NC0002879_Permit (Issuance)_20081120

NPDES DOCUMENT SCANNING COVER SNEET
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: November 20, 2008
li M docnm►e0Mt to prat --a olm a.exx*W-paper-ignox-*-. a;ny
coXitelmt ojm the a-eYerse side

1
'�F WAr�� Michael F. Easley,Governor
C1� QG State of North Carolina
William G. Ross,Jr., Secretary
r- Department of Environment and Natural Resources
7 Coleen H.Sullins, Director
p Division of Water Quality
November 20,2008
Mr. Bradley V.Jones
Sweeney WTP Supervisor
City of Wilmington `
407 Hilton Street
Wilmington,North Carolina 28401
Subject:NPDES Permit Modification
NC0002879
Sweeney WTP
New Hanover County
Dear Mr.Jones:
Division personnel have reviewed and approved your application for modification 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 October 15,
2007(or as subsequently amended).
This final permit contains the following changes from the draft you were sent on June 4,2008:
• 18 month compliance schedules have been added for the pH and TRC limits.
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 Mail 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 Management Act or any other
Federal or Local governmental permit that may be required.
If you have any questions concerning this permit, please contact Toya Fields at telephone
number(919)807-6385.
Since ely,
Coleen H.Sullins
cc: Central Files
Wilmington Regional Office/Surface Water Protection
NPDES Unit
AcLuatic ToxicologyUnitne
1617 Mail Service Center, Raleigh, North Carolina 27699-1617 Telephone[phone] FAX[phone] N00hCarolina
512 N.Salisbury Street, Raleigh,North Carolina 27604 On the Internet at http://h2o,enrstate.nc.us/ ;_V11111ClllIY
An Equal Opportunity/Affirmative Action Employer

Permit NCO002879
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
Cape Fear Public Utility Authority
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 January 1, 2009.
This permit and authorization to discharge shall expire at midnight on December 31, 2011.
r
Signed this day November 20, 2008.
Coleen H. Sullins, Dire for
Division of Water Quality
By Authority of the Environmental Management Commission

Permit NC0002879
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby
revoked. As of this permit issuance, any previously issued permit bearing this number is no longer
effective. Therefore, the exclusive authority to operate and discharge from this facility arises under
the permit conditions, requirements, terms, and provisions included herein.
The Cape Fear Public Utility Authority is hereby authorized to:
1. Continue to operate a water treatment plant with a discharge of potable water
by-product wastewater including filter-backwash wastewater. This facility is
located on Hilton Street in Wilmington at the Sweeney WTP in New Hanover
County.
2. Upon receipt of an Authorization to Construct from the Construction Grants
and Loans Section, construct wastewater treatment facilities.
3. 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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Wilmington - Sweeney WTP - NC0002879 r.
Facility
Location
USGS Quad Name: Castle Mayne, NC Lat.: 346 12' 30" A`i!
Receiving Stream: No Cape Fear Long.: 770 56' 54"
Stream Class: SC-Swamp New Hanover County
Subbasin: Cape Fear—03-06-17 orth y

' 1
Permit NC0002879
A. (1.) 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 from outfall 001. Such discharges shall be limited and monitored by the Permittee as
specified below:
EFFLUENT LIMITS MONITORING REQUIREMENTS
CHARACTERISTICS Monthly Weekly Daily Measurement Sample Sample
Average Avera a Maximum Frequency a Location
Flow 4.4'1_D/ Continuous Recording Effluent
Total Suspended Solids 30 mg/L 45 mg/L Weekly Composite Effluent
pH1 Between 5.8-8.5 s.u. Weekly Grab Effluent
Total Residual Chlorine2 13 pg/L Weekly Grab Effluent
Fluoride 2/Month Composite Effluent
Total Copper 2/Month Composite Effluent
Totallron 2/Month Composite Effluent
Aluminum3 Quarterly Composite Effluent
Calcium3 Quarterly Composite Effluent
Magnesium,' Quarterly Composite Effluent
Manganese3 Quarterly Composite Effluent
Total Phosphorus (TP) Quarterly Composite Effluent
Total Nitrogen (TN) Quarterly Composite Effluent
Whole Effluent Toxicity
(WET) Monitorin a Quarterly Composite Effluent
Notes
1. The pH limit shall take effect July 1, 2010. Weekly monitoring is required until the time
that the limit takes effect.
2. The TRC limit shall take effect July 1, 2010. Weekly monitoring is required until the time
that the limit takes effect. The facility shall report all effluent TRC values reported by a NC
certified laboratory (includes field certification). However effluent values below 50 Pg/L will be
treated as zero for compliance purposes.
3. Monitoring shall be conducted in conjunction with toxicity monitoring.
4. Acute Toxicity monitoring at 90% effluent concentration: March, June, September, and
December; See Special Condition A (2) of the Supplement to Effluent Limitations. The acute
test organism may be Fathead Minnow OR Mysid Shrimp OR Silverside Minnow(permittee's
choice). You may also choose to conduct comparison studies showing Ceriodaphnia dttbia to
be greater than or.equal to Mysid Shrimp in degree of sensitivity to the facility's effluent.
All samples must be collected from a typical discharge event.
There shall be no discharge of floating solids or visible foam in other than trace
amounts.

Permit NCO002879
A. (2.) ACUTE TOXICITY MONITORING (QUARTERLY)
The permittee shall conduct acute toxicity tests on a quarterhl basis using protocols defined in the
North Carolina Procedure Document entitled "Pass/Fail Methodology For Determining Acute Toxicity
In A Single Effluent Concentration" (Revised-July, 1992 or subsequent versions). The monitoring
may be performed as a Mysid Shrimp OR Fathead Minnow OR Silverside Minnow(permittee's
choice). The effluent concentration at which there may be at no time significant acute mortality is
90% (defined as treatment two in the procedure document). Effluent samples for self-monitoring
purposes must be obtained during representative effluent discharge below all waste treatment. The
tests will he performed during the months of March, June, September, and December.
All toxicity testing results required as part of this permit condition will be entered on the Effluent
Discharge Monitoring Form (MR-1) for the month in which it was performed, using the parameter
code TGE3E. Additionally, DWQ Form AT-2 (original) is to be sent to the following address:
Attention, North Carolina Division of Water Quality
Environmental Sciences Section
1621 Mail Service Center
Raleigh, North Carolina 27699-1621
Completed Aquatic Toxicity Test Forms shall be filed with the Environmental Sciences Section no
later than 30 days after the end of the reporting period for which the report is made.
Test data shall be complete and accurate and include all supporting chemical/physical
measurements performed in association with the toxicity tests, as well as all dose/response data.
Total residual chlorine of the effluent toxicity sample must be measured and reported if chlorine is
employed for disinfection of the waste stream.
Should there be no discharge of flow from the facility during a month in which toxicity monitoring is
required, the permittee will complete the information located at the top of the aquatic toxicity (AT)
test form indicating the facility name, permit number, pipe number, county, and the month/year of
the report with the notation of"No Flow" in the comment area of the form. The report shall be
submitted to the Environmental Sciences Section at the address cited above.
Should the Permittee fail to monitor during a month in which toxicity monitoring is required, then
monthly monitoring will begin immediately. Upon submission of a valid test, this monthly test
requirement will revert to quarterly in the months specified above.
Should any test data from either these monitoring requirements or tests performed by the North
Carolina Division of Water Quality indicate potential impacts to the receiving stream, this permit may
be re-opened and modified to include alternate monitoring requirements or limits.
If the Permittee monitors any pollutant more frequently then required by this permit, the results of
such monitoring shall be included in the calculation & reporting of the data submitted on the DMR &
all AT Forms submitted.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum
control organism survival and appropriate environmental controls, shall constitute an invalid test
and will require immediate follow-up testing to be completed no later than the last day of the month
following the month of the initial monitoring.
A.(3.) PERMIT RE-OPENER: TMDL IMPLEMENTATION
The Division may, upon written notification to the Permittee, re-open this Permit in order to
incorporate or modify effluent limitations, monitoring and reporting requirements, and other permit
conditions when it deems such action is necessary to implement TMDL(s) approved by the USEPA.

RE: FW:Comments for Draft NPDES Permit NC0002879
.Subject: RE: FW: Comments for Draft NPDES Permit NC0002879
From: Beth Eckert<[e-mail]>
Date: Fri, 7 Nov 2008 16:39:11 -0500
To: Toya Fields<[e-mail]>
CC: "Linda Willis (linda.willi [e-mail])" <[e-mail]>, Bradley Jones
<[e-mail]>, Michael Richardson <[e-mail]>, Pam Ellis
<[e-mail]>, Matt Jordan<matt [e-mail]>,Nancy Gallinaro
<nancy.gal [e-mail]>
Hi Toya,
Thank you for the heads up on the NPDES Permit for NC0002879. We have reviewed your comments and
appreciate your thorough consideration and inclusion,where appropriate,of our comments. It is our
understanding from reviewing the e-mail that an 18 month compliance schedule has been included in the permit
for chlorine_ This time frame should allow us to evaluate our processes and analytical results to determine if a
problem exists with achieving compliance.
Item#5 addresses the new limits on pH at 6.8-8.5 S_U.: Although this facility does have the ability to adjust pH,
this is a process that has not been in operation for many years. The equipment is old and will need to be upgraded,
and potentially replaced, in order to ensure reliable operation. We would like to request that pH be a monitoring
requirement only in the 18 month compliance schedule to allow us time to make any necessary improvements and
to install appropriate controls to ensure compliance with pH permit limits.
Thank you in advance for your consideration of these items,
Sincerely,
Beth Eckert
Cape Fear Public Utility Authority
Environmental and Safety Management Director
910-332-6646
Belli Eckert
Cape Fear Public Utility Authority
Environmental and Safety Management Director
91 D-332-6646
From: Toya Fields [mailto:[e-mail]]
Sent: Thursday, October 30, 2008 10:26 AM
To: Beth Eckert
Cc: Linda Willis
Subject: Re: FW: Comments for Draft NPDES Permit NC0002879
Hi Beth,
I'm sorry for the long delay,but I'm now able to finish processing your permit modification. In your comments
dated July 24,you requested several changes from the draft permit. I've numbered my responses to match your
comments from that letter. I wanted to give you a heads up on these before sending out the final permit.
I of 3 11/12/2008 2:49 PM

RE: M Comments for Draft NPDES Permit NC0002879
1)CFPUA has requested that the new monitoring requirements be postponed until the spring 2010 when the new
facilities are completed. We can give a compliance schedule for new limits(such as chlorine), but not monitoring
requirements. All conventional water treatment plants throughout the State are being asked to perform this
additional monitoring. There is no need to install additional treatment to comply with the proposed monitoring
requirements.
2) We can change the wording on the supplement page to indicate that your discharge is made up of potable water
byproduct wastewater including filter backwash wastewater.
3) We can allow an 18 month compliance schedule for chlorine. That was mistakenly omitted from the draft
permit.
4) Most other facilities have been able to consistently report TRC below 50 ug/L without issue. If your or your lab
are able to demonstrate that you have specific difficulties meeting this requirement,then it may be possible to
develop a site-specific compliance limit for your facility. You would have to demonstrate that the non-compliance
is due to interference and work with the lab to recommend a more appropriate compliance level(which would
need to be approved by the Division). I would recommend that you use the 18 month compliance schedule to
evaluate whether or not your facility is able to meet the limit and determine whether interference will be an issue.
5)I have an email from one of our inspectors(dated 2001-so it is admittedly several years old) indicating that the
facility does have the ability to perform pH adjustment on the effluent. Therefore I would assume that the plant
would currently be able to meet the pH limit. Please let me know if this is not the case.
6)The WET requirement is only to perform monitoring. It is not a limit at this time. Therefore your facility can
evaluate your operations and various test organisms while still complying with the quarterly monitoring
requirement. WET monitoring is a new requirement for all water treatment plants.
7)The acute WET test does allow you to use one of three test organisms, so its fine if the test code ends up
changing. The permit language will remain as-is, however you should continue to work with the Aquatic
Toxicology unit on the WET requirements_
8)40 CFR requires that wastewater be tested for total fluoride(rather than dissolved fluoride). Does your facility
fluoridate it's potable water? Is there potential for fluoridated water to be discharged? If not then we can review
the need for this monitoring requirement_
Thanks,
Toya
Beth Eckert wrote:
LeToya,
Sorry I forgot to attach the PDF the first time 1 sent this e-mail.
Attached is the PDF version of the permit response we discussed earlier. Thank you for working with us on the
timing of the letter. I've never had anything sent back to me that I sent FedEx before.
As you can see from the letter there are several items we would like for you to consider prior to issuing this
revised permit. If you would like to discuss any of these items please feel free to contact me at 910-332-6646.
2 of 3 l 1/12/2008 2:49 PM

NCDENR/DWQ
FACT SHEET FOR NPDES PERMIT DEVELOPMENT
Cape Fear Public Utility Authority
FaCzlx
(1.)Facility Name: Sweeney Water Treatment Plant .
(2.) Permitted Flow MGD): 4.4 MGD (6.) County: New Hanover
(3.) Facilit_+Class: _ II (7.) Regional Office: Wilmington __
W) Pretreatment Program: N/A (8.) USGS Topo Quad: I J27SW
(5.) Permit Status: Ex ansion (9.) USGS Quad Name: Castle Ha ne
(1.) Receiving Stream: Northeast Cape (7.) Drainage Area (mi2):
Fear River _
(2.) Sub-basin: 03-06-17 (8.) Summer 7Q10 (cfs): Tidal
(3.) Stream Assessment Unit:__18-74-(61) (9.) Winter 7Q10(cfs): Tidal
(4.) Stream Classification: SC-Sw (10.) 30Q2(cfs): _Tidal
(5.)303(d) Status: Not listed J (11.) Average Flow WOE] Tidal
(6.)305(b) Status: (12.)IWC%: Tidal
I. Summary
The Sweeney WTP is conventional water treatment plant that currently produces 27.5 MGD of
potable water per day. This facility will be expanded to produce 44 MGD of potable water.
Assuming 10%of the influent flow is used for backwashing and solids wasting,this results in a
potential 4.4 MGD of filter backwash to be discharged. The facility currently recycles a great deal
of its wastewater(approximately 75%). The permittee estimates that actual flows from this
facility will increase from 0.5 MGD to 2 MGD as they approach rated capacity,however they will
be granted the full"design"backwash rate so as not to be penalized for recycle.
Filter backwash and supernatant from the gravity thickeners are sent to an equalization basin and
then onto two clarifiers. Residuals from the clarifiers are returned to the gravity thickeners and
clarified effluent is piped to a distribution box where it is either recycled or discharged.
Thickened residuals are pumped from the gravity thickeners to the Northside WWTP.
During the expansion project, the residuals treatment process will be duplicated and expanded to
construct a new washwater flow equalization basin(to replace an existing basin that will be
demolished),additional EQ pumps,a clarifier,a gravity thickener, and two sludge pumps. The
entire recycle system will remain in service.
This draft permit has been updated to correlate with an updated permitting strategy for
conventional water treatment plants. Therefore new monitoring and whole effluent testing
requirements have been added. The need for this additional data will be reviewed at the next
permit renewal.
This facility discharges to the Lower Cape Fear. The Lower Cape Fear sub-watershed includes
the Lower Cape Fear, Northeast Cape Fear, Brunswick, and Black Rivers. Although
approximately 5,617 acres of the Cape Fear River and 744 acres of the Brunswick River are listed

NPDES Permit Fact Sheet- 06/03/08 Sweeney WTP
Page 2 NCO002879
as impaired for aquatic life due to low dissolved oxygen (D.O.) levels this segment of the
Northeast Cape Fear River is not impaired. However The Division is developing a TMDL to
address D.O.in the Lower Cape Fear River and estuary.
The permitting strategy for this sub-basin does not prescribe any change in existing permit limits
or monitoring requirements for dischargers in this sub-watershed. Permits will contain existing
limits for BOD, ammonia,and nutrients (if any). Dischargers will continue to monitor nutrients at
the frequencies set in 2B .0508 or in the existing permits.However,in light of the pending
completion of the TMDL,all permits will include a re-opener Special Condition allowing the '
Division to add or modify limits and related conditions if necessary to implement the TMDL.
II. Proposed Schedule for Permit Issuance
Draft Permit to Public Notice: June 4,2008
Permit Scheduled to Issue: August 4,2008
III. State Contact Information
If you have any questions on any of the above information or on the attached permit, please
contact Toya Fields at(919)733-5083,extension 551.
NPDES Recommendation by:
Signature Date
_Regional Office Comments:
--- �1{�52, to[rkT bvE? Mon,��r�oJ �ao�rwle. on +Ae- M,�-S Prt�G
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0. c1.v�cD� �.+� �-�'�'`� o�Fa.✓' DTP
w-�.L��e_.l-ti�A• �si�.,o �n�o '�.4ac.e9-p�1-w�-ti uv�.---�4..o cn-�2
Regional Recommendation by:
_ _ Ip O�
Signaturvurvisllorl
s � / Date Olt 1C)
Re Tona
Signature te
y li-:,��4&cam�,

Final Environmental
_ Assessment—
AN
Sweeney WTP Expansion
.. Alternatives Analysis for
- — Water Treatment Plant
Infrastructure
.. .__ _ + The existing operations buikting houses chemical storage and feed facilities and
will be modified and expanded to accommodate the new facilities.
• Existing finished water storage reservoirs,with capacities of 12 million gallons and
4 million gallons,wiltremain in service. Chemical treatment prior to storage
includes sodium hypochlorite,fluoride,sodium hydroxide,and phosphate.
0 A new finished water pumping station will be constructed to transfer water from
the finished water storage reservoirs to the service area of the distribution system.
The existing North Plant filters were initially rated at 10 mgd,corresponding to a filter
loading rate of 4,gallons per minute per square foot(gpm/sf). This plant was recently re-
rated to a capacity of 12.5 mgd,corresponding to a filter loading rate of 5 gpm/sf. The new
_ biological filters will initially be rated at 25 mgd,corresponding to a loading rate of
gpm/st which will provide a total treatment capacity of 37.5 mgd However,design
-- loading rates for the new filters is 5 gpmtsf�allowing for a re-rate once the new filters are
operational and demonstration testing has beers conducted as required by the DEH. This
information is summarized in Table 4-1.
Table 4-1; Filter Loading Ratas for Expansion of h Sweeney WTP
Exisdnz Filters Pro Flten
Number 4 la
Initial Loading Rate 5 gpm/sf 4 gpmisf
Initial Capacity(per filter) 3.125 mgd 2.5 mgd
Total Initial Capacity 12.5 mgd 25.0 mgd
Re-nded Loading Rate NA 5 gpm/sf
Re-rated Capacity(per filter) NA 3.125 mgd
Total Re-rated Capacity 12.5 mgd- 31.25 mgd
4.4.2 Waste Hancilin System
9
The waste streams will be treated in two identical treatment trains. The existing backwash holding tank
will be demolished. The new wash water and residuals handling system will include a new equalization
_ basin to collect all filter backwash and SuMPulsator basin blow-down flows,four new pumps to convey
rflow from the equalization basin,two clarifiers(one existing,one new),two gravity thickeners for basin
` sludge,and four sludge pumps(two existing,two new). Additionally,the existing recycle system will
.._ ._ remain in service.
Clarified backwash water will be discharged to the Cape Fear River. The Sweeney WTP has an existing
NPDES permit(NC0002879). During their fast year of operation with the recycle system in place,
y approximately 75%of discharge was recycled. Projected discharge rates for the plant expansion are
rARCADIs Pr*d KM NC706001.0002

Final Environmental
Assessment--
Sweeney WTP Expansion
f
Alternatives Analysis for
Water Treatment Plant
Infrastructure
summarized in Table 4-2. Discharge quality from the expanded WTP is expected to be similar to existing
effluent concentrations. Thickened solids are pumped to the Northside WWTP for dewatering and
blending with dewatered biosolids. Figure 4-4 provides a process flow diagram of the proposed solids
handling facilities.
Table 4-2: S1KmM WTP NPDES Discharge Rates
Discharge Flour With Recycle(mgd) _ Without Recycle(mid)
-Current Capacity(27.5 mgd) 0.69 2.8
Proposed Expansion(35 mgd) 0.88 3.5
P-e-rated ac�W mgd) 1.1 44
4.4.3 Design Criteria for Proposed Finished Water Transmission Mains
Four transmission mains currently convey potable water to the distribution system. These include the 24-
inch Fourth Street water main,the 24-inch Fifth Street water main,the 30-inch Fifth Street water main,and
the 26-inch Fifth Street water main. A new 42-inch main will be constructed as part of this expansion.
This main will be routed along Sixth Street to an existing 36-inch main on Cape Fear Street.
fl
i,
I
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i`
I

FEB-11-2008 16:32 NC DENR PUBLIC WATER SUPP 919 715 4374 P.01
T R A N S M I T T A L
To:
Fax: l f / -70
_
From: J c alf c Dd
Date: °� d
Pages: o2 3-n c&v C1r o ,? g-,gPPo-
A
y'e✓,e u'.
e
Public Water Supply Secrion
Div. of Environmental
DF.NR
1634 Mail Service Center
Raleigh, NC 27699-1634
[phone]
FAX#[phone]

FEB-11--2008 16:32 NC DENR PUBLIC WATER SUPP
919 715 4374 P-02
North Carolina
Department of Administration
Michael F. Easley, Governor Britt Cobb. Secretary
February 8, 2008
Mr. Jim McRight
NCDENR, Public Water Supply Section
1634 Mail Service Center
Raleigh,NC 27699
Dear Mr, McRight:
Re: SCH File # 08-E-4300-0187; EA/F'ONSI; City of Wilmipgton Sweeney Water Treatment Plant
expansion from 27.5 to 44 million gallons per day in New Hanover County
The above referenced environmental impact information has been reviewed through the State
Clearinghouse under the provisions of the North Carolina Environmental Policy Act.
No comments were.made by any state/local agencies in the course of this review. Therefore, no further
environmental review action on your part is required for the compliance with the Act.
Best regards.
Sincerely,
Ms, Chrys Baggett
Environmental Policy Act Coordinator
cc: Region 0
Mailing Address: Telephone; [phone] LocationAddreis:
1301 Mali Servicc Center Fax[phone] 116 West.Jones Street
Raleigh;NC 27699.1301 Smic Couricr#51-01.00 Raleigh,North Carolina
e-mail Chryj.Baggelr@-1rwfr-ail net
An Equal Opporrtrntty/�(/ftrmatrve Action Employer
TOTAL P.02

Uatk INS a&
npu aar
PUNC U11Ifily Aulhaday IR-r:!:cr1VRO
Stewardship.Sustai n abil it V.Service.
JUL 0 9 2008
July 2, 2008 BY.
Ms, LeToya Fields, Eastern NPDES Program
State of North Carolina �--
Department of Environment and Natural Resources
Division of Water Quality U
i
1617 Mail Service Center i
Raleigh, North Carolina 27699-1617 Z 4 2008 U�
i
RE: Comments for Draft NPDES Permit NC0002879 i
WdTER OUAIfIY
rIr.r
Dear Ms. Fields: ``"�`�----•
We are in receipt of a draft NPDES permit dated June 4, 2008 for discharge of filter-backwash water
from the Sweeney Water Treatment Plant located at 407 Hilton Street, Wilmington, NC. We have
completed our review of the permit and we agree with your statement in your cover letter that the draft
permit has "...significant changes" from our current permit. As you are aware, we requested a
modification to our presently existing NPDES permit in December 2007 due to a planned water
treatment facility upgrade that includes some modification of the wastewater treatment facilities and
addition of a clarifier. The construction project will commence October 2008 and is scheduled to be
completed in the spring of 2011. Following are our comments regarding the draft permit:
1. Permit Cover Sheet; Permit effective date: Construction of the wastewater treatment facilities
takes place in the first phase of the project and is scheduled to be completed by spring of 2010.
las�� We are requesting the new permit limits be effective following the completion of the
cc wastewater treatment facilities In spring of 2010, and until such time the existing permit limits
remain in effect. This will allow the Authority time to evaluate our operational processes to
00� determine if there is a need for additional treatment to comply with the monitoring
rZweents and allow time to perform water quality monitoring for constituents of concern.
2. ent to Permit Cover Sheet: Wording In Rem 1. Indicates that we will be authorized to
�"" ,► 5 "...operate a water treatment plant with.a discharge of filter-backwash wastewater." In fact, our
discharge is made up of potable water by-product wastewater which includes filter-backwash
l wastewater. The by-product wastewater results from our treatment processes for producing
potable drinking water. Zy ),ZA Ce
C
3. (1) Effluent Limitations and Monitoring Requirements has the effluent total residual chlorine
a, limit of 13 µg/L effective on the permit effective date. We are requesting that the limit be
invoked'18 months following the permit effective date and that we be allowed to monitor only
for total residual chlorine commencing on the permit effective date. This will provide us the
opportunity to evaluate our new wastewater treatment facilities and identify if there is a need
for dechlorination treatment.
235 Government Center Drive, Wilmington, NC 28403
t: 910-799-6064 f: 910-799-6066 www.cf ua.or

SWEENEY WTP NPDES PERMIT
DRAFT PERMIT RESPONSE
PAGE Z
4. A. (1) Effluent Limitations and Monitoring Requirements have an effluent total residual chlorine
daily maximum limit of 13.0 µg/L. You indicate in the permit that an effluent total chlorine
residual concentration less than SO µg/L will be treated as zero for compliance purposes.
Discussions with laboratory staff representing other NPDES dischargers indicate that on
occasion chlorine measurements at or below 50 µg/L can be challenging and particularly prone
to interferences. We are concerned whether total chlorine at or below 50 µg/L may be
accurately measured with presently available analytical instrumentation. If we have difficulty
with measurements at or below the SO µg/L level and this concentration cannot be achieved
analytically, will the limit be modified to account for this issue? Z%, Na -"
Ob o--u-rV h ova+.._aAZ1e--6o .t./Z =f- LAIVw -;Z �/
S. (1) Effluent Limitations and Monitoring Requirements has a weekly pH monitoring tc
requirement with a limit of 6.8 — 8.5 SU. This is a new monitoring requirement for our facility
and will require operational modifications including purchase of some equipment. We will
address these modifications during our upcoming construction project to ensure We have
processes and controls in place to maintain pH within the regulated limits. Delaying the
effective date of this permit until the wastewater treatment facilities have been completed will
provide us with the time necessary for installing appropriate controls for meeting the pH
monitoring and limits requirements. , p' slcax�d aA)LQ b-t-
6. A (1) Effluent Limitations and Monitoring Requirements has quarterly monitoring for whole
effluent toxicity. This is a new monitoring requirement for our facility. We have contacted the
supervisor of the DWQ-Aquatic Toxicology Unit who has referred us to several documents for
enhancing our knowledge in this area. The supervisor suggested that we conduct some
monitoring to determine the effect of our wastewater discharge on test organisms. Since we
have no monitoring experience for this particular requirement, we are requesting time to
evaluate our operations in regard to this monitoring requirement. Delaying the effective date of
this permit until the wastewater treatment facilities have been completed will provide us with
t h i s t i m e. � etr� D-A,&-o e c-kx C a.*—
7t..o p n.r s Goa-&e s au a� h.¢lLal a-o& Aa ,.e. L �
7. A. (7) Acute Toxicity Monitoring (Quarterly) instructs us to use parameter code TGE3E on the
discharge monitoring forms (MR-1) for reporting toxicity testing results. This particular
parameter code is unique for one of the three toxicity testing organisms that we are allowed to
use for compliance with the whole effluent toxicity (WET) monitoring requirement. We may
need to use a different parameter code dependent upon the test organism chosen for our
monitoring requirement. 776 C 7i-o
8. A. (1) Effluent Limitations and Monitoring Requirements has fluoride monitoring two times per
month. Fluoride analysis may be performed and reported as total fluoride or as dissolved
fluoride. The total fluoride testing procedure is more costly, creates more waste, and is less safe
for the laboratory technician than the dissolved fluoride testing procedure. Solids .
concentrations in our wastewater discharge are relatively low. We are requesting to monitor
for dissolved fluoride rather than total fluoride,
n._�.�-sue u,�-�.- `� `�'Q� •�

I •
SWEENEY WTP NPDES PERMIT
DRAFT PERMIT RESPONSE
PAGE 3
Thank you for the opportunity to provide comments associated with this draft NPDES permit. Feel free
to contact me with any questions.
Sincerely, V.
Vjt?lai
G'
Bradley V. Jones
Sweeney WTP Supervisor and ORC
Pc: Matt Jordan, General Manager
Mike Richardson, Water Treatment Superintendent
Beth Eckert, Environmental and Safety Management Director
Nancy Gallinaro, Director of Operations
Ed Beck, Surface Water Protection Section, DWQ

re NC0002879. Wilmington Sweeney WTP
Subject: re NC0002879, Wilmington Sweeney WTP
From: [e-mail]
Date: Mon, 16 Jun 2008 10:02:58 -0400
To: [e-mail]
EPA will not be reviewing this permit because it is neither a major or
minor primary facility and does not discharge to a 303 (d) listed water.
of 1 6/16/2008 5:1 1 PM

AFFIDAVIT OF PUBLICATION
STATE OF NORTH CAROLINA
+. :-IUti.'Y OF NEW HANOVER
Before the undersigned. a Notary Public of Said County and State.
"rerrie Millard
Who, being duly sworn or affirmed,according to the law,says that he/she is
Financial Services Manager
of THE STAR-NEWS, a corporation organized and doing business under the Laws of the State of
North Carolina, and publishing a newspaper known as STAR-NEWS in the City of Wilmington
PUBLIC NOTICE STATE OF NORTH CAROLINA ENVIRONMENTAL MAN21GEMENT
COMMISSIONINPDES UNIT 1617 MAIL_SERVICE CENTER RALEIGH, NC 27699-1617
N071FICATION OF INTENT TO ISSUE A NPDES WASTEWATER PERMIT Ott the basis
q/'thorough staff review and application of NC Gen
was inserted in the aforesaid newspaper in space,and on dates as follows:
618 Ix
And at the time of such publication Star-News was a newspaper ince ing all the requirements and
qualifications prescribed by Sec. No. 1-597 G.S.of N.C. [�
bwj�_� C�
Title: Financial Se vices eMan�k%%1i1111//�
affirmed to, and subscribed before me this 000 8-3n0 .��i
S orn or
��U A.D., `oZ00 ``� ti6,y
In'I'estimony Whereof, I have hereunto set my hand and affixed my.;fficial seVy*ay at'=
year aforesaid. rW y6,VLoN Z;
7j`��
O 108 lie
11 11►►��trf�►►
My commission expires 1Z} day of Jc4 20
Upon reading the aforegoing affidavit with the advertisement thereto annexed it is adjudged by the Court that the said
publication was duly and properly made and that the summons has been duly and legally served on the defendant(s).
This day of
Clerk of Superior Court
MAIL TO:

f
r— PUBLIC,NOTICE
STAT'EibF
NORTH CAROLINA
ENVIRONMENTAL; -
MANAGEMENT-
COMMISSION/NPDES UNIT
1617 MAIL SERVICE
CENTER
RALEIGH,NC 27699-1617
NOTIFICATION OF INTENT
TO ISSUE A NPDES
WASTEWATER PERMIT
On the basis of thorough
staff review and applica-
tion of NC General Stat-
ute 143.215.1 and 1SA
NCAC 021-I.0109 and
other lawful standards
and regulations, the
North Carolina Environ-
mental Managemerit
Commission proposes to
issue a National Pollutant
Discharge Elimination
System (NP,DES)t,waste-
water dischar—gevpe--it to
the persons)listed-below
effective r
45 days; from
ie.
the..p6blish;;dat6�of:thisr'
notice: :f'-
Writtei .comments re
garding 'th'e-'proposed
permit will be accepted
until 30 days after the
publish date of this no-
tice. All comments re-
ceived prior to that date
are considered in the fi-
nal determinations re-
garding the proposed j
permit. •The. Director of
the NC Division of Water
Quality may decide to
hold a public meeting for
the proposed permit,
should the Division re-
ceive a significant degree}
of public interest.' '
Copies of the draft permit j
and other supporting in-
formation on file used to F
determine conditions 1
present in the draft per-'
mit are available upon ?
request and payment of
the costs of reproduction.
Mail comments and/or
requests for information
to the NC Division of Wa-
ter Quality at the above
address or call Dina
Sprinkle [phone],
extension 363 at the{
Point Source Branch.
Please include the NPDES
permit number(below) in
any communication. In-
terested persons may
also visit the Division of
Water Quality at 512 N.
Salisbury Street, Raleigh,
NC 27604.1148 between
the hours of 8:00 a,m.
and 5:00 p.m. to review
information on file.
The Cape fear Public Util-
ity.Authority (407 Hilton
Street, Wilmington, NC,
28401)has applied for an
expansion for NPDES
permit ':N00002879 for
the Sweeney;T. P n,New
Hanover County. ijhis
permitted facility,.will:tie
permitted.,'t�o5"di s2lia"rge
4.4z'r'MGDi', ot, treated
wastewater toi_the'Nortt%
east Cape SFe`a,n.River:in
the Cape Fear
Currently total resid-
ual chlorine is water qual-
ity limited. This dis
j charge may affect future
i}I allocations n this portion
of the Cape Fear River
Basin..
i

1Fwd: Draft NPDES Permit NC0002879- Sweeney WTP]
Subject: [Fwd: Draft NPDES Permit NCO002879 - Sweeney WTP]
From: James Mckay<[e-mail]>
Date: Thu, 05 Jun 2008 16:31:37 -0400
To: Toya Fields <toya.fields@ ncmail.net>
Toya,
Please see the attached email.
Jim McKay
Subject: Draft NPDES Permit NCO002879 - Sweeney WTP
From: Kipp Glazier<[e-mail]>
Date: Thu, 05 Jun 2008 15:35:55 -0400
To: James McKay <[e-mail]>
I noticed in the draft permit that the foot note on WET monitoring on the limits page
is 6. But i think it is supposed to refer to footnote 3 .
Kipp Glazier
Environmental Specialist
NC Division of Water Quality
Wilmington Regional Office
phone (910) 796-7336
fax (910) 350-2004
htty //wNrw.ncwaterqualiLX,org/
Draft NPDES Permit NCO002879 - Sweeney WTP.eml Content-Type: messagelrfc822
Content-Encoding: 7bit
1 of 1 6/f 92M8 5:08 PM

RE: Sweeney Water Treatment Plant- NPDES permit modification
Subject: RE: Sweeney Water Treatment Plant- NPDES permit modification
From: "Proffit, Howard K. (Keith)" <[e-mail]>
Date: Fri, 30 May 2008 09:36:48 -0500
To: "Toya Fields" <toya.fields@nc mail.net>
CC: "Mike Richardson/wilm" <[e-mail]>,
<brad.jones @ Wilmingtonne.gov>
Thanks for the information. An excerpt from the EA and the FONSI are
attached for your information. Please consider responses below:
ESTIMATED WW FLOW. The attached PDF excerpt from the EA indicates
anticipated flows with recycle and without recycle. This assumed 10% of
the influent flow is used for backwashing filters and basin solids
wasting. The City typically recycles flow but needs the ability to
discontinue this if the process dictates. The City currently has no
flow limit. They would prefer the established flow limit not be
dependent on recycle even though this is the common practice at this
facility. Therefore we suggest this threshold flow be established as
4.4 MGD. It,is likely that the monthly average will gradually
increase from the 0.5 mgd they are averaging now to 1.5 to 2 mgd as they
approach rated capacity.
ALTERNATIVES. Raw Water is drawn from the Cape Fear River above Lock
AND DAM No. 1. Residual flow streams are a part of the treatment
process to carry away the unacceptable turbity and contaminants in the
Cape Fear River Water. Most of the turbidity and contaminants are
pumped to the Northside WWTP for treatment. The on site clarification
process separates the solids from the water. Much of this residual
water is recycled within the plant. The remainder must be discharged
somewhere and the Northeast Cape Fear River nearby is the logical
recipient. It should be noted that the quality of the residual water
discharged is better -than that in the receiving stream. Other
alternatives include 1) discharging to WWTP, which is not economically
feasible and simply moves the discharge to another point in the river
system or 2) Recycle the increased flow such that the amount discharged
to the stream does not increase. The amount of recycle is limited by
state regulations. Also relying on recycle totally is not practical
from a plant operating standpoint due to process upsets that can occur.
The City needs to maintain their current discharge for the current and
additional flow.
DESCRIPTION OF PROJECT. The project consists of upgrading and expanding
an existing 27. 5 MGD WTP to 44 MGD. The Residuals treatment train is a
small portion of the project and is described in the NPDES Application
Short Form C previously submitted. The WTP process is depicted
schematically in the Process Flow Schematic (NPDES-1) submitted with the
application. The increase in WTP capacity results in an increase in
residuals from the plant and required the addition of one Washwater
Clarifier. The residuals treatment process is being expanded to
construct a new Washwater Flow Equalization Basin to replace an existing
basin that will be demolished, addition of EQ pumps to discharge flow
from the EQ basin to a flow splitter box that will split flow between
the existing and new Washwater Clarifiers. Residuals from the
clarification process will discharge directly to two existing gravity
thickeners. Overflow from the thickeners will discharge to the
clarifiers which will overflow to the Recycle pit and either be recycled
or discharged to NPDES. Solids from the clarifiers will be returned to
the gravity thickeners. Thickened residuals will be pumped from the
gravity thickeners to the Northside WWTP.
Toya - I hope this addresses your questions below. If you require
something more formal or if additional information is needed, please
let me know ASAP. Thanks for your help in working through this process.
1 al'3 6/3/2008 1 1:34 AM

RE: Sweeney Water Treaunent Plant-NPDES permit modification
-----Original Message-----
From: Toya Fields (mailto:toya. [e-mail]]
Sent: Wednesday, May 28, 2008 5:01 PM
To: Proffit, Howard K. (Keith)
Subject: Sweeney Water Treatment Plant-- NPDES permit modification
Hi Keith,
Thanks for speaking with me this afternoon. As we discussed on the
phone, there are a few pieces of information that we need to get before
we can move forward with this permit modification, but I 'm certain we
can get this resolved quickly so that you can move forward with your
project. To summarize:
1) All new or expanding discharges require an FAA (Engineering
Alternatives Analysis) . This is considered an expansion because CFPUA
is proposing to increase the amount of wastewater that is discharged.
The purpose of the FAA is to justify the need for a wastewater discharge
permit and demonstrate that there are no economically or environmentally
feasible alternatives to discharge. This burden becomes much more
straightforward in the case of conventional water treatment plants
because there is no requirement to perform a water quality model, the
flow is justified through the potable water demand, and there are
typically few (if any) alternatives to discharge (particularly for
expansions) . I 've attached a copy of our FAA guidance for your future
reference. Typically we ask that the FAA is wrapped into the SEPA
document (EA) , but it seems that no such request was made before you
received your FONSI last year. Since this project has been in-house
since January, and we need to move forward quickly, I just have a couple
questiohs that will help satisfy our requirements. If you could send me
a written response to these that would be great (email is fine) .
- What is the estimated wastewater flow that we should expect to
see from this expansion? The new permit will have a monthly average
flow limit and we need to pick a reasonable number that won' t be
routinely exceeded. Usually this value is based on plant design. I 've
checked the facility DMRs for the past couple of years and it looks like
the monthly average flow is 0.51 MGD with a maximum monthly average of
1.008 MGD. If we were to increase this value by 63% (amount of proposed
expansion) then we would get a prospective maximum monthly average of
1 . 638 MGD. You should take a look at this value and see how it compares
with your estimates (and take a look at potable water production in
recent years to make this decision) .
- Briefly explain why there are no other alternatives to discharge
for this additional volume of wastewater. We would Like to have this
documented for the file. The attached FAA guidance will give you an
idea of how to address this question. As I mentioned, a brief email
response will suffice.
- Please send me a brief description of this project and the current
wastewater treatment process (expanding the WWTP, expect an increase in
backwash, need to add an additional clarifier, etc. ) Please also
discuss the current recycle process (i .e. how much wastewater is
recycled, etc. )
2) Also, as we discussed on the phone, in September we began
2 of 3 6/3/2008 1 1:34 AM

RE Sweeney Water Treatment Plant-NPDES permit modification
implementing a new permitting strategy for conventional water treatment
plants. I 've attached a document that explains these changes and the
rationale behind them (conventional plants discussed on page 5 and 6) .
The package contains a sample effluent page that will be very similar to
your new permit.
I know much of this has come as a surprise but I think we should be able
to resolve everything and work together to get this permit out quickly.
If you have any questions, please feel free to give me a call .
Thanks,
Toya
Toya Fields - toya. [e-mail]
Environmental Engineer II
Eastern NPDES Program
Division of Water Quality
Tel: [phone] x 551
Fax: [phone]
. .......... ..
I Content-Description: NPDES Docs.PDF
NPDES Does.PDF Content-Type: application/octet-stream
Content-Encoding: base64
........................
Content-Description: M0730430080427555200.pdf
M0730430080427555200.pdf Content-Type: application/octet-stream
Content-Encoding: base64
3 43 6/3/2008 1 1:34 AM

[Fwd: [Fwd: Comments on City of Wilmington WTP Expansion]]
Subject: [Fwd: [Fwd: Comments on City of Wilmington WTP Expansion]]
From: Hannah Stallings <[e-mail]>
Date: Wed, 28 May 2008 10:21:50 -0400
To: Toya Fields <[e-mail]>
-------- Original Message --------
Subject: [Fwd: Comments on City of Wilmington WTP Expansion)
Date: Fri, 21 Sep 2007 14 :39:07 -0400
From: Gil Vinzani <Gil .Vinzani@ncmail .net>
To: hannah Stallings <Hannah.Stallings@ncmail_net>
CC: ron.berry@ncmail .net
Hannah:
From an NPDES perspective, we have no comments regarding the draft Environmental
Assessment for the Sweeney WTP expansion.
Please let me know if you need this copy returned.
Thanks,
Gil
Hannah Stallings
SEPA Coordinator
DWQ - Planning Section
1617 Mail Service Center
Raleigh, NC 27699-1617
p (919) 733-5083, ext. 555 f (919) 715-5637
Subject: Comments on City of Wilmington WTP Expansion
From: Ron Berry <[e-mail]>
Date: Fri, 21 Sep 2007 14:21:23 -0400
To: Gil Vinzani <[e-mail]>
Gil,
I reviewed the Draft FA for the Proposed Sweeney Water Treatment Plant Expansion and
have the following comments.
The EA was very well done and sited many areas. On the mechanical side the expansion
includes demolishing one of the existing plants and then building a new plant in its
place while using the remaining plant to provide treated water. I am not sure how the
supply and demands works with only one plant on line. It is anticipated the newer
technology will yield a higher treatment capacity. I believe they sited at peak
expansion demand the raw water withdrawal from the Kings Bluff Station could be 20%
of the river flow ( check this before you quote me) . I do not recall any changes
being discussed for the NPDES outfall .
Ron
................... .......... . .__,.,.. .. .,_._ _ .. .., .,., .....
Comments on City of Wilmington WTP Expansion.eml.eml Content-Type: rnessagefrfc822
1 of 2 6/6/2008 1 1:04 AM

Calculated Monthly Average Flows
Permit Facility Region Month Day Year Comment Parameter UoM Valve Modifier Celt Type Loc Subbasin
NC0002879 Cape Fear Public Utility Authority-Sweeney WTP Wilmington 1 2004 50050-Flow,in mgd 0.868 CAMONAVG EHI 03-06-17
NCO002879 Cape Fear Public Utility Authority-Sweeney WTP Wilmington 2 2004 50050-Flow,in mgd 0.854 GAMONAVG EHI 03-06-17
NC0002879 Cape Fear Public Utility Authority-Sweeney WTP Wilmington 3 2004 50050-Flaw,in mgd 0.947 GAMONAVG EHI 03-06-17
INC 0002879 Cape Fear Public Utility Authority-Sweeney WTP Wilmington 4 2004 50050-Flow,in mgd 0.861 CAMONAVG Effl 03-06-17
NCO002879 Cape Fear Public Utility Authority-Sweeney WTP Wilmington 5 2G04 50050-Flow,in mgd 0.942 GAMONAVG EHI 03-06-17
NCO002879 Cape Fear Public Utility Authority-Sweeney WTP Wilmington 6 2004 50050-Flow,in mgd 1.006 CAMONAVG EfH 03-06-17
NC0002879 Cape Fear Public Utility Authority-Sweeney WTP Wilmington 7 2004 50050-Flow,in mgd 0.952 GAMONAVG EHI 03-06-17
N00002679 Cape Fear Public Utility Authority-Sweeney WTP Wilmington B 1 2004 50050-Flow,in mgd 0.985 CAMONAVG EHI 03-06-17
NC0002879 Cape Fear Public Utility Authority-Sweeney WTP Wilmington 9 2004 50050-Flow,in mgd 0.923 CAMQNAVG EHI 03-05-17
NC0002879 Cape Fear Public Utility Authority-Sweeney WTP Wilmington 10 2004 50050-Flow,in mgd 0.957 CAMONAVG EHI 03-06-17
NCO002879 Cape Fear Public Utility Authority-Sweeney WTP Wilmington 11 2004 5OG50-Flow,in mgd 0.948 CAMQNAVG EHI 03-06-17
NCO002879 Cape Fear Public Utility Authority-Sweeney WTP Wilmington 12 20041 50050-Flow,in mgd 0.833 CAMONAVG Etfi 03-06-17
NCO002879 Cape Fear Public Utility Authority-Sweeney WTP Wilmington 1 2005 50050-Flow,in mgd 0.856 CAMONAVG Effl 03.06.17
NC0002879 Cape Fear Public Utility Authority-Sweeney WTP Wilmington 2 2005 50050-Row,in mgd 0.832 CAMQNAVG EHl 03-06-17
NC0002879 Cape Fear Public Utility Authority-Sweeney WTP Wilmington 3 2005 50050-Flow,in mgd 0J47194 CAMQNAVG Effl 03-06-17
NC0002879 Gape Fear Public Utility Avthority-Sweeney WTP Wilmington 4 2005 50050-Flow,in mgd 0.428967 CAMQNAVG CHI 03-06.17
NC0002879 Cape Fear Public Utility Authority-Sweeney WTP Wilmington 5 2005 50050-Flow,in mgd 0.288871 CAMONAVG EHI 03-06-17
NC0002879 Cape Fear Public Utility Authority-Sweeney WTP Wilmington 6 2005 50050-Flaw,in mgd 0,185933 CAMQNAVG EHi 03-06-17
N00002879 Cape Fear Public Utility Authority-Sweeney WTP Wilmington 7 2005 50050-Flow,in mgd 0,231742 GAMONAVG Effl 03-06-17
NC0002879 Cape Fear Public Utility Authority-Sweeney WTP Wilmington 8 2005 50050-Flow,in mgd 0.249323 CAMONAVG Effl 03-06-17
NC0002879 Cape Fear Public Utility Authority-Sweeney WTP Wilmington 9 2005 50050-Flow,in mgd 0.279833 GAMONAVG EHI 03-06-17
NC0002879 Cape Fear Public Utility Authority-Sweeney WTP Wilmington 10 2005 50050•Flaw,in mgd 0.277323 CAMQNAVG EfH 03-06-17
N00002879 Cape Fear Public Utility Authority-Sweeney WTP Wilmington 11 2005 50050-Flow,in mgd 0.2369 GAMONAVG Ill 03-06-17
NC0002879 Gape Fear Public Utility Authority-Sweeney WTP Wilmington 12 2005 50050-Flow,in mgd 0.251606 CAMQNAVG Effl 03-06-17
NG0002879 Gape Fear Public Utility Authority-Sweeney WTP Wilmington 1 2006 50050-Flow,in mgd 0.199258 CAMONAVG Effl 03-06-17
NCO002879 Cape Fear Public Utility Authority-Sweeney WTP Wilmington 2 2006 50050-Flow,in mgd 0.482679 CAMONAVG EHI 03-06-17
NC0002879 Cape Fear Public Utility Authority-Sweeney WTP Wilmington 3 2006 50050-Flow,in mgd 0.365226 CAMQNAVG EHI 03-06-17
NCO002879 Cape Fear Public Utility Authority-Sweeney WTP Wilmington 4 2006 50050-Flow,in mgd 0.383067 CAMQNAVG EHI 03-06-17
N00002879 Cape Fear Public Utility Authority-Sweeney WTP Wilmington 5 2006 50050-Flow,in mgd 0.284645 CAMONAVG Effl 03-06-17
NCO002879 Cape Fear Public Utility Authority-Sweeney WTP Wilmington 6 2006 50050-Flow,in mgd 0,2501 GAMONAVG Eftl 03-06-17
NG0002879 Gape Fear Public Utility Authority-Sweeney WTP Wilmington 7 2006 50050-Flow,in mgd 0.40529 CAMONAVG EHI 03-06-17
NC0002879 Cape Fear Public Utility Authority-Sweeney WTP Wilmington 8 2006 50050-Flaw,in mgd 0.401484 GAMONAVG EHI 03-06-17
N00002879 Cape Fear Public Utility Authority-Sweeney WTP Wilmington 9 2006 50050-Flow,in mgd 0.4421 CAMONAVG EHI 03-06-17
NCO002879 Cape Fear Public Utility Authority-Sweeney WTP Wilmington 10 2006 50050-Flow,in mgd 0.292355 CAMQNAVG Effl 03-06-17
N00002879 Cape Fear Public Utility Authority-Sweeney WTP Wilmington 11 2006 50050-Flow,in mgd 0.240867 CAMONAVG Effl 03-06-17
NC0002879 Cape Fear Public Utility Authority-Sweeney WTP Wilmington 12 2006 50050-Flow,in mgd 0.31 CAMQNAVG EHI 03-06-17
NC0002879 Cape Fear Public Utility Authority-Sweeney WTP Wilmington 1 2007 50050-Flow,in mgd 0.53429 CAMQNAVG EHl 03-06-17
NC0002879 Cape Fear Public Utility Authority-Sweeney WTP Wilmington 2 2007 50050-Flow,in mgd 0.479071 CAMQNAVG Ettl 03-06-17
NG0002879 Cape Fear Public Utility Authority-Sweeney WTP Wilmington 3 2007 50050-Flaw,in mgd 0.3883871 CAMONAVG ENt 03-06-17

Calculated Monthly Average Flaws
NCO002879 Cape Fear Public Utility Authority-Sweeney WTP Wilmington 4 2007'i 50050-Flow,in mgd 0.391033 CAMONAVG Effl 03-06-17
NCO002879 Cape Fear Public Utility Authority-Sweeney WTP Wilmington 5 2007 50050-Flowjn mgd 0.402 CAMONAVG E81 03-06-17
NC0002879 Cape Fear Public Utility Authority-Sweeney WTP Wilmington 6 2007 50050-Flow,in mgd 0.390333 CAMONAVG Effl 03.06-17
NC0002879 Cape Fear Public Utility Authority-Sweeney WTP Wilmington 7 2007 50050-Flow,in mgd 0.447161 CAMONAVG EHI 03-06-17
NC0002879 Cape Fear Public Utility Authority-Sweeney WTP. Wilmington 8 2007 50050-Flow,in mgd 0.424161 CAMONAVG EHI 03-06-17
NC0002879 Cape Fear Public Utility Authority-Sweeney WTP Wilmington 9 2007 50050-Flow,in mgd 0.356433 CAMONAVG Efll 03-06-17
NC0002879 Cape Fear Public Utility Authority-Sweeney WTP Wilmington 10 2007 50050-Flow,in mgd 0.401645 CAMONAVG EHI 03-06-17
NC0002879 Cape Fear Public Utility Authority-Sweeney WTP Wilmington 11 2007 50050-Flow,in mgd 0.366767 CAMONAVG DIL 03-06-17
NG0002879 Cape Fear Public Utility Authority-Sweeney WTP Wilmington 12 2007 50050-Flow,in mgd 0.369806 CAMONAVG DIL 03-06-17
NCO002879 Cape Fear Public Utility Authority-Sweeney WTP Wilmington 1 2008 50050-Flow,in mgd 0,308194 CAMONAVG Effi 03-06-17
NCO002879 Cape Fear Public Utility Authority-Sweeney WTP Wilmington 2 2008 50050-Flow,in mgd 0.365586 CAMONAVG Effl 03.06-17
NC0002879 Cape Fear Public Utility Authority-Sweeney WTP Wilmington 3 2008 50050-Flow,in mgd 0.377419 CAMONAVG Effl 03-06-17
max 1.008
min 0.18593
avg 0.51026
95th% 0.9545
90th% 0.942
current design(MGD) 27,5
proposed peak design(MGD) 44
increase 0.625
estimated future max monthly avg,ilow 1.638

A K
CAVANAU G H
Sohitions through integrity and partnership
December 28,2007 Via Regular Mail
North Carolina Department of
Environment and Natural Resources
Division of Water Quality—NPDES Unit
1617 Mail Service Center
Raleigh,North Carolina 17699 JAN. 1 1 20Q8
Re: NPDES Permit Number NC0002879 Modification
Sweeney Water Treatment Plant DEMR - WATER QUALITY
POINT SOU zCE EIPO ICH
New Hanover County,City of Wilmington - -- ---
Dear NC DENR Representative,
Pursuant to our discussions in regards to the above referenced permit with Jim
McKay,enclosed with this correspondence please find the following items
constituting our application for a modification to the NPDES Permit for the above
referenced site,specifically identified as the Sweeney Water Treatment Plant.
To facilitate your review of the enclosed documentation,the following is an itemized
breakdown: /
1. One(1)Executed NPDES Permit Application—Short Form C and the ✓ �,ru��
associated"Process Flow Schematic'. / r'
2. A fee in the amount of$1,030 made payable to `NC DEMR' to satisfy
application fee.
3. One(1)set of the Construction Documents for the subject project.
4. One(1)copy of the specifications for construction of the subject site.
As discussed with Jim McKay,the project will upgrade the existing water treatment
facility to provide more treatment capacity for the plant from 27.5 million gallons per
day to 35 million gallons per day with a peak operation of 44 million gallons per day.
It is important to note that the solids will be pumped to the waste water treatment
plant for treatment and the clarified water minus the recycled water will be discharged
to the NPDES point in accordance with the approved permit limitations. An
additional clarifier is proposed to handle the additional flow with the overall process
to remain the same. It is important to note that the site will meet the current NPDES
permit limits in regards to concentration of suspended solids as identified in Section
A.1. of the existing permit.
In summation, and as discussed,the upgrades to the plant should not affect the current
NPDES permit limits and this correspondence and application are being submitted as

cor irmation of such. It is important that the overall function of the plant remain the
same and discharge limits will remain identical.
Please note that an `Engineering Alternatives Analysis' has not been included as
based on Short Form `C', this is only required of new applicants. In addition,the
solids handling plan is to pump the solids to the Northside W WTP for treatment.
Should you have any questions or require additional information,please don't hesitate
to contact the undersigned.
Very truly yours,
CAVANAUGH&ASSOCITES, P.A.
Eric S. Tomczak, P.E.
Cc: Jim McKay
Keith Proffit
Mackenzie Boyer
Lisa Manning
Joe Brown., City of Wilmington

NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
Mail the complete application to:
N. C. Department of Environment and Natural Resources
Division of Water Quality / NPDES Unit
1617 Mail Service Center, Raleigh, NC 27699-1617
NPDES Permit Number NC0002879
If you are completing this form in computer use the TAB key or the up - down arrows to move from one
field to the next. To check the boxes, click your mouse on top of the box. Otherwise, please print or type.
1. Contact Information:
Owner Name The City of Wilmington
Facility Name Sweeney Water Treatment Plant
Mailing Address 102 North Third Street
City Wilmington
State / Zip Code NC / 28401
Telephone Number [phone]
Fax Number [phone]
e-mail Address Mike.RichardsonuNvilmingtonnc.gov
2. Location of facility producing discharge:
Check here if same as above ❑
Street Address or State Road 407 Hilton Street
City Wilmington
State / Zip Code NC / 28401
County New Hanover
3. Operator Information:
Name of the firm, consultant or other entity that operates the facility. (Note that this is not referring to the
Operator in Responsible Charge or ORC)
Name City of Wilmington Sweeney WTP Staff
Mailing Address 407 Hilton Street
City Wilmington
State / Zip Code NC / 28401
Telephone Number (910) 343--3690
Fax Number [phone]
4. Ownership Status:
Federal ❑ State ❑ Private ❑ Public
Page l of 4 C-%V'['k'03105

NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
5. Type of treatment plant:
® Conventional (Includes coagulation, flocculation, and sedimentation, usually followed by
filtration and disinfection)
❑ Ion Exchange (Sodium Cycle Cationic ion exchange)
❑ Green Sand Filter (No sodium recharge)
❑ Membrane Technology (RO, nanofiltration)
Check here if the treatment process also uses a water softener ❑
6. Description of source water(s) fi.e. groundwater, surface water)
Smith Creek (Cape Fear River)
7. Describe the treatment process(es) for the raw water:
Preozonation > Coagulation > Hi rate Clarification (Superpulsators) > Intermediate
Ozonation (for disinfection) > Filtration (Biological filters) > UV Disinfection
8. Describe the wastewater and the treatment process(es) for wastewater generated by the
facility:
The clarification process produces residuals (basically solids in the raw water along with
coagulation chemicals (alum and polymer) that are sent to coagulation process (polymer
added) ahead of the splitter box and then to two gravity thickeners. Residuals from the
gravity thickeners are pumped to the Northside WWTP and supernatant from the gravity
thickeners is returned to the Washwater Equalization Basin.
Clarifier Residuals > Coagulation (polymer added) > GT Thickener Splitter box > Gravity
Thickeners >
Residuals to Residuals Pumps > Northside WWTP
Supernatant/overflow to Washwater Equalization Basin
Filter Backwash water along with the supernatant from the gravity thickeners is stored in
the Washwater Equalization Basin and pumped from there to a splitter box ahead of two
clarifiers. Residuals from the clarifiers are returned to the gravity thickeners and
clarified effluent is piped to a distribution weir box. A portion of the flow is pumped from
this weir box to the head of the WTP for recylcing and the remainder is discharged to the
NPDES permit discharge point in the Northeast Cape Fear River.
Filter WW and Gravity Thickener Supernatant > Washwater Equalization Basin >
Washwater Eq Pumps > Clarifier splitter box > Clarifiers >
Effluent to Recycle/NPDES discharge or
Residuals to Gravity thickener Splitter Box
9. Number of separate discharge points: I
Outfall Identification number(s) 001
10. Frequency of discharge: Continuous ® Intermittent ❑
If intermittent:
Days per week discharge occurs: Duration:
Page 2 of 4 C-WT'P 03/05

NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
11. Plant design potable flowrate 35 MGD
Backwash or reject flow 0.6 MGD
12. Name of receiving stream(s) (Provide a map showing the exact location of each outfall, including
latitude and longitude):
See Attached Map. Northeast Cape Fear River
13. Please list all water treatment additives, including cleaning chemicals or disinfection
treatments, that have the potential to be discharged.
Aluminum Sulfate
Cationic Polymer
Sodium Hydroxide
Calcium Thiosulfate
Sodium Hypochlorite
Fluoride
Poly phosphate
14. Is this facility located on Indian country? (check one)
Yes ❑ No
15. Additional Information:
Provide a schematic of flow through the facility, include flow volumes at all points in
the treatment process, and point of addition of chemicals.
Solids Handling Plan
16. NEW Applicants
Information needed in addition to items I-I5:
New applicants must contact a permit coordinator with the NCDENR Customer
Service Center.
Was the Customer Service Center contacted? ❑ Yes ® No
Analyses of source water collected
Engineering Alternative Analysis
Discharges from Ion Exchange and Reverse Osmosis plants shall be evaluated using a
water quality model.
17. Applicant Certification
Page 3 of 4 C-W'1'13 03105

NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
I certify that I am familiar with the information contained in the application and that to the
best of my knowledge and belief such information is true, complete, and accurate.
Y. �IDn�S SW w 1 T Su ✓�Spr'
Print d name of,`Person Signing Tit e
V•
S ature o Applic to
[North Carolina General Statute 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 $25,000, or by imprisonment not to exceed six months, or by both. (18 U.S.G. Section
1001 provides a punishment by a fine of not more than $25,000 or imprisonment not more than 5 years, or both,
for a similar offense.)
Page 4 of 4 C-WTP 03/05