NC0043532_Fact Sheet_20181019

Fact Sheet
NPDES Permit No. NCO043532
Permit Writer/Email Contact David Hill, [e-mail]:
Date: April 17, 2018
Division/Branch: NC Division of Water Resources/NPDES Complex Permitting
Fact Sheet Template: Version 09Jan2017
Permitting Action:
❑ Renewal
® Renewal with Expansion
❑ New Discharge
❑ Modification (Fact Sheet should be tailored to mod request)
Note: A complete application should include the following:
• For New Dischargers, EPA Form 2A or 2D requirements, Engineering Alternatives Analysis, Fee
• For Existing Dischargers (POTW), EPA Form 2A, 3 effluent pollutant scans, 4 2" a species WET
tests.
• For Existing Dischargers (Non-POTW), EPA Form 2C with correct analytical requirements based
on industry category.
Complete applicable sections below. If not applicable, enter NA.
1. Basic Facility Information
Facility Information
Applicant/Facility Name:
Stanly County/West Stanly WWTP (formerly Oakboro WWTP)
Applicant Address:
1000 North First Street, Albemarle, NC 29001
Facility Address:
24939-B Barbee's Grove Road, Oakboro, NC 28129
Permitted Flow:
0.9 MGD/Expansion 1.2 MGD
Facility Type/Waste:
MINOR Municipal; 100% domestic (Upon Expansion MAJOR
Municipal)
Facility Class:
Class 3
Treatment Units:
Bar Screen, Activated Sludge/Aeration, Disinfection
Pretreatment Program (Y/N)
N
County:
Stanly
Region
Mooresville
Briefly describe the proposed permitting action and facility background: Stanly County has applied for
an NPDES permit renewal for 0.9 MGD, and for a modification to rerate the existing facility to
expand in the future to 1.2 MGD, for the West Stanly WWTP (formerly Oakboro WWTP) in
February 2014. The application included the required EAA for the expansion. This facility serves
Page 1 of 11

as a regional facility for a population of 6,400 residents for the communities of Oakboro, Stanfield,
and Locust.
The facility has a primary Outfall 002 and an emergency Outfall 001, each outfall impacts different
receiving streams. Discharge from Outfall 002 requires the operation of effluent pumps to transfer
the treated wastewater via a pressure sewer to Rocky River. Discharge from Outfall 001 is an
emergency gravity overflow from the effluent pump station to Long Creek. Mechanical issues that
have resulted in the historical episodic discharge from the emergency overflow will be resolved as
part of the expansion design/constructions. Upon expansion to 1.2 MGD the facility's Outfall 001
will be no longer be considered as an active discharge.
This segment of the Yadkin -Pee Dee River that receives the discharge from Outfalls 001 and 002 is
downstream from High Rock Lake. West Stanly is an active member of the Yadkin -Pee Dee River
Basin Association.
A speculative letter was issued in 2005 for a proposed expansion to 1.2 MGD for this facility based
on a QUAL2E model prepared for Rocky River and Mallard Creek. The speculative limits are still
valid and will be applied in this permit.
2. Receivine Waterbodv Information:
Receiving Waterbody Information
Outfalls/Receiving Stream(s):
Outfall 001 — Long Creek
Outfall 002 - Rocky River
Stream Segment:
11-17-31
13-17
Stream Classification:
C
C
Drainage Area (mi2):
192.5
965
Summer 7Q10 (cfs)
3.3
29
Winter 7Q10 (cfs):
5.8
51
30Q2 (cfs):
-
-
Average Flow (cfs):
183
920
IWC (% effluent):
30% at 0.9 MGD
4.6% at 0.9 MGD
6.0% at 1.2 MGD
303(d) listed/parameter:
Yes, the segment is listed in
the 2016 303(d) for Copper
impairment
Yes, the segment is listed in
the 2016 303(d) for Copper
and Zinc impairments IR
Category 5e
Subject to TMDL/parameter:
Yes- State wide Mercury TMDL implementation.
Subbasin/HUC:
Yadkin -Pee Dee; 03040105
USGS Topo Quad:
G17NE
Page 2 of 11

3. Effluent Data Summary
Effluent data for Outfa11002 is summarized below for the period of March 2016 through November 2017.
Table 1. Effluent Data Summary Outfall 002
Permit
Parameter
Units
Average
Max
Min
Limit
Flow
MGD ' 0.456
2.41
0.24
MA 0.9
WA 13.5
BOD summer
mg/1 5.89
56.0
< 2
MA 9.0
WA 27.0
BOD winter
mg/1
15.23
383.0
< 2
MA 18.0
WA 9.0
NH3N summer
mg/l
1.08
13.2
0.04
MA 3.0
WA 18.0
NH3N winter
mg/l
2.64
33.8
< 0.04
MA 6.0
WA 45.0
TSS
mg/l
15.67
973.0
< 2.5
MA 30.0
. _._.........
....................
6.0 > pH <
pH
SU
6.87
7.5
6.0
9.0
(geometric)
Fecal coliform
#/100 ml
399
> 8600
< 1
WA 400
MA 200
DO
mg/1
8.77
14.6
5.9
DA >5.0
TRC
µg/l
20.1
479
< 10
DM 28.0
Temperature
° C
17.77
26.7
6.1
TN
mg/l
20.43
35.2
5.2
TP
mg/1
2.74
4.78
0.2
Total Copper
mg/l
10.5
14
< 10
Total Zinc
mg/1
Only two values: 54, 82
MA -Monthly Average, WA -Weekly Average, DM -Daily Maximum, DA=Daily Average
Page 3 of 11

4. Instream Data Summary
Instream monitoring may be required in certain situations, for example: 1) to verify model predictions
when model results for instream DO are within 1 mg/l of instream standard at full permitted flow; 2) to
verify model predictions for outfall diffuser; 3) to provide data for future TMDL; 4) based on other
instream concerns. Instream monitoring may be conducted by the Permittee, and there are also
Monitoring Coalitions established in several basins that conduct instream sampling for the Permittee (in
which case instream monitoring is waived in the permit as long as coalition membership is maintained).
If applicable, summarize any instream data and what instream monitoring will be proposed for this
permit action: The current permit requires instream monitoring for dissolved oxygen and
temperature. West Stanly is a member of the Yadkin -Pee Dee River Basin Association and as such
instream monitoring was waived. Currently there are no instream monitoring stations active
downstream of either outfall.
Is this facility a member of a Monitoring Coalition with waived instream monitoring (YIN): Yes
Name of Monitoring Coalition: Yadkin -Pee Dee River Basin Association
5. Compliance Summary
Summarize the compliance record with permit effluent limits (past 5 years): During Oakboro
ownership, February 2010 to February 2014, there were 29 limit violations. Oakboro paid $1,363 in
fines. Since the transfer of ownership to Stanly County in March 2014 the facility has had 53 limit
violations (BOD, ammonia, TSS, fecal coliform) and paid $10,480 in fines.
Summarize the compliance record with aquatic toxicity test limits and any second species test results
(past 5 years): The facility passed 20 of the last 20 quarterly chronic toxicity tests (14 under current
permittee Stanly County). As a minor facility, no second species testing is required.
Summarize the results from the most recent compliance inspection: The last facility inspection
conducted in 2016 reported that the facility was having operational issues from high influent BOD
and N113-N loading, and visible effluent clarity issues, as the result of a recently accepted
wastewater stream from Enterprises Rendering. Acceptance of the Enterprise Rendering
wastewater was terminated by the Permittee at the direction of The Mooresville Regional Office.
6. Water Quality -Based Effluent Limitations (WQBELs)
Dilution and Mixing Zones
In accordance with 15A NCAC 213.0206, the following streamflows are used for dilution considerations
for development of WQBELs: 1 Q10 streamflow (acute Aquatic Life); 7Q 10 streamflow (chronic Aquatic
Life; non -carcinogen HIT); 30Q2 streamflow (aesthetics); annual average flow (carcinogen, HI).
If applicable, describe any other dilution factors considered (e.g., based on CORMIX model results): NA
If applicable, describe any mixing zones established in accordance with 15A NCAC 2B. 0204(b): NA
Oxygen -Consuming Waste Limitations
Limitations for oxygen -consuming waste (e.g., BOD) are generally based on water quality modeling to
ensure protection of the instream dissolved oxygen (DO) water quality standard. Secondary TBEL limits
Page 4 of 11

(e.g., BOD= 30 mg/1 for Municipals) may be appropriate if deemed more stringent based on dilution and
model results.
Ifpermit limits are more stringent than TBELs, describe how limits were developed. Limitations for 0.9
MGD to Outfall 002 for BOD and NH3-N are based on a Streeter Phelps model (Level B) for
instream DO protection. No changes are proposed from the previous permit limits.
In 2005 a QUAL2E model was prepared for Rocky River and Mallard Creek applying a 1.2 MGD
discharge from this facility. The resulting limits are defined in Table 1.2 MGD and will be applied
to Outfall 002:
Table 2. 1.2 MGD
Effluent Characteristics
Monthlv
Avera e
Weekly
Avera a
Minimum Limit
BOD, year round
10.0 L
15.0 m
NH3-N, year round
4.0 m L
12.0 m L
DO, year round
6.0 m L, daily avera e
Ammonia and Total Residual Chlorine Limitations
Limitations for ammonia are based on protection of aquatic life utilizing an ammonia chronic criterion of
1.0 mg/1(summer) and 1.8 mg/1(winter). Acute ammonia limits are derived from chronic criteria,
utilizing a multiplication factor of 3 for Municipals and a multiplication factor of 5 for Non -Municipals.
Limitations for Total Residual Chlorine (TRC) are based on the NC water quality standard for protection
of aquatic life (17 ug/1) and capped at 28 ug/l (acute impacts). Due to analytical issues, all TRC values
reported below 50 ug/1 are considered compliant with their permit limit.
Describe any proposed changes to ammonia and/or TRC limits for this permit renewal: There are no
proposed changes for the current 0.9 MGD flow.
Reasonable Potential Analysis (RPA) for Toxicants
If applicable, conduct RPA analysis and complete information below.
The need for toxicant limits is based upon a demonstration of reasonable potential to exceed water quality
standards, a statistical evaluation that is conducted during every permit renewal utilizing the most recent
effluent data for each outfall. The RPA is conducted in accordance with 40 CFR 122.44 (d) (i). The NC
RPA procedure utilizes the following: 1) 95% Confidence Level/95% Probability; 2) assumption of zero
background; 3) use of 1/2 detection limit for "less than" values; and 4) stream flows used for dilution
consideration based on 15A NCAC 2B.0206. Effective April 6, 2016, NC began implementation of
dissolved metals criteria in the RPA process in accordance with guidance titled NPDES Implementation of
Instream Dissolved Metals Standards, dated June 10, 2016.
A reasonable potential analysis was conducted on effluent toxicant data collected between May 2013 and
November 2017. Pollutants of concern included toxicants with positive detections and associated water
quality standards/criteria. Based on this analysis, the following permitting actions are proposed for this
permit:
• Effluent Limit with Monitoring. The following parameters will receive a water quality -based
effluent limit (WQBEL) since they demonstrated a reasonable potential to exceed applicable
water quality standards/criteria: None
Page 5 of 11

• Monitoring Only. The following parameters will receive a monitor -only requirement since they
did not demonstrate reasonable potential to exceed applicable water quality standards/criteria,
but the maximum predicted concentration was >50% of the allowable concentration: Bis(2-
ethylhexyl)phthalate and cyanide will be monitored quarterly for the emergency outfall
001. Though they didn't exhibit reasonable potential, copper and zinc will be monitored
quarterly based on BPJ due to stream impairments.
• No Limit or Monitoring : The following parameters will not receive a limit or monitoring, since
they did not demonstrate reasonable potential to exceed applicable water quality
standards/criteria and the maximum predicted concentration was <50% of the allowable
concentration: Total phenolic compounds.
• POTW Effluent Pollutant Scan Review: The effluent pollutant data summarized in the renewal
application were evaluated for additional pollutants of concern.
o The following parameter(s) will receive a water quality -based effluent limit (WQBEL)
with monitoring, since as part of a limited data set, two samples exceeded the allowable
discharge concentration: None
o The following parameter(s) will receive a monitor -only requirement, since as part of a
limited data set, one sample exceeded the allowable discharge concentration: None
If applicable, attach a spreadsheet of the RPA results as well as a copy of the Dissolved Metals
Implementation Fact Sheet for freshwater/saltwater to this Fact Sheet. Include a printout of the RPA
Dissolved to Total Metal Calculator sheet if this is a Municipality with a Pretreatment Program.
Toxicity Testing. Limitations
Permit limits and monitoring requirements for Whole Effluent Toxicity (WET) have been established in
accordance with Division guidance (per WET Memo, 8/2/1999). Per WET guidance, all NPDES permits
issued to Major facilities or any facility discharging "complex" wastewater (contains anything other than
domestic waste) will contain appropriate WET limits and monitoring requirements, with several
exceptions. The State has received prior EPA approval to use an Alternative WET Test Procedure in
NPDES permits, using single concentration screening tests, with multiple dilution follow-up upon a test
failure.
Describe proposed toxicity test requirement: Will continue quarterly testing chronic WET limit at
4.6% effluent for 0.9 MGD and will add testing for a chronic Wet limit at 6.0% effluent
concentration for expansion to 1.2 MGD.
Mercury Statewide TMDL Evaluation
There is a statewide TMDL for mercury approved by EPA in 2012. The TMDL target was to comply
with EPA's mercury fish tissue criteria (0.3 mg/kg) for human health protection. The TMDL established a
wasteload allocation for point sources of 37 kg/year (81 lb/year), and is applicable to municipals and
industrial facilities with known mercury discharges. Given the small contribution of mercury from point
sources (^-2% of total load), the TMDL emphasizes mercury minimization plans (MMPs) for point source
control. Municipal facilities > 2 MGD and discharging quantifiable levels of mercury (>1 ng/1) will
receive an MMP requirement. Industrials are evaluated on a case -by -case basis, depending if mercury is a
pollutant of concern. Effluent limits may also be added if annual average effluent concentrations exceed
the WQBEL value (based on the NC WQS of 12 ng/1) and/or if any individual value exceeds a TBEL
value of 47 ng/1
Describe proposed permit actions based on mercury evaluation: The single mercury analysis that was
submitted showed no detect but was not applicable as it did not use test Method 1631E. A special
Page 6 of 11

condition will be added to this permit that will require at a minimum that one effluent mercury
measurement using test method 1631E must be submit in conjunction with the next permit renewal.
If the facility expands prior to the next renewal multiple mercury measurement will be submitted as
part of the required effluent pollutant scans.
Other TMDL/Nutrient Management Stratga Considerations
If applicable, describe any other TMDLs/Nutrient Management Strategies and their implementation
within this permit: NA.
Other W ,BEL Considerations
If applicable, describe any other parameters of concern evaluated for WQBELs: NA
If applicable, describe any special actions (HQW or ORW) this receiving stream and classification shall
comply with in order to protect the designated waterbody: NA
If applicable, describe any compliance schedules proposed for this permit renewal in accordance with
15A NCAC 2H. 010 7( c) (2) (B), 40CFR 122.47, and EPA May 2007Memo: If applicable, describe any
water quality standards variances proposed in accordance with NCGS 143-215.3(e) and 15A NCAC
2B.0226for this permit renewal: NA
7. Technology -Based Effluent Limitations (TBELs)
Municipals
Are concentration limits in the permit at least as stringent as secondary treatment requirements (30 mg/1
BOD5/TSS for Monthly Average, and 45 mgll for BODS/TSS for Weekly Average). YES
If NO, provide a justification for alternative limitations (e.g., waste stabilization pond). NA
Are 85% removal requirements for BOD51TSS included in the permit? YES
If NO, provide a justfcation (e.g., waste stabilization pond). NA
If any limits are based on best professional judgement (BPJ), describe development: NA
Document any TBELs that are more stringent than WQBELs: NA
Document any TBELs that are less stringent than previous permit: NA
8. Antidegradation Review (New/Expanding Discharge):
The objective of an antidegradation review is to ensure that a new or increased pollutant loading will not
degrade water quality. Permitting actions for new or expanding discharges require an antidegradation
review in accordance with 15A NCAC 213.0201. Each applicant for a new/expanding NPDES permit
must document an effort to consider non -discharge alternatives per 15A NCAC 211.0105( c)(2). In all
cases, existing instream water uses and the level of water quality necessary to protect the existing use is
maintained and protected.
Page 7 of 11

If applicable, describe the results of the antidegradation review, including the Engineering Alternatives
Analysis (EAA) and any water quality modeling results:
Based on the projected population growth in the facility's service area demand will exceed the
current 0.9 MGD capacity by 2026. The EAA to evaluate several alternatives as well as expansion
of the existing permitted facility to add 0.3 MGD capacity is summarized below:
Table 3. EAA summary results.
System
Description of Proposed System
Present Worth Cost
Land
Estimated will need 220 acres of land for a lagoon and irrigation area. The
$18.2 million
Application
current treatment works will be upgTaded to meet the additional 0.3 MGD.
Reuse
Estimated the additional treatment, operating cost, and storage required for
$14 million
0.3MGD conjunctive reuse.
Expansion
Estimated the capital upgrades to expand the existing plant
$9.3 mullion
NPDES
Dischar e
The Division concurred with the Permittee that the expansion of the existing facility was the best and
most economical approach.
9. Antibacksliding Review:
Sections 402(o)(2) and 303(d)(4) of the CWA and federal regulations at 40 CFR 122.44(1) prohibit
backsliding of effluent limitations in NPDES permits. These provisions require effluent limitations in a
reissued permit to be as stringent as those in the previous permit, with some exceptions where limitations
may be relaxed (e.g., based on new information, increases in production may warrant less stringent TBEL
limits, or WQBELs may be less stringent based on updated RPA or dilution).
Are any effluent limitations less stringent than previous permit (YES/NO): NO
If YES, confirm that antibacksliding provisions are not violated: NA
10. Monitoring Requirements
Monitoring frequencies for NPDES permitting are established in accordance with the following
regulations and guidance: 1) State Regulation for Surface Water Monitoring, 15A NCAC 2B.0500; 2)
NPDES Guidance, Monitoring Frequency for Toxic Substances (7/15/2010 Memo); 3) NPDES Guidance,
Reduced Monitoring Frequencies for Facilities with Superior Compliance (10/22/2012 Memo); 4) Best
Professional Judgement (BPJ). Per US EPA (Interim Guidance, 1996), monitoring requirements are not
considered effluent limitations under Section 402(o) of the Clean Water Act, and therefore anti -
backsliding prohibitions would not be triggered by reductions in monitoring frequencies.
For instream monitoring, refer to Section 4.
11. Electronic Reporting Requirements
The US EPA NPDES Electronic Reporting Rule was finalized on December 21, 2015. Effective
December 21, 2016, NPDES regulated facilities are required to submit Discharge Monitoring Reports
(DMRs) electronically. Effective December 21, 2020, NPDES regulated facilities will be required to
submit additional NPDES reports electronically. This permit contains the requirements for electronic
reporting, consistent with Federal requirements.
Page 8 of 11

12.Summary of Proposed Permitting Actions:
Table 4. Current Permit Conditions and Proposed Changes 0.9 MGD
Parameter
Current Permit
Proposed Change Basis for Condition/Change
Flow
MA 0.9 MGD
No change 15A NCAC 2B .0505
BODS
Summer:
No change WQBEL. Based on protection of DO
MA 9.0 mg/1
standard. 15A NCAC 2B.0200
WA 13.5 mg/l
Winter:
MA 18.0 mg/1
WA 27.0 mg/l
NH3-N
Summer:
No change WQBEL. Based on protection of
MA 3.0 mg/1
State WQ criteria. 15A NCAC
WA 9.0 mg/l
2B.0200
Winter:
MA 6.0 mg/l
WA 18.0 mg/l
No change TBEL. Secondary treatment
TSS
MA 30.0 mg/1
WA 45.0 mg/1
standards/40 CFR 133 / 15A NCAC
2B .0406
Fecal coliform
MA 200 /100m1
No change WQBEL. State WQ standard, 15A
WA 400 /100ml
NCAC 2B.0200
DO
> 5.0 mg/, daily average
No change WQBEL. State WQ standard, 15A
NCAC 2B.0200
No change WQBEL. State WQ standard, 15A
pH
6.0 - 9.0 SU
NCAC 2B .0200
Total Nitrogen
Monitor Only
No change 15A NCAC 2B .0500 et seq.
Total Phosphorus
Monitor Only
No change 15A NCAC 2B .0500 et seq.-
Conductivity
Monitor 3/week
Remove Not required. The town lacks any
industrial dischargers.
Toxicity Test Chronic limit, 4.6%
No change WQBEL. No toxics in toxic
effluent
amounts. 15A NCAC 2B.0200 and
15A NCAC 2B.0500
Temperature . Monitor Only j
No change WQBEL. 15A NCAC 2B.0200 and
15A NCAC 2B.0500
Total Copper
2/Month Monitoring
Quarterly Monitoring WQBEL. 15A NCAC 2B.0200, no
reasonable potential but receiving
Page 9 of 11

streams are impaired for this
parameter under old standard.
Total Zinc
Quarterly Monitoring
Quarterly Monitoring
WQBEL. 15A NCAC 2B.0200, no
reasonable potential but receiving
streams are impaired for this
parameter under old standard.
Cyanide
No requirement
Quarterly monitoring
WQBEL. 15A NCAC 2B.0200 and
reasonable potential to violate WQS
Quarterly Monitoring
at emergency outfall 001
Bis(2-ethylhexyl)
No requirement
WQBEL. EPA NRWQC and
reasonable potential to violate WQS
phthalate
at the emergency outfall 001 at
0.9MGD
Mercury
Different requirement Add special condition
15A NCAC 2B .0500 et seq.
Electronic No requirement Add Electronic In accordance with EPA Electronic
Reporting Reporting Special Reporting Rule 2015.
Condition
MGD — Million gallons per day, MA - Monthly Average, WA — Weekly Average, DM — Daily Max
Table 5. Proposed New Conditions for expansion 1.2 MGD
Parameter Expansion Permit
Proposed Condition
Basis for Condition
Flow MA 1.2 MGD
15A NCAC 2B .0400 et seq., 02B
New
.0500 yet seq.
BODS Year round:
New
WQBEL. Based on protection of DO
MA 10.0 mg/l
standard. 15A NCAC 2B.0200,
WA 15.0 mg/l
limit based on QUAL2E Model
NH3-N Year round:
New
WQBEL. Based on protection of
MA 4.0 mg/l
State WQ criteria. 15A NCAC
WA 12.0 mg/l
2B.0200, limit based on QUAL2E
Model
DO > 6 mg/l, daily average
New
WQBEL. State WQ standard, 15A
NCAC 2B .0200, limit based on
QUAL2E Model
Toxicity Test
Chronic limit, 6.0%
New
15A NCAC 2B .0200 et seq., limit
effluent
based on IWC%
Effluent Pollutant I Provide 3 seasonal scans New 40 CFR 122, G.S. 143.215(b)
Scan/2' Species and 4 seasonal 2'
Tests species test
MGD — Million gallons per day, MA - Monthly Average, WA — Weekly Average, DM — Daily Max
Page 10 of 11

13. Public Notice Schedule:
Permit to Public Notice: 05/02/2018
Per 15A NCAC 2H .0109 & .0111, The Division will receive comments for a period of 30 days
following the publication date of the public notice. Any request for a public hearing shall be
submitted to the Director within the 30 days comment period indicating the interest of the party
Ming such request and the reasons why a hearing is warranted.
14. Fact Sheet Addendum (if applicable):
Were there any changes made since the Draft Permit was public noticed (Yes/No): NO
If Yes, list changes and their basis below: NA
15. Fact Sheet Attachments (if applicable):
RPA Spreadsheet Summary
Dissolved Metals Implementation/Freshwater or Saltwater
Page 11 of 11

Permit No.N00043532
NPDES Implementation of Instream Dissolved Metals Standards - Freshwater Standards
The NC 2007-2015 Water Quality Standard (WQS) Triennial Review was approved by the NC
Environmental Management Commission (EMC) on November 13, 2014. The US EPA subsequently
approved the WQS revisions on April 6, 2016, with some exceptions. Therefore, metal limits in draft
permits out to public notice after April 6, 2016 must be calculated to protect the new standards - as
approved.
Table 1. NC Dissolved Metals Water afitv Standards/Aquatic Life Protection
Parameter
Acute FW, µg/1
(Dissolved)
Chronic FW, µg/l
(Dissolved)
Acute SW, µg/l
(Dissolved)
Chronic SW, µg/l
(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 standard
3. Only the aquatic life standards listed above are expressed in dissolved form. Aquatic life
standards for Mercury and selenium are still expressed as Total Recoverable Metals due to
bioaccumulative concerns (as are all human health standards for all metals). It is still necessary
to evaluate total recoverable aquatic life and human health standards listed in 15A NCAC
213.0200 (e.g., arsenic at 10 µg/l for human health protection; cyanide at 5 µg/L and fluoride at
1.8 mg/L for aquatic life protection).
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, µg/I
Cadmium, Acute
WER*{1.136672-[In hardness](0.041838)} • e^{0.9151 [In hardness]-3.1485}
Cadmium, Acute Trout waters
WER*{1.136672-[In hardness](0.041838)} • e^{0.915I[1n hardness]-3.6236}
Cadmium, Chronic
WER*{1.101672-[In hardness] (0.041838)} • e^{0.7998[ln hardness]-4.4451}
Chromium III, Acute
WER*0.316 e^{0.8190[In hardness]+3.7256}
Chromium Ill, Chronic
WER*0.860 a^{0.8190[ln hardness]+0.6848}
Copper, Acute
WER*0.960 e^{0.9422[ln hardness]-1.700}
Copper, Chronic
WER*0.960 e^{0.8545[ln hardness]-1.702}
Lead, Acute
WER*{1.46203-[In hardness](0.145712)} • e^{1.273[ln hardness]-1.460}
Lead, Chronic
WER*{1.46203-[In hardness](0.145712)) • e^{1.273[ln hardness]-4.705)
Nickel, Acute
WER*0.998 e^{0.8460[ln hardness]+2.255}
Nickel, Chronic
WER*0.997 a^{0.8460[ln hardness]+0.0584)
Page 1 of 4

Permit No.N00043532
Silver, Acute
WER*0.85 • e^{1.72[ln hardness]-6.59)
Silver, Chronic
Not applicable
Zinc, Acute
WER*0.978 a^{0.8473[ln hardness]+0.884)
Zinc, Chronic
WER*0.986 e^{0.8473[ln hardness]+0.884)
General Information on the Reasonable Potential Analysis WA]
The RPA process itself did not change as the result of the new metals standards. However, application of
the dissolved and hardness -dependent standards requires additional consideration in order to establish the
numeric standard for each metal of concern of each individual discharge.
The hardness -based standards require some knowledge of the effluent and instream (upstream) hardness
and so must be calculated case -by -case for each discharge.
Metals limits must be expressed as `total recoverable' metals in accordance with 40 CFR 122.45(c). The
discharge -specific standards must be converted to the equivalent total values for use in the RPA
calculations. We will generally rely on default translator values developed for each metal (more on that
below), but it is also possible to consider case -specific translators developed in accordance with
established methodology.
RPA Permitting Guidance/WOBELs for Hardness -Dependent Metals - Freshwater
The RPA is designed to predict the maximum likely effluent concentrations for each metal of concern,
based on recent effluent data, and calculate the allowable effluent concentrations, based on applicable
standards and the critical low -flow values for the receiving stream.
If the maximum predicted value is greater than the maximum allowed value (chronic or acute), the
discharge has reasonable potential to exceed the standard, which warrants a permit limit in most cases. 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.
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 1 Q 10 using the formula 1 Q 10 = 0.843 (s7Q 10, cfs) 0.993
• Effluent hardness and upstream hardness, site -specific data is preferred
• Permitted flow
• Receiving stream classification
2. In order to establish the numeric standard for each hardness -dependent metal of concern and for
each individual discharge, the Permit Writer must first determine what effluent and instream
(upstream) hardness values to use in the equations.
The permit writer reviews DMR's, Effluent Pollutant Scans, and Toxicity Test results for any
hardness data and contacts 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 (CaCO3 or (Ca + Mg)). Minimum and maximum limits on the
hardness value used for water quality calculations are 25 mg/L and 400 mg/L, respectively.
If the use of a default hardness value results in a hardness -dependent metal showing reasonable
potential, the permit writer contacts the Permittee and requests 5 site -specific effluent and
upstream hardness samples over a period of one week. The RPA is rerun using the new data.
Page 2 of 4

Permit No.N00043532
The overall hardness value used in the water quality calculations is calculated as follows:
Combined Hardness (chronic)
= Permitted Flow, cfs *Avg. Effluent Hardness mg/L) + (s70 10 cfs *Avp,. Upstream Hardness mg/L
(Permitted Flow, cfs + s7Q 10, cfs)
The Combined Hardness for acute is the same but the calculation uses the 1 Q 10 flow.
3. The permit writer converts the numeric standard for each metal of concern to a total recoverable
metal, using the EPA Default Partition Coefficients (DPCs) or site -specific translators, if any
have been developed using federally approved methodology.
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
Ctotal 1 + i [KPo] [ss(i+a)] [10`11
Where:
ss = in -stream suspended solids concentration [mg/1], minimum of 10 mg/L used,
and
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.
4. The numeric standard for each metal of concern is divided by the default partition coefficient (or
site -specific translator) to obtain a Total Recoverable Metal at ambient conditions.
In some cases, where an EPA default partition coefficient translator does not exist (ie. silver), the
dissolved numeric standard for each metal of concern is divided by the EPA conversion factor to
obtain a Total Recoverable Metal at ambient conditions. This method presumes that the metal is
dissolved to the same extent as it was during EPA's criteria development for metals. For more
information on conversion factors see the June, 1996 EPA Translator Guidance Document.
5. The RPA spreadsheet uses a mass balance equation to determine the total allowable concentration
(permit limits) for each pollutant using the following equation:
Ca = WO 10 + Ow) (Cwgs)-(s7Q10) (Cb)
Qw
Where: Ca = allowable effluent concentration (µg/L or mg/L)
Cwqs = NC Water Quality Standard or federal criteria (µg/L or mg/L)
Cb = background concentration: assume zero for all toxicants except NH3* (µg/L or mg/L)
Qw = permitted effluent flow (cfs, match s7Q 10)
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 (cfs)
* 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
Page 3 of 4

Permit No.N00043532
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 permit writer enters the most recent 2-3 years of effluent data for each pollutant of concern.
Data entered must have been taken within four and one-half years prior to the date of the permit
application (40 CFR 122.21). The RPA spreadsheet estimates the 95th percentile upper
concentration of each pollutant. The Predicted Max concentrations are compared to the Total
allowable concentrations to determine if a permit limit is necessary. If the predicted max exceeds
the acute or chronic Total allowable concentrations, the discharge is considered to show
reasonable potential to violate the water quality standard, and a permit limit (Total allowable
concentration) is included in the permit in accordance with the U.S. EPA Technical Support
Document for Water Quality -Based Toxics Control published in 1991.
7. When appropriate, permit writers develop facility specific compliance schedules in accordance
with the EPA Headquarters Memo dated May 10, 2007 from James Hanlon to Alexis Strauss on
40 CFR 122.47 Compliance Schedule Requirements.
The Total Chromium NC WQS was removed and replaced with trivalent chromium and
hexavalent chromium Water Quality Standards. As a cost savings measure, total chromium data
results may be used as a conservative surrogate in cases where there are no analytical results
based on chromium III or VI. In these cases, the projected maximum concentration (95th %) for
total chromium will be compared against water quality standards for chromium III and
chromium VI.
9. Effluent hardness sampling and instream hardness sampling, upstream of the discharge, are
inserted into all permits with facilities monitoring for hardness -dependent metals to ensure the
accuracy of the permit limits and 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 (Data Source)
..................
Average Effluent Hardness (mg/L)
[Total as, CaCO3 or (Ca+Mg)]
156.8
Nov. 2017 Sampling
Average Upstream Hardness (mg/L)
[Total as, CaCO3 or (Ca+Mg)]
56.8/85.6
Nov. 2017 Sampling
USGS
7Q10 summer (cfs)
3.3/29
1Q10 (cfs)
2.8/23.9
Calculated
Permitted Flow (MGD)
0.9/1.2
1.2 expanded flow
Date: 4/3/18
Permit Writer: David Hill
Page 4 of 4

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NH3/TRC WLA Calculations
Facility: W. Stanly WWTP
PermitNo. NCO043532
Prepared By: David Hill
Enter Design Flow (MGD): 0.9
Enter s7Q10 (cfs): 3.3
Enter w7Q10 (cfs): 5.8
Total Residual Chlorine (TRC)
Daily Maximum Limit (ug/1)
Ammonia (Summer)
Monthly Average Limit (mg NH3-N/1)
s7Q10 (CFS)
3.3
s7Q10 (CFS)
3.3
DESIGN FLOW (MGD)
0.9
DESIGN FLOW (MGD)
0.9
DESIGN FLOW (CFS)
1.395
DESIGN FLOW (CFS)
1.395
STREAM STD (UG/L)
17.0
STREAM STD (MG/L)
1.0
Upstream Bkgd (ug/1)
0
Upstream Bkgd (mg/1)
0.22
IWC (%)
29.71
IWC (%)
29.71
Allowable Conc. (ug/1)
57
Allowable Conc. (mg/1)
2.8
Ammonia (Winter)
Monthly Average Limit (mg NH3-N/1)
Fecal Coliform
w7Q10 (CFS)
5.8
Monthly Average Limit:
2001100m1 DESIGN FLOW (MGD)
0.9
(If DF >331; Monitor)
DESIGN FLOW (CFS)
1.395
(If DF<331; Limit)
STREAM STD (MG/L)
1.8
Dilution Factor (DF)
3.37 Upstream Bkgd (mg/1)
0.22
IWC (%)
19.39
Allowable Conc. (mg/1)
8.4
Total Residual Chlorine
1. Cap Daily Max limit at 28 ug/I to protect for acute toxicity
Ammonia (as NH3-N�
1. If Allowable Conc > 35 mg/I, Monitor Only
2. Monthly Avg limit x 3 = Weekly Avg limit (Municipals); capped at 35 mg/I
3. Monthly Avg limit x 5 = Daily Max limit (Non-Munis); capped at 35 mg/I
Fecal Coliform
1. Monthly Avg limit x 2 = 400/100 ml = Weekly Avg limit (Municipals) = Daily Max limit (Non -Muni)

NH3/TRC WLA Calculations
Facility: W. Stanly WWTP
PermitNo. NCO043532
Prepared By: David Hill
Enter Design Flow (MGD): 1.2
Enter s7Q10 (cfs): 29
Enter w7Q10 (cfs): 51
Total Residual Chlorine (TRC)
Ammonia (Summer)
Daily Maximum Limit (ug/1)
Monthly Average Limit (mg NH3-N/I)
s7Q10 (CFS)
29
s7Q10 (CFS)
29
DESIGN FLOW (MGD)
1.2
DESIGN FLOW (MGD)
1.2
DESIGN FLOW (CFS)
1.86
DESIGN FLOW (CFS)
1.86
STREAM STD (UG/L)
17.0
STREAM STD (MG/L)
1.0
Upstream Bkgd (ug/1)
0
Upstream Bkgd (mg/1)
0.22
IWC (%)
6.03
IWC (%)
6.03
Allowable Conc. (ug/1)
282
Allowable Conc. (mg/1)
13.2
3 0
►�- �-.
Ammonia (Winter)
Monthly Average Limit (mg NH3-N/1)
Fecal Coliform
w7Q10 (CFS)
51
Monthly Average Limit:
2001100ml
DESIGN FLOW (MGD)
1.2
(If DF >331; Monitor)
DESIGN FLOW (CFS)
1.86
(If DF<331; Limit)
STREAM STD (MG/L)
1.8
Dilution Factor (DF)
16.59
Upstream Bkgd (mg/1)
0.22
Z► _-49
IWC (%)
3.52
Allowable Conc. (mg/1)
45.1
S°I .fin
Total Residual Chlorine
1. Cap Daily Max limit at 28 ug/l to protect for acute toxicity
Ammonia (as NH3-N]
1. If Allowable Conc > 35 mg/I, Monitor Only
2. Monthly Avg limit x 3 = Weekly Avg limit (Municipals); capped at 35 mg/I
3. Monthly Avg limit x 5 = Daily Max limit (Non-Munis); capped at 35 mg/I
Fecal Coliform
1. Monthly Avg limit x 2 = 400/100 ml = Weekly Avg limit (Municipals) = Daily Max limit (Non -Muni)

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Krlr.--p
Final 2016 Category 5 Assessments-303(d) List
Fn 4a�td Rocky River Subbasin Yadkin -Pee Dee River Basin
Assessment Unit Name Assessment Unit Description
Assessment Unit Number Water Quality Classification Length/Area Units
Rocky River From Reedy Creek to Irish Buffalo Creek
13-17b3 C 3.2 FW Miles
Assessment Criteria Status Reason for Rating Parameter of Interest IR Category
Exceeding Criteria > 10% and >90 conf Turbidity (50 NTU, AL, FW miles) 5
Exceeding Criteria Fair Benthos (Nar, AL, FW) 5
Rocky River From the Irish Buffalo Creek to Hamby Branch
13-17c1
Assessment Criteria Status Reason for Rating
Exceeding Criteria > 10% and >90 conf
Exceeding Criteria > 10% and >90 conf
Exceeding Criteria Fair
I
Parameter of Interest
Turbidity (50 NTU, AL, FW miles)
Copper (7 jig/I, AL, FW)
Benthos (Nar, AL, FW)
2.8 FW Miles
IR Category
5
5
5
Rocky River From Hamby Branch to Anderson Creek
13-17c2 C 5.9 FW Miles
Assessment Criteria Status Reason for Rating Parameter of Interest IR Category
Exceeding Criteria > 10% and < 90% conf Copper (7 µg/I, AL, FW) 5e
Exceeding Criteria > 10% and >90 conf Turbidity (50 NTU, AL, FW miles) 5
Rocky River From Anderson Creek to Lanes Creek
13-17c3
Assessment Criteria Status
Exceeding Criteria
Exceeding Criteria
Exceeding Criteria
Reason for Rating
> 10% and < 90% conf
> 10% and < 90% conf
> 10% and >90 conf
C
34.9 FW Miles
Parameter of Interest IR Category
Copper (7 µg/I, AL, FW) 5e
Zinc (50 µg/I, AL, FW) 5e
Turbidity (50 NTU, AL, FW miles) 5
Rocky River From the Lanes Creek to the Pee Dee River
13-17d C 11.5 FW Miles
Assessment Criteria Status Reason for Rating Parameter of Interest IR Category
Exceeding Criteria < 10% Copper (7 µg/I, AL, FW) 5e
Exceeding Criteria > 10% and >90 conf Turbidity (50 NTU, AL, FW miles) 5
3/23/2018 Final 2016 NC Category 5 Assessments Page 194 of 196

K`ra Final 2016 Category 5 Assessments-303(d) List
fn � rat Rocky River Subbasin Yadkin -Pee Dee River Basin
Assessment Unit Name Assessment Unit Description
Assessment Unit Number Water Quality Classification Length/Area Units
Irish Buffalo Creek From Kannapolis Water Supply Dam to Rocky River
13-17-9-(2)
C
16.7 FW Miles
Assessment Criteria Status
Reason for Rating Parameter of Interest
IR Category
Exceeding Criteria
> 10% and < 90% conf Copper (7 µg/l, AL, FW)
Se I
Lanes Creek
From source to Marshville Water Supply Dam (located 0.1 mile
downstream of Beaverdam Creek)
13-17-40-(1)
WS-v
27.4 FW Miles
ssessment Criteria Status
Reason for Rating Parameter of Interest
IR Category
Exceeding Criteria
Fair Benthos (Nar, AL, FW)
5
Lanes Creek
From Marshville Water Supply Dam (located 0.1 mile downstream of
Beaverdam Creek) to Rocky River
13-17-40-(12)
C
27.1 FW Miles
Assessment Criteria Status
Reason for Rating Parameter of Interest
IR Category
Exceeding Criteria
Benthos (Nar, AL, FW)
5
Little Richardson Creek (Lake Mon From source to a point 0.6 mile upstream of Buck Branch
13-17-36-4-(0.5)
WS-Iv
77.1 FW Acres
ssessment Criteria Status
Reason for Rating Parameter of Interest
IR Category
Data Inconclusive
> 10% and >90 conf N<10 Chlorophyll a (40 jig/I, AL, NC)
5
Little Richardson Creek (Lake Monr From a point 0.6 mile upstream of Buck Creek to Richardson Creek
13-17-36-4-(2)
WS-IV;CA
38.7 FW Acres
Assessment Criteria Status
Reason for Rating Parameter of Interest
IR Category
Data Inconclusive
> 10% and >90 conf N<10 Chlorophyll a (40 µg/l, AL, NC)
5
Long Creek
From Little Long Creek to Rocky River
13-17-31b
C
2.2 FW Miles
Assessment Criteria Status
Reason for Rating Parameter of Interest
IR Category
Exceeding Criteria
> 10% and >90 conf Copper (7 µg/I, AL, FW)
5
3/23/2018 Final 2016 NC Category 5 Assessments Page 191 of 196

Berry, Ron
From: Behm, Pamela
Sent: Tuesday, February 27, 2018 1:54 PM
To: Berry, Ron
Subject: RE: Assistance with NPDES renewal & expansion in Rocky River - Yadkin -Pee Dee River
Hi Ron,
There is no new data for these 2 segments, and both are still considered impaired. There has been new dissolved
copper data collected on the segment immediately below 13-176 (13-17d) on the Rocky that confirms the impairment
for copper for segment 13-17d, this will be reflected on the 2018 303(d) list. With Long Creek as category 5 and not 5e
for copper and zinc, we know that the impairment was confirmed when applying the new statistical methodology (we do
10% exceedance with 90% statistical confidence for 303(d) listing since 2014). When you see category 5e, that shows
the impairment was not confirmed with the new statistical methodology, but EPA did not allow NC to delist until new
dissolved data is collected and status verified.
Hope this helps,
Pam
From: Berry, Ron
Sent: Tuesday, February 27, 2018 11:26 AM
To: Behm, Pamela <[e-mail]>
Subject: Assistance with NPDES renewal & expansion in Rocky River - Yadkin -Pee Dee River
Pam,
We are currently developing a NPDES renewal and modification permit for West Stanly WWTP NC0043532. The facility
discharges to Rocky River AU 13-176 and has an emergency outfall that discharges to Long Creek AU 13-17-31b. Both
stream locations are listed on the 2014 303d list since 2008. Rocky River has an IR Category 5e for Copper and Zinc and
Long Creek as a IR Category 5 for copper and zinc. Not sure if data is being collected to change the rating or if the data
collected previously meets our current water quality standard criteria. Need to determine how to apply 303d listing for
applying copper and zinc water quality standards. Any thoughts or additional information you can provide?
Thanks, Ron
Ron Berry
Engineer
Division of Water Resources/Complex Permitting
North Carolina Department of Environmental Quality
919 807 6396 office
ron.berrvO-ncdenr.gov
512 N. Salisbury Street
1617 Mail Service Center
Raleigh, NC 27699-1617
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.

EXPANSION West Stanly WWTP (formerly Oakboro WWTP) NC0043532
Received NPDES permit modification application from Town of Oakboro to expand existing facility from 0.9
MGD to 1.2 MGD (0.3 MGD increase) on July 2013. Ownership changed and NPDES permit re -issued to
Stanly County in March 2014. Stanly County has requested the previous expansion application to 1.2 MGD be
included in the current renewal process.
Flow Justification:
Consultant used historical growth in region for primary towns connected to WWTP, 1980 to present, to
determine population growth rate. Portion of service area (western part of county) is considered a potential
suburb of the Charlotte area. Projected annual increase in domestic wastewater by applying the historical
population growth rate and using per capita residential flow factor 70 gpm and commercial factor of 15 gpm.
Projected exceedance of 80% of 0.9 MGD in 2013 with predicted flow to reach 0.97 MGD by 2032. Annual
flow increase about 0.010 MGD per year.
Note: Checked DMR data in 2013 the highest monthly average flow reported was 0.682 MGD, so far in 2014
highest reported monthly average flow is 0.678 MGD.
EAA REVIEW
1) Connect to a regional or other existing WWTP — Stanly is the regional WWTP and should be expanded.
No other system connection warranted.
2) Land Application — Irrigation of 0.3 MGD
- 18 MG storage lagoon
- Purchase 220 acres
- 1,200 land application pump station
- Piping and irrigation system
- Plant current limits more stringent than 2T rules, capable to continue to meet 2T rules at
higher flows
3) Wastewater Reuse — Reuse 0.3 MGD
- New filters at WWTP to meet 2U rules
- 1.5 MG detention pond
- 9 MG storage basin
- 1,200 reclaimed water pump station
- 0.2 MG elevated storage tank
4) Re-rate/upgrade West Stanly WWTP — expand to 1.2 MGD apply limits as listed in 2005 spec letter for
1.2 MGD
- Existing plant basic design was for 1.2 MGD, minor changes
- New surface aerators
- New 0.18 MG Sludge Holding Tank
- New polymer feed system
COST COMPARISON
Application
Wastewater
Reuse
Expand existing
WWTP
Project Cost
JL7and
8,783,000
$4,064,000
$811,000
Annual O&M
$576,000
$606,000
1 $5210,000
Present Worth
$9,409,343
$9,899,413
$8,494,546
Total Present Worth
$18,192,353
$13,963,413
$9,305,546
Re -rate/ upgrade existing Stanly WWTP best option
s'�d_t 60w�
0 u 2_

Date:12/16/15
EXISTING ROCKY RIVER LIMITS - 0.9 MGD
1) BOD (monthly avg limit)
Summer 9.0 mg/I x
0.9 MGD x
8.34
Winter 18.0 mg/I x
0.9 MGD x
8.34
Annual
2) NH3-N (monthly avg limit)
Summer 3.0 mg/I x
0.9 MGD x
8.34
Toxicity 17.2 mg/I
limit more stringent than toxicity
Winter 6.0 mg/I x
0.9 MGD x
8.34
Toxicity > 35.0 mg/I
limit more stringent than toxicity
Annual
3) DO (daily avg minimum limit)
Annual 5.0 mg/I x
0.9 MGD x
8.34
WQS 5.0 mg/I
limit = WQS
PROPOSED EXPANSION ROCKY RIVER LIMITS -1.2 MGD
1) BOD (monthly avg limit)
Annual 10.0 mg/I x
1.2 MGD x
8.34
2) NH3-N (monthly avg limit)
Ibs-I/MG-mg x 213 days 14,389 Ibs-Summer
Ibs-I/MG-mg x 152 days 20,536 Ibs-Winter
34,925 Ibs/y r
Ibs-I/MG-mg x 213
Ibs-I/MG-mg x 152
Ibs-I/MG-mg x 365
Ibs-I/MG-mg x 365
Annual 4.0 mg/I x 1.2
MGD x 8.34 Ibs-I/MG-mg x
365
Summer Toxicity 13.2 mg/I
limit more stringent than toxicity
Winter Toxicity > 35.0 mg/I
limit more stringent than toxicity
3) DO (daily avg minimum limit)
Annual 6.0 mg/I x 1.2
MGD x 8.34 Ibs-I/MG-mg x
365
WQS 5.0 mg/I limit more
stringent than WQS
SUMMARY
Summer
% increase flow expansion 33.33%
Annual
mg/I
Ibs r
inc dec
1) BOD % increase for expansion
4.59%
11.11 %
2) NH3-N % increase for expansion
25.51%
33.33 %
3) DO % increase for expansion
60.00%
20.00 %
Ratio of DO increase to (BOD + NH3-N) increase = 1.99
days 4,796 Ibs-Summer
days 6,845 Ibs-Winter
11,642 Ibs/yr
days 13,698 Ibs/yr
days 36,529 Ibs/yr
days 14,612 Ibs/yr
days 21,918 Ibs/yr
Winter
mg/I
inc dec
(44.44) %
(33.33) %
20.00 %

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Date: 6/14/17
pb:rdb
DMR Data for NPDES Permit NCO043532
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Date: 6/14/17 DMR Data for NPDES Permit NCO043532
pb:rdb West Stanly WWTP
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On Tue, Feb 6, 2018 at 3:36 PM, Berry, Ron <ron.berry ncdenr.gov> wrote:
Ms. Davis,
As a matter of record to comply with federal and state regulations on NPDES application on a five year cycle , the
Division needs confirmation from the Permittee that:
1. You are still requesting renewal of your active NPDES permitted flow of 0.9 MGD
2. You are still requesting a NPDES permit modification to expand to 1.2 MGD
3. There has been no change in the operation of the current facility, sources of wastewater (activation of
pretreatment program or acceptance of non -domestic wastewater) since submittal of the 2013 NPDES permit
renewal and modification application.
A confirmation response to this email is acceptable and will be attached to the 2013 application to show the application
has been updated. At this time no additional information is required. After the NPDES permit is issued with a limitation
page for expansion to 1.2 MGD, for West Stanly to expand will require Authorization to Construct approval through a
separate application process. If you have any questions let me know.
Ron Berry
Engineer
Division of Water Resources/Complex Permitting
North Carolina Department of Environmental Quality
919 807 6396 office
ron.berry(a0cdenr.gov
512 N. Salisbury Street
1617 Mail Service Center
Raleigh, NC 27699-1617
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.

Berry, Ron
From: Donna Davis <[e-mail]>
Sent: ,Tuesday, February 06, 2018 4:00 PM
To: Berry, Ron
Subject: [External] Re: Updated required fro NPDES renewal and modification application
�Xf7rn:T em.311 Do not dirk link; or open aItarhrrif,W5 tartlt`s, veriIloci. 5f'r3d ) l su5PsOOU , Prric3iI 3s ar3 aIla( hment to
Mr. Berry,
This email is to confirm that:
1. Stanly County is still requesting renewal of your active NPDES permitted flow of 0.9 MGD for the West Stanly
W WTP.
2. Stanly County is still requesting a NPDES permit modification to expand to 1.2 MGD for the West Stanly WWTP.
3. There has been no change in the operation of the current facility, sources of wastewater (activation of
pretreatment program or acceptance of non -domestic wastewater) since submittal of the 2013 NPDES permit
renewal and modification application.
Thank you for your assistance with this process.
Donna Davis
Stanly County Utilities
1000 N 1st Street
Suite 12
Albemarle, NC 28001
[phone]
1

Berry, Ron
From: Behm, Pamela
Sent: Monday, July 17, 2017 12:22 PM
To: Berry, Ron
Subject: RE: Question on Impairment
Hi Ron,
What we've been telling everyone is that we have to use the most current approved 303(d) list, which in this case is
2014. EPA disagrees with delisting these specific waters in 2016 and they will likely be put back on the final 2016 303(d)
list. I'm not exactly sure what you mean by AL no longer applies, we don't have any data for these segments to compare
to the new dissolved metals standards, so we have to work under the assumption that they are still impaired.
Hope this helps.
Pam
From: Berry, Ron
Sent: Monday, July 17, 2017 11:59 AM
To: Behm, Pamela <[e-mail]>
Subject: Question on Impairment
Pam,
I am working on a NPDES permit renewal and expansion for West Stanly WWTP (formerly Oakboro WWTP). The facility's
primary permitted discharge is to Rocky River AU#13-17c3 (Yadkin -Pee Dee River Basin). The current permit also has an
emergency discharge to Long Creek AU#13-17-31b (Yadkin -Pee Dee River Basin. The Rocky River segment was impaired
for Copper and Zinc in 2008 and Long Creek for Copper in 2008. Both segment are still listed as impaired on the 2014
303d list but in the pending 2016 303d list Rocky River delisted Copper and Zinc impairments (see below) and turbidity
was added.
Rocky RIVED From Anderson Creek to Lanes Creek
13-17C3 C 34.9 FW Miles
New IRC 2014 Category 5 Parameter Justification for removing assessment from the 2016 303(d)
3a Previous listing in Category 5 was inconsistent with the assessment
methodology. Available data insufficient to determine attainment
status
Copper (7 µg/I, AL, FW)
3a Previous listing in Category 5 was inconsistent with the assessment
methodology. Available data insufficient to determine attainment
status
Zinc (50 µg/I, AL, FW)
For Long Creek segment the copper impiarmnet remained in the 2016 303d assestment..
Not sure how to inturpret the receiving stream impairment for this NPDES permit. AL no longer applies and both the
copper and zinc current have new WQS criteria.
Your input would be appreciated.

Ron Berry
Engineer
Division of Water Resources/Complex Permitting
North Carolina Department of Environmental Quality
919 807 6396 office
ron.berrv(a)ncdenr.00v
512 N. Salisbury Street
1617 Mail Service Center
Raleigh, NC 27699-1617
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.

2-
Iff @P 5' L
WEST STANLY WWTP
MR. DON ZUFALL
STANLY COUNTY UTILITIES
1000 H. FIRST ST., SUITE 12
ALBENARLE NC 28001
PARAMETERS
Total Hardness, rag/1
tt �(,?@ 0,
Effluent Upstream Upstream
001 002
XD#: 840 H
DATE COLLECTBDt 11/14/17
DATE REPORTED c 11/27/17
REVIEWED BY:
Analysis Method
Date Analyst Code
144 56 84 11120/17 KDS 234OC-11

Imuma
�x
P..(3. BC3X 7C�85 4 �A MOiN -DRIV
r... A."
0 d
ID#: 840 H
WEST STANLY WWTP
MR. DON ZUFALL
STANLY COUNTY UTILITIES DATE COLLECTBDs 11/15/17
1000 N. FIRST ST., SUITE 12 DATE REPORTED : 11/27/17
ALBEMARLE ,NC 28001
REVIEWED BYs
Effluent Upstream Upstream Analysis Method
PARA114ETERS 001 002 Date Analyst Code
Total Hardness, mg/1 140 60 88 11/20/17 KDS 2340C-11

i
r '
raWD'ummEq % hi'mo FPO un, Nd
WEST STANLY WWTP
M. DON ZUFALL
STANLY COUNTY UTILITIES
1000 N. FIRST ST., SUITE 12
ALSEMARLE ,NC 28001
PARAMETERS
Total Hardness, mgA
TD#: 840 H
DATE COLLECTED: 11/07/17
DATE REPORTED s 11/16/17
REVIEWED BY:
Effluent Upstream Upstream Analysis Method
001 002 Date Analyst Code
164 56 84 11/13/17 KDS 2340C-11

a
ErunhRESM % kwum. N
WEST STANLY WWTP
MR. DON ZUFALL
STANLY COUNTY UTILITIES
1000 N. FIRST ST., SUITE 12
ALBEMARLE ,NC 28001
PARAMETERS
ID#: 840 H
DATE COLLECTED: 11/08/17
DATE REPORTED : 11/16/17
REVIEWED BYs
Effluent Upstream Upstream Analysis McWod
001 002 Date Analyst Code
Total Hardness, mg/l 168 56 84 11/13/17 KDS 2340C-11

ado
ID#c 840 H
NEST STANLY WWTP
MR. DON ZUFALL
STANLY COUNTY UTILITIES DATE COLLECTED: 11/09/17
1000 N. FIRST ST., SUITE 12 DATE REPORTED : 11/16/17
ALBEMARLE ,NC 28001
REVIEWED BY: A
f ,
Effluent Upstream Upstream Analysis Method
PARAI4IETERS 001 002 Date Analyst Code
Total Hardness, n:g/l 168 56 88 11/13/17 KDS 2340C-11