NC0026441_Fact Sheet_20220323

Fact Sheet
NPDES Permit No. NC0026441
Permit Writer/Email Contact: Gary Perlmutter, [e-mail]
Date: March 22, 2022
Division/Branch: NC Division of Water Resources/NPDES Municipal Permitting
Fact Sheet Template: Version 09Jan2022
Permitting Action:
❑ Renewal
® Renewal with Expansion
❑ New Discharge
❑ Modification (Fact Sheet should be tailored to mod request)
Note: A complete application should include the following:
• For New Dischargers, EPA Form 2A or 2D requirements, Engineering Alternatives Analysis, Fee
• For Existing Dischargers (POTW), EPA Form 2A, 3 effluent pollutant scans, 4 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
NIIII
Facility Information
Applicant/Facility Name:
Town of Siler City / Siler City WWTP
Applicant Address:
P.O. Box 769, Siler City, NC 27344
Facility Address:
198 Utility Drive, Siler City, NC 27344
Permitted Flow:
4.0 MGD (current), 6.0 MGD (proposed)
Facility Type/Waste:
MAJOR Municipal: 68 % Domestic, 32 % Industrial'
Facility Class:
Grade IV
Treatment Units:
.0 MGD; Bar screen, Grit collection, Influent equalization basins,
Oxidation ditches with aeration, Secondary clarifiers, Tertiary filters,
Aerobic digesters, Lime stabilization, Sludge thickening, Chlorination,
De -chlorination, Step -aeration.
Pretreatment Program (Y/N)
Yes
County:
Chatham
Region
Raleigh
Footnote.
1. Permitted industrial flow is 1.28 MGD.
Briefly describe the proposed permitting action and facility background: The Town of Siler City had
applied for NPDES permit renewal and submitted a renewal application dated November 30, 2018 to DWR,
Page 1 of 24

received that day. In 2019, the Division reopened and modified the permit in response to the facility
accepting industrial wastewater from Mountaire Farms Poultry Processing Plant that increased nutrient
input. The permit modification added a Total Nitrogen (TN) load limit of 73,058 lb/yr, to become effective
no later than January 1, 2023; and an interim TN load limit of 667 lb/day (243,455 lb/yr), effective from
January 1, 2020 through December 31, 2022. The modified permit became effective May 1, 2019, expiring
May 30, 2019. The permit is currently administratively extended.
The modified permit was contested by the Permittee and Rocky River Watch, both on May 30, 2019. The
petitions to contest the permit were consolidated and, and a settlement agreement among the parties and the
Division was signed on June 5, 2020. Conditions in the settlement agreement pertinent to the permit include
submission of a permit application to the Division for revised TN limits as specified in the agreement and
a 6.0 MGD expansion tier (provided all other procedural information is received, e.g., EAA for 6.0 MGD).
The permit renewal with expansion is to include a revised TN load limit, increased effluent TN monitoring
(both load and concentration), and changes to instream monitoring requirements. The permit application
submittal deadline in the agreement was December 31, 2020 so long as the environmental review was
complete. The Town had requested a deadline extension to April 30, 2021 to allow more time for the
environmental review.
The Permittee submitted a preliminary engineering report in February 2021, which includes the required
EAA for design flow expansion, to meet compliance with the "80/90 rule" (15A NCAC 02T .0118) as the
2019 average flow was 2.95 MGD or 74% of the 4.0 MGD design flow. The original document detailed
the preferred alternative as a two-phase upgrade and expansion. The first phase aims to improve nutrient
removal while maintaining 4.0 MGD flow capacity. The second phase includes expansion to 6.0 MGD with
an additional treatment train. Proposed system components of the 6.0 MGD expansion include:
• Upgraded headworks (influent screens & grit removal)
• Upgraded influent pump station
• Upgraded splitter box
• One additional oxidation ditch
• One return pump station
• One additional 90 ft diameter clarifier
• Denitrification filters
• UV disinfection
• Post aeration
• Upgraded discharge pipe
• Belt filter press
The revised permit application (for the 6.0 MGD expansion) was received on April 30, 2021; its review
found the application complete with a completed and signed Form 2A and attachments, and a preliminary
engineering report including an EAA for system improvements and expansion to 6 MGD. The three
Effluent Pollutant Scans were sampled in 3/20/2018, 9/10/2019 and 6/9/2020; the four second species
toxicity tests were sampled in 3/20/2017, 6/12/2017, 9/11/2017 and 12/11/2017.
The EAA portion of the original Preliminary Engineering Report was reviewed and found incomplete;
which included an incomplete accounting of protected species, incomplete evaluation of alternatives
(including incomplete economic feasibility evaluations) and an outdated estimate project schedule. A
revised Engineering Report was received on 8/18/2021 and was found complete upon review. Due to
unforeseen delays, a revised schedule for the expansion was submitted and approved on March 15, 2022.
This schedule consolidated the project into a single phase of construction due to both timing issues and
concerns over operation of the treatment facility while under construction. The Division issued speculative
limits for the 6.0 MGD expansion on 9/20/2021. This facility serves a population of —8225 residents in the
Town of Siler City and operates a pretreatment program with 2 Significant Industrial Users (SIUs). The
industrial sources are Mountaire Farms (poultry processing) and Brookfield Farms (poultry, pork and beef
processing).
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A 6.0 MGD expansion flow tier will be added to the permit, along with a second list of system components
on the Supplement to Permit Cover Sheet for the expansion.
2. Receiving Waterbody Information
Receiving Waterbody Information
Outfalls/Receiving Stream(s):
Outfall 001 - Loves Creek
Stream Segment:
17-43-1Oc
Stream Classification:
C
Drainage Area (mi2):
41le 8.19
Summer 7Q10 (cfs)
0.0
Winter 7Q10 (cfs):
0.23
30Q2 (cfs):
0.32
Average Flow (cfs):
7.8
IWC (% effluent):
90 at 4.0 and 6.0
303(d) listed/parameter:
Benthos (Nar, AL, FW)
Subject to TMDL/parameter:
Statewide TMDL for Mercury
Subbasin/HUC:
03-06-12 / 03030003
USGS Topo Quad:
E21NW / Siler City, NC
Updated stream flow information was received from USGS on July 28, 2021 per request. The receiving
stream is listed impaired for Benthos in the NC 2020 final 303(d) list. The Benthos impairment listing is
based on a Fair bioclassification from a sampling in 2003.
3. Effluent Data Summary
I
Effluent data is summarized in Table 1 for the period of Fedbruary 2018 through January 2022.
Table 1. Effluent Data Summary.
Parameter
Units
Average
Max
Min
Limit 1
Flow
MGD
2.79
10.89
0.86
4.0
Total Monthly Flow
(effective 5/1/2019)
MG/mo
89.39
130.16
68.30
BOD5
(April 1- October 31)
mg/L
4.2
31.0
< 2.0
MA = 5.0
WA = 7.5
BOD5
(November 1 - March 31)
mg/L
5.7
76.9
< 2.0
MA = 10.0
WA = 15.0
BOD5 removal
%
97.5
99.5
41.3
> 85
Page 3 of 24

Parameter
Units
Average
Max
Min
Limit'
Total Suspended Solids
(TSS)
mg/L
3.7
206
1.7
MA = 30.0
WA = 45.0
TSS removal
%
96.3
99.8
-281
> 85
Ammonia-N (NH3-N)
mg/L
1.7
27.0
< 0.5
MA = 1.0
WA = 3.0
(April 1 - October 31)
Ammonia-N (NH3-N)
(November 1 - March 31)
mg/L
3.1
34.0
< 0.5
MA = 2.0
WA = 6.0
Fecal Coliform
(geometric mean)
#/100 mL
10.7
> 80000
< 1.0
MA = 200
WA = 400
Total Residual Chlorine
(TRC)
µg/L
All values < 10
DM = 17 2
Temperature
°C
21
' 31
0
Dissolved Oxygen (DO)
mg/L
12.0
DA > 6.0
pH
SU
7.4
8.1
6.7
6.0-9.0
NO3-N + NO2-N
mg/L
8.1
33.0 p
< 0.2
TKN
mg/L
3.4
25.4
< 0.2
1
Total Nitrogen (TN)
mg/L
11.4
39.0
1.1
TN Load
lb/mo
_
22,264 ,521
TN Load
lb/yr
9,419
CY2020 = 90,571
CY2021 = 75,749
Interim = 243,455 3
Total Phosphorus (TP)
(April 1 - October 31)
mg/L
0.17
1.30
< 0.04
QA = 0.5
Total Phosphorus (TP)
(November 1 - March 31)
mg/L
019
1.90
< 0.02
QA = 2.0
Total Cadmium
µg/L
3.0
< 2.0
Total Copper
µg/L
7.8
16
4
Total Zinc
µg/L
19.7
31
< 10
Chloride
mg/L
109
212
28.3
Footnotes.
1. MA = Monthly Average; WA = Weekly Average; DM = Daily Maximum; DA = Daily Average; QA =
Quarterly Average.
2. TRC compliance level of 50 µg/L approved by EPA effective March 1, 2008 to address analytical
difficulties with TRC measurements.
3. Interim TN Load limit effective January 1, 2020-December 31, 2022. The final limit and its effective date
have been modified since the current permit based on the 2020 Settlement Agreement; see discussion under
"Other TMDL/Nutrient Management Strategy Considerations" in Section 6. below.
Average monthly flow has increased from 1.72 MGD in February 2018 to 3.03 MGD in January 2022. The
annual average flow for calendar year 2020 was 3.212 MGD or 80.3% of the design flow of 4.0 MGD, over
the 80% threshold at which the Permittee must submit an evaluation of future wastewater treatment which
may include a proposal for facility expansion (15A NCAC 02T .0118, or "80/90 rule"). As a result, the
Page 4 of 24

Permittee was imposed a sewer line moratorium on May 19, 2021. After review of the preliminary
engineering report, dated February 17, 2021, containing engineering alternatives analysis and selection of
the alternative that includes upgrading the facility to 6.0 MGD, it was deemed in compliance with the 80/90
rule and the moratorium was retracted on July 1, 2021.
From March 2021 through January 2022, the plant experienced several exceedences in multiple parameters,
including BOD, NH3, TSS and Fecal Coliform. From the DMR comments, plant operations had
experienced multiple issues contributing to the high values, including high flow events, high sludge
retention in the plant due to an inability to land apply due to the wet weather, and a potentially high carbon
load interfering with the treatment process. Further high rainfall events in February 2021 caused high
concentrations in several parameters, including flow, BOD, NH3, Fecal Coliform and TN. Most recently,
multiple exceedences have occurred in January 2021 due to equipment failure and resultant maintenance.
The proposed expansion to 6 MGD will include significant improvement to nutrient treatment.
4. Instream Data Summary
Instream monitoring may be required in certain situations, for example: 1) to verify model predictions when
model results for instream DO are within 1 mg/L of instream standard at full permitted flow; 2) to verify
model predictions for outfall diffuser; 3) to provide data for future TMDL; 4) based on other instream
concerns. Instream monitoring may be conducted by the Permittee, and there are also Monitoring Coalitions
established in several basins that conduct instream sampling for the Permittee (in which case instream
monitoring is waived in the permit as long as coalition membership is maintained).
If applicable, summarize any instream data and what instream monitoring will be proposed for this permit
action: The current permit requires instream monitoring for Dissolved Oxygen (DO), Temperature, Total
Phosphorus, TKN and NO2-N + NO3-N. Four instream monitoring locations are in the permit:
• LCU — Loves Creek, upstream of the discharge;
• LCD — Loves Creek, downstream of the discharge and above the confluence with the Rocky River;
• RRU — Rocky River, upstream of the confluence with Loves Creek; and
• RRD — Rocky River, downstream of the confluence with Loves Creek.
The Permittee is a member of the Upper Cape Fear River Basin Association (UCFRBA), and data are
available from the corresponding UCFRBA stations:
• B5890000 — Loves Creek at Wastewater Treatment Plant Rd, —450 ft upstream of discharge;
• B5920000 — Loves Creek at Progress Blvd, —1200 ft downstream of discharge;
• B5950000 — Rocky River at US 64 NR, —985 ft upstream of confluence with Loves Creek; and
• B5980000 — Rocky River at SR 2170 Rives Chapel Rd near Siler City, —22,450 ft or 4.25 miles
downstream of confluence with Loves Creek.
Instream data were obtained from DWR Ecosystems Branch / Monitoring Coalition Program for review. A
data summary is provided in Tables 2 and 3. Patterns of the above prameters plus Fecal Coliform,
Conductivity, and Ammonia -Nitrogen (NH3-N) are discussed below.
Page 5 of 24

Table 2. Summary of UCFRBA Data from January 2017-December 2020 - Loves Creek.
Parameter
Upstream - B5890000
Downstream - B5920000
Average
Max
Min
average
Max
Min
DO (mg/L)
8.4
11.9
5.1
8.7
13.3
5.4
Temperature (°C)
18.0
26.8
3.3
20.5
29.5
5.9
TP (mg/L)
0.049
0.158
0.020
0.051
0.219
0.020
TKN (mg/L)
0.69
2.45
0.20
1.13
8.13
0.15
NO2-N + NO3-N (mg/L)
0.48
1.24
0.06
.20
25.4
0.34
NH3-N (mg/L)
0.04
0.21
< 0.02
0.48
7.52
< 0.02
Fecal Coliform (geomean)
(cfu/100 mL)
226
12,200
5
127
8400
14
Specific Conductance (µS/cm)
192
1044
78
633
1210
100
Table 3. Summary of UCFRBA Data from January 2017-December 2020 - Rocky River.
Parameter
Upstream - B5950000
Downstream - B5980000
Average
Max
Min
Average
Max
Min
DO (mg/L)
7.7
11.8
3.2
7.8
12.6
5.0
Temperature (°C)
19.9
30.8
4.9
19.2
29.7
4.4
TP (mg/L)
0.101
0.296
0.020
0.095
0.311
0.020
TKN (mg/L)
1.05
3.15
0.20
1.16
2.51
0.53
NO2-N + NO3-N (mg/L)
0.32
1.07
0.02
2.16
8.15
0.15
NH3-N (mg/L) IN
0.04
0.22
40.02
0.05
0.51
< 0.02
Fecal Coliform (geomean)
(cfu/100 mL)
113
12,600
6
195
9800
30
Specific Conductance (1.6/14..
88
124
53
243
913
75
Dissolved Oxygen (DO) remains in the permit as a parameter of concern for aquatic life. The receiving
stream is meeting the 4 mg/L instantaneous DO standard, but the Rocky River segment that Loves Creek
flows into is impaired due to DO in the 2020 Integrated Report. Review of instream DO data from
November 2017-December 2020 indicated that the stream daily average DO standard of 5.0 mg/L (15A
NCAC 02B .0211) was maintained in the Loves Creek stations, but summer minima dipped below the
standard at the upstream Rocky River stations and reached to the standard at the downstream Rocky River
station. Concurrent effluent DO values were narrower in range with higher summer minima (average = 8.41
mg/L; range: 7.0-12.0 mg/L). Averages of the four instream stations plus concurrent effluent were found
to differ statistically (ANOVA; F = 2.5; p < 0.05). However, no statistically significant differences were
detected between the upstream and downstream location in Loves Creek (t- test: t = -0.93; p > 0.05).
Therefore, the effluent does not appear to affect the instream DO. The current instream DO monitoring will
be maintained in the permit.
Temperature remains in the permit as a parameter of concern for aquatic life. The receiving stream is
meeting the 32°C Temperature standard in the 2020 Integrated Report. Review of instream temperature
data from November 2017-December 2020 indicated that the stream Temperature standard of 32°C for
Page 6 of 24

lower piedmont and coastal plain waters (15A NCAC 02B .0211) was maintained at all stations. Concurrent
effluent Temperature values from November 2017—December 2020 were narrower in range with higher
winter minima (average = 22.0°C; range: 11.0-30.0°C). Averages of the four instream stations plus
concurrent effluent were not found to differ statistically (ANOVA; F = 2.4; p > 0.05). However, differences
between concurrent up- and downstream temperatures in Loves Creek averaged at a 2.4°C increase
downstream with 15 out of 49 differences > 2.8°C increase standard (15A NCAC 02B .0211). Differences
between concurrent up- and downstream temperatures in the Rocky River averaged at a 0.7°C decrease
downstream with only 1 difference > 2.8°C increase standard. The effluent appears to increase the instream
temperature in Loves Creek, but not Rocky River. The current instream Temperature monitoring will be
maintained in the permit.
Conductivity is a parameter of concern because of industrial discharges. The permit does not currently
require instream monitoring, but data are available for the monitoring stations noted above. Review of
instream data from November 2017—December 2020 found statistically significant average increases at
both downstream stations when compared to their respective upstream stations (paired two -sample t-test;
Loves Cr.: t = -9.49; p < 0001; Rocky R.: t = -6.11; p < 0001). The current permit does not require effluent
conductivity sampling; however, the WWTP has a pretreatment program with two SIUs. Despite the
absence of effluent data, the instream patterns suggest that the effluent is affecting the instream conductivity
both in Loves Creek and downstream in Rocky River. Based on this information, instream monitoring for
Conductivity will be added to the permit at a frequency of at least 2/month from May to September, and at
least 1/month from October until April. In addition, effluent monitoring for Conductivity will be added to
the permit at a daily frequency per 15A NCAC 2B .0500.
Fecal Coliform is a parameter of concern for aquatic life and human health. The permit does not currently
require instream monitoring for Fecal Coliform; the receiving stream is neither impaired for coliform nor
is it a Class B waterbody. However, data are available for review. Instream coliform counts were similar
among the four instream locations (Tables 2 and 3), all substantially greater than concurrent effluent
coliform counts, which include a geomean of 7 cfu/100 mL and a range of 1-308 cfu/100 mL. The effluent
does not appear to affect instream Fecal Coliform. However, based on the 2020 Settlement Agreement
recommendations, instream monitoring for Fecal Coliform will be added to the permit at a frequency of at
least 1/month.
Nutrients (Nitrogen and Phosphorus). Excess nutrients in waterbodies can lead to harmful algal blooms,
which have been documented with elevated Chlorophyll -a and nutrient (TN and TP) concentrations in
Loves Creek and Rocky River since prior to 1990. The Rocky River Nutrient Budget report in 1991
concluded that while nonpoint sources contributed > 80% of the nutrient input to the subbasin, point sources
were important during low flow periods, and Siler City WWTP was identified as the largest point source
contributor of nutruents. The report recommended limiting TP in the Siler City NPDES permit as the best
means to control instream algal growth. Along with TP effluent limits, instream monitoring for TP was
added to the permit in 1996, and TN components Total Kjeldahl Nitrogen (TKN) and Nitrate -Nitrite
(NO2+NO3) were added in 2014.
Review of instream nutrient data (TKN, NO2+NO3, NH3-N and TP) found downstream average NO2+NO3
to be higher with strong statistical significance in both Loves Creek (t-test; t = -7.72 p < 0.0001) and Rocky
River (t-test; t = -5.74; p < 0.0001), but no statistically significant differences were found involving the
remaining nutrient parameters. When tested with concurrent effluent data, significant differences were
found for all parameters, indicating higher effluent concentrations of TKN (ANOVA: F = 6.29; p < 0.0001),
NO2+NO3 (ANOVA: F = 55.36; p < 0.0001), NH3-N (ANOVA: F = 4.77; p < 0.005), and TP (ANOVA: F
= 3.01; p < 0.05). Among nutrient parameters, effluent was found to affect only the instream NO2+NO3
water quality in Loves Creek and in Rocky River. The current instream TP, TKN and NO2+NO3 monitoring
will be maintained in the permit, and instream NH3-N monitoring will be added to the permit, all at a
frequency of at least 1/month.
Page 7 of 24

Permit -required instream monitoring will continue to be waived as long as the Permittee maintains
membership in the Upper Cape Fear Basin Association (monitoring coalition).
Is this facility a member of a Monitoring Coalition with waived instream monitoring (Y/N): YES, since
May 2000.
Name of Monitoring Coalition: Upper Cape Fear River Basin Association (UCFRBA)
5. Compliance Summary
Summarize the compliance record with permit effluent limits (past 5 years): The facility has reported a
total of 84 limit violations over the past five years (February 2017-January 2022), involving BOD,
Cadmium, Fecal Coliform, NH3-N, and TSS exceedences. Seventy (70) of these proceeded to enforcement
cases, while eleven (11) proceeded to Notice of Violation (NOV) and three (3) to Notice of Deficiency.
Table 4. Monitoring Report Violations: 2017-2022.
Parameter r
Violation Type
Number of Violations
BOD
Monthly Average Exceeded
13
BOD
Weekly Average Exceeded
21
Total Cadmium
Monthly Average Exceeded
4
Fecal Coliform
Monthly Geometric Mean Exceeded
1
Fecal Coliform
-Weekly Geometric Mean Exceeded
4
Flow
Monthly Average Exceeded
1
Ammonia-N
Monthly Average Exceeded
12
Ammonia-N
Weekly Average Exceeded
28
TSS Al
Weekly Average Exceeded
1
A review of the Permittee's enforcement history includes a total of 17 penalties assessed since 2017. Two
of these enforcement cases are still open:
• LV-2022-0076 for a monitoring report violation in October 2021
• LV-2022-0041 for a monitoring report violation in September 2021.
The most recent violations reported in January 2022 have not been fully processed as of this writing.
Summarize the compliance record with aquatic toxicity test limits and any second species test results (past
5 years): The facility passed 17 of 20 quarterly chronic toxicity tests from March 2018-December 2021,
with three test failures, two of which had passed in subsequent tests. The third failed test occurred in
December 2021. The four required second species chronic toxicity tests, collected in March, June,
September and December 2017, passed as well as two additional tests in June and December 2021.
Summarize the results from the most recent compliance inspection: The most recent inspection was a
sampling compliance evaluation conducted on 3/16/2022, which found the facility to be out of compliance
and in upset condition since January 2022, due to receiving sludge from the water treatment plant,
undersized force main and pump station, plus blower issues in the oxidation ditches; the report has not yet
been prepared (Cheng Zhuang, Raleigh Regional Office, 3/22/2022). The prior insection, on 07/21/2020,
found effluent sampling to be in compliance. An inspection on 6/3/2020 focused on operations and
maintenance and sludge handling. The 6/3/2020 inspection report noted that the plant had insufficient
Page 8 of 24

storage space for waste sludge, causing high Mixed Liquor Settlable Solids (MLSS) and other issues.
According to the report, the ORC noted that the planned facility upgrade per the 2020 settlement agreement
will address the sludge capacity issues.
6. Water Quality -Based Effluent Limitations (WQBELs)
Dilution and Mixing Zones
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); 7Q10 streamflow (chronic Aquatic
Life; non -carcinogen HH); 30Q2 streamflow (aesthetics); annual average flow (carcinogen, HH).
If applicable, describe any other dilution factors considered (e.g., based on CORMIX model results): NA
If applicable, describe any mixing zones established in accordance with 15A NCAC 2B.0204(b): NA
Oxygen -Consuming Waste Limitations
Limitations for oxygen -consuming waste (e.g., BOD) are generally based on water quality modeling to
ensure protection of the instream dissolved oxygen (DO) water quality standard. Secondary TBEL limits
(e.g., BOD = 30 mg/L for Municipals) may be appropriate if deemed more stringent based on dilution and
model results.
If permit limits are more stringent than TBELs, describe how limits were developed: The current BOD
limits were set from a wasteload allocation (WLA) based on a Level-C model run in 1991. No changes are
proposed for the 4.0 MGD flow tier. The speculative limits for the 6.0 MGD expansion flow tier include
those that are the same as for the 4.0 MGD (BOD, TSS, summer NH3-N), more stringent (winter NH3-N,
DO), and new [summer Organic Nitrogen (NO2+NO3)], and are based on the following:
• BOD/NH3/TSS Limits. Assimilative capacity to protect the instream dissolved oxygen standard of
5.0 mg/L is based on prior stream modeling which showed that the receiving stream's dissolved
oxygen is sensitive to organic nitrogen. The resultant limits are considered technologically feasible.
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 ug/L) and capped at 28 ug/L (acute impacts). Due to analytical issues, all TRC values
reported below 50 ug/L are considered compliant with their permit limit.
Describe any proposed changes to ammonia and/or TRC limits for this permit renewal: The current NH3-
N limits were set from a wasteload allocation (WLA) based on a Level-C model run in 1991.
Ammonia and TRC were reviewed in the attached Wasteload Allocation (WLA) sheets for both the 4.0
MGD and 6.0 MGD flow tiers with the updated streamflow estimates provided by USGS. Current limits
for ammonia were found to be as stringent as the IWC-based calculated results in the WLA sheet and will
remain in the permit. The resulting allowable concentrations at 6.0 MGD are the same as those at 4 MGD.
Speculative ammonia limits for the 6.0 MGD flow tier were more stringent at the weekly average at 1.9
mg/L monthly average and 5.7 mg/L weekly average in winter, but the same as at 4.0 MGD in summer.
The speculative limits will be added to the permit for 6.0 MGD.
Page 9 of 24

The current TRC limit of 17 µg/L was first placed in the 1991 permit, capped at the water quality standard
of 17 µg/L. The resulting TRC allowable concentration from the IWC-based calculation is 17 µg/L at both
4.0 and 6.0 MGD. The submitted plans for the 6.0 MGD upgrade include installation of UV disinfection.
The current limit will be maintained in the current permit at 4.0 MGD, and will be carried over to 6.0 MGD
in the event that chlorination will be used as a backup to the planned UV system.
Reasonable Potential Analysis (RPA) for Toxicants
If applicable, conduct RPA analysis and complete information below.
The need for toxicant limits is based upon a demonstration of reasonable potential to exceed water quality
standards, a statistical evaluation that is conducted during every permit renewal utilizing the most recent
effluent data for each outfall. The RPA is conducted in accordance with 40 CFR 122.44 (d) (i). The NC
RPA procedure utilizes the following: 1) 95% Confidence Level/95% Probability; 2) assumption of zero
background; 3) use of 1/2 detection limit for "less than" values; and 4) 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 February 2018
and January 2022 for both the current 4.0 MGD permitted flow and the 6.0 MGD expansion flow tiers.
Pollutants of concern included toxicants with positive detections and associated water quality
standards/criteria. Based on this analysis, the following permitting actions are proposed for this permit:
• Effluent Limit with Monitoring. The following parameters will receive a water quality -based
effluent limit (WQBEL) since they demonstrated a reasonable potential to exceed applicable water
quality standards/criteria: None.
• Monitoring Only. The following parameters will receive a monitor -only requirement since they
did not demonstrate reasonable potential to exceed applicable water quality standards/criteria, but
the maximum predicted concentration was > 50% of the allowable concentration: Cadmium,
Chloride, Copper, Selenium, Silver at both flow tiers.
o Cadmium — 1 detect at 3 µg/L on 11/4/2019, and 47 nondetects < 2 µg/L; DWR lab PQL
= 0.5 µg/L and Allowable Cw = 1.636 µg/L at 4.0 MGD and 1.632 µg/L at 6.0 MGD.
Samples shall be tested and reported to the lower reporting level.
o Selenium — all nondetects, 15 out of 16 < 10 µg/L; DWR lab PQL = 1.0 µg/L and Allowable
Cw = 5.1 µg/L at 4.0 MGD and 5.0 µg/L at 6.0 MGD. Samples shall be tested and reported
to the lower reporting level.
o Silver all nondetects < 5 µg/L; DWR lab PQL = 1.0 µg/L and Allowable Cw = 0.061
µg/L at both flow tiers. Samples shall be tested and reported to the lower reporting level.
o Chloride, Copper — based on effluent data.
• 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: Arsenic,
Beryllium, Total Phenolic Compounds, Total Chromium, Cyanide, Lead, Molybdenum, Nickel and
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: None.
o The following parameter(s) will receive a monitor -only requirement, since as part of a
limited data set, one sample exceeded the allowable discharge concentration: Bis (2-
ethylhexyl) phthalate at both flow tiers.
Page 10 of 24

o No Limit or Monitoring: The following parameters that showed detections will not receive
a limit or monitoring, since they did not demonstrate reasonable potential to exceed
applicable water quality standards/criteria based on limited dataset (n < 8 samples):
Chloroform, Dichlorobromomethane.
If applicable, attach a spreadsheet of the RPA results as well as a copy of the Dissolved Metals
Implementation Fact Sheet for freshwater/saltwater to this Fact Sheet. Include a printout of the RPA
Dissolved to Total Metal Calculator sheet if this is a Municipality with a Pretreatment Program.
Toxicity Testing Limitations
Permit limits and monitoring requirements for Whole Effluent Toxicity (WET) have been established in
accordance with Division guidance (per WET Memo, 8/2/1999). Per WET guidance, all NPDES permits
issued to Major facilities or any facility discharging "complex" wastewater (contains anything other than
domestic waste) will contain appropriate WET limits and monitoring requirements, with several exceptions.
The State has received prior EPA approval to use an Alternative WET Test Procedure in NPDES permits,
using single concentration screening tests, with multiple dilution follow-up upon a test failure.
Describe proposed toxicity test requirement: Siler City WWTP is a Major POTW discharging complex
wastewater with a chronic WET limit capped at 90% effluent, based on the instream waste concentration
(IWC) calculation using the permitted flow of 4.0 MGD and updated summer minimum stream flow 7Q10
of 0.09 cfs. WET testing will continue on a quarterly frequency. For the 6.0 MGD flow tier, the chronic
WET limit capped at 90% effluent will be added to the permit, based on the IWC calculation using the
expansion flow and updated summer 7Q10.
Mercury Statewide TMDL Evaluation
There is a statewide TMDL for mercury approved by EPA in 2012. The TMDL target was to comply with
EPA's mercury fish tissue criteria (0.3 mg/kg) for human health protection. The TMDL established a
wasteload allocation for point sources of 37 kg/year (81 lb/year), and is applicable to municipals and
industrial facilities with known mercury discharges. Given the small contribution of mercury from point
sources (-2% of total load), the TMDL emphasizes mercury minimization plans (MMPs) for point source
control. Municipal facilities > 2 MGD and discharging quantifiable levels of mercury (> 1 ng/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.
The current permit contains an MMP special condition. The Permittee included a summary of MMP actions
taken in their submitted Annual Pretreatment Report Narrative, dated February 19, 2021.
Describe proposed permit actions based on mercury evaluation: Review of effluent data from February
2018 through January 2022 revealed no annual average mercury concentration exceeded the WQBEL, and
no individual mercury sample exceeded the TBEL at either flow tier (Table 5). Therefore, no mercury limit
is required. Because the facility's permitted flow is greater than 2 MGD and mercury levels > 1 ng/L were
detected among samples, a mercury minimization plan (MMP) is required and will be maintained in the
permit.
Page 11 of 24

Table 5. Mercury Effluent Data Summary.
Parameter
2018
2019
2020
2021
No. of Samples
4
4
4
5
Annual Average Conc. ng/L
10.0
2.8
4.0
1.0
Maximum Conc., ng/L
30.00
4.47
12.7
3.15
TBEL, ng/L
47
WQBEL, ng/L at 4.0 MGD
12.17
WQBEL, ng/L at 6.0 MGD
12.12
Other TMDL/Nutrient Management Strategy Considerations
If applicable, describe any other TMDLs/Nutrient Management Strategies and their implementation within
this permit: The facility lies in the Rocky River watershed, which has a history of algal blooms,
Chlorophyll -a exceedences and excessive nutrient issues since prior to 1990. The watershed does not
currently have a TMDL or nutrient management strategy, but the WWTP has nutrient requirements in its
permit to address downstream Chlorophyll -a issues.
Nutrient requirements in the form of a summer monthly limit of 0.5 mg/L TP with weekly monitoring were
first placed in the permit in 1996. The TP requirements were based on the recommendations of the
Division's 1991 Rocky River Subbasin Nutrient Budget report, which concluded that the Rocky River was
TP-limited and controlling effluent TP was the best approach to control instream algal blooms. The current
seasonal quarterly TP limits of 0.5 mg/L summer and 2.0 mg/L winter were added in the 2008 permit
modification. Effluent TN monitoring was increased from monthly to weekly and TN components of TKN
and NO2+NO3 weekly monitoring were also added in that modification as was a nutrient removal
optimization plan special condition. The changes were based on recommendations in a public hearing report
dated July 14, 2008.
Siler City lost two poultry processing facilities in 2008 and 2011 followed by a significant decrease in
Effluent TN concentration. In the 2014 permit renewal, the nutrient removal optimization plan special
condition was removed and replaced by a nutrient reopener special condition with a trigger mechanism for
evaluation of any future high nutrient -bearing industries. In December 2016 the reopener was triggered
when the Town informed the Division of Mountaire Farms' plans to locate a processing facility in Siler
City. The permit was reopened in June 2017, and a modification issued in April 2019, following a public
hearing in 2018. Nutrient -related changes included a Total Nitrogen (TN) load limit of 73,058 lb/yr, to
become effective no later than January 1, 2023; and an interim TN load limit of 243,455 lb/yr, effective
from January 1, 2020 through December 31, 2022.
The modified permit was contested by the Permittee and Rocky River Watch on May 30, 2019. The
petitions to contest the permit were consolidated and a settlement agreement was signed on June 5, 2020.
One of the settlement agreement conditions is to test facility optimization under current configuration as
proposed in the Preliminary Wastewater Nitrogen Removal Optimization Plan, prepared in October 2019.
The resulting report, Wastewater Nitrogen Removal Optimization Plan Results and Recommendations,
prepared in October 2020, concludes that the facility can achieve the target effluent concentration of 15
mg/L or less TN as specified in the Settlement Agreement. TN limits are in place in terms of loading, and
concentration monitoring will be maintained in the permit.
The engineering report submitted with the permit application proposed a target TN loading of 73,058 lb/yr
with the first phase of facility upgrade at 4.0 MGD and 54,800 lb/yr with the second phase at 6.0 MGD.
Page 12 of 24

Based on the Permittee's concerns of timing issues and potential upsets during the first phase when one
treatment train is taken out of service for nutrient improvement installation, the proposed construction was
revised to a single phase for the 6.0 MGD expansion with a proposed effective date of January 1, 2025 for
the final TN load limit of 54,800 lb/yr, approved by the Division on 3/15/2022. The above interim TN load
limits of 243,455 lb/yr and 73,058 lb/yr will be maintained in the permit at 4.0 MGD with an additional
interim limit of 63,929 lb/yr (the average of 73,058 lb/yr limit for one-half year and 54,800 lb/yr limit for
one-half year) effective in each successive year (Table 6.). A compliance schedule for the 6.0 MGD
expansion and TN load limits will be added to the permit.
Table 6. Total Nitrogen interim and final effluent load limits for compliance schedule.
Limit Type
Annual Load Limit (lb/yr)
Flow Tier (MGD)
Effective Dates
Interim
243,455
4.0
Permit effective date — 12/31/2022
Interim
73,058
4.0
1/1/2023 — 12/31/2023
Interim
63,929
4.0 / 6.0
1/1/2024 — 12/31/2024 or upon 6.0
MGD expansion
Final
54,800
6.0
Beginning 1/1/2025 or upon 6.0
MGD expansion
To further address nutrient loadings as well as protection of the dissolved oxygen w quality standard
from organic nitrogen, summer (April -October) limits of 3.0/4.5 mg/L monthly avera e/weekly average
NO2+NO3 will be added to the permit at the 6.0 MGD flow tier.
Other WQBEL Considerations
If applicable, describe any other parameters of concern evaluated for WQBELs: Siler City WWTP had
participated in a basin -wide survey for the emerging contaminants 1,4-Dioxane and PFAS chemical group
in 2019. Three rounds of influent sampling were conducted in July, August and September 2019, results
of which were submitted along with a completed Chemical Addendum form for all 40 CFR 136 pollutants,
received on 3/1/2022. Reviewed data from the sampling found effluent concentrations to be below the EPA
Drinking Water Health Advisory Levels (HALs) for 1,4-Dioxane and PFAS + PFOA (Table 7).
Table 7. Influent Monitoring Results of Emerging Contaminants, July -August 2019.
Parameter
Average (Range), µg/L 1 HAL (µg/L)
1.29 (< 1.0-1.58)
35
1,4-Dioxane '
PFOA + PFOS
I 8.87 (7.60-11.15)
70
The POTW lies in the Cape Fear River Basin, where high levels of 1,4-Dioxane have been reported. The
Siler City WWTP discharges into a Class C waterbody with the nearest water supply boundary at 43.9 miles
downstream. Because 1,4-Dioxane was detected in the influent at a concentration high enough for further
evaluation, monthly monitoring for this parameter will be added to the permit. In addition, a permit reopener
special condition regarding 1,4-Dioxane based on changes toward limits, monitoring or treatment will be
added to the permit.
Based on detection of PFAS chemicals in the influent from the 2019 samplings, which was also provided
via as an attachment to the NPDES application received on 1/4/2022, monitoring of PFAS chemicals will
be added to the permit at a frequency of 2/year, since the preliminary data are well below the HAL. Since
an EPA method for sampling and analyzing PFAS in wastewater is not currently available, the PFAS
sampling requirement in the Permit includes a compliance schedule which delays the effective date of this
requirement until the first full calendar quarter beginning 6 months after EPA has a final wastewater method
Page 13 of 24

in 40 CFR136 published in the Federal Register. This date may be extended upon request and if there are
no NC -certified labs.
If applicable, describe any special actions (HQW or ORW) this receiving stream and classification shall
comply with in order to protect the designated waterbody: NA
If applicable, describe any compliance schedules proposed for this permit renewal in accordance with 15A
NCAC 2H.0107(c)(2)(B), 40CFR 122.47, and EPA May 2007 Memo: A compliance schedule has been
added to the permit for the expansion to 6.0 MGD and corresponding TN load limit of 54,800 lb/yr, with
the TN load limit compliance date of January 1, 2025.
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 BOD5/TSS for Weekly Average). YES
Are 85% removal requirements for BODS/TSS 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 2B .0201. Each applicant for a new/expanding NPDES permit must
document an effort to consider non -discharge alternatives per 15A NCAC 2H .0105(c)(2). In all cases,
existing instream water uses and the level of water quality necessary to protect the existing use is maintained
and protected.
If applicable, describe the results of the antidegradation review, including the Engineering Alternatives
Analysis (EAA) and any water quality modeling results: A preliminary engineering report dated February
2021 was submitted with the permit modification application on April 30, 2021. Review of the Engineering
Report found it incomplete with an incomplete accounting of protected species, incomplete evaluation of
alternatives (including incomplete economic feasibility evaluations) and an outdated estimate project
schedule. A revised Engineering Report was received on 8/18/2021 and was found complete.
The report includes an evaluation of four alternatives, including: 1) no action, 2) connection to a regional
WWTP, 3) wastewater irrigation or reuse of additiona flow, and 4) upgrade and expansion of the WWTP
to 6.0 MGD. The fourth alternative was selected as the others were deemed infeasible.
The expansion of the facility to 6.0 MGD and include following upgrades: an expanded headworks and
influent pump station; a third oxidation ditch with nutrient removal modifications as described above along
with a third clarifier; denitrification effluent filters; UV disinfection; a new solids handling facility; and an
upgraded influent sewer to handle flow from Mountaire Farms. Projected TN discharge is 54,800 lb/yr
(based on 3 mg/L) at 6.0 MGD.
Page 14 of 24

Speculative limits for the 6.0 MGD expansion were prepared on 9/20/2021 and are tabulated below.
Table 8. Speculative Limits for 6.0 MGD expansion.
Effluent Characteristic
Effluent Limitations
Monthly
Average
Weekly
Average
Daily
Maximum
Flow
6.0 MGD
BOD5 (Apr. -Oct.)
5.0 mg/L
7.5 mg/L
BOD5 (Nov. -Mar.)
10.0 mg/L
15.0 mg/L
TSS 1
20 mg/L
30 mg/L
NH3 as N (Apr. -Oct.)
1.0 mg/L
3.0 mg/L
NH3 as N (Nov. -Mar.)
1.8 mg/L
5.4 mg/L
Dissolved Oxygen
(minimum daily average)
7.0 mg/L
jr
TRC
17 µg/L
Fecal coliform (geometric
mean)
200/100 mL
400/100 mL
Organic Nitrogen (Apr. -Oct.)
3.0 mg/L
4.5 mg/L
Total Nitrogen Load
54,800 lbs/year 2
Total Phosphorus (Apr. -Oct.) '
0.5 mg/L
(quarterly average)
/
Total Phosphorus (Nov. -Mar.) 3
2.0 mg/L
(quarterly average)
Chronic Toxicity Pass/Fail
(Quarterly test)
90%
Footnotes:
1. TSS is reduced based on addition of denitrification filters as part of final effluent treatment.
2. Equivalent to a 3.0 mg/L concentration (on an annual basis). Monitor and report pounds per month.
3. Total Phosphorus requirements will be consistent with the existing permit.
9. Antibacksliding Review
Sections 402(o)(2) and 303(d)(4) of the CWA and federal regulations at 40 CFR 122.44(1) prohibit
backsliding of effluent limitations in NPDES permits. These provisions require effluent limitations in a
reissued permit to be as stringent as those in the previous permit, with some exceptions where limitations
may be relaxed (e.g., based on new information, increases in production may warrant less stringent TBEL
limits, or WQBELs may be less stringent based on updated RPA or dilution).
Are any effluent limitations less stringent than previous permit (YES/NO): NO
If YES, confirm that antibacksliding provisions are not violated: NA
Page 15 of 24

10. Monitoring Requirements
Monitoring frequencies for NPDES permitting are established in accordance with the following regulations
and guidance: 1) State Regulation for Surface Water Monitoring, 15A NCAC 2B.0500; 2) NPDES
Guidance, Monitoring Frequency for Toxic Substances (7/15/2010 Memo); 3) NPDES Guidance, Reduced
Monitoring Frequencies for Facilities with Superior Compliance (10/22/2012 Memo); 4) Best Professional
Judgement (BPJ). Per US EPA (Interim Guidance, 1996), monitoring requirements are not considered
effluent limitations under Section 402(o) of the Clean Water Act, and therefore anti -backsliding
prohibitions would not be triggered by reductions in monitoring frequencies.
The current permit has reduced monitoring frequencies for BOD, TSS, and Fecal Coliform, requested by
the Permittee in 2015. The Permittee requested to maintain reduced monitoring frequencies for the above
parameters plus Ammonia on January 6, 2021. Upon review, the facility's compliance status on EPA's
ECHO detailed history report is Significant/Category 1 Noncompliance, yielding the facility not eligible
for reduced monitoring frequencies. All target parameters will have monitoring increased to daily.
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
Tables 9 and 10 summarize permit conditions and proposed changes affecting effluent parameters at 4.0
and 6.0 MGD, respectively. Table 10 summarizes permit conditions and proposed changes affecting
instream parameters.
Table 9. Current Permit Conditions and Proposed Changes at 4.0 MGD flow 1.
Parameter I
Current Permit
Proposed Change
Basis for Condition/Change
Flow
MA = 4.0 MGD
No change
15A NCAC 2B .0505
Total Monthly Flow
(TMF)
Monitor monthly
No change
For calculation of Total Nitrogen
and Total Phosphorus loads.
Biological Oxygen
Demand, 5-day
(BOD5)
Summer
MA = 5.0 mg/L
WA = 7.5 mg/L
Winter
MA = 10.0 mg/L
WA = 15.0 mg/L
Monitor 2/week
No change in limits
Monitor daily
WQBEL. Based on protection of
DO standard via Wasteload
Allocation (WLA) calculated in
1987 and 1989. Monitoring
Frequency Reduction (MFR)
criteria were not met.
Page 16 of 24

Parameter
Current Permit
_ Proposed Change
Basis for Condition/Change
Total Suspended
Solids (TSS)
MA — 30.0 mg/L
WA = 45.0 mg/L
Monitor 2/week
No change in limits
Monitor daily
TBEL. Secondary treatment
standards / 40 CFR 133 / 15A
NCAC 2B .0406. MFR criteria
were not met.
Ammonia-N
Summer
No change
WQBEL. Calculation results
based on NC's use of EPA criteria
in developing 1.0 mg/L summer
and 1.8 mg/L winter values in
wasteload allocations to protect
against NH3-N toxicity (see WLA
sheet attached). MFR criteria
were not met.
MA 1.0 mg/L
WA = 3.0 mg/L
Winter
MA = 2.0 mg/L
WA = 6.O mg/L
Monitor daily
(NH3-N)
Fecal Coliform
(geometric mean)
MA = 200 cfu/100 mL
WA = 400 cfu/100 mL
Monitor 2/week
No change in limits
Monitor daily
WQBEL. State WQ standard, 15A
NCAC 2B .0200. MFR criteria
were not met.
Total Residual
Chlorine (TRC)
DM = 17 µg/L
Monitor daily
No change
WQBEL. State WQ standard, 15A
NCAC 2B .0200 and .0500.
Dissolved Oxygen
(DO)
>_ 6 mg/L
Monitor daily
No change
WQBEL. Based on protection of
the DO standard, 15A NCAC 2B
.0200 and .0500.
Temperature
Monitor daily
No change
State WQ reporting requirements
15A NCAC 2B .0500.
pH
6-9 SU
Monitor daily
No change
WQBEL. State WQ standard, 15A
NCAC 2B .0200 and .0500.
Conductivity
No requirement
Add daily monitoring
State WQ reporting requirements
15A NCAC 2B .0500. Increased
downstream levels suggest
effluent impact.
NO3 + NO2
Monitor weekly
No change
For TN calculation, 15A NCAC
02B .0500.
TKN
Monitor weekly
No change
For Total Nitrogen (TN)
calculation, 15A NCAC 02B
.0500.
Total Nitrogen (TN)
Monitor weekly
No change
State WQ reporting requirements
15A NCAC 2B .0500.
Page 17 of 24

Parameter
Current Permit
Proposed Change
Basis for Condition/Change
TN Load
Interim limit:
243,455 lb/yr (eff.
1/1/2020-
12/31/2022)
Final limit:
73,058 lb/yr (eff.
1/1/2023)
Monitor monthly,
annually
Interim limits:
• 243,455 lb/yr (eff.
through 12/31/2022)
• 73,058 lb/yr (eff.
1/1/2023-12/31/2023)
• 63,929 lb/yr (eff.
1/1/2024-12/31/2024*)
Final limit:
54,800 lb/yr (eff.
1/1/2025*)
Add compliance
schedule for expansion
& final limits
Monitor monthly,
annually
WQBEL. To protect the
Chlorophyll -a water quality
standard.
*Or upon 6.0 MGD flow
expansion.
Total Phosphorus
Summer
QA = 0.5 mg/L
Winter
QA = 2.0 mg/L
Monitor weekly
No change
Summer limit: Rocky River
Subbasin Nutrient Budget
(Division 1991 document)
recommendations to control
algal blooms.
Winter limit: Public Hearing
Officer's recommendation to
contested 2007 permit renewal.
Nutrient Reopener
Special Condition
No change
NCAC 02H .0100 [permit
approval procedures for point
discharges]
Nutrient Water
Quality Modeling
Reopener
Special Condition
No change
NCAC 05H .0100; 2005 Cape
Fear River Basinwide Water
Quality Plan recommentation
0
Total Hardness
No requiremet
Add quarterly
monitoring
Hardness -dependent dissolved
metals water quality standards,
approved in 2016, need effluent
and instream hardness data for
calculations of permit limitations.
Total Cadmium
MA = 2.1 µg/L
DM = 15.5 µg/L
Monitor quarterly
Reasonable potential found to
exceed state water quality
standards (WQS) by one detect at
3 µg/L. All other data nondetects
> PQL and above allowable
concentration.
Total Copper
Monitor quarterly
No change
No RP found, but predicted
maximum value > 50% of
allowable concentration.
Total Selenium
No requirement
Add quarterly
monitoring
All data nondetects > PQL and
above allowable concentration.
Total Silver
No requirement
Add quarterly
monitoring
All data nondetects > PQL and
allowable concentration.
Page 18 of 24

Parameter
Current Permit
Proposed Change
Basis for Condition/Change
Total Zinc
Monitor quarterly
Remove from permit
No RP found and predicted
maximum value < 50% of
Allowable Cw.
Chloride
Monitor quarterly
No change
No RP found, but predicted
maximum value > 50% of
allowable concentration.
Bis (2-ethylhexyl)
phthalate
No requirement
Add quarterly
monitoring
RP found for limited dataset (n <
8 samples) with all values
including 2 nondetects above
allowable concentration.
1,4-Dioxane
No requirement
Add monthly
monitoring; add
reopener condition
1,4-Dioxane detected, limited data
(< 12 samples).
PFAS
No requirement
Add monitoring 2/year
with delayed
implementation
Based limited influent data
showing detection, more results
are needed to evaluate.
Implementation delayed until after
EPA certified method becomes
available.
Total Mercury
Mercury Minimization
Plan (MMP)
Maintain MMP
In accordance with 2012
Statewide Mercury TMDL
Implementation, per facility size
'and monitoring data criteria.
Toxicity Test
Chronic Ceriodaphnia
dubia Pass/Fail at
90% effluent, monitor
quarterly
No change
WQBEL. No toxics in toxic
amounts. 15A NCAC 02B .0200,
15A NCAC 02B .0500.
Effluent Pollutant
Scan
Three times per permit
cycle
Update sample years to
2023, 2024 and 2025
40 CFR 122
Electronic Reporting
Special Condition
Update condition to
remove submittal of
hardcopies and extended
Phase 2 deadline to
2025.
In accordance with EPA
Electronic Reporting Rule 2015,
and final regulation change
published in the November 2,
2020 Federal Register.
Footnote.
1. MGD = Million gallons per day; MA = Monthly Average; WA = Weekly Average; DM = Daily
Maximum; QA = Quarterly Average.
Table 10. Proposed Permit Conditions at 6.0 MGD flow 1.
Parameter Proposed Condition
r•
Basis for Condition
Flow
MA = 6.0 MGD
15A NCAC 2B .0505
Total Monthly Flow
(TMF)
Monitor monthly
For calculation of Total Nitrogen and Total
Phosphorus loads.
Page 19 of 24

Parameter
Proposed Condition
Basis for Condition
Biological Oxygen
Demand, 5-day
(BOD5)
Summer
MA = 5.O mg/L
WA = 7.5 mg/L
Winter
MA = 10.0 mg/L
WA = 15.0 mg/L
Monitor daily
WQBEL. Based on speculative limits for protection
of DO standard. State WQ reporting requirements
15A NCAC 2B .0500.
Total Suspended
Solids (TSS)
MA = 20.0 mg/L
WA = 30.0 mg/L
Monitor daily
TBEL. Based on speculative limits for protection of
the DO standard. State WQ reporting requirements
15A NCAC 2B .0500.
Ammonia-N (NH3-N)
Summer
MA = 1.0 mg/L
WA = 3.0 mg/L
Winter
MA = 1.9 mg/L
WA = 5.7 mg/L
Monitor daily
I
WQBEL. Based on speculative limits for protection
of the DO standard.
Fecal Coliform
(geometric mean)
MA = 200 cfu/100 mL
WA = 400 cfu/100 mL
Monitor daily
WQBEL. State WQ standard, 15A NCAC 2B .0200
and .0500.
Total Residual
Chlorine (TRC)
DM = 17 µg/L
Monitor daily
WQBEL. State WQ standard, 15A NCAC 2B .0200
and .0500. To be implemented when chlorination is
used.
Dissolved Oxygen
(DO)
? 7 mg/L
Monitor daily
WQBEL. Based on speculative limits for protection
of the DO standard, 15A NCAC 2B .0200 and .0500.
Temperature
Monitor daily
State WQ reporting requirements 15A NCAC 2B
.0500.
A
pH
6-9 SU
Monitor daily
WQBEL. State WQ standard, 15A NCAC 2B .0200
0 and .0500.
Conductivity
Add daily monitoring
State WQ reporting requirements 15A NCAC 2B
.0500.
Total Organic
Nitrogen
MA = 3.0 mg/L
WA = 3.0 mg/L
Monitor weekly (Apr. -Oct.)
WQBEL. Based on speculative limits to protect the
instream DO standard.
NO3 + NO2
Monitor weekly
For Total Nitrogen (TN) calculation, 15A NCAC
02B .0500.
TKN
Monitor weekly
For Total Nitrogen (TN) calculation, 15A NCAC
02B .0500.
Total Nitrogen (TN)
Monitor weekly
WQBEL. Based on speculative limits for protection
of the Chlorophyll -a standard per 2020 Settlement
Agreement. State WQ reporting requirements 15A
NCAC 2B .0500.
TN Load
Weighted limit = 63,9291b/yr
(eft'. 1/1/2024-1/1/2025*)
WQBEL. Based on speculative limits for protection
of the Chlorophyll -a standard.
Page 20 of 24

Final limit = 54,800 lb/yr (eff.
1/1/2025)
Monitor monthly
*Effective 1/1/2024, provided expansion is
completed by 12/31/2023. Average of previous and
final limit (each for 6 months of the year). This
effectively places the final limit in effect in July 1,
2024; however, it is a calendar year limit.
Total Phosphorus
Summer
QA = 0.5 mg/L
Winter
QA = 2.0 mg/L
Monitor weekly
WQBEL. Based on speculative limits for protection
of the Chlorophyll -a standard.
Summer limit: Rocky River Subbasin Nutrient
Budget (Division 1991 document)
recommendations to control algal blooms.
Winter limit: Public Hearing Officer's
recommendation to contested 2007 permit renewal.
Nutrient Reopener
Special Condition
NCAC 02H .0100 [permit approval procedures for
point discharges]
Nutrient Water
Quality Modeling
Reopener
Special Condition
NCAC 05H .0100; 2005 Cape Fear River Basinwide
Water Quality Plan recommentation
Total Hardness
Monitor quareterly
Hardness -dependent dissolved metals water quality
standards, approved in 2016, need effluent and
instream hardness data for calculations of permit
limitations.
Total Cadmium
Monitor quarterly
Reasonable potential found to exceed state water
quality standards (WQS) by one detect at 3 µg/L. All
other data nondetects > PQL and above allowable
concentration.
Total Copper
Monitor quarterly
No RP found, but predicted maximum value > 50%
of allowable concentration.
Total Selenium
Monitor quarterly
All data nondetects; 15 out of 16 > PQL and above
$owable concentration.
Total Silver
Monitor quarterly
All data nondetects > PQL and allowable
concentration.
Chloride I
Monitor quarterly
No RP found, but predicted maximum value > 50%
of allowable concentration.
Bis (2-ethylhexyl)
phthalate
Monitor quarterly
RP found for limited dataset (n < 8 samples) with all
values including 2 nondetects above allowable
concentration.
1 4-Dioxane
'
Monitor monthly; add
reopener special condition
1,4-Dioxane detected, limited data (< 12 samples).
PFAS
Add monitoring 2/year with
delayed implementation
Based limited influent data showing detection, more
results are needed to evaluate. Implementation
delayed until after EPA certified method becomes
available.
Total Mercury
Mercury Minimization Plan
(MMP)
In accordance with 2012 Statewide Mercury TMDL
Implementation, per facility size and monitoring data
criteria.
Page 21 of 24

Parameter
Proposed Condition
Basis for Condition
Toxicity Test
Chronic Ceriodaphnia dubia
Pass/Fail at 90% effluent,
monitor quarterly
WQBEL. No toxics in toxic amounts. 15A NCAC
02B .0200, 15A NCAC 02B .0500.
Effluent Pollutant
Scan
Three times per permit cycle
40 CFR 122
Electronic Reporting
Special Condition
In accordance with EPA Electronic Reporting Rule
2015.
Footnote on next page
Footnote.
1. MGD = Million gallons per day; MA = Monthly Average; WA = Weekly Average; DM = Daily
Maximum; QA = Quarterly Average.
Table 11. Current Permit Conditions and Proposed Changes for Instream Monitoring.
Parameter
Current Permit
Proposed Change
Basis for Condition/Change
Dissolved Oxygen
(DO)
Up- and downstream
Loves Creek, up- and
downstream Rocky
River at frequencies:
3/week (Jun —Sep)
1/week (Oct —May)
No change
15A NCAC 02B .0500
Temperature
i
Up- and downstream
Loves Creek, up- and
downstream Rocky
River at frequencies:
3/week (Jun —Sep)
1/week (Oct —May)
No change
15A NCAC 02B .0500
INdownstream
Fecal Coli
No requirement
Add up- and
Loves
Creek, up- and
downstream Rocky
River at 1/month
2020 Settlement Agreement
Conductivity
No requirement
Add up- and
downstream Loves
Creek, up- and
downstream Rocky
River at frequencies:
2/month (May —Sep)
1/month (Oct —Apr)
Data assessment
Total Phosphorus
(TP)
Up- and downstream
Loves Creek, up- and
downstream Rocky
River at frequencies:
3/week (Jun —Sep)
1/week (Oct —May)
No change
1991 Division's Rocky River
Nutrient Budget recommendations;
data assessment.
Page 22 of 24

Parameter
Current Permit
Proposed Change
Basis for Condition/Change
Total Kjeldahl
Nitrogen (TKN)
Up- and downstream
Loves Creek, up- and
downstream Rocky
River at frequencies:
3/week (Jun —Sep)
1/week (Oct —May)
No change
1991 Division's Rocky River
Nutrient Budget recommendations
implemented in 2014 permit; data
assessment.
Nitrate -Nitrite
Nitrogen (NO3+NO2)
Up- and downstream
Loves Creek, up- and
downstream Rocky
River at frequencies:
3/week (Jun —Sep)
1/week (Oct —May)
No change
1991 Division's Rocky River
Nutrient Budget recommendations
implemented in 2014 permit; data
assessment
Ammonia-N (NH3-N)
No requirement
Add up- and
downstream Loves
Creek, up- and
downstream Rocky
River at 1/month
Data assessment
Total Hardness
(as CaCO3)
No requirement
Add upstream Loves
Creek at 1/quarter
Hardness -dependent dissolved
metals water quality standards,
approved in 2016, need effluent and
instream hardness data for
calculations of permit limitations.
13. Public Notice Schedule:
Permit to Public Notice: 03/23/2022
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 [e-mail].
15. Fact Sheet Addendum (if applicable):
Were there any changes made since the Draft Permit was public noticed (Yes/No): NO
If Yes, list changes and their basis below: NA
Page 23 of 24

16. Fact Sheet Attachments (if applicable):
• Reduced Monitoring Frequency Request letter
• NPDES/PT POC Review sheet
• USGS e-mail with updated streamflow estimates
• NC 2020 Intagrated Report, p 138
• NC 2020 303(d) list, p. 16
• Loves Creek Benthos Site details page
• Effluent data trend charts and data summaries
• DMR comments
• Instream monitoring trend charts and data summaries
• Monitoring Report (MR) Violations sheet
• WET Testing and Self Monitoring sheet, page 89
• Compliance Evaluation Reports: 07/21/2020 (sampling compliance), 06/03/2020 (O&M, sludge
handling)
• NH3/TRC WLA Calculations sheets for 4.0 MGD and 6.0 MGD
• RPA Spreadsheet Summaries for 4.0 MGD and 6.0 MGD
• Dissolved Metals Implementation/Freshwater
• Mercury Data Statistics tables and data for 4.0 MGD and 6.0 MGD
• Annual Pretreatment Report Narrative, 02/19/2021
• Monitoring Reduction Evaluation spreadsheet
• EPA ECHO Detailed Facility Report
• Speculative Limits letter for 6.0 MGD expansion, 9/20/2021
• Updated proposed expansion schedule and DWR approval letter
• Chemical Addendum
Page 24 of 24

4.4
Tram of !rarer Cttp
Town Manager's Office
January 06,2021
Attn: Gary Perlmutter
1617 Mail Service Center
Raleigh, NC 27699-1617
Subject: NPDES Permit Modification Request
Sampling Reduction Request
NPDES Permit #NC0026441
Town of Siler City, Chatham County
Dear Mr. Perlmutter,
The Town of Slier City is requesting to continue the reduced monitoring that was previously approved on our last
permit cycle (2015) for NPDES# NC0026441. We are requesting that the monitoring for BODs, TSS, Ammonia
Nitrogen and Fecal Coliform continue to be reduced to the criteria to two times a week. The attached data
(summarized in the following table) indicates that the WWTP effluent has exceeded the minimum criteria for
reduced monitoring. in addition to the test results attached, the Siler City WWTP follows all other criteria listed in
Section B Approved Criteria of the October 22,2012 guidance document regarding reduction of monitoring
frequencies. The data used for the analysis was for the period ofJanuary 2016 — December 2018.
The Town appreciates the Division's effort to reduce the regulatory and monetary burden on systems that strive
consistently to provide exceptional wastewater treatment. We thank you for your consideration in this matter. If
you have any additional questions or comments, please call Brittany York at 919-742-4581.
If you have any questions, please do not hesitate to contact me.
Sincerely,
Roy Lynch
cc: Chris McCorquodale, Public Works and Utilities Director, Brittany York, Wastewater Superintendent
Roy Lynch
Town Manager
PO Box 769.311 N Second Avenue
Mier City, NC 27344-0769
[e-mail]
Phone: [phone] • Fax: [phone]
www.silercity,org
To advance a framework for our success through balanced governance, dynamic partnerships, and an engaged community.

Three Year Data Summary - Siler City NPDED # 0026441
2016 BOD Ave. BOD Max. TSS Ave. TSS Max. FC Ave. F
January
2.3
5
0.3
2.7
2
3
0.1
...., 1.w...
February
3.1
5,4
1.1
5.7
2
10
0,3
3.7
March
1.5
4.7
0,0
<2.5
2
14
0.1
1.5
April
3.0
4.9
0.0
<2.5
10
53
0.1
1.7
May
1.5
4.7
0.0
<2,5
17
42
0.0
<0.5
June
0.0
0
0.0
<2.5
22
34
0,0
-
<0.5
July
0.0
0
_ 0.0
<2.5
34
181
0.0
<0.5
August
0.5
4.5
0.0
<2.5
25
390
0.0
<0.5
September
2.4
10.3
1,2
5,7
25
1414
0.0
<0.5
October
0.3
3.3
0.9
2.4
4
39
0.5
3.3
November
0.9
2.7
0.0
<2.5
2
8
0.0
<0.5 _
December
2.0
3.9
1.2
8.5
2
7
1.0
6.5
2017 BOD Ave. BOD Max. TSS Ave, TSS Max. FC Ave. F
January
2.5
2.5
6.7
6.7
1
2
1.1
v
1.8
February
3.4
4.9
1.0
1.0
3
5
0.0
<0.5
March
3.1
4.3
1.0
<2.5
1
0
0.0
<0.5
April
3.2
5.0
22.3
22.3
28
4
2.2
2.7
May
4.4
11.8
5.5
<2.5
10
16
0.0
<0.5
June
4.9
7.1
1.0
7.1
26
240
0.0
<0.5
July
3.3
6.2
1.3
<2.5
22
55
0.0
<0.5
August
4.0
5.7
0.0
<2.5
16
30
0.0
<0.5
September
5,0
6.9
0.0
<2.5
16
75
0.0
<0.5
October
5.7
8.3
0.0
<2.5
5
21
0.0
_
<0,5
November
1.1
5.6
0.0
<2.5
2
0
0.0
<0.5
December
0,0
<2.0
0.0
<2.5
3
7
0.0
0.5
2018 BOD Ave. BOO Max. TSS Ave. TSS Max. FC Ave. FC Max.
January
0.9
3.8
0.0
<2.5
9
85
0.0
<0,5
February
0.4
2.8
0.0
<2.5
1
1
0.0
<0.5
March
1.2
8.2
0.0
<2.5
1
0
0.0
<0.5
April
0.8
4.5
0.0
<2.5
3
9
0,0
<0,5
May
1.4
3,6
0.0
<2.5
6
22
0.0
<0.5
June
1.0
3.2
0.0
<2.5
28
590
0.0
<0.5 -
July
0.9
3.6
0.0
<2.5
11
25
0.0
<0.5
August
1.1
4.0
0.0
<2.5
17
127
0.0
_
<0.5
September
1.0
5.2
2.3
18.5
4
22
0.0
<0.5
October
0.2
2.0
0.0
<2.5
5
40
0.0
<0.5
November
0.0
2.0
0.4
3.4
2
5
0.0
<0.5
December
0.4
31.0
1.2
6.5
1
1
0.0
<0.5
3-Year Arithmetic Average
3-Year Geometric Mean Average
Permit Limit
% of Limit 37.4%
1.9
5
1.3
30.0
4.4%
5.7
200
0.1
1.0
2.9% 14.7 Y

NPDES/PT
POCs Review Form Version:2021.00
NPDES PERMIT WRITER (PW) COMPLETES when drafting NPDES permit:
Date of Review
8/12/2021
Gary Perlmutter
i'own of Siler City WWTP
NC0026441
Raleigh
Cheng Zhang
Chris McCorquodale
5/15/2018
Cape Fear River Basin
C
Check all that apply
PW, please:
section below if you deem
POC in LTMP/STMP
office, regional office, and
office, regional office, and
(Note effective date
bottom of this form)
staff in central office and
it to the respective SharePoint
Permit)
up)
(coming up)
- Notify PT in comment
necessary to keep a specific
- Email PT staff in central
Facility: draft permit package.
- Email PT staff in central
Facility: final permit package.
and 180 days after at the
- Email this form to PT
regional office and add
PT Town Folder (04. PT_Towns>
NCOOXXXXX>NPDES
- PQL review note (coming
- Notification about DMRs
Permit Writer
municipal renewal
Facility Name
new industries
Permit Number
WWTP expansion
X
Region
Speculative limits
X
Regional PT Staff
stream reclass.
Facility PT Staff
outfall relocation
IWS approval date
7Q10 change
Basin
other
Stream Class
other
PT staff central office contact: Kristin Litzenberger
Comments from NPDES pw to PT staff (Central, RO,
to
Facility):
has two non -categorical SlUs: Montaire Farms, authrorized
MGD, and Brookwood Farms, Inc., authorized to discharge
Please keep all the current POCs in LTMP, and ensure the
addresses the comments in the POC table.
Facility Summary and NPDES regulatory action:
2018
a design
Loves
6.0 MGD,
within
The Facility
dishcarge 1.25
0.035 MGD.
STMP update
The Town applied for NPDES permit renewal for Siler City WWTP in November
then applied for a modification for expansion in April 2021. The WWTP has
capacity of 4.0 MGD and is currently authorized to discharge 4.0 MGD into
Creek, a class C and 0.25 7Q10 flow stream. The proposed expansion is to
and 7Q10 has been updated to 0.09 The Facility serves about 8225 customers
Status
of Pretreatment Program
1) facility has no SIU's, does have
2) facility has no SIU's, does not have
3) facility has SlUs and DWQ approved
3a) Full Program with LTMP
3b) Modified Program with STMP
4) additional conditions regarding
(check all that apply)
Division approved Pretreatment Program that is INACTIVE
Division approved Pretreatment Program
Pretreatment Program (list "DEV" if program still under development)
Pretreatment attached or listed below
Permitted
Last
Reported
i ime
period for
last
reported
Actual
i ime
period
for
actual
L/STMP, approval
date:
LTMP, 05/06/2016
Industrial Flow, MGD
1.28
0.014
2016
2016
Most recent:
5/6/2016
Uncontrollable Flow, MGD
NA
1.705
11/10/2016
2016
Next Cycle:
5/5/2021
PW: Find S/LTMP document for next section.
POC in LTMP/
STMP
Parameter of
Concern (POC)
Check List
POC due to
New effluent
limit or
monitoring in
NPDES permit
POC due to
previous
NPDES/ Non-
Disch Permit
Limit or
monitoring
Required by
EPA*
Required
by 503
Sludge**
POC due
to SIU***
POTW
POC
(Explain
below)***
STMP
Effluent
Freq
LTMP
Effluent
Freq
PQLs review
From LTMP, mg/L
Comments
X
BOD
X
X
M
X
TSS
X
X
M
2.5
X
NH3
X
X
M
0.1
X
Arsenic
X
M
0.010
X
Cadmium*
X
X
M
0.002
X
Chromium*
X
X
M
0.005
X
Copper*
X
X
X
M
0.002
X
Lead*
X
X
M
0.010
X
Mercury
X
X
M
1 ng/I
Effluent only
X
Molybdenum
M
0.005
X
Nickel*
X
X
M
0.010
X
Selenium
X
M
0.010
X
Zinc*
X
X
X
M
0.010
X
Oil & Grease
X
M
5.0
X
TN
X
M
0.010
X
TP
X
M
0.002
X
Chloride
X
0.010
X
%Solids
X
M
X
Sludge to disposal flow
X
M
Footnotes:
*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
Updated by pw
POCs that need to be added to STMP
Is all data required on STMP on DMRs?
Yes
1
No
26641 NPDES_PT POCs review
Revised: July 24, 2007

i
NPDES PERMIT WRITER (PW) COMPLETES when issuing NPDES permit:
26641 NPDES_PT POCs review
Revised: July 24, 2007

NPDES Permit Public Notice Date:
Effective date:
180 days after effective (date):
CENTRAL OFFICE PRETREATMENT STAFF COMPLETES THIS PART:
Comments from PT central to NPDES pw, PT staff Facility, and PT staff region ((ex., explanation of any POCs; info you have on IU related investigations into
NPDES problems)::
HWAs/AT and STMP needs to be updated by permittee 180 days after the effective date. One IUP has a copper limit of 0.2 mg/I (MAHL for copper will go from 1.11
lb/day to 0.67 lb/day) - No overallocation expected.
Is all data required on STMP in spreadsheets with HWA/AT submittal?
Yes
No
1
REGIONAL OFFICE PRETREATMENT STAFF COMPLETES THIS PART:
Comments from PT RO Staff to NPDES pw, PT staff Facility, and PT staff central (ex. issues noted missed above, updates on the actions required
above
26641 NPDES_PT POCs review
Revised: July 24, 2007

Perlmutter, Gary
From: Hill, David A
Sent: Thursday, July 29, 2021 7:08 AM
To: Perlmutter, Gary
Subject: Fw: USGS response to DWR USGS Low Flows request # 2021-129 (dated 2021/06/30)
for Loves Creek Chatham County...RE: [EXTERNAL] Low -flow request approval
Hi Gary,
Here's the updated flow stats for Siler City.
David Hill
Environmental Specialist II
Industrial Permitting Unit
**Email preferred during this time*
NC DEQ / Division of Water Resources / Water Quality Permitting Section
NPDES Industrial Permitting Unit
919 707 3612 office
919 707 9000 main office
[e-mail]
Physical Address: 512 North Salisbury St.,Raleigh, NC, 27604
Mailing Address: 1617 Mail Service Center, Raleigh, NC, 27699-1617
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.
From: Weaver, John C <[e-mail]>
Sent: Wednesday, July 28, 2021 5:02 PM
To: [e-mail] <[e-mail]>
Cc: Hill, David A <[e-mail]>; Kebede, Adugna <[e-mail]>; Montebello, Michael J
<[e-mail]>; Albertin, Klaus P <[e-mail]>; Weaver, John C
<[e-mail]>
Subject: USGS response to DWR USGS Low Flows request # 2021-129 (dated 2021/06/30) for Loves Creek Chatham
County...RE: [EXTERNAL] Low -flow request approval
CAUTION: External email. Do not click links or open attachments unless you verify. Send all suspicious email as an attachment to
Report Spam.
David,
Note: This is part 2 of 2 of a response to two low -flow requests for this part of the Rocky River basin simultaneously
received from this requestor.
In response to your inquiry about the low -flow characteristics for a location on Loves Creek near Siler City in western
Chatham County, the following information is provided:
A check of the low -flow files here at the USGS South Atlantic Water Science Center (SAWSC, Raleigh office) indicates
low -flow estimates previously determined upstream and downstream of the point of interest, identified by the lat/long
i

coordinates (35.729647, -79.428065) provided via email dated 06/30/2021 from the DWR USGS Low Flow portal
following your request submission. Completed in 1963 and 1989, the low -flow characteristics were estimated based on
transfer of flow characteristics (by drainage -area proration) from nearby index sites in vicinity of the point of interest.
No USGS discharge records are known to exist for the point of interest.
In the absence of site -specific discharge records sufficient for a low -flow analysis, estimates of low -flow characteristics at
ungaged locations are determined by assessing a range in the low -flow yields (expressed as flow per square
mile drainage area, or cfsm) at nearby sites where estimates have previously been determined.
A basin delineation completed using the online USGS StreamStats application for North Carolina
(https://streamstats.usgs.gov/ss/) indicates the drainage area for the point of interest (StreamStats adjusted
coordinates 35.72961, -79.42806 NAD83) is 8.19 sqmi.
For streams in Chatham County, low -flow characteristics published by the USGS are provided in the
following reports:
(1) The first is a statewide report completed in the early 1990's. It is USGS Water -Supply Paper 2403, "Low -flow
characteristics of streams in North Carolina" (Giese and Mason, 1993). An online version of the report is available
at http://pubs.usgs.gov/wsp/2403/report.pdf. The report provides the low -flow characteristics (based on data
through 1988) via regional relations and at -site values for sites with drainage basins between 1 and 400 sqmi and
not considered or known to be affected by regulation and/or diversions.
(2) The second is a basin -wide report for the Cape Fear River basin published in 2001. It is USGS Water -Resources
Investigations Report 01-4094, "Low -flow characteristics and discharge profiles for selected streams in the Cape
Fear River Basin, North Carolina, through 1998 " (Weaver and Pope, 2001). An online version of the report is
available through http://nc.water.usgs.gov/reports/wri014094/. The report provides the low -flow characteristics
(based on data through 1998) for continuous -record gaging stations and partial -record sites within the Cape Fear
River basin. The report also provides low -flow discharge profiles (7Q10, 30Q2, winter 7Q10, and 7Q2) for the Cape
Fear River and selected tributaries within the basin.
(3) The third is a statewide report published in March 2015. It is USGS Scientific Investigations Report 2015-5001,
"Low -flow characteristics and flow -duration statistics for selected USGS continuous -record streamgaging stations in
North Carolina through 2012" (Weaver, 2015). The report is available online at
http://pubs.usgs.gov/sir/2015/5001/. The report provides updated low -flow characteristics and flow -duration
statistics for 266 active (as of 2012 water year) and discontinued streamgages across the state where a minimum of
10 climatic years discharge records were available for flow analyses.
Low -flow characteristics estimated for point of interest:
Inspection of the latter two reports indicates the presence of six (6) nearby selected USGS partial -record sites
(4) and continuous -record streamgages (2) in the general vicinity of the point of interest where low -flow
characteristics were published. Added to this group of index sites are provisional low -flow characteristics
(newly determined for this analysis) for the nearby active continuous -record streamgage on the Rocky River at
U.S. Highway 64 near Siler City (station id 02101726, drainage area 68.7 sqmi, POR continuous since February
2009). Among these 7 index sites, the low -flow discharge yields for the indicated flow statistics are as follows:
Annual 7Q10 low -flow yields ==> from 0 to 0.011 cfsm (average about 0.0044 cfsm, median about 0.004 cfsm) (zero
flow at 2 of 7 index sites)
2

Annual 30Q2 low -flow yields ==> from 0 to 0.089 cfsm (average about 0.039 cfsm, median about 0.044 cfsm) (zero
flow at 1 of 7 index sites)
Winter 7Q10 low -flow yields ==> from 0 to 0.066 cfsm (average about 0.028 cfsm, median about 0.031 cfsm) (zero
flow at 1 of 7 index sites)
Annual 7Q2 low -flow yields ==> from 0 to 0.044 cfsm (average about 0.022 cfsm, median about 0.027 cfsm) (zero
flow at 1 of 7 index sites)
Average annual discharge yields ==> from 0.85 to 1.2 cfsm (average about 0.95 cfsm, median about 0.9 cfsm)
Application of the above range in yields to the drainage area (8.19 sqmi) for the point of interest results in the
following estimated low -flow discharges:
Annual 7Q10 low -flow discharges ==> from 0 to 0.09 cfs (average about 0.036 cfs, median about 0.033 cfs)
Annual 30Q2 low -flow discharges ==> from 0 to 0.73 cfs (average about 0.32 cfs, median about 0.36 cfs)
Winter 7Q10 low -flow discharges ==> from 0 to 0.54 cfs (average about 0.23 cfs, median about 0.25 cfs)
Annual 7Q2 low -flow discharges ==> from 0 to 0.36 cfs (average about 0.18 cfs, median about 0.22 cfs)
Average annual discharge discharges ==> from 7 to 9.8 cfs (average about 7.8 cfs, median about 7.4 cfs)
Please note:
(1) The estimated flows are provided in units of cubic feet per second (cfs).
(2) The low -flow yields provided above are rounded to 2 significant figures. Estimated low -flow discharges less
than 1 cfs are rounded to 2 significant figures. If between 1 and 100 cfs, then rounded to 1 decimal place; if
greater than 100, then rounded to the nearest whole number (zero decimal places).
(3) The information provided in this message is based on a preliminary assessment and considered
provisional, subject to revision pending collection of future data and further analyses.
These provisional streamflow statistics are provided via the DWR USGS Low Flows cooperative agreement
between the USGS and the N.C. Department of Environmental Quality, Division of Water Resources.
Hope this information is helpful.
Thank you.
Curtis Weaver
J. Curtis Weaver, Hydrologist, PE Email; [e-mail]
USGS South Atlantic Water Science Center Online: https://www.usgs.gov/centers/sa-water
North Carolina - South Carolina - Georgia
3916 Sunset Ridge Road
Raleigh, NC 27607
Phone: [phone] // Fax: [phone]
From: Albertin, Klaus P <[e-mail]>
Sent: Wednesday, June 30, 2021 10:14 AM
To: [e-mail]
Cc: Albertin, Klaus P <[e-mail]>; Hill, David A <[e-mail]>; [e-mail];
3

Weaver, John C <[e-mail]>; Montebello, Michael J <[e-mail]>
Subject: [EXTERNAL] Low -flow request approval
This email has been received from outside of DOI - Use caution before clicking on links, opening attachments, or responding.
Your request has been approved and will be forwarded to USGS. A response from USGS usually takes 7 - 10
business days.
Request Flow Statistic Approval
Request ID: 129
Requestor: David Hill
Requestor e-mail: [e-mail]
Requestor Phone: [phone]
Local Government:
Public Water Supply:
Consultant:
Contact:
Reason: Permit
River/Stream: Loves Creek
Drainage Area (sq. mi.): 7.9
Latitude: 35.729647
Longitude: -79.428065
Other Information:
Statististics: ["7Q10","7Q10 - Winter","30Q2","Average Annual"]
Approved by: Hill, David A
4

NORTH CAROLINA 2020 INTEGRATED REPORT
Deep
AU Name
AU ID Description
'Loves Creek
13711 From US 421 to Siler City WWTP
Cape Fear River Basin
AU Number Classification AU LengthArea AU Units
17-43-10b2 C
0.2
FW Miles
2020 Draft Water Quality Assessments
PARAMETER
IR CATEGORY CRITERIA STATUS REASON FOR RATING
OW
Benthos (Nar, AL, FW)
Fish Community (Nar, AL, FW)
Water Temperature (322C, AL, LP&CP)
Dissolved Oxygen (4 mg/I, AL, FW)
pH (6 su, AL, FW)
pH (9.0, AL, FW)
Turbidity (50 NTU, AL, FW miles)
Fecal Coliform (GM 200/400, REC, FW)
Loves Creek
4307 From Siler City WWTP to Rocky River
5 Exceeding Criteria Fair, Poor or Severe Bioclassificatior
5 Exceeding Criteria Fair, Poor or Severe Bioclassificatior
1 Meeting Criteria Meeting Criteria with Statistical Con
1 Meeting Criteria Meeting Criteria with Statistical Con
1 Meeting Criteria Meeting Criteria with Statistical Con
1 Meeting Criteria Meeting Criteria with Statistical Con
1 Meeting Criteria Meeting Criteria with Statistical Con
3a Data Inconclusive Pathogen Indicator Screening Excur
17-43-10c C
0.4 FW Miles
2020 Draft Water Quality Assessments
PARAMETER
IR CATEGORY CRITERIA STATUS REASON FOR RATING
Benthos (Nar, AL, FW)
Water Temperature (322C, AL, LP&CP)
Dissolved Oxygen (4 mg/I, AL, FW)
pH (6 su, AL, FW)
pH (9.0, AL, FW)
Turbidity (50 NTU, AL, FW miles)
Fecal Coliform (GM 200/400, REC, FW)
5 Exceeding Criteria Fair, Poor or Severe Bioclassificatior
1 Meeting Criteria Meeting Criteria with Statistical Con
1 Meeting Criteria Meeting Criteria with Statistical Con
1 Meeting Criteria Meeting Criteria with Statistical Con
1 Meeting Criteria Meeting Criteria with Statistical Con
1 Meeting Criteria Meeting Criteria with Statistical Con
3a Data Inconclusive Pathogen Indicator Screening Excur
7/21/2021 NC 2020 INTEGRATED REPORT Category 5 assessments approved by EPA June 23,2021
Page 138 of 1334

AU Name
AU ID Description
NORTH CAROLINA 2020 303(D) LIST
Deep Cape Fear River Basin
AU Number Classification Length or Area Units
'Loves Creek 17-43-10b1 C 2.3
13505 From Chatham Avenue to US 421
PARAMETER IR CATEGORY CRITERIA STATUS REASON FOR RATING 303D YEAR
FW Miles
Dissolved Oxygen (4 mg/I, AL, FW)
Loves Creek
'5 lExceeding Criteria Legacy RAMS Assessments 2012
13711 From US 421 to Siler City WWTP
PARAMETER
Benthos (Nar, AL, FW)
Fish Community (Nar, AL, FW)
17-43-10b2 C 0.2 FW Miles
IR CATEGORY CRITERIA STATUS REASON FOR RATING 303D YEAR
5 Exceeding Criteria Fair, Poor or Severe Bioclassification 1998
5 Exceeding Criteria 1Fair, Poor or Severe Bioclassification 2020
Loves Creek 17-43-10c
4307 From Siler City WWTP to Rocky River
C 0.4 FW Miles
PARAMETER
IR CATEGORY CRITERIA STATUS REASON FOR RATING 303D YEAR
Benthos (Nar, AL, FW)
Tick Creek
4312 From source to US 421
PARAMETER
Fish Community (Nar, AL, FW)
5 Exceeding Criteria Fair, Poor or Severe Bioclassification 1998
IR CATEGORY
1'5
17-43-13a C 8.2 FW Miles
CRITERIA STATUS MI REASON FOR RATING 303D YEAR
Exceeding Criteria Fair, Poor or Severe Bioclassification 2006
Tick Creek
4313 From US 421 to Rocky River
17-43-13b C 4.9 FW Miles
PARAMETER
IR CATEGORY CRITERIA STATUS REASON FOR RATING 303D YEAR
Benthos (Nar, AL, FW)
5 Exceeding Criteria
Fair, Poor or Severe Bioclassification 2020
Harlands Creek(Hollands Creek) 17-43-15
4316'
From source to Rocky River
IR CATEGORY CRITERIA STATUS REASON FOR RATING 303D YEAR
5 Exceeding Criteria _ Fair, Poor or Severe Bioclassification 2020
PARAMETER
1Benthos (Nar, AL, FW)
10.2 FW Miles
Bear Creek I17-43-16b C
4318 From SR 2189 to SR 2187
PARAMETER IR CATEGORY CRITERIA STATUS REASON FOR RATING 303D YEAR
Benthos (Nar, AL, FW) 5 Exceeding Criteria Fair, Poor or Severe Bioclassification 2010
2.0 FW Miles
7/21/2021 NC 2020 303d List- Approved by EPA June 23,2021
Page 16 of 188

5/7/2021 NCDEQ-DWR :: Benthos Site Details
NC Division of Water Resources
•
di Ili
Benthos Site Details
Waterbody Location Station ID Date I Bioclassification
LOVES CR NR US 64 BB174 24 Jun 2003 Fair
County 8 digit HUC Latitude Longitude Elevation (ft)
Chatham 03030003 35.730560 -79.426110 499
Level IV Ecoregion
Carolina Slate Belt
Drainage Area (mi2) Stream Width (m) Stream Depth (m)
8.2 6.0 0.3
Upstream NPDES Dischargers (>1 MGD or <1 MGD and within 1 mile)
Landuse (%)
Forest
Developed
NPDES Number
Impervious Cultivation Grass/Herb/Shrub
Water Quality Parameters 2003 1997 1989
Temperature (°C) 23.0 26.0 0.0
Dissolved Oxygen(mg/L) 8.5 6.0 0.0
Specific Conductance (pS/cm) 570 490 0
pH (s.u.) 7.6 7.2 0.0
Habitat Assessment Scores (max score)
Volume (MGD)
Wetland Water Barren
so\''
�1
v•,4
SNixo
Substrate (%) Boulder (35), Cobble (35), Gravel (20), Sand (10), Silt (0) Water Clarity Slightly Turbid
Sample Date Sample ID Method ST
24 Jun 2003 9164 Full Scale 40
27 Jun 1997 7309 Full Scale 36
01 Aug 1989 5004 Full Scale 27
EPT
6
4
2
Print Page
BI EPT BI
6.82 6.96
7.45 6.35
8.33 6.92
Bioclassification
Fair
Poor
Poor
https://www.ncwater.org/?page=672&SitelD=BB174 1/1

Siler City WWTP
Effluent Monitoring NC0026441
5.0
4.5
4.0
3.5
3.0
C7 2.5
2 2.0
1.5
1.0
0.5
0.0
Flow
• Mo Avg Limit
•
•••
•
• • ••• • ••• • •• •
•• •• •••••
•
• •••
•
• •••
oti� oti� oti� oti� oti° oti° otiti otiti oti� 61'
°\���ti �\�h�ti y�\ti�ti o\y��ti \I>, ��ti
50
45
40
35
30
own 25
20
120%
100%
80%
60%
40%
20%
0%
BOD Removal
• % Removal —Limit
Wet -.. 4-vir - e►I�"��1
• •
•
•
O�� O,� OHO O,� Off° O�y
o�ti°\� o\��\ti ��ti�\� titi�y\� �o�ti�\� ti\�\� A\��\�
Summary Statistics
N 1444
Avg 2.790
SD 1.095
Min 0.863
Max 10.894
Summary Statistics
Summer
N 270
Avg 4.2
SD 4.2
Min 2.0
Max 31.0
Winter
N 195
Avg 5.7
SD 9.5
Min 2
Max 76.9
Summary Statistics
N 465
Avg 0.975
SD 0.044
Min 0.413
Max 0.995
Page 1 of 6 GB Perlmutter 3/23/2022

Siler City WWTP
Effluent Monitoring NC0026441
E
120
100
80
60
40
20
0
• Wk Avg
Total Suspended Solids (TSS)
• Mo Avg
otio ON'
otio' otio otio oti°
o\C\t . o\�\ti h\' ' N'1 o\y��ti
Wk Limit -
MA Limit
01> 01> 011' 011'
150.0%
100.0%
50.0%
0.0%
-50.0%
• -100.0%
- 150.0%
- 200.0%
-250.0%
-300.0%
-350.0%
TSS Removal
00 co rn m 0
%-1 c-I ci ,--I N
0 0 0 0 0
N N N N N
'-N c-I -
cr 0 Ln c-I LO
N
0
N
N
0
N
CA
N
n
N
N
0
N
00
N
•
N
N
0
N
n
N
00
PnrDI Cnlifnrm
Summary Statistics
N
Avg
SD
Min
Max
468
3.7
9.9
1.7
206.0
Summary Statistics
N
Avg
SD
Min
Max
443
0.963
0.184
-2.815
0.998
Summary Statistics
N
Avg
SD
Min
Max
N
Avg
SD
Min
Max
Summer
606
1.7
3.6
0.5
27.0
Winter
411
3.1
6.2
0.5
34
Page 2 of 6 GB Perlmutter 3/23/2022

Siler City WWTP Effluent Monitoring NC0026441
Geomean, cfu/100 mL
10,000
1,000
100
10 • •
• ••
1 •• • '
Wk Avg
I Cl.Q1 1.V III VI III
• Mo Avg Wk Limit - - - MA Limit
•
•
-----t ---
- - -
•
•
•
r--
.•,• 6eat tilt; • ii,
iil
• 11* • • ,AS • • ' a
•
r
ON' oti oti�' oti° oti�' oti° otiti otiti oti� oti�
pH
Summary Statistics
N 418
Geomean 11
Min 1
Max 80,000
Summary Statistics
N 994
Avg 21.2
SD 5.7
Min 10.0
Max 31.0
Summary Statistics
N 994
Avg 8.6
SD 1.2
Min 6.1
Max 12.0
Page 3 of 6 GB Perlmutter 3/23/2022

Siler City WWTP Effluent Monitoring NC0026441
J
E
10
9
8
7
5
4
3
2
1
0
• Effluent L. Limit U. Limit
vrwityPesavirimiramoisvimot
oti ON' oti' ON' oti° oti° 01> 01> oti' oti'
°�vti ° �\�ti yo��ti �\yh\ti y'ti�ti °\���ti N,\ �\��ti '1, �\�\ti
—TKN
45
40
35
30
25
E 20
15
10
5
0
Nitrogen
NO2+NO3 —TN
/,,
' oti° oti° oti° 61> 61> oti oti
��ti
�\y��ti y�\ti�ti
Total Phosphorus (TP)
• Qtr Avg QA Limit
Summary Statistics
N 994
Avg 7.4
SD 0.2
Min 6.7
Max 8.1
Summa Statistics
N 305
Avg 11.4
SD 7.5
Min 1.1
Max 39.0
NO2+NO3
N 305
Avg 8.1
SD 7.7
Min 0.2
Max 33
TKN
N 305
Avg 3.4
SD 4.7
Min 0.2
Max 25.4
Summary Statistics
N 33
Avg 9,419
SD 5,647
Min 1,521
Max 22,264
Summary Statistics
Summer
Page 4 of 6 GB Perlmutter 3/23/2022

Siler City WWTP Effluent Monitoring
NC0026441
2.5
2.0
1.5
1.0
0.5
0.0
•' • • 1 • • 1 •
,r _
•
ON ON ON ON
ON ON
ono otiti 01' 01' 01'
35
30
25
\ 20
ao
15
10
5
0
Total Zinc (Zn)
Ain/
oti� oti�' oti�' oti�' otio oti° otiti otiti oti� oti�
o\�ti t. y\' ' yo\, \ti \ )\ N1' � o\y4�ti �\��ti 1' '1 (1,1' ti
Chloride
250 r
N 125
Avg 0.17
SD 0.27
Min 0.04
Max 1.30
Winter
N 88
Avg 0.19
SD 0.35
Min 0.02
Max 1.90
Summary Statistics
N 17
Avg 8
SD 3
Min 4
Max 16
Summary Statistics
N 18
Avg 20
SD 7
Min 10
Max 31
Page 5 of 6 GB Perlmutter 3/23/2022

Effluent Monitoring NCOO26441
Siler City WWTP
200
J 150
be
100
50
0
Summary Statistics
N 16
Avg 109
SD 56
Min 28
Max 212
Page 6 of 6 GB Perlmutter 3/23/2022

Siler City WWTP DMR Comments NC0026441
Mar 2020 - Week #5 NH3-N = 11.5 mg/I Making us over our weekly limit of 6 mg/I. Also over our
monthly limit of 2 mg/I @ 2.81 mg/I. It is my belief that this happened due to a few high flow events in
the month of March and the fact that we are holding onto more sludge due to not being able to land
apply during these wet months. We had no available storage to waste and in result had to turn off the
blowers to our Oxidation ditches several times during the month to prevent from having a Clarifier bulk.
We have since had Synagro here to press out sludge. Giving us available space to waste.
3/30/2020 - BOD - GGA > 228.5 mg/I due to a dirty probe.
Apr 2020 - Week #1 NH3-N = 5.7 mg/I Week #2 NH3-N = 8.8 mg/I Putting us over our weekly limit of 3.0
mg/I and our monthly limit of 1.0 m/I @ 2.5 mg/I. It is my belief that this is due to high flow events in the
month of April, also due to the fact that we are still holding onto more sludge then average due to not
being able to land apply as frequently due to wet weather leaving us with no available storage to waste.
In result having to turn off blowers to our Oxidation ditch's a few times a month to prevent from having
a Clarifier bulk due to high sludge blankets.
4/7/20 BOD = 8.1 mg/I 4/9/20 BOD= 8.3 mg/I putting us over our weekly BOD limit of 7.5 mg/I GGA = >
228.5 mg/I Results could have been affected from dirty probe. Cleaned probe and replaced membrane.
May 2020 - Week #4 BOD = 10 mg/I putting us over our limit of 7.5 mg/I
Monthly BOD = 5.5 mg/I putting us over our monthly limit of 5.0 mg/I
Week # 5 NH3-N = 3.8 mg/I over our weekly limit of 3.0 mg/I
NH3-N monthly = 1.4 putting us over our monthly limit of 1.0 mg/I
After making corrections of Fecal week #4 we were over our weekly limit of 400 with a reported amount
of 5,280
Since we were experiencing these issues: on 6/17/2020, we consulted with Kin Ferrall from Maryland
Biochemical (our bug consultant) about our treatment process and the condition of our plant. We went
over lab results and sludge characteristics for the past couple of months. Based on this information it
was his assumption that we could have had a high load of carbon source in the plant potentially bound
up in the return sludge, causing our plant process to not be as efficient. We increased our wasting in
hopes of removing the high carbon sludge. We also investigated outside sources. However, around 6/21
- 6/22 the plant seemed to be slowly recovering from the upset. The plant began to return back to
normal results. It is believed this high carbon load could have been a contributing factor for the past few
violations.
Jun 2020 - The following parameters exceed limit value:
BOD, 5-Day weekly limit value = 7.5 Week 1 reported value = 16.1, Week 2 reported value = 14.4, Week
4 reported value = 9.5, Week 5 reported value = 13.1
BOD 5-Day Monthly limit value = 5.0 Monthly reported value = 11.5
NH3-N Weekly limit value = 3.0 Week 1 reported value= 7.7, Week 2 reported value = 6.5, Week 4
reported value = 3.6
NH3-N Monthly limit = 1.0 Monthly reported value= 4.8

Siler City WWTP DMR Comments NC0026441
It is believed that these parameters exceeded limit value due to the continuous situation that we have
been experiencing for the past few months. A combination of issues could be to blame, to include high
flow events, holding onto sludge longer due to not being able to land apply during the wet season, and a
potential high load of carbon interfering with our treatment process. We have still been working closely
with Synagro and wasting as much as our storage allows us to. The plant seems to be getting closer to
more consistent numbers. Moving into the month of July sampling results show great improvement. We
will continue to closely monitor plant process and do what we can to produce quality Effluent.
Jul 2020 - The following parameters exceeded limit value:
Week #1
BOD, 5-Day weekly limit value = 7.5 mg/I Reported value = 8.5 mg/I
NH3-N weekly limit value = 3 mg/I Reported limit = 6.95 mg/I
These parameters were exceeded due to the continuous conditions we have been experiencing the past
few months. We were unable to waste due to sludge storage being full. Synagro has been unable to land
apply due to field conditions being to wet. Synagro was able to come and hauled 900,000 gallons at the
beginning of July allowing us the ability to waste.
Jan 2021
Exceeded the following parameters:
- BOD - Weekly Limit = 15 mg/I Reported week 4 = 43.25 mg/I
Monthly Limit = 10 Reported = 17.13 mg/I
- NH3 as N - Weekly Limit = 6 mg/I Reported week 2 = 10.38 mg/I
Reported week 4 = 12.425 mg/I
Reported week 5 = 26.86 mg/I
Reported week 6 = 28.1 mg/I
Monthly Limit = 2 mg/I Reported = 14.35 mg/I
- TSS - Weekly Limit = 45 Reported week 4 = 105.4 mg/I
- Fecal Coliform - Weekly limit = 400 Reported week 5 = 2420
It is believed we exceeded these parameters due to maintenance to the Tertiary filters and blowers to
the Oxidation ditches. During the process of this maintenance to the blowers we were not able to
provide the proper amount of air to biologically treat the oxidation ditches. Also, the filters had to be
taken completely offline for the maintenance to be completed. Blowers and Filters are back online
therefore sampling results are expected to improve. This maintenance was due to equipment failure not
general maintenance.

Dissolved Oxygen (mg/L)
Start Date LC -Up Effluent
2017-11-29 9 9.9
2017-12-15 10.5 10.5
2018-01-23 9.4 12
2018-02-26 7.5 10.5
2018-03-13 10.4 10.8
2018-04-30 9.2 8.6
2018-05-09 6.9 8.3
2018-05-25 7.6 9.3
2018-06-06 7.5 7
2018-06-29 6.3 7
2018-07-17 6 7.3
2018-07-30 6.9 7.7
2018-08-15 6.5 7.5
2018-08-28 7.3 7.5
2018-09-20 7.4 7.7
2018-10-10 6.8 7.3
2018-11-26 10.8 9.3
2018-12-18 11.3 8.6
2019-01-22 11.3 8.8
2019-02-13 11.9 9.4
2019-03-26 10.2 8.7
2019-04-22 9.4 8.6
2019-05-13 8.3 7.8
2019-05-30 7 7.1
2019-06-11 7.7 7.3
2019-06-21 7.9 7.9
2019-07-19 5.1 7.2
2019-07-29 7.1 7.8
2019-08-14 6.8 7.1
2019-08-27 7.2 7.9
2019-09-16 6.3 7.3
2019-09-30 7.6 9
2019-10-22 7.6 7
2019-11-14 10.9 8.7
2019-12-10 10.7 9.1
2020-01-28 11 10.1
2020-02-24 11.3 10.2
2020-03-30 9.4 9.1
2020-04-30 9.2 8.6
2020-05-12 9.1 8.9
2020-05-27 8.3 9.1
2020-06-17 8.6 7.9
2020-06-30 7.1 7.4
2020-07-20 6.77 7.3
2020-07-31 7.08 7.4
LC-Dn
9.9
11.2
10.2
9.5
11.4
9.2
8.5
8
7.7
7.3
7.4
7
7.5
7.4
7.5
7.4
11.2
11.7
13.3
11.9
10.2
9.2
8.2
7.2
8.2
7.5
6.9
7.3
7.1
7.4
7.2
7.2
8.5
10.1
10.9
11.2
11
8.6
9.3
9
7.8
8.3
5.4
6.96
7.83
RR-UIIIIIIMILd
9.7 10.4 5.0
5.0
5.0
5.0
11.2 11.4 5.0
10.2 10.5
11.3 9.8
8.6 5.5
8.7 8 5.0
6.4 6.3 5.0
6.9 6.8
5.0
5.0
5.0
5.0
4.1 5.1 5.0
6.9 6.4
4.1 5.9
4.3 5
6.9 6.2 5.0
3.3 5 5.0
5.0
5.0
10.5 5.0
1 1.9 5.0
12.6 5.0
11 5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
4.6 5.5 5.0
5.0
5.0
5.0
1 1.7 5.0
10.5 5.0
1 1.2 5.0
5.0
5.0
5.0
7.7 7.3 5.0
7.1 6.9
5.8 6.1
11.4
11.8
10.3
10.9
10 9.8
8.8 8.7
7.8 7.1
5.5 6.8
8.1 7
6.7 6.5
5 7.4
7.1 6.9
6.1 6.7
7.2 6.4
3.2 5.2
7.2 7.6
9.8 10.9
10.9
10.7
11.1
9.4 7.8
9.3 9.1
8.3 8.8
8.2 8.1 5.0
5.9 6.61 5.0
6.98 6.85 5.0
6.54 6.49 5.0

2020-08-06 7.19 7.5 6.73 7.16 6.56 5.0
2020-08-31 6.83 7.5 7.49 4.01 6.63 5.0
2020-09-15 7.19 7.6 7.42 5.91 5.27 5.0
2020-09-29 7.43 7.4 7.89 7.79 6.61 5.0
2020-10-26 8.4 8.6 8.7 7.2 6.5 5.0
2020-11-10 8.6 8.7 8.9 7.7 7 5.0
2020-12-08 11.2 10.4 10.3 10.5 10.4 5.0
N
Avg
SD
Min
Max
52 52 52 52 52
8.37 8.41 8.68 7.74 7.83
1.71 1.18 1.68 2.32 2.11
5.1 7 5.4 3.2 5
11.9 12 13.3 11.8 12.6
Anova: Single Factor
SUMMARY
Groups Count Sum Average Variance
LC -Up 52 434.99 8.365192 2.919614
Effluent 52 437.2 8.407692 1.398763
LC-Dn 52 451.12 8.675385 2.83201
RR -Up 52 402.29 7.736346 5.368337
RR-Dn 52 407.21 7.830962 4.453966
ANOVA
irce of Variat SS df MS F P-value F crit F crit
Between Grc 33.67161 4 8.417901 2.479837 0.044499 2.407043 2.409257
Within Grou 865.6072 255 3.394538
Total 899.2788 259

Conclusion: average DO is not different among instream stations and effluent.
t-Test: Two -Sample Assuming Unequal Variances
LC -Up LC-Dn
Mean 8.365192 8.675385
Variance 2.919614 2.83201
Observations 52 52
Hypothesized Mean Difference 0
df 102
t Stat -0.93269
P(T<=t) one -tail 0.176591
t Critical one -tail 1.65993
P(T<=t) two -tail 0.353182
t Critical two -tail 1.983495

Temperature (°C
Start Date LC -Up Effluent LC-Dn
2017-11-29 8.2 15 14.2
2017-12-15 5.3 12 10.5
2018-01-23 12.4 13 12.1
2018-02-26 15.9 16 16.1
2018-03-13 5.4 12 7.6
2018-04-30 14.2 17 16.4
2018-05-09 17.6 21 20.1
2018-05-25 22 23 22.4
2018-06-06 21.3 25 23.3
2018-06-29 24 27 26.7
2018-07-17 24 28 27.5
2018-07-30 24.5 28 25.2
2018-08-15 23.9 26 26.2
2018-08-28 24.1 25 26.6
2018-09-20 23.6 24 24.1
2018-10-10 22.3 26 24.5
2018-11-26 11.1 15 11.7
2018-12-18 7.9 12 9.4
2019-01-22 3.3 11 5.9
2019-02-13 9.5 13 10.6
2019-03-26 13 16 13.8
2019-04-22 15.3 19 16.4
2019-05-13 20.4 23 21.8
2019-05-30 24.4 26 26.8
2019-06-11 22.8 25 24.3
2019-06-21 23.6 27 25.6
2019-07-19 25.7 30 29.5
2019-07-29 24.4 29 28.5
2019-08-14 25.2 28 27.8
2019-08-27 21.9 27 26
2019-09-16 23.7 28 27.5
2019-09-30 26.7 28 23.5
2019-10-22 17.3 23 21.6
2019-11-14 6.6 17 13.8
2019-12-10 11.6 18 17
2020-01-28 8.7 15 11.8
2020-02-24 9.4 15 11.9
2020-03-30 19.2 20 19.8
2020-04-30 15.8 21 16.7
2020-05-12 13.1 21 19.2
2020-05-27 20.4 22 20.3
2020-06-17 17.8 22 19.5
2020-06-30 24.2 27 26.7
2020-07-20 26.8 30 29.1
2020-07-31 26 30 28.6
2020-08-06 25.4 29 28.1
R RR-Dn
8.2 7.6
4.9 4.4
6.2
11
15.1
7.8
17.8
21.9
25.5
16
7.6
16
20.51
23.6
26.6
24
27.6
25.6
29
27
26.1
26.1
27.3
26.1
26.6
25.8
25.8
23.7
23.6
23.2
9
10.1
6.8
7.4
5.6
4.8
9.5
9.4
13.2
13
18
17
22.3
21.6
27.3
26.9
26.3
24.1
26.9
25.6
30.5
28.5
28.2
26.4
29.6
27.8
23.1
22.9
27.5
25.6
25.4
24.6
16.9
17.1
9
8.2
10.2
11.2
9
9.6
9.4
9.4
19.6
19.5
17.4
16.8
17.6
16.9
21.9
20.9
21
19
26.8
30.8
29.3
28.8
26.7
29.7
28.6
27.5
Loves Cr Rocky R
Standard Dn-Up Dn-Up
32.0 6.0 -0.6
32.0 5.2 -0.5
32.0 -0.3 4.8
32.0 0.2 0.9
32.0 2.2 -0.2
32.0 2.2 -1.8
32.0 2.5 -1.4
32.0 0.4 -1.9
32.0 2.0 -2.6
32.0 2.7 -2
32.0 3.5 -2
32.0 0.7 0
32.0 2.3 -1.2
32.0 2.5 -0.8
32.0 0.5 -2.1
32.0 2.2 -0.4
32.0 0.6 1.1
32.0 1.5 0.6
32.0 2.6 -0.8
32.0 1.1 -0.1
32.0 0.8 -0.2
32.0 1.1 -1
32.0 1.4 -0.7
32.0 2.4 -0.4
32.0 1.5 -2.2
32.0 2.0 -1.3
32.0 3.8 -2
32.0 4.1 -1.8
32.0 2.6 -1.8
32.0 4.1 -0.2
32.0 3.8 -1.9
32.0 -3.2 -0.8
32.0 4.3 0.2
32.0 7.2 -0.8
32.0 5.4 1
32.0 3.1 0.6
32.0 2.5 0
32.0 0.6 -0.1
32.0 0.9 -0.6
32.0 6.1 -0.7
32.0 -0.1 -1
32.0 1.7 -2
32.0 2.5 -0.1
32.0 2.3 -1.1
32.0 2.6 -0.7
32.0 2.7 -1.3

2020-08-31 24.4 28 27.7 27.1 27.3 32.0 3.3 0.2
2020-09-15 21 28 25.7 24.9 24 32.0 4.7 -0.9
2020-09-29 21 25 23.9 21.9 21.9 32.0 2.9 0
2020-10-26 16.4 22 20.6 17.9 18 32.0 4.2 0.1
2020-11-10 16.8 22 21.2 16.8 16 32.0 4.4 -0.8
2020-12-08 6.9 16 11.2 8.8 8.3 32.0 4.3 -0.5
N
Avg
SD
Min
Max
52 52 52 52 52
18.0 22.0 20.5 19.9 19.2
6.8 5.8 6.6 8.1 7.5
3.3 11 5.9 4.9 4.4
26.8 30 29.5 30.8 29.7
52 52
2.5 -0.7
1.9 1.2
-3.2 -2.6
7.2 4.8
No. increases > 2.8° C
18 1
Temperature
O LC -Up • Effluent • LC-Dn A RR -Up ♦ RR-Dn -Standard
35 -
30
25
20
15 - I I g
10 -
I
5 - QA O
0
A.�
A
sa t.
•
•
g
A A
A
Coe
• O
e
A
p t
• en
•
A
'1ti do ,y, N Oti ' . O� ti3
o°) 0 ' • 0 tiff 0 oti oA
Anova: Single Factor
SUMMARY
Groups Count Sum Average Variance
LC -Up 52 936.4 18.007692 46.37406
Effluent 52 1146 22.038462 33.37104
LC-Dn 52 1067 20.519231 43.39923
RR -Up 52 1034.3 19.890385 65.24442
RR-Dn 52 1000.5 19.240385 55.55736
ANOVA
irce of Variat. SS df MS F P-value F crit F crit
Between Grc 466.1687 4 116.54217 2.388687 0.051487 2.407043 2.409257
Within Groin 12441.25 255 48.78922
Total 12907.42 259

Conclusion: differences in average temperature were not detected among sampling sites.

Specific Conductance (µS/cm)
Start Date LC -Up LC-D
2017-11-29 254 696
2017-12-15 253 653
2018-01-23 200 395
2018-02-26 250 588
2018-03-13 129 250
2018-04-30 156 394
2018-05-09 198 640
2018-05-25 139 316
2018-06-06 163 489
2018-06-29 288 779
2018-07-17 234 747
2018-07-30 103 275
2018-08-15 183 561
2018-08-28 185 667
2018-09-20 138 213
2018-10-10 201 589
2018-11-26 128 154
2018-12-18 122 219
2019-01-22 121 243
2019-02-13 123 308
2019-03-26 98 224
2019-04-22 115 229
2019-05-13 184 600
2019-05-30 195 928
2019-06-11 133 543
2019-06-21 136 790
2019-07-19 213 1210
2019-07-29 169 1205
2019-08-14 229 846
2019-08-27 190 1043
2019-09-16 285 1142
2019-09-30 1044 355
2019-10-22 169 1010
2019-11-14 164 905
2019-12-10 220 1060
2020-01-28 123 501
2020-02-24 133 500
2020-03-30 150 643
2020-04-30 78 178
2020-05-12 188 869
2020-05-27 167 100
2020-06-17 99 309
2020-06-30 192 891
2020-07-20 151 830
2020-07-31 163 814
MI
R-Up RR-Dn
991506
96 332
124
303
97
202
91
96
77
106
85
205
87
119
84
131
105
297
104
313
80
200
84
116
89
194
53
80
75
231
72
82
69
85
81
100
86
144
75
100
67
92
83
160
88
251
86
134
94
285
123
643
114
645
89
535
86
136
113
712
121
913
92
154
109
316
99
401
77
112
75
79
88
172
71
75
85
265
66
116
60
89
72
269
76
134
83 273

2020-08-06 166 957 83 158
2020-08-31 272 956 87 167
2020-09-15 202 1011 91 370
2020-09-29 202 799 94 159
2020-10-26 231 848 105 396
2020-11-10 229 978 103 366
2020-12-08 137 460 82 126
N
Avg
SD
Min
Max
52 52 52 52
192.2 632.9 88.0 243.2
130.6 308.5 15.5 182.4
78 100 53 75
1044 1210 124 913
Anova: Single Factor
SUMMARY
Groups Count Sum Average Variance
LC -Up
LC-Dn
RR -Up
RR-Dn
52 9995 192.2115 17043.54
52 32910 632.8846 95169.44
52 4575 87.98077 238.882
52 12645 243.1731 33272.85
0 0 #DIV/0! #DIV/0!

ANOVA
Ira, of Variat SS df MS F P-value F crit
Between Grn 8846940 4 2211735 60.41235 1.54E-33 2.41613
Within Grou 7431960 203 36610.64
Total 16278900 207
Conclusion: average Conductivity differences were found among the four stations
t-Test: Two -Sample Assuming Unequal Variances
LC -Up LC-Dn
Mean 192.2115 632.8846
Variance 17043.54 95169.44
Observations 52 52
Hypothesized Mean Difference 0
df 69
t Stat -9.4863
P(T<=t) one -tail 1.96E-14
t Critical one -tail 1.667239
P(T<=t) two -tail 3.92E-14
t Critical two -tail 1.994945
Conclusion: downstream Loves Creek has higher Conductivity than has upstream Loves Creek
t-Test: Two -Sample Assuming Unequal Variances
RR -Up RR-Dn
Mean 87.98077 243.1731
Variance 238.882 33272.85
Observations 52 52
Hypothesized Mean Difference 0
df 52
t Stat -6.11327
P(T<=t) one -tail 6.37E-08
t Critical one -tail 1.674689
P(T<=t) two -tail 1.27E-07
t Critical two -tail 2.006647
Conclusion: downstream Rocky River has higher Conductivity than has upstream Rocky River.

Fecal Coliform (cfu/100 mL)
Start Date LC -Up Effluent LC-Dn RR -Up RR-Dn
2017-11-28 1
2017-11-29 5 50 105 31
2017-12-14 1
2017-12-15 6 23 48 37
2018-01-22 1
2018-01-23 7600 4000 1000 4200
2018-02-26 6800 1600 31 35
2018-02-27 1
2018-03-13 1000 1 460 420 800
2018-04-30 36 9 27 16 32
2018-05-09 114 29 37 30
2018-05-10 1
2018-06-28 14
2018-06-29 171 41 95 105
2018-07-17 510 25 152 14 49
2018-08-28 52 6 24 6 67
2018-09-20 200 171 76 105
2018-09-21 2
2018-10-10 133 8 230 86 86
2018-11-26 280 197 270 240
2018-11-27 1
2018-12-18 31 1 22 1400 800
2019-01-22 35 1 19 95 114
2019-02-13 460 1 230 105 600
2019-03-26 450 6 230 250 1000
2019-04-22 200 124 230 105
2019-04-23 8
2019-05-13 7600 53 1400 95 124
2019-06-11 1600 31 530 800 370
2019-07-17 20
2019-07-19 143 76 16 67
2019-08-14 1000 7 152 23 162
2019-09-16 37 29 152 14 95
2019-10-22 360 14 86 800 800
2019-11-14 220 20 76 610 410
2019-12-10 76 10 22 21 133
2020-01-28 162 57 1600 1400
2020-01-29 16
2020-02-24 95 6 57 76 57
2020-03-30 124 6 14 40 48
2020-04-29 8
2020-04-30 12200 8400 12600 9800
2020-05-12 9 47 10 52
2020-05-13 10
2020-06-17 2400 308 1400 1600 6400

2020-07-20 260 43 181 76 105
2020-08-05 33
2020-08-06 350 143 133 450
2020-09-15 370 114 67 95
2020-09-16 38
2020-10-26 171 28 133 124 600
2020-11-10 129 17 57 19 105
2020-12-08 220 11 105 440 280
N
Geomean
Min
Max
38 38 38 38 38
226 7 127 113 195
5 1 14 6 30
12200 308 8400 12600 9800
100000
10000
1000
100
10
°
c2
Fecal Coliform
O LC -Up ■ Effluent • LC-Dn ° RR -Up ♦ RR-Dn
iO O § A
° 0 Q;2
OSA8A•.a�c• g
A: • • maa• • b•
o • ■• ■ ■■�
■
1 MEM ■
.L'L N. tit ,. oti ,. o° 'V
o°) 0 N. 0 tiff ov 0 6�

TKN (mg/L)
Start Date LC -Up Effluent LC-Dn RR -Up RR-Dn
2017-11-28 0.2
2017-11-29 0.2 0.2 0.2 0.53
2017-12-14 0.2
2017-12-15 0.35 0.94 0.4 0.92
2018-01-22 2.7
2018-01-23 1.13 1.15 0.93 1.47
2018-02-26 0.99 0.52 0.94 1.73
2018-02-27 0.2
2018-03-13 0.51 1 0.54 0.85 0.93
2018-04-30 0.82 0.59 1.33 1.12
2018-05-02 1.5
2018-05-08 1.4
2018-05-09 0.5 0.2 1.12 1.25
2018-06-29 0.52 0.2 0.94 0.99
2018-07-03 3.3
2018-07-17 0.34 0.5 0.2 0.86 1.05
2018-08-28 1.22 1.3 0.2 1.78 1.3
2018-09-20 2.45 10.4 1.94 3.15 2.51
2018-10-08 1.8
2018-10-10 1.19 1.16 2.31 2.33
2018-11-26 1.33 1.1 1.35 1.16
2018-11-27 0.5
2018-12-18 0.47 0.5 0.36 1.13 1.11
2019-01-22 0.63 0.5 0.37 1.15 1.09
2019-02-11 1.1
2019-02-13 1.59 0.88 1.49 1.46
2019-03-26 0.52 2.2 0.72 0.84 0.75
2019-04-22 0.36 0.15 1.36 0.71
2019-04-23 2.1
2019-05-13 1.54 1.2 0.24 1.05 1.06
2019-05-28 3
2019-05-30 0.91
2019-06-11 0.55 2.7 0.2 0.78 0.87
2019-06-21 0.94
2019-07-19 0.46 0.2 0.55 1.02
2019-07-23 2
2019-07-29 3 0.72
2019-08-12 1.8
2019-08-14 0.23 1.07 0.59 1.14
2019-08-26 0.5
2019-08-27 0.87
2019-09-16 0.2 0.2 0.72 1
2019-09-30 0.67
2019-10-01 2.7
2019-10-22 0.53 0.2 0.68 0.74

2019-10-24
2019-11-12
2019-11-14
2019-12-10
2020-01-28
2020-01-29
2020-02-24
2020-03-30
2020-04-01
2020-04-29
2020-04-30
2020-05-12
2020-05-13
2020-05-27
2020-05-28
2020-06-17
2020-06-29
2020-06-30
2020-07-20
2020-07-30
2020-07-31
2020-08-05
2020-08-06
2020-08-31
2020-09-01
2020-09-15
2020-09-16
2020-09-29
2020-09-30
2020-10-26
2020-11-10
2020-12-08
0.78
0.2
0.2
2
6
0.2
1.9 0.2
0.94
0.5
1.01
0.54
0.87
0.6
0.53
0.73
0.5 0.81 0.95 1.08 1.5
0.29 7.79 1 1.28
1.16
0.57
0.39
0.95
0.55
0.53
0.42
0.44
0.42
1.4
3.2
2.5
5.3
1.2
1.8
1.2
1.5
1.5
1
1.2
1.6
0.67
1.21
1.67
3.98
0.99
1.61
0.9
1.06
1.86
1.04
0.72
1.54
1.27
0.84
8.13 0.89 0.71
1.04
1.95 1.12 2.07
0.2
0.2
1.05
0.94
0.88
0.88
1.15
0.97
0.96
1.12
N 38 46 38 48 38
Avg 0.69 1.93 1.13 1.05 1.16
SD 0.48 1.78 1.79 0.48 0.45
Min 0.20 0.20 0.15 0.20 0.53
Max 2.45 10.4 8.13 3.15 2.51

12
10
8
J
ern 6 ■
E ■
4 - ■ •
• U. •
20 teAtce tOligktela.took4614.
ti� ti6 tiA h tioti ti, o� ti�
6) 6 , 6 tiff , 6 6
Total Kjeldahl Nitrogen (TKN)
O LC -Up ■ Effluent • LC-Dn 0 RR -Up ♦ RR-Dn
■
•
•
Anova: Single Factor
SUMMARY
Groups Count Sum Average Variance
LC-U p 38 26.03 0.685 0.230166
Effluent 46 88.68 1.927826 3.176564
LC-Dn 38 42.99 1.131316 3.206758
RR -Up 48 50.3 1.047917 0.232404
RR-Dn 38 43.96 1.156842 0.204325
ANOVA
irce of Variat SS df MS F P-value F crit
Between Grc 35.77964 4 8.944911 6.29193 8.6E-05 2.41613
Within Grou 288.5946 203 1.421648
Total 324.3742 207
Conclusion: differences detected among the five sampling sites.

t-Test: Two -Sample Assuming Unequal Variances
LC -Up LC-Dn
Mean 0.685 1.131316
Variance 0.230166 3.206758
Observations 38 38
Hypothesized Mean Difference 0
df 42
t Stat -1.48405
P(T<=t) one -tail 0.072631
t Critical one -tail 1.681952
P(T<=t) two -tail 0.145262
t Critical two -tail 2.018082
Conclusion: no difference detected between up- and downstream Loves Creek.
t-Test: Two -Sample Assuming Unequal Variances
RR -Up RR-Dn
Mean 1.047917 1.156842
Variance 0.232404 0.204325
Observations 48 38
Hypothesized Mean Difference 0
df 82
t Stat -1.07753
P(T<=t) one -tail 0.142201
t Critical one -tail 1.663649
P(T<=t) two -tail 0.284402
t Critical two -tail 1.989319
Conclusion: no difference detected between up- and downstream Rocky River.

NO2+NO3 (mg/L)
Start Date LC -Up Effluent LC-Dn RR -Up RR-Dn
2017-11-28 15.5
2017-11-29 0.06 15.1 0.02 8.15
2017-12-14 12.6
2017-12-15 0.43 13.4 0.04 5.04
2018-01-22 12.2
2018-01-23 1.24 5.69 0.12 1.52
2018-02-26 0.31 14.2 0.69 3.25
2018-02-27 20.6
2018-03-13 0.92 11.4 3.63 0.49 0.66
2018-04-30 0.37 4.24 0.33 0.64
2018-05-02 18.1
2018-05-08 17.3
2018-05-09 0.33 19.4 0.35 2.78
2018-06-29 0.78 25.4 0.17 3.17
2018-07-03 19.4
2018-07-17 0.28 17 15.7 0.2 3.56
2018-08-28 0.28 15.9 14.6 0.23 1.89
2018-09-20 0.86 5.9 1.52 0.47 0.73
2018-10-08 17.2
2018-10-10 0.16 13.5 0.23 3.1
2018-11-26 0.65 1.62 0.84 1.01
2018-11-27 8.2
2018-12-18 0.7 2.45 0.73 0.95
2019-01-22 0.56 8.1 3.76 0.68 0.92
2019-02-11 14.4
2019-02-13 0.44 5.94 0.66 1.58
2019-03-26 0.39 1.7 0.77 0.64 0.67
2019-04-22 0.49 3.06 0.43 0.77
2019-04-23 10
2019-05-13 0.43 27 15.5 0.24 1.97
2019-05-28 23
2019-05-30 0.16
2019-06-11 1.11 21 3.6 0.11 1.27
2019-06-21 0.07
2019-06-25 18.9
2019-07-19 0.34 16.9 0.32 2.13
2019-07-23 20
2019-07-29 0.02
2019-08-12 7.7
2019-08-14 0.41 3.86 0.08 1.31
2019-08-26 23.4
2019-08-27 0.21
2019-09-16 0.13 24.4 24.9 0.14 6.43
2019-09-30 0.11
2019-10-01 26.2

2019-10-22 0.68 19.6 0.58 1.68
2019-10-24 23.4
2019-11-12 33
2019-11-14 0.53 16.6 0.24 4.51
2019-12-10 0.31 27.1 18.4 0.27 6.14
2020-01-28 0.58 8.48 1.07 1.07
2020-01-29 9.8
2020-02-24 0.52 6.5 4.8 0.83 0.83
2020-03-30 0.3 0.64 0.06 0.93
2020-04-01 2
2020-04-29 7.9
2020-04-30 0.29 0.34 0.21 0.22
2020-05-12 0.53 6.66 0.38 0.94
2020-05-13
2020-05-27 0.29
2020-05-28 0.72
2020-06-17 0.39 0.98 0.48 0.51 0.64
2020-06-29 1.2
2020-06-30 0.29
2020-07-20 0.74 4.8 8.78 0.03 0.15
2020-07-31 0.1
2020-08-05 3
2020-08-06 0.6 0.52 0.09 0.42
2020-08-31 0.09
2020-09-01 6.2
2020-09-15 0.42 1.47 0.11 0.83
2020-09-16 1.7
2020-09-29 0.1
2020-09-30 3.2
2020-10-26 0.2 13.9 14.8 0.34 3.73
2020-11-10 0.11 20.4 16 0.32 5.54
2020-12-08 0.45 8 3.34 0.54 0.98
N 38 44 38 48 38
Avg 0.48 13.43 9.20 0.32 2.16
SD 0.26 8.58 7.47 0.25 1.97
Min 0.06 0.72 0.34 0.02 0.15
Max 1.24 33 25.4 1.07 8.15

Nitrite+Nitrate Nitrogen (NO2+NO3)
O LC -Up ■ Effluent • LC-Dn 0 RR -Up ♦ RR-Dn
4" - - - -J _i^ .A_,k AA,
Anova: Single Factor
SUMMARY
Groups Count Sum Average Variance
LC -Up 38 18.32 0.482105 0.068487
Effluent 44 590.9 13.42955 73.62559
LC-Dn 38 349.65 9.201316 55.86546
RR -Up 48 15.23 0.317292 0.064327
RR-Dn 38 82.11 2.160789 3.865937
ANOVA
irce of Variat SS df MS F P-value F crit
Between Grc 5928.411 4 1482.103 55.3566 2.06E-31 2.416574
Within Grou 5381.519 201 26.77373
Total 11309.93 205
Conclusion: highly significant differences were detected among the five sites.

t-Test: Two -Sample Assuming Unequal Variances
LC -Up LC-Dn
Mean 0.482105 9.201316
Variance 0.068487 55.86546
Observations 38 38
Hypothesized Mean Difference 0
df 37
t Stat -7.18673
P(T<=t) one -tail 8E-09
t Critical one -tail 1.687094
P(T<=t) two -tail 1.6E-08
t Critical two -tail 2.026192
Conclusion: Loves Creek NO2+NO3 was strongly significantly higher downstream.
t-Test: Two -Sample Assuming Unequal Variances
RR -Up RR-Dn
Mean 0.317292 2.160789
Variance 0.064327 3.865937
Observations 48 38
Hypothesized Mean Difference 0
df 38
t Stat -5.74203
P(T<=t) one -tail 6.43E-07
t Critical one -tail 1.685954
P(T<=t) two -tail 1.29E-06
t Critical two -tail 2.024394
Conclusion: Rocky River NO2+NO3 was strongly significantly higher downstream.

NH 3 (mq/L)
Start Date LC -Up Effluent LC-Dn RR -Up RR-Dn
2017-11-29 0.02 0.5 0.04 0.02 0.02
2017-12-15 0.02 0.5 0.05 0.02 0.02
2018-01-23 0.03 0.5 0.02 0.02 0.09
2018-02-26 0.21 0.5 0.07 0.08 0.08
2018-03-13 0.1 0.5 0.09 0.11 0.11
2018-04-30 0.02 0.5 0.02 0.02 0.02
2018-05-09 0.04 0.5 0.04 0.09 0.09
2018-06-29 0.02 0.5 0.02 0.11 0.04
2018-07-17 0.02 0.5 0.02 0.02 0.02
2018-08-28 0.02 0.5 0.02 0.11 0.04
2018-09-20 0.16 2.6 0.25 0.04 0.06
2018-10-10 0.02 0.5 0.02 0.02 0.02
2018-11-26 0.02 0.5 0.02 0.02 0.02
2018-12-18 0.02 0.5 0.02 0.02 0.02
2019-01-22 0.02 0.5 0.02 0.02 0.02
2019-02-13 0.02 0.5 0.02 0.02 0.02
2019-03-26 0.02 1.6 0.02 0.02 0.02
2019-04-22 0.02 0.5 0.02 0.06 0.02
2019-05-13 0.07 0.5 0.02 0.02 0.02
2019-05-30 0.5 0.22
2019-06-11 0.15 0.5 0.03 0.02 0.02
2019-06-21 0.5 0.02
2019-07-19 0.02 0.5 0.02 0.02 0.02
2019-07-29 0.5 0.02
2019-08-14 0.02 0.5 0.08 0.02 0.02
2019-08-27 0.5 0.02
2019-09-16 0.02 0.5 0.02 0.02 0.02
2019-09-30 0.5 0.03
2019-10-22 0.02 0.5 0.02 0.02 0.02
2019-11-14 0.02 0.5 0.02 0.02 0.02
2019-12-10 0.02 0.5 0.02 0.02 0.02
2020-01-28 0.02 0.5 0.02 0.03 0.06
2020-02-24 0.02 0.5 0.02 0.02 0.02
2020-03-30 0.02 14 7.11 0.02 0.51
2020-04-30 0.12 0.5 0.14 0.13 0.13
2020-05-12 0.02 0.5 0.04 0.04 0.02
2020-05-27 0.5 0.03
2020-06-17 0.02 1.2 2.23 0.18 0.08
2020-06-30 0.5 0.03
2020-07-20 0.02 0.5 0.02 0.02 0.02
2020-08-06 0.02 3.2 7.52 0.03 0.03
2020-09-15 0.02 0.5 0.02 0.02 0.02
2020-10-26 0.02 0.5 0.02 0.02 0.02
2020-11-10 0.02 0.5 0.02 0.02 0.02
2020-12-08 0.02 0.5 0.02 0.06 0.04

N
Avg
SD
Min
Max
38 45 38 45 38
0.04 0.95 0.48 0.04 0.05
0.05 2.06 1.67 0.05 0.08
0.02 0.5 0.02 0.02 0.02
0.21 14 7.52 0.22 0.51
0 LC -Up ■ Effluent • LC-Dn A RR -Up ♦ RR-Dn
Anova: Single Factor
SUMMARY
Groups Count Sum Average Variance
LC -Up 38 1.48 0.038947 0.002118
Effluent 45 42.6 0.946667 4.242545
LC-Dn 38 18.19 0.478684 2.796968
RR -Up 45 1.94 0.043111 0.002067
RR-Dn 38 1.86 0.048947 0.006756
ANOVA
irce of Variat SS df MS F P-value F crit
Between Grc 27.86933 4 6.967332 4.771503 0.00107 2.417028
Within Grou 290.5791 199 1.460197
Total 318.4484 203
Conclusion: differences were detected among all sampling sites.

t-Test: Two -Sample Assuming Unequal Variances
LC -Up LC-Dn
Mean 0.038947 0.478684
Variance 0.002118 2.796968
Observations 38 38
Hypothesized Mean Difference 0
df 37
t Stat -1.62023
P(T<=t) one -tail 0.056838
t Critical one -tail 1.687094
P(T<=t) two -tail 0.113676
t Critical two -tail 2.026192
Conclusion: differences were not detected between the Loves Creek stations.
t-Test: Two -Sample Assuming Unequal Variances
RR -Up RR-Dn
Mean 0.043111 0.048947
Variance 0.002067 0.006756
Observations 45 38
Hypothesized Mean Difference 0
df 55
t Stat -0.39019
P(T<=t) one -tail 0.34895
t Critical one -tail 1.673034
P(T<=t) two -tail 0.6979
t Critical two -tail 2.004045
Conclusion: differences were not detected between the Rocky River stations.

Total Phosphorus (mg/L)
Start Date LC -Up Effluent LC-Dn RR -Up RR-Dn
2017-11-28 0.02
2017-11-29 0.02 0.02 0.02 0.02
2017-12-14 0.02
2017-12-15 0.032 0.027 0.02 0.02
2018-01-22 0.02
2018-01-23 0.158 0.081 0.067 0.175
2018-02-26 0.05 0.033 0.088 0.072
2018-02-27 0.046
2018-03-13 0.035 0.059 0.031 0.101 0.11
2018-04-30 0.033 0.025 0.099 0.083
2018-05-02 0.04
2018-05-08 0.04
2018-05-09 0.041 0.023 0.096 0.08
2018-06-29 0.041 0.021 0.059 0.039
2018-07-03 0.04
2018-07-17 0.044 0.04 0.024 0.067 0.045
2018-08-28 0.041 0.04 0.02 0.075 0.064
2018-09-20 0.03 0.044 0.028 0.23 0.178
2018-10-08 0.04
2018-10-10 0.054 0.036 0.114 0.088
2018-11-26 0.022 0.025 0.155 0.136
2018-11-27 0.04
2018-12-18 0.02 0.04 0.02 0.172 0.136
2019-01-22 0.02 0.04 0.02 0.109 0.086
2019-02-11 0.041
2019-02-13 0.02 0.025 0.06 0.041
2019-03-26 0.032 0.06 0.036 0.095 0.076
2019-04-22 0.038 0.034 0.16 0.116
2019-04-23 0.04
2019-05-13 0.08 0.04 0.051 0.079 0.075
2019-05-28 0.09
2019-05-30 0.058
2019-06-11 0.106 0.08 0.09 0.099 0.102
2019-06-21 0.067
2019-06-25 0.08
2019-07-19 0.059 0.066 0.091 0.067
2019-07-23 0.09
2019-07-29 0.04 0.065
2019-08-12 0.06
2019-08-14 0.056 0.061 0.067 0.064
2019-08-26 0.06
2019-08-27 0.185
2019-09-16 0.038 0.07 0.055 0.089 0.067
2019-09-30 0.095
2019-10-01 0.07

2019-10-22 0.055 0.064 0.166 0.096
2019-10-24 0.07
2019-11-12 0.08
2019-11-14 0.054 0.055 0.048 0.069
2019-12-10 0.02 0.05 0.02 0.04 0.028
2020-01-27 0.05
2020-01-28 0.025 0.03 0.139 0.144
2020-02-24 0.02 0.06 0.024 0.08 0.084
2020-03-30 0.042 0.112 0.079 0.059
2020-04-01 0.05
2020-04-30 0.125 0.126 0.296 0.311
2020-05-11 0.05
2020-05-12 0.026 0.039 0.073 0.067
2020-05-26 0.16
2020-05-27 0.168
2020-06-17 0.085 0.15 0.219 0.229 0.284
2020-06-30 0.107
2020-07-20 0.095 0.09 0.085 0.1 0.095
2020-07-31 0.079
2020-08-03 0.05
2020-08-06 0.061 0.172 0.088 0.101
2020-08-11 0.49
2020-08-31 0.074
2020-09-01 0.85
2020-09-14 1.1
2020-09-15 0.073 0.041 0.073 0.086
2020-09-28 0.04
2020-09-29 0.075
2020-10-26 0.033 0.05 0.027 0.056 0.054
2020-11-10 0.034 0.05 0.038 0.049 0.039
2020-12-08 0.027 0.08 0.029 0.164 0.137
N 38 46 38 48 38
Avg 0.049 0.107 0.051 0.101 0.095
SD 0.031 0.201 0.044 0.056 0.062
Min 0.020 0.020 0.020 0.020 0.020
Max 0.158 1.100 0.219 0.296 0.311

1.20
1.00
0.80
J
awn 0.60
0.40
0.20
0.00
Total Phosphorus (TP)
O LC -Up ■ Effluent • LC-Dn 0 RR -Up ♦ RR-Dn
■
■
•
,LQ Al Ai , r �ii i 4 +i i 01
�OyN' tiON'
ti`' oti ti(4' o°` y''
o`'' titi o(0' oti oA
�ti
otio' �oti�' �01' tio'ti tiol'
Anova: Single Factor
SUMMARY
Groups Count Sum Average Variance
LC -Up 38 1.845 0.048553 0.000972
Effluent 46 4.91 0.106739 0.040541
LC-Dn 38 1.933 0.050868 0.001913
RR -Up 48 4.865 0.101354 0.003101
RR-Dn 38 3.594 0.094579 0.003818
ANOVA
irce of Variat SS df MS F P-value F crit
Between Grc 0.131446 4 0.032862 3.007473 0.019359 2.41613
Within Grou 2.218109 203 0.010927
Total 2.349555 207
Conclusion: differences were detected among sampling sites.

t-Test: Two -Sample Assuming Unequal Variances
LC -Up LC-Dn
Mean 0.048553 0.050868
Variance 0.000972 0.001913
Observations 38 38
Hypothesized Mean Difference 0
df 67
t Stat -0.26578
P(T<=t) one -tail 0.395612
t Critical one -tail 1.667916
P(T<=t) two -tail 0.791224
t Critical two -tail 1.996008
Conclusion: no differences were detected between Loves Creek stations.
t-Test: Two -Sample Assuming Unequal Variances
RR -Up RR-Dn
Mean 0.101354 0.094579
Variance 0.003101 0.003818
Observations 48 38
Hypothesized Mean Difference 0
df 75
t Stat 0.527298
P(T<=t) one -tail 0.299772
t Critical one -tail 1.665425
P(T<=t) two -tail 0.599543
t Critical two -tail 1.992102
Conclusion: no differences were detected between Rocky River stations.

Chlorophyll- a (mg/L)
`Start Date
RR -up
2019-01-22 5.38
2019-02-13
9.73
2019-03-26
11
2019-04-22
7
2019-05-13
21.9
2019-05-30
11.8
2019-06-11
36
2019-06-21
19.7
2019-07-19
1.83
2019-07-29
13.6
2019-08-14
10.8
2019-08-27
26.1
2019-09-16
3.23
2019-09-30
2.4
2019-10-22
2.49
2019-11-14
4.78
2019-12-10
20.6
2020-01-28
6.06
2020-02-24
4.45
2020-03-30
28.2
2020-04-30
15.8
2020-05-12
5.03
2020-05-27
19.2
2020-06-17
8.98
2020-06-30
10.8
2020-07-20
2020-07-31
2020-08-06
2020-08-31
2020-09-15
2020-09-29
2020-10-26
2020-11-10
2020-12-08
46.2
13.7
38.1
9.6
12.4
44.4
3.28
5.07
4.63
N 34
Avg 14.24
SD 12.18
Min 1.83
Max 46.20

Chlorophyll -a (Chl-a)
RR -up
50
45
40
35
30
oao 25
E 20
15
10
5
0
o
,tip o N• 1, o ' • N•%1, o N•
', o o o N• o OHO o o o
tiON' P tiON' ti3O " tiON' ti01' ti01' ti01' ti01' ti���

Whole Effluent Toxicity Testing and Self Monitoring Summary
U
0
U
0
Feb May Aug Nov
O
0▪ _
U
m
0
cc
O
.00
O 1
CC
NC0039586/006
Shearon Harris Nuclear Power Plant
7Q10: LAKE
24hr p/f ac lim: 90%
a-1
N
0
N
O
Ol
C
.FLO
m
LL
CL
N
a
t
LL
rA
z[a a a • a a a a a
C
L
CO CO CO CO 0 0
O 0 0 0 0 0 0 0
U
O
Jan Apr Jul Oct
NC0027197/001
Shelby WTP, City of
0
LL
Chr Monit: 90%
LL
CL
N
n
U
C
Q a a a a
C
0o m o rq
r IN IN
0 0 0 0 0
U
0
U
0
N
Feb May Aug Nov
NC0024538/001
Shelby WWTP
0
LL
chr lim: 17%
m
0
O
N
N
C
00
CO
zan'kg a
Q a a a a
C
CL CL
ca m o
0 0 0 0
U
0
UI
0
N
Jan Apr Jul Oct
a)
U
C
O
U
NC0000175/001
Sibelco North America (Unimin Corp.)
7Q10: 45.0
NonComp: Single
chr lim: 11%
Z
Q or''';
-Ca
C
Q a a a a
C
a a a
U
0
VI
0
N
Mar Jun Sep Dec
0
z
00
O
a)
0)
K
0
IWC: 96.1
7Q10: 0.25
cu
00
C_
In
rO C1
6 ▪ ▪ O
U C
0
C
0
O
U
NC0026441/001
Siler City WWTP
chr lim: 90%
Q a 0a _
0 O O
C
0
a a a ^
co m o
O 0 0 N
Page 89 of 109
Legend: P= Fathead minnow (Pimohales oromelas). H=No Flow (facility is active). s = Solit test between Certified Labs

MONITORING REPORT(MR) VIOLATIONS for:
Report Date: 03/22/22 Page 1 of 7
Permit: NC0026441 MRs Betweei 2 - 2017 and 3 - 2022
Facility Name: % Param Nam( %
Major Minor:
Region: %
County: %
Violation Category:%
Subbasin:%
Program Category: %
Violation Action: %
PERMIT: NC0026441
FACILITY: Town of Siler City - Siler City WWTP
COUNTY: Chatham
REGION: Raleigh
Limit Violation
MONITORING OUTFACE
REPORT
LOCATION
PARAMETER
VIOLATION
DATE FREQUENCY MEASURE
UNIT OF
LIMIT
CALCULATED
VALUE
Over
VIOLATION TYPE
VIOLATION ACTION
05-2017 001
06-2017 001
09-2017 001
10-2017 001
04-2020 001
05-2020 001
05-2020 001
06-2020 001
06-2020 001
06-2020 001
06-2020 001
07-2020 001
02-2021 001
02-2021 001
02-2021 001
Effluent BOD, 5-Day (20 Deg. C) - 05/31/17 2 X week
Concentration
Effluent BOD, 5-Day (20 Deg. C) - 06/03/17 2 X week
Concentration
Effluent BOD, 5-Day (20 Deg. C) - 09/30/17 2 X week
Concentration
Effluent BOD, 5-Day (20 Deg. C) - 10/31/17 2 X week
Concentration
Effluent BOD, 5-Day (20 Deg. C) - 04/11/20 2 X week
Concentration
Effluent BOD, 5-Day (20 Deg. C) - 05/23/20 2 X week
Concentration
Effluent BOD, 5-Day (20 Deg. C) - 05/31/20 2 X week
Concentration
Effluent BOD, 5-Day (20 Deg. C) - 06/06/20 2 X week
Concentration
Effluent BOD, 5-Day (20 Deg. C) - 06/13/20 2 X week
Concentration
Effluent BOD, 5-Day (20 Deg. C) - 06/27/20 2 X week
Concentration
Effluent BOD, 5-Day (20 Deg. C) - 06/30/20 2 X week
Concentration
Effluent BOD, 5-Day (20 Deg. C) - 07/04/20 2 X week
Concentration
Effluent BOD, 5-Day (20 Deg. C) - 02/13/21 2 X week
Concentration
Effluent BOD, 5-Day (20 Deg. C) - 02/20/21 2 X week
Concentration
Effluent BOD, 5-Day (20 Deg. C) - 02/27/21 2 X week
Concentration
mg/I
mg/I
mg/I
mg/I
mg/I
mg/I
mg/I
mg/I
mg/I
mg/I
mg/I
mg/I
mg/I
mg/I
mg/I
5 5.18 3.6 Monthly Average
Exceeded
7.5 8.5 13.3 Weekly Average
Exceeded
5 5.03 0.5 Monthly Average
Exceeded
5 5.67 13.3 Monthly Average
Exceeded
7.5 8.2 9.3 Weekly Average
Exceeded
7.5 10 33.3 Weekly Average
Exceeded
5 5.53 10.5 Monthly Average
Exceeded
7.5 16.17 115.6 Weekly Average
Exceeded
7.5 14.45 92.7 Weekly Average
Exceeded
7.5 9.53 27.1 Weekly Average
Exceeded
5 11.51 130.2 Monthly Average
Exceeded
7.5 10.8 44 Weekly Average
Exceeded
15 22.77 51.8 Weekly Average
Exceeded
15 33.7 124.7 Weekly Average
Exceeded
15 30.6 104 Weekly Average
Exceeded
Proceed to
Enforcement Case
Proceed to NOV
Proceed to NOD
Proceed to NOV
Penalty Retracted
Proceed to
Enforcement Case
Proceed to
Enforcement Case
Proceed to
Enforcement Case
Proceed to
Enforcement Case
Proceed to
Enforcement Case
Proceed to
Enforcement Case
Proceed to
Enforcement Case
Proceed to
Enforcement Case
Proceed to
Enforcement Case
Proceed to
Enforcement Case

MONITORING REPORT(MR) VIOLATIONS for:
Report Date: 03/22/22 Page 2 of 7
Permit: NC0026441 MRs Betweei 2 - 2017 and 3 - 2022 Region: % Violation Category:% Program Category: %
Facility Name: % Param Nam(% County: % Subbasin:% Violation Action: %
Major Minor: %
PERMIT: NC0026441
FACILITY: Town of Siler City - Siler City WWTP
COUNTY: Chatham REGION: Raleigh
Limit Violation
MONITORING UNIT OF
OUTFALL LOCATION PARAMETER VIOLATION FREQUENCY
REPORT DATE MEASURE
LIMIT
CALCULATED
VALUE Over
VIOLATION TYPE VIOLATION ACTION
02 - 2021 001 Effluent BOD, 5-Day (20 Deg. C) - 02/28/21 2 X week mg/I 10 24.59 145.9 Monthly Average Proceed to
Concentration Exceeded Enforcement Case
03 - 2021 001 Effluent BOD, 5-Day (20 Deg. C) - 03/20/21 2 X week mg/I 15 34.73 131.6 Weekly Average Proceed to
Concentration Exceeded Enforcement Case
03 - 2021 001 Effluent BOD, 5-Day (20 Deg. C) - 03/31/21 2 X week mg/I 10 12.68 26.8 Monthly Average Proceed to
Concentration Exceeded Enforcement Case
04 - 2021 001 Effluent BOD, 5-Day (20 Deg. C) - 04/30/21 2 X week mg/I 5 5.68 13.7 Monthly Average Proceed to
Concentration Exceeded Enforcement Case
07 - 2021 001 Effluent BOD, 5-Day (20 Deg. C) - 07/31/21 2 X week mg/I 7.5 11.25 50 Weekly Average Proceed to
Concentration Exceeded Enforcement Case
07 - 2021 001 Effluent BOD, 5-Day (20 Deg. C) - 07/31/21 2 X week mg/I 5 7.64 52.8 Monthly Average Proceed to
Concentration Exceeded Enforcement Case
08 - 2021 001 Effluent BOD, 5-Day (20 Deg. C) - 08/07/21 2 X week mg/I 7.5 10.5 40 Weekly Average Proceed to
Concentration Exceeded Enforcement Case
08 - 2021 001 Effluent BOD, 5-Day (20 Deg. C) - 08/14/21 2 X week mg/I 7.5 10.35 38 Weekly Average Proceed to
Concentration Exceeded Enforcement Case
08 - 2021 001 Effluent BOD, 5-Day (20 Deg. C) - 08/28/21 2 X week mg/I 7.5 14.5 93.3 Weekly Average Proceed to
Concentration Exceeded Enforcement Case
08 - 2021 001 Effluent BOD, 5-Day (20 Deg. C) - 08/31/21 2 X week mg/I 5 10.7 114 Monthly Average Proceed to
Concentration Exceeded Enforcement Case
09 - 2021 001 Effluent BOD, 5-Day (20 Deg. C) - 09/04/21 2 X week mg/I 7.5 13.6 81.3 Weekly Average Proceed to
Concentration Exceeded Enforcement Case
09 - 2021 001 Effluent BOD, 5-Day (20 Deg. C) - 09/11/21 2 X week mg/I 7.5 26.5 253.3 Weekly Average Proceed to
Concentration Exceeded Enforcement Case
09 - 2021 001 Effluent BOD, 5-Day (20 Deg. C) - 09/18/21 2 X week mg/I 7.5 19.1 154.7 Weekly Average Proceed to
Concentration Exceeded Enforcement Case
09 - 2021 001 Effluent BOD, 5-Day (20 Deg. C) - 09/30/21 2 X week mg/I 5 14.86 197.2 Monthly Average Proceed to
Concentration Exceeded Enforcement Case
10 - 2021 001 Effluent BOD, 5-Day (20 Deg. C) - 10/02/21 2 X week mg/I 7.5 10.25 36.7 Weekly Average Proceed to
Concentration Exceeded Enforcement Case
10 - 2021 001 Effluent BOD, 5-Day (20 Deg. C) - 10/16/21 2 X week mg/I 7.5 9.8 30.7 Weekly Average Proceed to
Concentration Exceeded Enforcement Case

MONITORING REPORT(MR) VIOLATIONS for:
Report Date: 03/22/22 Page 3 of 7
Permit: NC0026441 MRs Betweei 2 - 2017 and 3 - 2022
Facility Name: % Param Nam( %
Major Minor: %
Region:
County: %
Violation Category:%
Subbasin:%
Program Category: %
Violation Action: %
PERMIT: NC0026441
FACILITY: Town of Siler City - Siler City WWTP
COUNTY: Chatham
REGION: Raleigh
Limit Violation
MONITORING OUTFACE
REPORT
LOCATION
PARAMETER
VIOLATION UNIT OF
FREQUENCY
DATE MEASURE
LIMIT
CALCULATED
VALUE
Over
VIOLATION TYPE
VIOLATION ACTION
10-2021 001
01-2022 001
01-2022 001
04-2017 001
05-2017 001
11-2017 001
01-2018 001
11-2019 001
05-2020 001
02-2021 001
02-2021 001
02-2021 001
01-2022 001
02-2021 001
02-2020 001
03-2020 001
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
BOD, 5-Day (20 Deg. C) -
Concentration
BOD, 5-Day (20 Deg. C) -
Concentration
BOD, 5-Day (20 Deg. C) -
Concentration
Cadmium, Total (as Cd)
10/31/21
01/22/22
01 /31 /22
04/30/17
2 X week
2 X week
2 X week
Monthly
Cadmium, Total (as Cd) 05/31/17 Monthly
Cadmium, Total (as Cd) 11/30/17 Monthly
Cadmium, Total (as Cd) 01/31/18 Monthly
Cadmium, Total (as Cd) 11/30/19 Monthly
Coliform, Fecal MF, MFC
Broth, 44.5 C
Coliform, Fecal MF, MFC
Broth, 44.5 C
Coliform, Fecal MF, MFC
Broth, 44.5 C
Coliform, Fecal MF, MFC
Broth, 44.5 C
Coliform, Fecal MF, MFC
Broth, 44.5 C
Flow, in conduit or thru
treatment plant
Nitrogen, Ammonia Total (as
N) - Concentration
Nitrogen, Ammonia Total (as
N) - Concentration
05/23/20
02/13/21
02/20/21
02/28/21
01/29/22
2 X week
2 X week
2 X week
2 X week
2 X week
02/28/21 Continuous
02/29/20 5 X week
03/31/20 5 X week
mg/I
mg/I
mg/I
ug/I
ug/I
ug/I
ug/I
ug/I
#/100m1
#/100m1
#/100m1
#/100m1
#/100m1
mgd
mg/I
mg/I
5 5.6 12.0
15 43.25 188.3
10 17.14 71.4
2.1 4 90.5
2.1 5 138.1
2.1 5 138.1
2.1 7.3
2.1 3
400 5,280.02
400 1,006.88
400 3,902
200 310.43
400 2,420
4 4.65
2 2.01
2 2.81
247.6
42.9
1,220.0
151.7
875.5
55.2
Monthly Average
Exceeded
Weekly Average
Exceeded
Monthly Average
Exceeded
Monthly Average
Exceeded
Monthly Average
Exceeded
Monthly Average
Exceeded
Monthly Average
Exceeded
Monthly Average
Exceeded
Weekly Geometric Mean
Exceeded
Weekly Geometric Mean
Exceeded
Weekly Geometric Mean
Exceeded
Monthly Geometric Mean
Exceeded
505 Weekly Geometric Mean
Exceeded
16.2 Monthly Average
Exceeded
0.7 Monthly Average
Exceeded
40.3 Monthly Average
Exceeded
Proceed to
Enforcement Case
Proceed to NOV
Proceed to NOV
Proceed to NOV
Proceed to
Enforcement Case
Proceed to
Enforcement Case
Proceed to
Enforcement Case
Proceed to
Enforcement Case
Proceed to
Enforcement Case
Proceed to
Enforcement Case
Proceed to
Enforcement Case
Proceed to
Enforcement Case
Proceed to NOV
Proceed to
Enforcement Case
Proceed to NOD
Proceed to
Enforcement Case

MONITORING REPORT(MR) VIOLATIONS for:
Report Date: 03/22/22 Page 4 of 7
Permit: NC0026441 MRs Betweei 2 - 2017 and 3 - 2022
Facility Name: % Param Nam( %
Major Minor: %
Region:
County: %
Violation Category:%
Subbasin:%
Program Category: %
Violation Action: %
PERMIT: NC0026441
FACILITY: Town of Siler City - Siler City WWTP
COUNTY: Chatham
REGION: Raleigh
Limit Violation
MONITORING OUTFACE
REPORT
LOCATION
PARAMETER
VIOLATION UNIT OF
FREQUENCY
DATE MEASURE
LIMIT
CALCULATED
VALUE
Over
VIOLATION TYPE
VIOLATION ACTION
04-2020 001
04-2020 001
04-2020 001
05-2020 001
05-2020 001
06-2020 001
06-2020 001
06-2020 001
06-2020 001
07-2020 001
02-2021 001
02-2021 001
02-2021 001
02-2021 001
02-2021 001
03-2021 001
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Nitrogen, Ammonia Total (as
N) - Concentration
Nitrogen, Ammonia Total (as
N) - Concentration
Nitrogen, Ammonia Total (as
N) - Concentration
Nitrogen, Ammonia Total (as
N) - Concentration
Nitrogen, Ammonia Total (as
N) - Concentration
Nitrogen, Ammonia Total (as
N) - Concentration
Nitrogen, Ammonia Total (as
N) - Concentration
Nitrogen, Ammonia Total (as
N) - Concentration
Nitrogen, Ammonia Total (as
N) - Concentration
Nitrogen, Ammonia Total (as
N) - Concentration
Nitrogen, Ammonia Total (as
N) - Concentration
Nitrogen, Ammonia Total (as
N) - Concentration
Nitrogen, Ammonia Total (as
N) - Concentration
Nitrogen, Ammonia Total (as
N) - Concentration
Nitrogen, Ammonia Total (as
N) - Concentration
Nitrogen, Ammonia Total (as
N) - Concentration
04/04/20
04/11/20
04/30/20
05/30/20
05/31/20
06/06/20
06/13/20
06/27/20
06/30/20
07/04/20
02/06/21
02/13/21
02/20/21
02/27/21
02/28/21
03/20/21
5 X week
5 X week
5 X week
5 X week
5 X week
5 X week
5 X week
5 X week
5 X week
5 X week
5 X week
5 X week
5 X week
5 X week
5 X week
5 X week
mg/I
mg/I
mg/I
mg/I
mg/I
mg/I
mg/I
mg/I
mg/I
mg/I
mg/I
mg/I
mg/I
mg/I
mg/I
mg/I
3
3
1
3
1
3
3
3
1
3
6
6
6
6
2
6
8
8.85
2.58
166.7
195
157.6
Weekly Average
Exceeded
Weekly Average
Exceeded
Monthly Average
Exceeded
3.82 27.5 Weekly Average
Exceeded
1.47 47.0 Monthly Average
Exceeded
7.7 156.7 Weekly Average
Exceeded
6.56 118.7 Weekly Average
Exceeded
3.6 20 Weekly Average
Exceeded
4.81 380.7 Monthly Average
Exceeded
4.22 40.8 Weekly Average
Exceeded
18.62 210.3
21.88 264.7
18.86 214.3
18.76 212.7
19.49 874.3
21.92 265.3
Weekly Average
Exceeded
Weekly Average
Exceeded
Weekly Average
Exceeded
Weekly Average
Exceeded
Monthly Average
Exceeded
Weekly Average
Exceeded
Proceed to
Enforcement Case
Proceed to
Enforcement Case
Proceed to
Enforcement Case
Proceed to
Enforcement Case
Proceed to
Enforcement Case
Proceed to
Enforcement Case
Proceed to
Enforcement Case
Proceed to
Enforcement Case
Proceed to
Enforcement Case
Proceed to
Enforcement Case
Proceed to
Enforcement Case
Proceed to
Enforcement Case
Proceed to
Enforcement Case
Proceed to
Enforcement Case
Proceed to
Enforcement Case
Proceed to
Enforcement Case

MONITORING REPORT(MR) VIOLATIONS for:
Report Date: 03/22/22 Page 5 of 7
Permit: NC0026441 MRs Betweei 2 - 2017 and 3 - 2022
Facility Name: % Param Nam( %
Major Minor: %
Region:
County: %
Violation Category:%
Subbasin:%
Program Category: %
Violation Action: %
PERMIT: NC0026441
FACILITY: Town of Siler City - Siler City WWTP
COUNTY: Chatham
REGION: Raleigh
Limit Violation
MONITORING OUTFACE
REPORT
LOCATION
PARAMETER
VIOLATION UNIT OF
FREQUENCY
DATE MEASURE
LIMIT
CALCULATED
VALUE
Over
VIOLATION TYPE
VIOLATION ACTION
03-2021 001
03-2021 001
04-2021 001
05-2021 001
07-2021 001
07-2021 001
08-2021 001
08-2021 001
08-2021 001
08-2021 001
08-2021 001
09-2021 001
09-2021 001
09-2021 001
09-2021 001
09-2021 001
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Nitrogen, Ammonia Total (as
N) - Concentration
Nitrogen, Ammonia Total (as
N) - Concentration
Nitrogen, Ammonia Total (as
N) - Concentration
Nitrogen, Ammonia Total (as
N) - Concentration
Nitrogen, Ammonia Total (as
N) - Concentration
Nitrogen, Ammonia Total (as
N) - Concentration
Nitrogen, Ammonia Total (as
N) - Concentration
Nitrogen, Ammonia Total (as
N) - Concentration
Nitrogen, Ammonia Total (as
N) - Concentration
Nitrogen, Ammonia Total (as
N) - Concentration
Nitrogen, Ammonia Total (as
N) - Concentration
Nitrogen, Ammonia Total (as
N) - Concentration
Nitrogen, Ammonia Total (as
N) - Concentration
Nitrogen, Ammonia Total (as
N) - Concentration
Nitrogen, Ammonia Total (as
N) - Concentration
Nitrogen, Ammonia Total (as
N) - Concentration
03/27/21
03/31/21
04/03/21
05/31 /21
07/24/21
07/31 /21
08/07/21
08/14/21
08/21/21
08/28/21
08/31 /21
09/04/21
09/11 /21
09/18/21
09/25/21
09/30/21
5 X week
5 X week
5 X week
5 X week
5 X week
5 X week
5 X week
5 X week
5 X week
5 X week
5 X week
5 X week
5 X week
5 X week
5 X week
5 X week
mg/I
mg/I
mg/I
mg/I
mg/I
mg/I
mg/I
mg/I
mg/I
mg/I
mg/I
mg/I
mg/I
mg/I
mg/I
mg/I
6
2
3
1
3
1
3
3
3
3
1
3
3
3
3
1
7.02 17 Weekly Average
Exceeded
7.6 280.2 Monthly Average
Exceeded
6.08 102.5 Weekly Average
Exceeded
1.01 0.5 Monthly Average
Exceeded
7.28 142.7 Weekly Average
Exceeded
2.57 156.5 Monthly Average
Exceeded
13.66 355.3 Weekly Average
Exceeded
9.22 207.3 Weekly Average
Exceeded
8.98 199.3 Weekly Average
Exceeded
12.56 318.7 Weekly Average
Exceeded
11.93 1,093.2 Monthly Average
Exceeded
17.22 474 Weekly Average
Exceeded
5.05 68.3 Weekly Average
Exceeded
10.32 244 Weekly Average
Exceeded
3.24 8.0 Weekly Average
Exceeded
8.18 718.1 Monthly Average
Exceeded
Proceed to
Enforcement Case
Proceed to
Enforcement Case
Proceed to
Enforcement Case
Proceed to NOD
Proceed to
Enforcement Case
Proceed to
Enforcement Case
Proceed to
Enforcement Case
Proceed to
Enforcement Case
Proceed to
Enforcement Case
Proceed to
Enforcement Case
Proceed to
Enforcement Case
Proceed to
Enforcement Case
Proceed to
Enforcement Case
Proceed to
Enforcement Case
Proceed to
Enforcement Case
Proceed to
Enforcement Case

MONITORING REPORT(MR) VIOLATIONS for:
Report Date: 03/22/22 Page 6 of 7
Permit: NC0026441 MRs Betweei 2 - 2017 and 3 - 2022
Facility Name: % Param Nam( %
Major Minor: %
Region:
County: %
Violation Category:%
Subbasin:%
Program Category: %
Violation Action: %
PERMIT: NC0026441
FACILITY: Town of Siler City - Siler City WWTP
COUNTY: Chatham
REGION: Raleigh
Limit Violation
MONITORING OUTFALL
REPORT
LOCATION
PARAMETER
VIOLATION UNIT OF
FREQUENCY
DATE MEASURE
LIMIT
CALCULATED
VALUE
Over
VIOLATION TYPE
VIOLATION ACTION
10-2021 001
01-2022 001
01-2022 001
01-2022 001
01-2022 001
01-2022 001
Monitoring Violation
MONITORING OUTFALL
REPORT
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
LOCATION
Nitrogen, Ammonia Total (as
N) - Concentration
Nitrogen, Ammonia Total (as
N) - Concentration
Nitrogen, Ammonia Total (as
N) - Concentration
Nitrogen, Ammonia Total (as
N) - Concentration
Nitrogen, Ammonia Total (as
N) - Concentration
Solids, Total Suspended -
Concentration
PARAMETER
10/02/21 5 X week
01/08/22 5 X week
01/22/22 5 X week
01/29/22 5 X week
01/31/22 5 X week
01/22/22 2 X week
mg/I
mg/I
mg/I
mg/I
mg/I
mg/I
VIOLATION UNIT OF
DATE FREQUENCY MEASURE
3
6
6
7.9 163.3 Weekly Average
Exceeded
10.38 73 Weekly Average
Exceeded
12.42 107.1 Weekly Average
Exceeded
6 26.86 347.7
2 14.35 617.5
45 105.4 134.2
LIMIT
CALCULATED
VALUE
Over
Weekly Average
Exceeded
Monthly Average
Exceeded
Weekly Average
Exceeded
VIOLATION TYPE
Proceed to
Enforcement Case
Proceed to NOV
Proceed to NOV
Proceed to NOV
Proceed to NOV
Proceed to NOV
VIOLATION ACTION
11-2018 001
11-2018 001
06-2019 001
05-2019 001
06-2019 001
05-2019 001
06-2019 001
Other Violation
MONITORING OUTFALL
REPORT
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
LOCATION
Flow, in conduit or thru
treatment plant
Flow, in conduit or thru
treatment plant
Flow, in conduit or thru
treatment plant
Flow, Total
Flow, Total
Nitrogen, Total - Quantity
(Monthly)
Nitrogen, Total - Quantity
(Monthly)
PARAMETER
11/29/18 Continuous
11/30/18 Continuous
06/15/19 Continuous
05/31/19 Monthly
06/30/19 Monthly
05/31/19 Monthly
06/30/19 Monthly
mgd
mgd
mgd
mgal/month
mgal/month
lb/mon
lb/mon
VIOLATION UNIT OF
DATE FREQUENCY MEASURE
LIMIT
CALCULATED
VALUE
Over
Frequency Violation
Frequency Violation
Frequency Violation
Frequency Violation
Frequency Violation
Frequency Violation
Frequency Violation
No Action, BPJ
No Action, BIMS
Calculation Error
Proceed to NOV
Proceed to NOV
Proceed to NOV
Proceed to NOV
Proceed to NOV
VIOLATION TYPE VIOLATION ACTION

MONITORING REPORT(MR) VIOLATIONS for:
Report Date: 03/22/22 Page 7 of 7
Permit: NC0026441
Facility Name:
Major Minor: %
MRs Betweei 2 - 2017 and 3 - 2022 Region: %
Param Nam( % County: %
Violation Category:%
Subbasin:%
ligProgram Category: %
Violation Action:
PERMIT: NC0026441
FACILITY: Town of Siler City - Siler City WWTP
COUNTY: Chatham
REGION: Raleigh
Other Violation
MONITORING OUTFACE
REPORT
LOCATION
PARAMETER
VIOLATION UNIT OF
FREQUENCY
DATE MEASURE
LIMIT
CALCULATED
VALUE Over
VIOLATION TYPE VIOLATION ACTION
09-2020
09-2021
12-2021
09/14/20
09/13/21
12/06/21
Aquatic toxicity permit
limit violation
Aquatic toxicity permit
limit violation
Aquatic toxicity permit
limit violation
Proceed to NOV
Proceed to NOV
Proceed to NOV

United States Environmental Protection Agency
EPA Washington, D.C. 20460
Water Compliance Inspection Report
Form Approved.
OMB No. 2040-0057
Approval expires 8-31-98
Section A: National Data System Coding (i.e., PCS)
Transaction Code NPDES yr/mo/day Inspection
1 IN I 2 IL I 3 I NC0026441 111 121 20/07/21 117
Type
181 I
IIIIIIIIIII
Inspector Fac Type
19I S I 2011
21IIIIII IIIIIIIIIII IIIIIII I IIIIII
P6
Inspection Work Days Facility Self -Monitoring Evaluation Rating B1 QA Reserved
671 I 7° I3 I 711 I 72 I N I 73I I 74 71
I I
I I I I I I 180
Section B: Facility Data
Name and Location of Facility Inspected (For Industrial Users discharging to POTW, also include
POTW name and NPDES permit Number)
Siler City WWTP
370 Waste Treatment Plant Rd
Siler City NC 27344
Entry Time/Date
10:00AM 20/07/21
Permit Effective Date
19/05/01
Exit Time/Date
11:00AM 20/07/21
Permit Expiration Date
19/05/31
Name(s) of Onsite Representative(s)/Titles(s)/Phone and Fax Number(s)
///
Brittany Nicole York/ORC/919-742-4581/
Other Facility Data
Name, Address of Responsible Official/Title/Phone and Fax Number
Contacted
Roy Lynch,PO Box 769 Siler City NC 27344/Town Manager/919-742-4581/
No
Section C: Areas Evaluated During Inspection (Check only those areas evaluated)
Operations & Maintenar Records/Reports Self -Monitoring Progran Laboratory
Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary)
(See attachment summary)
Name(s) and Signature(s) of Inspector(s) Agency/Office/Phone and Fax Numbers Date
Cheng Zhang DWR/RRO WQ/919-791-4200/
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# 1

3I
NPDES yr/mo/day
N C 0026441 111 121 20/07/21
117
Inspection Type
18[j
(Cont.)
1
Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary)
24-hour composite effluent sample (started at 10:19 am, July 20, 2020, ended at 10:19 am, July 21,
2020, time paced, 100 ml/20 minutes) was collected using DWR portable sampler, composite
samples were collected on July 21, 2020 for BOD, TSS, ammonia nitrogen, nitrate/nitrite, TKN, and
total phosphorous. Effluent sample was also collected for fecal coliform. Field parameters (except total
residula chlorine) were measured using a DWR YSI Proplus meter.
Analytical results
BOD: 4.2 mg/L; ammonia nitrogen: 0.06 mg/L; TSS: <6.2 mg/L; nitrate plus nitrite: 9.4 mg/L; TKN: 1.2
mg/L; total phosphorous: 0.09 mg/L; fecal coliform: 230 CFU/100m1.
Field parameters:
Temperature: 29.4 degree C; pH: 7.58; DO: 7.08 mg/L.
Influent and effluent sampling and field parameter measurement condocted by the facility were
observed and found to meet permit requirements.
The facility was found to be compliant for the sampling compliance inspection.
Page# 2

Permit: NC0026441 Owner - Facility: Siler City WWTP
Inspection Date: 07/21/2020
Inspection Type: Compliance Sampling
Operations & Maintenance
Is the plant generally clean with acceptable housekeeping?
Does the facility analyze process control parameters, for ex: MLSS, MCRT, Settleable
Solids, pH, DO, Sludge Judge, and other that are applicable?
Comment: The facility analyzes MLSS, DO, pH, sludge blankets, etc. for process control.
Influent Sampling
# Is composite sampling flow proportional?
Is sample collected above side streams?
Is proper volume collected?
Is the tubing clean?
# Is proper temperature set for sample storage (kept at less than or equal to 6.0 degrees
Celsius)?
Is sampling performed according to the permit?
Comment:
Effluent Sampling
Is composite sampling flow proportional?
Is sample collected below all treatment units?
Is proper volume collected?
Is the tubing clean?
# Is proper temperature set for sample storage (kept at less than or equal to 6.0 degrees
Celsius)?
Is the facility sampling performed as required by the permit (frequency, sampling type
representative)?
Comment: A part needed to be replaced to perform flow proportional sampling
Yes No NA NE
• ❑ ❑ ❑
El El El El
Yes No NA NE
• ❑ ❑ ❑
• ❑ ❑ ❑
Yes No NA NE
❑ • ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
Laboratory Yes No NA NE
Are field parameters performed by certified personnel or laboratory? • ❑ ❑ ❑
Are all other parameters(excluding field parameters) performed by a certified lab? • ❑ ❑ ❑
# Is the facility using a contract lab? • El El El
# Is proper temperature set for sample storage (kept at less than or equal to 6.0 degrees • ❑ ❑ ❑
Celsius)?
Incubator (Fecal Coliform) set to 44.5 degrees Celsius+/- 0.2 degrees? • ❑ ❑ ❑
Incubator (BOD) set to 20.0 degrees Celsius +/- 1.0 degrees? • ❑ El El
Comment:
Page# 3

Permit: NC0026441
Inspection Date: 07/21/2020
Owner - Facility: Siler City WWTP
Inspection Type: Compliance Sampling
Laboratory
Yes No NA NE
Page# 4

United States Environmental Protection Agency
EPA Washington, D.C. 20460
Water Compliance Inspection Report
Form Approved.
OMB No. 2040-0057
Approval expires 8-31-98
Section A: National Data System Coding (i.e., PCS)
Transaction Code NPDES yr/mo/day Inspection
1 IN I 2 IL I 3 I NC0026441 111 121 20/06/03 117
Type
181 p I
IIIIIIIIIII
Inspector Fac Type
191 S I 2011
21IIIIII IIIIIIIIIIIIIIIIII I IIIIII
P6
Inspection Work Days Facility Self -Monitoring Evaluation Rating B1 QA Reserved
671 I 761 I 711 I 72 I N I 73I I 74 71
I I
I I I I I I 180
Section B: Facility Data
Name and Location of Facility Inspected (For Industrial Users discharging to POTW, also include
POTW name and NPDES permit Number)
Siler City WWTP
370 Waste Treatment Plant Rd
Siler City NC 27344
Entry Time/Date
10:00AM 20/06/03
Permit Effective Date
19/05/01
Exit Time/Date
11:30AM 20/06/03
Permit Expiration Date
19/05/31
Name(s) of Onsite Representative(s)/Titles(s)/Phone and Fax Number(s)
///
Brittany Nicole York/ORC/919-742-4581/
Chris McCorquodale/super wwtp//
Other Facility Data
Name, Address of Responsible Official/Title/Phone and Fax Number
Contacted
Roy Lynch,PO Box 769 Siler City NC 27344/Town Manager/919-742-4581/
No
Section C: Areas Evaluated During Inspection (Check only those areas evaluated)
Operations & Maintenar Sludge Handling Dispot
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
Cheng Zhang DWR/RRO WQ/919-791-4200/
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# 1

31
NPDES yr/mo/day
N C 0026441 111 121 20/06/03
117
Inspection Type
18 101
(Cont.)
1
Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary)
Cheng Zhang visited the plant this morning, met with Chris McCorquodale, Public Works and Utilities
Director, Brittany York, WWTP ORC, and Joey Smith, collection system ORC. At the time of visit, the
plant was under "normal" operational mode. Here are some items I noted:
• The plant still did not have enough storage space to waste sludge, as a result, MLSS was high
(around 8000 mg/L), targeted range is from 4000 to 5000, settleometer reading was 535 (1-hour) and
700 (30-min), mixed liquor DO was 0.2, 0.5, 0.1, and 0.7 mg/L (from four locations in oxidation ditches)
• Equalization basins 3a and 3b (converted from old clarifiers) were used to hold wasted sludge, which
were almost full (less than 1ft to the V-notch), sludge from 3a and 3b was being transferred to sludge
thickening basin at the time of visit to get space for sludge wasting. With EQ basins 3a and 3b being
occupied, the plant has less EQ space during storm events (EQ basin 2 has capacity of 2 million
gallons, not in use at the time of visit; EQ basin 1 (250,000 gallons) contains overflow from influent
pump station wetwell);
• Sludge thickening basin (with capacity of 768,000 gallons, 15 feet deep) had about 2 feet space
available, Synagro was scheduled to haul 900,000 gallons sludge next Monday (June 8);
• Filter backwash basin (with same dimension as sludge thickening basin) had about 4 feet space
available; four tertiary filters were all on line. The filters have design capacity of 4 million gallons, once
flow is more than that, filters have to be partially bypassed;
• Due to high MLSS, sludge blankets were high in both secondary clarifiers (#1, 9 feet, #2, 9.5 feet,
sidewall depth is 14 feet), ORC stated that normal blanket would be 3 to 5 feet;
• ORC stated that during high flow periods (while filters were bypassed), aerators at both oxidation
ditches were turned off to prevent loss of solids, resulted in very little nitrification at the ditches and higl-
ammonia in the effluent. ORC also stated that they planned to add one more aerator to the ditches in
order to have higher DO in the ditches. They also plan to try limited aeration (instead of no aeration at
all) at ditches during future storm events.
Chris mentioned that an agreement had been reached recently among the Town, DWR, and Friends of
Rocky River. By the end of 2023, the WWTP upgrade will be completed. Plant upgrade include add
one more oxidation ditch, one more clarifier, four more tertiary filters, and sludge handling facility (belt
press), all three oxidation ditches will have BNR capability, flow will increase to 6 MGD (4 MGD now).
Cheng Zhang also asked about I&I in the collection system and was told that the Town has just
completed a $3M project in the North Avenue pump station area (sewer main and lateral replacement,
area with repeated SSOs in 2018 hurricanes). The Town is also in planning stage to rehab sewer
around Elder Road pump station (Blood Run Creek), including relocate the pump station (right now in
flood zone) and sewer interceptor replacement.
Page# 2

Permit: NC0026441
Inspection Date: 06/03/2020
Owner - Facility: Siler City WWTP
Inspection Type: Reconnaissance
Operations & Maintenance
Is the plant generally clean with acceptable housekeeping?
Does the facility analyze process control parameters, for ex: MLSS, MCRT, Settleable
Solids, pH, DO, Sludge Judge, and other that are applicable?
Comment: MLSS, DO, pH, sludge blankets, etc.
Oxidation Ditches
Are the aerators operational?
Are the aerators free of excessive solids build up?
# Is the foam the proper color for the treatment process?
Does the foam cover less than 25% of the basin's surface?
Is the DO level acceptable?
Are settleometer results acceptable (> 30 minutes)?
Is the DO level acceptable?(1.0 to 3.0 mg/I)
Are settelometer results acceptable?(400 to 800 ml/I in 30 minutes)
Yes No NA NE
• ❑ ❑ ❑
• ❑ ❑ ❑
Yes No NA NE
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
❑ • ❑ ❑
❑ • ❑ ❑
❑ • ❑ ❑
• ❑ ❑ ❑
Comment: MLSS were about 8000 mg/L about 60% higher than targeted value (5000 mg/L). DO was
0.2, 0.5, 0.1, and 0.7 mg/L (from four locations in oxidation ditches)
Secondary Clarifier Yes No NA NE
Is the clarifier free of black and odorous wastewater?
Is the site free of excessive buildup of solids in center well of circular clarifier?
Are weirs level?
Is the site free of weir blockage?
Is the site free of evidence of short-circuiting?
Is scum removal adequate?
Is the site free of excessive floating sludge?
Is the drive unit operational?
Is the return rate acceptable (low turbulence)?
Is the overflow clear of excessive solids/pin floc?
Is the sludge blanket level acceptable? (Approximately'/ of the sidewall depth)
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
❑ • ❑ ❑
Comment: sludge blankets were high in both secondary clarifiers (#1, 9 feet, #2, 9.5 feet, sidewall dept
is 14 feet)
Aerobic Digester Yes No NA NE
Is the capacity adequate? ❑ • ❑ ❑
Page# 3

Permit: NC0026441
Inspection Date: 06/03/2020
Owner - Facility: Siler City WWTP
Inspection Type: Reconnaissance
Aerobic Digester
Is the mixing adequate?
Is the site free of excessive foaming in the tank?
# Is the odor acceptable?
# Is tankage available for properly waste sludge?
Yes No NA NE
• ❑ ❑ ❑
❑ • ❑ ❑
Comment: Digester A and B were almost full, the facility was using EQ Basin 3A and 3B as digesters at
the time of inspection, which were also full. Sludge thickening basin had about two feet
space availabe. Sludge was being transfered from EQ Basins 3A and 3B to the sludge
thickening basin at the time of site visit.
Page# 4

NH3/TRC WLA Calculations
Siler City WWTP
PermitNo. NC0026441
Prepared By: Gary Perlmutter
Enter Design Flow (MGD): 4
Enter s7Q10 (cfs): 0.09
Enter w7Q10 (cfs): 0.23
Total Residual Chlorine (TRC)
Daily Maximum Limit (ug/l)
s7Q10 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (UG/L)
Upstream Bkgd (ug/l)
IWC (%)
Allowable Conc. (ug/l)
Fecal Coliform
Monthly Average Limit:
(If DF >331; Monitor)
(If DF<331; Limit)
Dilution Factor (DF)
0.09
4
6.2
17.0
0
98.57
17
Ammonia (Summer)
Monthly Average Limit (mg NH3-N/I)
s7Q10 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (MG/L)
Upstream Bkgd (mg/I)
IWC (%)
Allowable Conc. (mg/I)
Ammonia (Winter)
Monthly Average Limit (mg NH3-N/I)
w7Q10 (CFS)
200/100m1 DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (MG/L)
1.01 Upstream Bkgd (mg/I)
IWC (%)
Allowable Conc. (mg/I)
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
0.09
4
6.2
1.0
0.22
98.57
1.0
0.23
4
6.2
1.8
0.22
96.42
1.9
Fecal Coliform
1. Monthly Avg limit x 2 = 400/100 ml = Weekly Avg limit (Municipals) = Daily Max limit (Non -Muni)

NH3/TRC WLA Calculations
Siler City WWTP
PermitNo. NC0026441
Prepared By: Gary Perlmutter
Enter Design Flow (MGD): 6
Enter s7Q10 (cfs): 0.09
Enter w7Q10 (cfs): 0.23
Total Residual Chlorine (TRC)
Daily Maximum Limit (ug/l)
s7Q10 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (UG/L)
Upstream Bkgd (ug/l)
IWC (%)
Allowable Conc. (ug/l)
Fecal Coliform
Monthly Average Limit:
(If DF >331; Monitor)
(If DF<331; Limit)
Dilution Factor (DF)
0.09
6
9.3
17.0
0
99.04
17
Ammonia (Summer)
Monthly Average Limit (mg NH3-N/I)
s7Q10 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (MG/L)
Upstream Bkgd (mg/I)
IWC (%)
Allowable Conc. (mg/I)
Ammonia (Winter)
Monthly Average Limit (mg NH3-N/I)
w7Q10 (CFS)
200/100m1 DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (MG/L)
1.01 Upstream Bkgd (mg/I)
IWC (%)
Allowable Conc. (mg/I)
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
0.09
6
9.3
1.0
0.22
99.04
1.0
0.23
6
9.3
1.8
0.22
97.59
1.8
Fecal Coliform
1. Monthly Avg limit x 2 = 400/100 ml = Weekly Avg limit (Municipals) = Daily Max limit (Non -Muni)

Facility Name
WWTP/WTP Class
NPDES Permit
Outfall
Flow, Qw (MGD)
Receiving Stream
HUC Number
Stream Class
Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators
MAXIMUM DATA POINTS = 58
REQUIRED DATA ENTRY
Table 1. Project Information
❑ CHECK IF HQW OR ORW WQS
Siler City WWTP
Grade IV
NC0026441
001
6.000
Loves Creek
03030003
❑ Apply WS Hardness WQC
7Q10s (cfs)
7Q1Ow (cfs)
30Q2 (cfs)
QA (cfs)
1 Q1 Os (cfs)
0.09
0.23
0.32
8.70
0.08
Effluent Hardness
95.5 mg/L (Avg)
Upstream Hardness
39.2 mg/L (Avg)
Combined Hardness Chronic
Combined Hardness Acute
94.96 mg/L
95.02 mg/L
Data Source(s)
❑ CHECK TO APPLY MODEL
Data from submitted DMRs and PPAs; Hardness
data provided by the permittee by request.
Streamflows updated by USGS per request in July
2021.
Table 2. Parameters of Concern
Par01
Par02
Par03
Par04
Par05
Par06
Par07
Par08
Par09
Par10
Par11
Par12
Par13
Par14
Par15
Par16
Par17
Par18
Par19
Par20
Par21
Par22
Par23
Par24
Name
WQS
Type Chronic Modifier
Acute
PQL Units
Arsenic
Aquactic Life
C
150
FW
340
ug/L
Arsenic
Human Health
Water Supply
C
10
HH/WS
N/A
ug/L
Beryllium
Aquatic Life
NC
6.5
FW
65
ug/L
Cadmium
Aquatic Life
NC
1.6162
FW
10.3806
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 Ill
Aquatic Life
NC
351.2295
FW
2701.4991
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
24.6508
FW
36.8457
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
12.9350
FW
332.1605
ug/L
Mercury
Aquatic Life
NC
12
FW
0.5
ng/L
Molybdenum
Human Health
NC
2000
HH
ug/L
Nickel
Aquatic Life
NC
115.1469
FW
1037.2630
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
2.9462
ug/L
Zinc
Aquatic Life
NC
392.6345
FW
389.6554
ug/L
Chloroform
Human Health
NC
2000
HH
pg/L
Dichlorobromomethane
Human Health
C
27
HH
pg/L
Bis (2-ethylhexyl) phthalate
Human Health
C
0.37
HH
pg/L
26641 RPA 4.0 MGD, input
3/23/2022

REASONABLE POTENTIAL ANALYSIS
H1
Effluent Hardness
Date Data
3/20/2018
9/10/2019
9/10/2020
3/4/2021
3/5/2021
3/6/2021
3/7/2021
3/8/2021
212
128
100
76
72
68
56
52
BDL=1/2DL Results
212 Std Dev. 53.1709
128 Mean 95.5000
100 C.V. (default) 0.6000
76 n 8
72 10th Per value 54.80 mg/L
68 Average Value 95.50 mg/L
56 Max. Value 212.00 mg/L
Use "PASTE SPECIAL -
Values" then "COPY" .
Maximum data points =
58
52
H2
Upstream Hardness
Date Data
3/4/2021
3/5/2021
3/6/2021
3/7/2021
3/8/2021
36
40
40
40
40
BDL=1/2DL
36
40
40
40
40
Results
Std Dev.
Mean
C.V. (default)
n
10th Per value
Average Value
Max. Value
Use "PASTE SPECIAL -
Values" then "COPY" .
Maximum data points =
58
1.7889
39.2000
0.6000
5
37.60 mg/L
39.20 mg/L
40.00 mg/L
26641 RPA 4.0 MGD, data
- 3 - 3/23/2022

REASONABLE POTENTIAL ANALYSIS
Par01 & Par02
Arsenic
Date Data BDL=1/2DL Results
1 3/20/2018 < 10 5 Std Dev. 0.0000
2 6/12/2018 < 10 5 Mean 5.0000
3 9/11/2018 < 10 5 C.V. 0.0000
4 12/18/2018 < 10 5 n 16
5 3/12/2019 < 10 5
6 6/11/2019 < 10 5 Mult Factor= 1.00
7 9/10/2019 < 10 5 Max. Value 5.0 ug/L
8 12/10/2019 < 10 5 Max. Pred Cw 5.0 ug/L
9 3/10/2020 < 10 5
10 6/9/2020 < 10 5
11 9/14/2020 < 10 5
12 12/8/2020 < 10 5
13 3/8/2021 < 10 5
14 6/8/2021 < 10 5
15 9/14/2021 < 10 5
16 12/6/2021 < 10 5
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use "PASTE SPECIAL -
Values" then "COPY" .
Maximum data points =
58
Par03
Beryllium
Date Data BDL=1/2DL Results
1 3/20/2018 < 5 2.5 Std Dev. 0.0000
2 9/10/2019 < 5 2.5 Mean 2.5000
3 9/10/2020 < 5 2.5 C.V. (default) 0.6000
4 n 3
5
6 Mult Factor = 3.00
7 Max. Value 2.50 ug/L
8 Max. Pred Cw 7.50 ug/L
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use "PASTE SPECIAL -
Values" then "COPY" .
Maximum data points =
58
26641 RPA 4.0 MGD, data
- 4 - 3/23/2022

REASONABLE POTENTIAL ANALYSIS
Par04
Cadmium
Date
2/5/2018
3/20/2018
4/3/2018
5/8/2018
6/12/2018
7/9/2018
8/1/2018
9/25/2018
10/2/2018
11/15/2018
12/18/2018
1/2/2019
2/5/2019
3/12/2019
4/4/2019
5/7/2019
6/11/2019
7/9/2019
8/6/2019
9/10/2019
10/3/2019
11/4/2019
12/10/2019
1/9/2020
2/6/2020
3/10/2020
4/1/2020
5/7/2020
6/9/2020
7/6/2020
8/5/2020
9/14/2020
10/13/2020
11/10/2020
12/8/2020
1 /5/2021
2/2/2021
3/8/2021
4/8/2021
5/5/2021
6/8/2021
7/8/2021
8/3/2021
9/14/2021
10/5/2021
11/2/2021
12/6/2021
1/5/2022
Data
BDL=1/2DL
2 1
2 1
2 1
2 1
2 1
2 1
2 1
2 1
2 1
2 1
2 1
2 1
2 1
2 1
2 1
2 1
2 1
2 1
2 1
2 1
2 1
3 1
2 3
2 1
2 1
2 1
2 1
2 1
2 1
2 1
2 1
2 1
2 1
2 1
2 1
2 1
2 1
2 1
2 1
2 1
2 1
2 1
2 1
2 1
2 1
2 1
2 1
2 1
Results
Std Dev.
Mean
C.V.
n
Mult Factor =
Max. Value
Max. Pred Cw
Use "PASTE SPECIAL -
Values" then "COPY" .
Maximum data points =
58
0.2887
1.0417
0.2771
48
1.03
3.000 ug/L
3.090 ug/L
Par05
Chlorides
Date Data
11/7/2017
12/4/2017
3/20/2018
6/12/2018
9/11/2018
12/18/2018
3/12/2019
6/11/2019
9/10/2019
12/10/2019
3/10/2020
6/9/2020
9/14/2020
12/8/2020
3/8/2021
45.6
49
40
48
48.3
28.3
57.3
89
150
158
131
119
117
89
128
BDL=1/2DL
45.6
49
40
48
48.3
28.3
57.3
89
150
158
131
119
117
89
128
Results
Std Dev.
Mean
C.V.
n
Mult Factor =
Max. Value
Max. Pred Cw
Use "PASTE SPECIAL -
Values" then "COPY" .
Maximum data points = 58
44.1335
86.5
0.5102
15
1.4
158.0 mg/L
224.4 mg/L
26641 RPA 4.0 MGD, data
- 5 - 3/23/2022

REASONABLE POTENTIAL ANALYSIS
Par06
Chlorinated Phenolic Compounds
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
NO DATA
0
N/A
N/A ug/L
N/A ug/L
Par07
Total Phenolic Compounds
Date Data
3/20/2018
9/10/2019
9/10/2020 <
23
11
10
BDL=1/2DL
23
11
5
Results
Std Dev.
Mean
C.V. (default)
n
Mult Factor =
Max. Value
Max. Pred Cw
Use "PASTE SPECIAL -
Values" then "COPY" .
Maximum data points =
58
9.1652
13.0000
0.6000
3
3.00
23.0 ug/L
69.0 ug/L
26641 RPA 4.0 MGD, data
- 6 - 3/23/2022

REASONABLE POTENTIAL ANALYSIS
Par08
Chromium III
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
NO DATA
0
N/A
N/A pg/L
N/A pg/L
Par09
Chromium VI
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
NO DATA
0
N/A
N/A pg/L
N/A pg/L
26641 RPA 4.0 MGD, data
- 7 - 3/23/2022

REASONABLE POTENTIAL ANALYSIS
Par10
Chromium, Total
Date Data BDL=1/2DL Results
1 3/20/2018 < 5 2.5 Std Dev. 0.0000
2 6/12/2018 < 5 2.5 Mean 2.5000
3 9/11/2018 < 5 2.5 C.V. 0.0000
4 12/18/2018 < 5 2.5 n 17
5 3/12/2019 < 5 2.5
6 6/11/2019 < 5 2.5 Mult Factor= 1.00
7 9/10/2019 < 5 2.5 Max. Value 2.5 .g/L
8 12/10/2019 < 5 2.5 Max. Pred Cw 2.5 pg/L
9 3/10/2020 < 5 2.5
10 6/9/2020 < 5 2.5
11 9/14/2020 < 5 2.5
12 12/8/2020 < 5 2.5
13 1/8/2021 < 5 2.5
14 3/8/2021 < 5 2.5
15 6/8/2021 < 5 2.5
16 9/14/2021 < 5 2.5
17 12/6/2021 < 5 2.5
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use "PASTE SPECIAL -
Values" then "COPY" .
Maximum data points =
58
Pall
Copper
Date Data BDL=1/2DL Results
1 3/20/2018 4 4 Std Dev. 3.4192
2 6/12/2018 7 7 Mean 7.7647
3 9/11/2018 10 10 C.V. 0.4404
4 12/18/2018 5 5 n 17
5 3/12/2019 7 7
6 6/11/2019 11 11 Mult Factor = 1.32
7 9/10/2019 11 11 Max. Value 16.00 ug/L
8 12/10/2019 13 13 Max. Pred Cw 21.12 ug/L
9 3/10/2020 16 16
10 6/9/2020 4 4
11 9/14/2020 6 6
12 12/8/2020 6 6
13 1/8/2021 6 6
14 3/8/2021 7 7
15 6/8/2021 6 6
16 9/14/2021 4 4
17 12/6/2021 9 9
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use "PASTE SPECIAL -
Values" then "COPY" .
Maximum data points =
58
26641 RPA 4.0 MGD, data
- 8 - 3/23/2022

REASONABLE POTENTIAL ANALYSIS
Par12
Cyanide
Date Data
3/20/2018
9/10/2019 <
9/10/2020
BDL=1/2DL
8 5
5 5
6 5
Results
Std Dev.
Mean
C.V. (default)
n
Mult Factor =
Max. Value
Max. Pred Cw
Use "PASTE SPECIAL -
Values" then "COPY" .
Maximum data points =
58
0.0000
5.00
0.6000
3
3.00
5.0 ug/L
15.0 ug/L
Par13
Fluoride
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
NO DATA
0
N/A
N/A ug/L
N/A ug/L
26641 RPA 4.0 MGD, data
- 9 - 3/23/2022

REASONABLE POTENTIAL ANALYSIS
Par14
Lead
Date
3/20/2018
6/12/2018
9/11/2018
12/18/2018
3/12/2019
6/11/2019
9/10/2019
12/10/2019
3/10/2020
6/9/2020
9/14/2020
12/8/2020
1 /8/2021
3/8/2021
6/8/2021
9/14/2021
12/6/2021
BDL=1/2DL Results
< 10 5 Std Dev.
< 10 5 Mean
< 10 5 C.V.
< 10 5 n
< 10 5
< 10 5 Mult Factor =
< 10 5 Max. Value
< 10 5 Max. Pred Cw
< 10 5
< 10 5
< 10 5
< 10 5
< 10 5
< 10 5
< 10 5
< 10 5
< 10 5
Use "PASTE SPECIAL -
Values" then "COPY" .
Maximum data points =
58
0.0000
5.0000
0.0000
17
1.00
5.000 ug/L
5.000 ug/L
Par15
Mercury
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
NO DATA
0
N/A
N/A ng/L
N/A ng/L
26641 RPA 4.0 MGD, data
- 10 - 3/23/2022

REASONABLE POTENTIAL ANALYSIS
Par16
Molybdenum
Date Data BDL=1/2DL Results
1 3/20/2018 < 5 2.5 Std Dev. 0.0000
2 6/12/2018 < 5 2.5 Mean 2.5000
3 9/11/2018 < 5 2.5 C.V. 0.0000
4 12/18/2018 < 5 2.5 n 17
5 3/12/2019 < 5 2.5
6 6/11/2019 < 5 2.5 Mult Factor= 1.00
7 9/10/2019 < 5 2.5 Max. Value 2.5 ug/L
8 12/10/2019 < 5 2.5 Max. Pred Cw 2.5 ug/L
9 3/10/2020 < 5 2.5
10 6/9/2020 < 5 2.5
11 9/14/2020 < 5 2.5
12 12/8/2020 < 5 2.5
13 1/8/2021 < 5 2.5
14 3/8/2021 < 5 2.5
15 6/8/2021 < 5 2.5
16 9/14/2021 < 5 2.5
17 12/6/2021 < 5 2.5
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use "PASTE SPECIAL -
Values" then "COPY" .
Maximum data points =
58
Par17 & Par18
Nickel
Date Data BDL=1/2DL Results
1 3/20/2018 < 10 5 Std Dev. 2.3570
2 6/12/2018 < 10 5 Mean 5.5556
3 9/11/2018 < 10 5 C.V. 0.4243
4 10/11/2018 < 10 5 n 18
5 12/18/2018 < 10 5
6 3/12/2019 < 10 5 Mult Factor = 1.29
7 6/11/2019 < 10 5 Max. Value 15.0 pg/L
8 9/10/2019 < 10 5 Max. Pred Cw 19.4 pg/L
9 12/10/2019 < 10 5
10 3/10/2020 < 10 5
11 6/9/2020 < 10 5
12 9/14/2020 < 10 5
13 12/8/2020 < 10 5
14 1/8/2021 < 10 5
15 3/8/2021 < 10 5
16 6/8/2021 < 10 5
17 9/14/2021 15 15
18 12/6/2021 < 10 5
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use "PASTE SPECIAL -
Values" then "COPY" .
Maximum data points =
58
26641 RPA 4.0 MGD, data
- 11 - 3/23/2022

REASONABLE POTENTIAL ANALYSIS
Par19
Selenium
Date Data BDL=1/2DL Results
1 3/20/2018 < 10 5 Std Dev. 0.0000
2 6/12/2018 < 10 5 Mean 5.0000
3 9/11/2018 < 10 5 C.V. 0.0000
4 11/11/2018 < 10 5 n 18
5 12/18/2018 < 10 5
6 3/12/2019 < 10 5 Mult Factor = 1.00
7 6/11/2019 < 10 5 Max. Value 5.0 ug/L
8 9/10/2019 < 10 5 Max. Pred Cw 5.0 ug/L
9 12/10/2019 < 10 5
10 3/10/2020 < 10 5
11 6/9/2020 < 10 5
12 9/14/2020 < 10 5
13 12/8/2020 < 10 5
14 1/8/2021 < 10 5
15 3/8/2021 < 10 5
16 6/8/2021 < 10 5
17 9/14/2021 < 10 5
18 12/6/2021 < 10 5
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use "PASTE SPECIAL -
Values" then "COPY" .
Maximum data points =
58
Par20
Silver
Date Data BDL=1/2DL Results
1 3/20/2018 < 5 2.5 Std Dev. 0.0000
2 9/10/2019 < 5 2.5 Mean 2.5000
3 9/10/2020 < 5 2.5 C.V. (default) 0.6000
4 n 3
5
6 Mult Factor = 3.00
7 Max. Value 2.500 ug/L
8 Max. Pred Cw 7.500 ug/L
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use "PASTE SPECIAL -
Values" then "COPY" .
Maximum data points =
58
26641 RPA 4.0 MGD, data
- 12 - 3/23/2022

REASONABLE POTENTIAL ANALYSIS
Par21
Zinc
Date Data
3/20/2018
6/12/2018
9/11/2018 <
11/11/2018 <
12/18/2018
3/12/2019
6/11/2019
9/10/2019
12/10/2019
3/10/2020
6/9/2020
9/14/2020
12/8/2020
1 /8/2021
3/8/2021
6/8/2021
9/14/2021
12/6/2021
16
12
10
10
13
21
17
15
15
31
16
24
26
26
26
28
19
30
BDL=1/2DL
16
12
5
5
13
21
17
15
15
31
16
24
26
26
26
28
19
30
Results
Std Dev.
Mean
C.V.
n
Mult Factor =
Max. Value
Max. Pred Cw
Use "PASTE SPECIAL -
Values" then "COPY" .
Maximum data points =
58
Par22
Chloroform
7.8684
19.1667
0.4105
18
1.28
31.0 ug/L
39.7 ug/L
Date Data
3/20/2018 3.82
9/10/2019 6.92
9/10/2020 < 1
BDL=1/2DL
3.82
6.92
0.5
Results
Std Dev.
Mean
C.V. (default)
n
Use "PASTE SPECIAL -
Values" then "COPY" .
Maximum data points =
58
3.2106
3.7467
0.6000
3
Mult Factor = 3.00
Max. Value 6.920000 dig/L
Max. Pred Cw 20.760000 .Ig/L
26641 RPA 4.0 MGD, data
- 13 - 3/23/2022

REASONABLE POTENTIAL ANALYSIS
Par23
Dichlorobromomethane
Date Data
3/20/2018
9/10/2019 <
9/10/2020 <
BDL=1/2DL
1.25 1.25
1 0.5
1 0.5
Results
Std Dev.
Mean
C.V. (default)
n
Mult Factor =
Max. Value
Max. Pred Cw
Use "PASTE SPECIAL -
Values" then "COPY" .
Maximum data points =
58
0.4330
0.7500
0.6000
3
3.00
1.250000 pg/L
3.750000 pg/L
Par24
Bis (2-ethylhexyl) phthalate
Date Data
3/20/2018
9/10/2019 <
9/10/2020 <
BDL=1/2DL
15.1 15.1
10 5
10 5
Results
Std Dev.
Mean
C.V. (default)
n
Use "PASTE SPECIAL -
Values" then "COPY" .
Maximum data points =
58
5.8312
8.3667
0.6000
3
Mult Factor = 3.00
Max. Value 15.100000 pg/L
Max. Pred Cw 45.300000 pg/L
-14-
26641 RPA 4.0 MGD, data
3/23/2022

REASONABLE POTENTIAL ANALYSIS
Par25
0
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 -
Values" then "COPY" .
Maximum data points =
58
NO DATA
NO DATA
NO DATA
0
N/A
N/A
N/A
26641 RPA 4.0 MGD, data
- 15 - 3/23/2022

Slier City WWTP
NC0026441
Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators
MAXIMUM DATA POINTS = 58
Qw (MGD) = 6.0000
1Q1OS (cfs) = 0.08
7Q1OS (cfs) = 0.09
7Q1OW (cfs) = 0.23
30Q2 (cfs) = 0.32
Avg. Stream Flow, QA (cfs) = 8.70
Receiving Stream: Loves Creek HUC 03030003
WWTP/WTP Class:
IWC% @ 1Q1OS =
IWC% @ 7Q1OS =
IWC% @ 7Q1OW =
IWC% @ 30Q2 =
IW%C @ QA =
Stream Class:
Grade IV
99.14712154
99.04153355
97.58656873
96.67359667
51.66666667
C
Outfall 001
Qw=6MGD
COMBINED HARDNESS (mg/L)
Acute = 95.02 mg/L
Chronic = 94.96 mg/L
PARAMETER
TYPE
NC STANDARDS OR EPA CRITERIA
_1
co
=
REASONABLE POTENTIAL RESULTS
RECOMMENDED ACTION
Chronic Applied Acute
Standard
11 # Det. Max Pred Cw Allowable Cw
Arsenic
Arsenic
_
C
C
150 FW(7Q10s) 340
10 EIH/WS(Qavg)
ug/L
ug/L
16 0
5.0
NO DETECTS
Acute (FW): 342.9
_ _ _ _____ _______________________________
Chronic (FW): 151.5
_Max_MDL = 10 ___
Chronic (HH): 19.4
Max MDL = 10
_ _ _ _ _ _ _ _ _ _ _ ____
No detects at < 10 ug/L. No monitoring or limits
required.
Beryllium
NC
6.5 FW(7Q10s) 65
ug/L'
3 0
Note: n < 9
Limited data set
7.50
C.V. (default)
NO DETECTS
Acute: 65.56
___ _ ______ ___
Chronic: 6.56
Max MDL = 5
_ _ _ _ _ _ _ _ _ _ _ _____
No detects at < 5 ug/L. No monitoring or limits
required.
Cadmium
NC
1.6162 FW(7Q10s) 10.3806
ug/L
48 2
3.090
Acute: 10.470
_ _ _ _ _ _ _ _ _ _ _ _ _
Chronic: 1.632
1 value(s) > Allowable Cw
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _
RP found based on 1 detect: 3 ug/L on 10/3/2019,
and many ND < 2 ug/L. Apply qtrly monitoring.
Chlorides
NC
230 FW(7Q10s)
mg/L
15 15
224.4
Acute: NO WQS
_ _ _ _ _ _ _ _ _ _ _ _
Chronic: 232.2
No value > Allowable Cw
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _
No RP , Predicted Max >_ 50% of Allowable Cw -
apply Quarterly Monitoring
Chlorinated Phenolic Compounds
NC
1 A(30Q2)
ug/L
0 0
N/A
Acute: NO WQS
-_ _ ----- _
--------------------------------
Chronic: 1.0
Total Phenolic Compounds
NC
300 A(30Q2)
ug/L
3 2
Note: n < 9
Limited data set
69.0
C.V. (default)
Acute: NO WQS
___ _ ____ _ ________________
Chronic: 310.3
No value > Allowable Cw
_______
No RP for limited dataset (n<8 samples)
Chromium III
NC
351.2295 FW(7Q10s) 2701.4991
µg/L
0 0
N/A
Acute: 2,724.7
-_ _ ---- _ _
-------------------------------
Chronic: 354.6
Chromium VI
NC
11 FW(7Q10s) 16
µg/L'
0 0
N/A
Acute: 16.1
-_ _ ---- _ _
-------------------------------
Chronic: -11.1
Chromium, Total
NC
Kg/17
0
2.5
NO DETECTS
Max reported value = 2.5
Max MDL = 5
a: No monitoring required if all Total Chromium
samples are < 5 pg/L or Pred. max for Total Cr is <
allowable Cw for Cr VI.
Page 16 of 19
26641 RPA 4.0 MGD, rpa
3/23/2022

Slier City WWTP
NC0026441
Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators
Outfall 001
Qw=6MGD
Copper
NC
24.6508 FW(7Q10s) 36.8457
ug/L
17 17
21.12
Acute: 37.16
_ _ _ _ _ _ _ _ _ _ _ _
Chronic: 24.89
No value > Allowable Cw
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _
No RP , Predicted Max >_ 50% of Allowable Cw -
apply Quarterly Monitoring
Cyanide
NC
5 FW(7Q10s) 22
10
ug/L
3 2
Note: n < 9
Limited data set
15.0
C.V. (default)
Acute: 22.2
___ _ ______ ___
Chronic: 5.0
No value > Allowable Cw
_ _ _ _ _ _ _ ___ _ _ _ ___
No value > 10 ug/L; all results < 10 ug/L considered
compliant due to analytical issues. No monitoring.
Fluoride
NC
1800 FW(7Q10s)
ug/L
0 0
N/A
Acute: NO WQS
-_ _ ---_ _
-------------------------------
Chronic: -1,817.4
Lead
NC
12.9350 FW(7Q10s) 332.1605
ug/L
17 0
5.000
NO DETECTS
Acute: 335.018
_ _ _ _ _ _ _ _ _ _ _ _
Chronic: 13.060
Max MDL = 10
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _
All nondetects at < 10 ug/L; no monitoring required.
Mercury
NC
12 FW(7Q10s)
0.5
ng/L
0 0
N/A
Acute: NO WQS
-- _ _ ------------------------------------
Chronic:12 1
Molybdenum
NC
2000 HH(7Q10s)
ug/L
17 0
2.5
NO DETECTS
Acute: NO WQS
___ _ ____ _ ___
Chronic: 2,019.4
Max MDL = 5
_ ___ _ _ _ _ _ _ _ _ _ ___
No RP, Predicted Max < 50% of Allowable Cw - No
Monitoring required
Nickel
Nickel
NC
NC
115.1469 FW(7Q10s) 1037.2630
25.0000 WS(7Q10s)
µg/L
µg/L
18 1
19.4
Acute (FW): 1,046.2
_ _ _ _ _ _ _ _ _ _ _
Chronic (FW): 116.3
No value > Allowable Cw
Chronic (WS): 25.2
No value > Allowable Cw
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _
All nondetects at < 10 ug/L with one detect of 29 ug/L
in 12/12/2017. No monitoring required.
Selenium
NC
5 FW(7Q10s) 56
ug/L
18 0
5.0
NO DETECTS
Acute: 56.5
___ _ ______ ___
Chronic: 5.0
Max MDL = 10
_ _ _ _ _ _ _ _ _ _ _ _ ___
All nondetects at < 10 ug/L; PQL = 1 ug/L. Apply
quarterly monitoring, test to lower level.
Silver
_
NC
0.06 FW(7Q10s) 2.9462
ug/L
3 0
Note: n < 9
Limited data set
7.500
C.V. (default)
NO DETECTS
Acute: 2.972
___ _ ____ _ ___
Chronic: 0.061
Max MDL = 5
_ _ _ _ _ _ _ _ _ _ _ _____
All nondetects < 5 ug/L; PQL = 1.0 ug/L. Apply
quarterly monitoring and test to lower limit.
Zinc
NC
392.6345 FW(7Q10s) 389.6554
ug/L
18 16
39.7
Acute: 393.0
_ _ _ _ _ _ _ _ _ _ _ _
Chronic: 396.4
No value > Allowable Cw
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
No RP, Predicted Max < 50% of Allowable Cw - No
Monitoring required
Chloroform
_
NC
2000 HH(7Q10s)
µg/L
3 2
Note: n < 9
Limited data set
20.76000
C.V. (default)
Acute: NO WQS
___ _ ____ _ _ ______________
Chronic: 2019.35484
No value > Allowable Cw
_______
No RP for limited dataset (n<8 samples)
Dichlorobromomethane
C
27 HH(Qavg)
µg/L
3 1
Note: n < 9
Limited data set
3.75000
C.V. (default)
Acute: NO WQS
___ _ ____ _ _ _____________
Chronic: 52.25806
No value > Allowable Cw
_______
No RP for limited dataset (n<8 samples)
Bis (2-ethylhexyl) phthalate
C
0.37 HH(Qavg)
µg/L
3 1
Note: n < 9
Limited data set
45.30000
C.V. (default)
Acute: NO WQS
_ _ _ _ _ _ _ _ _ _ _
Chronic: 0.71613
3 value(s) > Allowable Cw
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
RP for Limited Dataset (n<8 samples) - apply
Quarterly Monitoring
Page 17 of 19
26641 RPA 4.0 MGD, rpa
3/23/2022

Date: 3/23/2022
Dissolved to Total Metal Calculator
Do NOT enter any data directly into this spreadsheet.
Enter data onto "Table 1" under the Input Sheet and enter
"Effluent Hardness" under the Data Sheet.
In accordance with 40 CFR 122.45 (c ), permits are, have and
must be written as total metals.
This calculator has been inserted into the RPA to calculate
Total Metal allowable allocations once Table 1 has been
completed (Input Sheet) and Effluent hardness has been
entered (Data Sheet).
1) Following the spreadsheet from left to right.
First the allowable allocations for the dissolved metals
will appear for all the metals listed once Table 1 is
complete and effluent hardness entered. Use a default
value of 25 mg/L if no hardness data is available.
Second, the Dissolved Metal allocations are divided by
the Translators to determine the Total Metals that can be
allocated to the Permittee. These Total Metals values are
automatically inserted into Table 2 and are the allowable
Total Metal allocations determined for the Permittee
prior to allowing for dilution. See Input sheet Table 2. The
final acute and chronic values shown under the RPA sheet
are the Total Metal values listed in Table 2 divided by the
acute and chronic IWC, respectively.
2) The Translators used in the freshwater RPA are the
Partition Coefficients published by US EPA in 1984. They
are TSS dependent equations and can be found listed
with the WQS hardness dependent equations under the
sheet labeled Equations. A fixed TSS value of 10 mg/L is
used to calculate the Translator values.
3) Pretreatment Facilities - PERCS will need a copy of the
Dissolved to Total Metal Calculator spreadsheet and the
RPA sheet along with the Final Permit. Pretreatment
Facilities are required to renew their Headwords Analysis
after renewal of their permits. Since all their metal
allocations are likely to change PERCS needs to see any
new metal permit limits and the allowable allocations for
the dissolved metals to assess Maximum Allowable
Headworks Loading (MAHL) numbers for each metal
based on the Combined Hardness values used in the
permit writers RPA calculations.
4) For Cadmium, Lead, Nickel, Chromium and Beryllium, if
all the effluent sampling data for the last three to five
years shows the pollutant at concentrations less than the
Practical Quantitative Level (PQL), it is not likely a limit or
monitoring will be put in the permit. However, if the
estimated NPDES permit limit is less than the Practical
Quantitative Limit (particularly, Cadmium and Lead) and
the pollutant is believed to be present, to assess
compliance with the new standards and for future permit
limit development, monitoring for the pollutant will be
required. If the facility is monitoring for the pollutant in
its Pretreatment LTMP, no monitoring is needed in the
permit.
FACILITY: Siler City WWTP Outfall 001
NPDES PERMIT: NC0026441
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
summer
7Q10 (CFS)
Receiving
Stream
summer 7Q10
(MGD)
Rec. Stream
1Q10
[MGD]
NPDES
Flow Limit
[MGD]
Total Suspended
Solids
-Fixed Value-
(mg/L)
Combined
Hardness
chronic
(mg/L)
Combined
Hardness
Acute
(mg/L)
Instream
Wastewater
Concentration
(Chronic)
Instream
Wastewater
Concentration
(Acute)
Upstream
Hardness
Average (mg/L)
Effluent
Hardness
Average
(mg/L)
0.0900
I 0.0581
0.0516 6.0000 ,
10
94.960
95.020
99.0415
99.1471
I 39.2 j 95.5
PARAMETER
Cadmium (d)
Cd -Trout streams
Chromium Ill (d)(h)
Chromium VI (d)
Chromium, Total (t)
Copper (d)(h)
Lead (d)(h)
Nickel (d)(h)
Dissolved Metals Criteria
after applying hardness
equation
Chronic
Acute
[ug/I]
0.41
0.41
71
11
[ug/I]
2.62
US EPA
Translators- using
Default Partition
Coefficients
(streams)
0.252
Total Metal Criteria Total Metal =
Dissolved Metal = Translator
Chronic
Acute
Upstream Hard Avg (mg/L) =
EFF Hard Avg (mg/L) = 95.5
39.2
1.631 0.2521
546
16
8.6 12.8
2.38 61
Ni - WS streams (t)
Silver (d)(h,acute)
Zinc (d)(h)
50 448
0.06
113
2.95
112
0.202
1.000
0.348
0.184
0.432
1.000
0.288
[ug/I]
[ug/I]
1.62 10.38
1.62 6.45
351.23 2701.50
11.00 16.00
N/A
N/A
24.65
36.85
12.93
332.16
115.15
1037.26
25
N/A
0.06
2.95
392.63
389.66
Beryllium
Arsenic (d)
6.5 65 1.000
150 340 1.000
6
150
65
340
COMMENTS (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.
ACAH 95.01983
ACCH 94.96038

Facility Name
WWTP/WTP Class
NPDES Permit
Outfall
Flow, Qw (MGD)
Receiving Stream
HUC Number
Stream Class
Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators
MAXIMUM DATA POINTS = 58
REQUIRED DATA ENTRY
Table 1. Project Information
❑ CHECK IF HQW OR ORW WQS
Siler City WWTP
Grade IV
NC0026441
001
6.000
Loves Creek
03030003
❑ Apply WS Hardness WQC
7Q10s (cfs)
7Q1Ow (cfs)
30Q2 (cfs)
QA (cfs)
1 Q1 Os (cfs)
0.09
0.23
0.32
8.70
0.08
Effluent Hardness
95.5 mg/L (Avg)
Upstream Hardness
39.2 mg/L (Avg)
Combined Hardness Chronic
Combined Hardness Acute
94.96 mg/L
95.02 mg/L
Data Source(s)
❑ CHECK TO APPLY MODEL
Data from submitted DMRs and PPAs; Hardness
data provided by the permittee by request.
Streamflows updated by USGS per request in July
2021.
Table 2. Parameters of Concern
Par01
Par02
Par03
Par04
Par05
Par06
Par07
Par08
Par09
Par10
Par11
Par12
Par13
Par14
Par15
Par16
Par17
Par18
Par19
Par20
Par21
Par22
Par23
Par24
Name
WQS
Type Chronic Modifier
Acute
PQL Units
Arsenic
Aquactic Life
C
150
FW
340
ug/L
Arsenic
Human Health
Water Supply
C
10
HH/WS
N/A
ug/L
Beryllium
Aquatic Life
NC
6.5
FW
65
ug/L
Cadmium
Aquatic Life
NC
1.6162
FW
10.3806
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
351.2295
FW
2701.4991
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
24.6508
FW
36.8457
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
12.9350
FW
332.1605
ug/L
Mercury
Aquatic Life
NC
12
FW
0.5
ng/L
Molybdenum
Human Health
NC
2000
HH
ug/L
Nickel
Aquatic Life
NC
115.1469
FW
1037.2630
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
2.9462
ug/L
Zinc
Aquatic Life
NC
392.6345
FW
389.6554
ug/L
Chloroform
Human Health
NC
2000
HH
pg/L
Dichlorobromomethane
Human Health
C
27
HH
pg/L
Bis (2-ethylhexyl) phthalate
Human Health
C
0.37
HH
pg/L
26641 RPA 6.0 MGD, input
3/23/2022

Slier City WWTP
NC0026441
Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators
MAXIMUM DATA POINTS = 58
Qw (MGD) = 6.0000
1Q1OS (cfs) = 0.08
7Q1OS (cfs) = 0.09
7Q1OW (cfs) = 0.23
30Q2 (cfs) = 0.32
Avg. Stream Flow, QA (cfs) = 8.70
Receiving Stream: Loves Creek HUC 03030003
WWTP/WTP Class:
IWC% @ 1Q1OS =
IWC% @ 7Q1OS =
IWC% @ 7Q1OW =
IWC% @ 30Q2 =
IW%C @ QA =
Stream Class:
Grade IV
99.14712154
99.04153355
97.58656873
96.67359667
51.66666667
C
Outfall 001
Qw=6MGD
COMBINED HARDNESS (mg/L)
Acute = 95.02 mg/L
Chronic = 94.96 mg/L
PARAMETER
TYPE
NC STANDARDS OR EPA CRITERIA
_1
co
=
REASONABLE POTENTIAL RESULTS
RECOMMENDED ACTION
Chronic Applied Acute
Standard
11 # Det. Max Pred Cw Allowable Cw
Arsenic
Arsenic
_
C
C
150 FW(7Q10s) 340
10 EIH/WS(Qavg)
ug/L
ug/L
16 0
5.0
NO DETECTS
Acute (FW): 342.9
_ _ _ _ _____ _______________________________
Chronic (FW) 151.5
_Max_MDL = 10 ___
Chronic (HH): 19.4
Max MDL = 10
_ _ _ _ _ _ _ _ _ _ _ ____
No detects at < 10 ug/L. No monitoring or limits
required.
Beryllium
NC
6.5 FW(7Q10s) 65
ug/L'
3 0
Note: n < 9
Limited data set
7.50
C.V. (default)
NO DETECTS
Acute: 65.56
___ _ ______ ___
Chronic: 6.56
Max MDL = 5
_ _ _ _ _ _ _ _ _ _ _ _____
No detects at < 5 ug/L. No monitoring or limits
required.
Cadmium
NC
1.6162 FW(7Q10s) 10.3806
ug/L
48 2
3.090
Acute: 10.470
___ _ ______ ___
Chronic: 1.632
1 value(s) > Allowable Cw
_ _ _ _ _ _ _ _ _ _ _ _ ___
RP found based on 1 detect: 3 ug/L on 10/3/2019,
and many ND < 2 ug/L. Apply qtrly monitoring.
Chlorides
NC
230 FW(7Q10s)
mg/L
15 15
224.4
Acute: NO WQS
_ _ _ _ _ _ _ _ _ _ _ _
Chronic: 232.2
No value > Allowable Cw
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _
No RP , Predicted Max >_ 50% of Allowable Cw -
apply Quarterly Monitoring
Chlorinated Phenolic Compounds
NC
1 A(30Q2)
ug/L
0 0
N/A
Acute: NO WQS
-_ _ ----- _
--------------------------------
Chronic: 1.0
Total Phenolic Compounds
NC
300 A(30Q2)
ug/L
3 2
Note: n < 9
Limited data set
69.0
C.V. (default)
Acute: NO WQS
___ _ ____ _ ________________
Chronic: 310.3
No value > Allowable Cw
_______
No RP for limited dataset (n<8 samples)
Chromium III
NC
351.2295 FW(7Q10s) 2701.4991
µg/L
0 0
N/A
Acute: 2,724.7
-_ _ ---- _ _
-------------------------------
Chronic: 354.6
Chromium VI
NC
11 FW(7Q10s) 16
µg/L
0 0
N/A
Acute: 16.1
-_ _ ---- _ _
-------------------------------
Chronic: -11.1
Chromium, Total
NC
µg/L
17 0
2.5
NO DETECTS
Max reported value = 2.5
Max MDL = 5
a: No monitoring required if all Total Chromium
samples are < 5 pg/L or Pred. max for Total Cr is <
allowable Cw for Cr VI.
Page 3 of 6
26641 RPA 6.0 MGD, rpa
3/23/2022

Slier City WWTP
NC0026441
Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators
Outfall 001
Qw=6MGD
Copper
NC
24.6508 FW(7Q10s) 36.8457
ug/L
17 17
21.12
Acute: 37.16
_ _ _ _ _ _ _ _ _ _ _ _
Chronic: 24.89
No value > Allowable Cw
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _
No RP , Predicted Max >_ 50% of Allowable Cw -
apply Quarterly Monitoring
Cyanide
NC
5 FW(7Q10s) 22
10
ug/L
3 2
Note: n < 9
Limited data set
15.0
C.V. (default)
Acute: 22.2
___ _ ______ ___
Chronic: 5.0
No value > Allowable Cw
_ _ _ _ _ _ _ ___ _ _ _ ___
No value > 10 ug/L; all results < 10 ug/L considered
compliant due to analytical issues. No monitoring.
Fluoride
NC
1800 FW(7Q10s)
ug/L
0 0
N/A
Acute: NO WQS
-_ _ ---_ _
-------------------------------
Chronic: -1,817.4
Lead
NC
12.9350 FW(7Q10s) 332.1605
ug/L
17 0
5.000
NO DETECTS
Acute: 335.018
_ _ _ _ _ _ _ _ _ _ _ _
Chronic: 13.060
Max MDL = 10
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _
All nondetects at < 10 ug/L; no monitoring required.
Mercury
NC
12 FW(7Q10s)
0.5
ng/L
0 0
N/A
Acute: NO WQS
-- _ _ ------------------------------------
Chronic:12 1
Molybdenum
NC
2000 HH(7Q10s)
ug/L
17 0
2.5
NO DETECTS
Acute: NO WQS
___ _ ____ _ ___
Chronic: 2,019.4
Max MDL = 5
_ ___ _ _ _ _ _ _ _ _ _ ___
No RP, Predicted Max < 50% of Allowable Cw - No
Monitoring required
Nickel
Nickel
NC
NC
115.1469 FW(7Q10s) 1037.2630
25.0000 WS(7Q10s)
µg/L
µg/L
18 1
19.4
Acute (FW): 1,046.2
_ _ _ _ _ _ _ _ _ _ _
Chronic (FW): 116.3
No value > Allowable Cw
Chronic (WS): 25.2
No value > Allowable Cw
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _
All nondetects at < 10 ug/L with one detect of 29 ug/L
in 12/12/2017. No monitoring required.
Selenium
NC
5 FW(7Q10s) 56
ug/L
18 0
5.0
NO DETECTS
Acute: 56.5
___ _ ______ ___
Chronic: 5.0
Max MDL = 10
_ _ _ _ _ _ _ _ _ _ _ _ ___
All but one nondetects at < 10 ug/L; PQL = 1 ug/L.
Apply quarterly monitoring, test to lower level.
Silver
_
NC
0.06 FW(7Q10s) 2.9462
ug/L
3 0
Note: n < 9
Limited data set
7.500
C.V. (default)
NO DETECTS
Acute: 2.972
___ _ ____ _ ___
Chronic: 0.061
Max MDL = 5
_ _ _ _ _ _ _ _ _ _ _ _____
All nondetects < 5 ug/L; PQL = 1.0 ug/L. Apply
quarterly monitoring and test to lower limit.
Zinc
NC
392.6345 FW(7Q10s) 389.6554
ug/L
18 16
39.7
Acute: 393.0
_ _ _ _ _ _ _ _ _ _ _ _
Chronic: 396.4
No value > Allowable Cw
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
No RP, Predicted Max < 50% of Allowable Cw - No
Monitoring required
Chloroform
_
NC
2000 HH(7Q10s)
µg/L
3 2
Note: n < 9
Limited data set
20.76000
C.V. (default)
Acute: NO WQS
___ _ ____ _ _ ______________
Chronic: 2019.35484
No value > Allowable Cw
_______
No RP for limited dataset (n<8 samples)
Dichlorobromomethane
C
27 HH(Qavg)
µg/L
3 1
Note: n < 9
Limited data set
3.75000
C.V. (default)
Acute: NO WQS
___ _ ____ _ _ ______________
Chronic: 52.25806
No value > Allowable Cw
_______
No RP for limited dataset (n<8 samples)
Bis (2-ethylhexyl) phthalate
C
0.37 HH(Qavg)
µg/L
3 1
Note: n < 9
Limited data set
45.30000
C.V. (default)
Acute: NO WQS
_ _ _ _ _ _ _ _ _ _ _
Chronic: 0.71613
3 value(s) > Allowable Cw
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
RP for Limited Dataset (n<8 samples) - apply
Quarterly Monitoring
Page 4 of 6
26641 RPA 6.0 MGD, rpa
3/23/2022

Date: 3/23/2022
Dissolved to Total Metal Calculator
Do NOT enter any data directly into this spreadsheet.
Enter data onto "Table 1" under the Input Sheet and enter
"Effluent Hardness" under the Data Sheet.
In accordance with 40 CFR 122.45 (c ), permits are, have and
must be written as total metals.
This calculator has been inserted into the RPA to calculate
Total Metal allowable allocations once Table 1 has been
completed (Input Sheet) and Effluent hardness has been
entered (Data Sheet).
1) Following the spreadsheet from left to right.
First the allowable allocations for the dissolved metals
will appear for all the metals listed once Table 1 is
complete and effluent hardness entered. Use a default
value of 25 mg/L if no hardness data is available.
Second, the Dissolved Metal allocations are divided by
the Translators to determine the Total Metals that can be
allocated to the Permittee. These Total Metals values are
automatically inserted into Table 2 and are the allowable
Total Metal allocations determined for the Permittee
prior to allowing for dilution. See Input sheet Table 2. The
final acute and chronic values shown under the RPA sheet
are the Total Metal values listed in Table 2 divided by the
acute and chronic IWC, respectively.
2) The Translators used in the freshwater RPA are the
Partition Coefficients published by US EPA in 1984. They
are TSS dependent equations and can be found listed
with the WQS hardness dependent equations under the
sheet labeled Equations. A fixed TSS value of 10 mg/L is
used to calculate the Translator values.
3) Pretreatment Facilities - PERCS will need a copy of the
Dissolved to Total Metal Calculator spreadsheet and the
RPA sheet along with the Final Permit. Pretreatment
Facilities are required to renew their Headwords Analysis
after renewal of their permits. Since all their metal
allocations are likely to change PERCS needs to see any
new metal permit limits and the allowable allocations for
the dissolved metals to assess Maximum Allowable
Headworks Loading (MAHL) numbers for each metal
based on the Combined Hardness values used in the
permit writers RPA calculations.
4) For Cadmium, Lead, Nickel, Chromium and Beryllium, if
all the effluent sampling data for the last three to five
years shows the pollutant at concentrations less than the
Practical Quantitative Level (PQL), it is not likely a limit or
monitoring will be put in the permit. However, if the
estimated NPDES permit limit is less than the Practical
Quantitative Limit (particularly, Cadmium and Lead) and
the pollutant is believed to be present, to assess
compliance with the new standards and for future permit
limit development, monitoring for the pollutant will be
required. If the facility is monitoring for the pollutant in
its Pretreatment LTMP, no monitoring is needed in the
permit.
FACILITY: Siler City WWTP Outfall 001
NPDES PERMIT: NC0026441
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
summer
7Q10 (CFS)
Receiving
Stream
summer 7Q10
(MGD)
Rec. Stream
1Q10
[MGD]
NPDES
Flow Limit
[MGD]
Total Suspended
Solids
-Fixed Value-
(mg/L)
Combined
Hardness
chronic
(mg/L)
Combined
Hardness
Acute
(mg/L)
Instream
Wastewater
Concentration
(Chronic)
Instream
Wastewater
Concentration
(Acute)
Upstream
Hardness
Average (mg/L)
Effluent
Hardness
Average
(mg/L)
0.0900
I 0.0581
0.0516 6.0000
10
94.960
95.020
99.0415
99.1471
I 39.2 j 95.5
PARAMETER
Cadmium (d)
Cd -Trout streams
Chromium Ill (d)(h)
Chromium VI (d)
Chromium, Total (t)
Copper (d)(h)
Lead (d)(h)
Nickel (d)(h)
Dissolved Metals Criteria
after applying hardness
equation
Chronic
Acute
[ug/I]
0.41
0.41
71
11
[ug/I]
2.62
US EPA
Translators- using
Default Partition
Coefficients
(streams)
0.252
Total Metal Criteria Total Metal =
Dissolved Metal = Translator
Chronic
Acute
Upstream Hard Avg (mg/L) =
EFF Hard Avg (mg/L) = 95.5
39.2
1.631 0.2521
546
16
8.6 12.8
0.202
1.000
0.348
[ug/I]
[ug/I]
1.62 10.38
1.62 6.45
351.23 2701.50
11.00 16.00
N/A
N/A
24.65
36.85
Ni - WS streams (t)
Silver (d)(h,acute)
Zinc (d)(h)
2.38 61
50 448
0.06
113
2.95
112
0.1841
0.432
12.93
115.15
332.16
1037.26
25
N/A
1.0001 0.06
0.2881 392.63
2.95
389.66
Beryllium
Arsenic (d)
6.5 65 1.000
150 340 1.000
6
150
65
340
COMMENTS (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.
ACAH 95.01983
ACCH 94.96038

Permit No. NC0026441
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 Quality Standards/Aquatic Life Protection
Parameter
Acute FW, µg/1
(Dissolved)
Chronic FW, µg/1
(Dissolved)
Acute SW, 1.1g/1
(Dissolved)
Chronic SW, µg/1
(Dissolved)
Arsenic
340
150
69
36
Beryllium
65
6.5
---
---
Cadmium
Calculation
Calculation
40
8.8
Chromium III
Calculation
Calculation
---
---
Chromium VI
16
11
1100
50
Copper
Calculation
Calculation
4.8
3.1
Lead
Calculation
Calculation
210
8.1
Nickel
Calculation
Calculation
74
8.2
Silver
Calculation
0.06
1.9
0.1
Zinc
Calculation
Calculation
90
81
Table 1 Notes:
1. FW= Freshwater, SW= Saltwater
2. Calculation = Hardness dependent standard
3. Only the aquatic life standards listed above are expressed in dissolved form. Aquatic life
standards for Mercury and selenium are still expressed as Total Recoverable Metals due to
bioaccumulative concerns (as are all human health standards for all metals). It is still necessary
to evaluate total recoverable aquatic life and human health standards listed in 15A NCAC
2B.0200 (e.g., arsenic at 10 µg/1 for human health protection; cyanide at 5 µg/L and fluoride at
1.8 mg/L for aquatic life protection).
Table 2. Dissolved Freshwater Standards for Hardness -Dependent Metals
The Water Effects Ratio (WER) is equal to one unless determined otherwise under 15A
NCAC 02B .0211 Subparagraph (11)(d)
Metal
NC Dissolved Standard, µg/I
Cadmium, Acute
WER*{1.136672-[ln hardness](0.041838)} • e^{0.9151 [In hardness]-3.1485}
Cadmium, Acute Trout waters
WER*{1.136672-[ln hardness](0.041838)} • e^{0.9151[ln hardness]-3.6236}
Cadmium, Chronic
WER* { 1.101672-[ln hardness](0.041838)} • e^ {0.7998[ln hardness]-4.4451 }
Chromium III, Acute
WER*0.316 • e^{0.8190[ln hardness]+3.7256}
Chromium III, Chronic
WER*0.860 • e^{0.8190[ln hardness]+0.6848}
Copper, Acute
WER*0.960 • e^{0.9422[ln hardness]-1.700}
Copper, Chronic
WER*0.960 • e^{0.8545[ln hardness]-1.702}
Lead, Acute
WER*{1.46203-[ln hardness](0.145712)} • e^{1.273[In 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. NC0026441
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[In 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/WQBELs for Hardness -Dependent Metals - Freshwater
The RPA is designed to predict the maximum likely effluent concentrations for each metal of concern,
based on recent effluent data, and calculate the allowable effluent concentrations, based on applicable
standards and the critical low -flow values for the receiving stream.
If the maximum predicted value is greater than the maximum allowed value (chronic or acute), the
discharge has reasonable potential to exceed the standard, which warrants a permit limit in most cases. If
monitoring for a particular pollutant indicates that the pollutant is not present (i.e. consistently below
detection level), then the Division may remove the monitoring requirement in the reissued permit.
1. To perform a RPA on the Freshwater hardness -dependent metals the Permit Writer compiles the
following information:
• Critical low flow of the receiving stream, 7Q10 (the spreadsheet automatically calculates
the 1Q10 using the formula 1Q10 = 0.843 (s7Q10, 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. NC0026441
The overall hardness value used in the water quality calculations is calculated as follows:
Combined Hardness (chronic)
= (Permitted Flow, cfs *Avg. Effluent Hardness, mg/L) + (s7Q10, cfs *Avg. Upstream Hardness, mg/L)
(Permitted Flow, cfs + s7Q10, cfs)
The Combined Hardness for acute is the same but the calculation uses the 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 = 1
Ctotal 1 + { [Kpo] [ SS( i+a)] [10-6] }
Where:
ss = in -stream suspended solids concentration [mg/1], minimum of 10 mg/L used,
and
Kpo and a = constants that express the equilibrium relationship between dissolved
and adsorbed forms of metals. A list of constants used for each hardness -dependent
metal can also be found in the RPA program under a sheet labeled DPCs.
4. The numeric standard for each metal of concern is divided by the default partition coefficient (or
site -specific translator) to obtain a Total Recoverable Metal at ambient conditions.
In some cases, where an EPA default partition coefficient translator does not exist (ie. silver), the
dissolved numeric standard for each metal of concern is divided by the EPA conversion factor to
obtain a Total Recoverable Metal at ambient conditions. This method presumes that the metal is
dissolved to the same extent as it was during EPA's criteria development for metals. For more
information on conversion factors see the June, 1996 EPA Translator Guidance Document.
5. The RPA spreadsheet uses a mass balance equation to determine the total allowable concentration
(permit limits) for each pollutant using the following equation:
Ca = (s7Q10 + Qw) (Cwqs) — (s7Q10) (Cb)
Qw
Where: Ca = allowable effluent concentration (µg/L or mg/L)
Cwqs = NC Water Quality Standard or federal criteria (µg/L or mg/L)
Cb = background concentration: assume zero for all toxicants except NH3* (µg/L or mg/L)
Qw = permitted effluent flow (cfs, match s7Q10)
s7Q 10 = summer low flow used to protect aquatic life from chronic toxicity and human
health through the consumption of water, fish, and shellfish from noncarcinogens (cfs)
* Discussions are on -going with EPA on how best to address background concentrations
Flows other than s7Q10 may be incorporated as applicable:
1Q10 = used in the equation to protect aquatic life from acute toxicity
Page 3 of 4

Permit No. NC0026441
QA = used in the equation to protect human health through the consumption of water,
fish, and shellfish from carcinogens
30Q2 = used in the equation to protect aesthetic quality
6. The permit writer enters the most recent 2-3 years of effluent data for each pollutant of concern.
Data entered must have been taken within four and one-half years prior to the date of the permit
application (40 CFR 122.21). The RPA spreadsheet estimates the 95th percentile upper
concentration of each pollutant. The Predicted Max concentrations are compared to the Total
allowable concentrations to determine if a permit limit is necessary. If the predicted max exceeds
the acute or chronic Total allowable concentrations, the discharge is considered to show
reasonable potential to violate the water quality standard, and a permit limit (Total allowable
concentration) is included in the permit in accordance with the U.S. EPA Technical Support
Document for Water Quality -Based Toxics Control published in 1991.
7. When appropriate, permit writers develop facility specific compliance schedules in accordance
with the EPA Headquarters Memo dated May 10, 2007 from James Hanlon to Alexis Strauss on
40 CFR 122.47 Compliance Schedule Requirements.
8. The Total Chromium NC WQS was removed and replaced with trivalent chromium and
hexavalent chromium Water Quality Standards. As a cost savings measure, total chromium data
results may be used as a conservative surrogate in cases where there are no analytical results
based on chromium III or VI. In these cases, the projected maximum concentration (95th %) for
total chromium will be compared against water quality standards for chromium III and
chromium VI.
9. Effluent hardness sampling and instream hardness sampling, upstream of the discharge, are
inserted into all permits with facilities monitoring for hardness -dependent metals to ensure the
accuracy of the permit limits and to build a more robust hardness dataset.
10. Hardness and flow values used in the Reasonable Potential Analysis for this permit included:
Parameter
Value
Comments (Data Source)
Average Effluent Hardness, mg/L
(Total as CaCO3)
95.8
Data provided by Permittee
Average Upstream Hardness, mg/L
(Total as CaCO3)
39.2
Data provided by Permitte
7Q10 summer (cfs)
0.25
Reported in previous permit Fact
Sheet
1Q10 (cfs)
0.21
Calculated in RPA spreadsheet
Permitted Flow (MGD)
4.0/6.0
Design flow/expansion tier
Date: May 7, 2021
Permit Writer: Gary Perlmutter
Page 4 of 4

Siler City WWTP / NC0026441
Mercury Data Statistics (Method 1631E)
2017
2018
2019
2020
# of Samples
1
4
4
3
Annual Average, ng/L
2.0
10.0
2.8
5.2
Maximum Value, ng/L
1.95
30.00
4.47
12.70
TBEL, ng/L
47
WQBEL, ng/L
6.2

3/23/22 WQS = 6 ng/L
Facility Name Siler City WWTP / NC0026441
/Permit No. :
MERCURY WQBEL/TBEL EVALUATION V:2013-6
Total Mercury 1631E PQL = 0.5 ng/L 7Q10s =
Date Modifier Data Entry Value Permitted Flow =
12/12/17
3/20/18
6/12/18
9/11/18
12/18/18
2/14/19
6/11/19
9/10/19
12/10/19
3/10/20
6/9/20
9/14/20
1.95
1.16
5.24
30
3.54
4.47
3.8
2.25
1
1.69
12.7
1.16
FALSE
MMP Required
1.95
1.16
5.24
30
3.54
4.47
3.8
2.25
0.5
1.69
12.7
1.16
0.250
4.000
cfs
WQBEL =
6.24 ng/L
47 ng/L
2.0 ng/L - Annual Average for 2017
WQBEL< 10.0 ng/L - Annual Average for 2018
2.8 ng/L - Annual Average for 2019
5.2 ng/L - Annual Average for 2020

Siler City WWTP / NC0026441
Mercury Data Statistics (Method 1631E)
2018
2019
2020
2021
# of Samples
4
4
4
5
Annual Average, ng/L
10.0
2.8
4.0
1.0
Maximum Value, ng/L
30.00
4.47
12.70
3.15
TBEL, ng/L
47
WQBEL, ng/L
12.1

3/23/22 WQS = 12 ng/L
Facility Name Slier City WWTP / NC0026441
/Permit No. :
MERCURY WQBEL/TBEL EVALUATION V:2013-6
Total Mercury 1631E PQL = 0.5 ng/L 7Q10s =
Date Modifier Data Entry Value Permitted Flow =
3/20/18 1.16
6/12/18 5.21
9/11/18 30
12/18/18 3.54
2/14/19 4.47
6/11/19 3.8
9/10/19 2.25
12/10/19 < 1
3/10/20 1.69
6/9/20 12.7
9/14/20 1.16
12/8/20 < 1
1/8/21 < 1
3/8/21 < 1
6/22/21 3.15
9/14/21 < 1
12/9/21 < 1
No Limit Required
MMP Required
1.16
5.21
30
3.54
4.47
3.8
2.25
0.5
1.69
12.7
1.16
0.5
0.5
0.5
3.15
0.5
0.5
0.090
6.000
cfs
WQBEL =
12.12 ng/L
47 ng/L
10.0 ng/L - Annual Average for 2018
2.8 ng/L - Annual Average for 2019
4.0 ng/L - Annual Average for 2020
1.0 ng/L - Annual Average for 2021

1obun of iter Cap
Public Works and Utilities
February 19, 2021
ANNUAL PRETREATMENT REPORT NARRATIVE
NOTICE OF NONCOMPLIANCE
Brookwood Farms, Inc. — I.U. 003
Brookwood Farms, Inc. did not have any violations through the Town's monitoring program for the 2020
year.
Mountaire Farms, Inc. — I.U. 004
Mountaire Farms, Inc. had one violation through the Town's monitoring program for the 2020 year.
This violation was for failure to report weekly BOD for 06/30/2020.
Brookwood Farms and Mountaire Farms were issued new pretreatment permits 01/01/2021 and will
expire at midnight 12/31/2025.
HWA is due this year and will be updated to include Mountaire Farms.
There are currently eight dental offices within the Town of Siler City's collection system. Letters along
with a one-time compliance report and a dental mercury survey were mailed out 04/30/2020. As of
02/01/2021 only three have filled out and return their forms. Since dental offices were closed most of
the year because of Covid, I plan to resend these forms again 04/30/2021.
Chris McCorquodale
Director of Public Works and Utilities
Town of Siler City
Chris McCorquodale
WWTP Superintendent
PO Box 769. 198 Utility Drive
Siler City, NC 27344-0769
[e-mail]
Phone: [phone] • Fax: [phone]
www.silercity.org
To advance a framework for our success through balanced governance, dynamic partnerships, and an engaged community.

Reduction in Frequency Evalaution
Facility:
Siler City WWTP
Permit No.
NC0026441
Review period (use 3
yrs)
02/2018 - 01/2022
Approval Criteria:
Y/N?
1. Not currently under SOC
Y
2. Not on EPA Quarterly noncompliance report
N
3. Facility or employees convicted of CWA
violations
N
Weekly
average limit
Monthly
average
limit
50%
MA
3-yr mean
(geo mean
for FC)
< 50%?
200%
MA
# daily
samples
> 200%
< 15?
200%
WA
# daily
samples
>200%
< 20?
# of non -
monthly
limit
violations
> 27
# civil penalty
asessment
> 1?
Reduce
Frequency?
(Yes/No)
BOD (Weighted)
mg/L
12.08
6.04
3
2.49
Y
12.1
21
N
7
Y
0
N
N
TSS
mg/L
45
30
15
1.04
Y
60
0
Y
0
N
0
N
N
Ammonia (weighted)
mg/L
18
6
3
0.40
Y
12
0
Y
7
Y
1
N
N
Fecal Coliform
#/100
400
200
100
10.57
Y
800
8
Y
1
N
0
N
N
Y/N
Y/N
Y/N
**From Y/N **From BIMS Y/N
BIMS

3/22/22, 1:31 PM Detailed Facility Report I ECHO I US EPA
ECH
Enforcement and
Compliance History Online
Detailed Facility Report
Facility Summary
SILER CITY WWTP
NCSR 1363 US HWY 64, SILER CITY, NC 27344
FRS (Facility,,,Registry,,,Seryi. ID: 110040028332
EPA Region: 04
Latitude: 35.760856
Longitude: -79.462201
Locational Data Source: FRS
Industries: --
Indian Country: N
Enforcement and Compliance Summary
Statute
Compliance Monitoring Activities (5 years)
Date of Last Compliance Monitoring Activity
5
09/29/2021
Compliance Status .ignificant/Category I Noncompliance
Qtrs in Noncompliance (of 12)
Qtrs with Significant Violation
Informal Enforcement Actions (5 years)
Formal Enforcement Actions (5 years)
Penalties from Formal Enforcement Actions (5 years)
EPA Cases (5 years)
Penalties from EPA Cases (5 years)
Regulatory Information
Other Regulatory Reports
12
5
25
16
$115,427
Clean Air Act (CAA): No Information Air Emissions Inventory (EIS): No Information
Clean Water Act (CWA): Major, Permit Expired (NC0026441), Minor, Permit Effective (NCL026441) Greenhouse Gas Emissions (eGGRT): No Information
Resource Conservation and Recovery Act (RCRA): No Information Toxic Releases (TRI): No Information
Safe Drinking Water Act (SDWA): No Information Compliance and Emissions Data Reporting Interface (CEDRI):
No Information
https://echo.epa.gov/detailed-facility-report?fid=110040028332
1/7

3/22/22, 1:31 PM Detailed Facility Report I ECHO I US EPA
Go To Enforcement/Compliance Details
Known Data Problems
Facility/System Characteristics
Facility/System Characteristics
i
FRS
Statute
ICIS-NPDES CWA
ICIS-NPDES CWA
Facility Address
Identifier mil Universe
110040028332 I
NC0026441 Major: NPDES Individual Permit
NCL026441 Minor: Associated Permit Record
Status '
Expired
Effective
Areas
Biosolids, POTW, Pretreatment
Biosolids
.■ Permit Expiration Date Indian Country Latitude Longitude
N 35.760856 -79.462201
05/31/2019 N 35.729722 -79.428056
12/31/2025 N 35.760856 -79.462201
System -
FRS
ICIS-NPDES
Statute
CWA
Identifier
110040028332
NC0026441
I. Facility Name
ICIS-NPDES
CWA
NCL026441
SILER CITY WWTP
SILER CITY WWTP
TOWN OF SILER CITY
I I
NCSR 1363 US HWY 64, SILER CITY, NC 27344
Facility Address
370 WASTE TREATMENT PLANT RD, SILER CITY, NC 27344
_■ Facility County
Chatham County
PO BOX 769, SILER CITY, NC 27344
Chatham County
Chatham County
Facility SIC (StandardInd.tstrial,Classification) Codes
System
ICIS-NPDES
NPDES
Identifier
NC0026441
NC0026441
Facility Industrial Effluent Guidelines
SIC Code
4952
4952
- SIC Description
Sewerage Systems
Sewerage Systems
Identifier Effluent Guideline (40 CFR Part)
NC0026441 401
Effluent Guideline Description
General provisions
Enforcement and Compliance
Compliance Monitoring History (5 years)
Facility NAICS „(North American Industry Classification System) Codes
...............
nys=em
Identifier
Facility Tribe Information
NAICS Code
No data records returned
Reservation Name
Tribe Name
EPA Tribal ID
No data records returned
NAICS Description
Distance to Tribe (miles)
Statute
CWA
Source ID' _ System
NC0026441 ICIS-NPDES
CWA
CWA
CWA
CWA
NC0026441
NC0026441
NC0026441
NC0026441
CWA
NC0026441
ICIS-NPDES
ICIS-NPDES
ICIS-NPDES
ICIS-NPDES
Activity Type
Inspection/Evaluation
Inspection/Evaluation
Inspection/Evaluation
Inspection/Evaluation
ICIS-NPDES
Inspection/Evaluation
Inspection/Evaluation
Compliance Monitoring Type
Base Program - Audit
Base Program - Evaluation
Base Program - Sampling
Base Program - Reconnaissance without Sampling
Base Program - Evaluation
Base Program - Biomonitoring
Lead Agency
State
State
09/29/2021
State
State
State
08/24/2020
07/21/2020
06/03/2020
05/10/2019
State
03/12/2019
Finding (if applicable)
Entries in italics are not counted in EPA compliance monitoring strategies or annual results.
Compliance Summary Data
Statute
CWA
CWA
Source ID Current SNC.(SignifcantNoncompliance)/HPV (n)gh Pr iority_Viniation)
NC0026441
NCL026441
Yes
No
Current As Of
12/31/2021
12/31/2021
Qtrs with NC (N9pcomliance) (of 12)
12
0
Data Last Refreshed
03/18/2022
03/18/2022
Three -Year Compliance History by Quarter
https://echo.epa.gov/detailed-facility-report?fid=110040028332 2/7

3/22/22, 1:31 PM Detailed Facility Report I ECHO I US EPA
Statute Progrem/Pallutant/Vloletlon Type QTR 1 QTR 2 QTR 3 QTR 4 QTR S QTR 6 QTR 7 QTR S
CWA (Source ID: NC0026441) 01/01-03/31/19 04/01-06/30/19 07/01-09/30/19 10/01-12/31/19 01/01-03/31/20 04/01-06/30/20 07/01-09/30/20 10/01-12/31/20
Facility -Level Status Violation Violation Violation Violation Violation Significant/Category Violation
Identified Identified Identified Identified Identified I Noncompliance Identified
Quarterly Noncompliance Report Reportable Reportable Reportable Reportable Reportable Effluent - Monthly Reportable Resolved
History Noncompliance Noncompliance Noncompliance Noncompliance Noncompliance Average Limit Noncompliance
Pollutant Disch Mon Freq
Point Loc
CWA
BOD 5-
day 20
deg. C 001 - Effluent Mthly
M Gross
BOD, 5-
day:0
► CWA deg. C
Cadmium
total Im
CWA
CWA
►CWA
Coliform
fecal MF,
MFC
broth, 44.5
C
Coliform
fecal MF,
MFC
broth, 44.5
C
001 - Effluent NMth
M Gross
001 - Effluent Mthly
M Gross
001 - Effluent
M Gross
001 - Effluent
M Gross
Flow in
conduit or
thru
► CWA treatment 001 - Effluent
plant M Gross
Mthly
NMth
Mthly
43%
130%
116%
1220%
44%
QTR 9
01/01-03/31/21
QTR 10
04/01-06/30/21
QTR 11
07/01-09/30/21
Significant/Category
I Noncompliance
Significant/Category
I Noncompliance
Significant/Category
I Noncompliance
QTR 12
10/01-12/31/21
Significant/Category
I Noncompliance
Effluent - Monthly Effluent - Monthly Effluent - Monthly Effluent - Monthly
Average Limit Average Limit Average Limit Average Limit
QTR 13+
01/01-03/18/22
Violation
Identified
146% 14% 197% 12% 71%
132%
253%
37% 188%
55%
876% 505%
16%
Nitrogen,
ammonia
total Im 001 - Effluent
CWA d M Gross Mthly 40% 381% 874% 1% 1093% 618%
Nitrogen,
ammonia
► CWA total as
CWA
CWA
Solids,
total
sus ended
001 - Effluent NMth
M Gross
001 - Effluent NMth
M Gross
Single Event Violations Agency
Permit Violations - State
Unapproved Operation
195% 41% 265% 103%
06/03/2020
474%
163% 348%
134%
https://echo.epa.gov/detailed-facility-report?fid=110040028332 3/7

3/22/22, 1:31 PM Detailed Facility Report I ECHO I US EPA
Statute Program/Pollutant/Violation Type
CWA
Permit Violations -
Unapproved Operation
State
Late or Missing Discharge
Monitoring Report (DMR)
Measurements
QTR1 QTR2 QTR3 QTR4 QTR5 QTR6
QTR 10 QTR 11 QTR 12 J
09/29/2021
QTR 13+
I Counts of Late DMR Measurements 3 3 33 3 3
3 3
CWA (Source ID: NCL026441) 01/01-03/31/19 04/01-06/30/19 07/01-09/30/19 10/01-12/31/19 01/01-03/31/20 04/01-06/30/20 07/01-09/30/20 10/01-12/31/20 01/01-03/31/21 04/01-06/30/21 07/01-09/30/21 10/01-12/31/21 01/01-03/18/22
Facility -Level Status
Quarterly Noncompliance Report
History
P No Violation No Violation No Violation No Violation No Violation No Violation No Violation No Violation No Violation No Violation No Violation No Vr
Identified Identified Identified Identified Identified Identified Identified Identified Identified Midentified I
Undetermined
Informal Enforcement Actions (5 Years)
Statute
CWA
CWA
CWA
CWA
CWA
CWA
CWA
CWA
CWA
CWA
System
ICIS-NPDES
ICIS-NPDES
ICIS-NPDES
ICIS-NPDES
ICIS-NPDES
ICIS-NPDES
ICIS-NPDES
ICIS-NPDES
ICIS-NPDES
ICIS-NPDES
Source ID Type of Action Lead Agency
NC0026441 Base Program - Notice of Violation State
NC0026441 Base Program - Notice of Violation State
NC0026441 Base Program - Notice of Violation State
NC0026441 Base Program - Notice of Violation State
NC0026441 Base Program - Notice of Violation State
NC0026441 Base Program - Notice of Violation State
NC0026441 Base Program - Notice of Violation State
NC0026441 Base Program - Notice of Violation State
NC0026441 Base Program - Notice of Violation State
NC0026441 Base Program - Notice of Violation State
CWA
ICIS-NPDES
NC0026441 Base Program - Notice of Violation State
CWA
ICIS-NPDES
NC0026441 Base Program - Notice of Violation State
CWA
CWA
CWA
CWA
CWA
ICIS-NPDES
ICIS-NPDES
ICIS-NPDES
ICIS-NPDES
ICIS-NPDES
CWA
CWA
CWA
CWA
CWA
CWA
CWA
ICIS-NPDES
ICIS-NPDES
ICIS-NPDES
ICIS-NPDES
ICIS-NPDES
ICIS-NPDES
ICIS-NPDES
CWA ICIS-NPDES
NC0026441 Base Program - Notice of Violation State
NC0026441 Base Program - Notice of Violation State
NC0026441 Base Program - Notice of Violation State
NC0026441 Base Program - Notice of Violation State
NC0026441 Base Program - Notice of Violation State
NC0026441 Base Program - Notice of Violation State
NC0026441 Base Program - Notice of Violation State
NC0026441 Base Program - Notice of Violation State
NC0026441 Base Program - Notice of Violation State
NC0026441 Base Program - Notice of Violation State
NC0026441 Base Program - Notice of Violation State
NC0026441 Base Program - Notice of Violation State
NC0026441 Base Program - Notice of Violation State
Date
02/24/2022
12/10/2021
11/15/2021
11/09/2021
11/01/2021
10/13/2021
09/30/2021
06/01/2021
05/26/2021
12/29/2020
09/22/2020
08/11/2020
07/29/2020
07/14/2020
06/15/2020
05/06/2020
02/05/2020
09/27/2019
09/17/2019
02/26/2019
04/13/2018
02/09/2018
02/06/2018
01/25/2018
07/13/2017
Entries in italics are not counted as "informal enforcement actions" in EPA policies pertaining to enforcement response tools.
Formal Enforcement Actions (5 Years)
Statute
CWA
CWA
CWA
System Law/Section Si
ICIS-
NPDES
ICIS-
L NPDES
ICIS-
NPDES
OTHER NPDES/NC0026441
OTHER NPDES/NC0026441
OTHER NPDES/NC0026441
Type of Action
Administrative -
Formal
Administrative -
Formal
Administrative -
Formal
I Lead
Agency
NC-LV-2022- State
0041
NC-LV 2021-
0342
NC-LV-2021-
0341
State
State
Case Name
Town of Siler
City
Town of Siler
City
Town of Siler
City
I_
Ie Settlement/Action
ed/Filed Settlements/Actions
Date
Date
02/21/2022
12/15/2021
12/15/2021
02/21/2022
12/15/2021
1 12/15/2021
Federal Penalty
Assessed
SO
$0
$0
State/Local Penalty Penalty Amount SEP Comp Action
Assessed Collected Cost Cost
$18,044
$16,294
$0 SO
$0 SO
$10,044 -- $0 $0
https://echo.epa.gov/detailed-facility-report?fid=110040028332 4/7

3/22/22, 1:31 PM
Detailed Facility Report I ECHO I US EPA
Statute System Law/Section Source ID
CWA
CWA
ICIS-
NPDES
ICIS-
NPDES
CWA
ICIS-
NPDES
CWA
ICIS-
NPDES
CWA
CWA
CWA
ICIS-
NPDES
ICIS-
NPDES
ICIS-
NPDES
CWA
CWA
ICIS-
NPDES
ICIS-
NPDES
CWA
CWA
CWA
ICIS-
NPDES
ICIS-
NPDES
ICIS-
NPDES
OTHER I NPDES/NC0026441
OTHER NPDES/NC0026441
OTHER NPDES/NC0026441
OTHER I NPDES/NC0026441
OTHER NPDES/NC0026441
OTHER NPDES/NC0026441
OTHER NPDES/NC0026441
OTHER NPDES/NC0026441
OTHER NPDES/NC0026441
OTHER NPDES/NC0026441
OTHER NPDES/NC0026441
OTHER I NPDES/NC0026441
Type of Action
Administrative -
Formal
Administrative -
Formal
Administrative -
Formal
Administrative -
Formal
Administrative -
Formal
Case No.
NC-LV 2021-
0338
Lead
Agency
State
NC-LV 2021-
0339
NC-LV 2021-
0279
NC-PC-2020-
0045
NC-LV 2021-
0031
Administrative -
Formal
Administrative -
Formal
Administrative -
Formal
Administrative -
Formal
NC-LV 2020-
0338
NC-LV 2020-
0294
NC-LV 2020-
0292
NC-LV 2020-
0194
Administrative - NC-LV 2020-
Formal 0127
State
State
State
State
Case Name
Town of Siler
City
Town of Siler
City
Town of Siler
City
Town of Suter
City
Town of Slier
City
Issued/Filed
Date
11/22/2021
11/22/2021
11/15/2021
08/27/2021
02/15/2021
Settlements/Actions
l
1
1
1
Settlement/Action Federal Penalty State/Local Penalty Penalty Amount SEP Comp Action
Date Assessed Assessed Collected Cost Cost
11/22/2021
11/22/2021
11/15/2021
08/27/2021
02/15/2021
State
State
State
State
State
Administrative - NC-LV 2018-
Formal 0193
Administrative - NC-LV 2018-
Formal 0084
State
State
Town of Siler
City
11/23/2020
Town of Siler
City
Town of Siler
City
Town of Suter
City
Town of Siler
City
10/19/2020
10/12/2020
07/15/2020
07/01/2020
Town of Siler
City
08/08/2018
1
1
11/23/2020
1
1
10/19/2020
10/12/2020
07/15/2020
07/01/2020
08/08/2018
Town of Siler
City
04/13/2018
1
04/13/2018
$0
$0
$0
$0
$0
$0
$0
$0
$0
$0
$0
$0
$6,919
$981
$18,481
$20,044
$1,544
$8,544
$4,292
$2,542
$1,542
$1,542
$1,538
$1,538
$0
$0
$0
$0
$0
$0
$0
$0
$0
$0
$0
$0
$0
$0
$0
$0
$0
$0
$0
$0
$0
$0
$0
$0
CWA ICIS-
NPDES
OTHER NPDES/NC0026441 Administrative -
Formal
Environmental Conditions
Watersheds
NC-LV 2018-
0075
State
Town of Siler
City
04/12/2018
04/12/2018
$0
$1,538
$0
$0
12-Digit WBD,(Watershed Boundary Dataset) HUC
(RAD (Reach Address Database))
......................
030300030502
030300030503
WBD (WatershedBoundary„Dataset) Subwatershed
Name each s Database Address
(BAD (R......... ......................))
State Water Body Name (ICIS(Integrated
Compliance Information System))
Beach Closures
Within Last Year
Lacys Creek -Rocky River -- No
Loves Creek -Rocky River LOVES CREEK
No
Beach Closures Within
Last Two Years
No
No
Pollutants Potentially
Related to Impairment
BOD, 5-day, 20 deg. C
Oxygen, dissolved (DO)
Watershed with ESA (Endangered Species
Act) -listed Aquatic Species?
Yes
Ycs
Assessed Waters From Latest State Submission (ATTAINS)
State Report Cycle
NC 2020
NC
2020
NC
2020
Assessment Unit ID
NC17-43-10b1
NC 17-43-10c
NC 17-43-10b2
Assessment Unit Name
Loves Creek
Loves Creek
Loves Creek
Water Condition
Cause Groups Impaired ■
Impaired - 303(d) Listed - With Restoration Plan ORGANIC ENRICHMENT/OXYGEN DEPLETION
Impaired - 303(d) Listed - With Restoration Plan
Impaired - 303(d) Listed - With Restoration Plan
CAUSE UNKNOWN - IMPAIRED BIOTA
CAUSE UNKNOWN - IMPAIRED BIOTA
Drinking Water Use Aquatic Life
-- Not Supporting
-- Not Supporting
-- Not Supporting
Fish Consumption Use
Fully Supporting
Recreation Use
Insufficient Information
Insufficient Information
Other Use
Fully Supporting
Air Quality Nonattainment Areas
Within Nonattainment Status Area?
Nonattainment Status Applicable Standard(s) Within Maintenance Status Area?
No data records returned
Pollutants
Toxics Release Inventory History of Reported Chemicals Released in Pounds per Year at Site
Maintenance Status Applicable Standard(s)
TRI Facility ID Year Total Air Emissions Surface Water Discharges Off -Site Transfers to POTWs.(Ppbltcly_Owned t:gatmeat-Works) Underground Injections Releases to Land Total On -Site Releases Total Off -Site Transfers
No data records returned
https://echo.epa.gov/detailed-facility-report?fid=110040028332 5/7

3/22/22, 1:31 PM
Toxics Release Inventory Total Releases and Transfers in Pounds by Chemical and Year
Detailed Facility Report I ECHO I US EPA
Chemical Name
Community
EJSCREEN EJ Indexes
No data records returned
Eleven environmental justice (EJ) indexes of EJSCREEN, EPA's screening tool for EJ concerns. EPA uses these indexes to identify geographic areas that may warrant further consideration or analysis for potential EJ concerns. The index
values below are for the Census block group in which the facility is located. Note that use of these indexes does not designate an area as an "EJ community" or "EJ facility." EJSCREEN provides screening level indicators, not a
determination of the existence or absence of EJ concerns. For more information, see the EJSCREEN home page.
Census Block Group EJ Indexes (percentile)
Particulate Matter (PM 2.5)
Ozone
NATA Diesel PM
NATA Air Toxics Cancer Risk
NATA Respiratory Hazard Index (HI)
Traffic Proximity
Lead Paint Indicator
National Priority List (NPL) Site Proximity
Risk Management Plan (RMP) Site Proximity
Hazardous Waste Proximity
Wastewater Discharge Proximity
92
93.6
81
92.4
91.7
80.3
82.4
75.2
94.1
65.9
94.8
Demographic Profile of Surrounding Area (1 mile)
Number of EJ Indexes Above 80th Percentile
9
View EJSCREEN Report
This section provides demographic information regarding the community surrounding the facility. ECHO compliance data alone are not sufficient to determine whether violations at a particular facility had negative impacts on public
health or the environment. Statistics are based upon the 2010 U.S. Census and 2014 - 2018 American Community Survey (ACS) 5-year Summary and are accurate to the extent that the facility latitude and longitude listed below are
correct. EPA's spatial processing methodology considers the overlap between the selected radii and the census blocks (for U.S. Census demographics) and census block groups (for ACS demographics) in determining the demographics
surrounding the facility. For more detail about this methodology, see the DFR Data Dictionary.
General Statistics (U.S. Census)
Elsa
Total Persons
Population Density
Housing Units in Area
425
141/sq.mi.
174
General Statistics (ACS..(Americap_Commugity_Survey))
Total Persons
Percent People of Color
Households in Area
Households on Public Assistance
Persons With Low Income
Percent With Low Income
1,258
77%
417
0
598
48%
Radius of Selected Area
Center Latitude
Center Longitude
Land Area
Water Area
1 mi.
35.760856
-79.462201
98%
2%
Income Breakdown (ACS..(Americap_CommuoitySuwey)) - Households CM
Less
Less than $15,000 70 (16.83%)
Age Breakdown (U.S. Census) - Persons (%)
Children 5 years and younger
Minors 17 years and younger
Adults 18 years and older
Seniors 65 years and older
37 (9%)
126 (30%)
299 (70%)
41 (10%)
Race Breakdown (U.S. Census) - Persons (%)
White
African -American
Hispanic -Origin
Asian/Pacific Islander
American Indian
Other/Multiracial
253 (60%)
97 (23%)
114 (27%)
2 (0%)
2 (0%)
72 (17%)
Education Level (Persons 25 & older) (AC5„(Amet7e8n, Community,.. prygy)) - Persons
Less than 9th Grade
9th through 12th Grade
High School Diploma
Some College/2-year
B,S./B.A. (Bachelor of Science/Bachelor of Arts.) or More
_............................................................................................
167 (23.89%)
71 (10.16%)
173 (24.75%)
202 (28.9%)
85 (12.16%)
https://echo.epa.gov/detailed-facility-report?fid=110040028332 6/7

3/22/22, 1:31 PM Detailed Facility Report I ECHO I US EPA
Income Breakdown(ACS..(American_CommunitySurvey)) - Households (%)
$15,000 - $25,000
$25,000 - $50,000
$50,000 - $75,000
Greater than $75,000
72 (17.31%)
107 (25.72%)
80 (19.23%)
87 (20.91 %)
LAST UPDATED ON MARCH 18, 2022
DATA REFRESH INFORMATION
https://echo.epa.gov/detailed-facility-report?fid=110040028332 7/7

DocuSign Envelope ID: 89DD9E16-4D1 C-431 D-B97B-602931 B3912E
ROY COOPER
Governor
ELIZABETH S. BISER
Secretary
S. DANIEL SMITH
Director
David Honeycutt, P.E.
McGill Associates, PA
5 Regional Circle, Suite A
Pinehurst, North Carolina 28734
Dear Mr. Honeycutt:
NORTH CAROLINA
Environmental Quality
December 10, 2021
Subject: Speculative Effluent Limits
Siler City WWTP NC0026441
Chatham County
Cape Fear River Basin
This letter provides speculative effluent limits for expanding the WWTP serving Siler City located
on Loves Creek with a proposed flow of 6.0 MGD. These speculative limits replace the September
17, 2021 speculative limits to incorporate changes made at the request of the City to increase the
weekly average limit for organic nitrogen and corrects an error in seasonal loading. Please
recognize that any future speculative limits requests may change based on future water quality
initiatives.
Receiving Streams. Loves Creek is located within the Cape Fear River Basin. Loves Creek has a
stream classification of C, and waters with this classification have a best usage for aquatic life
propagation and maintenance of biological integrity, wildlife, secondary recreation, and
agriculture. Loves Creek has a summer 7Q10 flow of 0.0 cfs, a winter 7Q10 flow of 0.23 cfs, a
30Q2 flow of 0.32 cfs, and an annual average flow of 7.4 cfs.
Loves Creek is currently listed as an impaired waterbody on the 2020 North Carolina 303(d)
Impaired Waters List for exceeding benthic criteria. There are no specific permitting strategies or
TMDL for this stream. Loves Creek is also part of the Middle Cape Fear River Basin, many
segments of which suffer from Chlorophyll -a impairment due to excess nutrients. Nutrient criteria
development and modeling are currently underway to address these impairments and may affect
future permit limits.
Based upon a review of information available from the North Carolina Natural Heritage Program
Online Map Viewer, there are Federally Listed threatened or endangered aquatic species identified
within a 5-mile radius of the proposed discharge location. If there are any identified
threatened/endangered species, it is recommended that the applicant discuss the proposed project
with the US Fish and Wildlife Service to determine whether the proposed discharge location might
impact such species.
NOCTH CAROLINA
1 E
Department of EnvInnmenpl Duel`
North Carolina Department of Environmental Quality Division of Water Resources
512 North Salisbury Street 11617 Mail Service Center I Raleigh, North Carolina 27699-1617
919.707.9000

DocuSign Envelope ID: 89DD9E16-4D1 C-431 D-B97B-60293183912E
Speculative Effluent Limits. Based on Division review of receiving stream conditions and prior
water quality modeling results, speculative limits for an expansion to 6.0 MGD are presented in
Table 1. A complete evaluation of these limits and monitoring requirements for metals and other
toxicants, as well as potential instream monitoring requirements, will be addressed upon review of
the formal NPDES permit application which is under review. Some features of the speculative
limit development include the following:
• BOD/NH3/TSS Limits. Assimilative capacity to protect the instream dissolved oxygen
standard of 5.0 mg/L is based on prior stream modeling which showed that the
receiving stream's dissolved oxygen is sensitive to organic nitrogen. Seasonal BOD
limits from the prior speculative limits were dropped to comply with 15A NCAC
2B .0404. The resultant limits are considered technologically feasible.
• Total Nitrogen Load Limits. The annual load is based on the June 2020 Settlement
Agreement between Siler City, the Division, and the Rocky River Watch based on a
treatment level of 3.0 mg/L of Total Nitrogen to protect the Rocky River watershed and
Middle Cape Fear River Basin from Chlorophyll -a impacts. Please note that there is
nutrient criteria development and modeling of the basin which may result in stricter
limits than those found in Table 1 (at some time in the future).
TABLE 1. Speculative Limits for Siler City WWTP proposed expansion.
Effluent Characteristic
Effluent Limitations
Monthly
Average
Weekly
Average
Daily
Maximum
Flow
6.0 MGD
BOD5
5.0 mg/L
7.5 mg/L
NH3 as N (Apr. -Oct.)
1.0 mg/L
3.0 mg/L
NH3 as N (Nov. -Mar.)
1.8 mg/L
5.4 mg/L
Dissolved Oxygen
(minimum daily average)
7.0 mg/L
Organic Nitrogen (Apr. -Oct.)
3.0 mg/L
4.5 mg/L
Total Phosphorus (Apr -Sept.)
0.5 mg/L
(quarterly average)
Total Phosphorus (Oct -Mar.)
2.0 mg/L
(quarterly average)
Total Nitrogen Load
54,800 lbs/year 1
TSS
20 mg/L
30 mg/L
TRC
17 µg/L
Fecal coliform
(geometric mean)
200/100 mL
400/100 mL
Chronic Toxicity
Pass/Fail (Quarterly test)
90%
1. Equivalent to a 3.0 mg/L concentration (on an Annual basis). Monitor and report
pounds per month.
2. The total phosphorus requirements will be consistent with the existing permit.
NORTH
Department of Emim.mmrt.i au.nq
North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street 11617 Mail Service Center I Raleigh, North Carolina 27699-1617
919.707.9000

DocuSign Envelope ID: 89DD9E16-4D1C-431D-B97B-602931B3912E
Engineering Alternatives Analysis (EAA). Please note that the Division cannot guarantee that
an NPDES permit for a new or expanding discharge will be issued with these speculative limits.
Final decisions can only be made after the Division evaluates the formal permit application for
the expanded discharge. In accordance with North Carolina Administrative Code 15A NCAC
2H.0105(c), the most environmentally sound alternative should be selected from all reasonably
cost-effective options. Therefore, as a component of all NPDES permit applications for new
or expanding flow, a detailed engineering alternatives analysis (EAA) must be prepared (in
this case we have this information which is under review). The EAA must justify requested
flows and provide an analysis of potential wastewater treatment alternatives.
State Environmental Policy Act (SEPA) EA/EIS Requirements. A SEPA EA/EIS document
may be required for projects that: 1) involve $10 Million or more of state funds; or 2) will
significantly and permanently impact 10 or more acres of public lands. Please check with the
DWR SEPA coordinator (David Wainwright, 919-707-9045) as to whether your project
requires SEPA review. For projects that are subject to SEPA, the EAA requirements discussed
above will need to be folded into the SEPA document. Additionally, if subject to SEPA, the
NPDES Unit will not accept an NPDES permit application for a new/expanding discharge until
the Division has approved the SEPA document and sent a Finding of No Significant Impact
(FONSI) to the State Clearinghouse for review and comment.
Should you have any questions about these speculative limits or NPDES permitting
requirements, please feel free to contact David Hill at [e-mail] or (919) 707-
3612.
Respectfully,
r6DocuSigned
AAo������by:
o1. �'e.'' `
C464531431644FE...
Michael Montebello
Supervisor, NPDES Municipal Permitting Unit
Electronic Copy:
NC WRC, Eastern Piedmont Coordinator, [e-mail]
US Fish and Wildlife Service, [e-mail]
DWR/Water Quality Regional Office/Raleigh/Scott Vinson
DWR/Basinwide Planning/Nora Deamer
DWR/Modeling and Assessment Branch/Pam Behm
Siler City: Roy Lynch ([e-mail]), Chris McCorquodale
([e-mail])
SELC: Blakely Hildebrand ([e-mail]) , Jean Zhuang ([e-mail])
NORTH
Department of Emimemmrt.i au.nq
North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street 11617 Mail Service Center I Raleigh, North Carolina 27699-1617
919.707.9000

DocuSign Envelope ID: A3DD6EC1-8A1 F-4231-A273-E5DFD8FBD986
ROY COOPER
Governor
ELIZABETH S. BISER
Secretary
S. DANIEL SMITH
Director
David Honeycutt, P.E.
McGill Associates, PA
5 Regional Circle, Suite A
Pinehurst, North Carolina 28734
Dear Mr. Honeycutt:
NORTH CAROLINA
Environmental Quality
March 15, 2022
Subject: Revised Expansion Schedule Review
Permit NC0026441
Siler City WWTP
Chatham County
The Divisions of Water Resources (DWR) has reviewed the revised schedule for the expansion
of Siler City WWTP to 6.0 MGD, submitted on February 16, 2022 (attached). After consulting
with the Division of Water Infrastructure and Rocky River Watch, DWR hereby approves the
schedule revision pursuant to Paragraph 3.b. of the Settlement Agreement between DWR, the
Town of Siler City and Rocky River Watch dated June 5, 2020, the Divisions and Rocky River
Watch find the proposed expansion schedule revision acceptable.
Thank you for your continued cooperation with the NPDES program. If you have any questions
or comments, please contact, Gary Perlmutter, Environmental Specialist II, DWR at
[e-mail] or 919-306-1017 (cell).
Sincerely,
LDocuSigned b/y�:, L
tt 14-4014d
C464531431644FE...
Michael Montebello
Supervisor, NPDES Municipal Permitting Unit
eCopy: NCDEQ / DWI / Jonathan Risgaard and Ken Pohlig
Siler City: Roy Lynch ([e-mail]) and Chris McCorquodale
(cmmc orquodale(a, silercity. org)
SELC: Blakely Hildebrand ([e-mail]) and Jean Zhuang
(j zhuang@ selc. org)
=D.E
NORTH CAROLINA
Department of Environmental Duality
North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street 11617 Mail Service Center I Raleigh, North Carolina 27699-1617
919.707.9000

DocuSign Envelope ID: A3DD6EC1-8A1 F-4231-A273-E5DFD8FBD986
From:
To:
Subject:
Date:
Dunn, Glenn
Blakely Hildebrand; Jean Zhuanq; Perlmutter, Gary; mike.montebelloPncdenr.gov
[External] FW: Slier City WWTP Schedule Request
Wednesday, February 16, 2022 10:11:22 AM
CAUTION: External email. Do not click links or open attachments unless you verify. Send all suspicious email as an
attachment to Report Spam.
I am forwarding to you the proposed revised upgrade schedule that David Honeycutt and the Town
propose . As you suggested at our meeting week before last , some margin has been built in . After
you review it , please let me know whether you find it acceptable .Regarding the proposed plan for
managing BOD and ammonia , unfortunately it is more complex than originally thought and David is
working with Chris and Brittany on additional measures and we hope to let you know more soon .
we're sorry about the delay .
NPDES Permit Modification Public Notice
NPDES Permit Modification Issuance
Complete Design and submit Authorization to Construct Permit to NCDEQ
Authorization to Construct Permit Approval
2022
Award Construction Contract for 6 MGD Expansion
Complete Construction of 3rd Treatment Train with a capacity of 2 MGD
Complete Construction of 6 MGD Expansion
2024
Total Nitrogen limit of 54,800 Ibs/year effective
mcgill
Shaping
Communities
Together ®
David Honeycutt, P.E.
Principal/Pinehurst Office Manager
McGill Associates, PA
5 Regional Circle, Suite A, Pinehurst, NC 28374
T 910.295.3159
C 910.690.2583
[e-mail]
mcgillassociates.com
*********
March 2022
April 30, 2022
August 1, 2022
December 31,
April 30, 2023
April 30, 2024
December 31,
January 1, 2025
This message constitutes a confidential attorney -client communication. If you have received this
communication in error, do not read it. It is not intended for transmission to, or receipt by, any unauthorized
persons. Please delete it from your system without copying it, and notify the sender by reply email or by

February 28, 2022
Mr. Gary Perlmutter, Environmental Specialist
NCDEQ/Division of Water Resources
NPDES Municipal Permitting Unit
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
RE: Town of Siler City
Siler City WWTP
NPDES Permit Renewal — Chemical Addendum
Permit No. NC0026441
Dear Mr. Perlmutter:
As a supplement to the Siler City Wastewater Treatment Plant NPDES Application package that
is currently under review the Town of Siler City is submitting additional information per Session
Law 2018-5, Senate Bill 99, Section 13.1 (r). At the request of the Division of Water Quality (DEQ),
the Town conducted WWTP effluent sampling during the months of July, August, and September
of 2019 for 1,4 Dioxane and PFAS. The analysis for 1,4 Dioxane was done in accordance with
EPA Method 624.1 which is a certified method in 40 CFR Part 136. The Analysis for PFAS was
done in accordance with EPA Draft Method 1633. This PFAS Sampling method is not certified.
The following three attachments are being provide as a supplement to the Siler City WWTP
NPDES Permit:
• Attachment 1: Chemical Addendum to NPDES Application
• Attachment 2: Lab Report Summary Data from PFAS Sampling Results
• Attachment 3: Lab Report Summary Data from 1,4 Dioxane Sampling Results
If you have any questions or require further information regarding this project please let us know.
Sincerely,
TOWN OF SILER CITY
ROY LYNCH
Town Manager
Enclosures

EPA Identification Number
NPDES Number
Facility Name
Outfall Number
Estimated Concentration (If
Known)
FRS ID: 110022547243
Pollutant (Required)
NC 0026441
CAS number
Method Number
(if Applicable)
Town of Siler City WWTP
Reason Pollutant Believed
001
Present in Discharge
PFBA
375-22-4
1633
(Not Detected)
PFPeA
2706-90-3
1633
Effluent Sampling Results (July, August, September 2019)
Median of three influent sampling
events (July, August, and September
2019) was 13.75 ng/L
PFHxA
307-24-4
1633
Effluent Sampling Results (July, August, September 2019)
Median of three influent sampling
events (July, August, and September
2019) was 6.15 ng/L
PFHpA
375-85-9
1633
Effluent Sampling Results (July, August, September 2019)
Median of three influent sampling
events (July, August, and September
2019) was 2.05 ng/L
PFOA
335-67-1
1633
Effluent Sampling Results (July, August, September 2019)
Median of three influent sampling
events (July, August, and September
2019) was 4.02 ng/L
PFNA
375-95-1
1633
(Not Detected)
PFDA
335-76-2
1633
(Not Detected)
PFUnA
2058-94-8
1633
(Not Detected)
PFDoDA
307-55-1
1633
(Not Detected)
PFTrDA
72629-94-8
1633
(Not Detected)
PFTeDA
376-06-7
1633
(Not Detected)
L-PFBS
375-73-5
1633
(Not Detected)
PFPeS
2706-91-4
1633
(Not Detected)
PFHxS
355-46-4
1633
Effluent Sampling Results (July, August, September 2019)
Median of three influent sampling
events (July, August, and September
2019) was 1.73 ng/L
PFHpS
375-92-8
1633
(Not Detected)
PF05
1763-23-1
1633
Effluent Sampling Results (July, August, September 2019)
Median of three influent sampling
events (July, August, and September
2019) was 3.89 ng/L
PFNS
68259-12-1
1633
(Not Detected)
PFDS
335-77-3
1633
(Not Detected)
PFOSA
754-91-6
1633
(Not Detected)
N-MeFOSAA
2355-31-9
1633
(Not Detected)
N-EtF05AA
2991-50-6
1633
(Not Detected)
1,4 Dioxane
123-91-1
EPA 624.1
Effluent Sampling Results (July, August, September 2019)
Median of three influent sampling
events (July, August, and September
2019) was 1.3 Ug/L

I certify that to the best of my knowledge all analytical data presented in this report:
• Have been checked for completeness
• Are accurate, error -free, and legible
• Have been conducted in accordance with approved protocol, and that all deviations and
analytical problems are summarized in the appropriate narrative(s)
This analytical report was prepared in Portable Document Format (.PDF) and contains 26
pages.
QA ' iew Performed by: Juanica L. Thomas
r.
lira "4-
ENTHALPY
Report Issued Date:
08/09/19
EU # 0719-708R 2 of 26

�� ENTHALPY
Summary of Results: PFAS
Enthalpy Ultratrace Batch #
10383
PFAS
Analyte
Method Blank
Effluent
ng/L
ng/L
Acids
PFBA
NDU
ND U
PFPeA
2.21 J
14.5 B
PFHpA
3.39
9.94 B
PFHpA
NDU
2.101
PFOA
ND U
5.49
PFNA
NDU
ND U
PFDA
NDU
ND U
PFUnA
NDU
ND U
PFDoA
NDU
ND U
PFTrA
NDU
ND U
PFTA
NDU
ND U
Sulfonates
L-PFBS
NDU
ND U
PFPeS
NDU
ND U
PFHxS
NDU
2.001.
PFHpS
NDU
ND U
PFOS
ND U
5.66
PFNS
NDU
ND U
PFDS
NDU
ND U
Other
PFOSA
NDU
ND U
N-MeFOSAA
NDU
ND U
N-EtFOSAA
ND U
ND U
Lab Sample ID
LMB_10383
0719-708_10383_001R
EU # 0719-708R 4 of 26

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I certify that to the best of my knowledge all analytical data presented in this report:
• Have been checked for completeness
• Are accurate, error -free, and legible
• Have been conducted in accordance with approved protocol, and that all deviations and
analytical problems are summarized in the appropriate narrative(s)
This analytical report was prepared in Portable Document Format (.PDF) and contains 25
pages.
Associate II
iew Performed by: Juanica L. Thomas
,,,,„,10.
ba 40_
ENTHALPY
Report Issued Date:
09-10-19
EU # 0819-709 2 of 25

101;1 ENTHALPY
___. ANALYTICAL
Summary of Results: PFAS
Enthalpy Ultratrace Batch #
10443
PFAS
Analyte
Method Blank
ng/L
Effluent
ng/L
Acids
PFBA
NDU
ND U
PFPeA
ND U
13.0
PFHxA
NDU
5.89 J
PFHpA
NDU
0.717 J
PFOA
ND U
4.02 J
PFNA
NDU
ND U
PFDA
NDU
ND U
PFUnA
NDU
ND U
PFDoA
NDU
ND U
PFTrA
NDU
ND U
PFTA
NDU
ND U
Sulfonates
L-PFBS
NDU
ND U
PFPeS
NDU
ND U
PFHpS
NDU
ND U
PFHpS
NDU
ND U
PFOS
NDU
3.841
PFNS
NDU
ND U
PFDS
NDU
ND U
Other
PFOSA
NDU
ND U
N-MeFOSAA
NDU
ND U
N-EtFOSAA
ND U
ND U
Lab Sample ID
MB_10443
0819-709_10443_001
EU # 0819-709 4 of 25

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Special Handling:
,0'Sitandard Turn Around Time
❑ Rush Turn Around Time — Date Needed
• All Fast TATs Subject to Approval by Enthalpy Analytical, Inc.
• All Samples Disposed of After 6 months Unless Otherwise Instructed.
Enthalpy Analytical -Wilmington, NC has added enhancements to standard methods to improve accuracy,
precision and permit an assessment of laboratory performance in the Context of your specific data needs. For
more information email [e-mail].
This Chain of Custody is applicable to
Non -Air samples. Standard TAT differ
per analysis and are provided by request.
Notes:
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Sample Temperature Upon Receipt
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I certify that to the best of my knowledge all analytical data presented in this report:
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• Are accurate, error -free, and legible
• Have been conducted in accordance with approved protocol, and that all deviations and
analytical problems are summarized in the appropriate narrative(s)
This analytical report was prepared in Portable Document Format (.PDF) and contains 33
pages.
ENTHALPY
QA Revie Performed by: Bryan A. Vi
Report Issued Date:
01 OCT 19
EU#0919-711 Page 2 of 33

'� ENTHALPY
Summary of Results: PFAS
Enthalpy Ultratrace Batch #
10463
PFAS
Analyte
Method Blank
ng/L
Effluent
ng/L
Acids
PFBA
NDU
ND U
PFPeA
NDU
ND U
PFHxA
NDU
6.15
PFHpA
NDU
2.05
PFOA
ND U
3.71
PFNA
NDU
ND U
PFDA
NDU
ND U
PFUnA
NDU
ND U
PFDoA
NDU
ND U
PFTrA
NDU
ND U
PFTA
0.594J
ND U
Sulfonates
L-PFBS
NDU
ND U
PFPeS
PFHxS
NDU
NDU
ND U
1.46J
PFHpS
NDU
ND U
PFOS
ND U
3.89
PFNS
NDU
ND U
PFDS
NDU
ND U
Other
PFOSA
NDU
ND U
N-MeFOSAA
NDU
ND U
N-EtFOSAA
ND U
ND U
Lab Sample ID
MB_10463
0919 711_10463_001R
EU#0919-711 Page 4 of 33

pecial Handling:
Standard Turn Around Time
❑ Rush Turn Around Time — Date Needed
• All Fast TATs Subject to Approval by Enthalpy Analytical, Inc.
• All Sam les Disposed of After 6 months Unless Otherwise Instructed.
Enthalpy Analytical.Wllmington,NC has added enhancements to standard methods to improve accuracy,
I precision and permit an assessment of laboratory performance in the context of your specific data needs. For
more information email [e-mail].
This Chain of Custody is applicable to
Non -Air samples. Standard TAT differ
per analysis and are provided by request.
Notes:
Sample Temperature Upon Receipt
❑ Iced ❑ Ambient °C 2G.*
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Chain of Custody Record
ENTHALPY Enthalpy Ultratrace Job#: _ COC Page of
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Matrix: GW-Groundwater, WW-Wastewater, NW -Non -Potable Water, DW-Drinking Water, S-Soil, SL-Sludge, eT-
Biological Tissue, O-Other
Type: G=Grab C=Composite Q=Quality Control
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Client Name: 5: i t% !'t LA.;
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Meritech, Inc.
Environmental Laboratory
Laboratory Certification No. 165
Contact: Bobbie Hill
Client: Town of Siler City
198 Utility Dr
Siler City, NC 27344
Report Date:
NPDES#:
Date Sample Rcvd:
7/18/2019
NC0026441
7/9/2019
Meritech Work Order # 07091982
Parameters
Cadmium, total
Results
<0.002 mg/L
Sample: Effluent Composite
Analysis Date
7/11/19
Reporting Limit
0.002 mg/L
7/8-9/19
Method
EPA 200.7
Meritech Work Order # 07091983
Parameters
1,4 Dioxane + Trip Blank
Results
Attached
Sample: Effluent Grab
Analysis Date
7/11/19
Reporting Limit
7/9/19
Method
EPA 624.1
I hereby certify that 1 have reviewed and approve these data.
Laboratory Representative
642 Tamco Road, Reidsville, North Carolina 27320
tel.[phone] fax.[phone]

Client:
Project:
Client Sample ID:
Sample Collection:
MERITECH, INC.
Town of Suter City
1,4 Dioxane
Effluent
07/09/19
Environmental Laboratories
Laboratory Certification #165
Meritech ID#:
Analysis:
Analyst:
Dilution Factor:
Report Date:
EPA 624.1 VOLATILE ORGANICS
Parameter
1,4-Dioxane (p-Dioxane)
Trip Blank
Batch Blank = Below Reporting Limit
Internal Standards method criteria acceptable
Surrogate Recoveries
Toluene-d8
Bromofluorobenzene
Spike Conc
30 ug/L
30 ug/L
* - If "no" is selected, see second page for details.
I hereby certify that I have reviewed and approve these data.
Result
1.30 ug/L
< 1,00 ug/L
(Yes ) / No
(Yes) / No
07091983
07/11/19
VWV
1
07/15/19
Spike Recovery Limits
94%
99%
67-151%
45-161%
Laboratory Rep
ve
642 Tamco Road * Reidsville, NC 27320
[phone] * [e-mail]

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8/9/18 Chain of Custody Record (COC)
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Relinquished by: `,`/�_` Date:7 c!—f<i Time: JJ_Ujctp,.„
Are these results for regulatory purposes? Yes
Comments:
*** Dechlorination (<0.5 ppm)_of Ammonia, Cyanide, Phenol and TKN samples must be done in the field prior to preservation. ***
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Meritech, Inc.
Environmental Laboratory
Laboratory Certification No.165
Contact: Bobbie Hill
Client: Town of Siler City
198 Utility Dr
Siler City, NC 27344
Report Date:
NPDES#:
Date Sample Rcvd:
8/20/2019
NC0026441
8/8/2019
Meritech Work Order # 08081980
Parameters
Cadmium, total
Results
<0.002 mg/L
Sample: Effluent Composite
Analysis Date
8/14/19
Reporting Limit
0.002 mg/L
8/5-6/19
Method
EPA 200.7
Meritech Work Order # 08081981
Parameters
1,4 Dioxane + Trip Blank
Results
Attached
Sample: Effluent Grab
Analysis Date
8/12/19
Reporting Limit
8/8/19
Method
EPA 624.1
I hereby certify that I have reviewed and approve these data.
72abO tar ory
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!presentative
642 Tamco Road, Reidsville, North Carolina 27320
tel.[phone] fax.[phone]

Client:
Project:
Client Sample ID:
Sample Collection:
MERITECH, INC.
Environmental Laboratories
Laboratory Certification #165
Town of Slier City WWTP
1,4-Dioxane
Effluent
08/08/19
Meritech ID#:
Analysis:
Analyst:
Dilution Factor:
Report Date:
EPA 624.1 VOLATILE ORGANICS
Parameter
1,4-Dioxane (p-Dioxane)
Trip Blank
Batch Blank = Below Reporting Limit
Internal Standards method criteria acceptable
Surrogate Recoveries
Toluene-d8
Bromofluorobenzene
Spike Cone
30 ug/L
30 ug/L
* - If "no" is selected, see second page for details.
1 hereby certify that I have reviewed and approve these data.
Result
1.58 ug/L
< 1.00 ug/L
(Yes) / No
(Yes) / No
08081981
08/12/19
VWV
1
08/16/19
Spike Recovery Limits
101%
98%
67-151%
45-161%
642 Tamco Road * Reidsville, NC 27320
[phone] * [e-mail]

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Client:
Project:
Client Sample ID:
Sample Collection:
MERITECH, INC.
Sher City WWTP
1,4 Dioxane
Plant Effluent
09/10/19
Environmental Laboratories
Laboratory Certification #165
Merited" ID#:
Analysis:
Analyst:
Dilution Factor:
Report Date:
EPA 624.1 VOLATILE ORGANICS
Parameter
1,4-Dioxane (p-Dioxane)
Trip Blank
Batch Blank = Below Reporting Limit
Internal Standards method criteria acceptable
Surrogate Recoveries
Toluene-d8
Bromofluorobenzene
Result
<1.00ug/L
<1.00 ug/L
(Yes ) I No
(Yes) / No
091019157
09/12/19
VWV
1
09/17/19
Spike Cone Spike Recovery Limits
30 ug/L
30 ug/L
* - If "no" is selected, see second page for details.
I hereby certify that I have reviewed and approve these data.
108% 67-151%
99% 45-161%
Lab atory Rtative
642 Talmo Road * Reidsville, NC 27320
[phone] * info@meritechlabs,com

POTW Name:
Town of Siler City
NPDES#:
NC0026441
Effluent Grab (ng/L)
CAS Number
Analyte Name
Acronym
8-Jul-19
6-Aug-19
14-Sep-19
375-22-4
Perfluorobutanoic Acid
PFBA
ND
ND
ND
2706-90-3
Perfluoropentanoic Acid
PFPeA
14.5
13
ND
307-24-4
Perfluorohexanoic Acid
PFHxA
9.94
5.89
6.15
375-85-9
Perfluoroheptanoic Acid
PFHpA
2.1
0.717
2.05
335-67-1
Perfluorooctanoic Acid
PFOA
5.49
4.02
3.71
375-95-1
Perfluorononanoic Acid
PFNA
ND
ND
ND
335-76-2
Perfluorodecanoic Acid
PFDA
ND
ND
ND
2058-94-8
Perfluoroundecanoic Acid
PFUnA
ND
ND
ND
307-55-1
Perfluorododecanoic Acid
PFDoDA
ND
ND
ND
72629-94-8
Perfluorotridecanoic Acid
PFTrDA
ND
ND
ND
376-06-7
Perfluorotetradecanoic Acid
PFTeDA
ND
ND
ND
375-73-5
Perfluorobutanesulfonic Aid
L-PFBS
ND
ND
ND
2706-91-4
Perfluoropentane Sulfate
PFPeS
ND
ND
ND
355-46-4
Perfluorohexane Sulfate
PFHxS
2
ND
1.46
375-92-8
Perfluoroheptane Sulfate
PFHpS
ND
ND
ND
1763-23-1
Perfluorooctane Sulfate
PFOS
5.66
3.84
3.89
68259-12-1
Perfluorononane Sulfate
PFNS
ND
ND
ND
335-77-3
Perfluorodecane Sulfate
PFDS
ND
ND
ND
754-91-6
Perfluorooctane Sulfonamide
PFOSA
ND
ND
ND
2355-31-9
N-methyl Perfluorooctane Sulfonamido Acetic Acid
N-MeFOSAA
ND
ND
ND
2991-50-6
N-ethyl Perfluorooctane Sulfonamido Acetic Acid
N-EtFOSAA
ND
ND
ND
123-91-1
1,4 Dioxane
1.3 1.58 < 1