NC0002879_Permit (Issuance)_20020116

i
NPDES DOCUMENT SCANNINS; COVER SHEET
NPDES Permit: NC0002879
Sweeney WTP
Document Type: Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Correspondence
201 Facilities Plan
Instream Assessment (67B)
Environmental Assessment (EA)
Permit
History
Document Date: January 16, 2002
qr%&M d t ILM printed oa reuse paper-ignore.any
oauteut Qa the rewe uaide

OF wArF9 Michael F. Easley
Governor
William G. Ross,Jr., Secretary
j NCDENR North Carolina Department of Environment and Natural Resources
—i
Gregory J.Thorpe, Ph.D., Acting Director
Division of Water Quality
January 16, 2002
Mr. Hugh Caldwell
Director of Pubic Utilities
City of Wilmington
P.O. Box 1810
Wilmington,North Carolina 28402
Subject:Issuance of NPDES Permit NCO002879
Sweeney WTP
New Hanover County
Dear Mr. Caldwell:
Division personnel have reviewed and approved your application For renewal of the subject permit.
Accordingly,we are forwarding the attached NPDES discharge permit. This permit is issued pursuant to the
requirements of North Carolina General Statute 143-215.1 and the Memorandum of Agreement between North
Carolina and the U.S. Environmental Protection Agency dated May 9, 1994 (or as subsequently amended).
This final permit includes no major changes from the draft permit sent to you on November 14, 2001.
If any parts, measurement frequencies or sampling requirements contained in this permit are unacceptable to
you, you have the right to an adjudicatory hearing upon written request within thirty (30) days following receipt of
this letter. This request must be in the form of a written petition, conforming to Chapter 150B of the North Carolina
General Statutes, and filed with the Office of Administrative Hearings (6714 \fail Service Center, Raleigh, North
Carolina 27699-6714). Unless such demand is made, this decision shall be final and binding.
Please note that this permit is not transferable except after notice to the Division. The Division may require
modification or revocation and reissuance of the permit. This permit does not affect the legal requirements to obtain
other permits which may be required by the Division of Water Quality or permits required by the Division of Land
Resources, the Coastal Area LNlanagement Act or any other Federal or Local governmental permit that may be
required.
If you have any questions concerning this permit,please contact Charles Weaver at telephone number (919)
733-5083, extension 511.
Sincerely,
ORIGINAL SIGNED BY
SUSAN A. OLSON
Gregory J.Thorpe,Ph.D.
cc: Central Files
`�ilmington R_egional Office/Water Quality Section
1�3PDES Unit
N.C.Division of Water Quality 1 NPOES Unit Phone:[phone]
1617 Mail Service Center,Raleigh,NC 27699-1617 fax:[phone]
Internet:h2o.enr.state.nc.us DENR Customer Service Center.1800 623-7748

Permit NC0002879
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provision of North Carolina General Statute 143-215.1, other lawful
standards and regulations promulgated and adopted by the North Carolina Environmental
Management Commission, and the Federal Water Pollution Control Act, as amended, the
City of Wilmington
is hereby authorized to discharge wastewater from a facility located at the
Sweeney WTP
407 Hilton Street
Wilmington
New Hanover County
to receiving waters designated as the Northeast Cape Fear River in the Cape Fear
River Basin in accordance with effluent limitations, monitoring requirements, and
other conditions set forth in Parts I, II, III and IV hereof.
This permit shall become effective March 1, 2002.
This permit and authorization to discharge shall expire at midnight on December 31, 2006.
Signed this day January 16, 2002.
ORIGINAL SIGNED BY
31 IRAN A yVILSGN
Gregory J. Thorpe, Ph.D., Acting Director
Division of Water Quality
By Authority of the Environmental Management Commission

Permit NC0002879
SUPPLEMENT TO PERMIT COVER SHEET
The City of Wilmington is hereby authorized to:
1. Continue to operate a drinking-water treatment plant with a discharge of filter-
backwash wastewater. This facility is located on Hilton Street in Wilmington at
the Sweeney WTP in New Hanover County.
2. Discharge from said treatment works at the location specified on the attached
map into the Northeast Cape Fear River, classified SC-Swamp waters in the Cape
Fear River Basin.

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stream Class:sc-swamp Sweeney W"
30617

Permit NC0002879
A. (I.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
During the period beginning on the effective date of this permit and lasting until expiration, the Permittee is
authorized to discharge filter backwash from outfall 001. Such discharges shall be limited and monitored by
the Permittee as speciiled below:
EFFLUENT LIMITS MONITORING REQUIREMENTS
CHARACTERISTICS
Monthly: Daily Measurement Sample Type Sample Location
Average Maximum Frequency
Flow Weekly Instantaneous Effluent
Total Suspended Solids 30.0 mglL 45.0 mglL 21Month Grab Effluent
Settleable Solids 0.1 mVL 0.2 mVL Weekly Grab Effluent
Iron . Weekly Grab Effluent
Total Residual Chlorine Weekly Grab Effluent
Aluminum Weekly Grab Effluent
All samples collected should be from a representative discharge event.
There shall be no discharge of floating solids or visible foam in other than trace amounts.

l
AFFIDAVIT OF PUBLICATION ,fly
STATE OF NORTH CAROLINA
COUNTY OF NEW HANOVER
tiST Too NOTICE Before the undersigned,a Notary Public of Said County and State,
NORTH CAROIINA
ENWRONNENT4
MANAGEMENT D1ANE P-KEENAN
COMWS91ONlNPOES UNIT
1617 Mail Service Cente,
Ralnp R,NC 27699.1617
AlOnI'ICAnON aF iNrENT Who,being duly sworn or affirmed,according to the law,says that hUshe is
TO ISSUE A NPDES
WASTEWATER PERMIT
On the basis of thomuafi CLASSIFIED ADVERTISING MANAGER
stag review fend epplot*
mn d NC General stat-
ute 1.3 21,Public law s7. of THE WILMINGTON STAR-NEWS,INC.,a corporation organized and doing business under
Soo am Othe' Iawr Vl
—writes fend rcgw.- the Laws of the State of North Carolina,and publishing a newspaper known as WILMINGTON
Elons.M eat. m nantealce: MORNING STAR&SUNDAY STAR-NEWS in the City of Wilmington
tight Commission Pro-
%posles to issue a Natidnal PUBLIC NOTICE STATE OF NORTB CAROLINA ENVIRONMENTAL MANAGEME,VT
Pollutant plsch.rge
EDiniriatisin system CO,i MISS1ONGVPDES UNIT 1617 Mai!Sr"ire Center Raleigh,NC 27699.1617
[h.N.,esPeni L W In,er pr;- NOTIFICATION OF INTENT TO ISSUE A NPDES WASTEWATER PERMIT Ore the basis
wsr`' , tv" tfe .5 my tmhe of thorough staff"view and application pf NC
weiksh date d this no
tfce.
-Wnrten cdmmenls m-
19aNung me pmWsed
pennrt ip fee aC[eoted
until 30 days after the
rl AA C'mmemnis m was inserted in the aforesaid newspaper in space,and en dates as follows:
ceivf:d one to that date
am considered in u efinal
determinations rc9erdlrg L11/I7,1
ttme proposed permit,THr
DrKlor of the NC Oivi.
don of water W.1ity may
ecide to WIC a W06c
meeurmq Ins the pmprad
Peron[ should the Doi. And ai the time of such publication Wilmington Star-NcwS was a newspaper meeting all the
loanrmceve a sgrv6caN requirements and ualifications prescribed h Sec.No,1-597 G.S.of N.C.
desires,iff moi aaerest. 9 9 P Y 11
s of the hi.
ff.a
�nC oMero pport�ng ' ,`/[`((7•!/caf/////'y` •a'S.al.//C'(A��
rormatmpn ale d to
1 p`seMnM me dr�Nti M�
bat are available upon Title:CLASSIFIED ADVER.MGR
1 NA-It pettaobaf rem9d�ucti. Sworn or affirmed to.and subscribed before me this 21 s[ day of
No u m rent and1o, NOVE"ER A D 2001.
rc9uests Ion i f—At—
m ume NC Division o1 Wa-
ter O."bly at the abp In Testimony Whereof,I have hereunto set my hand and affixed my official seal,the day and
tldni SS or call Ms
Christie lat7cson at(919)' year aforesaid. ) r
733-50a,eNlnsipn 538. ! 1 L1�t 2
Please include the NPDES I(f{ty/jW,/q (fl/(Plrmn camber{Ntachedt"to nation,
at..i, it a. sees may �Notar Public
Writ visa[he Dt 512 of y
Water Dua Nty t. ale N-
Salisbu Street.Raleigh,
NC E7s`�I41aa between My commission expires_27TH day of�,Hj�,2q_Q4
rise Hours
and r.t a.m. review
Inmrmation on hk.
1 NPDES 79rma Number afore going affidavit with the advertisement theruo annexed it is ad ud cd b the Court that the said
Neopg2e79-hey o+Wa. g 8 j g y
Pu Pmoi"�o:"neio.wii--ri n, ropetly made,and[hat the summons has been duly and legally served on the defendant(s).
'INC 284C2 has aOPiietl bar
a permit nerwwal for a I..
Th H.no..' o� No. of —
�c,,.sryinp "Co.
ash
Net iota eaa I -
Ngrineast he L+P kar
River in t C[A.aive, ,,In,Curer,,no Clerk of Superior Cozen
Para,melers arc water
quality Nmiteo. This dis�
cite all may anent his
lure all of then Fn thin
portion of 11N aceiuinq
stream.
hNPDE5C006 Pemlit Number _
rC Be 4
80.ABC UPllnts. ✓!J
Ito Beau 0. 1g6 Plante.
[ion.PO 8a.15659,W.I.
minatcn. NC 20lAN has
nin, to
ra l f r fitility ln`N w
Hanover discharging
emitted wfestewater n[o 1.
[ipe rear III—lajl,
��rtenUy no rcmeten
arc water qualiTy limited.
lure
a Ilocations y.this
porionof bar sec rig
steam.
NPOES Permit Number
NCOO51%9. laurel Du-
and susan Hale
Hermitage House pest
�Moniel, .724 Castle
Ma yea rbatl, Castle
Mayne,NC 2BA29 has ap.
plied I fsANty 5locatedwlfl
W.Hilinoyer County Ild-
ChNrnig heated was[e-
weter into a med
tripirtaryto PrincenGeorge
Cfeek In the Cape Per.
Rlvl+ Basin. Cll—"I
90D. ammonia nerrgen
total residua I
and l Dhlo-I
dna arc nYNer wality
Nmitrd. This Isschg rge
may affect luturm alloca.
tiers in[tis Dorfign CO the
recrimnng streamNPDES Ptmut Number
MCOGS9978. Aqua
Source,Inc.Ocean Forest
"Im,WN7P.5717 Carn-
ana Beach Road, Wd-
^P^P���on- NC 28411 w7 has
nCikanl'dT.,A Fatl-rN y sn`Ne.
Hanover county aK-
..forirmA crested waste-'
water Into Gee Fear.
River!n rise COD! Fee,
Basin- Cunlntly BOD,
dlssotvred oay9en aril
ammpnle a delis qwl.
}ryay hmrtee-This dunarge
m nett Muse aibca-
tl.M1s in this WNon of Ind
receiving Stream

Re:draft permit-N01002879(5weene�,WIT)
Subject: Re: draft permit-NCO002879 (Sweeney WTP)
Date: Tue, 06 Nov 2001 13:31:41 -0500
From:Jim Bushardt <[e-mail]>
To: Charles Weaver <[e-mail]>
Hello Charles,
I guess the standard WTP monitoring takes precedence over the monitoring
requests that I presented within the staff report. By the way, you do realize
that Sweeney Plant is a surface water treatment plant, also pH adjustment
capability exists.JS
Charles Weaver wrote:
> Jim, T 'm attaching the draft permit for your review. It won 't be sent
> to Notice for another week, so send in any comments you have.
> The limits in the draft are based on the 1992 permitting strategy for
> WTPs. Per that strategy, pH monitoring was deleted from the draft.
> Turbidity was eliminated from the last permit. Since you didn 't
> specifically mention re-introducing it in the staff report, T didn 't add
> it to the draft.
> Per your suggestion, I simplified the facility description to the
> standard text we use in most WTP permits.
> Let me know if there's anything else you 'd like changed.
> CHW
------------------------------------------------------------------------
> Name: 02879box.doc
> 02879box.doc Type. Winword File (applicationlmsword)
> Encoding: base64
> Download Status: Not downloaded with message
>
> Name: 02879draft.doc
> 02879draft.doc Type: Winword File (applicationlmsword)
> Encoding: base64
> Download Status: Not downloaded with message
Jim Bushardt <lini.Bushardt:(c�.ncmail.ne >
1 of 1 11/14/2001 8:47 Ant

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ROAD CLASSIFICATION SCALE 1 :24 000
PRIMAR'YMGHWAY UGHT-DUTY ROAD.HAROOR 0 1 MILE
HARD SURFACE IMPROVED SURFACE -
'i
SECONDARY HGHWAY 0 70W FEET
HARD SURFACE LINIMPRDVED AOAI? ,...,.
1 0 1 KILOMETER
Latitude 35°00'42" Longitude 78100'49" `
Map # G26SE Sub-basin 030622 CONTOUR INTERVAL 10 FEET
Stream Class C-Swam
QUAD LOCATION National Spinning Company
Discharge Class 1`I LZ 60
NC0002763
Receiving Stream Grove Creek/Cape Fear River Duplin County
Design Q Variable Permit expires 7/31/01 Warsaw Plant WWTP
i

SOC PRIORITY PROJECT: No
To: Permits and Engineering Unit
Water Quality Section
Attention: Charles Weaver
Date: April 12 , 2001
NPDES STAFF REPORT AND RECOMMENDATION
County: New Hanover
Permit No. NC0002879
APR 19 2001
PART I - GENERAL INFORMATION
OFNR - VIATER QUALITY
POINT SOURCE BRANCH
1 . Facility and Address : City of Wilmington
Sweeney Water Treatment Plant
Post Office Box 1810
Wilmington, North Carolina 28402
2 . Date of Investigation: April. 10, 2001
3 . Report Prepared by: Jim Bushardt
4 . Persons Contacted and Telephone Number:
Mike Richardson, Michael Kennedy, Bill Fortune
910-343 -3690
5 . Directions to Site: The facility is located in Wilmington at
Hilton Park (Castle Hayne Road)
6 . Discharge Point (s) :
Latitude: 34 Deg 12 Min 30 Sec
Longitude: 77 Deg 56 Min 54 Sec
U.S .G.S . Quad No: S-57 U.S.G.S. Quad Name: Castle Hayne, NC
7 . Site size and expansion area consistent with application?
The application did not cover site size or potential
expansion area. There is land available for an extra
thickener or clarifier.
8 . Topography (relationship to flood plain included) : The USGS
Quad for Castle Hayne does not present elevations. By crude
observation, the treatment units are located on a high river
bank and not considered to be within the 100 year flood zone.

9 . Location of nearest dwelling: 0 . 6 miles south of plant
10 . Receiving stream or affected surface waters : Northeast Cape
Fear River
a. Classification: SC swamp
b. River Basin and Subbasin No. : 030617
C. Describe receiving stream features and pertinent
downstream uses: High flow volume river segment
usable for secondary recreation.
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1 . Pertinent Information
a. Volume of wastewater to be permitted:No flow limitation
for water supply plants (SIC 4941) per NCAC 2B. 0500 .
b. What is the current permitted capacity of the wastewater
treatment facility? No permitted flow limitation exists
even though the clarifier and gravity thickeners were
designed based upon detention and weir overflow rates.
C. Actual treatment capacity of the current facility
(current design capacity) ? Less than or equal to 1.5 MGD
according to the applicant.
d. Date (s) and construction activities allowed by previous
Authorizations to Construct issued in the previous two
years : None
e. Please provide a description of existing or substantially
constructed wastewater treatment facilities :
-Track-Vac solids removal system (settling basins &
backwash basin)
-Filter backwash basin (1. 0 MG, operated at less volume)
-Flow splitter with mixing
-Dual gravity thickeners with mechanical scrapers
-Upflow clarifier
-Caustic and polymer feed tanks and metering pumps
-Dual 50 Hp sludge pumps & 6 inch force main to
dewatering equipment located at the Northside WWTP
-Magnetic flow meter/totalizer for sludge force main
-Magnetic flow meter/totalizer for gravity NPDES
discharge
-In-line turbidity meter
-Sludge truck loading station (auxiliary usage)
f . Please provide a description of proposed wastewater
treatment facilities : Nothing new is proposed
g. Possible toxic impacts to surface waters: None
h. Pretreatment Program (POTWs only) : not needed

2 . Residuals handling and utilization/disposal scheme: Water
plant sludge is blended with wastewater sludge at a separate
location, dewatered, and land applied at agronomic rates.
a. if residuals are being land applied, please specify DWQ
Permit No. WQ0001271
Residuals Contractor: Synagro
Telephone No. : [phone]
b. Residuals stabilization: The alum sludge contains very
little pathogenic content. No stabilization is performed.
C. Landfill : No
d. Other disposal/utilization scheme: none
3 . Treatment plant classification: Class I chemical/physical
4 . SIC Code (s) : 4941
Wastewater Code (s) :21
Main Treatment Unit Code: 510x3
PART III - OTHER PERTINENT INFORMATION
1 . - Is this facility being constructed with Construction Grant
Funds or are any public monies (municipals only) involved? Not
applicable for this renewal action
2 . Special monitoring or limitations (including toxicity)
requests : It is requested that monitoring and effluent limits
per NCAC 15A 2B. 0500 be included except for chloride
monitoring. There is no ion exchange treatment and
subsequently no need for chloride monitoring or toxicity
monitoring related to brine discharges . It is further
requested that chlorine, aluminum and iron be dropped from the
effluent monitoring. The current limits on pH are fine for SC
swamp waters .
3 . Important SOC, JOC or Compliance Schedule dates : None
4 . Has the facility evaluated all of the non-discharge options
available? No
Please provide regional perspective for each option evaluated.
Spray Irrigation: Large land area would be needed. The
facility is within an urban area and land costs would be
considered to be excessive.
Connection to Regional Sewer System: Alum sludge is not
typical domestic strength sewage. Settling within the
collection system and overloading wastewater plant headworks
would be the likely results of this option.
Subsurface: Not practical

Other disposal options : Recycle treated effluent into
influent raw water & continue sending sludge to WWTP.
5 . Other Special Items: None
PART IV - EVALUATION AND RECOMMENDATIONS
This report is being prepared based upon a permit renewal
request by the permittee. Surface water from the Cape Fear
River is treated at the Sweeney Water Treatment Plant .
Flocculation chemicals are added and mixed, sedimentation,
filtration, disinfection, pH adjustment and fluoride treatment
are performed. Alum sludge from the sedimentation basins is
removed via track-vac system and sent to the mixed flow
splitter (where polymer is added) , and to dual gravity
thickeners . Filter backwash is sent to the backwash basin,
retrieved by the track-vac system and sent to the upflow
clarifier. Effluent from the clarifier and thickeners is pH
adjusted and combined within a single outfall .
The facility performed a study to determine if recycling
the wastewater discharge into the water treatment plant
influent was feasible. Monitoring data is enclosed for
assisting in the evaluation of the writer' s monitoring
reduction request. Although not of concern, it is interesting
that fluoride is present in the effluent because fluoride is
added after the filtration treatment phase. No wastewater is
contributed to the wastewater system after filtration.
The current treatment plant description within the cover
sheet supplement is not accurate. The review writer may want
to compare the supplement page to the writer' s treatment plant
description and perform modification, if deemed necessary.
It is recommended that NPDES Permit No. NC0002879 be
modified with the latest boilerplate permitting language
applicable for this discharge with consideration given to the
writer' s requested permit modifications and reissued to the
City of Wilmington for a term to end consistently with other
permittees within this river basin.
r
l L
nature of repo t preparer ate
1 �V—
Water Quality Regional Supervisor Date
JB:SWEENEY. 401
cc: Wilmington Office Files
Central Files
Technical Support Branch

CITY OF WILMINGTON
SWEENEY WATER TREATMENT FACILITY
STUDY OF RECYCLE POTENTIAL OF SWEENEY WTP
' CLARIFIER NPDES DISCHARGE-
Introduction
An in-house study to determine the applicability of potential recycling of clarifier
NPDLS discharge was characterized by a yearlong sampling and analytical profile. This
tclarifier discharge effluent is the result of facility treated wastewater from iibinerous
waste streams. These include filter backwash water, sedimentation basin sludges and
' overflow waters, and superpulsator sludge withdrawals. Periodically it may also include
waters and sludges as a result of scheduled maintenance. This includes the draining of
sedimentation basins, the superpulsator, ozone contactors, and the wastewater clarifier or
thickeners themselves. This study incorporated all possible and potential discharges
during the course of the sampling year, as well as encompassing such influencing factors
as seasonal and adverse weather conditions. The treated effluent with the recycling
' potential is discharged to the Northeast Cape Fear River under the provisions of NPDLS
Discharge Permit NCO002879. A discharge flow rate up to I.00MGD is generally typical.
Sampling and Monitoring Plan
The study was initiated oil 26January99 and Concluded oil 4.1anuary00. During 1111s time
' frame, seasonal climatic conditions as well as several reported northeasterly storm events
and three hurricanes occurred. These were pertinent factors, which have an influence on
the treat ability of both potable and wastewaters at the Sweeney Facility. Below is a
' detailed listing of the Sampling Plan as suggested by Mr. Fred Hill, WTI' Consultant of
the Public Water Supply Section, NCDENR.
Samples of both Sweeney source raw water and the clarifier NPDLS effluent of'recycling
potential were collected on a bi-weekly basis. The raw sample was a grab and the
clarifier NPDLS discharge effluent was a 24hr composite sample. The composite sample
' was collected by a Sigma model 3000 refrigerated automatic sampler. It was
programmed to collect in a timed mode, thus collecting the discharge NPD13S stream in
I00nil aliquots at I0-minute intervals. These analysis included temperature, pI-1, chlorine
' residual, turbidity, color, chloride, fluoride, alkalinity, carbon dioxide (acidity), iron,
manganese, aluminum, total organic carbon, bromide, total c:oliform, E. coliform, and
heterotrophic plate counts (I-IPQ. Temperature, pI-I, and bacterial analysis were collected
' by grab sample.
Monthly analysis for T-THM's and T-THM (formation Potential) were collected on both
' raw and NPDLS discharge effluent samples. Samples foi- the analysis of
CiyptosporidiUrn and Giardia of both Sweeney WTI' raw and finished water were
collected a month preceding the study oil 21 Dcc98 and during the study oil 29Dec99.

1
Results
' Analytical data from the study is included as all attachment titled "SIt eeney WZP-
Backwash Recycle Study". This is presented in a tabular form on both raw and NPDES
' discharge effluent samples for all analysis as indicated above. Additionally,
comparability time series graphs for several of the parameters are included also. Mr. Hill
initially indicated that he had concerns that influent water quality may deteriorate during
' periods of recycling. His concern is especially related to that of microbial and/or
protozoan organisms, organic compounds, TTI-IM's, taste and odor compounds, and
inorganic compounds including Fe, Mn, A1, and others. Below is a comparability
' summary listing of monitoring parameters.
➢ 1-lydrogen-Ion Concentration (pl-1): Raw pI-l's ranged from 6.15-7.18su while
' effluent pl-l's from 6.39-7.74su. No adverse impact of comparability.
➢ Chlorine residual was not detected on either sample.
➢ Turbidity: Raw turbiditics averaged 9.78NTU whereas efllucnt turbiditics
' 4.36NTU. Comparison very minimal but discharge effluent lower.
➢ Color: Raw color averaged 55.43cu whereas effluent color 9.65cu. Comparability
of recycle effluent much lower.
Chloride: Raw Cl averaged 12.14mg/l whereas effluent Cl 12.83mg/l. No
comparability, streams unchanged.
➢ Fluoride: Raw Fl averaged 0.171ng/1 whereas effluent F1 0.16nng/l. No
' comparability, streams unchanged.
➢ Total Alkalinity: Raw Alk. averaged 16.61 nng/1 whereas effluent Alk. 12.63mg/l.
Comparability much unchanged but a slight loss in effluent stream.
➢ Carbon Dioxide (Acidity): Raw CO2 averaged 5.50mg/l whereas effluent
averaged 2.9Img/l. Comparability much unchanged. Slightly lower in effluent.
➢ Iron: Raw Fe averaged 0.75mg/l whereas effluent 0.26mg/I. Effluent contains
' less iron, which is probably concentrated in sludge.
➢ Manganese: Raw Mn averaged 0.02mg/l whereas effluent 0.1 1 mg/l. Slightly
greater in effluent probably due to concentrating of llhe process sludge.
' ➢ Aluminum: Raw Al averaged 0.39mg/l whereas effluent 0.621ng/l. Slightly
greater in effluent probably due to alum concentration in the process sludge.
➢ Total Organic Carbon: Raw TOC averaged 7.63mg/1 whereas effluent 3.98mg/I.
Comparability lower in effluent.
➢ Bromide: Raw Br averaged 0.09mg/l whereas effluent 0.08111g/I. Comparability
much unchanged from streams.
' ➢ Total Coliform: Raw T.coli indicated an arithmetric mean of 451.77/100ml
whereas effluent 173.55/100m1. fewer organisms in effluent stream.
➢ Lsch. Cofiform: Raw E.coli indicated an arithmetric mean of 4.13/100m1 whereas
' effluent 0.27/100nd. This indicates fewer colonies potential in effluent.
➢ I-leterotrophic Plate Count: Raw HPC indicated an arithmetric mean of
3893.16cfidm1 whereas effluent of 90240.91 efu/ml. This is expected due to the
' FIPC counts prevalent in backwash filter water from the biological filters. 1-11'C's
are easily disinfected and sterilized by use of chlorine or ozone.
1

1
' ➢ TTHM's: Raw TTHM's averaged I.06ug/l whereas effluent 4.27ug/l.
Comparability much unchanged and insignificant.
TTI-IM Formation Potential: Raw T`l HM Formation Potential averaged
' 449.12ug/1 whereas effluent 227.84ug/I. Effluent much less than raw indicating
possibly a better quality source as attributed to prior ozonation.
Cry ptosporidium and Giardia: Raw and finished water samples during; the study
period indicated no cysts or oocysts to be observed in either sample stream.
' Conclusions
The results of this study clearly indicate that the clarifier NPDI7-S discharge waters are of
' a much better quality than that of existing raw source water obtained from the Cape fear
River at Kings Bluff. Generally with the exception of HPC, all constituents were much
lower in the effluent stream. The HPC's ni the effluent are a direct result of filter
backwash water, which normally Would contain these levels. This is due to the biological
operation of the filters at this facility. Routine operation of the Sweeney filters indicates
HPC's in the filtrate reported from 10000cfu/ml to 40000efuhi 1. Filter operation is based
on the greater abundance of these organisms to reduce the biodegradable carbon before
pumping to system distribution. In the treatment trains of the plant, once chlorine is
applied to the filtered water, the HPC's are reduced to 0.0efu/m1. The NPDLS discharge
' effluent also demonstrates a much less TTI-IM Formation Potential than that of raw
source waters. This is probably the result of ozonation and GAC/biological filters.
The City of'Wilmington's Sweeney WIT proposal is to recirculate this NPDES discharge
effluent back to the headworks of the facility. "]'his water would combine with raw
source water from Kings Bluff and then enter the Pre-Ozone Contactors for complete
' ozonation. This conforms with Section 0.0404(k) of the N.C. Rules Governing Public
Water Supplies allowing not more than 10% of the instantaneous raw flow to be from
recycled water sources. Once approval is granted pending review of this project data, the
1 City Will submit detailed plans and specifications for piping; and pumps to the Plan
Review Branch of the Public Water Supply Section. This will be prepared by a registered
engineer of practice in N.C.
1

07/0712000 12:1622 PM SWEENEY WTP-BACKWASH RECYCLE STUDY Page 1
RECYCLE-BACKWASH STUDY
1 2101 11 998 TO 01/05/2000
FDateRAWESb SAMPI SAMP TIME RAW TEMP RAWpH CL2 RAW TURB. RAW COLOR R CHLORIDE R FLUORibE R ALKALINI
De C SU MG1L NTU CU MGIL MG/L MGIL
01/26/1999 849.00 955.00 17.20 6.43 0.00 28.00 43.00 11.00 0.11 14.00
02109/1999 1,335.00 824.00 2020 6.62 0.00 26.00 47.30 8.00 C.00 13.00
02/23/1999 1,848.00 830.00 18.70 6.61 0.00 8.20 44.00 10.00 C.14 12.00
03/16/1999 2,581.00 822.00 16.30 6.85 0.00 5.60 35.50 12.00 C.17 15.00
03/30/1999 3,111.00 734.00 18.80 6.82 0.DO 13.30 44.00 C_12 15.00
04/13/1999 3,640.00 748.00 21.50 6.66 0.10 11.30 47.00 11.00 C.16 18.D0
04/27/1999 4,212.00 812.00 21.80 7.18 0.00 7.80 45,00 12.00 C.12 14.DO
05/11/1999 4,447.00 750.CD 22.10 6.50 0.00 6.50 65.00 8.00 0.11 20.00
05125/1999 5,304.00 754M 23.30 6.46 0.00 8.76 65,00 8.00 C.10 14A0
06/15/1999 6,110.00 823.00 27.50 6.39 0.00 5.98 46,00 15,00 C.28 17.00
06/22/1999 6,409,00 747.00 24.40 6.25 O.D0 9.13 53.00 13.00 0.28 17.00
07/1311999 7,228.00 823.00 25.90 6.58 0.00 3.50 36M 1&00 0.23 16.DO
07/27/1999 7,758.00 834.00 28.50 6.52 0.00 30.00 40.00 0.21 20.00
08/10/1999 8,306.00 954.00 27.70 6.43 5.20 34.00 23.00 0.28 20.00
08/24/1999 8,886.00 1,355.00 28.50 6.68 0.00 6.06 29.00 25.00 0.41 28.00
09/07/1999 9,319.00 905.00 26.20 6.74 O.00 4.63 24.00 18.00 0.27 22.00
09/28/1999 10,051.00 951.00 23.60 6.33 0.10 5A 4 89.00 9.DO 0.13 17.00
10/12/1999 10,572.00 825.00 23.10 6.42 0.00 6.60 84.00 6.00 0.10 17.00
1012911999 11,197.00 811.00 19.40 6.36 O.00 7.34 109.00 8.00 0.10 13.00
11/0911999 11,616.00 835.00 19.90 6.53 O.OD 7.00 81.00 8.00 0.13 13.00
11/23/1999 12,187.00 828.00 20.10 6.45 0.00 8.70 89.00 10.00 0.14 15.00
12/14/1999 13,020.00 955.00 22.00 6.15 0.00 4.58 67.00 12.00 0.14 - 17.00
01/04/2000 123.00 949,00 19.30 6.50 0,00 5.70 58.00 10.00 0.13 15.00
Average 6,526.48 861.91 22.44 6.54 0.01 9,78 55.43 12.14 0.17 16.61
Total 150,109.00 19,824.00 516.10 150A6 0.20 225.02 1,274.80 255.00 3.86 382.00
Minimum 123.00 734A0 16.30 6.15 0.00 3.50 24.00 6.00 0.00 12.00
Ma-amum 13,020.00 1,355.00 28.50 7.18 0.10 30.00 109.00 25.00 0AI 28.00

07/07/2000 12:16:23 PM SWEENEY WTP-BACKWASH RECYCLE STUDY Page 2
RECYCLE-BACKWASH STUDY
12/01/1998 TO 01105/2000
pate RAW CO2 RAW IRON RAW MN R ALUMINUM RAW TOC R BROMIDE R.T.COLI R. E. COLI RAW HPC RAW TTHM'S
MGIL MG/L MG/L MG IL MGIL MGIL #/100ML #/100ML CFU/N UGIL
01/26/1999 1.56 0.02 1.03 9.26 0.34 1,413,60 48.70 3,500.00 0.00
02/09/1999 5.00 0.98 0.01 0.69 8.34 0.04 275,50 13.50 1,700.00
02/23/1999 4.00 0.75 0.01 0.53 7.51 0.04 139.60 7.40 580.00 0.00
03116/1999 4.00 0.70 0.01 0.46 6.32 0.05 6760 3.10 650.00
03/30/1999 5.00 0.97 0.02 0.52 7.52 0.05 63.80 1.00 1,000.00 2.20
04/13/1999 5.00 0.81 0.08 0.54 7.40 0.06 228.20 3.00 630.00
04/27/1999 7.00 0.70 0.01 0.39 6.38 0.06 47.10 0.00 850.00 1.00
05/11/1999 7.00 0.90 0.01 0.53 7.15 0.07 165.00 0.00 750.00
05/25/1999 7,00 0.88 0.02 0.38 7.30 0.04 435.20 2.00 27,000.00 1.00
06/15/1999 7.00 0.69 0.02 0.18 5.98 0.09 344.80 0.00
06/22/1999 7.00 0.76 0.01 0.32 6.77 0.06 547.50 0.00 950.00 1.00
07/13/1999 9.00 0.40 0.02 0.04 5.80 0.07 191.80 0.00 900,00
07/27/1999 3.00 0.60 0,03 0.26 5.65 0.12 248A0 0.00 1,00
08/10/1999 5.00 0.64 0.08 0.30 5,94 0.14 307.60 0.00
08/24/1999 5.02 0.35 0.02 0.22 5.75 0.25 2,419.20 0.00 3,500.00 2.50
09/07/1999 4.D0 0.45 0.02 0.13 6.40 0.20 1,046.20 1.00 970.00
09/28/1999 14.00 C.63 0.01 0.46 12.14 0.08 770.10 2.00 29,000.00 1.00
10/12/1999 8.00 0.88 0.01 0.31 11.68 0.07 125.90 0.00 600.00
10/29/1999 3.00 0.17 0.05 0.56 12.47 0.05 261.30 3.10 370.00 1.00
11/09/1999 3.00 0.95 0.01 0.30 9.81 0.04 365.40 4.10 660.00
11/23/1999 1.00 1.05 0.02 0.47 7.48 0.07 648.80 2.00 1.00
12/14/1999 6.00 0.77 0.01 0.16 6.93 0.12 93.30 0.00 210.00
01/04/2000 2.00 0.78 0.01 0.20 5.51 0.05 185,00 4.10 150.00 1.00
Average 5.50 0.75 0.02 0.39 7.63 0.09 451,77 4.13 3,893.16 1.06
Total 121.02 17.31 0.48 8.95 175.48 2.14 10,390.60 95.00 73,970,00 12.70
Minimum 1.00 0.17 0.01 0.04 5.51 004 47A 0 0.00 150,00 0.00
Maximum 14.00 1.56 0.08 1.03 12.47 0.34 2,419.20 48.70 29,000,00 2.50

07/07/2000 12:16:24 PM SWEENEY WTP-BACKWASH RECYCLE STUDY Page 3
RECYCLE-BACKWASH STUDY
12/01/1998 TO 01/05/2000
Date R TTHM POT GIARDIA CRYPTO ESD SAMP# SAMP.TIME EFF.TEMP EFF.pH EFF.CL2 EFF.TURB. I EFF.COLOR
UGIL c sts/vol. c stslvol. De C SU MGIL NTU CU
1221/1998 0.0D 0.00
0126/1999 40.70 859.00 940.00 7.14 0.00 5.30 5.00
02/09/1999 1,345.00 815.00 7.30 0.00 4.40 5.00
02/23/1999 446.10 1,857.00 816.00 7.74 0.00 1.27 39.00
03/16/1999 2,590.00 808.00 6.62 0.00 0.51 5.00
03/30/1999 400.70 3,120.00 803.00 7.30 0.00 3.70 49.00
04113/1999 3,649.00 806,00 7.49 0.00 5A0 5.00
04/27/1999 423.70 4,221.00 805,00 6.44 0.00 0.61 10.00
05/11/1999 4,758.00 809.00 6.73 0.00 6.73 24.00
0525/1999 570.00 5,314.00 821.D0 22.40 6.86 0.00 3.41 5.00
Ml5/1999 6,119.00 854,D0 8.50 6.89 0.10 3.49 5.00
0622/1999 431.50 6,419.00 813.00 24.10 7.24 0.00 4.90 5.00
07/13/1999 7,237.00 815.00 26.90 7.06 0,00 0.42 5.00
0727/1999 403.10 7,768,00 825.00 29.00 6.84 0.00 30.00 5.00
08/10/1999 8,341.00 954.00 29.30 7.67 0.00 1.50 5.00
0824/1999 401.50 8,885.00 1,335.00 28.8D 7.16 0.00 1.78 5.00
09/07/1999 9,328.00 859.00 26.10 6.89 0.00 2.76 5.00
0928/1999 586.50 10,050.00 941.00 22.00 7.17 0.00 11.00 8.00
10/12/1999 10,581.00 817.00 21.40 6.39 0.00 3.10 6.00
1029/1999 692.40 11,207.00 808.00 15.10 6.97 0.00 3,42 5.00
11/0911999 11,625.00 830.00 15.10 6.66 0.00 0,95 6.00
11/23/1999 577.70 12,202.00 834.00 15.70 6.98 0.00 1.83 5,00
12/14/1999 13,029.00 1,025.00 13.60 6.44 0.00 2.54 5,00
12129/1999 0.00 0.00
01/042000 415.50 132.00 1,000.00 10.90 6A7 0.00 1.20 5.00
Average 449,12 _ 0.00 0.00 6,549.39 875.35 20.59 6.98 0.00 4.36 _ 9.65
Total 5,389.40 0.00 0.00 150,636.00 20,133.00 308.90 160.65 0.10 100.22 222.00
Minimum 40.70 0.00 0.00 132.00 803.00 8.50 6.39 0.00 0.4_2 _ 5.00
Maximum 692AD 0.00 0.00 13,029.00 1,335.00 29.30 7.74 0.10 30.00 49.00

07/07/2000 12:16:24 PM SWEENEY WTP-BACKWASH RECYCLE STUDY Page 4
RECYCLE-BACKWASH STUDY
12101/1998 TO 01/052000
Date E CHLORIDE E FLUORIDE EFF ALK, EFF.CO2 EFF,IRON EFF. MN EFF.AL EFF.TOC E BROMIDE E.T.COLI
MG1L MG/L I MGIL MG& MGIL MG/L. MG/L MG/L #/100ML
01/26/1999 13.00 0.20 18.90 0.23 0.05 1,00 3.72 _ 0.03 12.20
02109/1999 9.00 0.10 14.00 2.00 0.13 0.06 0,64 3,78 0.03 20.30
02/23/1999 9.00 0.15 15.30 3.00 0.12 0.05 0.43 350 0.05 7.40
03/16/1999 14.D0 0.13 TOO 3.00 0.04 0.06 0.13 2.77 0.05 2.00
03/30/1999 0.12 12.00 2.00 0.37 O.D5 0.85 3.64 0.04 4A0
04/13/1999 12.00 0.16 16.20 2.00 0.22 O,D8 0.83 4.17 0.05 156,50
04/27/1999 12.00 0.00 13.00 2,00 0.75 0.08 0.19 3.20 0.06 35,40
05/11/1999 10.00 0.08 11.00 4.00 0.16 0.05 0.45 4.14 0.06 29,20
05/25/1999 8.00 0.07 10.00 3,00 0.18 0.03 0.6B 4.17 0.05 155,30
O6/15/1999 15.00 0.17 10.00 2,00 0.33 0,13 0.43 4.36 0.08
06/22/1999 14.00 0.17 15.00 2.00 0.29 0,16 0.77 3.78 0.08 648.80
07/1311999 16.00 0.19 11.00 2.00 0.03 OAS 0.15 2.65 0.07 34.50
07127/1999 0.20 12.00 1.00 0.18 0.15 0.44 3.11 0.11 248.10
08/10/1999 22.00 0.25 21.00 1.00 0.13 0.26 0.94 3.69 0.15 190.40
08/24/1999 28.00 0.31 16.00 2.00 0.09 0.20 0.32 3.81 0.25 1,553.10
09/07/1999 19.00 0.25 12.00 2.00 0.07 0.20 0.40 4.06 0.17 209.80
0928/1999 10.00 0.28 14.00 5.00 0.48 0.14 2.59 9.46 0.06 325.50
10/12/1999 8.00 0.09 9.00 6.00 0.21 0,28 0,65 5.23 0.07 72.30
10129/1999 6.50 0.10 9.00 7.00 1.10 0,01 0.61 4.90 0.06 5.20
11/09/1999 10.00 0.16 11.00 1.00 0.08 0,02 0.26 3.33• 0.05 9.70
11/23/1999 12.00 0.13 12.00 1.00 0.17 0.05 0.39 3.50 0,07 48.70
12/14/1999 12.00 0.15 11.00 9.00 0.59 0.27 0.79 3.98 0.16 49.60
01/04/2000 10.00 0.13 10.00 2.00 0.05 0.02 0.21 2.62 0.07 0.00
Average 12.83 0.16 12.63 2.91 0.26 0.11 0.62 3.98 _ 0.08 173.55
Total 269.50 3.59 290.40 64.00 5.95 2.58 14.15 91.57 1.88 3,818,10
Minimum 6.50 O.DO 7.00 1.00 0.03 0.01 0.13 2.62 0.03 0.00
Maximum 28.00 0.31 21.00 9,00 1.10 0.28 2.59 9.46 0.25 1,553.10

07107f2000 12:16:25 PM SWEENEY WTP-BACKWASH RECYCLE STUDY Page 5
RECYCLE-BACKWASH STUDY
12/01/1998 TO 01/052000
Date EF#110QMLI ECF/ML f EFF T7��'S E TTHM POT
UG/L
01126/1999 0.00 160,000.00 7.70 194.00
C2/09/1999 0.00 200,000.00
02123/1999 0.00 42,000.00 5.30 180.90
03/16/1999 0.00 200,000.00
03/30/1999 1.00 44.000.00 4.90 224.10
04113/1999 1.00 170,000.00
0427/1999 0.00 19,Boo.00 2.00 223.80
05111/1999 1.00 110,000.00
05/25/1999 0.00 140,000,00 2.00 357.30
06115/1999 102,000.00
0622/1999 0.00 72,000,00 4.50 247.80
07/13/1999 1.00 45,000.00
0727/1999 0.00 1.00 230.10
08/10/1999 0.00 33.000.00
0824/1999 0.00 116.000.00 5.70 228.70
09/07/1999 1 A0 50,000,00
0928/1999 1.00 210,000.00 5.10 273.00
10/12/1999 0w 100,000.00
10f29/1999 0.00 16,000.00 3.40 255.80
11/09/1999 0.00 15,600.00
11123/1999. 0.0U 66,000.00 5.80 179.40
12/14/1999 0.00 56.000.00
0110412000 0.00 7,900.00 3.80 139.20
Average 0.27 90.240.91 4.27 227.84
Total 6,00 1,985,300.00 51.20 2,734.10
Minimum 0,00 7,900.00 1.00 139.20
Maximum 1.00 210,000.00 7.70 357.30

SWEENEY WTP - BACKWASH RECYCLE
STUDY
17 Total Organic Carbon Comparisons
� 12
7
2
1 /1 2/1 3/4 4/4 5/5 6/5 7/6 8/6 9/6 10/711 /712/8
Date ( 01/01/1999 to 01/05/2000 )
/ RAW WATER/ RECYCLE
TOT ORG EFFLUENT
CARBON TOC OPS WiN
RECYCLE-BACKWASH STUDY

SWEENEY WTP - BACKWASH RECYCLE
STUDY
150 Color Comparisons
100
U
50
0
1 /1 2/1 3/4 4/4 5/5 6/5 7/6 8/6 9/6 10/711 /712/8
Date ( 01/01/1999 to 01/05/2000 )
/ RAW WATER/ RECYCLE
COLOR EFFLUENT
COLOR OPS WiN

BACKWASH RECYCLE STUDY
30 Turbidity Comparisons
25
20
z 15
10
5
0
1/1 2/1 3/4 4/4 5/5 6/5 7/6 8/6 9/6 10/711 /712/8
Date ( 01 /01 /1999 to 01/05/2000 )
/ RAW WATER/ RECYCLE
TURBIDITY EFFLUENT OPS WiN
g py
�Y�-B�Kyyp"�H�U7

BACKWASH RECYCLE STUDY
8 TTHM'S Comparisons
6
J
� 4
2
0
1 /1 2/1 3/4 4/4 5/5 6/5 7/6 8/6 9/6 10/7 11 /712/8
Date ( 01/01/1999 to 01/05/2000 )
/ RAW WATERS RECYCLE
TTHM'S EFFLUENT
TTHM'S OPS WiN

SWEENEY WTP - BACKWASH RECYCLE
STUDY
800 TTHM'S Potential Formation Comparisons
600
J
� 400
20
0
1/1 2/1 3/4 4/4 5/5 6/5 7/6 8/6 9/6 10/711 /712/8
Date ( 01 /01/1999 to 01/05/2000 )
/ RAW WATER/ RECYCLE
TTHM EFF. TTHM
POTENTIAL POTENT OPS WiN

SWEENEY WTP - BACKWASH RECYCLE
STUDY
2.0 Iron and Manganese Comparisons
1 .5
J
� 1 .0
0.5
0.0
1 /1 2/1 3/4 4/4 5/5 6/5 7/6 8/6 9/6 10/711 /712/8
Date ( 01 /01 /1999 to 01/05/2000 )
S RAW WATER IRON RAW WATER / RECYCLE EFFLUENT / RECYCLE EFFLUENT On� �'Al
MANGANESE IRON Mn r IV

SWEENEY WTP - BACKWASH RECYCLE
STUDY
250000
Bacteria{T,coli and HPC} Comparisons
200000
J
150000
LL
U 10o000
50000
0
1/1 3/4 5/5 7/6 9/6 1117 12/08/1999
2/1 4/4 6/5 8/6 10/7 12/8
Date ( 01 /01 /1999 to 01/05/2000 )
/ RAW WATER HPC RAW WATER TOTAL / RECYCLE EFF. HPC / RECYCLE EFF TOT �Pa7 W►A!
COLIFORMS COLIFORMS t11

'�,g9R2Rf'
. .y . CITY OF WILMINGTON P.O. Box1810
`1739 WILMINGTON, NC 28402
PUBLIC UTILITIES DEPARTMENT TDD(910)341-7873
Jan 24, 2001
N.C. Department of Environment and Natural Resources
Division of Water Quality
NPDES Unit
1617 Mail Service Center
Raleigh, N.C. 27699-1617
SUBJ: NPDES Permit Renewal
Permit NCO002879
Sweeney Water Plant
City of Wilmington
New Hanover County
Dear Sirs:
Please find enclosed the Renewal Application in triplicate and check in the amount of
$715.00 for processing the renewal.
Please advise me if you have questions or require additional information.
Sincerely,
Hugh T. Caldwell
Director of Public Utilities
CC: Mike Richardson, Water Plant Superintendent
Bill Fortune, Water Chief Operator
ATTACHMENTS: Application Form
Processing Fee
4 FEB - 7 20Jj
ADMINISTRATION ENVIRONMENTAL SERVICES UTILITY SERVICES WASTEWATER TREATMENT WATER TREATMENT
VOICE(910)341-7805 VOICE(910)343-3910 VOICE(910)341-7884 LOUGHLIN PLANT MAFRTT PLANT VOICE(91 D)343-3690
FAx[phone] FAx[phone] FAx[phone] VOICE(910)341-7890 VOrCE(91D)799-5860 FAx[phone]
FAX[phone]