardcopy (that information was not faxed).
Susan Wilson

CITY OF WILMINGTON
PUBLIC UTILITIES DEPARTMENT
June 21, 2001
Mr. Bill Reid
Point Source Branch Supervisor
Division of Water Quality
DENR
Post Office Box 29535
Raleigh, NC 27626-0535
P.O. Box 1810
WILMINGTON, NC 28402
TDD [phone]
Re: City of Wilmington, Northside Wastewater Treatment Plant Expansion
Cape Fear River Water Quality Modeling Report and Speculative Limits Request
Dear Mr. Reid:
As you are aware from our previous correspondence and recent meetings, the City of Wilmington
and New Hanover County have completed preliminary planning for an expansion of the
Wilmington Northside facility from 8 MGD to 16 MGD to address the region's wastewater
treatment needs. We are now at the point where further plant design requires information from the
Division of Water Quality (DWQ) regarding expected NPDES permit limits that the expanded
facility would need to meet. The City and County respectfully request that these speculative limits
be based on the best technical and scientific information available.
The City and County recognize that the Division has previously recommended use of a
conservative policy for the lower Cape Fear River Basin that allocates BODS and NH3N limits of
5 mg/1 and 1 mg/1, respectively, for both new and expanding discharges. We also know that this
policy was based on observing values of dissolved oxygen (DO) in the lower estuary that
periodically drop below 5 mg/1 on a daily average and 4 mg/l on an instantaneous basis during
critical summer conditions. Furthermore, these low DO observations have been assessed by the
Division as only partially supporting use in the estuary, which has resulted in the listing of a 5000-
acre segment on the North Carolina 303(d) list. This assessment, however, did not include a
detailed study of the causes and sources of low DO. Additionally, the Division did not have a
water quality model that it believed reliable enough to evaluate wasteload allocations that would
be protective of water quality, thus the conservative basin policy was developed. The City and
County have invested heavily in developing a sound scientific basis for evaluating sources of DO
impacts on the lower estuary. By providing this information to the Division, the City and County
have given DWQ the scientific information that it needs to make wasteload allocation decisions
for oxygen demanding wastes based on technically defensible predictive modeling rather than
conservative policy.
Enclosed for your review and use is a copy of the report, 3-Dimensional EFDC Water Quality
Model of the Lower Cape Fear River and Its Estuary, prepared by Tetra Tech, Inc. ( May, 2001).
The report details the extensive amount of data compiled and used to develop a reliable model for
the lower Cape Fear system. All modeling equations and assumptions have been documented
thoroughly, as have the results of the model calibration and verification analyses. Error analyses
ADMINISTRATION ENVIRONMENTAL SERVICES UTILITY SERVICES WASTEWATER TREATMENT
VOICE [phone] VOICE [phone] VOICE [phone] LOUGHLIN PLANT MAFFITT PLANT
FAx [phone] FAx [phone] FAX [phone] VOICE [phone] VOICE [phone]
FAX [phone]
WATER TREATMENT
VOICE [phone]
FAX [phone]

Mr. Bill Reid
June 21, 2001
Page 2 of 4
performed during the model calibration and verification process demonstrate that the model's
predictive capability is well within the acceptable ranges defined by the U.S. Environmental
Protection Agency's Technical Guidance Manual for Performing Estuary Wasteload Allocations
(USEPA, 1990) [See modeling report sections 3.4, 3.5, 5.4, and 5.5]. Furthermore, model
sensitivity analysis provides insight to the likely magnitude for each source component
contributing to the dissolved oxygen deficit. DO deficit is defined here as the difference between
DO saturation and observed/predicted concentrations. These analyses demonstrate that
collectively, even at maximum permitted loads, point sources account for only 10 — 25 percent of
the DO deficit [See Chapter 6 of the enclosed modeling report]. Sediment oxygen demand (SOD)
in the river's mainstem and the effect of BOD and SOD in the adjacent swamps, on the other
hand, are predicted to account for 65 — 90 percent of the deficit. We are confident that, after you
have reviewed the modeling report, you will find sufficient information to support a technically
defensible and scientifically sound wasteload allocation for the Northside WWTP expansion.
Based on our review of the modeling results, the City and County recommend that the Division
support speculative limits that maintain the current permitted BOD5 and NH3N mass loads for
the Wilmington Northside facility and New Hanover County allocation. These mass loads are
summarized in the table below.
Plant
Description
Flow
(MGD)
BOD5
(mg/L)
BOD5 Load
(Ibs/day)
NH3N
(mg/L)
NH3N Load
(Ibs/day)
Existing Permits
Wilm. Northside
8.0
30
2002.8
20*
1335.2
New Hanover Co.
4.0
5
166.9
2
66.8
*Current permit contains no limit on Ammonia;
DWQ assumes 20 mgll for secondary treatment.
Total 2169.7
Total 1402.0
Specifying limits that maintain the existing mass load allocation is justified as follows:
• Hydrodynamic modeling and dye studies demonstrate that the Northside effluent is diluted by
a factor greater than 300:1 in the Northeast Cape Fear and the listed segment of the Cape Fear
River mainstem during critical conditions. Dilution of the Southside effluent is predicted to be
approximately 180:1 or greater in the listed segment. [See Chapter 4 of the modeling report.]
• Water quality modeling results demonstrate that removal of both the Wilmington Northside
and Southside permitted loads would likely result in increases of DO of approximately 0.05
mg/1 on average during the summer season, and no greater than 0.19 mg/1 on the worst day
during the critical summer months. [See section 6.3 of the modeling report.] Note that the
Southside's current permitted load (at 12.0 MGD with BOD5 limit of 30 mg/L and no NH3N
limit) is 50% greater than the Northside load at its current permitted flow of 8.0 MGD.
• Application of the basin policy limits to a Northside flow of 16.0 MGD would reduce
wasteload allocations to 668 lbs/day BOD5 and 133 lbs/day NH3N. The predicted difference

Mr. Bill Reid
June 21, 2001
Page 3 of 4
in DO impacts between the current permitted allocation for the City and County and the basin
plan policy -based allocation averages less than 0.05 mg/1 in the critical areas of the estuary
during critical summer conditions. This magnitude of change cannot be field measured
reliably. Therefore, the environmental benefit of applying the basin plan policy over the
proposed allocation appears insignificant.
• The cost of applying the basin plan policy, however, is significant. For the proposed Northside
facility expansion, the estimated cost differential for treatment levels necessary to comply with
each set of limits is approximately $31 million and the total cost for modifications to meet the
current basin plan policy is approximately $64 million.
• The City and County have already reduced overall mass loads allocated to the lower Cape
Fear basin by tying on previously permitted package plants. This includes discharges from the
following package plants:
Monterey Heights Subdivision
Churchill Estates
Walnut Hills Subdivision (will be taken offline within the next 5 years)
North Chase (Bridgeport Subdivision and Smith Creek Estates)
Smith Creek Estates Subdivision
Royal Palms Mobile Home Park
N. C. National Guard Facility
Monterey Heights Subdivision
Hidden Lakes Mobile Home Park (A &B)
Hermitage Rest Home
Coastal Carolina Utilities
Timme Corporation
F&G Development Company
Harbor Acres Subdivision
Millbrook Subdivision
Pine Valley Subdivision
3110- D`tF ui4
Mod? '' :D (1: f i.�� .
f► ,. ` ��
,:,
1 U
V��"
Pirates Cove Subdivision
Landfall
Town of Wrightsville Beach
• Together, these discharges account for over 4 MGD and hundreds of pounds of BOD5 and
NH3N that are not being discharged to more sensitive areas during the summer critical
periods. Stabilizing the permitted mass load allocation provides an incentive for the City and
County to continue providing a regional solution to wastewater collection and treatment. To
this end, the City and County have already reached agreement to extend limited wastewater
services to Pender County.
Additionally, in past communication with the City, DWQ staff have indicated that mixing and
dilution analysis should be performed for the Northside's effluent. Understanding mixing and
dilution is important for establishing limits for parameters in addition to oxygen -demanding wastes
(i.e., toxics and whole -effluent toxicity). Speculative limits for parameters other than BOD5 and
NH3N can be developed using the near field mixing and dilution analyses presented in Chapter 4

Mr. Bill Reid
June 21, 2001
Page 4 of 4
of the modeling report. The minimum dilution in the discharge cell of the model is predicted to be
between 241:1 and 332:1. The immediate dilution (i.e., at maximum plume rise — the point at
which the effluent begins dispersing) above the diffuser is predicted to be between 4.5:1 and
25.4:1. It should be noted that these estimates are conservative in that they assume a single port
diffuser installed in one location. The proposed expansion design would route the parallel pipe
carrying the expanded wasteflow through a second port that is located approximately 150 feet
away from the first port. This should increase dilution by dispersing the total effluent more
quickly.
In summary, the water quality model provided by the City and County to the Division provides a
strong technical basis for establishing speculative permit limits for the proposed expansion of the
Wilmington Northside facility. The model demonstrates that the existing impact on dissolved
oxygen from the aggregate Northside and Southside Wilmington discharges is minimal, and in all
likelihood difficult to even measure. Furthermore, the environmental benefit of reducing the
current permitted load for oxygen demanding wastes to levels reflecting the existing basin plan
policy appears negligible. Given the cost associated with application of the basin policy (both
financial and in terms of lost allocation for future use), maintaining the current permitted loads for
BODS and NH3N (see table on page 2) appears to be more technically and economically
justifiable.
Your consideration of our request is greatly appreciated. We look forward to your response, and
would be glad to discuss any concerns or related matter further. Please do not hesitate to give me
a call. Should you or anyone else with the Division have technical questions regarding the
modeling, we encourage you to contact Mr. Trevor Clements or Mr. Jason Doll of Tetra Tech
Inc. directly at [phone].
Yours very truly,
Hugh Caldwell, P. E.
Director of Public Utilities
cc: Ms. Coleen Sullins, Water Quality Section Chief, DWQ
Mr. Rick Shiver, Regional Supervisor, DWQ Wilmington Regional Office
Mr. Dave Goodrich, NPDES Permit Unit Supervisor, DWQ
Ms. Michelle Woolfolk, Modeling Unit Supervisor, DWQ
Mr. Ken Vogt, P. E., City of Wilmington
Mr. Wyatt Blanchard, P. E., New Hanover County
Mr. Alex Monroe, P. E., McKim & Creed
Mr. Ron Taylor, P. E., Hazen & Sawyer
Mr. Trevor Clements, Tetra Tech
-
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FACT SHEET
INTRODUCTION
ENR / DWQ / NPDES Unit
OR NPDES PERMIT DEVELOPMENT
DES Permit NC0023965
The City of Wilmington, herein called Wilmington or the permittee, requires a National Pollutant
Discharge Elimination System (NPDES) permit to dispose treated wastewater to surface waters of the
state. The permittee's 5-year NPDES permit expired December 31, 2001 and they have requested
permit renewal from the Division of Water Quality (the Division). This Fact Sheet summarizes
background information and rationale used by the Division's NPDES Unit to determine permit limits
and monitoring conditions. This document also contains references to information sources relevant to
this permit renewal (superscripted numbers in order of appearance, see References).
FACILITY RECORDS REVIEW
Facility Description. James A. Loughlin (aka Northside) Wastewater Treatment Plant (WWTP) is a
Class IV, 8.0 MGD publicly owned treatment works (POTW) utilizing a trickling filter system with
advanced secondary treatment for domestic and industrial wastewater (Table 1). The treatment system
utilizes: a mechanical bar screen; grit removal device; dual primary clarifiers; dual trickling filters; an
aeration basin; effluent pump station; chlorine disinfection facilities; a final end -of -pipe effluent defuser
(three each, 11-inch diameter -ID black pipes spread in a 90° arch); sludge pump stations; sludge
thickening facility; anaerobic digesters; de -watering facilities; and solids land application.
Table 1.
Wilmington's James A. Loughlin (Northside) WWTP
Facility Information
Applicant/Facility Name 1,2
City of Wilmington / James A. Loughlin (Northside) WWTP
Applicant Address 1,2
P.O Box 1810 Wilmington , NC 28402
Facility Address 1,2
2311 North 23°1 Street, Wilmington, NC 28401
Permitted Flow (MGD)1'3
8.0
Type of Waste t''-'a
Domestic (99%) and Industrial (1%) process wastewater; Primary SIC
Code 4952; WW Code Prim. 01; Treatment Unit Code 40/08- 0 x 3
Related Permits
Sludge: land application WQ0001271 and WQ0011869
Facility Class / Permit Status 1,2,4
Class IV, Major / Renewal
Drainage Basin / County 1'2
Cape Fear River Basin / New Hanover County
Miscellaneous
Receiving Stream 1,2,4
Cape Fear River
Regional Office
Wilmington
Stream Classification 15
SC
State Grid /
USGS Topo Quad
K 27 NW/
Wilmington, NC
303(d) Listed? 6
No
Permit Writer
Joe R. Corporon
Subbasin 5'7
03-06-17
Date:
26Feb02
Drainage Area (sq. mi.)7
NA
'#
Lat. 34° 14' 27" Long. 77° 57' 10"
Summer 7Q10 (cfs) 7
Tidal
Winter 7Q10 (cfs) 7
Tidal
30Q2 (cfs)
Tidal
Average Flow (cfs) 7
Tidal
IWC(%)7
NA
Fact Slicer
Renem.si -- NPDES Permit NCO023965
Paize 1

Waste Load Allocation (WLA). The Division prepared the last WLA for the receiving stream in
May 1996 and developed effluent limits and monitoring requirements considering discharge under
tidal conditions [in -stream waste concentration (IWC) not readily calculable]. The Division views
these limits and monitoring requirements appropriate for renewal except as discussed below (see
Permitting Approach).
Verifying Existing Stream Conditions. This facility discharges to the Cape Fear River, just
downstream of its confluence with the NE Cape Fear River. Discharge occurs in Class SC waters
located within Subbasin 03-06-17, Cape Fear River Basin.5 Cape Fear Estuary downstream is listed as
"partially supporting" and is generally impaired due to seasonally high concentrations of fecal
coliform bacteria and seasonally low dissolved oxygen (DO). There is also a mercury advisory for
some fish species in the Cape Fear.5
Monitoring data supplied by the Lower Cape Fear River Association (LCFRA) was collected at
sampling stations upstream and downstream from the discharge. Although DO is seasonally low,
levels generally remain above the DO Standard of 5.0 mg/L, typically 11 or 12 mg/L except during
hurricane conditions when DO fell to approximately 1.6 mg/L in September of 1996 (Hurricane Fran)
and September of 1998 (Hurricane Bonnie). In October of 1999 (Hurricane Floyd), the DO low was
measured slightly higher at 2.3 mg/L.
CORRESPONDENCE
Staff Report. Wilmington Regional Office (WiRO) conducted an annual facility inspection and Ed
Beck prepared a Staff Report dated October 25, 2001. WiRO staff found the facility in "very good
condition" and in compliance with the permit. The WiRO recommended that the NPDES Unit renew
the permit.
Division Records and Permittee's Renewal Application. The current permit originally expired on
June 30, 2001 but the Division extended it to December 31, 2001 to stagger the permit renewal
workload by river basin. The Division noted inconsistencies in the 1996 discharge location (Latitude
and Longitude) incorrectly indicating a discharge on Smith Creek, and has corrected these errors for
renewal. A note will be added to the permit cover letter.
Division records include an Authorization to Construct (ATC) issued September 25, 1995. The
Division received the permittee's renewal request (Standard Form A) on July 6, 2001.' In its
application under Potential Facility Changes, Northside stated that future projections include plans to
replace a digester heat -exchanger unit; to install a de -chlorinating unit; and to upgrade to a 16 MGD
biological treatment system including UV disinfection. These intended upgrades are not relevant to
this renewal (see Permitting Approach).
Concerning Renewal Application Supplements. Because the renewal application was received on
06Ju1y01 (before 01 Aug01), the Division has not requested additional Priority Pollutant Analyses
(PPA) from this facility, per agreement with EPA. However, the Division did request the Permittee's
written authorization to provide supplemental analytical data to EPA, per NC/EPA agreement. The
Division forwarded both the data and the Permittee's written authorization to EPA.
Fact Sheet
Renewal -- NPDES NC1H)23965
Page 2

Mercury. Mercury data suggest no reasonable potential to exceed the l/ FAV. 12 Therefore, effluent
monitoring will be discontinued and relegated to the pretreatment program. Furthermore the acute criterion,
1.8 µg/L, is well above the current test -method detection limit of 0.2 µg/L. Therefore, the permittee will not
be required to employ clean -sampling techniques (EPA Method 1631) to document acute impact
compliance. It follows then, that text regarding the future need for Method 1631 has not been added to the
permit cover letter, nor to the effluent conditions page as a footnote, per agreement with the EPA.
Concerning Cyanide: Northside's current data is expressed as "Total Cyanide" while the recommended
acute criterion for cyanide in saltwater is expressed as "Free Cyanide." Therefore, the renewal evaluation of
acute impacts is inconclusive. To provide a database for future RPA, the Division has added Free Cyanide
to the permit. Considering that Total Cyanide was detected in almost 38 % of the reported database (20 of
53 samples), the Division has added a Special Condition to the permit. This will require Wilmington to
evaluate sources, concentrations, and the relationship between "free" and "total" cyanide. Findings,
conclusions, and recommendations for corrective action (if any) shall be submitted to the Division's
NPDES Unit concurrent with the application to renew this permit [see Special Condition A. (3.)].
Ammonia and Dissolved Oxygen (DO). Because of dissolved -oxygen concerns in the estuary described in
the Basin Plan, 5 the Division will continue Weekly effluent DO monitoring. Monitoring for ammonia was
increased from Weekly to 3/Week consistent with Class IV facility requirements. This municipality does
not require ammonia limits. Therefore, the Division will not include a note to the Permittee warning of a
future need for ammonia Weekly Averages, as requested by EPA for this renewal cycle.
Renewal Summary
Effluent Monitoring
• Application: predates 01Aug01, therefore no PPA supplement.
• RPA: conducted to establish acute impacts only (tidal conditions).
• Note Added to Cover Letter: TRC Standard and limit likely at renewal.
• Ammonia: Future Weekly Average limits not required because permit does not have ammonia limits.
• Mercury Method 1631: not required (potential permit limit above current test method ML).
Parameter Changes
Ammonia (NH3 as N)
Increased monitoring to 3/Week
Free Cyanide
Added monitoring 2/Month
Total Cyanide
Increased monitoring to 2/Month
Total Mercury
Discontinued monitoring
Total Copper
Increased monitoring to 2/Month
Total Silver
Increased monitoring to 2/Month
Total Zinc
Added monitoring 2/Month
Instream Monitoring
Previous Requirements:
Changes:
Total Mercury
Dissolved Oxygen (DO)
Temperature
Monitoring Deferred to the Lower Cape Fear River
Basin Association (July 3,1996 under MOA).
No changes recommended.
Fart Sheet
Renewal -- NPDES NC:002 3965
Page 5

COMPLIANCE REVIEW
Discharge Monitoring Reports (DMRs). The Division reviewed up to 52 months of DMR data
(January 1998 through April 2002) depending on the parameter of concern (see Permitting
Approach). Northside's DMRs appear regular, thorough, and complete. Total flow for the time period
January 1999 through December 2001 averaged about 5.77 MGD or about 71 % of permitted
capacity.11
Effluent Chlorine. Wilmington's Northside WWTP monitors Total Residual Chlorine (TRC) daily,
but is currently not restricted by a TRC limit. Furthermore, Northside does not de -chlorinate its
effluent.4 Reported effluent TRC concentrations average less than 700 µg/L over 20 months with
occasional monthly maximums to 2,100 µg/L TRC. 9 In keeping with the Division's policy of not
including TRC limits except for new or expanding discharges, a TRC limit will not be imposed at this
time. However, a note will be added to the cover letter warning of an impending TRC limit to be
added with the adoption of a TRC Standard (in progress).
Instream Monitoring Review. Under Memorandum of Agreement, the Lower Cape Fear River
Association assumed responsibility for instream monitoring, effective July 3, 1996. Subsequently, the
permittee discontinued receiving -stream sampling.
Acute Whole Effluent Toxicity (WET) Test. Quarterly monitoring results for Acute Whole
Effluent Toxicity (WET) testing indicates "pass" for the last 18 quarters (January 1998 through May
2002).
Notices of Violation (NOVs) and Penalty Assessment. Division records for this permit cycle
indicate permit limit violations during January and September of 1999 only. NOVs were issued for
exceeding Weekly Average and Monthly Average fecal coliform limits. No other violations have
been issued.
Pretreatment Compliance. This NPDES permit requires Northside to maintain a Long Term
Monitoring Plan (LTMP) or Pretreatment Program under federal regulations 40CFR 403 and NC
State regulations 15A NCAC 2H.0900. Northside currently services four (4) Significant Industrial
Users (SIUs), Table 2.
Table 2.
Siiznificant Industrial Users (SIUs
-
SIU
INDUSTRY
FLOW
(MGD)
COMMENTS
Corning, Inc.
Fiber Optics
0.0605
Continuous; Corning considers
production data proprietary
Textilease, Inc.
Soiled Laundry
0.0569
Continuous; 30,000 pounds/month (?)
Southern Graphic
Systems, Inc
Printing Cylinders
0.00065
Intermittent; 18 cylinders/ month (?)
AAI International
New
No Information as of Application.
Pao. Sheet
Renewal -- NPDES NC(1023965
Page 3

PERMITTING APPROACH
Dilution under Tidal Conditions. This permit considers discharge to the Cape Fear River estuary, a
receiving stream influenced by wind and ocean tides. Under tidal conditions, stream -flow parameters (7Q10
and 30Q2) are not readily available, therefore previous permits did not include water -quality limited
Weekly Averages. Similarly, past permits have included monitoring only for metals and toxicants, but have
not required limits. The Division assumes that considerable dilution is available to protect against the
chronic impacts of this discharge and notes a positive acute WET Testing history ("pass" for 18 quarters).
However for this renewal, the Division has further evaluated this effluent for the potential acute impacts of
metals and toxicants.
Toxicant Renewal Criteria — Pollutants of Concern (POCs). To establish POCs, the Division reviewed
the permit application, five -and -a -half years of discharge monitoring reports (January 1997 through June
2002), pretreatment data, and the Basin Plan. s The Division employed the standard Reasonable Potential
Analysis (RPA) to calculate a maximum predicted concentration for each POC. Each maximum was
compared to the POC's Final Acute Value (1/2 FAV) for saltwater (Table 3). If by this method, a POC
showed reasonable potential to exceed its V2 FAV, the Division included a permit limit as a Daily
Maximum to protect the receiving stream against potential acute toxic affects. However, current data do
not suggest a need for Daily Maximum limits. Monitoring frequencies were increased to 2/Monthly
appropriate for a Class IV facility according to current Division permitting guidance (15A: 02B.0500 and
supplements). Additional considerations are addressed below.
Table 3.
Northside WWTP -- RPA Review Summary and Renewal Actions
Parameter
Samples
(n)
Hits `
(n)
Maximum
Predicted
V2 FAV
(Saltwater)
RP1
/n _
Comments
Renewal Action
Cadmium
39
0
1.9 pg/L
42.0 µg/L
No
No change to permit
Chromium
39
3
12.7 µg/L
None available
No
No change to permit
Copper
67
66
280.5 µg/L
5.8 µg/L
Yes
Action Level, therefore no limit.
Increased monitoring to
2/Monthly
Total
Cyanide
67
28
85.2 µg/L
None available
No
Remains a POC. Increased
monitoring to 2/Monthly;
no limit
Lead
39
1
2.7 pg/L
221.0 µg/L
No
No change to permit
Mercury
67
3
0.762 µg/L
1.8 µg/L
No
Discontinued Monthly
monitoring.
Nickel
39
1
9.5 µg/L
75.0 µg/L
No
No change to permit
Silver
63
7
11.84 µg/L
1.9 µg/L
Yes
Action Level, therefore no limit.
Increased monitoring to
2/Monthly
Zinc
38
36
179.8 µg/L
95.0 µg/L
Yes
Action Level, therefore no limit.
Added monitoring 2/Monthly
1. RP = data indicate `reasonable potential" to exceed ih FAV.
2. Cyanide -- Recommend V2 FAV (CMC) is 1.0 µg/L expressed as free cyanide. Effluent data are expressed as total cyanide.
TRC. In keeping with the adoption of a new Standard for Total Residual Chlorine (TRC) currently in
progress, the Division will advise this major municipal discharger that a TRC limit will likely be
added at next renewal.
Fact Sheet
Renewal -- Nl'DES NC:0 02 %5
Page 4

PROPOSED SCHEDULE OF ISSUANCE
Draft Permit to Public Notice:
Permit Scheduled to Issue:
July 10, 2002.
October 11, 2002
NPDES UNIT CONTACT
If you have questions regarding any of the above information or on the attached permit, please
contact Joe Corporon [[e-mail]] or call [phone] ext. 597.
NAME: DATE:
REFERENCES
1. 2001. NPDES Permit Application Standard Form A, Wilmington Northside WWTP, received July 6,
2001.
2. 2001. NPDES Regional Staff Report and Recommendations for the Renewal, for Wilmington Northside
WWTP, NPDES Permit No. NC0023965, Wilmington Regional Office, November 5.
3. 2000. Active NPDES Permits List, North Carolina Division of Water Quality, NPDES Unit, on the web
at http:/h2o.enr.state.nc.us/NPDES/NPDESweb.html.
4. 1996. NPDES Permit No.NC0023965. Issued to Wilmington Northside WWTP, expired October 31,
2001 (extended it to December 31, 2001 to stagger the permit renewal workload. Copies obtained
through The Division of Water Quality, Central Files, Archdale Building, 512 N. Salisbury St.,
Raleigh, North Carolina.
5. 2000. Cape Fear Basinwide Water Quality Plan. North Carolina Division of Water Quality, Water
Quality Section, July.
6. 2000. 303(d) List of North Carolina Impaired Waters - Draft. North Carolina Division of Water Quality,
Water Quality Section. Copies obtained through Planning Branch, Archdale Building, 512 N.
Salisbury St., Raleigh, North Carolina.
7. 1996. NPDES Waste Load Allocation Work Sheet, NPDES Permit No. NC0023965 Wilmington
Northside WWTP, (reviewed by Carla Sanderson), June 6.
8. 2001. NPDES Whole Effluent Toxicity Test Results, January 1997 through December 2001, DENR,
Environmental Services Branch, Aquatic Toxicology Unit.
9. 1999-2001. Discharge Monitoring Reports (DMR) for Effluent (DEM Form MR-1), NPDES NC0023965
for Wilmington Northside WWTP.
10. 2002. Personal Communication, Verification of LTMP Data and Laboratory Detection Limits Northside
WWTP, NC0023965, Dolores Bradshaw (City of Wilmington) to Joe Corporon (NPDES Unit),
July 9.
11. 1998-2001. Basinwide Information Management System (BIMS), BIMS Reports, Total Violations
Reported under Limit Violation, Monitoring Violations, and Reporting Violations, for
Wilmington's Northside WWTP, NPDES Permit NC0023965.
12. 1999 National Recommended Water Quality Criteria - Correction, United States Environmental
Protection Agency, Office of Water, #4304, EPA 822-Z-99-001.
Fact Sheet
Renewal -- NPDES NC0023965
Page (

Re: EA status/wilmington exp
Subject: Re: EA status/wilmington exp
Date: Thu, 24 Jan 2002 11:26:52 -0500
From: Milt Rhodes <[e-mail]>
To: Susan A Wilson <[e-mail]>
CC: [e-mail]
An EA was submitted, but was returned and not reviewed as they had not
received a spec. letter yet. Just remind them that after receiving the
spec. letter they should then contact me to proceed with submittal of the
environmental document. It has not been, as I understand it, decided if
this project will require an EA or EIS. Was that talked about the other
day?
Milt
Susan A Wilson wrote:
> Milt - wanted to make sure i put a blurb in wilmington's spec letter
> about the need for ea, etc. where is the division with that one (i
> think you said they had submitted it)? have we submitted comments back
> to them yet? or is it still in review?
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SOC PRIORITY PROJECT: NO
If Yes, SOC No.
To: NPDES Permits Unit
Water Quality Section
Attention: Joe Corporon
(Review Engineer)
Date: October 25, 2001
NPDES STAFF REPORT AND RECOMMENDATION
County: New Hanover
Permit No. NC0023965
PART I - GENERAL INFORMATION
1. Facility and Address:
Northside Wastewater Treatment Plant
City of Wilmington
Public Utilities Department
Post Office Box 1810
Wilmington, North Carolina 28402
2. Date of Investigation: October 11, 2001
3. Report Prepared by: Edward Beck
4. Persons Contacted and Telephone Number:
Ken Vogt, ORC [phone]
5. Directions to Site: The site is located in Wilmington on the
west side 23rd Street approximately 1.7 mile north of the
junction with NC Highway 17.
6. Discharge Point(s), List for all discharge points:
Latitude: 34 14' 27" Longitude: 77 57' 10"
Attach a USGS map extract and indicate treatment facility site and
discharge point on map.
U.S.G.S. Quad No: T52 U.S.G.S. Quad Name: Wilmington
7. Site size and expansion area consistent with application? Yes
8. Topography (relationship to flood plain included): Elevation
approximately 25 feet msl.
9. Location of nearest dwelling: Approximately 1/4 mile

10. Receiving stream or affected surface waters: Cape Fear River
a.
b.
c.
PART II
1. a.
b.
c.
d.
Classification: Class SC
River Basin and Subbasin No.:
Describe receiving stream
downstream uses: The river
commercial and sport fishing
nursery area.
03-06-17
features and pertinent
is used for shipping and
and functions as a primary
- DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
Volume of Wastewater to be permitted: 8.0 MGD
What is the current permitted flow limit? 8.0 MGD
Actual treatment capacity of the current facility? 8 MGD
Date(s) and construction activities allowed by previous
Authorizations to Construct issued in the previous two
years: No ATC in past two years
e. Please provide a description of existing or substantially
constructed wastewater treatment facilities: The system
consists of mechanical bar screen and grit removal units,
dual primary clarifiers, dual trickling filters, an
aeration basin, dual secondary clarifiers, a chlorine
contact basin, an effluent pump station and associated
pumps, tanks, chemical feed, and blowers. Solids handling
systems consist of pump stations for primary and waste
activated sludge, a thickening facility, anaerobic
digesters and gas storage, dewatering facilities and final
disposal by land application.
f. Please provide a description of proposed wastewater
treatment facilities: The permittee is developing plans
for expanding and upgrading the treatment facility.
g•
Possible toxic impacts to surface waters: The city has a
pretreatment program that attempts to limit the toxic
constituents in the wastewater. Chlorine in the effluent
can be toxic.
h. Pretreatment Program (POTWs only): approved
2. Residuals handling and utilization/disposal scheme:
The city holds two permits for sludge treatment and disposal.
Permit number WQ0001271 is for the treatment and disposal of
Class B residuals and Permit number WQ00011869 is for the
further treatment and disposal of Class A residuals.
a. If residuals are being land applied, please specify DWQ
Permit No. WQ0001271 and WQ0011869
Residuals Contractor: Bio Gro Systems, Inc
Telephone No.: [phone]

b. Residuals stabilization: PSRP and PFRP
3. Treatment plant classification (attach completed rating
sheet) : Class IV
4. SIC Code(s): 4952
Wastewater Code(s) Primary: 01 Secondary: 02
Main Treatment Unit Code: 40/08 0 X 3
PART III - OTHER PERTINENT INFORMATION
1. Is this facility being constructed with Construction Grant
Funds or are any public monies (municipals only) involved? NA
2. Special monitoring or limitations (including toxicity)
requests:
3. Important SOC, JOC or Compliance Schedule dates:
4. Alternative Analysis Evaluation: Has the facility evaluated
all of the non -discharge options available? Please provide
regional perspective for each option evaluated.
Spray Irrigation: Conventional spray irrigation is probably
not feasible in this small, highly developed county. Reuse
irrigation may be feasible but this option has not been
explored fully.
Connection to Regional Sewer System: Wilmington operates the
largest treatment facilities in the region.
Subsurface: Not feasible for such a large system.
5. Other Special Items:
PART IV - EVALUATION AND RECOMMENDATIONS
The city's advanced secondary treatment facility is very well
operated and produces an effluent quality that is consistently well
within compliance with the current effluent limits. The facility
needs to be expanded to meet the needs of a growing population in
the city and county. The City and County are cooperating to
provide collection and treatment services for much of the
population in the county. Speculative effluent limits based on the
management strategy in the basin plan have been provided by the
Division of Water Quality for a proposed expansion of the Northside
Treatment Facility. The City questioned the need for stringent
effluent limits and employed a consulting firm to model the
assimilative capacity of the river and the impact of the Northside
outfall. This submittal is currently being evaluated by the
Division. The preliminary design of the expanded treatment system
appears to be capable of providing a high degree of treatment,
producing an effluent that could meet stringent effluent limits.

It is recommended that the permit be reissued for a period of
five years with no change in effluent limits and monitoring
requirements. Instream monitoring is being done by the Cape Fear
River Program. Modification of the permit will be necessary in the
near future to accommodate the proposed expansion.
a/z.E2 g.be/4--
Signature of Report Preparer
/0-02 C/
Date
Water Quality Regional Supervisor Date
cc: Wilmington Regional Office
Central Files

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CITY OF WILMINGTON
PUBLIC UTILITIES DEPARTMENT
July 2, 2001
Ms. Valery Stephens
Division of Water Quality- Point Source Branch
1617 Mail Service Center
Raleigh, NC 27699-1617
P.O.Box 1810
WILMINGTON, NC 28402
TDD [phone]
rojEcEllwEiN
Lll JUL 6 2001 Lij
DENR-WATER QUALITY
POINT SOURCE BRANCH
Re: NPDES Permit Renewal Application Package
Permit Number NC0023965- Northside Wastewater Treatment Plant
Dear Ms. Stephens:
Enclosed is an application for renewal of NPDES Permit number NC0023965. This is
for Wilmington's Northside Wastewater Treatment Plant.
We hope that this submittal meets all the requirements to have renewals issued before the
December 31, 2001 expiration date of the existing permits. If you have any questions, please
contact me at [phone].
Yours very truly,
Hugh T. Caldwell, P.E.
Director of Public Utilities
Enclosures
cc: Kenneth L. Vogt, Jr., P.E., Superintendent of Wastewater Treatment
ADMINISTRATION ENVIRONMENTAL SERVICES UTILITY SERVICES WASTEWATER TREATMENT WATER TREATMENT
VOICE [phone] VoscE [phone] VOCE [phone] LOUGHLIN PLANT MAFFTrT PLANT VOcE [phone]
FAX [phone] Fax [phone] FAX [phone] VotcE [phone] VOICE [phone] FAx [phone]
FAX [phone]

4.
NC DENR / DWQ / NPDES PERMIT APPLICATION -
Municipal Facilities with permitted flows > 1 MGD or with pr
N. C. Department of Environment and Natural
Division of Water Quality / NPDES Uni
1617 Mail Service Center, Raleigh, NC 2769
SECTION 1. APPLICATION AND FACILITY D
Unless otherwise specified on this form all items are to be completed. if an item is not applicab
TANDARD
*mi `� tbro
L,41urces
7 JUL 6 2001
North Carolina NPDES Permit Number NC00 23965
R QUALITY
CE BRANCH
(if known)
1. Applicant and facility producing discharge
This applies to the person, agency, firm, municipality, or any other entity that owns or is responsible for the permitted facility. This may or may not
be the same name as the facility or activity producing the discharge. Enter the name of the applicant as it is officially or legally referred to; do not
use colloquial names as a substitute for the official name.
Name of applicant / permittee: Hugh T. Caldwell, P.E., City of Wilmington
Mailing address:
Street address P.O. Box 1810
City Wilmington
State NC
County New Hanover
Zip Code 28402
Telephone Number ( 910 ) 341-7805
Fax Number ( 910 ) 341-5881
e-mail address
hugh.caldwell ci.wilmington.nc.us
2. Mailing address of applicant's Authorized Agent / Representative:
Complete this section if an outside consulting firm/ engineering firm will act on behalf of the applicant / permittee
Engineer / Company name
Street address
City County
State Zip Code
Telephone Number ( )
Fax Number ( )
e-mail address
1 certify that I am familiar with the information contained in this application and that to the best of my knowledge and belief such
information is true, complete, and accurate.
Hugh T. Caldwell, P.E. Director of Public Utilities
Printed Name of Person Signing Title
7Signature pplicant or Authorized Agent D Application Signed
North Carolina General Statue 143-215.6 (b)(2) provides that: Any person who knowingly makes any false statement representation, or certification in any application,
record, report, plan, or other document files or required to be maintained under Article 21 or regulations of the Environmental Management Commission implementing that
Article, or who falsifies, tampers with, or knowingly renders inaccurate any recording or monitoring device or method required to be operated or maintained under Article 21
or regulations of the Environmental Management Commission implementing that Article, shall be guilty of a misdemeanor punishable by a fine not to exceed $10,000, or by
imprisonment not to exceed six months, or by both. (18 U.S.C. Section 1001 provides a punishment by a fine or not more than $10,000 or imprisonment not more than 5
years, or both, for a similar offense.)
1 of 7

NC DENR / DWQ / NPDES PERMIT APPLICATION - STANDARD FORM A
Municipal Facilities with permitted flows > 1 MGD or with pretreatment programs
3. Permitted Facility Location:
Give the physical location of the facility where discharge(s) presently occur(s) or will occur.
Street address 2311 North 23`d Street
City Wilmington County New Hanover
State NC Zip Code 28401
Telephone Number ( 910 ) 341-7890
Fax Number ( 910 ) 341-4659
e-mail address ken.vogtaci.wilminaton.nc.us
4. Municipalities or Areas Served (see instructions
Enter the names of the municipalities or areas served by this facility. For each municipality enter the best estimate of actual population served at
the time of this application.
Actual Population Served
City of Wilmington
29,644
New Hanover County
43,955
Total Population Served
73,599
5. Average Daily Industrial Flow
Total estimated average daily flow from all industrial sources:
0.200 MGD
Total permitted monthly flow from all industrial sources: 0.1185 MGD
Note: All Significant Industrial Users (as defined in Section ill) discharging to the municipal system must be listed in Section ill.
6. Facility Description
• Present Operating Status: Provide a narrative description of installed wastewater treatment components at the facility.
Include sizes & capacities for each component.
• Potential Facility Changes: Provide a narrative description of any planned upgrades / expansions / repairs planned for the
facility during the next five years. Do not include tasks associated with routine operation & maintenance.
• Schematic of wastewater flow: A line drawing of water flow through the facility must be attached to this application. The
schematic should show flow volumes at all points in the treatment process. Specific treatment components should be
identified.
• Location map: A map showing the location of each outfall must be attached to this application. The usual meridian arrow
showing north as well as the map scale must be shown. On all maps of rivers, the direction of the current is to be indicted by
an arrow. In tidal waters, the directions of the ebb and flow tides are to be shown. All outfalis should be identified with the
outfall number(s) used in Section II of this application. A copy of the relevant portion of a USGS topographic map is preferred.
All sheets should be approximately letter size with margins suitable for filing and binding. All pages should include facility location
and permit number (if available).
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2 of 7

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0 1000 2000 4000
SCALE 1" = 2000'
Figure 2. Topographic map. Area located within Wilmington and
Castle Hayne quads.
Northside Wastewater Treatment Plant
New Hanover County, NC

NC DENR / DWQ / NPDES PERMIT APPLICATION - STANDARD FORM A
Municipal Facilities with permitted flows > 1 MGD or with pretreatment programs
SECTION 11. BASIC DISCHARGE DESCRIPTION
Complete this section for each present (or proposed) discharge indicated in Section I.
All values for an existing discharge should be representative of the twelve previous months of operation.
(lf this is a proposed discharge, values should reflect best engineering estimates.)
1. Facility Discharges, Number and Discharge Volume
Specify the number of discharges described in this application and the volume of water discharged or lost to each of the categories below.
Estimate average volume per day in MGD. Do not include intermittent discharges, overflows, bypasses or seasonal discharges from lagoons, etc.
Discharge To: Number of Discharge Points Total Volume Discharged (MGD)
Surface Water
1
8.0
Other (describe below)
TOTAL
1
8.0
If `other' is specified, describe:
2. Outfall Number: 001
Assign a three -digit number beginning with 001 for the point of discharge covered by the first description. Discharge serial numbers should be
consecutive for each additional discharge described; hence, the second serial number should be 002 , the third 003, etc.
3. Discharge to End Date
If the discharge is scheduled to cease within the next 5 years, give the date (within best estimate) the discharge will end: N/A
Give the reason(s) for discontinuing this discharge in your cover letter.
4. Receiving Stream Name
Give the name of the waterway (at the point of discharge) by which it is usually designated on published maps of the area. If the discharge is to an
unnamed tributary, so state and give the name of the first body of water fed by that tributary which is named on the map, e.g., UT to McIntire Creek,
where McIntire Creek is the first water way that is named on the map and is reached by the discharge.
Cape Fear River
5. Outfall Structure
Describe the outfall structure and any significant changes since the last permit was issued (repairs, shoreline maintenance, etc.).
30" pipe reduced to 18" three -port diffuser
3 of 7

Northside WWTP
2311 North 23rd Street
Wilmington, NC 28401
NC0023965
6. Facility Description
PRESENT OPERATING STATUS:
The James A. Loughlin Wastewater Treatment Plant (Northside WWTP), owned
and operated by the City of Wilmington, currently provides wastewater treatment
for a design average flow of 8 million gallons per day (mgd). The Northside
WWTP serves the northern portion of the City of Wilmington and surrounding
areas of New Hanover County. Wastewater from the system is collected in
pumping stations throughout the City and County. Influent wastewater from the
City's force main enters the plant through bar screen and grit removal facilities.
The County has a separate force main that enters the plant downstream of the
screenings and grit removal facilities at the primary clarifier distribution box. The
primary clarifier distribution box splits flow to two treatment trains consisting of
one clarifier and trickling filter in each train. Each train is rated at 4 mgd. The
two primary clarifiers are provided to remove a portion of the influent BOD5 and
suspended solids in order to reduce the organic loading on the biological
treatment system. Primary clarifier effluent flows to the two 160' diameter
trickling filters with rock media to provide a fixed film biological treatment of the
wastewater. Effluent from the trickling filters is combined in the trickling filter
recirculation pump station. Effluent from the trickling filters in excess of the
recirculated flow enters the intermediate pump station and is pumped to the
aeration basin. The aeration basin uses a coarse bubble diffused air aeration
system to provide additional biological treatment. The aeration basin provides an
aerated detention time of 2.5 hours at the design flow. Blowers located in the
adjacent blower building supply air to the diffuser system. Effluent from the
aeration basin flows to a splitter box that divides the flow to two secondary
clarifiers. In the secondary clarifiers activated sludge settles for return to the
aeration tank. Return activated sludge from the underflow of the secondary
clarifiers flows by gravity to the intermediate pump station where it is combined
with the trickling filter effluent and pumped to the aeration basin. Clear liquid
above the settling solids overflows the effluent weirs and flows to the flash mix
chamber and chlorine contact basin. Secondary clarifier effluent in the chlorine
contact basin is disinfected by the addition of chlorine solution for the reduction of
disease -causing bacteria. Effluent from the chlorine contact tank flows to the
effluent pump station wet well and is pumped through the effluent force main to
the discharge point at the Cape Fear River.
Primary sludge is pumped directly to anaerobic digestion. Secondary sludge is
pumped to the sludge thickening facility and thickened on a single gravity belt
thickener. Thickened sludge is pumped to a TVVAS storage tank and is then
pumped to anaerobic digestion for stabilization. Anaerobic digestion is a three -
tank series operation. Stabilized sludge is pumped from the digesters to a
digested sludge storage tank for equalization prior to being dewatered on the belt

Northside WWTP
2311 North 23rd Street
Wilmington, NC 28401
NC0023965
filter presses in the sludge facility. Dewatered cake solids from the belt filter
presses are disposed of off -site. Residuals from the Northside WWTP and the
Sweeney Water Treatment Plant are processed through the Northside belt filter
presses, segregated, and transported separately to Southside WWTP for
subsequent blending with Southside WWTP residuals to produce one Class B
residual product. Solids meeting Class B stabilization criteria are land applied in
a five -county area consistent with permit number WQ0001271. The City has
alkaline stabilization facilities at the Southside WWTP where cake solids can be
mixed with an alkaline material for further stabilization to Class A criteria before
eventual disposal consistent with permit WQ0011869.
The current NPDES permit for the Northside plant allows the discharge of 8 mgd
with a BOD5 concentration of 30 mg/I and a total suspended solids (TSS)
concentration of 30 mg/I. Northside historical performance data were analyzed
for the period from July 1996 to June 1999. Over the period effluent BOD5
concentrations averaged 15 mg/I and effluent TSS concentrations averaged 5
mg/I.
NORTHSIDE WVVTP
DESIGN DATA
8 MGD DESIGN CAPACITY
Bar Screens
Number of mechanical screens 1
Clear opening between bars 3/8 inch
Number of manual bar racks 1
Clear opening between bars 1 inch
Grit Collector
Number 1
Rated capacity of each unit 10.5 mgd
Field performance capacity (each) 7.0 mgd
Type Detritor
Diameter 16 ft
Grit Classifier
Number
Type
1
Reciprocating Rake
Primary Clarifiers
Number 2
Type Circular, center feed
Diameter 85 ft

Northside WWTP
2311 North 23rd Street
Wilmington, NC 28401
NC0023965
Blowers
Number
Type
Capacity of each blower
Horsepower
Final Clarifiers
Number
Type
Diameter
Surface area, each
Total surface area
Surface overflow rate at design flow
Sidewater depth
Total volume
Detention time at design flow
Type of solids removal system
Scum Pumps
Number
Type
Maximum capacity of each pump
Horsepower
Chlorine Contact Tanks
Number
Length x Width x SWD
Volume of tank
Chlorinators
Number
Capacity
Effluent Pumps
Number
Capacity
Total Dynamic Head
Horsepower
Number
Capacity
Total Dynamic Head
Horsepower
2
Centrifugal
5,000 scfm
300
2
Circular, center feed
90 ft
6,350 ft2
12,700 ft2
630 gpolft2
16 ft.
1.5 million gal
4.5 hr
Scrapers
2
Piston
30 gpm
2
1 (Three -pass)
56'x34'x8'
106,600 gal
2
1 @ 1000 lb/day
1 @ 500 lb/day
3
3,500 gpm
86 ft
125
2
2,100 gpm
86 ft
75

Northside WWTP
2311 North 23'1 Street
Wilmington, NC 28401
NC0023965
Surface area, each
Total surface area
Surface overflow rate at design flow
Sidewater depth
Volume of each tank
Total volume
Detention time at design flow
Trickling Filters
Number
Diameter
Depth of stone
Surface area, each
Total surface area
Hydraulic loading rate
Organic loading rate
Recirculation Pumps
Number
Type
Capacity
Total dynamic head
Horsepower
Intermediate Pumps
Number
Type
Capacity
Total dynamic head
Horsepower
Aeration Tanks
Number
Length
Width
Depth
Volume
Detention time at design flow
Type of aeration
Number of diffusers
Maximum airflow per diffuser
5,675 ft2
11,350 ft2
705 gpd/ft2
12ft
0.60 million gal
1.21 million gal
3.63 hr
2
160 ft
5.25 ft
20,100 ft2
40,200 ft2
0.138 gpm/ft2
224 Ib/day/1000 ft3
3
Vertical Turbine
2,800 gpm
15'
20
3
Submersible
6,200 gpm
34 ft
105
1
115 ft
54 ft
16.8ft
0.780 million gal
2.3 hr
Coarse bubble diffused air
208
24 cfm

Northside WWTP
2311 North 231d Street
Wilmington, NC 28401
NC0023965
Effluent Flow Measurement
Type
Diameter
Magnetic Flowmeter
24 in
Primary Sludge Pumps
Number 2
Type Piston
Capacity of each pump 90 gpm
Total dynamic head 200 ft
Horsepower 10
Number 2
Type Piston
Capacity of each pump 100 gpm
Total dynamic head 60 ft
Horsepower 5
Waste Activated Sludge Pumps
Number 3
Type Centrifugal
Capacity 300 gpm
Total Dynamic Head 17 ft
Horsepower 10
WAS Gravity Belt Thickener
Number 1
Belt width 2 meters
Maximum feed rate per thickener 350 gpm
GBT Polymer System
Type Dry, Manual Mix
No. of Tanks 2
Capacity per Tank 675 gal
Thickened Waste Activated Sludge Pumps
Number 2
Type Piston
Capacity 100 gpm
Horsepower 10
Thickened Waste Activated Sludge Storage Tank
Number 1
Length x Width x SWD 17.5' x 17.5' x 14'
Volume 32,000 gal

Northside WWTP
2311 North 23rd Street
Wilmington, NC 28401
NC0023965
Type of Mixer
Thickened Waste Activated Sludge Transfer Pump
Number
Type
Capacity
Horsepower
Anaerobic Digesters
Number
Diameter
Maximum sidewater depth
Volume, each
Total Volume
Mixing System Type
No. of mixers, per tank
Digester Recirculation Pumps
Number
Type
Capacity
Horsepower
Number
Type
Capacity
Horsepower
Number
Type
Capacity
Horsepower
Digester Transfer Pump
Number
Type
Capacity
Horsepower
Gas Holder
Number
Diameter
Storage volume
Sludge Heat Exchangers
Number
Mechanical
1
Progressive Cavity
32 gpm
3
3
60 ft
18ft
381,000 gal
1.14 million gal
Cannons
6
1
Centrifugal
500 gpm
15
1
Centrifugal
400 gpm
15
1
Centrifugal
300 gpm
7.5
1
Centrifugal
700 gpm
60
1
50 ft
38,500 ft3
2

Northside WWTP
2311 North 2314 Street
Wilmington, NC 28401
NC0023965
Capacity
Number
Capacity
Alum/Digested Sludge Storage Tanks
Number
Length x Width x SWD
Volume,each
Type of Mixer
Belt Filter Press Feed Pumps
Number
Type
Capacity
Horsepower
Number
Type
Capacity
Horsepower
Belt Filter Presses
Number
Belt width per press
Maximum Solids loading rate per press
BFP Polymer Systems
Number of tanks
Volume of each tank
Number of dry polymer preparation systems.
Number of Polymer dilution/ feed systems
Filtrate Pumps
Number
Type
Capacity
Standby Generator
Capacity
Voltage
Fuel Tank
375,000 BTU
1
1,000,000 BTU
2
17.5' x 17.5' x 22'
60,000 gal
Mechanical
2
Progressive Cavity
300 gpm
20
1
Rotary Lobe
140 gpm
10
2
2 meters
2,500 lb./hr.
2
1000 gal
2
2
3
Centrifugal, submersible
300 gpm
1275 kW
4160 V
6000 gal

PLOT PATE 04/19/00 4:07pm ALE= H:\30374\NORTHSIDE\FICURES\001 by PTLAWANSON XREF FILE = NONE
CITY
CLARIFIER
DISTRIBUTION
BOX
COUNTY
INFLUENT
WASTEWATER
BAR SCREENS/
GRIT REMOVAL
FACILITY
INFLUENT
WASTEWATER
c—
PS
PRIMARY
CLARIFIER
PRIMARY
CLARIFIER
Q
c >
TRICKUNG
FILTER
TRICKUNG
FILTER
TRICKUNG FILTER
PS RECIRCULATION
CLARIFIER
SPUTTER
BOX
RECIRCULATION
PUMP STATION
INTERMEDIATE
PUMP STATION
AERATION
TANK
RAS
SECONDARY
CLARIFIER
SECONDARY
CLARIFIER
RAS
RAS
T
PS
PRIMARY SLUDGE
PUMP STATION
P5
ANAEROBIC
DIGESTER
PRIMARY
SLUDGE
PUMP
STATION
NORTHSIDE WWTP
2311 NORTH 23RD STREET
WILMINGTON, NC 28401
NC0023965
� a
ANAEROBIC
DIGESTER
DIGESTER
BUILDING
ANAEROBIC
DIGESTER
TWAS
TWAS
STORAGE
TANK
THICKENING
FACIUTY
DIGESTED
SLUDGE
STORAGE TANK
DIGESTER
GAS STORAGE
ALUM SLUDGE
FROM WATER PLANT
ALUM SLUDGE
STORAGE TANK
4
DEWATERING
FACILITY
WAS
—FLASH
MIXER
Box
CHLORINE
CONTACT
BASIN
EFFLUENT
PUMP
STATION
CAPE
FEAR
RIVER
WAS PUMP
STATION • •.'•
OFF -SITE
SLUDGE
DISPOSAL
CITY OF WILMINGTON
NORTHSIDE WASTEWATER TREATMENT PLANT

NC DENR / DWQ / NPDES PERMIT APPLICATION • STANDARD FORM A
Municipal Facilities with permitted flows > 1 MGD or with pretreatment programs
SECTION 111. INDUSTRIAL WASTE CONTRIBUTION TO MUNICIPAL SYSTEM
Submit a separate Section 111 for each Significant Industrial User.
1. Significant Industrial User (SIU)
An SIU has (or could have) significant impact on the POTW receiving the wastewater or upon the quality of effluent from the receiving POTW.
Specifically, an SIU:
• has a flow of 50,000 gallons or more per average workday;
• has a flow greater than 5 percent of the total flow carried by the municipal system m receiving the waste, or
• has a toxic material in its discharge.
It may be necessary to alter these administrative criteria in certain cases, such as an instance where two or more contributing industries in
combination can produce an undesirable effect on either the municipal facility or the quality of its effluent.
Name of SIU Corning, Inc.
Street address 310 N. College Road
City Wilmington County New Hanover
State NC Zip Code 28405
Telephone Number ( 910 ) 395-7343
Fax Number ( 910 ) 799-6411
e-mail address
andersonad(corning.com
2. Primary Product or Raw Material
Specify either the principal product or the principal raw material and the maximum quantity per day produced or consumed.
Quantities are to be reported in the units of measurement for each SIC category at the facility. SIC categories should use the units of
measurement normally used by that industry.
Product
Raw Material
Quantity
Units
Fiber Optics
*
*
*
* Coming considers this information proprietary and does not release it in a public application.
3. Flow
Indicate the volume of water discharged into the POTW and whether this discharge is intermittent or continuous
.0605 MGD
Intermittent XX Continuous
4 of 7

v
NC DENR / DWQ / NPDES PERMIT APPLICATION - STANDARD FORM A
Municipal Facilities with permitted flows > 1 MGD or with pretreatment programs
SECTION III. INDUSTRIAL WASTE CONTRIBUTION TO MUNICIPAL SYSTEM
Submit a separate Section 1!! for each Significant industrial User.
1. Significant Industrial User (SIU)
An SIU has (or could have) significant impact on the POTW receiving the wastewater or upon the quality of effluent from the receiving POTW.
Specifically, an SIU:
• has a flow of 50,000 gallons or more per average workday;
• has a flow greater than 5 percent of the total flow carried by the municipal system m receiving the waste, or
• has a toxic material in its discharge.
It may be necessary to alter these administrative criteria in certain cases, such as an instance where two or more contributing industries in
combination can produce an undesirable effect on either the municipal facility or the quality of its effluent.
Name of SIU Textilease, Inc.
Street address
1821 Dawson Street
City Wilmington
State NC
County New Hanover
Zip Code 28405
Telephone Number ( 910 ) 763-0184
Fax Number ( 910 ) 763-0243
e-mail address
hellington ar_textilease.com
2. Primary Product or Raw Material
Specify either the principal product or the principal raw material and the maximum quantity per day produced or consumed.
Quantities are to be reported in the units of measurement for each SIC category at the facility. SIC categories should use the units of
measurement normally used by that industry.
Product
Raw Material
Quantity
Units
Soiled laundry
30,000
pounds
3. Flow
Indicate the volume of water discharged into the POTW and whether this discharge is intermittent or continuous
.0569 MGD ❑ Intermittent XX Continuous
5 of 7

NC DENR / DWQ / NPDES PERMIT APPLICATION - STANDARD FORM A
Municipal Facilities with permitted flows > 1 MGD or with pretreatment programs
SECTION 111. INDUSTRIAL WASTE CONTRIBUTION TO MUNICIPAL SYSTEM
Submit a separate Section Il! for each Significant Industrial User.
1. Significant Industrial User (SIU)
An SIU has (or could have) significant impact on the POTW receiving the wastewater or upon the quality of effluent from the receiving POTW.
Specifically, an SIU:
• has a flow of 50,000 gallons or more per average workday;
• has a flow greater than 5 percent of the total flow carried by the municipal system m receiving the waste, or
• has a toxic material in its discharge.
It may be necessary to alter these administrative criteria in certain cases, such as an instance where two or more contributing industries in
combination can produce an undesirable effect on either the municipal facility or the quality of Rs effluent.
Name of SIU Southern Graphic Systems. Inc.
Street address 2406 N. 23`d Street
City Wilmington County New Hanover
State NC Zip Code 28405
Telephone Number ( 910 ) 762-6270
Fax Number ( 910 ) 251-9132
e-mail address emhowardesgsintl.com
2. Primary Product or Raw Material
Specify either the principal product or the principal raw material and the maximum quantity per day produced or consumed.
Quantities are to be reported in the units of measurement for each SIC category at the facility. SIC categories should use the units of
measurement normally used by that industry.
Product
Raw Material
Quantity
Units
Printing Cylinders
18
cylinders
3. Flow
Indicate the volume of water discharged into the POTW and whether this discharge is intermittent or continuous
.00064 MGD
XX Intermittent ❑ Continuous
6 of 7

NC DENR / DWQ / NPDES PERMIT APPLICATION - STANDARD FORM A
Municipal Facilities with permitted flows > 1 MGD or with pretreatment programs
SECTION 1I1. INDUSTRIAL WASTE CONTRIBUTION TO MUNICIPAL SYSTEM
Submit a separate Section 111 for each Significant industrial User.
1. Significant Industrial User (SIU)
An SIU has (or could have) significant impact on the POTW receiving the wastewater or upon the quality of effluent from the receiving POTW.
Specifically, an SIU:
• has a flow of 50,000 gallons or more per average workday;
• has a flow greater than 5 percent of the total flow carried by the municipal system m receiving the waste, or
• has a toxic material in its discharge.
It may be necessary to alter these administrative criteria in certain cases, such as an instance where two or more contributing industries in
combination can produce an undesirable effect on either the municipal facility or the quality of its effluent.
Name of SIU AAI International
Street address 1726 N. 23`d Street
City Wilmington County New Hanover
State NC Zip Code 28405
Telephone Number
Fax Number
e-mail address
( 910
( 910
763-4536
815-2300
Iarry.ferrelk aaipharma.com
2. Primary Product or Raw Material
Specify either the principal product or the principal raw material and the maximum quantity per day produced or consumed.
Quantities are to be reported in the units of measurement for each SIC category at the facility. SIC categories should use the units of
measurement normally used by that industry.
Product
Raw Material
Quantity
Units
No information yet- currently permitted,
but no discharge data till July 2001
3. Flow
Indicate the volume of water discharged into the POTW and whether this discharge is intermittent or continuous
.0005 MGD (permitted) Intermittent
XX Continuous
7 of 7

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