NC0024571_Permit (Modification)_20130510

NPDES DOCYNENT :SCANNING: COVER SHEET
NC0024571
Lumberton WWTP
NPDES Permit:
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
'Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Correspondence
Owner Name Change
Complaint Investigation
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
May 10, 2013
This docuui.ent is printed on reuse paper -ignore arty
content on the reirerse side

ern
MENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Pat McCrory Charles Wakild, P. E. John E. Skvarla, III
Govemor Director Secretary
May 10, 2013
Mr. Jim Walters
Deputy Director - Public Works
City of Lumberton
P.O. Box 1388
Lumberton, North Carolina 28359
Subject: Minor Modification
NPDES Permit NC0024571
Lumberton WWTP
Robeson County
Dear Mr. Walters:
Division personnel have reviewed and approved your application for modification of the
subject permit in order to reduce monitoring frequency for mercury to Quarterly from Monthly.
Language in the body of the permit allows this after 12 consecutive months of mercury data
below 12 ng/ L, which has been documented by way of laboratory reports. Accordingly, we
have modified the page A.(1.) EFFLUENT LIMITATIONS AND MONITORING
REQUIREMENTS to reflect quarterly monitoring for mercury, and have revised footnote 7
regarding mercury monitoring. Attached are the revised pages; please remove and replace these
pages in your permit. You must continue to use EPA Method 1631E with clean sampling
techniques for mercury monitoring. The existing mercury limits will remain as they are, but will
be reevaluated according to the Statewide Mercury TMDL at the next renewal in 2014.
This permit modification 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). Since
the change is made in accordance with language contained in the permit body, it is considered a
minor modification, not requiring a fee or public notice.
This permit modification shall be effective starting on June 1, 2013.
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
Location: 512 N. Salisbury St. Raleigh, North Carolina 27604
Phone: [phone] FAX: [phone]
Internet www.ncwaterquality.orq
NonrthCarolina
X'atura/Il,/
An Equal Opportunity l Affirmative Action Employer

If you have any questions concerning this permit, please contact Jim McKay at telephone
number [phone].
Sincerely,
dovi
ediacharles Wakild, P.E., Director
Division of Water Quality
cc: Central Files
Fayetteville Regional Office/Surface Water Protection - via email
NPDES Unit
EPA Region IV, Atlanta with fact sheet and Mercury Data - via email
Monti Hassan PERCS - via email

Permit NC0024571
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City of Lumberton
NC0024571
Lumber River
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Latitude: 34°3610" Sub -Basin: 03-07-51
Longitude: 78°59'37"
Facility
Location
Ouad Pt 123SW. SE Ltunberton
Stream Class: CSv•
Receiving Stream: Lumber River. Lumber River Basin
City of Lumberton
Pe2anitted Flom 20 MGD
fah
N00024572

Permit NC0024571
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
During the period beginning on the effective date of the 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
'
; . " L` IMITS s f
_
M' 11TO
INCH R O EN.TS°
:Monthly
Average
Wee ly:
C
• Pi-
Maximum
.-vim.,,..
Measurement
Frequent °'
y: it S 'iy�..5
-.S mpleType
' Y
Sample
s ;-•- yr 1
I` . r
Average
Flow
20 MGD
Continuous
Recording
Influent or
Effluent
BOD, 5 day (20°C) 2
[April 1- October 31]
11.0 mg/1
16.5 mg/1
Daily
Composite
Influent &
Effluent
BOD, 5 day (20°C) 2
[November 1- March 31]
18.0 mg/l
27.0 mg/1
_
Daily
Composite
Influent &
Effluent
Total Suspended Solids2
30.0 mg11
45.0 mg/1
Daily
Composite
Influent &
Effluent
NH3 as N [April 1 -October 31]
4.0 mg/I
12.0 mg/I
Daily
Composite
Effluent
NH3 as N [November 1- March 31]
8.0 mg/l
24.0 mg/1
Daily
Composite
Effluent
pH
6.0 - 9.0
Daily
Grab
Effluent
Dissolved Oxygen 3
Daily
Grab
Effluent
Dissolved Oxygen
Variable 1
Grab
Upstream &
Downstream
Fecal Coliform (geometric mean)
200/100 ml
400/100 ml
• Daily
Grab
Effluent
Total Residual Chlorine 4
28 µgll
Daily
Grab
Effluent
Total Nitrogen (NO2+NO3+TKN)
Monthly
Composite
Effluent
Total Phosphorus
Monthly
Composite
Effluent
Temperature (°C)
Daily
Grab
Effluent
Temperature (°C)
Variable 1
Grab
Upstream &
Downstream
Chronic Toxicity 5
Quarterly
Composite
Effluent
Pollutant Analysis 6
Annually
Composite
Effluent
Total Mercury 7
12.0 ng/ L
36.0 ng/ L
Quarterly
Grab
Effluent
Total Copper
Monthly
Composite
Effluent
Total Silver
Monthly
Composite
Effluent
Total Zinc
Monthly
Composite
Effluent
(Footnotes on next page)

Permit NC0024571
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
(Continued)
Footnotes:
1. Sample locations: E — Effluent, I — Influent, U — Upstream at Chippewa Street Bridge, D — Downstream at Highway 72.
Stream samples shall be grab samples and shall be collected 3/Week during June — September and 1/Week during the
remaining months of the year.
2. The monthly average effluent BOD5 and Total Suspended Solids 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. Limit/ Monitoring requirements apply only if chlorine or chlorine derivative is used for disinfection. The Division shall
consider all effluent TRC values reported below 50 ug/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 ug/1.
5. Chronic Toxicity (Ceriodaphnia dubia) P/F at 21%: February, May, August, and November see Supplement to Effluent
Limitations and Monitoring Requirements, Special Condition A(2.). TOXICITY MONITORING SHALL COINCIDE
WITH METALS MONITORING.
6. See Effluent Pollutant Scan, Special Condition A. (3).
7. Low level mercury analysis using EPA Method 1631E for all effluent mercury sampling is required. This limit will
become effective on the permit effective date.
There shall be no discharge of floating solids or visible foam in other than trace amounts.

Permit NC0024571
A (2). CHRONIC TOXICITY PERMIT LIMIT (QUARTERLY)
The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality to Ceriodaphnia
dubia at an effluent concentration of 21 %.
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" or subsequent versions. The tests will be performed during the
months of February, May, August and November. 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: NC DENR / DWQ / 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 wi11 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.

DENR/DWQ
FACT SHEET FOR NPDES PERMIT DEVELOPMENT AMMENDED 4/25/2013
NPDES No. NC0024571
Facility Information
Applicant/Facility Name:
Lumberton WWTP
Applicant Address:
P.O. Box 1388, Lumberton, NC 28359
Facility Address:
700 Lafayette Street, Lumberton, NC 28359
Permitted Flow
20.0 MGD
Type of Waste:
Domestic and industrial with pretreatment program
Facility/Permit Status:
Class IV /Active; Renewal
County:
Robeson County
Miscellaneous
Receiving Stream:
Lumber River
Regional Office:
Fayetteville (FRO)
Stream Classification:
C-Sw
State Grid / USGS Quad:
I23SW/SE Lumberton
303(d) Listed?
Yes; Hg advisory
Permit Writer:
Jim McKay
Subbasin:
03-07-51
Date:
April 26, 2013
Drainage Area (mi2):
713
Lat. 34° 36' 15" N Long. 78° 59' 45" W
s7Q10 (cfs)
120
w7Q10 (cfs)
191
Average Flow (cfs):
853
IWC (%):
21
SUMMARY
The City of Lumberton WWTP is currently permitted for 20.0 MGD flow of domestic and
industrial waste. The facility discharges to subbasin 030751, HUC 0304020310 in the Lumber
River, classified C Sw waters. The receiving stream is listed on the 2010 303(d) list as impaired
for mercury based on fish consumption.
DMR Data (2008-2010)
DMR data from January 2008 through July 2010 were reviewed. Data for conventional
. arameters are summarized in Table 1
Flow Temperature
(MGD) ("C)
Maximum
Minimum
6.48
16.82
3.23
19.99
28.8
10.0
Dissolved BOD TSS (mg/L) Fecal
Oxygen (mg/L) (#/100 mL)
(mg/L)
8.39
11.75
5.1
2.79
8.90
2.00
9.1
49.8
1.5
17.3
440.0
1.0
Table 1, NC0024571 Conventional Data (January 2008-July 2010)
This facility also collects data for total nitrogen, total phosphorus, and ammonia nitrogen (NH3-
N). It consistently meets its ammonia limits of 4.0 mg/L (summer) and 8.0 mg/L (winter). Total
Nitrogen levels average 10.0 mg/L and Total Phosphorous averages 0.89 mg/L.
A review of the metals (from both the DMRs and Pretreatment data) and toxicants was also
performed. With the exception of total residual chlorine (TRC), these are discussed in the
Reasonable Potential Analysis section. TRC levels from January 2008-July 2010 averaged 1.5
µme•
Fact Sheet
NPDES NC0024571 Renewal
Page 1

Correspondence Files/Compliance (2008-2010)
The Fayetteville Regional Office (FRO) conducted several site visits during this permit term to
evaluate compliance. The facility has demonstrated consistent compliance in meeting its permit
limits and has received no NOD's/NOV's in the past two years.
Instream Monitoring
The facility does instream monitoring for temperature and dissolved oxygen. As the receiving
waters are classified C Sw, the natural conditions sometimes include low DO. The upstream DO
was higher than the downstream DO 66% of the time, and lower 34% of the samples. Only one
data point showed more than 10% difference between up and downstream (11 % difference).
Toxicity Testing
Current requirement: Chronic P/F @ 21%. No changes recommended. The facility has been in
compliance with its toxicity limit.
PERMITTING STRATEGY
Waste Load Allocation (WLA)
The Division prepared the last WLA in 1993. The previous and current effluent limits were based
on guidelines and water quality standards. The Division has judged previous parameters and
limits to be appropriate for renewal with some exceptions. Changes to toxicant monitoring are
discussed in the Reasonable Potential Analysis section.
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 and pretreatment data from January
2008-July 2010. Calculations included parameters listed in the previous permit and pre-treatment
documents to include: arsenic, cadmium, copper, cyanide, chromium, lead, mercury, nickel,
selenium, silver, and zinc. Cadmium, arsenic, lead, chromium, nickel, and selenium; currently
monitored through the Pretreatment Long Term Management Plan (LTMP), showed no
reasonable potential to exceed water quality standards. These will continue to be monitored
through the LTMP. Copper, silver, and zinc were predicted at concentrations higher than the
allowable; however these three are action level parameters and limits are not commonly given
unless they are triggered under the Action Level Policy. These will remain in the permit as
monitored (but not limited) parameters. Cyanide does not show reasonable potential based upon
DMR data. Therefore, limits/monitoring for cyanide will be removed from the permit based on
our new permitting strategy. Mercury does have reasonable potential based upon DMR data. In
keeping with EPA guidance, the receiving water is assumed to have no assimilative capacity
since it is impaired for mercury through fish consumption advisories. An end of pipe limit of
12.0 ng/ L will be added to the permit without any dilution as a monthly average. A daily
maximum limit of 36 ng/ L will be added. If the facility produces 12 consecutive monthly
mercury tests below 12 ng/ L, they can petition the Division to reduce mercury monitoring to
quarterly from monthly. This will be considered to be a Minor Modification, not requiring public
notice.
Fact Sheet
NPDES NC0024571 Renewal
Page 2

In accordance with permit requirements contained in the footnotes on page A.(1) of the
permit, the permittee submitted copies of laboratory reports for mercury for the months of
April 2012 to March 2013. No values exceed 3.9 ng/ L; the average is 1.8 ng/ L with three
non -detects. As a result of this data review, mercury monitoring was changed to Quarterly
from Monthly. The limits of 12 ng/ L Monthly Average and 36 ng/ L daily Maximum were
retained, as was the requirement to continue to use EPA Method 1631E for all mercury
testing. On renewal, the permit writer should evaluate mercury monitoring and limits per
the Statewide Mercury TMDL procedures.
PROPOSED SCHEDULE FOR PERMIT ISSUANCE
Draft Permit to Public Notice:
Permit Scheduled to Issue:
Revised Permit Issue:
Revised Permit Effective Date:
October 5, 2010
March 8, 2011
May 3, 2013
June 1, 2013
NPDES DIVISION CONTACT
If you have questions regarding any of the above information or on the attached permit, please
contact Jim McKay at [phone].
NAME:-")^ A
REGIONAL OFFICE COMMENTS
DATE: '/ - 2 - la/
NAME: DATE:
SUPERVISOR: DATE:
Fact Sheet
NPDES NC0024571 Renewal
Page 3

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3/28/13 WQS = 12 ng/L MERCURY WQBEL/TBEL EVALUATION V:2012-4
Facility Name: Lumberton WWTP @ 20.0 MGD No Limit Required
Total Mercury 1631E PQL = 0.5 ng/L 7010s = 120.000 cfs WQBEL = 58.45 ng/L
Date Modifier Data Entry Value Permitted Flow = 20.000 MGD TBEL = 47 ng/L
Feb-08
May-08
Aug-08
Nov-08
Feb-09
May-09
Aug-09
Nov-09
Feb-10
May-10
Aug-10
Nov-10
Feb-11
May-11
Aug-11
Nov-11
4/4/2012
5/8/2012
6/5/2012
7/5/2012
8/7/2012
9/6/2012
10/2/2012
11/6/2012
12/4/2012
1/9/2013
2/12/2013
3/4/2013
<
<
4.3
1
1.00
1.00
1.20
1.00
1.20
1.00
3.60
1.00
1.00
3.10
1.40
2.50
2.00
1.20
2.6
1
1.00
1.00
1.00
1.30
3,90
1.70
2.40
2.30
1.00
3.90
4.3
0.5
0.5
0.5
1.2
0.5
1.2
0.5
3.6
0.5
0.5
3.1
1.4
2.5
2
1.2
2.6
1
0.5
0.5
1
1.3
3.9
1.7
2.4
2.3
0.5
3.9
1.5 ng/L - Annual Average for 2008
0.9 ng/L - Annual Average for 2009
1.9 ng/L - Annual Average for 2010
1.8 ng/L - Annual Average for 2011
1.7 ng/L - Annual Average for 2012
2.2 ng/L - Annual Average for 2013

NPDES Permitting for Mercury
Implementation of 2012 Statewide Mercury TMDL
Facility Type
Annual Average
Limit Required (see A)
Monitoring Frequency
(with 1631E analysis)
MMP Required (see B)
Major Muni (>1 MGD)
/V e a D 2 f5 3 t
@, f�. ,, f L „r, $c�.L„
Ail" 4 0
Yes
Quarterly
Yes (if> 2 MGD)
No
3 PPA only
Yes- if multiple detects
above 1 ng/I. and > 2
MGD
Minor Muni (<1 MGD)
Yes
Quarterly
No
No
Once/5 years
No
Industrial
Yes
Quarterly
Yes
No
None in permit. Might be
required for EPA
application form.
No
A.Procedure to Determine if Annual Average Limit Required:
Step 1- WQBEL Evaluation
• Evaluate need for Water Quality Based Effluent Limit (WQBEL)
• Calculate Allowable mercury concentration using dilution (12 ng/1 x 7Q10 dilution factor)
• Compare Annual effluent concentrations to Allowable Conc. for each of last 5 years
• If any Annual Avg > Allowable Conc., then add Annual Avg WQBEL.
Step 2- TBEL Evaluation
• Evaluate need for Technology Based Effluent Limit (TBEL)
• Compare all individual values to TBEL of 47 ng/1
• If any single value > 47 ng/I, then add Annual Avg TBEL of 47 ng/I.
Step 3- Compare WQBEL to TBEL
• If data triggers need for WQBEL and TBEL, select most stringent of the two limits.
• The Annual Avg limit will be capped at 47 ng/1 based on TBEL.
Step 4- If NEW limit, delay effective date
• Addition of new limit will become effective in 5th year of permit, with mercury minimization plan
development/implementation required for first 4 years (see MMP below).
B. Mercury Minimization Plan (MMP). If an MMP is required > 2 MGD), add the following Special
Condition to the permit:
A(x). Mercury Minimization Plan (MMP). The permittee shall develop and implement a mercury
minimization plan during this permit term. The MMP shall be developed within 180 days of the NPDES
Permit Effective Date, and shall be available for inspection on -site. A sample MMP was developed
through a stakeholder review process and has been placed on the Division website for guidance
(http://portal.ncdenr.org/web/wq/swp/ps/npdes, under Model Mercury Minimization Plan). The MMP
should place emphasis on identification of mercury contributors and goals for reduction. Results shall be
summarized and submitted with the next permit renewal.
C. New/Expanding Dischargers- will be allowed as long as the overall aggregate point source load
allocation is not exceeded.
D. Special Situations- Additional site -specific information, such as fish tissue and water column data
when available, will be considered in assigning limits and MMP requirements. Also, limits > TBEL may
be considered on case -by -case basis due to extenuating circumstances.
Approved By: Jeff Poupart
Prepared By: Tom Belnick
Version 01/30/2013

&tg of Zumb£tton.
PUBLIC UTILITIES LABORATORY
POST OFFICE BOX 1388
_umiivcton, Alma. Catotina
28359-1388
March 21, 2013
Permit # NC0024571
NC DENR DWQ
Attention: Central Files
1617 Mail Service Center
Raleigh, NC 27699-1617
700 LAFAYETTE STREET
910-671-3858
1 4I
J'i , kit a J (v 1 J cAi) one
Si pr#' (elite),
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2i
This letter is to request that our Low Level Mercury sampling frequency be
reduced to quarterly. For the past 12 consecutive months our results have been
below 12 ng/L. I have enclosed copies of our results.
Thank You for your cooperation in this matter.
Should you have any questions please feel free to contact me at 910-671-3 85 8.
Sincerel
,44
Taifzmy Smit
Laboratory Supervisor E.U.S.D
City of Lumberton
H010/A6 3021t109 .l NIOci
undno
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