NC0030970_Fact Sheet_20230711

Fact Sheet
NPDES Permit No. NCO030970
Permit Writer/Email Contact Nick Coco,[e-mail]:
Date: July 6,2023
Division/Branch:NC Division of Water Resources/NPDES Municipal Permitting
Fact Sheet Template: Version 09Jan2017
Permitting Action:
❑X 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 2nd 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: Town of Spring Lake/Town of Spring Lake Wastewater Treatment
Plant(WWTP)
Applicant Address: 350 Harps Street, Spring Lake,NC 28390
Facility Address: 350 Harps Street, Spring Lake,NC 28390
Permitted Flow: 1.5 MGD
Facility Type/Waste: MAJOR Municipal; 100%domestic
Facility Class: Grade III Biological Water Pollution Control System
Treatment Units: Influent screw pumps,Mechanical grit removal,Mechanical bar screen,
Dual aeration basins, Three clarifiers,Dual post aeration basins,Dual
chlorine contact basins, Dechlorination, Sludge decanting tanks,Lime
sludge stabilization,Dual sludge stabilization tanks, Sludge holding
tank
Pretreatment Program(Y/N) N
County: Cumberland
Region Fayetteville
Briefly describe the proposed permitting action and facility background: The Town of Spring Lake has
applied for an NPDES permit renewal at 1.5 MGD for the Spring Lake WWTP. This facility serves a
population of approximately 10,300 residents. Treated domestic wastewater is discharged into the Little
River, a class C waterbody in the Cape Fear River Basin. Outfall 001 is approximately 20 miles upstream
of waters designated as WS-V.
Sludge disposal: Sludge is land applied via permit WQ0001086.
Page 1 of 9

2. Receiving Waterbody Information:
Receiving Waterbody Information
Outfalls/Receiving Stream(s): Outfall 001 -Little River
Stream Segment: 18-23-(24)
Stream Classification: C
Drainage Area(mi2): 356.8
Summer 7Q10(cfs) 40
Winter 7Q10(cfs): 83
30Q2 (cfs): -
Average Flow(cfs): 444
IWC (%effluent): 5.5
2022 303(d) listed/parameter: Not listed
Subject to TMDL/parameter: Yes- State wide Mercury TMDL implementation.
Basin/HUC: Cape Fear River/HUC: 03030004
USGS Topo Quad: G23NW
3. Effluent Data Summary
Effluent data for Outfall 001 is summarized below for the period of August 2018 through October 2022.
Table 1. Effluent Data Summary Outfall 001
Parameter Units Average Max Min Permit Limit
Flow MGD 1.0 2.618 0.03 MA 1.5
BOD summer mg/l 6.4 53 2.4 WA 42.0
MA 28.0
BOD winter mg/1 6.7 40.7 0.03 WA 45.0
MA 30.0
NH3N summer mg/l 2.2 17.5 0.1 WA 24.0
MA 8.0
NH3N winter mg/l 2.2 14.7 0.1 M/R
TSS mg/l 9.2 136 1.8 WA 45.0
MA 30.0
pH SU 6.7 7.98 6 6.0>pH<9.0
(geometric)
Fecal coliform #/100 ml (ge 5 2 an) 6000 1 WA 400
MA 200
DO summer mg/l 7.2 9.13 6.01 DA>5.0
DO winter mg/1 8.3 10.44 6.45 M/R
TRC µg/l 22.2 746 10 DM 28.0 (<
50 compliance)
Temperature ° C 20.0 29.3 11.8 M/R
TN mg/1 5.3 48.5 0.576 M/R
TP mg/l 2.6 27.6 0.132 M/R
MA-Monthly Average,WA-Weekly Average,DM-Daily Maximum,DA=Daily Average,M/R= Monitor&
Report
Page 2 of 9

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
upstream at NCSR 1451 and downstream at NC Highway 210. Instream monitoring is conducted three
times per week during June, July,August and September, and once per week during the rest of the year.
As the permittee is a member of the Middle Cape Fear River Basin Association(MCFRBA), instream
monitoring requirements are provisionally waived. While no nearby MCFRBA monitoring station is
located upstream of the discharge, AMS station B7280000 is just 2 miles upstream of the discharge.
Additionally,MCFRBA monitoring station B7300000 is located roughly 1 mile downstream of the
discharge. Data was observed from January 2015 to March 2020. This corresponds with the most recent 5
years of data available from AMS station B7280000. The data has been summarized in Table 2 below.
Table 2. Instream Monitoring Data Summary
Parameter Units
Upstream Downstream
Average Max Min Average Max Min
Temperature ° C 17.5 28.1 0.2 17.3 27.7 4.2
DO mg/l 9.4 15.49 6.64 8.9 12.9 6.2
Ammonia mg/1 0.03 0.08 0.02 0.03 0.12 0.02
TKN mg/l 0.4 0.61 0.21 0.5 1.01 0.2
NO2+NO3 mg/1 0.13 0.3 0.03 0.15 0.93 0.02
TP mg/1 0.02 0.04 0.02 0.04 0.166 1 0.02
As the two datasets were not collected concurrently, no statistical analysis could be conducted.
Downstream temperature was not greater than 29 degrees Celsius [per 15A NCAC 02B .0211 (18)]
during the period reviewed.
Average downstream DO was not below 5 mg/L [per 15A NCAC 02B .0211 (6)] during the period
reviewed.
No changes are proposed to instream monitoring requirements for dissolved oxygen and temperature.
Is this facility a member of a Monitoring Coalition with waived instream monitoring (YIN): YES
Name of Monitoring Coalition: Middle Cape Fear River Basin Association
5. Compliance Summary
Summarize the compliance record with permit effluent limits (past 5 years): The facility reported four
TSS limit violations resulting in enforcement in 2020. In 2021,the facility reported two flow limit
violations resulting in enforcement.
Summarize the compliance record with aquatic toxicity test limits and any second species test results
(past 5 years): The facility passed 16 of 16 quarterly chronic toxicity tests from February 2019 to
November 2022.Additionally,the facility passed all 4 second species chronic toxicity tests from February
2018 to August 2020.
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Summarize the results from the most recent compliance inspection: The last facility inspection conducted
in December 2022 reported that the facility was compliant.
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: 1Q10 streamflow(acute Aquatic Life); 7Q10 streamflow(chronic Aquatic
Life;non-carcinogen HH); 30Q2 streamflow(aesthetics); annual average flow(carcinogen,HH).
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
(e.g., BOD=30 mg/l for Municipals)may be appropriate if deemed more stringent based on dilution and
model results.
If permit limits are more stringent than TBELs, describe how limits were developed: Limitations for
summer BOD are based on a 1986 Streeter Phelps model (Level B) for instream DO protection. Winter
BOD limitations use secondary standards. The model considered interactions between the Town of Spring
Lake, Fort Bragg, and Dilton Mobile Home Park discharges.No changes are proposed from the previous
permit limits.
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/1(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: TRC limits have
been reviewed in the attached WLA and have been found to be protective.No changes are proposed.
Limitations for summer ammonia are based on a 1986 Streeter Phelps model(Level B) for instream DO
protection. The ammonia limits have been reviewed in the attached WLA for toxicity and have been
found to be protective.No changes are proposed.
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'h detection limit for"less than"values; and 4) streamflows used for dilution
consideration based on 15A NCAC 213.0206. Effective April 6,2016,NC began implementation of
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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 via effluent pollutant
scans conducted in 2019 and twice in 2020(February and December). 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
• 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:None
• 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:None
• POTW Effluent Pollutant Scan Review: Three effluent pollutant scans 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
o 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
Arsenic, Total Beryllium, Total Cadmium, Total Phenolic Compounds, Total Chromium,
Total Copper, Total Cyanide, Total Lead, Total Nickel, Total Selenium,Total Silver,
Total Zinc
The Town of Spring Lake reported Total Silver at less than detection,with detection levels< 5.0 µg/L
and<0.5 µg/L in their DMR results. The Town's allowable discharge concentration is 1.09 µg/L for
Total Silver. DWR's laboratory identifies the target Practical Quantification Limit(PQL) for Total Silver
as 1.0 µg/L. 15A NCAC 2B .0505 (e) (4)requires that all test procedures must produce detection and
reporting levels that are below the permit discharge requirements and all data generated must be reported
to the approved detection level or lower reporting level of the procedure. If no approved methods are
capable of achieving a detection level below the permit discharge requirement(or allowable discharge
concentration)the method with the lowest detection level must be used. The Town should use sufficiently
sensitive test methods for all pollutants, including when performing Effluent Pollutant Scans.
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
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NPDES permits,using single concentration screening tests,with multiple dilution follow-up upon a test
failure.
Describe proposed toxicity test requirement: This is a Major POTW, and a chronic WET limit at 5.5%
effluent will continue on a quarterly frequency.
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/l.
Table 3. Mercury Effluent Data Summary
2017 2018 2019 2020
#of Samples 2 2 1 1
Annual Average Conc.n /L 4.6 11.3 5.8 4.04
Maximum Conc.,n /L 5.1 15.4 5.83 4.04
TBEL,n /L 47
WQBEL,n /L 218.5
Describe proposed permit actions based on mercury evaluation: Since no annual average mercury
concentration exceeded the WQBEL, and no individual mercury sample exceeded the TBEL,no mercury
limit is required. Since the facility is<2.0 MGD no Mercury Minimization Plan(MMP)is required.
Other TMDL/Nutrient Management Strategy Considerations
If applicable, describe any other TMDLs/Nutrient Management Strategies and their implementation
within this permit: NA
Other WQBEL Considerations
If applicable, describe any other parameters of concern evaluated for WQBELs: As required by Session
Law 2018-5, Senate Bill 99, Section 13.1(r), every applicant shall submit documentation of any additional
pollutants for which there are certified methods with the permit application if their discharge is
anticipated via a Chemical Addendum to NPDES Application table. As an attachment to the permit
application, The Town informed the Division that no monitoring for additional pollutants has been
conducted(see attached chemical addendum)and therefore no additional pollutants of concern have been
identified.
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
1 SA NCAC 2H 0107(c)(2)(B), 40CFR 122.47, and EPA May 2007 Memo:NA
If applicable, describe any water quality standards variances proposed in accordance with NCGS 143-
215.3(e) and 15A NCAC 2B.0226 for this permit renewal:NA
Page 6 of 9

7. Technology-Based Effluent Limitations (TBELs)
Municipals (if not applicable,delete and skip to Industrials)
Are concentration limits in the permit at least as stringent as secondary treatment requirements (30 mg/l
BODS/TSS for Monthly Average, and 45 mg/l 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; overall 85%removal was
achieved for the period reviewed.
If NO,provide a justification (e.g., waste stabilization pond). 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 2B.0201. Each applicant for a new/expanding NPDES permit
must document an effort to consider non-discharge alternatives per 15A NCAC 2H.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.
If applicable, describe the results of the antidegradation review, including the Engineering Alternatives
Analysis (EAA) and any water quality modeling results:NA
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 213.0500;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.
As the Spring Lake WWTP discharges treated wastewater approximately 20 miles upstream of waters
designated as WS-V,monitoring of PFAS chemicals will be added to the permit at a frequency of
quarterly. Since an EPA method for sampling and analyzing PFAS in wastewater is not currently
available,the PFAS sampling requirement in the Permit includes a compliance schedule which delays the
effective date of this requirement until the first full calendar quarter beginning 6 months after EPA has a
final wastewater method in 40 CFR136 published in the Federal Register. This date may be extended
upon request and if there are no NC-certified labs.
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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. While NPDES regulated facilities would initially be required to submit additional
NPDES reports electronically effective December 21, 2020, EPA extended this deadline from December
21,2020,to December 21,2025. The current compliance date, effective January 4,2021,was extended as
a final regulation change published in the November 2, 2020 Federal Register. This permit contains the
requirements for electronic reporting, consistent with Federal requirements.
12.Summary of Proposed Permitting Actions:
Table 4. Current Permit Conditions and Proposed Changes Outfall 001
Parameter Current Permit Proposed Basis for Condition/Change
Change
Flow MA 1.5 MGD No change 15A NCAC 2B .0505
BOD5 Summer: No change WQBEL. 1986 WLA limits; Surface
MA 28.0 mg/1 Water Monitoring, 15A NCAC 2B. 0500
WA 42.0 mg/l
Winter:
MA 30.0 mg/1
WA 45.0 mg/l
Monitor and report 3/Week
NH3-N Summer: No change WQBEL. 1986 WLA limits. Verified in
MA 8.0 mg/1 2022 WLA; Surface Water Monitoring,
WA 24.0 mg/l 15A NCAC 2B. 0500
Monitor and report 3/Week
Winter:
Monitor and report 3/Week
TSS MA 30.0 mg/l No change TBEL. Secondary treatment standards/40
WA 45.0 mg/l CFR 133 / 15A NCAC 2B .0406; Surface
Monitor and report 3/Week Water Monitoring, 15A NCAC 213. 0500
Fecal MA 200/100ml No change WQBEL. State WQ standard, 15A NCAC
coliform WA 400/100ml 2B .0200; Surface Water Monitoring, 15A
Monitor and report 3/Week NCAC 213. 0500
Temperature Monitor and Report Daily No change Surface Water Monitoring, 15A NCAC
213. 0508
DO Summer: No change WQBEL. 1986 WLA limits—limited in
DA>5 mg/l summer and monitor and report only in
Monitor and report 3/Week winter. State WQ standard, 15A NCAC
Winter: 2B .0200; 15A NCAC 02B .0500
Monitor and Report 3/week
pH 6—9 SU No change WQBEL. State WQ standard, 15A NCAC
Monitor and Report 3/week 213 .0200; 15A NCAC 02B .0500
Total DM 28 ug/L No change WQBEL. 2022 WLA. Surface Water
Residual Monitor and Report 3/week Monitoring, 15A NCAC 2B. 0500
Chlorine
TKN No requirement Monitor and For calculation of TN
Report Monthly
NO2+NO3 No requirement Monitor and For calculation of TN
Report Monthly
Page 8 of 9

Total Monitor and Report No change Surface Water Monitoring, 15A NCAC
Nitrogen Monthly 2B. 0500
Total Monitor and Report No change Surface Water Monitoring, 15A NCAC
Phosphorus Monthly 2B. 0500
Add quarterly Evaluation of PFAS contribution:
PFAS No requirement monitoring with pretreatment facility; Implementation
delayed delayed until after EPA certified method
implementation becomes available.
Toxicity Test Chronic limit, 5.5% No change WQBEL. No toxics in toxic amounts.
effluent 15A NCAC 213.0200 and 15A NCAC
213.0500
Cape Fear Special Condition Cape Remove Division may require additional nutrient
Reopener Fear River Basin Nutrient condition monitoring without reopener condition
Monitoring Reopener
Effluent Three times per permit No change; 40 CFR 122
Pollutant cycle conducted in
Scan 2025,2026, 2027
Electronic Electronic Reporting No change In accordance with EPA Electronic
Reporting Special Condition Reporting Rule 2015.
MGD—Million gallons per day,MA- Monthly Average,WA—Weekly Average,DM—Daily Max
13. Public Notice Schedule:
Permit to Public Notice: xx/xx/xxxx
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 filing such request and the
reasons why a hearing is warranted.
14. NPDES Division Contact
If you have any questions regarding any of the above information or on the attached permit,please
contact Nick Coco at(919) 707-3609 or via email at nick.coco(a�deq.nc.gov.
15. 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
16. Fact Sheet Attachments (if applicable):
• RPA Spreadsheet Summary
• NPDES Implementation of Instream Dissolved Metals Standards—Freshwater Standards
• NH3/TRC WLA Calculations
• BOD&TSS Removal Rate Calculations
• Mercury TMDL Calculations
• Monitoring Frequency Reduction Evaluation
• Pretreatment Information Request Form
• WET Testing and Self-Monitoring Summary
• Compliance Inspection Report
• Requested Additional Information
• Chemical Addendum
Page 9 of 9

Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators
MAXIMUM DATA POINTS = 58
REQUIRED DATA ENTRY
Table 1. Project Information Table 2. Parameters of Concern
❑ CHECK IF HQW OR ORW WQS Name WQs Type Chronic Modifier Acute PQL Units
Facility Name Spring Lake WWTP Par01 Arsenic Aquactic Life C 150 FW 340 ug/L
WWTP/WTP Class III Par02 Arsenic Human Health C 10 HH/WS N/A ug/L
Water Supply
NPDES Permit NCO030970 Par03 Beryllium Aquatic Life NC 6.5 FW 65 ug/L
Outfall 001 Par04 Cadmium Aquatic Life NC 0.6045 FW 3.3515 ug/L
Flow, Qw (MGD) 1.500 Par05 Chlorides Aquatic Life NC 230 FW mg/L
Receiving Stream Little River Par06 Chlorinated Phenolic Compounds Water Supply NC 1 A ug/L
HUC Number 03040203 Par07 Total Phenolic Compounds Aquatic Life NC 300 A ug/L
Stream Class C Par08 Chromium III Aquatic Life NC 120.9012 FW 934.3672 ug/L
❑ Apply WS Hardness WQC Par09 Chromium VI Aquatic Life NC 11 FW 16 pg/L
7Q10s (cfs) 40.000 Par10 Chromium, Total Aquatic Life NC N/A FW N/A pg/L
7Q10w (cfs) 83.00 Par11 Copper Aquatic Life NC 8.1021 FW 10.8627 ug/L
30Q2 (cfs) 40.00 Par12 Cyanide Aquatic Life NC 5 FW 22 10 ug/L
QA(cfs) 444.00 Par13 Fluoride Aquatic Life NC 1,800 FW ug/L
1Q10s (cfs) 32.86 Par14 Lead Aquatic Life NC 3.0510 FW 78.8649 ug/L
Effluent Hardness 40 mg/L (Avg) Par15 Mercury Aquatic Life NC 12 FW 0.5 ng/L
------------- ----------------------
Upstream Hardness 25 mg/L (Avg) Par16 Molybdenum Human Health NC 2000 HH ug/L
-------------7 ----------------------
Combined Hardness Chronic 25.82 mg/L Par17 Nickel Aquatic Life NC 38.2669 FW 346.4184 pg/L
------------- ----------------------
Combined Hardness Acute 25.99 mg/L Par18 Nickel Water Supply NC 25.0000 WS N/A pg/L
----------------------
Data Source(s) Note: 7Q10s used as conservative estimate of 30Q2 Par19 Selenium Aquatic Life NC 5 FW 56 ug/L
❑ CHECK TO APPLY MODEL due to lack of 30Q2 information. No hardness data Par20 Silver Aquatic Life NC 0.06 FW 0.3169 ug/L
available due to 100/o domestic; Default value of 25
mg/L used for upstream Par21 Zinc Aquatic Life NC 130.2639 FW 129.9155 ug/L
Par22
Par23
Par24
30970 RPA, input
5/2/2023

REASONABLE POTENTIAL ANALYSIS
H1 H2 Use"PASTE SPECIAL Use"PASTE SPECIAL
Effluent Hardness Values"then"COPY" Upstream Hardness Values"then"COPY"
Maximum data .Maximum data
points=58 points=58
Date Data BDL=1/2DL Results Date Data BDL=1/2DL Results
1 2/27/2020 28 28 Std Dev. 12.0000 1 Default 25 25 Std Dev. N/A
2 1/7/2021 40 40 Mean 40.0000 2 Mean 25.0000
3 8/22/2019 52 52 C.V. (default) 0.6000 3 C.V. 0.0000
4 n 3 4 n 1
5 10th Per value 30.40 mg/L 5 10th Per value 25.00 mg/L
6 Average Value 40.00 mg/L 6 Average Value 25.00 mg/L
7 Max. Value 52.00 mg/L 7 Max. Value 25.00 mg/L
8 8
9 9
10 10
11 11
12 12
13 13
14 14
15 15
16 16
17 17
18 18
19 19
20 20
21 21
22 22
23 23
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25 25
26 26
27 27
28 28
29 29
30 30
31 31
32 32
33 33
34 34
35 35
36 36
37 37
38 38
39 39
40 40
41 41
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43 43
44 44
45 45
46 46
47 47
48 48
49 49
50 50
51 51
52 52
53 53
54 54
55 55
56 56
57 57
58 58
30970 RPA, data
- 1 - 5/2/2023

REASONABLE POTENTIAL ANALYSIS
Par01 & Par02
Use"PASTE SPECIAL
Arsenic Values"then"COPY"
Maximum data
points=58
Date Data BDL=1/2DL Results
1 8/19/2019 < 2 1 Std Dev. 2.3094
2 12/17/2020 < 10 5 Mean 3.6667
3 2/27/2020 < 10 5 C.V. (default) 0.6000
4 n 3
5
6 Mult Factor= 3.00
7 Max. Value 5.0 ug/L
8 Max. Pred Cw 15.0 ug/L
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
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37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
30970 RPA, data
-2 - 5/2/2023

REASONABLE POTENTIAL ANALYSIS
Par03 Par04
Use"PASTE SPECIAL Use"PASTE SPECIAL
Beryllium Values"then"COPY" Cadmium Values"then"COPY"
Maximum data .Maximum data
points=58 points=58
Date Data BDL=1/2DL Results Date Data BDL=1/2DL Results
1 8/19/2019 < 0.5 0.25 Std Dev. 1.2990 1 8/19/2019 < 0.15 0.075 Std Dev. 0.5340
2 12/17/2020 < 5 2.5 Mean 1.7500 2 12/17/2020 < 2 1 Mean 0.6917
3 2/27/2020 < 5 2.5 C.V. (default) 0.6000 3 2/27/2020 < 2 1 C.V. (default) 0.6000
4 n 3 4 n 3
5 5
6 Mult Factor= 3.00 6 Mult Factor= 3.00
7 Max. Value 2.50 ug/L 7 Max. Value 1.000 ug/L
8 Max. Pred Cw 7.50 ug/L 8 Max. Pred Cw 3.000 ug/L
9 9
10 10
11 11
12 12
13 13
14 14
15 15
16 16
17 17
18 18
19 19
20 20
21 21
22 22
23 23
24 24
25 25
26 26
27 27
28 28
29 29
30 30
31 31
32 32
33 33
34 34
35 35
36 36
37 37
38 38
39 39
40 40
41 41
42 42
43 43
44 44
45 45
46 46
47 47
48 48
49 49
50 50
51 51
52 52
53 53
54 54
55 55
56 56
57 57
58 58
30970 RPA, data
-3- 5/2/2023

REASONABLE POTENTIAL ANALYSIS
Par07 use"PASTE Par10
SPECIAL-Values" Use"PASTE SPECIAL-
Total Phenolic Compounds then"COPY". Chromium, Total Values"then"COPY".
Maximum data Maximum data points=
points=58 58
Date Data BDL=1/2DL Results Date Data BDL=1/2DL Results
1 8/19/2019 10 10 Std Dev. 0.5774 1 8/19/2019 < 2 1 Std Dev. 0.8660
2 12/17/2020 11 11 Mean 10.6667 2 12/17/2020 < 5 2.5 Mean 2.0000
3 2/27/2020 11 11 C.V. (default) 0.6000 3 2/27/2020 < 5 2.5 C.V. (default) 0.6000
4 n 3 4 n 3
5 5
6 Mult Factor= 3.00 6 Mult Factor= 3.00
7 Max. Value 11.0 ug/L 7 Max. Value 2.5 pg/L
8 Max. Pred Cw 33.0 ug/L 8 Max. Pred Cw 7.5 pg/L
9 9
10 10
11 11
12 12
13 13
14 14
15 15
16 16
17 17
18 18
19 19
20 20
21 21
22 22
23 23
24 24
25 25
26 26
27 27
28 28
29 29
30 30
31 31
32 32
33 33
34 34
35 35
36 36
37 37
38 38
39 39
40 40
41 41
42 42
43 43
44 44
45 45
46 46
47 47
48 48
49 49
50 50
51 51
52 52
53 53
54 54
55 55
56 56
57 57
58 58
30970 RPA, data
-4- 5/2/2023

REASONABLE POTENTIAL ANALYSIS
Pal Par12
Use"PASTE SPECIAL Use"PASTE SPECIAL
Copper Values"then"COPY" Cyanide Values"then"COPY"
pp .Maximum data y .Maximum data
points=58 points=58
Date Data BDL=1/2DL Results Date Data BDL=1/2DL Results
1 8/19/2019 2 2 Std Dev. 1.7321 1 8/19/2019 < 5 5 Std Dev. 0.0000
2 12/17/2020 5 5 Mean 4.0000 2 12/17/2020 < 5 5 Mean 5.00
3 2/27/2020 5 5 C.V. (default) 0.6000 3 2/27/2020 < 5 5 C.V. (default) 0.6000
4 n 3 4 n 3
5 5
6 Mult Factor= 3.00 6 Mult Factor= 3.00
7 Max. Value 5.00 ug/L 7 Max. Value 5.0 ug/L
8 Max. Pred Cw 15.00 ug/L 8 Max. Pred Cw 15.0 ug/L
9 9
10 10
11 11
12 12
13 13
14 14
15 15
16 16
17 17
18 18
19 19
20 20
21 21
22 22
23 23
24 24
25 25
26 26
27 27
28 28
29 29
30 30
31 31
32 32
33 33
34 34
35 35
36 36
37 37
38 38
39 39
40 40
41 41
42 42
43 43
44 44
45 45
46 46
47 47
48 48
49 49
50 50
51 51
52 52
53 53
54 54
55 55
56 56
57 57
58 58
30970 RPA, data
- 5- 5/2/2023

REASONABLE POTENTIAL ANALYSIS
Par14 Par17 & Par18 use"PASTE
Use"PASTE SPECIAL SPECIAL-
Values"then"COPY" Values"then
Lead .Maximum data Nickel "Copy.,.
points=58 Maximum data
Date BDL=1/2DL Results Date Data BDL=1/2DL Results points=58
1 8/19/2019 < 0.5 0.25 Std Dev. 2.7424 1 8/19/2019 2.7 2.7 Std Dev. 1.3279
2 12/17/2020 < 10 5 Mean 3.4167 2 12/17/2020 < 10 5 Mean 4.2333
3 2/27/2020 < 10 5 C.V. (default) 0.6000 3 2/27/2020 < 10 5 C.V. (default) 0.6000
4 n 3 4 n 3
5 5
6 Mult Factor= 3.00 6 Mult Factor= 3.00
7 Max. Value 5.000 ug/L 7 Max. Value 5.0 pg/L
8 Max. Pred Cw 15.000 ug/L 8 Max. Pred Cw 15.0 pg/L
9 9
10 10
11 11
12 12
13 13
14 14
15 15
16 16
17 17
18 18
19 19
20 20
21 21
22 22
23 23
24 24
25 25
26 26
27 27
28 28
29 29
30 30
31 31
32 32
33 33
34 34
35 35
36 36
37 37
38 38
39 39
40 40
41 41
42 42
43 43
44 44
45 45
46 46
47 47
48 48
49 49
50 50
51 51
52 52
53 53
54 54
55 55
56 56
57 57
58 58
30970 RPA, data
-6- 5/2/2023

REASONABLE POTENTIAL ANALYSIS
Par19 Par20
Use"PASTE SPECIAL- Use"PASTE SPECIAL
Values"then"COPY". Values"then"COPY"
Selenium Maximum data points Silver .Maximum data
=58 points=58
Date Data BDL=1/2DL Results Date Data BDL=1/2DL Results
1 8/19/2019 < 2 1 Std Dev. 2.3094 1 8/19/2019 < 0.5 0.25 Std Dev. 1.2990
2 12/17/2020 < 10 5 Mean 3.6667 2 12/17/2020 < 5 2.5 Mean 1.7500
3 2/27/2020 < 10 5 C.V. (default) 0.6000 3 2/27/2020 < 5 2.5 C.V. (default) 0.6000
4 n 3 4 n 3
5 5
6 Mult Factor= 3.00 6 Mult Factor= 3.00
7 Max. Value 5.0 ug/L 7 Max. Value 2.500 ug/L
8 Max. Pred Cw 15.0 ug/L 8 Max. Pred Cw 7.500 ug/L
9 9
10 10
11 11
12 12
13 13
14 14
15 15
16 16
17 17
18 18
19 19
20 20
21 21
22 22
23 23
24 24
25 25
26 26
27 27
28 28
29 29
30 30
31 31
32 32
33 33
34 34
35 35
36 36
37 37
38 38
39 39
40 40
41 41
42 42
43 43
44 44
45 45
46 46
47 47
48 48
49 49
50 50
51 51
52 52
53 53
54 54
55 55
56 56
57 57
58 58
30970 RPA, data
- 7- 5/2/2023

REASONABLE POTENTIAL ANALYSIS
Par21
Use"PASTE SPECIAL
ZIIIC Values"then"COPY"
Maximum data
points=58
Date Data BDL=1/2DL Results
1 8/19/2019 71 71 Std Dev. 79.3872
2 12/17/2020 208 208 Mean 116.3333
3 2/27/2020 70 70 C.V. (default) 0.6000
4 n 3
5
6 Mult Factor= 3.00
7 Max. Value 208.0 ug/L
8 Max. Pred Cw 624.0 ug/L
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
30970 RPA, data
- 8- 5/2/2023

Spring Lake WWTP > Outfall 001
NCO030970 Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators Qw = 1 .5 MGD
MAXIMUM DATA POINTS = 58
Qw (MGD) = 1.5000 WWTP/WTP Class: III COMBINED HARDNESS (mg/L)
1Q10S (cfs) = 32.86 IWC% @ 1Q10S = 6.607929515 Acute 25.99 mg/L
7Q10S (cfs) = 40.00 IWC% @ 7QIOS = 5.493207324 Chronic = 25.82 mg/L
7Ql0W (cfs) = 83.00 IWC% @ 7Q10W= 2.724875476
30Q2 (cfs) = 40.00 IWC% @ 30Q2 = 5.493207324
Avg. Stream Flow, QA(cfs)= 444.00 IW%C @ QA= 0.520920854
Receiving Stream: Little River HUC 03040203 Stream Class: C
PARAMETER NC STANDARDS OR EPA CRITERIA J co REASONABLE POTENTIAL RESULTS RECOMMENDED ACTION
TYPE Chronic Applied Standard Acute n # Det. Max Pred Cw Allowable Cw
Acute (FW): 5,145.3
Arsenic C 150 FW(7QI Os) 340 ug/L
3 0 15.0 Chronic (FW): 2,730.6 No RP, Predicted Max< 50% of Allowable Cw- No
C.V. (default) Max MDL_ 10 Monitoring required
Arsenic C 10 HH/WS(Qavg) ug/L Note: n < 9 NO DETECTS Chronic (HH): 1,919.7
Limited data set Max MDL- 10
Acute: 983.67
Beryllium NC 6.5 FW(7Q10s) 65 ug/L 3 0 7.50 _
Note: n < 9 C.V. (default) Chronic 118.33 No RP, Predicted Max< 50% of Allowable Cw- No
Limited data set NO DETECTS Max MDL= 5 Monitoring required
Acute: 50.719
Cadmium NC 0.6045 FW(701 Os) 3.3515 ug/L 3 0 3.000 _
Note: n < 9 C.V. (default) Chronic 11.005 No RP, Predicted Max< 50% of Allowable Cw- No
Limited data set NO DETECTS Max MDL=2 Monitoring required
Acute: NO WQS
Total Phenolic Compounds NC 300 A(30Q2) ug/L 3 3 33.0 _
Note: n < 9 C.V. (default) Chronic 5,461.3 No RP, Predicted Max< 50% of Allowable Cw- No
Limited data set No value >Allowable Cw Monitoring required
Acute: 14,140.1
Chromium III NC 120.9012 FW(7QIOs) 934.3672 µg/L 0 0 N/A
Chronic----- 2,200.9 - -----------------------------
Acute: 242.1
Chromium VI NC I 1 FW(7Q10s) 16 µg/L 0 0 N/A
Chronic----- 200.2-- -----------------------------
a: No monitoring required if all Total Chromium
Chromium, Total NC µg/L 3 0 7.5 Max reported value = 2.5 samples are < 5 pg/L or Pred. max for Total Cr is <
Note: n < 9 C.V. (default) allowable Cw for Cr VI.
Limited data set NO DETECTS Max MDL= 5
Acute: 164.39
Copper NC 8.1021 FW(7Q I Os) 10.8627 ug/L 3 3 15.00
Note: n < 9 C.V. (default) Chronic: 147.49 No RP, Predicted Max< 50% of Allowable Cw- No
Limited data set No value >Allowable Cw Monitoring required
Acute: 332.9
Cyanide NC 5 FW(701 Os) 22 10 ug/L 3 0 15.0 _
Note: n < 9 C.V. (default) Chronic 91.0 No RP, Predicted Max< 50% of Allowable Cw- No
Limited data set NO DETECTS Max MDL= 10 Monitoring required
Acute: 1,193.489
Lead NC 3.0510 FW(7Q 1 Os) 78.8649 ug/L 3 0 15.000 _
Note: n < 9 C.V. (default) Chronic 55.541 ]No RP, Predicted Max< 50% of Allowable Cw- No
Limited data set NO DETECTS Max MDL= 10 Monitoring required
30970 RPA, rpa
Page 1 of 2 5/2/2023

Spring Lake WWTP > Outfall 001
NCO030970 Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators Qw = 1 .5 MGD
Acute (FW): 5,242.5
Nickel NC 38.2669 FW(7Q10s) 346.4184 µg/L
3 1 15.0 Chronic (FW): 696.6 No RP, Predicted Max< 50% of Allowable Cw- No
Note: n < 9 C.V. (default) No value >Allowable Cw Monitoring required
Nickel NC 25.0000 WS(7QlOs) µg/L Limited data set Chronic (WS): 455.1
No value >Allowable Cw
Acute: 847.5
Selenium NC 5 FW(7QlOs) 56 ug/L 3 0 15.0 ______
Note: n < 9 C.V. (default) Chronic 91.0
No RP, Predicted Max< 50% of Allowable Cw- No
Limited data set NO DETECTS Max MDL= 10 Monitoring required
Acute: 4.796
Silver NC 0.06 FW(7Q10s) 0.3169 ug/L 3 0 7.500
Note: n < 9 C.V. (default) Chronic: 1.092 All values non-detect < 5 ug/L and < 0.5 ug/L; No
monitoring required; Permittee shall report using PQL
Limited data set NO DETECTS Max MDL= 5 < 1 ug/L.
Acute: 1,966.1 No RP, Predicted Max< 50% of Allowable Cw- No
Zinc NC 130.2639 FW(7Q10s) 129.9155 ug/L 3 3 624.0 Monitoring required
Note: n < 9 C.V. (default) Chronic 2,371.4
Limited data set No value >Allowable Cw
30970 RPA, rpa
Page 2 of 2 5/2/2023

Permit No. NCO030970
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 Q ality Standards/A uatic Life Protection
Parameter Acute FW, µg/l Chronic FW, µg/l Acute SW, µg/1 Chronic SW, µg/1
(Dissolved) (Dissolved) (Dissolved) (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
2B.0200(e.g., arsenic at 10 µg/1 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-[ln hardness](0.041838)} e^10.9151 [ln hardness]-3.1485}
Cadmium,Acute Trout waters WER*{1.136672-[ln hardness](0.041838)} e^{0.9151[In hardness]-3.62361
Cadmium,Chronic WER*{1.101672-[ln hardness](0.041838)} •e^{0.7998[ln hardness]-4.445 11
Chromium III,Acute WER*0.316 e^{0.8190[ln hardness]+3.7256}
Chromium III,Chronic WER*0.860 e^{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-[ln hardness](0.145712)} • e^{1.273[ln hardness]-1.460}
Lead,Chronic WER*{1.46203-[ln 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 e^{0.8460[ln hardness]+0.0584}
Page 1 of 4

Permit No. NCO030970
Silver,Acute WER*0.85 •e^{1.72[ln hardness]-6.59}
Silver,Chronic Not applicable
Zinc,Acute WER*0.978 e^{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 (RPA)
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.
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 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. NCO030970
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)+s7Q10, cfs *Avg. Upstream Hardness,mg/L)
(Permitted Flow,cfs+s7Q10,cfs)
The Combined Hardness for acute is the same but the calculation uses the IQ 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 I + { [Kpo] [ss('+a)] [10-6] }
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=(s7Q 10+Qw)(Cwgs)—(s7Q 10) (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 s7Q 10 may be incorporated as applicable:
IQ 10=used in the equation to protect aquatic life from acute toxicity
Page 3 of 4

Permit No. NC0030970
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
6. 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.
8. 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) 40 Average from 2019 and 2020
[Total as, CaCO3 or(Ca+Mg)] Effluent Pollutant Scans
Average Upstream Hardness (mg/L) 25 Default used; Upstream data not
[Total as, CaCO3 or(Ca+Mg)] available.
7Q 10 summer(cfs) 40 Historical file;previous fact sheet
1Q10(cfs) 32.86 Calculated in RPA
Permitted Flow(MGD) 1.5 NPDES Files
Date: 5/2/2022
Permit Writer: Nick Coco
Page 4 of 4

NCO030970 Spring Lake WWTP 5/2/2023
BOD monthly removal rate TSS monthly removal rate
Month RR(%) Month RR(%) Month RR(%) Month RR(%)
August-18 96.84 February-21 91.49 August-18 95.52 February-21 87.60
September-18 95.42 March-21 97.22 September-18 92.84 March-21 95.28
October-18 85.26 April-21 97.52 October-18 75.44 April-21 95.64
November-18 88.60 May-21 96.61 November-18 80.66 May-21 97.48
December-18 95.99 June-21 94.50 December-18 82.79 June-21 94.13
January-19 97.14 July-21 98.26 January-19 94.63 July-21 97.65
February-19 90.96 August-21 97.60 February-19 92.08 August-21 96.15
March-19 96.10 September-21 97.98 March-19 94.52 September-21 96.12
April-19 97.52 October-21 98.02 April-19 96.47 October-21 95.49
May-19 97.95 November-21 98.64 May-19 96.61 November-21 97.98
June-19 96.77 December-21 97.79 June-19 97.93 December-21 96.45
July-19 96.00 January-22 97.98 July-19 94.52 January-22 97.93
August-19 98.29 February-22 98.10 August-19 97.59 February-22 95.22
September-19 98.32 March-22 96.51 September-19 97.96 March-22 94.03
October-19 97.85 April-22 96.29 October-19 97.06 April-22 96.74
November-19 98.14 May-22 96.49 November-19 97.31 May-22 93.16
December-19 98.35 June-22 97.35 December-19 98.20 June-22 95.27
January-20 98.11 July-22 97.18 January-20 97.42 July-22 95.02
February-20 98.54 August-22 98.39 February-20 97.59 August-22 97.15
March-20 98.09 September-22 98.35 March-20 96.31 September-22 97.99
April-20 98.68 October-22 98.49 April-20 97.99 October-22 98.30
May-20 95.31 November-22 98.20 May-20 97.28 November-22 97.43
June-20 94.76 December-22 97.84 June-20 94.41 December-22 97.61
July-20 97.81 January-23 July-20 96.03 January-23
August-20 96.71 February-23 August-20 92.13 February-23
September-20 96.53 March-23 September-20 90.42 March-23
October-20 96.82 April-23 October-20 95.19 April-23
November-20 95.73 May-23 November-20 91.23 May-23
December-20 90.27 June-23 December-20 65.28 June-23
January-21 91.66 July-23 January-21 79.87 July-23
Overall BOD removal rate 96.41 Overall TSS removal rate 93.95

6/1/23 WQS = 12 ng/L MERCURY WQBEL/TBEL EVALUATION V:2013-6
Facility Name
Spring Lake WWTP/NC0030970 No Limit Required
/Permit No.
No MMP Required
Total Mercury 1631E PQL=0.5 ng/L 7Q10s = 40.000 cfs WQBEL= 218.45 ng/L
Date Modifier Data Entry Value Permitted Flow= 1.500 47 ng/L
2/23/17 4.04 4.04
3/17/17 5.1 5.1 4.6 ng/L-Annual Average for 2017
2/16/18 7.13 7.13
8/23/18 15.4 15.4 11.3 ng/L-Annual Average for 2018
8/15/19 5.83 5.83 5.8 ng/L-Annual Average for 2019
12/10/20 4.04 4.04 4.0 ng/L-Annual Average for 2020

Spring Lake WWTP/NC0030970
Mercury Data Statistics (Method 1631E)
2017 2018 2019 2020
#of Samples 2 2 1 1
Annual Average, ng/L 4.6 11.3 5.8 4.04
Maximum Value, ng/L 5.10 15.40 5.83 4.04
TBEL, ng/L 47
WQBEL, ng/L 218.5

NH3/TRC WLA Calculations
Facility: Spring Lake WWTP
PermitNo. NC0030970
Prepared By: Nick Coco
Enter Design Flow (MGD): 1.5
Enter s7Q10 (cfs): 40
Enter w7Q10 (cfs): 83
Total Residual Chlorine (TRC) Ammonia (Summer)
Daily Maximum Limit (ug/1) Monthly Average Limit(mg NH3-N/1)
s7Q10 (CFS) 40 s7Q10 (CFS) 40
DESIGN FLOW (MGD) 1.5 DESIGN FLOW (MGD) 1.5
DESIGN FLOW (CFS) 2.325 DESIGN FLOW (CFS) 2.325
STREAM STD (UG/L) 17.0 STREAM STD (MG/L) 1.0
Upstream Bkgd (ug/1) 0 Upstream Bkgd (mg/1) 0.22
IWC (%) 5.49 IWC (%) 5.49
Allowable Conc. (ug/1) 309 Allowable Conc. (mg/1) 14.4
Cap at 28 uq/L.Consistent with current limit. Less stringent than current limit.Maintain limit.
Maintain limit.
Ammonia (Winter)
Monthly Average Limit(mg NH3-N/1)
Fecal Coliform w7Q10 (CFS) 83
Monthly Average Limit: 200/100ml DESIGN FLOW (MGD) 1.5
(If DF >331; Monitor) DESIGN FLOW (CFS) 2.325
(If DF<331; Limit) STREAM STD (MG/L) 1.8
Dilution Factor(DF) 18.20 Upstream Bkgd (mg/1) 0.22
IWC (%) 2.72
Allowable Conc. (mg/1) 58.2
>35 mg/L;Monitor and Report.
Consistent with current requirements.Maintain monitoring.
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/l, Monitor Only
2. Monthly Avg limit x 3 = Weekly Avg limit (Municipals)
3. Monthly Avg limit x 5 = Daily Max limit(Non-Munis)
If the allowable ammonia concentration is > 35 mg/L, no limit shall be imposed
Fecal Coliform
1. Monthly Avg limit x 2 =400/100 ml = Weekly Avg limit (Municipals) = Daily Max limit (Non-Muni)

MONITORING REPORT(MR)VIOLATIONS for: Report Date: 03/16/22 Page 1 of 6
Permit: NCO030970 MRS Betweei 3 - 2018 and 3 - 2023 Region: % Violation Category:Limit Violation Program Category:
Facility Name:% Param Nam(% County: % Subbasin:% Violation Action:%
Major Minor: %
PERMIT: NCO030970 FACILITY: Town of Spring Lake-Spring Lake WWTP COUNTY: Cumberland REGION: Fayetteville
Limit Violation
MONITORING VIOLATION UNIT OF CALCULATED %
REPORT OUTFALL LOCATION PARAMETER DATE FREQUENCY MEASURE LIMIT VALUE Over VIOLATION TYPE VIOLATION ACTION
05-2018 001 Effluent Chlorine,Total Residual 05/09/18 3 X week ug/I 28 30 7.1 Daily Maximum No Action, BPJ
Exceeded
06-2018 001 Effluent Chlorine,Total Residual 06/18/18 3 X week ug/I 28 30 7.1 Daily Maximum No Action, BPJ
Exceeded
08-2018 001 Effluent Chlorine,Total Residual 08/22/18 3 X week ug/I 28 29 3.6 Daily Maximum No Action, BPJ
Exceeded
10-2018 001 Effluent Chlorine,Total Residual 10/16/18 3 Xweek ug/I 28 498 1,678.6 Daily Maximum No Action, BPJ
Exceeded
10-2018 001 Effluent Chlorine,Total Residual 10/17/18 3 X week ug/I 28 545 1,846.4 Daily Maximum No Action, BPJ
Exceeded
10-2018 001 Effluent Chlorine,Total Residual 10/18/18 3 X week ug/I 28 746 2,564.3 Daily Maximum No Action, BPJ
Exceeded
10-2018 001 Effluent Chlorine,Total Residual 10/19/18 3 X week ug/I 28 487 1,639.3 Daily Maximum No Action, BPJ
Exceeded
10-2018 001 Effluent Chlorine,Total Residual 10/22/18 3 X week ug/I 28 277 889.3 Daily Maximum No Action, BPJ
Exceeded
10-2018 001 Effluent Chlorine,Total Residual 10/23/18 3 Xweek ug/I 28 317 1,032.1 Daily Maximum No Action, BPJ
Exceeded
10-2018 001 Effluent Chlorine,Total Residual 10/24/18 3 X week ug/I 28 346 1,135.7 Daily Maximum No Action, BPJ
Exceeded
10-2018 001 Effluent Chlorine,Total Residual 10/25/18 3 Xweek ug/I 28 354 1,164.3 Daily Maximum No Action, BPJ
Exceeded
10-2018 001 Effluent Chlorine,Total Residual 10/26/18 3 X week ug/I 28 486 1,635.7 Daily Maximum No Action, BPJ
Exceeded
10-2018 001 Effluent Chlorine,Total Residual 10/29/18 3 X week ug/I 28 170 507.1 Daily Maximum No Action, BPJ
Exceeded
10-2018 001 Effluent Chlorine,Total Residual 10/30/18 3 X week ug/I 28 150 435.7 Daily Maximum No Action, BPJ
Exceeded
10-2018 001 Effluent Chlorine,Total Residual 10/31/18 3 X week ug/I 28 233 732.1 Daily Maximum No Action, BPJ
Exceeded
11-2018 001 Effluent Chlorine,Total Residual 11/01/18 3 X week ug/I 28 298 964.3 Daily Maximum No Action, BPJ
Exceeded

MONITORING REPORT(MR) VIOLATIONS for: Report Date: 03/16/22 Page 2 of 6
Permit: NCO030970 MRS Betweel 3 - 2018 and 3 - 2023 Region: % Violation Category:Limit Violation Program Category:
Facility Name:% Param Nam(% County: % Subbasin:% Violation Action:%
Major Minor: %
PERMIT: NCO030970 FACILITY: Town of Spring Lake-Spring Lake WWTP COUNTY: Cumberland REGION: Fayetteville
Limit Violation
MONITORING VIOLATION UNIT OF CALCULATED %
REPORT OUTFALL LOCATION PARAMETER DATE FREQUENCY MEASURE LIMIT VALUE Over VIOLATION TYPE VIOLATION ACTION
11-2018 001 Effluent Chlorine,Total Residual 11/02/18 3 X week ug/I 28 388 1,285.7 Daily Maximum No Action, BPJ
Exceeded
11-2018 001 Effluent Chlorine,Total Residual 11/05/18 3 X week ug/I 28 294 950 Daily Maximum No Action, BPJ
Exceeded
11-2018 001 Effluent Chlorine,Total Residual 11/06/18 3 X week ug/I 28 246 778.6 Daily Maximum No Action, BPJ
Exceeded
11-2018 001 Effluent Chlorine,Total Residual 11/07/18 3 X week ug/I 28 274 878.6 Daily Maximum No Action, BPJ
Exceeded
11-2018 001 Effluent Chlorine,Total Residual 11/08/18 3 X week ug/I 28 146 421.4 Daily Maximum No Action, BPJ
Exceeded
11-2018 001 Effluent Chlorine,Total Residual 11/09/18 3 X week ug/I 28 274 878.6 Daily Maximum No Action, BPJ
Exceeded
11-2018 001 Effluent Chlorine,Total Residual 11/13/18 3 X week ug/I 28 164 485.7 Daily Maximum No Action, BPJ
Exceeded
11-2018 001 Effluent Chlorine,Total Residual 11/14/18 3 X week ug/I 28 173 517.9 Daily Maximum No Action, BPJ
Exceeded
11-2018 001 Effluent Chlorine,Total Residual 11/15/18 3 X week ug/I 28 363 1,196.4 Daily Maximum No Action, BPJ
Exceeded
11-2018 001 Effluent Chlorine,Total Residual 11/16/18 3 X week ug/I 28 430 1,435.7 Daily Maximum No Action, BPJ
Exceeded
11-2018 001 Effluent Chlorine,Total Residual 11/19/18 3 X week ug/I 28 196 600 Daily Maximum No Action, BPJ
Exceeded
11-2018 001 Effluent Chlorine,Total Residual 11/20/18 3 X week ug/I 28 212 657.1 Daily Maximum No Action, BPJ
Exceeded
11-2018 001 Effluent Chlorine,Total Residual 11/21/18 3 X week ug/I 28 197 603.6 Daily Maximum No Action, BPJ
Exceeded
11-2018 001 Effluent Chlorine,Total Residual 11/26/18 3 X week ug/I 28 246 778.6 Daily Maximum No Action, BPJ
Exceeded
11-2018 001 Effluent Chlorine,Total Residual 11/27/18 3 X week ug/I 28 228 714.3 Daily Maximum No Action, BPJ
Exceeded
11-2018 001 Effluent Chlorine,Total Residual 11/28/18 3 X week ug/I 28 260 828.6 Daily Maximum No Action, BPJ
Exceeded

MONITORING REPORT(MR) VIOLATIONS for: Report Date: 03/16/22 Page 3 of 6
Permit: NCO030970 MRS Betweel 3 - 2018 and 3 - 2023 Region: % Violation Category:Limit Violation Program Category:
Facility Name:% Param Nam(% County: % Subbasin:% Violation Action:%
Major Minor: %
PERMIT: NCO030970 FACILITY: Town of Spring Lake-Spring Lake WWTP COUNTY: Cumberland REGION: Fayetteville
Limit Violation
MONITORING VIOLATION UNIT OF CALCULATED %
REPORT OUTFALL LOCATION PARAMETER DATE FREQUENCY MEASURE LIMIT VALUE Over VIOLATION TYPE VIOLATION ACTION
11-2018 001 Effluent Chlorine,Total Residual 11/29/18 3 X week ug/I 28 261 832.1 Daily Maximum No Action, BPJ
Exceeded
11-2018 001 Effluent Chlorine,Total Residual 11/30/18 3 X week ug/I 28 295 953.6 Daily Maximum No Action, BPJ
Exceeded
12-2018 001 Effluent Chlorine,Total Residual 12/14/18 3 X week ug/I 28 44 57.1 Daily Maximum No Action, BPJ
Exceeded
01-2019 001 Effluent Chlorine,Total Residual 01/09/19 3 X week ug/I 28 36 28.6 Daily Maximum No Action, BPJ
Exceeded
01-2019 001 Effluent Chlorine,Total Residual 01/16/19 3 X week ug/I 28 34 21.4 Daily Maximum No Action, BPJ
Exceeded
01-2019 001 Effluent Chlorine,Total Residual 01/24/19 3 X week ug/I 28 39 39.3 Daily Maximum No Action, BPJ
Exceeded
01-2019 001 Effluent Chlorine,Total Residual 01/30/19 3 X week ug/I 28 47 67.9 Daily Maximum No Action, BPJ
Exceeded
01-2019 001 Effluent Chlorine,Total Residual 01/31/19 3 X week ug/I 28 43 53.6 Daily Maximum No Action, BPJ
Exceeded
02-2019 001 Effluent Chlorine,Total Residual 02/27/19 3 X week ug/I 28 34 21.4 Daily Maximum No Action, BPJ
Exceeded
03-2019 001 Effluent Chlorine,Total Residual 03/19/19 3 X week ug/I 28 40 42.9 Daily Maximum No Action, BPJ
Exceeded
03-2019 001 Effluent Chlorine,Total Residual 03/25/19 3 X week ug/I 28 31 10.7 Daily Maximum No Action, BPJ
Exceeded
04-2019 001 Effluent Chlorine,Total Residual 04/02/19 3 X week ug/I 28 34 21.4 Daily Maximum No Action, BPJ
Exceeded
04-2019 001 Effluent Chlorine,Total Residual 04/16/19 3 X week ug/I 28 32 14.3 Daily Maximum No Action, BPJ
Exceeded
04-2019 001 Effluent Chlorine,Total Residual 04/18/19 3 X week ug/I 28 45 60.7 Daily Maximum No Action, BPJ
Exceeded
05-2019 001 Effluent Chlorine,Total Residual 05/15/19 3 X week ug/I 28 31 10.7 Daily Maximum No Action, BPJ
Exceeded
05-2019 001 Effluent Chlorine,Total Residual 05/23/19 3 X week ug/I 28 30 7.1 Daily Maximum No Action, BPJ
Exceeded

MONITORING REPORT(MR) VIOLATIONS for: Report Date: 03/16/22 Page 4 of 6
Permit: NCO030970 MRS Betweel 3 - 2018 and 3 - 2023 Region: % Violation Category:Limit Violation Program Category:
Facility Name:% Param Nam(% County: % Subbasin:% Violation Action:%
Major Minor: %
PERMIT: NCO030970 FACILITY: Town of Spring Lake-Spring Lake WWTP COUNTY: Cumberland REGION: Fayetteville
Limit Violation
MONITORING VIOLATION UNIT OF CALCULATED %
REPORT OUTFALL LOCATION PARAMETER DATE FREQUENCY MEASURE LIMIT VALUE Over VIOLATION TYPE VIOLATION ACTION
06-2019 001 Effluent Chlorine,Total Residual 06/19/19 3 X week ug/I 28 36 28.6 Daily Maximum No Action, BPJ
Exceeded
08-2019 001 Effluent Chlorine,Total Residual 08/26/19 3 X week ug/I 28 38 35.7 Daily Maximum No Action, BPJ
Exceeded
11-2019 001 Effluent Chlorine,Total Residual 11/21/19 3 X week ug/I 28 34 21.4 Daily Maximum No Action, BPJ
Exceeded
02-2020 001 Effluent Chlorine,Total Residual 02/20/20 3 X week ug/I 28 30 7.1 Daily Maximum No Action, BPJ
Exceeded
03-2020 001 Effluent Chlorine,Total Residual 03/25/20 3 X week ug/I 28 34 21.4 Daily Maximum No Action, BPJ
Exceeded
04-2020 001 Effluent Chlorine,Total Residual 04/13/20 3 X week ug/I 28 33 17.9 Daily Maximum No Action, BPJ
Exceeded
05-2020 001 Effluent Chlorine,Total Residual 05/22/20 3 X week ug/I 28 29 3.6 Daily Maximum No Action, BPJ
Exceeded
01-2021 001 Effluent Chlorine,Total Residual 01/06/21 3 X week ug/I 28 33 17.9 Daily Maximum No Action, BPJ
Exceeded
03-2021 001 Effluent Chlorine,Total Residual 03/12/21 3 X week ug/I 28 31 10.7 Daily Maximum No Action, BPJ
Exceeded
03-2021 001 Effluent Chlorine,Total Residual 03/24/21 3 X week ug/I 28 35 25 Daily Maximum No Action, BPJ
Exceeded
04-2021 001 Effluent Chlorine,Total Residual 04/27/21 3 X week ug/I 28 30 7.1 Daily Maximum No Action, BPJ
Exceeded
04-2021 001 Effluent Chlorine,Total Residual 04/28/21 3 X week ug/I 28 31 10.7 Daily Maximum No Action, BPJ
Exceeded
05-2021 001 Effluent Chlorine,Total Residual 05/06/21 3 X week ug/I 28 35 25 Daily Maximum No Action, BPJ
Exceeded
06-2021 001 Effluent Chlorine,Total Residual 06/02/21 3 X week ug/I 28 33 17.9 Daily Maximum No Action, BPJ
Exceeded
06-2021 001 Effluent Chlorine,Total Residual 06/15/21 3 X week ug/I 28 30 7.1 Daily Maximum No Action, BPJ
Exceeded
07-2021 001 Effluent Chlorine,Total Residual 07/01/21 3 X week ug/I 28 29 3.6 Daily Maximum No Action, BPJ
Exceeded

MONITORING REPORT(MR) VIOLATIONS for: Report Date: 03/16/22 Page 5 of 6
Permit: NCO030970 MRS Betweel 3 - 2018 and 3 - 2023 Region: % Violation Category:Limit Violation Program Category:
Facility Name:% Param Nam(% County: % Subbasin:% Violation Action:%
Major Minor: %
PERMIT: NCO030970 FACILITY: Town of Spring Lake-Spring Lake WWTP COUNTY: Cumberland REGION: Fayetteville
Limit Violation
MONITORING VIOLATION UNIT OF CALCULATED %
REPORT OUTFALL LOCATION PARAMETER DATE FREQUENCY MEASURE LIMIT VALUE Over VIOLATION TYPE VIOLATION ACTION
07-2021 001 Effluent Chlorine,Total Residual 07/21/21 3 X week ug/I 28 32 14.3 Daily Maximum No Action, BPJ
Exceeded
09-2021 001 Effluent Chlorine,Total Residual 09/07/21 3 X week ug/I 28 30 7.1 Daily Maximum No Action, BPJ
Exceeded
09-2021 001 Effluent Chlorine,Total Residual 09/27/21 3 X week ug/I 28 30 7.1 Daily Maximum No Action, BPJ
Exceeded
12-2021 001 Effluent Chlorine,Total Residual 12/08/21 3 X week ug/I 28 29 3.6 Daily Maximum No Action, BPJ
Exceeded
05-2022 001 Effluent Chlorine,Total Residual 05/04/22 3 X week ug/I 28 33 17.9 Daily Maximum No Action, BPJ
Exceeded
05-2022 001 Effluent Chlorine,Total Residual 05/17/22 3 X week ug/I 28 30 7.1 Daily Maximum No Action, BPJ
Exceeded
08-2022 001 Effluent Chlorine,Total Residual 08/17/22 3 X week ug/I 28 30 7.1 Daily Maximum No Action, BPJ
Exceeded
11-2022 001 Effluent Chlorine,Total Residual 11/08/22 3 X week ug/I 28 31 10.7 Daily Maximum No Action, BPJ
Exceeded
11-2022 001 Effluent Chlorine,Total Residual 11/30/22 3 X week ug/I 28 30 7.1 Daily Maximum No Action, BPJ
Exceeded
12-2022 001 Effluent Chlorine,Total Residual 12/15/22 3 X week ug/I 28 29 3.6 Daily Maximum No Action, BPJ
Exceeded
01-2023 001 Effluent Chlorine,Total Residual 01/12/23 3 X week ug/I 28 32 14.3 Daily Maximum No Action, BPJ
Exceeded
01-2023 001 Effluent Chlorine,Total Residual 01/31/23 3 X week ug/I 28 34 21.4 Daily Maximum No Action, BPJ
Exceeded
09-2018 001 Effluent Coliform, Fecal MF, MFC 09/22/18 3 X week #/100ml 400 600 50 Weekly Geometric Mean No Action, BPJ
Broth,44.5 C Exceeded
09-2018 001 Effluent Coliform, Fecal MF, MFC 09/29/18 3 X week #/100ml 400 1,098.83 174.7 Weekly Geometric Mean No Action, BPJ
Broth,44.5 C Exceeded
10-2018 001 Effluent Coliform, Fecal MF, MFC 10/06/18 3 X week #/100ml 400 600 50 Weekly Geometric Mean No Action, BPJ
Broth,44.5 C Exceeded
10-2018 001 Effluent Coliform, Fecal MF, MFC 10/13/18 3 X week #/100ml 400 600 50 Weekly Geometric Mean No Action, BPJ
Broth,44.5 C Exceeded

MONITORING REPORT(MR) VIOLATIONS for: Report Date: 03/16/22 Page 6 of 6
Permit: NCO030970 MRS Betweel 3 - 2018 and 3 - 2023 Region: % Violation Category:Limit Violation Program Category:
Facility Name:% Param Nam(% County: % Subbasin:% Violation Action:%
Major Minor: %
PERMIT: NCO030970 FACILITY: Town of Spring Lake-Spring Lake WWTP COUNTY: Cumberland REGION: Fayetteville
Limit Violation
MONITORING VIOLATION UNIT OF CALCULATED %
REPORT OUTFALL LOCATION PARAMETER DATE FREQUENCY MEASURE LIMIT VALUE Over VIOLATION TYPE VIOLATION ACTION
10-2018 001 Effluent Coliform, Fecal MF, MFC 10/20/18 3 X week #/100ml 400 600 50 Weekly Geometric Mean No Action, BPJ
Broth,44.5 C Exceeded
10-2018 001 Effluent Coliform, Fecal MF, MFC 10/31/18 3 X week #/100ml 200 449.38 124.7 Monthly Geometric Mean No Action, BPJ
Broth,44.5 C Exceeded
11-2018 001 Effluent Coliform, Fecal MF, MFC 11/10/18 3 X week #/100ml 400 860.95 115.2 Weekly Geometric Mean No Action, BPJ
Broth,44.5 C Exceeded
11-2018 001 Effluent Coliform, Fecal MF, MFC 11/17/18 3 X week #/100ml 400 1,066.97 166.7 Weekly Geometric Mean No Action, BPJ
Broth,44.5 C Exceeded
11-2018 001 Effluent Coliform, Fecal MF, MFC 11/24/18 3 X week #/100ml 400 586.36 46.6 Weekly Geometric Mean No Action, BPJ
Broth,44.5 C Exceeded
11-2018 001 Effluent Coliform, Fecal MF, MFC 11/30/18 3 X week #/100ml 200 776.69 288.3 Monthly Geometric Mean No Action, BPJ
Broth,44.5 C Exceeded
12-2018 001 Effluent Coliform, Fecal MF, MFC 12/01/18 3 X week #/100ml 400 950.94 137.7 Weekly Geometric Mean No Action, BPJ
Broth,44.5 C Exceeded
01-2021 001 Effluent Flow,in conduit or thru 01/31/21 Continuous mgd 1.5 1.54 2.4 Monthly Average Proceed to NOV
treatment plant Exceeded
02-2021 001 Effluent Flow,in conduit or thru 02/28/21 Continuous mgd 1.5 1.83 21.9 Monthly Average Proceed to
treatment plant Exceeded Enforcement Case
10-2018 001 Effluent Nitrogen,Ammonia Total(as 10/31/18 3 X week mg/I 8 12.13 51.6 Monthly Average No Action, BPJ
N)-Concentration Exceeded
10-2018 001 Effluent Solids,Total Suspended- 10/13/18 3 X week mg/I 45 49.33 9.6 Weekly Average No Action, BPJ
Concentration Exceeded
10-2018 001 Effluent Solids,Total Suspended- 10/31/18 3 X week mg/I 30 33.02 10.1 Monthly Average No Action, BPJ
Concentration Exceeded
12-2020 001 Effluent Solids,Total Suspended- 12/05/20 3 X week mg/I 45 45.43 1.0 Weekly Average Proceed to
Concentration Exceeded Enforcement Case
12-2020 001 Effluent Solids,Total Suspended- 12/12/20 3 X week mg/I 45 62 37.8 Weekly Average Proceed to
Concentration Exceeded Enforcement Case
12-2020 001 Effluent Solids,Total Suspended- 12/19/20 3 X week mg/I 45 67 48.9 Weekly Average Proceed to
Concentration Exceeded Enforcement Case
12-2020 001 Effluent Solids,Total Suspended- 12/31/20 3 X week mg/I 30 39.46 31.5 Monthly Average Proceed to
Concentration Exceeded Enforcement Case

United States Environmental Protection Agency Form Approved.
EPA Washington,D.C.20460 OMB No.2040-0057
Water Compliance Inspection Report Approval expires 8-31-98
Section A: National Data System Coding (i.e., PCS)
Transaction Code NPDES yr/mo/day Inspection Type Inspector Fac Type
1 IN 1 2 u 3 I NCO030970 I11 121 22/12/08 I17 18I� I 19 I G I 201 I
211IIIII 111111III II III III1 I I IIIII IIIIIIIII II r6
Inspection Work Days Facility Self-Monitoring Evaluation Rating B1 QA ----------------------Reserved-------------------
67 70 J 71 Ity 72 L-J 73 1 74 79 I I I I 80
Section B: Facility Data
Name and Location of Facility Inspected(For Industrial Users discharging to POTW,also include Entry Time/Date Permit Effective Date
POTW name and NPDES permit Number) 10:00AM 22/12/08 17/09/01
Spring Lake WWTP
350 Harps St Exit Time/Date Permit Expiration Date
Spring Lake NC 28390 01:30PM 22/12/08 21/05/31
Name(s)of Onsite Representative(s)/Titles(s)/Phone and Fax Number(s) Other Facility Data
Richard E Mendez/ORC/910-497-5748/
Name,Address of Responsible Official/Title/Phone and Fax Number
Contacted
Richard Mendez,PO Box 617 Spring Lake NC 283900617//910-497-5748/9104362667
No
Section C:Areas Evaluated During Inspection (Check only those areas evaluated)
Permit 0 Flow Measurement Operations&Maintenar Records/Reports
Self-Monitoring Progran 0 Sludge Handling Dispo: Facility Site Review Compliance Schedules
Effluent/Receiving Wate 0 Laboratory
Section D: Summary of Finding/Comments(Attach additional sheets of narrative and checklists as necessary)
(See attachment summary)
Name(s)and Signature(s)of Inspector(s) Agency/Office/Phone and Fax Numbers Date
Sharon Moran DWR/FRO WQ/910-433-3300/
Stephanie Zorio DWR/FRO WQ/910-433-3322/
Signature of Management Q A Reviewer Agency/Office/Phone and Fax Numbers Date
Mark Brantley DWR/FRO WQ/910-433-3300 Ext.727/
EPA Form 3560-3(Rev 9-94)Previous editions are obsolete.
Page#

NPDES yr/mo/day Inspection Type (Cont.) 1
31 NCO030970 I11 12I 22/12/08 117 18 i c i
Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary)
Spring Lake is a 1.5 MGD wastewater treatment plant that discharges into the Little River in the Cape
Fear River Basin. During the inspection flow at the plant was approximately 750,000 GPD. At this time
the facility has been issued a draft permit from the Division and is operating under the previous
permit that expired in 2021. Back-up ORC Henry Taylor plans to retire by December 2023.
The WWTP was fully operational during the time of the inspection and running below capacity. The
acceptance station was recently refurbished with the installation of a new auger and control valve.
The WWTP was not receiving any additional waste because the sludge tank needs to be emptied. As
a result, the inspectors were informed that the acceptance station is not currently being used.
Significant upgrades to the plant are still pending and include new headworks, clarifier, sludge
stabilization equipment, and oxidation ditch. The auger of the grit chamber has been repaired since
the previous inspection. The grit chamber, along with the headworks, are included in the planned
plant upgrade.
Influent and effluent flow meters were calibrated on 11/9/2022 and is generally calibrated every 6
months. Both the influent and effluent composite samplers were fitted with fresh tubing. Both
refrigerated cabinets contained thermometers that measured -1❑C. All aerators were functioning
properly and foam covered -15% of the aeration basin. The aerator in the chlorination chamber was
running to increase oxygenation. Two out of three clarifiers were operational. One clarifier contained
-6 ft. of sludge. A sludge blanket was absent in the second clarifier. The sludge stabilization tank was
full to -6 ft. from the rim of the tank. Staff reported that Biogreen Services would arrive in the coming
weeks to collect sludge. Biogreen Services transports their sludge to a landfill.
The DMR reviewed (October 2021) during the inspection had a minor transcription error(flow on Oct.
4th)that will be amended. The annual compliance report was submitted on time. We note that Spring
Lake combines the collection system and wastewater treatment plant in their annual report. Please
keep a copy of the annual compliance report in records available for review. A generator testing log
was available for review. Staff informed the inspectors that the generator is automatically tested
under load every two weeks and is serviced twice a year. The Division suggests adopting the use of a
bound notebook for the ORC log. COC forms from Cameron Labs revealed discrepancies on the lab
employees portion. Please inform the lab that samples must be accepted and relinquished properly.
Page# 2

Permit: NCO030970 Owner-Facility: Spring Lake WWTP
Inspection Date: 12/08/2022 Inspection Type: Compliance Evaluation
Compliance Schedules Yes No NA NE
Is there a compliance schedule for this facility? ❑ ❑ ■ ❑
Is the facility compliant with the permit and conditions for the review period? ❑ ❑ ■ ❑
Comment:
Record Keeping Yes No NA NE
Are records kept and maintained as required by the permit? ■ ❑ ❑ ❑
Is all required information readily available, complete and current? ❑ ■ ❑ ❑
Are all records maintained for 3 years (lab. reg. required 5 years)? ■ ❑ ❑ ❑
Are analytical results consistent with data reported on DMRs? ❑ ■ ❑ ❑
Is the chain-of-custody complete? ❑ ■ ❑ ❑
Dates, times and location of sampling ■
Name of individual performing the sampling ❑
Results of analysis and calibration ■
Dates of analysis ■
Name of person performing analyses ■
Transported COCs ❑
Are DMRs complete: do they include all permit parameters? ■ ❑ ❑ ❑
Has the facility submitted its annual compliance report to users and DWQ? ■ ❑ ❑ ❑
(If the facility is = or> 5 MGD permitted flow) Do they operate 24/7 with a certified ❑ ❑ ■ ❑
operator on each shift?
Is the ORC visitation log available and current? ■ ❑ ❑ ❑
Is the ORC certified at grade equal to or higher than the facility classification? ■ ❑ ❑ ❑
Is the backup operator certified at one grade less or greater than the facility ■ ❑ ❑ ❑
classification?
Is a copy of the current NPDES permit available on site? ■ ❑ ❑ ❑
Facility has copy of previous year's Annual Report on file for review? ❑ ❑ ❑ ■
Comment: The DMR reviewed (October 2021) during the inspection had a minor transcription
error(flow on Oct. 4th) that will be amended.
Calibration sheets/sections of bench sheets should contain the name of the probe on
the relevant section.
The inspectors suggest adding a "Sampled By" column to bench sheets
COC forms from Cameron Labs revealed discrepancies on the lab employees portion.
Please inform the lab that samples. must be accepted and relinquished properly.
Permit Yes No NA NE
Page# 3

Permit: NCO030970 Owner-Facility: Spring Lake WWTP
Inspection Date: 12/08/2022 Inspection Type: Compliance Evaluation
Permit Yes No NA NE
(If the present permit expires in 6 months or less). Has the permittee submitted a new ❑ ❑ 0 ❑
application?
Is the facility as described in the permit? 0 ❑ ❑ ❑
#Are there any special conditions for the permit? ❑ 0 ❑ ❑
Is access to the plant site restricted to the general public? 0 ❑ ❑ ❑
Is the inspector granted access to all areas for inspection? 0 ❑ ❑ ❑
Comment:
Influent Sampling Yes No NA NE
# Is composite sampling flow proportional? ❑ 0 ❑ ❑
Is sample collected above side streams? 0 ❑ ❑ ❑
Is proper volume collected? 0 ❑ ❑ ❑
Is the tubing clean? 0 ❑ ❑ ❑
# Is proper temperature set for sample storage (kept at less than or equal to 6.0 0 ❑ ❑ ❑
degrees Celsius)?
Is sampling performed according to the permit? 0 ❑ ❑ ❑
Comment: Both the influent and effluent composite samplers were fitted with fresh tubing. Both
refrigerated cabinets contained thermometers that measured -0❑C.
Cmposite sampler for influent was time-based.
Grit Removal Yes No NA NE
Type of grit removal
a.Manual ❑
b.Mechanical
Is the grit free of excessive organic matter? 0 ❑ ❑ ❑
Is the grit free of excessive odor? 0 ❑ ❑ ❑
# Is disposal of grit in compliance? ■ ❑ ❑ ❑
Comment:
Bar Screens Yes No NA NE
Type of bar screen
a.Manual ❑
b.Mechanical
Are the bars adequately screening debris? 0 ❑ ❑ ❑
Page# 4

Permit: NCO030970 Owner-Facility: Spring Lake WWTP
Inspection Date: 12/08/2022 Inspection Type: Compliance Evaluation
Bar Screens Yes No NA NE
Is the screen free of excessive debris? 0 ❑ ❑ ❑
Is disposal of screening in compliance? 0 ❑ ❑ ❑
Is the unit in good condition? 0 ❑ ❑ ❑
Comment: Facility uses grinder and screw screens.
Flow Measurement - Influent Yes No NA NE
# Is flow meter used for reporting? 0 ❑ ❑ ❑
Is flow meter calibrated annually? M ❑ ❑ ❑
Is the flow meter operational? 0 ❑ ❑ ❑
(If units are separated) Does the chart recorder match the flow meter? ❑ ❑ 0 ❑
Comment: Influent and effluent flow meters were calibrated on 11/9/2022 and is generally
calibrated every 6 months.
Operations & Maintenance Yes No NA NE
Is the plant generally clean with acceptable housekeeping? 0 ❑ ❑ ❑
Does the facility analyze process control parameters, for ex: MLSS, MCRT, Settleable 0 ❑ ❑ ❑
Solids, pH, DO, Sludge Judge, and other that are applicable?
Comment: Process control parameters are also permit required parameters.
Secondary Clarifier Yes No NA NE
Is the clarifier free of black and odorous wastewater? 0 ❑ ❑ ❑
Is the site free of excessive buildup of solids in center well of circular clarifier? 0 ❑ ❑ ❑
Are weirs level? 0 ❑ ❑ ❑
Is the site free of weir blockage? 0 ❑ ❑ ❑
Is the site free of evidence of short-circuiting? ■ ❑ ❑ ❑
Is scum removal adequate? 0 ❑ ❑ ❑
Is the site free of excessive floating sludge? 0 ❑ ❑ ❑
Is the drive unit operational? 0 ❑ ❑ ❑
Is the return rate acceptable (low turbulence)? ■ ❑ ❑ ❑
Is the overflow clear of excessive solids/pin floc? 0 ❑ ❑ ❑
Is the sludge blanket level acceptable? (Approximately '/4 of the sidewall depth) ❑ ❑ ❑
Comment: 2 out of 3 were operational.
One clarifier contained -6 ft. of sludge. A sludge blanket was absent in the second
clarifier.
Page# 5

Permit: NCO030970 Owner-Facility: Spring Lake WWTP
Inspection Date: 12/08/2022 Inspection Type: Compliance Evaluation
Aeration Basins Yes No NA NE
Mode of operation Ext. Air
Type of aeration system Surface
Is the basin free of dead spots? ■ ❑ ❑ ❑
Are surface aerators and mixers operational? ■ ❑ ❑ ❑
Are the diffusers operational? ❑ ❑ 0 ❑
Is the foam the proper color for the treatment process? 0 ❑ ❑ ❑
Does the foam cover less than 25% of the basin's surface? 0 ❑ ❑ ❑
Is the DO level acceptable? ❑ ❑ ❑
Is the DO level acceptable?(1.0 to 3.0 mg/1) ❑ ❑ ❑
Comment: DO levels were compliant via DMRs.
All aerators were functioning properly and foam covered -15% of the aeration basin.
Aerobic Digester Yes No NA NE
Is the capacity adequate? 0 ❑ ❑ ❑
Is the mixing adequate? 0 ❑ ❑ ❑
Is the site free of excessive foaming in the tank? ■ ❑ ❑ ❑
# Is the odor acceptable? 0 ❑ ❑ ❑
# Is tankage available for properly waste sludge? 0 ❑ ❑ ❑
Comment: The sludge stabilization tank was full to -6 ft. from the rim of the tank. Staff reported
that Biogreen Services would arrive in the coming weeks to collect sludge.
Solids Handling Equipment Yes No NA NE
Is the equipment operational? ❑ ❑ 0 ❑
Is the chemical feed equipment operational? ❑ ❑ ■ ❑
Is storage adequate? ❑ ❑ 0 ❑
Is the site free of high level of solids in filtrate from filter presses or vacuum filters? ❑ ❑ 0 ❑
Is the site free of sludge buildup on belts and/or rollers of filter press? ❑ ❑ 0 ❑
Is the site free of excessive moisture in belt filter press sludge cake? ❑ ❑ ■ ❑
The facility has an approved sludge management plan? ❑ ❑ 0 ❑
Comment:
Drying Beds Yes No NA NE
Is there adequate drying bed space? ❑ ❑ 0 ❑
Is the sludge distribution on drying beds appropriate? ❑ ❑ 0 ❑
Page# 6

Permit: NCO030970 Owner-Facility: Spring Lake WWTP
Inspection Date: 12/08/2022 Inspection Type: Compliance Evaluation
Drying Beds Yes No NA NE
Are the drying beds free of vegetation? ❑ ❑ 0 ❑
# Is the site free of dry sludge remaining in beds? ❑ ❑ ■ ❑
Is the site free of stockpiled sludge? ❑ ❑ 0 ❑
Is the filtrate from sludge drying beds returned to the front of the plant? ❑ ❑ 0 ❑
# Is the sludge disposed of through county landfill? ❑ ❑ 0 ❑
# Is the sludge land applied? ❑ ❑ ■ ❑
(Vacuum filters) Is polymer mixing adequate? ❑ ❑ 0 ❑
Comment:
Disinfection-Liquid Yes No NA NE
Is there adequate reserve supply of disinfectant? 0 ❑ ❑ ❑
(Sodium Hypochlorite) Is pump feed system operational? 0 ❑ ❑ ❑
Is bulk storage tank containment area adequate? (free of leaks/open drains) M ❑ ❑ ❑
Is the level of chlorine residual acceptable? ❑ ❑ ❑
Is the contact chamber free of growth, or sludge buildup? ■ ❑ ❑ ❑
Is there chlorine residual prior to de-chlorination? 0 ❑ ❑ ❑
Comment: Chlorine residual levels were compliant via DMRs.
Effluent Sampling Yes No NA NE
Is composite sampling flow proportional? 0 ❑ ❑ ❑
Is sample collected below all treatment units? 0 ❑ ❑ ❑
Is proper volume collected? ■ ❑ ❑ ❑
Is the tubing clean? ■ ❑ ❑ ❑
# Is proper temperature set for sample storage (kept at less than or equal to 6.0 0 ❑ ❑ ❑
degrees Celsius)?
Is the facility sampling performed as required by the permit (frequency, sampling type 0 ❑ ❑ ❑
representative)?
Comment: Both the influent and effluent composite samplers were fitted with fresh tubing. Both
refrigerated cabinets contained thermometers that measured -00C.
Flow Measurement - Effluent Yes No NA NE
# Is flow meter used for reporting? 0 ❑ ❑ ❑
Is flow meter calibrated annually? M ❑ ❑ ❑
Is the flow meter operational? ❑ ❑ ❑
Page# 7

Permit: NCO030970 Owner-Facility: Spring Lake WWTP
Inspection Date: 12/08/2022 Inspection Type: Compliance Evaluation
Flow Measurement - Effluent Yes No NA NE
(If units are separated) Does the chart recorder match the flow meter? ❑ ❑ ❑
Comment: Influent and effluent flow meters were calibrated on 11/9/2022 and is generally
calibrated every 6 months.
Upstream / Downstream Sampling Yes No NA NE
Is the facility sampling performed as required by the permit (frequency, sampling type, 0 ❑ ❑ ❑
and sampling location)?
Comment: Facility is a member of the Middle Cape Fear River Basin Association. Upstream and
downstream monitoring requirements are waived as long as the facility is a member of
the association.
Page# 8

Whole Effluent Toxicity Testing and Self Monitoring Summary
Southern Pines WTP(NCG590018/NC00 NCO049778/001 County: Moore Region: FRO Basin: LUM50 Jan Apr Jul Oct SOC JOC:
Ceri7dPF Begin: 7/1/2017 ANNUAL:Chr Monit: NonComp: 7Q10: PF: 0.48 IWC: Freq: A
J F M A M J J A S O N D
2019 - - Pass - - - - - - - - -
2020 Pass - - - - - - - - - - -
2021 Pass - - - - - - - - - - -
2022 Pass - - - - - - - - - - -
2023 Pass - - - - - - - - - - -
Southern States Coop./S.S.Fertilizer NCO082821/001 County: Iredell Region: MRO Basin: YAD06 Feb May Aug Nov SOC JOC:
Ceri7dPF Begin: 5/1/2014 chr lim:3% NonComp: Single 70,10: 7.5 PF: 0.144 IWC: 2.89 Freq: Q
J F M A M J J A S O N D
2019 >9 >9 - - >9 - - >9 Invalid Pass - >9 -
2020 - >9 - - >9 - - >9 - - >9 -
2021 - Invalid >9 - >9 - - >9 - - >9 -
2022 - >9 - - INVALID INVALID>9 - >9.0 - - >9 -
Sparks Road WTP-Davie County NCO084212/001 County: Davie Region: WSRO Basin: YAD02 Feb May Aug Nov SOC JOC:
Ceri7dPF Begin: 8/1/2014 Chr Monit: 90% NonComp: 7Q10: PF: 0.023 IWC: Freq: Q
J F M A M J J A S O N D
2019 - Pass - - Pass - - Pass - - Pass -
2020 - Pass - - Pass - - Pass - - Pass -
2021 - INVALID Pass - Pass - - Pass - - Pass -
2022 - Fail - - Pass - - Pass - - Fail -
Sparta WWTP NCO026913/001 County: Alleghany Region: WSRO Basin: NEW03 Mar Jun Sep Dec SOC JOC:
Ceri7dPF Begin: 6/1/2013 chr lim:9% NonComp: Single 70,10: 18.0 PF: 0.60 IWC: 9.0 Freq: Q
J F M A M J J A S O N D
2019 - - Pass - - Pass - - Pass - - Fail
2020 >18 >18 Pass - - Pass - - Pass - - Pass
2021 - - Pass - - Pass - - Pass - - Pass
2022 - - Pass - - Pass - - Pass - - Pass
Spindale WWTP NCO020664/001 County: Rutherford Region: ARO Basin: BRD02 Mar Jun Sep Dec SOC JOC:
Ceri7dPF Begin: 11/1/2013 Chr lim:19%(3 tier)( NonComp: SINGLE 7Q10: 20 PF: 3.0 IWC: 19 Freq: Q
J F M A M J J A S O N D
2019 - - Pass - - Pass - - Pass - - Pass
2020 - - Pass - - Pass - - Pass - - Pass
2021 - - Pass - - Pass - - Pass - - Pass
2022 - - Pass - - Pass - - Pass - - Pass
Spring Lake WWTP NCO030970/001 County: Cumberland Region: FRO Basin: CPF14 Feb May Aug Nov SOC JOC:
Ceri7dPF Begin: 9/1/2017 chr lim:5.5% NonComp: Single 7Q10: 40.0 PF: 1.5 IWC: 5.5 Freq: Q
J F M A M I J A S O N D
2019 - Pass - - >22(P)Pass - - Pass - - Pass -
2020 - Pass - - Pass - - Pass>22(P) - - Pass -
2021 - Pass - - Pass - - Pass - - Pass -
2022 - Pass - - Pass - - Pass - - Pass -
Leeend: P=Fathead minnow(Pimohales Dromelas).H=No Flow(facility is active).s=SDlit test between Certified Labs Page 91 of 106

EPA Identification Number NPDES Number Facility Name Outfall Number
110006367387 NCO030970 Spring Lake WWTP 001
Method Number Estimated Concentration (If
Pollutant(Required) CAS number (if Applicable) Reason Pollutant Believed Present in Discharge Known)
No additional parameter were
sampled or monitored.
ORC
Richard endez
z g sp23

Effluent Toxicity Report Form-Chronic Fathead Minnow Multi-Concentration Test Date:2/22/2018
Facility: Spring Lake NPDES#NC00 30970 Pipe#: 001 County: Cumberland
Labor ry: Merit ch, Inc. Comments
x
Signature of-0pee tor it))Res sible C e
x
Signature of Laboratory Supervisor
MAIL ORIGINAL TO. Water Sciences Section
Aquatic Toxicology Branch
Division of Water Resources
1621 Mail Service Center
Raleigh,NC 27699-1621
Test Initiation Date/Time 2/13/2018 4:48 PM Avg WUSurv.Control 0.879 Test Organisms
%Elf. Repl. 1 2 3 4 T_ Cultured In-House
Fc-o-n-tro-T1 Surviving# 10 10 10 10 %Survival _10-00---j Outside Supplier
Original# 10 10 10 '10
Wt/original(mg) 0.905 0.865 0.823 0.921 Avg Wt(mg) 0.879 Hatch Date: 2/12118
1.38 Surviving# 10 10 9 10 %Survival 97.5 Hatch Time: 3:00 pm CT
Original# 10 10 10 10
Wt/original(mg) 0.893 0.942 0.834 0.748 Avg Wt(mg),F 0.854
F-2.-75--1 Surviving# 10 10 10 10 %Survival 100.0
Original# 10 10 10 10
Wt/original(rng) 0.851 0.799 1,089 0.788 Avg Wt(mg) 0.882
F__5_5__j Surviving# 10 10 10 10 %Survival 100.0
Original# 10 10 10 10
Wt/original(rng) 1.098 0.933 0.999 0.953 Avg Wt(mg) 0.996
77
11 Surviving# 10 10 10 10 %Survival 100.0
Original# 10 10 10 10
Wt/original(mg) 0.954 0.864 0.832 0.993 Avg Wt(mg) 0.911
F__22__1 Surviving# 10 10 10 10 %Survival 100.0
Original# 10 10 10 10
Wtloriginal(mg) 0.827 0.870 0.941 0.948 Avg Wt(mg) 0.897
Water Quality Data Day
Control 0 1 2 3 4 5 6
pH(SU)Init/Fin 8.00 / T85 8.11 / 8.00 8.12 / 7.72 8.23 1 8.12 8.21 , 8.13 1 8.28 i 7.86 8.20 1 8.02
DO(mg/L) Init/Fin 7.93 / 6.81 7.64 / 6.96 7.61 1 5,78 7.22 1 7.68 7.88 1 7.61 8.01 / 6.84 7.54 1'7.37
Temp(C)Init/Fin 24.9 / 25.8 24.6 / 25.4 25.8 / 25.6 25.4 / 25.5 25.0 1 24.9 24.6 1 25.3 24.7 1 25.9
High Concentration 0 1 2 3 4 5 6
pH(SU)Init/Fin 7.69 17.90 7.84 / 7.93 7.92 1 7.74 8.00 / 8.02 8.10 18.26 8.24 / 7.89 8.05 / 8.48
DO(mg/L) Init/Fin 7.88 1 6.76 7.84 / 6.90 7.65 1 5.91 T20 / 7.51 7.78 1 7.79 7.89 1 6.90 7.56 / 8.10
Temp(C)Init/Fin 24.7 / 24.7 25.1 / 25.0 25.6 1 24.9 25.8 1 25.8 25.9 / 25.3 25.3 / 25.6 25.6 / 25.9
Sample 1 2 3 Survival Growth Overall Result
Collection Start Date 2/12/2018 2/14/2018 2/15/2018 Normal F1 F1 ChV >22
Grab Hom.Vac rri rI
Composite(Duration) 24.1 24.0 24.1 NOEC 22 22
Hardness(mg/L) 36 38 40 LOEC >22 >22
Alkalinity(mg/L) 46 46 52 ChV >22 >22
Conductivity(umhos/cm) 412 378 384 Method Steel's Dunnett's
Chlorine(mg/L) <0.1 <0.1 <0.1
Temp.at Receipt(°C) 1.7 1.7 0.8 Stats Survival Growth
Conc. Critical Calculated Critical Calculated
Dilution H2O Batch# A42
1243 1244 1245 1.38 10 16 2.41 0.4041
Hardness(mg/L) 44 46 [�E
2.75 10 18 2.41 -0.0542
Alkalinity(mg/L) 58 54 55 10 18 2.41 -1.9540
Conductivity(umhos/cm) 216 208 11 10 18 2.41 -0.5374
22 10 18 2.41 -0.3000
n1A/n C-- AT C/f//)41

Effluent Toxicity Report Form-Chronic Fathead Minnow Multi-Concentration Test Date:10/3/2018
Facility: Spring Lake WWTP NPDES#NC00 30970 Pipe#: 001 County: Cumberland
Laboratory eritech, Inc. Comments
x
Signature of Operator in 13�spor,sib Charge second copy
x ✓ -
Signature of Laboratory Supervisor
A1AIL ORIGINAL TO: Water Sciences Section
Aquatic'I'oxicology Branch
Division of Water Resources
1621 Mail Service Center
Raleigh,NC 27699-1621
Test Initiation Date/Time 8/21/2018 3:54 PM Avg Wt/Surv. Controf 0.699 Test Organisms
%Eff. Repl. 1 2 3 4 Cultured In-House
KE-ir-oil Surviving# 10 10 10 10 %survivall 100.07 I✓ Outside Supplier
Original# 10 10 10 10
Wt/original(mg) 0.651 0.650 0.713 0.783 Avg Wt(mg) 0.699 Hatch Date: 8120/18
1.38 Surviving# 10 10 10 10 %Survival 100.0 Hatch Time: 3:00 pm CT
Original# 10 10 10 10
Wt/original(mg) 0.604 0.658 0.599 0.647 Avg Wt(mg) 0.627
2.75 Surviving# 10 10 10 10 %Survival 100.0
Original# 10 10 10 10
Wt/original(}ng) 0.817 0.757 0.813 0.711 Avg Wt(mg) 0.775
5.5 Surviving# 10 10 10 10 %Survival 100.0
Original# 10 10 10 10
Wt/original(mg) 0.634 0.708 0.745 0.745 Avg Wt(mg)F 0.708
117 Surviving# 10 10 10 10 %Survival 100.0
Original# 10 10 10 10
Wt/original(mg) 0.705 0.755 0.753 0.720 Avg Wt(mg) 0.733
F-22--1 Surviving# 10 10 10 10 %Survivall 100.0
Original# 10 10 10 10
Wt/original(mg) 0.681 0.746 0.684 0.763 Avg Wt(mg) 0.719
-11
Water Quality Data Day
Control 0 1 2 3 •1 5 6
pH(SU)[nit/Fin 8.13 t 7.89 8.16 i 7.89 8.02 1 7.87 8.11 1 8.10 8.24 i 7.85 8.25 17,95 8.14 / 7.69
00(mg/L) Init/Fin 7.86 1 7.18 7.74 / 7.42 7.91 / 6.92 7.99 i 7.45 7.94 / 7.38 8,22 / 7.27 8.14 16.74
Temp(C)Init/Fin 24.3 / 24.8 25.4 I 24.1 24.2 / 24.0 24.3 r 24.1 24.6 / 24.3 1 25.1 l 24.3
High Concentration 0 1 2 3 4 5 6
pH(SU)Init/Fin 7.82 t 7.88 7.79 1 7.82 7.82 1 7.88 7.89 1 8.11 8.20 / 7.82 8.04 / 7.90 8.05 / 7.62
DO(mg/L) Init/Fin 7.75 t 7.35 7.85 r 7.23 7.78 17.28 8.04 1 7A5 7.83 / 7.21 8.11 / 7.16 7.80 1 6.49
Temp(C)Init/Fin 25.3 / 24.1 25.0 / 24.3 25.0 / 25.1 25.5 t 24.2 24.6 / 24.7 24.8 / 24.5 24.5 / 24.7
Sample 1 2 3 Survival Growth Overall Result
Collection Start Date 8/20/2018 8/22/2018 8123/2018 Normal F1 ChV 1 >22
Grab _ Hom.Var. F( FYI
Composite(Duration) 24.2 24.1 24.1 NOEC 22 22
Hardness(mg1Q 36 36 36 LOEC >22 >22
Alkalinity(mg/L) 37 41 44 ChV >22 >22
Conductivity(umhos/cm) 337 1 353 1 320 Method Steel's Dunnett's
Chlorine(mg/L) <0.1 <0.1 <0.1
Temp.at Receipt('C) L 1.6 1.7 1.6 Stats Survival Growth
Conc. Critical Calculated Critical Calculated
Dilution H2O Batch# 1299 1300 1301 1.38 10 18 2.41 2.2344
Hardness(mg/L) 1 44 1 44 44 2.75 10 18 2.41 -2.3271
Alkalinity(mg/L) r531 55 54 5.5 10 18 2.41 -0.2706
Conductivity(umhos/cm) r,98 183 189 11 10 18 2.41 -1.0515
22 10 18 2.41 -0.5953
r1t•// �-..� nT C/I//1.r1

Effluent Toxicity Report Form-Chronic Fathead Minnow Multi-Concentration Test Date:5/23/2019
Facility: Spring Lake NPDES#NC00 30970 Pipe#: 001 County: Cumberland
Laboratory: Meritech,Inc. Comments
x
Signature of Operator in Res ibl urge
--2
xJ
Signature of Laboratory Supervisor
NIA11,ORIGINAL TO: Rater Sciences Section
Aquatic Toxicology Branch
Division of Rater Resources
1621 Mail Service Center
Raleigh,NC 27699-1621
est Initiation Date/Time 5/14/2019 4:22 PM Avg WUSurv, Controf 0.691 Test Organisms
%Eff. Repl. 1 2 3 4 r Cultured In-House
Control Surviving# 9 10 10 10 %Survival 97.5 (y Outside Supplier
Original# 10 10 10 10
WUoriginal(mg) 0.622 0.812 0.582 0.678 Avg Wt(mg) 0.674 Hatch date: 5l13l19
F--1-3-8-1 Surviving# 10 10 9 10 %Survival 97.5 Hatch Time: 3:00 pm CT
Original# 10 10 10 10
WUoriginal(mg) [::: 0.578 0.706 0.622 0.669 Avg Wt(mg) 0.644
2_7571 Surviving# 10 10 10 9 %Survivall 97.5
Original# 10 10 10 10
WUoriginal(mg) 0.625 0.589 0.652 0.505 Avg Wt(mg) 0.593
5.5 Surviving# 10 10 1 10 10 %Survival 100.0
Original# 10 10 10 10
Wt/original(mg) 0.605 0.682 0.619 0.603 Avg Wt(mg) 0.627
7_1 _1 Surviving# 9 10 9 10 %Survival 95.0
Original# 10 10 10 10
Wt/original(mg) 0.617 0.524 0.562 0.597 Avg Wt(mg} 0.575
F-2--2 -1 Surviving# 9 9 1 10 1 8 %SurvivalF 90.0
Original# 10 10 1 10 10
Wt/original(mg) 0.641 0.637 1 0.647 0.483 Avg Wt(mg)1 0.602
Nater Quality Data Day
Control 0 1 2 3 4 5 6
pH(SU)Init/Fin 8.10 / 7.85 8.17 / 7.84 8.02 17.86 8.17 18.08 8.23 / 8.02 8.24 / 7.99 8.22 1 7,77
DO(mg/L) Init/Fin 7.88 1 7.04 7.45 / 7.08 8.00 / 6.67 7.60 / 7.35 7.68 / 7.52 7.70 / 7.30 7.74 / 6.87
Temp(C)Init/Fin 24.5 / 24.4 25.0 / 25.2 24.8 1 24.9 24.7 / 24.9 24.3 / 24.1 24.1 / 24.1 24,0 1 24.5
High Concentration 0 1 2 3 4 5 6
pH(SU)IniUFin 7.91 1 7.87 8.19 / 7.85 7.76 17.78 7.96 ! 8.17 8.20 / 7.86 8.12 1 7.98 7.99 1 7.73
DO(mg/L) Init/Fin 7.67 1 6.94 7.47 / 7.04 7.69 1 6.61 7.57 / 7,30 7.36 / 7.40 7.58 17.40 7.69 / 7.16
Temp(C)Init/Fin 24.0 / 24.6 24.9 1 24.9 25.1 / 24.8 25.1 124.9 24.8 124.7 1 24.6 / 24.0 24.0 1 24.6
Sample 1 2 3 Survival Growth Overall Result
Collection Start Date 5/13/2019 5/15/2019 5i16/2019 Normal F'I FI ChV 722
Grab Hom.Var. Fl rl
Composite(Duration) 24.1 24.0 23.9 NOEC 22 22
Hardness(mg/L) 30 26 26 LOEC >22 >22
Alkalinity(mg/L) 30 31 29 ChV >22 >22
conductivity(umhoslcm) 1 338 1 335 1 341 Method Steel's Dunnett's
Chlorine(mg/L) <0.1 <0.1 <0.1
Temp.at Receipt(°C) 2.0 2.3 0.9 Stats Survival Growth
Conc. Critical Calculated Critical Calculated
Dilution H2O Batch# 1397 1398 1399 1400 1.38 10 18 2.41 0.6315
Hardness(mg/L) I 44 1 44 144 2.75 10 18 2.41 1.7140
Alkalinity(mg/L) 53 57 55 54 5.5 10 20 2.41 0.9817
conductivity(umhos/cm) 191 212 197 203 11 10 16 2.41 2.0908
22 10 13.5 2.41 1.5177

Effluent Toxicity Report Form-Chronic Fathead Minnow Multi-Concentration Test Date:8/20/2020
Facility: Spring La NPDES#NC00 30970 Pipe#: 001 County: Cumberland
Laboratory: ME ech,Inc. Comments
x
Signature of Operat r in Respon ' le harge -,
x L ` .�-
Signature of Labora ory Supervisor
MAIL ORIGINAL TO: Water Sciences Section
Aquatic Toxicology Branch
Division of Water Resources
1621 Mail Service Center
Raleigh,NC 27699-1621
Test Initiation Date/Ti 8/11/2020 3:56 PM Avg WUSurv.Control 0.709 Test Organisms
%Eff. Re 31. 1 2 3 4 r Cultured In-House
Control Surviving 10 10 9 9 %Survival 95.0 r% Outside Supplier
Original 10 10 10 10
Wt/original(m ) 0.776 0.650 0.649 0.620 Avg Wt(mg) 0.674 Hatch Date: 8/70/20
F-1-38--1 Surviving 10 10 9 10 %Survivall 97.5 Hatch Time: 3:00 pm CT
Original t 10 10 10 10
Wt/original(m ) 0.671 0.817 0.824 0.659 Avg Wt(mg) 0.743
F-2-7-5-1 Surviving 10 9 10 10 %Survival 97.5
Original 10 10 10 10
Wt/original(m ) 0.715 0.621 0.712 0.747 Avg Wt(mg) 0.699
F_5_5___1 Surviving 10 10 10 10 %Survival 100.0
Original 10 10 10 10
WUoriginal(m ) 0.726 0.668 0.868 0.708 Avg Wt(mg) 0.743
11 Surviving 9 10 10 10 %Survival 97.5
Original 10 10 10 10
Wt/original(m ) 0.685 0.743 0.669 0.755 Avg Wt(mg) 0.713
22 Surviving t 10 10 10 10 %Survival 100.0
Original 10 10 10 10
Wt/original(m ) 0.900 0.716 0.718 0.770 Avg Wt(mg) 0.776
Water Quality Data Day
Contr 1 0 1 2 3 4 5 6
pH(SU)IniUF 1 7.68 / 7.63 7.55 / 7.74 7.77 1 7.52 7,88 / 7.58 7.71 / 7.52 7.86 / 7.64 7.89 / 7.38
DO(mg/L) IniUF 1 7.7 11 7.45 7.72 / 7.76 7.69 / 7.01 7.65 1 7.07 7.79 / 6.82 7.76 / 7.29 7.64 / 6.44
Temp(C)Init/F 1 24.6 / 24.2 24.2 / 24.0 24.8 / 24.7 24.8 / 24.7 24.1 / 24.8 24.3 1 24.7 24.3 / 24.3
High Concentratio 1 0 1 2 3 4 5 6
pH(SU)Init/F 7.54 / 7.62 7.65 / 7.66 7.51 / 7.46 7.69 / 7.39 7.58 / 7.51 7.73 / 7.67 7.67 / 7.37
DO(mg/L) IniUFi 1 17.84 / 7.48 7.74 1 7.47 7.55 / 6.71 7.65 / 6.46 7.62 / 6.66 7.68 / 7.11 7.61 1 6.29
Temp(C)Init/Fi i 24.8 1 24.1 24.3 1 24.3 25.1 1 24.1 124.9 / 24.1 25.2 1 24.7 24.4 1 24.2 25.3 1 24.8
Sampl 1 2 3 Survival Growth Overall Result
Collection Start Da 8/10/2020 8/12/2020 8/13/2020 Normal r( F) ChV >22
Gra _ Hom.Var. Fl FI
Composite(Duratio 24.1 24.0 24.1 NOEC 22 22
Hardness(mg! 36 34 32 LOEC >22 >22
Alkalinity(mg! 23 28 32 ChV >22 >22
Conductivity(umhos/crr 352 354 355 Method Steel's Dunnett's
Chlorine(mg/ <0.1 <0.1 <0.1
Temp.at Receipt{ ) 1.7 2.0 2.2 Stats Survival Growth
Conc. Critical Calculated Critical Calculated
Dilution H2O Batch f 1497 1498 1.38 10 20 2.41 -1.3216
Hardness(mg/l.1
44 44 2.75 10 20 2.41 -0.4788
Alkalinity(mg/ 31 31 5.5 10 22 2.41 -1.3168
Conductivity(umhos/c 157 163 11 10 20 2.41 -0.7518
22 10 22 2.41 -1.9584