NC0020559_Fact Sheet_20231010

Fact Sheet
NPDES Permit No. NCO020559
Permit Writer/Email Contact: Gary Perlmutter, [e-mail]
Date: October 10, 2023
Division/Branch: NC Division of Water Resources/NPDES Municipal Permitting
Fact Sheet Template: Version 09Jan2017
Permitting Action:
❑x Renewal
❑ Renewal with Expansion
❑ New Discharge
❑ Modification (Fact Sheet should be tailored to mod request)
Note: A complete application should include the following:
• For New Dischargers, EPA Form 2A or 2D requirements, Engineering Alternatives Analysis, Fee
• For Existing Dischargers (POTW), EPA Form 2A, 3 effluent pollutant scans, 4 2nd species WET
tests.
• For Existing Dischargers (Non-POTW), EPA Form 2C with correct analytical requirements based
on industry category.
Complete applicable sections below. If not applicable, enter NA.
1. Basic Facility Information
Facility Information
Applicant/Facility Name:
City of Henderson/ Henderson Water Reclamation Facility (WRF)
Applicant Address:
PO Box 1434, Henderson, NC 27536
Facility Address:
1646 West Andrews Avenue, Henderson, NC 27536
Permitted Flow:
4.14 MGD / 6.0 MGD
Facility Type/Waste:
MAJOR Municipal: 98.2% domestic, 1.8% industrial'
Facility Class:
Grade IV
Treatment Units:
Bar screen, grit chamber, Parshall flume, biological nutrient removal system
(BNR: oxidation ditch with anaerobic and anoxic basins), clarifiers, tertiary
sand filters, post aeration, UV disinfection; sludge digestor, thickener
Pretreatment Program (Y/N)
Yes; active with LTMP
County:
Vance
Region
Raleigh
Footnote.
1. Based on total permitted industrial flow of 0.075 MGD.
Briefly describe the proposed permitting action and facility background: The City of Henderson has
applied for an NPDES permit renewal for its WRF in November 2022. Review of the application found it
incomplete with only the EPA Form 2A and a topographic map submitted; the following attachments were
found lacking:
• Three Effluent Pollutant Scans
Page 1 of 2

• Four 2nd species (Fathead Minnow) whole effluent toxicity reports
• Process narrative
• Facility diagram with water balances
• Sludge management plan
• Mercury Minimization Plan action summary
• Chemical Addendum
These elements were requested on 9/11/2023 and all but the Chemical Addendum and diagram were
received on 9/19/2023; the remaining were received on 9/25 and 9/26/2023.
This facility serves a population of — 16,400 residents in the City of Henderson (— 15,000) and parts of Vance
County (-1400). The facility has an active pretreatment program with one SIU, Mars Pet Care (pet food
manufacturer).
Inflow and Infiltration (I&I): The City reported an average daily flow of 0.195 MGD I&I. From the
application, the City states: "The City of Henderson has secured funding from state funding in order to
address I&I issues within the Sandy Creek Basin which contributes a major portion of I&I flow. "
Sludge Management: From the submitted Sludge Management Plan: "We have two aerobic digesters, a
drum thickener, we use polymer to dewater sludge. We also process 35-45 thousand gallons of mixed liquor
per day. Digested sludge is hauled from the facility by Granville Farms who holds a land application
permit. (Permit number WQ0000838) The onsite Lab forms testing to facilitate wasting rates. "
2. Receiving Waterbody Information
Receiving Waterbody Information
Outfalls/Receiving Stream(s):
Outfall 001 Nutbush Creek
Stream Segment:
23-8-(1)b
Stream Classification:
C
Drainage Area (mi2):
3.8
Summer 7Q10 (cfs)
0.2
Winter 7Q10 (cfs):
0.4
30Q2 (cfs):
0.5
Average Flow (cfs):
3.5
IWC (% effluent):
97% at 4.14 MGD / 98% at 6.0 MGD
2022 303(d) listed/parameter:
Fish Community (Nar, AL, FW)
Subject to TMDL/parameter:
Statewide Mercury TMDL
River Basin/HUC:
Roanoke / 03010102
USGS Topo Quad:
Henderson, NC
The 2022 Integrated Report cites the receiving stream segment as meeting criteria for all parameters
assessed except for Fish Community, which is impaired, and Fecal Coliform, for which data are
inconclusive. Nutbush Creek was assessed for Fish Community in 5/28/2019, resulting in a bioclassification
of Fair.
Page 2 of 3

3. Effluent Data Summary
Effluent data for Outfall 001 are summarized from February 2019 through August 2023 (Table 1).
Table 1. Effluent Data Summary Outfall 001.
Parameter
Units
Average
Max
Min
Permit Limit 1
Flow
MGD
2.23
11.50
0.70
MA = 4.14
BOD5 summer
mg/L
3.3
21.4
1.5
WA = 9.0
MA = 6.0
BOD5 winter
mg/L
3.8
89.8
< 2
WA = 18.0
MA = 12.0
BOD Removal
%
97.9
99.7
70.5
> 85
TSS
mg/L
3.7
309
< 2.5
WA = 45.0
MA = 30.0
TSS Removal
%
98.4
99.9
34.6
> 85
mg/L
WA = 9.0
NH3N summer
0.54
17.6
< 0.1
MA
NH3N winter
mg/L
0.57
14.9
< 0.1
MA = 6.0
Monitor &
TN
mg/L
12.7
u.a
Report
TP summer
mg/L
0.147
0.833
0.022
QA = 1.0
TP winter
mg/L
0.087
0.363
0.028
QA = 1.5
TRC
µg/L
17.0
19.8
< 16.0
DM = 17.0 2
Fecal coliform
#/100 mL
12.3
> 18,900
< 1
WA = 400
(geometric mean)
MA = 200
pH
SU
6.8
7.5
6.1
6.0 - 9.0
DO
mg/L
8.2
12.6
6.0
DA > 6.0
Monitor &
Temperature
° C
1 !.Z,
28.3
°
Report
Conductivity
µmhos/cm
405
1453
156
Monitor &
Report
Total Cadmium
µg/L
All non -detects at < 0.15
Monitor &
Report
Total Copper
µg/L
2.2
4
< 2
MA = 26.7
DM = 39.9
Total Selenium
µg/L
All non -detects at < 1
Monitor &
Report
Total Silver
µg/L
All non -detects at < 0.5 with one at < 5
Monitor &
Report
Total Hardness
mg/L
51
64
40
Monitor &
Report
Footnotes on the next page.
Page 3 of 4

Footnotes.
1. MA = Monthly Average; WA = Weekly Average, QA = Quarterly Average; DM = Daily Maximum; DA =
Daily Average.
2. Results < 50 µg/L considered compliant.
The highest annual average flow was 2.468 MGD, 59.6% of the permitted 4.14 MGD flow, in 2021.
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/1 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 proposedfor this permit
action: The current permit requires instream monitoring for a variety of parameters at various frequencies
at one upstream (U) and two downstream (131, 132) locations:
• DO, Temperature, Conductivity — weekly at all locations
DO, Temperature, Secchi Depth, NO2+NO3, Ammonia, TKN, TP, Chlorophyll -a — monthly in
summer at D 1 and D2
o DO, Temperature at depth profiles of 1 m intervals
o NO2+NO3, Ammonia, TKN, TP, Chl-a as spatial composites throughout the photic zone
Total Hardness — quarterly at U.
The locations are: U at NC Hwy 39, —0.27 miles from the outfall; D1 at powerline crossing, —0.43 miles
and D2 at immediately above the confluence of Indian Creek and Crooked Creek in Kerr Lake, —3.8 miles
from the outfall.
This extensive instream monitoring regime was first placed into the permit in 1990 following
recommendations of an instream assessment conducted in 1988, citing lake concerns of hyper- and
mesotrophic conditions and that the Nutbush Creek arm of the lake is dominated by WWTP effluent.
Instream data were acquired from submitted DMRs from August 2018 through February 2023 for review.
The data were checked against applicable stream standards as well as for effluent impacts, the latter via
statistical testing of downstream averages against the upstream average of each parameter using t-test with
the level of significance (p-value) set at 0.05. Hardness data are required for calculating total metals from
dissolved metals that are hardness -dependent and are discussed in Section 6.4 Reasonable Potential
Analysis below. The data are summarized in Tables 2 — 4 and discussed here.
Table 2. Instream Data Summary: averages of year-round data with ranges in parentheses.
*Statistically significantly different from Upstream.
Parameter, units
(Outfall 001)
(Out aH 001)
(Outf U 001A)
Standard
DO, mg/L
Avg = 10.6
Avg = 10.6
Avg = 10.7
5.0
(5.4-18.3)
(5.9-16.2)
(6.116.8)
Temperature, °C
Avg = 15.2
Avg = 18.9*
Avg = 19.4*
32.0
(3.1-27.7)
(4.6-33.4)
(4.3-32.9)
Conductivity, µmhos/cm
Avg = 215
Avg = 130*
Avg = 102*
NA
(7-587)
(70-238)
(71-148)
Page 4 of 5

Dissolved Oxygen (DO) — DO is in the permit as a parameter of concern for aquatic life. Summer minima
at all stations were all above the stream standard of 5.0 mg/L (15A NCAC 02B .0211). No statistically
significant differences were found between the upstream and downstream stations. Concurrent effluent
average DO is similar with similar summer minima.
Temperature — Temperature is in the permit as a parameter of concern for aquatic life. The summer
maximum at the upstream station was below the 32°C standard for lower piedmont and coastal plain waters
(15A NCAC 02B .0211), but the maxima downstream exceeded the standard with the maximum at D2
highest. Statistically significant differences were found between U and D 1 and between U and D2 with the
downstream temperatures at both stations higher. Average increase from up- to downstream temperature
increase at both stations was higher than the standard of 2.8°C (15A NCAC 02B .0211) with the average
increase to DI being 3.78 and the average increase to D2 being 3.71 °C. Temperature at D 1 increased >
2.8°C from upstream 143 times and at D2 it increased > 2.8°C from upstream 108 times. Concurrent effluent
temperatures are similar to those downstream, and on average higher than upstream. Statistical t-testing
found the effluent temperature to be significantly higher than that at U but not at than D 1.
Conductivity — Conductivity is in the permit as an indicator of industrial sources. The Town has an active
pretreatment program with one SIU, a pet food manufacturer. Downstream Conductivity at both stations
tested significantly lower than the upstream conductivity, suggesting no impact from the effluent. However,
concurrent effluent Conductivity is twice as high as that upstream, suggesting the potential to impact. It is
also possible that additional sources upstream are contributing to the conductivity of the stream.
Fecal Coliform — Instream monitoring for Fecal Coliform is not in the current permit; it was removed from
the permit in 1997. According to Division guidance, instream fecal coliform monitoring may be removed
from a permit unless the receiving stream is either Class B or impaired for the parameter. The receiving
stream Nutbush Creek currently meets the criteria as it is not impaired and is a Class C waterbody. Nutbush
Creek is also a headwater of Kerr Lake, which is Class B at —3.6 miles downstream of the outfall. Instream
fecal coliform data are available via the Division's Ambient Monitoring System at Station N5000000,
located at NCSR 1317 (Spring Valley Rd), —1.3 miles downstream of the outfall. Reviewed data from
January 2019 through December 2022 (n = 26 samples) ranged from 13 — 2500 cfu/ 100 mL with a geometric
mean of 225 cfu/100 mL. The Division's 2012 Roanoke Basin Plan reported that for the period of 2004 —
2008 the geomean was 116 cfu/100 mL, noting that when the geometric mean exceeds 200 cfu/100 mL,
there is a strong likelihood a 5-in-30 study would result in impairment. To address this concern, instream
monitoring for Fecal Coliform at all stations will be added to the permit at the same frequencies as for DO,
Temperature and Conductivity.
Depth profile data show that D 1 at the powerline is a shallower waterbody than D2, which is deeper into
Kerr Lake. DO decreased with depth at both stations, but temperatures show a consistent decrease only at
D2 (Table 3).
Page 5 of 6

Table 3. Instream Data Summary: averages of summer depth profile data with ranges in parentheses.
Parameter, units
Depth
(OutDI 001)
(OutfD OOlA)
Standard
Surface
Avg = 10.6
Avg = 9.3
5.0
(5.9 16.2)
(6.1 13.7)
1 m
Avg = 9.5
Avg = 9.4
NA
(4.8 - 17.0)
(5.8 - 14.0)
2 m
6.0
Avg = 9.0
NA
DO mg/L
g
(N = 1 sample)
(4.4 - 12.3)
3 m
NA
Avg = 7.8
NA
(4.1 - 11.0)
4 m
NA
Avg = 7.3
NA
(3.9 - 11.4)
Surface
Avg = 24.8
Avg = 25.0
32.0
(15.6 - 33.4)
(15.2 - 32.9)
1 m
Avg = 24.6
Avg = 24.4
NA
(16.7 - 30.8)
(15.1 - 30.7)
2 m
25.5
NA
Temperature, °C
(N = 1 sample)
(14.g 29.7)
3m
NA
Avg = 23.2
NA
(13.3-29.1)
4 m
NA
Avg = 22.9
NA
(14.3 - 28.9)
Summer monitoring for nutrient and related data were reviewed and compared between the two downstream
stations by statistical t-tests. All but Ammonia tested significantly lower at D2 than at D1; Ammonia tested
no difference (Table 4). Effluent nutrient parameters TN & TP plus Ammonia were all much higher than
instream concentrations on average, suggesting effluent impact. To better understand the potential instream
impact by the effluent, upstream monitoring for Ammonia, NO2+NO3, TKN, and TP will be added to the
permit.
Table 4. Instream Data Summary: summer downstream nutrient and related parameters
(averages with ranges in parentheses).
*Statistically significantly different from D1.
Parameter, units
D1
AMS Station
D2
Standard
(Outfall001)
N5000000
(Outfall001A)
Ammonia (NH3-N), mg/L
Avg = 0.100
Avg = 0.11
Avg = 0.097
NA
(0.061-0.200)
(0.02-1.70)
(0.071-0.100)
NOa+NO3, mg/L
Avg = 0.19
Avg = 2.93
Avg = 0.11
NA
(0.10-0.72)
(0.48-6.8)
(0.10-0.43)
TKN, mg/L
Avg = 0.98
Avg = 0.68
Avg = 0.63*
NA
(0.24-3.07)
(0.33-2.2)
(0.24-1.17)
Total Phosphorus (TP), mg/L
Avg = 0.090
Avg = 0.07
Avg = 0.049*
NA
(0.026-0.151)
(0.02-0.32)
(0.020-0.480)
Chlorophyll -a, mg/L
Avg = 39.6
NA
Avg = 28.4*
40
(17.3-125)
(11.9-54.3)
Page 6 of 7

Situated between D1 and D2 lies the station N500000, operated by the Division's Ambient Monitoring
System (AMS). Samples collected at this station were grabbed at the surface, no spatial composites
throughout the photic zone as are D 1 and D2, therefore comparisons could not be made.
However, AMS monitoring is year-round, not seasonal as at D 1 and D2. Review of the AMS data found no
discernable seasonal variation among nutrient parameters (Fig. 1). To better understand instream nutrient
concentrations and their impact on Chlorophyll -a concentrations both instream and in Kerr Lake, and in
consultation with the Division's River Basin Planning Branch, monitoring for these parameters will be
increased to year-round.
AMS Station 5000000
—
TP
NO2+NO3 TKN
8.0
0.35
7.0
0.30
J
6.0
■
0.25
50
J
0 4.0
%
0 20 E
z
0.15
N 3.0
r
z 2.0
A00666*0
%
_
0.10
1.0�
0.05
o.o
0.00
�y�
'y�,��•Lo
`L'�,~a•Ly
y
h
y
(S
,��,�O�y
1�
ti�$,�o�� ''11,�ay'Y
Figure 1. Nutrient concentrations in the Nutbush Creek arm of Kerr Lake, 2019-2022.
In August 2009, the benthic macroinvertebrate community in the receiving stream was evaluated at station
NB49 (approximately 1 mile downstream from WWTP). With respect to the benthic community, the stream
received a bioclassification of Fair, and a generally tolerant benthic community was found at this sampling
site. In June 2014, the fish community in the receiving stream was evaluated at station NF28 (1.3 miles
downstream from WWTP). The stream was rated Good -Fair, and the analysis noted that "there has been no
consistent long-term change in the water quality or fish community since 1994."
Is this facility a member of a Monitoring Coalition with waived instream monitoring (YIN): NO
Name of Monitoring Coalition: NA
5. Compliance Summary
Summarize the compliance record with permit effluent limits (past 5 years): From August 2018 through
July 2023 the facility had reported exceedences in BOD, Ammonia and TSS, resulting in various
enforcement actions (see Table 5). These violations are also listed in the EPA ECHO (Enforcement and
Compliance History Online) Detailed Facility Report.
Page 7 of 8

Table 5. Effluent monitoring violations summary, August 2018 — July 2023.
Weekly
Monthly
Daily
Notices of
Notices of
Enforcement
Parameter
Average
Average
Maximum
Deficiency
Violations
Cases
Exceedences
Exceedences
Exceedences
BOD
2
2
NA
1
0
3
Ammonia
I
NA
0
0
2
TSS
1
0
NA
0
0
1
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 with two test failures and passed the
post -fail subsequent tests. The four second species chronic toxicity tests, collected in October 2019, April
20020, July 2021, and January 2022, all passed.
Summarize the results from the most recent compliance inspection: The most recent facility inspection
conducted in June 2023 reported that the facility was largely well maintained and operated with the
following deficiencies: 1) flowmeters were not calibrated within the past year, and 2) ORC visits were not
documented. The most recent pretreatment inspection was conducted in August 2021 with no details of the
inspection results reported.
6. Water Quality -Based Effluent Limitations (WQBELs)
6.1 Dilution and Mixing Zones
In accordance with 15A NCAC 213.0206, the following streamflows are used for dilution considerations for
development of WQBELs: 1 Q 10 streamflow (acute Aquatic Life); 7Q 10 streamflow (chronic Aquatic Life;
non -carcinogen HH); 30Q2 streamflow (aesthetics); annual average flow (carcinogen, HH).
If applicable, describe any other dilution factors considered (e.g., based on CORMIX model results): NA
If applicable, describe any mixing zones established in accordance with 15A NCAC 2B.0204(b): NA
6.2 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.• Limits for
BOD5 at 4.14 MGD flow were determined in a 1988 waste load allocation on the basis of water quality
protection and the previous permit limits. Limits for BOD5 at 6.0 MGD flow are based on 1990 speculative
limits using previously permitted equivalent loading criteria and the previous QUAL2E model run in 1987
along with best professional judgment.
The following excerpt is from the July 31, 1990 Speculative Limits letter, modified for clarity:
Page 8 of 9

The following set of limits was derived for BOD5, Ammonia (NH3-N), and Dissolved Oxygen (DO):
Parameter
Summer
Winter
BOD5 (mg/L)
5.0
10.0
NH3-N (mg/L)
1.0
1.9
DO (mg/L)
7.0
7.0
These limits were derived based on a combination of water quality modeling and best professional
judgment. The previous model indicated that the minimum predicted DO occurred at the end of the
model at the stream -lake interface, with most of the oxygen demand remaining. Since the critical lake
portion cannot reliably be modeled with the available data, a water quality model was not run to
evaluate the 6.0 MGD waste flow. Instead, equivalent loading criteria were used to develop allocation
limits. At 6.0 MGD, the BOD5 limit would be 4.1 mg/L and the NH3-N limit would be 2.1 mg/L. Since
the Division (then known as Department of Environment, Health, and Natural Resources: Division of
Environmental Management) does not usually assign BOD5 limits below 5 mg/L, limits of 5 mg/L BOD5
and I mg/L NH3-N were assigned. These limits result in near identical ultimate BOD loading (1502
lb/d in previous allocation and 1476 lb/d for expansion).
While technology has advanced since 1990 and the Division has assigned BOD5 limits < 5 mg/L in
other permitting scenarios, it remains true that the BOD5 limit of 5.0 mg/L and ammonia limit of 1.0
mg/L at the 6.0 MGD flow tier result in a protective ultimate BOD5 loading. As such, no changes are
proposed for BOD5 limits. Please see Ammonia and Total Residual Chlorine Limitations below for
additional information regarding ammonia limits.
6.3 Ammonia and Total Residual Chlorine Limitations
Limitations for Ammonia are based on protection of aquatic life utilizing an ammonia chronic criterion of
1.0 mg/L (summer) and 1.8 mg/L (winter). Acute ammonia limits are derived from chronic criteria, utilizing
a multiplication factor of 3 for Municipals and a multiplication factor of 5 for Non -Municipals.
Limitations for Total Residual Chlorine (TRC) are based on the NC water quality standard for protection
of aquatic life (17 µg/L) and capped at 28 µg/L (acute impacts). Due to analytical issues, all TRC values
reported below 50 µg/L are considered compliant with their permit limit.
Describe any proposed changes to ammonia and/or TRC limits for this permit renewal: Current permit
Ammonia limits of 3.0/6.0 mg/L monthly/weekly average in summer and 6.0/18.0 mg/L monthly/weekly
average in winter at 4.14 MGD are based on a 1985 waste load allocation (WLA) using QUAL2 model
results for protection of the DO stream standard. Current Ammonia limits of 1.0/3.0 mg/L monthly/weekly
average and 2.0/6.0 mg/L monthly/weekly average at 6.0 MGD are based on a WLA calculation for
protection against ammonia toxicity. The WLA was used to evaluate ammonia limits using the permitted
flows, the low stream flows of 7Q 10 = 0.2 cfs (summer) and 0.4 cfs (winter), and the NC criteria of 1.0 and
1.8 mg/L, with resulting allowable concentrations of 1.0/3.0 mg/L monthly/weekly average in summer and
1.9/3.8 mg/L monthly/weekly average at both flow tiers. However, since there is no discernible differences
between up- and downstream DO and increased instream monitoring for ammonia is proposed, no changes
to effluent ammonia limits are proposed.
Current permit TRC limits of 17.0 µg/L daily maximum at both flow tiers were added in 1990 (July 31,
1990 letter) based on standard operating procedure/action level for TRC. The WLA form was also used to
calculate TRC allowable concentrations at both flow tiers, finding them to be as protective as the current
limits. No changes are proposed.
6.4 Reasonable Potential Analysis (RPA) for Toxicants
If applicable, conduct RPA analysis and complete information below.
Page 9 of 10

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 '/z 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.
Effluent and upstream hardness monitoring are required in the current permit for calculating total metals
for those dissolved metals that are hardness dependent. Permittee-submitted data averaged 51.0 mg/L
effluent and 67.2 mg/L upstream, both higher than the default value of 25 mg/L. These data were used in
the RPA.
A reasonable potential analysis was conducted on effluent toxicant data collected between August 2018
July 2023. 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:
o Total Zinc:
■ MA, DM = 238 µg/L at 4.14 MGD;
■ MA, DM = 235 µg/L at 6.0 MGD.
Monitoring Only. The following parameters will receive a monitor -only requirement since they
did not demonstrate reasonable potential to exceed applicable water quality standards/criteria, but
the maximum predicted concentration was >50% of the allowable concentration: None.
No Limit or Monitoring: The following parameters will not receive a limit or monitoring, since
they did not demonstrate reasonable potential to exceed applicable water quality standards/criteria
and the maximum predicted concentration was <50% of the allowable concentration: Arsenic,
Beryllium, Cadmium, Total Phenols, Total Chromium, Total Copper, Cyanide, Total Lead, Total
Molybdenum, Total Nickel, Total Selenium, Total Silver 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 at both flow tiers
o The following parameter(s) will receive a monitor -only requirement, since as part of a
limited data set, one sample exceeded the allowable discharge concentration: None at both
flow tiers.
Aside from the parameters above, no detections were reported in the Effluent Pollutant Scans.
If applicable, attach a spreadsheet of the RPA results as well as a copy of the Dissolved Metals
Implementation Fact Sheet for freshwater/saltwater to this Fact Sheet. Include a printout of the RPA
Dissolved to Total Metal Calculator sheet if this is a Municipality with a Pretreatment Program.
6.5 Toxicity Testing Limitations
Permit limits and monitoring requirements for Whole Effluent Toxicity (WET) have been established in
accordance with Division guidance (per WET Memo, 8/2/1999). Per WET guidance, all NPDES permits
issued to Major facilities or any facility discharging "complex" wastewater (contains anything other than
domestic waste) will contain appropriate WET limits and monitoring requirements, with several exceptions.
The State has received prior EPA approval to use an Alternative WET Test Procedure in NPDES permits,
using single concentration screening tests, with multiple dilution follow-up upon a test failure.
Page 10 of 11

Describe proposed toxicity test requirement: This is a Major POTW, and a chronic WET limit at 90% at
effluent at 4.14 and 6.0 MGD flow tiers will continue on a quarterly frequency.
6.6 Mercury Statewide TMDL Evaluation
There is a statewide TMDL for mercury approved by EPA in 2012. The TMDL target was to comply with
EPXs 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 has a MMP special condition, and an MMP summary was provided by the Permittee
upon request.
Describe proposed permit actions based on mercury evaluation: Since no annual average mercury
concentration exceeded the WQBEL, and no individual mercury sample exceeded the TBEL (Table 6), no
mercury limit is required. However, since the facility is > 2 MGD and has reported quantifiable levels of
mercury (> 1 ng/L), a mercury minimization plan (MMP) is required and the condition has been revised
toward maintaining the MMP.
Table 6. Mercury Effluent Data Summary.
2020
2021
2022
2023
# of Samples
1
12
3
1
Annual Average Conc. ng/L
1.1
1.8
0.5
0.5
Maximum Conc., ng/L
1.14
6.44
0.50
0.50
TBEL, ng/L
47
WQBEL, ng/L at 4.14 MGD
12.4
WQBEL, ng/L at 6.0 MGD
12.3
6.7 Other TMDL/Nutrient Management Strategy Considerations
If applicable, describe any other TMDLs/Nutrient Management Strategies and their implementation within
this permit: Currently the receiving stream has no TMDL or Nutrient Management Strategy. The current
permit has monthly monitoring for Total Nitrogen and weekly monitoring with seasonal limits for Total
Phosphorus. To better understand the effluent nitrogen, Nitrite+Nitrate (NO2+NO3) and Total Kjeldahl
Nitrogen (TKN) monitoring will be added to the permit at the same frequency as Total Nitrogen monitoring.
Seasonal TP limits for 4.14 MGD flow were originally based on a 1988 WLA (summer: 0.5 mg/L, winter:
2.0 mg/L) and modified in 1989 to current limits (summer: 1.0 mg/L, winter: 1.5 mg/L) based on a request
from the City of Henderson (see request letter April 12, 1989; approval letter May 8, 1989). For 6.0 MGD
flow, the TP limit of 0.5 mg/L was based on 1990 Speculative Limits for this flow. A mass balance showed
that an effluent TP concentration of 0.2 mg/L was needed to meet an instream target concentration of 150
µg/L during average stream flow; however, the limit of 0.5 mg/L was assigned during speculative limits
developed.
Instream water quality downstream of the outfall is concerning as Chlorophyll -a data collected by DWR
AMS average just below the stream standard of 40 µg/L. To address this concern, expanded instream
monitoring is proposed (see Section 4 above).
Page 11 of 12

6.8 Other WQBEL Considerations
If applicable, describe any other parameters of concern evaluated for WQBELs: Emerging contaminants
PFAS and 1,4-Dioxane were considered when the facility submitted its Chemical Addendum on 9/25/2023.
The City responded: "The City Of Henderson Water Reclamation doesn't anticipate any emerging
contaminants (L 4-D or PFAS) to be present in the wastewater. " The receiving water does not enter any
water supply waters before crossing the Virginia state line —14.3 miles downstream of the discharge. The
facility's permitted SIU is a pet food manufacturer that is not a potential 1,4-Dioxane source; no
requirements for 1,4-Dioxane were added to the permit. However, based on the pervasive nature of these
chemicals and following EPA guidance on PFAS monitoring (memo, 12/5/2022), quarterly monitoring for
PFAS will be added to the permit to generate data for future evaluation.
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 I5A
NCAC 2H.0107(c)(2)(B), 40CFR 122.47, and EPA May 2007 Memo: NA
If applicable, describe any water quality standards variances proposed in accordance with NCGS 143-
215.3(e) and I5A NCAC 2B.0226 for this permit renewal: NA
7. Technology -Based Effluent Limitations (TBELs)
Municipals.
Are concentration limits in the permit at least as stringent as secondary treatment requirements (30 mg1L
BODs/TSS for Monthly Average, and 45 mg/L for BODs/TSS for Weekly Average). YES
If NO, provide a justification for alternative limitations (e.g., waste stabilization pond). NA
Are 85% removal requirements for BODs/TSS included in the permit? YES. Review of the data for both
parameters found overall average of removal to be > 85%, but with 4 and 6 occurrences of BOD and TSS
removal < 85%, respectively.
If NO, provide a justification (e.g., waste stabilization pond). NA
Industrials. NA
8. Antidegradation Review (New/Expanding Discharge):
The objective of an antidegradation review is to ensure that a new or increased pollutant loading will not
degrade water quality. Permitting actions for new or expanding discharges require an antidegradation
review in accordance with 15A NCAC 2B.0201. Each applicant for a new/expanding NPDES permit must
document an effort to consider non -discharge alternatives per 15A NCAC 2H.0105(c)(2). In all cases,
existing instream water uses and the level of water quality necessary to protect the existing use is maintained
and protected.
If applicable, describe the results of the antidegradation review, including the Engineering Alternatives
Analysis (EAA) and any water quality modeling results: NA
9. Antibacksliding Review:
Page 12 of 13

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): Yes: Cadmium, Copper,
Selenium and Silver.
If YES, confirm that antibacksliding provisions are not violated: Based on RPA results of recent effluent
data with recent effluent and upstream hardness concentrations showing no reasonable potential to exceed
stream water quality standards (hereafter "RP"), limits and monitoring requirements for Total Copper have
been removed from the permit. Similarly, quarterly monitoring requirements for Total Cadmium, Total
Selenium and Total Silver have been removed from the permit.
10. Monitoring Requirements
Monitoring frequencies for NPDES permitting are established in accordance with the following regulations
and guidance: 1) State Regulation for Surface Water Monitoring, 15A NCAC 213.0500; 2) NPDES
Guidance, Monitoring Frequency for Toxic Substances (7/15/2010 Memo); 3) NPDES Guidance, Reduced
Monitoring Frequencies for Facilities with Superior Compliance (10/22/2012 Memo); 4) Best Professional
Judgement (BPJ). Per US EPA (Interim Guidance, 1996), monitoring requirements are not considered
effluent limitations under Section 402(o) of the Clean Water Act, and therefore anti -backsliding prohibitions
would not be triggered by reductions in monitoring frequencies.
All effluent parameters are monitored under 15A NCAC 02B .0500.
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. While NPDES regulated facilities would initially be required to submit additional NPDES
reports electronically effective December 21, 2020, EPA extended this deadline from December 21, 2020,
to December 21, 2025. The current compliance date, effective January 4, 2021, was extended as a final
regulation change published in the November 2, 2020 Federal Register. This permit contains the
requirements for electronic reporting, consistent with Federal requirements.
12. Summary of Proposed Permitting Actions:
Tables 7 and 8 summarize the permit conditions and proposed changes at the 4.14 and 6.0 MGD flow
tiers, respectively.
Table 7. Current Permit Conditions and Proposed Changes at 4.14 MGD.
Parameter
Current Permit 1
Proposed Change
Basis for Condition/Change
Flow
MA = 4.14 MGD
No change
15A NCAC 02B .0505
Monitor continuously
Page 13 of 14

Parameter
Current Permit 1
Proposed Change
Basis for Condition/Change
Summer:
MA = 6.0 mg/L
WA = 9.0 mg/L
WQBEL. Based on protection of
BOD5
Winter:
No change
DO standard. 15A NCAC 02B
MA = 12.0 mg/L
.0200, .0508.
WA = 18.0 mg/L
Monitor daily
MA = 30 mg/L
TBEL. Secondary treatment
TSS
WA = 45 mg/L
No change
standards, 40 CFR 133, 15A NCAC
Monitor daily
02B .0406, .0508.
Summer:
MA = 3.0 mg/L
WA = 9.0 mg/L
No change in effluent
WQBEL. Based on protection of
Winter:
limits or monitoring.
State DO WQ standard, 15A NCAC
MA = 6.0 mg/L
02B .0200.
NH3-N
WA = 18.0 mg/L
Increase instream
Monitor effluent daily
sampling to year-
Increased instream monitoring
Monitor instream
round; add monthly
added to better understand effluent
monthly at D1, D2 in
upstream monitoring.
impact.
summer
MA = 200 /100 mL
Add instream (U, D1,
WQBEL. State WQ standard, 15A
Fecal coliform
WA = 400 /100 mL
132) monthly
NCAC 02B .0200
Monitor daily
monitoring year-round
Downstream AMS data show
likelihood of impairment.
TRC
DM = 17 µg/L
No change
WQBEL. State WQ standard, 15A
Monitor daily
NCAC 02B .0200
pH
6 — 9 SU
No change
WQBEL. State WQ standard, 15A
Monitor daily
NCAC 02B .0200
DA > 6 mg/L
WQBEL. State WQ standard, 15A
Monitor effluent daily
NCAC 02B .0200, .0500. Instream
DO
Monitor instream
No change
monitoring based on 1990
monthly, including
recommendations from 1988
summer depth profiles at
Instream Assessment regarding Kerr
DI and D2
Lake trophic concerns.
Monitor effluent daily
State monitoring requirements, 15A
Monitor instream
NCAC 02B .0508. Instream
Temperature
monthly, including
No change
monitoring based on 1990
summer depth profiles at
recommendations from 1988
D1 and D2
Instream Assessment regarding Kerr
Lake trophic concerns.
Monitor effluent daily
State monitoring requirements, 15A
Conductivity
Monitor instream
No change
NCAC 02B
monthly
.0508.
Total Nitrogen
Monitor effluent
No change
State monitoring requirements, 15A
monthly
NCAC 213.0500.
Page 14 of 15

Parameter
Current Permit 1
Proposed Change
Basis for Condition/Change
Add monthly effluent
Monitor instream
monitoring.Increase instream
To better understand effluent TN
TKN
monthly at D1, D2 in
sampling year-
concentrations and effluent impact
summer
round; add monthly
on instream concentrations.
upstream monitoring.
Add monthly effluent
Monitor instream
monitoring.
Increase instream
To better understand effluent TN
NO2+NO3
monthly at D1, D2 in
sampling to year-
concentrations and effluent impact
summer
round; add monthly
on instream concentrations.
upstream monitoring.
Summer:
QA = 1.0 mg/L
WQBEL. Originally based on 1988
Winter:
Increase instream
WLA, modified per City request in
Total Phosphorus
QA = 1.5 mg/L
Monitor weekly
sampling to year-
round; add monthly
1989. Upstream monitoring to better
Monitor instream
upstream monitoring.
understand effluent impact on
monthly at D1, D2 in
instream concentrations.
summer
No reasonable potential (RP) to
Total Cadmium
Monitor quarterly
Remove from permit
exceed stream WQ standard found
in RPA.
MA = 26.7 µg/L
No reasonable potential (RP) to
Total Copper
DM = 39.9 µg/L
Remove from permit
exceed stream WQ standard found
Monitor monthly
in RPA.
Total Silver
Monitor quarterly
Remove from permit
No RP found; all data were
nondetects.
No RP found; maximum predicted
value > 50% allowable
Total Selenium
Monitor quarterly
Remove from permit
concentration due to one high
nondetect; defer monitoring to
LTMP.
Total Zinc
No requirement
MA, DM = 238 µg/L
Monitor monthly
WQBEL. RP found
Monitor quarterly at
Hardness -dependent dissolved
Total Hardness
effluent and instream at
No change
metals water quality standards
U
approved in 2016.
Add quarterly
PFAS
No requirement
monitoring with
EPA recommendations (guidance
delayed
memo, 12/5/2022).
implementation
Chronic limit at 90%
WQBEL. No toxics in toxic
Toxicity Test
effluent
No change
amounts. 15A NCAC 213.0200 and
15A NCAC 0213.0500
Page 15 of 16

Paramete
Current Permit 1
Proposed Change
Basis for Condition/Change
Effluent Pollutant
Three times per permit
Update sample years
40 CFR 122
Scan
cycle
to 2025, 2026, 2027
Mercury
Modify condition
WQBEL. Consistent with 2012
Minimization Plan
Special Condition
toward MMP
Statewide Mercury TMDL
(MMP)
maintenance
Implementation.
Electronic
Special Condition
Update Special
In accordance with EPA Electronic
Reporting
Condition
Reporting Rule 2015.
Footnote.
1. MGD = Million Gallons per Day; MA = Monthly Average; WA = Weekly Average; DA = Daily Average;
DM = Daily Maximum; QA = Quarterly Average.
Table 8. Current Permit Conditions and Proposed Changes 6.0 MGD.
Parameter
Current Permit 1
Proposed Change
Basis for Condition/Change
Flow
MA 6.0 MGD
Monitor continuously
No change
15A NCAC 02B .0505
Summer:
MA = 5.0 mg/L
WA = 7.5 mg/L
WQBEL. Based on protection of
BOD5
Winter:
No change
DO standard. 15A NCAC 02B. 0200
MA = 10.0 mg/L
WA = 15.0 mg/L
Monitor daily
MA = 30.0 mg/L
TBEL. Secondary treatment
TSS
WA = 45.0 mg/L
No change
standards, 40 CFR 133, 15A NCAC
Monitor daily
02B .0406
Summer:
MA = 1.0 mg/L
WA = 3.0 mg/L
WQBEL. Based on protection of
NH3-N
Winter:
No change
State WQ criteria. 15A NCAC 02B.
MA = 2.0 mg/L
0200, .0508
WA = 6.0 mg/L
Monitor daily
MA = 200 /100 mL
WQBEL. State WQ standard, 15A
Fecal Coliform
WA = 400 /100 mL
No change
NCAC 2B .0200, .0508
Monitor daily
TRC
DM = 17 µg/L
No change
WQBEL. State WQ standard, 15A
Monitor daily
NCAC 2B .0200, .0508
DA > 6 mg/L
WQBEL. State WQ standard, 15A
Monitor effluent daily
NCAC 02B .0200, .0500. Instream
DO
Monitor instream
No change
monitoring based on 1990
monthly, including
recommendations from 1988
summer depth profiles at
Instream Assessment regarding Kerr
D 1 and D2
Lake trophic concerns.
Page 16 of 17

Parameter
Current Permit 1
Proposed Change
Basis for Condition/Change
Monitor effluent daily
State monitoring requirements, 15A
Monitor instream
NCAC 02B .0508. Instream
Temperature
monthly, including
No change
monitoring based on 1990
recommendations from 1988
summer depth profiles at
Instream Assessment regarding Kerr
D1 and D2
Lake trophic concerns.
Monitor effluent daily
State monitoring requirements, 15A
Conductivity
Monitor instream
No change
B NCAC 02.0508.
monthly
pH
6.0 — 9.0 SU
No change
WQBEL. State WQ standard, 15A
Monitor daily
NCAC 2B .0200, .0508
Total Nitrogen
Monitor effluent
No change
State monitoring requirements, 15A
monthly
NCAC 213.0500.
Add monthly effluent
Monitor instream
monitoring.Increase instream
To better understand effluent TN
TKN
monthly at D1, D2 in
sampling year-
concentrations and effluent impact
summer
round; add monthly
on instream concentrations.
upstream monitoring.
Add monthly effluent
Monitor instream
monitoring.
Increase instream
To better understand effluent TN
NO2+NO3
monthly at D1, D2 in
sampling to year-
concentrations and effluent impact
summer
round; add monthly
on instream concentrations.
upstream monitoring.
Summer:
QA = 1.0 mg/L
Winter:
Increase instream
WQBEL. Originally based on 1988
QA = 1.5 mg/L
sampling to year-
WLA, modified per City request in
Total Phosphorus
Monitor weekly
round; add monthly
1989. Upstream monitoring to better
Monitor instream
upstream monitoring.
understand effluent impact on
monthly at D1, D2 in
instream concentrations.
summer
MA = 26.7 µg/L
No reasonable potential (RP) to
Total Copper
DM = 39.9 µg/L
Remove from permit
exceed stream WQ standard found
Monitor monthly
in RPA.
Total Silver
Monitor quarterly
Remove from permit
No RP found; all data were
nondetects.
No RP found; maximum predicted
value > 50% allowable
Total Selenium
Monitor quarterly
Remove from permit
concentration due to one high
nondetect; defer monitoring to
LTMP.
Total Zinc
No requirement
MA, DM = 235 µg/L
Monitor monthly
WQBEL. RP found
Page 17 of 18

Parameter
Current Permit 1
Proposed Change
Basis for Condition/Change
Monitor quarterly at
Hardness -dependent dissolved
Total Hardness
effluent and instream at
No change
metals water quality standards
U
approved in 2016.
Add quarterly
PFAS
No requirement
monitoring with
EPA recommendations (guidance
delayed
memo, 12/5/2022).
implementation
Chronic limit, 90%
WQBEL. No toxics in toxic
Toxicity Test
effluent
No change
amounts. 15A NCAC 0213.0200,
.0508
Reduce to three times
Effluent Pollutant
per permit cycle; add
Scan
Annual
to 1st 3 yrs after 6.0
40 CFR 122
MGD expansion
complete.
Mercury
Modify condition
WQBEL. Consistent with 2012
Minimization Plan
Special Condition
toward MMP
Statewide Mercury TMDL
(MMP)
maintenance
Implementation.
Electronic
No requirement
Add Electronic
Reporting Special
In accordance with EPA Electronic
Reporting
Condition
Reporting Rule 2015.
Footnote.
1. MGD = Million Gallons per Day; MA = Monthly Average; WA = Weekly Average; DA = Daily Average;
DM = Daily Maximum; QA = Quarterly Average.
13. Public Notice Schedule:
Permit to Public Notice: xx/xx/xxxx
Per 15A NCAC 2H .0109 & .0111, The Division will receive comments for a period of 30 days following
the publication date of the public notice. Any request for a public hearing shall be submitted to the
Director within the 30 days comment period indicating the interest of the party filing such request and the
reasons why a hearing is warranted.
14. NPDES Division Contact
If you have any questions regarding any of the above information or on the attached permit, please
contact Gary Perlmutter at [phone] or via email at gary_perlmutterkdeq.nc.gov.
15. Fact Sheet Addendum (if applicable):
Were there any changes made since the Draft Permit was public noticed (Yes/No): NO
If Yes, list changes and their basis below: NA
Page 18 of 19

16. Fact Sheet Attachments (if applicable):
• Effluent Pollutant Scans, 2020, 2021, 2022
2nd species WET test reports, 2019, 2020, 2021, 2022
• MMP summary
• Process Narrative
0 Sludge Management Plan
0 Chemical Addendum note
• NPDES Pretreatment POC form
• 2022 NC 303(d) list of impaired waters, p. 103
• 2022 Integrated Report, p. 848
• Fish Community Sample report, NF28
0 Correspondence with DWR Basin Planning Branch
• Monitoring Violations Report
• EPA ECHO detailed facility report
• WET test summary sheet, p. 49
• Compliance Inspection report, 6/7/2023
• Pretreatment Inspection report, 8/24/2021
• NH3/TRC WLA Calculations for 4.14 and 6.0 MGD
• RPA Spreadsheet Summary for 4.14 and 6.0 MGD
• NPDES Dissolved Metals Fact Sheet memo
• Mercury TMDL Evaluation for 4.14 and 6.0 MGD
Page 19 of 19

Annual Monitoring and Pollutant Scan
Permit No. NCO020559 Month April
Outfall 001 Year 2021
Facility Name City of Henderson WRF ORC Clarissa Lipscomb
Date of sampling 4/8/2021 Phone [phone]
Analytical Laboratory HWRF Lab, Meritech
Parameter
Parameter
Code
Sample
Type
Analytical Method
Quantitation
Level
Sample
Result
Units of
Measurement
Ammonia (as N)
C0610
Composite
SM 4500 NH3 D-2011
0.1
ND
mg/L
µg/L
Chlorine (total residual, TRC)
50060
Grab
SM 4500 Cl G-2011
16
ND
Dissolved Oxygen
00300
Grab
SM 4500 0 G-2011
1.0
9.0
mg/L
Nitrite plus Nitrate Total (as N)
00630
Composite
EPA 353.2
0.1
4.71
mg/L
Total Kjeldahl Nitrogen
00625
Composite
EPA 351.1
0.2
0.93
mg/L
Oil and Grease
00556
Grab
EPA 1664B
5
ND
mg/L
Total Phosphorus
C0665
Composite
EPA 200.7
0.02
1 0.08
mg/L
Total Dissolved Solids
Hardness
70295
Composite
SM 2540 C
10
368
mg/L
00900
Composite
SM 2340 B
1
64
mg/L
Metals (total recoverable), cyanide and total phenols
Antimony
Arsenic
Beryllium
01097
Composite
EPA 200.8
0.5
0.6
µg/L
01002
Composite
EPA 200.8
2
ND
µg/L
01012
Composite
EPA 200.8
0.5
ND
µg/L
Cadmium
01027
Composite
EPA 200.8
0.15
ND
µg/L
Chromium
01034
Composite
EPA 200.8
2
ND
µg/L
Copper
01042
Composite
EPA 200.8
2
ND
µg/L
Lead
01051
Composite
EPA 200.8
0.5
ND
µg/L
Mercury (Method 1631E)
COMER
Grab
1631E
0.0010
0.00173
µg/L
Nickel
01067
Composite
EPA 200.8
0.5
8.5
µg/L
Selenium
01147
Composite
EPA 200.8
1
ND
µg/L
Silver
01077
Composite
EPA 200.8
0.5
ND
µg/L
Thallium
01059
Composite
EPA 200.8
0.5
ND
µg/L
Zinc
01092
Composite
EPA 200.8
15
145
µg/L
Cyanide
00720
Grab
EPA 335.4
0.005
ND
mg/L
Total phenolic compounds
32730
Grab
EPA 420.1
0.010
ND
mg/L
Volatile organic compounds
Acrolein 34210
Acrylonitrile 34215
Grab EPA 624.1
50
ND µg/L
Grab
EPA 624.1
10
ND
µg/L
Benzene
34030
Grab
EPA 624.1
1.00
ND
µg/L
Bromoform
32104
Grab
EPA 624.1
1.00
ND
µg/L
Carbon Tetrachloride
32102
Grab
EPA 624.1
1.00
ND
µg/L
Chlorobenzene
34301
Grab
EPA 624.1
1.00
ND
µg/L
Chlorodibromomethane
34306
Grab
EPA 624.1
1.00
ND
µg/L
Chloroethane
85811
Grab
EPA 624.1
5.00
ND
µg/L
2-chloroethyl vinyl ether
34576
Grab
EPA 624.1
5.00
ND
µg/L
Chloroform
32106
Grab
EPA 624.1
1.00
ND
µg/L
Dichlorobromomethane
32101
Grab
EPA 624.1
1.00
ND
µg/L
1, 1 -dichloroethane
34496
Grab
EPA 624.1
1.00
ND
µg/L
1,2-dichloroethane
32103
Grab
EPA 624.1
1.00
ND
µg/L
Trans-1,2-dichloroethylene
34546
Grab
EPA 624.1
1.00
ND
µg/L
1, 1 -dichloroethylene
34501
Grab
EPA 624.1
1.00
ND
µg/L
1,2-dichloropropane
34541
Grab
EPA 624.1
1.00
ND
µg/L
1,3-dichloropropylene
77163
Grab
EPA 624.1
1.00
ND
µg/L
Ethylbenzene
34371
Grab
EPA 624.1
1 1.00
ND
µg/L
Methyl Bromide
34413
Grab
EPA 624.1
1 5.00
ND
µg/L
Form - DMR- PPA-1 Page 1

Annual Monitoring and Pollutant Scan
Permit No. NCO020559 Month April
Outfall 001 Year 2021
Parameter am
Parameter
Code
Sample
Type
Grab
Analytical Method
Quantitation
Level
5.00
Sample
Result
Units of
Measurement
Methyl Chloride
34418
EPA 624.1
ND
µg/L
Methylene Chloride
34423
Grab
EPA 624.1
1.00
ND
µg/L
1,1,2,2-tetrachloroethane
81549
Grab
EPA 624.1
1.00
ND
µg/L
Tetrachloroethylene
34475
Grab
EPA 624.1
1.00
ND
µg/L
Toluene
34010
Grab
EPA 624.1
1.00
ND
µg/L
1, 1, 1 -trichloroethane
34506
Grab
EPA 624.1
1.00
ND
µg/L
1,1,2-trichloroethane
34511
Grab
EPA 624.1
1.00
ND
µg/L
Trichloroethylene
39180
Grab
EPA 624.1
1.00
ND
µg/L
Vinyl Chloride
39175
Grab
EPA 624.1
5.00
ND
µg/L
P-chloro-m-creso
34452
Grab
EPA 625.1
10
ND
µg/L
2-chlorophenol
34586
Grab
EPA 625.1
10
ND
µg/L
2,4-dichlorophenol
34601
Grab
EPA 625.1
10
ND
µg/L
2,4-dimethylphenol
34606
Grab
EPA 625.1
10
ND
µg/L
4,6-dinitro-o-cresol
34657
Grab
EPA 625.1
50
ND
µg/L
2,4-dinitrophenol
34616
Grab
EPA 625.1
50
ND
µg/L
2-nitrophenol
34591
Grab
EPA 625.1
10
ND
µg/L
4-nitrophenol
34646
Grab
EPA 625.1
50
ND
µg/L
Pentachlorophenol
39032
Grab
EPA 625.1
50
ND
µg/L
Phenol
34694
Grab
EPA 625.1
10
ND
µg/L
2,4,6-trichlorophenol
34621
Grab
EPA 625.1
10
ND
µg/L
Base -neutral compounds
Acenaphthene
34205
Grab
EPA 625.1
10
ND
µg/L
Acenaphthylene
34200
Grab
EPA 625.1
10
ND
µg/L
Anthracene
CO220
Grab
EPA 625.1
10
ND
µg/L
Benzidine
39120
Grab
EPA 625.1
50
ND
µg/L
Benzo(a)anthracene
34526
Grab
EPA 625.1
10
ND
µg/L
Benzo(a)pyrene
34247
Grab
EPA 625.1
10
ND
µg/L
3,4 benzofluoranthene
34230
Grab
EPA 625.1
10
ND
µg/L
Benzo(ghi)perylene
34521
Grab
EPA 625.1
10
ND
µg/L
Benzo(k)fluoranthene
34242
Grab
EPA 625.1
10
ND
µg/L
Bis (2-chloroethoxy) methane
34278
Grab
EPA 625.1
10
ND
µg/L
Bis (2-chloroethyl) ether
34273
Grab
EPA 625.1
10
ND
µg/L
Bis (2-chloroisopropyl) ether
34283
Grab
EPA 625.1
10
ND
µg/L
Bis (2-ethylhexyl) phthalate
39100
Grab
EPA 625.1
10
ND
µg/L
4-bromophenyl phenyl ether
34636
Grab
EPA 625.1
10
ND
µg/L
Butyl benzyl phthalate
34292
Grab
EPA 625.1
10
ND
µg/L
2-chloronaphthalene
34581
Grab
EPA 625.1
10
ND
µg/L
4-chlorophenyl phenyl ether
34641
Grab
EPA 625.1
10
ND
µg/L
Chrysene
34320
Grab
EPA 625.1
10
ND
µg/L
Di-n-butyl phthalate
39110
Grab
EPA 625.1
10
ND
µg/L
Di-n-octyl phthalate
34596
Grab
EPA 625.1
10
ND
µg/L
Dibenzo(a,h)anthracene
34556
Grab
EPA 625.1
10
ND
µg/L
1,2-dichlorobenzene
34536
Grab
EPA 625.1
10
ND
µg/L
1,3-dichlorobenzene
34566
Grab
EPA 625.1
10
ND
µg/L
1,4-dichlorobenzene
34571
Grab
EPA 625.1
10
ND
µg/L
3,3-dichlorobenzidine
34631
Grab
EPA 625.1
50
ND
µg/L
Diethyl phthalate
34336
Grab
EPA 625.1
10
ND
µg/L
Dimethyl phthalate
34341
Grab
EPA 625.1
10
ND
µg/L
2,4-dinitrotoluene
34611
Grab
EPA 625.1
10
ND
µg/L
Form - DMR- PPA-1 Page 2

Annual Monitoring and Pollutant Scan
Permit No. NCO020559 Month April
Outfall 001 Year 2021
Parameter
Parameter
Code
Sample
Type
Grab
Analytical Method
Quantitation
Level
10
Sample
Result
Units of
Measurement
2,6-dinitrotoluene
C0626
EPA 625.1
ND
µg/L
1,2-dipheny1hydrazine
34346
Grab
EPA 625.1
10
ND
µg/L
Fluoranthene
C0376
Grab
EPA 625.1
10
ND
µg/L
Fluorene
34381
Grab
EPA 625.1
10
ND
µg/L
Hexachlorobenzene
C0700
Grab
EPA 625.1
10
ND
µg/L
Hexachlorobutadiene
39702
Grab
EPA 625.1
10
ND
µg/L
Hexachlorocyclo-pentadiene
34386
Grab
EPA 625.1
50
ND
µg/L
Hexachloroethane
34396
Grab
EPA 625.1
10
ND
µg/L
Indeno(1,2,3-cd)pyrene
34403
Grab
EPA 625.1
10
ND
µg/L
Isophorone
34408
Grab
EPA 625.1
10
ND
µg/L
Naphthalene
34696
Grab
EPA 625.1
10
ND
µg/L
Nitrobenzene
34447
Grab
EPA 625.1
10
ND
µg/L
N-nitrosodi-n-propylamine
34428
Grab
EPA 625.1
10
ND
µg/L
N-nitrosodimethylamine
34438
Grab
EPA 625.1
10
ND
µg/L
N-nitrosodiphenylamine
34433
Grab
EPA 625.1
10
ND
µg/L
Phenanthrene
34461
Grab
EPA 625.1
10
ND
µg/L
Pyrene
34469
Grab
EPA 625.1
10
ND
µg/L
1,2,4,-trichlorobenzene
34551
Grab
EPA 625.1
10
ND
µg/L
"I certify, under penalty of law, that this document and all attachments were prepared under my direction or supervision in accordance with a
system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person
or persons who managed the system, or those persons directly responsible for gathering the information, the information submitted is, to the
best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information,
including the possibility of fines and imprisonment for knowing violations."
Authorized Representative name
Signature
Date
Form - DMR- PPA-1 Page 3

Annual Monitoring and Pollutant Scan
Permit No. NCO020559 Month January
Outfall 001 Year 2020
Facility Name City of Henderson WRF ORC H Lamont Allen
Date of sampling 1/9/20 Phone [phone]
Analytical Laboratory HWRF Lab, Meritech
Parameter 0
Parameter
Code
Sample
Type
Analytical Method
Quantitation
Level
Sample
Result
Units of
Measurement
Ammonia (as N)
C0610
Composite
SM 4500 NH3 D-2011
0.1
0.2
mg/L
µg/L
Chlorine (total residual, TRC)
50060
Grab
SM 4500 Cl G-2011
16
ND
Dissolved Oxygen
00300
Grab
SM 4500 0 G-2011
1.0
9.2
mg/L
Nitrite plus Nitrate Total (as N)
00630
Composite
EPA 353.2
0.1
7.17
mg/L
Total Kjeldahl Nitrogen
00625
Composite
EPA 351.1
0.2
ND
mg/L
Oil and Grease
00556
Grab
EPA 1664B
5
ND
mg/L
Total Phosphorus
C0665
Composite
EPA 200.7
10.02
10.06
1mg/L
Total Dissolved Solids
Hardness
70295
Composite
SM 2540 C
10
174
mg/L
00900
Composite
SM 2340 B
1
56
mg/L
Metals (total recoverable), cyanide and total phenols
Antimony
Arsenic
Beryllium
01097
Composite
EPA 200.8
0.5
ND
µg/L
01002
Composite
EPA 200.8
2
ND
µg/L
01012
Composite
EPA 200.8
0.5
ND
µg/L
Cadmium
01027
Composite
EPA 200.8
0.15
ND
µg/L
Chromium
01034
Composite
EPA 200.8
2
ND
µg/L
Copper
01042
Composite
EPA 200.8
2
ND
µg/L
Lead
01051
Composite
EPA 200.8
0.5
ND
µg/L
Mercury (Method 1631E)
COMER
Grab
1631E
0.0010
ND
µg/L
Nickel
01067
Composite
EPA 200.8
0.5
2.0
µg/L
Selenium
01147
Composite
EPA 200.8
1
ND
µg/L
Silver
01077
Composite
EPA 200.8
0.5
ND
µg/L
Thallium
01059
Composite
EPA 200.8
0.5
ND
µg/L
Zinc
01092
Composite
EPA 200.8
5
18
µg/L
Cyanide
00720
Grab
EPA 335.4
0.005
0.007
mg/L
Total phenolic compounds
32730
Grab
EPA 420.1
0.010
0.011
mg/L
Volatile organic compounds
Acrolein 34210
Acrylonitrile 34215
Grab EPA 624.1
50
ND
µg/L
Grab
EPA 624.1
10
ND
µg/L
Benzene
34030
Grab
EPA 624.1
1.00
ND
µg/L
Bromoform
32104
Grab
EPA 624.1
1.00
ND
µg/L
Carbon Tetrachloride
32102
Grab
EPA 624.1
1.00
ND
µg/L
Chlorobenzene
34301
Grab
EPA 624.1
1.00
ND
µg/L
Chlorodibromomethane
34306
Grab
EPA 624.1
1.00
ND
µg/L
Chloroethane
85811
Grab
EPA 624.1
5.00
ND
µg/L
2-chloroethyl vinyl ether
34576
Grab
EPA 624.1
5.00
ND
µg/L
Chloroform
32106
Grab
EPA 624.1
1.00
ND
µg/L
Dichlorobromomethane
32101
Grab
EPA 624.1
1.00
ND
µg/L
1, 1 -dichloroethane
34496
Grab
EPA 624.1
1.00
ND
µg/L
1,2-dichloroethane
32103
Grab
EPA 624.1
1.00
ND
µg/L
Trans-1,2-dichloroethylene
34546
Grab
EPA 624.1
1.00
ND
µg/L
1, 1 -dichloroethylene
34501
Grab
EPA 624.1
1.00
ND
µg/L
1,2-dichloropropane
34541
Grab
EPA 624.1
1.00
ND
µg/L
1,3-dichloropropylene
77163
Grab
EPA 624.1
1.00
ND
µg/L
Ethylbenzene
34371
Grab
EPA 624.1
1.00
ND
µg/L
Methyl Bromide
34413
Grab
EPA 624.1
5.00
ND
µg/L
Form - DMR- PPA-1 Page 1

Annual Monitoring and Pollutant Scan
Permit No. NCO020559 Month January
Outfall _001 Year 2020
Parameter am
Parameter
Code
Sample
Type
Grab
Analytical Method
Quantitation
Level
5.00
Sample
Result
ND
Units of
Measurement
Methyl Chloride
34418
EPA 624.1
µg/L
Methylene Chloride
34423
Grab
EPA 624.1
1.00
ND
µg/L
1,1,2,2-tetrachloroethane
81549
Grab
EPA 624.1
1.00
ND
µg/L
Tetrachloroethylene
34475
Grab
EPA 624.1
1.00
ND
µg/L
Toluene
34010
Grab
EPA 624.1
1.00
ND
µg/L
1, 1, 1 -trichloroethane
34506
Grab
EPA 624.1
1.00
ND
µg/L
1,1,2-trichloroethane
34511
Grab
EPA 624.1
1.00
ND
µg/L
Trichloroethylene
39180
Grab
EPA 624.1
1.00
ND
µg/L
Vinyl Chloride 39175
Acid -extractable compounds
P-chloro-m-creso 34452
2-chlorophenol 34586
Grab
Grab
EPA 624.1
EPA 625.1
1.00
10
ND
ND
µg/L
µg/L
Grab
EPA 625.1
10
ND
µg/L
2,4-dichlorophenol
34601
Grab
EPA 625.1
10
ND
µg/L
2,4-dimethylphenol
34606
Grab
EPA 625.1
10
ND
µg/L
4,6-dinitro-o-cresol
34657
Grab
EPA 625.1
50
ND
µg/L
2,4-dinitrophenol
34616
Grab
EPA 625.1
50
ND
µg/L
2-nitrophenol
34591
Grab
EPA 625.1
10
ND
µg/L
4-nitrophenol
34646
Grab
EPA 625.1
50
ND
µg/L
Pentachlorophenol
39032
Grab
EPA 625.1
50
ND
µg/L
Phenol
34694
Grab
EPA 625.1
10
ND
µg/L
2,4,6-trichlorophenol
34621
Grab
EPA 625.1
10
ND
µg/L
Base -neutral compounds
Acenaphthene
34205
34200
Grab
EPA 625.1
10
ND
µg/L
Acenaphthylene
Grab
EPA 625.1
10
ND
µg/L
Anthracene
CO220
Grab
EPA 625.1
10
ND
µg/L
Benzidine
39120
Grab
EPA 625.1
50
ND
µg/L
Benzo(a)anthracene
34526
Grab
EPA 625.1
10
ND
µg/L
Benzo(a)pyrene
34247
Grab
EPA 625.1
10
ND
µg/L
3,4 benzofluoranthene
34230
Grab
EPA 625.1
10
ND
µg/L
Benzo(ghi)perylene
34521
Grab
EPA 625.1
10
ND
µg/L
Benzo(k)fluoranthene
34242
Grab
EPA 625.1
10
ND
µg/L
Bis (2-chloroethoxy) methane
34278
Grab
EPA 625.1
10
ND
µg/L
Bis (2-chloroethyl) ether
34273
Grab
EPA 625.1
10
ND
µg/L
Bis (2-chloroisopropyl) ether
34283
Grab
EPA 625.1
10
ND
µg/L
Bis (2-ethylhexyl) phthalate
39100
Grab
EPA 625.1
10
ND
µg/L
4-bromophenyl phenyl ether
34636
Grab
EPA 625.1
10
ND
µg/L
Butyl benzyl phthalate
34292
Grab
EPA 625.1
10
ND
µg/L
2-chloronaphthalene
34581
Grab
EPA 625.1
10
ND
µg/L
4-chlorophenyl phenyl ether
34641
Grab
EPA 625.1
10
ND
µg/L
Chrysene
34320
Grab
EPA 625.1
10
ND
µg/L
Di-n-butyl phthalate
39110
Grab
EPA 625.1
10
ND
µg/L
Di-n-octyl phthalate
34596
Grab
EPA 625.1
10
ND
µg/L
Dibenzo(a,h)anthracene
34556
Grab
EPA 625.1
10
ND
µg/L
1,2-dichlorobenzene
34536
Grab
EPA 625.1
10
ND
µg/L
1,3-dichlorobenzene
34566
Grab
EPA 625.1
10
ND
µg/L
1,4-dichlorobenzene
34571
Grab
EPA 625.1
10
ND
µg/L
3,3-dichlorobenzidine
34631
Grab
EPA 625.1
50
ND
µg/L
Diethyl phthalate
34336
Grab
EPA 625.1
10
ND
µg/L
Dimethyl phthalate
34341
Grab
EPA 625.1
10
ND
µg/L
2,4-dinitrotoluene
34611
Grab
EPA 625.1
10
ND
µg/L
Form - DMR- PPA-1 Page 2

Annual Monitoring and Pollutant Scan
Permit No. NCO020559 Month January
Outfall _001 Year 2020
Parameter
Parameter
Code
Sample
Type
Grab
Analytical Method
Quantitation
Level
10
Sample
Result
Units of
Measurement
2,6-dinitrotoluene
C0626
EPA 625.1
ND
µg/L
1,2-dipheny1hydrazine
34346
Grab
EPA 625.1
10
ND
µg/L
Fluoranthene
C0376
Grab
EPA 625.1
10
ND
µg/L
Fluorene
34381
Grab
EPA 625.1
10
ND
µg/L
Hexachlorobenzene
C0700
Grab
EPA 625.1
10
ND
µg/L
Hexachlorobutadiene
39702
Grab
EPA 625.1
10
ND
µg/L
Hexachlorocyclo-pentadiene
34386
Grab
EPA 625.1
50
ND
µg/L
Hexachloroethane
34396
Grab
EPA 625.1
10
ND
µg/L
Indeno(1,2,3-cd)pyrene
34403
Grab
EPA 625.1
10
ND
µg/L
Isophorone
34408
Grab
EPA 625.1
10
ND
µg/L
Naphthalene
34696
Grab
EPA 625.1
10
ND
µg/L
Nitrobenzene
34447
Grab
EPA 625.1
10
ND
µg/L
N-nitrosodi-n-propylamine
34428
Grab
EPA 625.1
10
ND
µg/L
N-nitrosodimethylamine
34438
Grab
EPA 625.1
10
ND
µg/L
N-nitrosodiphenylamine
34433
Grab
EPA 625.1
10
ND
µg/L
Phenanthrene
34461
Grab
EPA 625.1
10
ND
µg/L
Pyrene
34469
Grab
EPA 625.1
10
ND
µg/L
1,2,4,-trichlorobenzene
34551
Grab
EPA 625.1
10
ND
µg/L
"I certify, under penalty of law, that this document and all attachments were prepared under my direction or supervision in accordance with a
system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person
or persons who managed the system, or those persons directly responsible for gathering the information, the information submitted is, to the
best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information,
including the possibility of fines and imprisonment for knowing violations."
Authorized Representative name
Signature
Date
Form - DMR- PPA-1 Page 3

Annual Monitoring and Pollutant Scan
Permit No. Month
Outfall Year
Facility Name City of Henderson WRF ORC Clarissa Lipscomb
Date of sampling 7/21/2022 Phone [phone]
Analytical Laboratory HWRF Lab, Meritech
Parameter
Parameter
Code
Sample Type
Analytical Method
Quantitation
Level
Sample
Result
Units of
Measurement
Ammonia (as N)
C0610
Composite
SM 4500 NH3 D-2011
0.1
0.2
mg/L
µg/L
Chlorine (total residual, TRC)
50060
Grab
SM 4500 Cl G-2011
16
Dissolved Oxygen
00300
Grab
SM 4500 O G-2011
1.0
6.6
mg/L
Nitrite plus Nitrate Total (as N)
00630
Composite
EPA 353.2
0.1
1.6
mg/L
Total Kjeldahl Nitrogen
00625
Composite
EPA 351.1
0.2
0.7
mg/L
Oil and Grease
00556
Grab
EPA 1664B
5
ND
mg/L
Total Phosphorus
C0665
Composite
I EPA 200.7
0.02
1 0.121
1 mg/L
Total Dissolved Solids
Hardness
Metals (total recoverable), cyanide
Antimony
Arsenic
Beryllium
Cadmium
70295
Composite
SM 2540 C
10
179
mg/L
00900
and total phenols
01097
Composite
Composite
SM 2340 B
EPA 200.8
1
0.5
40
ND
mg/L
µg/L
01002
Composite
EPA 200.8
2
ND
µg/L
01012
Composite
EPA 200.8
0.5
ND
µg/L
01027
Composite
EPA 200.8
0.15
ND
µg/L
Chromium
01034
Composite
EPA 200.8
2
ND
µg/L
Copper
01042
Composite
EPA 200.8
2
ND
µg/L
Lead
01051
Composite
EPA 200.8
0.5
ND
µg/L
Mercury (Method 1631E)
COMER
Grab
1631E
0.0010
ND
µg/L
Nickel
01067
Composite
EPA 200.8
0.5
3.0
µg/L
Selenium
01147
Composite
EPA 200.8
1
ND
µg/L
Silver
01077
Composite
EPA 200.8
0.5
ND
µg/L
Thallium
01059
Composite
EPA 200.8
0.5
ND
µg/L
Zinc
01092
Composite
EPA 200.8
5
29
µg/L
Cyanide
00720
Grab
EPA 335.4
0.005
ND
mg/L
Total phenolic compounds 32730
Volatile organic compounds
Acrolein 34210
Acrylonitrile 34215
Benzene 34030
Grab
Grab
EPA 420.1
EPA 624.1
0.010
50
0.019
ND
mg/L
µg/L
Grab
EPA 624.1
10
ND
µg/L
Grab
EPA 624.1
1.00
ND
µg/L
Bromoform
32104
Grab
EPA 624.1
1.00
ND
µg/L
Carbon Tetrachloride
32102
Grab
EPA 624.1
1.00
ND
µg/L
Chlorobenzene
34301
Grab
EPA 624.1
1.00
ND
µg/L
Chlorodibromomethane
34306
Grab
EPA 624.1
1.00
ND
µg/L
Chloroethane
85811
Grab
EPA 624.1
5.00
ND
µg/L
2-chloroethyl vinyl ether
34576
Grab
EPA 624.1
5.00
ND
µg/L
Chloroform
32106
Grab
EPA 624.1
1.00
ND
µg/L
Dichlorobromomethane
32101
Grab
EPA 624.1
1.00
ND
µg/L
1, 1 -dichloroethane
34496
Grab
EPA 624.1
1.00
ND
µg/L
1,2-dichloroethane
32103
Grab
EPA 624.1
1.00
ND
µg/L
Trans-1,2-dichloroethylene
34546
Grab
EPA 624.1
1.00
ND
µg/L
1, 1 -dichloroethylene
34501
Grab
EPA 624.1
1.00
ND
µg/L
1,2-dichloropropane
34541
Grab
EPA 624.1
1.00
ND
µg/L
1,3-dichloropropylene
77163
Grab
EPA 624.1
1.00
ND
µg/L
Ethylbenzene
34371
Grab
EPA 624.1
1.00
ND
µg/L
Methyl Bromide
34413
Grab
EPA 624.1
5.00
ND
µg/L
Form - DMR- PPA-1 Page 1

Annual Monitoring and Pollutant Scan
Permit No. Month
Outfall Year
Parameter
Parameter
Code
Sample Type
Grab
Analytical Method
EPA 624.1
Quantitation
Level
Sample
Result
ND
Units of
Measurement
µg/L
Methyl Chloride
34418
5.00
Methylene Chloride
34423
Grab
EPA 624.1
1.00
ND
µg/L
1,1,2,2-tetrachloroethane
81549
Grab
EPA 624.1
1.00
ND
µg/L
Tetrachloroethylene
34475
Grab
EPA 624.1
1.00
ND
µg/L
Toluene
34010
Grab
EPA 624.1
1.00
ND
µg/L
1, 1, 1 -trichloroethane
34506
Grab
EPA 624.1
1.00
ND
µg/L
1,1,2-trichloroethane
34511
Grab
EPA 624.1
1.00
ND
µg/L
Trichloroethylene
Vinyl Chloride
Acid -extractable compounds
P-chloro-m-creso
2-chlorophenol
39180
Grab
EPA 624.1
1.00
ND
µg/L
39175
34452
Grab
Grab
EPA 624.1
EPA 625.1
5.00
10
ND
ND
µg/L
µg/L
34586
Grab
EPA 625.1
10
ND
µg/L
2,4-dichlorophenol
34601
Grab
EPA 625.1
10
ND
µg/L
2,4-dimethylphenol
34606
Grab
EPA 625.1
10
ND
µg/L
4,6-dinitro-o-cresol
34657
Grab
EPA 625.1
50
ND
µg/L
2,4-dinitrophenol
34616
Grab
EPA 625.1
50
ND
µg/L
2-nitrophenol
34591
Grab
EPA 625.1
10
ND
µg/L
4-nitrophenol
34646
Grab
EPA 625.1
50
ND
µg/L
Pentachlorophenol
39032
Grab
EPA 625.1
50
ND
µg/L
Phenol
34694
Grab
EPA 625.1
10
ND
µg/L
2,4,6-trichlorophenol
Base -neutral compounds
Acenaphthene
34621
34205
Grab
Grab
EPA 625.1
EPA 625.1
10
10
ND
ND
µg/L
µg/L
Acenaphthylene
34200
Grab
EPA 625.1
10
ND
µg/L
Anthracene
CO220
Grab
EPA 625.1
10
ND
µg/L
Benzidine
39120
Grab
EPA 625.1
50
ND
µg/L
Benzo(a)anthracene
34526
Grab
EPA 625.1
10
ND
µg/L
Benzo(a)pyrene
34247
Grab
EPA 625.1
10
ND
µg/L
3,4 benzofluoranthene
34230
Grab
EPA 625.1
10
ND
µg/L
Benzo(ghi)perylene
34521
Grab
EPA 625.1
10
ND
µg/L
Benzo(k)fluoranthene
34242
Grab
EPA 625.1
10
ND
µg/L
Bis (2-chloroethoxy) methane
34278
Grab
EPA 625.1
10
ND
µg/L
Bis (2-chloroethyl) ether
34273
Grab
EPA 625.1
10
ND
µg/L
Bis (2-chloroisopropyl) ether
34283
Grab
EPA 625.1
10
ND
µg/L
Bis (2-ethylhexyl) phthalate
39100
Grab
EPA 625.1
10
ND
µg/L
4-bromophenyl phenyl ether
34636
Grab
EPA 625.1
10
ND
µg/L
Butyl benzyl phthalate
34292
Grab
EPA 625.1
10
ND
µg/L
2-chloronaphthalene
34581
Grab
EPA 625.1
10
ND
µg/L
4-chlorophenyl phenyl ether
34641
Grab
EPA 625.1
10
ND
µg/L
Chrysene
34320
Grab
EPA 625.1
10
ND
µg/L
Di-n-butyl phthalate
39110
Grab
EPA 625.1
10
ND
µg/L
Di-n-octyl phthalate
34596
Grab
EPA 625.1
10
ND
µg/L
Dibenzo(a,h)anthracene
34556
Grab
EPA 625.1
10
ND
µg/L
1,2-dichlorobenzene
34536
Grab
EPA 625.1
10
ND
µg/L
1,3-dichlorobenzene
34566
Grab
EPA 625.1
10
ND
µg/L
1,4-dichlorobenzene
34571
Grab
EPA 625.1
10
ND
µg/L
3,3-dichlorobenzidine
34631
Grab
EPA 625.1
50
ND
µg/L
Diethyl phthalate
34336
Grab
EPA 625.1
10
ND
µg/L
Dimethyl phthalate
34341
Grab
EPA 625.1
10
ND
µg/L
2,4-dinitrotoluene
34611
Grab
EPA 625.1
10
ND
µg/L
Form - DMR- PPA-1 Page 2

Annual Monitoring and Pollutant Scan
Permit No. Month
Outfall Year
Parameter
Parameter
Code
Sample Type
Grab
Analytical Method
EPA 625.1
Quantitation
Level
Sample
Result
ND
Units of
Measurement
µg/L
2,6-dinitrotoluene
C0626
10
1,2-diphenylhydrazine
34346
Grab
EPA 625.1
10
ND
µg/L
Fluoranthene
C0376
Grab
EPA 625.1
10
ND
µg/L
Fluorene
34381
Grab
EPA 625.1
10
ND
µg/L
Hexachlorobenzene
C0700
Grab
EPA 625.1
10
ND
µg/L
Hexachlorobutadiene
39702
Grab
EPA 625.1
10
ND
µg/L
Hexachlorocyclo-pentadiene
34386
Grab
EPA 625.1
50
ND
µg/L
Hexachloroethane
34396
Grab
EPA 625.1
10
ND
µg/L
Indeno(1,2,3-cd)pyrene
34403
Grab
EPA 625.1
10
ND
µg/L
Isophorone
34408
Grab
EPA 625.1
10
ND
µg/L
Naphthalene
34696
Grab
EPA 625.1
10
ND
µg/L
Nitrobenzene
34447
Grab
EPA 625.1
10
ND
µg/L
N-nitrosodi-n-propylamine
34428
Grab
EPA 625.1
10
ND
µg/L
N-nitrosodimethylamine
34438
Grab
EPA 625.1
10
ND
µg/L
N-nitrosodiphenylamine
34433
Grab
EPA 625.1
10
ND
µg/L
Phenanthrene
34461
Grab
EPA 625.1
10
ND
µg/L
Pyrene
34469
Grab
EPA 625.1
10
ND
µg/L
1,2,4,-trichlorobenzene
34551
Grab
EPA 625.1
10
ND
µg/L
Sampling should be conducted as specified in 40 CFR Part 136.
" I certify, under penalty of law, that this document and all attachments were prepared under my direction or supervision in accordance with a
system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or
persons who managed the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of
my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including
the possibility of fines and imprisonment for knowing violations."
Authorized Representative name
Signature
Date
Form - DMR- PPA-1 Page 3

Eif'luent Toxicity Report Form -Chronic Fathead Minnow Multi -Concentration Test Dat9:10/18/2019
Facility: Henderson NPDES # NC00 20559 Pipe #: 001 County: Vance
L o tory: Witech, Inc. (Lab #NCO27) Comments
Signature of Operator in Responsible Charge
x d , /
Signature of Laboratory Supervisor
MAIL ORIGINAL TO: Water Sciences Section
Aquatic Toxicology Branch
Division of Water Resources
1621 Mail Service Center
Raleigh, N.C. 27699-1621
Test Initiation Date/Time 10/8/2019 4:40 PM Avg Wt/Surv. Control 0.506
% Eff. Repl. 1 2 3 4
Control Surviving #
Original #
Wt/original (mg)
22.5 Surviving #
Original #
Wt/original (mg)
10
10
10
Q10
10
10
10
4
0.523
0.489
0.486
10
10
10
10
10
10
10
10
0.526
0.581
0.473
0.504
Survival 100.0
Avg Wt (mg) 0.506
Test Organisms
1R Cultured in -House
FW Outside Supplier
Hatch Date: 10/7/19
Survival 100.0 Hatch Time: 3:00 pm CT
Avg Wt (mg) 0.521
45 Surviving #
% Survival 100.0
10
10
10
10
Original #
10
10
10
10
0.581
0.521
0.650
0.518
90 Surviving #
% Survival 97.5
Original #
Wt/original (mg)
Avg Wt (mg)�.546
95 Surviving #
% Survival 100.0
Original #
Wt/original (mg)
Avg Wt (mg) 0.550
100 Surviving #
% Survival 97.5
Original #
Wt/original (mg)
Avg Wt (mg) 0.566
Nater Quality Data
Day
Control
0
1
2
3
4 5 6
pH (SU) Init/Fin
DO (mg/L) [nit/Fin
Temp (C) Init/Fin
High Concentration
pH (SU) Init/Fin
DO (mg/L) Init/Fin
Temp (C) Init/Fin
Sample
Collection Start Date
Grab
Composite (Duration)
Hardness (mg/L)
Alkalinity (mg/L)
Conductivity (umhos/cm)
Chlorine(mg/L)
Temp. at Receipt (°C)
10
10
10
10
10
10
0.571
0.541
0.569
9
10
10
10
10
10
10
10
0.464
0.650
0.518
0.631
7.92 / 7.70
7.86 / 7.64
7.74
/ 7.84
7.89
/ 7.83
7.98
/ 7.81
7.91
/ 7.68
7.95 / 7.48
7.68 / 7.23
7.74 / 7.20
7.93
/ 7.59
7.86
/ 7.69
7.83
/ 7.91
8.04
/ 7.54
7.97 / 7.06
24.3 / 25.2
24.6 / 25.3
24.3
/ 24.7
24.7
124.9
24.1
125.5
24.2
! 24.7
24.1 ! 24.8
0 1 2 3 4 5 6
7.36 17.48
7.37
/ 7.47
7.23
17.58
7.53
/ 7.73
7.71
/ 7.72
7.76
/ 7.59
7.42
/ 7.45
7.95 / 7.33
8.11
/ 7.10
8.39
17.75
8.10
/ 7.62
7.95
/ 7.97
7.87
/ 7.51
8.21
1 2 3
10/7l2019
10/9/2019
10l10/2019
24.0
24.1
24.8
52
52
52
30
30
28
471
475
480
<0.1
<0.1
<0.1
2.6
2.7
0.8
Dilution H2O Batch # 1441 1442 1443 1444
Hardness (mg/L) 48 46 46 42
Alkalinity (mg/L) 29 31 30 30
Conductivity (umhos/cm) 166 178 173 167
Survival
Growth
Normal
171
F j
Hom. Var.
171
:j
NOEC
100
100
LOEC
>100
>100
ChV
>100
>100
Method
Steel's
Dunnett's
Overall Result
ChV >100
Slats
Survival
Growth
Conc.
Critical Calculated
Critical Calculated
22.5
10 18
2.41-0.3500
45
10 18
2.41-1.3999
90
10 16
2.41-0.9031
95
10 18
2.41-0.9991
100
10 16
2.41-1.3604
10
10
9
10
10
10
10
10
0.658
0.582
0.455
0.487
nia/n c..- AT C /A//lAl '

'Effluent Toxicity Report Form -Chronic Fathead Minnow Multi -Concentration Test Qa, .4/30/2020
Facility: Henderson NPDES # NCOO 20559 Pipe#: 001 County: Vance
2-L-6 4) — - J
Signature of Laboratory Supervisor
MAIL ORIGINAL TO: Water Sciences Section
Aquatic Toxicology Branch
Division ^/ Water Resources
/oo/Mail Service Center
Raleigh, N.c.o,6Yo-mzz
Test |nitieUonDntelTkna 4/21/2020 4:15RN �vgVVU�um�Con�n
% Eff. Repl. 1 u 3 4
Gumiving#
Original #
Wt/original (mg)
Gurviving#
Original #
Wt/original (mg)
Test Organisms
r' Cultured In -House
FW Outside Supplier
Avg N8(mg)���� �0�
^----' ----
%Guwiva| Hatch Time 3:00 mCT
Guwiving#
Y6Survival
OnQmm|#
VVVungina|(ng)
Avg w«(mg)
Gu=wno#
mSumwo
Original # �
~— vvuvngine|(ng)
Avg wm(ng
ourvwnQ#Wt/original (mg) [ 96Gum*a
10
OhQ��|#
Gummm #
%Gmv*al
ongmu|#
Wt/origina/(mg)
Avg mm(mg)
Water Quality Data
Day
Control
n
1
u
n
4
o
s
pH(GU)|nit/Fin
DO(mg/L) |nit/Fin
Temp (C)|nit/Fin
High Concentration
o
1
x
x
4
a
e
pM(GU)!nit/Fio
'/
8O(m0/L)/niUFin
[2
Temp (C)|nit/F)n
. 7
25.5
24.6
/ 25.4 1
2.
Sample
1
2
3
Survival
Growth
Collection Start Date
Grab
Composite (Duration)
*ardnaue(mg/L)
A|ko|inity<mg/L>
Conductivity (umhox/cm)
ChlohmKmg/L)
Temp, at Receipt (T)
Dunnett'stats Survival
s
/L42
)
I
m/utionH20Batch #
Hardneso(mO
Alka|inKy(mQ/L)
Conduct|vity(umhus/cm) IRE] I [___
Normal
/L42
)
I
m/utionH20Batch #
Hardneso(mO
Alka|inKy(mQ/L)
Conduct|vity(umhus/cm) IRE] I [___
Normal
m/utionH20Batch #
Hardneso(mO
Alka|inKy(mQ/L)
Conduct|vity(umhus/cm) IRE] I [___
Normal
F1
��
Hom.Vor.
171
�l
NDEC
100
100
LOEC
—7�0--
-->100—'
ChV
-->100—'
-->100�_
Method
—Steel's--
—

Effluent Toxicity Report Form -Chronic Fathead Minnow Multi -Concentration Test Date:7/23/2021
Facility: Henderson _- NPIDES # NCOO 20559 Pipe #: 001 County: Vance
Labor Meritech, 1pe._(Lab #NP,027) Comments
X
Signatur f or i es=pe Ch_a-rgetErpail/Phone number
X
Signature of Laboratory Supervisor
MAIL ORIGINAL TO: Water Sciences Section
Aquatic Toxicology Branch
Division of Water Resources
1621 Mail Service Center
Raleigh, N.C. 27699-1621
Test Initiation Date/Time 7/13/2021 4:53 PM Avg Wt/Surv. Control F-7-553­1
% Eff. Repl. 1 2 3 4
Control Surviving #
Original #
Wt/original (mg)
22.5 Surviving#
Original #
WUoriginal (mg)
% SurvivalF-977-5­1
Test Organisms
Cultured In -House
Outside Supplier
Avg Wt (mg) I 0.538 1 Hatch Date: 7/12/21
% SurvivaIF97.5 Hatch Time: 4:00-5:00 pm
Avg Wt (mg)F--0.477
r --- 4-5-1 Surviving #
% Survival F90_0__�
10
9
9
8
Original #
10
10
10
1
10
Wt/original (mg)
0.542J
0.439
0,476
0.508
Avg Wt (mg)F0_4_9_1___j
97_Surviving #
% Survival F92 _5___j
Original #
I
Wt/original (mg)
Avg Wt (mg)F- _04_51
79_5Surviving #
�
% Survival 82.5
F
Original #
Wt/original (mg)
Avg Wt (mg) F --- 0-4-4-7-1
100 Surviving #
% Survival F8_50___j
Original #
Wt/original (mg)
Avg Wt (mg) 0.447
Water Quality Data
Day
Control
0
1
2
3
4 5 6
pH (SU) Init/Fin
7.73 / 7.88
7.98 / 7.81
7.68 / 7.72
7.84 / 7.97
7.98 / 7.85
7.96 / 7.58
7,67 17.60
DO (mg/L) Init/Fin
7.79 / 7.80
8.00 / 7.06
7.71 / 7,55
8.06 / 7.62
7.92 / 7.95
8.06 / 7,33
8.07 / 7.05
Temp (C) Init/Fin
24.3 / 24.8
24.2 / 25.2
25.2 / 25.0124.2
/ 24.5
24.9 / 24.9
24.8 / 25.0
24.0 / 24.7
High Concentration
pH (SU) Init/Fin
DO (mg/L) Init/Fin
Temp (C) Init/Fin
Sample
Collection Start Date
Grab
Composite (Duration)
Hardness (mg/L)
Alkalinity (mg/L)
Conductivity (umhos/cm)
Chlorine(mg/L)
Temp. at Receipt (,q
D 1 9 .1 A A A
7.28 / 7.72 7.55 7.68 7.19 / 7.73 7.38 7.77 7.69 / 7.81 7.72 / .75 7.44 / 7.53
8,10 / 7.66 8.20 / 7.32 8.17 / 7.65 8.38 7.55 7.98 / 7.96 8.14 / 7.30 8.36 / 6,96
24.5 / 24,6 1 24
24.5 / 24.6 24.6 / 24.9
1 2 3
7/12/2021 7/1-4/2021 7/15/2021
23.9
24.8
42 46 46
32 30 31
303 361 380
<0. I <0.1 <0. 1
1.4 1,5 1.5
Dilution
Batch #
Hardness (mg/L)
Alkalinity (mg/L)
Conductivity (umhos/cm)
.9 / 25.0 24.8 / 24.7 24.0 243 24.8 / 25.1
Survival Growth
Normal FO I
Hom. Var. F1_1 I
100 100
LOEC >100 >100
ChV >100
Dunnett's ett's
MENUM-7
24.1
Stats Survival Growth
Conc. Critical Calculated Critical Calculated
22.5 2.41 0 2.41 1,4778
45 -
24_1 lA387
41 90 2.41 0.6396 2,41 2.1198
95 2,41 1.9188 241 2.3682
H2.* _4 ' 1 1,599 F2_41
2107
H2O
NOEL
>100
Method
0.9594
100
2.
7.28 / 7.72 7.55 7.68 7.19 / 7.73 7.38 7.77 7.69 / 7.81 7.72 / .75 7.44 / 7.53
8,10 / 7.66 8.20 / 7.32 8.17 / 7.65 8.38 7.55 7.98 / 7.96 8.14 / 7.30 8.36 / 6,96
24.5 / 24,6 1 24
24.5 / 24.6 24.6 / 24.9
1 2 3
7/12/2021 7/1-4/2021 7/15/2021
23.9
24.8
42 46 46
32 30 31
303 361 380
<0. I <0.1 <0. 1
1.4 1,5 1.5
Dilution
Batch #
Hardness (mg/L)
Alkalinity (mg/L)
Conductivity (umhos/cm)
.9 / 25.0 24.8 / 24.7 24.0 243 24.8 / 25.1
Survival Growth
Normal FO I
Hom. Var. F1_1 I
100 100
LOEC >100 >100
ChV >100
Dunnett's ett's
MENUM-7
24.1
Stats Survival Growth
Conc. Critical Calculated Critical Calculated
22.5 2.41 0 2.41 1,4778
45 -
24_1 lA387
41 90 2.41 0.6396 2,41 2.1198
95 2,41 1.9188 241 2.3682
H2.* _4 ' 1 1,599 F2_41
2107
H2O
NOEL
>100
Method
0.9594
100
2.
1 2 3
7/12/2021 7/1-4/2021 7/15/2021
23.9
24.8
42 46 46
32 30 31
303 361 380
<0. I <0.1 <0. 1
1.4 1,5 1.5
Dilution
Batch #
Hardness (mg/L)
Alkalinity (mg/L)
Conductivity (umhos/cm)
.9 / 25.0 24.8 / 24.7 24.0 243 24.8 / 25.1
Survival Growth
Normal FO I
Hom. Var. F1_1 I
100 100
LOEC >100 >100
ChV >100
Dunnett's ett's
MENUM-7
24.1
Stats Survival Growth
Conc. Critical Calculated Critical Calculated
22.5 2.41 0 2.41 1,4778
45 -
24_1 lA387
41 90 2.41 0.6396 2,41 2.1198
95 2,41 1.9188 241 2.3682
H2.* _4 ' 1 1,599 F2_41
2107
H2O
NOEL
>100
Method
0.9594
100
2.
7/12/2021 7/1-4/2021 7/15/2021
23.9
24.8
42 46 46
32 30 31
303 361 380
<0. I <0.1 <0. 1
1.4 1,5 1.5
Dilution
Batch #
Hardness (mg/L)
Alkalinity (mg/L)
Conductivity (umhos/cm)
.9 / 25.0 24.8 / 24.7 24.0 243 24.8 / 25.1
Survival Growth
Normal FO I
Hom. Var. F1_1 I
100 100
LOEC >100 >100
ChV >100
Dunnett's ett's
MENUM-7
24.1
Stats Survival Growth
Conc. Critical Calculated Critical Calculated
22.5 2.41 0 2.41 1,4778
45 -
24_1 lA387
41 90 2.41 0.6396 2,41 2.1198
95 2,41 1.9188 241 2.3682
H2.* _4 ' 1 1,599 F2_41
2107
H2O
NOEL
>100
Method
0.9594
100
2.
Dilution
Batch #
Hardness (mg/L)
Alkalinity (mg/L)
Conductivity (umhos/cm)
.9 / 25.0 24.8 / 24.7 24.0 243 24.8 / 25.1
Survival Growth
Normal FO I
Hom. Var. F1_1 I
100 100
LOEC >100 >100
ChV >100
Dunnett's ett's
MENUM-7
24.1
Stats Survival Growth
Conc. Critical Calculated Critical Calculated
22.5 2.41 0 2.41 1,4778
45 -
24_1 lA387
41 90 2.41 0.6396 2,41 2.1198
95 2,41 1.9188 241 2.3682
H2.* _4 ' 1 1,599 F2_41
2107
H2O
NOEL
>100
Method
0.9594
100
2.
MENUM-7
24.1
Stats Survival Growth
Conc. Critical Calculated Critical Calculated
22.5 2.41 0 2.41 1,4778
45 -
24_1 lA387
41 90 2.41 0.6396 2,41 2.1198
95 2,41 1.9188 241 2.3682
H2.* _4 ' 1 1,599 F2_41
2107
H2O
NOEL
>100
Method
0.9594
100
2.
H2O
NOEL
>100
Method
0.9594
100
2.
0.9594
100
2.

Effluent Toxicity Report Form -Chronic Fathead Minnow Multi -Concentration Test Date:1/24/2022
Facility: Henderson
X I -
Signature of era r in ngib)16e-'C-h-arq-e/-E-m-ai'I/Phone number
x
Signature of Laboratory Supervisor
MAIL ORIGINAL TO: Water Sciences Section
Aquatic Toxicology Branch
Division of Water Resources
1621 Mail Service Center
Raleigh, N.C. 27699-1621
Test Initiation DatefTime 1111/2022 4:50 PM Avg Wt/Surv. Control 0.587
22.5 Surviving#
Original #
Wt/original (mg)
E �51 Surviving #
Original #
WVoriginal (mg)
F 9-0 Surviving#
Original #
Wt/original (mg)
95 Surviving#
Original #
Wt/original (mg)
100 1 Surviving
10
10
9
10
10
Original
10
10
10
10
Wt/original (mg)
0.551
0.449
1 0.575
I0.551
Water Quality Data
Day
Control
0
1
2
3
pH (SU) Init/Fin
7.97 / 7.78
7.88 / 8.04
7.42 / 7.55
.88 / 7.79
DO (mg/L) Init/Fin
Temp (C) [nit/Fin
24�5 / 24.7124.0
/ 24.5
24.9 / 24.5
24.7 / 24.9
% Survival F-7 _00_0____1
Avg Wt (mg)F-70-358-77--�
% Survival F-7 _00_0__�
Avg Wt (mg) F --- 0-5-35--7
% SurvjvaIF1_00_0__�
Avg Wt (mg) F-7354-7--1
% Survival 100.0
Avg Wt (mg) _0
% Survival E-10-0-0-D
Avg Wt (mg)F0_5_1_0
7___j
% Survival F97.5
Avg Wt (mg) F--5-32­1
4 5 6
Test Organisms
i® Cultured In -House
Fv Outside Supplier
Hatch Date: 1110/22
Hatch Time: 4:00-5:00 pm
8,10 / 7.42
7.84 7.71
8.17 / 7.60
8.06 / 8.30
8.49 17.78
High Concentration
0
1
2
3
pH (SU) Init/Fin
DO (mlg/L) Init/Fin
Temp (C) Init/Fin
Sample
Collection Start Date
Grab
Composite (Duration)
Hardness (mg/L)
Alkalinity (mg1L)
Conductivity (umhos/cm)
Chlorine(mg/L)
Temp. at Receipt ('C)
4 5 6
1 2 3
man
mm
Survival
Growth Overall Result
Normal
rl
171 1 ChV >100
Hom. Var.
p JP1
NOEL
100
100
LOEC
>100
>100
ChV
>100
>100
Method
Steel's
Dunnett's
Conc.
22.5
Survival i
Critical Calculated
10 18
18 1
10 18 1
10
�10 16 _�
Growth
i Critical Calculated
2.41 1,1826
2.41 0.9070
2.41 1.2514
2.41 1 7624
2.41 1.2629
45
90
95
100
r)Wrl C-- AT JZ 14111A)

MMP Action Summary
Plan competed 11/15/2019
We completed Industrial Facility Mercury Survey for Mars Pert Care on
11/1/2021.
Recycle Used Fluorescent light tubes through City of Henderson Operation
Center Program.
Eliminated Mercury containing Thermometers.
Eliminated all Mercury containing chemicals in Lab.
City of Henderson WRF Data for Influent and Effluent Mercury Results
Date
Influent Mercury (µ/L)
EPA Method 245.1
Effluent (µ/L)
EPA Method 1631
1/9/2020
<0.2
<0.001
4/22/2020
.0013
4/23/2020
0.8
7/15/2020
0.00597
7/16/2020
<0.2
10/7/2020
0.00114
10/8/2020
<0.2
1/14/2021
0.3
0.00146
2/18/2021
<0.2
2/17/2021
<0.001
3/11/2021
<0.2
<0.001
4/8/2021
<0.2
0.00173
5/5/2021
<0.2
<0.001
6/9/2021
<0.2
0.00327
7/15/2021
<0.2
0.00644
8/4/2021
<0.2
<0.001
9/8/2021
<0.2
<0.001
10/7/2021
<0.2
0.0501
11/3/2021
<0.2
<0.001

12/1/2021
<0.2
<0.001
1/13/2022
<0.2
<0.001
4/7/2022
<0.2
<0.001
7/14/2022
<0.2
7/21/2022
<0.001
10/5/2022
<0.2
<0.001
1/10/2023
<0.2
0.0018
4/5/2023
<0.2
4/26/2023
0.001

Process Narrative
Waste water enters the plant and goes through automatic bar screens. Influent continues
through the grit camber then passes through Parshall Flume into the Influent pump
station. Influent is then pumped to Anaerobic basin in Oxidation ditch then goes to the
anoxic basin in the Oxidation ditch continues to BNR part of the Oxidation ditch. The
waste water then goes over the Weir into the final Clarifier box. Mixed liquor is then
returned to Anaerobic basin or to the Sludge thickener. Clarifier water flows to the four
Tertiary sand filter then goes to the Post Air where is it Aerated then it flows to the UV
Disinfection then is discharged in the creek. Thicken Sludge goes to the Aerobic digestor
and then hauled off by Granville Farms.

Sludge Management Plan
We have two aerobic digesters, a drum thickener, we use polymer to dewater sludge. We
also process 35-45 thousand gallons of mixed liquor per day. Digested sludge is hauled
from the facility by Granville Farms who holds a land application permit. (Permit number
WQ0000838) The onsite Lab forms testing to facilitate wasting rates.

Chemical Addendum
The City Of Henderson Water Reclamation doesn't anticipate any emerging contaminants (1.4-D or PFAS)
to be present in the wastewater.

A 13 C D E F I G I H I J K L M N O 1 P
NPDES/PT POC Review Form Version: 2022.06.22
2
1. Facility's General Information
3
Data of (draft) Review
9/12/2023
c. POC review due to:
e. Contact Information
4
Data of (final) Review
Municipal NPDES renewal
❑
Regional Office (RO) Raleigh
5
NPDES Permit Writer (pw)
Gary Perlmutter
HWA-AT/LTMP Review
ElRO
PT Staff Chang Zhang RO NPDES Staff Vanessa Manuel
6
Permitlee-Facility Name
Town of Henderson - Henderson WRF
New Industries
❑
Facility PT Staff, email Darrel Johnson, di ohnson(dci.henderson.nc.us
7
NPDES Permit Numher
NC0020559
WWTP-ansion
❑
f. Receiving Stream
8
NPDES Permit Effecfwe Date
Stream reclasedadjustment
❑
Qutfall
9
Chemical Addendum Submittal Data
Omfell relmationladjustmeat
❑
Receiving Stream:
Nutbush Cr
CA, cfs:
3.5
10
NPDES Permit Public Notice Dete
7Q10 update
❑
Stream Class
C
7Q10 (a), cfs:
0.2
11
eDMR data evaluated from:
10
Other POC review trigger, explain:
Oufall Lat.
36.21.01
Oui Long.
-78.24.40
12
3
a. W WTP Capacity Summary
0utfall 11
Current Permitted Flow, mgd
4.1 Dee '' signed Fes4.1
Receiving Stream:
OA, cfs:
14
Permitted SIU Flaw, mgd
0.08
d. IU Summary
Stream Class
7Q10. cfs:
RP
15
b. PT Docs. Summary
# IUs
1
Oufall Let.
Ouffall Leng.
16
IWS approval date
6/1412017
#SIUs
1
Is there a PWS downstream of the Facility's Outfalls? ❑ YES ❑ NO
17
.0 USTMP approval date:
2/14/2020
#CIUs
0
Comments:
18
19
.E
d HWA approval data
m
0
6/15/2017
If NSCIUs
0
If w/Local
Permits or Other
Tyfies
0
20
Z 2. Industrial Users' Information.
21
#
Industrial User (IU) Name
IU Activity
IU Non Conventional Pollutans & Toxic Pollutant
IUP Effective Date
22
1
Mars Pet Care
oet food
BOD, TSS Temperature, pH COD, Cu, 0&G, Total Phosphorus, TKN, Zn
4/3/2022
23
2
24
s
25
4
26
s
31
comment:
32
3. Status of Pretreatment Program (check all that apply)
33
Status of Pretreatment Pro ram check all that appl
34
❑
1) facility has no SIUs, does have Division approved Pretreatment Program that is INACTIVE
35
❑
2) facility has no SIUs, does not have Division approved Pretreatment Program
36
❑
3) facility has SIUs and DWQ approved Pretreatment Program
37
❑
3a) Full Program with LTMP
3g
❑
31b) Modified Program with STMP
39
❑
4) additional conditions regarding Pretreatment
attached
or listed
below
40
2
5) facility's sludge is being land applied or composted
41
❑
6) facility's sludge is incinerated (add Beryllium and Mercury sampling according
to § 503,43)
42
43
❑
❑
7) facility's sludge is taken to a landfill, if yes wlandfill:
hich
8) other
44
45
46
Sludge DisposalAN.-
47
Sludge Permit
Page 1 20559 POC Review Form

A 6 I C D I E F G H I J K I L I M N O P
48
4. LTMP/STMP and HWA Review
49
PW: Find L/STMP document, HWA spreadsheet, DMR, previous and new NPDES permit for next section.
50
5,
a
�Comment
N�
U
n
Parameter of Concern
POC Check List
New
NPDES
POC
Previous
NPDES
POC
Required by
EPA PT 1
POC due to
Sludge 2
POC due to
SIU 3
POTW
POC 4
L/STMP
Effluent Freq
NPDES
Effluent Freq
PQLs review
%
Removal
Rate
PQL from
L/STMP, ug/I
Required PQL
per NPDES
permit
Recomm.
PQL, ug/I
52
❑'
Flow
❑'
❑'
❑'
❑
I Quarterly
53
❑
BOD
Li
❑
❑+
❑
Quarterly
2 mg/L
54
❑'
TSS
Quarterly
2.5 mg/L
55
❑
NH3
0
❑
❑
❑
Quarterly
0.1 mg/I
56
❑'
Arsenic
❑
❑
0
❑'
❑
Quarterly
10.0
2.0
Reduce to recommended PQL
57
❑
Barium
❑
❑
❑
❑
❑
58
❑
Beryllium(5)
❑
❑
❑
❑
❑
59
0
Cadmiumi
❑
❑
0
❑'
❑
❑
Quarterly
2.0
0.5
Reduce torecommended PQL
60
❑
Chromium(1)
❑
❑
0
❑
❑
❑
I
Quarterly
5 o
10.0
61
0
copper(1)
❑
❑
El
p
❑
❑
Quarterly
2.0
2.0
62
❑
Cyanide
❑
❑
❑
❑
❑
63
❑'
Lead(1)
❑
❑
❑
0
❑
❑
Quarterly
10.0
2.0
Reduce torecommended PQL
64
❑'
Mercury(5)
❑
❑
❑'
❑
❑
Quarterly
o.00l
0.001
65
0
Molybdenum
❑
❑
❑+
❑i
❑
Quarterly
100.0
10.0
Reduce torecommended PQL
66
❑
Nickel(l)
❑
❑
0
❑+
❑
❑
Quarterly
10.0
So
Reduce to recommended PQL
67
❑
Selenium
❑
❑
❑'
❑
❑
Quarterly
10.0
68
❑'
Silver
❑
❑
❑'
❑
❑
Quarterly
5.0
1.0
Reduce to recommended PQL
69
0
Ziri
❑
❑
❑
0
❑+
❑
Quarterly
10.0
10.0
70
❑
Sludge Flow to Disposal
E
❑
❑
Quarterly
71
0
% Solids to Disposal
❑
❑
❑
Quarterly
72
❑'
Oil S Grease
0
❑
Quarterly
5 ni
73
❑
TKN
❑
0
❑
Quarterly
1 mg/L
74
❑
TP
❑
Q
❑
Quarterly
0.2 mg/L
75
❑
❑
❑
❑
❑
76
❑
❑
❑
❑
❑
77
❑
❑
❑
❑
❑
78
79
80
81
12
Footnotes:
83
(1) Always in the LTMP/STMP due to
EPA -PT requirement
84
(2) Only in LTMP/STMP if listed in sludge permit
85
(3) Only in LTMP/STMP while SIU still discharges to POTW
86
(4) Only in LTMP/STMP when pollutant is still of concern to POTW
87
(5) In LTMP/STMP, R sewage sludge is incinerated
88
Please use blue foal, for the info updated by pw
89
Please use red font for POC that need to be addedlmodi ied In L/STMP
sampling
plan
90
Please use orange font and air Isethrough for POC that may be 11samp!
ing plan
giI
Blue shaded cell (D60:1182): Parameters usually included under that POC list
92
93
Facility Summary/background information/NPDES-PT regulatory action:
POC to be added/modified In USTMP:
94
95
gg
97
ORC's comments on IU/POC:
POC submitted through Chemical
Addendum or Supplemental Chemical
Datashest:
Additional pollutants added to USTMP due
to POTWs concerns:
NPDES pw's comments on IU/POC.
g8
6. Pretreatment updates in response
to NPDES permit renewal
gg
1 NPDES Permit Effective Data 180 days after effective (date): I Permit writer, please add list of required/recommended PT updates in NPDES permit cover letter.
Page 2 20559 POC Review Form

NORTH CAROLINA 2022 303(D) LIST
Middle Roanoke Roanoke River Basin
AU Name
AU ID Description
Roanoke River Basin
AU Number Classification
03010102
AU_LengthArea AU —Units
Middle Roanoke
Island Creek (Island Creek Reservoir) 23-4 C 6.4 FW Miles
6945 From source to North Carolina -Virginia State Line, including that portion of Island Creek Reservoir in
North Carolina below normal operating elevation
PARAMETER IR CATEGORY CRITERIA STATUS REASON FOR RATING 303D YEAR
Benthos (Nar, AL, FW) 5 Exceeding Criteria Fair, Poor or Severe Bioclassification 2022
Nutbush Creek (Including Nutbush Creek Arm of John 23-8-(1)a
H. Kerr Reservoir below normal pool elevation)
7006 From source to NC 39
PARAMETER IR CATEGORY CRITERIA STATUS
Benthos (Nar, AL, FW) 5 Exceeding Criteria
C 1.7 FW Miles
REASON FOR RATING 303D YEAR
Fair, Poor or Severe Bioclassification 1998
Nutbush Creek (Including Nutbush Creek Arm of John 23-8-(1)b
C 1.6 FW Miles
H. Kerr Reservoir below normal pool elevation)
7007 From NC 39 to SR 1317
PARAMETER IR CATEGORY CRITERIA STATUS
REASON FOR RATING 303D YEAR
Fish Community (Nar, AL, FW) 5 Exceeding Criteria
Fair, Poor or Severe Bioclassification 1998
Roanoke River Basin
03010103 Upper Dan
DAN RIVER (North Carolina portion) 22-(1)b
C;Tr 11.6 FW Miles
6481 From Little Dan River to Peters Creek
PARAMETER IR CATEGORY CRITERIA STATUS
REASON FOR RATING 303D YEAR
Turbidity (10 NTU, AL, Tr) 5 Exceeding Criteria
2018
Belews Creek (including Belews Lake below elevation 22-27-(7) C 789.7 FW Acres
725) (1)
6627 From Southern Railroad Bridge to to a point 1.8 mile downstream of Forsyth -Stokes County Line
PARAMETER IR CATEGORY CRITERIA STATUS REASON FOR RATING 303D YEAR
Water Temperature (322C, AL, LP&CP) 5 Exceeding Criteria 2014
Smith River 22-40-(1) WS-IV 2.8 FW Miles
6693 From North Carolina -Virginia State Line to a point 0.8 mile downstream of Rockingham County SR 1714
(Aiken Road)
PARAMETER IR CATEGORY CRITERIA STATUS
Benthos (Nar, AL, FW) 5 Exceeding Criteria
REASON FOR RATING 303D YEAR
Fair, Poor or Severe Bioclassification 2008
6/7/2022 NC 2022 303d List- Approved by EPA 4/30/2022 Page 103 of 192

NORTH CAROLINA 2022 INTEGRATED REPORT
Middle Roanoke Roanoke River Basin
AU Name AU Number
AU ID Description
Nutbush Creek (Including Nutbush Creek Arm of John 23-8-(1)b C
H. Kerr Reservoir below normal pool elevation)
7007 From NC 39 to SR 1317
2022 Water Quality Assessments
PARAMETER
Water Temperature (322C, AL, LP&CP)
Dissolved Oxygen (4 mg/I, AL, FW)
pH (6 su, AL, FW)
pH (9.0, AL, FW)
Chloride (230 mg/I, AL, FW)
Flouride (1.8 mg/I, AL, FW)
Turbidity (50 NTU, AL, FW miles)
Fish Community (Nar, AL, FW)
Benthos (Nar, AL, FW)
Fecal Coliform (GM 200/400, REC, FW)
Nutbush Creek (Including Nutbush Creek Arm of John 23-8-(1)c
H. Kerr Reservoir below normal pool elevation)
7008 From SR 1317 to Nutbush Creek Arm of Kerr Reservoir
2022 Water Quality Assessments
PARAMETER
Fish Community (Nar, AL, FW)
Classification AU LengthArea AU Units
1.6 FW Miles
IR CATEGORY CRITERIA STATUS
1 Meeting Criteria
1 Meeting Criteria
1 Meeting Criteria
1 Meeting Criteria
1 Meeting Criteria
1 Meeting Criteria
1 Meeting Criteria
5 Exceeding Criteria
1 Meeting Criteria
3a Data Inconclusive
104.4 FW Acres
IR CATEGORY CRITERIA STATUS
1 Meeting Criteria
6/7/2022 NC 2022 INTEGRATED REPORT -Category 5 Approved by EPA 4/30/2022 Page 848 of 1346

FISH COMMUNITY SAMPLE
Waterbody
Location
Station ID
Date
Bioclassification
NUTBUSH CR
SR 1317
NF28
05/28/19
Fair
County
8 digit HUC
Latitude
Longitude
Elevation (ft)
Reference Site
VANCE
03010102
36.369048
-78.408169
320
No
Level IV Ecoregion
Drainage Area (mi2)
Stream Width (m)
Stream Depth (m)
Northern Outer Piedmont
6.1
7
0.3
Upstream NPDES Dischargers (>_ 1 MGD or < 1 MGD and within 1 mile)
NPDES Number
Volume (MGD)
Henderson WRF (Water Reclamation Facility)
NCO020559
4.1
Landuse (%)
Forest
Developed
Impervious
Cultivation
Grass/Herb/Shrub
Wetland
Water
Barren
1992
45.2
45.1
no data
7.0
no data
1.2
0.1
1.4
2001
33.8
53.9
15.1
5.7
4.6
1.1
0.1
0.0
2006
33.7
54.2
15.2
5.7
5.2
1.1
0.1
0.0
2011
34.6
52.9
15.8
5.9
5.4
1.1
0.1
0.0
Water Quality Parameters
2004
2014
2019
Temperature (°C)
14.6
21.8
22.7
Dissolved Oxygen (mg/L)
10.6
7.1
7.7
Specific Conductance (pS/cm)
467
511
294
pH (s.u.)
7.4
7.4
7.5
Habitat Assessment Scores (max score)
2019
Channel Modification (5)
5
Instream Habitat (20)
12
Bottom Substrate (15)
3
Pool Variety (10)
4
Riffle Habitat (16)
7
Bank Erosion (7)
6
Bank Vegetation (7)
7
Light Penetration (10)
6
Left Riparian Score (5)
5
Right Riparian Score (5)
5
Total Habitat Score (100)
60
Water Clarity IClear. Substrates Isand, gravel, bedrock, and silt.
Sample Date
Sample ID
Species Total
NCIBI Score
NCIBI Rating
05/28/19
2019-36
12
38
Fair
06/11 /14
2014-43
12
42
Good -Fair
04/29/04
2004-28
13
38
Fair
10/04/94
94-42
12
44
Good -Fair
Data
Watershed - a northern flowing tributary to Kerr Reservoir, draining central Vance County. This site is about 1.3 miles downstream from the Henderson WRF,
and 1.4 miles upstream from the creek's confluence with the lake. Habitats - wide forested riparian zones here are providing moderate canopy shading.
Instream habitats are primarily shallow, embedded, sandy/silty runs with overhanging shrubs along the edges. Abundant bedrock veins are present in the
downstream part of the reach near the road crossing. There have been no obvious habitat changes at this site since the 2014 survey. 2019 Fish Community -
the creek became very turbid with silts during sampling. Lower fish diversity here as seen in past assessments, with the same number of species present as in
2014. A slight trophic shift between insectivores and omnivores+herbivores (including dominance of the omnivorous Spottail Shiner) is the reason for the 4
point decline in NCIBI score and rating. However, these slight declines do not reflect any big changes to the fish community. Two species of fish were
observed with young -of -year cohorts in 2019 - Bluegill (n=1), and Bluehead Chub (schools observed but not collected). 1994-2019 - consistently high
conductivities have been measured at this site due to the Henderson WRP, and also from Henderson's non -point runoff. Although still quite elevated, 2019
marked the lowest conductivity measured here to date. Nutbush Creek continues to support lower fish species richness, with a total of 16 known species
collected from this site including no suckers, 4 sunfish and bass (3 collected in 2019), 8 minnows (6 collected in 2019), 2 catfish (both collected in 2019), and 2
darters (1 collected in 2019). Although the rating here dropped back down to Fair in 2019, the fish assemblage does not appear to have changed much in this
urban watershed since the 2014 survey.
Most Abundant Sp. ISpottail Shiner (n=73, 28%). Non -Native Sp. I Green Sunfish (n=19), Bluegill (n=39).
Species Change Since Last Cycle
Species gained since 2014 - Creek Chub (n=1, last collected here in 2004), and Yellow Bullhead (n=1, new record). Species lost since 2014 - Rosyside
Dace (1 collected in 2014), and Comely Shiner (7 collected in 2014).

Henderson WRF - Permit NCO020559
Shepherd, Forest T
Mon 9/18/2023 5:16 PM
To:Perlmutter, Gary <[e-mail]>
Cc:Deamer, Nora <[e-mail]>
9 attachments 0 MB)
NCO020559_32230 - Chlorophyll A_Downstream_001.png; NCO020559_32230 - Chlorophyll A_ Downstream_001A.png; NCO020559_CO610 - Nitrogen, Ammonia Total (as N) -
Concentration_Effluent_001.png; NCO020559_34611 - 2,4-dinitrotoluene_Effluent_001.png; NC0020559_01092 - Zinc, Total (as Zn)_Influent_001.png; NCO020559_01092 - Zinc,
Total (as Zn)_Effluent_001.png; NCO020559_00630 - Nitrite plus Nitrate Total (as N)_Downstream_001.png; NCO020559_00630 - Nitrite plus Nitrate Total (as
N)_Downstream_001A.png; NCO020559_00630 - Nitrite plus Nitrate Total (as N)_Effluent_001.png;
Basin planning pulled the influent, effluent, and instream monitoring data provided by the Henderson WRF (NC0020559). Based on the 2015 — 2023 data, the
chlorophyll a numbers recorded at both the downstream monitoring stations are concerning (see attached). In reviewing the nutrients (nitrate+nitrite, total
nitrogen, total Kjeldahl nitrogen, and total phosphorus) they appear to be following their current limits (only ammonia attached). Two other notable
parameters were 2,4-dinitrotoluene and zinc (see attached). Notably, this facility is discharging into a stream with low streamflow volumes (winter 7Q10 0.4
cfs; summer 7Q10 0.2 cfs; average 3.5 cfs) and their IWC (%) is 97% at 4.14 MGD and 98% at 6 MGD.
While reviewing their nitrate+nitrite data we are concerned about the concentrations the facility is reporting. The Division has an ambient monitoring system
(AMS) station (N5000000) located between the D1 and D2 monitoring stations established by the facility. There is considerable difference in the nitrate+nitrite
concentrations recorded at the D1 station compared to our AMS station N5000000. The stations are approximately 0.87 miles apart and there are no
significant sources of nutrients in the drainage area between D1 and N5000000. We suggest adding a split sampling effort because the nitrate+nitrite
concentrations recorded at their downstream station D1 are very low compared to the AMS station (N5000000) between the facilities stations D1 and D2. We
defer to your judgement call on how many split samples to collect.
The chlorophyll a numbers recorded at the downstream monitoring stations (D1 and D2) and the ambient lakes monitoring program station ROA037A (see
below) run by DWR's Intensive Survey Branch (which is co -located with the permittee's most downstream monitoring stations) suggest that the available
nutrients in Nutbush Creek and draining to John H. Kerr Reservoir are having an impact on water quality. Values can be above the chlorophyll a water quality
standard and can be the highest recorded lake station across John H. Kerr Reservoir. The chlorophyll a concentrations in Nutbush Creek (station D1) are
extremely concerning with a large number of records above 40 µg/L. This is a small stream where a large percentage of the flow is likely wastewater discharge
during low flow periods. The chlorophyll a levels indicate that it is a highly productive stream. It is not surprising that there are impacted biology communities.
I would also assume that there is a lot of periphytic growth that likely occurs in this stream. The creek likely backs up or there is a slow flow allowing for the
algae to grow in this system.
Nutrient levels in the effluent of the Henderson WRF (NC0020559) are contributing to the cumulative impact to Nutbush Creek and John H. Kerr Reservoir.
There is a concern for the levels of chlorophyll a recorded in Nutbush Creek and a concern that if nutrients increase to this arm of John H. Kerr Reservoir, we
could have an impaired waterway in the future. We request year-round monthly monitoring for upstream nutrients (NO2+NO3, NH3-N, TKN, and Total
Phosphorus) using a grab sample and downstream nutrients (NO2+NO3, NH3-N, TKN, and Total Phosphorus), secchi, and chlorophyll a using a composite
sample in the lake and a grab sample in the creek. The reason for this additional monitoring is the concerning chlorophyll a levels and the need to begin
capturing an entire year -long understanding of the nutrients in Nutbush Creek to monitor the nutrient levels responsible for the elevated chlorophyll a from
the areas draining to the Henderson WRF outfall and downstream from their return flows.
The last two comments we would like to share are that the composite sample the facility is collecting for nutrients, secchi, and chlorophyll a at station D1
should be a grab sample since the stream in that section of the Nutbush Creek is most likely shallow given the volume and the width of the stream channel. It
seems quite difficult to sample at twice the secchi depth. Also, as we discussed previously, the AMS station N5000000 should have chlorophyll a added as a
water quality parameter that is sampled monthly. Basin planners discussed possibly a year-round special study in 2024. Would you be willing to request this
parameter be added to the water quality parameters sampled at AMS station N5000000 to align with what the permittee has to sample and to help determine
Nutbush Creek's compliance with the water quality standards?
Roanoke River Basin Data, DWR Intensive Survey Branch: https!Lwww.deq.nc.gov/water- g_a ritybims reports/roanoke19finaI/download

SURFACE PHYSICAL DATA
PHOTIC ZONE DATA
Total
Ternp Dep[h Percent
Total
Suspendad
Total
Lake
Date Sampling DO Water pH Cond. Secchi DO
TP TKN NH3 NO. TN TON TIN Chia Solids
Solids
Turbidity
He'dnes
Station IL C s.u. mh-lom meters SAT
m !L m 1L !L m !L m IL m !L m 1L IL m iL
m IL
NT IJ
rrgL
HUC 03010102
J HN H. KERR
September 18, 2019
RCA037A
7.6
27.8
7.2
92
1 .0
97.3%
0.03
0.45
10.02
10.02
0.46
0.44
0.02
19.0
73
112.0
5.4
RESERVOIR
September 18, 2019
RCA037D
7.8
27.4
7.2
86
2CI
983%
002
0.32
<0.02
<0.02
0.33
0.31
0.02
11.0
59
<6.2
2.8
25.0
September 18. 2019
ROA037E
7.3
27.4
7.2
90
2.0
93.0%
0.02
0.31
0.02
r0.02
032
0.30
0.02
10.0
74
<6.2
3.3
September 18, 2019
ROA0371
66
26.6
7.2
96
28
82 9%
002
027
003
<0 02
028
024
004
58
60
<fi 2
18
Se tember 18. 2019
ROA0371J
6.0
26.8
7.6
101
2.5
75.3%
0.02
0.28
0.03
<0.02
0.29
0.25
0.04
4.6
80
<6.2
1.5
Augusl28, 2019
RCAU37A
79
2111
7.5
93
1 5
1030%
0 02
0 33
<0.02
<0 02
0.34
0.32
0 02
7 T
84
<6 2
3.1
Augusl28, 2019
RCA037B
7.5
28.6
7.6
88
1.5
982%
0.02
0.31
<0.02
10.02
0.32
0.30
0.02
11.0
100
112.0
2.3
27.0
Augusl28, 2019
RCA037E
7.4
27.8
7.4
93
2CI
95.5%
<0.02
0.3C
<0.02
<O.C2
031
0.29
0.02
10.0
74
:6.2
2.1
Augusl28, 2019
ROA0371
6.9
27.8
7.2
95
2.5
80-3%
<0.02
0.30
al
<0.02
031
0.28
0.63
5.3
84
�62
1.8
Au us128, 2019
ROA037IJ
6.8
27.7
7.4
102
2.5
87.4%
<0.02
0.33
0.02
<0.02
0.34
0.32
0.02
6.3
68
�6.2
1.6
July 18, 2019
RCA037A
7.4
30.8
7.6
102
1 .3
99.6%
19.❑
H1.0
:6.2
4.1
July 18, 2019
RCA037B
7.8
31.5
7.3
91
2CI
107.29E
100
66
�6.2
2.9
28.0
Juy 10, 2019
RCA037E
6.8
30.1
7.2
97
20
91.0%
120
73
�12
3.8
July 18. 2019
ROA0371
7.3
30.7
7.4
96
2.5
99.0%
8.1
74
<120
2.3
July18. 2019
ROA0371J
7.fi
30.9
7.7
76
2.5
102.8%
8.2
65
�6.2
2.0
June 2fi. 2019
ROA037A
9.2
27.9
8.3
92
0.9
117.1%
0.02
<0.02
<0.02
0.02
170
t6.2
3.7
June 26, 2019
ROA0376
8.B
27.5
7.7
93
1 .4
1092%
<0.02
<0.02
<0.02
0.02
3.6
69
•�6.2
2.7
30.0
June 26, 2019
RCA037E
8.7
27.5
7.9
96
1 .6
110.0%
<0.02
<0.02
110
8C
•=6.2
2.1
June 26, 2019
ROA0371
8.4
26.5
8.0
96
1.6
109.0%
10.02
<0.02
<0.02
0.02
7.5
72
12.0
1.8
June 26. 2019
ROA0371J
May 21, 2019
RCA037A
9.2
24.1
8.3
9B
12
110.7 %
002
0.41
<0.02
007
0.48
0.40
0.08
13.0
75
1120
33
May 21, 2019
RCA037B
94
24 7
8 5
92
2.1
1 142 %
002
039
c0.02
0 OS
0 47
❑ 38
0013
11 0
74
a62
2 8
300
May 21, 2019
RCA037E
8.9
23.1
8.0
92
1.5
104.9%
<0.02
0.27
<0.02
0.10
037
0.26
0.11
8.9
65
<B2
32
May 21, 2019
ROA0371
9.0
243
8.2
92
1.8
109.3%
<0.02
0.28
<002
0.08
036
0.27
0.09
a.7
8o
<B2
2.7
Ma 21, 2019
ROA0371J
9.1
25.4
8.4
94
2.0
111.2%
<0.02
0.32
<002
0.07,
039
0.31
0.08
9.4
72
<62
2.9
Thank you for giving us an opportunity to review the data associated with the Henderson WRF - Permit NCO020559
Until Next Time,
Forest Shepherd (he/him)
Environmental Program Consultant Division of Water Resources
North Carolina Department of Environmental Quality
Office: [phone]
Forest.Shepherd deq.nc.gov <- (Please note new email address)
Email correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third parties by an authorized state official.

MONITORING REPORT(MR) VIOLATIONS for:
Permit: NCO020559 MRS Betweel 8 - 2018 and 9 - 2023 Region: %
Facility Name: % Param Nam(% County: %
Major Minor: %
Report Date: 09/18/22 Page 1 of 1
Violation Category:Limit Violation Program Category: NPDES WW
Subbasin: % Violation Action:
PERMIT: NCO020559 FACILITY: City of Henderson - Henderson Water Reclamation COUNTY: Vance REGION: Raleigh
Facility
Limit Violation
MONITORING VIOLATION UNIT OF CALCULATED %
REPORT OUTFALL LOCATION PARAMETER DATE FREQUENCY MEASURE LIMIT VALUE Over VIOLATION TYPE VIOLATION ACTION
03 - 2019
001
Effluent
BOD, 5-Day (20 Deg. C) -
03/23/19
5 X week
mg/I
18
18.58
3.2
Weekly Average
Concentration
Exceeded
05 - 2021
001
Effluent
BOD, 5-Day (20 Deg. C) -
05/31/21
5 X week
mg/I
6
6.23
3.8
Monthly Average
Concentration
Exceeded
06 - 2021
001
Effluent
BOD, 5-Day (20 Deg. C) -
06/12/21
5 X week
mg/I
9
9.66
7.3
Weekly Average
Concentration
Exceeded
06 - 2021
001
Effluent
BOD, 5-Day (20 Deg. C) -
06/30/21
5 X week
mg/I
6
7.2
20.1
Monthly Average
Concentration
Exceeded
09-2020
001
Effluent
Chlorine, Total Residual
09/29/20
5 X week
ug/I
17
19.8
16.5
Daily Maximum
Exceeded
05 - 2022
001
Effluent
Nitrogen, Ammonia Total (as
05/28/22
5 X week
mg/I
9
15.32
70.2
Weekly Average
N) - Concentration
Exceeded
05 - 2022
001
Effluent
Nitrogen, Ammonia Total (as
05/31 /22
5 X week
mg/I
3
4.68
56.0
Monthly Average
N) - Concentration
Exceeded
01 -2019
001
Effluent
pH
01/28/19
5 X week
su
6
5.3
11.7
Daily Minimum Not
Reached
03 - 2019
001
Effluent
Solids, Total Suspended -
03/23/19
5 X week
mg/I
45
56.2
24.9
Weekly Average
Concentration
Exceeded
Proceed to
Enforcement Case
Proceed to NOD
Proceed to
Enforcement Case
Proceed to
Enforcement Case
No Action, BPJ
Proceed to
Enforcement Case
Proceed to
Enforcement Case
No Action, BPJ
Proceed to
Enforcement Case

10/2/23, 9:41 AM
Detailed Facility Report I ECHO I US EPA
Detailed Facility Report
ECHQ,ll,,,
Detailed Facility Report
Facility Summary
HENDERSON NUTBUSH CREEK WWTP
1646 WEST ANDREWS AVENUE, HENDERSON, NC 27536
FRS„(Faci,litg,Regis[„ry„Service) ID: 110002357930
EPA Region: 04
Latitude: 36.349349
Longitude:-78.411438
Locational Data Source: FRS
Industries: --
Indian Country: N
Enforcement and Compliance Summary
Statute
Compliance Monitoring Activities (5 years)
Date of — Compliance Monitoring Activity
Compliance status
Otn in Noncompliance 1& 12)
Otn with Sign'dicant vi.Wion
Informal Enforcement Acions IS years)
Formal Enforcement ANons (5 years)
Penalties from Formal Er fon, m . Actions (5 years)
EPA Us (5 years)
Penalties from EPA Cases is years)
Regulatory Information
Clean Air Act( CAA): No Information
Clean Water Act (CWA): Non -Major, Permit Effective (NCL020559), Major, Permit Expired (NCO020559), Non -Major,
Permit Effective (NCG110075)
Resource Conservation and Recovery Act (RCRA): No Information
Safe Drinking Water Act(SDWA): No Information
Go To Enforcement/Co F'Iiance Details
Known Data Problems
Facility/System Characteristics
Facility/System Characteristics
7
06/07/2023
Violation Identified
12
0
4
$5,971
Other Regulatory Reports
Air Emissions Inventory (EIS): No Information
Greenhouse Gas Emissions (eGGRT): No Information
Toxic Releases (TRU: No Information
Compliance and Emissions Data Reporting Interface (CEDRI): No Information
sysmm Nrtun
Idemiaer J —�Areu Permit Expiration Date _ Indian Country
Latitude Longitude
FRS
110002357930
N
36,349349-78,411438
IOS-NPDES CWA
NCL020559 Non -Major: Associated Permit Record
ERettive Biosolids 12/31/2025 N
36.349349-78,411438
ICIS-NPDES CWA
NCO020559 Major: NPDES ndlvidual Permit
Expired Biosolids, POTW Pretreatment 03/31/2023 N
36.348645-78.412073
IOS-NPDES CWA
NCG110075 N.nM jor: General Permit Covered Facility
ERettive OS/31/2028 N
36.3497-78.7119
Facility Address
System statue¢
Facility Name
i FacilityAddress
, Facility County
FRS
110002357930 HENDERSONNUTBUSH CREEK 1
1646 WEST ANDREWS AVENUE, HENDERSON, NC 27536
Vance County
ICIS-NPDES CWA
NCL020559 CITY OF'ENDERSON
PO BOX 1434, HENDERSON, NO 27536-1434
Vance Counry
ICIS-NPDES CWA
NCO020559 HENDERSON WATER RECLAMATION FACTITV
1646 WANDREWS AVE, HENDERSON, NC275362555
Vance County
ICIS-NPDES CWA
NC3110075 NUTBUSH CREEKWWTP
1646 WANDREWS AVE, HENDERSON, NO 27536
Vance Count'
Facility SIC_(Standard Industrial
Classification) Codes
Facility NAICS (North,Amencan Industry Classification System) Codes
system
Identifier SIC Code SIC Description
. Idemifier NAICS Code
NAICS Description
ICIS NPDES
NCO020559 4952 Sewerage Syttems
No data records returned
Facility Industrial Effluent Guidelines
Facility Tribe Information
Identifier
UN— Guideline(40 CFR Part) ■ Effluent Guideline Description
Reservation Name Tribe Name
Dirtanceto Tdbe(miles)
NCO020559
401 General provisions
NCG 110075
401 General prow:ions
No data records returned
Enforcement and Compliance
Compliance Monitoring HistoryLast 5ye
Statute Source ID sy— Activity Type Compliance Monitoring Type Lead Agenry Data nnding(if applicable)
CWA NCO020559 ICIS-NPDES Inspection/Evaluation Base Program -Evaluation State 06/07/2023
CWA NCO020559 US-NPDES Inspection/Evaluation Base Program- Evaluation State 08/24/2021
CWA NCO020559 ICIS-NPDES Inspecion/Evaluation Base Program -Evaluation State 07/22/2021
CWA NCO020559 ICIS-NPDES Inspettion/Evaluation Base Program- Biomonimring State 07/14/2020
CWA NCO020559 ICIS-NPDES Inspecion/Evaluation Base Program -Evaluation State 07/17/2019
CWA NCO020559 ICIS-NPDES Inspettion/Evaluation Base Program -Evaluation State 01/31/2019
CWA NCL020559 ICIS-NPDES OReite Record Review Biosolids-Desk Audit EPA 12/31/2022
Entries in italics are not counted as EPA official inspections.
Compliance Summary Data
Statute source ID C $N415fgRifi N mglie )/H,PV(Hgh_R!onty Yolat on) Current A9 OF Qlrs with NC(N comp) ance)(of 12) Data La#Refreshed
CWA NCL020559 No 06/30/2023 0 09/29/2023
CWA NCO020559 No 06/30/2023 112 09/29/2023
https://echo.epa.gov/detailed-facility-report?fid=l 10002357930&ej_type=sup&ej_compare=US 1 /3

10/2/23, 9:41 AM
Detailed Facility Report I ECHO I US EPA
Statute 5— ID
C rent SNC(Sgnifi t Noncomplencel/HPV
(High P riy Violation)
Current Asof
Qtrs w th NC(Noncomphance) RA 12)
Data Last Refreshed
CWA NCG 110075
No
06/30/2023
0
09/29/2023
Three Year Compliance History by Quarter
Statute Pmgram/PollutanuYolation Type
QTR 1
QTR 2 QTR 3
QTR 4
QTR S QTR 6
QTR J
QTR 8 QTR 9
QTR 10
QTR 11
QTR 12 QTR 13+
EWA(S--ID: NCL020559)
07/01 09/30/20
10/01-12/31/20 01/01-03/31/21
04/01-06/30121
07/01-09/30/21 10/01-12/31/21
01/01-03/31/22
04/01-06/30/22 07101-09/30/22
10/01-12/31/22
01101-03/31/23
04/01-06/30/23 0]/01
09/29/23
Facility -Level Status
NO Violation
NO Vlolation NO Violation
NO Violallon
NO Violation NO Vlolation
NO Violation
NO Violation NO Viola<ion
NO Vlolation
NO Uolation
NO Violation Undetermined
Ider�----
QuarteHy Noncompliance Report Hiztory
CWA ($oumelD: N00020559)
07/01-01/30/20
10/01-12/31/20 01/01-03/31/21
04/01-06/30121
07/01-09/30/21 10/01-12131121
01101-03/31/22
04/01-06/30/22 07/01-09130/22
10/01-12/31/22
01/01-03/31/23
04/01-06/30/23 0]/O1-
09/29/23
Facility -Level Status
Violation Identified
Volition Identified Violationldentified Violationldentified
Violation Identified Volation Identified
Violationldentified
Violationldentified Violationldentified
Volition Identified
Viol— ldendfed
Violationldentified Undetermined
Report History
Reportable
Reportable Reportable
Reportable
Reportable Reportable
Reportable
Reportable Reportable
Reportable
Reportable
Reportable
4-,I*I,N0ncompliance
Noncompliance
Noncompliance Noncompliance
Noncompliance
Noncompliance Noncompliance
Noncompliance
Noncompliance Noncompliance
Noncompliance
Noncompliance
Noncompliance
Po11— Disch Mon Loc Freq
Point
BOD. S-dav 20
a CWA
deg.0
001- Effluenx Mthly
4%
M Gross
001- Effluent NMth
M Gross
]%
.CWA
BOO. S-day.20
deg C
.CWA
Nit--
001- EfFl t Mthly
M Gross
56%
fi lm
E CWA ias NJ 001- I Eff—rt NMth
70%
M Gross
Late or Missing Discharge Monitoring
Report (DMR) Measurements
Counts of tale DMR Measurements
1
Counts of Missing DMR Measumments 3
11 3
3
3 3 3
3 3
3
3 3
CWA (S.—ID: NCG110075) 07/01-09/30/20 10/01.12/31/20
01/01.03/31/21
04/01.06/30/21
09/01-09/30/21 10101.12/31121 01/01.03/31/22
04/01.06/30/22 07/01-09/30/22
10/01-12/31/22
01/01.03/31/23 04/01-06/30/23 07/01.
09/29/23
Facility -Level Status ----------
No Vola0on Undetermined
bfied Identified
Qoartedy Noncompliance Report History
Informal Enforcement Actions Last5Years
St— System
Lead Aq—n
CWA ICIS-NPDES
NC0020559
Base Program- Noticeof Yolati—
State
05/12/2023
CWA
ICIS-NPDES
NC0020559
Base Program -Notice of ViolMion
State
01/06/2023
CWA
ICIS-NPDES
NC0020559
Base Program- Noticeof Uolation
State
071110.
CWA
ICIS-NPDES
NC0020559
Base Program -Notice of Violrtion
State
08/23/2021
CWA
ICIS-NPDES
NC0020559
Base Program- Noticeof Yolati—
State
O111312011
CWA
ICIS-NPDES
NC0020559
Base Program -Notice of Volition
State
03/22/2021
CWA ICIS-NPDES
NC0020559
Base Program- Noticeof Yolation
State
05/27/2019
Entries in italics are not counted as informal enforcement actions" in EPA policies pertaining to enforcement response tools.
Formal Enforcement Actions Last5Years
Statute system UWS.di— source ID `Typeof Action
Case N. lead Agenry
Case Name
Issued/�ate Set1.—WARions Settlement/Action Date Federal Penally Assessed State/Local
PenaltyAssessed
Penalty Amount Collected SEPV.1- Comp ARi—Cost
CWA ICIS-NPDE5
OTHER NPDES/NC0020559
Administrative-FormaIl
NC-LV-2022-0303
State
C'ly of Henderson
11/212022
1
11/21/2022
$0
$2,055
- $0 $0
CWA ICIS-NPDE5
OTHER NPDE5/NC0020559
Administrative -Formal
NC-LV-2021-0311
State
Clty of Henderson
11/092021
1
11/09/2021
$0
$1,555
- $0 $0
CWA ICIS-NPDE5
OTHER NPDE5/NC0020559
Administrative -Formal
NCTX-2021-000S State
City of Henderson
06/072021
1
06/07/2021
$0
E2,0]4
- $0 $0
CWA IICIS-NPDE5
OTHER (NPDES/NC0020559
Administative-Formal)NC-LV-2019-Ot]BI
State
CiI of Henderson
0]/302019
1
0]/30/2019
$0
$28]
- $0 $0
Environmental Conditions
Watersheds
12 Dgt WBD.IW h dB ,..,n„dary,DatasetI HUC LRAD
WBD (Wet ,hedB .dory EL &gUSubwatershed Name(RAD S— Water Body Name((41j(I .grated
Beach Closures Within Beach Closures Wthn Lazt
Pollutarrts Potentally Related to Watershed with ESA(E dang,ered5pegesAgR-
.tReafh4PEEeas.D.aAa4ase))
(.Ria$I1.9d?rzaa Data base))
,Cpmplian£a#xh;KMF9P5yA9.T..R
Lart Vear T Years
Impairment listed Aquatic Species?
030101021002
Headwaters Wtbush Creek
NUTBUSH CREEK (I NCLUDING N UTBUSH CREEK
No No
- Ves
ARM OF TO
030201010103
Shelton Creek
-
No No
Assessed Waters From Latest State Submission
(ATTAINS)
State Report eyde Assessment Unit ID
Ave rtUnit Name
Water Condition Cauze Groups Impaired i
Drinking Water Use Ecological Use
Fish Consumption Uze Recreation Uze Other Use
No data records returned
Air Quality Nonattainment Areas
Pollutant Within Nonattainment 5tatu—al
Nonattainment StMus Applicablestandard(s) —1
Within Maintenance 5-uz Area?
Maintenancest—a Applicable standard(s)
No data records returned
Pollutants
Toxics Release Inventory History of Reported Chemicals Released in Pounds per Year at Site
TRI Facility ID Year Total Air Emissions Surface Wafer Discharges off -site Tranderste Po —
No data records returned
Toxics Release Inventory Total Releases and Transfers in Pounds by Chemical and Year
Chemical Name
No data records returned
.GWA.(.C....lea.. n..Wa...ter,Act) Discharge Monitoring Report (DMR) Pollutant Loadings
No data records returned
Community
Underground Injections Releases to Land Total Chsite Releases Total Off -Sint Tranders
DMR and TRI Multi -Year Loading Report
https://echo.epa.gov/detailed-facility-report?fid=110002357930&ej_type=sup&ej_compare=US 2/3

10/2/23, 9:41 AM
Environmental Justice
Detailed Facility Report I ECHO I US EPA
This section shows indexes from EJScreen, EPA's screening tool for environmental justice (EJ) concerns. EPA uses these indexes to identify geographic areas that may warrant further consideration or analysis for potential EJ concerns.
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 R1,dgg.
EJScreen Indexes Shown
Related Reports
EJScreen Community Report
Compare to Q US Q State
Index Type O Environmental Justice O Supplemental
Download Data
census Block Group ID: 371819603002 Us (Percentile)
Supplemental Indexes FacilityCeneus131-k—up 1-mile Max
Count of Indexes At or Above 80th Percentile 1 1
Particulate Matter 2.5 68 68
Ozone 60 60
Diesel Particulate Matter 37 54
Air Toxics Cancer Rsk
0 85
0 85
Air Toxics Respiratory Hazard Index
68
68
Toxic Releases to Air
70
70
Taf,Proximity
68
75
Lead Paint
49
55
Risk Management Plan(RMP) Facility Proximity
64
64
Hazardous Waste Proximity
so
50
Superf,nd Proximity
74
74
Underground Storage TenkS(USr)
75
0 82
Wastewater Discharge
24
24
Demographic Profile of Surrounding Area (1 mile)
O Facility 1-mile Radius ❑ Facility Census Block Group
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 2017 - 2021 American Community Survey (ACS) 5-year Summary and are accurate to the extent that the facility latitude and longitude listed below are
correct. EPNS 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 Statinicz (us. Census)
Total Persons
Population Denziry
=483/,­L
Housing Units in Area
General Statistic(AC$(Mler19@i Commyniry.5untey))
Total Persons
1,264
Percent People of Color
68%
Households in Area
613
Households on Public Assistance
8
Persons With Low Income
542
Percent With Low Income
43%
Gaoglaphy
Radius of Selected Area
Center Latitude
36.349349
Center fnngitude
-78.411438
Land Area
100%
Water Area
0%
InBreakdown(AC,S,(AmeriS.i!a.4gmtBg.Blb..;<.P.rygy))-Households(%)
Less than $15,DDD 108 (1759%)
$15,000-$25,000 72(11.73%)
$25,000-$50,000 256(41.69%)
$50,000 - $75,000 105 (17.1%)
Greater than $75,000 73 (11.89%)
LAST UPDATED ON SEPTEMBER 21, 2022
DATA REFRESH INFORMATION
Age Breakdown(U.S. Census) -Persons(%) ,
Children 5 years and younger 130 (9%)
Minors 17 years and younger 407 (27%)
Adults 18 years and older 1,083 (73%)
Seniors 65 years and older 287 (19%)
Race Breakdown (U.S. Census) -Persons (%)
White
260(17%)
African -American
1, 184(79%)
Hispanic -Origin
26(2%)
Asian/Pacific Islander
12 (1%)
American Indian
1 (0%)
Other/Muhiracial
33 (2%)
Eduoatlon Ie.I(Peraons 25&oI&r)(ACS(A can Communty
Survey))-Penons(%)
Less than 9th Grade
20 (2.23%)
9th through 12th Grade
51 (5,61%)
High School Diploma
307 (34,26%)
Some College/2-year
261 (29.13%)
„B,.S;/,B.,A,J13—„h„e„(o„r,ofSc„ie„n„W,Ba„chelo-,r„o Arfs)or More
164 (18.3%)
https://echo.epa.gov/detailed-facility-report?fid=110002357930&ej_type=sup&ej_compare=US 3/3

Whole Effluent Toxicity Testing and Self Monitoring Summary
Havelock WWTP
NCO021253/001
County:
Craven
Mysd7dPF
Begin:
6/1/2014
Mysid or Cerio Lim@
NonComp: Single
J
F M
A
M
2019
Fail
Pass >60
-
-
2020
Pass
- -
Pass
-
2021
Pass
- -
Pass
-
2022
Pass
- -
Pass
-
2023
Pass
- -
Pass
-
Henderson Nutbush Cr
WWTP
NCO020559/001
County:
Vance
Ceri7dPF
Begin:
8/1/2019
chr lim: 90%
NonComp: Single
J
F M
A
M
2019
Pass
- -
Pass
-
2020
Pass
- -
Pass>100(P)
-
2021
Fail
>100 63.6
Pass
-
2022 Pass >100(P)
- -
Pass
-
2023
Pass
- -
Pass
-
Hendersonville WTP
NCO042277/001
County:
Henderson
Ceri7dPF
Begin:
6/1/2021
Chr Monit: 90%
NonComp:
J
F M
A
M
2019
-
Fail -
-
Fail
2020
-
Pass -
-
Pass
2021
-
Pass -
-
Pass
2022
-
Fail -
-
Pass
2023
-
Pass -
-
Pass
Hendersonville WWTP
NCO025534/001
County:
Henderson
Ceri7dPF
Begin:
1/1/2018
chr lim 18% @ 4.8M
NonComp: Single
J
F M
A
M
2019
-
Pass -
-
Pass
2020
-
Pass -
-
Pass
2021
-
Pass -
-
Pass
2022
-
Pass -
-
Pass
2023
-
Pass -
-
Pass
Hickory WTP (NCG590036)
NCO044121/001
County:
Catawba
Ceri7dPF
Begin:
8/1/2021
ANNUAL (NCG59003
NonComp:
J
F M
A
M
2019
Pass
- -
Pass
-
2020
Pass
- -
Pass
-
2021
Pass
- -
Pass
-
2022
Pass
- -
-
-
2023
Pass
- -
-
-
Region: WARO Basin: NEU10 Jan Apr Jul Oct SOC JOC:
7Q10: 0 PF: 2.25 IWC: 100 Freq: Q
l J A S O N
- Pass - - Pass
- Pass - - Pass
Pass - - Pass
- Pass - - Pass
Pass
Region: RRO Basin: ROA06 Jan AprJulOct SOC JOC:
7Q10: 0.20 PF: 4.14 IWC: 97 Freq: Q
J J A S O N
- Pass - - Pass >100(P) -
Pass - - Pass -
Pass >100(P) - - Pass -
Pass - - Fail >100
Pass -
Region: ARO
7Q10:
I
Region: ARO
7Q10: 17
J
Region: MRO
70,10:
J
Basin:
FRB03
Feb May Aug Nov
PF:
IWC:
Freq: Q
J
A
S
O
Pass
-
Pass
Pass
Pass
Basin:
FRB02
Feb May Aug Nov
PF: 4.8
IWC: 22
Freq: Q
J
A
S
O
Pass
-
Pass
Pass
Pass
Pass
Basin:
CTB32
Mar Jun Sep Dec
PF:
IWC:
Freq: A
J
A
S
O
Pass
-
-
Pass
Pass
-
-
Pass
Pass
SOC JOC:
N
Pass
Pass
Pass
Fail
SOC JOC:
N
Pass
Pass
Pass
Pass
SOC JOC:
N
C
C
>100
G
C
C
Leeend: P= Fathead minnow (Pimohales oromelas). H=No Flow (facility is active). s = Solit test between Certified Labs Page 49 of 115

United States Environmental Protection Agency
Form Approved.
EPA Washington, D.C. 20460
OMB No. 2040-0057
Water Compliance Inspection Report
Approval expires 8-31-98
Section A: National Data System Coding (i.e., PCS)
Transaction Code NPDES yr/mo/day Inspection Type Inspector Fac Type
1 IN 1 2 u 3 I NCO020559 I11 121 23/06/07 I17 18I � I 19 I s I 201 I
211IIIII 111111III II III III1 I I IIIII IIIIIIIII II r6
Inspection
Work Days Facility Self -Monitoring Evaluation Rating B1 QA ---------------------- Reserved -------------------
67
I 72 I n, I 71 I 74 79 I I I I I I I80
701 I 71 I LL -1 I I
LJ
Section B: Facility Data
Name and Location of Facility Inspected (For Industrial Users discharging to POTW, also include
Entry Time/Date
Permit Effective Date
POTW name and NPDES permit Number)
09:30AM 23/06/07
19/08/01
Henderson Water Reclamation Facility
1646 W Andrews Ave
Exit Time/Date
Permit Expiration Date
Henderson NC 275362555
12:30PM 23/06/07
23/03/31
Name(s) of Onsite Representative(s)/Titles(s)/Phone and Fax Number(s)
Other Facility Data
Clarissa LipscombH CPO KLRWS ORC/252-438-2141 /2524387866
Clarissa M Lipscomb/ORC/252-438-2142/
Name, Address of Responsible Official/Title/Phone and Fax Number
Contacted
Terrell Blackmon,PO Box 1434 Henderson NC 275361434/City
Manager/252-430-5701 / No
Section C: Areas Evaluated During Inspection (Check only those areas evaluated)
Permit 0 Flow Measurement Operations & Maintenar Records/Reports
Self -Monitoring Progran 0 Sludge Handling Dispo: Facility Site Review Effluent/Receiving Wate
Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary)
(See attachment summary)
Name(s) and Signature(s) of Inspector(s) Agency/Office/Phone and Fax Numbers Date
Cheng Zhang DWR/RRO WQ/919-791-4200/
Kevin Fowler 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#

NPDES yr/mo/day Inspection Type
NCO020559 I11 12I 23/06/07 117 18 i c i
(Cont.)
Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary)
The current permit expired on March 31, 2023. Renewal application was received by the Division on
November 28, 2022.
The 4.14 MGD facility consists of the following units: influent pump station; dual bar screens; grit
removal system; biological nutrient removal system — 4 anaerobic basins, 2 anoxic zones, 2 oxidation
ditches with 4 aerators ( 100 HP); two secondary clarifiers; UV disinfection with sodium hypochlorite
backup; four (4) tertiary sand filters; post aeration; aerobic digester; sludge holding tank; waste
activated sludge pumps, screw thickener; and screw thickener discharge pump.
At the time of inspection, the following treatment units were not in used due to low flow: one of two
BNR ditches, and two of four tertiary filters.
Color of the influent in the oxidation ditch appeared chocolate brown. Foam covered about 50% of
the basin. Effluent flowing at the weirs of the secondary clarifier and clear well of the tertiary sand
filters appeared clear. Sludge blankets in the secondary clarifiers were less than a foot.
feet. The screw thickener was in operation at the time of inspection. The aerobic digester was about
3/4 full.
Discharge Monitoring Report records for for July 2022 and January 2023 were reviewed with lab
bench sheets and no transcription errors were noted. Chain of Custody forms are completed and
kept on site. A daily operation log book is maintained and kept on site. Records are maintained for at
least three years.
The laboratory was checked in a cursory manner. All calibrations of instruments and temperatures of
refrigerators and other equipment are recorded daily in a log book.
The following deficiencies were noted during the inspection:
1. Influent and effluent flow meters were last calibrated on February 2, 2022, permit requires flow
meters to be calibrated at least annually;
2. ORC visitation has not been documented.
Page#

Permit: NCO020559
Inspection Date: 06/07/2023
Owner -Facility: Henderson Water Reclamation Facility
Inspection Type: Compliance Evaluation
Operations & Maintenance Yes No NA NE
Is the plant generally clean with acceptable housekeeping? 0 ❑ ❑ ❑
Does the facility analyze process control parameters, for ex: MLSS, MCRT, Settleable ❑ ❑ ❑
Solids, pH, DO, Sludge Judge, and other that are applicable?
Comment: Facility analyze MLSS, DO, temperature, PH, settleable solids, sludge blanket for
process control
Permit
Yes
No
NA
NE
(If the present permit expires in 6 months or less). Has the permittee submitted a new
❑
❑
■
❑
application?
Is the facility as described in the permit?
❑
■
❑
❑
# Are there any special conditions for the permit?
0
❑
❑
❑
Is access to the plant site restricted to the general public?
0
❑
❑
❑
Is the inspector granted access to all areas for inspection?
■
❑
❑
❑
Comment: Influent pump station needs to be added to the treatment components list
Pump Station - Influent
Yes
No
NA
NE
Is the pump wet well free of bypass lines or structures?
0
❑
❑
❑
Is the wet well free of excessive grease?
■
❑
❑
❑
Are all pumps present?
0
❑
❑
❑
Are all pumps operable?
0
❑
❑
❑
Are float controls operable?
0
❑
❑
❑
Is SCADA telemetry available and operational?
0
❑
❑
❑
Is audible and visual alarm available and operational?
❑
❑
0
❑
Comment: Four pumps
Bar Screens
Yes
No
NA
NE
Type of bar screen
a.Manual
❑
b.Mechanical
Are the bars adequately screening debris?
■
❑
❑
❑
Is the screen free of excessive debris?
0
❑
❑
❑
Is disposal of screening in compliance?
0
❑
❑
❑
Is the unit in good condition?
0
❑
❑
❑
Comment: Two bar screens
Page# 3

Permit: NCO020559
Inspection Date: 06/07/2023
Bar Screens
Owner -Facility: Henderson Water Reclamation Facility
Inspection Type: Compliance Evaluation
Grit Removal
Type of grit removal
a.Manual
b.Mechanical
Is the grit free of excessive organic matter?
Is the grit free of excessive odor?
# Is disposal of grit in compliance?
Comment: One channel with grit pump in use, a spare channel for future expansion
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/1)
Are settelometer results acceptable?(400 to 800 ml/I in 30 minutes)
Yes No NA NE
Yes No NA NE
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
Yes No NA NE
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
❑ ■ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
Comment: One of the two oxidation ditches were online at the time of inspection. Anaerobic zone
(influent goes into) and anoxic zone (influent and returned mixed liquor go into) at the
head of each oxidation ditch, for biological nutrient removal. Foam covered more than
50% of the basin's surface. Operator explained that it was common in late spring/early
summer, and was trying to reduce the amount of foam by wasting more. MLSS was
about 2500 mg/L.
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?
0
❑
❑
❑
Are weirs level?
0
❑
❑
❑
Is the site free of weir blockage?
■
❑
❑
❑
Is the site free of evidence of short-circuiting?
■
❑
❑
❑
Is scum removal adequate?
0
❑
❑
❑
Is the site free of excessive floating sludge?
0
❑
❑
❑
Is the drive unit operational?
0
❑
❑
❑
Page# 4

Permit: NCO020559
Inspection Date: 06/07/2023
Owner -Facility: Henderson Water Reclamation Facility
Inspection Type: Compliance Evaluation
Secondary Clarifier
Is the return rate acceptable (low turbulence)?
Is the overflow clear of excessive solids/pin floc?
Is the sludge blanket level acceptable? (Approximately'/4 of the sidewall depth)
Comment: Sludge blankets were 0.25 and 0.75 foot on the day of inspection.
Filtration (High Rate Tertiary)
Type of operation:
Is the filter media present?
Is the filter surface free of clogging?
Is the filter free of growth?
Is the air scour operational?
Is the scouring acceptable?
Is the clear well free of excessive solids and filter media?
Yes
No
NA
NE
❑
❑
❑
❑
❑
❑
❑
❑
❑
Yes
No
NA NE
Down flow
■
❑
❑
❑
■
❑
❑
❑
■
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
Comment: Two of four filters were online due to low flow. Filters are backwashed once per da
Disinfection - UV
Yes
No
NA
NE
Are extra UV bulbs available on site?
0
❑
❑
❑
Are UV bulbs clean?
0
❑
❑
❑
Is UV intensity adequate?
■
❑
❑
❑
Is transmittance at or above designed level?
■
❑
❑
❑
Is there a backup system on site?
0
❑
❑
❑
Is effluent clear and free of solids?
0
❑
❑
❑
Comment: Two banks of UV in series, each with three modules. The UV units were being serviced
by a contractor at the time of insDection
Disinfection -Liquid
Yes
No
NA
NE
Is there adequate reserve supply of disinfectant?
❑
❑
■
❑
(Sodium Hypochlorite) Is pump feed system operational?
❑
❑
■
❑
Is bulk storage tank containment area adequate? (free of leaks/open drains)
❑
❑
0
❑
Is the level of chlorine residual acceptable?
❑
❑
■
❑
Is the contact chamber free of growth, or sludge buildup?
❑
❑
■
❑
Is there chlorine residual prior to de -chlorination?
❑
❑
0
❑
Comment: Backup system has not been used in the past years.
Page# 5

Permit: NC0020559 Owner -Facility:
Inspection Date: 06/07/2023 Inspection Type:
Henderson Water Reclamation Facility
Compliance Evaluation
De -chlorination
Yes
No
NA NE
Type of system ?
Liquid
Is the feed ratio proportional to chlorine amount (1 to 1)?
❑
❑
❑
Is storage appropriate for cylinders?
❑
❑
0
❑
# Is de -chlorination substance stored away from chlorine containers?
❑
❑
0
❑
Are the tablets the proper size and type?
❑
❑
0
❑
Comment: Backup system has not been used in the past years.
Are tablet de -chlorinators operational? ❑ ❑ ❑
Number of tubes in use?
Comment:
Aerobic Digester
Yes
No
NA
NE
Is the capacity adequate?
0
❑
❑
❑
Is the mixing adequate?
0
❑
❑
❑
Is the site free of excessive foaming in the tank?
■
❑
❑
❑
# Is the odor acceptable?
0
❑
❑
❑
# Is tankage available for properly waste sludge?
0
❑
❑
❑
Comment: The digester was about 3/4 full at the time of inspection. The one million gallon sludge
holding tank has not been used in the past year.
Pumps-RAS-WAS
Yes
No
NA
NE
Are pumps in place?
0
❑
❑
❑
Are pumps operational?
0
❑
❑
❑
Are there adequate spare parts and supplies on site?
■
❑
❑
❑
Comment: Three RAS-WAS pumps
Solids Handling Equipment
Is the equipment operational?
Is the chemical feed equipment operational?
Is storage adequate?
Is the site free of high level of solids in filtrate from filter presses or vacuum filters?
Is the site free of sludge buildup on belts and/or rollers of filter press?
Is the site free of excessive moisture in belt filter press sludge cake?
The facility has an approved sludge management plan?
Yes No NA NE
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
■ ❑ ❑ ❑
■ ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
Page# 6

Permit: NCO020559
Inspection Date: 06/07/2023
Solids Handling Equipment
Owner -Facility: Henderson Water Reclamation Facility
Inspection Type: Compliance Evaluation
Comment: Screw thickener was in operation at the time of inspection
Effluent Pipe
Is right of way to the outfall properly maintained?
Are the receiving water free of foam other than trace amounts and other debris?
If effluent (diffuser pipes are required) are they operating properly?
Comment:
Chemical Feed
Is containment adequate?
Is storage adequate?
Are backup pumps available?
Is the site free of excessive leaking?
Yes No NA NE
Yes
No
NA
NE
•
❑
❑
❑
•
❑
❑
❑
❑
❑
■
❑
Yes
No
NA
NE
❑
❑
■
❑
❑
❑
■
❑
❑
❑
■
❑
❑
❑
■
❑
Comment: Facility does not feed chemicals to sustain treatment processes (except that polymers
are fed to wasted sludge before being dewatered by the screw thickener
Standby Power
Is automatically activated standby power available?
Is the generator tested by interrupting primary power source?
Is the generator tested under load?
Was generator tested & operational during the inspection?
Do the generator(s) have adequate capacity to operate the entire wastewater site?
Is there an emergency agreement with a fuel vendor for extended run on back-up
power?
Is the generator fuel level monitored?
Comment: The generator is tested twice per month
Laboratory
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?
# 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?
Yes No NA NE
■ ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
■ ❑ ❑ ❑
Yes No NA NE
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
■ ❑ ❑ ❑
Page# 7

Permit: NCO020559 Owner -Facility: Henderson Water Reclamation Facility
Inspection Date: 06/07/2023 Inspection Type: Compliance Evaluation
Laboratory Yes No NA NE
Incubator (BOD) set to 20.0 degrees Celsius +/- 1.0 degrees? 0 ❑ ❑ ❑
Comment:
Influent Sampling
Yes
No
NA
NE
# Is composite sampling flow proportional?
0
❑
❑
❑
Is sample collected above side streams?
0
❑
❑
❑
Is proper volume collected?
■
❑
❑
❑
Is the tubing clean?
0
❑
❑
❑
# Is proper temperature set for sample storage (kept at less than or equal to 6.0
0
❑
❑
❑
degrees Celsius)?
Is sampling performed according to the permit?
0
❑
❑
❑
Comment:
Effluent Sampling
Yes
No
NA
NE
Is composite sampling flow proportional?
0
❑
❑
❑
Is sample collected below all treatment units?
0
❑
❑
❑
Is proper volume collected?
■
❑
❑
❑
Is the tubing clean?
0
❑
❑
❑
# 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:
Upstream / Downstream Sampling Yes No NA NE
Is the facility sampling performed as required by the permit (frequency, sampling type, 0 ❑ ❑ ❑
and sampling location)?
Comment:
Nutrient Removal
Yes
No
NA
NE
# Is total nitrogen removal required?
M
❑
❑
❑
# Is total phosphorous removal required?
0
❑
❑
❑
Type
Biological
# Is chemical feed required to sustain process?
❑
0
❑
❑
Is nutrient removal process operating properly?
M
❑
❑
❑
Page# 8

Permit: NCO020559 Owner -Facility: Henderson Water Reclamation Facility
Inspection Date: 06/07/2023 Inspection Type: Compliance Evaluation
Nutrient Removal Yes No NA NE
Comment: Chemical feed is not needed to sustain process
Flow Measurement - Influent
Yes
No
NA
NE
# Is flow meter used for reporting?
■
❑
❑
❑
Is flow meter calibrated annually?
❑
■
❑
❑
Is the flow meter operational?
■
❑
❑
❑
(If units are separated) Does the chart recorder match the flow meter?
❑
❑
■
❑
Comment: Flow meter was last calibrated on 2/2/2022
Flow Measurement - Effluent
Yes
No
NA
NE
# Is flow meter used for reporting?
■
❑
❑
❑
Is flow meter calibrated annually?
❑
■
❑
❑
Is the flow meter operational?
■
❑
❑
❑
(If units are separated) Does the chart recorder match the flow meter?
❑
❑
■
❑
Comment: Flow meter was last calibrated on 2/2/2022
Record Keeping
Yes
No
NA
NE
Are records kept and maintained as required by the permit?
■
❑
❑
❑
Is all required information readily available, complete and current?
■
❑
❑
❑
Are all records maintained for 3 years (lab. reg. required 5 years)?
■
❑
❑
❑
Are analytical results consistent with data reported on DMRs?
■
❑
❑
❑
Is the chain -of -custody complete?
■
❑
❑
❑
Dates, times and location of sampling
■
Name of individual performing the sampling
■
Results of analysis and calibration
■
Dates of analysis
■
Name of person performing analyses
■
Transported COCs
■
Are DMRs complete: do they include all permit parameters?
■
❑
❑
❑
Has the facility submitted its annual compliance report to users and DWQ?
■
❑
❑
❑
(If the facility is = or > 5 MGD permitted flow) Do they operate 24/7 with a certified
❑
❑
■
❑
operator on each shift?
Is the ORC visitation log available and current?
❑
■
❑
❑
Page# 9

Permit: NCO020559
Inspection Date: 06/07/2023
Owner -Facility: Henderson Water Reclamation Facility
Inspection Type: Compliance Evaluation
Record Keeping
Is the ORC certified at grade equal to or higher than the facility classification?
Is the backup operator certified at one grade less or greater than the facility
classification?
Is a copy of the current NPDES permit available on site?
Facility has copy of previous year's Annual Report on file for review?
Comment: ORC and backup ORC need to keep a visitation log
Yes
No
NA
NE
■
❑
❑
❑
■
❑
❑
❑
■
❑
❑
❑
■
❑
❑
❑
Page# 10

United States Environmental Protection Agency
Form Approved.
EPA Washington, D.C. 20460
OMB No. 2040-0057
Water Compliance Inspection Report
Approval expires 8-31-98
Section A: National Data System Coding (i.e., PCS)
Transaction Code NPDES yr/mo/day Inspection Type Inspector Fac Type
1 IN 2 u 3 I NC0020559 111 121 21/08/24 I17 18 L D I 19 I s I 201
211IIIII 111111III II III III1 I I IIIII IIIIIIIII II r6
Inspection
Work Days Facility Self -Monitoring Evaluation Rating B1 QA ---------------------- Reserved -------------------
67
I 72 I n, I 73 � I 74 79 I I I I I I I80
70 I I 71 I LL -1 I I
LJ
Section B: Facility Data
Name and Location of Facility Inspected (For Industrial Users discharging to POTW, also include
Entry Time/Date
Permit Effective Date
POTW name and NPDES permit Number)
10:OOAM 21/08/24
19/08/01
Henderson Water Reclamation Facility
1646 W Andrews Ave
Exit Time/Date
Permit Expiration Date
Henderson NC 275362555
12:OOPM 21/08/24
23/03/31
Name(s) of Onsite Representative(s)/Titles(s)/Phone and Fax Number(s)
Other Facility Data
Darrel P Johnson//252-431-6085 /
Name, Address of Responsible Official/Title/Phone and Fax Number
Contacted
Terrell Blackmon,PO Box 1434 Henderson NC 275361434/City
Manager/252-430-5701 / No
Section C: Areas Evaluated During Inspection (Check only those areas evaluated)
Pretreatment
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#

NPDES yr/mo/day Inspection Type
NCO020559 I11 12I 21/08/24 117 18 1 p I
Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary)
Page#

Permit: NC0020559
Inspection Date: 08/24/2021
Owner -Facility: Henderson Water Reclamation Facility
Inspection Type: Pretreatment Compliance
Yes No NA NE
Page#

NH3/TRC WLA Calculations
Henderson WRF
Permit No. NC0020559
Prepared By: Gary Perlmutter
Enter Design Flow (MGD): 4.14
Enter s7Q10 (cfs): 0.2
Enter w7Q10 (cfs): 0.4
Total Residual Chlorine (TRC)
Ammonia (Summer)
Daily Maximum Limit (ug/1)
Monthly Average Limit (mg NH3-N/1)
s7Q10 (CFS) 0.2
s7Q10 (CFS)
0.2
DESIGN FLOW (MGD) 4.14
DESIGN FLOW (MGD)
4.14
DESIGN FLOW (CFS) 6.417
DESIGN FLOW (CFS)
6.417
STREAM STD (UG/L) 17.0
STREAM STD (MG/L)
1.0
Upstream Bkgd (ug/1) 0
Upstream Bkgd (mg/1)
0.22
IWC (%) 96.98
IWC (%)
96.98
Allowable Conc. (ug/1) 18
Allowable Conc. (mg/1)
1.0
Ammonia (Winter)
Monthly Average Limit (mg NH3-N/1)
Fecal Coliform
w7Q10 (CFS)
0.4
Monthly Average Limit: 200/100ml
DESIGN FLOW (MGD)
4.14
(If DF >331; Monitor)
DESIGN FLOW (CFS)
6.417
(If DF<331; Limit)
STREAM STD (MG/L)
1.8
Dilution Factor (DF) 1.03
Upstream Bkgd (mg/1)
0.22
IWC (%)
94.13
Allowable Conc. (mg/1)
1.9
Total Residual Chlorine
1. Cap Daily Max limit at 28 ug/I to protect for acute toxicity
Ammonia (as NH3-N)
1. If Allowable Conc > 35 mg/l, Monitor Only
2. Monthly Avg limit x 3 = Weekly Avg limit (Municipals); capped at 35 mg/I
3. Monthly Avg limit x 5 = Daily Max limit (Non-Munis);
capped at 35 mg/I
Fecal Coliform
1. Monthly Avg limit x 2 = 400/100 ml = Weekly Avg limit (Municipals) = Daily Max limit (Non -Muni)

NH3/TRC WLA Calculations
Henderson WRF
Permit No. NC0020559
Prepared By: Gary Perlmutter
Enter Design Flow (MGD): 6
Enter s7Q10 (cfs): 0.2
Enter w7Q10 (cfs): 0.4
Total Residual Chlorine (TRC)
Daily Maximum Limit (ug/1)
Ammonia (Summer)
Monthly Average Limit (mg NH3-N/1)
s7Q10 (CFS)
0.2
s7Q10 (CFS)
0.2
DESIGN FLOW (MGD)
6
DESIGN FLOW (MGD)
6
DESIGN FLOW (CFS)
9.3
DESIGN FLOW (CFS)
9.3
STREAM STD (UG/L)
17.0
STREAM STD (MG/L)
1.0
Upstream Bkgd (ug/1)
0
Upstream Bkgd (mg/1)
0.22
IWC (%)
97.89
IWC (%)
97.89
Allowable Conc. (ug/1)
17
Allowable Conc. (mg/1)
1.0
Ammonia (Winter)
Monthly Average Limit (mg NH3-N/1)
Fecal Coliform
w7Q10 (CFS)
0.4
Monthly Average Limit:
200/100mi DESIGN FLOW (MGD)
6
(If DF >331; Monitor)
DESIGN FLOW (CFS)
9.3
(If DF<331; Limit)
STREAM STD (MG/L)
1.8
Dilution Factor (DF)
1.02 Upstream Bkgd (mg/1)
0.22
IWC (%)
95.88
Allowable Conc. (mg/1)
1.9
Total Residual Chlorine
1. Cap Daily Max limit at 28 ug/l to protect for acute toxicity
Ammonia (as NH3-N)
1. If Allowable Conc > 35 mg/l, Monitor Only
2. Monthly Avg limit x 3 = Weekly Avg limit (Municipals); capped at 35 mg/I
3. Monthly Avg limit x 5 = Daily Max limit (Non-Munis); capped at 35 mg/l
Fecal Coliform
1. Monthly Avg limit x 2 = 400/100 ml = Weekly Avg limit (Municipals) = Daily Max limit (Non -Muni)

Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators
MAXIMUM DATA POINTS = 58
REQUIRED DATA ENTRY
Table 1. Proiect Information
Facility Name
WWTP/WTP Class
NPDES Permit
Outfall
Flow, Qw (MGD)
Receiving Stream
HUC Number
Stream Class
❑ CHECK IF HQW OR ORW WQS
Henderson WRF
Grade IV
NCO020559
001
4.140
Nutbush Creek
03010102
C
❑ Apply WS Hardness WQC
7Q10s (cfs)
7Q10w (cfs)
30Q2 (cfs)
QA (cfs)
1Q10s (cfs)
0.20
0.40
0.50
3.50
0.17
_Effluent Hardness
Upstream Hardness
Combined Hardness Chronic
Combined Hardness Acute
51 mg/L (Avg)
67.17 mg/L (Avg)
I ------- 51.49 mg/L
I 51.42 mg/L — — — — -
'Fe rmittee-submitted DMRs and PPAs.
Data Source(s)
❑ CHECK TO APPLY MODEL
Par01
Par02
Par03
Par04
Par05
Par06111111
Par07
Par08
Par09
Par10
Par11
Par12
Par13
Par14
Par15
Par16
Par17
Par18
Par19
Par20
Par21
Par22
Par23
Par24
Table 2. Parameters of Concern
Name w4s Type Chronic ModIer 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
1.0184
FW
6.0785
ug/L
Chlorides
Aquatic Life
NC
230
FW
Chlorinated Phenolic Compounds
Water Supply
NC
1
A
ug/L
Total Phenolic Compounds
Aquatic Life
NC
300
A
ug/L
Chromium III
Aquatic Life
NC
212.7536
FW
1633.7075
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
14.6110
FW
20.6585
ug/L
Cyanide
Aquatic Life
NC
5
FW
22
10
ug/L
Fluoride
Aquatic Life
NC
1,800
FW
ug/L
Lead
Aquatic Life
NC
6.5970
FW
169.0311
ug/L
Mercury
Aquatic Life
NC
12
FW
0.5
ng/L
Molybdenum
Human Health
NC
2000
HH
ug/L
Nickel
Aquatic Life
NC
68.6058
FW
616.9605
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
1.0245
ug/L
Zinc
Aquatic Life
NC
233.7499
FW
231.5808
ug/L
20559 Freshwater RPA 2023, input
10/13/2023

H1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
REASONABLE POTENTIAL ANALYSIS
H2
Use "PASTE SPECIAL Use "PASTE SPECIAL
Effluent Hardness Values" then "COPY• Upstream Hardness Values" then "COPY"
. Maximum data . Maximum data
points = 58 points = 58
Date Data
BDL=1/2DL
3/12/2019
52
52
3/13/2019
52
52
3/14/2019
56
56
3/15/2019
60
60
3/18/2019
64
64
7/11/2019
52
52
8/7/2019
56
56
10/10/2019
52
52
1/9/2020
56
56
4/23/2020
56
56
7/16/2020
60
60
10/8/2020
44
44
1/14/2021
52
52
2/18/2021
52
52
3/11/2021
64
64
4/8/2021
64
64
5/5/2021
56
56
6/9/2021
40
40
7/15/2021
44
44
8/4/2021
40
40
9/8/2021
44
44
10/7/2021
48
48
11 /3/2021
44
44
12/1/2021
48
48
1/13/2022
44
44
4/7/2022
44
44
7/14/2022
40
40
7/21/2022
40
40
10/5/2022
60
60
1/10/2023
48
48
4/5/2023
48
48
7/5/2023
52
52
Results
Std Dev.
7.3966
Mean
51.0000
C.V.
0.1450
n
32
10th Per value
40.40 mg/L
Average Value
51.00 mg/L
Max. Value
64.00 mg/L
Date Data
BDL=1/2DL
Results
1 3/12/2019
58
58
Std Dev.
18.1124
2 3/13/2019
72
72
Mean
67.1739
3 3/14/2019
76
76
C.V.
0.2696
4 3/15/2019
80
80
n
23
5 3/18/2019
80
80
10th Per value
52.80 mg/L
6 7/9/2019
64
64
Average Value
67.17 mg/L
7 8/6/2019
82
82
Max. Value
84.00 mg/L
8 10/1/2019
72
72
9 1/7/2020
68
68
10 4/7/2020
80
80
11 7/7/2020
84
84
12 10/6/2020
84
84
13 1/5/2021
52
52
14 4/6/2021
76
76
15 7/6/2021
72
72
16 10/20/2021
76
76
17 1/6/2022
60
60
18 4/5/2022
1
1
19 7/12/2022
44
44
20 10/12/2022
80
80
21 1/10/2023
56
56
22 4/4/2023
68
68
23 7/18/2023
60
60
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
20559 Freshwater RPA 2023, data
-3- 10/13/2023

REASONABLE POTENTIAL ANALYSIS
Par01 & Par02
Date Data
1 4/11/2019 <
2 7/11/2019 <
3 8/7/2019 <
4 10/10/2019 <
5 1 /9/2020 <
6 4/23/2020 <
7 7/16/2020 <
8 10/8/2020 <
9 1/14/2021 <
10 2/18/2021 <
11 3/11/2021 <
12 4/8/2021 <
13 5/5/2021 <
14 6/9/2021 <
15 7/15/2021 <
16 8/4/2021 <
17 9/8/2021 <
18 10/7/2021 <
19 11 /3/2021 <
20 12/1/2021 <
21 1/13/2022 <
22 4/7/2022 <
23 7/14/2022 <
24 7/21/2022 <
25 4/5/2023 <
26 7/5/2023 <
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
Arsenic
BDL=1/2DL
Results
2 1
Std Dev.
2 1
Mean
2 1
C.V.
2 1
n
2 1
2 1
Mult Factor =
2 1
Max. Value
2 1
Max. Fred Cw
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
Use "PASTE SPECIAL Par03
Values" then "COPY"
. Maximum data
points = 58
1.0000
0.0000
26
1.00
1.0 ug/L
1.0 ug/L
Use "PASTE SPECIAL
Beryllium Values" then "COPY"
. Maximum data
points = 58
Date
Data BDL=1/2DL
Results
1
1/9/2020
< 0.5 0.25
Std Dev.
2.7424
2
4/8/2021
< 0.5 0.25
Mean
1.8333
3
7/21/2022
< 10 5
C.V. (default)
0.6000
4
n
3
5
6
Mult Factor =
3.00
7
Max. Value
5.00 ug/L
8
Max. Fred Cw
15.00 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
-4-
20559 Freshwater RPA 2023, data
10/13/2023

REASONABLE POTENTIAL ANALYSIS
Par04
Cadmium
Date
Data
BDL=1/2DL
Results
1
4/11/2019
<
0.15
0.075
Std Dev.
2
7/11/2019
<
0.15
0.075
Mean
3
8/7/2019
<
0.15
0.075
C.V.
4
10/10/2019
<
0.15
0.075
n
5
1 /9/2020
<
0.15
0.075
6
4/23/2020
<
0.15
0.075
Mult Factor =
7
7/16/2020
<
0.15
0.075
Max. Value
8
10/8/2020
<
0.15
0.075
Max. Fred Cw
9
1/14/2021
<
0.15
0.075
10
2/18/2021
<
0.15
0.075
11
3/11/2021
<
0.15
0.075
12
4/8/2021
<
0.15
0.075
13
5/5/2021
<
0.15
0.075
14
6/9/2021
<
0.15
0.075
15
7/15/2021
<
0.15
0.075
16
8/4/2021
<
0.15
0.075
17
9/8/2021
<
0.15
0.075
18
10/7/2021
<
0.15
0.075
19
11 /3/2021
<
0.15
0.075
20
12/1/2021
<
0.15
0.075
21
1/13/2022
<
0.15
0.075
22
4/7/2022
<
0.15
0.075
23
7/14/2022
<
0.15
0.075
24
7/21/2022
<
0.15
0.075
25
10/5/2022
<
0.15
0.075
26
1/10/2023
<
0.15
0.075
27
4/5/2023
<
0.15
0.075
28
7/5/2023
<
0.15
0.075
29
3
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 Pdr05
Values" then "COPY"
. Maximum data
points = 58
0.0750
0.0000
28
1.00
0.075 ug/L
0.075 ug/L
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Chlorides
Date Data BDL=1/2DL Results
Std Dev.
Mean
C.V.
n
Mult Factor =
Max. Value
Max. Fred Cw
Use "PASTE SPECIAL -
Values" then "COPY" .
Maximum data points =
58
NO DATA
NO DATA
0
N/A
N/A mg/L
N/A mg/L
-5-
20559 Freshwater RPA 2023, data
10/13/2023

REASONABLE POTENTIAL ANALYSIS
Par06
Chlorinated Phenolic Compounds
Use "PASTE SPECIAL
valves" imthenum •copydata
. Max
Par07
Total Phenolic Compounds
points = 58
Date Data BDL=1/2DL Results
Date
Data BDL=1/2DL
Results
1
Std Dev.
NO DATA
1
1/9/2020
11 11
Std Dev.
2
Mean
NO DATA
2
4/8/2021
< 10 5
Mean
3
C.V.
NO DATA
3
7/21/2022
19 19
C.V. (default)
4
n
0
4
n
5
5
6
Mult Factor =
N/A
6
Mult Factor =
7
Max. Value
N/A ug/L
7
Max. Value
8
Max. Fred Cw
N/A ug/L
8
Max. Fred Cw
9
9
10
10
11
11
12
12
13
13
14
14
15
15
16
16
17
17
18
18
19
19
20
20
21
21
22
22
23
23
24
24
25
25
26
26
27
27
28
28
29
29
30
30
31
31
32
32
33
33
34
34
35
35
36
36
37
37
38
38
39
39
40
40
41
41
42
42
43
43
44
44
45
45
46
46
47
47
48
48
49
49
50
50
51
51
52
52
53
53
54
54
55
55
56
56
57
57
58
58
Use "PASTE SPECIAL
Values" then "COPY"
. Maximum data
points = 58
11.6667
0.6000
3
3.00
19.0 ug/L
57.0 ug/L
20559 Freshwater RPA 2023, data
-6- 10/13/2023

REASONABLE POTENTIAL ANALYSIS
Par08
Chromium III
Date
Data BDL=1/2DL Results
1
Std Dev.
2
Mean
3
C.V.
4
n
5
6
Mult Factor =
7
Max. Value
8
Max. Fred Cw
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Pdr09
Use "PASTE SPECIAL
Values" then "COPY"
Chromium VI
. Maximum data
points = 58
Date
Data BDL=1/2DL Results
NO DATA
1
Std Dev.
NO DATA
2
Mean
NO DATA
3
C.V.
0
4
n
5
N/A
6
Mult Factor =
N/A Ng/L
7
Max. Value
N/A Ng/L
8
Max. Fred Cw
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use "PASTE SPECIAL
Values" then "COPY'
. Maximum data
points = 58
NO DATA
NO DATA
NO DATA
0
N/A
N/A Ng/L
N/A Ng/L
20559 Freshwater RPA 2023, data
-7- 10/13/2023

Par10
Date Data
1 4/11/2019 <
2 7/11/2019 <
3 8/7/2019 <
4 10/10/2019 <
5 1 /9/2020 <
6 4/23/2020 <
7 7/16/2020 <
8 10/8/2020 <
9 1/14/2021 <
10 2/18/2021 <
11 3/11/2021 <
12 4/8/2021 <
13 5/5/2021 <
14 6/9/2021 <
15 7/15/2021 <
16 8/4/2021 <
17 9/8/2021 <
18 10/7/2021 <
19 11 /3/2021 <
20 12/1/2021 <
21 1/13/2022 <
22 4/7/2022 <
23 7/14/2022 <
24 7/21/2022 <
25 4/5/2023 <
26 7/5/2023 <
27
28
29
30 .
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
REASONABLE POTENTIAL ANALYSIS
Pall
Use "PASTE SPECIAL Use "PASTE SPECIAL
Chromium, Total Values" then "COPY" Copper Values" then "COPY"
. Maximum data . Maximum data
points = 58 points = 58
BDL=1/2DL
Results
2 1
Std Dev.
2 1
Mean
2 1
C.V.
2 1
n
2 1
2 1
Mult Factor =
2 1
Max. Value
2 1
Max. Fred Cw
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
1.0000
0.0000
26
1.00
1.0 Ng/L
1.0 Ng/L
Date
Data
BDL=1/2DL
Results
1
4/11/2019
2
2
Std Dev.
0.8400
2
7/11/2019
3
3
Mean
1.6653
3
8/7/2019
3
3
C.V.
0.5044
4
9/4/2019
4
4
n
49
5
10/10/2019
3
3
6
11/6/2019
3
3
Mult Factor =
1.04
7
12/4/2019
2
2
Max. Value
4.00 ug/L
8
1/9/2020
2
2
Max. Fred Cw
4.16 ug/L
9
2/5/2020
2
2
10
3/4/2020
2
2
11
4/23/2020
2
2
12
5/6/2020
<
2
1
13
6/3/2020
<
2
1
14
7/16/2020
2
2
15
8/5/2020
2
2
16
9/2/2020
3
3
17
10/8/2020
<
2
1
18
11/4/2020
<
2
1
19
12/2/2020
<
2
1
20
1/14/2021
<
2
1
21
2/18/2021
<
2
1
22
3/11/2021
2
2
23
4/8/2021
<
2
1
24
5/5/2021
<
2
1
25
6/9/2021
<
2
1
26
7/15/2021
<
2
1
27
8/4/2021
<
2
1
28
9/8/2021
<
2
1
<
2
1
F10/7/2021
11/3/2021
<
2
1
12/1/2021
<
2
1
32
1/13/2022
<
2
1
33
2/2/2022
<
2
1
34
3/2/2022
<
2
1
35
4/7/2022
2.6
2.6
36
5/4/2022
2
2
37
6/8/2022
2
2
38
7/14/2022
<
2
1
39
7/21/2022
<
2
1
40
10/5/2022
<
2
1
41
11/2/2022
<
2
1
42
12/7/2022
3
3
43
1/10/2023
2
2
44
2/8/2023
3
3
45
3/8/2023
3
3
46
4/5/2023
<
2
1
47
5/3/2023
<
2
1
48
6/7/2023
<
2
1
49
7/5/2023
<
2
1
50
51
52
53
54
55
56
57
58
20559 Freshwater RPA 2023, data
-8- 10/13/2023

REASONABLE POTENTIAL ANALYSIS
Par12
Par13
Use "PASTE SPECIAL
Use "PASTE SPECIAL
Cyanide
Values" then "COPY•
Fluoride
Values" then "COPY"
. Maximum data
. Maximum data
points = 58
points = 58
Date Data
BDL=1/2DL
Results
Date Data
BDL=1/2DL Results
1
1/9/2020
7 5
Std Dev.
0.0000
1
Std Dev.
NO DATA
2
4/8/2021 <
5 5
Mean
5.00
2
Mean
NO DATA
3
7/21/2022 <
5 5
C.V. (default)
0.6000
3
C.V.
NO DATA
4
n
3
4
n
0
5
5
6
Mult Factor =
3.00
6
Mult Factor =
N/A
7
Max. Value
5.0 ug/L
7
Max. Value
N/A ug/L
8
Max. Fred Cw
15.0 ug/L
8
Max. Fred Cw
N/A ug/L
9
9
10
10
11
11
12
12
13
13
14
14
15
15
16
16
17
17
18
18
19
19
20
20
21
21
22
22
23
23
24
24
25
25
26
26
27
27
28
28
29
29
30
30
31
31
32
32
33
33
34
34
35
35
36
36
37
37
38
38
39
39
40
40
41
41
42
42
43
43
44
44
45
45
46
46
47
47
48
48
49
49
50
50
51
51
52
52
53
53
54
54
55
55
56
56
57
57
58
58
20559 Freshwater RPA 2023, data
-9- 10/13/2023

REASONABLE POTENTIAL ANALYSIS
Par14
Lead
Date
BDL=1/2DL
Results
1 4/11/2019
< 0.5
0.25
Std Dev.
2 7/11/2019
< 0.5
0.25
Mean
3 8/7/2019
< 0.5
0.25
C.V.
4 10/10/2019
< 0.5
0.25
n
5 1/9/2020
< 0.5
0.25
6 4/23/2020
< 0.5
0.25
Mult Factor =
7 7/16/2020
< 0.5
0.25
Max. Value
8 10/8/2020
< 0.5
0.25
Max. Fred Cw
9 1/14/2021
< 0.5
0.25
10 2/18/2021
< 0.5
0.25
11 3/11/2021
< 0.5
0.25
12 4/8/2021
< 0.5
0.25
13 5/5/2021
< 0.5
0.25
14 6/9/2021
< 0.5
0.25
15 7/15/2021
< 0.5
0.25
16 8/4/2021
< 0.5
0.25
17 9/8/2021
< 0.5
0.25
18 10/7/2021
< 0.5
0.25
19 11/3/2021
< 0.5
0.25
20 12/1/2021
< 0.5
0.25
21 1/13/2022
< 0.5
0.25
22 4/7/2022
< 0.5
0.25
23 7/14/2022
< 0.5
0.25
24 7/21/2022
< 0.5
0.25
25 4/5/2023
< 0.5
0.25
26 7/5/2023
< 0.5
0.25
27
28
29
30 .
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use "PASTE SPECIAL Par15
Values" then "COPY"
. Maximum data
points = 58
0.2500
0.0000
26
1.00
0.250 ug/L
0.250 ug/L
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use "PASTE SPECIAL
Mercury
Values" then "COPY"
. Maximum data
points = 58
Date Data BDL=1/2DL Results
Std Dev.
NO DATA
Mean
NO DATA
C.V.
NO DATA
n
0
Mult Factor =
N/A
Max. Value
N/A ng/L
Max. Fred Cw
N/A ng/L
-10-
20559 Freshwater RPA 2023, data
10/13/2023

REASONABLE POTENTIAL ANALYSIS
Par16
Date Data
1 4/11/2019
2 7/11/2019
3 8/7/2019
4 10/10/2019
5 1 /9/2020 <
6 4/23/2020 <
7 7/16/2020 <
8 10/8/2020 <
9 1/14/2021 <
10 2/18/2021 <
11 3/11/2021 <
12 4/8/2021
13 5/5/2021 <
14 6/9/2021
15 7/15/2021 <
16 8/4/2021 <
17 9/8/2021 <
18 10/7/2021 <
19 11 /3/2021 <
20 12/1/2021 <
21 1/13/2022 <
22 4/7/2022 <
23 7/14/2022
24 7/21/2022 <
25 4/5/2023 <
26 7/5/2023 <
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
Molybdenum
BDL=1/2DL
Results
4 4
Std Dev.
6 6
Mean
3 3
C.V.
2 2
n
2 1
2 1
Mult Factor =
2 1
Max. Value
2 1
Max. Fred Cw
2 1
2 1
2 1
9 9
2 1
2 2
2 1
2 1
2 1
2 1
2 1
2 1
2 1
2 1
3 3
2 1
2 1
2 1
Use "PASTE SPECIAL Par17 & Pdr18
Values" then "COPY" Nickel
. Maximum data
points = 58
1.8462
1.0242
26
1.42
9.0 ug/L
12.8 ug/L
Date
Data
BDL=1/2DL
Results
1 4/11/2019
2.4
2.4
Std Dev.
2 7/11/2019
4.5
4.5
Mean
3 8/7/2019
3.9
3.9
C.V.
4 10/10/2019
4.6
4.6
n
5 1 /9/2020
2
2
6 4/23/2020
2.6
2.6
Mult Factor =
7 7/16/2020
4.1
4.1
Max. Value
8 10/8/2020
3.5
3.5
Max. Fred Cw
9 1/14/2021
3.1
3.1
10 2/18/2021
2.6
2.6
11 3/11/2021
6.6
6.6
12 4/8/2021
8.5
8.5
13 5/5/2021
4.6
4.6
14 6/9/2021
5
5
15 7/15/2021
4.2
4.2
16 8/4/2021
4.5
4.5
17 9/8/2021
4.6
4.6
18 10/7/2021
4.5
4.5
19 11 /3/2021
5
5
20 12/1/2021
2.9
2.9
21 1/13/2022
3
3
22 4/7/2022
2.7
2.7
23 7/14/2022
3.5
3.5
24 7/21/2022
3
3
25 4/5/2023
2.5
2.5
26 5/3/2023
2.4
2.4
27 6/7/2023
3.7
3.7
28 7/5/2023
4.3
4.3
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
3.8857
0.3579
28
1.14
8.5 Ng/L
9.7 Ng/L
20559 Freshwater RPA 2023, data
11 - 10/13/2023

REASONABLE POTENTIAL ANALYSIS
Par19
Date Data
1 4/11/2019 <
2 7/11/2019 <
3 8/7/2019 <
4 10/10/2019 <
5 1 /9/2020 <
6 4/23/2020 <
7 7/16/2020 <
8 10/8/2020 <
9 1/14/2021 <
10 2/18/2021 <
11 3/11/2021 <
12 4/8/2021 <
13 5/5/2021 <
14 6/9/2021 <
15 7/15/2021 <
16 8/4/2021 <
17 9/8/2021 <
18 10/7/2021 <
19 11 /3/2021 <
20 12/1/2021 <
21 1/13/2022 <
22 4/7/2022 <
23 7/14/2022 <
24 7/21/2022 <
25 10/5/2022 <
26 1/10/2023 <
27 4/5/2023 <
28 7/5/2023 <
29
3
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
Selenium
BDL=1/2DL
Results
0.5
Std Dev.
0.5
Mean
0.5
C.V.
0.5
n
0.5
0.5
Mult Factor =
0.5
Max. Value
0.5
Max. Fred Cw
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
Use "PASTE SPECIAL Par20
Values" then "COPY"
. Maximum data
points = 58
0.5000
0.0000
28
1.00
0.5 ug/L
0.5 ug/L
Use "PASTE SPECIAL
Silver Values" then "COPY"
. Maximum data
points = 58
Date
Data
BDL=1/2DL
Results
1 4/11/2019
<
0.5
0.25
Std Dev.
0.4252
2 7/11/2019
<
0.5
0.25
Mean
0.3304
3 8/7/2019
<
0.5
0.25
C.V.
1.2871
4 10/10/2019
<
0.5
0.25
n
28
5 1/9/2020
<
0.5
0.25
6 4/23/2020
<
0.5
0.25
Mult Factor =
1.44
7 7/16/2020
<
0.5
0.25
Max. Value
2.500 ug/L
8 10/8/2020
<
0.5
0.25
Max. Fred Cw
3.600 ug/L
9 1/14/2021
<
0.5
0.25
10 2/18/2021
<
0.5
0.25
11 3/11/2021
<
0.5
0.25
12 4/8/2021
<
0.5
0.25
13 5/5/2021
<
0.5
0.25
14 6/9/2021
<
0.5
0.25
15 7/15/2021
<
0.5
0.25
16 8/4/2021
<
0.5
0.25
17 9/8/2021
<
0.5
0.25
18 10/7/2021
<
0.5
0.25
19 11/3/2021
<
0.5
0.25
20 12/1/2021
<
0.5
0.25
21 1/13/2022
<
0.5
0.25
22 4/7/2022
<
0.5
0.25
23 7/14/2022
<
0.5
0.25
24 7/21/2022
<
0.5
0.25
25 10/5/2022
<
0.5
0.25
26 1/10/2023
<
5
2.5
27 4/5/2023
<
0.5
0.25
28 7/5/2023
<
0.5
0.25
290 0.31
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
-12-
20559 Freshwater RPA 2023, data
10/13/2023

REASONABLE POTENTIAL ANALYSIS
Par21
Zinc
Date
Data
BDL=1/2DL
Results
1
1/6/2021
275
275
Std Dev.
2
1/14/2021
518
518
Mean
3
1/20/2021
263
263
C.V.
4
1/27/2021
258
258
n
5
2/3/2021
296
296
6
2/10/2021
205
205
Mult Factor =
7
2/18/2021
128
128
Max. Value
8
2/24/2021
96
96
Max. Fred Cw
9
3/3/2021
195
195
10
3/11/2021
193
193
11
3/17/2021
170
170
12
3/24/2021
159
159
13
3/31/2021
150
150
14
4/8/2021
145
145
15
4/14/2021
121
121
16
4/21/2021
166
166
17
4/28/2021
151
151
18
5/5/2021
139
139
19
5/12/2021
190
190
20
5/19/2021
245
245
21
5/26/2021
181
181
22
6/2/2021
183
183
23
6/9/2021
194
194
24
6/16/2021
178
178
25
6/23/2021
187
187
26
6/30/2021
179
179
27
7/7/2021
256
256
28
7/15/2021
194
194
29
7/21/2021
220
220
30
7/28/2021
184
184
31
8/4/2021
168
168
32
8/11/2021
206
206
33
8/18/2021
276
276
34
8/25/2021
164
164
35
9/1/2021
151
151
36
9/8/2021
157
157
37
9/15/2021
149
149
38
9/22/2021
132
132
39
9/29/2021
130
130
40
10/7/2021
121
121
41
10/13/2021
117
117
42
10/20/2021
108
108
43
10/27/2021
88
88
44
11/3/2021
83
83
45
12/1 /2021
127
127
46
1/13/2022
120
120
47
4/7/2022
73
73
48
7/14/2022
43
43
49
7/21/2022
29
29
50
4/5/2023
35
35
51
52
7/5/2023
31
31
53
54
55
56
57
58
Use "PASTE SPECIAL Par22
Values" then "COPY"
. Maximum data
points = 58
167.1961
0.4813
51
1.03
518.0 ug/L
533.5 ug/L
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Use "PASTE SPECIAL
O
Values" then "COPY"
. Maximum data
points = 58
Date Data BDL=1/2DL Results
Std Dev.
NO DATA
Mean
NO DATA
C.V.
NO DATA
n
0
Mult Factor =
N/A
Max. Value
N/A
Max. Fred Cw
N/A
-13-
20559 Freshwater RPA 2023, data
10/13/2023

Henderson WRF - Outfall 001
NCO020559 Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators Qw = 4.14 MGD
MAXIMUM
Qw (MGD) =
4.1400
1Q10S (cfs) =
0.17
7Q10S (cfs) =
0.20
7Q10W (cfs) =
0.40
30Q2 (cfs) =
0.50
Avg. Stream Flow, QA (cfs) =
3.50
Receiving Stream: Nutbush Creek HUC 03010102
DATA POINTS = 58
WWTP/WTP Class:
Grade IV
IWC% @ 1Q10S =
97.41915895
IWC% @ 7Q10S =
96.97748224
IWC% @ 7Q10W =
94.13231627
IWC% @ 30Q2 =
92.7714327
rW%C @ QA =
64.70706867
Stream Class:
C
COMBINED HARDNESS (mg/L)
Acute = 51.42 mg/L
Chronic = 51.49 mg/L
PARAMETER
NC STANDARDS OR EPA CRITERIA
Y)
REASONABLE POTENTIAL RESULTS
RECOMMENDED ACTION
TYPE
J
a
z
Applied
Chronic Acute
n # Det. Max Pred Cw Allowable Cw
Standard
Acute (FW): 349.0
Arsenic
C
150 FW(7Q10s) 340
ug L
-
- - -
26 0
1.0
Chronic (FW): 154.7
Max MDL = 2
Arsenic
C
10 HH/WS(Qavg)
ug/L
NO DETECTS
Chronic (HH): 15.5
No detects - no monitoring or limits required
Max MDL = 2
Acute: 66.72
Beryllium
NC
6.5 FW(7Q10s) 65
ug L
3 0
15.00
Note: n 5 9
C.V. (default)
Chronic: 6.70
No detects - no monitoring or limits required
Limited data set
NO DETECTS
Max MDL = 10
Acute: 6.240
Cadmium
NC
1.0184 FW(7Q10s) 6.0785
ug/L
28 0
0.075
Chronic: 1.050
No detects - no monitoring or limits required
NO DETECTS
Max MDL = 0.15
Acute: NO WQS
Chlorides
NC
230 FW(7Q10s)
mg;L
0 0
N/A
Chronic:----- 237.2
Acute: NO WQS
Chlorinated Phenolic Compounds
NC
1 A(30Q2)
ug/L
0 0
N/A
------------------------------
Chronic:----- 1.1
Acute: NO WQS
Total Phenolic Compounds
NC
300 A(30Q2)
ug/L
3 2
57.0
Note: n 5 9
C.V. (default)
Chronic: 323.4
No RP for limited dataset (n<8 samples). No
Limited data set
No value > Allowable Cw
monitoring or limits required
Acute: 1,677.0
Chromium III
NC
212.7536 FW(7Q10s) 1633.7075
µg/L
0 0
N/A
Chronic:----- 219.4
Acute: 16.4
Chromium VI
NC
11 FW(7Q10s) 16
µg L
0 0
N/A
Chronic:----- 11.3 ------------------------------
Chromium, Total
NC
µg/L
26 0
1.0
Max reported value = 1
No detects - no monitoring or limits required
NO DETECTS
Max MDL = 2
20559 Freshwater RPA 2023, rpa
Page 14 of 15 10/13/2023

Henderson WRF - Outfall 001
NCO020559 Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators Qw = 4.14 MGD
Acute: 21.21
Copper
NC
14.6110 FW(7Q10s) 20.6585
ug/L
49 22
4.16
Chronic: 15.07
No RP, Predicted Max < 50% of Allowable Cw - No
No value > Allowable Cw
Monitoring required
Acute: 22.6
Cyanide
NC
5 FW(7QlOs) 22
10
ug/L
3 1
15.0
Note: n < 9
C.V. (default)
Chronic: 5.2
All values < 10 considered compliant; no monitoring
Limited data set
No value > Allowable Cw
or limits required
Acute: NO WQS
Fluoride
NC
1800 FW(7Q10s)
ug/L
0 0
N/A
Chronic:-----1,856.1 -----------------------------
Acute: 173.509
Lead
NC
6.5970 FW(7QIOs) 169.0311
ug/L
26 0
0.250
Chronic: 6.803
No detects - no monitoring or limits required
NO DETECTS
Max MDL = 0.5
Acute: NO WQS
Mercury
NC
12 FW(7Q10s)
0.5
ng/L
0 0
N/A
---
-------------------------
Chronic:----- 12.4
Acute: NO WQS
Molybdenum
NC
2000 HH(7QlOs)
ug/L
26 7
12.8
Chronic: 2,062.3
No RP, Predicted Max < 50% of Allowable Cw - No
No value > Allowable Cw
Monitoring required
Acute (FW): 633.3
Nickel
NC
68.6058 FW(7Q10s) 616.9605
µg/L
28 28
9.7
Chronic (FW): 70.7
No RP, Predicted Max < 50% of Allowable Cw - No
No value > Allowable Cw ------------------------------
Monitoring required
Nickel
NC
25.0000 WS(7Q10s)
µg/L
Chronic (WS): 25.8
No value > Allowable Cw
Acute: 57.5
Selenium
NC
5 FW(7Q10s) 56
ug/L
28 0
0.5
_ _ _ _ _ _ _ _
Chronic: 5.2
_ _ _ _ _ _ _ _ _ _ _ _
No detects - no monitoring or limits required
NO DETECTS
Max MDL = 1
Acute: 1.052
Silver
NC
0.06 FW(7Q10s) 1.0245
ug/L
28 0
3.600
Chronic: 0.062
All data < 0.5 ug/L except for one value of 5.8 ug/L on
NO DETECTS
Max MDL = 5
6/7/2021
Acute: 237.7
Zinc
NC
233.7499 FW(7QIOs) 231.5808
ug/L
51 51
533.5
Chronic: 241.0
RP shown - apply Monthly Monitoring with Limit
8 values > Allowable Cw
Acute:
0 0
N/A
Acute:
0 0
N/A
Chronic:
20559 Freshwater RPA 2023, rpa
Page 15 of 15 10/13/2023

Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators
MAXIMUM DATA POINTS = 58
REQUIRED DATA ENTRY
Table 1. Proiect Information
Facility Name
WWTP/WTP Class
NPDES Permit
Outfall
Flow, Qw (MGD)
Receiving Stream
HUC Number
Stream Class
❑ CHECK IF HQW OR ORW WQS
Henderson WRF
Grade IV
NCO020559
001
6.000
Nutbush Creek
03010102
C
❑ Apply WS Hardness WQC
7Q10s (cfs)
7Q10w (cfs)
30Q2 (cfs)
QA (cfs)
1Q10s (cfs)
0.20
0.40
0.50
3.50
0.17 JL
_Effluent Hardness
Upstream Hardness
Combined Hardness Chronic
Combined Hardness Acute
51 mg/L (Avg)
67.17 mg/L (Avg)
I ------- 51.34 mg/L
I 51.29 mg/L — — — — -
'Fe rmittee-submitted DMRs and PPAs.
Data Source(s)
❑ CHECK TO APPLY MODEL
Par01
Par02
Par03
Par04
Par05
Par06111111
Par07
Par08
Par09
Par10
Par11
Par12
Par13
Par14
Par15
Par16
Par17
Par18
Par19
Par20
Par21
Par22
Par23
Par24
Table 2. Parameters of Concern
Name w4s Type Chronic ModIer 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
1.0162
FW
6.0654
ug/L
Chlorides
Aquatic Life
NC
230
FW
Chlorinated Phenolic Compounds
Water Supply
NC
1
A
ug/L
Total Phenolic Compounds
Aquatic Life
NC
300
A
ug/L
Chromium III
Aquatic Life
NC
212.2514
FW
1630.3999
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
14.5750
FW
20.6104
ug/L
Cyanide
Aquatic Life
NC
5
FW
22
10
ug/L
Fluoride
Aquatic Life
NC
1,800
FW
ug/L
Lead
Aquatic Life
NC
6.5760
FW
168.5679
ug/L
Mercury
Aquatic Life
NC
12
FW
0.5
ng/L
Molybdenum
Human Health
NC
2000
HH
ug/L
Nickel
Aquatic Life
NC
68.4385
FW
615.6702
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
1.0202
ug/L
Zinc
Aquatic Life
NC
233.1791
FW
231.0957
ug/L
20559 Freshwater RPA 2023, input
10/13/2023

Henderson WRF - Outfall 001
NCO020559 Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators Qw = 6 MGD
MAXIMUM
Qw (MGD) =
6.0000
1Q10S (cfs) =
0.17
7Q10S (cfs) =
0.20
7Q10W (cfs) =
0.40
30Q2 (cfs) =
0.50
Avg. Stream Flow, QA (cfs) =
3.50
Receiving Stream: Nutbush Creek HUC 03010102
DATA POINTS = 58
WWTP/WTP Class:
Grade IV
IWC% @ 1Q10S =
98.20485744
IWC% @ 7Q10S =
97.89473684
IWC% @ 7Q10W =
95.87628866
IWC% @ 30Q2 =
94.89795918
rW%C @ QA =
72.65625
Stream Class:
C
COMBINED HARDNESS (mg/L)
Acute = 51.29 mg/L
Chronic = 51.34 mg/L
PARAMETER
NC STANDARDS OR EPA CRITERIA
Y)
REASONABLE POTENTIAL RESULTS
RECOMMENDED ACTION
TYPE
J
a
z
Applied
Chronic Acute
n # Det. Max Pred Cw Allowable Cw
Standard
Acute (FW): 346.2
Arsenic
C
150 FW(7Q10s) 340
ug L
-
- - -
26 0
1.0
Chronic (FW): 153.2
Max MDL = 2
Arsenic
C
10 HH/WS(Qavg)
ug/L
NO DETECTS
Chronic (HH): 13.8
No detects - no monitoring or limits required
Max MDL = 2
Acute: 66.19
Beryllium
NC
6.5 FW(7Q10s) 65
ug L
3 0
15.00
Note: n 5 9
C.V. (default)
Chronic: 6.64
No detects - no monitoring or limits required
Limited data set
NO DETECTS
Max MDL = 10
Acute: 6.176
Cadmium
NC
1.0162 FW(7Q10s) 6.0654
ug/L
28 0
0.075
Chronic: 1.038
No detects - no monitoring or limits required
NO DETECTS
Max MDL = 0.15
Acute: NO WQS
Chlorides
NC
230 FW(7Q10s)
mg;L
0 0
N/A
Chronic:----- 234.9
Acute: NO WQS
Chlorinated Phenolic Compounds
NC
1 A(30Q2)
ug/L
0 0
N/A
------------------------------
Chronic:----- 1.1
Acute: NO WQS
Total Phenolic Compounds
NC
300 A(30Q2)
ug/L
3 2
57.0
Note: n 5 9
C.V. (default)
Chronic: 316.1
No RP for limited dataset (n<g samples). No
Limited data set
No value > Allowable Cw
monitoring or limits required
Acute: 1,660.2
Chromium III
NC
212.2514 FW(7Q10s) 1630.3999
µg/L
0 0
N/A
Chronic:----- 216.8
Acute: 16.3
Chromium VI
NC
11 FW(7Q10s) 16
µg L
0 0
N/A
Chronic:----- 11.2 ------------------------------
Chromium, Total
NC
µg/L
26 0
1.0
Max reported value = 1
No detects - no monitoring or limits required
NO DETECTS
Max MDL = 2
20559 Freshwater RPA 2023, rpa
Page 2 of 3 10/13/2023

Henderson WRF - Outfall 001
NCO020559 Freshwater RPA - 95% Probability/95% Confidence Using Metal Translators Qw = 6 MGD
Acute: 20.99
Copper
NC
14.5750 FW(7Q10s) 20.6104
ug/L
49 22
4.16
Chronic: 14.89
No RP, Predicted Max < 50% of Allowable Cw - No
No value > Allowable Cw
Monitoring required
Acute: 22.4
Cyanide
NC
5 FW(7QlOs) 22
10
ug/L
3 1
15.0
Note: n < 9
C.V. (default)
Chronic: 5.1
All values < 10 considered compliant; no monitoring
Limited data set
No value > Allowable Cw
or limits required
Acute: NO WQS
Fluoride
NC
1800 FW(7Q10s)
ug/L
0 0
N/A
Chronic:-----1,838.7 -----------------------------
Acute: 171.649
Lead
NC
6.5760 FW(7QIOs) 168.5679
ug/L
26 0
0.250
Chronic: 6.717
No detects - no monitoring or limits required
NO DETECTS
Max MDL = 0.5
Acute: NO WQS
Mercury
NC
12 FW(7Q10s)
0.5
ng/L
0 0
N/A
---
-------------------------
Chronic:----- 12.3
Acute: NO WQS
Molybdenum
NC
2000 HH(7QlOs)
ug/L
26 7
12.8
Chronic: 2,043.0
No RP, Predicted Max < 50% of Allowable Cw - No
No value > Allowable Cw
Monitoring required
Acute (FW): 626.9
Nickel
NC
68.4385 FW(7Q10s) 615.6702
µg/L
28 28
9.7
Chronic (FW): 69.9
No RP, Predicted Max < 50% of Allowable Cw - No
No value > Allowable Cw ------------------------------
Monitoring required
Nickel
NC
25.0000 WS(7Q10s)
µg/L
Chronic (WS): 25.5
No value > Allowable Cw
Acute: 57.0
Selenium
NC
5 FW(7Q10s) 56
ug/L
28 0
0.5
_ _ _ _ _ _ _ _
Chronic: 5.1
_ _ _ _ _ _ _ _ _ _ _ _
No detects - no monitoring or limits required
NO DETECTS
Max MDL = 1
Acute: 1.039
Silver
NC
0.06 FW(7Q10s) 1.0202
ug/L
28 0
3.600
Chronic: 0.061
All data < 0.5 ug/L except for one value of 5.8 ug/L on
NO DETECTS
Max MDL = 5
6/7/2021
Acute: 235.3
Zinc
NC
233.1791 FW(7QIOs) 231.0957
ug/L
51 51
533.5
Chronic: 238.2
RP shown - apply Monthly Monitoring with Limit
8 values > Allowable Cw
Acute:
0 0
N/A
Acute:
0 0
N/A
Chronic:
20559 Freshwater RPA 2023, rpa
Page 3 of 3 10/13/2023

Permit No. NC0020559
NPDES Implementation of Instream Dissolved Metals Standards - Freshwater Standards
The NC 2007-2015 Water Quality Standard (WQS) Triennial Review was approved by the NC
Environmental Management Commission (EMC) on November 13, 2014. The US EPA subsequently
approved the WQS revisions on April 6, 2016, with some exceptions. Therefore, metal limits in draft
permits out to public notice after April 6, 2016 must be calculated to protect the new standards - as
approved.
Table 1. NC Dissolved Metals Water Q ality Standards/A uatic Life Protection
Parameter
Acute FW, µg/1
(Dissolved)
Chronic FW, µg/1
(Dissolved)
Acute SW, µg/1
(Dissolved)
Chronic SW, µg/1
(Dissolved)
Arsenic
340
150
69
36
Beryllium
65
6.5
---
---
Cadmium
Calculation
Calculation
40
8.8
Chromium III
Calculation
Calculation
---
---
Chromium VI
16
11
1100
50
Copper
Calculation
Calculation
4.8
3.1
Lead
Calculation
Calculation
210
8.1
Nickel
Calculation
Calculation
74
8.2
Silver
Calculation
0.06
1.9
0.1
Zinc
Calculation
Calculation
90
81
Table 1 Notes:
1. FW= Freshwater, SW= Saltwater
2. Calculation = Hardness dependent standard
3. Only the aquatic life standards listed above are expressed in dissolved form. Aquatic life
standards for Mercury and selenium are still expressed as Total Recoverable Metals due to
bioaccumulative concerns (as are all human health standards for all metals). It is still necessary
to evaluate total recoverable aquatic life and human health standards listed in 15A NCAC
213.0200 (e.g., arsenic at 10 µg/1 for human health protection; cyanide at 5 µg/L and fluoride at
1.8 mg/L for aquatic life protection).
Table 2. Dissolved Freshwater Standards for Hardness -Dependent Metals
The Water Effects Ratio (WER) is equal to one unless determined otherwise under 15A
NCAC 02B .0211 Subparagraph (11)(d)
Metal
NC Dissolved Standard, µg/I
Cadmium, Acute
WER*{1.136672-[1n hardness] (0. 04183 8)) • e^{0.9151 [In hardness]-3.1485)
Cadmium, Acute Trout waters
WER*{1.136672-[ln hardness](0.041838)} • e^{0.9151[ln hardness] -3.623 6)
Cadmium, Chronic
WER*{1.101672-[ln hardness](0.041838)} • e^{0.7998[ln hardness]-4A45l)
Chromium III, Acute
WER*0.316 e^{0.8190[ln hardness]+3.7256}
Chromium III, Chronic
WER*0.860 e^{0.8190[ln hardness]+0.6848}
Copper, Acute
WER*0.960 e^{0.9422[ln hardness]-1.700)
Copper, Chronic
WER*0.960 e^{0.8545[ln hardness]-1.702)
Lead, Acute
WER*{1.46203-[ln hardness](0.145712)) • e^{1.273[ln hardness]-1.460)
Lead, Chronic
WER*{1.46203-[ln hardness](0.145712)) • e^{1.273[ln hardness]-4.705)
Nickel, Acute
WER*0.998 e^{0.8460[ln hardness]+2.255)
Nickel, Chronic
WER*0.997 e^{0.8460[ln hardness]+0.0584)
Page 1 of 4

Permit No. NCO020559
Silver, Acute
WER*0.85 • eA0.72[ln hardness]-6.59}
Silver, Chronic
Not applicable
Zinc, Acute
WER*0.978 e^{0.8473[ln hardness]+0.884}
Zinc, Chronic
WER*0.986 e^{0.8473[ln hardness]+0.884}
General Information on the Reasonable Potential Analysis (RPA)
The RPA process itself did not change as the result of the new metals standards. However, application of
the dissolved and hardness -dependent standards requires additional consideration in order to establish the
numeric standard for each metal of concern of each individual discharge.
The hardness -based standards require some knowledge of the effluent and instream (upstream) hardness
and so must be calculated case -by -case for each discharge.
Metals limits must be expressed as `total recoverable' metals in accordance with 40 CFR 122.45(c). The
discharge -specific standards must be converted to the equivalent total values for use in the RPA
calculations. We will generally rely on default translator values developed for each metal (more on that
below), but it is also possible to consider case -specific translators developed in accordance with
established methodology.
RPA Permitting Guidance/WOBELs for Hardness -Dependent Metals - Freshwater
The RPA is designed to predict the maximum likely effluent concentrations for each metal of concern,
based on recent effluent data, and calculate the allowable effluent concentrations, based on applicable
standards and the critical low -flow values for the receiving stream.
If the maximum predicted value is greater than the maximum allowed value (chronic or acute), the
discharge has reasonable potential to exceed the standard, which warrants a permit limit in most cases. If
monitoring for a particular pollutant indicates that the pollutant is not present (i.e. consistently below
detection level), then the Division may remove the monitoring requirement in the reissued permit.
To perform a RPA on the Freshwater hardness -dependent metals the Permit Writer compiles the
following information:
• Critical low flow of the receiving stream, 7Q10 (the spreadsheet automatically calculates
the 1 Q 10 using the formula 1 Q 10 = 0.843 (s7Q 10, cfs) 0.993
• Effluent hardness and upstream hardness, site -specific data is preferred
• Permitted flow
• Receiving stream classification
2. In order to establish the numeric standard for each hardness -dependent metal of concern and for
each individual discharge, the Permit Writer must first determine what effluent and instream
(upstream) hardness values to use in the equations.
The permit writer reviews DMR's, Effluent Pollutant Scans, and Toxicity Test results for any
hardness data and contacts the Permittee to see if any additional data is available for instream
hardness values, upstream of the discharge.
If no hardness data is available, the permit writer may choose to do an initial evaluation using a
default hardness of 25 mg/L (CaCO3 or (Ca + Mg)). Minimum and maximum limits on the
hardness value used for water quality calculations are 25 mg/L and 400 mg/L, respectively.
If the use of a default hardness value results in a hardness -dependent metal showing reasonable
potential, the permit writer contacts the Permittee and requests 5 site -specific effluent and
upstream hardness samples over a period of one week. The RPA is rerun using the new data.
Page 2 of 4

Permit No. NCO020559
The overall hardness value used in the water quality calculations is calculated as follows:
Combined Hardness (chronic)
_ (Permitted Flow, cfs *Avfz. Effluent Hardness, mg/L)+s7Q10, cfs *Avg. Upstream Hardness, mg/L)
(Permitted Flow, cfs + s7Q 10, cfs)
The Combined Hardness for acute is the same but the calculation uses the 1 Q 10 flow.
3. The permit writer converts the numeric standard for each metal of concern to a total recoverable
metal, using the EPA Default Partition Coefficients (DPCs) or site -specific translators, if any
have been developed using federally approved methodology.
EPA default partition coefficients or the "Fraction Dissolved" converts the value for
dissolved metal at laboratory conditions to total recoverable metal at in -stream
ambient conditions. This factor is calculated using the linear partition coefficients
found in The Metals Translator: Guidance for Calculating a Total Recoverable
Permit Limit from a Dissolved Criterion (EPA 823-B-96-007, June 1996) and the
equation:
Cdiss = 1
Ctotal 1 + { [Kpo] [ss('+a)] [10-6] }
Where:
ss = in -stream suspended solids concentration [mg/1], minimum of 10 mg/L used,
and
Kpo and a = constants that express the equilibrium relationship between dissolved
and adsorbed forms of metals. A list of constants used for each hardness -dependent
metal can also be found in the RPA program under a sheet labeled DPCs.
4. The numeric standard for each metal of concern is divided by the default partition coefficient (or
site -specific translator) to obtain a Total Recoverable Metal at ambient conditions.
In some cases, where an EPA default partition coefficient translator does not exist (ie. silver), the
dissolved numeric standard for each metal of concern is divided by the EPA conversion factor to
obtain a Total Recoverable Metal at ambient conditions. This method presumes that the metal is
dissolved to the same extent as it was during EPA's criteria development for metals. For more
information on conversion factors see the June, 1996 EPA Translator Guidance Document.
5. The RPA spreadsheet uses a mass balance equation to determine the total allowable concentration
(permit limits) for each pollutant using the following equation:
Ca = (s7Q 10 + Qw) (Cwgs)(s7Q 10) (Cb)
Qw
Where: Ca = allowable effluent concentration (µg/L or mg/L)
Cwqs = NC Water Quality Standard or federal criteria (µg/L or mg/L)
Cb = background concentration: assume zero for all toxicants except NH3* (µg/L or mg/L)
Qw = permitted effluent flow (cfs, match s7Q 10)
s7Q 10 = summer low flow used to protect aquatic life from chronic toxicity and human
health through the consumption of water, fish, and shellfish from noncarcinogens (cfs)
* Discussions are on -going with EPA on how best to address background concentrations
Flows other than s7Q 10 may be incorporated as applicable:
1 Q 10 = used in the equation to protect aquatic life from acute toxicity
Page 3 of 4

Permit No. NC0020559
QA = used in the equation to protect human health through the consumption of water,
fish, and shellfish from carcinogens
30Q2 = used in the equation to protect aesthetic quality
6. The permit writer enters the most recent 2-3 years of effluent data for each pollutant of concern.
Data entered must have been taken within four and one-half years prior to the date of the permit
application (40 CFR 122.21). The RPA spreadsheet estimates the 95th percentile upper
concentration of each pollutant. The Predicted Max concentrations are compared to the Total
allowable concentrations to determine if a permit limit is necessary. If the predicted max exceeds
the acute or chronic Total allowable concentrations, the discharge is considered to show
reasonable potential to violate the water quality standard, and a permit limit (Total allowable
concentration) is included in the permit in accordance with the U.S. EPA Technical Support
Document for Water Quality -Based Toxics Control published in 1991.
7. When appropriate, permit writers develop facility specific compliance schedules in accordance
with the EPA Headquarters Memo dated May 10, 2007 from James Hanlon to Alexis Strauss on
40 CFR 122.47 Compliance Schedule Requirements.
The Total Chromium NC WQS was removed and replaced with trivalent chromium and
hexavalent chromium Water Quality Standards. As a cost savings measure, total chromium data
results may be used as a conservative surrogate in cases where there are no analytical results
based on chromium III or VI. In these cases, the projected maximum concentration (95th %) for
total chromium will be compared against water quality standards for chromium III and
chromium VI.
9. Effluent hardness sampling and instream hardness sampling, upstream of the discharge, are
inserted into all permits with facilities monitoring for hardness -dependent metals to ensure the
accuracy of the permit limits and to build a more robust hardness dataset.
10. Hardness and flow values used in the Reasonable Potential Analysis for this permit included:
Parameter
Value
Comments (Data Source)
Average Effluent Hardness, mg/L
51.00
Permittee submitted DMRs
(Total as CaCO3)
Average Upstream Hardness, mg/L
67.17
Permittee submitted DMRs
(Total as CaCO3)
7Q10 summer (cfs)
0.2
Reported in previous permit Fact
Sheet
1 Q 10 (cfs)
0.17
Calculated in RPA spreadsheet
Permitted Flow (MGD)
6.0
Design flow
Date: October 4, 2023
Permit Writer: Gary Perlmutter
Page 4 of 4

10/13/23 WQS = 12 ng/L
Facility Name
Henderson WRF / NC0020559
/Permit No.
Total Mercury 1631E PQL = 0.5 ng/L
Date Modifier Data Entry Value
MERCURY WQBEL/TBEL EVALUATION V:2013-6
No Limit Required
MMP Required
7Q10s = 0.200 cfs WQBEL = 12.37 ng/L
Permitted Flow = 4.140 47 ng/L
10/7/20
1.14
1.14
1.1 ng/L
- Annual Average for 2020
1/14/21
1.46
1.46
2/17/21
<
1
0.5
3/11/21
1.73
1.73
4/8/21
<
1
0.5
5/5/21
3.27
3.27
6/9/21
6.44
6.44
7/15/21
<
1
0.5
8/19/21
<
1
0.5
9/8/21
5.01
5.01
10/7/21
<
1
0.5
11/3/21
<
1
0.5
12/1/21
<
1
0.5
1.8 ng/L
- Annual Average for 2021
1/13/22
<
1
0.5
4/7/22
<
1
0.5
7/21/22
<
1
0.5
0.5 ng/L
- Annual Average for 2022
4/26/23
<
1
0.5
0.5 ng/L
- Annual Average for 2023

10/13/23 WQS = 12 ng/L
Facility Name
Henderson WRF / NC0020559
/Permit No.
Total Mercury 1631E PQL = 0.5 ng/L
Date Modifier Data Entry Value
MERCURY WQBEL/TBEL EVALUATION V:2013-6
No Limit Required
MMP Required
7Q10s = 0.200 cfs WQBEL = 12.26 ng/L
Permitted Flow = 6.000 47 ng/L
10/7/20
1.14
1.14
1.1 ng/L
- Annual Average for 2020
1/14/21
1.46
1.46
2/17/21
<
1
0.5
3/11/21
1.73
1.73
4/8/21
<
1
0.5
5/5/21
3.27
3.27
6/9/21
6.44
6.44
7/15/21
<
1
0.5
8/19/21
<
1
0.5
9/8/21
5.01
5.01
10/7/21
<
1
0.5
11/3/21
<
1
0.5
12/1/21
<
1
0.5
1.8 ng/L
- Annual Average for 2021
1/13/22
<
1
0.5
4/7/22
<
1
0.5
7/21/22
<
1
0.5
0.5 ng/L
- Annual Average for 2022
4/26/23
<
1
0.5
0.5 ng/L
- Annual Average for 2023