NC0025534_Final Fact Sheet_20171218

Fact Sheet
NPDES Permit No. NCO025534
Permit Writer/Email Contact: Gary Perlmutter, [e-mail]
Date: November 27, 2017
Division/Branch: NC Division of Water Resources/NPDES Complex Permitting
Fact Sheet Template: Version 09Jan2017
Permitting Action:
N Renewal
❑ Renewal with Expansion
❑ New Discharge
❑ Modification (Fact Sheet should be tailored to mod request)
Note: A complete application should include the following:
• For New Dischargers, EPA Form 2A or 2D requirements, Engineering Alternatives Analysis, Fee
• For Existing Dischargers (POTW), EPA Form 2A, 3 effluent pollutant scans, 4 21 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 Hendersonville WWTP
Applicant Address:
305 Williams Street, Hendersonville, NC 28792
Facility Address:
99 Balfour Road Hendersonville, NC 28792
Permitted Flow:
Phased 4.8 and 6.0 MGD
Facility Type/Waste:
MAJOR Municipal; 95% domestic, 5% industrial
Facility Class:
Class 4
Treatment Units:
Bar Screen, Gravity Thickener, Belt Press, Aerated Grit Removal,
Activated Sludge, Clarification, Low Head Filters, UV disinfection,
Cascade Aeration
Pretreatment Program (Y/N)
Yes
County:
Henderson
Region
Asheville
Briefly describe the proposed permitting action and facility background: The City of Hendersonville has
applied for NPDES permit renewal, and submitted a renewal application dated June 17, 2015. This facility
serves a population of 19,800 residents and operates a pretreatment program with 1 Significant Industrial
User (SIU) and 2 Categorical Industrial Users (CIUs).
Page 1 of 12

2. Receiving Waterbody Information:
Receiving Waterbody Information
Outfalls/Receiving Stream(s):
Outfall 001 -Mud Creek
Stream Segment:
6-55
Stream Classification:
C
Drainage Area (mi2):
98
Summer 7Q10 (cfs)
34.9
Winter 7Q10 (cfs):
46.8
30Q2 (cfs):
69.5
Average Flow (cfs):
186
IWC (% effluent):
17.6 and 21.1
303(d) listed/parameter:
This segment is listed as impaired for Benthos and Fish
Community on the Final 2014 and Draft 2016 303(d) lists.
Subject to TMDL/parameter:
Statewide TMDL for Mercury
Subbasin/HUC:
04-03-02; 06010105 Upper French Broad
USGS Topo Quad:
F9SW/Hendersonville, NC
3. Effluent Data Summary
Effluent data is summarized below for the period January 2013 through February 2017.
Table. Effluent Data Summary
Parameter
Units
Average
Max
Min
Limit 1
Flow
MGD
3.10
9.99
1.99
4.80
BODS summer
mg/L
4.3
17.5
< 2
MA= 10.0
WA = 15.0
BODS winter
mg/L
4.5
15.5
< 2
MA = 20.0
WA = 30.0
BOD removal
%
97.3
NA
NA
> 85
Total Suspended Solids
mg/L
4.2
28.8
< 2.5
MA = 30.0
(TSS)
WA = 45.0
TSS removal
%
98.5
NA
NA
> 85
NH3N summer
mg/L
0.54
6.90
< 0.50
MA = 2.0
WA = 6.0
NH3N winter
mg/L
0.55
4.40
< 0.50
MA = 4.0
WA = 12.0
Dissolved Oxygen (DO)
mg/L
7.3
9.8
5.0
>_ 5.0
Fecal Coliform
#/100 mL
6.5
600
< 1
MA = 200
(geometric mean)
WA = 400
Page 2 of 12

Total Residual Chlorine
µgm
NA?
NAZ
NMDM
= 28
(TRC)
Temperature
°C
17.6
25.1
6.0
Monitor
only
pH
SU
6.8
7.3
5.9
6-9
Total Nitrogen
mg/L
9.55
19.10
4.30
Monitor
only
Total Phosphorus
mg/L
2.70
4.40
1.10
Monitor
only
Chronic Toxicity
Ceriodaphnia
pass
pass
pass
Pass
Bis(2-ethylhexyl)phthalate
gg/L
< 5
< 5
< 5
Monitor
only
Total Copper
µg/L
15.8
86.0
7.0
Monitor
only
Total Zinc
µg2
47.2
85.3
0.04
Monitor
only
Total Nickel
µg/L
11.3
107.0
< 5.0
MA = 142
WA = 1268
1MA-Monthly Average, WA -Weekly Average, DM -Daily Maximum.
2Facility is using UV for disinfection, not chlorine.
4. Instream Data Summary
Instream monitoring may be required in certain situations, for example: 1) to verify model predictions when
model results for instream DO are within 1 mg/L of instream standard at full permitted flow; 2) to verify
model predictions for outfall diffuser; 3) to provide data for future TMDL; 4) based on other instream
concerns. Instream monitoring may be conducted by the Permittee, and there are also Monitoring Coalitions
established in several basins that conduct instream sampling for the Permittee (in which case instream
monitoring is waived in the permit as long as coalition membership is maintained).
If applicable, summarize any instream data and what instream monitoring will beproposedfor this permit
action: The current permit requires instream monitoring for DO, Fecal Coliform and Temperature. Review
of instream data from February 2014 through February 2017 yielded an average upstream to downstream
DO increase of 0.4 mg/L with no downstream DO daily values below the daily average standard of 5 mg/L
for Class C waters. A pairwise t-test of upstream and downstream DO data found no significant differences
between the two locations. Further, no effluent DO values were less than 5.0 mg/L during the instream
review period. Therefore, it appears that the WWTP effluent has not impacted the receiving water in terms
of DO.
Temperatures decreased on average 0.2°C from upstream to downstream sites with a maximum increase of
2.7°C, below the standard of 2.8°C increase above the natural water temperature. The maximum
downstream temperature was 24.7°C, below the standard of 29°C for mountain and upper piedmont waters.
A pairwise t-test of upstream and downstream temperature data found no significant differences between
the two locations. Further, no effluent temperature values were above 29°C during the instream review
period. Therefore, it appears that the WWTP effluent has not impacted the receiving water in terms of
temperature.
Page 3 of 12

Fecal Coliform values varied greatly, with geometric means of 349/100 mL upstream and 219/100 mL
downstream. The facility has reported no effluent fecal coliform limit exceedences over the instream
monitoring period, and the geometric mean of effluent coliform counts over this period was 9/100 mL. The
receiving stream, Mud Creek, is impaired for benthos and fish community, which may be related to instream
coliform levels. The reported instream coliform levels appear to be unrelated to effluent input.
Mud Creek is a Class C waterbody, and while it is not impaired for coliform per se, reported high levels of
coliform may be contributing to the impairment. It is recommended that instream monitoring for
Temperature, DO, and Fecal Coliform be maintained, however, removal of Fecal Coliform sampling should
be considered at the next renewal.
Is this facility a member of a Monitoring Coalition with waived instream monitoring (Y/119: NO
Name of Monitoring Coalition: NA
5. Compliance Summary
Summarize the compliance record with permit effluent limits (past 5 years): The facility reported one limit
violation in the past five years. A pH of 5.9 (limit: 6-9) was reported on January 9, 2017. No action was
taken.
Summarize the compliance record with aquatic toxicity test limits and any second species test results (past
5 years): The facility passed 19 of 19 quarterly chronic Ceriodaphnia dubia toxicity tests, as well as all 4
second species (Fathead Minnow) chronic toxicity tests, sampled on 11/06/2016, 12/4/2016, 01/03/2017
and 02/12/2017.
Summarize the results from the most recent compliance inspection: The most recent facility inspection was
conducted on February 22, 2017. The inspector reported that the facility appeared to be well maintained
and operated, and in compliance with its permit.
6. Water Quality -Based Effluent Limitations (WQBELs)
Dilution and Mixing Zones
In accordance with 15A NCAC 2B.0206, the following streamflows are used for dilution considerations
for development of WQBELs: 1 Q 10 streamflow (acute Aquatic Life); 7Q 10 streamflow (chronic Aquatic
Life; non -carcinogen HH); 30Q2 streamflow (aesthetics); annual average flow (carcinogen, W.
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 15,4 NCAC 2B. 0204(b): NA
Oxygen -Consuming Waste Limitations
Limitations for oxygen -consuming waste (e.g., BOD) are generally based on water quality modeling to
ensure protection of the instream dissolved oxygen (DO) water quality standard. Secondary TBEL limits
(e.g., BOD= 30 mg/L for Municipals) may be appropriate if deemed more stringent based on dilution and
model results.
Ifpermit limits are more stringent than TBELs, describe how limits were developed: Limitations for BOD
are based on a Streeter Phelps model (Level B) for instream DO protection. No changes are proposed from
the previous permit limits.
Page 4 of 12

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 µg2) and capped at 28 pg/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: The facility does
not chlorinate; therefore, the current TRC limit and monitoring requirement will be removed from the
permit. The current NH3-N limits (originally set as oxygen -consuming limits) are more stringent than those
calculated using the WLA spreadsheet.
Reasonable Potential Analysis (RPA) for Toxicants
If applicable, conduct RPA analysis and complete information below.
The need for toxicant limits is based upon a demonstration of reasonable potential to exceed water quality
standards, a statistical evaluation that is conducted during every permit renewal utilizing the most recent
effluent data for each outfall. The RPA is conducted in accordance with 40 CFR 122.44 (d) (i). The NC
RPA procedure utilizes the following: 1) 95% Confidence Level/95% Probability; 2) assumption of zero
background; 3) use of '/2 detection limit for "less than" values; and 4) streamflows used for dilution
consideration based on 15A NCAC 2B.0206. Effective April 6, 2016, NC began implementation of
dissolved metals criteria in the RPA process in accordance with guidance titled NPDES Implementation of
Instream Dissolved Metals Standards, dated June 10, 2016.
A reasonable potential analysis was conducted on effluent toxicant data collected between January 2013
and January 2017. 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 Monitorin. The following parameters will receive a water quality -based
effluent limit (WQBEL) since they demonstrated a reasonable potential to exceed applicable water
quality standards/criteria: Copper at 6.0 MGD permitted flow.
• Monitoring Only. The following parameters will receive a monitor -only requirement since they
did not demonstrate reasonable potential to exceed applicable water quality standards/criteria, but
the maximum predicted concentration was > 50% of the allowable concentration: Copper (at 4.8
MGD only), Nickel and Silver. All silver effluent samples were reported as non -detects at < S
,ug/L. Since the allowable discharge concentration is < 1 yg/L, monitoring is recommended at a
lower detection level of < l ,ug/L.
• 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 Phenolic Compounds, Total Chromium, Cyanide, Lead, Selenium,
Zinc.
• POTW Effluent Pollutant Scan Review: Three effluent pollutant scans were evaluated for
additional pollutants of concern.
o The following parameter(s) will receive a water quality -based effluent limit (WQBEL)
with monitoring, since as part of a limited data set, two samples exceeded the allowable
discharge concentration: None.
o The following parameter(s) will receive a monitor -only requirement, since as part of a
limited data set, one sample exceeded the allowable discharge concentration: None.
Page 5 of 12

If applicable, attach a spreadsheet of the RPA results as well as a copy of the Dissolved Metals
Implementation Fact Sheet for freshwater/saltwater to this Fact Sheet. Include a printout of the RPA
Dissolved to Total Metal Calculator sheet if this is a Municipality with a Pretreatment Program.
Toxicity Testing Limitations
Permit limits and monitoring requirements for Whole Effluent Toxicity (WET) have been established in
accordance with Division guidance (per WET Memo, 8/2/1999). Per WET guidance, all NPDES permits
issued to Major facilities or any facility discharging "complex" wastewater (contains anything other than
domestic waste) will contain appropriate WET limits and monitoring requirements, with several exceptions.
The State has received prior EPA approval to use an Alternative WET Test Procedure in NPDES permits,
using single concentration screening tests, with multiple dilution follow-up upon a test failure.
Describe proposed toxicity test requirement: Hendersonville WWTP is a Major POTW with chronic WET
limits of 18% effluent at 4.8 MGD and 21% at 6.0 MGD upon expansion. No changes are proposed.
Mercury Statewide TMDL Evaluation
There is a statewide TMDL for mercury approved by EPA in 2012. The TMDL target was to comply with
EPA's mercury fish tissue criteria (0.3 mg/kg) for human health protection. The TMDL established a
wasteload allocation for point sources of 37 kg/year (81 lb/year), and is applicable to municipals and
industrial facilities with known mercury discharges. Given the small contribution of mercury from point
sources (-2% of total load), the TMDL emphasizes mercury minimization plans (MMPs) for point source
control. Municipal facilities > 2 MGD and discharging quantifiable levels of mercury (> 1 ng/L) will receive
an MMP requirement. Industrials are evaluated on a case-by-case basis, depending if mercury is a pollutant
of concern. Effluent limits may also be added if annual average effluent concentrations exceed the WQBEL
value (based on the NC WQS of 12 ng/L) and/or if any individual value exceeds a TBEL value of 47 ng/L.
Table. Mercury Effluent Data Summary
Parameter
2012
2013
2014
2015
2016
No. of Samples
5
4
4
5
3
Annual Average Cone. ng/L
1.6
1.0
6.1
2.3
2.1
Maximum Cone., ng/L
2.32
1 1.38
20.50
4.10
3.07
TBEL, ng/L
47
WQBEL, ng/L
68.3
Describe proposed permit actions based on mercury evaluation: Since no annual average mercury
concentration exceeded the WQBEL, and no individual mercury sample exceeded the TBEL, no mercury
limit is required. However, since the facility is > 2 MGD and reported quantifiable levels of mercury (> 1
ng/L), a Mercury Minimization Plan (MMP) has been added to the permit.
Other TMDL/Nutrient Management Strategy Considerations
If applicable, describe any other TMDLs/Nutrient Management Strategies and their implementation within
this permit: The French Broad River Basin has no TMDLs, nor does it have a Nutrient Management
Strategy. Total Nitrogen and Total Phosphorus is monitored quarterly per facility size (> 1 MGD) and river
sub -basin (French Broad) as specified in 15A NCAC 02B .0508. No changes are proposed.
Other WQBEL Considerations
Ifapplicable, describe any otherparameters of concern evaluatedfor WQBELs: The current permit requires
quarterly monitoring of Bis(2-ethylhexyl)phthalate, based on detects in prior Effluent Scans. All data under
Page 6 of 12

the current permit were below detection at 5 µg/L; the Permittee requested this be removed from the permit.
Review of the data revealed that continued monitoring is no longer necessary as all reported data were
below detection limit of 5 µg/L, which is also the North Carolina protective value for surface waters.
Therefore, quarterly monitoring of Bis(2-ethylhexyl)phthalate will be removed from the permit.
If applicable, describe any special actions (HQW or OR W) this receiving stream and classification shall
comply with in order to protect the designated waterbody: NA
If applicable, describe any compliance schedules proposed for this permit renewal in accordance with 15A
NCAC 2H. 0107(c)(2)(B), 40CFR 122.47, and EPA May 2007 Memo: NA
If applicable, describe any water quality standards variances proposed in accordance with NCGS 143-
215.3(e) and 15A NCAC 2B.0226 for this permit renewal: NA
7. Technology -Based Effluent Limitations (TBELs)
Municipals (if not applicable, delete and skip to Industrials)
Are concentration limits in the permit at least as stringent as secondary treatment requirements (30 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 BOD51TSS included in the permit? YES
If NO, provide a justification (e.g., waste stabilization pond). NA
Industrials (if not applicable, delete and skip to next Section). 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 EngineeringAlternatives
Analysis (EAA) and any water quality modeling results: NA
9. Antibacksliding Review:
Sections 402(0)(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).
Page 7 of 12

Are any effluent limitations less stringent than previous permit (YES/NO): NO
If YES, confirm that antibacksliding provisions are not violated: NA
10. Monitoring Requirements
Monitoring frequencies for NPDES permitting are established in accordance with the following regulations
and guidance: 1) State Regulation for Surface Water Monitoring, 15A NCAC 2B.0500; 2) NPDES
Guidance, Monitoring Frequency for Toxic Substances (7/15/2010 Memo); 3) NPDES Guidance, Reduced
Monitoring Frequencies for Facilities with Superior Compliance (10/22/2012 Memo); 4) Best Professional
Judgement (BPJ). Per US EPA (Interim Guidance, 1996), monitoring requirements are not considered
effluent limitations under Section 402(0) of the Clean Water Act, and therefore anti -backsliding
prohibitions would not be triggered by reductions in monitoring frequencies.
For instream monitoring, refer to Section 4.
11. Electronic Reporting Requirements
The US EPA NPDES Electronic Reporting Rule was fmalized on December 21, 2015. Effective December
21, 2016, NPDES regulated facilities are required to submit Discharge Monitoring Reports (DMRs)
electronically. Effective December 21, 2020, NPDES regulated facilities will be required to submit
additional NPDES reports electronically. This permit contains the requirements for electronic reporting,
consistent with Federal requirements.
12. Summary of Proposed Permitting Actions
Table 1. Current Permit Conditions and Proposed Changes until expansion above 4.8 MGD.
Parameter
Current Permit
Proposed Change
Basis for Condition/Change
Flow
MA 4.8 MGD
No change
15A NCAC 2B .0505.
Summer:
MA 10 mg/L
WQBEL. Based on protection of
BODS
WA 15 mg/L
No chaneDO
g
standard. 15A NCAC 2B.0200,
Winter:
assigned upon facility expansion of
MA 20 mg/L
4.8 MGD in 2002.
WA 30 mg/L
Total Suspended Solids
MA 30 mg/L
TBEL. Secondary treatment
(TSS)
WA 45 mg/L
No change
standards/40 CFR 133 / 15A NCAC
2B .0406.
Summer:
MA 2 mg/L
WQBEL. Based on protection of
NH3-N
WA 6 mg/L
No change
DO standard. 15A NCAC 2B.0200,
Winter:
assigned upon facility expansion of
MA 4 mg/L
4.8 MGD in 2002.
WA 12 mg/L
Dissolved Oxygen (DO)
> 5 mg/L
No change
WQBEL. State WQ standard, 15A
NCAC 2B.0200.
Page 8 of 12

Fecal Coliform
MA 200 /100 mL
No change
WQBEL. State WQ standard, 15A
(geometric mean)
WA 400 /100 mL
NCAC 2B.0200.
Total Residual Chlorine
DM 28 gg/L
Removed
Facility does not chlorinate.
(TRC)
Temperature
Monitor daily
No Change
WQBEL. State WQ standard, 15A
NCAC 2B.0500.
pH
6-9 SU
No change
WQBEL. State WQ standard, 15A
NCAC 2B.0200.
Total Nitrogen
(NO2 + NO3 + TKN)
Monitor quarterly
No change
15A NCAC 02B .0508.
Total Phosphorus
Monitor quarterly
No change
15A NCAC 02B .0508.
Ceriodaphnia
WQBEL. No toxics in toxic
Chronic Toxicity
pass/fail at 18%
No change
amounts. 15A NCAC 2B.0200 and
effluent
15A NCAC 2B.0500.
Bis(2-ethylhexyl)phthalate
Monitor quarterly
Removed
No detects at 5 gg/L in DMR data.
Hardness -dependent dissolved
metals water quality standards,
Total Hardness
No requirement
Monitor quarterly
approved in 2016, need effluent and
instream hardness data for
calculations of permit limitations.
No reasonable potential found;
Total Copper
Monitor quarterly
No change
predicted maximum > 50% of
allowable Cw.
MA = 142 gg/L
Removed limits;
reduced
No reasonable potential found;
Total Nickel
DM = 1268 gg/L
monitoring to
predicted maximum > 50% of
Monitor monthly
quarterly
allowable Cw.
Added quarterly
No detects at < 5her than
g�L higher
Total Silver
No requirement
monitoring at
allowable Cw.
lower PQL
No reasonable potential found;
Total Zinc
Monitor quarterly
Removed
predicted maximum < 50% of
allowable Cw.
WQBEL. In accordance with 2012
Mercury Minimization
No requirement
Added MMP
Statewide Mercury TMDL
Plan (MMP)
Special Condition
Implementation, per facility size and
monitoring data criteria.
Reduced to three
Effluent Pollutant Scan
Annual
times per permit
40 CFR 122.
cycle
DO
Instream
monitoring
No change
15A NCAC 02B.0508.
Temperature
Instream
No change
15A NCAC 02B .0508.
monitoring
Fecal Coliform
Instream
monitoring
No change
15A NCAC 02B.0508.
Page 9of12

Electronic Reporting
No requirement
Added Electronic
Reporting Special
In accordance with EPA Electronic
Flow
MA 6.0 MGD
Condition
Reporting Rule 2015.
MGD — Million gallons per day, MA - Monthly Average, WA — Weekly Average, DM — Daily Max
Table 2. Current Permit Conditions and Proposed Changes upon expansion above 4.8 MGD.
Parameter
Current Permit
Proposed Change
Basis for Condition/Change
Flow
MA 6.0 MGD
No change
15A NCAC 2B .0505
Summer:
MA 10 mg/L
WQBEL. Based on protection of
BODS
WA 15 mg/L
No change
DO standard. 15A NCAC 2B.0200,
Winter:
assigned upon facility expansion of
MA 20 mg/L
4.8 MGD in 2002.
WA 30 mg/L
Total Suspended Solids
MA 30 mg/L
TBEL. Secondary treatment
(TSS)
WA 45 mg/L
No change
standards/40 CFR 133 / 15A NCAC
2B .0406.
Summer:
MA 2 mg/L
WQBEL. Based on protection of
NH3-N
WA 6 mg/L
No change
DO standard. 15A NCAC 2B.0200,
Winter:
assigned upon facility expansion of
MA 4 mg/L
4.8 MGD in 2002.
WA 12 mg/L
Dissolved Oxygen (DO)
> 5 mg/L
No change
WQBEL. State WQ standard, 15A
—
NCAC 2B.0200.
Fecal Coliform
MA 200 /100 mL
No change
WQBEL. State WQ standard, 15A
(geometric mean)
WA 400 /100 mL
NCAC 2B .0200.
Total Residual Chlorine
DM 28 µg/L
Removed
Facility does not chlorinate.
(TRC)
Temperature
Monitor daily
No Change
WQBEL. State WQ standard, 15A
NCAC 2B.0500.
pH
6-9 SU
No change
WQBEL. State WQ standard, 15A
NCAC 2B.0200.
Total Nitrogen
(NO2 + NO3 + TKN)
Monitor quarterly
No change
15A NCAC 02B .0508.
Total Phosphorus
Monitor quarterly
No change
15A NCAC 02B.0508.
Ceriodaphnia
WQBEL. No toxics in toxic
Chronic Toxicity
pass/fail at 21 %
No change
amounts. 15A NCAC 2B.0200 and
effluent
15A NCAC 2B.0500.
Bis(2-ethylhexyl)phthalate
Monitor quarterly
Removed
No detects at 5 gg/L in DMR data.
Hardness -dependent dissolved
Total Hardness
No requirement
Monitor quarterly
metals water quality standards,
approved in 2016, need effluent and
Page 10 of 12

MGD — Million gallons per day, MA - Monthly Average, WA — Weekly Average, DM — Daily Max
13. Public Notice Schedule:
Permit to Public Notice: 07/12/2017
Per 15A NCAC 211.0109 &.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. 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:
Page 11 of 12
instream hardness data for
calculations of permit limitations.
Total Copper
Monitor quarterly
MA = 37.5 pg/L
WA = 42.8 gg/L
Reasonable potential found.
MA= 119 gg/L
Removed limits;
No reasonable potential found;
Total Nickel
DM = 1067 µg/L
reduced monitoring
predicted maximum > 50% of
Monitor monthly
to quarterly
allowable Cw.
Total Silver
No requirement
Added quarterly
monitoring at lower
No detects at < 5 µg/L, higher than
limit
allowable Cw.
No reasonable potential found;
Total Zinc
Monitor quarterly
Removed
predicted maximum < 50% of
allowable Cw.
WQBEL. In accordance with 2012
Mercury Minimization
No requirement
Added MMP Special
Statewide Mercury TMDL
Plan (MMP)
Condition
Implementation, per facility size and
monitoring data criteria.
Reduced to three
Effluent Pollutant Scan
Annual
times per permit
40 CFR 122
cycle
DO
Instream
monitoring
No change
15A NCAC 02B .0508.
Temperature
Instream
No change
15A NCAC 02B.0508.
monitoring
Fecal Coliform
Instream
monitoring
No change
15A NCAC 02B.0508.
Electronic Reporting
No requirement
Added Electronic
Reporting Special
In accordance with EPA Electronic
Condition
Reporting Rule 2015.
MGD — Million gallons per day, MA - Monthly Average, WA — Weekly Average, DM — Daily Max
13. Public Notice Schedule:
Permit to Public Notice: 07/12/2017
Per 15A NCAC 211.0109 &.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. 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:
Page 11 of 12

15. Fact Sheet Attachments (if applicable):
• NPDES Aquifer Protection Permitting Unit Pretreatment Information Request Form
• Draft 2016 Category 5 Assessments EPA Submittal — 303(d) List, page 44
• Final 2014 NC 303(d) list, page 31
• Instream Monitoring data, summary tables and charts
• Removal Rate Calculations
• Monitoring Reports: violations
• WET Testing and Self Monitoring Summary, page 53
• Compliance Evaluation report, 2/22/2017
• NH3/TRC WLA Calculations sheet
• RPA Spreadsheet Summary for current 4.8 MGD and 6.0 MGD expansion
• Dissolved Metals huplementation/Freshwater
• Mercury Data Statistics sheet
Page 12 of 12

NPDES/Aquifer Protection Perm
PERMIT WRITER COMPLETES THIS PART:
Unit Pretreatment Information Request Form
Check
Date of Request 10/27/2016
municipal renewal x
Re uestor Claire WelliM
new industries j
Facility Name Hendersonville
WWTP expansion
Permit Number NCO025534
Speculative limits
Region Asheville
stream reclass.
Basinj French Broad
outfall relocation
Next cle:
7010 change
other
other
check applicable PERCS staff:
X JBRD. CPF, CTB, FRB. TAR - Sarah Bass
'HO, HIW, LTN, LUM, NES, NEW, ROA, YAD
- Monit Hassan (807-6314)
PERMIT WRITERS - AFTER you not this form back
from PERCS:
- Notify PERCS if LTMP/STMP data we said should bl
on DMRs is not really there, so we can get it for you
(or NOV POTW).
- Notify PERCS if you want us to keep a specific POC
in LTMP/STMP so you will have data for next permit
renewal.
Email PERCS draft permit, fact sheet, RPA.
Send PERCS paper copy of permit (w/o NPDES
boilerplate), cover letter, final fact sheet. Email RPA H
-hanges.
PERCS
Status
PRETREATMENT STAFF COMPLETES THIS PART:
of Pretreatment Program (check all that apply)
1) facility has no SIU's, does have Division approved Pretreatment Program that is INACTIVE
2) facility has no SIU's, does not have Division approved Pretreatment Program
3) facility has SIUs and DWQ approved Pretreatment Program (list "DEV'if program still under development)
3a) Full Program with LTMP
3b) Modified Program with STMP
4) additional conditions regarding Pretreatment attached or listed below
Flow, MGDj Permitted Actual Time period for Actual STMP time frame:
Is all data on DMRs?
Lead
v Q
YES
v
Industrial: 0.33 0.1543 Jan 2010- Dec 2012
Most recent:
NO attach data
Uncontrollable, n/a 2.2811 Jan 2010- Dec 2012
Next cle:
Mickel Q
a
d Parameter of Required POTW POC
C Concern (POC) POC due to NPDES/ Non- Required by by 503 POC due
C m Disch Permit Limit EPA* to SIU_ (Explain
Check List Sludge'" below)—
STMP LTMP
Effluent Effluent
Freq Freq
Q = Quarterly
M = Monthly
BOD 0
TSS Q
NH3 0
Arsenic 0
Cadmium O
Chromium Q
Copper v' Q
d Cyanide
Is all data on DMRs?
Lead
v Q
YES
v
Mercury
Q
NO attach data
Molybdenum
Q
Mickel Q
Silver Q
Selenium Q
Zinc
Q
Is data in spreadsheet.
Total Nitrogen
Q
YES email to writer
Phosphorus
Q
NO
*Always in the LTMP/STMP ** Only in LTMP/STMP if sludge land app or composte (dif POCs for incinerators)
*** Only in LTMP/STMP while SIU still discharges to POTW **** Only in LTMP/STMP when pollutant is still of concern to POTW
so no 503 sludge pollutants of concern required.
NC0025534- Hendersonville- PERC NPDES_Pretreatment.request.form.may2016
Revised: July 24, 2007

K�Draft 2016 Category 5 Assessments EPA Submittal -303(d) List
Ealft"MMW French Broad River Subbasin French Broad River Basin
Qw- UY
Mud Creek From State Route 1125 to Little Mud Creek
6-55b
C 1.9
FW Miles
Assessment Criteria Status
Reason for Rating
ILParameter of Interest
Exceeding Criteria
Fair
Benthos (Nar, AL, FW)
5
.......
Exceeding Criteria
Poor
Fish Community (Nar, AL, FW)
I5
Mud Creek
From Little Mud Creek to Clear Creek Byers Creek
6-55c1
C 7.4
FW Miles
Assessment Criteria Status
Reason for Rating
Parameter of Interest
Category
-
Exceeding Criteria
--.. ......
I ,Fair ....
—_ . ...._ ...---- —....
Benthos (Nar, AL, FW)
..._ - --- - --
5
- -
�Exceeding Criteria
Fair
Fish Community (Nar, AL, FW)
5
Mud Creek
From Clear Creek to Byers Creek
6-55c2
C 3.6
FW Miles
Assessment Criteria Status
Reason for Rating. _ Parameter of Interest
Category
(Exceeding Criteria
Fair
_Benthos (Nar, AL, FW)
5
Exceeding Criteria
Fair
Fish Community (Nar, AL, FW)
5
Newfound Creek From source to SR 1296
6-84a C 3.9 FW Miles
Assessment Criteria Status
Exceeding Criteria
Newfound Creek
6-84b
Reason for Rating
Fair
Assessment Criteria Status Reason for Rating
Exceeding Criteria Fair
Parameter of Interest
;Benthos (Nar, AL, FW)
From State Route 1296 to SR 1297
C
Parameter of Interest
...... .... .....
Benthos (Nar, AL, FW)
t-azegory
5
1.3 FW Miles
..
Category
5
6/6/2016 Draft 2016 NC Category 5 Assessments- EPA Submittal Page 44 of 209

French Broad River Basin
?014 AU Number. 1AU Name: AU Length Area: AU Units: I Classification:
AU Description:
6-96-10b Little Ivy Creek (River) 2.1 FW Miles WS-II;HQW
From State Route 1547 to Ivy Creek
IRCategory: ACS: Parameter Of Interest: Collection Year: 303(d) yr:
5 EC Fecal Coliform (GM 200/400 5 in 30, REC, FW) 2011 2014
6-96-10a
Little Ivy Creek (River)
2.6 FW Miles WS-II;HQW
From California Creek to State Route 1547
303(d) yr:
5
IRCategory:
ACS: Parameter Of Interest:
Collection Year:
303(d) yr:
5
EC Fecal Coliform (GM 200/400 5 in 30, REC, FW)
2011
2014
6-54-(1)b
Mills River
1.8 FW Miles WS-II;Tr,HQW
From River Mile 1.03 to a point 0.5 mile upstream of N.C. Hwy. 191
IRCategory:
ACS: Parameter Of Interest:
Collection Year:
303(d) yr:
5
EC pH (6 su, AL, FW)
2012
2012
6-55c1
Mud Creek
7.4 FW Miles C
From Little
Mud Creek to Clear Creek Byers Creek
IRCategory:
ACS: Parameter Of Interest:
Collection Year:
303(d) yr:
5
EC Benthos Fair (Nar, AL, FW)
2000
2006
S
EC Fish Community Fair (Nar, AL, FW)
2002
2006
6-55b Mud Creek 1.9 FW Miles C
From State Route 1125 to Little Mud Creek
IRCategory: ACS: Parameter Of Interest: Collection Year: 303(d) yr:
5 EC Benthos Fair (Nar, AL, FW) 2007 1998
5 EC Fish Community Poor (Nar, AL, FW) 2002 1998
6-55c2 Mud Creek 3.6 FW Miles C
From Clear Creek to Byers Creek
(IRCategory: ACS: Parameter Of Interest: Collection Year: 303(d) yr:
5 EC Fish Community Fair (Nar, AL, FW) 2002 2006
5 EC Benthos Fair (Nar, AL, FW) 2000 2006
6-84e Newfound Creek 1.7 FW Miles C
From Dix Creek to French Broad River
IRCategory:
ACS:
Parameter Of Interest:
Collection Year:
303(d) yr:
5
EC
Fish Community Fair (Nar, AL, FW)
2012
2014
5
EC
Benthos Fair (Nar, AL, FW)
2012
2014
2014 NC 303(d) List -Category 5 Final December 19, 2014 Page 31 of 149

Hendersonville WWTP Instream Monitoring NCO025534
Tem °C
Date
Upstream
Dnstream Diff.
2/3/2014
9.1
8.6
-0.5
2/10/2014
6.3
6.9
0.6
2/17/2014
5.2
5.6
0.4
2/24/2014
8.9
8.7
-0.2
3/4/2014
7.3
6.9
-0.4
3/10/2014
8.5
9.0
0.5
3/18/2014
6.7
6.3
-0.4
3/24/2014
8.2
7.9
-0.3
3/31/2014
10.1
8.9
-1.2
4/8/2014
10.3
10.4
0.1
4/14/2014
15.3
16.1
0.8
4/21/2014
11.7
11.8
0.1
4/28/2014
16.9
16.8
-0.1
5/5/2014
16.1
15.8
-0.3
5/12/2014
18.0
17.8
-0.2
5/19/2014
13.2
13.0
-0.2
5/28/2014
18.1
18.1
0.0
6/2/2014
17.7
17.3
-0.4
6/3/2014
17.8
17.6
-0.2
6/5/2014
20.7
20.4
-0.3
6/9/2014
20.7
20.6
-0.1
6/10/2014
20.8
20.0
-0.8
6/11/2014
20.8
20.5
-0.3
6/16/2014
21.0
20.3
-0.7
6/18/2014
21.4
20.8
-0.6
6/19/2014
20.9
20.5
-0.4
6/24/2014
21.4
21.0
-0.4
6/25/2014
21.2
21.0
-0.2
6/-26/2014
22.0
20.8
-1-2
6/30/2014
21.2
20.6
-0.6
- 7/1/2014
21.5
20.9
-0.6
7/2/2014
22.4
21.9
-0.5
7/7/2014
20.0
19.1
-0.9
7/8/2014
20.7
20.0
-0.7
7/9/2014
20.9
20.9
0.0
7/14/2014
21.7
21.4
-0.3
7/15/2014
22.0
21.4
-0.6
7/16/2014
20.9
20.8
-0.1
7/21/2014
20.0
19.5
-0.5
7/22/2014
20.0
19.5
-0.5
7/23/2014
20.6
20.2
-0.4
7/28/2014
21.2
20.7
-0.5
8/4/2014
21.0
20.5
-0.5
8/5/2014
20.8
20.0
-0.8
8/6/2014
20.7
20.1
-0.6
Page 1 of 14
GB Perlmutter, rev. 11/21/2017
Fecal Coliform
(#/100)
Date
Upstream
Dnstream
Diff.
2/3/2014
340
227
113.0
2/10/2014
243
136
107.0
2/17/2014
195
158
37.0
2/24/2014
97
220
-123.0
3/4/2014
72
192
-120.0
3/10/2014
52
70
-18.0
3/18/2014
220
200
20.0
3/24/2014
22
84
-62.0
3/31/2014
22
82
-60.0
4/8/2014
273
734
-461.0
4/14/2014
190
76
114.0
4/21/2014
160
132
28.0
4/28/2014
200
86
114.0
5/5/2014
232
212
20.0
5/12/2014
220
208
12.0
5/19/2014
530
218
312.0
5/28/2014
430
1900
-1470.0
6/2/2014
340
350
-10.0
6/3/2014
500
270
230.0
6/5/2014
340
185
155.0
6/9/2014
350
196
154.0
6/10/2014
310
232
78.0
6/11/2014
422
178
244.0
6/16/2014
410
340
70.0
6/18/2014
310
500
-190.0
6/19/2014
475
204
271.0
6/24/2014
440
200
240.0
6/25/2014
540
218
322.0
6/26/2014
240
-2-04
36.0 -
6/30/2014
2400 >
9400
-7000.0
- 7/1/2014
1040
2500
-146"---
7/2/2014
595
445
150.0
7/7/2014
320
742
-422.0
7/8/2014
630
116
514.0
7/9/2014
590
450
140.0
7/14/2014
550
340
210.0
7/15/2014
360
410
-50.0
7/16/2014
400 >
760
-360.0
7/21/2014
410
156
254.0
7/22/2014
525
780
-255.0
7/23/2014
535
233
302.0
7/28/2014
920
660
260.0
8/4/2014
880
620
260.0
8/5/2014
840
1040
-200.0
8/6/2014
920
172
748.0
Page 1 of 14
GB Perlmutter, rev. 11/21/2017

Hendersonville WWTP Instream Monitoring NCO025534
Tem °C
Date
Upstream
Dnstream Diff.
8/11/2014
20.2
19.4
-0.8
8/12/2014
21.2
20.4
-0.8
8/13/2014
20.7
20.5
-0.2
8/18/2014
21.1
20.6
-0.5
8/19/2014
21.6
20.6
-1.0
8/20/2014
21.7,
20.7
-1.0
8/25/2014
20.6
20.7
0.1
8/26/2014
19.6
19.0
-0.6
8/27/2014
19.9
19.1
-0.8
9/2/2014
22.0
21.4
-0.6
9/3/2014
21.4
21.4
0.0
9/4/2014
21.9
21.7
-0.2
9/8/2014
21.5
20.4
-1.1
9/9/2014
21.0
19.8
-1.2
9/10/2014
20.6
20.2
-0.4
9/15/2014
19.4
18.5
-0.9
9/16/2014
20.7
19.3
-1.4
9/17/2014
20.0
19.7
-0.3
9/22/2014
18.7
18.2
-0.5
9/23/2014
17.3
17.3
0.0
9/24/2014
16.1
15.5
-0.6
9/29/2014
17.8
17.8
0.0
9/30/2014
18.5
17.5
-1.0
10/1/2014
17.7
17.3
-0.4
10/6/2014
13.4
12.9
-0.5
10/13/2014
15.9
15.8
-0.1
10/21/2014
14.2
13.9
-0.3
10/27/2014
13.6
13.3
-0.3
1-1/3/2014
8.5
7-a
-0.8
11/10/2017
8.9
8.8
-0.1
11/17/2014
8.2
8.1
-0-4---
11/24/2014
8.8
8.7
-0.1
12/1/2014
8.7
8.7
0.0
12/8/2014
7.0
7.5
0.5
12/15/2014
5.6
5.6
0.0--
12/22/2014
7.3
7.7
0.4
12/29/2014
10.3
10.6
0.3
1/5/2015
7.2
7.7
0.5
1/12/2015
5.7
5.1
-0.6
1/21/2015
8.6
7.5
-1.1
1/26/2015
6.6
6.6
0.0
2/2/2015
7.4
7.2
-0.2
2/9/2015
8.4
8.4
0.0
2/16/2015
2.7
1.9
-0.8
2/23/2015
7.0
6.0
-1.0
Page 2 of 14
GB Perlmutter, rev. 11/21/2017
Fecal Coliform
!#/1001
Date
Upstream
Dnstream
Diff.
8/11/2014
373
213
160.0
8/12/2014
415
144
271.0
8/13/2014
220
210
10.0
8/18/2014
400
214
186.0
8/19/2014
224
186
38.0
8/20/2014
231
116
115.0
8/25/2014
470
17.2
452.8
8/26/2014
202
164
38.0
8/27/2014
289
56
233.0
9/2/2014
570
510
60.0
9/3/2014 >
1200
720
480.0
9/4/2014
410
490
-80.0
9/8/2014
3200
2600
600.0
9/9/2014
500
1020
-520.0
9/10/2014
444
700
-256.0
9/15/2014
620
240
380.0
9/16/2014
360
310
50.0
9/17/2014
440 >
1200
-760.0
9/22/2014
460
219
241.0
9/23/2014
232
156
76.0
9/24/2014
236
140
96.0
9/29/2014
510
169
341.0
9/30/2014
510
590
-80.0
10/1/2014
410
128
282.0
10/6/2014
156
124
32.0
10/13/2014
4200
2200
2000.0
10/21/2014
144
90
54.0
10/27/2014
103
62
41.0
11/3/2014
78
37
41A
11/10/2017
68
40
28.0
11/17/2014
4500
3000
-:4500.0
11/24/2014
3100
3200
-100.0
12/1/2014
109
50
59.0
12/8/2014
196
100
96.0
12/15/2014
76
55
21.0
12/22/2014
216
83
133.0
12/29/2014
353
253
100.0
1/5/2015
410
740
-330.0
1/12/2015
800
255
545.0
1/21/2015
120
65
55.0
1/26/2015
202
92
110.0
2/2/2015 >
1480
124
1356.0
2/9/2015
176
8.4
167.6
2/16/2015
96
15
81.0
2/23/2015
330
108
222.0
Page 2 of 14
GB Perlmutter, rev. 11/21/2017

Hendersonville WWTP
Instream Monitoring
Tem °C
NCO025534
Date
Upstream Dnstream Diff.
(#'1100)
3/2/2015
6.7
6.5
-0.2
3/9/2015
12.2
9.5
-2.7
3/16/2015
10.8
11.2
0.4
3/23/2015
12.8
12.3
-0.5
3/30/2015
10.9
9.8
-1.1
4/6/2015
12.2
12.3
0.1
4/13/2015
14.6
15.0
0.4
4/20/2015
15.3
14.8
-0.5
4/27/2015
13.8
14.1
0.3
5/4/2015
15.6
15.3
-0.3
5/12/2015
19.4
18.8
-0.6
5/18/2015
19.1
18.6
-0.5
5/27/2015
19.9
19.4
-0.5
6/1/2015
19.7
19.3
-0.4
6/2/2015
19.3
19.4
0.1
6/4/2015
18.8
18.6
-0.2
6/8/2015
21.0
20.2
-0.8
6/9/2015
20.9
20.2
-0.7
6/10/2015
20.4
20.2
-0.2
6/22/2015
21.4
21.5
0.1
6/23/2015
22.1
21.5
-0.6
6/24/2015
22.6
22.2
-0.4
6/29/2015
20.5
19.6
-0.9
6/30/2015
21.2
20.3
-0.9
7/1/2015
20.8
20.6
-0.2
7/6/2015
20.9
20.9
0.0
7/7/2015
20.6
20.8
0.2
7/8/2015
21.7
21.5
-0.2
7-/13-/-20I-5
23.7
22.0
0.3
7/14/2015
20.9
22.1
1.2
7/15�z 1-5
- 21.1
21.0
-0.1
7/20/2015
22.7
22.7
0.0
7/21/2015
23.2
23.0
-0.2
7/22/2015
23.2
22.6
-0.6
7/27/2015
23.3
23.0
-0.3
7/29/2015
23.4
24.7
1.3
7/30/2015
23.1
23.4
0.3
8/3/2015
21.8
12.3
-9.5
8/4/2015
22.0
12.5
-9.5
8/5/2015
22.3
22.0
-0.3
8/10/2015
22.3
22.3
0.0
8/11/2015
22.7
22.1
-0.6
8/12/2015
22.0
22.2
0.2
8/17/2015
20.5
20.7
0.2
8/18/2015
21.0
21.2
0.2
Instream Monitoring
NCO025534
Fecal Coliform
(#'1100)
Date
Upstream
Dnstream
Diff.
3/2/2015
111
100
11.0
3/9/2015
208
4
204.0
3/16/2015
142
1
141.0
3/23/2015
124
95
29.0
3/30/2015
290
128
162.0
4/6/2015
124
55
69.0
4/13/2015
410
132
278.0
4/20/2015
485
1100
-615.0
4/27/2015
204
124
80.0
5/4/2015
320
83
237.0
5/12/2015
200
117
83.0
5/18/2015
280
84
196.0
5/27/2015
2900
5700
-2800.0
6/1/2015
430
104
326.0
6/2/2015
3000
640
2360.0
6/4/2015
395
193
202.0
6/8/2015
385
3
382.0
6/9/2015
1710
5800
-4090.0
6/10/2015
765
475
290.0
6/22/2015
1140
1040
100.0
6/23/2015
510
196
314.0
6/24/2015
440
136
304.0
6/29/2015
410
91
319.0
6/30/2015
420
204
216.0
7/1/2015
490
192
298.0
7/6/2015
260
44
216.0
7/7/2015 >
1720
208
1512.0
7/8/2015
450
116
334.0
713/2015
281
95
186-0
7/14/2015 >
830
210
620.0
7/1-5t201-5 -
960
310
650.0
7/20/2015
360
98
262.0
7/21/2015
1020
660
360.0
7/22/2015
350
137
213.0
7/27/2015
470
82
388.0
7/29/2015
1040
460
580.0
7/30/2015
700
101
599.0
8/3/2015
233
184
49.0
8/4/2015
185
333
-148.0
8/5/2015
600
156
444.0
8/10/2015
333
168
165.0
8/11/2015
465 >
1200
-735.0
8/12/2015
330
340
-10.0
8/17/2015
560
270
290.0
8/18/2015 >
1820
310
1510.0
Page 3 of 14
GB Perlmutter, rev. 11/21/2017

Hendersonville WWTP Instream Monitoring NCO025534
Page 4 of 14
GB Perlmutter, rev. 11/21/2017
Temy 100
Fecal Coliform
Date
Upstream Dnstream Diff.
8/19/2015
21.3
21.4
8/24/2015
21.5
21.6
8/25/2015
21.1
21.3
8/26/2015
19.8
20.4
8/31/2015
19.1
19.5
9/14/2015
14.8
15.4
9/15/2015
15.0
15.4
9/16/2015
15.9
15.8
9/21/2015
18.8
18.9
9/22/2015
18.2
18.5
9/23/2015
18.3
18.4
9/28/2015
17.5
17.6
9/29/2015
18.6
18.3
9/30/2015
18.8
18.9
10/1/2015
20.1
20.3
10/2/2015
20.7
20.7
10/5/2015
16.0
16.1
10/8/2015
20.1
20.3
10/9/2015
21.0
21.3
10/10/2015
20.7
21.0
10/12/2015
15.6
16.1
10/19/2015
9.9
10.3
10/26/2015
14.6
15.0
11/2/2015
14.3
14.2
11/9/2015
10.4
11.6
11/16/2015
8.1
8.5
11/23/2015
8.0
9.8
11/30/2015
12.2
12.5
12/a/2-01.5
7.5
8.1
12/14/2015
13.2
12.9
--l2y23/2015
7.9
7.5
12/28/2015
14.0
14.1
-1/4/2016
7.2
7.3
1/11/2016
4.9
5.5
1/19/2016
2.7
2.4
1/26/2016
4.4
5.6
2/1/2016
7.7
8.3
2/8/2016
5.8
6.1
2/16/2016
4.9
3.9
2/22/2016
9.3
10.1
2/29/2016
8.3
8.6
3/7/2016
8.0
8.5
3/14/2016
13.1
8.0
3/21/2016
8.4
11.1
3/28/2016
15.0
8.7
Page 4 of 14
GB Perlmutter, rev. 11/21/2017
Fecal Coliform
f#/1001
Date
Upstream
Dnstream
Diff.
_
0.1
8/19/2015
450
297
153.0
0.1
8/24/2015
2000
5800
-3800.0
0.2
8/25/2015
560
660
-100.0
0.6
8/26/2015
330
240
90.0
0.4
8/31/2015
372
224
148.0
0.6
9/14/2015
500
430
70.0
0.4
9/15/2015
209
184
25.0
-0.1
9/16/2015
105
400
-295.0
0.1
9/21/2015
300
196
104.0
0.3
9/22/2015
380
156
224.0
0.1
9/23/2015
226
550
-324.0
0.1
9/28/2015
780
700
80.0
-0.3
9/29/2015
3300
680
2620.0
0.1
9/30/2015
820
600
220.0
0.2
10/1/2015
480
252
228.0
0.0
10/2/2015
380
191
189.0
0.1
10/5/2015
360
465
-105.0
0.2
10/8/2015 >
1140
140
1000.0
0.3
10/9/2015 >
1200
350
850.0
0.3
10/10/2015
332
525
-193.0
0.5
10/12/2015
176
172
4.0
0.4
10/19/2015
168
100
68.0
0.4
10/26/2015
140
108
32.0
-0.1
11/2/2015
1040
3500
-2460.0
1.2
11/9/2015 >
640 >
13900
-13260.0
0.4
11/16/2015
104
184
-80.0
1.8
11/23/2015
172
176
-4.0
0.3
11/30/2015
3000
560
2440.0
0.6
1-2/72-015---
153
218
-65.0
-0.3
12/14/2015
6500
116
6384.0
-0.4
x/23%2015
208
74
134.0
0.1
12/28/2015
240
220
20.0
0.1
--1/4/2016
90
176
-86.0
0.6
1/11/2016
87
63
24.0
-0.3
1%19/2016
123
61
62.0
1.2
1/26/2016
270
320
-50.0
0.6
2/1/2016
160
136
24.0
0.3
2/8/2016
148
117
31.0
-1.0
2/16/2016
197
500
-303.0
0.8
2/22/2016
129
82
47.0
0.3
2/29/2016
106
75
31.0
0.5
3/7/2016
72
14
58.0
-5.1
3/14/2016
224
204
20.0
2.7
3/21/2016
236
152
84.0
-6.3
3/28/2016
125
44
81.0
Page 4 of 14
GB Perlmutter, rev. 11/21/2017

Hendersonville WWTP
Tem °C
Date
Upstream
Dnstream Diff.
NCO025534
4/4/2016
10.9
12.1
1.2
4/11/2016
9.7
10.4
0.7
4/18/2016
12.5
13.4
0.9
4/25/2016
14.9
15.7
0.8
5/2/2016
19.0
18.0
-1.0
5/10/2016
18.0
17.0
-1.0
5/16/2016
14.0
14.0
0.0
5/24/2016
16.0
16.0
0.0
5/31/2016
19.0
20.0
1.0
6/1/2016
20.0
20.0
0.0
6/2/2016
20.0
20.0
0.0
6/6/2016
20.0
20.0
0.0
6/7/2016
20.0
20.0
0.0
6/8/2016
18.0
19.0
1.0
6/13/2016
21.0
21.0
0.0
6/14/2016
21.0
21.0
0.0
6/15/2016
22.0
21.0
-1.0
6/20/2016
19.0
19.0
0.0
6/21/2016
20.0
20.0
0.0
6/22/2016
21.0
21.0
0.0
6/27/2016
22.0
23.0
1.0
6/28/2016
22.0
22.0
0.0
6/29/2016
21.0
21.0
0.0
7/5/2016
23.0
23.0
0.0
7/6/2016
22.0
22.0
0.0
7/7/2016
21.0
22.0
1.0
7/11/2016
21.0
21.0
0.0
7/12/2016
21.0
21.0
0.0
7/13/-20-6
21
2-1.0-
0.0
7/18/2016
21.0
22.0
1.0
7/19/2016
22-.
22.0
0.0
7/20/2016
22.0
22.0
0.0
7/25/2016
22.0
23.0
1.0
7/26/2016
23.0
23.0
0.0
7/27/2016
23.0
23.0
0.0
8/1/2016
23.0
23.0
0.0
8/2/2016
22.0
22.0
0.0
8/3/2016
22.0
22.0
0.0
8/8/2016
22.0
22.0
0.0
8/9/2016
22.0
23.0
1.0
8/10/2016
22.0
22.0
0.0
8/15/2016
22.0
23.0
1.0
8/16/2016
22.0
22.0
0.0
8/17/2016
22.0
23.0
1.0
8/22/2016
21.0
21.0
0.0
Instream Monitoring
NCO025534
Fecal Coliform_(#L1
00
Date
Upstream
Dnstream
Diff.
4/4/2016
100
58
42.0
4/11/2016
89
43
46.0
4/18/2016
119
119
0.0
4/25/2016
410
85
325.0
5/2/2016
500
920
-420.0
5/10/2016
226
124
102.0
5/16/2016
184
98
86.0
5/24/2016
84
116
-32.0
5/31/2016
1140
320
820.0
6/1/2016
280
820
-540.0
6/2/2016
480 >
1200
-720.0
6/6/2016
620
390
230.0
6/7/2016
535
410
125.0
6/8/2016
450
232
218.0
6/13/2016
630
250
380.0
6/14/2016
300
239
61.0
6/15/2016
460
184
276.0
6/20/2016
370
209
161.0
6/21/2016
280
140
140.0
6/22/2016
370
183
187.0
6/27/2016
370
207
163.0
6/28/2016
680
5100
-4420.0
6/29/2016
420
760
-340.0
7/5/2016
640
440
200.0
7/6/2016
525
232
293.0
7/7/2016
440
2233
-1793.0
7/11/2016 >
1200
2400
-1200.0
7/12/2016 >
2840 >
10000
-7160.0
7/13/2-01v
1630
1833
-203.0
7/18/2016
390
259
131.0
7/19/2016
---268 -
108
160.0
7/20/2016
395
63
332.0
7/25/2016
-254
116
138.0
7/26/2016
226
136
90.0
7/27/2016
405
104
301.0
8/1/2016
340 >
670
-330.0
8/2/2016
430
250
180.0
8/3/2016 >
600 >
600
0.0
8/8/2016 >
6700
980
5720.0
8/9/2016
4100 >
6000
-1900.0
8/10/2016
1135
1350
-215.0
8/15/2016
280
173
107.0
8/16/2016
320
100
220.0
8/17/2016
300
720
-420.0
8/22/2016
392
157
235.0
Page 5of14
GB Perlmutter, rev. 11/21/2017

Hendersonville WWTP Instream Monitoring NCO025534
Tem °C
Date
Upstream
Dnstream Diff.
Date
8/23/2016
20.0
21.0
1.0
8/24/2016
20.0
21.0
1.0
8/29/2016
21.0
21.0
0.0
8/30/2016
20.0
21.0
1.0
8/31/2016
21.0
21.0
0.0
9/6/2016
20.0
20.0
0.0
9/7/2016
19.0
20.0
1.0
9/8/2016
20.0
20.0
0.0
9/12/2016
20.0
21.0
1.0
9/13/2016
21.0
21.0
0.0
9/14/2016
21.0
21.0
0.0
9/19/2016
21.0
20.0
-1.0
9/20/2016
21.0
21.0
0.0
9/21/2016
20.0
20.0
0.0
9/26/2016
21.0
21.0
0.0
9/27/2016
21.0
21.0
0.0
9/28/2016
20.0
21.0
1.0
10/3/2016
17.0
16.0
-1.0
10/10/2016
15.0
14.0
-1.0
10/17/2016
16.0
16.0
0.0
10/25/2016
13.0
13.0
0.0
11/1/2016
15.0
15.0
0.0
11/8/2016
9.0
10.0
1.0
11/15/2016
9.0
9.0
0.0
11/22/2016
6.0
6.0
0.0
11/28/2016
6.0
7.0
1.0
12/7/2016
9.0
9.0
0.0
12/12/2016
6.0
5.0
-1.0
1-2/-1-9/-2016-
TO
8.0
1.0
12/27/2016
12.0
12.0
0.0
1/3/2017
_
- _ -30.0
10.0
0.0
1/11/2017
6.0
5.0
-1.0
1/17/2017
12.0
12.0
0.0
1/25/2017
9.0
9.0
0.0
1/31/2017
6.0
6.0
0.0
2/7/2017
9.0
9.0
0.0
2/16/2017
7.0
7.0
0.0
2/21/2017
9.0
9.0
0.0
2/28/2017
9.0
9.0
0.0
275.0
39.0
186.0
136.0
48.0
456.0
-110.0
186.0
179.0
81.0
71.0
730.0
116.0
85.0
47.0
0.0
400.0
106.0
105.0
45.0
58.0
60.0
56.0
-44.0
50.0
69.0
160.0
-11.0
-50.0
-80.0
-340.0
-23.0
-32.0
160.0
-31.0
138.0
26.0
222.0
142.0
n 264
Fecal Coliform
[#/IOOJ
Date
Upstream
Dnstream
8/23/2016
495
220
8/24/2016
231
192
8/29/2016
230
44
8/30/2016
280
144
8/31/2016
220
172
9/6/2016
540
84
9/7/2016
140
250
9/8/2016
290
104
9/12/2016
239
60
9/13/2016
189
108
9/14/2016
179
108
9/19/2016 >
790
60
9/20/2016
192
76
9/21/2016
216
131
9/26/2016
231
184
9/27/2016 >
1200
1200
9/28/2016
2800 >
2400
10/3/2016
290
184
10/10/2016
286
181
10/17/2016
229
184
10/25/2016
113
55
11/1/2016
184
124
11/8/2016
140
84
11/15/2016
128
172
11/22/2016
96
46
11/28/2016
140
71
12/7/2016
340
180
12/12/2016
139
150
-1-2/-1-9/201-6
] 36
186
12/27/2016_
84
164
1/3/2017 >
_ - 980 >
1320
1/11/2017
121
144
1/17/2017
- 76
108
1/25/2017
460
300
1/31/2017
50
81
2/7/2017
200
62
2/16/2017
115
89
2/21/2017
278
56
2/28/2017
204
62
275.0
39.0
186.0
136.0
48.0
456.0
-110.0
186.0
179.0
81.0
71.0
730.0
116.0
85.0
47.0
0.0
400.0
106.0
105.0
45.0
58.0
60.0
56.0
-44.0
50.0
69.0
160.0
-11.0
-50.0
-80.0
-340.0
-23.0
-32.0
160.0
-31.0
138.0
26.0
222.0
142.0
n 264
264
264
n 264
264
264
mean 16.6
16.5
-0.2
mean 349
219
-6
max 23.4
24.7
2.7
max > 6,700 >
13,900
6,384
min 2.7
1.9
-9.5
min 22
1
-13260
No. values >200/100 mL
198
121
Page 6 of 14 GB Perlmutter, rev. 11/21/2017

Hendersonville WWTP Instream Monitoring NCO025534
Tem °C
Date Upstream Dnstream Diff.
Upstream vs. downstream pairwise t-test
p -value 0.731
Mean temp. not significantly different
between upstream and downstream
waters.
Fecal Coli orm (gL100)
Date Upstream Dnstream Diff.
Upstream vs. downstream pairwise t-test
p -value 0.953
Mean fecal coliform counts not significantly
different between upstream and
downstream waters.
Page 7 of 14
GB Perlmutter, rev. 11/21/2017

Hendersonville WWTP Instream Monitoring NC0025534_
DD m L
Date
Upstream
Dnstream Diff.
5.0 Limit
2/3/2014
10.3
10.7
-0.4
5
2/10/2014
11.2
11.1
0.1
5
2/17/2014
11.6
11.4
0.2
5
2/24/2014
10.5
10.7
-0.2
5
3/4/2014
10.6
11.3
-0.7
5
3/10/2014
10.2
10.1
0.1
5
3/18/2014
12.1
12.1
0.0
5
3/24/2014
11.2
11.3
-0.1
5
3/31/2014
11.9
11.4
0.5
5
4/8/2014
8.0
9.2
-1.2
5
4/14/2014
8.1
7.9
0.2
5
4/21/2014
9.6
9.5
0.1
5
4/28/2014
8.2
8.0
0.2
5
5/5/2014
8.4
8.3
0.1
5
5/12/2014
7.5
7.6
-0.1
5
5/19/2014
8.2
8.5
-0.3
5
5/28/2014
7.3
7.4
-0.1
5
6/2/2014
7.8
7.9
-0.1
5
6/3/2014
7.5
7.5
0.0
5
6/5/2014
7.5
7.5
0.0
5
6/9/2014
6.8
7.0
-0.2
5
6/10/2014
7.5
7.6
-0.1
5
6/11/2014
6.1
6.7
-0.6
5
6/16/2014
6.9
7.3
-0.4
5
6/18/2014
6.6
6.8
-0.2
5
6/19/2014
6.5
6.8
-0.3
5
6/24/2014
7.5
7.6
-0.1
5
6/25/2014
6.7
6.9
-0.2
5
6/26/2014
6:8
6.8
0.0
5 -
6/30/2014
6.3
6.7
-0.4
5
7/1/2014
--6.8-
7.3
-0.5
5 - -
7/2/2014
6.2
6.6
-0.4
5
7/7/2014
-7.1
7.2
-0.1
5
7/8/2014
6.9
7.0
-0.1
5
7/9/2014
6.6
6.6
0.0
5
7/14/2014
6.2
6.8
-0.6
5
7/15/2014
6.7
7.1
-0.4
5
7/16/2014
6.1
6.6
-0.5
5
7/21/2014
6.6
7.4
-0.8
5
7/22/2014
7.0
7.6
-0.6
5
7/23/2014
6.5
7.0
-0.5
5
7/28/2014
6.0
7.0
-1.0
5
8/4/2014
6.5
6.9
-0.4
5
8/5/2014
6.8
7.4
-0.6
5
8/6/2014
6.4
7.3
-0.9
5
Page 8 of 14
GB Perlmutter, rev. 11/21/2017

_Hendersonville WWTP
Instream Monitoring NC0025534
DO (malL
Date
Upstream
Dnstream
Diff.
5.0 Limit
8/11/2014
7.3
8.0
-0.7
5
8/12/2014
6.5
7.3
-0.8
5
8/13/2014
7.4
7.5
-0.1
5
8/18/2014
6.6
7.2
-0.6
5
8/19/2014
6.5
7.1
-0.6
5
8/20/2014
6.4
7.1
-0.7
5
8/25/2014
6.1
6.8
-0.7
5
8/26/2014
6.6
7.3
-0.7
5
8/27/2014
6.2
7.0
-0.8
5
9/2/2014
6.5
7.0
-0.5
5
9/3/2014
6.3
7.3
-1.0
5
9/4/2014
6.6
6.6
0.0
5
9/8/2014
5.4
6.4
-1.0
5
9/9/2014
7.1
7.7
-0.6
5
9/10/2014
6.4
7.5
-1.1
5
9/15/2014
6.8
7.4
-0.6
5
9/16/2014
7.2
7.9
-0.7
5
9/17/2014
6.2
7.2
-1.0
5
9/22/2014
6.2
7.3
-1.1
5
9/23/2014
5.7
7.6
-1.9
5
9/24/2014
6.2
7.9
-1.7
5
9/29/2014
5.0
8.2
-3.2
5
9/30/2014
6.4
8.0
-1.6
5
10/1/2014
7.3
7.9
-0.6
5
10/6/2014
9.0
9.3
-0.3
5
10/13/2014
6.7
7.6
-0.9
5
10/21/2014
7.9
8.7
-0.8
5
10/27/2014
8.8
9.3
-0.5
5
11/3/2014
10.1-
i-0-. 6
-D.5
5
11/10/2017
10.2
10.8
-0.6
5
11/17/2014
10.3
10.8
_
-----0-.5
5
11/24/2014
9.4
9.6
-0.2
5
12/1/2014
9.5
10.3
-0.8
5
12/8/2014
9.4
10.8
-1.4
5
12/15/2014
11.9
11.4
0.5
5
12/22/2014
11.4
11.5
-0.1
5
12/29/2014
10.1
10.7
-0.6
5
1/5/2015
9.4
8.9
0.5
5
1/12/2015
10.1
12.3
-2.2
5
1/21/2015
10.1
12.2
-2.1
5
1/26/2015
10.6
11.6
-1.0
5
2/2/2015
9.8
10.8
-1.0
5
2/9/2015
10.1
10.6
-0.5
5
2/16/2015
10.1
13.1
-3.0
5
2/23/2015
9.5
11.1
-1.6
5
Page 9 of 14 GB Perlmutter, rev. 11/21/2017

Hendersonville WWTP Instream Monitoring NC0025534_
DO (mq1L
Date
Upstream
Dnstream Diff.
5.0 Limit
3/2/2015
10.8
11.3
-0.5
5
3/9/2015
7.4
10.8
-3.4
5
3/16/2015
9.9
9.3
0.6
5
3/23/2015
9.3
9.1
0.2
5
3/30/2015
7.8
10.2
-2.4
5
4/6/2015
6.4
9.7
-3.3
5
4/13/2015
8.1
8.8
-0.7
5
4/20/2015
8.3
8.3
0.0
5
4/27/2015
8.0
8.4
-0.4
5
5/4/2015
7.9
8.2
-0.3
5
5/12/2015
6.3
7.4
-1.1
5
5/18/2015
7.1
7.6
-0.5
5
5/27/2015
6.6
6.6
0.0
5
6/1/2015
6.2
7.0
-0.8
5
6/2/2015
6.1
6.6
-0.5
5
6/4/2015
6.8
7.3
-0.5
5
6/8/2015
6.5
6.9
-0.4
5
6/9/2015
6.1
6.7
-0.6
5
6/10/2015
6.7
7.2
-0.5
5
6/22/2015
6.7
6.8
-0.1
5
6/23/2015
6.8
7.3
-0.5
5
6/24/2015
6.0
7.4
-1.4
5
6/29/2015
6.7
6.8
-0.1
5
6/30/2015
6.8
6.7
0.1
5
7/1/2015
6.9
7.1
-0.2
5
7/6/2015
6.3
6.9
-0.6
5
7/7/2015
7.1
7.2
-0.1
5
7/8/2015
7.0
6.8
0.2
5
7/13/2015
6-.5
6.Q
--0.3--
5
7/14/2015
6.6
6.7
-0.1
5
7/15/2015
6.0
-G fi -
-0.6
5 -
7/20/2015
6.9
7.0
-0.1
5
7/21/2015
5.7
6.0
-0.3
5
7/22/2015
6.2
6.6
-0.4
5
7/27/2415
6.3
6.3
0.0
5
7/29/2015
6.3
6.2
0.1
5
7/30/2015
6.5
7.7
-1.2
5
8/3/2015
6.6
6.7
-0.1
5
8/4/2015
6.1
6.6
-0.5
5
8/5/2015
6.8
6.7
0.1
5
8/10/2015
6.4
6.8
-0.4
5
8/11/2015
6.0
6.4
-0.4
5
8/12/2015
6.0
6.7
-0.7
5
8/17/2015
6.4
6.8
-0.4
5
8/18/2015
6.3
6.7
-0.4
5
Page 10 of 14 GB Perlmutter, rev. 11/21/2017

Hendersonville WWTP
Instream Monitoring NC0025534
DO m L
Date
Upstream
Dnstream
Diff.
5.0 Limit
8/19/2015
6.3
6.8
-0.5
5
8/24/2015
6.5
6.8
-0.3
5
8/25/2015
6.0
6.3
-0.3
5
8/26/2015
6.2
6.6
-0.4
5
8/31/2015
6.6
7.0
-0.4
5
9/14/2015
7.9
7.8
0.1
5
9/15/2015
7.9
8.4
-0.5
5
9/16/2015
7.9
8.0
-0.1
5
9/21/2015
6.8
7.5
-0.7
5
9/22/2015
7.1
7.4
-0.3
5
9/23/2015
6.1
6.9
-0.8
5
9/28/2015
7.3
7.6
-0.3
5
9/29/2015
7.1
7.9
-0.8
5
9/30/2015
7.0
7.4
-0.4
5
10/1/2015
6.5
5.6
0.9
5
10/2/2015
6.0
6.6
-0.6
5
10/5/2015
6.1
6.6
-0.5
5
10/8/2015
6.7
7.2
-0.5
5
10/9/2015
6.4
6.7
-0.3
5
10/10/2015
6.6
7.0
-0.4
5
10/12/2015
7.7
8.0
-0.3
5
10/19/2015
8.8
8.8
0.0
5
10/26/2015
7.4
7.8
-0.4
5
11/2/2015
8.4
8.7
-0.3
5
11/9/2015
9.7
9.1
0.6
5
11/16/2015
9.7
10.1
-0.4
5
11/23/2015
9.9
7.5
2.4
5
11/30/2015
8.5
8.7
-0.2
5
1��712-015
10.5
10.7
-�9.L
12/14/2015
8.4
9.4
-1.0
5
-12/21/2015
10.1
10.5
-0.4
_
v -5
12/28/2015
8.3
8.2
0.1
5
1/4/2016
10.3
10.1
0.2
-- 5
1/11/2016
11.3
11.0
0.3
5
1/19/2016
12.2
12.3
-0.1
5
1/26/2016
11.8
10.8
1.0
5
2/1/2016
10.8
10.9
-0.1
5
2/8/2016
11.1
11.1
0.0
5
2/16/2016
11.5
12.1
-0.6
5
2/22/2016
10.2
10.0
0.2
5
2/29/2016
11.5
11.6
-0.1
5
3/7/2016
10.9
10.7
0.2
5
3/14/2016
8.5
8.0
0.5
5
3/21/2016
10.6
11.1
-0.5
5
3/28/2016
7.3
8.7
-1.4
5
Page 11 of 14 GB Perlmutter, rev. 11/21/2017

Hendersonville WWTP Instream Monitoring NC0025534
DO m L
Date
Upstream
Dnstream Diff.
5.0 Limit
4/4/2016
9.2
8.8
0.4
5
4/11/2016
10.4
10.1
0.3
5
4/18/2016
9.2
9.1
0.1
5
4/25/2016
8.7
8.6
0.1
5
5/2/2016
7.7
8.3
-0.6
5
5/10/2016
7.4
7.7
-0.3
5
5/16/2016
7.6
8.9
-1.3
5
5/24/2016
8.1
8.2
-0.1
5
5/31/2016
6.7
7.4
-0.7
5
6/1/2016
7.0
7.5
-0.5
5
6/2/2016
6.8
7.1
-0.3
5
6/6/2016
6.7
7.0
-0.3
5
6/7/2016
6.2
7.1
-0.9
5
6/8/2016
7.4
7.7
-0.3
5
6/13/2016
6.2
6.9
-0.7
5
6/14/2016
7.1
7.2
-0.1
5
6/15/2016
7.4
7.8
-0.4
5
6/20/2016
7.9
8.0
-0.1
5
6/21/2016
6.9
7.0
-0.1
5
6/22/2016
7.2
7.6
-0.4
5
6/27/2016
6.1
6.8
-0.7
5
6/28/2016
7.1
6.5
0.6
5
6/29/2016
6.5
7.2
-0.7
5
7/5/2016
6.2
6.5
-0.3
5
7/6/2016
6.6
7.3
-0.7
5
7/7/2016
6.7
6.7
0.0
5
7/11/2016
6.5
6.4
0.1
5
7/12/2016
4.7
6.5
-1.8
5
-7/13/2016
6.1-6.a
-0.3
5
7/18/2016
6.0
6.8
-0.8
5
7/19/2016
6.9
7.3
-0.4-- -=-
5
7/20/2016
7.1
7.2
-0.1
5
7/25/2016
5.8
6.2
-0.4
5
7/26/2016
6.2
6.5
-0.3
5
7/27/2016
6.1
6.9
-0.8
5
8/1/2016
6.1
6.5
-0.4
5
8/2/2016
6.7
7.1
-0.4
5
8/3/2016
6.1
6.1
0.0
5
8/8/2016
6.4
6.9
-0.5
5
8/9/2016
7.0
7.3
-0.3
5
8/10/2016
6.2
6.5
-0.3
5
8/15/2016
6.6
6.7
-0.1
5
8/16/2016
6.9
6.9
0.0
5
8/17/2016
6.3
6.4
-0.1
5
8/22/2016
7.1
7.3
-0.2
5
Page 12 of 14 GB Perlmutter, rev. 11/21/2017

Hendersonville WWTP Instream Monitoring NC0025534
DO m L
Date
Upstream
Dnstream Diff.
5.0 Limit
8/23/2016
6.9
7
-0.1
5
8/24/2016
7.0
7.1
-0.1
5
8/29/2016
6.4
6.5
-0.1
5
8/30/2016
6.7
6.8
-0.1
5
8/31/2016
6.5
7
-0.5
5
9/6/2016
7.0
7.2
-0.2
5
9/7/2016
7.2
7.2
0.0
5
9/8/2016
6.9
7.1
-0.2
5
9/12/2016
7.4
7.6
-0.2
5
9/13/2016
7.0
7.3
-0.3
5
9/14/2016
7.1
7.1
0.0
5
9/19/2016
7.0
7.5
-0.5
5
9/20/2016
6.3
6.8
-0.5
5
9/21/2016
6.6
7.2
-0.6
5
9/26/2016
7.0
7.1
-0.1
5
9/27/2016
6.1
6
0.1
5
9/28/2016
5.7
6.4
-0.7
5
10/3/2016
6.6
8.1
-1.5
5
10/10/2016
8.1
8.2
-0.1
5
10/17/2016
8.0
8.1
-0.1
5
10/25/2016
8.1
8.8
-0.7
5
11/1/2016
7.5
7.7
-0.2
5
11/8/2016
9.5
10.0
-0.5
5
11/15/2016
12.0
11.1
0.9
5
11/22/2016
11.7
11.7
0.0
5
11/28/2016
11.2
11.1
0.1
5
12/7/2016
10.0
9.9
0.1
5
12/12/2016
11.6
11.2
0.4
5
12-/-19/2016
1-.9--
10.9
0.0
5
12/27/2016
10.0
9.8
0.2
5
1/3/2$x7
- 9.9
9.9
0.0
5
1/11/2017
12.2
11.6
0.6
5
1/17/2017
9.8
9.6
0.2
5
1/25/2017
10.1
10.2
-0.1
5
1/31/2017
12.1
11.7
0.4
5
2/7/2017
10.2
10.2
0.0
5
2/16/2017
11.3
11.3
0.0
5
2/21/2017
10.1
10.1
0.0
5
2/28/2017
10.5
10.9
-0.4
5
n
264
264
264
mean
7.8
8.2
-0.4
max
12.2
13.1
2.4
min
4.7
5.6
-3.4
Page 13 of 14 GB Perlmutter, rev. 11/21/2017

Hendersonville WWTP Instream Monitoring
DO m L
Date Upstream Dnstream Diff. 5.0 Limit
Upstream vs. downstream pairwise t-test
p -value 0.010
Mean DO concentrations not significantly
different between upstream and
downstream waters.
NCO025534
Page 14 of 14 GB Perlmutter, rev. 11/21/2017

Tem °C
Upstream Dnstream
mean 16.6 16.5
max 23.4 24.7
Pin 2.7 1.9
n = 264 for each parameter
DO m L
Upstream Dnstream
mean 7.8 8.2
max 12.2 13.1
min 4.7 5.6
n = 264 for each parameter.
Fecal Coliform 4/100
Upstream Dnstream
mean 349 219
max > 6700 > 13900
min 22 1
n = 264 for each parameter
Hendersonville WWTP
Permit No. NCO025534
Temperature
30
25
U 20
v 15
10 Upstream
Dnstream
5
0
O,� O,y O,0 Oy0 Oy0 A
O
Dissolved Oxygen
14
12
10 �.
J 8
E6 Upstream
4 Dnstream
2 5.0 Limit
0
01� OO,0 O,h O,0
0�10'L ,\'ti 0\ \L \1\ti
Fecal Coliform
16,000
14,000
12,000
0 10,000
�
8,000
0 6,000 Upstream
Z 4,000 Dnstream
2,000
0
01� o1a oyh O,yO 010 010 Oy1
5/15/2017

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Water Resources
ENVIRONMENTAL QUALITY
February 27, 2017
Lee Smith, Utilities Director
City of Hendersonville
PO Box 1760
Hendersonville, NC 28793-1760
SUBJECT: Compliance Sampling Inspection
Hendersonville WWTP
Permit No: NCO025534
Henderson County
Dear Mr. Smith:
ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
S. JAY ZIMMERMAN
Director
On February 23, 2017, 1 conducted a Compliance Evaluation Inspection of the Town of Hendersonville
WWTP. Based on records reviewed, on-site review of system components and interviews with staff, the
facility was determined to be in compliance with permit NC0025534. A report is attached for your
records with findings summarized. The facility appears to be well maintained and operated, and record
keeping and technical knowledge by your staff was excellent.
The assistance of Mr. Garrett Demoss, Mr. Scott Chovan, and Ms. Amy Huffman during the inspection
was greatly appreciated. If there are questions or additional information is needed regarding system
operation, maintenance, or permit questions, please feel free to contact me at 828-296-4500. Please
refer to the enclosed inspection report for additional observations and comments.
Sincerely,
Tim Heim, P.E.
Environmental Engineer
Enc.
cc: Garrett Demoss, ORC
MSC 1617 -Central Files -Basement
Asheville Files
G:\WR\WQ\Henderson\Wastewater\Municipal\Hendersonville WWTP 25534\CEI letter 2-23-2017.doe
State of North Carolina I Environmental Quality I Water Resources
2090 U.S. Highway 70 Swannanoa, NC 28778
828 296 4500

United States Environmental Protection Agency
Form Approved.
EPA Washington, D.C. 20460
OMB No. 2040-0057
Water Compliance Inspection Report
Approval expires B-31-98
Section A: National Data System Coding (i.e., PCS)
Transaction Code NPDES yr/mo/day Inspection Type Inspector Fac Type
1 1_I�N � 2 15 1 3 1 N00025534 111 121 17/02/22 117 18 I d 19 I s I 20I '
2111 1 1u1 IIIIIIIIIII III IIII1IIIIII IIIIIIIII11 f6
Inspection Work Days Facility Self -Monitoring Evaluation Rating B1 QA .-----Reserved
67 70 II_1 71 IitJI 72 �, � 73 �174 751 I I I I I I I80
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 17/02/22
11/05/01
Hendersonville WWTP
80 Balfour Rd
Exit Time/Date
Permit Expiration Date
Hendersonville NC 28792
02:OOPM 17/02/22
15/12/31
Name(s) of Onsite Representabve(s)/Tides(s)/Phone and Fax Number(s)
Other Facility Data
///
Garrett E Demoss/ORC/828-697-3077/
Name, Address of Responsible Officialrritle/Phone and Fax Number
Contacted
Lee Smith,PO Box 1760 Hendersonville NC 287931760//828-697-1707/
No
Section C: Areas Evaluated During Inspection (Check only those areas evaluated)
Permit Flow Measurement Operations & Maintenance 0 Records/Reports
Facility Site Review Effluent/Receiving Waters
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
Timothy H Heim ARO WQ//828-296-4665/
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 (Cont.)
NCO025534 I11 121 17/02/22 + 17 18 ICI
Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary)
Tim Heim of the Asheville Regional Office performed a Compliance Evaluation Inspection on February
23th, 2017. Garrett Demoss (ORC), Scott Chovan (Lab Manager and BORC) and Amy Huffman
(Pretreatment Coordinator) assisted with the inspection and with records and sampling results review.
The permitted discharge facility appeared well maintained and operated at the time of the inspection,
and in compliance with Permit NC0025534.
The permittee continues to make significant improvements and upgrades to the facility, including
preventative maintenance.
The following items were noted in the inspection (Reference 15A NCAC 02H.0124):
While it is understood that the facility has a very reliable power supply, the project to install the stand-by
generator listed in the CIP should be completed as soon as practicable.
Consider evaluating the need for a back-up chemical disinfection system as an alternative to the UV
system.
Page#

Permit: NCO025534
Inspection Data: 02/22/2017
Owner - Facility: Hendersonville ywvTP
Inspection Type: Compliance Evaluation
Operations & Maintenance Yes No NA NE
Is the plant generally clean with acceptable housekeeping? M ❑ ❑ ❑
Does the facility analyze process control parameters, for ex: MLSS, MCRT, Settleable 0 ❑ ❑ ❑
Solids, pH, DO, Sludge Judge, and other that are applicable?
Comment: Housekeeping and organization at the facility were excellent at the time of the inspection.
The facility Performs analysis for all relevant process parameters [MLSS. Settleable Solids.
PH, DO and Temperature), and performs laboratory analysis for BOD. NH3 and FC in
house. Pace Analytics performs contract analysis for metals, nutrients, VOCs, and FOG.
Meritech periodically performs analysis for low-level mercury and cyanide.
Permit
Yes No NA NE
(If the present permit expires in 6 months or less). Has the permittee submitted a new
■
❑
❑
❑
application?
# Is flow meter used for reporting?
M
❑
❑
Is the facility as described in the permit?
■
❑
❑
❑
# Are there any special conditions for the permit?
Is the flow meter operational?
❑
❑
❑
Is access to the plant site restricted to the general public?
(If units are separated) Does the chart recorder match the flow meter?
❑
❑
❑
Is the inspector granted access to all areas for inspection?
0
❑
❑
❑
Comment: The facility continues to operate under the 2011 Dermit while the new permit is being
reviewed.
Yes No NA NE
Is the pump wet well free of bypass lines or structures?
■
❑
Flow Measurement - Influent
Yes
No NA NE
# Is flow meter used for reporting?
M
❑
❑
❑
Is flow meter calibrated annually?
M
❑
❑
❑
Is the flow meter operational?
0
❑
❑
❑
(If units are separated) Does the chart recorder match the flow meter?
❑
❑
0
❑
Comment:
Pump Station - Influent
Yes No NA NE
Is the pump wet well free of bypass lines or structures?
■
❑
❑
❑
Is the wet well free of excessive grease?
0
❑
❑
❑
Are all pumps present?
M
❑
❑
❑
Are all pumps operable?
M
❑
❑
❑
Are float controls operable?
■
❑
❑
❑
Is SCADA telemetry available and operational?
0
❑
❑
❑
Is audible and visual alarm available and operational?
■
❑
❑
❑
Comment:
Page# 3

Permit: NCO025534
Owner - Facility: Hendersonville WWTP
Type of grit removal
Ext. Air
Inspection Date: 02/22/2017
Inspection Type: Compliance Evaluation
a.Manual
❑
Pump Station - Influent
Yes
No
NA NE
Are surface aerators and mixers operational?
Bar Screens
Yes No NA NE
Type of bar screen
■
❑
❑
❑
a.Manual
❑
❑
❑
❑
b.Mechanical
0
❑
❑
❑
Are the bars adequately screening debris?
❑
❑
❑
❑
Is the screen free of excessive debris?
❑
❑
❑
Is disposal of screening in compliance?
N
❑
❑
❑
Is the unit in good condition?
■
❑
❑
❑
Comment: Minor corrosion noted on auger housing. the ORC reports this will be replaced by stainless
steel in the near future.
Grit Removal
Yes No NA NE
Type of grit removal
Ext. Air
Type of aeration system
a.Manual
❑
Is the basin free of dead spots?
❑
b.Mechanical
❑
Are surface aerators and mixers operational?
❑ ❑
Is the grit free of excessive organic matter?
■
❑
❑
❑
Is the grit free of excessive odor?
0
❑
❑
❑
# Is disposal of grit in compliance?
0
❑
❑
❑
Comment:
Aeration Basins
Yes No NA NE
Mode of operation
Ext. Air
Type of aeration system
Diffused
Is the basin free of dead spots?
❑
❑
❑
Are surface aerators and mixers operational?
❑ ❑
❑
Are the diffusers operational?
■ ❑
❑
❑
Is the foam the proper color for the treatment process?
N ❑
❑
❑
Does the foam cover less than 25% of the basin's surface?
E ❑
❑
❑
Is the DO level acceptable?
■ ❑
❑
❑
Is the DO level acceptable?(1.0 to 3.0 mg/I)
0 ❑
❑
❑
Comment: The aeration basin is operated in a manner which utilizes one end with lower DO
concentration to encourage an anoxic zone for denitrification. The typical range of DO in the
anoxic zone is reported to be 0.5 ma/I. ranging up to 3.0 mall in the rest of the basin.
Page# 4

Permit: N00025534
Inspection Date: 02/22/2017
Owner - Facility: Hendersonville WVVTP
Inspection Type: Compliance Evaluation
Secondary Clarifier
Yes No NA NE
Is the clarifier free of black and odorous wastewater?
0
❑
❑
❑
Is the site free of excessive buildup of solids in center well of circular clarifier?
0
❑
❑
❑
Are weirs level?
0
❑
❑
❑
Is the site free of weir blockage?
0
❑
❑
❑
Is the site free of evidence of short-circuiting?
0
❑
❑
❑
Is scum removal adequate?
0
❑
❑
❑
Is the site free of excessive floating sludge?
N
❑
❑
❑
Is the drive unit operational?
0
❑
❑
❑
Is the return rate acceptable (low turbulence)?
0
❑
❑
❑
Is the overflow clear of excessive solids/pin floc?
0
❑
❑
❑
Is the sludge blanket level acceptable? (Approximately % of the sidewall depth)
0
❑
❑
❑
Comment: The belt drive unit on one of the clarifiers was recently replaced with a direct drive unit. The
other is scheduled to be replaced in the near future.
Disinfection - UV
Yes No NA NE
Are extra UV bulbs available on site?
0
❑
❑
❑
Are UV bulbs clean?
0
❑
❑
❑
Is UV intensity adequate?
M
❑
❑
❑
Is transmittance at or above designed level?
0
❑
❑
❑
Is there a backup system on site?
0
❑
❑
❑
Is effluent clear and free of solids?
■
❑
❑
❑
Comment: The system is calibrated annually. Operators receive an alarm if transmittance falls to an...
unacceptable level.
Page# 5

NH3/TRC WLA Calculations
Facility: Hendersonville WWTP
PermitNo. NC0025534
Prepared By: Claire Welling
Enter Design Flow (MGD): 4.8
Enter s7Q10 (cfs): 34.9
Enter w7Q10 (cfs): 46.8
Total Residual Chlorine (TRC)
Daily Maximum Limit (ug/1)
s7Q10 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (UG/L)
Upstream Bkgd (ug/1)
IWC (%)
Allowable Conc. (ug/1)
Fecal Coliform
Monthly Average Limit:
(If DF >331; Monitor)
(If DF<331; Limit)
Dilution Factor (DF)
34.9
4.8
7.44
17.0
0
17.57
97
C; eVe-0 @ Ap9/L
200/100m I
5.69
Ammonia (Summer)
Monthly Average Limit (mg NH3-N/1)
s7Q10 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (MG/L)
Upstream Bkgd (mg/1)
IWC (%)
Allowable Conc. (mg/1)
Ammonia (Winter)
Monthly Average Limit (mg NH3-N/1)
w7Q10 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (MG/L)
Upstream Bkgd (mg/1)
IWC (%)
Allowable Conc. (mg/1)
Total Residual Chlorine
1. Cap Daily Max limit at 28 ug/I to protect for acute toxicity
Ammonia (as NH3-N)
1. If Allowable Conc > 35 mg/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
34.9
4.8
7.44
1.0
0.22
17.57
4.7 t'1 1�
14 -1 \r),A
46.8
4.8
7.44
1.8
0.22
13.72
11.7 MA
Fecal Coliform
1. Monthly Avg limit x 2 = 400/100 ml = Weekly Avg limit (Municipals) = Daily Max limit (Non -Muni)

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REASONABLE POTENTIAL ANALYSIS
H1
H2
Ow -PASTE SPECIAL
Use 'PASTE SPECIAL
Effluent Hardness
Y" tl un C°F'-
Upstream Hardness
Values' "c'COPY'.
M �Imun1 ❑ati
MAslmfnum data
point! = S8
points = 56
Date
Data
BDL=112DL
Results
Date
Data
BDL=1/2DL
Results
1
9/19/2013
32.2
32.2
Std Dev.
.`:
1
5/1/2017
17.8
17.8
Std Dev.
1.4WQ
2
6/16/2014
34.1
34.1
Mean
34.0500
2
5/2/2017
16.8
16.8
Mean
16.7000
3
5/11/2015
33.6
33.6
C.V. (default)
0.6000
3
5/3/2017
17.3
17.3
C.V. (default)
0.6000
4
5/1/2017
34.7
34.7
n
8
4
5/4/2017
17.5
17.5
n
5
5
5/2/2017
35.6
35.6
10th Per value
31.81 mg/L
5
5/5/2017
14.1
14.1
10th Per value
15.18 mg/L
6
5/3/2017
36.3
36.3
Average Value
34.05 mg/L
6
Average Value
16.70 mg/L
7
5/4/2017
35
35
Max. Value
36.30 mg/L
7
Max. Value
17.80 mg/L
8
5/5/2017
30.9
30.9
8
9
9
10
10
11
11
12
12
13
13
14
14
15
15
16
16
17
17
18
18
19
19
20
20
21
21
22
22
23
23
24
24
25
25
26
26
27
27
28
28
29
29
30
30
31
31
32
32
33
33
34
34
35
35
36
36
37
37
38
38
39
39
40
40
41
41
42
42
43
43
44
44
45
45
46
46
47
47
48
48
49
49
50
50
51
51
52
52
53
53
54
54
55
55
56
56
57
I
57
58
58
NC0025534- Hendersonville 2017 RPA, data
1 5/16/2017

Par01 & Par02
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
Arsenic
Date Data BDL=112DL
9/19/2013 < 10 5
6/16/2014 < 10 5
5/11/2015 < 10 5
REASONABLE POTENTIAL ANALYSIS
Lim'PASTE SPEa
varufs marl "COF
Maximum Qrti
points = so
Results
Std Dev. O.00:
Mean 5.0000
C.V. 0.0000
n 3
Mult Factor = 1.00
Max. Value 5.0 ug/L
Max. Pred Cw O DETECTS ug/L
-2-
NC0025534- Hendersonville 2017 RPA, data
5/16/2017

REASONABLE POTENTIAL ANALYSIS
Par03
Par04
Um "PASTE $PECtAL
u■■'PAB-* SPGa
Beryllium
elk, than "COPY"
Cadmium
Values' thou 'iDPV
Maximum data
Maximum data
Wnis = 5a
palnis - 58
Date
Data BDL=1/2DL
Results
Date
Data
BDL=112DL
Results
1
9/19/2013
< 1 0.5
Std Dev.
0 ?C ':'
1
3/15/2013
<
1
0.5
Std Dev.
0.00clrl
2
6/16/2014
< 1 0.5
Mean
0.5000
2
6/21/2013
<
1
0.5
Mean
0.5000
3
5/11/2016
< 1 0.5
C.V.
0.0000
3
8/30/2013
<
1
0.5
C.V.
0.0000
4
n
3
4
9/19/2013
<
1
0.5
n
17
5
5
12/9/2013
<
1
0.5
6
Mult Factor =
1.00
6
3/7/2014
<
1
0.5
Mult Factor =
1.00
7
Max. Value
0.50 ug/L
7
5/29/2014
<
1
0.5
Max. Value
0.500 ug/L
8
Max. Pred Cw
O DETECTS ug/L
8
6/16/2014
<
1
0.5
Max. Pred Cw
O DETECTS ug/L
9
9
9/19/2014
<
1
0.5
10
10
3/20/2015
<
1
0.5
11
11
5/11/2015
<
1
0.5
12
12
6/26/2015
<
1
0.5
13
13
9/24/2015
<
1
0.5
14
14
12/3/2015
<
1
0.5
15
15
4/18/2016
<
1
0.5
16
16
9/26/2016
<
1
0.5
17
17
10/14/2016
<
1
0.5
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
NC0025534- Hendersonville 2017 RPA, data
- 3 - 5/16/2017

REASONABLE POTENTIAL ANALYSIS
Par05
Chlorides
Us* ,PASTE SPFCuu-
MnapUet um �naCoP
Par06
I.. -PASM SF
v° wm' #Wm
Chlorinated Phenolic Compounds
(
Pam! - 5
st
Date Data
BDL=1/2DL Results I
Date Data BDL=1/2DL Results
1
Std Dev.
NO DATA
1
Std Dev.
NO DATA
2
Mean
NO DATA
2
Mean
NO DATA
3
C.V.
NO DATA
3
C.V.
NO DATA
4
n
0
4
n
0
5
5
6
Mult Factor =
N/A
6
Mult Factor =
N/A
7
Max. Value
N/A mg/L
7
Max. Value
N/A
8
Max. Pred Cw
N/A mg/L
8
Max. Pred Cw
N/A
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
NC0025534- Hendersonville 2017 RPA, data
-4- 5/16/2017

REASONABLE POTENTIAL ANALYSIS
cL
ItlY
1 Par07
j
Total Phenolic Compounds
Uas -PAM SPECIAL
"''''"'" "" "caPr-
-M piriumdata
Par08
11aa-PASTE Sr
Chromium III
""" "* "1°" "'
. Maximum
Pak" - 5
Fw+nta = 58
Date
Data BDL=112DL
Results
Date
Data BDL=112DL Results
1
9/19/2013
8.4 8.4
Std Dev.
::a 27 7 ;:
1
Std Dev.
NO DATA
2
6/16/2014
92 92
Mean
35.1333
2
Mean
NO DATA
3
5/11/2015
< 10 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
ug/L
7
Max. Value
92.0 ug/L
7
Max. Value
N/A
ug/L
8
Max. Pred Cw
276.0 ug/L
8
Max. Pred Cw
N/A
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
NC0025534- Hendersonville 2017 RPA, data
- 5 - 5/16/2017

Par09
1
2
3
4
5
6
pg/L 7
Ng/L 8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
REASONABLE POTENTIAL ANALYSIS
Chromium VI
Date Data BDL=1/2DL Results
Std Dev.
Mean
C.V.
n
Mult Factor =
Max. Value
Max. Pred Cw
ow "PASTE SP✓`CUkL
Parl0
0" -PASTE SF
lromium, Total
Vatues" men 'ropy,
. Umlmmn data,
pWrda � Ei
BDL=112DL
points = 58
i 2.5
Std Dev.
i 2.5
Date
Data
NO DATA
1
3115/2013
<
NO DATA
2
6/21/2013
<
NO DATA
3
8/30/2013
<
0
4
9/19/2013
<
Max. Pred Cw
5
12/9/2013
<
NIA
6
3/7/2014
<
N/A Ng/L
7
5/29/2014
<
N/A pg/L
8
6/16/2014
<
9
9/19/2014
<
i 2.5
10
3!20/2015
<
11
5/11/2015
<
12
6/26/2015
<
13
9/24/2015
<
14
12/3/2015
<
15
2/19/2016
<
16
4/18/2016
<
17
9/26/2016
<
18
10/14/2016
<
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
-6-
CI
NC0025534- Hendersonville 2017 RPA, data
5/16/2017
0" -PASTE SF
lromium, Total
pWrda � Ei
BDL=112DL
Results
i 2.5
Std Dev.
i 2.5
Mean
2.5000
i 2.5
C.V.
0.0000
i 2.5
n
18
i 2.5
i 2.5
Mult Factor =
1.00
i 2.5
Max. Value
2.5
i 2.5
Max. Pred Cw
O DETECTS
i 2.5
i 2.5
i 2.5
i 2.5
i 2.5
i 2.5
i 2.5
i 2.5
i 2.5
i 2.5
NC0025534- Hendersonville 2017 RPA, data
5/16/2017

pg/L
Ng/L
REASONABLE POTENTIAL ANALYSIS
Copper
llee'PAM SPECAL
Parl2
Date
Data
BDL=1/2DL
Results
1
2/4/2013
7
7
Std Dev.
2
3/15/2013
8.4
8.4
Mean
3
5/6/2013
7.9
7.9
C.V.
4
6/21/2013
13.1
13.1
n
5
8/5/2013
16.3
16.3
5
6
8/30/2013
13.8
13.8
Mult Factor =
7
9/19/2013
15.3
15.3
Max. Value
8
11/4/2013
20
20
Max. Pred Cw
9
12/9/2013
8.5
8.5
5
10
2/3/2014
17
17
3/7/2014
11
3/7/2014
9.5
9.5
37.60 ug/L
12
5/5/2014
13.4
13.4
5
13
5129/2014
10.4
10.4
<
14
6/16/2014
16.5
16.5
9
15
8/4/2014
13.4
13.4
16
9/19/2014
15.2
15.2
5
17
11/3/2014
11.6
11.6
5/11/2015
18
2/2/2015
8.6
8.6
19
3120/2015
12
12
5
20
5/4/2015
11.7
11.7
<
21
5/11/2015
13.9
13.9
14
22
6/26/2015
11.2
11.2
23
8/3/2015
25.3
25.3
8
24
9/24/2015
13.4
13.4
9/26/2016
25
11/2/2015
9.6
9.6
26
12/3/2015
9.7
9.7
27
2/1/2016
9.8
9.8
28
2/29/2016
37.6
37.6
19
29
4/18/2016
8.5
8.5
30
512/2016
8.3
8.3
31
5/23/2016
12.4
12.4
32
8/1/2016
13.6
13.6
33
9/26/2016
18
18
34
10/7/2016
15.3
15.3
35
10/14/2016
22.4
22.4
24
36
37
25
38
26
39
40
41
28
42
29
43
44
30
45
31
46
47
48
33
49
34
50
51
35
52
36
53
54
55
38
56
39
57
58
40
llee'PAM SPECAL
Parl2
Cyanide
vague.- then "COPY'
. Yaximurn dmtl
poln4 - 59
1
Date
3/15/2013
Data
<
5
BDL=1/2DL
5
Results
Std Dev.
5.9032
13.6743
2
6/21/2013
<
5
5
Mean
0.4317
3
8/30/2013
<
5
5
C.V.
35
4
9/19/2013
7
5
n
5
12/9/2013
<
5
5
1.11
6
3/7/2014
<
5
5
Mult Factor =
37.60 ug/L
7
6/16/2016
<
5
5
Max. Value
41.74 ug/L
8
9/19/2014
<
5
5
Max. Pred Cw
9
11/21/2014
<
5
5
10
3/20/2015
<
5
5
11
5/11/2015
<
8
5
12
9/24/2015
<
5
5
13
12/3/2015
<
5
5
14
2/29/2016
<
5
5
15
4/18/2016
<
8
5
16
9/26/2016
<
5
5
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
USE -PASTE Sr
Wluest' then N
. tAe linLRn i
poll t► =:5
,.w
5.00
0.0000
16
1.00
5.0
5.0
NC0025534- Hendersonville 2017 RPA, data
- 7 - 5/16/2017

REASONABLE POTENTIAL ANALYSIS
NC0025534- Hendersonville 2017 RPA, data
- 8 5/16/2017
Parl3
N)Pr,
Fluoride
low
Us* -PASTE SPECIAL
8
Date Data
BDL=1/2DL Results
1
Std Dev.
Lead
2
Mean
JA WumUm data
3
C.V.
4
n
. riA+l�it1W rn
5
6
Mult Factor =
ug/L
7
Max. Value
ug/L
8
Max. Pred Cw
BDL=1/2DL
9
hIG DATA
10
3/15/2013
< 5
11
Std Dev.
0.0) ,
12
2
6/21/2013
13
2.5
Mean
14
NO DATA
3
15
< 5
2.5
16
0.0000
0
17
9/1912013
< 5
18
n
18
19
5
12/9/2013
20
2.5
21
N/A
6
22
< 5
2.5
23
1.00
N/A ug/L
24
5/29/2014
< 5
25
Max. Value
2.500
26
8
6/16/2014
27
2.5
Max. Pred Cw O DETECTS
28
9
9/19/2014
29
2.5
30
10
31
< 5
2.5
32
33
5/11/2015
< 5
34
35
12
6/26/2015
36
2.5
37
13
38
< 5
2.5
39
40
12/3/2015
< 5
41
42
15
2/29/2016
43
2.5
44
16
45
< 5
2.5
46
47
9/26/2016
< 5
48
49
18
10/14/2016
50
2.5
51
19
52
53
54
55
56
21
57
58
NC0025534- Hendersonville 2017 RPA, data
- 8 5/16/2017
Par14
Us* -PASTE SPECIAL
/Jae STE 5i
Values- Shen -COPY'
Lead
V.I•PALIw
JA WumUm data
. riA+l�it1W rn
points = So
pohtb = 4
Date
BDL=1/2DL
Results
hIG DATA
1
3/15/2013
< 5
2.5
Std Dev.
0.0) ,
NO DATA
2
6/21/2013
< 5
2.5
Mean
2.5000
NO DATA
3
8/30/2013
< 5
2.5
C.V.
0.0000
0
4
9/1912013
< 5
2.5
n
18
5
12/9/2013
< 5
2.5
N/A
6
3/7/2014
< 5
2.5
Mult Factor =
1.00
N/A ug/L
7
5/29/2014
< 5
2.5
Max. Value
2.500
N/A ug/L
8
6/16/2014
< 5
2.5
Max. Pred Cw O DETECTS
9
9/19/2014
< 5
2.5
10
3/20/2015
< 5
2.5
11
5/11/2015
< 5
2.5
12
6/26/2015
< 5
2.5
13
9/24/2015
< 5
2.5
14
12/3/2015
< 5
2.5
15
2/29/2016
< 5
2.5
16
4/18/2016
< 5
2.5
17
9/26/2016
< 5
2.5
18
10/14/2016
< 5
2.5
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
NC0025534- Hendersonville 2017 RPA, data
- 8 5/16/2017

REASONABLE POTENTIAL ANALYSIS
/)"'PASTE Sr
V,IUN" than -t
Mrxknum t
pair" = d
NO DATA
NO DATA
NO DATA
0
N/A
N/A
NIA
NC0025534- Hendersonville 2017 RPA, data
9 5/16/2017
Par15
IECIAL
va,or: then'c❑PY,
Mercury
flu frfa
a
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 =
ug/L
7
Max. Value
ug/L
8
Max. Pred Cw
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
/)"'PASTE Sr
V,IUN" than -t
Mrxknum t
pair" = d
NO DATA
NO DATA
NO DATA
0
N/A
N/A
NIA
NC0025534- Hendersonville 2017 RPA, data
9 5/16/2017
Par16
u•PASTE SPEMAL
U"
va,or: then'c❑PY,
Molybdenum
M.lxlmLirn da la
points = 55
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. Pred Cw
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
/)"'PASTE Sr
V,IUN" than -t
Mrxknum t
pair" = d
NO DATA
NO DATA
NO DATA
0
N/A
N/A
NIA
NC0025534- Hendersonville 2017 RPA, data
9 5/16/2017

REASONABLE POTENTIAL ANALYSIS
;0P`r
Par17 & Par18
Nickel
Use 'PASPECEILL
Yglues',nanCopy
Par19
Selenium
*
poVnis= MDate
Data
BDL=1/2DL
Results
Date
Data
BDL=112DL
Results
1
10/6/2013
19.7
19.7
Std Dev.
1r:
1
3/15/2013
<
10
5
Std Dev.
2
11/4/2013
26.8
26.8
Mean
11.7836
2
6/21/2013
<
10
5
Mean
3
12/2/2013
9.8
9.8
C.V.
1.2965
3
9/19/2013
<
10
5
C.V.
4
12/9/2013
6.5
6.5
n
55
4
12/9/2013
<
10
5
n
5
1/4/2014
<
5
2.5
5
3/7/2014
<
10
5
6
2/3/2014
17.4
17.4
Mult Factor =
1.03
6
5/29/2014
<
10
5
Mult Factor =
ug/L
7
3/3/2014
13.4
13.4
Max. Value
107.0 Ng/L
7
6/16/2014
<
10
5
Max. Value
ug/L
8
3/7/2014
11.8
11.8
Max. Pred Cw
110.2 Ng/L
8
9/19/2014
<
10
5
Max. Pred Cw
9
4/7/2014
6.4
6.4
9
3/20/2015
<
10
5
10
5/5/2014
9.4
9.4
10
5/11/2015
<
10
5
11
5/29/2014
7.2
7.2
11
6/26/2015
<
10
5
12
6/3/2014
7.9
7.9
12
9/24/2015
<
10
5
13
6/16/2014
9.4
9.4
13
12/3/2015
<
10
5
14
7/7/2014
12.8
12.8
14
2/29/2016
<
10
5
15
8/4/2014
9.1
9.1
15
4/18/2016
<
10
5
16
9/8/2014
18.6
18.6
16
9/26/2016
<
10
5
17
9/19/2014
8.7
8.7
17
10/14/2016
<
10
5
18
10/612014
9.4
9.4
18
19
11/3/2014
6.9
6.9
19
20
12/1/2014
<
5
2.5
20
21
1/5/2015
<
5
2.5
21
22
2/2/2015
16.3
16.3
22
23
3/2/2015
107
107
23
24
3/20/2015
38.8
38.8
24
25
4/6/2015
38.2
38.2
25
26
5/4/2015
10.6
10.6
26
27
5/11/2015
13.6
13.6
27
28
6/1/2015
6.5
6.5
28
29
6/26/2015
9
9
29
30
7/6/2015
24
24
30
31
8/3/2015
14.6
14.6
31
32
9/7/2015
7.5
7.5
32
33
9/24/2015
5.9
5.9
33
34
10/5/2015
<
5
2.5
34
35
11/2/2015
<
5
2.5
35
36
12/3/2015
<
5
2.5
36
37
12/8/2015
<
5
2.5
37
38
1/4/2016
<
5
2.5
38
39
2/1/2016
<
5
2.5
39
40
2/19/2016
<
5
2.5
40
41
3/7/2016
<
5
2.5
41
42
4/5/2016
16.1
16.1
42
43
4/18/2016
7.8
7.8
43
44
5/2/2016
15
15
44
45
5/23/2016
7.7
7.7
45
46
6/6/2016
7.4
7.4
46
47
7/4/2016
7.3
7.3
47
48
8/1/2016
6.1
6.1
48
49
9/5/2016
5.1
5.1
49
50
9/26/2016
6
6
50
51
10/3/2016
5.9
5.9
51
52
10/7/2016
11.1
11.1
52
53
10/14/2016
13.3
13.3
53
54
11/5/2016
<
5
2.5
54
55
1/2/2017
6.1
6.1
55
56
56
57
57
58
58
NC0025534- Hendersonville 2017 RPA, data
-10- 5/16/2017

Uw„PASTE SPECIAL Par20
vidume than "copr
. rilaxlmurn data
owwtw a 38
5.0000
0.0000
17
1.00
5.0 ug/L
O DETECTS ug/L
REASONABLE POTENTIAL ANALYSIS
Date Data
1 3/15/2013 <
2 6/21/2013 <
3 9/19/2013 <
4 12/9/2013 <
5 3/7/2014 <
6 5/29/2014 <
7 6/16/2014 <
8 9/19/2014 <
9 3/20/2015 <
10 5/11/2015 <
11 6/26/2015 <
12 9/24/2015 <
13 12/3/2015 <
14 2/29/2016 <
15 4/18/2016 <
16 9/26/2016 <
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
Silver
U" *PASTESPE MAL
Values" then -COPY-
Par21
Zinc
htinilrrYm dJ[d
points = 58
BDL=112DL
Results
Date
Data
BDL=1/2DL
Results
5 2.5
Std Dev.
0.0&
1
3/15/2013
66.3
66.3
Std Dev.
5 2.5
Mean
2.5000
2
5/6/2013
42.6
42.6
Mean
5 2.5
C.V.
0.0000
3
6/21/2013
51
51
C.V.
5 2.5
n
16
4
8/5/2013
48.6
48.6
n
5 2.5
5
9/19/2013
53.5
53.5
5 2.5
Mult Factor =
1.00
6
11/4/2013
68.8
68.8
Mult Factor =
5 2.5
Max. Value
2.500 ug/L
7
12/9/2013
39.8
39.8
Max. Value
5 2.5
Max. Pred Cw
O DETECTS ug/L
8
2/3/2014
78.5
78.5
Max. Fred Cw
5 2.5
9
3/7/2014
69.4
69.4
5 2.5
10
5/5/2014
69.3
69.3
5 2.5
11
5/29/2014
4.47
4.47
5 2.5
12
6/16/2014
60
60
5 2.5
13
8/4/2014
72.5
72.5
5 2.5
14
9/19/2014
62.3
62.3
5 2.5
15
111312014
50.2
50.2
5 2.5
16
2/2/2015
67.8
67.8
17
3/20/2015
66.3
66.3
18
5/4/2015
60.3
60.3
19
5/11/2015
68.4
68.4
20
6/26/2015
65.5
65.5
21
8/3/2015
85.3
85.3
22
9/24/2015
65.5
65.5
23
11/2/2015
29.5
29.5
24
12/3/2015
39.8
39.8
25
2/1/2016
60.2
60.2
26
2/29/2016
77.6
77.6
27
4/18/2016
66.9
66.9
28
5/2/2016
77.6
77.6
29
5/23/2016
45.4
45.4
30
8/1/2016
58.3
58.3
31
9/26/2016
73
73
32
10/7/2014
77.4
77.4
33
10/14/2016
81.4
81.4
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
NCO025534- Hendersonville 2017 RPA, data
11 - 5/16/2017

REASONABLE POTENTIAL ANALYSIS
Use -PASTE SPECIAL
Par22
Use 'PASTE SPECIAL
Par23
Values'the n'COFY'O
Values" than "CORY"
. M2mvm data
Maximum data
points = 56
Wnts = 56
Date Data
1
BDL=1/2DL Results
Std Dev.
L.
NO DATA
1
16.7199
60.7112
2
Mean
NO DATA
2
0.2754
3
C.V.
NO DATA
3
33
4
n
0
4
5
5
1.08
6
Mult Factor =
N/A
6
85.3 ug/L
7
Max. Value
N/A
7
92.1 ug/L
8
Max. Pred Cw
N/A
8
9
9
10
10
11
11
12
12
13
13
14
14
15
15
16
16
17
17
18
18
19
19
20
20
21
21
22
22
23
23
24
24
25
25
26
26
27
27
28
28
29
29
30
30
31
31
32
32
33
33
34
34
35
35
36
36
37
37
38
38
39
39
40
40
41
41
42
42
43
43
44
44
45
45
46
46
47
47
48
48
49
49
50
50
51
51
52
52
53
53
54
54
55
55
56
56
57
57
58
58
0
Date Data BDL=1/2DL
NC0025534- Hendersonville 2017 RPA, data
-12- 5/16/2017

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Permit No.
NPDES Implementation of Instream Dissolved Metals Standards - Freshwater Standards
The NC 2007-2015 Water Quality Standard (WQS) Triennial Review was approved by the NC
Environmental Management Commission (EMC) on November 13, 2014. The US EPA subsequently
approved the WQS revisions on April 6, 2016, with some exceptions. Therefore, metal limits in draft
permits out to public notice after April 6, 2016 must be calculated to protect the new standards - as
approved.
Table 1. NC Dissolved Metals Water Quality Standards/Aquatic Life Protection
Parameter
Acute FW, gg/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-[In hardness](0.041838)} e^{0.9151 [In hardness] -3.1485}
Cadmium, Acute Trout waters
WER*{1.136672-[ln hardness](0.041838)} e^{0.9151[In hardness] -3.6236}
Cadmium, Chronic
WER*{1.101672-[In hardness](0.041838)) e^{0.7998[ln hardness] -4.4451}
Chromium III, Acute
WER*0.316 e^{0.8190[ln hardness]+3.7256}
Chromium III, Chronic
WER*0.860 e^{0.8190[ln hardness]+0.6848}
Copper, Acute
WER*0.960 e^{0.9422[ln hardness] -1.700}
Copper, Chronic
WER*0.960 e^{0.8545[ln hardness] -1.702}
Lead, Acute
VIER* {1.46203-[ln hardness](0.145712)} • eAll .273[In hardness] -1.460}
Lead, Chronic
WER*{1.46203-[ln hardness](0.145712)) • e^{1.273[ln hardness] -4.705}
Nickel, Acute
WER*0.998 e^{0.8460[ln hardness]+2.255}
Nickel, Chronic
WER*0.997 e^{0.8460[ln hardness]+0.0584}
Page 1 of 4

Permit No.
Silver, Acute
WER*0.85 • e^{1.72[ln hardness] -6.59)
Silver, Chronic
Not applicable
Zinc, Acute
WER*0.978 a^{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/W BELs for Hardness -De endent Metals - Freshwater
The RPA is designed to predict the maximum likely effluent concentrations for each metal of concern,
based on recent effluent data, and calculate the allowable effluent concentrations, based on applicable
standards and the critical low -flow values for the receiving stream.
If the maximum predicted value is greater than the maximum allowed value (chronic or acute), the
discharge has reasonable potential to exceed the standard, which warrants a permit limit in most cases. If
monitoring for a particular pollutant indicates that the pollutant is not present (i.e. consistently below
detection level), then the Division may remove the monitoring requirement in the reissued permit.
1. To perform a RPA on the Freshwater hardness -dependent metals the Permit Writer compiles the
following information:
• Critical low flow of the receiving stream, 7Q10 (the spreadsheet automatically calculates
the 1 Q 10 using the formula 1 Q 10 = 0.843 (s7Q 10, cfs) 0.993
• Effluent hardness and upstream hardness, site-specific data is preferred
• Permitted flow
• Receiving stream classification
2. In order to establish the numeric standard for each hardness -dependent metal of concern and for
each individual discharge, the Permit Writer must first determine what effluent and instream
(upstream) hardness values to use in the equations.
The permit writer reviews DMR's, Effluent Pollutant Scans, and Toxicity Test results for any
hardness data and contacts the Permittee to see if any additional data is available for instream
hardness values, upstream of the discharge.
If no hardness data is available, the permit writer may choose to do an initial evaluation using a
default hardness of 25 mg/L (CaCO3 or (Ca + Mg)). Minimum and maximum limits on the
hardness value used for water quality calculations are 25 mg/L and 400 mg/L, respectively.
If the use of a default hardness value results in a hardness -dependent metal showing reasonable
potential, the permit writer contacts the Permittee and requests 5 site-specific effluent and
upstream hardness samples over a period of one week. The RPA is rerun using the new data.
Page 2 of 4

Permit No.
The overall hardness value used in the water quality calculations is calculated as follows:
Combined Hardness (chronic)
_ (Permitted Flow, cfs *Avg. Effluent Hardness, mg/L) + (s7Q 10, cfs *Avg. Upstream Hardness, mg/L)
(Permitted Flow, cfs + s7Q10, cfs)
The Combined Hardness for acute is the same but the calculation uses the 1Q10 flow.
3. The permit writer converts the numeric standard for each metal of concern to a total recoverable
metal, using the EPA Default Partition Coefficients (DPCs) or site-specific translators, if any
have been developed using federally approved methodology.
EPA default partition coefficients or the "Fraction Dissolved" converts the value for
dissolved metal at laboratory conditions to total recoverable metal at in -stream
ambient conditions. This factor is calculated using the linear partition coefficients
found in The Metals Translator: Guidance for Calculating a Total Recoverable
Permit Limit from a Dissolved Criterion (EPA 823-B-96-007, June 1996) and the
equation:
_Cdiss = 1
Ctotal 1 + { [Kpo] [ss(I+a)] [10"6] }
Where:
ss = in -stream suspended solids concentration [mg/1], minimum of 10 mg/L used,
and
Kpo and a = constants that express the equilibrium relationship between dissolved
and adsorbed forms of metals. A list of constants used for each hardness -dependent
metal can also be found in the RPA program under a sheet labeled DPCs.
4. The numeric standard for each metal of concern is divided by the default partition coefficient (or
site-specific translator) to obtain a Total Recoverable Metal at ambient conditions.
In some cases, where an EPA default partition coefficient translator does not exist (ie. silver), the
dissolved numeric standard for each metal of concern is divided by the EPA conversion factor to
obtain a Total Recoverable Metal at ambient conditions. This method presumes that the metal is
dissolved to the same extent as it was during EPA's criteria development for metals. For more
information on conversion factors see the June, 1996 EPA Translator Guidance Document.
5. The RPA spreadsheet uses a mass balance equation to determine the total allowable concentration
(permit limits) for each pollutant using the following equation:
Ca = (s7010 + Qw) (Cwgs) — (s7410) (Cb)
Qv,
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)
s7Q10 = summer low flow used to protect aquatic life from chronic toxicity and human
health through the consumption of water, fish, and shellfish from noncarcinogens (cfs)
* Discussions are on-going with EPA on how best to address background concentrations
Flows other than s7Q10 may be incorporated as applicable:
IQ 10 = used in the equation to protect aquatic life from acute toxicity
Page 3 of 4

Permit No.
QA = used in the equation to protect human health through the consumption of water,
fish, and shellfish from carcinogens
30Q2 = used in the equation to protect aesthetic quality '
6. The permit writer enters the most recent 2-3 years of effluent data for each pollutant of concern.
Data entered must have been taken within four and one-half years prior to the date of the permit
application (40 CFR 122.21). The RPA spreadsheet estimates the 95th percentile upper
concentration of each pollutant. The Predicted Max concentrations are compared to the Total
allowable concentrations to determine if a permit limit is necessary. If the predicted max exceeds
the acute or chronic Total allowable concentrations, the discharge is considered to show
reasonable potential to violate the water quality standard, and a permit limit (Total allowable
concentration) is included in the permit in accordance with the U.S. EPA Technical Support
Document for Water Quality -Based Toxics Control published in 1991.
7. When appropriate, permit writers develop facility specific compliance schedules in accordance
with the EPA Headquarters Memo dated May 10, 2007 from James Hanlon to Alexis Strauss on
40 CFR 122.47 Compliance Schedule Requirements.
8. The Total Chromium NC WQS was removed and replaced with trivalent chromium and
hexavalent chromium Water Quality Standards. As a cost savings measure, total chromium data
results may be used as a conservative surrogate in cases where there are no analytical results
based on chromium III or VI. In these cases, the projected maximum concentration (95th %) for
total chromium will be compared against water quality standards for chromium III and
chromium VI.
9. Effluent hardness sampling and instream hardness sampling, upstream of the discharge, are
inserted into all permits with facilities monitoring for hardness -dependent metals to ensure the
accuracy of the permit limits and to build a more robust hardness dataset.
10. Hardness and flow values used in the Reasonable Potential Analysis for this permit included:
Parameter
Value
Comments (Data Source)
Average Effluent Hardness (mg/L)
[Total as, CaCO3 or (Ca+Mg)]
r
6' fLUe .1; So,AAJ5 + ,
`'-
vie -r- e-egU e' i 1A -w'+
Average
Average Upstream Hardness (mg/L)
[Total as, CaCO3 or (Ca+Mg)]
7Q 10 summer (cfs)
1Q10 (cfs)
Permitted Flow (MGD)
t 6 _ �
r� f4L ,2Q.T,}c-, T ,,J
3 . rj 0
? (u, V I p%J S F'4 er S({ ec
��9,10
it it L►
4'Wo
Q C-(L,A , i 4 J7f 1, t cA Y (b f
Date: . 14.-V) i
Permit Writer: +
6.o rL- C (LLC C
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Page 4 of 4

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