NC0043532_Permit (Issuance)_20091229

NPDES DOCUMENT SCANNING COVER SHEET
NPDES Permit:
NC0043532
West Stanly / Oakboro WWTP
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Correspondence
Owner Name Change
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
December 29, 2009
This document is printed on reuse paper - ighnore any
content on the resrerse side

A
NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins Dee Freeman
Governor Director Secretary
December 29, 2009
The Honorable Joyce H. Little, Mayor
Town of Oakboro
109-A N. Main Street
P.O. Box 610
Oakboro, North Carolina 28129
Subject: NPDES Permit Issuance
Permit NC0043532
Oakboro WWTP
Stanly County
Dear Mayor Little:
In accordance with the application for discharge permit received, the Division is forwarding herewith the
subject NPDES 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).
The final permit authorizes the Town of Oakboro to discharge wastewater from the Oakboro WWTP to
the Rocky River (outfall 002) and Long Creek (as emergency backup only to outfall 001), class C waters in
the Yadkin -Pee Dee River Basin. The permit includes discharge limitations/or monitoring for flow, BOD5,
ammonia nitrogen, total suspended solids (TSS), dissolved oxygen, total residual chlorine, fecal coliform,
copper and zinc.
The Rocky River is not listed on the current North Carolina 303(d) list for impaired streams. However, it
may be listed as an impaired stream on the draft 2008 303 (d) list. That listing will indicate that the stream
does not meet all water quality standards. If the limitations in the current permits for facilities discharging to
Rocky River do not result in improved water quality, removal of discharges to the Rocky River may be
necessary for the health of the stream.
Although the Division believes land clearing and stormwater runoff are the main causes of degradation to
the Rocky River, we will continue to monitor compliance at your facility. If noncompliance with your permit's
effluent limits is shown to be a direct cause of stream degradation, the Division will recommend removal of
your facility's discharge.
Part III of your permit requires you to "continually evaluate all wastewater disposal alternatives and
pursue the most environmentally sound alternative of the reasonably cost effective alternatives" to surface
water discharge. Such an evaluation may help you find an alternative to surface water discharge that is more
appropriate for your facility.
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
Location: 512 N. Salisbury St. Raleigh, North Carolina 27604
Phone: [phone] FAX: [phone] Customer Service: 1-877-623-6748
Internet: www.ncwaterquality.org
•
An Equal opportunity 1 Alfirmative Action Employer
NO�e Carolina
�turally

Letter to Mayor Little
Page 2
The following procedure has been implemented by DWQ: Total residual chlorine (TRC) compliance
level changed to 50 ug/l. Effective March 1, 2008, the Division received EPA approval to allow a 50 ug/1
TRC compliance level. This change is due to analytical difficulties with TRC measurements. Facilities will
still be required to report actual results on their monthly discharge monitoring report (DMR) submittals,
but for compliance purposes, all TRC values below 50 ug/1 will be treated as zero. Additional information
has been added to a footnote regarding this change on the effluent limitations page.
The following modifications are included in the final permit.
• The effluent limit for total lead (at outfall 001 - Long Creek) has been removed from the permit.
The results of an analysis on submitted data indicated that there would be no reasonable
potential to exceed the stream's water quality standard. There will be no monitoring
requirement for lead in the permit.
• Quarterly monitoring for total zinc has been added to the permit. An analysis on submitted
data indicated a reasonable potential that the water quality action level standard for zinc could
be violated in the receiving stream. Quarterly monitoring allows minimal sampling but will
provide enough data for evaluation at the next permit renewal.
• There has been some modification of the treatment plant components on the supplement to
permit cover sheet. Please review this description for correctness.
• Please note that there have been minor language changes and the addition of a new paragraph
regarding data submittal in special conditions A.3. and A.4. Chronic Toxicity permit 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 a demand is made, this permit
shall be final and binding.
Please take notice that this permit is not transferable. The Division may require modification 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, Coastal Area Management Act, or any other Federal or Local governmental permits may be
required.
If you have any questions or need additional information, please contact Jacquelyn Nowell at telephone
number [phone].
Sin
Attachments
cc: NPDES File/NC0043532
Mooresville Regional Office/Surface Water Protection Section (ecopy)
Aquatic Toxicity Unit (ecopy)
Technical Assistance and Certification Unit/Attn: Steve Reid (ecopy)
Central Files
ESS/Carrie Ruhlman (ecopy)
rely,
een H. Sullins

NC0043532
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 Town of Oakboro
is hereby authorized to discharge wastewater from a facility located at the
Oakboro Wastewater Treatment Plant
Off of NCSR 1953
East of Oakboro
Stanly County
to receiving waters designated as the Rocky River (outfall 002) and Long Creek (outfall
001) in the Yadkin - Pee Dee 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 February 1, 2010.
This permit and authorization to discharge shall expire at midnight January 31, 2014
Signed this day December 29, 2009.
en H. Sullins, Director
vision of Water Quality
By Authority of the Environmental Management Commission

NC004353!
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 Towri of Oakboro is hereby authorized to:
1. Continue to operate a 0.90 MGD wastewater treatment plant consisting of the
following components:
• Manual bar screen
• Step screen system
• Aerated grit chamber
• Instrumented flow measurement
• Aeration basin with mechanical aerators
• Three secondary clarifiers
• Clarifier splitter box with adjustable weirs
• Chlorine contact basin with dechlorination unit
• Aerobic sludge digester with two floating aerators, one floating mixer, a floating
decant mechanism, and additional pumps
• Two aerated sludge holding basins
• Dual sludge drying beds (not in use)
• Dual standby electric generators
The facility is located at the Town of Oakboro WWTP, off of NCSR 1953, east of
Oakboro, Stanly County.
2. Continue to discharge from said treatment works at the locations specified on the
attached map into Rocky River (002) and Long Creek (emergency outfall 001). Both
locations are classified C waters in the Yadkin -Pee Dee River Basin.

Town of Oakboro WWTP
- NC0043532
USGS Quad Name: Oakboro
Receiving Streann Rocky River; Long Creek
Stream Class: C
Subbasin: Yadkin — 03-07-14; 03-07-13
002 [Rocky River]
Latitude: 35°12'41"
Longitude: 80°15'16"
001 [Long Creek]
Latitude: 35°14'08"
Longitude: 80°16'00"
Facility
Location
NOt to SCALE

NC0043532
A. (1) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS -FINAL
During the period beginning on the effective date of the permit and lasting until expiration, the Permittee
is authorized to discharge from outfall serial number 002 (Rocky River). Such discharges shall be limited
and monitored by the Permittee as svecified below:
EFFLUENT
LIMITS
MONITORING REQUIREMENTS
CHARACTERISTICS
•
Monthly
Average
Weekly
Daily
Maximum
Measurement
Frequency _
Sample
Type
Sample
Location1
Flow
0.9 MGD
,Average
Continuous
Recording
I or E
BOD, 5 day, 20°C2
(Summer)
9.0 mg/1
13.5 mg/1
3/week
Composite
E, I
BOD, 5 day, 20°CZ
(Winter)
18.0 mg/L
27.0 mg/L
3/week
Composite
E, I
Total Suspended Solids2
30.0 mg/1
45.0 mg/1
3/week
Composite
E, I
NH3 as N (Summer)
3.0 mg/1
9.0 mg/L
3/week
Composite
E
NH3 as N (Winter)
6.0 mg/1
18.0 mg/L
3/week
Composite
E
Dissolved Oxygen3
3/week
Grab
E, U, D
pH4
3/week
Grab
E
Fecal Coliform
(geometric mean)
200 / 100 ml
400 / 100 ml
3/week
Grab
E, U, D
Total Residual Chlorines
28 µg/L
3/week
Grab
E
Total Nitrogen
(NO2 + NO3 + TKN)
Quarterly
Composite
E
Total Phosphorus
Quarterly
Composite
E
Temperature °C
Daily
Grab
E
Temperature °C
3/week
Grab
U, D
Conductivity
3/week
Grab
U, D
Chronic Toxicity6
Quarterly
Composite
E
Total Copper
2/Month
Composite
E
Total Zinc
Quarterly
Composite
E
Notes:
1.
Sample locations: E - Effluent, I - Influent, U - Upstream at least 100 feet above the discharge point, D -
Downstream below the discharge point at NCSR 1917. Instream monitoring requirements are waived
as long as the facility retains membership in the YPDRBA. If membership is cancelled, facility will
monitor 3/week during the months of June through September and once per week during the
remaining months of the year.
2. The monthly average effluent BOD5 and TSS concentrations shall not exceed 15% of the respective
influent value (85% removal).
3. The daily average dissolved oxygen effluent concentration shall not be less than 5.0 mg/1.
4. The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
5. The Division shall consider all effluent total residual chlorine values reported below 50 µg/1 to be in
compliance with the permit. However, the Permittee shall continue to record and submit all values
reported by a North Carolina certified laboratory (including field certified), even if these values fall
below 50 µg/1.
6. Chronic Toxicity (Ceriodaphnia) P/F at 4.6%; January, April, July, and October; See Special Condition
A (3) of the Supplement to Effluent Limitations.
Summer. April 1- October 31
Winter: November 1- March 31
There shall be no discharge of floating solids or foam visible in other than trace amounts.

NC0043532 ,
A.(2) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS -FINAL
During the period beginning on the effective date of the permit and lasting until expiration, the Permittee
is authorized to discharge from emergency backup outfall serial number 001 (Long Creek) in case of a
pump station failure. Such discharges shall be limited and monitored by the Permittee as specified below:
EFFLUENT
CHARACTERISTICS
LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Weekly
Average
Daily ,
Maximum
Measurement
Frequency
Sample
Type
Sample
Locations
Flow
0.9 MGD
Continuous
Recording
I or E
,Flow
5 day, 20°C2
(Summer)
9.0 mg/1
13.5 mg/1
3/week
Composite
E, I
BOD, 5 day, 20°C2
(Winter)
18.0 mg/1
27.0 mg/1
3/week
Composite
E, I
Total Suspended Solids2
30.0 mg/1
45.0 mg/1
3/week
Composite
E, I
NH3 as N (Summer)
2.8 mg/1
8.4 mg/L
3/week
Composite
E
NH3 as N (Winter)
6.0 mg/1
18.0 mg/L
3/week
Composite
E
Dissolved Oxygen3
3/week
Grab
E, U, D
pH4
3/week '
Grab
E
Fecal Coliform
(geometric mean)
200 / 100 ml
400 / 100 ml
3/week
Grab
E, U, D
Total Residual Chlorines
28 µg/1
3/week
Grab
E
Total Nitrogen
(NO2 + NO3 + TKN)
Quarterly
Composite
E
Total Phosphorus
Quarterly
Composite
E
Temperature °C
Daily
Grab
E
Temperature °C
3/week
Grab
U, D
Conductivity
3/week
Grab
U, D
Chronic Toxicity5
Quarterly
Composite
E
Total Copper
2/Month
Composite
E
Total Zinc
Quarterly
Composite
E
Notes:
1.
Sample locations: E - Effluent, I - Influent, U - Upstream at least 100 feet above the discharge point, D -
Downstream 1.7 miles below the discharge point (at the end of or close to NCSR 1659). Instream
monitoring requirements are waived as long as the facility retains membership in the YPDRBA. If
membership is cancelled, facility will monitor 3/week during the months of June through September
and once per week during the remaining months of the year.
2. The monthly average effluent BODS and TSS concentrations shall not exceed 15% of the respective
influent value (85% removal).
3. The daily average dissolved oxygen effluent concentration shall not be less than 5.0 mg/1.
4. The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
5. The Division shall consider all effluent total residual chlorine values reported below 50 µg/1 to be in
compliance with the permit. However, the Permittee shall continue to record and submit all values
reported by a North Carolina certified laboratory (including field certified), even if these values fall
below 50 µg/1.
6. Chronic Toxicity (Ceriodaphnia) P/F at 30%; January, April, July, and October; See Special Condition A
(4) of the Supplement to Effluent Limitations.
Summer. April 1- October 31
Winter. November 1— March 31
There shall be no discharge of floating solids or foam visible in other than trace amounts.

NC0043532
SUPPLEMENT TO EFFLUENT LIMITATIONS
AND MONITORING REQUIREMENTS
SPECIAL CONDITIONS
A (3). CHRONIC TOXICITY PERMIT LIMIT (QRTRLY) @ Rocky River
The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality to
Ceriodaphnia dubia at an effluent concentration of 4.6%.
The permit holder shall perform at a minimum, quarterlu monitoring using test procedures outlined in the "North
Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised February 1998, or subsequent versions or
"North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised -February 1998) or subsequent
versions. The tests will be performed during the months of January, April, July, and October. Effluent sampling for
this testing shall be performed at the NPDES permitted final effluent discharge below all treatment processes.
If the test procedure performed as the first test of any single quarter results in a failure or ChV below the permit
limit, then multiple -concentration testing shall be performed at a minimum, in each of the two following months as
described in "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised -February 1998) or
subsequent versions.
The chronic value for multiple concentration tests will be determined using the geometric mean of the highest
concentration having no detectable impairment of reproduction or survival and the lowest concentration that does
have a detectable impairment of reproduction or survival. The definition of "detectable impairment," collection
methods, exposure regimes, and further statistical methods are specified in the "North Carolina Phase II Chronic
Whole Effluent Toxicity Test Procedure" (Revised -February 1998) or subsequent versions.
All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge
Monitoring Form (MR-1) for the months in which tests were performed. If reporting pass/fail results using the
parameter code TGP3B, DWQ Form AT-1 (original) is sent to the below address. If reporting Chronic Value results
using the parameter code THP3B, DWQ Form AT-3 (original) is to be sent to the following address:
Attention: Environmental Sciences Section
North Carolina Division of Water Quality
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, accurate, include all supporting chemical/physical measurements and all
concentration/response data, and be certified by laboratory supervisor and ORC or approved designate signature.
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, monitoring will be
required during the following month. Should any test data from this monitoring requirement 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, minimum control organism reproduction, 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.

NC0043532
SUPPLEMENT TO EFFLUENT LIMITATIONS
AND MONITORING REQUIREMENTS
SPECIAL CONDITIONS
A (4). CHRONIC TOXICITY PERMIT LIMIT (QRTRLY) @ Long Creek
The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality to
Ceriodaphnia dubia at an effluent concentration of 30%.
The permit holder shall perform at a minimum, quarterly monitoring using test procedures outlined in the "North
Carolina Ceriodaphnta Chronic Effluent Bioassay Procedure," Revised February 1998, or subsequent versions or
"North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised -February 1998) or subsequent
versions. The tests will be performed during the months of January, April, July, and October. Effluent sampling for
this testing shall be performed at the NPDES permitted final effluent discharge below all treatment processes.
If the test procedure performed as the first test of any single quarter results in a failure or ChV below the permit
limit, then multiple -concentration testing shall be performed at a minimum, in each of the two following months as
described in "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised -February 1998) or
subsequent versions.
The chronic value for multiple concentration tests will be determined using the geometric mean of the highest
concentration having no detectable impairment of reproduction or survival and the lowest concentration that does
have a detectable impairment of reproduction or survival. The definition of "detectable impairment," collection
methods, exposure regimes, and further statistical methods are specified in the "North Carolina Phase II Chronic
Whole Effluent Toxicity Test Procedure" (Revised -February 1998) or subsequent versions.
All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge
Monitoring Form (MR-1) for the months in which tests were performed. If reporting pass/fail results using the
parameter code TGP3B, DWQ Form AT-1 (original) is sent to the below address. If reporting Chronic Value results
using the parameter code THP3B, DWQ Form AT-3 (original) is to be sent to the following address:
Attention: Environmental Sciences Section
North Carolina Division of Water Quality
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, accurate, include all supporting chemical/physical measurements and all
concentration/response data, and be certified by laboratory supervisor and ORC or approved designate signature.
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, monitoring will be
required during the following month. Should any test data from this monitoring requirement 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, minimum control organism reproduction, 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.

North Carolina ) ss
Mecklenburg County)
The Charlotte Observer Publishing Co.
Charlotte, NC
Affidavit of Publication
THE CHARLOTTE OBSERVER
DINA SPRINKLE
NCDENR/DWQ/POINT SOURCE BRANCH
1617 MAIL SERVICE CENTER
RALEIGH NC 27699
REFERENCE: 30063432
6401010 NPDES Wastewater Per
Before the undersigned, a Notary Public of said
County and State, duly authorized to administer
oaths affirmations, etc., personally appeared,
being duly sworn or affirmed according to law,
doth depose and say that he/she is a
representative of The Charlotte Observer
Publishing Company, a corporation organized and
doing business under the laws of the State of
Delaware, and publishing a newspaper known as The
Charlotte Observer in the city of Charlotte,
County of Mecklenburg, and State of North Carolina
and that as such he/she is familiar with the
books, records, files, and business of said
Corporation and by reference to the files of said
publication, the attached advertisement was
inserted. The following is correctly copied from
the books and files of the aforesaid Corporation
and Publication.
PUBLISHED ON: 10/23
AD SPACE:
FILED ON:
NAME:
O//-4 TITLE:
DATE:
In Testimony Whereof I have hereunto set my han
day and year aforesaid.
Nota
70 LINE
10/30/09✓
irrrga f4
Aolik/YA
Public Notice
North Carolina Environmental
Management Commission/NPDES Unit
1617 Mail Service Center
Raleigh, NC 9-1617
Notice of Intent to Issue a NPDES Wastewater Permit
The North Carolina Environmental Management Commission
proposes to issue a NPDES wastewater discharge permit to the
person(s) listed below.
Written comments regarding the proposed permit will be
accepted until 30 days after the publish date of this notice. The
Director of the NC Division of Water Quality (DWQ) may hold a
public hearing should there be a significant degree of public
interest. Please mail comments and/or information requests to
DWQ at the above address. Interested persons may visit the DWQ
at 512 N. Salisbury Street, Raleigh, NC to reviow information on
file. Additional information on NPDES permits and this notice may
be found on our webslte: www.ncwaterqualily.org, or by calling
[phone].
The Town of Oakboro requested renewal of permit NC0043532 for
Oakboro WWTP in Slanly County. This permitted discharge is
treated domestic wastewater to Rocky River, Yadkin -Pee Dee
River Basin.
The City of Hamlet requested renewal of permit NC0047562 for
Hamlet WWTP in Richmond County. This permitted discharge is
treated domestic wastewater to Marks Creek, Vactkin•Pee Dee
River Basin.
Huffman Finishing. Inc., has applied for renewal o1 its permit
NC0025135 discharging treated industrial wastewater to the
Catawba River In the Catawba River Basin.
LP640t010
nd affixed my seal, the
My Commission Expires May 17, 2011
y Commission Expires: _/_/_

NCDENR/DWQ
FACT SHEET FOR NPDES PERMIT DEVELOPMENT
Town of Oakboro WWTP
Facility Information
(1.) Facility Name:
Oakboro WWTP
(2.) Permitted Flow MGD :
(3.) Facility Class:
3 0.9 I 6. County:
III 1 (7.) Regional Office:
Stanly
Mooresville
(4.) Pretreatment Program:
: Inactive since 3/2001 7 (8.) USGS Topo Quad:
G17NE
(5.) Permit Status:
Renewal 1 (9.) USGS Quad Name:
Oakboro, NC
Stream Characteristics
(1.) Receiving Stream:
! Rocky River, Long Creek
(7.) Drainage Area (mi2):
965; 192.5
(2.) Sub -basin:
03-07-14, 03-07-13
(8.) Summer 7Q10 (cfs):
29; 3.3
(3.) Stream Index Number:
(9.) Winter 7Q10 (cfs):
51; 5.8
(4.) Stream Classification:
' C
(10.) 30Q2 (cfs):
(5.) 303(d) Status:
Not Listed -2006
Listed in NC Draft 2008
(11.) Average Flow (cfs):
920; 183
(6.) 305(b) Status:
I (12.) IWC %:
4.59; 29.71
1.0 Proposed Changes Incorporated into Permit Renewal
• No portions of the Rocky River lie within sub -basin 03-07-13. Outfall 002 falls within
sub -basin 03-07-14. Outfall 001 has been properly characterized as being within sub -
basin 03-07-13.
• Expiration date changed to January 31, 2014.
• Remove lead limit/ monitoring requirements for outfall 001 - Long Creek due to lack of
reasonable potential to exceed instream standards. Lead data from 2006 and 2008 (2
datapoints) both were nondetectable. RPA showed no reasonable potential to exceed
standard.
• Add quarterly monitoring requirements for total zinc at Rocky River discharge location
(Outfall 002) and Long Creek discharge location due to reasonable potential to exceed
instream action level standards. Zinc data from 2006 and 2008 (2 datapoints) both were
detectable. RPA showed reasonable potential to exceed the standard.
• Minor language changes have been added in chronic toxicity testing requirements at
Rocky River and Long Creek outfalls.
• The plant description on the supplement to permit cover sheet has been modified based
on 2008 staff report and 2008 compliance inspection report submitted by Mooresville
Regional Office. Changes:
o Two influent pump stations have been removed.
o Added one secondary clarifier. Total of three secondary clarifiers
o Only one aerobic sludge digester
o Two aerated sludge holding basins
o Sludge drying beds not in use
o Added one standby electric generator. Total of two standby generators (dual)

NPDES Permit Fact Sheet — 10/20/09 Town of Oakboro WWTP
Page 2 NC0043532
2.0 Summary
The Town of Oakboro has requested renewal of the existing permit While the facility is
currently permitted for 0.9 MGD, past upgrades were completed which allow the facility to
accommodate a design flow of 1.2 MGD. Oakboro is now a regional facility, serving the Town of
Oakboro, Town of Stanfield and City of Locust. Oakboro's pretreatment program has been
inactive since 2001, and none of its tributary communities have pretreatment programs.
Upon recent completion of its expansion, the Oakboro WWTP now has two outfall. lines (001 and
002) deriving from the same treatment process. Line 001 to Long Creek is an emergency outfall
that would only be used if the pump station to Rocky River fails (outfall 002). The outfalls cannot
be used concurrently. The valve that controls outfall 001 is kept secured to avoid accidental
discharge to Long Creek.
Neither Long Creek nor the Rocky River are listed on the NC 2006 303 (d) list. However the
draft 2008 303(d) list has the Rocky River in subbasin 030714 impaired for turbidity. Potential
sources are land clearing and stormwater runoff. There are approximately 29 miles of impaired
stream.
From the 2004 factsheet: The Town of Oakboro is a member of the Yadkin Pee -Dee River Basin
Association and is therefore not required to perform instrearn monitoring. There are YPDRBA monitoring
stations both upstream and downstream of the Long Creek outfall and a DWQ ambient monitoring station
approximately 10 miles downstream of the Rocky River discharge. A 1994 WLA recommends downstream
monitoring approximately 1.7 miles downstream (at the end of SR 1659) for DO, fecal, temperature, and
conductivity, however this may not be necessanj due to the low IWC (4.6% on Rocky River)
Note: In 1993, a QUAL2E model was performed on Rocky River and Mallard Creek to assist with the
management of wastewater discharge issued in the upper watershed of the Rocky River. It was
recommended that no new or expanded discharges be permitted in the study area unless an evaluation of
engineering alternative shows that it is the environmentally sound alterative. If new or expanded
discharges are permitted, they will receive BAT technology limits in the watersheds above the confluence of
Mallard Creek and the Rocky River, due to severely limited assimilative capacity. Any new or expanding
discharge in the lower watersheds of the Rocky River should receive a total BODu(CBOD + NBOD) limit
of 32 mg/L or less, equivalent to 10 rng/L BOD5 and 4 nzg/L NH3 for typical domestic discharges. This
level of treatment will protect the DO standard as well as preventing any one discharge from exhausting
100% of the available assimilative capacity of the river.
3.0 Compliance Summary
WET Testing Results
Oakboro performs quarterly WET testing. Currently, tests are conducted at an effluent
concentration of 4.6% to represent the 0.9 MGD discharge to Rocky River. From January 2005 to
July 2009, the facility has passed all 18 toxicity tests. It is recommended that chronic toxicity
testing continue in the renewed permit. The permit also contains a chronic toxicity testing
requirement of 30% at the Long Creek outfall if discharge occurs from outfall. This condition
will also remain in the permit.
Correspondence File Review
There were no recurrent problems or deficiencies noted in the correspondence files. From the
period of January 2004 to August 2009, there were some permit limit violations. In 2007 and
2009, there were NOVs for BOD, with civil penalties paid. There were also NOVs for ammonia
nitrogen issued in 2006. Overall, the Oakboro WWTP has been well operated, however because

NPDES Permit Fact Sheet — 10/20/09 Town of Oakboro WWTP
Page 3 NC0043532
inadequate plant description and some equipment not being operational, the past two
compliance evaluation reports have rated the plant as "not compliant".
Reasonable Potential Analysis
A RPA were performed primarily for copper using DMR data from January 2006 through August
2009. Although data was minimum (2 datapoints), RPA was also done for lead, zinc, cadmium,
chromium, nickel and mercury. There was data reported for magnesium, however due to lack of
NC state standard or federal criteria, there was no RPA done on this data.
Analyses were completed for both Rocky River and Long Creek. Since both outfalls receive
effluent from the same waste -stream, the same DMR data was used for analyses at both locations.
Results of the RPAs are as follows:
• Monitoring data showed reasonable potential for the discharge to exceed the copper
water quality standard. Since copper is an action level parameter the permittee will not
receive a limit unless it fails WET tests and copper is identified as the cause. The twice -
monthly monitoring requirement will remain in the permit for both the Long Creek and
Rocky River outfalls..
• Monitoring data showed no reasonable potential for the discharge to exceed the lead,
cadmium, chromium, nickel and mercury water quality standards in either Rocky River
or Long Creek. Although data was minimal (two datapoints for each parameter), will
recommend no monitoring for any of the above parameters. Based on the RPA results
will recommend removal of lead limit at the Long Creek outfall 001.
• The monitoring data did show reasonable potential for the discharge to exceed the zinc
action level standard on Rocky River and Long Creek. Because there was minimal data
used in the RPA will recommend quarterly monitoring for zinc be added to the permit to
gather enough data for RPA at next permit renewal.
4.0 Proposed Schedule for Permit Issuance
Draft Permit to Public Notice: 10/21/2009
Permit Scheduled to Issue: February 1, 2010 (tentative)
5.0 State Contact Information
If you have any questions on any of the above information or on the attached permit, please
contact Jackie Nowell at 919-807-6386.
Copies of the following are attached to provide further information on the permit development
• Draft permit
Fact Sheet
Reasonable Potential Analysis
•
•
•
NPDES Re mmendation by:
Date l4�Zv/ Z/o cl

NPDES Permit Fact Sheet — 10/ 20/ 09 Town of Oakboro WWTP
Page 4
Regional Office Comments:
NC0043532
Regional Recommendation by:
Signature
Date
Reviewed and accepted by:
Regional Supervisor:
Signature
Date
NPDES Unit Supervisor:
Signature
Date

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1
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1
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1 0.00
1 0.04
1 0.08
1 0.12
1 0.16
1 0.20
1 0.24
1 0.28
1 0.32
1 0.36
1 0.40
1 0.44
1 0.48
1 0.52
1 0.56
1 0.60
1 0.64
1 0.68
1 0.72
1 0.76
1 0.80
1 0.84
2 0.84
2 0.93
2 1.02
2 •1.11
2 1.20
2 1.29
2 1.38
2 1.47
2 1.56
2 1.65
2 1.74
Reach # I Seg Mi
D.O.
7.53
7.84
8.05
8.20
8.29
8.36
8.40
8.43
8.45
8.47
8.48
8.48
8.49
8.49
8.50
8.50
8.50
8.50
8.50
8.50
8.50
8.50
8.25
8.41
8.47
8.50
8.51
8.52
8.52
8.52
8.52
8.52
8.52
D.O.
SUMMER
EXPANSION TO 0.020 MGD
CBOD I NBOD
3.08 3.24
3.06 3.21
3.04 3.18
3.02 3.15
3.00 3.13
2.97 3.10
2.95 3.07
2.93 3.05
2.91 3.02
2.89 2.99
2.87 2.97
2.85 2.94
2.83 2.92
2.82 2.89
2.80 2.87
2.78 2.84
2.76 2.82
2.74 2.80
2.72 2.77
2.71 2.75
2.69 2.73
2.67 2.71
2.45 2.15
2.42 2.10
2.39 2.06
2.36 2.02
2.33 1.98
2.30 1.94
2.28 1.91
2.25 1.87
2.23 1.84
2.20 1.81
2.18 1.77
CBOD I NBOD
Flow
1.23
1.24
1.25
1.25
1.26
1.27
1.28
1.29
1.29
1.30
1.31
1.32
1.33
1.33
1.34
1.35
1.36
1.37
1.38
1.38
1.39
1.40
2.08
2.12
2.16
2.20
2.24
2.29
2.33
2.37
2.41
2.45
2.49
Flow

Benthic Macroinvertebrate Sample
Waterbody
Location
Date
Bioclassification
LONG CR
SR 1917
08/23/06
Good
County
Subbasin
8 digit HUC
Index Number
Latitude
Longitude
STANLY
13
03040105
13-17-31
351326
801533
Level IV Ecoregion
Stream Classification
Drainage Area (mi2
Stream Width (m
Stream Deoth (m
Carolina Slate Belt
C
196
10
0.4
Visible Landuse (%)
Forested/Wetland
Urban
Agriculture
Other (describe)
100
0
0
0
Upstream NPDES Dischargers (>1MGD or <1MGD and within 1 mile)
NPDES Number
Volume (MGD
Oakboro WWTP
NC0043532
0.9 MGD
Long Creek WWTP
NC0024244
16.0 MGD
Water Quality Parameters
Temperature (°C)
Dissolved Oxygen (mg/L)
Specific Conductance (pS/cm)
pH (s.u.)
Water Clarity
28.2
8.6
270
0
colored (from dyes)
Habitat Assessment Scores (max)
Channel Modification (5)
Instream Habitat (20)
Bottom Substrate (15)
Pool Variety (10)
Riffle Habitat (16)
Left Bank Stability (7)
Right Bank Stability (7)
Light Penetration (10)
Left Riparian Score (5)
Right Riparian Score (5)
Total Habitat Score (100)
Sample Date
5
16
12
6
7
6
6
7
5
5
75
Sample ID
Substrate
ST
Site Photograph
Good mix of boulder, cobble, gravel and sand
EPT
BI
EPT BI
Bioclassification
08/23/06
10065
72
22
5.8
5.1
Good
08/23/01
8606
71
20
5.8
4.9
Good -Fair
08/22/96
7177
64
14
5.7
5.3
Good -Fair
07/12/89
4976
76
22
6.1
5.2
Good -Fair
07/24/86
3859
88
12
6.8
5.6
Fair
09/02/83
3068
59
15
6.6
4.9
Fair
Taxonomic Analysis
Several EPT taxa were (first collected at this site in 2006; Heterocloeon curiosum, Stenonema lenati, Stenacron interpunctatum , Acroneuria arenosa ,
Ceraclea ancylus , Lepidostoma , Neophylax oligius , and Oecetis persimilis . Common and abundant indicator taxa such as Caenis , Argia , Helisoma ,
Physella and two species of leeches suggest that low DO may be a stressor in this reach. Intolerant taxa found in 2006 include Psephenus herricki
(TV=2.4), Leucrocuta (TV=2.4), Stenonema lenati (TV= 2.3) and Pyralidae (TV=2). Thousands of the snail, Amnicola, covered the rocks.
Data Analysis
Albemarle's WWTP is located above this site and its discharge makes up much of the flow. The water had a red tinge in 2006 as has been noted in
prior sampling. The rating at this location has increased from Fair in 1983 to Good in 2006. However, over the past 10 years, the biotic Index has
remained fairly stable, with changes in the number of EPT taxa making the slight increase in bioclassification from Good -Fair to Good.

SOC PRIORITY PROJECT: No
To: Western NPDES Unit
Surface Water Protection Section
Attention: Jackie Nowell
Date: September 2, 2008
NPDES STAFF REPORT AND RECOMMENDATION
County: Stanly
Permit No. NC0043532
PART I - GENERAL INFORMATION
SEP
Physical Location
1. Facility and address: Town of Oakboro 24939-B Barbee's Grove Road
Post Office Box 610 Oakboro, NC 28129
Oakboro, North Carolina 28129
2. Date of investigation: January 22, 2004
3. Report prepared by: Michael L. Parker, Environmental Engineer II
4. Persons contacted and telephone number: Mr. Troy Branch, ORC, 704/485-4613
5. Directions to site: From the intersection of NC Highway 138 and SR 1953 east of the Town
of Oakboro, travel northeast on SR 1953 (Barbees Grove Road) approximately 2.20 miles to
the junction with a paved access road (no road name or number). The WWTP is located
approximately 0.3 mile north of the junction, at the end of the paved road.
6. Discharge point(s). List for all discharge points:
Latitude: 35° 14' 02" Longitude: 80° 16' 02"
Attach a U.S.G.S. map extract and indicate treatment facility site and discharge point on
map.
U.S.G.S. Quad No.: G 17 NE U.S.G.S. Name: Oakboro, N.C.
7. Site size and expansion are consistent with application? Yes. There is ample room for
expansion, if necessary.
8. Topography (relationship to flood plain included): Sloping east towards receiving stream at
the rate of 5 to 10%; the WWTP is not in a flood plain.

Page Two
9. Location of nearest dwelling: One dwelling is located about 1,000 feet from the WWTP.
10. Receiving stream or affected surface waters: Long Creek (outfall 001) and Rocky River
(outfall 002)
a. Classification: C (both locations)
b. River basin and subbasin no.: Yadkin; 03-07-13
c. Describe receiving stream features and pertinent downstream uses: Long Creek is
a moderate size creek with a rocky bottom (12 - 15 feet wide with depths ranging
from 6 inches to 2 feet). The Rocky River is a very large receiving stream (50 -
60 feet wide with depths ranging from 3 - 8 feet). Downstream users are
unknown.
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. a. Volume of wastewater to be permitted: 0.9 MGD
b. What is the current permitted capacity of the wastewater treatment facility? 0.900
MGD.
c. Actual treatment capacity of the current facility (current design capacity)? 1.2
MGD
d. Date(s) and construction activities allowed by previous Authorizations to
Construct issued in the previous two years: There have been no ATCs issued to
this facility in the past two years.
e. Please provide a description of existing or substantially constructed wastewater
treatment facilities: The existing treatment facilities consist of a step screen
system, a manual bar screen (for back-up), an aerated grit removal system,
instrumented flow measurement, dual aeration basins with mechanical aerators,
three secondary clarifiers, an aerated sludge digester, an aerated sludge storage
tank, chlorine gas disinfection, SO2 dechlorination, dual sludge drying beds
(currently not in use), and dual emergency power generators.
f. Please provide a description of proposed wastewater treatment facilities: There are
no proposed WWT facilities planned at this time.
g.
Possible toxic impacts to surface waters: Chlorine is used for disinfection,
however, dechlorination is provided. With the exception of a couple of
excursions, this facility has a generally good compliance history with regards to
toxicity.

Page Three
h. Pretreatment Program (POTWs only): The Town of Oakboro receives no
industrial wastewater; therefore, the Town does not participate in the Division's
pretreatment program.
2. Residuals handling and utilization/disposal scheme: The Town is authorized by DWQ
permit no. WQ0005387 to land apply all residuals generated in the WWT process.
3. Treatment plant classification: Class III
4. SIC code(s): 4952 Wastewater code(s): 01, 55 Main treatment unit code: 02003
PART III - OTHER PERTINENT INFORMATION
1. Is this facility being constructed with Construction Grant Funds or are any public monies
involved (municipals only)? Public monies were used in the construction of the existing
WWT facilities.
2. Special monitoring or limitations (including toxicity) requests: None at this time.
3. Important SOC, JOC or Compliance Schedule dates: This facility is neither under an SOC
nor is one being considered at this time.
4. Alternative Analysis Evaluation: There is no known alternative other than a discharge at
this time.
PART IV - EVALUATION AND RECOMMENDATIONS
The Town of Oakboro is requesting the renewal of the subject NPDES permit. There
have been no changes to the existing WWT facility or the permit since the permit was last
renewed. The Town continues to use the outfall to the Rocky River (outfall 002) as its primary
discharge point and outfall 001 (Long Creek) will be retained as a back up. The Town continues
to receive municipal wastewater from the Towns of Stanfield and Locust.
Excessive I/I flow from a main segment of the Town's sewer collection system has
resulted in numerous SSOs in recent months. The Town is attempting to alleviate future SSOs
by installing a parallel line that will enable the Town to receive the additional flow, however,
changes may be necessary at the WWTP that will allow the plant to process the additional
wastewater without compromising treatment efficiency and effluent compliance. The conversion
of an existing (but currently unused) aeration basin into an EQ basin is one option that the Town
may choose to explore.

Page Four
Pending a review and approval of the draft permit, it is recommended that the NPDES
permit for this facility be renewed as requested.
Signature of eport Preparer Date
Water Quality Regional Supervisor Date
H:\dsr\dsr08\oakboro.doc

e_70;1;1?/ 0
Oa/do4€6
109 A N. Main Street
P.O. Box 610
Oakbom, NC 28129
704-485-3351 (phone)
704-485-2439 (fad)
July 14, 2008
Mrs. Dina Sprinkle
NC DENR/DWQ/Point Source Branch
1617 Mail Service Center
Raleigh, NC 27699-1617
RE: Request for NPDES Permit Renewal
NPDES Permit No. NC0043532
Oakboro WWTP
Stanly County
Dear Mrs. Sprinkle,
RECEIVED
JUL 2 9 2003
DENR - WATER QUALITY
POINT SOURCE BRANCH
The Town of Oakboro respectfully requests renewal of the Oakboro WWTP NPDES
Permit.
The following is an update since the last permit renewal and/or comments:
1) The Town has had no industrial flow in the last five (5) years and no longer
participates in the NC Pretreatment Program and we are presently permitted at 0.9
MGD discharge.
2) We continue to be active members in the YPDRBA in which they continue to
monitor receiving streams (Long Creek and Rocky River)
3) An additional Chronic Toxicity WET test for July 2008 has been conducted;
however at the time of this request, the results had not been received. We will
forward these results to your office at a later date for your review.
4) In our phone conversation to Mr. Charles Weaver of 2-27-08, he authorized us to
do only one (1) PPA in lieu of three (3) due to the fact our permitted flow is <1.0
MGD and we do not have a pretreatment program.
5) Our present Mayor is Mrs. Joyce H. Little in lieu of Mr. Joe Lowder and request
all future correspondence to be addressed to Mayor Little.
Sincerely,
Larry Branch
Town Administrator
Town of Oakboro
Phone: [phone]
Cell: 704-322-8666
Email: [e-mail]

Scale: 1a = 2000'
DRAWN BY: AGD
DATE: 7/08
DWG. NO.:
Farr. mown
Oakboro .„
•P:adEilArd 1915
APPROVED BY:
Oakboro Waste Water Treatment Plant
Vidnity Map
1 of 1

24
Red
Cross
TREE RO
QIQ 4;
VOCINI T Y AilAr)
'po
ky River
Springs r
ti _

go7ww, j Oaao4eo-
109-A N. Wain Street
B.O. Boo 610
Oakboro, NC 28129
704-485-3351 (phone)
704-485-2439 (fax)
Sludge Management
The Town of Oakboro WWTP utilizes a 400,000 gallon aerobic digester
with two (2) floating aerators and one (1) mixer with floating weir for
dewatering.
Synagro Inc. is the Town's contractor operator, which handles permitting,
reporting and land application. At present we have approximately 143.8
acres of permitted land.
If further information is required see Permit WQ0005387 or contact this
office.
r�
rry Branch, Town Administrator
Ge
Phone: [phone]
Cell: 704-322-8666
Email: [e-mail]

FACT SHEET FOR EXPEDITED PERMIT RENEWALS
Basic Information to determine potential for expedited permit renewal
Reviewer/Date
R.�,,,, 'k f -__ 5 — o ZS
Permit Number
O 3 532
Facility Name
"- , w,,.g, (),- 044e.f5 Op.„, l,.l,v'rP
Basin Name/Sub-basin number
`-ATnc.► 1.4 © 3 -oq--1-t 03 -- o' —
Receiving Stream
R, o ,-1 k i v / L,t, � G (` .,rkc,
Stream Classification in Permit
Does permit need NH3 limits?
'4
Does permit need TRC limits?
'-1 , s—
Does permit have toxicity testing?
`i-Xze
Does permit have Special Conditions?
r� �f,&--1,,,,
Does permit have instream monitoring?
y ;r.'
Is the stream impaired (on 303(d) list)?
'16-r
Any obvious compliance concerns?
G lfw—
Any permit mods since last permit?
cf..c-ls
Existing expiration date
J A.,t4 31, 2,00c1
,
New expiration date
J Or,.4 '31 2 , ci'4'
New permit effective date
- f -itt
Miscellaneous Comments
C hs-c - fi'p A,,. > .'7/1"
YES
This is a SIMPLE EXPEDITED permit renewal (administrative
renewal with no changes, or only minor changes such as TRC, NH3,
name/ownership changes). Include conventional WTPs in this group.
YES_ This is a MORE COMPLEX EXPEDITED permit renewal (includes
Special Conditions (such as EAA, Wastewater Management Plan), 303(d)
listed, toxicity testing, instream monitoring, compliance concerns, phased
/ limits). Basin Coordinator to make case -by -case decision.
YES✓ This permit CANNOT BE EXPEDITED for one of the following reasons:
• Major Facility (municipal/industrial)
• Minor Municipals with pretreatment program
• Minor Industrials subject to Fed Effluent Guidelines (lb/day limits for BOD, TSS,
etc)
• Limits based on reasonable potential analysis (metals, GW remediation organics)
• Permitted flow > 0.5 MGD (requires full Fact Sheet)
• Permits determined by Basin Coordinator to be outside expedited process
TB Version 8/18/2006 (NPDES Server/Current Versions/Expedited Fact Sheet)