NC0027103_NPDES Draft Permit_20090701

NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins Dee Freeman
Governor Director Secretary
July 1, 2009
Mr. McDuffe Cummings
Manager
Town of Pembroke
P. O. Box 866
Pembroke, NC 28372
Subject: Draft of Renewal Permit
NPDES Permit NC0027103
Town of Pembroke WWTP
Robeson County
Dear Mr. Cunnings:
J
Enclosed with this letter is a copy of the renewal draft permit for your facility. Be aware there are
some changes from your existing permit. Please review the draft carefully to understand the conditions,
measurement units, and new requirements.
Your permit is among several in the Lumber River basin that are up for renewal. The changes made
in your renewal permit were done to meet North Carolina water ,quality standards (WQS) and to clarify the
narrative where needed:
Summary of Changes/Corrections/Additions
1) Mercury monitoring was removed (Mercury Reopener Specia/ Condition removed). Evaluation of
data indicated no potential to exceed WQS. Mercury analysis of the effluent will continue to be part
of the PPA.
2) Cadmium monitoring was added. Total Cadmium has a chronic WQS. The PPA data did not provide
sufficient accuracy to eliminate the potential to exceed WQS. The more accurate' data will be used
to evaluate future total cadmium impact to WQS.
3) The Special Condition A. (2.) narrative has been edited. Additional language was added to state all
collected analysis must be submitted to the Environmental Sciences Section.
4) A new TRC footnote rep/aced the existing footnote. The ability to accurately determine TRC values
has been recognized by the Division. The new footnote clarifies what is required.
For cadmium .the facility may petition the Division of Water Quality for re -valuation of the potential
impact to the Lumber River, and subsequent elimination of cadmium monitoring. This typically requires a
minimum of 12 consecutive measurements.
The permit draft will be sent to the EPA Region IV, Division of Environmental Health, and
Environmental Sciences Section for comment and approval.
Page 1 of 2
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: http: / / h2o.state.nc.us /
An Equal Opportunity \ Affirmative Action Employer
One
North.Carolina
VatualI

Concurrent with this notification the Division is publishing a notice in the newspaper having
circulation in the general Robeson County area, soliciting public comments on this permit draft. P/ease
provide any comments you may have regarding this draft to DENR — DWQ, NPDES Program no later than
30 days after receiving this draft permit._
Following the 30-day public comment period, the Division will review all pertinent comments and
take, appropriate action prior to issuing ,a final permit. If you have questions concerning the draft for your
facility, please call Ron Berry at [phone] or by emailat [e-mail].
If no adverse comments are received from the public or from you, this permit will likely be issued in
August 2009, with an effective date of September 1, 2009, expiring on July 31, 2014.
Sincerely,
Ron Berry
Eastern NPDES Program
Attachments
Cc: • Fayetteville. Regional Office/Surface Water Protection Section (with Fact Sheet/email copy)
EPA Region IV/Marshall Hyatt (with Fact Sheet and application form)
Environmental Sciences Section/AquaticToxicology Unit/Susan Meadows (email copy)
DEH/Fayetteville Regional Office/ Debra Benoy (with approval form/email copy)
NPDES Unit
Page 2 of 2

Permit NC0027103
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 provisions 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,
Town of Pembroke
is hereby authorized to discharge wastewater from a facility located at the
Pembroke Wastewater Treatment Plant
Off NCSR 1339
South of Pembroke
Robeson County
to receiving waters designated as the Lumber River in the Lumber 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 tbd.
This permit and authorization to discharge shall expire at midnight on July 31, 2014.
Signed this day tbd.
DRAFT
Coleen H. Sullins, Director
Division of Water Quality
By Authority of the Environmental Management Commission

Permit NC0027103
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.
Town of Pembroke
is hereby authorized to:
1. Continue to operate an existing 1.33 MGD wastewater treatment plant consisting of the
following:
p Influent collection sump
p Influent transfer pumps
p Mechanically cleaned bar screen
p Influent flow meter
p Influent composite sampler
0 Grit chamber
p Flow splitter box
p Two (2) oxidation ditches
0 Flow splitter box
0 Two (2) clarifiers
p Chlorine contact chamber
p . Chlorination
Dechlorination
Effluent flow meter
p Cascade post aeration
0 Effluent composite sampler
Gravity flow pipe to Lumber River
Aerobic sludge digester
p Sludge holding tank
0 Back up generator
Facility is located at the Pembroke Wastewater Treatment Plant off NCSR 1339, Pembroke,
Robeson County.
2. Discharge from said treatment works at the location specified on the attached map, into the
Lumber River, classified WS-IV B SW HQW waters in the Lumber River Basin.

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NC0027103
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USGS Quad: I22NW Pembroke, NC
Outfall Facility
Latitude: 34° 39' 56.1" N 34° 40' 4.85" N
Longitude: 79° 12' 12" W 79° 12' 7.29" W
Stream Class: WS IV, B, Sw, HQW
Subbasin: 03-07-51
Receiving Stream:. Lumber River
North
Town Of Pembroke WWTP NC0027103
Robeson County

Permit NC0027103
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS - DRAFT
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 ._ '
CHARACTERISTICS: -
LIMITS
MONITORING REQUIREMENTS
Monthly
Average °
Weekly ';;"
Average
Daily
Maximum
Measurement
'-Frequency
'. Sample- "
Type
Sample
- Location
Flow
1.33 MGD
Continuous
Recording
influent or
Effluent
Temperature, °C
Daily
Grab
Effluent
Temperature, -C
(June 1— September 30)
3/Week
Grab
Upstream &
Downstream 1
Temperature, °C
(October 1 — May 31)
Weekly
Grab
Upstream &
Downstream 1
BOD, 5-day, 20° C 2
18.0 mg/L
27.0 mg/L
3/Week
Composite
influent &
Effluent
Total Suspended Solids (TSS) 2
20.0 mg/L
30.0 mg/L
3/Week
Composite
Influent Effluent
Ammonia as Nitrogen (NH3-N)
12.0 mg/L
35.0 mg/L
3/Week
Composite
Effluent
Dissolved Oxygen (DO)
Not less than 5.0 mg/L daily
average
3/Week
Grab
Effluent
Dissolved Oxygen, mg/L (DO)
(June 1— September 30)
3/Week
Grab
Upstream &
Downstream 1
Dissolved Oxygen, mg/L (DO)
(October 1 — May 31)
Weekly
Grab
Upstream &
Downstream 1
Fecal Coliform
(Geometric mean)
200/100
ml
400/100
ml
3/Week
Grab
Effluent
pH
Not more than 9.0 s.u. nor less
than 6.0 s.u.
3/Week
` Grab
Effluent
Total Residual Chlorine 3
28 µg/L
3/Week
Grab
Effluent
Total Kjeldahl Nitrogen (TKN)
Monitor and Report, mg/L
Monthly
Composite
Effluent '
Nitrite/Nitrate Nitrogen
(NO2-N + NO3-N)
Monitor and Report, mg/L
Monthly
Composite
Effluent
Total Nitrogen (TN)
TN = (NO2-N + NO3-N) + TKN
Monitor and Report, mg/L
Monthly
Calculated
Effluent
Total Phosphorus (TP)
Monitor and Report, mg/L
Monthly
Composite
Effluent
Cadmium, µg/L 4
Monthly
Grab
Effluent
Chronic Toxicity 5
Quarterly
Composite
Effluent
Pollutant Analysis 6
Annually
Composite
Effluent
Footnotes:
1. Sample locations: Upstream = CSX R.R. Trestle (above plant), Downstream = at Bridge SR 1554.
2. The monthly average effluent BOD, and Total Suspended Solids concentrations shall not exceed 15
percent of the respective monthly average influent value (85% removal).
3. Total Residual Chlorine compliance is required for chlorine or chlorine derivative used for
disinfection. The Division shall consider all effluent TRC values reported below '50 ug/I 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 ug/I.
4. Cadmium measurement detection minimum of 1 µg/L.
5. Chronic Toxicity (Ceriodaphnia) P/F at 1.7%; January, April, July, and October. See Special Condition
A.(2.) of this permit. Quarterly sampling shall be conducted at the same time as metal and other
effluent parameters sampling is conducted.
6. See Condition A.(3.) of this permit.
There shall be no discharge of floating solids or visible foam in other than trace amounts.

Permit NC0027103
A. (2.) CHRONIC TOXICITY PERMIT LIMIT (QRTRLY)- DRAFT
The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality to
Ceriodaphnia dubia at an effluent concentration of 1!7 %.
The permit holder shall perform at a minimum, quarterly 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 // 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 -I (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: 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, 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.

Permit NC0027103
A. (5.) EFFLUENT POLLUNTANT SCAN - DRAFT
The permittee shall perform Effluent Pollutant Scans for all parameters listed in the attached table (in
accordance with 40 CFR .Part 136). Samples shall be collected in different calendar years, approximately
annually, except to provide seasonal variation. Unless otherwise indicated, metals shall be analyzed as "total
recoverable."
Ammonia (as N)
Trans-1,2-dichloroethylene
Bis (2-chloroethyl) ether
Chlorine, total residual (TRC)
1,1-dichloroethylene
Bis (2-chloroisopropyl) ether
Dissolved oxygen
1,2-dichloropropane
Bis (2-ethylhexyl) phthalate
Nitrate/Nitrite
1,3-dichloropropylene
4-bromophenyl phenyl ether
Kjeldahl nitrogen
Ethylbenzene
Butyl benzyl phthalate ,.
Oil and grease
Methyl bromide
2-chloronaphthalene
Phosphorus
Methyl chloride
4-chlorophenyl phenyl ether
Total dissolved solids
Methylene chloride
Chrysene
Hardness
1,1,2,2-tetrachloroethane
Di-n-butyl phthalate
Antimony
Tetrachloroethylene
Di-n-octyl phthalate
Arsenic
Toluene
Dibenzo(a,h)anthracene
Beryllium
1,1,1-trichloroethane
1,2-dichlorobenzene
Cadmium
1,1,2-trichloroethane
1,3-dichlorobenzene
Chromium
Trichloroethylene
1,4-dichlorobenzene
Copper -
Vinyl chloride
3,3-dichlorobenzidine
Lead
Acid -extractable Compounds
Diethyl phthalate
Mercury
P-chloro-m-creso
Dimethyl phthalate
Nickel
2-chlorophenol
2,4-dinitrotoluene
Selenium
2,4-dichlorophenol
2,6-dinitrotoluene
Silver
2,4-dimethylphenol
1,2-diphenylhydrazine
Thallium
4,6-dinitro-o-cresol
Fluoranthene
Zinc
2,4-dinitrophenol
Fluorene
Cyanide
2-nitrophenol
Hexachlorobenzene
Total phenolic compounds
4-nitrophenol
Hexachlorobutadiene
Volatile Organic Compounds
Pentachlorophenol
Hexachlorocyclo-pentadiene
Acrolein
Phenol
Hexachloroethane
Acrylonitrile
2,4,6-trichlorophenol
Indeno(1,2,3-cd)pyrene
Benzene
Base -neutral Compounds
lsophorone
Bromoform
Acenaphthene
Naphthalene
Carbon tetrachloride
Acenaphthylene
Nitrobenzene
Chlorobenzene
Anthracene
N-nitrosodi-n-propylamine
Chlorodibromomethane
Benzidine
N-nitrosodimethylamine
Chloroethane
Benzo(a)anthracene
N-nitrosodiphenylamine
2-chloroethylvinyl ether.
Benzo(a)pyrene
P' henanthrene
Chloroform
3,4 benzofluoranthene
Pyrene
Dichlorobromomethane
Benzo(ghpperylene
1,2,4-trichlorobenzene
1,1-dichloroethane
Benzo(k)fluoranthene
1,2-dichloroethane
Bis (2-chloroethoxy) methane
The Permittee shall report test results within 90 days of sample collection to the Division in DWQ Form- DMR-
PPA1 or other form approved by the Director (see NPDES Unit web site). The report shall be submitted to the
following address:
Division of Water Quality _
Water Quality Section / Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
Submittal of RPA results with NPDES renewal applications will be required.

DENR/DWQ
FACT SHEET FOR NPDES PERMIT DEVELOPMENT
NPDES No. NC0027103
Facility Information
Applicant/Facility Name:
Town of Pembroke WWTP
Applicant Address:
P.O. Box 866; Pembroke, NC 28372
Facility Address:
8257 Deep Branch Road, Pembroke, NC 28372
Permitted Flow
1.33 MGD
Type of Waste:
100% domestic
Facility/Permit Status:
Class III /Active; Renewal
County:'
Robeson County
Miscellaneous
Receiving Stream:
Lumber River
Stream Classification:
WS IV, B, Sw, HQW
Subbasin:
03-07-51
Index No.
14-(7)
Drainage Area (mi2):
427
303(d) Listed?
No
Summer 7Q10 (cfs)
120
Regional Office:
Fayetteville
I22NW
Winter 7Q.10 (cfs):
-
State Grid / USGS Quad:
30Q2 (cfs),
-
Permit Writer:
Ron Berry
Average Flow (cfs):
387.74 (est USGS)
Date:
6/18/09
IWC (%): `_
1.7
BACKGROUND
The Town of Pembroke operates a 1.33 MGD wastewater treatment facility that serves the
Pembroke community, estimated 4,200 population.. The Pembroke Plant discharges treated
100% domestic wastewater to Lumber River, a class WS IV, B, Sw, HQW water in the Lumber
River Basin
Untreated domestic waste is collected in the plant influent sump. The influent pump system
feeds the plant headworks. The untreated waste flow is screened through a mechanical bar
screen, passes through the influent meter, flows through a pre-aeration/grit removal system,
and flows into a flow splitter box. The influent composite sample is collected adjacent to the
influent meter.
From the splitter box 2 discrete flow rates are directed to 2 oxidation ditches. Each ditch is
rated for 0.66 MGD treatment capacity. The discharge flows from the ditches recombine and
is directed by a splitter box to 2 equal sized clarifiers. The clarifiers liquid discharges
combine and continue to the chlorine contact chamber where chlorination and
dechlorination treatment is performed.
As the treated waste exits the contact chamber it passes through the effluent flow meter,
post aeration cascade system, and into the pipe that discharges into the Lumber River. The
effluent composite sampler is located at the exit of the cascade system.
An aerobic sludge digestor collects wasted sludge and provides treatment before
transferring the treated sludge to a holding tank. The dewatered sludge is normally land
applied, or if need can be dispose of via a contract service. As required back up power is
available.
HISTORY
The facility has 4 compliance limits violations and 5 monitoring violations from September
2004 to December 2009. There have been no process changes during this permit cycle. In
the 2006 303(d) list this steam segment is no longer listed as impaired.
PERMITTING STRATEGY
Reasonable Potential Analysis (RPA)
The Division conducted EPA -recommended analyses to determine the reasonable potential
for toxicants to be discharged by this facility, based on DMR data from February 2007 to
January 2009 and from the 3 PPA submitted with the renewal application. Evaluations were
conducted for arsenic, beryllium, cadmium, chromium, copper, cyanide, hardness, lead,
•Fact Sheet
NPDES NC0027103
Page 1 of 3

mercury, nickel, nitrate nitrogen (use nitrite/nitrate data), chlorinated phenolic compounds
(use total phenolic data), selenium, silver, total dissolved solids, and zinc.
Results suggest reasonable .potential for the facility to discharge zinc in excess of water
quality standards. However, zinc is an action level parameter and the facility has
consistently passed its toxicity test and will not be added to the permit. THE PPA cadmium
,values were below the measurement method limit, < 50 µg/L. This resulted in the RPA
suggesting a reasonable potential for the effluent to exceed the water quality acute
standard. Cadmium monitoring will be added to the permit. All other evaluated compounds
were deemed not significant and do not require any additions to the permit, Mercury
monitoring will be removed from the permit but is still required in the PPA.
Data review
DMRs were reviewed for' the period of February 2007 to January 2009. DMR data is
summarized in Table I below:
Table I (monthly averages)
Flow
(MGD)
Dissolved
Oxygen
(mg/L)
BOD*
(mg/L)
TSS*
(mg/L)
y
NH3-N
(mg/I)
Fecal
Coliform
(#//100 ml)
Total
Residual
Chlorine
(µg/I)
Average
0.74
8.5
4.3
4.0
1.8
109.7
5
Maximum
1.24
11.6
12.0
9.6
10.1
754.3
19
Minimum
0.45
6.8
1.7
1.3
< 0.1
4.0
< 10
*Percent Removal: Based on BOD 91% -97%, Based on TSS 90% - 97%
Table II (month v averages
PH
(s.u.)
Total
Nitrogen
(mg/L)
Total
Phosphorus
(mg/L)
Average
6.9
5.2
1.6
Maximum
7.6
13.7
6.5
Minimum
6.1
1.2
> 0..1
Whole Effluent Toxicity
The permit requires quarterly chronic toxicity limit testing using ceriodaphnia dubia, at 1.7%
effluent concentration. The facility passed the 18 toxicity tests submitted since September
2004. An additional 4 second species toxicity tests were submitted with the renewal
application, all ChV values were > 6.8%, higher than the 1.7% effluent concentration. Will
continue the quarterly chronic toxicity limit testing as defined.
Priority Pollutant Analysis
The results of 3 PPA were submitted with the permit renewal application. See RPA Analysis
for results. Will continue to include the special condition for submittal of seasonal PPA
annually.
lnstream Data Impact
Temperature and dissolved oxygen are required monitoring parameters at designated points
upstream and downstream from the discharge into the Lumber River. lnstream Fecal
coliform monitoring was voluntary. One set of instream and effluent data for parameter in
each month from 2007 and 2008 data was reviewed to evaluate the impact of the effluent.
There was some limited correlation between the effluent and its impact to the receiving
stream. Will continue instream monitoring requirements as defined.
Effluent Limitations
The existing permit conventional effluent limits for BOD, TSS, 85% removal, pH will continue.
The permitted flow will remain unchanged.
Fact Sheet
NPDES NC0027103
Page 2 of 3

Water Quality Limitations
The existing permit water quality based limits for fecal coliform, dissolved oxygen, and total
residual chlorine will continue. A revised narrative defining measurement compliance for
total residual chlorine will be made. The existing permit chronic toxicity limit test will
continue. Based on the previous oxygen consumption calculation the existing permit
ammonia as nitrogen limits will continue.
Monitoring
The existing permit monitoring requirements for effluent total nitrogen, total phosphorus,
temperature, and instream parameters will continue. Narrative changes for the TN
components will be made. Cadmium will be added to collect data for future RPA evaluation.
Mercury will be removed.
SUMMARY OF PROPOSED CHANGES
In keeping with Division policies the following will be incorporated into the permit:
p Mercury monitoring was removed.
Cadmium monitoring was added.
p Revised narrative for total residual chlorine and total nitrogen
PROPOSED SCHEDULE FOR PERMIT ISSUANCE
Draft Permit to Public Notice: July 1, 2009
Permit Scheduled to Issue: October 1, 2009
NPDES DIVISION CONTACT
If you have questions regarding any of the above information or on the attached permit,
please contact Ron Berry at [phone] or email [e-mail].
NAME: RON BERRY DATE: 6/23/09 GaBO
REGIONAL OFFICE COMMENTS
NAME: DATE:
SUPERVISOR: DATE:
Fact Sheet
NPDES NC0027103
Page 3 of 3