NC0088200_Permit Modification_20071121

NPDES DOCIMENT :;CANNING COVER SHEET
NPDES Permit:
NC0088200
Thomasville
WTP
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
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Complete File - Historical
Correspondence
Speculative Limits
Instream Assessment (67b)
Environmental
Assessment (EA)
Permit
History
Document Date:
November 21, 2007
This document is printed on reuse paper - ignore any
content on the reizerse side

ArirA
NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Michael F. Easley, Governor William G. Ross, Jr., Secretary
Coleen H. Sullins, Director
November 21, 2007
Mr. Morgan Huffman
Public Services Director .
P.O. Box 368
Thomasville, NC 27361-0368
Subject: Modification of NPDES Permit NC0088200
Thomasville WTP
Davidson County
Dear Mr. Huffman:
The changes you requested in consultation with Division staff in the NC DENR Winston-Salem Regional
Office have been approved. This permit modification clarifies the treatment components at the Thomasville
WTP and adds the groundwater monitoring requirements from permit WQ0000425. No other changes to
the permit have been made.
Please find enclosed the revised pages, which should be inserted into your permit. The old pages may
then be discarded. All other terms and conditions contained in the original permit remain unchanged and in
full effect. This permit modification is issued under the requirements of North Carolina General Statutes
143-215.1 and the Memorandum of Agreement between North Carolina and the U.S. Environmental
Protection Agency.
If any parts, measurement frequencies or sampling requirements contained in this permit modification
are unacceptable to you, you have the right to an adjudicatory hearing upon written request within thirty
(30) days following receipt of this letter. This request must be a written petition conforming to Chapter 150B
of the North Carolina General Statutes, filed with the Office of Administrative Hearings (6714 Mail Service
Center, Raleigh, North Carolina 27699-6714). Unless such demand is made, this decision shall be final and
binding.
If you have any questions concerning this permit modification, please contact Charles Weaver of the
NPDES Unit at [phone], extension 511.
Sincerely,
Coleen H. Sullins
cc: Central Files
Winston-Salem Regional Office / Steve Tedder
NPDES Unit
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
512 N. Salisbury St., Raleigh, North Carolina 27604
Phone: [phone] I FAX [phone] / www.ncwaterquality.org
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Permit NC0088200
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
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, the
City of Thomasville
is hereby authorized to discharge wastewater from a facility located at the
Thomasville Water Treatment Plant
Old Lexington Road
Thomasville
Davidson County
to receiving waters designated as an unnamed tributary to the Rich Fork Creek in
subbasin 03-07-07 of the Yadkin Pee Dee 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 December 1, 2007.
This permit and authorization to discharge shall expire at midnight on April 30, 2009.
Signed this day November 21, 2007.
41z,Coleen H. Sullins, Director
Division of Water Quality
By Authority of the Environmental Management Commission

Permit NC0088200
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby revoked.
As of this permit issuance, any previously issued permit bearing this number is no longer effective.
Therefore, the exclusive authority to operate and discharge from this facility arises under the permit
conditions, requirements, terms, and provisions included herein.
The City of Thomasville is hereby authorized to:
1. Continue to discharge clarified supernatant from the Alum Residual Lagoon System
(ARLS) located at the City of Thomasville Water Treatment Plant [Old Lexington
Road, Thomasville, in Davidson County]. The ARLS includes the following
components:
• 350-gpm pump station
• Force main [ca. 14,000 linear feet of 8" pipe]
• Residual receiving station
• 2.1-acre residual settling lagoon
• Decanting structure
• Rip -rap effluent discharge channel
• Three groundwater monitoring wells
2. Monitor and report results from three groundwater monitoring wells: MW-1, MW-2,
MW-3.
3. Discharge from said treatment works at the locations specified on the attached map
into an unnamed tributary to Rich Fork Creek, classified C waters in subbasin 03-
07-07 of the Yadkin Pee Dee River Basin.

Permit NC0088200
A. (1) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
During the period beginning upon the effective date of the permit and lasting until expiration, the
Permittee is authorized to discharge from outfall 001. Such discharges shall be limited and
monitored by the Permittee as specified below:
PARAMF'� • --
LIMITS
MONITORING REQUIREMENTS°
Monthly
, A era e 'Maximum
Daily
Measurement
Frequency,
Sample
> e ,
Sample
) Location
Flow'
0.2 MGD
2/Month
Instantaneous
Effluent
Total Suspended Solids
30.0 mg/L
45.0 mg/L
2/Month
Grab
Effluent
Total Iron
Monthly
Grab
Effluent
Total Aluminum
Monthly
Grab
Effluent
pH
> 6.0 and < 9.0 standard units
2/Month
Grab
Effluent
Total Residual Chlorine
17 pg/L
2/Month
Grab
Effluent
Settleable Solids
0.1 mUL
0.2 mUL
2/Month
Grab
Effluent
Notes:
1. For instantaneous flow monitoring the duration of the discharge must be reported in addition
to the total flow.
There shall be no discharge of floating solids or visible foam in other than trace
amounts.

Permit NC0088200
A. (2) GROUNDWATER MONITORING REQUIREMENTS
During the period beginning upon the effective date of the permit and lasting until expiration, the
Permittee is required to monitor the three existing monitoring wells: MW-1, MW-2, MW-3.
Sampling shall be conducted each November for the following parameters:
PAR METER ...
SAlYI ING / ANA11 I SAL REQLTIYREME S
Water Level1
Water levels shall be measured prior to sampling for the remaining parameters. The
depth to water in each well shall be measured from the surveyed point on top of each
casing. The point atop the casing shall be surveyed relative to a common datum.
Arsenic
Laboratory must be Division -certified for this parameter. _
Chromium
Laboratory must be Division -certified for this parameter.
Lead
Laboratory must be Division -certified for this parameter.
Nickel
Laboratory must be Division -certified for this parameter.
pH
Laboratory must be Division -certified for this parameter.
Total Dissolved Solids (TDS)
Laboratory must be Division -certified for this parameter.
Total Organic Carbon (TOC)
Laboratory must be Division -certified for this parameter. If concentrations greater
than 10 mg/L are detected in any down -gradient monitoring well, additional sampling
& analysis must be conducted to identify the individual constituents comprising the
TOC concentration.
If the concentration as measured in the background monitoring well exceeds 10
mg/L, this concentration will be considered representative of the naturally occurring
TOC concentration. Any exceedances of this naturally occurring concentration in the
down -gradient wells shall be subject to the additional sampling & analysis as
described above.
Volatile Organic Compounds (VOCs)
Laboratory must be Division -certified for this parameter. Laboratory must use only
one of the following methods:
1. Standard Method 6230D, Practical Quantitation Limit (PQL) at 0.5 pg/L or less;
2. Standard Method 6210, PQL at 0.5 pg/L or less;
3. EPA Method 8021, Low Concentration, PQL at 0.5 pg/L or less;
4. EPA Method 8260, Low Concentration, PQL at 0.5 pg/L or less;
5. OR another method with prior approval from the Aquifer Protection Section
Chief.
Any of the referenced methods must [at a minimum] include all the constituents listed
in Table VIII of Standard Method 6230D. Any method used must have a PQL at or
below 0.5 pg/L, supported by laboratory proficiency studies as required by the
Division's Laboratory Certification Unit. Any constituents detected above the Method
Detection Limit (MDL) but below the PQL must be qualified [estimated] and reported.
Reporting / Documentation Requirements
a. Sampling -& analytical results shall be submitted to the Division's Aquifer Protection
Section on or before the last working day following the sampling month. Data shall be
reported on the most recent version of the "Groundwater Quality Monitoring: Compliance
Report Form" [i.e. the GW-59 Form] with copies of the laboratory analyses attached.
b. All reports, maps, and other documents shall be mailed to:
NC DENR / DWQ /Information Processing Unit
1617 Mail Service Center
Raleigh, North Carolina 27699-1617

Permit NC0088200
Updated blank reporting and other forms may be downloaded from the Aquifer Protection Section's
website [http://h2o.enr.state.nc.uslaps/gpu.htm]. Copies of blank forms may also be requested from
the above address.
Applicable Boundaries
a. The COMPLIANCE BOUNDARY for the surface disposal unit is specified by
15A NCAC 2L [Groundwater Classifications and Standards]. The Compliance
Boundary for the disposal system individually permitted on or after December 31,
1983 is established at either 250 feet from the waste disposal area or 50 feet
within the property boundary, whichever is closer to the waste disposal area. An
exceedance of Groundwater Quality Standards at or beyond the Compliance
Boundary is subject to remediation action according to 15A NCAC 2L.0106 (d)(2).
b. The REVIEW BOUNDARY is established around the surface disposal unit
midway between the Compliance Boundary and the perimeter of the surface
disposal unit. Any exceedance of Groundwater Quality Standards at the Review
Boundary shall require action according to 15A NCAC 2L.0106 (d)(1).
Additional Requirements
Any additional groundwater quality monitoring deemed necessary by the Division shall be
performed by the Permittee.

RE: draft modification for NC0088200
Subject: RE: draft modification for NC0088200
From: "Huffinan, Morgan" <[e-mail]>
Date: Wed, 14 Nov 2007 09:49:18 -0500
To: "Charles Weaver" <[e-mail]>
Charles,
The only thing I see is in section A.(2)under Applicable Boundaries a.
the referenced administrative code should be 15A NCAC 2L.0106
(d)(2)[Compliance Boundary], rather than 15A NCAC 2L.0106 (d)(1)[Review
Boundary].
Thankyou for taking care of this,
Morgan Huffman
Original Message
From: Charles Weaver [mailto:[e-mail]]
Sent: Tuesday, November 13, 2007 10:10 AM
To: Huffman, Morgan; Steve Mauney
Cc: Steve Tedder
Subject: draft modification for NC0088200
Gentlemen,
Please review this draft permit for the requested modification at the
Thomasville WTP. Send me your comments by Friday afternoon.
I plan to issue the modification next week.
Thanks,
CHW
*************************************************************************************************
* This email and any files transmitted with it are confidential and intended solely *
* for the use of the individual or entity to whom they are addressed. If you have *
* received this email in error please notify the system manager or email: *
* [e-mail]. Please note that any views or opinions
* presented in this email are solely those of the author and do not necessarily
* represent those of Thomasville City Government. This email and any file *
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* should check this email and any attachments for the presence of viruses. *
* The City of Thomasville accepts no liability for any damage caused by any *
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1 of 1 1 1/21/2007 7:38 AM

Re: draft modification for NC0088200
Subject: Re: draft modification for NC0088200
From: Steve Mauney <[e-mail]>
Date: Tue, 13 Nov 2007 10:21:35 -0500
To: Charles Weaver <[e-mail]>
CC: [e-mail], Steve Tedder <[e-mail]>
It would read a little smoother to put the force main just below the pump station.
Thanks for handling this Charles.
Steve Mauney
NC DENR Winston-Salem Regional Office
Division of Water Quality, Water Quality Section
585 Waughtown Street
Winston-Salem, NC 27107
Voice: [phone]
Main # [phone]
FAX: [phone]
On 11/13/2007 10:09 AM, Charles Weaver wrote:
Gentlemen,
Please review this draft permit for the requested modification at the
Thomasville WTP. Send me your comments by Friday afternoon.
I plan to issue the modification next week.
Thanks,
CHW
Steve Mauney <Steve.Mauney(a,NCmail.net>
WSRO
NC DENR
1 of 1
11/13/2007 10:21 AM

[Fwd: RE:.[Fwd: Alum Lagoon Permits NC0088200 and WQ0000425]]
Alum Lagoon Permits NC0088200 and WQ0000425
From:
"Huffman, Morgan" <huffmanm ci,ci.thomasville.nc.us>
Date:
Fri, 2 Nov 2007 14:14:27 -0400
To:
<susan.a.wilson(2 ncmail.net>
Ms. Wilson,
A Sst4,J fl s M„pto2
/koO
Re2ii u, .
54s-el) pnj I • o i-
toni
or-
I would like to request a minor modification of permit #NC0088200 to facilitate the
rescission of permit #WQ0000425. The modifications sought are: 1) Transfer of the three
groundwater monitoring wells form permit #WQ0000425 to permit #NC0088200; 2)
Clarification that the 4.3 acre supernatant lagoon is only proposed; 3) Specification of the
pump station capacity as 350 GPM; and 4) Specification that the force main consists of
approximately 14,000 linear feet of 8" force main.
The above modifications have been arrived at thru discussions between Ed Hardee (DWQ),
Steve Tedder (DWQ), Steve Mauney (DWQ), Randy Hammitt (City of Thomasville), and
myself. Hopefully the above minor modifications, proposed by DWQ staff, can be made to
the permit #NC0088200 and allow the rescission of permit #WQ0000425, as they are
redundant. If you have any questions please email me and we can attempt to bring this to a
close.
Sincerely,
Morgan Huffman
Public Services Director
City of Thomasville
IMPORTANT NOTICE
This email and any files transmitted with it are confidential and intended solely for the use of the
individual or entity to whom they are addressed. If you have received this email in error, please
notify your system manager or email: metcalfaci.thomasville.nc.us for instructions. Please note
that any views or opinions expressed in this email are solely those of the author and do not
necessarily represent those of Thomasville City Government. This email and any file attached to it
have been scanned for viruses by Norton Corporate Version 10.1 However, the recipient is
strongly urged to make sure this email and attachments has also been scanned at the recipient's
location as well. The City of Thomasville accepts no responsibility or liabilty for any damages or
costs caused by any virus transmitted by this email.
City of Thomasville MIS Department
10 Salem Street, Thomasville, NC 27360 USA www.ci.thomasville.nc.us
2 of 3 11/6/2007 9:36 AM

[Fwd: RE: [Fwd: Alum Lagoon Permits NC0088200 and WQ0000425]]
Subject: [Fwd: RE: [Fwd: Alum Lagoon Permits NC0088200 and WQ0000425]]
From: Sergei Chernikov <[e-mail]>
Date: The, 06 Nov 2007 10:01:46 -0400
To: Susan Wilson <[e-mail]>
Susan,
This is definitely as minor modification, please assign to the next in line.
Thank you!
Sergei
Original Message
Subject:RE: [Fwd: Alum Lagoon Permits NC0088200 and WQ0000425]
Date:Mon, 5 Nov 2007 15:57:09 -0500
From:"Huffman, Morgan" <huffmanmaci.thomasville.nc.us>
To:"Sergei Chernikov" <sergei.chernikov(ai,ncmail.net>
References: <472B97A4.4010906(2 ncmail.net> <472F 112D.1020404Cagicmail.net>
Sergei,
Please find attached, in pdf form, the groundwater wells language from WQ0000425.
Thank you,
Morgan Huffman
From: Sergei Chernikov[mailto:[e-mail]]
Sent: Monday, November 05, 2007 7:49 AM
To:. Huffman, Morgan
Subject: Re: [Fwd: Alum Lagoon Permits NC0088200 and WQ0000425]
Mr. Huffman,
Please e-mail us the language regarding the groundwater wells from the WQ0000425 and we
will proceed with your modification request.
Sergei
Sergei Chernikov, Ph.D.
Environmental Engineer
NPDES Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
phone: [phone] ext. 594
fax: [phone]
Subject:
1 of 3 11/6/2007 9:36 AM

[Fwd: REi, [Fwd: Alum Lagoon Permits NC0088200 and WQ0000425]]
•
IMPORTANT NOTICE
This email and any files transmitted with it are confidential and intended solely for the use of the
individual or entity to whom they are addressed. If you have received this email in error, please
notify your system manager or email: metcalfiAci.thomasville.nc.us for instructions. Please note
that any views or opinions expressed in this email are solely those of the author and do not
necessarily represent those of Thomasville City Government. This email and any file attached to it
have been scanned for viruses by Norton Corporate Version 10.1 However, the recipient is
strongly urged to make sure this email and attachments has also been scanned at the recipient's
location as well. The City of Thomasville accepts no responsibility or liabilty for any damages or
costs caused by any virus transmitted by this email.
City of Thomasville MIS Department
10 Salem Street, Thomasville, NC 27360 USA www.ci.thomasville.nc.us
Sergei Chernikov, Ph.D.
Environmental Engineer
NPDES Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
phone: [phone] ext. 594
fax: [phone]
Content -Type: application/ octet -stream
;WQ0000425 Section IV page 1.pdf ;Content -Encoding: base64
Content -Type: application/octet-stream
WQ0000425 Section IV page 2.pdf
Content -Encoding: base64
3 of 3 11/6/2007 9:36 AM

e. Any spillage or discharge from a vehicle or piping system transporting residuals to the
surface disposal unit.
Persons reporting such occurrences by telephone shall also file a written report in.letterform
within five days following first knowledge of the occurrence. This report must outline the
actions taken or proposed to be taken to ensure that the problem does not recur.
IV. GROUNDWATER REOULREMENTS
1. Sampling Requirements:
a. The three existing monitor wells (MW-1, MW-2, . and MW-3) shall be sampled every
November for the following parameters: /
pH '7 Nickel
Water Level / Arsenic J
.TDS TOC
Volatile Organic Compounds (VOCs)
Water levels in the groundwater monitoring wells shall be measured prior to sampling the
groundwater for the remaining parameters. The depth to water in each well shall be
measured from the surveyed point on the top of the casing, which shall be surveyed
relative to a common datum.
b. For Total Organic Carbon (TOC), if concentrations greater than 10 mg/I are detected in
any down -gradient monitoring well, additional sampling and analysis must be conducted
to identify the individual constituents comprising this TOC concentration.. If the TOC
concentration as measured in the background monitor well exceeds 10 mg/I, this
concentration will be taken to represent the naturally occurring TOC concentration. Any
exceedances of this naturally occurring TOC concentration in the down -gradient wells
shall be subject to the additional sampling and analysis as described above.
c. ForVolatile Organic Compounds (VOCs), use only one of the following methods:
1) Standard Method 6230D, Practical Quantitation Limit (PQL) at 0.5 ug/L or less
2) Standard Method 6210, PQL at 0.5 ug/L or less
3) EP4 Method 8021, Low Concentration, PQL at 0.5 ug/L or less
4) EPA Method 8260, Low Concentration, PQL at 0.5 ug/L or less, or
5) Another method with prior approval by the Aquifer Protection Section Chief.
• Any of the referenced methods used for VOCs must, at a minimum, include all the
constituents listed in Table VJII of Standard Method 6230D. Any method used must
provide a PQL of 0.5 ug/L or less, which must be supported by laboratory proficiency
studies as required by the DWQ Laboratory Certification Unit. Any constituents detected
above the Method Detection Limit (MDL) but below the PQL if 0.5. ug/L must be
qualified (estimated) and reported.
d. Any laboratory selected to analyze parameters shall be Division -certified for those
parameters required.

2. Reporting/Documentation Requirements:
a. The results of the sampling and analysis shall be received on the most -recent version of
"Groundwater Quality Monitoring: Compliance Report Form" (i.e., GW-59 Form), with
copies of the laboratory analyses attached, by the Division's Groundwater Section on or
before the last working day of the month following the sampling month.
b. All reports, maps, and other documents required in the "Groundwater Requirements"
section of this permit shall be mailed to the following address:
NCDENR: DWQ
Information Processing Unit
1617 Mail Service Center
Raleigh, NC • 27699-1617
Updated blank reporting and other forms may be downloaded from the web site for the
Division's Aquifer Protection Section at http://gw.ehnr.state.nc.us/ or requested from the
address listed above.
3. .Applicable Boundaries:
a: 'The COMPLIANCE BOUNDARY for the surface disposal unit is specified by
regulations in 15A NCAC 2L, Groundwater Classifications and Standards. The
Compliance Boundary for the disposal system individually permitted on or after
December 31, 1983 is established at either (1) 250 feet from the waste disposal area, or
50 feet within the property boundary, whichever is closer to the waste disposal area. An
exceedance of Groundwater Quality Standards at or beyond the Compliance Boundary is
subject to remediation action according to 15A NCAC 2L .0106(d)(2).
b. The REVIEW BOUNDARY is established around the surface disposal unit midway
between the Compliance Boundary and the perimeter of the surface disposal unit. Any
exceedance of Groundwater Quality Standards at the Review Boundary shall require
action in accordance with 15A NCAC 2L .0106 (d)(1).
4. Additional Requirements:
a. Any additional groundwater quality monitoring, as deemed necessary by the Division,
shall be provided.
V. INSPECTIONS
1. _ .. The Permittee or.his designee shall inspect the residuals conveyance facilities and/or surface
disposal unit to prevent malfunctions and deterioration, operator errors and discharges which
may cause or lead to the release of wastes to the environment, a threat to human health, or a
nuisance. The Permittee shall maintain an inspection log or summary including at least the
date and time of inspection; observations made; and any maintenance, repairs,or corrective
actions taken by.the Permittee. This log of inspections shall be maintained by the Permittee
for a period of five years from the date of the inspection and shall be made available to the
Division or other permitting authority, upon request.
7

Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P.E. Director
.Division of Water Quality
• . b 25, 2005
M . RANDALL D. HAMMITT, WTP SUPERINTENDEN
CITY OF THOMASVILLE
POST OFFICE BOX 368
THOMASVILLE, NORTH CAROLINA 27360 .�. �.� R� .Office
ject: Permit No. WQ0000425 ei0 ' w'
City of Thomasville
Thomasville Water Treatment Plant
Alum Residual Disposal Lagoon (503 exempt)
Davidson County
Dear Mr. Hammi
In accordance with your permit renewal request received on January 10, 2005, we are forwarding
herewith Permit No. WQ0000425, dated August 25, 2005, to the City of Thomasville for the continued
operation of an alum residual storage and disposal facility.
This permit shall be effective from the date of issuance until July 31, 2010; shall void Permit No.
WQ0000425, issued on May 15, 2000; and shall be subject to the conditions and limitations as specified
therein. Please pay particular attention to the monitoring requirements in this permit. New requirements
include the establishment of two level gauges (Conditions I.1 and 1.2), the establishment and maintenance
of a protective vegetative cover (Condition 1I.8), and residuals sampling (at five-year and one-year
intervals, as stated under Conditions 111.2 and 111.3, respectively). Failure to establish an adequate system
for collecting and maintaining the required operational information will result in future compliance
problems. Please also make note of this permit's expiration date and the fact that a permit renewal is due
to the Division no later than six months prior to that date, as the Division does not send reminders to
apply for permit renewal.
If any parts, requirements, or limitations contained in this permit are unacceptable, you have the
right to request an adjudicatory hearing upon written request within 30 days following receipt of this
permit. This request must be in the form of a written petition, conforming to Chapter 150B of North
Carolina General Statutes, and filed with the Office of Administrative Hearings, 6714 Mail Service
Center, Raleigh, NC 27699-6714. Unless such demands are made, this permit shall be final and binding.
If you need any additional information concerning this matter, please contact Mr. David Goodrich
by telephone at [phone], or via e-mail at [e-mail]'
Sincer
for Alan W. Klimek, P.E.
cc: Davidson County Health Department
Winston-Salem Regional Office, Aquifer Protection Section
Technical Assistance and Certification Unit
Aquifer Protection Central Files
Permit Files
LAU Residuals Program Coordinator
Aquifer Protection Section 1636 Mail Service Center Raleigh, NC 27699-1636
Internet: http://h2o.enr.state.nc.us 2728 Capital Boulevard Raleigh, NC 27604
Phone [phone] Customer Service
Fax [phone]
An Equal Opportunity/Affirmative Action Employer— 50% Recycled/10% Post Consumer Paper
r- t t rl, i.
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, Vaturi

NORTH CAROLINA
ENVIRONMENTAL MANAGEMENT COMMISSION
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
RALEIGH
SURFACE DISPOSAL OF RESIDUAL SOLIDS (503 EXEMPT) PERMIT
In accordance with the provisions of Article 21 of Chapter 143, General Statutes of North Carolina as
amended, and other applicable Laws, Rules, and Regulations
PERMISSION IS HEREBY GRANTED TO
City of Thomasville
Davidson County
FOR THE
continued operation of an Alum Residual Lagoon system consisting of a 350 GPMpur ip station with
approximately 14,000 linear feet of eight -inch force__ main, a residual receiving station with a sloped .,
_Rom re_te.—pad and six-incch. rr vity flow sewer nine to discharge into a 2.1-acre residual settling lagoon, a •
decanting structure with height adjustable telescoping valves, a rip -rap effluent discharge channel to
discharge supernatant into a 4.3-acre la ith no discharge of wastes to the surface waters, pursuant
to the renewal application received on January 10, 2005 and in conformity with the project plan,
specifications, and other supporting data subsequently filed and approved by the Department of
Environment and Natural Resources and considered a part of this permit.
This permit shall be effective from the date of issuance until July 31, 2010; shall void Permit No.
WQ0000425, issued on May 15, 2000; and shall be subject to the following specified conditions and
limitations:
I. PERFORMANCE STANDARDS
1. Two level gauges, one to monitor waste levels in the 2.1-acre residual settling lagoon and the
other to monitor water levels in the 4.3-acre discharge lagoon , shall be installed within
ninety (90) calendar days of the issuance of this permit. Each gauge shall have readily visible
permanent markings indicating the maximum liquid level at the top of the temporary liquid
storage volume, minimum liquid level at the bottom of the temporary liquid storage volume,
and top of the dam elevations. The certification from the North Carolina -licensed
professional engineer required in Condition 1.2 shall serve as proof of compliance with this
condition.
1

2. Within thirty (30) calendar days of completing the installation of both a level gauges, a
certification shall be received from a North Carolina -licensed professional engineer certifying
that each level gauge has been installed in accordance with this permit. The Permittee shall
mail one copy of the final certification to the NDPU Residuals Program Coordinator,
NCDENR-DWQ, Aquifer Protection Section, 1617 Mail Service Center, Raleigh, NC
27699-1617.
3. The residuals conveyance facilities and alum residual lagoons shall be effectively maintained
and operated as a non -discharge system to prevent the discharge of any wastes resulting from
the operation of the unit.
4. The issuance of this permit shall not relieve the Permittee of the responsibility for damages to
surface waters or groundwater resulting from the operation of the surface disposal unit.
5. No residuals other than the following are hereby approved for disposal in the Alum Residual
Lagoons in accordance with this permit:
Source County Maximum Dry Tons per Year
Thomasville WTP
Davidson 113.1
6. Only residuals that are non -hazardous under the Resource Conservation and Recovery Act
(RCRA) shall be disposed in the surface disposal unit.
7. The pollutant concentrations in the residuals that will be disposed of in the surface disposal
. unit shall not exceed the following Ceiling Concentrations (i.e., dry .weight basis):
Parameter _
Ceiling Concentration
. (milligrams per kilogram)
Arsenic •
•
30 .
Chromium
•
200
Nickel
210
8. Level gauges shall be maintained at all times to monitor freeboard levels in the surface
disposal unit.
9. The following buffer zones shall be maintained: _
a. 400 feet between an active surface disposal unit and any habitable residence;
b. 100 feet between an active surface disposal unit and any public or private water supply
source, all streams classified as WS or B, waters classified as SA or SB and any Class I
or Class II impounded reservoir used as a source of drinking water;
c. 100 feet between an active surface disposal unit and any stream, lake, river, or natural
drainage way;
d. 50 feet between an active surface disposal unit and property lines (if the original permit
was issued with the buffer distance to property line as 100 feet, updated maps must be
submitted and new acreage delineated for the buffer to be reduced);

e. 10 feet between an active surface disposal unit and any interceptor drains or surface water
diversions (upslope);
f. 25 feet between an active surface disposal unit and any interceptor drains or surface water
diversions (downslope); and
g. 25 feet between an active surface disposal unit and any groundwater lowering and surface
drainage ditches.
Some of the buffers specified above may not have been included in previous permits for this
surface disposal unit. These buffers are not intended to prohibit or prevent modifications that
are required by the Division to improve performance of the existing unit. These buffers do,
however, apply to modifications of the unit. These buffers do also apply to any expansion or
modification of the unit and apply in instances in which the sale of property would cause any
of the buffers now complied with, for the surface disposal unit, to be violated. The Permittee
is advised that any modifications to the existing surface- disposal unit shall require a permit
modification.
II. OPERATION AND MAINTENANCE REQUIREMENTS
1. The residuals conveyance facilities and surface disposal unit shall be properly maintained and
operated at all times.. - -
2; *Upon classification by the Water Pollution Control System Operators Certification Commission
(WPCSOCC), the Permittee shall designate and employ a certified operator to be in responsible
charge (ORC) and one or more certified operator(s) to be back-up ORC(s) of the surface
disposal unit in accordance with 15A NCAC 8G .0201. The ORC shall visit the unit in
accordance with 15A NCAC 8G .0204 or as specified in this permit and shall comply with all
other conditions specified in these rules.
3. A copy of this permit shall be maintained on site when residuals are being conveyed and/or
disposed of in, the surface disposal unit during the life of this permit. A spill prevention and
control plan shall be maintained on site at all times.
4. . Freeboard of the surface disposal unit shall not be less than two feet at any time. The freeboard
levels in the unit shall be monitored by 'an individual level gauge that has readily visible
permanent markings indicating the maximum liquid level at the top of the temporary liquid
storage volume; minimum liquid level at the bottom of the temporary liquid storage volume,
and top of the dam (i.e., at its lowest elevation within the unit) elevations. Freeboard levels at
the unit shall be monitored and recorded every day that a residuals disposal event occurs, every
day that a supernatant decanting event occurs, and not less than weekly otherwise.
5. Supernatant from the 2.1-acre residual settling lagoon surface disposal unit shall be collected
and discharged to the 4.3-acre lagoon. Diversion or bypassing of the supernatant shall be
strictly prohibited.
6. Adequate provisions shall be taken to prevent wind erosion from conveying pollutants or
residuals from the surface disposal unit onto the adjacent property or into any surface waters.
7. Adequate provisions shall be taken to prevent any surface runoff from occurring from the
surface disposal unit. If runoff cannot be prevented, a collection system shall be installed with
the capacity to handle runoff from a 24-hour, 25-year storm event. All collected runoff shall be
disposed in a manner approved by the Division.
3

8. A protective vegetative cover shall be established and maintained on the embankments of the
2.1-acre residual settling lagoon surface disposal unit and the 4.3-acre lagoon that receives
supernatant (i.e., outside toe of the embankments) to maximum liquid level), berms, pipe runs,
erosion control areas, and surface water diversions. Trees, shrubs, and other woody vegetation
shall not be allowed to grow on the unit dikes or embankments. All embankment areas shall be
kept mowed or otherwise controlled and accessible.
9. Appropriate measures shall be taken to control public access to the surface disposal unit during
active use and for the 36-month period following closure of the surface disposal unit. Such
controls may include fencing and the posting of signs indicating the activities being conducted
at the unit.
III. MONITORING AND REPORTING REQUIREMENTS
1. Any monitoring (i.e., including groundwater, surface water, residuals, soil, or plant tissue
analyses) deemed necessary by the Division to insure protection of the environment shall be
established and an acceptable sampling and reporting schedule shall be followed.
2. Residuals generated by the approved residuals source -generating facility listed in Condition
I.6 shall be analyzed to demonstrate that they are non -hazardous under RCRA every. five
years. A corrosivity, ignitability, and reactivity analysis, as well as a Toxicity Characteristics
Leaching Procedure (TCLP) analysis shall be conducted on residuals generated by each
approved residuals source -generating facility. If residuals generated by a particular residuals
source -generating facility are disposed of in the surface disposal unit at a frequency less than
annually, the analyses shall be required for each calendar year in which a disposal event
occurs. The results of all analytical determinations shall be maintained on file by the
Permittee for a minimum of five years.
The TCLP analysis shall include the following parameters (i.e., note the regulatory level in
milligrams per liter in parentheses):
Arsenic (5.0)
Barium (100.0)
Benzene (0.5) •
Cadmium (1.0)
Carbon tetrachloride (0.5)
Chlordane (0.03)
Chlorobenzene (100.0)
Chloroform (6.0)
Chromium (5.0)
m-Cresol (200.0)
o-Cresol (200.0)
p-Cresol (200.0)
Cresol (200.0)
2,4-D (10.0) •
1,4-Dichlorobenzene. (7.5)
1,2-Dichloroethane (0.5)
1,1-Dichloroethylene (0.7)
2,4-Dinitrotoluene (0.13)
Endrin (0.02)
Hexachlorobenzene (0.13)
Heptachlor (and its hydroxide) (0.008)
Hexachloro-1,3-butadiene (0.5)
Hexachloroethane (3.0)
Lead (5.0)
Lindane (0.4)
Mercury (0.2)
Methoxychlor (10.0)
Methyl ethyl ketone (200.0)
Nitrobenzene (2.0)
Pentachlorophenol (100.0)
Pyridine (5.0)
Selenium (1.0)
Silver (5.0)
Tetrachloroethylene (0.7)
Toxaphene (0.5)
Trichloroethylene (0.5)
2,4,5-Trichlorophenol (400.0)
2,4,6-Trichlorophenol (2.0)
2,4,5-TP (Silvex) (1.0)
Vinyl chloride (0.2)
3. A representative analysis shall be conducted on residuals generated by the approved residuals
source -generating facility listed in Condition I.6 annually by the Permittee, and the results of
all analytical determinations shall be maintained on file by the Permittee for a minimum of
five years. The analysis shall include, but is not necessarily limited to, the following
parameters:
4

Arsenic
Chromium
Nickel
Percent Total Solids
pH
4. Laboratory analysis as required by Condition III.1, Condition III.2, and Condition 111.3 shall
be performed/gathered on the residuals as they are to be disposed of in the surface disposal
unit. Furthermore, analytical determinations made pursuant to the monitoring and reporting
requirements of this permit shall be made by a laboratory certified by the Division for the
required parameter(s) under 15A NCAC 2H .0800 or 15A NCAC 2H .1100.
5. Proper records shall be maintained by the Permittee tracking all application activities
associated with the surface disposal unit. All records shall be kept by the Permittee for a
minimum of period of five years from the date of disposal. These records shall include, but
are not necessarily limited to, the following information:
a. Date and freeboard level measurements in the surface disposal unit; .
b. Source and date or residuals disposed of in the surface disposal unit; -
c. Volume of residuals disposed of in the surface disposal unit in gallons per. year, dry tons
per year, or kilograms per year;
d. Cumulative volume of residuals disposed of in the surface disposal unit in gallons or
cubic yards (i.e., excluding freeboard);
e. Remaining volume in the surface disposal unit in gallons or cubic yards (i.e., excluding
freeboard); and
f. An estimate of the remaining useful disposal life. for the surface disposal unit in years
(i.e., excluding freeboard).
Three copies of all required monitoring and reporting requirements as specified in. Condition
III. 1, Condition III. 2, Condition III. 3, and Condition III. 5 shall be submitted annually on or
before March 1st of the year following the disposal event to the following address:
NCDENR-DWQ
Information Processing Unit
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
7. Noncompliance Notification:
The Permittee shall report by telephone to the Aquifer Protection Section of the Division's
Winston-Salem Regional Office, telephone number [phone], as soon as possible, but
in no case more than 24 hours or on the next working day following the occurrence or first
knowledge of the occurrence of any of the following:
a. Any occurrence with surface disposal activities that results in the disposal of significant
amounts of wastes that are abnormal in quantity or characteristic.
b. Any failure of the surface disposal activities resulting in a release of material to receiving
waters.
c. Any time that self -monitoring information indicates that the surface disposal unit has
gone out of compliance with the conditions and limitations of this permit or the
parameters on which the system was designed.
d. Any process unit failure, due to known or unknown reasons, that renders the surface
disposal unit incapable of adequate residual treatment.

e. Any spillage or discharge from a vehicle or piping system transporting residuals to the
surface disposal unit.
Persons reporting such occurrences by telephone shall also file a written report in letterform
within five days following first knowledge of the occurrence. This report must outline the
actions taken or proposed to be taken to ensure that the problem does not recur.
IV. GROUNDWATER REQUIREMENTS
1. Sampling Requirements:
a. The three existing monitor wells (MW-1., MW-2, and MW-3) shall be sampled every
November for the following parameters: •
Chromium Lead. pH Nickel
TDS TOC Water Level • Arsenic
Volatile Organic Compounds (VOCs)
Water levels in the groundwater monitoring wells shall be measured prior to sampling the
groundwater for the remaining parameters. The depth to water in each well shall be
measured from the surveyed point on the top of the casing, which shall be surveyed
relative to a common datum.
b. For Total Organic Carbon (TOC),. if concentrations greater than 10 mg/1 are detected in
any down -gradient monitoring well, additional sampling and analysis must be conducted
to identify the individual constituents comprising this TOC concentration. If the TOC
concentration as measured ' in the background monitor well exceeds 10 mg/1, this
concentration will be taken to represent the naturally occurring TOC concentration. Any
exceedances of this naturally occurring TOC concentration in the down -gradient wells
shall be subject to the additional sampling and analysis as described above.
c. For Volatile Organic Compounds (VOCs), use only one of the following methods:
1) Standard Method 6230D, Practical Quantitation Limit (PQL) at 0.5 ug/L or less
2) . Standard Method 6210, PQL at 0.5 ug/L or less
3). EPA Method 8021, Low Concentration, PQL at 0.5 ug/L or less
4) EPA Method 8260, Low Concentration, PQL at 0.5 ug/L or less, or
5) Another method with prior approval by the Aquifer Protection Section Chief.
Any of the referenced methods used for VOCs must, at a minimum, include all the
constituents listed in Table VIII of Standard Method 6230D. Any method used must
provide a PQL of 0.5 ug/L or less, which must be supported by laboratory proficiency
studies as required by the DWQ Laboratory Certification Unit. Any constituents detected
above the Method Detection Limit (MDL) . but below the PQL if 0.5 ug/L must be
qualified (estimated) and reported.
d. Any laboratory selected to analyze parameters shall be Division -certified for those
parameters required.
6

2. Reporting/Documentation Requirements:
a. The results of the sampling and analysis shall be received on the most -recent version of
"Groundwater Quality Monitoring: Compliance Report Form" (i.e., GW-59 Form), with
copies of the laboratory analyses attached, by the Division's Groundwater Section on or
before the last working day of the month following the sampling month.
b. All reports, maps, and other documents required in the "Groundwater Requirements"
section of this permit shall be mailed to the following address:
NCDENR-DWQ
Information Processing Unit
1617 Mail Service Center
Raleigh, NC- 27699-1617
Updated blank reporting and other forms may be downloaded from the web site for the
Division's Aquifer Protection Section at http://gw.ehnr.state.nc.us/ or requested from the
address listed above.
Applicable Boundaries:
a. The COMPLIANCE BOUNDARY. for the surface disposal unit is specified by
regulations in .15A NCAC •2L, Groundwater Classifications and Standards. The
Compliance Boundary for the . disposal system individually permitted on or after
December 31, 1983 is established at either (1) 250 feet from the waste disposal area, or
50 feet within the property boundary, whichever is closer to the waste disposal area. An
exceedance of Groundwater Quality Standards at or beyond the Compliance Boundary is
subject to remediation action according to. 15A NCAC 2L .0106(d)(2).
b. The REVIEW BOUNDARY is established around the surface disposal unit midway
between the Compliance Boundary and the perimeter of the surface disposal unit. Any
exceedance of Groundwater Quality Standards at the Review Boundary shall require
action in accordance with 15A NCAC 2L .0106 (d)(1).
Additional Requirements:
a. Any additional groundwater quality monitoring, as deemed necessary by the Division,
shall be provided.
V. INSPECTIONS
1. The Permittee or his designee shall inspect the residuals conveyance facilities and/or surface
disposal unit to prevent malfunctions and deterioration, operator errors and discharges which
may cause or lead to the release of wastes to the environment, a threat to human health, or a
nuisance. The Permittee shall maintain an inspection log or summary including at least the
date and time of inspection; observations made; and any maintenance, repairs, or corrective
actions taken by the Permittee. This log of inspections, shall be maintained by the Permittee
for a period of five years from the date of the inspection and shall be made available to the
Division or other permitting authority, upon request.
7

2. Any duly authorized officer, employee, or representative of the Division may, upon
presentation of credentials, enter and inspect any property, premises, or place on or related to
the residuals conveyance facilities and/or surface disposal unit at any reasonable time for the
purpose of determining compliance with this permit; inspect or copy any records that must be
kept under the terms and conditions of this permit; and obtain samples of groundwater,
surface water, or leachate.
VI. GENERAL CONDITIONS
1. A set of all plans and specifications approved by the Division, as well as any as -built plans
for the residuals conveyance facilities and surface • disposal unit shall be retained by the
Permittee for the life of the facilities/unit.
2. This permit shall become voidable unless the disposal activities are carried out in accordance
with the conditions of this permit, the supporting materials,. and in the manner approved by
this Division.
3. This permit shall be effective only with respect to the nature and volume of wastes described
in the application and other supporting data.
4. This permit shall not be automatically transferable. In the event that there is a desire for the
residuals conveyance facilities and surface disposal unit to change ownership or a name
change of the Pennittee, a formal permit request shall be submitted to the Division
accompanied by documentation from the parties involved and other supporting materials as
may be appropriate. The approval of this request shall be considered on its merits and may or
may not be approved. •
5. Failure to abide by the conditions and limitations contained in this permit may subject the
Permittee to an enforcement action. by the Division. in accordance with North Carolina
General Statutes §143-215.6A through §143-215.6C.
6. The annual administering and compliance fee shall be paid by the Permittee within 30 days
after being billed by the Division. Failure to pay the fee accordingly may cause the Division
to initiate action to revoke this permit as specified by 15 NCAC 2H .0205 (c)(4).
7. The issuance of this permit does not preclude the Permittee from complying with any and all
statutes, rules, regulations, or ordinances which may, be - imposed by other government
agencies (i.e., local, state, and federal) which have jurisdiction, including, but not limited to,
applicable river buffer rules in 15A NCAC 2B .0200, erosion and sedimentation control
requirements in 15A NCAC Chapter 4 and. under the Division's General Permit NCG010000,
and any requirements pertaining to wetlands under 15A NCAC 2B .0200 and 15A NCAC 2H
.0500. -
8. The Permittee, at least six months prior to the expiration of this permit, shall request its
extension. Upon receipt of the request, the Division shall review the_ adequacy of the surface
disposal unit described therein and, if warranted, shall extend the permit for such period of
time and under such conditions and limitations as it may deem appropriate.
9. This permit may be modified, or revoked and/or reissued to incorporate any conditions,
limitations, and monitoring requirements the Division deems necessary in order to protect the
environment and public health adequately.
8

10. The Division shall be notified in writing at least 180 days prior to closing of the surface
disposal unit. A formal closure plan and a post -closure management 'care program for the
surface disposal unit shall be submitted at that time. This information shall be specific to the
surface disposal unit as well as relate to the Permittee's future plans for the land. A schedule
for implementing both the closure plan and the post -closure management care program shall
be provided as well. The Division will accept a submittal that has been prepared in
accordance with the document entitled "Process Design Manual: Surface Disposal of Sewage
Sludge and Domestic Septage (EPA/625/R-95/002)," published by the United States
Environmental Protection Agency's .Office of Research and Development. Submit three
copies of all information to the NCDENR-DWQ, Aquifer Protection Section, Land
Application Unit, do LAU Residuals Program Coordinator, 1636 Mail Service Center,
Raleigh, NC 27699-1636.
Permit issued this, the 25th day of August, 2005.
NORTH C O• . LIMA E ' ' ONMENTAL MANAGEMENT COMMISSION
for Alan W. Klimek, P.E., Director
Division of Water Quality
By Authority of the Environmental Management Commission
Permit Number WQ0000425

r ..
•
CIITOF THOMA 1,E
DAVIDSON COUNTY
PERMIT -NO. V/Q0000425
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•FIGURE 2
• CITY OF THOMASVILLE .
ALUM RESIDUAL DISPOSAL LAGQOI
DAVIDSON COUNTY
WQ0000425E -
SITE DETAIL MAP