NC0055786_Permit (Modification)_19950109

State of North Carolina
Department of Environment,
Health and Natural Resources
Division of Environmental Management
James B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary
A. Preston Howard, Jr., P.E., Director
January 9, 1995
Mr. R. Duke Whisenat
28 W. Center Street
Lexington, NC 27292
Subject: NPDES Permit # NC0055786
Lexington Regional WWTP
Davidson County
Dear Mr. Whisenat:
The pretreatment rules in 15A NCAC 2H .0900 have been revised effective November 1, 1994.
• Therefore, the pretreatment requirements for the City of Lexington have changed and your
NPDES permit is hereby modified to reflect these changes. Please insert the enclosed Part III.A-
B into the appropriate place in your current NPDES permit and disregard the old Part III.A-B.
Please note that any original Part III conditions after Part III.B are still in effect and must remain
in the permit.
The main change is found in Part III.B.10 with a change from Semi -Annual Reports (SAR) to
Pretreatment Annual Reports (PAR). Your PAR is due by September 1 of each year and shall
cover activities for the two previous six-month periods. Please include the following periods in
your first annual report:
First six month period: 7/1/94 - 12/31/94
Second six month period: 1/1/95 - 6/30/95
You are reminded that you must still judge compliance for each industrial user for each six-
month period, and take appropriate enforcement action.
The requirements for submission of a PAR are found in Chapter 9 of the Comprehensive
Guidance for North Carolina Pretreatment Programs. The following meetings have been held
or are scheduled to review the PAR requirements.
WSRO
RRO and WARO
ARO
FRO and WIRO
• MRO
December 14, 1994, 9:30 am
January 24, 1995, 10 am
January 24, 1995, 10 am
January 26, 1995, 10 am
as needed
Archie Elledge WWTP
Tar River Regional WWTP
Asheville Regional Office
Fayetteville Regional Office
This permit modification is issued pursuant to the requirements of North Carolina General
Statute 143-215.1 and the Memorandum of Agreement between North Carolina and the US
Environmental Protection Agency dated December 6, 1983.
P. O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled / 10% post -consumer paper

Lexington Regional WWTP
NPDES Permit # NC0055786
Page 2
If any part of this permit modification is 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 in the form of a written petition, conforming to Chapter 150B of the North
Carolina General Statutes, and filed with the Office of Administrative Hearings, Post Office
Drawer 27447, Raleigh, North Carolina 27611-7447. Unless such demand is made, this decision
shall be final and binding.
Please take notice this permit is not transferable. Part II, E.4. addresses the requirements to be
followed in case of change in ownership or control of this discharge.
This permit does not affect the legal requirements to obtain other permits which may be required
by the Division of Environmental Management or permits required by the Division of Land
Resources, Coastal Area Management Act or any other Federal or Local governmental permit
• that may be required.
If you have any questions concerning this permit, please contact the Winston Salem Regional
Office at [phone] or Bo McMinn with the Central Pretreatment Staff at [phone].
incerely, ,
A. Preston •ward, Jr. E.
cc: Jim Patrick, EPA
Winston Salem Regional Office
Permits & Engineering
Pretreatment Files
Central Files
Gisele Comer

Part III.A-B.
Modified 1/9/95
PART III
OTHER REQUIREMENTS
A. Requirements for Control of Pollutants Attribute to Industrial Users.
1. Effluent limitations are listed in Part I of this permit. Other pollutants attributable to
inputs from industries using the municipal system may be present in the permittee's
discharge. At such time as sufficient information becomes available to establish
limitations for such pollutants, this permit may be revised to specify effluent limitations
for any or all of such other pollutants in accordance with best practicable technology or
water quality standards.
2. Under no circumstances shall the permittee allow introduction of the following wastes
in the waste treatment system:
a. Pollutants which create a fire or explosion hazard in the POTW, including, but not
limited to, wastestreams with a closed cup flashpoint of less than 140 degrees
Fahrenheit or 60 degrees Centigrade using the test methods specified in
40CFR 261.21;
b. Pollutants which will cause corrosive structural damage to the POTW, but in no case
Discharges with pH lower than 5.0, unless the works is specifically designed to
accommodate such Discharges;
c. Solid or viscous pollutants in amounts which will cause obstruction to the flow in the
POTW resulting in Interference;
d. Any pollutant, including oxygen demanding pollutants (BOD, etc.) released in a
Discharge at a flow rate and/or pollutant concentration which will cause Interference
with the POTW;
e. Heat in amounts which will inhibit biological activity in the POTW resulting in
Interference, but in no case heat in such quantities that the temperature at the POTW
Treatment Plant exceeds 40°C (104°F) unless the Division, upon request of the
POTW, approves alternate temperature limits;
f. Petroleum oil, nonbiodegradable cutting oil, or products of mineral oil origin in
amounts that will cause interference or pass through;
g. Pollutants which result in the presence of toxic gases, vapors, or fumes within the
POTW in a quantity that may cause acute worker health and safety problems;
h. Any trucked or hauled pollutants, except at discharge points designated by the
POTW.
3. With regard to the effluent requirements listed in Part I of this permit, it may be
necessary for the permittee to supplement the requirements of the Federal Pretreatment
Standards (40 CFR, Part 403) to ensure compliance by the permittee with all applicable
effluent limitations. Such actions by the permittee may be necessary regarding some or
all of the industries discharging to the municipal system.

Part III.A-B.
Modified 1/9/95
4. The permittee shall require any industrial discharges into the permitted system to meet
Federal Pretreatment Standards promulgated in response to Section 307(b) of the Act.
Prior to accepting wastewater from any significant industrial user, the permittee shall
either develop and submit to the Division a Pretreatment Program for approval per
15A NCAC 2H .0907(a) or modify an existing Pretreatment Program per
15A NCAC 2H .0907(b).
5. This permit shall be modified, or alternatively, revoked and reissued, to incorporate or
modify an approved POTW Pretreatment Program or to include a compliance schedule
for the development of a POTW Pretreatment Program as required under Section
402(b)(8) of the Clean Water Act and implementing regulations or by the requirements
of the approved State pretreatment program, as appropriate.
B. Pretreatment Program Requirements
Under authority of sections 307(b) and (c) and 402(b)(8) of the Clean Water Act and
implementing regulations 40 CFR Part 403, North Carolina General Statute 143-215.3 (14)
and implementing regulations 15A NCAC 2H .0900, and in accordance with the approved
pretreatment program, all provisions and regulations contained and referenced in the
Pretreatment Program Submittal are an enforceable part of this permit.
The permittee shall operate its approved pretreatment program in accordance with Section
402(b)(8) of the Clean Water Act, the Federal Pretreatment Regulations 40 CFR Part 403, the
State Pretreatment Regulations 15A NCAC 2H .0900, and the legal authorities, policies,
procedures, and financial provisions contained in its pretreatment program submission and
Division approved modifications there of. Such operation shall include but is not limited to
the implementation of the following conditions and requirements:
1. Sewer Use Ordinance (SUO)
The permittee shall maintain adequate legal authority to implement its approved
pretreatment program;
2. Industrial Waste Survey (IWS)
The permittee shall update its Industrial Waste Survey (IWS) of all users of the sewer
collection system at least once every five years;
3. Monitoring Plan
The permittee shall implement a Division approved Monitoring Plan for the collection
of facility specific data to be used in a wastewater treatment plant Headworks Analysis
(HWA) for the development of specific pretreatment local limits;
4. Headworks Analysis (HWA) and Local Limits
The permittee shall obtain Division approval of a Headworks Analysis (HWA) at least
once every five years, and as required by the Division. The permittee shall develop, in
accordance with 40 CFR 403.5(c) and 15A NCAC 2H .0909, specific Local Limits to
implement the prohibitions listed in 40 CFR 403.5(a) and (b) and
15A NCAC 2H .0909;

Part III.A-B.
Modified 1/9/95
5. Industrial User Pretreatment Permits (IUP) & Allocation Tables
In accordance with NCGS 143-215.1, the permittee shall issue to all significant
industrial users, permits for operation of pretreatment equipment and discharge to the
permittee's treatment works. These permits shall contain limitations, sampling
protocols, reporting requirements, appropriate standard and special conditions, and
compliance schedules as necessary for the installation of treatment and control
technologies to assure that their wastewater discharge will meet all applicable
pretreatment standards and requirements. The permittee shall maintain a current
Allocation Table (AT) which summarizes the results of the Headworks Analysis
(HWA) and the limits from all Industrial User Pretreatment Permits (IUP). Permitted
IUP loadings for each parameter cannot exceed the treatment capacity of the POTW as
determined by the HWA;
6. Authorization to Construct (A to C)
The permittee shall ensure that an Authorization to Construct (A to C) is issued to all
applicable industrial users for the construction or modification of any pretreatment
facility. Prior to the issuance of an Authorization to Construct (A to C), the proposed
pretreatment facility and treatment process must be evaluated for its capacity to comply
with all Industrial User Pretreatment Permit (IUP) limitations;
7. POTW Inspection & Monitoring of their SIUs
The permittee shall conduct inspection, surveillance, and monitoring activities as
described in its Division approved pretreatment program in order to determine,
independent of information supplied by industrial users, compliance with applicable
pretreatment standards. The permittee must:
7a. Inspect all Significant Industrial Users (SIUs) at least once per
calendar year; and
7b. Sample all Significant Industrial Users (SIUs) at least twice per
calendar year for all permit -limited pollutants, once during the
period from January 1 through June 30 and once during the
period from July 1 through December 31, except for organic
compounds which shall be sampled once per calendar year;
8. SIU Self Monitoring and Reporting
The permittee shall require all industrial users to comply with the applicable monitoring
and reporting requirements outlined in the Division approved pretreatment program, the
industry's pretreatment permit, or in 15A NCAC 2H .0908;
9. Enforcement Response Plan (ERP)
The permittee shall enforce and obtain appropriate remedies for violations of all
pretreatment standards promulgated pursuant to section 307(b) and (c) of the Clean
Water Act (40 CFR 405 et.seq.), prohibitive discharge standards as set forth in
40 CFR 403.5 and 15A NCAC 2H .0909, and specific local limitations. All
enforcement actions shall be consistent with the Enforcement Response Plan (ERP)
approved by the Division;

Part III.A-B.
Modified 1/9/95
•, 10. Pretreatment Annual Reports (PAR)
The permittee shall report to the Division in accordance with 15A NCAC 2H .0908. In
lieu of submitting annual reports, Modified Pretreatment Programs developed under
15A NCAC 2H .0904 (b) may be required to meet with Division personnel periodically
to discuss enforcement of pretreatment requirements and other pretreatment
implementation issues.
For all other active pretreatment programs, the permittee shall submit to the Division at
the following address:
NC DEM Pretreatment Group
PO BOX 29535
RALEIGH, NC 27626-0535
Two copies of a Pretreatment Annual Report (PAR) describing its pretreatment
activities over the previous twelve months.
These reports shall be submitted according to a schedule established by the Director and
shall contain the following:
a.) Narrative
A brief discussion of reasons for, status of, and actions taken for all
Significant Industrial Users (SIUs) in Significant Non -Compliance
(SNC);
b.) Pretreatment Program Summary (PPS)
A pretreatment program summary (PPS) on specific forms
approved by the Division;
c.) Significant Non -Compliance Report (SNCR)
The nature of the violations and the actions taken or proposed to
correct the violations on specific forms approved by the Division;
d.) Industrial Data Summary Forms (IDSFF
Monitoring data from samples collected by both the POTW and the
Significant Industrial User (SIU). These analytical results must be
reported on Industrial Data Summary Forms (IDSF) or other
specific format approved by the Division;
e.) Other Information
Copies of the POTW's allocation table, new or modified
enforcement compliance schedules, public notice of SIUs in SNC,
and any other information, upon request, which in the opinion of
the Director is needed to determine compliance with the
pretreatment implementation requirements of this permit;
11. Public Notice
The permittee shall publish annually a list of Significant Industrial Users (SIUs) that
were in Significant Non -Compliance (SNC) as defined in the permittee's Division
approved Sewer Use Ordinance with applicable pretreatment requirements and
standards during the previous twelve month period. This list shall be published within
two months of the applicable twelve month period;

Part III.A-B.
Modified 1/9/95
12. Record Keeping
The permittee shall retain for a minimum of three years records of monitoring activities
and results, along with support information including general records, water quality
records, and records of industrial impact on the POTW;
13. Funding and Financial Report
The permittee shall maintain adequate funding and staffing levels to accomplish the
objectives of its approved pretreatment program;
14. Modification to Pretreatment Programs
Modifications to the approved pretreatment program including but not limited to local
limits modifications, POTW monitoring of their Significant Industrial Users (SIUs),
and Monitoring Plan modifications, shall be considered a permit modification and shall
be governed by 15 NCAC 2H .0114 and 15A NCAC 2H .0907.
NOTE:
ALL OTHER PART III CONDITIONS IN THE ORIGINAL
NPDES PERMIT ARE STILL IN EFFECT.