NC0026646_Fact Sheet_20201019

Fact Sheet
NPDES Permit No. NCO026646
Permit Writer/Email Contact: Gary Perlmutter, gar perlmutter&ncdenr.gov.
Date: August 26, 2020
Division/Branch: NC Division of Water Resources/NPDES Complex Permitting
Fact Sheet Template: Version 09Jan2017
Permitting Action:
0 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 Pilot Mountain/Pilot Mountain WWTP
Applicant Address:
124 West Main Street, Pilot Mountain, NC 27401
Facility Address:
601 Lynchburg Road, Pilot Mountain, NC 27401
Permitted Flow:
0.511.5 MGD
Facility Type/Waste:
MINOR Municipal: 100% Domestic
Facility Class:
Grade 11/III
Treatment Units:
Grit Removal, Fine Screen, Activated Sludge System (Aeration,
Clarifiers), Chlorine Disinfection, De -chlorination, Post -aeration
Pretreatment Program (Y/N)
No
County:
Surry
Region
Winston-Salem
Briefly describe the proposed permitting action and facility background: The Town of Pilot Mountain has
applied for NPDES permit renewal, and submitted a renewal application dated August 14, 2018 to DWR,
received on August 22, 2018. The application was found lacking the four required tad species toxicity
reports. Sampling was requested to the ORC and reports were subsequently received from samples collected
in May, June, July, and August 2020.
Page 1 of 14

This facility serves a total population of 1450 residents, and has no approved pretreatment program as it
treats 100% domestic wastewater. The Pilot Mountain WWTP has a capacity of 1.5 MGD but operates at
0.5 MGD. If the annual flow increases over 90% of 0.5 MGD (0.45 MGD), the Permittee shall obtain
authorization from the Division to operate at the 1.5 MGD flow. In the application, the Town does not
expect to go to the higher flow rate in the near future.
2. Receiving Waterbody Information
Receiving Waterbody Information
Outfalls/Receiving Stream(s):
Outfall 001/Ararat River
Stream Segment:
12-72-(4.5)b
Stream Classification:
C
Drainage Area (mi):
287
Summer 7Q 10 (cfs)
82.2
Winter 7Q10 (cfs):
163
30Q2 (cfs):
Average Flow (cfs):
379
IWC (% effluent):
1% at 0.5 MGD
3% at 1.5 MGD
303(d) listed/parameter:
None
Subject to TMDL/parameter:
Statewide TMDL for Mercury
Subbasin/HUC:
03-07-03/03040101
USGS Topo Quad:
F16SE/Siloam, NC
3. Effluent Data Summary
Effluent data is summarized in Table 1 for the period of April 2016 through March 2020.
Table 1. Effluent Data Summary.
Parameter
Units
Average
Max
Min
Limit'
Flow
MGD
0.164 Z
0.699
0.057
MA = 0.5
BOD5
mg/L
4.64
35.50
< 2.00
MA = 30.0
WA = 45.0
BOD5 removal
%
97.2
99.3
88.3
> 85
Total Suspended Solids
mg/L
7.54
36.7
< 2.5
MA = 30.0
(TSS)
WA = 45.0
TSS removal
%
88.8
97.3
61.8
> 85
Ammonia-N (NH3-N)
mg/L
2.12
17.50
< 0.10
MA = 28.6
(April 1- October 31)
WA = 35.0
Parameter
Units
Average
Max
Min
Limit'
Page 2 of 14

Ammonia-N (NH3-N)
mg/L
3.01
< 0.10
Monitor &
(November 1 — March 31)
Report
Dissolved Oxygen (DO)
mg/L
7.45
11.06
5.27
DA > 5.0
Fecal Coliform
#/100 mL
2
?115n
< I
MA = 200
(geometric mean)
WA = 400
Temperature
°C
26.9
4.V
Monitor &
Report
Oil & Grease
mg/L
All values < 5 mg/L
Monitor &
Report
Total Nitrogen
mg/L
9.91
1.01
Monitor &
(NO2 + NO3 + TKN)
Report
Total Phosphorus (TP)
mg/L
2.11
0.10
Monitor &
Report
pH
SU
6.93
7.50
6.60
6.0 - 9.0
Total Copper
µg/L
135
31h
12
Monitor &
Report
Total Zinc
µg/L
56
178
10
Monitor &
Report
Total Residual Chlorine
µg/L
13
18
9
DM = 28 3
(TRC)
Footnotes:
1. MA = Monthly Average; WA = Weekly Average; DM = Daily Maximum; DA = Daily Average.
2. For the calendar year 2019 effluent flow averaged 0.203 MGD, 41 % of the permitted flow.
3. Compliance level is 50 µg/L.
A pattern was found among the Fecal Coliform data, which are monitored weekly for this Class II facility
per 15A NCAC 02B .0508: when a high value (e.g., > 2420 cfu/100 mL) was recorded, a second sample
was collected and tested 2-3 days later, yielding a low value (most often < 1 cfu/100 mL). The resulting
geometric mean for the week is then below the 400 cfu/100 mL limit. Not all high values were followed
by a second sampling, yielding three exceedences: in June 2016, March and April 2018 (Figure 1).
Page 3 of 14

Fecal Coliform
WkAvg ■ Mo Avg WA Limit - — — MA Limit
i[I:II1
10
ay�
ly�'��oyy
1
�3y,�oy�
y
ly�,�oy�
3��,�oy�
�`i���oy�
�
�lya,�oy� ol���y�
y
�oy�
5
y
I �y%0'
Figure 1. Monthly and weekly geometric mean effluent Fecal Coliform data from
submitted DMRs. Weekly data are raw unless two samples were collected in a
given week, when a geometric mean was calculated.
Comments in the DMRs for these months acknowledge the exceedences, explaining that each was due to
mechanical failures, which were subsequently repaired.
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 beproposedfor this permit
action: The current permit requires instream monitoring for DO, Fecal Coliform, Temperature and
Conductivity. The upstream location in the current permit is at least 100 ft upstream from the outfall and
the downstream location is approximately 0.4 miles at NCSR 2044. The Permittee is a member of the
Yadkin Pee Dee River Basin Association (YPDRBA); collected data are from YPDRBA stations Q 1500000
— Ararat River at NC 52 near Mt Airy (upstream) and Q1935000 — Ararat River at SR 2044 near Pilot
Mountain (downstream).
Instream data were requested from the DWR Water Sciences Section's Monitoring Coalition Coordinator
for review. Data were reviewed from April 2016 through December 2019, and were compared against state
water quality standards where applicable. As the data were sampled synchronously at both locations, up- to
downstream differences were tested by paired two -sample t-test for means with the significance level (p-
value) set at 0.05. Instream data review findings for each parameter are summarized below.
Dissolved Oxygen (DO) — DO remains in the permit as a parameter of concern for aquatic life. The receiving
stream segment of the Ararat River is meeting the criteria for DO (4 mg/L for aquatic life in freshwater)
according to the Final 2018 Integrated Report. Reviewed instream DO data showed seasonal patterns of
summer lows and winter highs. Instream summer minima were above the 5 mg/L daily average water
quality standard for non -trout waters (15A NCAC 02B .0211) at both locations. Downstream DO was
Page 4 of 14

slightly higher (average = 8.5 mg/L; range: 6.5-11.7 mg/L) than that upstream (average = 8.2 mg/L; range:
6.3-11.8 mg/L), but tested higher on average (t-test, p < 0.0001). Concurrent effluent DO averaged 7.1
mg/L, lower than either instream average with a lower range of 5.3-10.7 mg/L. Effluent is not impacting
the receiving water DO.
Temperature — Temperature remains in the permit as a parameter of concern for aquatic life. The receiving
stream segment of the Ararat River is meeting the criteria for Temperature (29°C for aquatic life in upper
piedmont and mountain waters) according to the Final 2018 Integrated Report. Reviewed instream
temperature data showed seasonal patterns of summer highs and winter lows at both locations. Downstream
temperature was slightly lower (average = 18.5 °C; range: 6.126.1 °C) than that upstream (average = 18.9
°C; range: 6.1-27.6 °C), but tested lower on average (t-test, p < 0.0005). Temperature maxima were below
the water quality standard of 29°C for upper piedmont and mountain waters (15A NCAC 02B .0211) at
both locations. The highest upstream to downstream temperature increase was 1.5 °C, below the 2.8 °C
increase standard. The concurrent effluent temperatures averaged higher overall at 19.2 °C with higher
winter minima (range: 7.7-26.3 °C). It appears that the effluent is not affecting the instream temperature.
Conductivity — Conductivity (Specific Conductance) is a parameter of concern due to industrial discharges;
however, the facility does not receive any industrial discharges nor does it have a pretreatment program.
Instream conductivity monitoring is in the permit, and data are available from coalition monitoring efforts.
Instream data showed the downstream average of 90 µS/cm (range: 50119 µS/cm) to be significantly
lower than the upstream average of 112 µS/cm (range: 50-165 µS/cm). Conductivity levels in both sites
dropped substantially in August -September 2018 from an average of 121 µS/cm (range: 70-165 µS/cm) to
61 µS/cm (range: 50-88 µS/cm).
Effluent monitoring for Conductivity is not in the permit; instream results appear to indicate no effluent
impacts. Per the Division's 2002 Instream Conductivity and Fecal Coliform Monitoring Guidance,
Conductivity monitoring is not required if the facility is discharging 100% domestic wastewater. Pilot
Mountain WWTP treats 100% domestic wastewater; instream conductivity monitoring is not required and
has been removed from the permit.
Fecal Coliform — Fecal Coliform is a parameter of concern for aquatic life and human health. The
downstream coliform count geometric mean was 108 cfu/100 mL (range: 46-9200 cfu/100 mL), while the
upstream was 180 cfu/100 mL (range: 56-9800 cfu/100 mL). Concurrent effluent coliform counts were
substantially lower with a geometric mean of 3 cfu/100 mL (range: < 12420 cfu/100 mL).
Per the Division's 2002 Instream Conductivity and Fecal Coliform Monitoring Guidance, Fecal Coliform
monitoring is not required unless the receiving stream is either a Class B waterbody or is impaired due to
coliform. The receiving water is neither, so instream monitoring for coliform is not required and has been
removed from the permit.
Is this facility a member of a Monitoring Coalition with waived instream monitoring (YIN): YES.
Name of Monitoring Coalition: Yadkin Pee Dee River Basin Association (YPDRBA).
5. Compliance Summary
Summarize the compliance record with permit effluent limits (past 5 years): The facility has reported five
Fecal Coliform weekly limit exceedences and one TSS weekly limit exceedence over the past five years
(May 2015 — April 2020). The coliform exceedences occurred in Sep. 2015, Oct. 2015, Jun. 2016, Mar.
2018, and Sep. 2018; the TSS exceedence occurred in Feb. 2016. Each exceedence resulted in a Notice of
Violation.
Page 5 of 14

Summarize the compliance record with aquatic toxicity test limits and any second species test results (past
5 years): The facility passed 17of 17 quarterly chronic toxicity tests from Jan. 2016 — Jan. 2020, as well as
all 4 second species chronic toxicity tests, collected on May 4, Jun. 1, Jul. 6 and Aug. 10, 2020.
Summarize the results from the most recent compliance inspection: The most recent inspection (compliance
evaluation), conducted 01/08/2019, found the facility to be in compliance.
6. Water Quality -Based Effluent Limitations (WQBELs)
Dilution and Mixin Zones
ones
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/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: The current BOD
limits are the same as TBELs at both flow tiers.
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/L (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 µg/L) and capped at 28 µg/L (acute impacts). Due to analytical issues, all TRC values
reported below 50 µg/L are considered compliant with their permit limit.
Describe any proposed changes to ammonia and/or TRC limits for this permit renewal: Ammonia (NH3-
N) and TRC have been reviewed in the attached Wasteload Allocation (WLA) sheets for each flow tier,
using the summer/winter 7Q10 flows of 82.2/163 cfs. Resulting allowable concentrations of 28.6 mg/L
monthly average with a weekly average capped at 35 mg/L for NH3-N in summer, and results are over 35.0
mg/L for both summer and winter at 1.5 MGD, thereby requiring monitoring only. The 1.5 MGD results
are the same as the current limit/monitoring requirements in the permit at both flow tiers. The ammonia
requirements at 1.5 MGD were frozen for 0.5 MGD to prevent backsliding when the lower tier was placed
in the permit in 2006. TRC results are also capped at 28 µg/L, the same as the current permit limit at both
flow tiers. Therefore, the existing NH3-N and TRC limits are maintained in the permit.
Reasonable Potential Analysis (RPA) for Toxicants
If applicable, conduct RPA analysis and complete information below.
Page 6 of 14

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 '/2 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 April 2016 and
January 2020. 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: Copper at 1.5 MGD flow tier.
• 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: Copper at 0.5
MGD flow tier will be monitored monthly based on several relatively high results.
• 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: Zinc at both
flow tiers.
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: NA.
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.
Toxici . Testing Limitations
Permit limits and monitoring requirements for Whole Effluent Toxicity (WET) have been established in
accordance with Division guidance (per WET Memo, 8/2/1999). Per WET guidance, all NPDES permits
issued to Major facilities or any facility discharging "complex" wastewater (contains anything other than
domestic waste) will contain appropriate WET limits and monitoring requirements, with several exceptions.
The State has received prior EPA approval to use an Alternative WET Test Procedure in NPDES permits,
using single concentration screening tests, with multiple dilution follow-up upon a test failure.
Describe proposed toxicity test requirement: Pilot Mountain WWTP is a Minor POTW discharging
domestic wastewater with chronic WET limits of 1% effluent at 0.5 MGD and 3% at 1.5 MGD, monitored
quarterly. These requirements are maintained in the permit.
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
Page 7 of 14

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/L) 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/L) and/or if any individual value exceeds a TBEL value of 47 ng/L.
Describe proposed permit actions based on mercury evaluation: The current permit has a mercury special
condition to analyze one effluent sample using EPA Method 1613E. The permit application included two
lab reports from a split sample collected on May 22, 2018: both labs reported 5.06 ng/L Mercury via EPA
Method 1613E. The resuls are not greater than either the TBEL of 47 ng/L or the WQBEL of 1285 ng/L at
0.5 MGD or 436 ng/L at 1.5 MGD. In accordance with Total Mercury TMDL Implementation permitting
guidance document (DWQ 2015), monitoring is required once every five years. No changes were made.
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 15A
NCAC 2IL 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.
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
BOD5 /TSS for Monthly Average, and 45 mg/L for BOD51TSS for Weekly Average). BOD and TSS limits
are set at the TBEL levels of 30/45 mg/L monthly/weekly average.
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.
Page 8 of 14

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.
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.
All effluent monitoring frequencies follow 15A NCAC 2B .0508 for Grade II Wastewater Treatment
Facilities with the exception of Oil & Grease monitoring, which is not listed in 2B .0508. All reviewed
effluent Oil & Grease data were non -detects at < 0.5 mg/L. Based on the results, monitoring for Oil &
Grease is not required and has been removed from the permit.
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
Permit conditions, limitations and proposed changes at 0.5 MGD and 1.5 MGD flow tiers are in Tables 2
and 3, respectively.
Table 2. Current Permit Conditions and Proposed Changes at 0.5 MGD.
Parameter
Current Permit
Proposed Change
Basis for Condition/Change
Flow
MA = 0.5 MGD
No change
15A NCAC 2B .0505
Page 9 of 14

Biological Oxygen
MA = 30.0 mg/L
TBEL. Secondary treatment
Demand, 5-day
WA = 45.0 mg/L
No change
standards/40 CFR 133/15A NCAC
(BOD5)
2B .0406.
Total Suspended
MA = 30.0 mg/L
TBEL. Secondary treatment
Solids (TSS)
WA = 45.0 mg/L
No change
standards/40 CFR 133/15A NCAC
2B .0406.
Summer
MA 28.6 mg/L
WQBEL. Requirements frozen from
Ammonia-N (NH3-N)
WA = 35.0 mg/L
No change
MGD levels to prevent
Winter
baa cksliding when lower tier placed
Monitor weekly
in permit.
Dissolved Oxygen
WQBEL. Based on protection of the
(DO)
DA > 5 mg/L
No change
DO standard, 15A NCAC 2B .0200
and .0500.
WQBEL. State WQ standard, 15A
Fecal Coliform
MA = 200 /100 mL
Monitor 2/week on
NCAC 2B .0200. Monitoring
(geometric mean)
WA = 400 /100 mL
consecutive days.
frequency increased based on
Monitor weekly
multiple weekly exceedences and
high individual sample values.
Temperature
Monitor daily
No change
15A NCAC 2B .0500 — Surface
Water Monitoring: Reporting
Monitor up- and
Facility treats 100% domestic
Conductivity
downstream weekly
Remove from permit
wastewater. Division guidance
memo, Apr. 22, 2012.
Receiving water neither Class B nor
Fecal Coliform
Monitor up- and
Remove from permit
impaired due to Fecal Coliform.
downstream weekly
Division guidance memo, Apr. 22,
2012.
Not listed in state WQ monitoring
Oil & Grease
Monitor monthly
Remove from permit
requirements for domestic
wastewater discharges, 15A NCAC
2B .0508.
Total Nitrogen (TN)
Monitor monthly
No change
15A NCAC 2B .0500 — Surface
Water Monitoring: Reporting
Total Phosphorus
Monitor monthly
No change
15A NCAC 2B .0500 — Surface
(TP)
Water Monitoring: Reporting
pH
6.0— 9.0 SU
No change
WQBEL. State WQ standard, 15A
NCAC 2B .0200.
Parameter
Current Permit
Proposed Change
Basis for Condition/Change
No reasonable potential to exceed
Total Copper
Monitor quarterly
Monitor monthly
WQ standards, but max. predicted
value > 50% of allowable
Page 10 of 14

concentration. Submitted data
yielded several relatively high
values.
No reasonable potential to exceed
Total Zinc
Monitor quarterly
Remove from permit
WQ standards, and max. predicted
value < 50 /o of allowable
concentration.
Total Residual
DM 28 µg/L
No change
WQBEL. State WQ acute standard,
Chlorine (TRC)
15A NCAC 213.0200.
Hardness -dependent dissolved
Add effluent and
metals water quality standards,
Total Hardness
No requirement
upstream monitoring
approved in 2016, need effluent and
instream hardness data for
calculations of permit limitations.
In accordance with 2012 Statewide
Total Mercury
Monitor once per
No change
Mercury TMDL Implementation, per
five years
facility size and monitoring data
criteria.
Chronic
Ceriodaphni dubia
WQBEL. No toxics in toxic
Toxicity Test
o
Pass/Fail at 1 /0
No change
amounts. 15A NCAC 02B .0200,
effluent
15A NCAC 02B .0500.
Electronic Reporting
Electronic Reporting
Update language
In accordance with EPA Electronic
Special Condition
Reporting Rule 2015.
MGD = Million gallons per day, MA = Monthly Average, WA = Weekly Average, DM = Daily Maximum.
Table 3. Current Permit Conditions and Proposed Changes at 1.5 MGD.
Parameter
Current Permit
Proposed Change
Basis for Condition/Change
Flow
MA = 1.5 MGD
No change
15A NCAC 213.0505
Biological Oxygen
MA = 30.0 mg/L
TBEL. Secondary treatment
Demand, 5-day
WA = 45.0 mg/L
No change
standards/40 CFR 133/15A NCAC
(BOD5)
213 .0406.
Total Suspended
= 30.0 mg/L
TBEL. Secondary treatment
Solids (TSS)
IMA
= 45.0 mg/L
No change
standards/40 CFR 133/15A NCAC
213 .0406.
Parameter
Current Permit
Proposed Change
Basis for Condition/Change
Summer
WQBEL. Calculation results based
Ammonia-N (NH3-N)
MA = 28.6 mg/L
No change
on NC's use of EPA criteria in
WA = 35.0 mg/L
developing criteria 1.0 mg/L
Winter
summer and 1.8 mg/L winter values
Page 11 of 14

Monitor weekly
in wasteload allocations to protect
against NH3-N toxicity (see WLA
sheet attached)
Dissolved Oxygen
WQBEL. Based on protection of the
(DO)
DA > 5 mg/L
No change
DO standard, 15A NCAC 2B .0200
and .0500.
Fecal Coliform
MA = 200 /100 mL
No change
WQBEL. State WQ standard, 15A
(geometric mean)
WA = 400 /100 mL
NCAC 213.0200.
Temperature
Monitor daily
No change
15A NCAC 2B .0500 — Surface
Water Monitoring: Reporting
Monitor up- and
Facility treats 100% domestic
Conductivity
downstream weekly
Remove from permit
wastewater. Guidance memo, April
22, 2012.
Monitor up- and
Receiving water neither Class B nor
Fecal Coliform
downstream weekly
Remove from permit
impaired due to Fecal Coliform.
Guidance memo, April 22, 2012.
All submitted effluent data
nondetects. Not listed in state WQ
Oil & Grease
Monitor monthly
Remove from permit
monitoring requirements for
domestic wastewater discharges,
15A NCAC 213.0508.
Total Nitrogen (TN)
Monitor weekly
No change
15A NCAC 213 .0500 — Surface
Water Monitoring: Reporting
Total Phosphorus
Monitor weekly
No change
15A NCAC 2B .0500 — Surface
(TP)
Water Monitoring: Reporting
pH
6.0— 9.0 SU
No change
WQBEL. State WQ standard, 15A
NCAC 213.0200.
Hardness -dependent dissolved
Add effluent and
metals water quality standards,
Total Hardness
No requirement
upstream monitoring
approved in 2016, need effluent and
instream hardness data for
calculations of permit limitations.
MA = 286 µg/L
WQBEL. Reasonable potential to
Total Copper
Monitor quarterly
WA = 313 µg/L
exceed instream WQ standard. 15A
NCAC 213.0200.
No reasonable potential to exceed
Total Zinc
Monitor quarterly
Remove from permit
WQ standards, and max. predicted
value < 50 /o of allowable
concentration.
Total Residual
DM = 28 µg/L
No change
WQBEL. State WQ acute standard,
Chlorine (TRC)
15A NCAC 213.0200.
Parameter
Current Permit
Proposed Change
Basis for Condition/Change
In accordance with 2012 Statewide
Total Mercury
Monitor once per
No change
Mercury TMDL Implementation, per
five years
facility size and monitoring data
criteria.
Page 12 of 14

Chronic
Ceriodaphni dubia
WQBEL. No toxics in toxic
Toxicity Test
o
Pass/Fail at 3 /0
No change
amounts. 15A NCAC 02B .0200,
effluent
15A NCAC 02B .0500.
Effluent Pollutant
Three times per
No change
40 CFR 122. Permittee shall monitor
Scan
permit cycle
in 2021, 2022, and 2023.
Electronic Reporting
Electronic Reporting
Update language
In accordance with EPA Electronic
Special Condition
Reporting Rule 2015.
MGD = Million gallons per day, MA = Monthly Average, WA = Weekly Average, DM = Daily Maximum;
DA = Daily Average.
13. Public Notice Schedule:
Permit to Public Notice: 09/11/2020.
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 questions regarding any of the above information or on the attached permit, please contact Gary
Perlmutter at [phone] or via email at gary_perlmutter(acr�,ncdenr.gov.
15. Fact Sheet Addendum (if applicable):
Were there any changes made since the Draft Permit was public noticed (Yes/No): NO; no comments were
received by the Permittee, EPA, DEQ Regional Office or any other party.
If Yes, list changes and their basis below: NA.
16. Fact Sheet Attachments (if applicable):
• Four 2°d species toxicity test lab reports
• Pretreatment Information Request Form, completed
• Effluent data trend charts and data summaries
• DMR Comments
• BOD and TSS removal summaries
• Instream monitoring trend charts and data summaries
• Monitoring Report (MR) Violations sheet for Violation Category: Limit Violation
• WET Testing and Self Monitoring sheet, page 87
• Compliance Evaluation Report, 06/19/2019
• NH3/TRC WLA Calculations sheets (one for each flow tier)
• Hardness test results (lab reports)
Page 13 of 14

• RPA Spreadsheet Summaries (for each flow tier)
• Dissolved Metals Fact Sheet memo
Page 14 of 14

Effluent Toxicity Report Form -Chronic Fathead Minnow Multi -Concentration Test Date:5/15/2020
001
Laboratory: Research & Analytical Laboratories
x
IgnAw
e o In esponsi a Charge
x
Test Initiation Date/Time
5/6/2020
% Eff. Repl.
1
Po-n-tr-o-11 Surviving #
Original #
Wt/original (mg)
0.25 Surviving #
Original #
Wt/original (mg)
0.50 Surviving #
Original #
Wt/original (mg)
1.00 Surviving #
Original #
Wt/original (mg)
1.50 Surviving #
Original #
Wt/odginal (mg)
2.00 Surviving #
Original #
Wt/original (mg)
Quality Data
Control
0
pH (SU) IniUFin
DO (mg/L) InitIFln
Temp (C) Init/Fin
High Concentration
0
pH (SU) Init/Fin
DO(mg/L)IntlFin
Temp (C) Init/Fin
Sample
1
Collection Start Date
Grab
Composite (Duration)
Hardness (mg/L)
Alkalinity (mg/L)
Conductivity (umhos/cm)
Chlodne(mg/L)
Temp. at Receipt (°C)
Division of Water (duality
NC DENR
1621 Mail Service Center
Raleigh, NC 27699-1621
/ 1:37PM Avg Wt/Surv. Control
2 3 4
15
15
15
15
15
15
15
15
0.7740
0.7480
0.7307
0.7413
15
15
15
15
15
15
15
15
0.7480
0.7280
0.7367
0.7373
15
15
15
15
15
15
15
15
0.7387
0.7387
0.7453
0.7593
15
15
15
15
15
15
15
15
0.6967
0.7367
0.7400
0.6933
15
15
15
15
15
15
15
15
0.7160
0.7227
0.7287
0.6840
15
15
15
15
15
15
15
15
0.6860
0.7387
0.6580
0.6580
Day
% Survival 100.0
Avg Wt (mg) 0.7485
% Survival 100.0
Avg Wt (mg) 0.7375
% Survival 100.6
Avg Wt (mg) 0.7455
% Survival 100.0
Avg Wt (mg) 0.7167
% Survival 100.0
Avg Wt (mg) 0.7129
% Survival 100.0
Avg Wt (mg) 0.6852
1 2 3 4 5 6
7.09
/ 6.99
7.11 /
7.01
7.12 /
6.99
7.10 /
7.01
7.12 /
7.07
7.08 /
7.04
7.07
/ 7.01
8.B
/ 8.3
8.6 /
8.2
8.6 /
8.4
8.5 /
8.3
8.6 /
8.2
8.5 /
8.3
8.6
/ 8.2
24.6
/ 24.6
24.6 /
24.4
24.5 /
24.5
24.6 /
24.5
24.5 /
24.6
24.6 /
24.5
24.5
/ 24.5
1 2 3 4 5 6
7.04 / fi.97
7.07 /
7.01
7.12 /
7.00
7.11
/ 6.99
7.14 /
8.95
7.09 /
6.99
7.13 /
7.03
8.6 / 8.4
8.6 /
8.3
8.5 /
8.1
8.6
/ 8.2
8.5 /
8.2
8.6 /
8.2
8.5 /
8.1
24.5 1 24.6
24.5 /
24.5
24.4 /
24.4
24.6
/ 24.5
24.5 /
24.6
24.6 /
24.5
24.6 /
24.4
2 3
5/4/2020
517/2020
5/10/2025
24
24
24
31
35
41
32
40
39
236
344
270
0.04
0.02
0.03
3.9
3.2
3.2
Dilution H2O
Hardness (mg/L) 98
Alkalinity (mg/L) 62
Conductivity (umhos/cm) 402
Test Organisms
1" Cultured in -House
Outside Supptier
Hatch Date: 5/4/2020
Hatch Time: >1600
Survival
Growth
Overall Result
Normal
N
pr 1;
ChV >2.0%
Hom. Var.
r1l
P
NOEC
2.00
2.00
LOEC
>2.0%
>2.0%
ChV
>2.0%
>2.0%
Method
Steels
Dunnetts
Stats
Survival
Growth
Conc.
Critical
Calculated
Critical
Calculated
0.25
10
14.5
2.41
0.6985
0.50
10
17
2.41
0.1905
1.00
10
12
2.41
2.0210
1.50
10
10
2.41
2.2639
2.00
10
11
2.41
4.0214
DWQ Form A T 5 (1104)

Effluent Toxicity Report Form -Chronic Fathead Minnow Multi -Concentration Test
-i ity: Town of Pilot Mtn WWTP NPIDES # NCOO 26646 Pipe : 001County:
Labocatory: Research & Analytical Laboratories lCornmentS Final Efflue
x
9-ignatureof Oper,,Tfilesponsible Charge
x r�
Test Initiation Date/Time
6/3/2020
% Eff. Repl.
1
Control Surviving #
Original #
Wt/original (mg)
0.25 Surviving #
Original #
Wt/original (mg)
0.50 Surviving #
Original #
Wt/original (mg)
1.00 Surviving #
Original #
Wt/original (mg)
Division of Water (Quality
NC: DENR
1621 N1ai15ervice Center
Raleigh, NC 27699-1621
/ 1.21 PM Avg Wt/Surv. Control
2 3 d
15
15
15
15
15
15
15
15
0.7787
0.7787
0.8007
0.8193
15
15
15
15
15
15
15
15
0.8133
0.7753
0.7973
0.7913
5
15
15
15
5
EO.7760
15
15
15
0.7813
0.I
0.7893
15
15
15
15
15
15
15
15
0.7860
0.7873
0.7993
0.7827
1.50 Surviving #
Original #
Wt/original (mg)
2.00 Surviving #
Original #
Wt/original (mg)
Water Quality Data
Control
0
pH (SU) Init/Fin
DO (mg/L) Init/Fin
Temp (C) [nit/Fin
15
15
15
15
15
15
15
15
0.7793
0.7647
0.7847
0.7867
15
15
15
15
15
15
15
15
0.7780
0.7747
0.7807
0.7793
Day
% Survival 100.0
Avg Wt (mg)0.7K1
% Survival 100.0
Avg Wt (mg) 0.7943
% Survival 100.0
Avg Wt (mg) 0.7867
% Survival 106-01
Avg Wt (mg) 0.7888
% Survival 100.0
Avg Wt (mg) 0.7789
% Survival 100.0
Avg Wt (mg) 0.7782
1 2 3 4 5 6
7.08 1
6.99
7.04 /
7.00
7.14 /
7.03
7.15 /
7.11
7.20 /
7.01
7.14 /
6.99
7.11 /
7.03
8.6 /
8.3
8.6 1
8.2
8.5 1
8.2
8.6 /
8.3
8.6 /
8.4
8.6 /
8.3
8.5 /
8.2
24.7 /
24.7
24.6 /
24.5
24.6 /
24.6
24.6 /
24.5
24.5 /
24.5
24.4 /
24.5
24.5 /
24.5
High Concentration 0
pH (SU) Init/Fin
DO(mg/L)InUFin
Temp (C) Init/Fin
1 2 3 4 5 6
7.06 !
7.02
6.98 /
7.00
7.01 /
6.98
7.03 /
6.99
7.00 /
6.95
7.04 /
6.99
7.08 /
7.01
8.6 1
8.3
8.6 /
8.4
8.5 /
8.2
8.4 /
8.0
8.5 /
8.2
8.5 /
8.1
8.6 /
8.2
24.5 /
24.7
24.6 /
24.5
24.5 /
24.6
24.6 /
24.6
24.5 /
24.5
24.4 /
24.5
24.5 /
24.6
Date:6/12/2020
Test Organisms
rw Cultured In -House
f Outside Supplier
Hatch Date: 6/1 /2020
Hatch Time: >1600
Sample
1
2
3
Survival
Growth
Overall Result
Collection Start Date
6/1/2020
6/4/2020
6/7/2020
Normal
ri
rl `
ChV >2.0%
Grab
Hom. Var.
n,
F1.
Composite (Duration)
24
24
24
NOEC
2.00
2.00
Hardness (mg/L)
44
41
43
LOEC
>2.0%
>2.0%
Alkalinity (mg1L)
36
33
29
ChV
>2.0%
>2.0%
Conductivity (umhos/cm)
253
262
284
Method
Steels
Dunnetts
Chlorine(mg/L)
0.02
0.02
0.03
Temp. at Receipt (°C)
3.4
3.0
3.6
Stats
Survival
Growth
Conc.
Critical
Calculated
Critical
Calculated
Dilution H2O
0.25
10
17
2.41
0.0058
Hardness (mg/ L)
98
0.50
10
16
2.41
0.8902
Alkalinity (mg/L)
62
1.00
10
18
2.41
0.6387
Conductivity (umhos/cm)
401
1.50
10
16
2.41
1.7919
2.00
10
14
2.41
1.8700
DWQ Form AT-5 (1104)

Effluent Toxicity Report Form -Chronic Fathead Minnow Multi -Concentration Test Date:7i17i2020
Laboratory: Research & Analytical Laboratories
x
Igna ur pe t esponsia Charge
x
7jgna 511orampy Supervisor
am ATIP'PT57MUT"
Test Initiation Date/Time
7/8/2020
% Eff. Repl.
1
Control Surviving #
Original #
Wt/original (mg)
0.25 Surviving #
Original #
Wtlodginal (mg)
0.50 Surviving #
Original #
Wt/odginal (mg)
1.00 Surviving #
Original #
Wt/original (mg)
1.50 Surviving #
Original #
Wt/original (mg)
2.00 Surviving #
Original #
Wt/original (mg)
Quality Data
Control
0
pH (SU) Init/Fin
DO (mg/L) IniVFin
Temp (C) init/Fin
High Concentration
0
pH (SU) Init/Fin
DO(mg/L)Int/Fin
Temp (C) IniUFin
Sample
1
Collection Start Date
Grab
Composite (Duration)
Hardness (mg/L)
Alkalinity (mg/L)
Conductivity (umhos/cm)
Chlorine(mg/L)
Temp. at Receipt (°C)
Division of Water (duality
NC DENR
1621 Mail Service Center
Raleigh, NC 27699-1621
Avg Wt/Surv. Control 0.7569 Test Organisms
4_ Cultured In -House
15 15 15 15
15 15 15 15
--d
0.7647 0.7467 0.7533 0.7627
/ 1.58PM
2 3
15 15 15 15
15 15 15 15
0.7760 0.7727 0.7673 0.7620
15
15
15
15
15
15
15
15
0.7653
0.7567
0.7613
0.7680
15
15
15
15
15
15
15
15
0.7540
0.7693
0.7600
0.7640
15
15
15
15
15
15
15
15
0.7593
0.7607
0.7507
0.7560
15
15
15
15
15
15
15
15
0.7613
0.7667
0.7647
0.7527
Day
% Survival 100.0 f Outside Supplier
Avg Wt (mg) 0.7569 Hatch Date: 7/6/2020
% Survival 100.0 Hatch Time: >1600
Avg Wt (mg) 0.7U5
% Survival 100.0
Avg Wt (mg) 0.7628
% Survival 100.0
Avg Wt (mg) 0.7618
% Survival 100.0
Avg Wt (mg) 0.7W7
% Survival 100.0
Avg Wt (mg) 0.76174
1 2 3 4 5 6
7.16
/ 7.04
7.19 /
7.03
7.22 /
7.10
7.21
/ 7.07
7.22 /
7.10
7.17 /
7.11
7.19 /
7.09
8.5
/ 8.2
8.6 /
8.3
8.6 /
8.2
8.5
/ 8.3
8.5 /
8.2
8.6 /
8.1
8.6 /
8.2
24.6
I 24.5
24.6 /
24.6
24.6 /
24.5
24.6
/ 24.5
24.5 /
24.5
24.6 /
24.4
24.5 /
24.7
1 2 3 4 5 6
fi.90 /
6.84
6.92 /
6.80
6.84 /
6.77
6.80 /
6.75
6.82 /
6.79
6.94 /
6.87
6.99 /
6.89
8.5 1
8.4
8.6 /
8.4
8.5 /
8.2
8.5 /
8.1
'8.6 /
8.3
8.6 !
8.3
8.5 /
8.2
24.5 /
24.7
24.6 /
24.5
24.6 /
24.5
24.5 /
24.5
24.6 /
24.4
24.5 1
24.5
24.4 /
24.6
2 3
7/6/2020
7/9/2020
7/12/2020
24
24
24
42
45
41
33
34
30
310
300
320
0.01
0.01
0.03
2.7
1 2.8
1 2.8
Dilution H2O
Hardness (mg/L) 98
Alkalinity (mg/L) 63
Conductivity (umhos/cm) 402
Survival
Growth
Overall Result
Normal
rh
ry .11l
ChV >2.0%
Hom. Var.
ri
FFI;
NOEC
2.00
2.00
LOEC
>2.0%
>2.0%
ChV
>2.0%
>2.0%
Method
Steels
Dunnetts
Slats
Survival
Growth
Conc.
Critical
Calculated
Critical
Calculated
0.25
10
24
2.41
-2.8752
0.50
10
22
2.41
-1.3580
1.00
10
21
2.41
-1.1307
1.50
10
17
2.41
0.0398
2.00
10
20.5
2.41
-1.0228
O WQ Form A T-5 (1104)

Effluent Toxicity Report Form -Chronic Fathead Minnow Multi -Concentration Test Date:8i20i2020
Facility: Town of Pilot Mtn WWTP NPIDES # NCOO 26646 Pipe #: 001County: Surry
Laboratory: Research & Analytical Laboratories Comments Final Effluent
x
ignature p m ponsible Charge
x 5A
igna e o or o upervisor - - , 86235-01
MAIL URIGINALTU: Environmental eiences Branch
Test Initiation Date/Time
8/12/2020
% Eff. Repl.
1
Control Surviving #
Original #
Wt/original (mg)
0.25 Surviving #
Original #
Wtloriginal (mg)
0.50 Surviving #
Original #
Wt/original (mg)
1.00 Surviving #
Original #
Wt/original (mg)
1.50 Surviving #
Original #
Wt/original (mg)
2.00 Surviving #
Original #
Wt/original (mg)
Quality Data
Control
0
pH (SU) Init/Fin
DO (mg/L) Init/Fin
Temp (C) [nit/Fin
High Concentration
0
pH (SU) Init/Fin
DO(mg/L)IntlFin
Temp (C) [nit/Fin
Sample
1
Collection Start Date
Grab
Composite (Duration)
Hardness (mg/L)
Alkalinity (mg/L)
Conductivity (umhos/cm)
Chlorine(mg/L)
Temp. at Receipt (°C)
Division of Water (Quality
NC: DENR
1621 Mail Service Center
Raleigh, NC 27699-1621
/ 1:12PM Avg Wt/Surv. Control 0.7902
2 3 4
15
15
15
15
15
15
15
15
0.7867
0.7947
0.7893
0.7900
15
15
15
15
15
15
15
15
0.7873
0.7853
0.7887
0.7927
15
15
15
15
15
15
15
15
0.7933
0.7893
0.7860
0.7873
15
15
15
15
15
15
15
15
0.7907
0.7860
0.7913
0.7960
15
15
15
15
15
15
15
15
0.7933
0.7940
0.7867
0.7893
15
15
15
15
15
15
15
15
0.7920
0.7907
0.7900
0.7860
Day
% Survival 100.0.7902 Avg Wt (mg) 0
% Survival 100.0
Avg Wt (mg) 0.7885
% Survival 100.0
Avg Wt (mg) 0.7890
% Survival 100.0
Avg Wt (mg) 0.7910
% Survival 100.0
Avg Wt (mg) 0.7908
% Survival 100.0
Avg Wt (mg) 0.7897
1 -- 2 3 4 5 6
7.01 / 6.99
7.07 / 7.00
7.06 / 6.98
7.06 1 7.00
7.06 / 6.97
7.04 1 7.00
7.05 / 6.99
8.6 1 8.3
8.5 / 8.2
8.6 / 8.2
8.5 / 8.1
8.5 / 8.2
8.5 / 8.2
8.6 / 8.1
24.7 / 24.6
24.6 / 24.5
24.4 / 24.6
24.6 / 24.5
24.4 / 24.5
24.6 / 24.5
24.4 / 24.6
1 2 3 4 5 6
7.03
/ 7.03
7.10 /
7.02
7.07 1
7.0 3
7. 88 1
7.00
7.05 /
7.01
7.07 /
7.04
7.06 /
6.98
8.6
! 8.2
8.6 /
8.3
8.6 1
8.3
8.5 /
8.2
8.5 /
8.1
8.6 1
8.2
8.6 1
8.2
24.6
/ 24.5
24.6 /
24.5
24.6 /
24.6
24.5 !
24.5
24.5 /
24.6
24.5 /
24.5
24.6 /
24.5
2 3
8/10/2020
8/13/2020
8/16/2020
24
24
24
42
40
38
29
27
24
265
341
251
0.02
0.03
0.03
2.6
1 2.6
1 3.2
Dilution H2O
Hardness (mg/L) 98
Alkalinity (mg/L) 64
Conductivity (umhos/cm) 399
Test Organisms
I' Cultured In -House
f Outside Supplier
Hatch Date: 8/10/2020
Hatch Time: >1600
Survival
Growth
Overall Result
Normal
P1
FF.. I
ChV >2.0%
Hom. Var.
rV
F1'I
NOEC
2.00
2.00
LOEC
>2.0%
>2.0%
ChV
>2.0%
>2.0%
Method
Steels
Dunnetts
Slats
Survival
Growth
Conc.
Critical
Calculated
Critical
Calculated
0.25
10
15
2.41
0.7125
0.50
10
15.5
2.41
0.5104
1.00
10
20
2.41
-0.3509
1.50
10
18
2.41
-0.2765
2.00
10
18.5
2.41
0.2127
DWQ Form AT-5 (1104)

NPDES/Aquifer Protection Permitting Unit Pretreatment Information Request Form
PERMIT WRITER COMPLETES THIS PART:
Check all that
PERMIT WRITERS -AFTER you get this form back
apply
from PERCS:
- Notify 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
4/22/2020
municipal renewal
x
Requestor
Gary Perlmutter
new industries
Facility Name
Pilot Mtn WWTP
WWTP expansion
Permit Number
NCO026646
Speculative limits
Region
Winston-Salem
stream reclass.
Basin
Yadkin
outfall relocation
7Q10 change
other
other
check applicable PERCS staff:
Other Comments to PERCS:
Facility is rated 1.5 MGD, but operates at 0.5 MGD. The permit application
notes that it has a pretreatment program, but no SIUs are listed.
BIRD, CPF, CTB, FRB, TAR
Vivien Zhon 807-6310
CHO, HIW, LTN, LUM, NES, NEW, ROA, YAD
X
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
X 2) facility has no SIU's, does not have Division approved Pretreatment Program
3) facility has SIUs and DWQ approved Pretreatment Program (list "DEV" if program still under development)
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
Most recent:
Uncontrollable
n/a
Next Cycle:
a
v~
O
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
BOD
4
Q M
TSS
4
Q M
NH3
4
Q M
Arsenic
4
Q M
Cadmium
4
Q M
Chromium
4
Q M
1
Copper
4
Q M
Cyanide
4
Q M
Is all data on DMRs?
Lead
4
Q M
YES
Mercury
4
Q M
NO (attach data)
Molybdenum
4
Q M
Nickel
4
Q M
Silver
4
Q M
Selenium
4
Q M
Zinc
4
Q M
Is data inspreadsheet?
Total Nitrogen
4
Q M
YES (email to writer)
Phosphorus
4
Q M
NO
4 Q M
4 Q M
4 Q M
4 Q M
*Always in the LTMP/STMP ** Only in LTMP/STMP if sludge land app or composte (dif POCs for incinerators)
*** Only in LTMP/STMP while SIU still discharges to POTW **** Only in LTMP/STMP when pollutant is still of concern to POTW
Comments to Permit Writer (ex., explanation of any POCs: info you have on IU related investigations into NPDES problems):
Pilot Mountain WWTP does not have Division approved Pretreatment Program, per PERCS database.
26646 Pretreatment.request.form
Revised: July 24, 2007

Pilot Mountain WWTP Effluent Monitoring NC0026646
Flow
• Mo Avg Limit
0.6
0.5
0.4
0
0.3
•
0.2 •••• •� 0% M%406" •
0.1 i •�••� • M
0
oti' oti° oti° 00 oti oti oti otio oti° oti° oti°
50
40
30
E 20
10
0
tih
50
40
30
a
E 20
10
0
tih
Biological Oxygen Demand (BOD)
Wk Avg ♦ Mo Avg WA Limit MA Limit
oti° oti
y\�ti�ti ��ti�\�
APSAIIIIIII
O�A O, O00
Total Suspended Solids (TSS)
Wk Avg ♦ Mo Avg WA Limit
r -ice_ I •
MA Limit
•
oti° oti° otiI oti °tiw oti' oti° oti° oti°
Summary
Statistics
n
1427
Avg
0.164
SD
0.074
Min
0.057
Max
0.699
Summary
Statistics
n
209
Avg
4.64
SD
4.28
Min
2.00
Max
35.50
Summary
Statistics
n
210
Avg
7.5
SD
4.8
Min
2.5
Max
36.7
Page 1 of 5 GB Perlmutter, 4/30/2020

Pilot Mountain WWTP Effluent Monitoring NC0026646
Ammonia (NH3)
Wk Avg ♦ Mo Avg WA Limit
40
35 —
30
J 25
ova 20
E 15
10
MA Limit
oti'
oti°
oti°
oti
oti
oti00 oti00
oti°
oti°
oti°
Disolved Oxygen (DO)
♦ Effluent Limit
12.0
10.0 AA
Ak
Ar
6.0
Sao .0
E
4.0
2.0
0.0
0, o
otiI oti oti' oti' oti° oti° oti°
3o���y6"V
Fecal Coliform
Wk Avg ♦ Mo Avg WA Limit — — — MA Limit
10000
••e• a• • 4NI •411 • V
loon
J
E-- -- -- -- -- -- r—
c 100 • • '
10
1 ♦♦ ♦ ♦ u,
ootio o6ti1 oti
oti00 oti00 oti° oti° oti°
Summary
Statistics
Summer
n
123
Avg
2.1
SD
2.2
Min
0.1
Max
17.5
Winter
n
86
Avg
3.0
SD
2.5
Min
0.1
Max
11.4
Summary
Statistics
n
210
Avg
7.45
SD
1.48
Min
5.27
Max
11.06
Summary
Statistics
n
221
Geomean
2.14
Min
1.00
Max
2450.00
Page 2 of 5 GB Perlmutter, 4/30/2020

Pilot Mountain WWTP Effluent Monitoring NCO026646
Temperature
30.0
25.0
20.0
a 15.0
10.0
5.0
0.0
oti' oti° oti° oti oti oti' oti' oti° oti° oti°
Total Nitrogen
25.0
20.0
15.0 ♦♦
AA
5.0
0.0
oti° oti° oti oti oti' Cb oti oti° oti° oti°
o\I��ti
Total Phosphorus
6.0
5.0
4.0 ♦♦
t�uo 3.0
E AA ♦ ♦ ♦ ♦ ♦ ♦ y
2.0 ♦ ♦ ♦ ♦♦
♦ ♦ ♦ ♦♦
1.0 ♦ y ♦♦ ♦ ♦ ♦♦♦♦
0.0
oti° oti° oti oti oti' oti' oti° oti° oti°
tiIIKII
Summary
Statistics
n
1030
Avg
17.11
SD
5.97
Min
4.90
Max
26.90
Summary
Statistics
n
48
Avg
9.91
SD
3.30
Min
1.01
Max
21.80
Summary
Statistics
n
48
Avg
2.11
SD
1.18
Min
0.10
Max
5.55
Page 3 of 5 GB Perlmutter, 4/30/2020

Pilot Mountain WWTP Effluent Monitoring NC0O26646
10.0
9.0
8.0
H 7.0
6.0
5.0
4.0
pH
♦ Effluent — — — L. Limit U. Limit
Oti0 O,� QP O5� O,O O,O 0 OHO
Total Copper
350 — —
300
250
200
ao
:L 150
100
50
0
OHO QN, O�� O,� OP O,� O,O OHO O0O
200
180
160
140
J 120
100
:L 80
60
40
20
0
tiO
ti
Total Zinc
OHO Q,� O�� OOO 0 OHO O,O OHO
Summary
Statistics
n
210
Avg
6.93
SD
0.14
Min
6.60
Max
7.50
Summary
Statistics
n
17
Avg
135
SD
87
Min
12
Max
318
Summary
Statistics
n
17
Avg
56
SD
42
Min
10
Max
178
Page 4 of 5 GB Perlmutter, 4/30/2020

Pilot Mountain WWTP Effluent Monitoring NC0026646
Total Residual Chlorine (TRC)
♦ Effluent Limit Compliant
54
44
34 - -
:- 24 - -
14 �♦
4
(P ON O,O <S� z;, ('N 0 0 0 OHO
Summary Statistics
n 411
Avg 13
SD 2
Min 9
Max 18
Page 5 of 5 GB Perlmutter, 4/30/2020

Pilot Mtn WWTP (NC0026646) DMR COMMENTS
June 2016
We had a fecal violation on the 21st, this was caused by equipment failure in our disinfection system,
this was fixed that day and we were back in compliance the next sample period.
March 701R
We had a fecal violation on March 27th, this was due to our disinfection system was down for repair for
a few hours. We were back in compliance the following sample period.
August 2018
We had a fecal violation on the 28th, this was due to a chlorine regulator malfunction, it was repaired
and we were back in compliance the next sample period.

NCO026646
BOD monthly r
Month
RR (%)
April-16
97.98
May-16
96.58
June-16
99.09
July-16
98.21
August-16
98.47
September-16
98.20
October-16
99.20
November-16
99.05
December-16
98.96
January-17
96.06
February-17
98.51
March-17
98.68
April-17
95.36
May-17
98.12
June-17
99.28
July-17
98.72
August-17
99.30
September-17
99.09
October-17
99.28
November-17
97.43
December-17
98.30
January-18
93.57
February-18
88.29
March-18
90.76
April-18
95.31
May-18
95.45
June-18
96.47
July-18
96.89
August-18
97.93
September-18
96.26
Pilot Mountain WWTP Outfall 0
emoval rate
Month
RR (%)
Month
October-18
97.64
April-16
November-18
95.79
May-16
December-18
96.10
June-16
January-19
97.77
July-16
February-19
96.90
August-16
March-19
98.00
September-
April-19
94.38
October-1
May-19
96.98
November-
June-19
97.37
December-
July-19
98.30
January-1
August-19
99.09
February-1
September-19
99.24
March-17
October-19
98.74
April-17
November-19
98.34
May-17
December-19
97.74
June-17
January-20
97.87
July-17
February-20
95.88
August-17
March-20
95.28
September-
April-20
October-1
May-20
November-
June-20
December-
July-20
January-1
August-20
February-1
September-20
March-18
October-20
April-18
November-20
May-18
December-20
June-18
January-21
#N/A
July-18
February-21
#N/A
August-18
March-21
#N/A
September-
1
TSS monthly ri
6
16
16
7
7
17
17
8
RR (%)
88.32
91.01
96.36
92.39
93.22
16
95.52
95.46
88.92
90.68
84.18
7
94.12
89.14
85.26
89.46
95.80
94.23
93.47
17
93.30
94.06
87.92
90.82
80.49
8
65.64
69.19
85.05
87.51
97.27
93.60
89.73
18
91.65
4/23/2020
?moval rate
Month
October-18
Novem ber-18
December-18
January-19
February-19
March-19
April-19
May-19
June-19
July-19
August-19
September-19
October-19
Novem ber-19
December-19
January-20
February-20
March-20
April-20
May-20
June-20
July-20
August-20
September-20
October-20
Novem ber-20
December-20
January-21
February-21
March-21
RR (%)
93.72
61.82
89.31
91.40
87.90
94.90
85.45
93.47
90.25
94.86
93.82
93.70
91.07
92.10
75.41
83.68
78.68
85.71
#N/A
#N/A
#N/A
Summary Statistics
BOD removal rate
n
48
Avg
97.21
SD
2.18
Min
88.29
Max
99.30
TSS removal rate
n
48
Avg
88.77
SD
7.67
Min
61.82
Max
97.27
No. removals < 85%

Overall BOD removal rate #N/A I Overall TSSD removal rate #N/A

Pilot Mountain WWTP Instream Monitoring NC0026646
Dissolved oxvaen (DO) (ma/L
Date
Upstream
Dnstream
Effluent
Standard
2016-04-17
9
9.4
5
2016-04-19
6.23
5
2016-05-15
8.1
8.3
5
2016-05-17
6.38
5
2016-05-28
7.7
8.1
5
2016-05-31
6.51
5
2016-06-12
6.7
7.1
5
2016-06-14
6.02
5
2016-06-27
6.7
6.9
5
2016-06-28
6.23
5
2016-07-17
6.6
6.9
5
2016-07-19
6.37
5
2016-07-26
6.12
5
2016-07-28
6.4
6.6
5
2016-08-14
6.4
6.7
5
2016-08-16
6.01
5
2016-08-29
6.6
7.4
5
2016-08-30
5.44
5
2016-09-18
6.9
7.2
5
2016-09-20
6.33
5
2016-09-27
6
5
2016-09-29
6.7
7.1
5
2016-10-16
7.9
8.2
5
2016-10-18
6.31
5
2016-11-13
9.7
10.1
5
2016-11-15
6.36
5
2016-12-11
10.2
10.6
5
2016-12-13
6.26
5
2017-01-16
10
10.5
5
2017-01-17
6.81
5
2017-02-12
9.1
10
5
2017-02-14
5.97
5
2017-03-26
9.2
9.7
5
2017-03-28
5.9
5
2017-04-23
7
7.2
5
2017-04-25
5.33
5
2017-05-07
7
7.5
5
2017-05-22
6.8
7.1
5
2017-05-23
6.03
5
2017-06-18
6.7
7
5
2017-06-20
5.53
5
2017-06-27
5.48
5
2017-06-29
6.8
7.2
5
2017-07-16
6.6
6.8
5
2017-07-18
5.47
5
2017-07-25
5.39
5
2017-07-27
6.3
6.5
5
2017-08-13
6.8
7.1
5
Page 1of 3 GB Perlmutter 4/29/2020

Pilot Mountain WWTP Instream Monitoring NC0026646
Dissolved oxvaen (DO) (ma/L
Date
Upstream
Dnstream
Effluent
Standard
2017-08-15
5.82
5
2017-08-22
5.64
5
2017-08-24
6.3
6.6
5
2017-09-17
6.7
7.1
5
2017-09-19
6.13
5
2017-09-26
6.13
5
2017-09-28
6.5
7.1
5
2017-10-15
6.8
7.3
5
2017-10-17
6.12
5
2017-11-12
8.8
10
5
2017-11-14
8.15
5
2017-12-10
10.2
11
5
2017-12-12
8.03
5
2018-01-21
9.1
9.8
5
2018-02-18
9.5
10.1
5
2018-02-20
8.87
5
2018-03-18
9.3
9.9
5
2018-03-20
7.93
5
2018-04-08
9.2
9.6
5
2018-04-10
8.1
5
2018-05-13
6.8
7.3
5
2018-05-15
7.08
5
2018-05-29
7.27
5
2018-05-30
6.6
7.1
5
2018-06-17
6.8
7.1
5
2018-06-19
6.74
5
2018-06-28
6.4
7.1
5
2018-07-15
6.6
7.1
5
2018-07-17
6.23
5
2018-07-24
6.32
5
2018-07-26
6.5
7.2
5
2018-08-07
6.28
5
2018-08-10
8.2
7.7
5
2018-08-26
6.6
7.2
5
2018-08-28
7.04
5
2018-09-18
7.03
5
2018-09-19
8.8
8.3
5
2018-09-29
8.7
8.3
5
2018-10-02
7.29
5
2018-10-16
9.2
9.3
7.21
5
2018-11-06
10.1
10.1
8.46
5
2018-12-04
11.6
11.7
9.84
5
2019-01-08
10.2
10.3
9.96
5
2019-02-05
10.4
10.5
10.12
5
2019-03-05
11.8
11.5
10.08
5
2019-04-09
10.3
10.6
10.76
5
2019-04-30
8.72
5
2019-05-01
9.4
9.5
5
Page 2of 3 GB Perlmutter 4/29/2020

Pilot Mountain WWTP Instream Monitoring NCO026646
Dissolved oxvaen (DO) (ma/L
Date
Upstream
Dnstream
Effluent
2019-05-21
9.6
9.3
8.73
2019-06-03
9.8
9.4
2019-06-04
8.55
2019-06-18
8.3
8.7
7.95
2019-07-09
8.4
8.2
7.69
2019-07-22
8.5
7.6
2019-07-23
7.84
2019-08-06
8.4
8
7.64
2019-08-20
8.8
8.4
7.26
2019-09-03
7.42
2019-09-04
8.3
8.1
2019-09-24
9.2
9.1
7.27
2019-10-15
10.7
10.2
7.89
2019-11-12
9.2
9.3
9.62
2019-12-10
10.7
11
8.91
N
65
65
62
Avg
8.2
8.5
7.1
SD
1.5
1.5
1.4
Min
6.3
6.5
5.33
Max
11.8
11.7
10.76
Standard
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
t-Test: Paired Two Sample for Means
Upstream
Dnstream
Mean
8.233846
8.475385
Variance
2.358524
2.160322
Observations
65
65
Pearson Correlation
0.967191
Hypothesized Mean Difference
0
df
64
t Stat
-4.98719
P(T<=t) one -tail
2.48E-06
t Critical one -tail
1.669013
P(T<=t) two -tail
4.96E-06
t Critical two -tail
1.99773
Dissolved Oxygen (DO)
• Upstream Dnstream Effluent Standard
14.0
12.0
10.0 j N■ eii■ A
■
8.0
b 1■
4.0 -
2.0 -
0.0
tiA N/ tiA
o°` Q°
ti°moo ti°y� 06 5
Page 3of 3 GB Perlmutter 4/29/2020

Pilot Mountain WWTP Instream Monitoring
N CO026646
Temperature,
water (°Q
Date
Upstream
Dnstream
D-U diff.
Effluent
Standard
4/17/2016
14.3
13.7
-0.6
29
4/18/2016
13.8
29
5/15/2016
16.6
15.6
-1
29
5/16/2016
17.3
29
5/27/2016
19.2
29
5/28/2016
21.7
20.2
-1.5
29
6/12/2016
23.4
22
-1.4
29
6/13/2016
22.3
29
6/27/2016
24.6
23.8
-0.8
23.2
29
7/17/2016
26.2
25.7
-0.5
29
7/18/2016
25
29
7/28/2016
27.6
25.3
-2.3
26.3
29
8/14/2016
27.1
26.1
-1
29
8/15/2016
25.9
29
8/29/2016
25.1
24.1
-1
25.7
29
9/18/2016
25.2
23.4
-1.8
29
9/19/2016
24.9
29
9/29/2016
24.2
23.4
-0.8
29
10/16/2016
16.9
15.8
-1.1
29
10/17/2016
19.4
29
11/13/2016
11.2
10.7
-0.5
29
11/14/2016
13
29
12/11/2016
7.4
6.8
-0.6
29
12/12/2016
10.1
29
1/16/2017
8.3
7.1
-1.2
10.1
29
2/12/2017
10.6
9.8
-0.8
29
2/13/2017
10.9
29
3/26/2017
13.2
12.2
-1
29
3/27/2017
13.1
29
4/23/2017
16.2
15.3
-0.9
29
4/24/2017
16
29
5/7/2017
17.3
16.2
-1.1
29
5/8/2017
17.3
29
5/22/2017
21.2
20.3
-0.9
18.2
29
6/18/2017
26.4
24.6
-1.8
29
6/19/2017
22.2
29
6/29/2017
23.1
22.1
-1
22.9
29
7/16/2017
26.5
26
-0.5
29
7/17/2017
24.7
29
7/25/2017
26.1
29
7/27/2017
27.2
26
-1.2
29
8/13/2017
25.7
25
-0.7
29
8/14/2017
24.2
29
8/24/2017
26.2
25.6
-0.6
26
29
9/17/2017
21.1
19.6
-1.5
29
9/18/2017
22.3
29
9/28/2017
24.9
23.6
-1.3
29
10/15/2017
23.8
22
-1.8
29
10/16/2017
21.7
29
11/12/2017
10.2
9.6
-0.6
29
11/13/2017
14.9
29
12/10/2017
7.2
6.1
-1.1
29
12/11/2017
10.9
29

Pilot Mountain WWTP Instream Monitoring NCO026646
Temperature,
water (°Q
Date
Upstream
Dnstream
D-U diff.
Effluent
Standard
1 /21 /2018
9.4
8.6
-0.8
29
1 /22/2018
7.7
29
2/18/2018
12.5
11.9
-0.6
29
2/19/2018
10.6
29
3/18/2018
11.2
10.4
-0.8
29
3/19/2018
10.8
29
4/8/2018
11.1
10.6
-0.5
29
4/9/2018
12.4
29
5/13/2018
19.1
18.9
-0.2
29
5/14/2018
19.9
29
5/29/2018
22
29
5/30/2018
25.3
23.6
-1.7
29
6/17/2018
26.2
24.3
-1.9
29
6/18/2018
23.4
29
6/28/2018
27.2
25.6
-1.6
23.8
29
7/15/2018
26.3
25.4
-0.9
29
7/16/2018
25.4
29
7/26/2018
26.1
24.9
-1.2
24.2
29
8/10/2018
23.6
24.8
1.2
24.3
29
8/26/2018
26
24.5
-1.5
29
8/27/2018
24.2
29
9/19/2018
21.6
22.3
0.7
23.7
29
9/28/2018
22.9
29
9/29/2018
21.2
21.4
0.2
29
10/16/2018
17.9
18.2
0.3
20.6
29
11 /6/2018
14
14
0
16.1
29
12/4/2018
8.1
8.4
0.3
11.6
29
1 /8/2019
8.9
9
0.1
10.9
29
2/5/2019
8.6
8.5
-0.1
9.6
29
3/5/2019
6.1
7
0.9
10.2
29
4/9/2019
16.3
16.7
0.4
15.8
29
5/1/2019
18.5
19.1
0.6
17.2
29
5/21 /2019
19.2
20.5
1.3
20.9
29
6/3/2019
20.2
21.4
1.2
22.1
29
6/18/2019
20.4
20.6
0.2
22.1
29
7/9/2019
23
24.4
1.4
24.6
29
7/22/2019
23.5
25
1.5
25.9
29
8/6/2019
21.1
22.4
1.3
24.6
29
8/20/2019
24.4
25.3
0.9
25.2
29
9/4/2019
21.5
22.4
0.9
23.8
29
9/24/2019
21.5
22.2
0.7
22.7
29
10/15/2019
14.7
15.5
0.8
18.7
29
11/12/2019
8.7
8.9
0.2
13.9
29
12/10/2019
7.6
7.3
-0.3
12.1
29
N
65
65
65
63
Avg
18.9
18.5
-0.5
19.2
SD
6.7
6.5
1.0
5.6
Min
6.1
6.1
-2.3
7.7
Max
27.6
26.1
1.5
26.3

Pilot Mountain WWTP Instream Monitoring NCO026646
Temperature, water (`Q
Date Upstream Dnstream D-U diff. Effluent Standard
t-Test: Paired Two Sample for Means
Upstream
Dnstream
Mean
18.94769
18.48769
Variance
44.62378
42.70297
Observations
65
65
Pearson Correlation
0.989848
Hypothesized Mean Difference
0
df
64
t Stat
3.893195
P(T<=t) one -tail
0.000119
t Critical one -tail
1.669013
P(T<=t) two -tail
0.000239
t Critical two -tail
1.99773
Temperature
♦ Upstream Dnstream Effluent Standard
35 —
30
25 •, A14-1 A,
Xmp
c� 20 ■
15 !■
fidk
0
V V V 0 C�y
ti

Pilot Mountain WWTP
Instream Monitoring NCO026646
Specific conductance
( S/cm
Date
Upstream
Dnstream
4/17/2016
128
94
5/15/2016
143
98
5/28/2016
114
94
6/12/2016
140
102
6/27/2016
153
110
7/17/2016
138
114
7/28/2016
122
90
8/14/2016
138
102
8/29/2016
155
104
9/18/2016
158
104
9/29/2016
156
107
10/16/2016
137
103
11 /13/2016
139
104
12/11 /2016
134
109
1/16/2017
132
96
2/12/2017
156
103
3/26/2017
153
117
4/23/2017
140
90
5/7/2017
137
96
5/22/2017
138
104
6/18/2017
139
102
6/29/2017
153
103
7/16/2017
147
109
7/27/2017
162
109
8/13/2017
153
104
8/24/2017
162
110
9/17/2017
145
104
9/28/2017
136
102
10/15/2017
136
103
11 /12/2017
147
90
12/10/2017
126
95
1 /21 /2018
132
103
2/18/2018
138
96
3/18/2018
143
106
4/8/2018
135
94
5/13/2018
128
108
5/30/2018
162
119
6/17/2018
138
101
6/28/2018
165
117
7/15/2018
146
109
7/26/2018
149
107
8/10/2018
70
76
8/26/2018
137
104
9/19/2018
60
64
9/29/2018
62
65
10/16/2018
62
81
11 /6/2018
61
66
12/4/2018
56
68
1 /8/2019
54
65
2/5/2019
52
50
3/5/2019
50
62
4/9/2019
52
55
5/1/2019
50
55
Page 1 of 2 GB Perlmutter 4/29/2020

Pilot Mountain WWTP Instream Monitoring NCO026646
Specific conductance (PS/cm)
Date
Upstream
Dnstream
5/21 /2019
53
65
6/3/2019
53
55
6/18/2019
52
57
7/9/2019
59
67
7/22/2019
58
88
8/6/2019
61
75
8/20/2019
60
74
9/4/2019
59
70
9/24/2019
60
81
10/15/2019
58
50
11 /12/2019
61
50
12/10/2019
56
66
N
65
65
Avg
112.4
89.9
SD
42.2
20.1
Min
50
50
Max
165
119
t-Test: Paired Two Sample for Means
Upstream
Dnstream
Mean
112.4462
89.86154
Variance
1783.063
402.2149
Observations
65
65
Pearson Correlation
0.933115
Hypothesized Mean Difference
0
df
64
t Stat
7.403703
P(T<=t) one -tail
1.81 E-10
t Critical one -tail
1.669013
P(T<=t) two -tail
3.63E-10
t Critical two -tail
1.99773
Up- and dnstream sites combined
Before 9/2018 Since 9/2018
86
44
121.8
60.9
23.0
8.9
70
50
165
88
Specific Conductance
♦ Upstream Dnstream
180
100Ln .• _� ._• ••�.
80 • ---i •• —�� •
60 AL
40 16
AA
20
0
tit ly y1 tit
O� O�
tiO,y<d tiO,y'\' ti0,4i ti0y�
Page 2 of 2 GB Perlmutter 4/29/2020

Pilot Mountain WWTP
Instream Monitoring NCO026646
Fecal coliform W61100 mL)
Date Upstream Dnstream
Effluent
4/17/2016 82
60
4/19/2016
1
5/15/2016 110
62
5/18/2016
1
6/12/2016 104
60
6/14/2016
6
7/17/2016 210
70
7/19/2016
2420
8/14/2016 154
84
8/16/2016
1
9/18/2016 131
80
9/20/2016
1
10/16/2016 154
64
10/18/2016
1
11 /13/2016 100
62
11/15/2016
1
12/11 /2016 114
64
12/13/2016
57
1/16/2017 88
64
1/17/2017
1
2/12/2017 108
72
2/14/2017
2420
3/26/2017 106
86
3/28/2017
1
4/23/2017 200
114
4/25/2017
2420
5/7/2017 82
54
5/9/2017
1
6/18/2017 114
56
6/20/2017
1
7/16/2017 100
62
7/18/2017
1
8/13/2017 108
62
8/15/2017
1
9/17/2017 84
64
9/19/2017
1
10/15/2017 86
52
10/17/2017
1
11 /12/2017 86
46
11/14/2017
1
12/10/2017 98
60
12/12/2017
1
1 /21 /2018 94
60
1 /23/2018
1
2/18/2018 82
58
2/20/2018
1
3/18/2018 86
58
3/20/2018
1
4/8/2018 82
60
4/10/2018
1
5/13/2018 88
58
5/15/2018
1
6/17/2018 86
62
Page 1 of 2 GB Perlmutter 4/29/2020

Pilot Mountain WWTP Instream Monitoring NCO026646
Fecal coliform W61100 mL)
Date
Upstream Dnstream
Effluent
6/19/2018
1
7/15/2018
94
62
7/17/2018
1
8/26/2018
94
70
8/28/2018
748
9/19/2018
520
510
9/21 /2018
1
10/16/2018
560
550
1
11 /6/2018
9800
6000
1
12/4/2018
791
580
6
1 /8/2019
136
58
1
2/5/2019
56
58
1
3/5/2019
66
64
1
4/9/2019
270
144
1550
5/21 /2019
440
360
1
6/18/2019
6000
9200
2420
7/9/2019
764
400
1
8/20/2019
430
80
1
9/24/2019
86
96
1
10/15/2019
110
64
1
11 /12/2019
655
159
1
12/10/2019
5700
510
1
N
45
45
45
Geomean
180
108
3
Min
56
46
1
Max
9800
9200
2420
Fecal Coliform
♦ Upstream Dnstream ■ Effluent
10,000
t
E
1,000
�♦ •♦ y
100
�i ji>�� �� i� ���
•!■ • •
u
10
■ _
■
1
tiA
ti^ by
by
�0N�
Page 2 of 2 GB Perlmutter 4/29/2020

MONITORING REPORT(MR) VIOLATIONS for:
Report Date: 08/26/2C Page
1 of 2
Permit:
NCO026646
MRS Betweei
5 - 2015 and 8 - 2020
Region:
%
Violation Category:%
Program Category:
Facility Name: %
Param Nam(%
County:
%
Subbasin: %
Violation Action: %
Major Minor:
%
PERMIT: NCO026646
FACILITY: Town of Pilot Mountain - Pilot Mountain WWTP
COUNTY: Surry REGION: Winston-Salem
Limit Violation
MONITORING
VIOLATION
UNIT OF
CALCULATED %
REPORT
OUTFALL
LOCATION
PARAMETER
DATE
FREQUENCY
MEASURE
LIMIT
VALUE Over VIOLATION TYPE
VIOLATION ACTION
09-2015
001
Effluent
Coliform, Fecal MF, MFC
09/26/15
Weekly
#/100ml
400
800 100 Weekly Geometric Mean
Proceed to NOV
Broth, 44.5 C
Exceeded
10-2015
001
Effluent
Coliform, Fecal MF, MFC
10/17/15
Weekly
#/100ml
400
2,420 505 Weekly Geometric Mean
Proceed to NOV
Broth, 44.5 C
Exceeded
06-2016
001
Effluent
Coliform, Fecal MF, MFC
06/25/16
Weekly
#/100ml
400
2,450 512.5 Weekly Geometric Mean
Proceed to NOV
Broth, 44.5 C
Exceeded
03-2018
001
Effluent
Coliform, Fecal MF, MFC
03/31/18
Weekly
#/100ml
400
1,990 397.5 Weekly Geometric Mean
Proceed to NOV
Broth, 44.5 C
Exceeded
09-2018
001
Effluent
Coliform, Fecal MF, MFC
09/01/18
Weekly
#/100ml
400
748 87 Weekly Geometric Mean
Proceed to NOV
Broth, 44.5 C
Exceeded
02-2016
001
Effluent
Solids, Total Suspended -
02/20/16
Weekly
mg/I
45
50 11.1 Weekly Average
Proceed to NOV
Concentration
Exceeded
Monitoring Violation
MONITORING
VIOLATION
UNIT OF
CALCULATED %
REPORT
OUTFALL
LOCATION
PARAMETER
DATE
FREQUENCY
MEASURE
LIMIT
VALUE Over VIOLATION TYPE
VIOLATION ACTION
06-2015
001
Effluent
Oxygen, Dissolved (DO)
06/27/15
Weekly
mg/I
Frequency Violation
No Action, BPJ
07-2015
001
Effluent
Oxygen, Dissolved (DO)
07/04/15
Weekly
mg/I
Frequency Violation
No Action, BPJ
03-2018
001
Effluent
Oxygen, Dissolved (DO)
03/03/18
Weekly
mg/I
Frequency Violation
No Action, BPJ
05 - 2015
001
Effluent
Temperature, Water Deg.
05/30/15
5 X week
deg c
Frequency Violation
No Action, BPJ
Centigrade
07 - 2015
001
Effluent
Temperature, Water Deg.
07/04/15
5 X week
deg c
Frequency Violation
No Action, BPJ
Centigrade
10-2015
001
Effluent
Temperature, Water Deg.
10/31/15
5 X week
deg c
Frequency Violation
No Action, BPJ
Centigrade
11 -2015
001
Effluent
Temperature, Water Deg.
11/14/15
5 X week
deg c
Frequency Violation
No Action, BPJ
Centigrade
11 -2015
001
Effluent
Temperature, Water Deg.
11/28/15
5 X week
deg c
Frequency Violation
No Action, BPJ
Centigrade

MONITORING REPORT(MR) VIOLATIONS for:
Report Date:
08/26/2C Page
2 of 2
Permit:
NCO026646
MRS Betweel
5 - 2015 and 8 - 2020
Region:
%
Violation Category:%
Program Category: %
Facility Name: %
Param Nam(%
County:
%
Subbasin: %
Violation Action: %
Major Minor:
%
PERMIT: NCO026646
FACILITY: Town of Pilot Mountain - Pilot Mountain WWTP
COUNTY: Surry
REGION: Winston-Salem
Monitoring Violation
MONITORING
REPORT
OUTFALL
LOCATION
PARAMETER
VIOLATION
DATE
FREQUENCY
UNIT OF CALCULATED %
MEASURE LIMIT VALUE Over
VIOLATION TYPE
VIOLATION ACTION
12 - 2015
001
Effluent
Temperature, Water Deg.
12/26/15
5 X week
deg c
Frequency Violation
No Action, BPJ
Centigrade
01 -2016
001
Effluent
Temperature, Water Deg.
01/02/16
5 X week
deg c
Frequency Violation
No Action, BPJ
Centigrade
07 - 2016
001
Effluent
Temperature, Water Deg.
07/09/16
5 X week
deg c
Frequency Violation
No Action, BPJ
Centigrade
11 -2016
001
Effluent
Temperature, Water Deg.
11/26/16
5 X week
deg c
Frequency Violation
No Action, BPJ
Centigrade
07 - 2017
001
Effluent
Temperature, Water Deg.
07/29/17
5 X week
deg c
Frequency Violation
No Action, BPJ
Centigrade
08 - 2017
001
Effluent
Temperature, Water Deg.
08/05/17
5 X week
deg c
Frequency Violation
No Action, BPJ
Centigrade
09 - 2017
001
Effluent
Temperature, Water Deg.
09/02/17
5 X week
deg c
Frequency Violation
No Action, BPJ
Centigrade
12 - 2017
001
Effluent
Temperature, Water Deg.
12/30/17
5 X week
deg c
Frequency Violation
No Action, BPJ
Centigrade
03 - 2018
001
Effluent
Temperature, Water Deg.
03/03/18
5 X week
deg c
Frequency Violation
No Action, BPJ
Centigrade
06 - 2018
001
Effluent
Temperature, Water Deg.
06/02/18
5 X week
deg c
Frequency Violation
No Action, BPJ
Centigrade
02 - 2019
001
Effluent
Temperature, Water Deg.
02/02/19
5 X week
deg c
Frequency Violation
No Action, BPJ
Centigrade
03-2019
001
Effluent
Temperature, Water Deg.
03/02/19
5 X week
deg c
Frequency Violation
Proceed to NOD
Centigrade
11 -2019
001
Effluent
Temperature, Water Deg.
11/02/19
5 X week
deg c
Frequency Violation
Proceed to NOD
Centigrade

Whole Effluent Toxicity Testing and Self Monitoring Summary
Pilot Mountain WWTP
NCO026646/001 County:
Surry
Region:
WSRO
Basin:
YAD03
Jan Apr Jul Oct
SOC JOC:
Ceri7dPF
Begin:
3/1/2014
Chr Lim: 0.5 MGD @
NonComp: Single
7Q10: 82.2
PF: 1.5
IWC: 2.75
Freq: Q
J
F M
A M
J
J
A
S
O
N
D
2016
Pass
- -
Pass -
-
Pass
-
-
Pass
-
-
2017
Pass
- -
Pass -
-
Pass
-
-
Pass
-
-
2018
Pass
- -
Pass -
-
Pass
-
-
Pass
-
-
2019
Pass
- -
Pass -
-
Pass
-
-
Pass
-
-
2020
Pass
- -
- -
-
-
-
-
-
-
-
Pine Knoll Shores WTP
NCO082520/001 County:
Carteret
Region:
WIRO
Basin:
WOK03
Feb May Aug Nov
SOC JOC:
Mysd24PF
Begin:
8/1/2017
Ac P/F Lim: 90%Mysi
NonComp:
70,10:
PF: 1.2
IWC:
Freq: Q
J
F M
A M
J
J
A
S
O
N
D
2016
-
H -
- H
-
-
H
-
-
H
-
2017
-
H -
- H
-
-
H
-
-
H
-
2018
-
H -
- H
-
-
H
-
-
H
-
2019
-
H -
- H
-
-
H
-
-
H
-
2020
-
H -
- -
-
-
-
-
-
-
-
Pine Street WTP
NCO072699/001 County:
Carteret
Region:
WIRO
Basin:
WOK03
Mar Jun Sep Dec
SOC JOC:
Mysd24PF
Begin:
3/1/2018
Ac P/F Monit: 90% M
NonComp:
7Q10:
PF: na
IWC:
Freq: Q
J
F M
A M
J
J
A
S
O
N
D
2016
-
- Pass
- -
Pass
-
-
Pass
-
-
Pass
2017
-
- Pass
- -
Pass
-
-
Pass
-
-
Pass
2018
-
- Pass
- -
Fail
-
-
Fail
-
-
Fail
2019
-
- Fail
- -
Fail
-
-
Fail
-
-
Fail
Pittsboro WTP
NCO080896/001 County:
Chatham
Region:
RRO
Basin:
CPF04
Jan Apr Jul Oct
SOC JOC:
Ceri7dPF
Begin:
4/1/2017
Chr Monit: 0.27%
NonComp:
7Q10:
PF:
IWC:
Freq: Q
J
F M
A M
J
J
A
S
O
N
D
2016
Pass
- -
Pass -
-
Pass
-
-
Pass
-
-
2017
Pass
- -
Pass -
-
Pass
-
-
Pass
-
-
2018
Pass
- -
Pass -
-
Pass
-
-
Pass
-
-
2019
Pass
- -
Pass -
-
Pass
-
-
Pass
-
-
2020
Pass
- -
- -
-
-
-
-
-
-
-
Pittsboro WWTP
NCO020354/001 County:
Chatham
Region:
RRO
Basin:
CPF04
Mar Jun Sep Dec
SOC JOC:
Ceri7dPF
Begin:
8/15/2014 chr lim: 90%
NonComp: Single
7Q10: 0.000
PF: 0.75
IWC: 100
Freq: Q
J
F M
A M
J
J
A
S
O
N
D
2016
-
- Pass
- -
Pass
-
-
Pass
-
-
Pass
2016
-
- H
- -
-
-
-
H
-
-
H
2017
-
- Pass
- -
Pass
-
-
Pass
-
-
Pass
2017
-
- H
- -
-
-
-
H
-
-
-
2018
-
- H
- -
H
-
-
H
-
-
H
2018
-
- Pass
- -
Pass
-
-
Pass
-
-
Pass
2019
-
- H
- -
H
-
-
H
-
-
H
2019
-
- Pass
- -
Pass
-
-
Pass
-
-
Pass
2020
-
- Pass
- -
-
-
-
-
-
-
-
Leeend: P= Fathead minnow
(Pimohales
oromelas). H=No Flow (facilitv is active). s = Solit test between Certified
Labs
Page 87 of 120

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 NC0026646 111 121 19/01/08 I17 18 LC] I 19 I s 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
I 72 I n, I 71 I 74 79 I I I I I I I80
701 I 71 I LL -1 I I
LJ
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)
09:OOAM 19/01/08
14/03/01
Pilot Mountain WWTP
Lynchburg Rd
Exit Time/Date
Permit Expiration Date
Pilot Mountain NC 27041
11:OOAM 19/01/08
19/02/28
Name(s) of Onsite Representative(s)/Titles(s)/Phone and Fax Number(s)
Other Facility Data
Edwin K Scott/ORC/336-368-4041/
Name, Address of Responsible Official/Title/Phone and Fax Number
Contacted
Michael Boaz,124 W Main St Pilot Mtn NC 27041//336-444-3000/3363689532
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 Effluent/Receiving Wate
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
Gary Hudson DWR/Division of Water Qua Iity/336-776-9694/
Signature of Management Q A Reviewer Agency/Office/Phone and Fax Numbers Date
EPA Form 3560-3 (Rev 9-94) Previous editions are obsolete.
Page#

NPDES yr/mo/day Inspection Type
NCO026646 I11 12I 19/01 /08 117 18 i c i
Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary)
Page#

Permit: NCO026646 Owner -Facility: Pilot Mountain WWTP
Inspection Date: 01/08/2019 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?
E
❑
❑
❑
Comment: .
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 ❑ ❑ ❑
Solids, pH, DO, Sludge Judge, and other that are applicable?
Comment: .
Record Keeping
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 operatc
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?
Yes No NA NE
❑ ❑ ❑
❑ ❑ ❑
❑ ❑ ❑
■ ❑ ❑ ❑
❑ ❑ ❑
❑ ❑ ❑
❑ ❑ ❑
❑ ❑ N ❑
❑ ❑ ❑
❑ ❑ ❑
❑ ❑ ❑
❑ ❑ ❑
Page# 3

Permit: NCO026646 Owner -Facility: Pilot Mountain WWTP
Inspection Date: 01/08/2019 Inspection Type: Compliance Evaluation
Record Keeping Yes No NA NE
Facility has copy of previous year's Annual Report on file for review? 0 ❑ ❑ ❑
Comment: .
Pump Station - Influent
Yes
No
NA
NE
Is the pump wet well free of bypass lines or structures?
0
❑
❑
❑
Is the wet well free of excessive grease?
0
❑
❑
❑
Are all pumps present?
0
❑
❑
❑
Are all pumps operable?
0
❑
❑
❑
Are float controls operable?
0
❑
❑
❑
Is SCADA telemetry available and operational?
❑
❑
0
❑
Is audible and visual alarm available and operational?
0
❑
❑
❑
Comment: .
Bar Screens
Yes
No
NA
NE
Type of bar screen
a.Manual
b.Mechanical
❑
Are the bars adequately screening debris?
0
❑
❑
❑
Is the screen free of excessive debris?
0
❑
❑
❑
Is disposal of screening in compliance?
0
❑
❑
❑
Is the unit in good condition?
❑
❑
❑
Comment: .
Oxidation Ditches
Yes
No
NA
NE
Are the aerators operational?
0
❑
❑
❑
Are the aerators free of excessive solids build up?
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?
❑
❑
❑
Are settleometer results acceptable (> 30 minutes)?
0
❑
❑
❑
Is the DO level acceptable?(1.0 to 3.0 mg/1)
❑
❑
❑
Are settelometer results acceptable?(400 to 800 ml/I in 30 minutes)
0
❑
❑
❑
Comment: .
Page# 4

Permit: NC0026646 Owner -Facility: Pilot Mountain WWTP
Inspection Date: 01/08/2019 Inspection Type: Compliance Evaluation
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?
0
❑
❑
❑
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)?
0
❑
❑
❑
Is the overflow clear of excessive solids/pin floc?
0
❑
❑
❑
Is the sludge blanket level acceptable? (Approximately'/ of the sidewall depth)
0
❑
❑
❑
Comment: .
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?
0
❑
❑
❑
# Is the odor acceptable?
0
❑
❑
❑
# Is tankage available for properly waste sludge?
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)
0
❑
❑
❑
Is the level of chlorine residual acceptable?
0
❑
❑
❑
Is the contact chamber free of growth, or sludge buildup?
0
❑
❑
❑
Is there chlorine residual prior to de -chlorination?
0
❑
❑
❑
Comment: .
De -chlorination Yes No NA NE
Type of system ? Gas
Is the feed ratio proportional to chlorine amount (1 to 1)? 0❑ ❑ ❑
Page# 5

Permit: NC0026646
Inspection Date: 01/08/2019
Owner -Facility: Pilot Mountain WWTP
Inspection Type: Compliance Evaluation
De -chlorination
Is storage appropriate for cylinders?
# Is de -chlorination substance stored away from chlorine containers?
Comment: .
Are the tablets the proper size and type?
Are tablet de -chlorinators operational?
Number of tubes in use?
Comment: .
Flow Measurement - Effluent
# Is flow meter used for reporting?
Is flow meter calibrated annually?
Is the flow meter operational?
(If units are separated) Does the chart recorder match the flow meter?
Comment: .
Pump Station - Effluent
Is the pump wet well free of bypass lines or structures?
Are all pumps present?
Are all pumps operable?
Are float controls operable?
Is SCADA telemetry available and operational?
Is audible and visual alarm available and operational?
Comment: .
Yes
No
NA
NE
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
Yes No NA NE
❑ ❑ ❑
❑ ❑ ❑
■ ❑ ❑ ❑
■ ❑ ❑ ❑
Yes
No
NA
NE
❑
❑
❑
❑
❑
❑
❑
❑
❑
■
❑
❑
❑
Page# 6

NH3/TRC WLA Calculations
Pilot Mountain WWTP
PermitNo. NCO026646
Prepared By: Gary Perlmutter
Enter Design Flow (MGD): 0.5
Enter s7Q10 (cfs): 82.2
Enter w7Q10 (cfs): 163
Total Residual Chlorine (TRC)
Daily Maximum Limit (ug/1)
Ammonia (Summer)
Monthly Average Limit (mg NH3-N/1)
s7Q10 (CFS)
82.2
s7Q10 (CFS)
82.2
DESIGN FLOW (MGD)
0.5
DESIGN FLOW (MGD)
0.5
DESIGN FLOW (CFS)
0.775
DESIGN FLOW (CFS)
0.775
STREAM STD (UG/L)
17.0
STREAM STD (MG/L)
1.0
Upstream Bkgd (ug/1)
0
Upstream Bkgd (mg/1)
0.22
IWC (%)
0.93
IWC (%)
0.93
Allowable Conc. (ug/1)
1820
Allowable Conc. (mg/1)
83.7
Ammonia (Winter)
Monthly Average Limit (mg NH3-N/1)
Fecal Coliform
w7Q10 (CFS)
163
Monthly Average Limit:
200/100ml DESIGN FLOW (MGD)
0.5
(If DF >331; Monitor)
DESIGN FLOW (CFS)
0.775
(If DF<331; Limit)
STREAM STD (MG/L)
1.8
Dilution Factor (DF)
107.06 Upstream Bkgd (mg/1)
0.22
IWC (%)
0.47
Allowable Conc. (mg/1)
334.1
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); capped at 35 mg/I
3. Monthly Avg limit x 5 = Daily Max limit (Non-Munis); capped at 35 mg/I
Fecal Coliform
1. Monthly Avg limit x 2 = 400/100 ml = Weekly Avg limit (Municipals) = Daily Max limit (Non -Muni)

NH3/TRC WLA Calculations
Pilot Mountain WWTP
PermitNo. NCO026646
Prepared By: Gary Perlmutter
Enter Design Flow (MGD): 1.5
Enter s7Q10 (cfs): 82.2
Enter w7Q10 (cfs): 163
Total Residual Chlorine (TRC)
Daily Maximum Limit (ug/1)
Ammonia (Summer)
Monthly Average Limit (mg NH3-N/1)
s7Q10 (CFS)
82.2
s7Q10 (CFS)
82.2
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 (%)
2.75
IWC (%)
2.75
Allowable Conc. (ug/1)
618
Allowable Conc. (mg/1)
28.6
Ammonia (Winter)
Monthly Average Limit (mg NH3-N/1)
Fecal Coliform
w7Q10 (CFS)
163
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)
36.35 Upstream Bkgd (mg/1)
0.22
IWC (%)
1.41
Allowable Conc. (mg/1)
112.6
Total Residual Chlorine
1. Cap Daily Max limit at 28 ug/I to protect for acute toxicity
Ammonia (as NH3-N)
1. If Allowable Conc > 35 mg/I, Monitor Only
2. Monthly Avg limit x 3 = Weekly Avg limit (Municipals); capped at 35 mg/I
3. Monthly Avg limit x 5 = Daily Max limit (Non-Munis); capped at 35 mg/I
Fecal Coliform
1. Monthly Avg limit x 2 = 400/100 ml = Weekly Avg limit (Municipals) = Daily Max limit (Non -Muni)

RESEARCh & ANA1yTICA1
LABORATORIES, INC.
For: Town of Pilot Mountain WWTP
124 West Main Street
Pilot Mountain, NC 27041
Attn: Kent Scott
Report of Analysis
5/13/2020
NC#34
NC#37701
Client Sample ID: Upstream Lab Sample ID: 81926-01
Site: Town of Pilot Mtn Collection Date: 5/4/2020 7:00
Parameter Method Result Units Reg) Limit Analyst Analysis Daterrime
Hardness, Total SM 2340 C-2011 14.6 mg/L 1 AB 5/12/2020
Client Sample ID: Effluent
Site: Town of Pilot Mtn
Parameter Method
Hardness, Total SM 2340 C-2011
Lab Sample ID: 81926-02
Collection Date: 5/4/2020 7:15
Result Units Reg) Limit Analst Analysis DatelTime
28.1 mg/L 1 AB 5/12/2020
Client Sample ID: Upstream Lab Sample ID: 81926-03
Site: Town of Pilot Mtn Collection Date: 5/5/2020 7:00
Parameter Method Result Units Reg) Limit Analyst Analysis Date/Time
Hardness, Total SM 2340 C-2011 11.4 mg/L 1 AB 5/12/2020
Client Sample ID: Effluent Lab Sample ID: 81926-04
Site: Town of Pilot Mtn Collection Date: 5/5/2020 7:15
Parameter Method Result Units Reg) Limit Anal st Analysis Datelrime
Hardness. Total SM 2340 C-2011 28.1 mg/L 1 AB 5/1212020
Client Sample ID: Upstream Lab Sample ID: 81926-05
Site: Town of Pilot Mtn Collection Date: 5/6/2020 7:00
Parameter Method Result Units Rep Limit Analst Analysis Date/Time
Hardness, Total SM 2340 C-2011 12.5 mg/L 1 AB 5/12/2020
P.O. Box 473 106 Short Street Kernersville, North Carolina 27284 Tel [phone] Fax: [phone] www.randalabs.com Page 1
ral coa basic vid

RESEARCh & ANALyTICAL
LAboRATORIES, INC.
Client Sample ID: Effluent
Site: Town of Pilot Mtn
Parameter
Hardness, I
Method
Report of Analysis
5/13/2020
Lab Sample ID: 81926-06
Collection Date: 5/6/2020 7:15
Result Units Rep Limit Analyst Analysis Date/Time
SM 2340 C-2011 29.1 mg/L 1 Hu of
Client Sample ID: Upstream
Site: Town of Pilot Mtn
Parameter
Method
Lab Sample ID: 81926-07
Collection Date: 5/7/2020 7:00
Result Units Rep Limit Anal st Analysis Date/Time
Hardness, Total SM 2340 C-2011 13.5 mg/L 1 Ala onu/uZu
Client Sample ID: Effluent Lab Sample ID: 81926-08
Site: Town of Pilot Mtn Collection Date: 5/7/2020 7:15
Parameter Method Result Units Rep Limit Analyst Analysis Date/Time
Hardness, Total SM 2340 C-2011 28.1 mg/L 1 AB 5/12/2020
Client Sample ID: Upstream Lab Sample ID: 81926-09
Site: Town of Pilot Mtn Collection Date: 5/8/2020 7:00
Parameter Method Result Units Rep Limit Analyst Analysis-Date/Time
Hardness, Total SM 2340 C-2011 13.5 mg/L 1 AB 5/1212020
Client Sample ID: Effluent Lab Sample ID: 81926-10
Site: Town of Pilot Mtn Collection Date: 5/8/2020 7:15
Parameter Method Result Units Rep Limit Anal st Analysis Date/Time
Hardness, Total SM 2340 C-2011 29.1 mg/L 1 AB 5/12/2020
NA = not analyzed
P.O. Box 473 106 Short Street Kernersville, North Carolina 27284 Tel: [phone] Fax: [phone] www.randalabs.com Page 2

RESEARCH & ANAIY] iCAI
LAbORAIORIES, INC. CHAIN OF CUSTODY RECORD
l\nalytical / Pr(jcoL;;; Consultations
Phone [phone]
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COMPANY -JOB NO001/
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L U — ISAMI'LI I1MIIERATUREATRECEIPI VC..

Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators
MAXIMUM DATA POINTS = 58
REQUIRED DATA ENTRY
Table 1. Project Information
Facility Name
WWTP/WTP Class
NPDES Permit
OutFall
Flow, Qw (MGD)
Receiving Stream
HUC Number
Stream Class
❑ CHECK IF HQW OR ORW WQS
Pilot Mountain WWTP
II
NCO026646
001
0.500
Ararat River
03040101
C
❑ Apply WS Hardness WQC
7Q10s (cfs)
7Q10w (cfs)
30Q2 (cfs)
QA (cfs)
1Q10s (cfs)
82.20
163.00
67.19
_Effluent Hardness _ _ _ _
Upstream Hardness
Combined Hardness Chronic
Combined Hardness Acute
28.5 mg/L (Avg)
13.1 mg/L (Avg)
I — — — — — — — 25 mg/L —
I _ _ _ _ _25 mg/L
Data from DMRs; Hardness data provided by ORC
upon request.
Data Source(s)
❑ CHECK TO APPLY MODEL
Par01
Par02
Par03
Par04
Par05
ParOM
Par07
Par08
Par09
Par10
Par11
Par12
Par13
Par14
Par15
Par16
Par17
Par18
Par19
Par20
Par21
Par22
Par23
Par24
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
0.5899
FW
3.2396
ug/L
Chlorides
Aquatic Life
NC
230
FW
mg/L
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
117.7325
FW
905.0818
ug/L
Chromium VI
Aquatic Life
NC
11
FW
16
pg/L
Chromium, Total
Aquatic Life
NC
N/A
FW
N/A
pg/L
Copper
Aquatic Life
NC
7.8806
FW
10.4720
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
2.9416
FW
75.4871
ug/L
Mercury
Aquatic Life
NC
12
FW
0.5
ng/L
Molybdenum
Human Health
NC
2000
HH
ug/L
Nickel
Aquatic Life
NC
37.2313
FW
335.2087
pg/L
Nickel
Water Supply
NC
25.0000
WS
N/A
pg/L
Selenium
Aquatic Life
NC
5
FW
56
ug/L
Silver
Aquatic Life
NC
0.06
FW
0.2964
ug/L
Zinc
Aquatic Life
NC
126.7335
FW
125.7052
ug/L
26646 RPA 0.5 MGD, input
9/14/2020

26646 RPA 0.5 MGD, input
9/14/2020

Pilot Mountain WWTP
NCO026646
Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators
MAXIMUM DATA POINTS = 58
Qw (MGD)
= 0.5000
WWTP/WTP Class: II
1Q10S (cfs)
= 67.19
IWC% @ 1Q10S = 1.140292798
7Q10S (cfs)
= 82.20
IWC% @ 7Q10S = 0.93401627
7Q10W (cfs)
= 163.00
IWC% @ 7Q10W = 0.473210197
30Q2 (cfs)
= NO 3002 DATA
IWC% @ 30Q2 = N/A
Avg. Stream Flow, QA (cfs)
= NO QA DATA
IW°/aC @ QA = N/A
Receiving Stream: Ararat River HUC 03040101 Stream Class: C
Outfall 001
Qw = 0.5 MGD
COMBINED HARDNESS (ma/L)
Acute = 25 mg/L
Chronic = 25 mg/L
PARAMETER
NC STANDARDS OR EPA CRITERIA
REASONABLE POTENTIAL RESULTS
RECOMMENDED ACTION
TYPE
J
a
IL
H
Chronic Applied
Acute
ri # Det. Max Pred Cw Allowable Cw
Standard
Acute (FW): 29,816.9
Arsenic
C
150 FW(7Q10s) 340
ug/L
0 0
N/A
Chronic (FW): 16,059.7
Arsenic
C
10 HH/WS(Qavg)
ug/L
Chronic (F": IWC?
Acute: 5,700.29
Beryllium
NC
6.5 FW(7Q10s) 65
ug/L
0 0
N/A
-
--Chronic:
---------------------------
-----695.92
Acute: 284.103
Cadmium
NC
0.5899 FW(7Q10s) 3.2396
ug/L
0 0
N/A
_ _
--Chronic-----63.155 -
---------------------------
Acute: NO WQS
Chlorides
NC
230 FW(7Q10s)
mg/L
0 0
N/A
--Chronic---- 24,624.8
------
Acute: NO WQS
Chlorinated Phenolic Compounds
NC
1 A(30Q2)
ug/L
0 0
N/A
-c-----IWC?-
—Chro_ _ni_
---------------------------
Acute: NO WQS
Total Phenolic Compounds
NC
300 A(30Q2)
ug/L
0 0
N/A
---------------------------
Acute: 79,372.8
Chromium III
NC
117.7325 FW(7Q10s) 905.0818
µg/L
0 0
N/A
--Chronic---- 12,605.0
------
Acute: 1,403.1
Chromium VI
NC
11 FW(7Q10s) 16
µg/L
0 0
N/A
_ _ _
--Chronic--_ —1,177.7
------
Chromium, Total
NC
µg/L
0 0
N/A
Acute: 918.36
Copper
NC
7.8806 FW(7Q10s) 10.4720
ug/L
18 18
470.64
_ _ _ _ _ _ _
_ _ _ _ _ _ _ _ _ _ _ _ ___
_
Chronic 843.74
No RP ,Predicted Max t 50 % of Allowable Cw -
No value > Allowable Cw
apply Quarterly Monitoring
26646 RPA 0.5 MGD, rpa
Page 1 of 2 9/14/2020

Pilot Mountain WWTP
NCO026646 Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators
Outfall 001
Qw = 0.5 MGD
Acute: 1,929.3
Cyanide
NC
5 FW(7Q10s) 22
10
ug/L
0 0
N/A
_ _ _
Chronic 535.3
Acute: NO WQS
Fluoride
NC
1800 FW(7Q10s)
ug/L
0 0
N/A
_ _ _ _ _ _
Chronic 192,716.1
___
Acute: 6,619.976
Lead
NC
2.9416 FW(7Q10s) 75.4871
ug/L
0 0
N/A
—Chronic: 314.944
————————————
Acute: NO WQS
Mercury
NC
12 FW(7Q10s)
0.5
ng/L
0 0
N/A
----------------------
Acute: NO WQS
Molybdenum
NC
2000 HH(7Q10s)
ug/L
0 0
N/A
--Chronic----214,129.0
---------------------------
Acute (FW): 29,396.7
Nickel
NC
37.2313 FW(7Q10s) 335.2087
µg/L
0 0
N/A
Chronic (FW): 3,986.2
Nickel
NC
25.0000 WS(7Q10s)
µg/L
Chronic (WS): 2,676.6
Acute: 4,911.0
Selenium
NC
5 FW(7Q10s) 56
ug/L
0 0
N/A
--Chronic---- 535.3
------
Acute: 25.993
Silver
NC
0.06 FW(7Q10s) 0.2964
ug/L
0 0
N/A
--Chronic---- 6.424
------
Acute: 11,023.9
Zinc
NC
126.7335 FW(7Q10s) 125.7052
ug/L
18 18
270.6
_ _ _ _ _ _ _ _
Chronic 13,568.7
_ ___ _ _ _ _ _ _ _ _ _ —No—
No RP, Predicted Max < 50 % of Allowable Cw
No value > Allowable Cw
Monitoring required
Acute:
0 0
N/A
— — — —
Chronic
— — — — — — — — — — — —
Acute:
0 0
N/A
— —
Chronic
— — — — — — — — — —
Acute:
0 0
N/A
--Chronic------
----------------------
Acute:
0 0
N/A
--Chronic---------------------------------------
26646 RPA 0.5 MGD, rpa
Page 2 of 2 9/14/2020

FACILITY: Pilot Mountain WWTP Outfall 001
NPDES PERMIT: NCO026646
Dissolved to Total Metal Calculator
In accordance with Federal Regulations, permit limitations must be written as Total Metals per 40 CFR 122.45(c)
Receiving
Receiving
Rec. Stream
NPDES
Total Suspended
Combined
Combined
Instream
Instream
Upstream
Effluent
Stream
summer
Stream
summer 7Q10
1Q10
Flow Limit
Solids
-Fixed Value-
Hardness
chronic
Hardness
Acute
Wastewater
Concentration
Wastewater
Concentration
Hardness
Average (mg L)
Hardness
Average
7Q10 (CFS)
(MGD)
[MGD]
[MGD]
(mg/L)
(mg/L)
(mg/L)
(Chronic)
(Acute)
(mg/L)
82.2000
53.0323
43.3484
0.5000
10
25.000
25.000
0.9340
1.1403
13.1
28.5
PARAMETER
Dissolved Metals Criteria
after applying hardness
a nation
US EPA
Translators- using
Default Partition
Coefficients
streams
Total Metal Criteria Total Metal
Dissolved Metal+T Translator
Chronic
Acute
Chronic
Acute
u /I
u /I
u /
u /I
Cadmium (d)
0.15
0.82
0.252
0.59
3.24
Cd -Trout streams
0.15
0.51
0.252
0.59
2.01
Chromium III (d)(h)
24
1831
0.2021
117.73
905.08
Chromium VI (d)
1 11
161
1.0001
11.00
16.13C
Copper (d)(h)
2.7
3.61
0.348
7.881
10.47
Lead (d)(h)
0.54
14
0.184
2.94
75.49
Nickel (d)(h)
16
145
0.432
37.231
335.21
Ni - WS streams (t)
Silver d h,acute
0.06
0.30
1.000
0.061
0.3C
Zinc (d)(h)
36
36
0.288
126.73 125.71
1.000
Upstream Hard Avg (mg/L) = 13.1
EFF Hard Avg (mg/L) = 28.5
(identify parameters to PERCS Branch to maintain in facility's LTMP/STMP):
(d) = dissolved metal standard. See 15A NCAC 02B .0211 for more information.
(h) = hardness -dependent dissolved metal standard. See 15A NCAC 02B .0211 for more information.
(t) = based upon measurement of total recoveable metal. See 15A NCAC 02B .0211 for more information.
The Human Health standard for Nickel in Water Supply Streams is 25 mg/L which is Total Recoverable metal standard.
The Human Health standard for Arsenic is 10 µg/L which is Total Recoverable metal standard.

Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators
MAXIMUM DATA POINTS = 58
REQUIRED DATA ENTRY
Table 1. Project Information
Facility Name
WWTP/WTP Class
NPDES Permit
OutFall
Flow, Qw (MGD)
Receiving Stream
HUC Number
Stream Class
❑ CHECK IF HQW OR ORW WQS
Pilot Mountain WWTP
II
NCO026646
001
1.500
Ararat River
03040101
C
❑ Apply WS Hardness WQC
7Q10s (cfs)
7Q10w (cfs)
30Q2 (cfs)
QA (cfs)
1Q10s (cfs)
82.20
163.00
67.19
_Effluent Hardness _ _ _ _
Upstream Hardness
Combined Hardness Chronic
Combined Hardness Acute
28.5 mg/L (Avg)
13.1 mg/L (Avg)
I — — — — — — — 25 mg/L —
I _ _ _ _ _25 mg/L
Data from DMRs. Hardness data provided by ORC
upon request.
Data Source(s)
❑ CHECK TO APPLY MODEL
Par01
Par02
Par03
Par04
Par05
ParOM
Par07
Par08
Par09
Par10
Par11
Par12
Par13
Par14
Par15
Par16
Par17
Par18
Par19
Par20
Par21
Par22
Par23
Par24
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
0.5899
FW
3.2396
ug/L
Chlorides
Aquatic Life
NC
230
FW
mg/L
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
117.7325
FW
905.0818
ug/L
Chromium VI
Aquatic Life
NC
11
FW
16
pg/L
Chromium, Total
Aquatic Life
NC
N/A
FW
N/A
pg/L
Copper
Aquatic Life
NC
7.8806
FW
10.4720
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
2.9416
FW
75.4871
ug/L
Mercury
Aquatic Life
NC
12
FW
0.5
ng/L
Molybdenum
Human Health
NC
2000
HH
ug/L
Nickel
Aquatic Life
NC
37.2313
FW
335.2087
pg/L
Nickel
Water Supply
NC
25.0000
WS
N/A
pg/L
Selenium
Aquatic Life
NC
5
FW
56
ug/L
Silver
Aquatic Life
NC
0.06
FW
0.2964
ug/L
Zinc
Aquatic Life
NC
126.7335
FW
125.7052
ug/L
26646 RPA 1.5 MGD, input
9/14/2020

26646 RPA 1.5 MGD, input
9/14/2020

Pilot Mountain WWTP
NCO026646
Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators
MAXIMUM DATA POINTS = 58
Qw (MGD)
= 1.5000
WWTP/WTP Class: II
IQ10S (cfs)
= 67.19
IWC% @ 1Q10S = 3.344601884
7Q10S (cfs)
= 82.20
IWC% @ 7Q10S = 2.750665484
7Q10W (cfs)
= 163.00
IWC% @ 7Q10W = 1.406320883
30Q2 (cfs)
= NO 3002 DATA
IWC% @ 30Q2 = N/A
Avg. Stream Flow, QA (cfs)
= NO QA DATA
IW°/aC @ QA = N/A
Receiving Stream: Ararat River HUC 03040101 Stream Class: C
Outfall 001
Qw = 1.5 MGD
COMBINED HARDNESS (ma/L)
Acute = 25 mg/L
Chronic = 25 mg/L
PARAMETER
NC STANDARDS OR EPA CRITERIA
REASONABLE POTENTIAL RESULTS
RECOMMENDED ACTION
TYPE
J
a
IL
H
Chronic Applied
Acute
ri # Det. Max Pred Cw Allowable Cw
Standard
Acute (FW): 10,165.6
Arsenic
C
150 FW(7Q10s) 340
ug/L
0 0
N/A
__ _ _ _ _
Chronic (FW): 5,453.2
Arsenic
C
10 M4/WS(Qavg)
ug/L
Chronic (F": IWC?
Acute: 1,943.43
Beryllium
NC
6.5 FW(7Q10s) 65
ug/L
0 0
N/A
_ _ _
_
Chronic 236.31
Acute: 96.861
Cadmium
NC
0.5899 FW(7Q10s) 3.2396
ug/L
0 0
N/A
_ _ _ _
--Chronic---- 21.445 -
---------------------------
Acute: NO WQS
Chlorides
NC
230 FW(7Q10s)
mg/L
0 0
N/A
--Chronic---- 8,361.E
------
Acute: NO WQS
Chlorinated Phenolic Compounds
NC
1 A(30Q2)
ug/L
0 0
N/A
---------------------------
Acute: NO WQS
Total Phenolic Compounds
NC
300 A(30Q2)
ug/L
0 0
N/A
Chronic IWC?
Acute: 27,061.0
Chromium III
NC
117.7325 FW(7Q10s) 905.0818
µg/L
0 0
N/A
_ _ _
—Chronic-_ — _ 4,280.1
-------------------------
EL—
Acute: 478.4
Chromium VI
NC
11 FW(7Q10s) 16
µg/L
0 0
N/A
---------------------------
Chromium, Total
NC
µg/L
0 0
N/A
Acute: 313.10
Copper
NC
7.8806 FW(7Q10s) 10.4720
ug/L
18 18
470.64
_ _ _ _ _ _
_
Chronic 286.50
RP shown - apply Monthly Monitoring with Limit
2 values > Allowable Cw
26646 RPA 1.5 MGD, rpa
Page 1 of 2 9/14/2020

Pilot Mountain WWTP
NCO026646 Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators
Outfall 001
Qw = 1.5 MGD
Acute: 657.8
Cyanide
NC
5 FW(7Q10s) 22
10
ug/L
0 0
N/A
Chronic 181.8
Acute: NO WQS
Fluoride
NC
1800 FW(7Q10s)
ug/L
0 0
N/A
Chronic 65,438.7
Acute: 2,256.983
Lead
NC
2.9416 FW(7Q10s) 75.4871
ug/L
0 0
N/A
_
Chronic 106.942
Acute: NO WQS
Mercury
NC
12 FW(7Q10s)
0.5
ng/L
0 0
N/A
---------------------------
Acute: NO WQS
Molybdenum
NC
2000 HH(7Q10s)
ug/L
0 0
N/A
Chronic 72,709.7
Acute (FW): 10,022.4
Nickel
NC
37.2313 FW(7Q10s) 335.2087
µg/L
0 0
N/A
_ _ _ _ _ _ _
Chronic (FW): 1,353.5
_____
Nickel
NC
25.0000 WS(7Q10s)
µg/L
Chronic (WS): 908.9
Acute: 1,674.3
Selenium
NC
5 FW(7Q10s) 56
ug/L
0 0
N/A
--Chronic---- 181.8
------
Acute: 8.862
Silver
NC
0.06 FW(7Q10s) 0.2964
ug/L
0 0
N/A
--Chronic---- 2.181
------------------
Acute: 3,758.5
Zinc
NC
126.7335 FW(7Q10s) 125.7052
ug/L
18 18
270.6
_ _ _ _____ _ _
Chronic 4,607.4
_ ___ _ _ _ _ _ _ _ _ _ _ _
No RP, Predicted Max < 50 % of Allowable Cw No
No value > Allowable Cw
Monitoring required
Acute:
0 0
N/A
— — — —
Chronic
— — — — — — — — — — — —
Acute:
0 0
N/A
— —
Chronic
— — — — — — — — — —
Acute:
0 0
N/A
--Chronic------
----------------------
Acute:
0 0
N/A
--Chronic---------------------------------------
26646 RPA 1.5 MGD, rpa
Page 2 of 2 9/14/2020

FACILITY: Pilot Mountain WWTP Outfall 001
NPDES PERMIT: NCO026646
Dissolved to Total Metal Calculator
In accordance with Federal Regulations, permit limitations must be written as Total Metals per 40 CFR 122.45(c)
Receiving
Stream
Receiving
Stream
Rec. Stream
NPDES
Total Suspended
Solids
Combined
Hardness
Combined
Hardness
Instream Instream Effluent
Upstream
Wastewater Wastewater Hardness
summer
summer 7Q10
1Q10
Flow Limit
-Fixed Value-
chronic
Acute
Hardness
Concentration Concentration Average
Average (mg L)
7Q10 (CFS)
(MGD)
[MGD]
[MGD]
(mg/L)
(mg/L)
(mg/L)
(Chronic) (Acute) (mg/L)
82.2000
53.0323
43.3484
1.5000
10
25.000
25.000
2.7507 3.3446 13.1 28.5
PARAMETER
Dissolved Metals Criteria
after applying hardness
a nation
US EPA
Translators- using
Default Partition
Coefficients
streams
Total Metal Criteria Total Metal
Dissolved Metal+Translator
Chronic
Acute
Chronic
Acute
u /I
u /I
u /
u /I
Cadmium (d)
0.15
0.82
0.252
0.59
3.24
Cd -Trout streams
0.15
0.51
0.252
0.59
2.01
Chromium III (d)(h)
24
1831
0.2021
117.73
905.08
Chromium VI (d)
1 11
161
1.0001
11.00
16.13C
Copper (d)(h)
2.7
3.61
0.348
7.881
10.47
Lead (d)(h)
0.54
14
0.184
2.94
75.49
Nickel (d)(h)
16
145
0.432
37.231
335.21
Ni - WS streams (t)
Silver d h,acute
0.06
0.30
1.000
0.061
0.3C
Zinc (d)(h)
36
36
0.288
126.73 125.71
1.000
Upstream Hard Avg (mg/L) = 13.1
EFF Hard Avg (mg/L) = 28.5
(identify parameters to PERCS Branch to maintain in facility's LTMP/STMP):
(d) = dissolved metal standard. See 15A NCAC 02B .0211 for more information.
(h) = hardness -dependent dissolved metal standard. See 15A NCAC 02B .0211 for more information.
(t) = based upon measurement of total recoveable metal. See 15A NCAC 02B .0211 for more information.
The Human Health standard for Nickel in Water Supply Streams is 25 mg/L which is Total Recoverable metal standard.
The Human Health standard for Arsenic is 10 µg/L which is Total Recoverable metal standard.

H1
1
2
3
4
5
6
7
8
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
REASONABLE POTENTIAL ANALYSIS
Use "PASTE SPECIAL H2 Use "PASTE SPECIAL
Effluent Hardness Values" then "COPY". Upstream Hardness Values" then "COPY"
Maximum data points Maximum data points
= 58 = 58 i
Date
Data
BDL=1/2DL
Results
Date
Data
BDL=1/2DL
Results
5/4/2020
28.1
28.1
Std Dev.
0.5477
1
5/4/2020
14.6
14.6
Std Dev.
1.2062
5/5/2020
28.1
28.1
Mean
28.5000
2
5/5/2020
11.4
11.4
Mean
13.1000
5/6/2020
29.1
29.1
C.V. (default)
0.6000
3
5/6/2020
12.5
12.5
C.V. (default)
0.6000
5/7/2020
28.1
28.1
n
5
4
5/7/2020
13.5
13.5
n
5
5/8/2020
29.1
29.1
10th Per value
28.10 mg/L
5
5/8/2020
13.5
13.5
10th Per value
11.84 mg/L
Average Value
28.50 mg/L
6
Average Value
13.10 mg/L
Max. Value
29.10 mg/L
7
Max. Value
14.60 mg/L
8
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
26646 RPA 1.5 MGD, data
1 9/14/2020

REASONABLE POTENTIAL ANALYSIS
Par01 $ Par02
Arsenic
Date Data
BDL=1/2DL Results
1
Std Dev.
2
Mean
3
C.V.
4
n
5
6
Mult Factor =
7
Max. Value
8
Max. Pred Cw
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use "PASTE SPECIAL Par03
Values" then "COPY".
Maximum data points
= 58
NO DATA
NO DATA
0
N/A
N/A ug/L
N/A ug/L
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use "PASTE SPECIAL
Beryllium
Values" then "COPY"
Maximum data points
= 58
Date Data BDL=1/2DL Results
Std Dev.
0 DATA
Mean
NO DATA
C.V.
NO DATA
n
0
Mult Factor =
N/A
Max. Value
N/A ug/L
Max. Pred Cw
N/A ug/L
-2-
26646 RPA 1.5 MGD, data
9/14/2020

REASONABLE POTENTIAL ANALYSIS
Par04
Cadmium
Date Data
BDL=1/2DL Results
1
Std Dev.
2
Mean
3
C.V.
4
n
5
6
Mult Factor =
7
Max. Value
8
Max. Pred Cw
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use "PASTE SPECIAL Par05
Values" then "COPY".
Maximum data points
= 58
NO DATA
NO DATA
0
N/A
N/A ug/L
N/A ug/L
1
2
3
4
5
6
7
8
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
Chlorides
Date Data BDL=1/2DL Results
Std Dev.
Mean
C.V.
n
Mult Factor =
Max. Value
Max. Pred Cw
Use 'PASTE SPECIAL -
Values" then "COPY".
Maximum data points =
58
NO DATA
NO DATA
0
N/A
N/A mg/L
N/A mg/L
-3-
26646 RPA 1.5 MGD, data
9/14/2020

REASONABLE POTENTIAL ANALYSIS
Par06
Chlorinated Phenolic Compounds
Use"PASTE SPECIAL
Values"then .COPY...
Par07
Maximum data points
= 58
Date Data BDL=1/2DL Results
1
Std Dev.
NO DATA
1
2
Mean
NO DATA
2
3
C.V.
NO DATA
3
4
n
0
4
5
5
6
Mult Factor =
N/A
6
7
Max. Value
N/A ug/L
7
8
Max. Fred Cw
N/A ug/L
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
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
Use "PASTE SPECIAL
Total Phenolic Compounds
ValuesMaximum uCOPYt
m data points
= 58
Date Data BDL=1/2DL Results
Std Dev.
NJO DATA
Mean
NO DATA
C.V.
NO DATA
n
0
Mult Factor =
N/A
Max. Value
N/A ug/L
Max. Fred Cw
N/A ug/L
26646 RPA 1.5 MGD, data
-4- 9/14/2020

REASONABLE POTENTIAL ANALYSIS
Par08
Par09
Use "PASTE SPECIAL
Use "PASTE SPECIAL
Chromium III
Values" then "COPY".
Chromium VI
Values" then "COPY"
Maximum data points
Maximum data points
= 58
--58
Date
Data BDL=1/2DL Results
Date
Data BDL=1/2DL Results
1
Std Dev.
1
Std Dev.
DA
2
Mean
NO DATA
2
Mean
NO DATA
3
C.V.
NO DATA
3
C.V.
NO DATA
4
n
0
4
n
0
5
5
6
Mult Factor =
N/A
6
Mult Factor =
N/A
7
Max. Value
N/A Ng/L
7
Max. Value
N/A Ng/L
8
Max. Pred Cw
N/A Ng/L
8
Max. Pred Cw
N/A Ng/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
26646 RPA 1.5 MGD, data
-5- 9/14/2020

REASONABLE POTENTIAL ANALYSIS
Par10
Pall
Use "PASTE SPECIAL
Use "PASTE SPECIAL
Chromium, Total
Values" then "COPY".
Copper
Values" then "COPY"
Maximum data points
Maximum data points
= 58
= 58
Date
Data BDL=1/2DL Results
Date
Data
BDL=1/2DL
Results
1
Std Dev.
1
4/12/2016
117
117
Std Dev.
2
2
Mean
NO DATA
2
7/12/2016
18
18
Mean
128.7222
3
C.V.
NO DATA
3
10/11/2016
318
318
C.V.
0.6931
4
n
0
4
1/10/2017
20
20
n
18
5
5
4/11/2017
146
146
6
Mult Factor =
N/A
6
7/11/2017
128
128
Mult Factor =
1.48
7
Max. Value
N/A Ng/L
7
10/3/2017
121
121
Max. Value
318.00 ug/L
8
Max. Pred Cw
N/A Ng/L
8
1/9/2018
95
95
Max. Pred Cw
470.64 ug/L
9
9
4/10/2018
122
122
10
10
7/10/2018
89
89
11
11
10/9/2018
186
186
12
12
11 /6/2018
207
207
13
13
1/15/2019
144
144
14
14
4/9/2019
181
181
15
15
7/9/2019
87
87
16
16
10/8/2019
308
308
17
17
1/14/2020
12
12
18
18
5/5/2020
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
26646 RPA 1.5 MGD, data
-6- 9/14/2020

REASONABLE POTENTIAL ANALYSIS
Par12
Cyanide
Date Data
BDL=1/2DL Results
1
Std Dev.
2
Mean
3
C.V.
4
n
5
6
Mult Factor =
7
Max. Value
8
Max. Pred Cw
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use "PASTE SPECIAL Par13
Values" then "COPY".
Maximum data points
= 58
NO DATA
NO DATA
0
N/A
N/A ug/L
N/A ug/L
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use "PASTE SPECIAL
Fluoride
Values" then "COPY"
Maximum data points
= 58
Date Data BDL=1/2DL Results
Std Dev.
0 DATA
Mean
NO DATA
C.V.
NO DATA
n
0
Mult Factor =
N/A
Max. Value
N/A ug/L
Max. Pred Cw
N/A ug/L
-7-
26646 RPA 1.5 MGD, data
9/14/2020

REASONABLE POTENTIAL ANALYSIS
Par14
Lead
Date
BDL=1/2DL Results
1
Std Dev.
2
Mean
3
C.V.
4
n
5
6
Mult Factor =
7
Max. Value
8
Max. Pred Cw
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use "PASTE SPECIAL Par15
Values" then "COPY".
Maximum data points
= 58
NO DATA
NO DATA
0
N/A
N/A ug/L
N/A ug/L
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use "PASTE SPECIAL
Mercury
Values" then "COPY"
Maximum data points
= 58
Date Data BDL=1/2DL Results
Std Dev.
0 DATA
Mean
NO DATA
C.V.
NO DATA
n
0
Mult Factor =
N/A
Max. Value
N/A ng/L
Max. Pred Cw
N/A ng/L
-8-
26646 RPA 1.5 MGD, data
9/14/2020

REASONABLE POTENTIAL ANALYSIS
Par16
Molybdenum
Date Data BDL=1/2DL Results
1 Std Dev.
2 Mean
3 C.V.
4 n
5
6 Mult Factor =
7 Max. Value
8 Max. Fred Cw
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use "PASTE SPECIAL Par17 & Par18
Values" then "COPY" .
Maximum data points
= 58
Date Data
NO DATA
NO DATA
0
N/A
N/A ug/L
N/A ug/L
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use 'PASTE SPECIAL
Nickel
Values" then "COPY" .
Maximum data points
= 58
BDL=1/2DL Results
Std Dev.
NO DATA
Mean
NO DATA
C.V.
NO DATA
n
0
Mult Factor =
N/A
Max. Value
N/A Ng/L
Max. Fred Cw
N/A Ng/L
-9-
26646 RPA 1.5 MGD, data
9/14/2020

REASONABLE POTENTIAL ANALYSIS
Par19
Selenium
Date Data
BDL=1/2DL Results
1
Std Dev.
2
Mean
3
C.V.
4
n
5
6
Mult Factor =
7
Max. Value
8
Max. Fred Cw
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use "PASTE SPECIAL Par20
Values" then "COPY" .
Maximum data points
= 58
NU -DATA 1
NO DATA 2
NO DATA 3
0 4
5
N/A 6
N/A ug/L 7
N/A ug/L 8
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
Silver
Date Data BDL=1/2DL Results
Std Dev.
Mean
C.V.
n
Mult Factor =
Max. Value
Max. Fred Cw
Use "PASTE SPECIAL Par2
Values" then "COPY".
Maximum data points
= 58
N DATA 1
NO DATA 2
NO DATA 3
0 4
5
N/A 6
N/A ug/L 7
N/A ug/L 8
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
26646 RPA 1.5 MGD, data
- 10 - 9/14/2020

REASONABLE POTENTIAL ANALYSIS
1
Zinc
Date
Data
BDL=1/2DL
Results
4/12/2016
85
85
Std Dev.
7/12/2016
47
47
Mean
10/11/2016
178
178
C.V.
1/10/2017
28
28
n
4/11/2017
37
37
7/11/2017
10
10
Mult Factor =
10/3/2017
23
23
Max. Value
1/9/2018
42
42
Max. Pred Cw
4/10/2018
14
14
7/10/2018
44
44
10/9/2018
68
68
11/6/2018
41
41
1/15/2019
113
113
4/9/2019
84
84
7/9/2019
37
37
10/8/2019
76
76
1/14/2020
22
22
5/5/2020
37
37
Use "PASTE SPECIAL
Par22
Values" then "COPY".
Maximum data points
= 58
Date Data
41.2404
1
54.7778
2
0.7529
3
18
4
5
1.52
6
178.0 ug/L
7
270.6 ug/L
8
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
0
BDL=1/2DL Results
Std Dev.
Mean
C.V.
n
Mult Factor =
Max. Value
Max. Pred Cw
Use "PASTE SPECIAL
Values" then "COPY".
Maximum data points
= 58
NO DATA
NO DATA
NO DATA
0
N/A
N/A
N/A
26646 RPA 1.5 MGD, data
11 - 9/14/2020

Permit No. NCO026646
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/l
(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] (0.04183 8)) • e^{0.9151 [ln hardness]-3.1485}
Cadmium, Acute Trout waters
WER*{1.136672-[ln hardness] (0.04183 8)) • e^{0.915l[ln hardness] -3.6236}
Cadmium, Chronic
WER*{1.101672-[ln hardness] (0.04183 8)) • 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)} • 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. NCO026646
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[1n 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.
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. NCO026646
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 1Q10 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 — I
Ctotal 1 + { [KPO] [SS(l+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:
1Q10 = used in the equation to protect aquatic life from acute toxicity
Page 3 of 4

Permit No. NC0026646
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.
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
28.5
Data provided by Permittee
(Total as CaCO3)
Average Upstream Hardness, mg/L
13.1
Data provided by Permittee
(Total as CaCO3)
7Q10 summer (cfs)
82.2
Reported in previous permit Fact
Sheet
1 Q 10 (cfs)
67.19
Calculated in RPA spreadsheet
Permitted Flow (MGD)
0.511.5
Operating /Design flow
Date: September 14, 2020
Permit Writer: Gary Perlmutter
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