NC0021156_Permit Issuance_20020314

NPDE:i DOCUWENT SCANNINU COVER SHEET
NPDES Permit:
NC0021156
Mount Holly WWTP
Document Type:
113ermit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Correspondence
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
March 14, 2002
This JcPcument is printed on reuse paper - igazore a.ny
content on the resrerse side

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Michael F. Easley
Governor
William G. Ross, Jr., Secretary
North Carolina Department of Environment and Natural Resources
March 14, 2002
Mr. Jeff Fritts, Deputy Director of Public Works
City of Mount Holly
P.O. Box 4061
Mount Holly,' North Carolina 28120
Dear Mr. Fritts:
Gregory J. Thorpe, Ph.D., Acting Director
Division of Water Quality
Subject: FINAL -- NPDES Permit No. NCO021156
Mount Holly WWTP
Broome Street, Mount Holly
Gaston County
In response to your permit renewal request for the Mount Holly wastewater treatment plant (WWTP),
received February 5, 2001, the Division of Water Quality (the Division) has reviewed your application and
hereby transmits your final permit. Please note that Mount Holly's renewal includes stricter monitoring
frequencies for some parameters appropriate to its reclassification as a Class IV treatment facility.
As part of its review, the Division conducted a Reasonable Potential Analysis (RPA) on 13 potential
toxicants and;metals considering Significant Industrial Users (SIUs), previous monitoring, and this facility's
Pretreatment Program. The RPA evaluates "reasonable potential" for parameters to exceed North Carolina
instream Water Quality Standards. After concluding its renewal evaluation, the Division has revised the
permit and offers the following comments and explanations:
• Instream Monitoring. Based on revised permitting guidance and instream data review, the
Division will no longer require instream monitoring for fecal coliform. Conductivity was
inadvertently removed in the draft permit and has been reinstated for the final permit.
• Concerning MBAS and Cyanide. Cyanide data clearly indicate "reasonable potential" t exceed
the Water Quality Stream Standard. Therefore, this parameter has been added to the permit with a
Daily Maximum limit of 22 µg/L at a monitoring frequency of Weekly. Methylene Blue
Activated Substances (MBAS) effluent data are inconclusive with regard 'to "reasonable
potential. " Therefore, the Division shall require Quarterly monitoring of MBAS based on data
submitted. MBAS is not limited at this time.
• Concerning Your Request to Modify Monitoring for Phenols and Chlorinated Phenolic
Compounds. Based on DMR data submitted, monitoring for both phenols and chlorinated
phenolic compounds has been removed from the permit. However, monitoring for these
compounds shall be relegated to your Pretreatment Program as appropriate to SIUs.
• Concerning 85 % Removal of BOD and TSS. The Division has considered your recent
justification dated June 1, 2001 for the Monthly Average 74 % removal [per 40CFR 133.103 (d)]
required by your previous permit. Data you have submitted do not clearly demonstrate a
consistently less -concentrated effluent, for example, combined stormwater/sewers or an effluent
significantly impacted by excessive inflow and infiltration (III).
NCDENR
N. C. Division of Water Quality 1617 Mail Service Center Raleigh, NC 27699-1617 919-733-7015 Customer Service
1-800-623-7748

City of Mount Holly W WTP
FINAL -- NPDES Permit NC0021156
Page 2
However, should you feel compelled to pursue this issue further, you may wish to submit two or
more years of monthly monitoring data to justify your position. In the absence of such
supporting data, the Division must deny your request and has revised your permit to reflect 85 %
removal, as mandated by federal regulations.
Concerning "Estimated" Results for Total Residual Chlorine. The Division has noted that Total
Residual Chlorine (TRC) values are often estimated on DMRs using the symbol '5" meaning "greater
than." Please be advised that estimating data is a permit violation. It is the permittee's responsibility to
employ appropriate instrumentation or laboratory testing to record accurately all effluent TRC
concentrations to evaluate the acute toxic affects of chlorine on the receiving stream.
Revised Effluent Table and "Total Recoverable" Metals. Although previous analytical
requirements for metals were understood to reflect "total recoverable," the Division has added the word
"total" to the permit -- i.e., Total Copper — to clarify compliance to 40 CFR 122.45(c). Also, please note
that the Division has resorted the permit limits table by "Sample Location" to facilitate operator use (see
permit Effluent Limitations and Monitoring Requirements).
If any parts, measurement frequencies, or 'sampling requirements contained in this permit are
unacceptable, you have the right to an adjudicatory hearing upon written request within thirty (30) days
after receiving this letter. Your request must be in the forth of a written petition, conforming to Chapter
150B of the North Carolina General Statutes, and filed with the office of Administrative Hearings, 6714
Mail Service Center, Raleigh, North Carolina 27699-6714. Unless such a demand is made, this permit shall
be final and binding.
This permit is not transferable except after notifying the Division of Water Quality. The Division may
require modification, or revocation and re -issuance of this permit.
Please notice that this permit does not affect your legal obligation to obtain other permits required by
the Division of Water Quality, the Division of Land Resources, the Coastal Area Management Act, or other
federal or local governments.
If you have questions, or if we can be of further service, please call Joe Corporon at [phone],
extension 597.
&sj,efnfti ned By
David A Goodrich
Gregory J. Thorpe, Ph.D.
Enclosure: NPDES Permit NC0021156
cc: Central Files
Mooresville Regional Office. Water Quality Section
NPDES Unit;
Point Source Compliance and Enforcement Unit
Technical Assistance and Certification Unit
AAc uatic Toxicology Unit

b
NPDES Permit No. NCO021156
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
(NPDES)
In compliance with the provision of North Carolina General Statute 143-215.1, other lawful standards
and regulations promulgated and adopted by the North Carolina Environmental Management
Commission, and the Federal Water Pollution Control Act, as amended,
City of Mount Holly
is hereby authorized to discharge wastewater from a facility located at
Mount Holly DTP
Broome Street, Mount Holly
Gaston County
to receiving waters designated as the Catawba River within the Catawba River Basin,
in accordance with effluent limitations, monitoring requirements, and other
conditions set forth in Parts I, II, III and IV hereof.
This permit shall become effective April 1, 2002.
This permit and authorization to discharge shall expire at midnight February 28, 2005.
Signed this day March 14, 2002.
Original Signed By
David A. Goodrich
Gregory J. Thorpe, Ph.D., Acting Director
Division of Water Quality
By Authority of the Environmental Management Commission

NPDES Permit No. NCO021156
SUPPLEMENT TO PERMIT COVER SHEET
City of Mount Holly
is hereby: authorized:
1. to continue discharging 4.0 MGD of treated domestic and industrial wastewater from an
activated -sludge wastewater treatment facility consisting of:
• manually cleaned influent bar screen,
• dual grit chambers,
i
• instrumented flow measurement,
• flow equalization basin,. -
• three (3) aeration basins with mechanical aeration,
• dual (2)i secondary clarifiers, �1
• dual (2) chlorine contact chambers (with tablet chlorination), �° ^LD!Z-
• four (4) sludge holding tanks
• dual (2); sludge holding tanks (not in use - formerly clarifiers that have been replaced)
• dual (2) sand drying beds (not in use),
located at the Mount Holly WWTP, Broome Street, Mount Holly, Gaston County, and
2. to discharge from said wastewater treatment works through Outfall 001 to the Catawba
River (see attached map), a stream classified as WS-IV CA waters within the Catawba
River Basin.
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70
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77,77
City of Mount Holly Facility
Mm,tHORYWWTP Ucation
Ladhide 35' 16 55" N StateGridAumk F14SE/ MtHolly, NC not W scale
IAq6Ax* 81'0U 35" W Permftm edFlo4.0 MGD
dvIng Catawba River Drahmge Bmhr Catawba Rivu Basua ES Pemit No. NC
0021156
ReaS&�
Str�Clam WS-IV CA Sub-BasbL, 03-08-33 North 17 Gaston County

NPDES Permit No. NCO021156
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
During the period beginning on the effective date of the permit and lasting until expiration, the Permittee
is authorized to discharge through Outfall 001. Such discharges shall be limited and monitored by the
Permittee as specified below:
PARAMETERS ;
r ?
EFFLUENT
LIMITS
MONITORING
REQUIREMENTS
Monthly
Averse
Weekly
Averse
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample
Location'
Flow (MGD)
4.0
Continuous
Recording
I or E
BOD, 5 day, 20°C 2
30.0 mg/L
45.0 mg/L
Daily
Composite
E, I
Total Suspended Residue (TSR)2
30.0 mg/L
45.0 mg/L
Daily
Composite
E, I
NH3 as N
3/Week
Composite
E
Fecal Coliform (geometric mean)
200 / 100 ml
400 / 100 ml
Dailv
Grab
E
Total Residual Chlorine (TRC)
28
Daily
Grab
E
Dissolved Oxygen
Daily
Grab
E
Temperature (°C)
Daily
Grab
E
H3
Daily
Grab
E
Total Nitrogen (NO2 + NO3 + TKN)
Monthly
Composite
E
Total Phosphorus
Monthly
Composite
E
Chronic Toxicity4
Quarterly
Composite
E
MBAS
Quarterly
Composite
E
Total Copper
2/Month
Composite
E
Total Zinc
2/Month
Composite
E
Cyanide
82
22 gA
Weekly
Grab
E
Temperature, °C
Variables
Grab
U, D
Conductivity
Variables
Grab
U, D
Dissolved Oxygen
Variables
Grab
U, D
Table Footnotes:
1. Sample Locations: E — Effluent; I — Influent; U — Upstream at Hwy 27 bridge; D — Downstream, just below Hwy 29n4
bridge.
2. Monthly average effluent concentrations for Biochemical Oxygen Demand (BODS) and TSR shall not exceed 15% of
respective influent values (i.e. the facility shall achieve 85% removal).
3. pH shall not fall below 6.0 nor exceed 9.0 standard units.
4. Chronic Toxicity (Ceriodaphnia) at 6 %; quarterly during February, May, August, and November (See Special
Condition A. (2.)
5. Variable: permittee shall sample upstream and downstream 3/week during summer months of June, July, August, and
September, weekly during the rest of the year.
Units: mg/L = milligrams per liter ml = milliliter NH3 as N = ammonia as nitrogen
µg/L = micrograms per liter BOD = biochemical oxygen demand
Effluent shall contain no floating solids or foam visible in other than trace amounts.

NPDES Permit No. NCO021156
SUPPLEMENT OT EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
SPECIAL CONDITIONS
A. (2.) CHRONIC TOXICITY PERMIT LIMIT (QUARTERLY)
The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality to
Ceriodaphnia dubia at an effluent concentration of 6 %.
The permit holder shall perform at a minimum, guarterly monitoring using test procedures outlined in the "North
Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised February 1998, or subsequent versions or "North
Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised -February 1998) or subsequent versions.
The tests will be performed during the months of February, May, August, and November. Effluent sampling for this
testing shall be performed at the NPDES permitted final effluent discharge below all treatment processes.
If the test procedure, performed as the first test of any single quarter, results in a failure or ChV below the
permit limit, then multiple -concentration testing shall be performed at a minimum, in each of the two following
months, as described in "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised -
February 1998) or subsequent versions.
The chronic value for multiple concentration tests will be determined using the geometric mean of the highest
concentration having no detectable impairment of reproduction or survival and the lowest concentration that does have a
detectable impairment of reproduction or survival. The definition of "detectable impairment," collection methods,
exposure regimes, and further statistical methods are specified in the "North Carolina Phase II Chronic Whole Effluent
Toxicity Test Procedure" (Revised -February 1998) or subsequent versions.
All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge
Monitoring Form (MR-1) for the months in which tests were performed, using the parameter code TGP3B for the
pass/fail results and THP3B for the Chronic Value: Additionally, DWQ Form AT-3 (original) is to be sent to the
following address:
Attention: Environmental Sciences Branch
North Carolina Division of
Water Quality
1621 Mail Service Center
Raleigh, North Carolina 27699-1621
Completed Aquatic Toxicity Test Forms shall be filed with the Environmental Sciences Branch no later than 30
days after the end of the reporting period for which the report is made.
Test data shall be complete, accurate, include all supporting chemical/physical measurements and all
concentration/response data, and be certified by laboratory supervisor and ORC or approved designate signature. Total
residual chlorine of the effluent toxicity sample must be measured and reported if chlorine is employed for disinfection of
the waste stream.
Should there be no discharge from the facility during a month in which toxicity monitoring is required, the
permittee will complete the information located at the top of the aquatic toxicity (AT) test form indicating the facility
name, permit number, pipe number, county, and the month/year of the report with the notation "No Flow" in the
comment area of the form. The report shall be submitted to the Environmental Sciences Branch at the address cited
above.
Should the permittee fail to monitor during a month in which toxicity monitoring is required, monitoring will be
required during the following month. Should any test data from this monitoring requirement or tests performed by the
North Carolina Division of Water Quality indicate potential impacts to the receiving stream, this permit may be re-
opened and modified to include alternate monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control organism
survival, minimum control organism reproduction, and appropriate environmental controls, shall constitute an
invalid test and will require immediate follow-up testing to be completed no later than the last day of the month
following the month of the initial monitoring.

NPDES PERMIT
DRAFT /FINAL
FILE CONTENTS:
Left side:
❑ New Tracking Slip.
Cq Old Tracking Slip.
Right side:
❑ /Streamline Package Sheet
Cq'// Draft Permit Cover Letter.
fJ ,Draft Permit
C� acility Map
Cd -Fact Sheet.
F' Permit Writer's Notes
M/ Staff Report from Region
VOld Permit
Permit Application.
Acknowledgement Letter
❑ ,Permittee Responses
19 Waste Load Allocation
CHECK LIST
Permit No. _(w c �
NPDES Permit Writer:
c (-1Y KJU\) Tf
IN
(to region, only if strea med) t
(add new policy text ummarize major changes to permit)
(order: cover, s ement, map, effluent sheets, special conditions)
(E-Map: Include facility; Outfalls; U and D sample locations)
(document permit writer's issues and re -issue logic)
(if not in Facts Sheet -- chronology, strategy, DMR Review, RPA, etc.)
(as appropriate -- not needed if streamlined)
(Text, Effluent Sheets and Special Conditions)
(New Permit or Renewal; any additional permittee correspondence)
(for Renewal Application, from NPDES Unit)
(to acknowledgement letter, if any)
(reference date; recalculated for current action?)
Note: Italics indicate special conditions not always required or applicable.
a- submitted to �� f t�r (� (moo, V for Peer Review: Date
:_ Peer Review completed by if�l 4 f ��,P/�//�,,� IV Date
a-, Permit Mailed -Mailed Regional Staff t.YWAS,_ by \I CN= Date
[d"Regional Office Review completed by S'k p r Date.
LEI�Additional Review by *3 � ��� lc�iJinitiated Date
Er'�Additional Review completed �� by CAe` ,^/ `/11' c�Y«- [T 17i 1 l on: Date
MXSubmitted to C?(9-CS r 1 .� ,� 1 for Public Notice on : Notice Date
❑ /Updated blic N du'tl % da bases. Date i7(,� Date
1�3'�FINAL submitted to Dave Goodrich for signature on ) � 6-L UA-Mb 2� F� �2 M,p
LEI' Additional Review 1'!/ �i4l �S �� i �� � C -1 AdIgtr,A-

r3i7A
DENR / DWQ / NPDES Unit
FACT SHEET FOR NPDES PERMIT DEVELOPMENT
NPDES Permit No. NCO021156
INTRODUCTION
jJ�
t—
J
City of Mount Holly (also herein referred to as Mount Holly or the permittee) requires a N
Pollutant Discharge Elimination System (NPDES) permit for its Mount Holly Wastewater Tre
Plant (W WTP) to dispose treated wastewater to the surface waters of the state. The permittee's 5-year
NPDES permit is soon to expire and they have requested renewal from the Division of Water Quality
(the Division). This Fact Sheet summarizes background information and rationale used by the
Division's NPDES Unit to determine permit limits and conditions. This document also contains
references to information sources relevant to this permit renewal (superscripted numbers in order of
appearance, See References).
FACILITY RECORDS REVIEW
Facility Description. The Mount Holly WWTP (Table 1) is a 4.0 MGD Publicly Owned Treatment
Works (POTW) utilizing: a manually -cleaned influent bar screen; dual grit chambers; Parchall flume
with instrumented flow measurement; a flow equalization basin; three (3) aeration basins with
mechanical aeration; dual (2) secondary clarifiers; dual (2) chlorine contact chambers; four (4) sludge
holding tanks; [also present but not in use — dual (2) sludge tanks, and duel (2) sand filter beds].'
Table 1. Mount Holly WWTP
Facility Information
Applicant/FacilityApplicant/Facility Name 1,2
City of Mount Holly / Mount Holly WWTP
Applicant Address
P.O. Box 406, 131 South Main Street
Facility Address
P.O. Box 406, Mount Holly, North Carolina 28210
Permitted Flow (MGD)
4.0 (-30 % domestic; —70% industrial)
Type of Waste
Domestic and industrial wastewater. Primary SIC Code 4952;
W W Code Prim 01; Treatment Unit Code 02003;
(residuals applied, Land Application Permit W 0001863)
Facility/Permit Status 1A4Class
III, Major/ Renewal
Drainage Basin / County
Catawba / Gaston Count
Miscellaneous
Receiving Stream 1,2ACatawba
River
Regional Office
Mooresville
Stream Classification
WS-IV CA
State Grid /
USGS Too Quad
F 14 SE /
Mt. Holly, NC
303(d) Listed?
Not listed
Permit Writer
Joe R. Corporon
Subbasin
03-08-33
Date:
08Ma 0l
Drainage Area (sq. mi.)7
2,015
MW
Lat. 35' 15' 55" Long. 81° 00' 35"
Summer 7Q10 (cfs) '
95
Winter 7Q10 (cfs) '
-
30Q2 (cfs) 37
716
Average Flow (cfs)
3016
WC (%) '
6
Fact Sheet
Renewal -- NPDES Permit NCO021156
Page 1

Division records for the City of Mount Holly date from 1978. The most recent permit became
effective on September 1, 1996 and expires at midnight on July 31, 2001. The Division received
prompt documentation to renew (Standard Form A) on February 5, 2001.1'4 Since the issuance of the
last permit, the Division has reclassified this facility from Class III to Class IV, therefore this
renewal includes appropriately stricter compliance and monitoring requirements.
Waste Load Allocation (WLA). The Division prepared the last WLA in April 1996 and developed
effluent limits and monitoring considering an in -stream waste concentration (IWC) of 6 %. The
Division judges these limits and monitoring requirements to be appropriate for this renewal with the
exception of the additions and deletions listed below (see PERMITTING APPROACH SUMMARY).
Verifying Existing Stream Conditions. This facility discharges to the Catawba River,l's a Class WS-
IV CA stream within the Catawba River Basin. This portion of the Catawba River is not listed as an
"impaired" waterbody [not 303(d) listed).6
CORRESPONDENCE
Staff Report. Mooresville Regional Office (MRO) prepared a Staff Report dated March 19, 2001.
The MRO staff found this facility "...in good operational condition..." and recommended "...that this
permit be renewed...." The MRO also noted the permittee's request to remove or diminish
monitoring requirements for phenol and chlorinated phenolic compounds, based on past data
collected and reported.
COMPLIANCE REVIEW
Pretreatment, Compliance -- Notices of Violation (NOVs). Mount Holly's pretreatment program or
Long Term Monitoring Plan was approved in 1996 and was considered during the Reasonable
Potential Analysis.$ However, between 1994 and 1999, this, facility received multiple NOVs related to
its Pretreatment Program including failure to implement the program and failure to submit
pretreatment data. Subsequent Pretreatment Audit Reports indicate that "satisfactory compliance with
the program" was achieved by the end of year 2000.9
Whole Effluent Toxicity (WET) Test. Quarterly monitoring results for Whole Effluent Toxicity
(WET) testing indicates "pass" for the last 17 quarters (January 1997 through February 2001).10,11
DMR Instream and Effluent Data Review. The Division reviewed 27 months (January 1999
through March 2001) of Discharge Monitoring Reports (DMRs). Year 2000 file showed no reports
for January and February; amended reports for May and June; otherwise DMR files appear regular,
thorough, and complete. Total flow for this time period averaged about 2.1 MGD or about 52 % of
permitted capacity. 1
Effluent Chlorine. This facility currently has no Total Residual Chlorine (TRC) limit and it does not
de -chlorinate its effluent a Effluent TRC concentrations averaged about 595 µg/L (based on 27
months of data) with maximums estimated as >1500 µg/L TRC reported regularly since the beginning
of year 2000.11 Considering an Instream Waste Concentration (1WC) of 6%, the Division
recommends that the level of effluent TRC not exceed 277 µg/L to protect against acute toxic effects.
Fact Sheet
Renewal -- N PDES NCO0211 5G
Page 1

Because this facility is neither "new or expanding," the Division will not impose a TRC limit at this
time (considering relatively high dilution), in keeping with current renewal guidance.
The Division will remind the permittee that reporting "estimated" values is a permit violation. The
Division will therefore recommend in the permit cover letter that the permittee discontinue reporting
TRC estimated as "greater than" (>), and to upgrade TRC monitoring equipment or laboratory testing
immediately as appropriate to provide accurate maximum TRC measurements.
Instream Dissolved Oxygen and Temperature. Instream dissolved oxygen (DO) and temperature data
appear reasonable and seasonally appropriate.11 Dissolved oxygen values are above and consistently
compliant with the Stream Standard minimum of 5 mg/L (Table 2).
Table 2. Summer Instream Dissolved Oxygen (June through October)
U stream DO
Downstream DO
Average
Minimum
Average
Minimum
1999
6.7 mgIL
6.0 m
August
6.6 mgIL
6.1 m
Au ust
2000
6.5 m
6.1 m
July/August
6.5 m
5.9 m
Jul
Instream Fecal Coliform. Weekly fecal coliform counts appear similar when comparing data
upstream to downstream (Table 3.). Proportionally similar values upstream and downstream suggest
little or no correlation to this facility's discharge, averaging monthly between 1 and 7 colonies per
100 mi.,,
Table 3. Instream Summer Fecal Coliform Counts (May through October)
1999
Maximum Upstream
Maximum Downstream
May
400*
118
June
760
530
July
470
380
August
800
57
Se tember
90
400
October
420
420
2000
May
57
27
June
270
>600
July
90
190
August
310
110
September
1 580
600
October
1 53
25
* Units: colonies per 100 ml.
Based on these findings and the relatively high dilution of the receiving stream (IWC 6 %), the
Division finds no reason to continue instream monitoring (upstream and downstream) for fecal
coliform, and recommends that it be discontinued.
Fact Sheet
Renewal -- NPDES NC 021156
Page ;

Reasonable Potential Analysis (RPA). The Division conducted EPA -recommended RPA analyses
on 27 months of data" to determine the "reasonable potential" for identified toxicants and metals to
exceed Water Quality Stream Standards. The Division compiled fifteen (15) parameters of concern
listed in the previous permit and pretreatment documents:12 Table 4 summarizes changes based on
Reasonable Potential and sampling conducted under both the permit and the Pretreatment Program.
Table 4. ' Permit Renewal Action Based on Reasonable Potential Analysis
Parameter
Reasonable
Potential?
Previously
Monitored by
Permit?
Permit
Renewal Action
Arsenic
No
No
No Change
Cadmium
No
No
No Change
Chromium
No
No
No Change
Chlorinated
Phenols
No
Yes
Discontinue
Monitoring
Copper
Yes
Yes
No Change
Cyanide
Yes
No
Add with Limits
Lead
No
No
No Change
MBAS
Inconclusive
No
Add Quarterly
Monitoring
Mercury
No
No
No Change
Nickel
No
No
No Change
Phenol
No
Yes
Discontinue
Monitoring
Selenium
No
No
No Change
Zinc
Yes
Yes
No Change
Results suggest no "reasonable potential" for nine (9) of the thirteen (13) parameters analyzed. The
reasonable potential for MBAS is inconclusive, based on submitted data. Only three (3) parameters
therefore indicate "reasonable potential" to exceed Water Quality Stream Standards -- copper,
cyanide, and zinc.
Because Cu and Zn have North Carolina State Action Levels only, they are to be monitored only and
not limited. Phenol monitoring will be discontinued based on reasonable potential, but relegated to
the Pretreatment Program, as appropriate to Mount Holly's Significant Industrial Users (SIUs).
MBAS (Methylene Blue Activated Substances) will be added to the permit at a monitoring frequency
of Quarterly. Finally, 2/Monthly monitoring for cyanide will be added to the permit with a Daily
Maximum limit of 22 µg/L based on reasonable potential.
Fact Sheet
Renewal -- NPDES NCO021156
Page 4

PERMITTING APPROACH SUMMARY
Instream Monitoring Changes
Previous Requirements: Dissolved Oxygen, Fecal Coliform, Conductivity, Temperature.4
Recommended Changes: Discontinue instream fecal coliform (data do not indicate impact)
and monitoring (DWQ no longer considers these data useful to
evaluate streams receiving primarily domestic wastes). Instream
conductivity remains in the permit considering industrial SIUs.
Toxicity Testing
Previous Requirement: Quarterly Chronic Ceriodaphnia dubia Cap effluent conc. of 6 %.4
Recommended Changes: No change recommended.
Effluent Monitoring
Recommended Deletions: Phenols and Chlorinated -phenolic Compounds — discontinue
monitoring (data show no detection / no potential for impact)
Recommended Additions: MBAS — Monitor Quarterly -- no limit
Cyanide — Monitor 2/Monthly with limit of
22 µg/L (Daily Maximum)
82 µg/L (Weekly Average)
Increase monitoring frequencies appropriate for a Class IV facility.
Metals language (monitoring page) shall be altered to include the
word "total" to reflect analysis as "total recoverable," per 40 CFR
122.45(c), as requested by EPA.
PROPOSED SCHEDULE OF ISSUANCE
Draft Permit to Public Notice:
Permit Scheduled to Issue:
NPDES UNIT CONTACT
If you have quest' s r arc
contact Joe Co ron at/919)
NAME:
June 13, 2001.
September 3, 2001
►f the above information or on the attached permit, please
ext. 597.
Fact Sleet
Renewal -- NPDES NUR)21 1 �G
Page 5
ATE:y`

REFERENCES
1. 2001. NPDES Permit Application Standard Form A. City Mount Holly / Mount Holly WWTP,
February 5.
2. 2000. NPDES Regional Staff Report and Recommendations for the Renewal, for the City Mount
Holly / Mount Holly, NPDES Permit No. NC0021156, Mooresville Regional Office,
Samar Bou-Bhazale, May 22.
3. 2000. Active NPDES Permits List, North Carolina Division of Water Quality, NPDES Unit, on
the web at http:/h2o.enr.state.nc.us/NPDES/NPDESweb.html.
4. 1996. NPDES Permit No.N00021156. Issued to City Mount Holly / Mount Holly WWTP
expires July 31, 2001. Copies obtained through The Division of Water Quality, Central
Files, Archdale Building, 512 N. Salisbury St., Raleigh, North Carolina.
5. 1999. Catawba Basinwide Water Quality Plan. North Carolina Division of Water Quality, Water
Quality Section.
6. 2000. 303(d) List of North Carolina Impaired Waters - Draft. North Carolina Division of Water
Quality, Water Quality Section. Copies obtained through Planning Branch, Archdale
Building, 512 N. Salisbury St., Raleigh, North Carolina.
7. 1996. NPDES Waste Load Allocation Work Sheet, NPDES Permit No. NC0021156, for the City
Mount Holly / Mount Holly WWTP (modeled by Jackie Nowell), April 26.
8. 1996 Long Term Monitoring Plan, for Pre-treatment, City Mount Holly / Mount Holly WWTP.
9. 2000. Pretreatment Program Audit Report, City Mount Holly / Mount Holly WWTP, Keyes
McGee, NPDES Pretreatment Unit, October 27.
10. 2001. NPDES Whole Effluent Toxicity Test Results, January 1997 through February 2001,
DENR, Environmental Services Branch, Aquatic Toxicology Unit, March.
11. 1999-2001 Discharge Monitoring Reports (DMR) for Effluent (DEM Form MR-1) and instream monitoring (DEM Form MR-3), City Mount Holly / Mount Holly WWTP, January 1999
through March 2001.
12. 2001 Request for Long Term Monitoring PI City Mount Holly / Mount Holly WWTP, from
Joe Corporon (NPDES Unit) to Keyes McGee (Pretreatment Unit), January 26.
Fact Sheet
Renewal -- NPDES NCO021156
Page 6

J�`teo sr��,s
A UNITED STATES ENVIRONMENTAL PROTECTION AGENCY
REGION 4
o ATLANTA FEDERAL CENTER
: i
t 67FORSYTH STREET
0
1+114 PgOlsd\ ATLANTA, GEORGIA 30303-6960
FED 1 1 2or
Mr. Joe Corporon
North Carolina Department of Environment and
Natural Resources
Division of Water Quality
NPDES Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
SUBJ: NPDES Permit for City of Mount Holly
Permit No. NCO021156
Dear Mr. Corporon:
los
o
[amC�
LL
--
J
o c2
In accordance with the EPA/NCDENR MOA, we have completed review of the permit
referenced above. Based on specifying metals as "total', we have no objections to the proposed
permit conditions. We request that we be afforded an additional review opportunity only if
significant changes are made to the permit prior to issuance, or if valid and significant comments
to the permit are received. Otherwise, please send us one copy of the final permit when issued.
If you have any questions, please call Mr. Marshall Hyatt at [phone].
Sincerely,
. Scott Gordon, Chief
Permits, Grants and Technical Assistance Branch
Water Management Division
Internet Address (URL) . http://www.epa.gov
Recycled/Recyclable. Printed with Vegetable Oil Based Inks on Recycled Paper (Mlnlmum 30% Poslconsumer)

ORMI, 11 1
Fax:[phone] Dec 13 '01 16:20 P.02i02
AMENDMENT TO NPDES PERMIT APPLICATION
r-,
m
C7
In mid-2001 the U.S. Environmental Protection Agency, which oversees North Carolina's
NPDES permit program, determined that the state's application form for major municipal
dischargers is inadequate. The EPA indicated that the form does not require a summary of
the applicant's wastewater characteristics, as EPA's standard form does, and does not
provide the necessary public record for permit issuance. Since July 2001, EPA has obj
rected
to the issuance of approximately forty pertnit renewals until the pertruttees provide complei
applications.
In recent discussions with the Division of Water Quality, the EPA agreed that the Division
may provide the monitoring information on each pennittee's behalf rather than require the
facilities to complete new applications. The peruuttees have already submitted discharge
monitoring reports (DMRs) under the terms of their NPDES permits, and the Division can
easily produce stunmazies for each facility. However, because the Division does not have the
legal authority to amend a facility's application, each pecmince must give consent in order for
the Division to submit this information on its behalf. North Carolina will provide a
summary of discharge monitoring reports as additional documentation to ensure that the
record is complete.
The statement below is designed to give the Division the authority to submit this data on
behalf of the pertnittee for this one instance. Other than signing the statement below,
no further action will be required on the part of the permit holder. Furthermore, this
will not change the substance of the draft permit already issued by the Division.
PLEASE SIGN AND RETURN THE FOLLOWING STATEMENT AS SOON AS
POSSIBLE. THIS STATEMENT WILL CONSTITUTE AN OFFICIAL PERMIT
AMENDMENT. In order to expedite the renewal of your permit, please fax the
signed form to (919)-733-0719 and send the original to:
NCDENR/DWQ/NPDES UNIT
1617 Mail Service Center
Raleigh, NC 27699-1617
Certification of Petmit Application Amendment
"I certify tbat this information, to the best of my knowledge and belief, is true, complete,
and accurate. This information, including any data provided, amends the current application
for re -issuance of NPDES peunit number NC0021156 submitted to the North Carolina
Department of Environment and Natural Resources, Division of Water Quality, on
F'ebma 1 I,
O
Sign; 1 of Permit Holder Date
5411

DENR / DWQ / NPDES Unit
SHEET FOR NPDES PERMIT DEVELOPMENT
NPDES Permit No. NCO021156
INTRODUCTION
City of Mount Holly (also herein referred to as Mount Holly or the permittee) requires a
Pollutant Discharge Elimination System (NPDES) permit for its Mount Holly Wastewater T
o
�
WU
�K
�2
Plant (WWTP) to dispose treated wastewater to the surface waters of the state. The permittee's 5-year
NPDES permit is soon to expire and they have requested renewal from the Division of Water Quality
(the Division). This Fact Sheet summarizes background information and rationale used by the
Division's NPDES Unit to detemune permit limits and conditions. This document also contains
references to information sources relevant to this permit renewal (superscripted numbers in order of
appearance, See References).
FACILITY RECORDS REVIEW
Facility Description. The Mount Holly WWTP (Table 1) is a 4.0 MGD Publicly Owned Treatment
Works (POTW) utilizing: a manually -cleaned influent bar screen; dual grit chambers; Parchall flume
with instrumented flow measurement; a flow equalization basin; three (3) aeration basins with
mechanical aeration; dual (2) secondary clarifiers; dual (2) chlorine contact chambers; four (4) sludge
holding tanks; (also present but not in use -- dual (2) sludge tanks, and duel (2) sand filter beds].[
Table 1. Mount Hollv WWTP
Facility Information
Applicant/Facilit Name '
City of Mount Holly / Mount Holly WWTP
Applicant Address '"
P.O. Box 406, 131 South Main Street
Facility Address '"
P.O. Box 406, Mount Holly, North Carolina 28210
Permitted Flow (MGD)
4.0 (-30 % domestic; —70% industrial)
Type of Waste 1X1
Domestic and industrial wastewater. Primary SIC Code 4952;
WW Code Prim. 01; Treatment Unit Code 02003;
(residuals applied, Land Application Permit WQ0001863)
Facility/Permit /Permit Status '
Class III, Major / Renewal
Drainage Basin / County '
Catawba / Gaston County
Miscellaneous
Receiving Stream '
Catawba River
Regional Office
Mooresville
Stream Classification
WS-IV CA
State Grid /
USGS To o Quad
F 14 SE /
Mt. Holly, NC
303(d) Listed?
Not listed
Permit Writer
Joe R. Corporon
Subbasin 503-08-33
Date:
08Ma 0I
Drainage Area (sq. mi.)7
2,015
Lat. 35° 15' 55" Long. 81° 00' 35"
Summer 7Q10 (cfs)3,795
Winter7Q10(cfs) '
-
30Q2 (cfs) '
716
Avera e Flow (cfs) '
3016
IWC (%)3,76
FOCI Shoat
ttcR. ,�;il -\I'I 11S 1'crmit \('nU"I UG
f9mr I

Division records for the City of Mount Holly date from 1978. The most recent permit became
effective on September 1, 1996 and expires at midnight on July. 31, 2001. The Division received
prompt documentation to renew (Standard Form A) on February 5, 2001.1'4
Waste Load Allocation (WLA). The Division prepared the last WLA in April 1996 and developed
effluent limits and monitoring considering an in -stream waste concentration (IWC) of 6 %. The
Division judges these limits and monitoring requirements to be appropriate for this renewal with the
exception of the additions and deletions listed below (see PERMITTING APPROACH SUMMARY).
Verifying Existing Stream Conditions. This facility discharges to the Catawba River,115 a Class WS-
IV CA stream within the Catawba River Basin. The Catawba River is not listed as an "impaired"
waterbody [not 303(d) listed].6
CORRESPONDENCE
Staff Report. Mooresville Regional Office .(MRO) prepared a Staff Report dated March 19, 2001.
The MRO staff found this facility "...in good operational condition..." and recommended "...that this
permit be renewed...." The MRO also note the permittee's request to remove or diminish monitoring
requirements fo I phenol and chlorinated phenolic compounds, based on past data collected and
reported.
COMPLIANCE REVIEW
Pretreatment Compliance -- Notices of Violation (NOVs). Mount Holly's pretreatment program or
Long Term Monitoring Plan was approved in 1996 and was considered during the Reasonable
Potential Analysis.$ However, between 1994 and 1999, this facility received multiple NOVs related to
its Pretreatment Program including failure to implement the program and failure to submit
pretreatment data. Subsequent Pretreatment Audit Reports indicate that "satisfactory compliance with
the program" was achieved by the end of year 2000.9
Whole Effluent Toxicity (WET) Test. Quarterly monitoring results for Whole Effluent Toxicity
(WET) testing indicates "pass" for the last 17 quarters (January 1997 through February 2001). 10'11
DMR Instream; and Effluent Data Review. The Division reviewed 27 months (January 1999
through March 2001) of Discharge Monitoring Reports (DMRs). Year 2000 file showed no reports
for January and February; amended reports for May and June; otherwise DMR files appear regular,
thorough, and complete. Total flow for this time period averaged about 2.1 MGD or about 52 % of
permitted capacity."
i
Effluent Chlorine. This facility currently has no Total Residual Chlorine (TRC) limit'and it does not
de -chlorinate its effluent.4 Effluent TRC concentrations averaged about 595 µg/L (based on 27
months of data) with maximums estimated as > 1500 µg/L TRC reported regularly since the beginning
of year 2000.11 Considering an Instream Waste Concentration (IWC) of 6%, the Division
recommends that the level of effluent TRC not exceed 277 µg/L to protect against acute toxic effects.
Because this facility is neither "new or expanding," the Division will not impose a TRC limit at this
time (considering relatively high dilution), in keeping with current renewal guidance.
Fac l .shcel
Itcncw.cl -- `PD1:S \C002-1 I-%
I'c!„c, ,

The Division will remind the permittee that reporting "estimated" values is a permit violation. The
Division will therefore recommend in the permit cover letter that the permittee discontinue reporting
TRC estimated as "greater than" (>), and to upgrade TRC monitoring equipment or laboratory testing
immediately as appropriate to provide accurate maximum TRC measurements.
Instream Dissolved Oxygen and Temperature. Instream dissolved oxygen (DO) and temperature data
appear reasonable and seasonally -appropriate." Dissolved oxygen values are above and consistently
compliant with the Stream Standard minimum of 5 mg/L (Table 2).
Table 2. Summer Instream Dissolved Oxygen (June through October)
U stream DO
Downstream DO
Average
Minimum
Average
Minimum
1999
6.7 m /L
6.0 m /L
August
6.6 m
6.1 m
August
2000
1 6.5 m
6.1 mg/1-
July/August
6.5 m
5.9 mgIL
I Jul
Instream Fecal �Coliform. Weekly fecal coliform counts appear similar when comparing data
upstream to downstream (Table 3.). Proportionally similar values upstream and downstream suggest
little or no correlation to this facility's discharge, averaging monthly between 1 and 7 colonies per
100 mi.,,
Table 3. Instream Summer Fecal Coliform Counts (May through October)
1999
Maximum Upstream
Maximum Downstream
May
400*
118
June
760
530
July
470
380
August
800
57
September
90
400
October-
420
420
2000
-May
57
27
June
270
>600
July
90
190
August
310
110
September
580
600
October
53
25
* Units: colonies per 100 ml.
Based on these findings and the relatively high dilution of the receiving stream (IWC 6 %), the
Division finds no reason to continue instream monitoring (upstream and downstream) for fecal
coliform, and recommends that it be discontinued.
Fact Sheet
Rotiew-id -- MIDES W0021 156
Edge ,

.6
Reasonable Potential Analysis (RPA). The Division conducted EPA -recommended RPA analyses
on 27 months of data" to determine the "reasonable potential" for identified toxicants and metals to
exceed Water Quality Stream Standards. The Division compiled fifteen (15) parameters of concern
listed -in the previous permit and pretreatment documents: 12 Table 4 summarizes changes based on
Reasonable Potential and sampling conducted under both the permit and the Pretreatment Program.
Table 4. Permit Renewal Action Based on Reasonable Potential Analysis
Parameter
Reasonable
Potential?
Previously
Monitored by
Permit?
Permit
Renewal Action
Arsenic
No
No
No Change
Cadmium
No
No
No Change
Chromium
No
No
No Change
Chlorinated
Phenols
No
Yes
Discontinue
Monitoring
Copper
Yes
Yes
No Change
Cyanide
Yes
No
Add with Limits
Lead
No
No
No Change
MBAS
Inconclusive '
No
Add Quarterly
Monitoring
Mercury
No
No
No Change
Nickel
No
No
No Change
Phenol
No
Yes
Discontinue
Monitoring
Selenium
No
No
No Change
Zinc
Yes
Yes
No Change
Results suggest no "reasonable potential" for nine (9) of the thirteen (13) parameters analyzed. The
reasonable potential for MBAS is inconclusive, based on submitted data. Only three (3) parameters
therefore indicate "reasonable potential" to exceed Water Quality Stream Standards -- copper,
cyanide, and zinc.
Because Cu and Zn have North Carolina State Action Levels only, they are to be monitored only and
not limited. Phenol monitoring will be discontinued based on reasonable potential, but relegated to
the Pretreatment Program, as appropriate to Mount Holly's Significant Industrial Users (SIUs).
MBAS (Methylene Blue Activated Substances) will be added to the permit at a monitoring frequency
of Quarterly. Finally, cyanide will be added to the permit with limits of 22 µg/L (Daily Maximum)
and 82 µg/L (Weekly Average), based on reasonable potential.
1"act Sheol
Renewal -- NPI)FIS \t'N '21 1-;6
PaLuc ,1

PERMITTING APPROACH SUMMARY
Instream Monitoring Changes
Previous Requirements: Dissolved Oxygen, Fecal Coliform, Conductivity, Temperature 4
Recommended Changes: Discontinue instream fecal coliform and conductivity monitoring.
Toxicitv Testing
Previous Requirement: Quarterly Chronic Ceriodaphnia dubia @ effluent conc. of 6 %
Recommended Changes: No change recommended.
Effluent Monitoring
Recommended Deletions: Phenols and Chlorinated -phenolic Compounds — discontinue
monitoring
Recommended Additions: MBAS — Monitor Quarterly -- no limit J
Cyanide — Monitor emits
22 µg/L (Daily Maximum)
82 µg/L (Weekly Average)
PROPOSED SCHEDULE OF ISSUANCE
Draft Permit to Public Notice: June 13, 2001.
Permit Scheduled to Issue: July 30, 2001
NPDES UNIT CONTACT
If you have questions regarding any of the above information or on the attached permit, please
contact Joe Corporon at [phone] ext. 597.
I'u10 ShcoL
RI.11CM d -- M'DES M'00211 i6
P❑er

REFERENCES
1. 2001. NPDES Permit Application Standard Form A. City Mount Holly / Mount Holly WINTP,
February 5.
2. 2000. NPDES Regional Staff Report and Recommendations for the Renewal, for the City Mount
Holly / Mount Holly, NPDES Permit No. NC0021156, Mooresville Regional Office,
Samar'Bou-Bhazale, May 22.
3. 2000. Active NPDES Permits List, North Carolina Division of Water Quality, NPDES Unit, on
the web at http:/h2o.enr.state.nc.us/NPDES/NPDESweb.html.
4. 1996. NPDES Permit No.NC0021156. Issued to City Mount Holly / Mount Holly WWTP
expires July 31, 2001. Copies obtained through The Division of Water Quality, Central
Files, Archdale Building, 512 N. Salisbury St., Raleigh, North Carolina.
5. 1999. Catawba Basinwide Water Quality Plan. North Carolina Division of Water Quality, Water
Quality Section.
6. 2000. 303(d) List of North Carolina Impaired Waters - Draft. North Carolina Division of Water
Quality, Water Quality Section. Copies obtained through Planning Branch, Archdale
Building, 512 N. Salisbury St., Raleigh, North Carolina.
7. 1996. NPDES Waste Load Allocation Work Sheet. NPDES Permit No. NC0021156, for the City
Mount, Holly / Mount Holly WWTP (modeled by Jackie Nowell), April 26.
8. 1996 Long Term Monitoring_ Plan, for Pre-treatment, City Mount Holly / Mount Holly WWTP.
9. 2000. Pretreatment Program Audit Report, City Mount Holly / Mount Holly WWTP, Keyes
McGee, NPDES Pretreatment Unit, October 27.
10. 2001. NPDES Whole Effluent Toxicity Test Results, January 1997 through February 2001,
DENR, Environmental Services Branch, Aquatic Toxicology Unit, March.
11. 1999-2001. Discharge Monitoring Reports (DMR) for Effluent (DEM Form MR-1) and instream
monitoring (DEM Form MR-3), City Mount Holly / Mount Holly WWTP, January 1999
through March 2001.
12. 2001 Request for Long Term Monitoring Plan, City Mount Holly / Mount Holly WWTP, from
Joe Corporon (NPDES Unit) to Keyes McGee (Pretreatment Unit), January 26.
Fact Sheet
1)auC 0

Regional Office Comments
e �ti1si7:Ur+c���� �GLow C?nVajY s72vmE,1AL
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TE: ! —,/ t�► 0
REGIONAL
NPDES SUPERVISOR: DATE:
Pace Shctl.
I:ruc��,J -- \PDP.S W00211 �A
Pasc 7

7ul 20 01 02:01p
R-: CFtvf�p
N�rS Jo�tT
AI( -
Frank McLean, Maya
Jim Hope, Councilman
Phyllis Hams, Councilwoman
Michael Helms, Councilman
July 19, 2001
City of Mount Holly
131 South Main Street
Post Office Box 406
Mount Holly, North Carolina 28120
Phone: Q04) 827.3931 Fax [phone]
Mr. Joe Corporon
North Carolina Division of Water Quality
1617 Mail Service Center
Raleigh, NC 27699-1617
Subject: City of Mount Holly
NCO021156
Gaston County
Dear Mr. Corporon:
p.2
Robert D. Black, Mayor Pro Tem
Bryan Hough. Councilman
Pal Hubbard, Councilmman
David Kraus, City Manager
Mount Holly is submitting the following concerns in response to your request to
provide comments about our draft NPDES Permit. We hope to talk with you personally
about these matters in the near future. Mount Holly appreciates the proposed reduction
of some of the monitoring requirements included in the draft. We can use these cost
savings on our wastewater treatment and continued compliance with the permit
requirements.
We have previously discussed the proposed requirement for 85% removal of
BOD and TSS. I am confident that our wastewater qualifies as a "less concentrated
influent". We have previously demonstrated this as is evidenced by our current permit
only requiring 74%. What additional data would you like to see to document our less
concentrated influent? The 85% requirement will essentially lower our limit from the
proposed 30 mg/l to approximately 12 —15 mg/l. In essence, we could meet all of our
monthly effluent limits and still fall out of compliance with the 85% reduction rule.
I believe we can meet the proposed cyanide limits much of the time. However, I
would prefer a monthly average since the proposed moni oring frequency is twice per
month. I think the proposal intended for a daily max o 82 gl1 an 22 g/l for a weekly
average, although the proposal lists 82 ug/l as the weekly verage 22 ug/I as the daily
maximum. Using a monthly average instead would help s avoi eking a sample one
week. Since we may have only one sample for the we w uld be in compliance for
the daily but out for the weekly.
Via
�&c F-( A-L
�:s rSaT N W �i4 zFZ.z. D R

Jul 20 01 02:01p p.3
Is the requirement for a Dissolved Oxygen limit of 6.0 mg/1 or greater necessary? FZ
It is not a pan of our current permit; our instream data does not indicate a negative impact p
to the receiving waters; and we are less than a 69/o contribution of the Catawba River. f
The contribution percentage is based on 7Q10 flow in the river and a permitted flow of
MGD. We currently average approximately 2.5 MGD discharging to the river with a
flow consistently above the 7Q10. If we need to meet the 6.0-mg/1 limit, we would need
to request additional time for compliance so we may hire engineers to make the
appropriate adjustments to our wastewater treatment plant.
As a more minor note, the SPECIAL CONDITIONS A.(2.) pertaining to toxicity
monitoring requires a testing concentration of 6% whereas the permit limits page
indicates a testingconcentration of 9%. a
� s ��`�
Thank you for your time and consideration. The City appreciates your assistance
in addressing these issues to foster a final permit that protects the receiving waters while
allowing resources to be allocated to factors that provide the most positive results. Plcase
contact me at [phone] to allow me to provide such information as may be helpful.
Sincerely, i
Jeff Fritts
Deputy Director of Public Works
David Kraus
City Manager

Jul 31 '01 9:26 P.02/02
WATER POLLUTION CONTROL SYSTEM OPERATORS
CERTIFICATION COMMISSION
'CLASSIFICATION
NAME OF FACILTTY:
MAILING ADDRESS: 612� 2 y Za �p G
COUNTY: 6>/YS T 0 A_1
CONTACT PERSON: IFEr CR, 1`Z' TELEPHONE: (7o r 3
PERMIT NO: 1) 5 L Check One: NC .y WQ — HEALTH DP_,
ORC: lorME3 6FAfYs TELEPHONE:
RATING INFORMATION: (Before completing this section, please refer to pages 2-4)
PERMITTED FLOW: , 0 MGD BNR? YES _ NO
CHECK CLASSIFICATION: WASTEWATER: 1 2 _ 3 _ 4
COLLECTION: 1 2 — 3 _.V 4/—
SPRAY IRRIGATION SUBSURFACE LAND APPLICATION V
PHYSICAL/CHEMICAL GRADE I GRADE 11 (9940 Fl-
RATED BY: Qma, Soo- C",&Lr REGION: Mom— DATE: % -/ Z - o
REGIONAL OFFICE TELEPHONE NUMBER: (74 )) 66 3 -1 q 1 EXT: z-'Z S

T-

Justification for Special Consideration
For Less Concentrated Influent Wastewater
(40 CFR Section 133.103(d))
City of Mount Holly POTW has consistently met its limits as shown in previously
submitted'iDMR's. With the current permit requirements and static conditions at the
POTW, the City will continue to meet its limits. The City is in a growth phase at this
time and the conditions at the plant may not remain static. Although the City will make
every effort to meet the conditions of the permit, it is not known exactly how our aging
plant will respond to increased loading.
Our current limits for BOD and TSS are 30 mg/l each. February 2001 was a relatively
dry month so I would like to use it for a contemporaneous example. Average influent
BOD was 156 mg/l. 85% removal would require an effluent concentration of 23.4 mg/l.
That represents a 22% reduction in our effluent requirement. The average influent TSS
was 136 mg/l. 85% removal would require an effluent concentration of 20.4 mg/l — a
32% reduction in our effluent requirement. Each of these are significantly more stringent
limitations than would be required by concentration -based standards.
The less concentrated influent is not the result of excessive I/I. The average POTW flow
for 2000 was 2.38 MGD. With a population of 9,306 our flow is approximately 256
gallons per capita per day. This is less than the 275 gallon per capita per day criterion for
non -excessive I/I.
1tP1Ca,*'t(AG4.-j I
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Mil c()("30_s- T PA_�A
D� scc.�g�A) G�
6 ICC 4(19:57

PUBLIC NOTICE
STATE OF NORTH
to Z
�.,
CAR06-4;t'
ENVIRONMENTAL
L r.
MANAGEMENT COMMIS
61,GJ/D It
1 0 N
/ NPDES UNIT
1617 MAIL SERVICE CENTER
2769F
RALEI617
H,
AFFIDAVIT OF INSERTION OF ADVERTISMEP
IO INTENT
NOTIFICATION OF INTENT
NOTIFICATION
The Gaston Gazette
TO ISSUE A
WASTEWATER PERMITPDES
On the basis of thorough staff
review and application of NC
General Statute 143.21, Public
law 92-500 and other lawful
standards and regulations, the
Nonh Carolina Environmental
Gastonia NC
�
Management Commission pro-
poses to issue a National Pollu-
Gaston County
tante Elimination Sy -
ere NsPDES) wastewater CIS -
charge permit to the persons)
listed below effective 45 days
from the publish date of this no-
tice.
I, SHEILA RANBURGER Legal Advertising Manager of the The Gaston Gazett Written comments regarding
do certify that the advertisement of NCDENR the proposed permit will be ac-
cepted PUBLIC NOTICE — WASTEWATER public date 3o days aver me
commdate of This prior to All
comments received prior to that
date are considered in the final
determinations regarding the
proposed permit. The Director
of the NC Division of Water
Quality may decide to hold a
pudic meeting for the proposed
permit should the Division re -
carve a significant degree of
Measuring 8.53 Inches appeared in The Gaston Gazette, a newspaper published in public interest.
Gaston County, Gastonia, NC, in issues
JUNE 12, 2001
SHEILA RANBURGER
Legal Advertising Manager.
Sworn to and subscribed before me this � day ct 2001
_&Lt
Notary Public
My commission expires May 25, 2003
Copies of the draft permit and
other supporting information on
file used to determine condi-
tions present in the draft permit
are available upon request and
payment of the costs of repro-
duction. Mail comments andlor
requests for information to the
NC Division of Water Quality at
the above address or call Ms.
Christie Jackson at
[phone] extension 538.
Please Include the NPDES per
mh number (attached) in ant
communication. Interested per
sans may also visit the Divisior
of Water Quality at 512 N
Salisbury Street, Raleigh, NC
27604-1148 between the hour.
of 8:00 a.m. and 5:00 p.m. b
review information on file.
NPDES Permit Numbe
NC0021156. Mount Nally, Cit
of - WWTP, PO Box 406, M
Holly, NC 28120 has applied fc
a permit renewal for a facility Ic
cated in Gaston Count
discharging treated wastewatE
into Catawba River in the CE
tawba River Basin. Current)
cyanide and vaious metals ar
water quality limited. This di:
charge may affect future allot
tans in the portion of the r,
carving stream.
1CJune 12, 2001
a 115/ol
S

e
t.
F15WA
TELEPHONE RECORD
,&Tj2i
Date: �jV Project: t`�u.. w WT
NCDENR 'q�,
Time:
'e- r
El Return Mr Mrs. Representing. 7Y
ElCall to Address
Call from
Telephone: 3� t� r �T� ( FAX:
Subject:
NOTES/ SUMMARY
NEEDED FOLL W-UP A N(S) BY WHOM/WHEN
� C Iu� V� G&)Z- " - bQ' U%T00' A& ?�
�D�l
❑
cc:
Signed

MECKLENBURG COUNTY
Department of Environmental Protection
July 9, 2001
Mr. Joe Corporon
North Carolina Department of Environment & Natural Resources
Division of Water Quality
1617 Mail Service Center
Raleigh, NC 27699-1617
Subject: NPDES Permit Renewal NCO021156
Mt. Holly WWTP
Gaston County
Dear Mr. Corporon:
N
' 0
="u
N
[t
The Mecklenburg County Department of Environmental Protection (MCDEP) has reviewed the
subject NPDES permit, which expires on July 31, 2001. The purpose of this correspondence is
to provide you with relevant information regarding the proposed permit renewal.
For approximately 25 years, MCDEP has routinely monitored Lake Wylie by collecting samples
for chemical and biological analysis. As part of our monitoring program, we routinely collect
samples in Lake Wylie to be analyzed for fecal coliform bacteria downstream of various point -
source discharges, such as the Mt. Holly WWTP. These samples are analyzed by the
Mecklenburg County Health Department Laboratory, which is certified for this analysis by North
Carolina.
In July 1998, our sampling below the Mt. Holly WWTP discharge began revealing sporadic high
results, often greater than 300 colonies/ per 100 nil. For your information I have attached a
summary of our sampling results from below the Mt. Holly WWTP discharge, in comparison
with other points along Lake Wylie. When discussing this matter with Mt. Holly officials and
the Division of Water Quality staff, it appears that Mt. Holly routinely complies with their
NPDES monthly and weekly permit limits for fecal coliform, although they may have high daily
values on a regular basis.
As you know, this portion of Lake Wylie is classified as WS-IV. Not only is it heavily relied
upon for drinking water, it is widely used for swimming, boating and fishing. Based upon these
factors and the attached water quality data, MCDEP respectfully request that the Mt. Holly
WWTP effluent limitations be modified to include a daily maximum limit for fecal coliform
bacteria. It is our opinion that the current monthly and weekly average limitation in the permit
CHAR"
USA
PEOPLE • PRIDE • PROGRESS
700 N. Tryon Street • Suite 205 • Charlotte, NC 28202-2236 • [phone] • Fax [phone]
www.co.raeck1enburg.nc.us/coenv
r

d
Mr. Joe Corporon
Mt. Holly WWTP NPDES Permit Renewal
July 9, 2001
Page 2
does not provide adequate public health protection. Furthermore it is our opinion that any point
source discharge into water classified as "suitable for prolonged human contact" should have
g p g
daily effluent fecal coliform limits. Thank you very much for your consideration of this
important matter. If you have any questions, please feel free to contact me at 704/336-5449.
Sincerely,
Wate'rVt lift' Program Manager
RSR/dmc
CC: David Caldwell- MCDEP
Mike McLaurin- Lake Wylie Marine Commission

Fecal Coliform Bacteria (coIJ100 ml)
Upper Lake Wylie
In Lake at the
Below
Dutchman's
Mt. Holly WVVrP
MI Dam
Creek
Outfall
Date
LW 6
LW 5
WF72
27-Mar-96
15
370
09-May-96
5
290
06-Jun-96
<
5
5
11-Jul-96
5
15
06 Aug-96
10
160
10-Sep-96
15
25
03-Oct 96
<
5
50
18-Dec-96
25
5
18-Jun-97
20
360
22-Jul-97
<
5
15
07 Aug-97
20
75
08-Sep-97
<
5
25
20-Nov-97
20
15
08-Jan-98
<
5
300
17-Mar-98
5
160
06-May-98
<
5
< 5
30
04-Jun-98
20
< 5
> 720
09-Jul-98
<
5
5
> 300
27-Aug-98
15
< 5
100
09-Sep-98
<
5
10
> 335
10-Nov-98
<
5
75
1-Jan-99
35
35
04-Mar-99
<
5
270
�1-May-99
1�O-Jun-99
5
270
<
5
30
> 300
21-Jul-99
<
5
65
20
04 Aug-99
15
25
450
13-Sep-99
<
5
55
> 300
01-Nov-99
<
5
5
> 300
02-Dec-99
> 300
22-Dec-99
> 300
05-Jan-2000
5
860
70
07-Feb-2000
150
16-Feb-2000
70
02-Mar-2000
<
5
60
> 300
17-May-2000
<
.5
140
25
20-Jul-2000
14-Aug-2000
<
5
10
55
14Sep-2000
<
5
< 5
20
02-Nov-2000
5
50
125
11-Jan-2001
<
5
10
510
28-Mar-2001
<
5
20
1100
19-Apr-2001
47
23-May-2001
5
300
100
18-Jun-2001
<
5
40
70

t r
State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
Michael F. Easley, Governor
William G. Ross, Jr., Secretary
Kerr T. Stevens, Director
June 6, 2001
MEMORANDUM
Britt Setzer
NY DI:NR / DEH / Regional Engineer
Nlooresville Regional Office
From: Joe Corporon
NPDES Unit
Subject: Review of Draft NPDES Permit NCO021156
City of Mount Holly — Broome Street W WTP
Gaston County
LEONIA
i� III,
NCDENR
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
NC DEPT. OF ENVIRONMENT
AND NATURAL RESOURCES
MOORESVILLEREGONAL OFFICE
rJUN 1 8 2001
Please indicate below your agency's position or viewpoint on the draft permit and return this form by
July 6, 2001. If you have any questions on the draft permit, please contact me at the telephone number
or e-mail address listed at the bottom of this page.
RESPONSE: (Check one)
Concur with the issuance of this permit provided the facility is operated and maintained properly,
stated effluent limits are met prior to discharge, and the discharge does not a a
water quality standards.
Concurs with issuance of the above permit, provided the following conditions ar - : 00
Zz c
C�O,
rn A
AC �
yr
Opposes the issuance of the above permit, based on reasons stated below, or atta Iq¢� t�
c_= J
Signe
1617 Mail Service Center, Raleigh, North Carolina 27699.1617 919 733-5083, extension 597 (fax) 919 733-0719
VISIT US ON THE INTERNET@http:/Rt2o.enr.state.rtc.us/NPDES Joe.Corporon0 ocmail.net
the

REASONABLE POTENTIAL ANALYSIS
City of Mount Holly
Mount Holly WWTP
NCO021156
Time Period Jan 1999 thru Mar 2001
Ow (MGD) 4
7010S (chs) 95
3002 (cf l 716
Avg. Shaver, Flow, OA (ds) 3016 (a caaval
Radiant, Stream Catawba River
<< For
WWTP Class 3
I WC (%) ® 7010S 6.1
0 3002 0.9
0 OA 0.2
Stream Class WS-IV
Summary for 4.0 MGD
See RED TAB (cell Al).
All values in micrograms per titer (ugIL)
STANDARDS&
REASONABLE
PR LIMINARY
COMMENTS
PARAMETER
TYPE'
CRITERIA
POL
POTENTIAL
ESULTS
RECOMMENDED ACTION
NO = not detected
NCWOS R FAY
RESULTS
a.10
MaxPr Cw <c Allowable Cw
Reasonable Potential=No
Arsenic
NO
5a
Max Pend Cw 2.5
No limit or monitoring necessary in NPDES permit.
NO
Allowable Cw (acute) WA
MONITOR?
Monitoring may still be required under -IMP.
Allowable Oa(clandol $16
MONITOR?
..B
M FredCw«Allaweble Cw
Reasonable potential =No
Cadmium
NO
2 Is
1
Meopred Cw 1.0
No limit or mmltMngnecesa, in NPDES permit.
ND
Nlo cable Cw iodate) 15
MONITOR?
Moritoliag sdll required under LIMP,
Alovable Cw(chrenk) W
MONITOR?
n.22
MwPboCW«Movable Cw
Rotatonabla potential =No
Chromium
NC
51 I'M
5
Max PROCw 4B
No limit or monitorngnecessary, In NPDES permit
NO
Alloall C.(adala) 1.022
MONITOR?
Monitoring still required under LTMP.
Allowable CW(dlrenk) 816
MONITOR?
n.54
MaxPWCW> Action Led
Reasonable Potential = YES
Copper
NC
7 73
2
Max Pred Cw n
Caminae monitoring LMonth
PU
Allowable Cw ("a) 7
DAILY MAX. LIMIT
No limit at "a time since no standard in place.
Allowable Cw(cllrenk) 114
MONITOR?
n.21
Max redCw< Alowable Cw
Reasonable Potential ::No
MBAS
NC
Sr,
Max Pred Cw 1717
(excluding data otaire'1 see uga. in Nay00-)
AlbweMe C.(al WA
MONITOR?
Continue monitoring Ouarlerly
Allowable Cw(cmmvk) ate(
MONITOR?
basetl on repoded data
n.24
MaxPreIX.W< Allocable Cw
Reasonable potential =No
Lead
NC
2S 3a4
5
Max Pred Cw 19
No limit or monllolingnecesvary In NPDES pemmt
Allocable Cw(acui 36
MONITOR?
Montanan still required under LTMP.
Allowable Cv,(chm ic) 408
MONITOR?
n.22
MexPmdCw>>12 FAV
Reasanable"FintaleYES
Cyanide
NO
s a
02
331
Set May Max.limit �gi-
IMeroPoidCw
Nbvable Cw (acute) 22
DAILY MAX. LIMIT
Set Weekly Avenge unit
Allocable C.(chrenk) 82
WK. AVG. OMIT
Require monitoring Month
n.25
MaxPredCa,< Allowable Cw
Reasonable Potential =No
Nickel
NO
M all
s
Cw 107
No limit or monitoringneceasary In NPDES permit.
INZIMP=e Cw (sale) 281
MONITOR?
Monitoring sell mqulretlunder LTMP.
Allocable Cw(chrdnk) 1,436
MONITOR?
n=0
la,
Max Prod Lw QNM
Allowable CW(down WA
NO DATA
Allowable CW(chmrlb) ErmrMType
NO DATA
n.9
Maxpredcw=NCw0S
Reasonable potential=No
Selenium
NO
So
5
Max Pred Cw 2.5
0M and 1997 also ND; ftnefore m17)
NO
Allowable C.(acule) WA
MONITOR?
No limit or monitoringnecessary in NPDES permit.
Allowable Cw (chrmk) Bra
MONITOR?
Monitoring still required under LTMP.
n.9
MaxPreiQ Action Level
ReasonablapolenIal=No
Mercury
NO
0.2 to
02
Max Pied Cw G2G7
(1996 and 1997 also NO; tlwrelore z17)
NO
IAD
Allowable Cw (acute) 1.23
MONITOR?
No limit or monitoringneces dory In NPDES penm8.
Allowable Cw (chronic) 0.196
WK. AVG. LIMIT
Monilorng still rebuked under LTMP.
n.eDWM
M.PredOw«NCWOS
Reafoneblopormial=No (NDInl06sanples)
Chlorinated Phenol
NC
I e?
Io
Max Pad Cw
No limit or monlumingradedeary In NPDES Work,
NO
IA0
Allowable(acute) 67 Cw (ac67
0DIW01
based an high cilulkn and good olekrlce TP to Wintake
Allowable Cw(chad ) IB
MDIVI01
Monitor as appropriate under LTMP.
n.52
Ma%PredCw«NCw05
Reasonable Potential= No(crllede eathetic only)
Phenol
A
sn
10
Max Pad CW ad
No limit or monnoringnecessary in NPDES rabbet
Allowable Cw (acute) WA
MONITOR?
based on Ngh dilution and goad distance to WTP Intake
Allowable Cw (chronic) 146,235
MONITOR?
Monitor as aWropdale under LTMP.
n.44
MaxPrel> Moon Level
Reasonable potential=YES
Zinc
NC
sd n
10
Max Pred Cw US
Continue monitoring Worth
(W
Allowable Cw (acute) 67
DAILY MAX. LIMIT
No limit at able time since no standard In pace.
Allocable Cw (chronic) We
MONITOR?
'Legend.
C= Carcinogenic
NO = Non-camindgenlc
A= Aesthetic
Freshwater Discharge
ND = Not Detected
(ug21= All values in micrograms per liter
b6
g2
RPA-Mount Holly, X. MGD
WWI

dk
REASONABLE POTENTIAL ANALYSIS
Parameter
lArsenic
lCadmium
ug/L
ugIL
n
Date Data
BDL--1/2DL
Results
n
Date Data
BDL--1/2DL
Results
I
Jan-99 <
Std Dev.
0.00
1
Jan-99 <
Std Dev.
0.00
2
Jan-99 <
Moan
2.5
2
Jan-99 <
Mean
1.0
3
Jan-99 <
C.V.
0.000
3
Feb-99 <
2
C.V.
0.000
4
Jan-99 <
n
10
4
Feb-99 <
n
8
5
Feb-99 <
5.0
2.5
5
Mar-99 <
6
Feb-99 <
Mutt Factor =
1.00
. 6
Mar-99 <
Mutt Factor =
1.00
7
Feb-99 <
Max. Value
2.5 #0
:
c 7
Apr-99 <
Max. Value
1.0
8
Feb-99 <
Max. Prod Cw
2.5 po
8
Apr-99 <
Max. Prod Cw
1.0
9
Mar-99
9
May-99 <
2
1.0
10
Mar-99 <
10
May-99 <
11
Mar-99
11
Jun-99 <
12
Mar-09 <
12
Jun-99 <
13
Apr-99 <
13
Jul-99 <
14
Apr-99 <
14
Jul-99
15
Apr-99 <
15
Aug-99 <
2
1.0
16
Apr-99 <
16
Aug-99
17
May-99 <
5.0
2.5
17
Sep-99
18
May-99 <
18
Sep-99
19
May-99 <
19
Oct-99 <
20
May-99 <
20
Oct-99
21
Jun-99 <
21
Nov-99 <
2
1.0
22
Jun-99 <
22
Nov-99
23
Jun-W <
23
Dec-99
24
Jun-99 <
24
Dec-99
25
Jul-99 <
25
Jan-00 <
26
Jul-99
26
Jan-00
27
Jul-99 <
27
Feb-00 <
2
1
28
Jul-99 <
28
Feb-00
29
Aug-99 <
29
Mar-00
30
Aug-99 <
5.0
2.5
30
Mar-00
31
Aug-99 <
31
Apr­00
32
Aug-99 <
32
Apr-00
33
Sep-99 <
33
May-00 <
2
1
34
Sep-99
34
May-00
35
Sep-99 <
35
Jun-00
36
Sep-99
36
Jun-W
37
Oct-99
37
Jul-00
38
Oct-99 <
38
Jul-00 <
39
Oct-99 <
39
Aug-00
40
Oct-99 <
40
Aug-00 <
2
1
41
Nov-99
41
Sep-00
42
Nov-99
42
Sep-00
43
Nov-09 <
5.0
2.5
43
Oct-00
44
Nov-99 <
44
Oct-00
45
Dec-99
45
Nov-00 <
2
1
46
Dec-99 <
46
Nov-00
47
Dec-99
47
Dec-00 <
48
Dec-99
48
Dec-00
49
Jan-00 <
49
50
Jan-00 <
so
51
Jan-00 <
51
52
Jan-00 <
52
53
Feb-00 <
5.0
2.5
63
54
Feb-00 <
54
55
Feb-00 <
55
56
Feb-00 <
56
57
Mar-00 <
6.0
2.5
57
58
Mar-00 <
58
59
Mar-00
59
60
Mar-00 <
60
61
Apr-00 <
61
62
Apr­00
62
63
Apr­00
63
64
Apr-00
64
65
May-00
65
66
May -OD
66
67
May-00 <
5.0
2.5
67
68
May-00 <
68
69
Jun-00
69
70
Jun-00 <
70
RPA --Mount Holly, Data Sheet
5/24101

.
REASONABLE POTENTIAL ANALYSIS
Parameters lChrorniurn,
::
Parameter= lCopper
n
Date
Data
BDL-1/2DL
Results
n
Date
Data
BDL-I/2DL
Results
1
Jan-99
10
Std Dev.
5.76
1
Jan-99
11
11
Std Dev.
2
Jan-99
Mean
16.1
2
Jan-99
15
15
Mean
3
Feb-99
C.V.
0.357
3
Feb-99
8
8
C.V.
4
Feb-99
16
n
22
4
Feb-99
13
13
n
5
Mar-1l9
5
Mar-99
7
7
6
Man99
12
Mult Factor =
1.65
6
Mar-99
10
10
Mult Factor =
7
Apri 39
Max. Value
29.000 W ; `.
7
Apr-99
18
18
Max. Value
8
Apr=09
22
22
Max. Pred Cw
47.860 W
8
Apr-99
16
16
Max. Pred Cw
9
May$9
9
May-99
12
12
10
May,,
20
20
10
May-99
9
9
11
JuM89
11
Jun-99
24
24
12
Jun=g9
28
28
12
Jun-99
16
16
13
JuN99
13
Jul-99
9
9
14
Jul-99
13
13
14
Jul-99
9
9
15
Aug-99
15
Aug-99
14
14
16
Aug-99
12
12
16
Aug-99
7
7
17
Sep•99
17
Sep-99
11
11
18
Sep-09
15
15
18
Sep-99
11
11
19
Oct-99
19
Oct-99
27
27
20
Oct,99
13
13
20
Oct-99
13
13
21
Nov-99
21
Nov-99
29
29
22
Nov-99
14
14
22
Nov-99
14
14
23
Dec-99
23
Dec-99
5
5
24
Dec-W
13
13
24
Dec-99
25
25
25
Jan-0
10
10
25
Jan-00
8.6
8.6
26
Jan-00
10
10
26
Jan-00
17
17
27
Feb-00
27
Feb-00
16
16
28
Feb-00
28
Feb •00
14
14
29
Mar-00
15
15
29
Mar-00
12
12
30
Mar-00
30
Mar-00
49
49
31
Apr.
14
14
31
Apr-00
45
45
32
AprO
32
Apr-00
18
18
33
May-I;iO
29
29
33
May-00
32
32
34
May-�¢0
34
May-00
11
11
35
Jun-00
17
17
35
Jun-00
11
11
36
Jun -do
36
Jun-00
19
19
37
Jul-00
37
Jul-00
12
12
38
Jul-00
12
12
38
Jul-00
13
13
39
Aug-60
14
14
39
Aug-00
15
15
40
Aug-d0
40
Aug-00
15
15
41
Se00
41
Sep-00
30
30
42
Sep-00
42
Sep -00
20
20
43
Oct-00
43
Oct-00
22
22
44
Oct-00
24
24
44
Oct-00
17
17
45
Nov
45
Nov-00
22
22
46
Nov
12
12
46
Nov-00
31
31
47
Dec
47
Deo-00
19
19
48
Dec00
48
Dec
18
18
49
49
Jan-01
14
14
50
50
Jan-01
11
11
51
51
Feb-01
20
20
52
52
Feb-01
15
15
53
53
Mar-01
13
13
54
54
Mar-01
17
17
55
55
56
56
57
57
58
58
59
59
60
60
61
61
62
62
63
63
64
64
65
65
66
66
67
67
68
68
69
69
70
70
8.66
16.8
0.514
54
1.57
49.0
76.9
RPA --Mount Holly, Data Sheet
-3- 5/24/01

• REASONABLE POTENTIAL ANALYSIS
Parameter= IMBAS ;:;:Parameter ILead
n Date Data BDL_1/2DL Results n Date Data BDL=1/2DL Results
1
JaIg <
Std Dev.
165.05
2
Jan 9 <
Mean
281.86
3
Jan-09 <
C.V.
0.586
4
Feb-99 377 377
n
21
5
Feb-09 <
6
Mar499 <
Mult Factor =
2.23
7
Mar+,i�9 <
Max. Value
770.0 pg/I
8
Apr-99 <
Max. Prod Cw
1717.1 po
9
Apr-99 <
10
May-99 <
11
May-99 325 325
12
Jun-99
13
Jun-99
14
Jul-99
15
Jul-99 <
16
Aug-09 349 349
17
Aug-99 <
18
Sep-99 <
19
SOP-99
20
Oct-"
21
Oct-99
22
Nov-99
23
Nov-99 214 214
24
Dec99
25
Dec99
26
Jan-60
27
Jan-00
28
Feb-00 770 770
29
Feb-90
30
Mar-00
31
Mar-00
32
Apr-00
33
Apr-00
34
May-00 130 130
35
May-00
36
Jun-00
37
Jun -OD
38
Jul-00
39
Jul-00
40
Aug-00
41
Aug-00 490 490
42
Sep-00
43
Sep-0p
44
Oct-0
45
Oct-ob
46
Nov-0b
47
Nov -Op 480 480
48
Dec-Ob
49
DecOb
50
Jan-01
51
Jan-01
52
Feb-01 400 400
53
Feb-01
54
Mar-01
55
Mar-01
56
Jan-96
57
Feb-96 280 280
58
Mar-99
59
Apr-96
60
May-96 120 120
61
Jun-96
62
Jul-CJ6
63
Aug-9� 280 280
64
Sep-96
65
Oct-96
66
Nov-95 160 160
67
Dec-96
68
Jan-97
69
Feb-97 180 180
70
Mar-97
71
Apr-97
72
May-97 180 180
73
Jun-97
74
Jul-97
75
Aug-97 240 240
76
Sep-97
77
Oct-97
78
Nov-97 190 190
79
Dec-97
l
-9-
1
Jan-99
Std Dev.
1.30
2
Jan-99 <
3
1.5
Mean
1.7
3
Feb-99 <
3
1.5
C.V.
0.757
4
Feb-99 <
n
24
5
Mar-99 <
3
1.5
6
Mar-99 <
Mult Factor =
2.55
7
Apr-99 <
3
1.5
Max. Value
7.6
8
Apr-99 <
Max. Pred Cw
19.4
9
May-99
10
May-99 <
3
1.5
11
Jun-99 <
12
Jun-99 <
3
1.6
13
J699 <
14
Jul-99 <
3
1.5
15
Aug-99
16
Aug-99 <
3
1.5
17
Sep-99
18
Sep-99 <
3
1.5
19
Oct-99 <
20
Oct-99 <
3
1.5
21
Nov-99
22
Nov-99 <
3
1.5
23
Deo-99
24
Dec99 <
3
1.5
25
Jan-00 <
26
Jan-00 <
3
1.5
27
Feb-00
28
Feb-00 <
4
2.0
29
Mar-00
30
Mar-00
31
Apr-00 <
3
1.5
32
Apr-00
33
May-00 <
34
May-00 <
3
1.5
35
Jun-00 <
36
Jun-00 <
3
1.5
37
Jul-00 <
3
1.5
38
Jul-00 <
3
1.5
39
Aug-00 <
3
1.5
40
Aug-00 <
3
1.5
41
Sep-00
42
Sep-00
43
Oct-00 <
0
0.0
44
Oct-00
45
Nov-00
46
Nov-00 7.6
7.6
47
Dec00
48
Dec-00
49
Jan-01
50
Jan-01
51
Feb-01
52
Feb-01 <
3
1.5
53
Mar-01
54
Mar-01
65
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
RPA --Mount Holly, Data Sheet
6/6/01

M REASONABLE POTENTIAL ANALYSIS
80 Jan-98
80
81 Feb-98
140
140 81
82 Mar-98
82
83 Apr-98
83
84 May-98 <
120
60 84
85 Jun-98
85
86 Jul-98
86
87 Aug-98
164.0
164 87
88 Sep-98
88
89 Oct-98
89
90 Nov-98
390
390 90
91 Dec-9B
91
RPA --Mount Holly. Data Sheet
10 - 6/6/01

C
REASONABLE POTENTIAL ANALYSIS
Parameter= jCyanlde Parameter= INIckell
n
Date Data
BDL=1/2DL
Results
n
Date Data
BDL=I12DL
Results
1
Jan-99 <
10
5.0
Std Dev.
17.461
1
Jan-99
Std Dev.
2
Jan-99
Mean
14.136
2
Jan-99 <
40
20.0
Mean
3
Feb-99
C.V.
1.235
3
Feb-99 <
C.V.
4
Feb-99 <
10
5.0
n
22
4
Feb-99 <
40
20.0
n
5
Mar99
5
Mar-99 <
6
Mar-09 <
10
5
Mult Factor =
4.01
6
Mar-99 <
40
20
Mult Factor =
7
Apr- 9 <
10
5
Max. Value
84.00 pg/I
`: 7
Apr-99 <
40
20
Max. Value
8
Apr-99
Max. Pred Cw
337 /egli
8
Apr -99 <
Max. Pred Cw
9
May-9
32
32
9
May-99 <
40
20
10
May-"
10
May-99 <
11
Jun
11
Jun-99 <
12
Jun-99 <
10
5
12
Jun-99 <
40
20
13
Jul-99
15
15
13
Jul-99
14
Jul-99
14
Jul-99 <
40
20
15
Aug-s9
18
18
15
Aug-99
16
Aug-9916
Aug-99 <
40
20
17
Sep-99
12
12
17
Sep-99
18
Sep-99
18
Sep-99 <
40
20
19
Oct-99
24
24
19
Oct-99
20
oct
20
Oct-99 <
40
20
21
Nov--
10
10
21
Nov-99
22
Nov-99
22
Nov <
40
20
23
Dec-99
84
84
23
Dec-99
24
Dec-99
24
Dec-99 <
40
20
25
Jan-Q,0
25
Jan-00
26
Jan-00
20
20
26
Jan-00 57
57
27
Feb4
27
Feb-0O
28
Feb-0)
17
17
28
Feb-00 57
57
29
Mar
29
Mar-00
30
Mar-00
30
Mar-00
31
Apr-W
<
10
5
31
Apr-00
32
Apr- Q�
32
Apr-00 <
40
20
33
May-
<
10
5
33
May-00
34
May-
34
May-00 <
40
20
35
Jun -OD
35
Jun-00
36
Jun-
<
10
5
36
Jun-00 14
14
37
Jul-0t3
<
10
5
37
Jul-00
38
Juk*
<
10
5
38
J600 19
19
39
Aug-00
39
Aug-00
40
Aug-0
<
10
5
40
Aug-00 <
10
5
41
Sep-04
41
Sep-00
42
Sep-00
42
Sep-00
43
Oct-09
43
Oct-00
44
Oct-09
44
Oct-00 24
24
45
Nov-09
45
Nov-00
46
Nov-00
19
19
46
Nov-00 34
34
47
Dec-00
47
Dec-00
48
Deo-00
48
Dec-00 28
28
49
Jan-C
49
Jan-01
50
Jan-0
50
Jan-01 15
15
51
Feb-011
51
Feb-01
52
Feb-01 <
10
5
52
Feb-01 28
28
53
Mar-01
53
Mar-01
54
Mar-01
54
Mar-01 32
32
55
55
56
56
57
57
58
58
59
59
60
60
61
61
62
62
63
63
64
64
65
65
66
66
67
67
68
68
69
69
70
70
11.48
23.7
0.484
25
1.87
57.0
106.6
-7-
RPA --Mount Holly, Data Sheet
5124/01

9
REASONABLE POTENTIAL ANALYSIS
Parameter=
:.- Parameter = Iseleniurn
ug/L
n
Date Data
BDL--1/2DL Results
n
Date Data
BDL--1/2DL
Results
I
Std Dev.
#DIV/01
1
Std Dev.
0.00
2
Mean
#DIV/01
2
Mean
2.5
3
C.V.
#DIV/01
3
C.V.
0.000
4
n
0
4
n
9
5
5
6
Mult Factor =
#DIV/01
6
Mult Factor =
1.00
7
Max. Value
0.0 pw
7
Max. Value
2.5
8
Max. Pred Cw
#DIV10!
8
Max. Pred Cw
2.5
9
9
<
10
10
<
12
12
<
13
13
<
14
14
<
15
<
16
16
<
17
17
<
18
18
<
19
Jan-99
19
Jan-99 <
20
Jan-99
20
Jan-99 <
21
Jan-99
21
Jan-99 <
22
Feb-W
22
Feb-99 <
5
2.5
23
Feb-99 <
23
Feb-99
24
Mar-99
24
Mar-99
25
Mar-99
25
Mar-99 <
26
Apr­99
26
Apr-99
27
Apr­99
27
Apr­99
28
May-99 <
28
May-99 <
5
2.5
29
May-99
29
May-99
30
Jun-99
30
Jun-99
31
Jun-09
31
Jun-99 <
32
Jul-99 <
32
Jul-99
33
Jul-99
3 3
Jul-99
34
Aug-99
34
AW99
35
Aug-99 <
35
Aug-99 <
5
2.5
36
Sep-99
36
Sep-99
37
Sep-99
37
Sep-99
38
Oct-99
38
OCI-99
39
Oct-919
39
Oct-99
40
Nov-99
40
Nov-99
41
Nov-99 <
41
Nov-99 <
5
2.5
42
Dec-99
42
Dec-99
43
Dec-99
4 3
Dec-99
44
Jan-00
44
Jan-00
45
Jan-Ob
45
Jan-00
46
Feb-00
46
Feb-00
47
Feb-00 <
47
Feb-00 <
5
2.6
48
Mar-00
48
Mar-00
49
Mar-00
49
Mar-00
so
Apr-00
so
Apr­00
51
Apr­00
51
Apr­00
52
May-06 <
52
May-00 <
5
2.5
53
May-00
53
May-00
54
Jun-W
54
Jun-00
55
Jun-00
55
Jun-00
56
Jul-09
56
Jul-00
57
Jul-00
57
Jul-00
58
Aug-09 <
58
Aug-00 <
5
2.5
59
Aug-09
59
Aug-00
60
SOP-09
60
Sep-00
61
Sep-09
61
Sep-00
62
Oct-00
62
Oct-00
63
Oct-00
63
Oct-00
64
Nov-00
64
Nov-00
65
Nov-00 <
65
Nov-00 <
6
2.5
66
Dec-00
66
Dec-00
67
Dec-00
67
Dec­W
68
Jan-01
68
Jan-01
69
Jan-Oi
69
Jan-01
70
Feb-01 <
70
Feb-01 <
5
2.5
RPA --Mount Holly, Data Sheet
.9- W4/01

0
REASONABLE POTENTIAL ANALYSIS
Fla
rameter= IMercury ...Parameter= Chlorinated Phenol
n Date Data BDL--1/2DL Results n Date Data BDL_-1J2DL Results
Jan-99 Std Dev. 0.02
Std Dev.
2 Jan-99 Mean 0.1 2 Mean
3 Feb-99 < 0.1 0.1 C.V. 0.361
3 C.V.
4 Fjeb-99 n 9 4 n
5 ar-99
5
6
Yar-99 Mutt Factor = 2.07 6 Mutt Factor
7 A Max. Value 0.1 pw
Apr-99 < 7 Max. Value
8 '1'pr-qq < Max. Pred Cw 0.2
% 8 Max. Pred Cw
9 ay-99 < 0.2 0.1 9
10 ay-99 10
11 un-99
11
12 Jun-99
12
13 Jul­99 13
14 oum 14
is Aug-99 < 0.2 0.1 is
16 Aug-99
16
17 SW99 17
18 Sep-99 18
19 §�-qq 19
20 C -99 20
21 "-99 21
22 l9pv­99 < 0.1 0.05 22
23 6�Sc-99 23
24 24
25 J n-00 25 <
26 Zn-00 26 < 5A4"
27 Fpb-00 27 <
28 Feb-00 < 0.1 0.05 28 <
29 ar-00 29
30
Z-00 30
31 Apr-00 31
32 4r_00 32
33 moy-00 < 0.1 0.05 33
34 My00 34
35 JUn-00 35
36 Jun-00 36
37 Jum 37
38 jum 38
39 A'9-00 < 0.1 0.05 39
40 A0 g-00 40
41 41
42 SOP-00 42
43 Qct-00 43
44 Od-00 44
45 W�V-00 45
46 NOV-00 < 0.1 0.05 46
47 Dec-00 47
48 Dec-00 48
49 JAn-01 49
50 Jan-01 so
61 Feb-01 < 0.1 0.05 51
52 52
53 53
54 64
55 55
56 56
57 57
5 58 8
59 59
60 60
61 61
62 62
63 63
64 64
65 65
66 66
67 67
68 68
69 69
70 70
RPA —Mount Holly, Data Sheet
-11. 5/24/01

REASONABLE POTENTIAL ANALYSIS
::Parameter= lPhenol
#DIV/01
Parameter- iZinc
n
Date
Data
BDL=1/2DL
Results
n
Date
Data
#DIV101
1
Jan-99
11
11
Std Dev.
37.90
1
Jan-99
#DIV/01
2
Jan-99
<
6
3
Mean
21.2
2
Jan-99
#DIV101
3
Feb-99
<
6
3
C.V.
1.785
3
Feb-99
251
0
4
Feb-99
<
6
3
n
52
4
Feb-99
194
5
Mar-99
8
8
6
Mar-99
227
#DIV/01
6
Mar-99
<
6
3
Mutt Factor =
3.13
6
Mar-99
243
0.0 IV
7
Apr­99
<
6
3
Max. Value
190 MO
7
Apr-99
260
#DIV/01
8
Apr-99
<
6
3
Max. Pred Cw
595 lign
8
Apr-99
290
9
May-99
13
13
9
May-99
270
10
May-99
<
6
3
10
May-99
230
11
Jun-99
<
6
3
11
Jun-99
ISO
12
Jun-99
<
6
3
12
Jun-99
270
13
Jul-99
<
6
3
13
Jul-99
130
14
Jul-99
<
6
3
14
Jul-99
220
is
Aug-99
10
10
is
Aug-99
180
16
Aug-99
6
6
16
Aug-99
130
17
SOP-99
<
6
3
17
Sep-99
< so
18
Sep-99
52
52
18
Sep-99
130
19
Oct-99
<
6
3
19
Oct-99
190
20
Oct-99
<
6
3
20
Oct-99
180
21
Nov-99
<
6
3
21
Nov-99
200
22
Nov-99
<
20
10
22
Nov-99
200
23
Dec-99
84
84
23
Dec-99
280
24
Dec-99
<
6
3
24
Dec-99
390
25
Jan-00
<
6
3
25
Jan-00
460
26
Jan-00
<
6
3
26
Jan-00
450
27
Feb-00
<
6
3
27
Feb-00
230
28
Feb-00
<
6
3
28
Feb-00
260
29
Mar-00
29
Mar-00
30
Mar-00
30
Mar-00
31
Apr-00
<
6
3
31
Apr-00
240
32
Apr-00
<
6
3
32
Apr­00
340
33
May-00
<
6
3
33
May-00
270
34
May-00
190
190
34
May-00
180
35
Jun-00
51
51
35
Jun-00
160
36
Jun-00
10
10
36
Jun-00
190
37
Jul-00
<
10
5
37
Jul-00
130
38
Jul-00
28
28
38
Jul-00
ISO
39
Aug-00
46
46
39
Aug-00
120
40
Aug-00
<
10
5
40
Aug-00
170
41
Sep-00
<
10
s
41
Sep-00
120
42
Sep-00
91
91
42
Sep-00
110
43
Oct-00
10
10
43
Oct-00
160
44
Oct-W
<
10
5
44
Oct-00
280
45
Nov-00
<
so
25
45
Nov-00
340
46
Nov-00
<
so
25
46
Nov-00
230
47
Dec-00
<
10
5
47
Dec-00
340
48
Dec-00
<
10
5
48
Dec-00
310
49
Jan-01
110
110
49
so
Jan-01
<
10
5
so
61
Feb-01
120
120
51
52
Feb-01
<
10
5
52
53
Mar-01
90
90
53
64
Mar-01
<
10
5
54
55
55
56
56
57
57
58
58
59
59
60
6
0
61
61
62
62
63
63
64
64
65
65
66
66
67
67
68
68
69
69
70
70
BDL=1/2DL
251
194
227
243
250
290
270
230
150
270
130
220
180
130
25
130
190
180
200
200
280
390
460
450
230
260
240
340
270
180
160
190
130
150
120
170
120
110
160
280
340
230
340
310
RPA -Mount Holly, Data Sheet
.12- 5/24/01

0
mml
3
MWF A E •
n6-4 y 6�
�fo�l5 h-o (c6 c� 'favl�

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rzAI 7` 76
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NPDES/Non-Discharge Permitting Unit Pretreatment Information Request Form
VPDES OR NONDISCHARGE PERMITTING UNIT COMPLETES THIS PART:
Date of Request 1/26/01
Facility
Mount Holly Wastewater Treatment Plant
Permit #
NCO021156
Region
Mooresville Regional Office
Re uestor
Joe Corporon
Pretreatment Keyes McGee (ext 580)
Contact
PRETREATMENT UNIT COMPLETES THIS PART:
Status of Pretreatment Program (circle all that apply)
1) the facility has no SIU's and does have a Division approved Pretreatment Program that isINACTIVE
2) the facility has no SIU's and does not have a Division approved Pretreatment Program
3) the facili h retreatment Program
1 a is Full Program with LTMP or dified Program with STMP
�AA 4) t e as I y en rogram - Full Modified
5) additional conditions regarding Pretreatment attached or listed below
Flow Permitted
• Industrial 71
• Domestic 29
Actual
77
23
STMP time
frame:
most recent
16
I. (5)T MP
Pollutant
Check List
Pnf' clue -to NPDES/No
barge -Permit -Limit
Required
by EPA*
Required
by 503
Sludge"
POC due to
SIU•"
Site specific POC
(Provide
Explanation)""
412
Frequency
at effluent
BOD
TSS
NH3
Arsenic
Cadmium
Chromium v
Copper
Cyanide
Lead
Mercury
Nickel
Silver
Selenium
Zinc
MBAS
Phenol
% Solids
Slud a to Dis
osal
C L _vN
vays in the LTMP
my in the LTMP it the POTW land applies sludge
Drily in LTMP while Me SIU is connected to Me POTW
Only in LTMP when the pollutant is a specific concern to the POTW (ex -Chlorides for a POTW who accepts TeMle wsale)
Quarterly
Comments: Jeff Fritts Pretreatment Coordinator for the Town of Mount Holly provided the
summary of Long Term Monitoring Plan Data for the Town of Mount Holly.
version a/23/00
Mt —Holly Pretreahnent
Revised: August 4, 2000

t t
Instream Waste Concentration (IWC)
City of Mount Holly WWTP
N C0021156
Prepared By: Joe Corporon, NPDES Unit
Enter Design Flow (MGD): 4
Enter s7Q10(cfs): 95
Enter w7Q10 cfs :
Residual Chlorine
Ammonia (NH3 as N)
(summer)
7Q10 (CFS)
95
7Q10 (CFS)
95
DESIGN FLOW (MGD)
4
DESIGN FLOW (MGD)
4
DESIGN FLOW (CFS)
6.2
DESIGN FLOW (CFS)
6.2
STREAM STD (UG/L)
17.0
STREAM STD (MG/L)
1.0
UPS BACKGROUND LEVEL (UG/L)
0
UPS BACKGROUND LEVEL (MG/L)
0.22
IWC (%)
6.13
IWC (%)
6.13
Allowable Conc. (ug/1)
277
Allowable Conc. (mg/1)
13.0
Ammonia (NH3 as N)
(winter)
7Q10 (CFS)
0
Fecal Limit
200/100ml DESIGN FLOW (MGD)
4
(if DF >331; Monitor)
DESIGN FLOW (CFS)
6.2
(If DF <331; Limit)
STREAM STD (MG/L)
1.8
Dilution Factor (DF)
16.32 UPS BACKGROUND LEVEL (MG/L)
0.22
IWC (%)
100.00
Allowable Conc. (mg/1)
1.8
INPDES Servor/Current Versions/IWC
5/22/01

Whole Effluent Toxicity Testing Self -Monitoring Summary March 20, 2001
FACILITY REQUIREMENT
YEAR JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
NOV
DEC
MonsentnlOn1.002 Perm 24u P/fac lira: M% Rhd(combined omroll)
Y 1097 -
Pass
-
-
Pop
-
-
Pus
-
-
Pam
-
NC0003719/002 Begin:1/I/1996 Fregmm': Q P/F + Feb May Aug Nov NonComvSin81c
108 -
Pass
-
-
Pau,
-
-
Pau
-
-
Pu
-
Co.." Cumbndand Region: FRO Subtual CPFIS
IWO -
Pen
-
-
lab
Paw
-
Felt
Pop.Fap
-
Pm
-
Ple 1.3 Saw al
20M -
Pea
-
-
Pap
_
_
Pap
_
_
Pan
_
7010: TOLD IWC(%).VZ QdP:
2001 -
Mean County p Palm chr Jim: 41%
Y 1907 -
-
Pau
-
-
Penn
-
-
Pass
-
-
Lab
NCO03750810DI Begb:WV2000 Frcquency:Q Mar Jun Sp Dec + Non(Cont:Single
1098 Pap
-
Pam
-
-
Pau
-
-
Pp.
-
-
Pas.
County. Moore Region: PRO Subbmin: LUM50
190 -
-
Pep
-
-
Pau
-
-
lab
Pau
-
Pau
PF: 6.7 SeaW
2000 _
_
Full
_
_
Pont
-
-
Pass
-
_
Pan
7QIO: 152 Iwq%)AO.54 Lana:
Mt -
MoarpNlleWWPP P. clan lime W% Mew Pemt 31larl
Y 1997 -
Pep
-
-
Pu
-
-
Pm
-
-
Pass
-
NCMt6728NU1 Bcgin:ll/1/1994 Frwtwsy^QP/F + Feb May Aug Nov NonComP:SINGLE
IWO -
Pea
-
-
Pon
-
-
Pon
-
-
Pu
_
Cattle": Imdell Region: MRO Subbuin: YADII
IWO -
Pass
-
-
Pen
-
-
Fall
Fail
Pau
Paw
-
PF. 5.2 Srcid
20M -
Pass
-
-
Pass
-
-
Fell
>109
>100
Pass
-
7QI0:0.5 IWC(%)94.15 Drees:
2001 -
Morehead City W P PERM 24HR AC P/F LIM: W% MYSID(New penn 4/12MU
I99T -
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-
>100
Pass
-
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Pm
-
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-
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7QIO:TIDAL IWC(%):NA order:
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-
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tone Pass
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1907 -
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2001 -
LEGEND:
PERM - Peace Regmrtmem LET- Administrative Lever - Target Frequency- Monlmong fics,epcy Q-Qunmly; M- Monthly;W. Bimonthly; SA- Semiannually; A. Annually; OWD. Only when dischnging D. Discontinued monnonng mquitmum
Bgin-Fustmanlhrcgmml 7QI11=Rcccimngalmum lnw Bow critcnnn lcfcl +=quuncrly shmetemigittcmwcs to monthly upon failure or NR Monlhx mettestingmut occur -ex. hat, Apr. Jul. Oct NonComp- Curren Co"Imme Requirement
PF-Permltlednow(MGD) IWCP6-lnapentweleconecomamn PIF=PasOPai out AC - Acura CHR- Chronic
Dam Noothon: f- Fabcad Minnow: e - CemoduPMia V.: my - Mysld shun, ChV - Chmnie slue; P - Moral afteated Percenpe at highest concentration: at - PerfUmad by DWQ Aquatic Tox Unit; be - Bad am,
Reporting Nmation: - -= Dam not requimd; NR - Not rarwned F.cll'ny Activity Senna- Iuerivo, N - Newly lssued(Tr cammucO;H- Active be. not decharging+-More dam available for nenN in qu tion: -- ORCsi®mmp needed
32

SOC PRIORITY PROJECT: Yes —No X
If Yes, SOC No.
To: Permits and Engineering Unit
Water Quality Section
Attention: Valery Stephens
Date: March 19, 2001
County: Gaston
Permit No. NCO021156
PART I - GENERAL INFORMATION
1. Facility and Address: Mt Holly WWTP
City of Mount Holly
P.O. Box 406
Mount Holly, N.C. 28120
2. Date of Investigation: February 20, 1996
i
MAR 3 0 2001
WATER QIJAL Ty
L-F
PONNT SOURCE BRANCH
3. Report Prepared By: Samar Bou-Ghazale, Env. Engineer I
4. Persons Contacted and Telephone Number: Jeff Fritz, (704) 822-
2939.
5. Directions to Site: From the junction of Highway 273 and
Tuckaseegee Road in Mount Holly, travel southeast on
Tuckaseegee Road approximately 0.55 mile to the junction with
Broome Street. Turn left (east) and proceed on Broome Street
approximately 0.2 mile to the entrance of the treatment plant.
6. Discharge Point(s). List for all discharge points:
Latitude: 35'15'55" Longitude: 81°00'35"
Attach a U.S.G.S. map extract and indicate treatment facility
site and discharge point on map.
U.S.G.S. Quad No.: F 14 SE U.S.G.S. Name: Mount Holly, N.C.
7. Site size and expansion are consistent with application?
Yes X No If No, explain:
8. Topography (relationship to flood plain included): Slopes

range from 2 to 6%. The site is not located in a flood plain.
9. Location of nearest dwelling: No dwellings within 500 feet of
the wastewater treatment plant.
10. Receiving stream or affected surface waters: Catawba River
a. Classification: WS-IV CA
b. River Basin and Subbasin No.: Catawba; 03-08-33
C. Describe receiving stream features and pertinent
downstream uses: The receiving stream is the Catawba
River which contains a good flow at all times. The City
of Belmont water supply intake is located approximately
3 miles downstream just below where Highway 74 crosses
the Catawba River. The river is also used for primary
and secondary recreational activities.
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. a. Volume of wastewater to be permitted: 4.0 MGD (Ultimate
Design Capacity)
b. What is the current permitted capacity of the wastewater
treatment facility? 4.0 MGD
C. Actual treatment capacity of the current facility
(current design capacity)? 4.0 MGD
d. Date(s) and construction activities allowed by previous
Authorizations to Construct issued in the previous two
years: N/A
e. Please provide a description of existing or substantially
constructed wastewater treatment facilities: The
existing activated sludge wastewater treatment facilities
consists of manually cleaned influent bar screen, dual
grit chambers, instrumental flow measurement, a flow
equalization basin, Three (3) aeration basins with
mechanical aeration, dual secondary clarifiers, dual
chlorine contact chambers, dual sludge holding tanks(not
in use, formally clarifiers that have been replaced),
four sludge holding thanks, and dual sand drying beds
(not in use).
f. Please provide a description of proposed wastewater
treatment facilities: N/A
g. Possible toxic impacts to surface waters: Toxic impacts
could be caused by Cd, Cr, Cu, Ni, Pb, Zn, CN, Ag, and Hg
which are known to be present in the wastewater.

h. Pretreatment Program (POTWs only): Approved
2. Residuals handling and utilization/disposal scheme:
a) If land applied, please specify DWQ Permit No.
WQ0001863.
Residuals Contractor: Bio-Nomic Services, Inc.
Telephone No. 704-529-0000
b) Residuals Stabilization: The facility meets the
requirements of the part 503 sludge regulations for
Class B sludge.
3. Treatment plant classification: Class III
4. SIC Code(s): 4952
Primary: 01 Secondary:
Main Treatment Unit Code: 02003
PART III - OTHER PERTINENT INFORMATION
1. Is this facility being constructed with Construction Grant
Funds or are any public monies involved (municipals only)?
N/A
2. Special monitoring or limitations (including toxicity)
requests: N/A
3. Important SOC, JOC or Compliance Schedule dates: (please
indicate) N/A
4. Alternative Analysis Evaluation: Has the facility evaluated
all of the non -discharge options available. Please provide
regional perspective for each option evaluated. N/A
5. Air Quality and/or Groundwater concerns or hazardous
materials utilized at this facility that may impact water
quality, air quality, or groundwater: No AQ or GW concerns
nor are hazardous materials utilized at this facility.
PART IV - EVALUATION AND RECOMMENDATIONS
The City of Mount Holly is applying for renewal of the
permit.
The wastewater treatment facilities were in good operational
condition at the time of inspection.

The City of Mount Holy requests the removal of the
requirement to monitor chlorinated phenols since none have been
detected since August 1996. Also, the City is requesting
removal or reduction in the requirement to monitor phenol.
According to the City, the maximum concentration detected in the
effluent since August 1996 was 0.19 mg/l.
Pending review and approval by P&E, it is recommended that
the NPDES Permit for this facility be renewed.
Supervisor

Voil<.-rJ
City of Mount Holly
131 South Main Street
Post Office Box 406
Mount Holly, North Carolina 28120
Phone: [phone] Fax: [phone]
Frank McLean, Mayor
Jim Hope, Councilman
Phyllis Halls, Councilwoman
Michael Helms, Councilman
January 30, 2001
Mr. Charles H. Weaver, Jr.
NC DENR / Water Quality / NPDES Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
Subject: Permit Renewal
NCO021156
Mount Holly WWTP
Gaston County, NC
Dear Mr. Weaver:
Robert D. Black, Mayor Pro Tem
Bryan Hough, Councilman
Pat Hubbard, Councilwoman
David Kraus, City Manager
fE8 ' 5 2001
DENR - WATER QUALITY
POINT SOURCE BRANCH
The City of Mount Holly would like to request the renewal of its NPDES Permit
No. NC0021156. Please find attached copies of the permit application and supporting
documentation.
The City requests the removal of the requirement to monitor chlorinated phenols
as there has been none detected in the effluent since 9/96. The City would also request
the removal or significant reduction (annual, quarterly) of the requirement to monitor
phenol. The maximum detected in the effluent since 9/96 was 0.19 mg/1 with annual
averages ranging from < 0.013 mg/l to < 0.045 mg/l.
Thank you for your consideration. If you have any questions, please feel free to
contact Mr. Jeff Fritts or me at [phone].
Sincerely,
Eddie Nichols
Public Works Director

JEFF,
1/29/01
THE FOLLOWING IS A LIST OF CHLORINATED PHENOLS
WITH THE MAXIMUM AND MINIMUM AND AVERAGES
FROM THE THE TIME WE STARTED RUNNING ON 9/96
UNTIL PRESENT.
9/96 THROUGH 12/96
Maximim = <10 ugl Minimum = <10 ugl Average = <10 ugl
1/97 THROUGH 12/97
Maximum = <10 ugl Minimum = <10 ugl Average = < 10 ugl
1/98 THROUGH 12/98
Maximum = <10 ugl Minimum = <10 ugl Average = < 10 ugl
1/99 THROUGH 12/99
Maximum = <17 ugl Minimum = < 8 ugl Average = < 9 ugl
1/2000 THROUGH 12/2000
Maximum = < 8 ugl Minimum = < 6 ugl Average = < 6 ugl

0JLU
1/29/01
THE FOLLOWING IS A LIST OF PHENOLS WITH THE
MAXIMUM AND MINIMUM AND AVERAGES
FROM THE THE TIME WE STARTED RUNNING ON 9/96
UNTIL PRESENT.
9/96 THROUGH 12/96
Maximim = .09 mgl Minimum = < .06 mgl Average = < .045 mgl
1/97 THROUGH 12/97
Maximum = .05 mgl Minimum = .02 mgl Average = .024 mgl
1/98 THROUGH 12/98
Maximum = .03 mgl Minimum = <.006 mgl Average = .018 mgl
1/99 THROUGH 12/99
Maximum = .084 mgl Minimum = <.006 mgl Average = .013 mgl
1/2000 THROUGH 12/2000
Maximum = .19 mgl Minimum = <.006 mgl Average = .027 mgl

SECTION I. APPLICATION AND FACILITY DESCRIPTION
A
Present QRgrating Status — Preliminary treatment includes bar -screen and grit removal.
Flow equalization consists of one (1) 2.0 million gallon basin with flow entering by
gravity and!, exiting to aeration by three with 700 gpm capacity each pumps. Secondary
treatment consists of three aeration basins -- two (2) 2.0 million gallon with four (4) 40
SIP mechanical aerators each and one (1) 4.0 million gallon basin with five (5) 40 HP
mechanical aerators each. Clarification consists of two (2) 75 ft. diameter clarifiers rated
at 2 MGD each. Activated sludge may be returned to the head of the plant or wasted to
two (2) 0.75 million gallon each sludge holding tanks via three (3) sludge pumps with
capacities of 1250 gpm each. Disinfection in accomplished by the addition of chlorine in
two (2) chlorine contact basins with a design capacity of 2 MGD each — one has a radius
of 19 ft. and one has a radius of 17.5 ft.
Potential FaciftC ___hanges — Expansion of the plant from 4.0 MGD will likely occur
within the text 10 years. However, more specifics of that upgrade have not been
determinedat this time.
Schematic of wastewater Flow — Please see attached.
Location Man — Please see attached.

Page 1 of 1
e
Grit Chamber (Industrial
arDOlanber(Donestb
(Donettb
Dryeg Aeration Basin No.3
! Flow=2 MOD ! { Flom=
;'Curkier No. r_
#d Hot!t1wNo. t
� Aeration �BasiB No. 2
'low = 2 M G D
C �rifier No .4 If .` r^�.- - _ Flow=1 M1
<f Return Slu Se Pumping Station
Clarifier o.2
i �.�-_Y•.Y.CRbrine Tank No. 1
i 6 WBB NEtlYO �fY a 3 f�J]CR
Aeration Basin Na. 1
'i r-': ,•. ;.....( �".-.`��_&._ Flow =2.MDD -...�
Chlorine Tank No.
ChTDrine Bulldi f
Sludge Digestor No. 2
Sludge Digestor N-'i-.:` `'"^•..
EffluentOutfall#001'
Polymer B ' ding 1
Mount Holly, NC
Sewage Treatment
Facility
Legend
® Features Not In Use
.� Effluent Discharge # 001
[�n �Parcels
l v Streams
Influent Flow Direction
Aeration Flow Direction
Ettluerd Flow Diredion
Sludge FlowDiredion
Paved Surface
0 Sewer Plant Structures
Catawba River
N
A
Scale
50 0 50 100 Feet
' m1ry" Clb m".'
xayoe; ro sat Bw�ae t pmsrs K ab
sxore reamcMbJlib.
Co., ma• ee m tlred m
Clb ".1 xaly
"W Loa RPlarxra On
rD Boy me
roll xdb. BC mim
Ca V Vb p bn
RDNaza�
ILMCa09N®tl nanVMlync.ur
01/26/2001
file://AAsite 3ajpg

0
F I I
Mount Holly, NC
Seaver Treatment
Facility
Vidniiy Map
Legend
I • ;I
1 I Major Povverlines
Roads
:ae Interstate
$ �O Municipal
FaR 3P1iJLLSpR R "` S I,U ri HWY
l � , /Private
NState Road
Trail
tS HWY
• Effluent Discharge # 001
- Mount Holly Sevver Plant
Stream s
Topography Contours
Catawba River
Scale
300 0 300 600 Feet

NC DENR J DWQ I NPDNS PERMIT APPLICATION - STANDARD FORM A
Municipal Fauetlities with permitted flows > 1 MGD or with pretreatment programs
SECTION 111. INDUSTRIAL WASTE CONTRIBUTION TO MUNICIPAL SYSTEM
SubRtft a separate Section 111 for each 5ignlhicant Industrial User.
1. Significant Industrial User (SIU)
An SIU has (or could have) significant impact on the POTw receiving the wastewater or upon the quardy of effluent from the receiving P07W.
Specify, an SIU:
• has a flow of 50,000 gallons or more per average workday;
• has a Row greater than 5 percent of the total flow carried by the municipal system m receiving the waste, or
• has a toxic material in Its dsdmW.
It may be necessary to alter these administrative crifem in certain cues, such as an instance where two ormore conftuting industries in
cm7 b nation can produce an wxM*able effect on effiter the municipal or the 9AUV of iss effluent.
Name of SIU Cam' Dyeina Co, ,
Street address 17 Charlotte Ave „
City Mount Molly County Gaston
State�VC lip Code 28120
Telephone Number
Fax Number
e-mail address
( 704 )827-1 009
2. Primary Product or Raw Material
Specify either the pOncipal product or the principal raw material and the maximum quantity per day produced or consumed
Quantities are to be reported in the units of measurement for each SIC category at the facility. SIC categories, shodd use the units of
measurement nwnaffy used by that ImMsh ►.
Product Raw Material Quantity Units
12,330 I bslday
ed knitted doth
3. Flow
Indcate the volume of water discharged into the POTW and wtmther• this dscharge is intennittent or co n inuous
21 MGU 0 Intermittent 0 Conunuous
4of7

NC DENR / D'W'Q / NPDES PERMIT APPLICATION - STANDARD FORM A
Municipal Faeflities with permitted flows > 1 MGD or with pretreatment programs
SECTION 111, INDUSTRIAL WASTE CONTRIBUTION T4 MUNICIPAL SYSTEM
Submit a separate Section /it for each Significant /ndustrM User.
1. Slgnificant Industrial User (SIU)
An SIU has (or could have) significant i npact on the POTW receiving the wastewater or upon the guar* of effluent from the receiving POTW.
Specffxcr, an SIU:
• has a flow of 50,000 gallons or more per average workday,
• has a flow greater than 5 percent of the total ftow carried by the munidpal system m receiving the waste, or
• has a toxic Material in its dSChaW.
It may be necessary to alter these administrative criteria in cert'aln comes, such as an instance where two or more conbt'buting industries in
combination can produce an undesirable effect on either the municipal facility or the quality of its effluent
Name of SIU Ft ahtliner
Street address
City Mount Holiti_�__r__y County Gaston
State NC Zip Code 28120
Telephone Number ( 704 )$22-7412
Fax Number
e-mail address
2. Primary Product or Raw Malaria!
Specify either the principal product or the principal raw material and the maximten quardiiy per day prodixed or consumed
Quantifies are to be reported In the units of measurement for each SIC category at the facility. SIC categories shodd use the units of
measurement nonce ly used by that industry.
Product Raw Material Quantity Units
Trucks 150 Trucks/day
3. Flow
Indicate the volume of water discharged into the POTW and whether this discharge Is irterrniiterd or continuous
0.06 MGD Intermittent a Cordinuous
5of7

NC DNNR / DWQ / NPDRS PRR IT APPLICATION - STANDARD FORM A
Municipal Facilities with permitted flows > 1 MGD or with pretreatment programs
SECTION Ill. INDUSTRIAL !WASTE CONTRIBUTION TO MUNICIPAL SYSTEM
Submit a separate Seaton 111 for each Slgnigcant lnafustrlal User.
1. Significant Industrial User (SIU)
An SIU has (or could have) sip fart impact on the POTW nfcel ft the wastewater or upon the quality of etituent from the reoeivhV POTW.
Spvcifi aly, an SIU:
• has a flow of 50,000 gaM = or more per average workday;
• has a flow gre W than 5 percent of the total flow carried by the mun4al system m receiving the waste, or
• has a toxic maWfal in its discharge.
It may be necessary to after these adminisMve aiberia in certain cases, such as an instance where two or more contr dng irtdwWW in
combination can p idle an un&*vNe effect on either the municipal Witty or the quality of b effluent
Name of S!U Old
Street address 625E Catawba /dye
City Mount Molly _ County Gggon_,,,,,,
State NC Zip Code 28120 ,.._
Telephone Number ( 704 )822-2114 —
Fax Number ( )
e-mail address
2. Primary Product or Raw Mat al
Specify either tits principal product or the principal raw material and the maximum quantity per stay produced or oonsumed
Quantities are to be reported in the units of measurement for each SIC category at the facility. SIC oategodes should use the units of
measurement normally used by that industry.
Product Raw Material Quern ' Units
475,OW lbslday
Organic Chemicals
8. Flow
lncicate the volume of water aiscto* into the P01 W and whether this dscharge is inWffn tent or corttirwous
.112 MGD ❑ InWnnittent ❑ Contnuous
6of7

.IF
r
NC DRNR / DWQ / NPDES PERMIT APPLICATION - STANDARD FORM A
Municipal Facilities with permitted flowa > 1 MGD or with pretreatment programs
SECTION III, INDUSTRIAL WASTE CONTRIBUTION TO MUNICIPAL SYSTEM
Submit a separate Secdon list for each Significant industnfat Wer.
1. Significant Industrial User (SIU)
An SIU has (or could have) s'rg 4cant hVact on the POTW receiving the wastewater or upon the quality of effluent from the receiving POTW.
Specific aW, an SIU:
• has a flaw of 50,000 gallons or more per aveage workday;
• has a flag greater than 5 percent of the total flow carried by the rnuniclpal system m receiving the waste, or
• has a toxic traterial in its dsdwp.
It may be nay to alter these admirdstrative ci teria in certain cases, such as an hstance *too bw or more contrbufing industries in
cxvrthination can produce an uWe*aW9 effect on dfha the municipal %cr'lit' y or the of its effluent.
Name of SIU AW&n & Efird MHIs
Street address
City. MQUat Moth►
State NC Zip Code 2§120 _
Telephone Number ( 704 )822-6014
Fax Number ( )
e-mail address
2. Primary Product or Raw Material
Specify either the principal product or the principal raw material and the ma dmcmt quantity per day prodwed or consumed
Quantities are to be reported In the units of measurement for each SIC category at the facility. SIC categories shodd use the units of
measurement normally used by that industry.
Product Raw Material Quan ' Units
Sewing Thread 100,000 UM/*
3. Flow
Indicate the volume of water discharged into the POTW and whether this disc hatge is IntermMent or continuous
1.29 MG0 0 Ird�mt [] Continuous
7of7

Narrative of Sludge Management Plan
For City of Mount Holly, NC
Sludge is wasted to holding tanks and thickened by gravity with supernatant returned to
the head of the plant. Sludge is stabilized with lime for pathogen and vector attraction
reduction. A contractor within the provisions of Land Application Permit No.
WQ0001863 then applies sludge to land at agronomic rates.