NC0027103_Permit Renewal_20160627

AFFIDAVIT OF PUBLICATION
STATE OF NORTH CAROLINA
COUNTY OF ROBESON
Tammy Oxendine
Associate Editor, of THE ROBESONIAN, a newspaper
published in Robeson County, N.C. being duly
sworn, says that at the time the attached notice was
published in THE ROBESONIAN, said newspaper
met all of the requirements and qualifications
prescribed by North Carolina General Statute 1-597;
that said newspaper had a general circulation to actual
paid subscribers; and, was admitted to the United States
mail as second class matter in Robeson County, N.C.;
and further, that the attached notice was published in
THE ROBESONIAN on
S
Associate Editor
20 )I
Sworn to and subscribed before me
this the day of
NOTARY PUBLIC
My commission expires:
20 ) (v
Public Notice
North Carolina Environmental Man-
agement CommissionfNPDES Unit
1617 Mail Service Center
Raleigh. NC 27699-1617
Notice of Intent to issue a NPDES
Wastewater Permit
The North Carolina Environmental Man-
agement Commission proposes to issue
a NPDES wastewater discharge permit to
the person(s) listed below. Written com-
ments regarding the proposed permit will
be accepted until 30 days after the pub-
lish date of this notice. The Director of the
NC Division of Water Resources (DWR)
may hold a public hearing should there
be a significant degree of public interest.
Please mail comments andfor informa-
tion requests to DWR at the above ad-
dress. Interested persons may visit the
DWR at 512 N. Salisbury Street. Raleigh,
NC to review information on file- Addition-
al information on NPDES permits and this
notice may be found an our website:
http_ fdeq.nc.gov!abouUdivisionsiwater-
resou rces water-resources-
permits+wastewater-branch: npdes-
wastewater,'public-notices.or by calling
[phone]_
Town of Pembroke requested renews, of
permit NC0027103 for its Pembroke
WWTP in Robeson County. This permit-
ted discharge is treated domestic
wastewater to Lumber River, the Lumber
River Basin.
NCDENR 505116
t�tt11111E,�/.

PAT MCCRORY
Govrn+or
DONALD R. VAN DER VAART
scovhify
S. JAY ZIMMERMAN
(Jrrrcrur
Water Resources
E.N VIRONMIiNTA1. OIJALIT Y
MEMORANDUM
To:
From:
April 6, 2016
Diane Williams
NC DENR / DWR / Regional Engineer
Fayetteville Regional Office
Trupti Desai
919-807-6351
NPDES Unit
Subject: Review of Draft NPDES Permit NC0027103
Town of Pembroke WWTP
Robeson County
Please indicate below your agency's position or viewpoint on the draft permit and return this form by May 5, 2016. If
you have any questions on the draft permit, please feel free to contact me at the telephone number shown above.
RESPONSE: (Check one)
Signed
Concur with the issuance of this permit provided the facility is operated and maintained properly, the stated
effluent limits are met prior to discharge, and the discharge does not contravene the designated water quality
standards.
Concurs with issuance of the above permit, provided the following conditions are met:
Opposes the issuance of the above permit, based on reasons stated below, or attached:
v,...4t.v\ QL
Date: (i /2. f2/ D
State of North Carolina I Environmental Quality I Water Resources
1617 Mail service Center J Raleigh, North Carolina 27699-1617
919 807 6300

DEPARTMENT OF ENVIRIONMENTAL QUALITY / DIVISION OF WATER RESOURCES
FACT SHEET FOR NPDES PERMIT DEVELOPMENT
Town of Pembroke WWTP
NC0027103
Facility Information
Applicant/Facility Name:
Town of Pembroke Wastewater Treatment Plant
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:
Domestic
Classification:
in
Permit Status:
Renewal
County
Robeson
Miscellaneous
Receiving Stream:
Lumber River
Drainage Basin
Lumber
Stream Classification:
WS-IV , B, Sw, HQW
Sub -basin:
03-07-51
303(d) Listed?
No
HUC:
03040204
Drainage Area (mi2):
427
State Grid / USGS Quad:
122NW /Pembroke
Summer 7Q10 (cfs)
120
Latitude:
34° 39' 55" N
Winter 7Q10 (cfs)
-
Longitude:
79° 12' 00" W
30Q2 (cfs)
-
Regional Office:
Fayetteville
Trupti Desai
Average Flow (cfs):
387.74 (est USGS)
Permit Writer:
IWC (%):
1.7
Date:
5/3/2016
I. SUMMARY
The Town of Pembroke WWTP with a design capacity of 1.33 MGD serves an estimated population of 4200.
The treated wastewater is discharged to the Lumber River in the Lumber River Basin. The town has a separate
sewer system and currently working on developing a pretreatment program.
The Pembroke WWTP consists of influent collection sump, pumps, bar screen, grit chamber, flow
splitter boxes, oxidation ditches, clarifiers, chlorine contact chamber, cascade aeration system, sludge
digester and sludge holding tank, provides secondary treatment to the wastewater.
H. RECEIVING STREAM
The Lumber River in sub -basin 03-07-51 is classified as WS-IV, B, Sw, HQW in Little Pee Dee watershed,
HUC 03040204. It is not listed in 2016 203(d) list for any impairment.
III. DATA REVIEW AND VERIFICATION OF EXISTING CONDITIONS
A. DMR Review
DMRs were reviewed for the period of January, 2011 till December, 2015. The effluent data are summarized in
Table 1.
Table 1. Data Summa
Parameter
Units
Average
Max
Min
Flow
MGD
0.82
2.99
0.4
BOD
mg/1
5.02
55.1
0
DO
mg/1
8.42
10.3
6.36
NH3N
mg/1
0.90
15.3
0.04
TSS
mg/1
5.37
104
1.0
pH
S.U.
7.07
7.98
5.58
Hp.: 101 4

Parameter
Units
Average
Max
Min
Temperature
°C
21.97
30.1
12.9
TRC
µg/1
20.35
52.0
6.0
TN
mg/1
9.57
53.7
1.01
TP
mg/1
2.05
9.68
0.16
Fecal Coliform
#/100 ml
24
3600
0
B. Compliance History
The compliance history from January, 2011 to December, 2015 was reviewed. The facility had violated NPDES
permit by exceeding weekly average limit of TSS on 11/16/2013, weekly average limit of TSS and BOD on
11/23/2013 and monthly average limit of TSS on 11/30/2013. The notice of violation (NOV) was sent on
4/21/2014 and enforcement case was initiated on 6/23/2014. The enforcement case was closed on 7/28/2014
after receiving penalty and enforcement costs from the town. \
C. Permit Modification History
Previous permit was issued on October 1, 2009 and expired on July 31, 2014. The permit was modified twice
during this period. The first modification issued on March, 2011, removed effluent monitoring requirement for
cadmium due to the fact that influent to the WWTP was 100% domestic with no contributions from industrial
discharges and results of a Reasonable Potential Analysis (RPA) showed no potential to cause the water quality
standard for cadmium to be exceeded in the receiving stream.
Second permit modification was issued in March, 2014. The permittee requested this modification with the
NPDES permit renewal application. After evaluating 3 years' effluent monitoring data of the facility, the DWR
issued this modification reducing the effluent monitoring frequencies for BOD5, TSS, NH3-N and Fecal
Coliform from 3 time a week to 2 times a week. The facility's performance satisfied the criteria established in
the "DWR Guidance Regarding the Reduction of Monitoring Frequencies in NPDES Permits for Exceptionally
Performing Facilities".
D. Mercury Evaluation
The permittee is required to conduct mercury analysis of the effluent as a part of priority pollutant analysis
(PPA) using EPA method 1631. Table 2 summarizes the available mercury data used to determine
requirements.
Table 2. Mercury Evaluation
2011
2012
2013
# of Samples
1
1
1
Annual Average, ng/L
3.5
3.5
3
Maximum Value, ng/L
3.5
3.5
3.03
TBEL, ng/L
47
WQBEL, ng/L
355.3
The annual average concentration of mercury from 2011 to 2013 showed no potential to violate the
WQBEL of 355.3 ng/1 or TBEL of 47 ng/1 (See attached Mercury Evaluation Sheet). Therefore, no limit
will be implemented as per mercury TMDL guidance. The mercury concentrations were found above 1
ng/1 in all the PPAs but the permitted flow is below 2 MGD, hence, the mercury minimization plan is not
added to this permit. However, the facility will be required to monitor mercury once the state approves
the pretreatment program.
E. Reasonable Potential Analysis (RPA)
A reasonable potential analysis was conducted for zinc as its concentration was above detection level in all the
priority pollutant analyses. The zinc concentration varied from 38 to 81 µg/1 in three samples. However, the
RPA showed that zinc level was much lower than acute and chronic water quality standard. Hence, there is no
effluent limitation or monitoring requirements for this parameter (The results are of RPA are attached herewith).
Pax 2 of 4

F. Priority Pollutant Analysis
The facility has performed three priority pollutant analysis and their results are included in the permit renewal
application. Zinc and mercury levels were above quantification level. However, mercury and zinc analysis
showed no reasonable potential (See D. Mercury Evaluation and E. Reasonable Potential Analysis above).
G. Aquatic Toxicity Testing
Permit holder is required to perform quarterly Whole Effluent Toxicity (WET) test using Ceroidaphnia
Dubia at an effluent concentration of 1.7%. Total 20 WET tests were performed from January, 2011 to
December, 2015. The facility had passed all these tests. 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.
The permittee had requested one second species test per year during the permit period in the renewal
application. The municipal facilities that are also subject to the Effluent Pollutant Scan requirements are
subject to additional toxicity testing requirements under Federal Regulation 40 CFR 122.2(j)(5). The
permittee is required to submit four (4) second species test results with EPA Municipal Application Form
2A. (Refer A. (3) in the draft permit). The DWR did not change these requirements for the facility.
The facility will also continue the quarterly chronic toxicity limit testing as defined.
H. Instream Monitoring
The permittee conducts instream monitoring for temperature and dissolved oxygen at designated points
upstream and downstream from the discharge in the Lumber River. The upstream and downstream sample
results from 2011-2015 were reviewed and compared to evaluate the impact of the effluent. The data showed
that the effluent from this facility had no impact on the stream quality. The facility will continue instream
monitoring requirements as defined.
The permitted requested elimination of instream monitoring requirements for temperature and dissolved oxygen
in the permit renewal application. The DWR did not waive the instream monitoring requirement as this data is
important to assess the quality of the receiving waters (15A 2B.0508).
IV. LIMITS AND MONITORING REQUIREMENTS
Current conditions, as well as the basis for the limits are summarized in Table 3.
Table 3. Current Conditions and Proposed Changes
Parameter
Current Limit/Condition
Change
from
Previous
Permit
Basis for Condition/Change
Monthly
Average
Weekly
Average
Daily
Maximum
Flow
1.33 MGD
No Change
15A 2B .0505
BOD, 5-day, 20°
18.0 mg/1
27 mg/1
No Change
Waste load allocation in 1994
TSS
20.0 mg/1
30.0 mg/1
No Change
15A 2B.0200
Ammonia as Nitrogen
(NH3-N)
12.0 mg/1
35.0 mg/1
No Change
Based on a water quality model
Fecal Coliform
(Geometric mean)
200/100 ml
400/100m1
No Change
State WQ standards, 15A 2B .0200
DO
5 mg/1
No Change
State WQ standards, 15A 2B .0200
pH
Between 6.0 and 9.0 S.U.
No Change
State WQ standards, 15A 2B .0200
Total Residual Chlorine
28 µg/1
No Change
State WQ standards, 15A 2B .0200
Total Nitrogen/Total
Phosphorus
Monitoring only
No Change
15A 02B .0508
Effluent Pollutant Scan
Annual
3 Times
during the
permit
cycle
40 CFR 122
Page 3 of 4

V. OTHER PROPOSED CHANGES
To meet new federal regulations for electronic reporting, Special Condition A. (4) has been added describing
requirements for submittal of electronic DMRs.
VI. PROPOSED SCHEDULE FOR PERMIT ISSUANCE
Draft Permit to Public Notice: 5/3/2016
Permit Scheduled to Issue (tentative): 6/27 /2016
VH. STATE CONTACT INFORMATION
If you have any questions on any of the above information or on the attached permit, please contact
Trupti Desai at [phone] or [e-mail].
Copies of the following are attached to provide further information on the permit development:
• Draft permit
• Mercury analysis
• Reasonable Potential Analysis
NPDES Recommendation by:
Signature: Date: 5/3/2016
Addendum to Fact Sheet
EPA had requested additional information on copper reported on three effluent pollutant scans and
NPDES Implementation of Instream Dissolved Metals Criteria. Attached information was sent to Mr.
Craig Hesterlee on 5/19/2016
Trupti Desai
(5/19/2016)
Pap:4 ut 4

NC DIVISION OF WATER RESOURCES
NPDES Implementation of Instream Dissolved Metals Criteria
The NC 2007-2014 Water Quality Standard (WQS) Triennial Review was approved by the NC
Environmental Management Committee (EMC) on November 13, 2014. The US EPA subsequently
approved the WQS revisions on April 6, 2016 with some exceptions. All permits public noticed by the
NC Division of Water Resources NPDES Permitting Unit after April 6, 2016 shall include the
implementation of the approved 2007-2014 Triennial Review Rules for freshwater and saltwater water
quality criteria.
Table 1. NC Dissolved Metals Water Quality Criteria/Aquatic Life Protection
Parameter
Acute FW, ug/1
(Dissolved)
Chronic FW, ug/1
(Dissolved)
Acute SW, ug/1
(Dissolved)
Chronic SW, ug/1
(Dissolved)
Arsenic
340
150
69
36
Beryllium
65
6.5
---
---
Cadmium
Calculation
Calculation
40
8.8
Chromium III
Calculation
Calculation
---
---
Chromium VI
16
11
1100
50
Copper
Calculation
Calculation
4.8
3.1
Lead
Calculation
Calculation
210
8.1
Nickel
Calculation
Calculation
74
8.2
Silver
Calculation
0.06
1.9
0.1
Zinc
Calculation
Calculation
90
81
Table 1 Notes:
1. FW= Freshwater, SW= Saltwater
2. Calculation = Hardness dependent criteria
3. Only the aquatic life criteria listed above are in dissolved form. Mercury and selenium criteria
have been retained as Total Metals criteria due to bioaccumulative concerns. It is still necessary
to evaluate total recoverable criteria for human health. NC has also retained the existing toxic
criteria listed in 15A NCAC 2B.0200 (e.g., arsenic at 10 ug/1 for human health protection),
cyanide, fluoride.
Table 2. Dissolved Freshwater Standards for Hardness -Dependent Metals
The Water Effects Ratio (WER) is equal to one unless determined otherwise under 15A
NCAC 02B .0211 Subparagraph (11)(d)
Metal
NC Dissolved Standard, ug/1
Cadmium, Acute
{1.136672-[ln hardness](0.041838)) • e^{0.9151 [in hardness]-3.1485)
Cadmium, Acute
Trout waters
{1.136672-[ln hardness](0.041838)} • e^{0.9151[In hardness]-3.6236)
Cadmium, Chronic
{1.101672-[In hardness](0.041838)) • e^{0.7998[ln hardness]-4.4451 }
Chromium III, Acute
0.316 • e^{0.8190[ln hardness]+3.7256}
Chromium III,
Chronic
0.860 • e^{0.8190[ln hardness]+0.6848}
Copper, Acute
0.960 • e^{0.9422[In hardness]-1.700}
Copper, Chronic
0.960 • e^{0.8545[ln hardness]-1.702}
Lead, Acute
{ 1.46203-[ln hardness](0.145712)} • e^{ 1.273[In hardness]-1.460}
Lead, Chronic
{1.46203-[In hardness](0.145712)} • e^{1.273[ln hardness]-4.705)
Page 1 of 4

Nickel, Acute
0.998 • e^{0.8460[In hardness]+2.255
Nickel, Chronic
0.997 • e^{0.8460[In hardness]+0.0584}
Silver, Acute
0.85 • e^{1.72[ln hardness]-6.59}
Silver, Chronic
Not applicable
Zinc, Acute
0.978 • e^{0.8473[ln hardness]+0.884}
Zinc, Chronic
0.986 • e^[0.8473[In hardness]+0.884}
RPA Permitting Guidance/WQBELs for Hardness -Dependent Metals - Freshwater
The Reasonable Potential Analysis (RPA) is designed to calculate the allowable instream concentrations
for permit limitations. Limitations are required based upon a showing of "reasonable potential" to exceed
water quality standards. If monitoring for a particular pollutant indicates that the pollutant is not present
(i.e. consistently below detection level), then the Division may remove the monitoring requirement in the
reissued permit.
1. To perform a RPA on the Freshwater hardness -dependent metals the Permit Writer compiles the
following information:
• Critical low flow of the receiving stream, 7Q10 (the spreadsheet automatically calculates
the 1Q10 using the formula 1Q10 = 0.843 (7Q10) "3)
• The mean annual receiving stream flow (QA), for carcinogen comparisons against HH
criteria
• The minimum average flow over 30 consecutive days that has an average recurrence of
once in two years (30Q2) in the receiving stream, for comparisons against aesthetic
standards
• effluent hardness and upstream hardness, site -specific data is preferred
• Permitted flow
• Receiving stream classification
2. The chronic Aquatic Life water quality criteria is converted from total recoverable metal at lab
conditions to dissolved lab conditions for the following metals: cadmium, copper, lead, nickel,
zinc, and trivalent chromium. EPA default partition coefficients, or site -specific translators
developed using federally approved methodology, are used in the RPA spreadsheet to convert the
dissolved lab conditions to a total recoverable metal at ambient conditions.
3. The acute Aquatic Life water quality criteria is converted from total recoverable metal at lab
conditions to dissolved lab conditions for the following metals: cadmium, copper, lead, nickel,
zinc, silver and trivalent chromium. EPA default partition coefficients, or site -specific translators
developed using federally approved methodology, are used in the RPA spreadsheet to convert the
dissolved lab conditions to a total recoverable metal at ambient conditions.
4. For criteria that are hardness dependent, site -specific hardness data (effluent and upstream) is best
to evaluate chronic and acute concentrations. The permit writer will first review DMR's, Effluent
Pollutant Scans, and Toxicity Test results for any hardness data and then contact the Permittee to
see if any additional data is available for instream hardness values, upstream of the discharge.
If no hardness data is available, the permit writer may choose to do an initial evaluation using a
default hardness of 25 mg/L and total suspended solids (TSS) of 10 mg/L to see if the permittee is
impacted. Minimum and maximum limits on the hardness value used for water quality
calculations are 25 mg/L and 400 mg/L respectively. The minimum TSS value used for EPA
partition coefficients is 10 mg/L.
Page 2 of 4

If the use of a default hardness value results in a hardness -dependent metal showing reasonable
potential to violate water quality criteria the permit writer should contact the Permittee and
request 5 site -specific effluent and upstream hardness samples.
The overall hardness value used in the water quality calculations is calculated as follows:
Combined Hardness (chronic)
= (Permitted Flow*Avg. Effluent Hardness) x (7Q10 S*Avg. Upstream Hardness)
(Permitted flow + 7Q10 S)
The Combined Hardness for acute is the same but the calculation uses the 1Q10 flow.
5. EPA default partition coefficients or the "Fraction Dissolved" converts the value for dissolved
metal at laboratory conditions to total recoverable metal at in -stream ambient conditions. This
factor is calculated using the linear partition coefficients found in The Metals Translator:
Guidance for Calculating a Total Recoverable Permit Limit from a Dissolved Criterion (EPA
823-B-96-007, June 1996) and the equation:
Cdiss = 1
Ctotai 1 + { [Kpo] [sso+al [10 6] }
Where: ss = in -stream suspended solids concentration [mg/1], minimum of 10 mg/L used
Kpo and a = constants that express the equilibrium relationship between dissolved and
adsorbed forms of metals. A list of constants used for each hardness -dependent metal can
also be found in the RPA program under a sheet labeled DPCs.
6. The dissolved hardness -dependent metals calculations are divided by the default partition
coefficients (or translators) to obtain a Total Recoverable Metal at ambient conditions. Dissolved
metals that do not have translators or default partition coefficients are divided by one. All other
standards (HH, WS, non -hardness dependent metals) are automatically shown in Table 2 of the
RPA spreadsheet when the program is initiated.
7. The standards, criteria, and calculated Total Recoverable metals listed in Table 2 of the RPA
spreadsheet are inserted into a mass balance equation to determine the total allowable
concentration (permit limits) for each pollutant using the following equation:
Ca = (s7Q10 + Qw) (Cwqs) — (s7Q 10) (Cb)
Qw
Where: Ca = allowable effluent concentration (µg/L or mg/L)
Cwqs = NC Water Quality Standard or federal criteria
Cb = background concentration (assume zero for all toxicants except NH3)*
Qw = permitted effluent flow
S7Q 10 = summer low flow used to protect aquatic life from chronic toxicity and human
health through the consumption of water, fish, and shellfish from noncarcinogens
* Discussions are on -going with EPA on how best to address background concentrations
Flows other than S7Q10 may be incorporated as applicable:
1Q10 = used in the equation to protect aquatic life from acute toxicity
QA = used in the equation to protect human health through the consumption of water, fish,
and shellfish from carcinogens
30Q2 = used in the equation to protect aesthetic quality
The total allowable concentration (permit limits) are shown on the "RPA Sheet" in the RPA
spreadsheet.
Page 3 of 4

8. Effluent toxicant data is entered into the "Data Sheet." of the RPA spreadsheet which uses
statistics to estimate the 95th percentile concentration of each pollutant. These concentrations are
listed as the Predicted max concentrations on the "RPA Sheet" in the RPA spreadsheet. The
Predicted Max concentrations are compared to the Total allowable acute and chronic
concentrations to determine if a permit limit is necessary. This is in accordance with the U.S.
EPA Technical Support Document for Water Quality -Based Toxics Control published in 1991.
9. Effluent hardness sampling and instream hardness sampling, upstream of the discharge, is being
inserted into all permits with facilities monitoring for hardness -dependent metals to build a more
robust hardness dataset.
10. Hardness and flow values used in the Reasonable Potential Analysis for this permit included:
Parameter
Value
Comments
Effluent Hardness (mg/L)
[Total as, CaCO3 or (Ca+Mg)]
38.33 mg/L
Average of 3 Effluent Pollutant
Scans
Upstream Hardness (mg/L)
[Total as, CaCO3 or (Ca+Mg)]
25 mg/L
Default value
7Q10 summer (cfs)
120
1 Q 10 (cfs)
97.83
Permitted Flow (MGD)
1.33
11. The Total Chromium NC WQS was removed and replaced with trivalent chromium and
hexavalent chromium WQC. Effluent sampling data on Total Chromium is used as a surrogate
parameter to assess if limitations and/or sampling are required for trivalent or hexavalent
chromium.
Comments: This facility does not have a Pretreatment Program and does not sample routinely for
hardness -dependent metals. However, there were metals data included with their Effluent Pollutant Scans.
All metals reported showed concentrations less than detection levels except for copper and zinc. Copper
concentration was 20.0 µg/1 in all three effluent pollutant scans and zinc was reported at the following
concentrations: 38 µg/1 on 1/6/2011; 81 µg/1 on 6/19/2012; 48 µg/1 on 4/16/2013.
These concentrations were compared against the total copper and total zinc allowable limitations
determined in the RPA using the hardness and flow data listed above. The copper and zinc effluent
concentrations did not show reasonable potential to violate WQC.
Date: 5/19/2016
Permit Writer: Trupti Desai
Page 4 of 4

Town of Pembroke
NC0027103
Outfall 001
Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators Qw = 1.33 MGD
MAXIMUM DATA POINTS = 58
Qw (MGD1 1.33
1Q10S (cfs) - 97.83
7Q10S (cfs) = 120.00
7Q10W (cfs) = 0.00
30Q2 (cfs) = 0.00
Avg. Stream Flow, QA (cfs) = 384.74
Receivin6 Stream: Lumber River HUC Lumber River Basin
YOU HAVE DESIGNATED THIS RECEIVING
STREAM AS HOW OR ORW
W WTP/WTP Class: Town of Pembroke WWTP/ CON1BINED HARDNESS imZ/LZ
IWC% @ 1Q10S = 2.063739157 Acute = 25.28 mg/L
IWC% @ 7Q10S = 1.688902725 Chronic = 25.23 mg/L
IWC% @ 7Q10W = 100
IWC% @ 30Q2 = 100
IW%C @ QA = 0.532960705
Stream Class: WS-IV, B, Ws, HOW
PARAMETER
TYPE
(1)
STANDARDS & CRITERIA (2)
PQL
z
D
REASONABLE POTENTIAL RESULTS
RECOMMENDED ACTION
NC WQS /
Chronic
Applied
Standard
%z FAV /
Acute
n # Det. Max Pred C\\ Allowable Cv.'
Zinc
NC
63.8500
FW(7Q10s)
63.4383
ug/L
3 3
Note: n < ')
Limited 1
set
243.0
iv r ;!! r
\
Acute: 3,073.9
--_ _ -_Chronic: 3,78_____
-
0.6
No value> Allowable CO3•
No limit and monrtonng
_________________________
Acute:
Chronic:
n n
N \
Acute:
--Chronic:_ _ _ -----------
— ----— —
------
Acute:
Chronic:---------------------------------
—— —
NIA
Acute:
— — — — — —
Chronic:
— — — — — — — — — —
Page 1 of 1
0027103 RPA for Zinc Latest Version. rpa
5/3/2016

Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators
MAXIMUM DATA POINTS = 58
REQUIRED DATA ENTRY
Table 1. Project Information
Facility Name
WWTP/WTP Class
NPDES Permit
Outfall
Flow, Qw (MGD)
Receiving Stream
HUC Number
Stream Class
tE CHECK IF HQW OR ORW WQS
Town of Pembroke
Town of Pembroke WWTP/III
NC0027103
001
1.330
Lumber River
Lumber River Basin
WS-IV, B, Ws, HQW
]Apply W5 Hardness WQC
7Q10s (cfs)
7Q10w (cfs)
30Q2 (cfs)
QA (cfs)
1Q10s (cfs)
Effluent Hardness
Upstream Hardness
Combined Hardness Chronic
Combined Hardness Acute
Data Source(s)
120.00
0.00
0.00
384.74
97.83 aid
38.3333333333333 mg/L (Avg)
default 25 mg/L (Upstream Hard Avg = 25 mg/L)
25.23 mg/L
25.28 mg/L
❑CHECK TO APPLY MODEL
Table 2. Parameters of Concern
Par01
Par02
Par03
Par04
Par05
Par06
Par07
Par08
Par09
Par10
Peril
Par12
Par13
Par14
Par15
Par16
Par17
Par18
Par19
Par20
Par21
Par22
Par23
Par24
Name
was
fyPe
Chronic Mad liar
Acute
PQL Units
Arsenic
Aquactic Life
C
150
FW
340
ug/L
Arsenic.
Human Health
Water Supply
C
10
HH/WS
N/A
ug/L
Beryllium
Aquatic Life
NC
6.5
FW
65
ug/L
Cadmium
Aq:.ai,,- i ,
NC
0.5939
FW
3.2707
ugiL
Chlorides
NC
230
FW
mg/L
Chlorinated Phenolic Compounds
Water supply
NC
1
A
ug/L
yTotal Phenolic Compounds
Aquatic Lite
NC
300
A
ug/L
Chromium III
Aquatic Life
NC
118.6004
FW
913.2325
ug/L
Chromium VI
Aquatic Life
NC
11
FW
16
ug/I_
Chromium. Total
Aquatic Life
NC
N/A
FW
N/A
ug/I
Copper
Aquatic Lde
NC
7.9413
FW
10.5806
ugiL
Cyanide
Aquatic Life
NC
5
FW
22
10
ug/L
Fluoride
Aquatic Life
NC
1,800
FW
ug/L
Lead
Aquatic Lde
NC
2.9715
FW
76.4234
ug/L
Mercury
Aquatic Life
NC
12
FW
0.5
nglL
Molybdenum
Human Hearn
NC
2000
HH
ug/L
Nickel
Aquatic Life
NC
37.5149
FW
338.3274
pg/L
Nickel
Water Supply
NC
25.0000
WS
N/A
ug/L
Selenium
Aquatic Life
NC
5
FW
56
ug/L
Silver
Aquatic Life
NC
0.06
FW
0 3020
ug/L
Zinc
Aquatic Life
NC
127.7000
FW
126.8765
ug/L
0027103 RPA for Zinc Latest Version, input
5/3/2016

REASONABLE POTENTIAL ANALYSIS
H1
Effluent Hardness
'PASTE SPECIAM
es" then "COPY"
• Maximum data
Date Data
1 /6/2011 39
4/19/2012 37
4/16/2013 39
BDL=1/2DL Results
39 Std Dev. 1.1547
37 Mean 38.3333
39 C.V. (default) 0.6000
n 3
10th Per value 37.40 m9lL
Average Value 38.33 mg/L
Max. Value 39.00 mg/L
H2
Upstream Hardness
flats riots
25
`PASTE SPECIAL•
slues" then "COPY"
. Maximum data
BDL=1/2DL Results
25 Std Dev. N/A
Mean 25.0000
C.V. 0.0000
n 1
10th Per value 25.00 mg/L
Average Value 25.00 mg/L
Max. Value 25.00 mg/L
0027103 RPA for Zinc Latest Version, data
- 1 - 5/3/2016

REASONABLE POTENTIAL ANALYSIS
Par21
Zinc
Date Data BDL=I/2DL Results
1 1/1/2011 38 38 Std Dev.
2 1/1/2012 81 81 Mean
3 1/1/2013 48 48 C.V. (default)
4 n
5
6 Mult Factor =
7 Max. Value
8 Max. Pred Cw
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use "PASTE SPECIAL.
Values" then "COPY"
Maximum data
points • 58
22.5019
55.6667
0.6000
3
3.00
81.0 ugiL
243.0 ug/L
0027103 RPA for Zinc Latest Version, data
2 5/3/2016

5/3/16
WQS = 6 ng/L
Facility Name: Town of Pembroke WWTP
MERCURY WQBEL/TBEL EVALUATION V:2013-5
Total Mercury 1631E PQL = 0.5 ng/L 7Q10s =
Date Modifier Data Entry Value Permitted Flow =
1/6/11
4/19/12
4/16/13
<
6.99
6.99
3.03
No Limit Required
No MMP Required
3.495
3.495
3.03
120.000
1.330
cts
WQBEL = 355.26 ng/L
47 ng/L
3.5 ng/L - Annual Average for 2011
3.5 ng/L - Annual Average for 2012
3.0 ng/L - Annual Average for 2013

r 1l149/MIhlf
kifer-3-7-51M-
00 Sfa FF Apr N C,W 103
MEMORANDUM
TO:
DIVISION OF WATER QUALITY
Tom Belnick
Point Source Branch
NuatkiteitOri P44 hipl
FROM: Mark Brantley, Environmental Senior Specialist
THROUGH: Belinda S. Henson, Regional Supervisor
Water Quality Regional Operations Section
Fayetteville Regional Office
SUBJECT: Application for NPDES Perim
Pembroke Wastewater Treatme
PO Box 866
8257 Deep Branch Road
Pembroke, NC 28372
Robeson County
9tivAv-cyry
v103
rp@M[71E
FER 1 0 7 01 4
POINT SOURCE BRAN(.
Please find enclosed a staff report and recommendations from the Fayetteville Regional
Office concerning the application for a new NPDES Permit.
If you have any questions or require any further information, please advise.
/KMB
Enclosures

To: Complex Permitting Section
Point Source Branch
Attention: Tom Belnick
Date: February 6, 2014
NPDES STAFF REP RECOMMENDATION
COUNTY: R eson
Permit No.: C0027103
PART 1— GENERAL INFORMATION
1. Facility and Address: Pembroke Wastewater Treatment Plant
PO Box 866
8257 Deep Branch Road
Pembroke, NC 28372
2. Date of Investigation: February 6, 2014
3. Report Prepared by: Mark Brantley, Environmental Senior Specialist, FRO
4. Person Contacted and Telephone Number:
Rhonda Locklear [phone]
5. Directions to Site:
From Fayetteville, travel on Hwy 95 South, pass through Lumberton, then turn right on
Exit 17 (Hwy 711). Turn left onto Deep Branch Road (immediately after passing the
Department of Correction facility, travel straight approximately five miles. The
Pembroke Wastewater Treatment Plant will be on the left.
6. Discharge Point(s), List for all discharge points:
Latitude: 34°39'55" N Longitude: 79°12'00" WI
Attach a U.S.G.S. map extract and indicate the treatment facility site and the discharge point on
the map.
U.S.G.S. Quad No.
U.S.G.S. Quad Name:
I 22 NWI
Pembroke, N.C.

7. Site size and expansion area consistent with the application?
`Yes.
8. Receiving stream or affected surface waters:
a. Classification: [Lumber River Index Number 14-(7) Primary Classification WS-IV, B
Secondary Classification Sw, HQW
b. River Basin No. Lumber River 03-07-51 and Sub basin No.:
LUM51
c. Describe receiving stream features and the pertinent downstream uses:
It is classified as Class WS-IV, B, Sw, HQW waters, which promotes aquatic life
propagation and survival, fishing, wildlife, primary recreation, and agriculture,
and waters used as sources for potable water supply.
PART II - DISCRIPTION OF WASTES AND TREATMENT WORKS
Volume of wastewater to be permitted:
(Ultimate Design Capacity)
What is the current permitted capacity of the Wastewater Treatment facility?
1.33 MGD[
1.33 MGD[
Actual treatment capacity of the current facility (current design capacity)?
1.33 MGD
Please provide a description of the existing or substantially constructed
wastewater treatment facility:
The raw wastewater flows into the Influent Pump Station, then through a
Mechanical Bar Screen (or a Manual bar screen), and then into Pre -aeration and
Grit/Grease removal. It then flows through a splitter box into one of two
oxidation ditches and one of two clarifiers. Then it flows into the chlorine
contact chamber and dechlorination, and finally the Cascade Step Aeration. The
facility has a 500,000 gallon digester. Sludge is aerobically digested. Once the
digester is full and decanting is complete the sludge is disposed of through
Atlantic Dewatering for composting.
e. Possible toxic impacts to the surface waters:
lone
2. Residuals handling and utilizing/disposal scheme:
a. If residuals are being land applied, please specify the DWQ Permit No.
Residual Contractor:
[Atlantic Dewatering

Telephone:
b. Residual stabilization:
c. Landfill:
IN/AI
!N/Ai
f. Other disposal/utilization scheme (specify):
IN/Al
3. Treatment plant classification (attach completed rating sheet):
4. Alternative Analysis Evaluation:
Has the facility evaluated all of the non -discharge options available?
regional perspective for each of the options that were evaluated.
Connection to Regional Sewer System:
Land Application:
Water Reuse:
none evaluated
none evaluated
none evaluated
Please provide the
PART IV — EVALUATION AND RECOMMENDATIONS
1. The applicant is not requesting modification of the facility or increasing flow at this time.
2. A review of the compliance data did not reveal any significant violations.
3. All units were in service based upon the previous Compliance Evaluation Inspection
(CEI) that was conducted on February 6, 2014,.
4. Based upon the above information, this Office recommends reissuance of the said permit
for the continued operation of an existing 1.33 MGD wastewater treatment facility
consisting of influent pumps, mechanical bar screen, grit chamber, Dual oxidation
ditches, Dual clarifiers, Chlorine contact chamber, Dechlorination, Cascade aeration, and
Sludge digester located at the Pembroke Wastewater Treatment plant, southeast of the
Town of Pembroke, in Robeson County.

7,013 Reriewt/.QAe(
Town of Pembroke
POST OFFICE BOX 866
PEMBROKE, NORTH CAROLINA
28372
MILTON R. HUNT
MAYOR
ORYAN D. LOWRY
MANAGER
AMIRA HUNT
CLERK
December 23, 2013
NC Department of Environment and Natural Resources
Division of Water Quality/NPDES Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
Dear Permitting Unit:
COUNCILMEN:
LARRY BROOKS
ALLEN G. DIAL
RYAN SAMPSON
Subject: NPDES Permit Renewal
Town of Pembroke
NPDES Permit #NC0027103
Robeson County
The Town of Pembroke is submitting the renewal application for NPDES permit #NC0027103.
The permit application consists of:
Cover letter
- One original of Form 2A — NPDES Application for Permit Renewal
- Supplemental Application Information — Parts D & E
Topographic Map
Process Flow Schematic
Annual Pollutant Scan for the years 2011, 2012, and 2013
Two copies of Form 2A — NPDES Application for Permit Renewal

The Town was unaware that a second species toxicity test was required for the permit renewal.
Once we were told of this requirement, we made arrangements to conduct the tests. One second
species test has been concluded and the other three are scheduled to be concluded prior to permit
expiration.
The Town would like to request that the following modifications be made to the permit:
We request that monitoring for BOD, TSS, Ammonia Nitrogen and Fecal Coliform be
reduced under the "exceptionally performing facilities" criteria. The attached data
(summarized in the following table) indicates that the WWTP effluent has exceeded the
minimum criteria for reduced monitoring. In addition to the monitoring results, the plant
meets the other listed criteria.
Analysis of testing results for the past three Years:
- Percent of Monthly Average Limit
Parameter
Monthly Limit
3-Year Average
% of Limit
BOD5
18.0 mg/L
4.6 mg/L
24%
TSS
20.0 mg/L
2.4 mg/L
12%
Ammonia N
12.0 mg/L
0.55 mg/L
12%
Fecal Coliform
200/100 ml
3 colonies/100 ml
2%
- Number of Samples Over 200% of Monthly Average Limit
Parameter
200% of Monthly Limit
Number of Samples Over
BOD5
36 mg/L
0
TSS
40 mg/L
3
Ammonia N
24.0 mg/L
0
Four (4) Fecal Co
iforms exceeded 200% of the weekly average limit
It is requested
monitoring the
that upstream/downstream monitoring be eliminated. We feel that
stream for temperature and dissolved oxygen provides no useful data
regarding the WWTP impacts upon the receiving waters. Permit limitations are issued to
protect water quality, including a minimum effluent dissolved oxygen. "Outside"
influences such as stormwater runoff and reduced velocity in the swampy areas that are
subject to decay and placid conditions makes taking dissolved oxygen levels
temperatures inconclusive in determining wastewater impacts
If second species monitoring is to be continued to be required for permit renewal,
request that one per year be included in the permit.
1°

We thank you for your consideration in these matters. If you have any additional questions or
comments, please call Rhonda Locklear at 910/521-2989.
Sincerely,
`1vicy.-k I LQ,
Marie Moore, Manager
Town of Pembroke
Lev`-14/ Vr
ilv
. 'k\ , A�L
evN.

Attachment Order 2-b:
Town of Pembroke NC0027103
Process Flow Diagram
Clari tics \\
Generator
Office/Lab
Mechanical
/Manual
Screening
_______,,
Grit/
Grease
removal
Pre -
Aeration
.53 MGD
Oxidation
Ditch
.53 MGD
Oxidation
Ditch
RAS/WAS
Pump
Room
2-40hp
pumps
Waste Sludge
.5 MUD
Digester
Influent Flow
.83 MGD
Return Activated Sludge
SO2
Cl2
(6H\
Pumps
Influent
Pump Station
Digester
Return
Line
Chlorine Contact
Effluent
Discharge
.83 MGD

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Three Year Data Summary - Pembroke NC0027103