NC0055786_Permit (Issuance)_20041013

NPDES DOCUMENT SCANNINe COVER SHEET
NPDES Permit:
NC0055786
Lexington Regional WWTP
Document Type:
'Permit Issuance;).
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Correspondence
Owner Name Change
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
October 13, 2004
This document is printed on reuse paper - ignore any
content on the rejrerse side

October 13, 2004
Mr. Roger Spach
Water Resources Superintendent
The City of Lexington
28 West Center Street
Lexington, North Carolina.27292
Dear Mr. Spach:
Michael F. Easley, Governor
State of North Carolina
William G. Ross, Jr., Secretary
Department of Environment and Natural Resources
Alan W. Klimek, P.E., Director
Division of Water Quality
Subject: NPDES Permit Issuance
Permit NC0055786
Lexington Regional WWTP
Davidson County
Division personnel have reviewed and approved your application for modification of the subject
permit. Accordingly, we are forwarding the attached NPDES discharge permit. This permit is issued
pursuant to the requirements of North Carolina General Statute 143-215.1 and the Memorandum of
Agreement between North Carolina and the U.S. Environmental Protection Agency dated May 9, 1994
(or as subsequently amended.)
The permit authorizes the City of Lexington to discharge up to 6.5 MGD of municipal
wastewater from the Lexington Regional WWTP to Abbotts Creek, a class WS-V and B water in the
Yadkin -Pee Dee River Basin. The permit includes discharge limitations and/or monitoring for flow,
BOD5, ammonia nitrogen, total suspended solids (TSS), dissolved oxygen, total phosphorus, and chronic
toxicity, in addition to several metals.
The final permit contains the following modifications from your current permit:
• The inclusion of Section A.(2). which contains effluent limitations and monitoring
requirements for the expansion flow of 6.5 MGD. Please note the changes to
monthly average and weekly average limits for ammonia nitrogen, and the daily
maximum limits for total mercury and phenols. The reduced ammonia nitrogen
limits are given based on current Division guidance for expanding major municipal
dischargers. The more stringent limits are for the protection of the receiving stream
against ammonia toxicity and oxygen consuming waste.
• The inclusion of Section A.(6). for the chronic toxicity permit limitation of 60% at
the expansion flow of 6.5 MGD.
If any parts, measurement frequencies or sampling requirements contained in this permit 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 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, 6714 Mail Service Center, Raleigh, North Carolina 27699-6714. Unless such a demand is
made, this permit shall be final and binding.
North Carolina Division of Water Quality
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
[phone]
FAX [phone]
On the Internet at http://h2o.enr.state.nc.us/

Page 2
Letter to Mr. Spach
Please take notice that this permit is not transferable. The Division may require modification
revocation and reissuance of the permit. This permit does not affect the legal requirements to obtain
other permits which may be required by the Division of Water Quality or permits required by the
Division of Land Resources, Coastal Area Management Act, or any other Federal or Local governmental
permits may be required.
If you have any questions or need additional information, please contact Ms. Jacquelyn Nowell at
telephone number [phone], extension 512.
Sincerely,
ORIGINAL SIGNED BY
SUSAN A. VVILSON
Alan W. Klimek, P.E.
cc: NPDES Unit
Central Files
Winston-Salem Regional Office / Water Quality Section
Dan Blaisdell/ Construction Grants and Loans
Pretreatment Unit
Aquatic Toxicology Unit
DEH
Mr. Roosevelt Childress, EPA Region IV
Alton K. West, P.E./Pease Architects -Engineers 2925 East Independence Blvd.
P.O. Box 18725
Charlotte, N.C. 28205

Permit NC0055786
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 provisions 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 Lexington
is hereby authorized to discharge wastewater from a facility located at the
Lexington WWTP
South of Lexington
Davidson County
to receiving waters designated as Abbotts Creek in 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.
The permit shall become effective November 1, 2004.
This permit and the authorization to discharge shall expire at midnight on April 30, 2009.
Signed this day October 13, 2004.
ORIGINAL SIGNED BY
SUSAN A. WIL$0[N
Alan Klimek, P.E., Director
Division of Water Quality
By Authority of the Environmental Management Commission

Permit NC0055786 4
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby revoked,
and as of this 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 Lexington
is hereby authorized to:
1. Continue to operate the existing 5.5 MGD wastewater treatment facility, consisting of:
• two influent pump stations,
• influent flow measurement and recording,
• mechanical bar screen,
• grit collection,
• two primary clarifiers,
• two trickling filters,
• six aeration basins,
• two secondary clarifiers,
• two polishing lagoons,
• chlorine contact chamber;
2. After receiving an Authorization to Operate from the Division of Water Quality, for 6.5 MGD
3. Discharge treated wastewaters from said facility into Abbotts Creek, a Class WS-V and B water in the
Yadkin -Pee Dee River Basin, at the location specified on the attached map.

Quad: Lexington East, N.C.
Latitude: 35°46'06"
Longitude: 80'14'14"
Stream Class: WS-V & B
Subbasin: 30707
Receiving Stream: Abbotts Creek
NC00 5 5 786
Lexington Regional
WWTP
Facility
Location
North
SCALE 1:24000

Permit NC0055786
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
Beginning on the effective date of this permit and lasting until expansion above 5.5 MGD or the expiration
date, the Permittee shall be authorized to discharge treated wastewater from Outfall 001 subject to the
following effluent limitations and monitoring requirements:
EFFLUENT CHARACTERISTICS
EFFLUENT LIMITATIONS
MONITORING REQUIREMENTS
- -
Monthly .
Average
Weekly
Average
Daily "
Maximum
`Measurement
frequency
Sample
Type
Sample
Location (1)
Flow
5.5 MGD
Continuous
Recording
I or E
BOD, 5-day, 20°C (2) (Apr 1 - Oct 31)
(Nov 1- Mar 31)
5.0 mg/L
10.0 mg/L
7.5 mg/L
15.0 mg/L
Daily
Composite
I, E
Total Suspended Solids (2)
30.0 mg/L
45.0 mg/L
Daily
Composite
I, E
NH3-N, mg/L (Apr 1- Oct 31)
(Nov 1- Mar 31)
2.0 mg/L
4.0 mg/L
6.0 mg/L
12.0 mg/L
Daily
Composite
E
Fecal Coliform (geometric mean)
200/100 mL
400/100 mL
Daily
Grab
E
Dissolved Oxygen
Daily average shall not be less than 6.0 mg/L
Daily
Grab
E
pH
Shall be within the range of
6.0 to 9.0 standard units at all times
Daily
Grab
E
Temperature, °C
Daily
Grab
E
Conductivity, umhos/cm
Daily
Grab
E
Total Residual Chlorine)
28 pg/L
Daily
Grab
E
Total Phosphorus (4) (Apr 1- Oct 31)
(Nov 1- Mar 31)
Monitor (mg/L)
4,910 Ib seasonal total
Monitor (mg/L)
6,930 Ib seasonal total
Weekly
Seasonally
Weekly
Seasonally
Composite
Calculated
Composite
Calculated
E
E
Total Cadmium (pg/L)
2/Month
Composite
E
Total Lead (pg/L)
2/Month
Composite
E
Total Mercury (pg/L)
0.021 pg/L
2/Month
Grab
E
Total Nickel (pg/L)
2/Month
Composite
E
Phenols (pg/L)
3.1 pg/L
2/Month
Grab
E
Total Chromium (pg/L)
Monthly
Composite
E
Total Copper (pg/L)
Monthly
Composite
E
Total Zinc (pg/L)
Monthly
Composite
E
Total Nitrogen (mg/L)
Monthly
Composite
E
Total Silver (pg/L)
Quarterly
Composite
E
Chronic Toxicity
Ceriodaphnia, P/F @ 56% (5)
Quarterly
Composite
E
Pollutant Scan
Annually
Footnote 6
E
here shall be no discharge of floating solids or visible foam in other than trace amounts.
Footnotes:
(1) Sample locations: I - Influent, E - Effluent
(2) The monthly average effluent BOD5 and Total Suspended Solids concentrations shall not exceed 15% of the respective influent values.
(3) The facility is allowed 18 months from the effective date of the permit to comply with the total residual chlorine limit. This time period is
allowed in order for the facility to budget and design/construct the dechlorination or alternative disinfection system.
(4) Effluent limitations for Total Phosphorus shall become effective November 1, 2004. Monitoring requirements shall apply beginning
on the effective date of the permit. Monitoring for total phosphorus shall be conducted and calculated as prescribed above and in
Condition A.(3) of this permit.
(5) Chronic Toxicity (Ceriodaphnia), February, May, August, and November; see Condition A.(5) of this permit.
(6) See condition A. (8.) Effluent Pollutant Scan

Permit NC0055786
A. (2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
Beginning upon expansion above 5.5 MGD and lasting through the expiration date, the Permittee shall be
authorized to discharge treated wastewater from Outfall 001 subject to the following effluent limitations and
monitoring requirements:
EFFLUENT CHARACTERISTICS
EFFLUENT LIMITATIONS
MONITORING REQUIREMENTS
Monthly
Avera9e --
Weekly
Average
Daily:
Maximum :
Measurement
Frequency
S_ ample
Type
Sample
Location (1)
Flow
6.5 MGD
Continuous
Recording
I or E
BOD, 5-day, 20°C (2) (Apr 1- Oct 31)
(Nov 1- Mar 31)
5.0 mg/L
10.0 mg/L
7.5 mg/L
15.0 mg/L
Daily
Composite
I, E
Total Suspended Solids (2)
30.0 mg/L
45.0 mg/L
Daily
Composite
I, E
NH3-N, mg/L (Apr 1 - Oct 31)
(Nov 1- Mar 31)
1.0 mg/L
2.0 mg/L
3.0 mg/L
6.0 mg/L
_
Daily
Composite
E
Fecal Coliform (geometric mean)
200/100 mL
400/100 mL
Daily
Grab
E
Dissolved Oxygen
Daily average shall not be Tess than 6.0 mg/L
Daily
Grab
E
pH
Shall be within the range of
6.0 to 9.0 standard units at all times
Daily
Grab
E
Temperature, °C
Daily
Grab
E
Conductivity, umhos/cm
Daily
Grab
E
Total Residual Chlorinet3l
28 pg/L
Daily
Grab
E
Total Phosphorus (4) (Apr 1- Oct 31)
(Nov 1- Mar 31)
Monitor (mg/L)
4,910 lb seasonal total
Monitor (mg/L)
6,930 lb seasonal total
Weekly
Seasonally
Weekly
Seasonally
Composite
Calculated
Composite
Calculated
E
E
Total Cadmium (pg/L)
2/Month
Composite
E
Total Lead (pg/L)
2/Month
Composite
E
Total Mercury (pg/L)
0.020 pg/L
2/Month
Grab
E
Total Nickel (pg/L)
2/Month
Composite
E
Phenols (pg/L)
2.8 pg/L
2/Month
Grab
E
Total Chromium (pg/L)
Monthly
Composite
E
Total Copper (pg/L)
Monthly
Composite
E
Total Zinc (pg/L)
Monthly
Composite
E
Total Nitrogen (mg/L)
Monthly
Composite
E
Total Silver (pg/L)
Quarterly
Composite
E
Chronic Toxicity
Ceriodaphnia, P/F @ 60% (5)
Quarterly
Composite
E
Pollutant Scan
Annually
Footnote 6
E
There shall be no discharge of floating solids or visible foam in other than trace amounts.
Footnotes:
1. Sample locations: I - Influent, E - Effluent
2. The monthly average effluent BOD; and Total Suspended Solids concentrations shall not exceed 15% of the respective influent
values.
3. The facility is allowed 18 months from the effective date of the permit to comply with the total residual chlorine limit. This time
period is allowed in order for the facility to budget and design/construct the dechlorination or alternative disinfection system.
4. Effluent limitations for Total Phosphorus shall become effective November 1, 2004. Monitoring requirements shall apply
beginning on the effective date of the permit. Monitoring for total phosphorus shall be conducted and calculated as prescribed above
and in Condition A.(3.) of this permit.
5. Chronic Toxicity (Ceriodaphnia), February, May, August, and November; see Condition A.(6) of this permit.
6. See condition A. (8) Effluent Pollutant Scan

Permit NC0055786
SUPPLEMENT TO
EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
A. (3.) INSTREAM MONITORING REQUIREMENTS
(a) Beginning on the effective date of this permit and lasting through the expiration date, the
Permittee shall perform instream sampling upstream and downstream of Outfall 001 as specified
below, unless exempted per paragraph (b) below:
PARAMETERS
SAMPLE TYPE.-
MONITORING FREQUENCY
SAMPLE
LOCATION (1)
Jun 1 - Sep 30
Oct 1 - May 31
Temperature
Vertical at 1 meter
increments
3/week
Weekly
U, D
Dissolved Oxygen
Vertical at 1 meter
increments
3/week
Weekly
U, D
Fecal Coliform
(geometric mean)
Surface
3/week
Weekly
U, D
Conductivity
Vertical at 1 meter
increments
3/week
Weekly
U, D
Total Phosphorus
Depth Integrated
Monthly
Monthly
U, D
Surface
TIN
Integrated
Monthly
Monthly
Monthly
U, D
Surface
NH3-N, as N
Depth Integrated
Monthly
Monthly
U, D
Surface
NO2-N + NO3-N
Depth Integrated
Monthly
Monthly
U, D
Surface
Chlorophyll -a
Depth Integrated
Monthly
Monthly
D
Surface
Footnotes:
(1) Sample locations: U - Upstream at I-85, D - Downstream at Highway 47.
(b) Coordinated Instream Monitoring Program, Yadkin -Pee Dee River Basin Association. The
Permittee shall be provisionally exempted from the instream monitoring requirements specified in
paragraph (a) above, so long as the Permittee remains a party in good standing in an active
instream monitoring Memorandum of Agreement signed with the Division. If the Permittee's
participation in the MOA is terminated, the requirements in paragraph (a) shall be reinstated
immediately and automatically.
(c) Notification of Terminated Membership. If the Permittee's participation in the MOA is
terminated for any reason, the Permittee shall notify the Division in writing within five (5)
working days, unless the termination is initiated by the Division.

Permit NC0055786
A. (4.) TOTAL PHOSPHORUS MONITORING
The Permittee shall calculate the seasonal mass loading of total phosphorus as the sum of monthly loadings,
according to the following equations:
(a) Monthly Mass Loading (lb/mo) = TP x Q x 8.34
where: TP = the average total phosphorus concentration (mg/L) of the
composite samples collected during the month at each outfall
Q = the total volume of wastewater discharged during the month at
each outfall (MG/mo)
8.34 = conversion factor, from (mg/L X MG) to pounds
Seasonal Mass Loading (lb/season) = E (Monthly Mass Loadings) for the season
(b)
The Permittee shall report the total phosphorus concentration for each sample and the monthly mass
loading in the appropriate self -monitoring report and the seasonal mass loading of total phosphorus in the
final self -monitoring report for the season.
A. (5.) 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 56.0%.
The permit holder shall perform at a minimum, quarterly monitoring using test procedures
outlined in the "North Carolina Ceriodapbnia 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: North Carolina Division of Water Quality
Environmental Sciences Branch
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.

Permit NC0055786
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 of flow 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 of "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.
A. (6.) 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 60.0%.
The permit holder shall perform at a minimum, quarterly 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:

Permit NC0055786
Attention: North Carolina Division of Water Quality
Environmental Sciences Branch
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 of flow 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 of "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.
A. (7.) NON -DETECTION REPORTING AND DETERMINATION OF COMPLIANCE
When pursuant to this permit a pollutant analysis is conducted using an approved analytical protocol with
the appropriate minimum detection level and a result of "non -detectable" or "below quantitation limit" is
obtained, the Permittee shall record that result as reported. For the purpose of determining compliance with
a permit limit for the pollutant, the numerical value of that individual analytical result shall be zero.

Permit NC0055786
A. (8.) EFFLUENT POLLUTANT SCAN
The Permittee shall perform an annual Effluent Pollutant Scan for all parameters listed in the attached table (using a
sufficiently sensitive detection level in accordance with 40 CFR Part 136). Samples shall represent seasonal
variations. Unless otherwise indicated, metals shall be analyzed as "total recoverable."
Ammonia (as N) Trans-1,2-dichloroethylene Bis (2-chloroethyl) ether
Chlorine (total residual, TRC) 1,1-dichloroethylene Bis (2-chloroisopropyl) ether
Dissolved oxygen 1,2-dichloropropane Bis (2-ethylhexyl) phthalate
Nitrate/Nitrite 1,3-dichloropropylenc 4-bromophenyl phenyl ether
Kjeldahl nitrogen Ethylbenzene Butyl benzyl phthalate
Oil and grease Methyl bromide 2-chloronaphthalene
Phosphorus Methyl chloride 4-chlorophenyl phenyl ether
Total dissolved solids Methylene chloride Chrysene
Hardness 1,1,2,2-tetrachloroethane Di-n-butyl phthalate
Antimony Tetrachloroethylene Di-n-octyl phthalate
Arsenic Toluene Dibenzo(a,h)anthracene
Beryllium 1 ,1,1 -tric hloroe thane 1,2-dichlorobenzene
Cadmium 1,1,2-trichloroethane 1,3-dichlorobenzene
Chromium Trichloroethylene 1,4-dichlorobenzene
Copper Vinyl chloride 3,3-dichlorobenzidine
Lead Acid-extraetabli compounds; Diethyl phthalate
Mercury P-chloro-m-cresol Dimethyl phthalate
Nickel 2-chlorophenol 2,4-dinitrotoluene
Selenium 2,4-dichlorophenol 2,6-dinitrotoluene
Silver 2,4-dimethylphenol 1,2-diphenylhydrazine
Thallium 4,6-dinitro-o-cresol Fluoranthene
Zinc 2,4-dinitrophenol Fluorene
Cyanide 2-nitrophenol Hexachlorobenzene
Total phenolic compounds 4-nitrophenol Hexachlorobutadiene
Volatile organic compound Pentachlorophenol Hexachlorocyclo-pentadiene
Acrolein Phenol Hexachloroethane
Acrylonitrile 2,4,6-trichlorophenol Indeno(1,2,3-cd)pyrene
Benzene j3are-nextral compoundr:• Isophorone
Bromoform Acenaphthene Naphthalene
Carbon tetrachloride Acenaphthylene Nitrobenzene
Chlorobenzene Anthracene N-nitrosodi-n-propylamine
Chlorodibromomethanc Benzidine N-nitrosodimcthylamine
Chloroethane Benzo(a)anthracene N-nitrosodiphenylamine
2-chloroethylvinyl ether Benzo(a)pyrene Phenanthrcne
Chloroform 3,4 benzofluoranthene Pyrene
Dichlorobromomethane Benzo(ghi)perylene 1,2,4-trichlorobenzene
1,1-dichloroethane Benzo(k)fluoranthene
1,2-dichloroethane Bis (2-chloroethoxy) methane
Test results shall be reported to the Division in DWQ Form- A MR-PPA1 or in a form approved by the
Director within 90 days of sampling. The report shall be submitted to the following address: Division of
Water Quality, Water Quality Section, Central Files, 1617 Mail Service Center, Raleigh, North Carolina
27699-1617.

Fact Sheet - NPDES Permit
City of Lexington
NPDES No. NC0055786
Facility
Receiving Stream
Facility Name:
Lexington WWTP
Receiving Stream:
Abbotts Creek
Permitted Flow (MGD):
5.5
Subbasin:
030707
Requested Expansion
Flow (MGD)::
6.5
Index No.:
12-119-(6)
Facility Class:
IV
Stream Class:
WS-V and B
Facility Status:
Existing
303(d) Listed:
No
Permit Status:
Modification
Use Support:
Impaired
County:
Davidson
Drainage Area (mi2):
182
Regional Office:
Winston-Salem
Summer 7010 (cfs)
6.7
USGS Topo Quad:
D18SW
Winter 7010 (cfs):
15
(Lexington East)
3002 (cfs):
18
Average Flow (cfs):
167
Iwc (%):
56
FACILITY OVERVIEW
The City of Lexington owns and operates a 5.5 MGD, activated sludge wastewater treatment plant
that serves 22,000 people. The current permit was very recently issued in June 18, 2004 after review
and approval by DWQ and EPA Region IV. The facility is currently requesting expansion of its
existing WWTP from 5.5 MGD to 6.5 MGD. The city has performed a hydraulic analysis of the
plant's treatment units and indicates that the plant could handle additional hydraulic loading with
modifications to the existing #2 manhole and influent pumps. Process upgrades proposed for the
6.5 MGD expansion include Biological Nutrient Removal, biosolids dewatering, solids contact
reactor, and a chemical feed (typically alum) system.
Because of the very recent renewal of this permit, the expansion review only: 1) updated the
monthly average and weekly average ammonia limits, 2) inserted the expansion flow of 6.5 MGD
into the 2004 reasonable potential analysis and updated permit limits for mercury and phenols, 3)
updated chronic toxicity limits at the expansion flow of 6.5 MGD.
The previous factsheet submitted with the June 18, 2004 permit is attached.
TOXICITY TESTING
Type of Toxicity Test:
Existing Limit:
Recommended Limit:
Monitoring Schedule:
Quarterly Chronic Ceriodaphnia P/F
Chronic P/F @ 56% at 5.5 MGD
Chronic P/F @ 60% at 6.5 MGD
February, May, August, November
Background consultation on Lexington's previous toxicity problems w/ K. Bowden in Aquatic
Toxicity Unit: Lexington had a problem in the summer of 2003 with meeting the Whole Effluent
Toxicity limit and a civil penalty was assessed. Reasons for the problems were provided in the City's
request for remission of the penalty. The City did a very good job in documenting toxicity problems
and increased their testing frequency above what was required by DWQ. The eight NOVs that

Permit NC0055786
occurred in 2003 were because the City had increased the testing to try to track toxicity reduction
and to meet the AQ TOY policy (for monthly testing after a failure). The 2003 NOVs were 3
occurrences in June, 3 in July, and 2 in August.
Lexington determined that the toxicity problems were caused by elevated flows during that quarter.
Rainfall washed a lot of inert matter into the plant. There were times when the operators turned off
the air to the aeration basin. The suspended solids concentration began to washout and they began
wasting excess mixed liquor. The City is now back in compliance. They have raised several
manholes and gotten rid of the I & I problems. Because the manholes were very low, they had
hydraulic overloading. There are no problems now, and Lexington has been compliant since
November 2003. The plant went through the wet weather season of 2004 without problems. In
2003, DWQ reviewed Cu and Zn effluent data and there was no reasonable potential to exceed
action levels. There were 28 data points and 96% of the values were below detection (27 of 28).
COMPLIANCE HISTORY
Previous problems with toxicity limit violations have been corrected and the facility has been
compliant since November 2003. All tox tests in 2004 have been passed. In 2003 eight Notices of
Violation (NOV) were issued for violating toxicity and BOD limits. In 2002 only one NOV was
issued for violating toxicity limit. In 2001 two NOVs were issued for violating toxicity limit. In 2000
two NOVs were issued for violating toxicity limit .
REASONABLE POTENTIAL ANALYSIS
The following parameters are monitored through the permit issued June 2004: Cd, Pb, Hg, Ni,
Phenols, Cr, Cu, Zn, and Ag. The following parameters are monitored quarterly through the
pretreatment program: As, Cd, Cr, Cu, Pb, Hg, Mo, Ni, Se, Zn, CN. The permit will continue to
require the City to implement its pretreatment program.
)•
PROPOSED CHANGES:
• Limits: Summer Monthly Average NH3-N limit of 1 mg/; Summer Weekly Average NH3-N
Limit of 3 mg/1.
• Limits: Winter Monthly Average NH3-N limit of 2 mg/; Winter Weekly Average NH3-N
Limit of 6 mg/l.
• Limits: Based on the Reasonable Potential Analysis, at the expansion flow of 6.5 MGD,
effluent limits are continued for mercury and phenols.
Existing permit limits and recommended limits/monitoring are summarized in the table below:
Parameter
Existing Limit at
Existing ;
Monitorin
Proposed Limit at
Proposed
Monitoring
5.5 MGD
6.5 MGD (µg/L)
NH3-N
(Summer)
2 mg/1 (Mo. Avg.)
6 mg/1 (Wkly Avg.)
Daily
1 mg/1 (Mo. Avg.)
3 mg/1 (Wkly Avg.)
Daily
NH3-N
(Winter)
4 mg/1 (Mo. Avg.)
12 mg/1 (Wkly Avg.)
Daily
2 mg/1 (Mo. Avg.)
6 mg/1 (Wkly Avg.)
Daily
Mercury
0.021 µg/L
2/Month
0.020 µg/L
2/Month
Phenols
3.1 µg/L
2/Month
2.8 µg/L
2/Month
PROPOSED SCHEDULE FOR PERMIT ISSUANCE:
Draft Permit to Public Notice: July 21, 2004 (est.)
Permit Scheduled to Issue: August 30, 2004 (est.)
2

Permit NC0055786
ANTIDEGRADATION
Lexington has completed an environmental assessment for the WWTP expansion and received and
Finding of No Significant Impact (FONSI) from the State Clearinghouse in May 2003. Engineering
alternatives were analyzed for the environmental assessment and expansion was the preferred
alternative to optimize the current treatment infrastructure.
The Division has determined that the proposed expansion is necessary to accommodate social and
economic growth in the area and that it will not result in contravention of surface water quality or
loss of designated uses in the receiving stream.
STATE CONTACT:
If you have any questions on any of the above information or on the attached permit, please contact
Jackie Noat [phone] ext. 594.
NAME:
RE ' IONAL OFFI E COMMENT:
DATE:
z/1.4
NAME: DATE:
EPA COMMENT:
NAME: DATE:
3

Facility Name =
NPDES # =
Qw (MGD) =
7Q10s (cfs)=
IWC (%) =
Lexington
NC0055786-001
6.5
6.7
60.06
FINAL RESULTS
Mercury
Max. Pred Cw
Allowable Cw
0.035
0.020
RESULTS
Std Dev.
Mean
C.V.
Number
of data points
Mult Factor =
Max. Value
Max. Pred Cw
Allowable Cw
0.0035
0.005
0.7280
16
r 2.935
0.012 pg/1
0.035 µg/1
0.020 µg/1
Parameter =
Standard =
Mercury
0.012
Date n < Actual Data BDL=1/2DL
1 0.01160 0.01160
2 0.00377 0.00377
3 0.00339 0.00339
4 0.00242 0.00242
5 0.00976 0.00976
6 0.00313 0.00313
7 < 0.00100 0.00050
8 0.00190 0.00190
9 0.00416 0.00416
10 0.00382 0.00382
11 0.00247 0.00247
12 0.00434 0.00434
13 0.01190 0.01190
14 0.00288 0.00288
15 0.00834 0.00834
16 0.00302 0.00302
µg/1

Facility Name =
NPDES # =
Qw (MGD) =
7Q10s (cfs)=
IWC (%) =
Lexington
NC0055786-001
6.5
18
35.89
FINAL RESULTS
Phenol
Max. Pred Cw
Allowable Cw
22.3
2.8
RESULTS
Std Dev.
Mean
C.V.
Number
of data points
Mult Factor =
Max. Value
Max. Pred Cw
Allowable Cw
1.7508
1.8
1.0004
24
3.19
7.0 pg/1
22.3 pg/1
2.8 µg/1
Parameter =
Standard =
Phenol
1.0
Date n < Actual Data BDL=1/2DL
1 < 2.00 1.00
2 2.00 2.00
3 < 2.00 1.00
4 < 2.00 1.00
5 < 2.00 1.00
6 < 2.00 1.00
7 < 2.00 1.00
8 2.00 2.00
9 < 2.00 1.00
10 < 2.00 1.00
11 < 2.00 1.00
12 < 2.00 1.00
13 < 2.00 1.00
14 < 2.00 1.00
15 < 2.00 1.00
16 2.00 2.00
17 < 2.00 1.00
18 4.00 4.00
19 < 2.00 1.00
20 < 2.00 1.00
21 7.00 7.00
22 7.00 7.00
23 < 2.00 1.00
24 < 2.00 1.00
nil

Facility Name =
NPDES # =
Qw (MGD) =
7Q10s (cfs)=
1WC (%) =
Lexington
NC0055786-001
6.5
6.7
60.06
FINAL RESULTS
Cadmium
Max. Pred Cw
Allowable Cw
1.0
3.3
RESULTS
Std Dev.
Mean
C.V.
Number
of data points
Mult Factor =
Max. Value
Max. Pred Cw
Allowable Cw
0.0000
1.0
0.0000
14
1.00
1.0 µg/1
1.0 µg/1
3.3 µg/1
Parameter =
Standard =
Cadmium
2.0
Date n < Actual Data BDL=1/2DL
1 < 2.0 1.00
2 < 2.0 1.00
3 < 2.0 1.00
4 < 2.0 1.00
5 < 2.0 1.00
6 < 2.0 1.00
7 < 2.0 1.00
8 < 2.0 1.00
9 < 2.0 1.00
10 < 2.0 1.00
11 < 2.0 1.00
12 < 2.0 1.00
13 < 2.0 1.00
14 < 2.0 1.00
µg/1

Facility Name =
NPDES # =
Qw (MGD) =
7Q10s (cfs)=
IWC (%) =
Lexington
NC0055786-001
6.5
6.7
60.06
FINAL RESULTS
Silver
Max. Pred Cw
Allowable Cw
2.50
0.10
RESULTS
Std Dev.
Mean
C.V.
Number
of data points
Mult Factor =
Max. Value
Max. Pred Cw
Allowable Cw
0.0000
2.5
0.0000
12
1.00
2.50 pg/1
2.50 pg/1
0.10 pg/1
Parameter =
Standard =
Silver
0.06
Date n < Actual Data BDL=1/2DL
2
3
4
5
6
7
8
9
10
11
12
5
5
5
5
5
5
5
5
5
5
5
5
2.50
2.50
2.50
2.50
2.50
2.50
2.50
2.50
2.50
2.50
2.50
2.50

Facility Name =
NPDES # =
Qw (MGD) =
7Q10s (cfs)=
IWC (%) _
Lexington
NC0055786-001
6.5
6.7
60.06
FINAL RESULTS
Zinc
Max. Pred Cw
Allowable Cw
Allowable #/day
65.7
83.3
0.0
RESULTS
Std Dev.
Mean
C.V.
Number
of data points
Mult Factor =
Max. Value
Max. Pred Cw
Allowable Cw
r
7.0698
28.7
0.2467
21
1.43
45.9 pg/1
65.7 µg/1
83.3 µg/1
Parameter =
Standard =
Zinc
50.0
Date n < Actual Data BDL=1/2DL
1
2
3
4
5
6
7
8
9
10
11 <
12 <
13
14
15 <
16 <
17 <
18 <
19
20 <
41.6 41.6
32.7 32.7
45.9 45.9
38.3 38.3
43.2 43.2
50 25.0
50 25.0
50 25.0
50 25.0
50 25.0
50 25.0
50 25.0
50 25.0
50 25.0
50 25.0
50 25.0
50 25.0
50 25.0
50 25.0
50 25.0
21 < 50.0 25.0
ugil

[Fwd: Draft NPDES Permits]
Subject: [Fwd: Draft NPDES Permits]
From: Lee Spencer <[e-mail]>
Date: Fri, 17 Sep 2004 10:09:49 -0400
To: Jackie Nowell <[e-mail]>
Is this the NPDES permit you called about? Did you receive this previous e-mail? Are
Jacquelyn and Jackie the same person?
Original Message
Subject:Draft NPDES Permits
Date:Wed, 11 Aug 2004 14:48:39 -0400
From:Lee Spencer <[e-mail]>
Organization:NC DENR Public Water Supply
To: [e-mail], [e-mail]
CC:Dave Goodrich <[e-mail]>, lorna withrow
<lorna.withrow @ ncmail.net>
I recently received draft permits from each of you. I assume you would
like an okay from our office before issuing the final permit. Normally,
the DWQ reviewer sends a cover "check -off sheet" on which I provide any
comments and sign. This form was not on either package.
I have no objection to the issuance of either of these two permits:
City of Lexington WWTP NC0055786
Town of Denton WWTP NC0026689
Lee G. Spencer, P.E.
Regional Engineer
Winston-Salem Regional Office
Public Water Supply Section
N.C. Dept. of Environment and Natural Resources
Voice: 336-771-4608 ext 374
Lee G. Spencer, P.E.
Regional Engineer
Public Water Supply Section
NC DENR Winston-Salem Regional Office
1 of 2 9/21/2004 4:27 PM

. 09-10-'04 15:00 FROM -Div of Water Quality 3367714630
uwu Nuitn JUUKI t aeu iu 4uu4
T-031 P002/002 U-080
F U. J`F r. i J
Permit NCOO55786
ANTI 4 1O
environmental assessment for the WWT' expansion and received
an
d
Lexington has complet d an from the State Clearinghouse in May 2003. Engw. etin,
Finding of No Signifxc t Impact (FONS1)
alternatives were analy z d for the environmental assessment and expansion was the preferred
alternative to optimize e dent treatment infrastructure.
d that theproposed expansion is necessary to accommodate social and
d
The Division has deter jn�ne P P
e area and that it will not result in cons tavention of surface water quality
economic growth in �
loss of designated uses in the receiving stream.
If you have any questi
Jackie No at (919)
NAME:
NAME:
FpA G
ns on any of the above information or on the attached permit, please contact
733-5038 ext. 594.
ATE:
E T:
((//`( 6/4) bv/ 7/r/
•
ATE:-11/��`

Jc(ED ST4i,
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY
AYzw REGION 4
o Q ATLANTA FEDERAL CENTER
Zy�4'61 FORSYTH STREET
1 PRO" ATLANTA, GEORGIA 30303-8960
—ci 0 4 2004
Ms. Jackie Nowell
North Carolina Department of Environment and
Natural Resources
Division of Water Quality
NPDES Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
SUBJ: Draft Modified NPDES Permit
Lexington Regional WWTP - Permit No. NC0055786
Dear Ms. Nowell:
In accordance with the EPA/NCDENR NPDES MOA, we have completed review of the draft
modified permit specified above and we have no comments or objections to its conditions. We request
that we be afforded an additional review opportunity only if significant changes are made to the draft
modified permit prior to issuance or if significant comments objecting to it are received. Otherwise,
please send us one copy of the final permit when issued.
If you have any questions, please call me at [phone].
Sincerely,
Marshall Hyatt, Environmental Scientist
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 (Minimum 30% Postconsumer)

August 16, 2004
Honorable Richard L. Thomas, Mayor
and City Council Members
City of Lexington
28 West Center Street
Lexington, NC 27292
Dear Mayor Thomas and Council Members,
c 0Ss781,
Fe. ,ter
."' ' -.•" :•••+�I a Ifla+nw�w+x:..:+wrw rr.w.•aw ...wet,
DENR — WATER =CuA? irr
POINT SOURCE BRANCH
'.xx g-• --4 - . :.r_ _ .- ,:ode; ..
The Lexington Area Chamber of Commerce recognizes the need and desire in our
community to have the highest quality water resources available to our citizens. It further
recognizes the City of Lexington's desire to further the goals of the Yadkin -Pee Dee
River Basinwide Water Quality Plan, as adopted in 2003, through the efficient and
maximized operation of its Regional Wastewater Treatment Plant and its efforts to
remove waters in the county from the impaired waters list.
The Board of Directors of the Lexington Area Chamber of Commerce is pleased to
extend its support of the City's application to modify its NPDES Permit #NC0055786 to
increase the capacity of its Regional Wastewater Treatment Plant by 1.0 million gallons
per day. In addition, the Lexington Area Chamber of Commerce supports the partnership
between the City of Lexington and Davidson County to provide adequate wastewater
treatment at several of the County Schools outside of the city limits and to meet the needs
of anticipated growth as adopted in its recent "201" Planning document.
Sincerely,
Mike Turlington
Board Chairman
Radford L. Thomas
President/CEO
•
♦

THE CITY OF
NORTH
28 WEST CENTER STREET
LEXINGTON, NC 27292
July 21, 2004
LEXINGTON
CAROLINA
"SERVING THE COMMUNITY SINCE 1828"
Ms. Jackie Nowell
Division of Water Quality
1617 Mail Service Center
Raleigh, N.C. 27699-1617
Re:
Subject:
City of Lexington
Regional WWTP NC0055786
Davidson County
TELEPHONE [phone]
kr WATER QUALITY
I ,SOURCE BRANCH
Resolutions of Support For Lexington's Request for a Modification of its
Wastewater Treatment Plant
Dear Ms. Nowell:
I am forwarding resolutions of support of Lexington's request for modification of the NPDES
Permit for its Regional Wastewater Treatment Plant (NC0055786). These were adopted by the
Lexington City Council and the Davidson County Commissions respectively.
Thank you for your consideration of this matter.
Sincerely,
Roger Spach
RS/kb
Attachment:
cc: Rick Austin

RESOLUTION NO. 42-04
In Support of the City of Lexington's
Permit Modification Application
For the Wastewater Treatment Plant
National Pollutant Discharge Elimination System
(NPDES) Permit Number NC0055786
WHEREAS, the City Council of the City of Lexington, North Carolina, desires to further
the goals of the Yadkin -Pee Dee River Basinwide Water Quality Plan as adopted in 2003;
and
WHEREAS, the City of Lexington wishes to work with the Davidson County
Government and the State of North Carolina to remove waters in the county from the
impaired waters list; and
WHEREAS, the City of Lexington realizes that its Regional Wastewater Treatment Plant
is considered to be a "Regional Wastewater Treatment Plant" and that no other NPDES
Permits will be issued in the Davidson County; and
WHEREAS, the City of Lexington desires to provide for adequate wastewater treatment
at several of the County Schools located outside its City limits and provide for adequate
wastewater treatment for anticipated growth as adopted in its recent "201" Planning
document; and
WHEREAS, Davidson County has requested 1.2 million gallons per day of wastewater
treatment capacity in the City of Lexington's Regional Wastewater Treatment Plant to
provide adequate treatment for the wastewater generated by certain of its schools and
anticipated growth adjacent to the City of Lexington;
NOW, THEREFORE, BE IT RESOLVED, that the City Council of the City of
Lexington does hereby request the North Carolina Department of Environment and
Natural Resources to approve the application to modify NPDES Permit #NC0055786 to
increase the capacity of Lexington's Regional Wastewater. Treatment Plant by one
million gallons per day.
ADOPTED this the 28th day of June, 2004. "
Richard L. Thomas, Mayor
Lanier, C C City Clerk
S.

Davidson County Resolution
In Support of the City of Lexington's NPDES Permit Modification Application
NPDES Permit Number NC0055786
VVhereas, the Davidson County Board of Commissioners desires to further the goals of
the Yadkin -Pee Dee River Basinwide Water Quality Plan as adopted in 2003.
VVhereas, Davidson County wishes to work with the City of Lexington and the State of
North Carolina to remove waters in the county from the impaired waters list.
Whereas, Davidson County realizes that the City Of Lexington's Regional Wastewater
Treatment Plant is considered to be a "Regional Wastewater Treatment Plant" and that
efforts should be made to work with the City of Lexington to help meet Davidson
County's wastewater treatment needs.
Whereas, Davidson County desires to provide for adequate wastewater treatment at
several of its schools and provide for adequate wastewater treatment for anticipated
growth as adopted in its recent "201" Planning document.
Whereas, Davidson County has requested 1.2 million gallons per day of wastewater
treatment capacity in the City of Lexington's Regional Wastewater Treatment Plant to
provide adequate treatment for the wastewater generated by certain of its schools and
anticipated growth adjacent to the City of Lexington.
Now Therefore, Be It Resolved by The Davidson County Board of Commissioners that
it supports the application made by the City of Lexington to Modify its NPDES Permit
#NC0055786 to increase the capacity of its Regional Waste Water Treatment Plant by
1.0 million gallons per day.
Adopted this thea2 day of June, 2004
Davidson County
Board of Commissioners
Fred C. Sink
Chairman
Attest:
04.1- e, Nehze/fi
Robert C. Hedrick
Clerk to the Davidson County
Board of Commissioners

NORTH CAROLINA
FORSYTH COUNTY
AFFIDAVIT OF PUBLICATION
Before the undersigned, a Notary Public of said County and State, duly
commissioned, qualified, and authorized by law to administer oaths, personally
appeared D.H. Stanfield, who being duly sworn, deposes and says: that he is
Controller of the Winston-Salem Journal, engaged in the publishing of a newspaper
known as Winston-Salem Journal, published, issued and entered as second class mail
in the City of Winston-Salem, in said County and State: that he is authorized to
make this affidavit and sworn statement: that the notice or other legal advertisement,
a true copy of which is attached hereto, was published in Winston-Salem Journal on
the following dates:
July 24, 2004
and that the said newspaper in which such notice, paper document, or legal
advertisement was published was, at the time of each and every such publication, a
newspaper meeting all the requirements and qualifications of Section 1-597 of the
General Statues of North Carolina and was a qualified newspaper within the meaning
of Section 1-597 of the general statues of North Carolina.
This 26th day of July, 2004 O
(signature offpers,
making affidavit)
Sworn to and subscribed before me, this 26th day of Jy13 004
My Commission expires: September 23, 2005
OFFICIAL SEAL
Notary Public, North Carolina
COUNTY OF FORSYTH
KIMALEY/lpHNON
My Commission Expires '7'li') ,t
PUBLIC NOTICE
STATE OF NORTH CAROUNA
ENVIRONMENTAL MANAGEMENT COMMISSION/NPDES UNIT
1617 MAIL SERVICE CENTER
RALEIGH, NC 27699.1017
NOTIFICATION OF INTENT TO ISSUE
A NPDES WASTEWATER PERMIT
On the basis of thorough staff review and application of NC General Stat-
ute 143.21, Public law 92.500 and other lawful standards and regula-
tions, the North Carolina Environmental Management Commission pro
poses to issue a National Pollutant Discharge Elimination System
(NPDES) wastewater discharge permit to the person(s) fisted below ef-
fective 45 days from the publish date of this notice.
Written comments regarding the proposed permit wilt be accepted until
30 days after the publish date of this notice. All comments received prior
to that date are considered in the firm determinations regarding the pro-
posed permit. The Director of the NC Division of Water Quality may de-
adeto hold a pubic meeting for the proposed permit should the Division
recehe a significant degree of public interest.
Copies of the draft permit and other supporting information on file used
to determine conditions present in the draft permit are available upon re-
quest and payment of the costs of reproduction. Mail comments and/or
requests for information to the NC Division of Water Duality at the above
address or call Ms. Carolyn Bryant at [phone], extension 520.
Please include the NPDES permit number (attached) in any communica-
tion. Interested persons may also visit the Division of Water Duality at
512 N. Salisbury Street, Raleigh, NC 27604-1146 between the hours of
8:00 a.m. and 5:00 p.m. to review information on file.
The Ctty of Lexington (28 West Center Street, Lexington, NC 27292)
has applied for expansion and modification of NPDES permit
N00055766 for the Lexington Regional WWTP in Davidson County. This
permitted facility discharges treated wastewater to Abbotts Creek in the
Yadkin Pee -Dee River Basin. Currently BOD, ammonia nitrogen, iolat
phosphorus, mercury, phenols and total residual chlorine are water
quality limited. This discharge may affect future allocations in this portion
of the Yadkin Pee -Dee River Basin.
The Town o1 Denton (P.O. Box 306, Denton, NC 27239) has aFplied for
renewal of NPDES permit NC0026689 for the Denton WATP in Javidson
County. This permitted Iacdify discharges 0.8 MGD of treated wastewa-
ter to Lick Creek in the Yadkin -Pee Dee River Basin. Currently BOD, am-
monia nitrogen, total nickel and total residual chlorine are water quality
limited. This discharge may affect future allocations in this portion of the
Yadkin -Pee Dee River Basin.
WSJ: July 24, 2004

'5 Arifr
67< itc_ /4,6
en./4.c ois.1 / a/4//�,,�
777
- j7
4/(% Crdt✓h
6/4/7
a41 7,;„6
s��.Pf

Lexington WWTP expansion
Residual Chlorine
7Q10 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (UG/L)
UPS BACKGROUND LEVEL (1
IWC (%)
Allowable Concentration (ugi
Fecal Limit
Ratio of 0.7 :1
6.7
6.5
10.075
17.0
0
60.06
28.31
Ammonia as NH3
(summer)
7Q10 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (MG/L)
UPS BACKGROUND LEVEL
IWC (%)
Allowable Concentration (m
Ammonia as NH3
(winter)
7Q10 (CFS)
200/100mI DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (MG/L)
UPS BACKGROUND LEVEL
IWC (%)
Allowable Concentration (m
6.7
6.5
10.075
1.0
0.22
60.06
1.52
15
6.5
10.075
1.8
0.22
40.18
4.15
6/11/2004

Whole Effluent Toxicity Testing Self -Monitoring Summary
FACILITY REQUIREMENT
July 15, 2004
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Kinston -Peachtree WWTP chr lim: 90%
NC0020541/001 Begin:12/1/2003 Frequency Q Fcb May Aug Nov
County: Lenoir Region: WARO Subbasin: NEU05
PF: 6.75 Special
7Q10: 0 IWC(%) 100 Order.
+ NonComp:Single
2000 - Pass
2001 - Pass
2002 -- Pass
2003 - Pass
2004 - Pass
Pass
Pass
Pau
Pass
Pass
Pass
Pass
Pass
Pass
Pass
Pass
Pass
Pass
Kobe Copper Products, Inc. chr lim: 34%
NC0035173/001 Begin3/12002 Frequency Q Jan Apr Jul Oct
County: Stokes Region: WSRO Subbasin: ROAOI
PF: 0.025 Special
7Q 10: 0.075 IWC(%) 34.05 Omer:
+ NonComp:Single
2000 Pau - - Pass
2001 Fall >68 >88 Pau
2002 Pau - - Pau
2003 Pau - - Pau
2004 Fall <17 <17 Pau
- - Pau - - Pau
- - Pau - - Pass
- - Pau - - Pass
- - Pau - - Pass
Lake Waccamaw WWTP chr lim: 90% 2000 -- - Pass - Pass - Pass - - Pass
NC0021881/00I Begin:7/I2000 Frequency: Q Mar Jun Sep Dec + NonComp:Single 2001 -- - Pass - - Pass - - Pass - - Pass
County: Columbus Region: WIRO Subbasin: LUM56 2002 - - Pass - - Pass - - Pass - - NR/Fall
PF:0.4 Special 2003 >100 82.18 Pau - - Pau - - Pau - - Pau
7Q10: 0.0 IWC(%) 100 Order: 2004 - - Pass - - Pau
Laurinburg Maxton Airport -Laurel 11111 chr lim: 1.5%
NC0005479/001 Begin 12/1/1999 Frequency: Q P/F Mar Jun Sep Dec
County: Scotland Region: FRO Subbasin: LUM55
PF: 0.3 Special
7Q10: 31.0 IWC(%) 1.5 order:
+ NonComp:Single
t} 2000 - - Pass - - Pass - - Pass - - Pass
2001 - - Pau - - Pass - - Pass - - Pass
2002 -- - Pass - - Pass - - Pass - --- Pass
2003 -- --- Pass - - Pass - Pass - Pass
2004 -- Pass - -
Laurinburg WWTP chr lim: 31% 2000 - >60 - - Pass - - Invalid Pass - Pass
NC0020656/001 Begin 3/1/2001 Frequency: Q Feb May Aug Nov + NonComp:Single 2001 - Pass - - Pass - - Pass - - Pass
County: Scotland Region: FRO Subbasin: LUM55 2002 - Pass - - Pass - - Pass - - Pass
PF: 4.0 Special 2003 - Pass - - Pass - - Pau - - Pass
7Q10: 13.8 IWC(%) 31 Ord. 2004 - Pass.>82 >82 - Pau
Laurinburg-Maxton Airport chr lim: 1.3%; if pf 2MGD chr lim 2.6% ¥ 2000 - - Pass - - Pass - - Pass - - Pass
NC0044725/001 Bcgin.3/1/2000 Frequency: Q Mar Jun Sep Dec + NonComp:Single 2001 - -- Fall 1.84 3.68 Pass - Pass - Pass
County: Scotland Region: FRO Subbasin: LUMS 1 2002 - - Pass - - Pass - Pass - Pass
PF: 1.0 Special 2003 - - Pass - - Pau - - Pass - - Pau>5.1
7Q10: 111.0 IWC(%) 1.38 Order: 2004 1.84 - Pass,>5.2 - -
LCP Plastics, Inc. fathead 24h LC50 ac epis disc 2000 - H - - H
NC0036366/001 Begin 3/12003 Frequency: Q P/F + Feb May Aug Nov NonComp:Single 2001 - H - - H
County: Guilford Region: WSRO Subbasin: CPF08 2002 - H - - H
PF: NA Special 2003 - H - H
7Q10: 0.00 IIVC(%)100 Order: 2004 -- H H
H - - H
H - - H
H - H
H - H
Lenoir- Gunpowder Creek WWTP chr lim: 52%
NC0023736/001 Begin I/12001 Frequency Q Mar Jun Sep Dec + NonComp:Single
County: Caldwell Region: ARO Subbasin: CTB32
PF: 2.0 Special
7Q10: 3.0 IWC(%) 52.0 Order.
2000 - Pass Pau - - Pass - - Pass - - Pau
2001 - - Pass - - Pass - Pass - - -
2002 - - pass - - Pass - - Pass - - Pau
2003 - - pass - - Pass - - Pau - - Pass
2004 -- >100 Pau.>100 - -
Lenoir- Lower Creek WWTP chr lim: 44% 2000 - Pass - Pass
NC0023981/001 Begin:6/12001 Frequency: Q Feb May Aug Nov + NonComp:Singlc 2001 - Pass - tato
County: Caldwell Region: ARO Subbasin: CTB3 1 2002 - Pass Pass
PF: 6.0 Special 2003 - Pau - - Pass
7Q10: 11.75 IWC(%)44 Order. 2004 - Pass,>100 >100 - Pass
Pass
- Pass - Pass
- Pass - - Pass
Pass - Pass
- Pass - - Pass
Lexington Regional WWTP CHR LIM: 56% K 2000 - Pass - - Pass - - Fas,>90 39.6 >90,Passt Pass
NC0055786/001 Begin 3/1/2002 Frequency Q Feb May Aug Nov + NonComp:SINGLE 2001 - Pass - - Fail >90(419.0 64.8(s) Pass - - Pau
County: Davidson Region: WSRO Subbasin: YADO7 2002 - Pass - Pass - -- Fas >90 >90 Pau -
PF: 5.5 special
2003 - Pass -- - Fait 19.8,39.6t >90,39.6t Pass,39.8t 82.2 >90 Fail,>90 >90
7Q10: 6.7 1WC(%) 56 Ordcr: 2004 >90 >90,Pass >90 - Pass
Libbcy-Owens Ford Co. 24 hr p/f ac lim: 90% lthd
NC0049514/001 Begin 12/1/1999 Frequency: Q P/F + Jan Apr Jul Oct
County: Scotland Region: FRO Subbasin: LUM55
PF: VAR Special
7Q10: 0.0 IWC(%) 100 Oder
+ NonComp:Singlc
2000 Late
2001 Pass
2002 H
2003 Pass
2004 Pass
Pass
Pass
Pass
Pass
Pass
Pau
Pass
H
Pass
Pass
Pass
H
Pass
Pau
Lincolntoo WWTP chr lim: I I%
NC0025496/001 Begin. 11/1/2002 Frequency: Q Mar Jun Sep Dec
County: Lincoln Region: MRO Subbasin: CTB35
PF: 6.0 Special
7Q10: 77.0 1WC(%) 11.0 order:
+ NonComp: Single
2000 - - Pass - - Pass - - Pass - - NR/Pass
2001 -- - Pass - - Fail >30 14.8 Fall 24.5 24.5 14.8
2002 -- - 29.7 - - >33 -- - Pass - - Pass
2003 - - Pass - - Pass - - Pass - - Pass
2004 - - Pass,>40 >40 -
8 Pre 2000 Data Available
LEGEND:
PERM = Permit Requirement LET = Administrative Letter - Target Frequency = Monitoring frequency: Q- Quarterly; M- Monthly; BM- Bimonthly; SA- Semiannually; A- Annually; OWD- Only when discharging; D- Discontinued monitoring requirement
Begin = First month required 7Q10 = Receiving stream low flow criterion (cfs) + = quarterly monitoring increases to monthly upon failure or NR Months that testing must occur - ex. Jan, Apr, Jul, Oct NonComp = Current Compliance Requirement
PF = Permitted flow (MGD) IWC% = Inslream waste concentration P/F = Pass/Fail test AC = Acute CHR = Chronic
Data Notation: I- Fathead Minnow; • - Ceriodaphnia sp.; my - Mysid shrimp; ChV - Chronic value; P - Morality of stated percentage at highest concentration; at - Performed by DWQ Aquatic Tox Unit; bt - Bad test
Reporting Notation: -- = Data not required; NR - Not reported Facility Activity Status: I - Inactive, N - Newly Issued(To construct); H - Active but not discharging; t-More data available for month in question; ❑ = ORC signature needed
25

THE CITY OF
NORTH
LEXINGTON
CAROLINA
"SERVING THE COMMUNITY SINCE 1828"
28 WEST CENTER STREET TELEPHONE [phone]
LEXINGTON, NC 27292
March 15, 2004
N.C. DENR/DWQ
Att: NPDES Unit
1617 Mail Service Center
Raleigh, N.C. 27699-1617
Re:
City of Lexington
Davidson County
Lexington Regional WWTP
Permit #NC0055786
Subject: Permit Modification Application
Dear Sirs:
I am submitting one original and three copies of the attached application for modification
of Lexington's NPDES Permit #NC0055786. Also, attached is a check for $860 to cover
this application for a major permit modification.
The city is requesting that the permitted flow be increased from 5.5 to 6.5 MGD. We
anticipate that there will be no increase in the present discharge limits for BOD and Total
Phosphorous.
In 2002, the city retained the services of J.N. Pease Associates to perform a hydraulic
analysis of the plant's treatment units (see attached). The analyses showed that the plant
could handle the additional hydraulic loading with modifications to the existing #2
manhole and influent pumps. Present construction of BNR facilities at the plant will
bypass the #2 manhole. In the heavy rainfall events last year, we were able to sustain
influent flows in excess of 14 MGD with the existing pumps while having our largest
influent pump out of service. We have however, retained impellors for the influent
submersible pumps rated to handle the proposed maximum flows.
It is our understanding that two requests for speculative limits have been submitted; one
from our consultant and one from HDR on behalf of Davidson County. Davidson County
and HDR are in the process of withdrawing their requests.

r .1.._ 1
If I can answer any questions regarding this, please contact me at 336-248-3970 or at
[e-mail].
Sincerely,
PoTJ
Roger Spach
Cc: Rick Austin
Robert Hyatt
Steve Mauney

FACILITY NAME AND PERMIT NUMBER:
Lexington Regional WWTP, NC0055786
PERMIT ACTION REQUESTED:
modification
RIVER BASIN:
Yadkin Pee -Dee
SUPPLEMENTAL APPLICATION INFORMATION
PART F.INDUSTRIAL USER DISCHARGES AND RCRA/CERCLA WASTES
All treatment works receiving discharges
complete part F.
GENERAL INFORMATION:
from significant industrial users or which receive RCRA,CERCLA, or other remedial wastes must
works have, or is subject ot, an approved pretreatment program?
(SIUs) and Categorical Industrial Users (CIUs). Provide the number
treatment works.
1
of each of the following types of
questions F.3 through F.8 and
F.1. Pretreatment program. Does the treatment
X Yes ❑ No
F.2. Number of Significant Industrial Users
industrial users that discharge to the
a. Number of non -categorical SIUs.
b. Number of CIUs.
SIGNIFICANT INDUSTRIAL USER
2
INFORMATION:
to the treatment works, copy
Supply the following information for each SIU. If more than one SIU discharges
provide the information requested for each SIU.
F.3. Significant Industrial User Information. Provide the name and address of each SIU discharging to the treatment works. Submit additional pages
as necessary.
Name: Cardinal Container Service
Mailing Address: 138 Walser Road
Lexington, NC 27295
F.4. Industrial Processes. Describe all the industrial processes that affect or contribute to the SIU's discharge.
Drum reconditioner and cleaner
F.5. Principal Product(s) and Raw Material(s). Describe all of the principal processes and raw materials that affect or contribute to the SIU's
discharge.
Principal product(s):reconditioned plastic drums and intermediate bulk containers; recycled plastic, fiberglass, and steeIRCRA empty containers
Raw material(s): above
F.6. Flow Rate.
a. Process wastewater flow rate. Indicate the average daily volume of process wastewater discharge into
day (gpd) and whether the discharge is continuous or intermittent.
35.000 gpd ( continuous or X intermittent)
the collection system ih gallons per
discharged into the collection system
b. Non -process wastewater flow rate. Indicate the average daily volume of non -process wastewater flow
in gallons per day (gpd) and whether the discharge is continuous or intermittent.
1500 gpd ( continuous or X intermittent)
F.7. Pretreatment Standards. Indicate whether the SIU is subject to the following:
a. Local limits X Yes 0 No
b. Categorical pretreatment standards 0 Yes 0 No
If subject to categorical pretreatment standards, which category and subcategory?
EPA Form 3510-2A (Rev. 1-99). Replaces EPA forms 7550-6 & 7550-22.
Page 19 of 22

FACILITY NAME AND PERMIT NUMBER:
Lexington Regional VVVVfP, NC0055786
PERMIT ACTION REQUESTED:
modification
RIVER BASIN:
F.8. Problems at the Treatment Works Attributed to Waste Discharge by the SIU. Has the SIU caused or contributed to any problems (e.g.,
upsets, interference) at the treatment works in the past three years?
❑ Yes X No If yes, describe each episode.
RCRA HAZARDOUS WASTE RECEIVED BY TRUCK, RAIL, OR DEDICATED PIPELINE:
F.9. RCRA Waste. Does the treatment works receive or has it in the past three years received RCRA hazardous waste by truck, rail or dedicated pipe?
❑ Yes X No (go to F.12)
F.10. Waste transport. Method by which RCRA waste is received (check all that apply):
❑ Truck 0 Rail 0 Dedicated Pipe
F.11. Waste Description. Give EPA hazardous waste number and amount (volume or mass, specify units).
EPA Hazardous Waste Number Amount Units
CERCLA (SUPERFUND) WASTEWATER, RCRA REMEDIATION/CORRECTIVE ACTION
WASTEWATER, AND OTHER REMEDIAL ACTIVITY WASTEWATER:
F.12. Remediation Waste. Does the treatment works currently (or has it been notified that it will) receive waste from remedial activities?
Yes (complete F.13 through F.15.) 0 No
F.13. Waste Origin. Describe the site and type of facility at which the CERCLA/RCRA/or other remedial waste originates (or is excepted to origniate in
the next five years).
F.14. Pollutants. List the hazardous constituents that are received (or are expected to be received). Include data on volume and concentration, if
known. (Attach additional sheets if necessary.)
F.15. Waste Treatment.
a. Is this waste treated (or will be treated) prior to entering the treatment works?
Yes ❑ No
If yes, describe the treatment (provide information about the removal efficiency):
b. Is the discharge (or will the discharge be) continuous or intermittent?
Continuous ❑ Intermittent If intermittent, describe discharge schedule.
END OF PART F.
REFER TO THE APPLICATION OVERVIEW (PAGE 1) TO DETERMINE WHICH OTHER PARTS
OF FORM 2A YOU MUST COMPLETE
EPA Form 3510-2A (Rev. 1-99). Replaces EPA forms 7550-6 & 7550-22.
Page 20 of 22

Roger Spach
From: Mosteller, Kevin [[e-mail]]
Sent: Tuesday, March 09, 2004 9:25 AM
To: [e-mail]; Roger Spach
Subject: Davidson County - Speculative Limits Request
Sergei -
My name is Kevin Mosteller and I work for HDR Engineering. Over the past couple of years,
HDR has been the consulting engineer to Davidson County in a wastewater master plan
project that was closely coordinated with the City of Lexington. During the development
of that project, we submitted a couple of letters to your organization requesting
speculative limits for an expanded City of Lexington WWTP, and a couple of proposed new
Davidson County WWTPs. Due to low staff levels and high backlog of work at DENR, those
speculative limits request were never acted upon. Davidson County and the City of
Lexington completed their wastewater master plan project and now have an agreement for
future wastewater service. Thus, the speculative limits requests that were submitted are
no longer needed.
I learned last week that these letters, from two years ago now, are potentially 'holding
up' some efforts that the City of Lexington has underway. We would like to officially
withdraw the previous request for speculative limits that were submitted, thereby 'freeing
up' your efforts to work with the City of Lexington.
If you have any questions or would like additional information - please email or call me
at 704-338-6802.
Thanks
Kevin Mosteller
1