NC0020737_Fact Sheet_20200102

Fact Sheet
NPDES Permit No. NCOO2O737
Permit Writer/Email Contact: Bing Bai / Contact Cassidy Kurtz, [e-mail]
Date: January 2, 2020
Division/Branch: NC Division of Water Resources/NPDES Complex Permitting
Fact Sheet Template: Version 09Jan2017
Permitting Action:
❑N 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:
City of Kings Mountain/Pilot Creek WWTP
Applicant Address:
PO Box 429, Kings Mountain, NC 28086
Facility Address:
200 Potts Creek Road, Kings Mountain, NC 28086
Permitted Flow:
6.0 MGD
Facility Type/Waste:
MAJOR Municipal; 99% domestic, 1% industrial
Facility Class:
Class 4
Treatment Units:
Bar Screen, Activated Sludge/Aeration, Clarification, Chlorine
Disinfection, Aerobic Digestion, Sludge Dewatering
Pretreatment Program (Y/N)
Yes
County:
Cleveland
Region
Mooresville
Briefly describe the proposed permitting action and facility background: The City of Kings Mountain
has applied for an NPDES permit renewal at 6.0 MGD and the addition of tiered flow pages for 2.0, 3.0,
4.0 and 5.0 MGD for the Pilot Creek WWTP in March 2018. This facility serves a population of 13,500
Page 1 of 11

residents, and operates a pretreatment program with 6 Significant Industrial users (SIUs). The receiving
stream was classified as C waters, and is not listed in the 303(d) list for impaired waterbody.
In the 2015 permit renewal, limits for thallium (1.43 µg/L monthly average and daily max) was included
in the permit due to high thallium concentrations in the effluent from Pilot Creek WWTP. a Special Order
of Consent (SOC) for total thallium (60.1 µg/L monthly average) was issued in July, 2016 and renewed in
March 2018. This SOC will expire on August 31, 2020. Because the state of North Carolina does not have
water quality criteria for thallium, in the 2015 permit renewal, the EPA recommended criteria of 0.47
µg/L was used for the calculation of thallium limit. In 2018, the NC Division of Water resources (DWR)
conducted an assessment of thallium criteria and recommend surface water criteria for thallium as 2 µg/L
in all surface waters of the state. In this permit renewal, thallium limits will be recalculated based on the
updated criteria value of 2 µg/L.
The permittee requested for addition of tiered flow pages for 2.0, 3.0, 4.0 and 5.0 MGD. The Division
will only issue tiered flow pages of 3.0, 4.0 and 6.0 MGD for this permit.
2. Receiving Waterbody Information:
Receiving Waterbody Information
Outfalls/Receiving Stream(s):
Outfall 001 — Buffalo Creek
Stream Segment:
9-53-(5)
Stream Classification:
C
Drainage Area (mi2):
116
Summer 7Q 10 (cfs)
19
Winter 7Q 10 (cfs):
42
30Q2 (cfs):
54
Average Flow (cfs):
162
IWC (% effluent):
33% at 6.0 MGD
303(d) listed/parameter:
No
Subject to TMDL/parameter:
Yes- State wide Mercury TMDL implementation.
Basin/Sub-basin/HUC:
Broad River Basin / 03-08-05 / 03050105
USGS Topo Quad:
F 13 SW
Page 2 of 11

3. Effluent Data Summary
Effluent data for Outfall 001 is summarized below for the period of June 2015 through January 2019.
Table 3. Effluent Data Summary Outfall 001
Parameter
Units
Average
Max
Min
Permit Limit
Flow
MGD
1.728
6.664
0.967
MA 6.0
MA 28.0
BOD summer
mg/l
2.47
14.9
< 2
WA 42.0
MA 30.0
BOD winter
mg/l
2.3
9.6
< 2
WA 45.0
MA 2.6
NH3N summer
mg/l
0.76
16
< 0.1
WA 7.8
NH3N winter
mg/l
0.14
2.47
< 0.1
MA 8.9
WA 26.7
MA 30.0
TSS
mg/l
6.9
300
< 1
WA 45.0
pH
SU
6.8
7.7
6.0
6.0 - 9.0
Fecal coliform
MA 200
#/100 ml
7.5
60,000
< 1
(Geomean)
WA 400
DO
mg/l
8.2
12.6
5.9
DA > 5
TRC
µg/1
18.7
41
11
DM 28
Temperature
° C
20.2
31.1
6
Monitor only
TN
mg/l
26
39
15
Monitor only
TP
mg/l
3.6
5.3
1.4
Monitor only
MA 152.2
Total Arsenic
µg/l
85.6
202
< 5
DM 184.2
MA 15
Total Cyanide
µg/1
< 8.6
13
< g
DM 59.1
Chlorides
mg/1
292.8
1,400
129
Monitor only
Total Copper
µg/l
6.9
< 25
1.7
MA/DM 19.6
Total Zinc
µg/l
41.6
83
< 5
MA/DM 152.2
MA 1.43
Total Thallium
µg/l
25.4
318
0.79
DM 1.43
SOC MA 60.1
Total Mercury
ng/l
3.3
< 200
0.8
AA 36.5
MA -Monthly Average, WA -Weekly Average, DM -Daily Maximum, DA=Daily Average, AA -Annual Average
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).
Page 3 of 11

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, temperature and
conductivity. Review of instream data for the past three years indicates that there were no apparent
differences between upstream and downstream for temperature and DO (ANOVA, p > 0.05). There was
one occasion when downstream temperature was 5.9 °C higher than upstream, but was not likely caused
by the discharge of this facility as the effluent temperature was 0.4 °C higher than upstream temperature.
The DO standard of 5 mg/l was maintained all the time except for one event on March 15, 2016 when
downstream DO was 3.8 mg/l, while the DO concentration in this facility's discharge on the same day
was 8.3 mg/l. Statistical difference was observed for upstream and downstream conductivity, with
downstream conductivity significantly higher than upstream (ANOVA, p < 0.05). Instream monitoring
results are summarized in Table 4 and 5. This draft permit maintains the same instream monitoring
requirements.
Table 4. Upstream Samples
Temp
DO
Conductivity
°C
mg/L
µmhos/cm
Average
20.7
8.4
61.6
Max
29.7
18.6
398
Min
5
5.3
6.1
Table 5. Downstream Samples
Temp
DO
Conductivity
°C
mg/L
µmhos/cm
Average
19.1
8.6
201.7
Max
32.2
15.1
558
Min
2
3.8
48.5
Is this facility a member of a Monitoring Coalition with waived instream monitoring (YIN): NO
Name of Monitoring Coalition: NA
5. Compliance Summary
Summarize the compliance record with permit effluent limits (past 5 years): The facility reported 5 limit
violations for total arsenic, 6 limit violations for ammonia nitrogen, 1 limit violation for total thallium
during last permit cycle (June 2015 through January 2019), with all violations proceeded to NOV or
enforcement cases. This facility also reported 28 limit violations for TRC, since all reported values were
less than 50 µg/L and the Division considered all TRC values less than 50 to be in compliance, no action
was taken for these TRC violations. This facility discharges high concentration of total thallium, and has
been under a special order of consent for total Thallium since July 2016, which relaxed their limit to 60.1
µg/L for monthly average. The SOC expired on May 2018, and was renewed in March 2018 with
extended expiration date of August 31, 2020.
Page 4 of 11

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, as well as all 5 second species
chronic toxicity tests.
Summarize the results from the most recent compliance inspection: The last facility inspection conducted
in April 2017 reported that the facility was well maintained and operated, but had issues in record keeping
and reporting that caused this facility not being compliant.
6. Water Quality -Based Effluent Limitations (WQBELs)
Dilution and Mixing
In accordance with 15A NCAC 2B.0206, the following streamflows are used for dilution considerations
for development of WQBELs: 1 Q 10 streamflow (acute Aquatic Life); 7Q 10 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/1 for Municipals) may be appropriate if deemed more stringent based on dilution and
model results.
Ifpermit limits are more stringent than TBELs, describe how limits were developed: Limitations for
summer BOD are based on a Streeter Phelps model (Level B) conducted in 1989 for instream DO
protection. Limitations for winter BOD are based on Secondary Treatment Standard defined in 40 CFR
133.102. 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/l (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: There are no
proposed changes.
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
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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 detection limit for "less than" values; and 4) streamflows used for dilution
consideration based on 15A NCAC 2B.0206. Effective April 6, 2016, NC began implementation of
dissolved metals criteria in the RPA process in accordance with guidance titled NPDES Implementation of
Instream Dissolved Metals Standards, dated June 10, 2016.
A reasonable potential analysis was conducted on effluent toxicant data collected between May 2015 and
October 2018. 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:
Molybdenum, Selenium, Thallium for all effluent pages;
Arsenic for 6.0 MGD effluent pages;
• 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:
Arsenic for 3.0 and 4.0 MGD effluent pages;
Cyanide for all effluent pages;
Chlorides for 6.0 MGD effluent pages;
• 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: Beryllium, Cadmium, Total Phenolic Compounds, Chromium, Copper, Lead,
Nickel, Silver, Zinc, Chloroform, Dichlorobromomethane, Bromoform.
• 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: NA
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:
If applicable, attach a spreadsheet of the RPA results as well as a copy of the Dissolved Metals
Implementation Fact Sheet for freshwater/saltwater to this Fact Sheet. Include a printout of the RPA
Dissolved to Total Metal Calculator sheet if this is a Municipality with a Pretreatment Program.
Toxicity Testing Limitations
Permit limits and monitoring requirements for Whole Effluent Toxicity (WET) have been established in
accordance with Division guidance (per WET Memo, 8/2/1999). Per WET guidance, all NPDES permits
issued to Major facilities or any facility discharging "complex" wastewater (contains anything other than
domestic waste) will contain appropriate WET limits and monitoring requirements, with several
exceptions. The State has received prior EPA approval to use an Alternative WET Test Procedure in
NPDES permits, using single concentration screening tests, with multiple dilution follow-up upon a test
failure.
Page 6 of 11

Describe proposed toxicity test requirement: This is a Major POTW, and a chronic WET limit will
continue on a quarterly frequency at an effluent concentration defined as follows:
Table 6. effluent concentration for chronic WET limit
Permitted flow
3.0 MGD
4.0 MGD
6.0 MGD
Effluent concentration
20.0 %
24.6 %
33.0 %
Mercury Statewide TMDL Evaluation
There is a statewide TMDL for mercury approved by EPA in 2012. The TMDL target was to comply
with EPA's mercury fish tissue criteria (0.3 mg/kg) for human health protection. The TMDL established a
wasteload allocation for point sources of 37 kg/year (81 lb/year), and is applicable to municipals and
industrial facilities with known mercury discharges. Given the small contribution of mercury from point
sources (-2% of total load), the TMDL emphasizes mercury minimization plans (MMPs) for point source
control. Municipal facilities > 2 MGD and discharging quantifiable levels of mercury (>1 ng/1) will
receive an MMP requirement. Industrials are evaluated on a case -by -case basis, depending if mercury is a
pollutant of concern. Effluent limits may also be added if annual average effluent concentrations exceed
the WQBEL value (based on the NC WQS of 12 ng/1) and/or if any individual value exceeds a TBEL
value of 47 ng/1
Table 7. Mercury Effluent Data Summary
2016
2017
2018
2019
# of Samples
4
11
5
1
Annual Average Conc. n /L
3.9
3.5
2.2
4.3
Maximum Conc., n /L
6.92
7.33
2.74
4.34
TBEL, n /L
47
WQBEL, ng/L
36.5
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 and mercury limit will be removed from the permit. However, since the facility is >2
MGD and reported quantifiable levels of mercury (> 1 ng/1), a mercury minimization plan (MMP) is
required and remains in the permit.
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: NA
If applicable, describe any special actions (HQW or ORW) this receiving stream and classification shall
comply with in order to protect the designated waterbody: NA
If applicable, describe any compliance schedules proposed for this permit renewal in accordance with
1 SA NCAC 2H 010 7(c) (2) (B), 40CFR 122.47, and EPA May 2007 Memo: NA
Page 7 of 11

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
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
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 213.0201. 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 2B.0500; 2)
NPDES Guidance, Monitoring Frequency for Toxic Substances (7/15/2010 Memo); 3) NPDES Guidance,
Reduced Monitoring Frequencies for Facilities with Superior Compliance (10/22/2012 Memo); 4) Best
Page 8 of 11

Professional Judgement (BPJ). Per US EPA (Interim Guidance, 1996), monitoring requirements are not
considered effluent limitations under Section 402(o) of the Clean Water Act, and therefore anti -
backsliding prohibitions would not be triggered by reductions in monitoring frequencies.
For instream monitoring, refer to Section 4.
11. Electronic Reporting Requirements
The US EPA NPDES Electronic Reporting Rule was finalized on December 21, 2015. Effective
December 21, 2016, NPDES regulated facilities are required to submit Discharge Monitoring Reports
(DMRs) electronically. Effective December 21, 2020, NPDES regulated facilities will be required to
submit additional NPDES reports electronically. This permit contains the requirements for electronic
reporting, consistent with Federal requirements.
12.Summary of Proposed Permitting Actions:
Table 8. Current Permit Conditions and Proposed Changes
Added tiered flow pages for 3.0 MGD and 4.0 MGD.
Parameter
Current Permit
Proposed Change
Basis for Condition/Change
Effluent Pages
6.0 MGD
Add 3.0 and 4.0 MGD
15A NCAC 2B .0505. Permittee's
request to add tiered pages
Flow
MA 6.0 MGD
MA 3/4/6 MGD
15A NCAC 2B .0505
BOD5
Summer:
No change
WQBEL. Based on protection of DO
(All flow pages)
MA 28 mg/1
standard. 15A NCAC 213.0200
WA 12 mg/1
Winter:
MA 30 mg/l
WA 45 m /l
NH3-N
Summer:
No change
WQBEL. Based on protection of
(All flow pages)
MA 2.6 mg/1
State WQ criteria. 15A NCAC
WA 7.8 mg/1
2B.0200
Winter:
MA 8.9 mg/1
WA 26.7 mg/1
TSS
MA 30 mg/l
No change
TBEL. Secondary treatment
(All flow pages)
WA 45 mg/l
standards/40 CFR 133 / 15A NCAC
2B .0406
Fecal coliform
MA 200 /100ml
No change
WQBEL. State WQ standard, 15A
(All flow pages)
WA 400 /100ml
NCAC 2B .0200
DO
> 5 mg/l
No change
WQBEL. State WQ standard, 15A
(All flow pages)
NCAC 2B .0200
pH
6 — 9 SU
No change
WQBEL. State WQ standard, 15A
(All flow pages)
NCAC 2B .0200
TRC
DM 28 µg/L
No change
WQBEL. State WQ standard, 15A
(All flow pages)
NCAC 2B .0200
Page 9 of 11

Total Nitrogen
Monitor Quarterly
No change
WQBEL. State WQ standard, 15A
(All flow pages)
NCAC 2B .0200
Total Phosphorus
Monitor Only
No change
WQBEL. State WQ standard, 15A
(All flow pages)
NCAC 2B .0200
Total Copper
MA 19.6 µg/L
Remove from permit
Reasonable Potential Analysis. No
DM 19.6 µg/L
RP and predicted max < 50%
allowable discharge concentration.
Total Zinc
MA 152.2 µg/L
Remove from permit
Reasonable Potential Analysis. No
DM 152.2 µg/L
RP and predicted max < 50%
allowable discharge concentration.
Total Mercury
AA 36.5 ng/L
Remove from permit
Mercury TMDL evaluation
Total
No requirement
Add limit and monthly
Reasonable Potential Analysis. RP
Molybdenum
monitoring for all
exists for exceeding WQS
pages
Total Selenium
No requirement
Add limit and monthly
Reasonable Potential Analysis. RP
monitoring for all
exists for exceeding WQS
pages
Total Thallium
For 6.0 MGD page
Recalculated limits
Reasonable Potential Analysis. RP
MA 1.43 µg/L
based on updated
exists for exceeding WQS
DM 1.43 µg/L
criteria for thallium
Updated NC criteria for thallium
for all pages
Total Arsenic
For 6.0 MGD page
Monitor only for 3.0
Reasonable Potential Analysis. RP
MA 152.2 µg/L
and 4.0 MGD pages
exists for exceeding WQS
DM 184.2 µg/L
Add recalculated
limits for 6.0 MGD
pages
Total Cyanide
For 6.0 MGD page
Remove limit, keep
Reasonable Potential Analysis. No
MA 15 µg/L
quarterly monitoring
RP and predicted max < 50%
DM 59.1 µg/L
for all flow pages
allowable discharge concentration.
Chlorides
For 6.0 MGD page
No change
Reasonable Potential Analysis. No
Monitor quarterly
RP and predicted max > 50%
allowable discharge concentration.
Mercury
Required in the permit
No change
WQBEL. Consistent with 2012
Minimization Plan
Statewide Mercury TMDL
(MMP)
Implementation.
Total Hardness
No requirement
Add effluent and
Required to assess dissolved metal
upstream monitoring
limitations
based on the new 2016
dissolved metal
standards
Toxicity Test
Chronic limit, 33% at 6
No change for 6 MGD
WQBEL. No toxics in toxic
MGD
Add 20% at 3 MGD,
amounts. 15A NCAC 2B.0200 and
24.6% at 4 MGD
15A NCAC 2B.0500
Instream
Required in the permit
No change
15A NCAC 2B .0500
Temperature
Instream DO
Required in the permit
No change
15A NCAC 2B .0500
Instream
Required in the permit
No change
15A NCAC 2B .0500
Conductivity
Page 10 of 11

Effluent Pollutant
Three times per permit
No change
40 CFR 122
Scan
cycle
Electronic
Required in the permit
No change
In accordance with EPA Electronic
Reporting
Reporting Rule 2015.
MGD — Million gallons per day, MA - Monthly Average, WA — Weekly Average, DM — Daily Max,
AA — Annual Average
13. Public Notice Schedule:
Permit to Public Notice: 09/04/2019
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 Cassidy Kurtz at [phone] or via email at [e-mail].
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):
• NPDES Implementation of Instream Dissolved Metals Standards — Freshwater Standards
• NH3-N and TRC WLA (for 3.0, 4.0, and 6.0 MGD flow tiers)
• Whole Effluent Toxicity Testing and Self Monitoring Summary
• Instream Data Summary
• Monitoring Report Violations (Limit Violations) Summary
• BOD and TSS Removal Rate Summary
• Mercury TMDL Evaluation
• RPA Spreadsheet Summary (for 3.0, 4.0, and 6.0 MGD flow tiers)
• Pretreatment Information Request Form
Page 11 of 11

Permit No. NCO020737
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/1
(Dissolved)
Chronic FW, µg/l
(Dissolved)
Acute SW, µg/1
(Dissolved)
Chronic SW, µg/1
(Dissolved)
Arsenic
340
150
69
36
Beryllium
65
6.5
---
---
Cadmium
Calculation
Calculation
40
8.8
Chromium III
Calculation
Calculation
---
---
Chromium VI
16
11
1100
50
Copper
Calculation
Calculation
4.8
3.1
Lead
Calculation
Calculation
210
8.1
Nickel
Calculation
Calculation
74
8.2
Silver
Calculation
0.06
1.9
0.1
Zinc
Calculation
Calculation
90
81
Table 1 Notes:
1. FW= Freshwater, SW= Saltwater
2. Calculation = Hardness dependent standard
3. Only the aquatic life standards listed above are expressed in dissolved form. Aquatic life
standards for Mercury and selenium are still expressed as Total Recoverable Metals due to
bioaccumulative concerns (as are all human health standards for all metals). It is still necessary
to evaluate total recoverable aquatic life and human health standards listed in 15A NCAC
213.0200 (e.g., arsenic at 10 µg/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^{0.9151 [In hardness]-3.14851
Cadmium, Acute Trout waters
WER*{1.136672-[ln hardness] (0.041838)} e^{0.9151[ln hardness] -3.623 61
Cadmium, Chronic
WER*{1.101672-[In hardness] (0.041838)} e^{0.7998[ln hardness]-4.4451}
Chromium III, Acute
WER*0.316 e^{0.8190[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)} • eAll .273[ln hardness] -1.460}
Lead, Chronic
WER*{1.46203-[ln hardness] (0.145712)} • eAll .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. NCO020737
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) "'
• 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. NCO020737
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 + s7Q 10, 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 1 + { [Kpo] [SS(I+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. NC0020737
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 Vl. 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)
120
Average from 3 Effluent Pollutant Scan
[Total as, CaCO3 or (Ca+Mg)]
Average Upstream Hardness (mg/L)
25
Default with no data
[Total as, CaCO3 or (Ca+Mg)]
7Q10 summer (cfs)
19
NPDES files, BIMS
1Q10 (cfs)
16.69
Calculated from 7Q10 summer
Permitted Flow (MGD)
6
NPDES files, BIMS
Date: 3/19/2019
Permit Writer: Bing Bai
Page 4 of 4

NH3/TRC WLA Calculations
Facility: Pilot Creek WWTP
PermitNo. NC0020737
Prepared By: Bing Bai
Enter Design Flow (MGD): 3
Enter s7Q10 (cfs): 19
Enter w7Q10 cfs : 42
Total Residual Chlorine (TRC)
Daily Maximum Limit (ug/1)
Ammonia (Summer)
Monthly Average Limit (mg NH3-N/1)
s7Q10 (CFS)
19
s7Q10 (CFS)
19
DESIGN FLOW (MGD)
3
DESIGN FLOW (MGD)
3
DESIGN FLOW (CFS)
4.65
DESIGN FLOW (CFS)
4.65
STREAM STD (UG/L)
17.0
STREAM STD (MG/L)
1.0
Upstream Bkgd (ug/1)
0
Upstream Bkgd (mg/1)
0.22
IWC (%)
19.66
IWC (%)
19.66
Allowable Conc. (ug/1)
86
Allowable Conc. (mg/1)
4.2
Ammonia (Winter)
Monthly Average Limit (mg NH3-N/1)
Fecal Coliform
w7Q10 (CFS)
42
Monthly Average Limit:
200/100ml DESIGN FLOW (MGD)
3
(If DF >331; Monitor)
DESIGN FLOW (CFS)
4.65
(If DF<331; Limit)
STREAM STD (MG/L)
1.8
Dilution Factor (DF)
5.09 Upstream Bkgd (mg/1)
0.22
IWC (%)
9.97
Allowable Conc. (mg/1)
16.1
Total Residual Chlorine
1. Cap Daily Max limit at 28 ug/I to protect for acute toxicity
Ammonia (as NH3-N)
1. If Allowable Conc > 35 mg/I, Monitor Only
2. Monthly Avg limit x 3 = Weekly Avg limit (Municipals)
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)

NH3/TRC WLA Calculations
Facility: Pilot Creek WWTP
PermitNo. NC0020737
Prepared By: Bing Bai
Enter Design Flow (MGD): 4
Enter s7Q10 (cfs): 19
Enter w7Q10 cfs : 42
Total Residual Chlorine (TRC)
Daily Maximum Limit (ug/1)
Ammonia (Summer)
Monthly Average Limit (mg NH3-N/1)
s7Q10 (CFS)
19
s7Q10 (CFS)
19
DESIGN FLOW (MGD)
4
DESIGN FLOW (MGD)
4
DESIGN FLOW (CFS)
6.2
DESIGN FLOW (CFS)
6.2
STREAM STD (UG/L)
17.0
STREAM STD (MG/L)
1.0
Upstream Bkgd (ug/1)
0
Upstream Bkgd (mg/1)
0.22
IWC (%)
24.60
IWC (%)
24.60
Allowable Conc. (ug/1)
69
Allowable Conc. (mg/1)
3.4
Ammonia (Winter)
Monthly Average Limit (mg NH3-N/1)
Fecal Coliform
w7Q10 (CFS)
42
Monthly Average Limit:
200/100ml DESIGN FLOW (MGD)
4
(If DF >331; Monitor)
DESIGN FLOW (CFS)
6.2
(If DF<331; Limit)
STREAM STD (MG/L)
1.8
Dilution Factor (DF)
4.06 Upstream Bkgd (mg/1)
0.22
IWC (%)
12.86
Allowable Conc. (mg/1)
12.5
Total Residual Chlorine
1. Cap Daily Max limit at 28 ug/I to protect for acute toxicity
Ammonia (as NH3-N)
1. If Allowable Conc > 35 mg/I, Monitor Only
2. Monthly Avg limit x 3 = Weekly Avg limit (Municipals)
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)

NH3/TRC WLA Calculations
Facility: Pilot Creek WWTP
PermitNo. NC0020737
Prepared By: Bing Bai
Enter Design Flow (MGD): 6
Enter s7Q10 (cfs): 19
Enter w7Q10 (cfs): 42
Total Residual Chlorine (TRC)
Daily Maximum Limit (ug/1)
Ammonia (Summer)
Monthly Average Limit (mg NH3-N/1)
s7Q10 (CFS)
19
s7Q10 (CFS)
19
DESIGN FLOW (MGD)
6
DESIGN FLOW (MGD)
6
DESIGN FLOW (CFS)
9.3
DESIGN FLOW (CFS)
9.3
STREAM STD (UG/L)
17.0
STREAM STD (MG/L)
1.0
Upstream Bkgd (ug/1)
0
Upstream Bkgd (mg/1)
0.22
IWC (%)
32.86
IWC (%)
32.86
Allowable Conc. (ug/1)
52
Allowable Conc. (mg/1)
2.6
Ammonia (Winter)
Monthly Average Limit (mg NH3-N/1)
Fecal Coliform
w7Q10 (CFS)
42
Monthly Average Limit:
200/100mI DESIGN FLOW (MGD)
6
(If DF >331; Monitor)
DESIGN FLOW (CFS)
9.3
(If DF<331; Limit)
STREAM STD (MG/L)
1.8
Dilution Factor (DF)
3.04 Upstream Bkgd (mg/1)
0.22
IWC (%)
18.13
Allowable Conc. (mg/1)
8.9
Total Residual Chlorine
1. Cap Daily Max limit at 28 ug/I to protect for acute toxicity
Ammonia (as NH3-N)
1. If Allowable Conc > 35 mg/I, Monitor Only
2. Monthly Avg limit x 3 = Weekly Avg limit (Municipals)
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)

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Instream Data Summary
Instream DO •DO Upstream
• • DO Downstream
15
5 �• •
•
0
12/27/2014 7/15/2015 1/31/2016 8/18/2016 3/6/2017 9/22/2017 4/10/2018 10/27/2018 5/15/2019
Date
40
30
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20
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N
10
0
12/27/2014
600
500
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200
100
0
12/27/2014
•
7/15/2015
•
• •
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•,14•0
•
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•
7/15/2015
Instream Temperature
4P
r ,
• Upstream
• Downstream
1/31/2016 8/18/2016 3/6/2017 9/22/2017 4/10/2018 10/27/2018 5/15/2019
Date
Instream Conductivity •Upstream
• • • Downstream
As •
• �, • 10 • •
• P
• • • •
.( NO 0
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�� : • � :� •6•• •• •
----- NO 4"M
1/31/2016 8/18/2016 3/6/2017 9/22/2017 4/10/2018 10/27/2018 5/15/2019
Date

MONITORING REPORT(MR) VIOLATIONS for:
Permit: NCO020737 MRS Between 4 - 2016 and 3 - 2019 Region: %
Facility Name: % Param Name % County: %
Major Minor: %
Report Date: 03/12/19
Violation Category:Limit Violation Program Category:
Subbasin:% Violation Action: %
Page: 1 of 4
PERMIT: NCO020737 FACILITY: City of Kings Mountain -Pilot Creek WWTP COUNTY: Cleveland REGION: Mooresville
Limit Violation
MONITORING OUTFALU VIOLATION UNIT OF CALCULATED %
REPORT PPI LOCATION PARAMETER DATE FREQUENCY MEASURE LIMIT VALUE Over VIOLATION TYPE VIOLATION ACTION
06-2017
001
Effluent
06-2017
001
Effluent
07-2017
001
Effluent
05-2018
001
Effluent
05-2018
001
Effluent
07-2016
001
Effluent
03-2017
001
Effluent
03-2017
001
Effluent
03-2017
001
Effluent
04-2017
001
Effluent
04-2017
001
Effluent
04-2017
001
Effluent
05-2017
001
Effluent
05-2017
001
Effluent
06-2017
001
Effluent
Arsenic, Total (as As)
Arsenic, Total (as As)
Arsenic, Total (as As)
Arsenic, Total (as As)
Arsenic, Total (as As)
Chlorine, Total Residual
Chlorine, Total Residual
Chlorine, Total Residual
Chlorine, Total Residual
Chlorine, Total Residual
Chlorine, Total Residual
Chlorine, Total Residual
Chlorine, Total Residual
Chlorine, Total Residual
Chlorine, Total Residual
06/15/17
Monthly
ug/I
184.2
202
9.7
Daily Maximum
Proceed to
Exceeded
Enforcement Case
06/30/17
Monthly
ug/I
152.2
202
32.7
Monthly Average
Proceed to
Exceeded
Enforcement Case
07/31/17
Monthly
ug/I
152.2
155
1.8
Monthly Average
Proceed to NOD
Exceeded
05/22/18
Monthly
ug/I
184.2
200
8.6
Daily Maximum
Proceed to
Exceeded
Enforcement Case
05/31/18
Monthly
ug/I
152.2
190
24.8
Monthly Average
Proceed to
Exceeded
Enforcement Case
07/12/16
5 X week
ug/I
28
29
3.6
Daily Maximum
No Action, BPJ
Exceeded
03/13/17
5 X week
ug/I
28
30
7.1
Daily Maximum
No Action, BPJ
Exceeded
03/14/17
5 X week
ug/I
28
31.5
12.5
Daily Maximum
No Action, BPJ
Exceeded
03/21/17
5 X week
ug/I
28
33
17.9
Daily Maximum
No Action, BPJ
Exceeded
04/21/17
5 X week
ug/I
28
32.5
16.1
Daily Maximum
No Action, BPJ
Exceeded
04/24/17
5 X week
ug/I
28
35
25
Daily Maximum
No Action, BPJ
Exceeded
04/26/17
5 X week
ug/I
28
41
46.4
Daily Maximum
No Action, BPJ
Exceeded
05/02/17
5 X week
ug/I
28
30.5
8.9
Daily Maximum
No Action, BPJ
Exceeded
05/04/17
5 X week
ug/I
28
28.5
1.8
Daily Maximum
No Action, BPJ
Exceeded
06/21 /17
5 X week
ug/I
28
36.5
30.4
Daily Maximum
No Action, BPJ
Exceeded

MONITORING REPORT(MR) VIOLATIONS for:
Permit: NCO020737 MRS Between 4 - 2016 and 3 - 2019 Region: %
Facility Name: % Param Name % County: %
Major Minor: %
Report Date: 03/12/19 Page: 2 of 4
Violation Category:Limit Violation Program Category: %
Subbasin:% Violation Action: %
PERMIT: NCO020737
FACILITY:
City of Kings Mountain -Pilot Creek WWTP
COUNTY: Cleveland
REGION: Mooresville
Limit Violation
MONITORING
OUTFALL/
VIOLATION
UNIT OF
CALCULATED
%
REPORT
PPI
LOCATION
PARAMETER
DATE
FREQUENCY
MEASURE
LIMIT
VALUE
Over
VIOLATION TYPE
VIOLATION ACTION
05 -2018
001
Effluent
Chlorine, Total Residual
05/03/18
5 X week
ug/I
28
31
10.7
Daily Maximum
No Action, BPJ
Exceeded
07 -2018
001
Effluent
Chlorine, Total Residual
07/12/18
5 X week
ug/I
28
31
10.7
Daily Maximum
No Action, BPJ
Exceeded
07 - 2018
001
Effluent
Chlorine, Total Residual
07/18/18
5 X week
ug/I
28
31
10.7
Daily Maximum
No Action, BPJ
Exceeded
07 - 2018
001
Effluent
Chlorine, Total Residual
07/20/18
5 X week
ug/I
28
29
3.6
Daily Maximum
No Action, BPJ
Exceeded
08 - 2018
001
Effluent
Chlorine, Total Residual
08/02/18
5 X week
ug/1
28
29
3.6
Daily Maximum
No Action, BPJ
Exceeded
08 - 2018
001
Effluent
Chlorine, Total Residual
08/22/18
5 X week
ug/I
28
31
10.7
Daily Maximum
No Action, BPJ
Exceeded
08 - 2018
001
Effluent
Chlorine, Total Residual
08/24/18
5 X week
ug/I
28
29
3.6
Daily Maximum
No Action, BPJ
Exceeded
09 - 2018
001
Effluent
Chlorine, Total Residual
09/04/18
5 X week
ug/I
28
31
10.7
Daily Maximum
No Action, BPJ
Exceeded
09 - 2018
001
Effluent
Chlorine, Total Residual
09/06/18
5 X week
ug/I
28
31
10.7
Daily Maximum
No Action, BPJ
Exceeded
09 - 2018
001
Effluent
Chlorine, Total Residual
09/21/18
5 X week
ug/I
28
34
21.4
Daily Maximum
No Action, BPJ
Exceeded
10 - 2018
001
Effluent
Chlorine, Total Residual
10/17/18
5 X week
ug/I
28
29
3.6
Daily Maximum
No Action, BPJ
Exceeded
11 - 2018
001
Effluent
Chlorine, Total Residual
11/01/18
5 X week
ug/I
28
32
14.3
Daily Maximum
No Action, BPJ
Exceeded
11 _ 2018
001
Effluent
Chlorine, Total Residual
11/19/18
5 X week
ug/I
28
29
3.6
Daily Maximum
No Action, BPJ
Exceeded
12 _ 2018
001
Effluent
Chlorine, Total Residual
12/03/18
5 X week
ug/I
28
29
3.6
Daily Maximum
No Action, BPJ
Exceeded
12 _ 2018
001
Effluent
Chlorine, Total Residual
12/04/18
5 X week
ug/I
28
32
14.3
Daily Maximum
No Action, BPJ
Exceeded
12 - 2018
001
Effluent
Chlorine, Total Residual
12/07/18
5 X week
ug/I
28
29
3.6
Daily Maximum
No Action, BPJ
Exceeded

MONITORING REPORT(MR) VIOLATIONS for:
Permit: NCO020737 MRS Between 4 - 2016 and 3 - 2019 Region: %
Facility Name: % Param Name % County: %
Major Minor: %
Report Date: 03/12/19 Page: 3 of 4
Violation Category:Limit Violation Program Category: %
Subbasin:% Violation Action: %
PERMIT: NCO020737
FACILITY: City of Kings Mountain -Pilot Creek WWTP
COUNTY: Cleveland
REGION: Mooresville
Limit Violation
MONITORING
OUTFALL/
VIOLATION
UNIT OF
CALCULATED
%
REPORT
PPI
LOCATION
PARAMETER
DATE
FREQUENCY
MEASURE
LIMIT
VALUE
Over
VIOLATION TYPE
VIOLATION ACTION
01 -2019
001
Effluent
Chlorine, Total Residual
01/14/19
5 X week
ug/I
28
31
10.7
Daily Maximum
No Action, BPJ
Exceeded
01 - 2019
001
Effluent
Chlorine, Total Residual
01/16/19
5 X week
ug/I
28
32
14.3
Daily Maximum
No Action, BPJ
Exceeded
10 - 2016
001
Effluent
Nitrogen, Ammonia Total (as
10/31/16
5 X week
mg/I
2.6
2.93
12.8
Monthly Average
Proceed to NOV
N) - Concentration
Exceeded
09 - 2017
001
Effluent
Nitrogen, Ammonia Total (as
09/16/17
5 X week
mg/I
7.8
8.46
8.5
Weekly Average
Proceed to
N) - Concentration
Exceeded
Enforcement Case
09 - 2017
001
Effluent
Nitrogen, Ammonia Total (as
09/23/17
5 X week
mg/I
7.8
13.8
76.9
Weekly Average
Proceed to
N) - Concentration
Exceeded
Enforcement Case
09 -2017
001
Effluent
Nitrogen, Ammonia Total (as
09/30/17
5 X week
mg/I
2.6
7.37
183.5
Monthly Average
Proceed to
N) - Concentration
Exceeded
Enforcement Case
09 -2018
001
Effluent
Nitrogen, Ammonia Total (as
09/30/18
5 X week
mg/I
2.6
3.58
37.7
Monthly Average
Proceed to
N) - Concentration
Exceeded
Enforcement Case
06 -2017
001
Effluent
Solids, Total Suspended -
06/24/17
5 X week
mg/I
45
71.9
59.8
Weekly Average
Proceed to
Concentration
Exceeded
Enforcement Case
04 - 2016
001
Effluent
Thallium, Total (As TI)
04/14/16
Monthly
ug/1
1.43
24.4
1,606.3
Daily Maximum
No Action, SOC
Exceeded
Pending
04 - 2016
001
Effluent
Thallium, Total (As TI)
04/30/16
Monthly
ug/1
1.43
24.4
1,606.3
Monthly Average
No Action, SOC
Exceeded
Pending
05 - 2016
001
Effluent
Thallium, Total (As TI)
05/05/16
Monthly
ug/1
1.43
32.8
2,193.7
Daily Maximum
No Action, SOC
Exceeded
Pending
05 - 2016
001
Effluent
Thallium, Total (As TI)
05/12/16
Monthly
ug/1
1.43
35.05
2,351.0
Daily Maximum
No Action, SOC
Exceeded
Pending
05 - 2016
001
Effluent
Thallium, Total (As TI)
05/19/16
Monthly
ug/1
1.43
38.1
2,564.3
Daily Maximum
No Action, SOC
Exceeded
Pending
05 - 2016
001
Effluent
Thallium, Total (As TI)
05/31/16
Monthly
ug/1
1.43
26.487
1,752.3
Monthly Average
No Action, SOC
Exceeded
Pending
06 - 2016
001
Effluent
Thallium, Total (As TI)
06/02/16
Monthly
ug/1
1.43
11
669.2
Daily Maximum
No Action, SOC
Exceeded
Pending
06 - 2016
001
Effluent
Thallium, Total (As TI)
06/09/16
Monthly
ug/1
1.43
76
5,214.7
Daily Maximum
No Action, SOC
Exceeded
Pending

MONITORING REPORT(MR) VIOLATIONS for:
Permit: NCO020737 MRS Between 4 - 2016 and 3 - 2019 Region: %
Facility Name: % Param Name % County: %
Major Minor: %
Report Date: 03/12/19 Page: 4 of 4
Violation Category:Limit Violation Program Category: %
Subbasin:% Violation Action: %
PERMIT: NCO020737 FACILITY: City of Kings Mountain -Pilot Creek WWTP COUNTY: Cleveland REGION: Mooresville
Limit Violation
MONITORING OUTFALL/ VIOLATION UNIT OF CALCULATED %
REPORT PPI LOCATION PARAMETER DATE FREQUENCY MEASURE LIMIT VALUE Over VIOLATION TYPE VIOLATION ACTION
06 -2016
001
Effluent
Thallium, Total (As TI)
06/16/16
Monthly
ug/I
1.43
97
6,683.2
Daily Maximum
No Action, SOC
Exceeded
Pending
06 - 2016
001
Effluent
Thallium, Total (As TI)
06/23/16
Monthly
ug/I
1.43
86
5,914.0
Daily Maximum
No Action, SOC
Exceeded
Pending
06 - 2016
001
Effluent
Thallium, Total (As TI)
06/30/16
Monthly
ug/I
1.43
73
5,004.9
Daily Maximum
No Action, SOC
Exceeded
Pending
06 - 2016
001
Effluent
Thallium, Total (As TI)
06/30/16
Monthly
ug/I
1.43
68.6
4,697.2
Monthly Average
No Action, SOC
Exceeded
Pending
08 - 2016
001
Effluent
Thallium, Total (As TI)
08/31/16
Monthly
ug/I
60.1
72.5
20.6
Monthly Average
Proceed to
Exceeded
Enforcement Case

NCO020737 City of Kings Mountain Pilot Creek WWTP 3/14/2019
BOD monthly removal
rate
TSS monthly removal
rate
Month
RR (%)
Month
RR (%)
Month
RR (%)
Month
RR (%)
May-15
99.24
November-17
99.08
May-15
96.72
November-17
97.71
June-15
99.17
December-17
98.77
June-15
97.07
December-17
96.95
July-15
99.49
January-18
98.74
July-15
96.35
January-18
97.06
August-15
99.26
February-18
98.74
August-15
96.14
February-18
96.60
September-15
99.24
March-18
99.10
September-15
96.99
March-18
95.44
October-15
99.35
April-18
98.84
October-15
97.03
April-18
96.72
November-15
99.34
May-18
98.94
November-15
93.03
May-18
98.11
December-15
98.85
June-18
99.04
December-15
95.89
June-18
98.03
January-16
99.35
July-18
99.16
January-16
97.43
July-18
98.18
February-16
99.21
August-18
98.42
February-16
97.27
August-18
97.91
March-16
99.26
September-18
97.03
March-16
97.77
September-18
96.80
April-16
99.08
October-18
98.69
April-16
97.62
October-18
96.99
May-16
99.24
November-18
98.34
May-16
97.69
November-18
95.61
June-16
99.04
December-18
98.36
June-16
97.78
December-18
94.86
July-16
99.16
January-19
98.66
July-16
97.93
January-19
95.98
August-16
99.33
February-19
August-16
98.19
February-19
September-16
99.27
March-19
September-16
98.35
March-19
October-16
99.10
April-19
October-16
97.84
April-19
November-16
99.34
May-19
November-16
97.82
May-19
December-16
99.54
June-19
December-16
98.54
June-19
January-17
99.37
July-19
January-17
97.03
July-19
February-17
99.10
August-19
February-17
98.16
August-19
March-17
99.37
September-19
March-17
97.31
September-19
April-17
98.97
October-19
April-17
94.68
October-19
May-17
99.17
November-19
May-17
97.57
November-19
June-17
98.97
December-19
June-17
92.04
December-19
July-17
99.11
January-20
July-17
97.99
January-20
August-17
98.97
February-20
August-17
97.77
February-20
September-17
98.35
March-20
September-17
97.24
March-20
October-17
99.21
April-20
October-17
98.03
April-20
Overall BOD removal
rate
99.01
Overall TSSD removal
rate
96.98

3/21/19 WQS = 12 ng/L
Facility Name
Pilot Creek WWTP / NC0020737
/Permit No.
Total Mercury 1631E PQL = 0.5 ng/L
Date Modifier Data Entry Value
MERCURY WQBEL/TBEL EVALUATION V:2013-6
No Limit Required
MMP Required
7Q10s = 19.000 cfs WQBEL = 36.52 ng/L
Permitted Flow = 6.000 47 ng/L
5/12/16
2.71
2.71
6/9/16
2.39
2.39
11/3/16
6.92
6.92
12/16/16
3.67
3.67
3.9 ng/L -
Annual Average for 2016
1/12/17
0.813
0.813
2/16/17
3.72
3.72
3/9/17
4.69
4.69
4/6/17
4.11
4.11
5/11/17
3.3
3.3
6/8/17
7.33
7.33
7/13/17
3.94
3.94
8/10/17
3.42
3.42
10/12/17
1.7
1.7
11/9/17
2.56
2.56
12/7/17
2.53
2.53
3.5 ng/L -
Annual Average for 2017
1/11/18
2.51
2.51
1/18/18
0.9135
0.9135
4/19/18
2.24
2.24
7/19/18
2.74
2.74
10/18/18
2.46
2.46
2.2 ng/L -
Annual Average for 2018
1/17/19
4.34
4.34
4.3 ng/L -
Annual Average for 2019

Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators
MAXIMUM DATA POINTS = 58
REQUIRED DATA ENTRY
Table 1. Project Information
❑CHECK IF HQW OR ORW WQS
Facility Name
WWTP/WTP Class
NPDES Permit
Outfall
Flow, Qw (MGD)
Receiving Stream
HUC Number
Stream Class
Pilot Creek WWTP
IV
NCO020737
001
3.000
Buffalo Creek
03050105
C
❑Apply WS Hardness WQC
7Q10s (cfs)
7Q10w (cfs)
30Q2 (cfs)
QA (cfs)
1Q10s (cfs)
19.00
42.00
54.00
162.00
15.69
Effluent Hardness
Upstream Hardness _
Combined HardnessChronic
___
Combined Hardness Acute
120 mg/L (Avg)
_ _ _ _ 25 mg/L (Avg)
43.68 mg/L
_ _ _ _ _ _ _ _
_ _ 46.72 mg/L
Data Source(s)
❑CHECK TO APPLY MODEL
Follow directions for data entry. In some cases a
comment menu list the available choices or a
dropdown menu will provide a list you may select
from. Error message occur if data entry does not
meet input criteria.
Par01
Par02
Par03
Par04
Par05
Par06111111
Par07
Par08
Par09
Par10
Par19
Par12
Par13
Par14
Parts
Par16
Par17
Par18
Par19
Par20
Par21
Par22
Par23
Par24
Par25
Table 2. Parameters of Concern
Name w4s Type Chronic Modifier Acute PQL Units
Arsenic
Aquactic Life
C
150
FW
340
ug/L
Arsenic
Human Health
Water Supply
C
10
HH/WS
N/A
ug/L
Beryllium
Aquatic Life
NC
6.5
FW
65
ug/L
Cadmium
Aquatic Life
NC
0.8994
FW
5.5911
ug/L
Chlorides
Aquatic Life
NC
230
FW
Chlorinated Phenolic Compounds
Water supply
NC
1
A
ug/L
Total Phenolic Compounds
Aquatic Life
NC
300
A
ug/L
Chromium III
Aquatic Life
NC
185.9363
FW
1510.3749
ug/L
Chromium VI
Aquatic Life
NC
11
FW
16
lag/L
Chromium, Total
Aquatic Life
NC
N/A
FW
N/A
lag/L
Copper
Aquatic Life
NC
12.6950
FW
18.8747
ug/L
Cyanide
Aquatic Life
NC
5
FW
22
10
ug/L
Fluoride
Aquatic Life
NC
1,800
FW
ug/L
Lead
Aquatic Life
NC
5.4951
FW
151.9698
ug/L
Mercury
Aquatic Life
NC
12
FW
0.5
ng/L
Molybdenum
Human Health
NC
2000
HH
ug/L
Nickel
Aquatic Life
NC
59.6924
FW
568.9105
lag/L
Nickel
Water Supply
NC
25.0000
WS
N/A
lag/L
Selenium
Aquatic Life
NC
5
FW
56
ug/L
Silver
Aquatic Life
NC
0.06
FW
0.8688
ug/L
Zinc
Aquatic Life
NC
203.3372
FW
213.5182
ug/L
Thallium
Human Health
NC
2
HH
lag/L
Chlorodibromomethane
Aquatic Life
C
21
FW
lag/L
Chloroform
Aquatic Life
NC
2000
FW
lag/L
Dichlorobromomethane
Aquatic Life
C
27
FW
lag/L
Copy of RPA 6 MGD, input
3/19/2019

Pilot Creek WWTP - Outfall 001
NCO020737 Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators Qw = 3 MGD
MAXIMUM
Qw (MGD) =
3.0000
1Q10S (cfs) =
15.69
7Q10S (cfs) =
19.00
7Q10W (cfs) =
42.00
30Q2 (cfs) =
54.00
Avg. Stream Flow, QA (cfs) =
162.00
Receiving Stream:
Buffalo Creek HUC 03050105
DATA POINTS = 58
WWTP/WTP Class: IV
IWC% @ 1Q10S =
22.86135693
1WC% @ 7Q10S =
19.66173362
IWC% @ 7Q10W =
9.967845659
1WC% @ 30Q2 =
7.928388747
IW%C @ QA =
2.790279028
Stream Class:
C
COMBINED HARDNESS (me/L)
Acute = 46.72 mg/L
Chronic = 43.68 mg/L
PARAMETER
NC STANDARDS OR EPA CRITERIA
REASONABLE POTENTIAL RESULTS
RECOMMENDED ACTION
TYPE
o_
Applied
Chronic Acute
n # Det. Max Pred Cw Allowable Cw
Standa
Acute (FW): 1,487.2
Arsenic
C
150 FW(7Q10s) 340
ug L
30 30
234.3
_
Chronic (FW) 762.9
No RP, Predicted Max < 50% of Allowable Cw - No
No value > Allowable Cw
Monitoring required
Arsenic
C
10 HH/WS(Qavg)
ug/L
Chronic (HH) 358.4
No RP, Predicted Max t 50% of Allowable Cw -
No value > Allowable Cw
apply Quarterly Monitoring
Acute: 284.32
Beryllium
NC
6.5 FW(7Q10s) 65
ug/L
3 0
7.50
Note: n < 9
C.V. (default)
Chronic: 33.06
No RP, Predicted Max < 50% of Allowable Cw - No
Limited data set
NO DETECTS
Max MDL = 5
Monitoring required
Acute: 24.457
No detects, all < 5
Cadmium
NC
0.8994 FW(7Q10s) 5.5911
ug/L
19 0
2.500
---------------------------------------------
Chronic: 4.574
No monitoring, shall report to targeted PQL
NO DETECTS
Max MDL = 5
Acute: NO WQS
Chlorides
NC
230 FW(7Q10s)
mg/L
18 18
468.0
_ C_ _ _ _
hronic: 1,169.8
_ _ _
No RP, Predicted Max < 50% of Allowable Cw - No
No value > Allowable Cw
Monitoring required
Acute: NO WQS
Total Phenolic Compounds
NC
300 A(30Q2)
ug/L
3 2
60.0
Note: n < 9
C.V. (default)
Chronic: 3,783.9
No RP, Predicted Max < 50% of Allowable Cw - No
Limited data set
No value > Allowable Cw
Monitoring required
Acute: 70.0
Chromium VI
NC
11 FW(7Q10s) 16
µg/L
0 0
N/A
--Chronic:-----55-9 --
--------------------------
Chromium, Total
NC
µg/L
3 0
7.5
Max reported value = 2.5
a: No monitoring required if all Total Chromium
samples are < 5 pg/L or Pred. max for Total Cr is <
Note n < 9
(default)
C.V. default
allowable Cw for Cr VI.
Limited data set
NO DETECTS
Max MDL = 5
Acute: 82.56
Copper
NC
12.6950 FW(7Q10s) 18.8747
ug/L
30 16
15.00
_
C_
hronic: 64.57
No RP, Predicted Max < 50% of Allowable Cw - No
No value > Allowable Cw
Monitoring required
Acute: 96.2
Cyanide
NC
5 FW(7Q10s) 22
10
ug/L
30 3
14.3
___ _ ______ ___
_ _ _ _ ___ _ _ _ _ _
Chronic: 25.4
_
No RP ,Predicted Max z 50% of Allowable Cw
No value > Allowable Cw
apply Quarterly Monitoring
RPA 3 MGD, rpa
Page 1 of 2 3/19/2019

Pilot Creek WWTP > Outfall 001
NCO020737 Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators Qw = 3 MGD
Acute: 664.745
Lead
NC
5.4951 FW(7Q10s) 151.9698
ug/L
12 0
4.263
Chronic: 27.948
No RP, Predicted Max < 50% of Allowable Cw - No
NO DETECTS
Max MDL = 5.8
Monitoring required
Acute: NO WQS
Molybdenum
NC
2000 HH(7Q10s)
ug/L
10 10
15,607.4
Chronic: 10,172.0
RP shown - apply Monthly Monitoring with Limit
No value > Allowable Cw
Acute (FW): 2,488.5
Nickel
NC
59.6924 FW(7Q10s) 568.9105
µg/L
12 12
75.0
_
Chronic (FW) 303.6
No RP, Predicted Max < 50% of Allowable Cw - No
No value > Allowable Cw
------------------------------
Monitoring required
Nickel
NC
25.0000 WS(7Q10s)
µg/L
Chronic (WS) 127.2
No value > Allowable Cw
Acute: 245.0
Selenium
NC
5 FW(7QlOs) 56
ug/L
13 7
278.4
Chronic: 25.4
RP shown - apply Monthly Monitoring with Limit
3 values > Allowable Cw
Acute: 3.800
No detects, 9 values < 5 ug/L, 3 values < 1 ug/L
Silver
NC
0.06 FW(7Q10s) 0.8688
ug/L
12 0
3.650
_ _ _ _ _ _ _ _ _ _ _ _
Chronic: 0.305
_ _ _ _ _ _ _ _ _ _ _ _ _ _
No monitoring, shall report to targeted PQL
NO DETECTS
Max MDL = 5
Acute: 934.0
Zinc
NC
203.3372 FW(7Q10s) 213.5182
ug/L
30 29
97.9
Chronic: 1,034.2
No RP, Predicted Max < 50% of Allowable Cw - No
No value > Allowable Cw
Monitoring required
Acute: NO WQS
Thallium
NC
2 HH(7Q10s)
µg/L
49 43
102.82000
Chronic: 10.17204
RP shown - apply Monthly Monitoring with Limit
34 values > Allowable Cw
Acute: NO WQS
Chlorodibromomethane
c
21 FW(7Q10s)
µg/L
3 3
54.60000
Note: n 5 9
C.V. (default)
Chronic: 106.80645
No RP, Predicted Max < 50% of Allowable Cw - No
Limited data set
No value > Allowable Cw
Monitoring required
Acute: NO WQS
Chloroform
NC
2000 FW(7Q10s)
µg/L
3 3
75.30000
Note: n 5 9
C.V. (default)
Chronic: 10172.04301
No RP, Predicted Max < 50% of Allowable Cw -No
Limited data set
No value > Allowable Cw
Monitoring required
Acute: NO WQS
Dichlorobromomethane
C
27 FW(7Q10s)
µg/L
3 3
28.80000
Note: n < 9
C.V. (default)
Chronic: 137.32258
No RP, Predicted Max < 50% of Allowable Cw - No
Limited data set
No value > Allowable Cw
Monitoring required
RPA 3 MGD, rpa
Page 2 of 2 3/19/2019

Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators
MAXIMUM DATA POINTS = 58
REQUIRED DATA ENTRY
Table 1. Project Information
❑CHECK IF HQW OR ORW WQS
Facility Name
WWTP/WTP Class
NPDES Permit
Outfall
Flow, Qw (MGD)
Receiving Stream
HUC Number
Stream Class
Pilot Creek WWTP
IV
NCO020737
001
4.000
Buffalo Creek
03050105
C
❑Apply WS Hardness WQC
7Q10s (cfs)
7Q10w (cfs)
30Q2 (cfs)
QA (cfs)
1Q10s (cfs)
19.00
42.00
54.00
162.00
15.69
Effluent Hardness
Upstream Hardness _
Combined HardnessChronic
___
Combined Hardness Acute
120 mg/L (Avg)
_ _ _ _ 25 mg/L (Avg)
48.37 mg/L
_ _ _ _ _ _ _ _
_ _ 51.91 mg/L
Data Source(s)
❑CHECK TO APPLY MODEL
Follow directions for data entry. In some cases a
comment menu list the available choices or a
dropdown menu will provide a list you may select
from. Error message occur if data entry does not
meet input criteria.
Par01
Par02
Par03
Par04
Par05
Par06111111
Par07
Par08
Par09
Par10
Par19
Par12
Par13
Par14
Parts
Par16
Par17
Par18
Par19
Par20
Par21
Par22
Par23
Par24
Par25
Table 2. Parameters of Concern
Name w4s Type Chronic Modifier Acute PQL Units
Arsenic
Aquactic Life
C
150
FW
340
ug/L
Arsenic
Human Health
Water Supply
C
10
HH/WS
N/A
ug/L
Beryllium
Aquatic Life
NC
6.5
FW
65
ug/L
Cadmium
Aquatic Life
NC
0.9715
FW
6.1290
ug/L
Chlorides
Aquatic Life
NC
230
FW
Chlorinated Phenolic Compounds
Water supply
NC
1
A
ug/L
Total Phenolic Compounds
Aquatic Life
NC
300
A
ug/L
Chromium III
Aquatic Life
NC
202.1500
FW
1646.4434
ug/L
Chromium VI
Aquatic Life
NC
11
FW
16
lag/L
Chromium, Total
Aquatic Life
NC
N/A
FW
N/A
lag/L
Copper
Aquatic Life
NC
13.8521
FW
20.8439
ug/L
Cyanide
Aquatic Life
NC
5
FW
22
10
ug/L
Fluoride
Aquatic Life
NC
1,800
FW
ug/L
Lead
Aquatic Life
NC
6.1555
FW
170.8175
ug/L
Mercury
Aquatic Life
NC
12
FW
0.5
ng/L
Molybdenum
Human Health
NC
2000
HH
ug/L
Nickel
Aquatic Life
NC
65.0767
FW
621.9293
lag/L
Nickel
Water Supply
NC
25.0000
WS
N/A
lag/L
Selenium
Aquatic Life
NC
5
FW
56
ug/L
Silver
Aquatic Life
NC
0.06
FW
1.0414
ug/L
Zinc
Aquatic Life
NC
221.7078
FW
233.4487
ug/L
Thallium
Human Health
NC
2
HH
lag/L
Chlorodibromomethane
Aquatic Life
C
21
FW
lag/L
Chloroform
Aquatic Life
NC
2000
FW
lag/L
Dichlorobromomethane
Aquatic Life
C
27
FW
lag/L
Copy of RPA 6 MGD, input
3/19/2019

Pilot Creek WWTP I Outfall 001
NCO020737 Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators Qw = 4 MGD
MAXIMUM
Qw (MGD) =
4.0000
1Q10S (cfs) =
15.69
7Q10S (cfs) =
19.00
7Q10W (cfs) =
42.00
30Q2 (cfs) =
54.00
Avg. Stream Flow, QA (cfs) =
162.00
Receiving Stream:
Buffalo Creek HUC 03050105
DATA POINTS = 58
WWTP/WTP Class: IV
IWC% @ 1Q10S =
28.32343536
1WC% @ 7Q10S =
24.6031746
IWC% @ 7Q10W =
12.86307054
1WC% @ 30Q2 =
10.29900332
IW%C @ QA =
3.68608799
Stream Class:
C
COMBINED HARDNESS (me/L)
Acute = 51.91 mg/L
Chronic = 48.37 mg/L
PARAMETER
NC STANDARDS OR EPA CRITERIA
U)
REASONABLE POTENTIAL RESULTS
RECOMMENDED ACTION
TYPE
J
CY
a
D
Applied
Chronic Acute
n # Det. Max Pred Cw Allowable Cw
Standa
Acute (FW): 1,200.4
Arsenic
C
150 FW(7QlOs) 340
ug/L
30 30
234.3
_
Chronic (FW) 609.7
No RP, Predicted Max < 50% of Allowable Cw - No
No value > Allowable Cw
Monitoring required
Arsenic
C
10 HH/WS(Qavg)
ug/L
Chronic (HH) 271.3
No RP , Predicted Max >_ 50% of Allowable Cw -
No value > Allowable Cw
apply Quarterly Monitoring
Acute: 229.49
Beryllium
NC
6.5 FW(7Q10s) 65
ug/L
3 0
7.50
Note: n < 9
C.V. (default)
Chronic: 26.42
No RP, Predicted Max < 50% of Allowable Cw - No
Limited data set
NO DETECTS
Max MDL = 5
Monitoring required
Acute: 21.639
No detects, all < 5
Cadmium
NC
0.9715 FW(7Q10s) 6.1290
ug/L
19 0
2.500
Chronic: 3.949
No monitoring, shall report to targeted PQL
NO DETECTS
Max MDL = 5
Acute: NO WQS
Chlorides
NC
230 FW(7Q10s)
mg/L
18 18
468.0
_ _ _ _ _ _ _ _ _ _ _ _
Chronic: 934.8
_ _ _ _ _ _ _ _ _ _ _ _ _ _
No RP, Predicted Max < 50% of Allowable Cw - No
No value > Allowable Cw
Monitoring required
Acute: NO WQS
Total Phenolic Compounds
NC
300 A(30Q2)
ug/L
3 2
60.0
Note: n <_ 9
C.V. (default)
Chronic: 2,912.9
No RP, Predicted Max < 50% of Allowable Cw - No
Limited data set
No value > Allowable Cw
Monitoring required
Acute: 56.5
Chromium VI
NC
11 FW(7Q10s) 16
µg/L
0 0
N/A
--------------------------
Chromium, Total
NC
µg/L
3 0
7.5
Max reported value = 2.5
a: No monitoring required if all Total Chromium
samples are < 5 pg/L or Pred. max for Total Cr is <
Note n < 9
C.V. default
(default)
allowable Cw for Cr A.
Limited data set
NO DETECTS
Max MDL = 5
Acute: 73.59
Copper
NC
13.8521 FW(7Q10s) 20.8439
ug/L
30 16
15.00
_ _ _ _
C_
hronic: 56.30
No RP, Predicted Max < 50% of Allowable Cw - No
No value > Allowable Cw
Monitoring required
Acute: 77.7
Cyanide
NC
5 FW(7Q10s) 22
10
ug/L
30 3
14.3
_ C_ _ _
hronic: 2-0.-3-
_ _ _ _ _ _ _ _ _ _ C_ _
No RP ,Predicted Max 2-:5-0 % of Allowable w
No value > Allowable Cw
apply Quarterly Monitoring
RPA 4 MGD, rpa
Page 1 of 2 3/19/2019

Pilot Creek WWTP
NCO020737
Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators
Outfall 001
Qw=4MGD
Acute: 603.096
Lead
NC
6.1555 FW(7Q10s) 170.8175
ug/L
12 0
4.263
Chronic: 25.019
No RP, Predicted Max < 50% of Allowable Cw - No
NO DETECTS
Max MDL = 5.8
Monitoring required
Acute: NO WQS
Molybdenum
NC
2000 HH(7Q10s)
ug/L
10 10
15,607.4
Chronic: 8,129.0
RP shown - apply Monthly Monitoring with Limit
1 values > Allowable Cw
Acute (FW): 2,195.8
Nickel
NC
65.0767 FW(7Q10s) 621.9293
µg/L
12 12
75.0
_
Chronic (FW) 264.5
No RP, Predicted Max < 50% of Allowable Cw - No
No value > Allowable Cw
------------------------------
Monitoring required
Nickel
NC
25.0000 WS(7Q10s)
µg/L
Chronic (WS) 101.6
No value > Allowable Cw
Acute: 197.7
Selenium
NC
5 FW(7QlOs) 56
ug/L
13 7
278.4
Chronic: 20.3
RP shown - apply Monthly Monitoring with Limit
4 values > Allowable Cw
Acute: 3.677
No detects, 9 values < 5 ug/L, 3 values < 1 ug/L
Silver
NC
0.06 FW(7Q10s) 1.0414
ug/L
12 0
3.650
_ _ _ _ _ _ _ _ _ _ _ _
Chronic: 0.244
_ _ _ _ _ _ _ _ _ _ _ _ _ _
No monitoring, shall report to targeted PQL
NO DETECTS
Max MDL = 5
Acute: 824.2
Zinc
NC
221.7078 FW(7Q10s) 233.4487
ug/L
30 29
97.9
Chronic: 901.1
No RP, Predicted Max < 50% of Allowable Cw - No
No value > Allowable Cw
Monitoring required
Acute: NO WQS
Thallium
NC
2 HH(7Q10s)
µg/L
49 43
102.82000
Chronic: 8.12903
RP shown - apply Monthly Monitoring with Limit
35 values > Allowable Cw
Acute: NO WQS
Chlorodibromomethane
c
21 FW(7Q10s)
µg/L
3 3
54.60000
Note: n 5 9
C.V. (default)
Chronic: 85.35484
No RP, Limited Dataset (n<8) with no values >
Limited data set
No value > Allowable Cw
50% Allowable Cw - No Monitoring required
Acute: NO WQS
Chloroform
NC
2000 FW(7Q10s)
µg/L
3 3
75.30000
Note: n < 9
C.V. (default)
Chronic: 8129.03226
No RP, Predicted Max < 50% of Allowable Cw - No
Limited data set
No value > Allowable Cw
Monitoring required
Acute: NO WQS
Dichlorobromomethane
C
27 FW(7Q10s)
µg/L
3 3
28.80000
Note: n 5 9
C.V. (default)
Chronic: 109.74194
No RP, Predicted Max < 50% of Allowable Cw - No
Limited data set
No value > Allowable Cw
Monitoring required
RPA 4 MGD, rpa
Page 2 of 2 3/19/2019

Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators
MAXIMUM DATA POINTS = 58
REQUIRED DATA ENTRY
Table 1. Project Information
❑CHECK IF HQW OR ORW WQS
Facility Name
WWTP/WTP Class
NPDES Permit
Outfall
Flow, Qw (MGD)
Receiving Stream
HUC Number
Stream Class
Pilot Creek WWTP
IV
NCO020737
001
6.000
Buffalo Creek
03050105
C
❑Apply WS Hardness WQC
7Q10s (cfs)
7Q10w (cfs)
30Q2 (cfs)
QA (cfs)
1Q10s (cfs)
19.00
42.00
54.00
162.00
15.69
Effluent Hardness
Upstream Hardness _
Combined HardnessChronic
___
Combined Hardness Acute
120 mg/L (Avg)
_ _ _ _ 25 mg/L (Avg)
56.22 mg/L
_ _ _ _ _ _ _ _
_ _ 60.35 mg/L
Data Source(s)
❑CHECK TO APPLY MODEL
Follow directions for data entry. In some cases a
comment menu list the available choices or a
dropdown menu will provide a list you may select
from. Error message occur if data entry does not
meet input criteria.
Par01
Par02
Par03
Par04
Par05
Par06111111
Par07
Par08
Par09
Par10
Par19
Par12
Par13
Par14
Parts
Par16
Par17
Par18
Par19
Par20
Par21
Par22
Par23
Par24
Par25
Table 2. Parameters of Concern
Name w4s Type Chronic Modifier Acute PQL Units
Arsenic
Aquactic Life
C
150
FW
340
ug/L
Arsenic
Human Health
Water Supply
C
10
HH/WS
N/A
ug/L
Beryllium
Aquatic Life
NC
6.5
FW
65
ug/L
Cadmium
Aquatic Life
NC
1.0883
FW
6.9900
ug/L
Chlorides
Aquatic Life
NC
230
FW
Chlorinated Phenolic Compounds
Water supply
NC
1
A
ug/L
Total Phenolic Compounds
Aquatic Life
NC
300
A
ug/L
Chromium III
Aquatic Life
NC
228.6328
FW
1862.8336
ug/L
Chromium VI
Aquatic Life
NC
11
FW
16
lag/L
Chromium, Total
Aquatic Life
NC
N/A
FW
N/A
lag/L
Copper
Aquatic Life
NC
15.7506
FW
24.0255
ug/L
Cyanide
Aquatic Life
NC
5
FW
22
10
ug/L
Fluoride
Aquatic Life
NC
1,800
FW
ug/L
Lead
Aquatic Life
NC
7.2716
FW
201.8317
ug/L
Mercury
Aquatic Life
NC
12
FW
0.5
ng/L
Molybdenum
Human Health
NC
2000
HH
ug/L
Nickel
Aquatic Life
NC
73.9015
FW
706.5391
lag/L
Nickel
Water Supply
NC
25.0000
WS
N/A
lag/L
Selenium
Aquatic Life
NC
5
FW
56
ug/L
Silver
Aquatic Life
NC
0.06
FW
1.3497
ug/L
Zinc
Aquatic Life
NC
251.8218
FW
265.2600
ug/L
Thallium
Human Health
NC
2
HH
lag/L
Chlorodibromomethane
Aquatic Life
C
21
FW
lag/L
Chloroform
Aquatic Life
NC
2000
FW
lag/L
Dichlorobromomethane
Aquatic Life
C
27
FW
lag/L
Copy of RPA 6 MGD, input
3/19/2019

Pilot Creek WWTP - Outfall 001
NCO020737 Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators Qw = 6 MGD
MAXIMUM
Qw (MGD) =
6.0000
1Q10S (cfs) =
15.69
7Q10S (cfs) =
19.00
7Q10W (cfs) =
42.00
30Q2 (cfs) =
54.00
Avg. Stream Flow, QA (cfs) =
162.00
Receiving Stream:
Buffalo Creek HUC 03050105
DATA POINTS = 58
WWTP/WTP Class: IV
IWC% @ 1Q10S =
37.21488595
1WC% @ 7Q10S =
32.86219081
IWC% @ 7Q10W =
18.12865497
1WC% @ 30Q2 =
14.69194313
IW%C @ QA =
5.429071804
Stream Class:
C
COMBINED HARDNESS (me/L)
Acute = 60.35 mg/L
Chronic = 56.22 mg/L
PARAMETER
NC STANDARDS OR EPA CRITERIA
REASONABLE POTENTIAL RESULTS
RECOMMENDED ACTION
TYPE
o_
Applied
Chronic Acute
n # Det. Max Pred Cw Allowable Cw
Standa
Acute (FW): 913.6
Arsenic
C
150 FW(7Q10s) 340
ug L
30 30
234.3
_
Chronic (FW) 456.5
No value > Allowable Cw
Arsenic
C
10 HH/WS(Qavg)
ug/L
_
Chronic (HH) 184.2
RP shown -apply Monthly Monitoring with Limit
2 values > Allowable Cw
Acute: 174.66
Beryllium
NC
6.5 FW(7Q10s) 65
ug/L
3 0
7.50
Note: n < 9
C.V. (default)
Chronic: 19.78
No RP, Predicted Max < 50% of Allowable Cw - No
Limited data set
NO DETECTS
Max MDL = 5
Monitoring required
Acute: 18.783
No detects, all < 5
Cadmium
NC
1.0883 FW(7Q10s) 6.9900
ug/L
19 0
2.500
---------------------------------------------
Chronic: 3.312
No monitoring, shall report to targeted PQL
NO DETECTS
Max MDL = 5
Acute: NO WQS
Chlorides
NC
230 FW(7Q10s)
mg/L
18 18
468.0
_ C_ _ _
hronic: 699.9
_
No RP , Predicted Max 2 50% of Allowable Cw
No value > Allowable Cw
apply Quarterly Monitoring
Acute: NO WQS
Total Phenolic Compounds
NC
300 A(30Q2)
ug/L
3 2
60.0
Note: n < 9
C.V. (default)
Chronic: 2,041.9
No RP, Predicted Max < 50% of Allowable Cw - No
Limited data set
No value > Allowable Cw
Monitoring required
Acute: 43.0
Chromium VI
NC
11 FW(7Q10s) 16
µg/L
0 0
N/A
--Chronic:-----33-5 --
--------------------------
Chromium, Total
NC
µg/L
3 0
7.5
Max reported value = 2.5
a: No monitoring required if all Total Chromium
samples are < 5 pg/L or Pred. max for Total Cr is <
Note n < 9
C.V. default
(default)
allowable Cw for Cr VI.
Limited data set
NO DETECTS
Max MDL = 5
Acute: 64.56
Copper
NC
15.7506 FW(7Q10s) 24.0255
ug/L
30 16
15.00
_ _ _ _ _
C_
hronic: 47.93
No RP, Predicted Max < 50% of Allowable Cw - No
No value > Allowable Cw
Monitoring required
Acute: 59.1
Cyanide
NC
5 FW(7Q10s) 22
10
ug/L
30 3
14.3
___ _ ______ ___
_ _ _ _ _ _ _ _ _ _ _ _
Chronic: 15.2
_
No RP ,Predicted Max 2 50% of Allowable Cw
No value > Allowable Cw
apply Quarterly Monitoring
RPA 6 MGD, rpa
Page 1 of 2 3/19/2019

Pilot Creek WWTP
NCO020737
Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators
Outfall 001
Qw = 6 MGD
Acute: 542.341
Lead
NC
7.2716 FW(7Q10s) 201.8317
ug/L
12 0
4.263
Chronic: 22.128
No RP, Predicted Max < 50% of Allowable Cw - No
NO DETECTS
Max MDL = 5.8
Monitoring required
Acute: NO WQS
Molybdenum
NC
2000 HH(7Q10s)
ug/L
10 10
15,607.4
Chronic: 6,086.0
RP shown - apply Monthly Monitoring with Limit
1 values > Allowable Cw
Acute (FW): 1,898.5
Nickel
NC
73.9015 FW(7Q10s) 706.5391
µg/L
12 12
75.0
_
Chronic (FW) 224.9
No RP, Predicted Max < 50% of Allowable Cw - No
No value > Allowable Cw
------------------------------
Monitoring required
Nickel
NC
25.0000 WS(7Q10s)
µg/L
Chronic (WS) 76.1
No value > Allowable Cw
Acute: 150.5
Selenium
NC
5 FW(7Q10s) 56
ug/L
13 7
278.4
Chronic: 15.2
RP shown - apply Monthly Monitoring with Limit
4 values > Allowable Cw
Acute: 3.627
No detects, 9 values < 5 ug/L, 3 values < 1 ug/L
Silver
NC
0.06 FW(7Q10s) 1.3497
ug/L
12 0
3.650
_ _ _ _ _ _ _ _ _ _ _ _
Chronic: 0.183
_ _ _ _ _ _ _ _ _ _ _ _ _ _
No monitoring, shall report to targeted PQL
NO DETECTS
Max MDL = 5
Acute: 712.8
Zinc
NC
251.8218 FW(7Q10s) 265.2600
ug/L
30 29
97.9
Chronic: 766.3
No RP, Predicted Max < 50% of Allowable Cw - No
No value > Allowable Cw
Monitoring required
Acute: NO WQS
Thallium
NC
2 HH(7Q10s)
µg/L
49 43
102.82000
Chronic: 6.08602
RP shown - apply Monthly Monitoring with Limit
39 values > Allowable Cw
Acute: NO WQS
Chlorodibromomethane
c
21 FW(7Q10s)
µg/L
3 3
54.60000
Note: n 5 9
C.V. (default)
_ _ _ _ _ _ _ _
Chronic: 63.90323
_ _ _ _ _ _ _ _ _ _ _ _ _
No RP, Limited Dataset (n<8) with no values >
Limited data set
No value > Allowable Cw
50% Allowable Cw - No Monitoring required
Acute: NO WQS
Chloroform
NC
2000 FW(7Q10s)
µg/L
3 3
75.30000
Note: n 5 9
C.V. (default)
Chronic: 6086.02151
No RP, Predicted Max < 50% of Allowable Cw - No
Limited data set
No value > Allowable Cw
Monitoring required
Acute: NO WQS
Dichlorobromomethane
C
27 FW(7Q10s)
µg/L
3 3
28.80000
Note: n < 9
C.V. (default)
Chronic: 82.16129
No RP, Predicted Max < 50% of Allowable Cw - No
Limited data set
No value > Allowable Cw
Monitoring required
RPA 6 MGD, rpa
Page 2 of 2 3/19/2019

REASONABLE POTENTIAL ANALYSIS
H1
Use "PASTE SPECIAL
H2
Use I.P. SPECIAL
Par01 & Par02
Use "PASTE SPECIAL
Par03
Use "PASTE SPECIAL
Beryllium
Values" than "COPY".
Effluent Hardness
Values" then "COPY".
Upstream Hardness
Values" then "COPY" .
Arsenic
slues" than "COPY".
exlmvmaaeapeinea
Maximum data points
Maximum data points
n
Maximumdd"COPY"S
58
= 58
58
= 58
Date Data
BDL=1/2DL
Results
Date
Data
BDL=1/2DL
Results
Date
Data
BDL=1/2DL
Results
Date Data
BDL=1/2DL
Results
1
10/15/2015
100
100
Std Dev.
20.0000
1
25
25
Std Dev.
N/A
1 5/8/2015
91
91
Std Dev.
46.0457
1 10/15/2015 <
5 2.5
Std Dev.
1.1547
2
10/13/2016
120
120
Mean
120.0000
2
Mean
25.0000
2 5/14/2015
110
110
Mean
98.2667
2 10/13/2016 <
1 0.5
Mean
1.1667
3
7/20/2017
140
140
C.V. (default)
0.6000
3
C.V.
0.0000
3 5/21/2015
110
110
C.V.
0.4686
3 7/20/2017 <
1 0.5
C.V.(default)
0.6000
4
n
3
4
n
1
4 5/28/2015
95
95
n
30
4
n
3
5
10th Per value
104.00 mg/L
5
10th Per value
25.00 mg/L
5 6/4/2015
97
97
5
6
Average Value
120.00 mg/L
6
Averaqe Value
25.00 mg/L
6 7/16/2015
46
46
Mult Factor =
1.16
6
Mult Factor =
3.00
7
Max. Value
140.00 mg/L
7
Max. Value
25.00 mg/L
7 9/10/2015
45
45
Max. Value
202.0 ug/L
7
Max. Value
2.50 ug/L
8
8
8 10/15/2015
44
44
Max. Pred Cw
234.3 ug/L
8
Max. Pred Cw
7.50 ug/L
9
9
9 4/14/2016
78
78
9
10
10
10 5/12/2016
73
73
10
11
11
11 6/9/2016
42
42
11
12
12
12 7/14/2016
89
89
12
13
13
13 8/4/2016
90
90
13
14
14
14 9/8/2016
62
62
14
15
15
15 10/13/2016
58
58
15
16
16
16 4/13/2017
73
73
16
17
17
17 5/4/2017
65
65
17
18
18
18 6/15/2017
202
202
18
19
19
19 7/20/2017
155
155
19
20
20
20 8/10/2017
105
105
20
21
21
21 9/7/2017
40
40
21
220
22
22 10/12/2017
51
51
22
23
23
23 4/19/2018
120
120
23
24
24
24 5/3/2018
180
180
24
25
25
25 5/22/2018
200
200
25
26
26
26 6/7/2018
140
140
26
27
27
27 7/19/2018
150
150
27
28
29
28
29
28 8/9/2018
29
140
187
140
187
28
29
30
30
0/18/201
30 10/18/2018
87
87
30
JW
31
31
31
31
32
32
1 32
32
Par04
Par05
Par07
.."PASTE SPECIAL
Par10
Use "PASTE SPECIAL
Cadmium
Chlorides
Total PhenolicComuounds
aluae"than "COPY".
Maximum do. points
Chromium. Total
Valnaa"than "COPY".
Mazim um data points
Date Data
BDL=1/2DL
Results
Date
Data
BDL=1/2DL
Results
Date
Data
BDL=1/2DL
Results
=58
Date Data
BDL=1/2DL
Results
`58
1
5/8/2015 <
5
2.5
Std Dev.
0.0000
1
5/8/2015
255
255
Sid Dev.
65.3110
1 10/15/2015
< 10
5
Std Dev.
7.6376
1 10/15/2015 <
5 2.5
Std Dev.
0.0000
2
5/14/2015 <
5
2.5
Mean
2.5000
2
5/21/2015
301
301
Mean
251.3
2 10/13/2016
20
20
Mean
11.6667
2 10/13/2016 <
5 2.5
Mean
2.5000
3
5/21/2015 <
5
2.5
C.V.
0.0000
3
7/16/2015
258
258
C.V.
0.2599
3 7/20/2017
10
10
C.V. (default)
0.6000
3 7/20/2017 <
5 2.5
C.V. (default)
0.6000
4
5/28/2015 <
5
2.5
n
19
4
10/15/2015
129
129
n
18
4
n
3
4
n
3
5
6/4/2015 <
5
2.5
5
4/14/2016
220
220
5
5
6
9/10/2015 <
5
2.5
Mult Factor =
1.00
6
5/12/2016
250
250
Mult Factor =
1.2
6
Mult Factor =
3.00
6
Mult Factor =
3.00
7
10/15/2015 <
5
2.5
Max. Value
2.500 ug/L
7
6/9/2016
137
137
Max. Value
400.0 mg/L
7
Max. Value
20.0 ug/L
7
Max. Value
2.5 pg/L
8
4/14/2016 <
5
2.5
Max. Fred Cw
2.500 ug/L
8
7/14/2016
176
176
Max. Pred Cw
468.0 mg/L
8
Max. Fred Cw
60.0 ug/L
8
Max. Pred Cw
7.5 pg/L
9
5/12/2016 <
5
2.5
9
8/4/2016
306
306
9
9
10
6/9/2016
5
2.5
10
9/8/2016
191
191
10
10
11
7/14/2016 <
5
2.5
11
10/13/2016
278
278
11
12
8/4/2016 <
5
2.5
12
5/4/2017
260
260
12
13
9/8/2016 <
5
2.5
13
6/15/2017
313
313
13
14
10/13/2016 <
5
2.5
14
7/20/2017
400
400
14
15
4/13/2017 <
5
2.5
15
10/12/2017
280
280
15
16
5/4/2017 <
5
2.5
16
4/19/2018
270
270
16
17
6/15/2017 <
5
2.5
17
7/19/2018
270
270
17
18
7/20/2017 <
5
2.5
18
10/18/2018
230
230
18
19
8/10/2017 <
5
2.5
19
19
20
20
20
21
21
21
Copy of RPA 6 MGD, data print
- 1 - 3/19/2019

REASONABLE POTENTIAL ANALYSIS
Pall
Use "PASTE SPECIAL
Part 2
Cyanide
Use "PASTE SPECIAL
Values"then•'COPv".
Par14
Use "PASTE SPECIAL
Par16
Molybdenum
Use "PASTE SPECIAL
values•' then "COPY".
Copper Values"then ••Copy".
Lead Values•• then "COPY".
Maximum data points
Maximum data points
Maximum data points
Maximum data points
Date Data
BDL=1/2DL
Results
Lm - 8
Date Data
BDL=112DL
Results
=58
Date
BDL=1/2DL
Results
=58
Date
Data
BDL=1/2DL
Results
=58
1
10/18/2018
3.1
3.1
Std Dev.
3.1218
1 5/8/2015 <
8
5
Std Dev.
1.4606
1
5/21/2015 <
5
2.5
Std Dev.
0.9316
1
7/16/2015
4196
4196
Std Dev.
2198.8535
2
9/6/2018
3.8
3.8
Mean
5.4167
2 5/14/2015 <
8
5
Mean
5.27
2
10/15/2015 <
5
2.5
Mean
2.0333
2
10/15/2015
9459
9459
Mean
4115.5000
3
8/9/2018
4.1
4.1
C.V.
0.5763
3 5/21/2015 <
8
5
C.V.
0.2773
3
4/14/2016 <
5.8
2.9
C.V.
0.4582
3
4/14/2016
2300
2300
C.V.
0.5343
4
7/19/2018 <
25
12.5
n
30
4 5/28/2015 <
8
5
n
30
4
5/12/2016 <
5
2.5
n
12
4
5/12/2016
4271
4271
In
10
5
6/7/2018
4.6
4.6
5 6/4/2015 <
8
5
5
6/9/2016 <
5
2.5
5
6/9/2016
4516
4516
6
5/3/2018 <
5
2.5
Mult Factor =
1.20
6 7/16/2015 <
8
5
Mult Factor =
1.10
6
7/14/2016 <
5
2.5
Mult Factor =
1.47
6
7/14/2016
4590
4590
Mult Factor =
1.65
7
4/19/2018 <
5
2.5
Max. Value
12.50 ug/L
7 8/6/2015 <
8
5
Max. Value
13.0 ug/L
7
4/13/2017 <
5
2.5
Max. Value
2.900 ug/L
7
4/13/2017
1708
1708
Max. Value
9459.0 ug/L
8
10/12/2017 <
2
1
Max. Pred Cw
15.00 ug/L
8 9/10/2015 <
8
5
Max. Pred Cw
14.3 ug/L
8
7/20/2017 <
5
2.5
Max. Pred Cw
4.263 ug/L
8
7/20/2017
3778
3778
Max. Pred Cw
15607.4 ug/L
9
9/7/2017
3.4
3.4
9 10/15/2015
8
5
9
10/12/2017 <
5
2.5
9
10/12/2017
1837
1837
10
8/10/2017
9
9
10 4/14/2016 <
8
5
10
4/19/2018 <
1
0.5
10
7/19/2018
4500
4500
11
7/20/2017 <
5
2.5
11 5/12/2016 <
8
5
11
7/19/2018 <
1
0.5
11
12
6/15/2017
7
7
12 6/9/2016
9
5
12
10/18/2018 <
1
0.5
12
13
5/4/2017
8
8
13 7/14/2016 <
8
5
13
130
14
4/13/2017 <
5
2.5
14 8/4/2016 <
8
5
14
14
15
10/13/2016 <
5
2.5
15 9/8/2016 <
8
5
15
15
16
9/8/2016 <
5
2.5
16 10/13/2016 <
8
5
16
16
17
8/4/2016 <
5
2.5
17 4/13/2017 <
8
5
17
17
18
7/14/2016
11
11
18 5/4/2017 <
8
5
18
18
19
6/9/2016
11
11
19 6/15/2017 <
8
5
19
19
20
5/12/2016 <
5
2.5
20 7/20/2017 <
8
5
20
20
21
4/14/2016
6
6
21 8/10/2017 <
8
5
21
21
22
10/15/2015
6
6
22 9/7/2017 <
8
5
22
22
23
9/10/2015
5
5
23 10/12/2017 <
8
5
23
23
24
8/6/2015
10
10
24 4/19/2018
13
13
24
24
25
7/16/2015
7
7
25 5/3/2018 <
10
5
25
25
26
6/4/2015
10
10
26 6/7/2018 <
10
5
26
26
27
5/28/2015 <
10
5
27 7/19/2018 <
10
5
27
27
28
5/21/2015 <
10
5
28 8/9/2018 <
10
5
28
28
29
5/14/2015 <
10
5
29 9/6/2018 <
10
5
29
29
30
5/8/2015 <
10
5
30 10/18/2018 <
10
5
30
30
31
31
31
31
Par17 & Par18
Use "PASTE SPECIAL
Part
Use "PASTE SPECIAL
Par2O
Use "PASTE SPECIAL
Par21
Zinc
Use ••PASTE SPECIAL
Values"then •'copy.
Nickel Values•• then "COPY".
Selenium values•' then •'COPY••.
Silver Values"ihen•'COPY•'.
Maximum tlata points
Mazimum data points
Maximum date points
Mazimum data points
Date Data
BDL=1/2DL
Results
=58
Date Data
BDL=1/2DL
Results
=58
Date Data
BDL=1/2DL
Results
=58
Date Data
BDL=1/2DL
Results
=sa
1 5/21/2015
60
60
Std Dev.
9.7685
1 5/21/2015
24
24
Std Dev.
41.2764
1 5/21/2015 <
5 2.5
Std Dev.
0.9045
1 5/8/2015
68
68
Std Dev.
20.4685
2 10/15/2015
42
42
Mean
37.1667
2 7/16/2015
104
104
Mean
28.5692
2 10/15/2015 <
5 2.5
Mean
2.0000
2 5/14/2015
77
77
Mean
39.7833
3 4/14/2016
41
41
C.V.
0.2628
3 10/15/2015 <
10
5
C.V.
1.4448
3 4/14/2016 <
5 2.5
C.V.
0.4523
3 5/21/2015
76
76
C.V.
0.5145
4 5/12/2016
41
41
n
12
4 4/14/2016 <
10
5
n
13
4 5/12/2016 <
5 2.5
n
12
4 5/28/2015
76
76
n
30
5 6/9/2016
39
39
5 5/12/2016
14
14
5 6/9/2016 <
5 2.5
5 6/4/2015
83
83
6 7/14/2016
40
40
Mult Factor =
1.25
6 6/9/2016 <
10
5
Mult Factor =
2.40
6 7/14/2016 <
5 2.5
Mult Factor =
1.46
6 7/16/2015
59
59
Mult Factor =
1.18
7 4/13/2017
42
42
Max. Value
60.0 pg/L
7 7/14/2016 <
10
5
Max. Value
116.0 ug/L
7 4/13/2017 <
5 2.5
Max. Value
2.500 ug/L
7 8/6/2015
58
58
Max. Value
83.0 ug/L
8 7/20/2017
26
26
Max. Pred Cw
75.0 pg/L
8 4/13/2017
116
116
Max. Pred Cw
278.4 ug/L
8 7/20/2017 <
5 2.5
Max. Pred Cw
3.650 ug/L
8 9/10/2015
48
48
Max. Pred Cw
97.9 ug/L
9 10/12/2017
33
33
9 7/20/2017
11
11
9 10/12/2017 <
5 2.5
9 10/15/2015
46
46
10 4/19/2018
29
29
10 10/12/2017
76
76
10 4/19/2018 <
1 0.5
10 4/14/2016
52
52
11 7/19/2018
28
28
11 4/19/2018 <
5
2.5
11 7/19/2018 <
1 0.5
11 5/12/2016
39
39
12 10/18/2018
25
25
12 7/19/2018 <
5
2.5
12 10/18/2018 <
1 0.5
12 6/9/2016
37
37
13
13 10/18/2018
1.4
1.4
13
13 7/14/2016
39
39
14
14
14
14 8/4/2016
32
32
15
15
15
15 9/8/2016
24
24
16
16
16
16 10/13/2016
29
29
17
17
17
17 4/13/2017
33
33
18
18
18
18 5/4/2017
30
30
19
19
19
19 6/15/2017 <
5
2.5
20
20
20
20 7/20/2017
12
12
21
21
21
21 8/10/2017
20
20
22
22
22
22 9/7/2017
23
23
23
23
23
23 10/12/2017
32
32
24
24
24
24 4/19/2018
38
38
25
25
25
25 5/3/2018
27
27
26
26
26
26 6/7/2018
27
27
27
27
27
27 7/19/2018
27
27
28
28
28
28 8/9/2018
29
29
29
29
29
29 9/6/2018
24
24
30
30
30
30 10/18/2018
26
26
31
31
31
31
Copy of RPA 6 MGD, data print
-2-
3/19/2019

REASONABLE POTENTIAL ANALYSIS
Use"PASTE SPECIAL
Thallium
Values"then "COPY".
Maximum data points
Date Data
BDL=1/2DL
Results
=5a
5/8/2015 <
10
5
Std Dev.
26.2842
5/14/2015 <
10
5
Mean
33.2184
5/21/2015 <
10
5
C.V.
0.7913
5/28/2015 <
10
5
It
49
6/4/2015
33.9
33.9
7/16/2015
25
25
Mult Factor =
1.06
8/6/2015
32
32
Max. Value
97.000000 pg/L
9/10/2015
22
22
Max. Fred Cw 102.820000 pg/L
10/15/2015
17
17
4/14/2016
24.4
24.4
5/5/2016
32.8
32.8
5/12/2016
35.05
35.05
5/19/2016
38.1
38.1
5/26/2016 <
10
5
6/2/2016
11
11
6/9/2016
76
76
6/16/2016
97
97
6/23/2016
86
86
6/30/2016
73
73
7/7/2016 <
10
5
7/14/2016
64.4
64.4
7/21/2016
51
51
7/28/2016
49
49
8/4/2016
60
60
8/11/2016
87
87
8/18/2016
77
77
8/25/2016
66
66
9/1/2016
59
59
9/8/2016
41
41
9/15/2016
51
51
9/22/2016
39
39
9/29/2016
52
52
10/6/2016
44
44
10/13/2016
10.95
10.95
10/20/2016
36
36
4/13/2017
34.1
34.1
5/4/2017
36.9
36.9
6/15/2017
31.7
31.7
7/20/2017
30.3
30.3
8/10/2017
19.4
19.4
9/7/2017
7.4
7.4
10/12/2017
5.3
5.3
4/19/2018
5.4
5.4
5/3/2018
7.4
7.4
6/7/2018
6.9
6.9
7/19/2018
6.1
6.1
8/9/2018
9
9
9/6/2018
4.5
4.5
10/18/2018
2.7
2.7
Use"PASTE SPECIAL
Chlorodibromomethane
Values"then"COPY".
Maximum data points
Date
Data BDL=1/2DL
Results
-ss
10/15/2015
16.2 16.2
Std Dev.
5.3482
10/13/2016
18.2 18.2
Mean
14.1667
7/20/2017
8.1 8.1
C.V. (default)
0.6000
n
3
Mult Factor =
3.00
Max. Value 18.200000 pg/L
Max. Fred Cw 54.600000 pg/L
Use"PASTE SPECIAL
Chloroform Values"then "COPY"
Maximum data points
Date Data BDL=II2DL Results =5a
1 10/15/2015 25.1 25.1 Std Dev. 10.6758
2 10/13/2016 3.9 3.9 Mean 15.2333
3 7/20/2017 16.7 16.7 C.V. (default) 0.6000
4 It 3
5
6 Mult Factor = 3.00
7 Max. Value 25.100000 pg/L
8 Max. Pred Cw 75.300000 pg/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
Use"PASTE SPECIAL
Dichlorobromomethane
Values" then "COPY"
I
Maximum data points
Date
Data BDL=1/2DL
Results
= -
1 10/15/2015
7.3 7.3
Std Dev.
1.2288
2 10/13/2016
7.7 7.7
Mean
8.2000
3 7/20/2017
9.6 9.6
C.V. (default)
0.6000
4
n
3
5
6
Mult Factor =
3.00
7
Max. Value
9.600000 pg/L
8
Max. Fred Cw
28.800000 pg/L
9
10
11
12
13
14
15
16
17
18
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
IBM
Copy of RPA 6 MGD, data print
3/19/2019

NPDES/Aquifer Protection Permitting Unit Pretreatment Information Request Form
PERMIT WRITER COMPLETES THIS PART:
Check all that
PERMIT WRITERS - AFTER you pet this form back
apply
from PERCS:
Notifyy PERCS if LTMP/STMP data we said should be
on DMRs is not really there, so we can get it for you
(or NOV POTW).
- Notify PERCS if you want us to keep a specific POC
in LTMP/STMP so you will have data for next permit
renewal.
- Email PERCS draft permit, fact sheet, RPA.
- Send PERCS paper copy of permit (w/o NPDES
boilerplate), cover letter, final fact sheet. Email RPA if
changes.
Date of Request
3/18/2019
municipal renewal
X
Requestor
Bing Bai
new industries
Facility Name
Pilot Creek WWTP
WWTP expansion
Permit Number
NCO020737
Speculative limits
Region
Mooresville
stream reclass.
Basin
Broad
outfall relocation
7Q10 change
other
other
check applicable PERCS staff:
Other Comments to PERCS:
Facility is rated for 6 MGD wtih 6 CIUs listed in its application:
Steag Scr-Tech
Commercial Vehicle Group (CVG) - Mayflower
Kings Mountains International, Inc.
Carolina Finishing and Coating
Buckeye Anodizing company
BRD, CPF, CTB, FRB, TAR
X
Vivien Zhon 807-6310
CHO, HIW, LTN, LUM, NES, NEW, ROA, YAD
Monti Hassan (807-6314)
PERCS PRETREATMENT STAFF COMPLETES THIS PART:
Status of Pretreatment Program (check all that apply)
1) facility has no SIU's, does have Division approved Pretreatment Program that is INACTIVE
2) facility has no SIU's, does not have Division approved Pretreatment Program
3) facility has SIUs and DWQ approved Pretreatment Program (list "DEW if program still under development)
X 3a) Full Program with LTMP
3b) Modified Program with STMP
4) additional conditions regarding Pretreatment attached or listed below
Flow, MGD
Permitted
Actual
Time period for Actual
STMP time frame:
Industrial
1.785
I
0.171
2015
Most recent:
Uncontrollable
n/a
1.4235
2015
Next Cycle:
a
a
u y
a
Parameter of
Concern (POC)
Check List
POC due to
NPDES/ Non-
Disch Permit
Limit
Required by
EPA*
Required
by 503
Sludge**
POC due
to SIU***
POTW POC
(Explain
below)****
STMP
Effluent
Freq
LTMP
Effluent
Freq
Q= Quarterly
M= Monthly
X
BOD
X
Landfill
N/A
X
N/A
Q
X
TSS
X
X
Q
X
NH3
X
X
Q
X
Arsenic
X
X
Q
X
Cadmium
X
Q
X
Chromium
X
Q
X
lCopper
X
X
Q
X
Cyanide
X
X
Q
Is all data on DMRs?
X
Lead
X
Q
YES
X
X
Mercury
X
X
Q
NO (attach data)
Molybdenum
Q
X
Nickel
X
Q
X
Silver
X
Q
Selenium
Q
X
Zinc
X
X
Q
Is data in spreadsheet?
Total Nitrogen
Q
YES email to writer
X
Phosphorus
X
Q
NO
IX
X
Thallium
X
X
Q
(dif POCs for incinerators)
still of concern to POTW
X
Chloride
X
Q
Q
Q
*Always
*** Only
in the LTMP/STMP
in LTMP/STMP while
SIU still discharges
to POTW
** Only in LTMP/STMP
**** Only
if sludge land
in LTMP/STMP
app or
when
composte
pollutant is
Comments to Permit Writer (ex., explanation of any POCs; info you have on IU related investigations into NPDES problems):
Let me know if you need more recent data.
KM NPDES_Pretreatmentrequestform
Revised: July 24, 2007