NC0055786_Permit (Issuance)_20020130

NPDES DOCUMENT SCANNING 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:
January 30, 2002
This document is pririted on reuse paper - igrnore any
content on the resrerse side

State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
Michael F. Easley, Governor
William G. Ross, Jr., Secretary
Gregory J. Thorpe, Ph.D., Acting Director
January 30, 2002
Mr. R. Duke Whisenant
City of Lexington
28 West Center Street
Lexington, North Carolina 27292
ATA
NCDENR
Subject: NPDES Permit Issuance
Permit NC0055786
Lexington WWTP
Davidson County
Dear Mr. Whisenant:
In accordance with the City of Lexington's application for permit renewal, and after considering
comments on the draft permit, the Division of Water Quality is forwarding herewith the City's
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.
We regret the delay in processing the City's application. Notice of the draft permit was published
once in The Lexington Dispatch on June 5, 2001, and your June 29 letter was the only response
to the draft permit during the 30-day public comment period. However, the Division has been
unable to issue approximately 40 municipal permits due to programmatic issues raised by the
EPA Region 4 staff. The issues specific to Lexington's permit have now been resolved.
The final permit issued today includes the following changes from the draft permit:
• Comment: Nitrogen Limits. The draft permit included effluent limitations for Total
Nitrogen. An earlier wasteload allocation recommended these limits, but the nutrient
strategy for High Rock Lake now focuses on Total Phosphorus as the limiting nutrient.
Action: The nitrogen limits have been deleted from Condition A.(1.) of the permit (the
"effluent sheet"), and the monitoring frequency has been reduced to monthly as in the
previous permit.
• Comment: Phosphorus Limits. The draft permit does not specify the effective date of
the Total Phosphorus limits. To be consistent with the Yadkin -Pee Dee Basin -Wide
Water Quality Management Plan (the Plan), the limits should take effect in 2004.
Because the limits are seasonal mass limits, the effective date should coincide with the
start of the summer or winter season (as defined in the permit) and prior to expiration of
the new permit.
Action: Condition A.(1.) has been modified to specify that the effective date of the
Total Phosphorus limits is April 1, 2004.
1617 Mail Service Center, Raleigh, North Carolina 27699-1617 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer On the Internet at http://h2o.enr.state.nc.us/

City of Lexington: Lexington WWTP
Permit No. NC0055786
Page 2
• Comment: Credits and Phosphorus Limits. The nutrient control strategy for the Abbotts
Creek Arm of High Rock Lake calls for phosphorus limits for Lexington, Thomasville,
and High Point. It sets individual mass limits for each of the three facilities. The
collective limit represents the maximum acceptable load and is, in effect, a phosphorus
cap on the point source discharges. The Division applauds the City's willingness to
provide sewer to those facilities with failing treatment systems. However, an increase in
Lexington's phosphorus limit would require a corresponding decrease in the limits for
Thomasville and High Point.
Action: No change in the permit.
• Comment: Cyanide Monitoring. Cyanide was not detected in the plant's treated effluent
during the most recent 13 quarters of monitoring. As a result, there appears to be no
reasonable potential for the City's discharge to cause an exceedance of the water quality
standards for cyanide. The City will continue to monitor the parameter under its
pretreatment program's Long -Term Monitoring Plan.
Action: The monitoring requirements for cyanide have been deleted from Condition
A.(1.) of the permit.
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.
Please take notice that this permit is not transferable except after notice to the Division of Water
Quality. The Division may require modification or revocation and reissuance of the permit.
This permit does not affect the legal requirements to obtain other permits that may be required by
the Division of Water Quality, the Division of Land Resources, the Coastal Area Management
Act, or any other federal or local governmental permit.
If you have any questions concerning this permit, please contact Mike Templeton at telephone
number [phone], ext. 541.
Sincerely,
Original Signed By
David A. Goodrich
Gregory J. Thorpe, Ph.D.
Enclosures: NPDES Permit NC0055786
Copies (w/ encl.): Mr. Roosevelt Childress, EPA
Winston-Salem Regional Office, Water Quality
Point Source Compliance Enforcement Unit
Technical Assistance and Certification Unit
Aquatic Toxicology Unit
Central Files
NPDES Unit

1
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 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 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 N hereof.
The permit shall become effective March 1, 2002
This permit and the authorization to discharge shall expire at midnight on April 30, 2004
Signed this day January 30, 2002
Original Signed By
David A. Goodrich
Gregory J. Thorpe, Ph.D., Acting Director
Division of Water Quality
By Authority of the Environmental Management Commission

Permit NC0055786
SUPPLEMENT TO PERMIT COVER SHEET
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, and chlorine contact chamber; and
2. 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
NC0055786
Lexington Regional.
WWTP
Facility
Location
North
SCALE 1:211000

Permit NC0055786
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
Beginning on the effective date of this permit 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 Weekly Daily
Average . Average Maximum
Measurement
Frequency
Sample
Type
Sample
Location r
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 7.5 mg/L
10.0 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
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/cm2
Daily
Grab
E
Total Residual Chlorine
Daily
Grab
E
Total Phosphorus (3) (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 (3)
Composite
Calculated (3)
E
E
Cadmium (ug/L)
2/Month
Composite
E
Lead (ug/L)
2/Month
Composite
E
Mercury (ug/L)
2/Month '
Composite
E
Nickel (ug/L)
2/Month
Composite :
. E
.
Phenols (ug/L)
2/Month
Grab
E
Chromium (ug/L)
Monthly
Composite
E
Copper (ug/L)
Monthly
Composite •
E
Zinc (ug/L)
Monthly
Composite
E
Total Nitrogen (mg/L)
Monthly
Composite
E•,
Silver (ug/L)
Quarterly
Composite
E
•
Chronic Toxicity
Ceriodaphnia, P/F @ 56% (4)
Quarterly
Composite
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 BOD5 and Total Suspended Solids concentrations shall not exceed 15% of the respective influent values.
(3) Effluent limitations for Total Phosphorus shall become effective April 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. •
(4) See Condition A.(4.) of this permit.

Permit NC0055786
SUPPLEMENT TO
EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
A. (2.) 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
TKN
Depth Integrated
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. (3.) 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
(b) Seasonal Mass Loading (lb/season) = E (Monthly Mass Loadings) for the season
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. (4.) 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 Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised
February 1998, or subsequent versions or "North Carolina Phase II Chronic Whole Effluent
Toxicity Test Procedure" (Revised -February 1998) or subsequent versions. The tests will be
performed during the months of February, May, August and November. Effluent sampling for
this testing shall be performed at the NPDES permitted final effluent discharge below all
treatment processes.
If the test procedure performed as the first test of any single quarter results in a failure or ChV
below the permit limit, then multiple -concentration testing shall be performed at a minimum, in
each of the two following months as described in "North Carolina Phase II Chronic Whole
Effluent Toxicity Test Procedure" (Revised -February 1998) or subsequent versions.
The chronic value for multiple concentration tests will be determined using the geometric mean of
the highest concentration having no detectable impairment of reproduction or survival and the
lowest concentration that does have a detectable impairment of reproduction or survival. The
definition of "detectable impairment," collection methods, exposure regimes, and further
statistical methods are specified in the "North Carolina Phase II Chronic Whole Effluent Toxicity
Test Procedure" (Revised -February 1998) or subsequent versions.
All toxicity testing results required as part of this permit condition will be entered on the Effluent
Discharge Monitoring Form (MR-1) for the months in which tests were performed, using the
parameter code TGP3B for the pass/fail results and THP3B for the Chronic Value. Additionally,
DWQ Form AT-3 (original) is to be sent to the following address:
Attention: 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. (5.) 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.

I
ATM Fact Sheet - NPDES Permit
NCDENR
Noma CARouNA DerARmEtrr or
EMVtROMMENT AND NATURAL RESOURCES
Facility
Facility Name:
Permitted Flow (MGD):
Facility Class:
Facility Status:
Permit Status:
County:
Regional Office:
USGS Topo Quad:
Lexington WWTP
5.5
IV
Existing
Existing
Davidson
Winston-Salem
D18SW
(Lexington East)
City of Lexington
NPDES No. NC0055786
Receiving Stream
Receiving Stream:
Subbasin:
Index No.:
Stream Class:
303(d) Listed:
Use Support:
Drainage Area (mi2):
Summer 7010 (cfs)
Winter 7010 (cfs):
3002 (cfs):
Average Flow (cfs):
IWC (%):
Abbotts Creek
030707
12-119-(6)
WS-V and B
No
Support Threatened
182
6.7
15
18
167
56
PROPOSED PERMIT ACTION
The Division proposes to renew the City of Lexington's NPDES permit with certain revisions. The
principle change is the addition of phosphorus limits in order to address eutrophication in Abbotts
Creek and High Rock Lake.
BACKGROUND
Facility Overview
The City of Lexington owns and operates a 5.5 MGD, activated sludge wastewater treatment plant.
The plant consists of two influent pump stations, flow measurement and recording, mechanical bar
screen, grit collection, two primary clarifiers, two trickling filters, six aeration basins, two secondary
clarifiers, two polishing lagoons, chlorination, chlorine contact chamber, and outfall to Abbotts
Creek. Sludge handling consists of four anaerobic digesters (two primaries, one secondary, and one
storage) and drying beds. Sludge is dewatered using a belt filter press and then composted.
Composted sludge is stored on drying beds.
The treatment plant was modified in recent years to replace screw pumps at the influent lift
station(s) with submersible pumps.
The City administers an industrial pretreatment program to control the discharge of industrial and
commercial wastes into its collection system and treatment works. Industrial sources include three
Significant Industrial Users, one of which is a Categorical Industrial User.
Permit History
The City's NPDES Permit NC0055786 was last issued on April 26, 1994. Since that time, the permit
has been modified as follows:
• The limits for mercury and lead have been removed.

4
FACT SHEET - NPDES PERMIT City of Lexington
Page 2 NPDES No. NC0055786
• The monitoring frequencies for cadmium, lead, nickel, and mercury have been
changed from weekly to twice per month.
• The toxicity test language was updated to a more recent version, November 1995.
• The footnote pertaining to weekly monitoring of lead and mercury has been removed.
• Instream monitoring requirements were waived; as part of a Memorandum of
Understanding with Yadkin discharger, the Division waived the permit requirements,
to be replaced by a monitoring program administered collectively by the dischargers.
The permit was originally set to expire September 30, 1998. The Division administratively extended
the permit to April 30, 1999, in order to align its renewal date with other permits in the river basin.
The City submitted its application for renewal in February, 1998, and continues to operate under the
existing permit.
Water Quality
The Lexington WWTP discharges treated municipal wastewater to Abbotts Creek, a Class WS-V
and B water in the Yadkin -Pee Dee River basin.
The Division rates Abbotts Creek as Support Threatened, due to impacts on water quality from
both point and nonpoint sources in the drainage area. In 1993, the Division developed a field -
calibrated QUAL2E model of Hamby Creek and Abbotts Creek below Thomasville. The model
indicated that these streams have little capacity for oxygen -consuming wastes. Nutrients, particularly
phosphorus, heavily impact the Abbotts Creek Arm of High Rock Lake.
The Division updated its management strategy for the watershed in 1997 (Yadkin -Pee Dee River
Basinwide Water Quality Management Plan, May 1998). It recommended that (1) no new
dischargers of oxygen -consuming wastes be permitted in the watershed, (2) existing point source
dischargers in this drainage must significantly reduce nutrient discharges, and (3) the dischargers
must within one year conduct an operations optimization study for nutrient reduction.
In a 9/23/97 memo from Steve Tedder to Preston Howard, the Division proposed a nutrient
control strategy for the major dischargers into the Abbotts Creek Arm of High Rock Lake
(Lexington, Thomasville, and High Point). The Division notified the City of this strategy when the
permit was modified in 1998 and in several other discussions in recent years.
Compliance History
The City has a very good compliance record in the current permit term. Inspections by the Winston-
Salem Regional Office indicate the facility is being operated consistently and effectively. The City's
discharge monitoring reports indicate that violations of effluent limitations are infrequent at the
most. Samples collected by the Region during its inspections have verified compliance with permit
limits.
The treatment plant passed all effluent toxicity tests for the years 1996-98 but failed three tests in
1999-2000, all in the late summer months.
PROPOSED PERMIT REQUIREMENTS
Most of the effluent limitations, monitoring requirements, and special conditions in the draft permit
are the same as in the current permit. Table 1 summarizes the existing and proposed requirements
and highlights the proposed changes. The table also notes the basis for these requirements.
The most significant change is the addition of effluent limits for total phosphorus. The proposed
limits are based on the Division's nutrient control strategy for the Abbotts Creek/ Hamby Creek
drainage areas. The strategy calls for mass limits equivalent to a concentration of 0.5 mg/L TP at the

FACT SHEET - NPDES PERMIT City of Lexington
Page 3 NPDES No. NC0055786
5.5 MGD permitted flow, with seasons of 214 days (Apr -Oct) and 151 days (Nov -Mar). Total
nitrogen will continue to be monitored but not limited.
The limits and monitoring requirements for metals and cyanide are based on a reasonable potential
analysis of 1997-2001 effluent data, which were collected by the City's pretreatment program under
to its Long -Term Monitoring Plan (LIMP). The analysis indicates that no changes in limits and
monitoring requirements are warranted at this time. However, the analysis was based on stream flow
data from past Wasteload Allocations, which are higher than more recent flow estimates. It is the
NPDES Unit's policy in this situation to continue using the original flow values until the Permittee
requests a plant expansion or upgrade.
Dilution calculations indicate that the City's discharge could cause an exceedance of North
Carolina's water quality standard for chlorine (17 ug/L), using the revised flow estimates. As with
metals, the original values will be used until plant modifications prompt a full analysis of the limits.
The permit proposes monthly monitoring for phenolic compounds. Abbotts Creek is classified as a
Water Supply water, for which the state has a water quality standard of 1.0 ug/L to protect
aesthetics (taste and odor in the water and in tainted fish). At present, there are not enough data for
Lexington's discharge to determine whether or not a limit is appropriate. Monitoring under the new
permit will provide the data needed to conduct a reasonable potential analysis for phenols.

FACT SHEET - NPDES PERMIT
Page 4
Table 1- Permit Summary - Effluent Limitations and Monitoring Requirements
City of Lexington
NPDES No. NC0055786
Existing Requirements
Recommended. Requirements
Parameter
Mo. Avg. Daily Max. Monitoring
Mo. Avg. Daily Max. Monitoring
Basis for Condition(s)* & Change(s)
Outfall 001
Flow (MGD)
5.5 Cont, Rec, I or E
5.5 Cont, Rec, I or E
Current permit and application for renewal
GODS (mg/L)
5.0 S)* 7.5 (S)
10.0 ((W)* 15.0 (W) 1/day, Comp, E&I
5.0 (S)* 7.5 (S)
10.0 (W)* 15.0 (W) 1/day, Comp, E&I
Feb. 1994 Wasteload Allocation, DWQ
Total Suspended
Solids (mg/L)
30.0* 45.0 1/day, Comp, E
30.0* 45.0 1/day, Comp, E
NPDES rules for secondary treatment of
domestic wastewater (T15A: 02B .0400)
NH3-N (mg/L)
2.0 (S) 1/day, Comp, E
4.0 (W)
2.0 (S) 1/day, Comp, E
4.0 (W)
Feb. 1994 Wasteload Allocation, DWQ
Fecal coliform
(geometric mean)
Dissolved Oxygen
200/100 mL 400/100 mL 1/day, Grab, E
Daily average shall not be 1/day, Grab, E
less than 6.0 mg/L
200/100 mL 400/100 mL 1/day, Grab, E
Daily average shall not be 1/day, Grab, E
less than 6.0 mg/L
State water quality stds (T15A: 02B .0200)
Ditto
pH (S.U.)
6.0 - 9.0 1/day, Grab, E
6.0 - 9.0 1/day, Grab, E
Ditto
Temperature (°C)
Monitoring only 1/day, Grab, E
Monitoring only 1/day, Grab, E
Ditto
Conductivity
(umhos/cm2)
Monitoring only 1/day, Grab, E
Ditto
Total Residual
Monitoring only 1/day, Grab, E
Monitoring only 1/day, Grab, E
DWQ policy on chlorinated effluent
Chlorine (ug/L)
Total Phosphorus
4.910*** 6,930*** 1/wk, Comp, E
p
DWQ nutrient control strategy for the Abbotts
(lb/season)
Monitoring only 1/mo, Comp, E
Creek and Hamby Creek drainage basins
Phenols
Monitoring only 2lmo. Grab. E
Monitoring only, based on Reasonable
Potential Analysis and DWQ policy
Cadmium
Monitoring only 2/mo, Comp, E
Monitoring only 2/mo, Comp, E
Ditto
Lead
Monitoring only 2/mo, Comp, E
Monitoring only 2/mo, Comp, E
Ditto
Mercury
Monitoring only 2/mo, Comp, E
Monitoring only 2/mo, Comp, E
Ditto
Nickel
Monitoring only 2/mo, Comp, E
Monitoring only 2/mo, Comp, E
Ditto
Chromium
Monitoring only 1/mo, Comp, E
Monitoring only 1/mo, Comp, E
Ditto
Copper
Monitoring only 1/mo, Comp, E
Monitoring only 1/mo, Comp, E
Ditto
Cyanide
Monitoring only 1/qtr, Grab, E
(Deleted)
Ditto
Zinc
Monitoring only 1/mo, Comp, E
Monitoring only 1/mo, Comp, E
Ditto
Total Nitrogen (mg/L)
Monitoring only 1/mo, Comp, E
Monitoring only 1/mo, Comp, E
DWQ nutrient control strategy for the Abbotts
Creek and Hamby Creek drainage basins

FACT SHEET - NPDES PERMIT
Page 5
City of Lexington
NPDES No. NC0055786
Existing Requirements
Recommended Requirements
Parameter
Mo. Avg. Daily Max. Monitoring
Mo. Avg. Daily Max. Monitoring
Basis for Condition(s)* & Change(s)
Silver
Chronic Toxicity
Floating solids,
visible foam
Monitoring only 1/qtr, Comp, E
Ceriodaphnia, P/F @ 56.0% 1/qtr, Comp, E
Trace amounts only ---
Monitoring only 1/qtr, Comp, E
Ceriodaphnia, P/F @ 56.0% 1/qtr, Comp, E
Trace amounts only _
Ditto
State water quality stds (T15A: 02B .0200)
and DWQ policy
State water quality stds (T15A: 02B .0200)
and DWQ policy
Instream
Temperature
D.O.
Fecal coliforms
(geometric mean)
Conductivity
Total Phosphorus
TIN
NH3-N
NO2-N + NO3-N
Chlorophyll -a
3/wk**, Grab, UD
3/wk**, Grab, UD
3/wk**, Grab, UD
3/wk**, Grab, UD
1/mo, Grab, UD
1/mo, Grab, UD
1/mo, Grab, UD
1/mo, Grab, UD
1/mo, Grab, UD
3/wk**, Grab, UD
3/wk**, Grab, UD
3/wk**, Grab, UD
3/wk**, Grab, UD
1/mo, Grab, UD
1/mo, Grab, UD
1/mo, Grab, UD
1/mo, Grab, UD
1/mo, Grab, UD
T15A: 2B .0500; DWQ policy; waived so long
as City remains a member of the Yadkin -Pee
Dee River Basin Association
Ditto
Ditto
Ditto
Ditto
Ditto
Ditto
Ditto
Ditto
Special
Conditions
Chronic Toxicity
Total Phosphorus
Non -Detection
Reporting
Test procedures; reporting requirements
Clarification of monitoring & reporting
requirements
Clarification of reporting requirements for low
detection level analyses
See above
Clarification
Clarification
* and 85% reduction of Influent concentrations (based on monthly average values)
** 3/weekJun -Sep, 1/week Oct -May
*** effective Aprll 1, 2004

FACT SHEET - NPDES PERMIT
Page 6
RESPONSE TO COMMENTS ON DRAFT PERMIT
Notice of the draft permit was published once in The Dispatch, a Lexington newspaper, on June 5,
2001. The City's June 29 comment letter was the only response to the draft permit during the 30-
day public comment period.
The final permit includes the following changes from the draft permit:
• Nitrogen Limits. The draft permit included effluent limitations for Total Nitrogen. An
earlier wasteload allocation recommended these limits, but the nutrient strategy for High
Rock Lake now focuses on Total Phosphorus as the limiting nutrient.
Action: The nitrogen limits have been deleted from Condition A.(1.) of the permit (the
"effluent sheet"), and the monitoring frequency has been reduced to monthly as in the
previous permit.
• Phosphorus Limits. The draft permit does not specify the effective date of the Total
Phosphorus limits. To be consistent with the Yadkin Pee Dee Basin -Fide Water 0Quality
Management Plan (the Plan), the limits should take effect in 2004. Because the limits are
seasonal mass limits, the effective date should coincide with the start of the summer or
winter season (as defined in the permit) and prior to expiration of the new permit.
Action: Condition A.(1.) has been modified to specify that the effective date of the Total
Phosphorus limits is April 1, 2004.
• Phosphorus Limits: Credits. The nutrient control strategy for the Abbotts Creek Arm of
High Rock Lake calls for phosphorus limits for Lexington, Thomasville, and High Point. It
sets individual mass limits for each of the three facilities. The collective limit represents the
maximum acceptable load and is, in effect, a phosphorus cap on the point source
discharges. The Division applauds the City's willingness to provide sewer to those facilities
with failing treatment systems. However, an increase in Lexington's phosphorus limit
would require a corresponding decrease in the limits for Thomasville and High Point.
Action: No change in the permit.
• Cyanide Monitoring. Cyanide was not detected in the plant's treated effluent during the
most recent 13 quarters of monitoring. As a result, there appears to be no reasonable
potential for the City's discharge to cause an exceedance of the water quality standards for
cyanide. The City will continue to monitor the parameter under its pretreatment program's
Long -Term Monitoring Plan.
Action: The monitoring requirements for cyanide have been deleted from Condition A.(1.)
of the permit.
EPA REVIEW OF DRAFT PERMIT
Lexington was one of 40+ major NPDES permits delayed when EPA Region 4 raised concerns in
July 2001 over the adequacy of North Carolina's application for municipal permits. The permit was
released for issuance in January 2002 when it was pointed out that the City had used an approved
form in applying for permit renewal.

THE CITY OF
NORTH
OFFICE OF THE
CITY MANAGER
Mr. Michael E. Templeton
NPDES Unit
N.C. DENR
1617 Mail Service Center
Raleigh, NC 27699-1617
LEXINGTON
CAROLINA
"GROWING WITH THE PIEDMONT"
Subject: Draft NPDES Permit
Permit # NC0055786
Lexington WWTP
Davidson County
Dear Mr. Templeton:
June 29, 2001
0 CI
,1111_ i 0 2C01
On behalf of the City of Lexington, I would like to make the following comments and requests
about the above draft permit:
Nitrogen Limits: It is my understanding that these have been dropped from the original draft permit
as confirmed by your email to Mr. Wes Hare of the WSRO dated June 19, 2001.
Phosphorous Limits: I would request that these be implemented in the next permitting cycle or be
made enforceable at the expiration date of this permit when implemented - April 30, 2004. This
will give the City necessary time to fund and construct the facilities necessary to comply with the
proposed limits. In the period since the last issuance of this permit, our staff has made every effort
to optimize the plant's operation to reduce phosphorous in its discharge. It is our staff s
determination that this cannot be done effectively without construction. In good faith, I cannot
justify to the Lexington City Council the need for an expenditure of this magnitude unless there is a
mandated deadline. Implementing this time schedule would be consistent with the adopted Yadkin -
Pee Dee Basin Wide Water Quality Management Plan. It would also be consistent with
presentations made by various DENR modelers and planners to the Yadkin -Pee Dee River Basin
Association, which indicated that these limits would be in effect in the 2004 permitting cycle.
Phosphorous Mass Limits For and Increased Design Capacity: I would request a determination
of the mass limits for phosphorous in our discharge if the plant's design capacity were to be
increased from 5.5 to 6.0 mgd. Lexington is working with Davidson County to provide sewer to
schools and areas with failing septic tanks and wishes credit for this work. The determination of
22 WEST CENTER STREET • LEXINGTON, NORTH CAROLINA 27292 • PH. 336-248-3910 • FAX [phone]

Mr. Templeton Page 2 June 29, 2001
whether an increase in capacity is justified will be made as a part of an updated 201 facilities plan
for Davidson County. It is our contention that the mass limits should be increased proportionately
to the design flow increase (if made). We feel that an increase this small would still be consistent
with the goals set forth in the adopted Yadkin -Pee Dee Basin Wide Water Quality Management
Plan. This would preclude a penalty for correcting existing environmental problems in our basin.
In case of capacity increases to respond to future development, we would expect the mass limit for
phosphorous to not increase.
Cyanide Monitoring: The City has been monitoring for this on a quarterly basis. All samples from
1997 showed levels below the detection limit for cyanide. I hereby request that this monitoring
requirement be removed from the permit.
Sincerely,
K. 9016 at4i/Aot-d-
R. Duke Whisenant
City Manager

Subject: Re: Lexington & thomasville
Date: Thu, 12 Jul 2001 08:39:52 -0400
From: Wes Hare <[e-mail]>
Organization: NC DENR Winston Salem Regional Office
To: Mike Templeton <[e-mail]>
Mike, everything looks good to me
Mike Templeton wrote:
Hi, Wes -
The public comment period for Lexington's draft NPDES permit ended on
the 5th, and Thomasville's ended today. I got a comment letter from
Lexington last week, so far nothing from Thomasville. No public comments
for either one.
Do you have any questions or comments on these two? Please let me know
ASAP.
Here are the changes I plan to make to the Lexington permit. These may
address some of your concerns - I hope they don't add to them.
- Delete TN limits (as we already discussed), maintain monitoring
at the existing monthly frequency
- Give an effective date of April 1, 2004 for the TP limits
- Delete cyanide monitoring requirementsince the last 13 quarterly
samples were NDs (they still have to monitor for it under their LTMP/
pretreatment)
The City asked for an increase in their TP limit to account for their
connecting several failing non -discharge systems. While we can commend
the City for helping out in these situtations, we cannot grant them an
increase without making a corresponding cut at Thomasville & High Point.
Let me know whether I can move forward with these and what changes you
hope to see. Thanks for the assist.
- Mike T
NCDENR / DWQ / NPDES
1617 Mail Service Center, Raleigh, NC 27699-1617
919-733-5083 x541
919-733-0719 FAX
mailto:[e-mail]
Wes Hare
NC DENR Winston-Salem Regional Office
Division of Water Quality, Water Quality Section
585 Waughtown Street
Winston-Salem, NC 27107
Voice: [phone] ext 277
FAX: [phone]
V�f S )20

State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
Michael F. Easley, Governor
William G. Ross, Jr., Secretary
Kerr T. Stevens, Director
MEMORANDUM
f0:
From:
Subject:
May 30. 2001
Lee Spencer
NC DENR / DEH / Regional Engineer
Winston-Salem Regional Office
Mike Templeton
NPDES Unit
Review of Draft NPDES Permit NC0055786
City of Lexington WWTP
Davidson County
AVA
NCDENR
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
RECFRIED
N.C. Dept. of
JUN - 8 2001
Wirs on-`zaieln
Regional Office
Please indicate below your agency's position or viewpoint on the draft permit and return this form by
June 29, 2001. If you have any questions on the draft permit, please contact me at the telephone number
or e-mail address listed at the bottom of this page.
ww^"'wwwwwwwww�iwwwwwwwwwwwwwwwwwWNVA wwwwwwww
RESPONSE: (Check one)
R...-E-
oncur with the issuance of this permit provided the facility is operated and maintained properly. the
stated effluent limits are met prior to discharge, and the discharge does not contravene the designated
water quality standards. _-
I r'- ,
Concurs with issuance of the above permit, provided the following conditions are met: / tr^-i
0
Opposes the issuance of the above permit, based on reasons stated below, or attached: f
��
I
11
0
N
tV
Signed
Date:
424
1617 Mail Service Center, Raleigh, North Carolina 27699-1617 919 733-5083, extension 541 (fax) 919 733-0719
.G.
Visir us ON THE INTERNET © http://h2o.enr.state.nc.us/NPDES
Mike.Templeton@ ncmail.net

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AFFIDAVIT OF PUBLICATION
STATE OF NORTH CAROLINA Lexington,N.C.2001
DAVIDSON COUNTY
I a/A-- - of THE DISPATCH, a newspaper published in the city of
Lexington, County and State aforesaid, being duly sworn, says the foregoing legal of
which the attached is a true copy, was published in said newspaper once the
day of 2001.
Publication Fee $ l 03. 3,S
Sworn to and subscribed before me, this day of ;�.
•
�*b
AI
(Seal)
.. •.
K.
aye
�.�r, v,.•aas
•
hiP.Rt ` ',%tery , ,q1 it i.4 L ) 1 ! ✓ . cl v.‘)

•
REASONABLE POTENTIAL ANALYSIS
Summary for 5.5 MGD
Time Period 1997-2001
Ow (MGD) 5.5
7010S (cfs) 6.7
7Q 10W (cfs) 21.0
3002 (cfs) 29.0
Stream Flow, QA (cfs) 167.0
Rec'ving Stream Abbotts Creek
WWTP Class 4
IWC (%) @ 7Q10S 56.0
® 7Q10W 28.9
@ 3002 22.7
@ QA 4.9
Stream Class WS-V and B
City of Lexington
Lexington WWTP
NC0055786
PARAMETER
TYPE*
STDS. &
CRITERIA ••
PQL
REASONABLE POTENTIAL RESULTS
PRELIM. RESULTS
RECOMMENDED ACTION
WOS
AcuteNC
�
n
Max Pred Cw Allowable Cw
Cadmium
NC
2
15
1
.137
1.0
Acute
_ _ _ _ _
Chronic
15.0
MaxPredCw c 1/2 FAV
MONITOR
No limit
Monitor 2/month
_ _ _
3.8
MaxPredCw < NCWQS
MONITOR
Ditto
Chromium
NC
50
1.022
5
62
10.0
Acute
_ _ _
Chro_nic --
1,022
MaxPredCw < 1/2 FAV
REMOVE?
No limit
Continue to monitor 0 1/month
- - -------------
- - -
_ _
89
MaxPredCw < NCWQS
MONITOR
Ditto - - - - - - -
Copper
NC
7
(AL)
7.3
2
65
36.3
Acute
_ _ _ _ _
Chronic
7.3
MaxPredCw > Action Level
DAILY MAX. LIMIT
No limit (Action Level parameter)
Monitor 2/month
_ _
12.5
MaxPredCw > NCWQS
WK. AVG. LIMIT
Ditto
Cyanide
NC
5
22
13
0.007
Acute
_ _ _ _ _
Chronic
22.0
_ _
MaxPredCw < 1/2 FAV
REMOVE?
No limit
Continue to monitor 0 1/qtr
_
8.9
MaxPredCw < NCWQS
REMOVE?
Ditto
Lead
NC
25
33.8
5
142
10.0
Acute
•_ _ _-----
Chronic
34
------
MaxPredCw < 1/2 FAV
MONITOR --- --
MONITOR
No limit
Monitor 2/month ----------• -
Ditto - -- - -
Mercury
NC
0.012
0.2
141
0.100
Acute
- _ _-_-_
Chronic
N/A
#VALUE!
No limit
Monitor2/month -- -- -- -----
0.021
MaxPredCw > NCWQS
WK. AVG. LIMIT
Ditto - - - - ---
Nickel
NC
25
WS
261
5
138
54.5
Acute
_ _ _ _ _
Chronic
261
MaxPredCw < 1/2 FAV
MONITOR
No limit
Monitor 2/month
_ _ _
45
MaxPredCw > NCWQS
WK. AVG. LIMIT
No limit •
(Only one hit, early '98,probable outlier)
Phenol
A
1.o
wS
0
#VALUE!
Acute
_ .......
I -Citron
Chronic
N/A
_
4.4-------
NO DATA
-
NO DATA
Need data - receiving stream is WS water
_Monitor 2/month to support next RPA
Ditto------------------ ----------
Silver
NC
0.06
(AL)
1.23
19
2.5
Acute
_ _ _ _ _
Chronic
1.23
_
MaxPredCw > Action Level
DAILY MAX. LIMIT
No limit (Action Level parameter)
Monitor 2/month
---------------------
_
0.11
MaxPredCw > NCWQS
WK. AVG. UMW
Ditto-------
Zinc
NC
50
(AL)
67
10
72
110.4
I Acute
....._ _ _
Chronic
67
MaxPredCw > Action Level
DAILY MAX. LIMIT
No limit (Action Level parameter)
Monitor 2/month
Ditto----------------------------
_ _ _
89
MaxPredCw >NCWQS
WK. AVG. UMIT
• Legend:
C = Carcinogenic
NC = Non -carcinogenic
A = Aesthetic
.. Freshwater Discharge
55786 rpa.xls, 5.5 MGD
5/30/2001

REASONABLE POTENTIAL ANALYSIS
iiiftranmftwm
Cadmium
n Date Data BOL=1/20L Results
1 < 2.0 1.0 Std Dev.
2 < 2.0 1.0 Mean
3 < 2.0 1.0 C.V.
4 < 2.0 1.0 n
5 < 2.0 1.0
6 < 2.0 1.0 Mult Factor =
7 < 2.0 1.0 Max Value
8 < 2.0 1.0 Max. Pred Cw
9 < 2.0 1.0
10 < 2.0 1.0
11 < 2.0 1.0
12 < 2.0 1.0
13 < 2.0 1.0
14 < 2.0 1.0
15 < 2.0 1.0
16 < 2.0 1.0
17 < 2.0 1.0
18 < 2.0 1.0
19 < 2.0 1.0
20 < 2.0 1.0
21 < 2.0 1.0
22 < 2.0 1.0
23 < 2.0 1.0
24 < 2.0 1.0
25 < 2.0 1.0
26 < 2.0 1.0
27 < 2.0 1.0
28 < 2.0 1.0
29 < 2.0 1.0
30 < 2.0 1.0
31 < 2.0 1.0
32 < 2.0 1.0
33 < 2.0 1.0
34 < 2.0 1.0
35 < 2.0 1.0
36 < 2.0 1.0
37 < 2.0 1.0
38 < 2.0 1.0
39 < 2.0 1.0
40 < 2.0 1.0
41 < 2.0 1.0
42 < 2.0 1.0
43 < 2.0 1.0
44 < 2.0 1.0
45 < 2.0 1.0
46 < 2.0 1.0
47 < 2.0 1.0
48 < 2.0 1.0
49 < 2.0 1.0
50 < 2.0 1.0
51 < 2.0 1.0
52 < 2.0 1.0
53 < 2.0 1.0
54 < 2.0 1.0
55 < 2.0 1.0
56 < 2.0 1.0
57 < 2.0 1.0
58 < 2.0 1.0
59 < 2.0 1.0
60 < 2.0 1.0
61 < 2.0 1.0
62 < 2.0 1.0
63 < 2.0 1.0
64 < 2.0 1.0
65 < 2.0 1.0
66 < 2.0 1.0
67 < 2.0 1.0
68 < 2.0 1.0
69 < 2.0 1.0
70 < 2.0 1.0
71 < 2.0 1.0
72 < 2.0 1.0
73 < 2.0 1.0
74 < 2.0 1.0
75 < 2.0 1.0
76 < 2.0 1.0
77 < 2.0 1.0
78 < 2.0 1.0
79 < 20 1.0
80 < 2.0 1.0
81 < 2.0 1.0
82 < 2.0 1.0
83 < 2.0 1.0
64 < 2.0 1.0
85 < 2.0 1.0
86 < 20 1.0
87 < 2.0 1.0
88 < 20 1.0
:: Parameter a
n
0.00 1
1.0 2
0.000 3
137 4
5
1.00 6
1.0 ',on 7
1.0 poll 8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
Chromium
Date Data 801=1/2DL Results
< 20.0 10.0 Std Dev. 0.00
< 20.0 10.0 Mean 10.0
< 20.0 10.0 C V. 0.000
< 20.0 10.0 n 62
< 20.0 10.0
< 20.0 10.0 Mult Factor = 1.00
< 20.0 10.0 Max. Value 10.0 pgA
< 20.0 10.0 Max. Pred Cw 10.0 pail
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
c 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
< 20.0 10.0
-1-
55786 rpa.xls, data
5/17/2001

REASONABLE POTENTIAL ANALYSIS
89 < 2.0 1.0
90 < 2.0 1.0
91 < 2.0 1.0
92 < 2.0 1.0
93 < 2.0 1.0
94 < 2.0 1.0
95 < 2.0 1.0
96 < 2.0 1.0
97 < 2.0 1.0
98 < 2.0 1.0
99 < 2.0 1.0
100 < 2.0 1.0
101 < 2.0 1.0
102 < 2.0 1.0
103 < 2.0 1.0
104 < 2.0 1.0
105 < 2.0 1.0
106 < 2.0 1.0
107 < 2.0 1.0
108 < 2.0 1.0
109 < 2.0 1.0
110 < 2.0 1.0
111 < 2.0 1.0
112 < 2.0 1.0
113 < 2.0 1.0
114 < 2.0 1.0
115 < 2.0 1.0
116 < 2.0 1.0
117 < 2.0 1.0
118 < 2.0 1.0
119 < 2.0 1.0
120 < 2.0 1.0
121 < 2.0 1.0
122 < 2.0 1.0
123 < 2.0 1.0
124 < 2.0 1.0
125 < 2.0 1.0
126 < 2.0 1.0
127 < 2.0 1.0
128 < 2.0 1.0
129 < 2.0 1.0
130 < 2.0 1.0
131 < 2.0 1.0
132 < 2.0 1.0
133 < 2.0 1.0
134 < 2.0 1.0
135 < 2.0 1.0
136 < 2.0 1.0
137 < 2.0 1.0
138
139
140
141
142
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
55786 rpa.xls, data
- 2 - 5/17/2001

REASONABLE POTENTIAL ANALYSIS
11 Parameter
. .
Copper
Paraineter
. •
•
Cyanide
Date Data BDL=1/2DL Results n
< 20.0 10.0 Std Dev. 7.23 iii 1
:;i < 20.0 10.0 Mean 15.3 2
< 20.0 10.0 C.V.
0.472 3 i]::
< 20.0 10.0 n 65 4
< 20.0 10.0 5
< 20.0 10.0 Mutt Factor = 1.45 1 6
< 20.0 10.0 Max. Value 25.0 pgi :: 7
< 20.0 10.0 Max. Pred Cw 38.3 AO :ii 8
< 20.0 10.0 9
< 20.0 10.0 ...
. . . 10
. .
< 20.0 10.0 . .
...
... 11
. .
< 20.0 10.0 . .
...
• 12
10.0
< 20.0 . .
. .
.•
: :
. . . 13
< 20.0 10.0
...
• • . 14
- • . .
< 20.0 10.0
...
• • . 15
10.0
< 20.0 . .
. .
...
• • . 16
. .
< 20.0 10.0 . .
.*.
• 17
. .
. .
< 20.0 10.0 .:.
... 18
. . •
< 20.0 10.0 . .
...
... 19
. . •
< 20.0 10.0 ...
• • . . • 20
. . •
< 20.0 10.0 ...
21
< 20.0 10.0 22
< 20.0 10.0 23
< 20.0 10.0 ...
• • . 24
• • . .
< 20.0 10.0 ...
.-.
. 25
• •
. .
< 20.0 10.0 ...
... 26
...
< 20.0 10.0 . .
...
. . • 27
...
< 20.0 10.0 :
: :
. . • 28
< 20.0 10.0 ...
:
: .•
. . . 29
•
< 20.0 10.0
... 30
< 20.0 10.0 id 31
< 20.0 10.0 32
< 20.0 10.0 iii 33
< 20.0 10.0 34
< 20.0 10.0
. .
...
... 35
...
< 20.0 10.0 . .
...
. . • 36
• • •
< 20.0 10.0 : :
. . . 37
...
< 20.0 10.0 : :
• . .. 38
. .
< 20.0 10.0 39
< 20.0 10.0 40
< 20.0 10.0 i]; 41
< 20.0 10.0 42
< 50.0 25.0 . .
43
< 50.0 25.0 rii 44
< 50.0 25.0 45
.. < 50.0 25.0 ...
as
• • •
. .
< 50.0 25.0 ...
• •
. 47
. .
. .
< 50.0 25.0 ...
• •
. 48
. .
. .
< 50.0 25.0 ...
...
. 49
. .
. .
< 50.0 25.0 ...
...
. 50
. .
< 50.0 25.0 . .
...
...
. 51
. .
< 50.0 25.0 . .
...
. . • 52
. .
< 50.0 25.0 ...
• • . . - 53
. .
< 50.0 25.0 ...
...
. . 54
. .
< 50.0 25.0 ...
• • .
.
55
< 50.0 25.0 .• :
. 56
. .
< 50.0 25.0 :IA
< 50.0 25.0 57 58
< 50.0 25.0 59
. .
< 50.0 25.0 . .
. 60
. .
< 50.0 25.0 • • 61
< 50.0 25.0
• 62
. .
< 50.0 25.0 .
63
< 50.0 25.0 64
< 50.0 25.0 65
. .
66
67
68
. .
. . 69. .
70
71
72
. .
73
. .
. .
:.: 74
75
ii 76
n
78
6079
8
81
83
84
as
86
87
Date Data BDL=1/2DL Results
< 0.01 0.006 Std Dev. 0.00
< 0.01 0.005 Mean 0.0
< 0.005 0.003 C.V. 0.203
< 0.005 0.003 n 13
< 0.01 0.005
< 0.01 0.005 Mutt Factor = 1.44
< 0.01 0.005 Max Value 0.0 pgl
< 0.01 0.005 Max. Pred Cw 0.0 lig/I
< 0.01 0.005
< 0.01 0.005
< 0.01 0.005
< 0.01 0.005
< 0.01 0.005
55786 rpa.xts, data
-3- 5/17/2001

REASONABLE POTENTIAL ANALYSIS
89 89
90 90
91 91
92 92
93 93
94 94
95 95
96 96
97 97
98 98
99 99
100 100
101 101
102 102
103 103
104 104
105 105
106 106
107 107
108 108
109 109
110 110
111 111
112 112
113 iii 113
114iii 114
115 115
116 116
117 iii 117
118 118
119 119
120 120
121 121
122 122
123 123
124 124
125 125
126 126
127 • 127
128 128
129 129
130 • 130
131 131
132111 132
133 133
134 134
135 135
136ill 136
137 137
138 iii 138
139 139
140 140
141 141
142 ii 142
55786 tpa.xls, data
• 4 • 5/17/2001

REASONABLE POTENTIAL ANALYSIS
Parameter
•
n Date Data BDL=1/2DL Results
1 < 20 0 10.0 Std Dev. 0.00
2 < 20.0 10.0 Mean 10.0
3 < 20.0 10.0 C.V. 0.000
4 < 20.0 10 0 n 142
5 < 20.0 10.0
6 < 20.0 10.0 Mutt Factor = 1.00
7 < 20.0 10.0 Max. Value 10.0 pg/I
8 < 20.0 10.0 Max. Pred Cw 10.0 pg/I i
9 < 20.0 10.0
10 < 20.0 10.0
11 < 20.0 10.0
12 < 20.0 10.0
13 < 20.0 10.0
14 < 20.0 10.0
15 < 20.0 10.0
16 < 20.0 10.0
17 < 20.0 10.0
18 < 20.0 10.0
19 < 20.0 10.0
20 < 20.0 10.0
21 < 20.0 10.0
22 < 20.0 10.0
23 < 20.0 10.0
24 < 20.0 10.0
25 < 20.0 10.0
26 < 20.0 10.0
27 < 20.0 10.0
28 < 20.0 10.0
29 < 20.0 10.0
30 < 20.0 10.0
31 < 20.0 10.0
32 < 20.0 10.0
33 < 20.0 10.0
34 < 20.0 10.0
35 < 20.0 10.0
36 < 20.0 10.0
37 < 20.0 10.0
38 < 20.0 10.0
39 < 20.0 10.0
40 < 20.0 10.0
41 < 20.0 10.0
42 < 20.0 10.0
43 < 20.0 10.0
44 < 20.0 10.0
45 < 20.0 10.0
46 < 20.0 10.0
47 < 20.0 10.0
48 < 20.0 10.0
49 < 20.0 10.0
50 < 20.0 10.0
51 < 20.0 10.0
52 < 20.0 10.0
53 < 20.0 10.0
54 < 20.0 10.0
55 < 20.0 10.0
56 < 20.0 10.0
57 < 20.0 10.0
58 < 20.0 10.0
59 < 20.0 10.0
60 < 20.0 10.0
61 < 20.0 10.0
62 < 20.0 10.0
63 < 20.0 10.0
64 < 20.0 10.0
65 < 20.0 10.0
66 < 20.0 10.0
67 < 20.0 10.0
68 < 20.0 10.0
69 < 20.0 10.0
70 < 20.0 10.0
71 < 20.0 10.0
72 < 20.0 10.0
73 < 20.0 10.0
74 < 20.0 10.0
75 < 20.0 10.0
76 < 20.0 10.0
77 < 20.0 10.0
78 < 20.0 10.0
79 < 20.0 10.0
80 < 20.0 10.0
81 < 20.0 10.0
82 < 20.0 10.0
83 < 20.0 10.0
84 < 20.0 10.0
85 < 20.0 10.0
86 < 20.0 10.0
87 < 20.0 10.0
88 < 20.0 10.0
Parameter=
Mercury
n Date Data BDL=1/20L Results
1 < 0.2 0.1 Std Dev 0.00
2 < 0.2 01 Mean 0.1
3 < 0.2 0.1 C V 0.000
4 < 0.2 0.1 n 141
5 < 0.2 0.1
6 < 0.2 0.1 Mult Factor = 1.00
7 < 0.2 0.1 Max Value 0.1 pg/I
8 < 0.2 0.1 Max Pred Cw 0.1 pg/I
9 < 0.2 0.1
10 < 0.2 0.1
11 < 0.2 0.1
12 < 0.2 0.1
13 < 0.2 0.1
14 < 0.2 0.1
15 < 0.2 0.1
16 < 0.2 0.1
17 < 0.2 0.1
18 < 0.2 0.1
19 < 0.2 0.1
20 < 0.2 0.1
21 < 0.2 0.1
22 < 0.2 0.1
23 < 0.2 0.1
24 < 0.2 0.1
25 < 0.2 0.1
26 < 0.2 0.1
27 < 0.2 0.1
28 < 0.2 0.1
29 < 0.2 0.1
30 < 0.2 0.1
31 < 0.2 0.1
32 < 0.2 0.1
33 < 0.2 0.1
34 < 0.2 0.1
35 < 0.2 0.1
36 < 0.2 0.1
37 < 0.2 0.1
38 < 0.2 0.1
39 < 0.2 0.1
40 < 0.2 0.1
41 < 0.2 0.1
42 < 0.2 0.1
43 < 0.2 0.1
44 < 0.2 0.1
45 < 0.2 0.1
46 < 0.2 0.1
47 < 0.2 0.1
48 < 0.2 0.1
49 < 0.2 0.1
50 < 0.2 0.1
51 < 0.2 0.1
52 < 0.2 0.1
53 < 0.2 0.1
54 < 0.2 0.1
55 < 0.2 0.1
56 < 0.2 0.1
57 < 0.2 0.1
58 < 0.2 0.1
59 < 0.2 0.1
60 < 0.2 0.1
61 < 0.2 0.1
62 < 0.2 0.1
63 < 0.2 0.1
64 < 0.2 0.1
65 < 0.2 0.1
66 < 0.2 0.1
67 < 0.2 0.1
68 < 0.2 0.1
69 < 0.2 0.1
70 < 0.2 0.1
71 < 0.2 0.1
72 < 0.2 0.1
73 < 0.2 0.1
74 < 0.2 0.1
75 < 0.2 0.1
76 < 0.2 0.1
77 < 0.2 0.1
78 < 0.2 0.1
79 < 0.2 0.1
80 < 0.2 0.1
81 < 0.2 0.1
82 < 0.2 0.1
83 < 0.2 0.1
84 < 0.2 0.1
85 < 0.2 0.1
86 < 0.2 0.1
87 < 0.2 0.1
88 < 0.2 0.1
-5-
55786 rpa.xls, data
5/17/2001

REASONABLE POTENTIAL ANALYSIS
89 < 20.0 10 0
90 < 20.0 10.0
91 < 20.0 10.0
92 < 20.0 100
93 < 20.0 10 0
94 < 20.0 100
95 < 20.0 10.0
96 c 20.0 10.0
97 < 20.0 10.0
98 < 20.0 10.0
99 < 20.0 10.0
100 < 20.0 10.0
101 < 20.0 10.0
102 < 20.0 10.0
103 < 20.0 10.0
104 < 20.0 100
105 < 20.0 10.0
106 < 20.0 10.0
107 < 20.0 10.0
108 < 20.0 10.0
109 < 20.0 10.0
110 < 20.0 10.0
111 < 20.0 10.0
112 < 20.0 10.0
113 < 20.0 10.0
114 < 20.0 10.0
115 < 20.0 10.0
116 < 20.0 10.0
117 < 20.0 10.0
118 < 20.0 10.0
119 < 20.0 10.0
120 < 20.0 10.0
121 < 20.0 10.0
122 < 20.0 10.0
123 < 20.0 10.0
124 < 20.0 10.0
125 < 20.0 10.0
126 < 20.0 10.0
127 < 20.0 10.0
128 < 20.0 10.0
129 < 20.0 10.0
130 < 20.0 10.0
131 < 20.0 10.0
132 < 20.0 10.0
133 < 20.0 10.0
134 < 20.0 10.0
135 < 20.0 10.0
136 < 20.0 10.0
137 < 20.0 10.0
138 < 20.0 10.0
139 < 20.0 10.0
140 < 20.0 10.0
141 < 20.0 10.0
142 < 20.0 10.0
89 < 0.2 0.1
90 < 0.2 01
91 < 0.2 01
92 < 0.2 0.1
93 < 0.2 0 1
94 < 0.2 0.1
95 < 0.2 0.1
96 < 0.2 0.1
97 < 0.2 0.1
98 < 0.2 0.1
99 < 0.2 01
100 < 0.2 0.1
101 < 0.2 0.1
102 < 0.2 0.1
103 < 0.2 0.1
104 < 0.2 0.1
105 < 0.2 0 1
106 < 0.2 0.1
107 < 0.2 0.1
108 < 0.2 0.1
109 < 0.2 0.1
110 < 0.2 0 1
111 < 0.2 0.1
112 < 0.2 0.1
113 < 0.2 0.1
114 < 0.2 0.1
115 < 0.2 0.1
116 < 0.2 0.1
117 < 0.2 0.1
118 < 0.2 0.1
119 < 0.2 0.1
120 < 0.2 0.1
121 < 0.2 0.1
122 < 0.2 0.1
123 < 0.2 0.1
124 < 0.2 0.1
125 < 0.2 0.1
126 < 0.2 0.1
127 < 0.2 0.1
128 < 0.2 0.1
129 < 0.2 0.1
130 < 0.2 0.1
131 < 0.2 0.1
132 < 0.2 0.1
133 < 0.2 0.1
134 < 0.2 0.1
135 < 0.2 0.1
136 < 0.2 0.1
137 < 0.2 0.1
138 < 0.2 0.1
139 < 0.2 0.1
140 < 0.2 0.1
141 < 0.2 0.1
142
55786 rpa.xls, data
- 6 - 5/17/2001

REASONABLE POTENTIAL ANALYSIS
Parameter
Nickel
n Date Data BDL=1/2DL Results
1 < 20.0 10.0 Std Dev. 3.15
2 < 20.0 10.0 Mean 10.3
3 < 20.0 10.0 C.V. 0.307
4 < 20.0 10.0 n 138
5 < 20.0 10.0
6 < 20.0 10.0 Mult Factor = 1.16
7 < 20.0 10.0 Max. Value 47.0 AA
8 < 20.0 10.0 Max. Pred Cw 54.5 pgll
9 < 20.0 10.0
10 < 20.0 10.0
11 < 20.0 10.0
12 < 20.0 10.0
13 < 20.0 10.0
14 < 20.0 10.0
15 < 20.0 10.0
16 < 20.0 10.0
17 < 20.0 10.0
18 < 20.0 10.0
19 < 20.0 10.0
20 < 20.0 10.0
21 < 20.0 10.0
22 < 20.0 10.0
23 < 20.0 10.0
24 < 20.0 10.0
25 < 20.0 10.0
26 < 20.0 10.0
27 < 20.0 10.0
28 < 20.0 10.0
29 < 20.0 10.0
30 < 20.0 10.0
31 < 20.0 10.0
32 < 20.0 10.0
33 < 20.0 10.0
34 < 20.0 10.0
35 < 20.0 10.0
36 < 20.0 10.0
37 < 20.0 10.0
38 < 20.0 10.0
39 < 20.0 10.0
40 < 20.0 10.0
41 < 20.0 10.0
42 < 20.0 10.0
43 < 20.0 10.0
44 < 20.0 10.0
45 < 20.0 10.0
46 < 20.0 10.0
47 < 20.0 10.0
48 < 20.0 10.0
49 < 20.0 10.0
50 < 20.0 10.0
51 < 20.0 10.0
52 < 20.0 10.0
53 < 20.0 10.0
54 < 20.0 10.0
55 < 20.0 10.0
56 < 20.0 10.0
57 < 20.0 10.0
58 < 20.0 10.0
59 < 20.0 10.0
60 < 20.0 10.0
61 < 20.0 10.0
62 < 20.0 10.0
63 < 20.0 10.0
64 < 20.0 10.0
65 < 20.0 10.0
66 < 20.0 10.0
67 < 20.0 10.0
68 < 20.0 10.0
69 < 20.0 10.0
70 < 20.0 10.0
71 < 20.0 10.0
72 < 20.0 10.0
73 < 20.0 10.0
74 < 20.0 10.0
75 < 20.0 10.0
76 < 20.0 10.0
77 < 20.0 10.0
78 < 20.0 10.0
79 < 20.0 10.0
80 < 20.0 10.0
81 < 20.0 10.0
82 < 20.0 10.0
83 < 20.0 10.0
84 < 20.0 10.0
85 < 20.0 10.0
86 < 20.0 10.0
87 < 20.0 10.0
88 < 20.0 10.0
Phenol
Date Data BDL_1/2DL Results
Std Dev. NO DATA
Mean NO DATA
C V. NO DATA
n 0
Mult Factor = #VALUE!
Max Value 0.0 mill
Max. Pred Cw #VALUE! pgll
.7.
55786 rpa.xls, data
5/17/2001

REASONABLE POTENTIAL ANALYSIS
89 < 20.0 10.0
90 < 20.0 10.0
91 < 200 10.0
92 < 20.0 10.0
93 < 20.0 10.0
94 Feb-98 47 0 47 0
95 < 20.0 10.0
96 < 200 10.0
97 < 20.0 10.0
98 < 20.0 10.0
99 < 20.0 10.0
100 < 20.0 10.0
101 < 20.0 10.0
102 < 20.0 10.0
103 < 20.0 10.0
104 < 20.0 10.0
105 < 20.0 10.0
106 < 20.0 10.0
107 < 20.0 10.0
108 < 20.0 10.0
109 < 20.0 10.0
110 < 20.0 10.0
111 < 20.0 10.0
112 < 20.0 10.0
113 < 20.0 10.0
114 < 20.0 10.0
115 < 20.0 10.0
116 < 20.0 10.0
117 < 20.0 10.0
118 < 20.0 10.0
119 < 20.0 10.0
120 < 20.0 10.0
121 < 20.0 10.0
122 < 20.0 10.0
123 < 20.0 10.0
124 < 20.0 10.0
125 < 20.0 10.0
126 < 20.0 10.0
127 < 20.0 10.0
128 < 20.0 10.0
129 < 20.0 10.0
130 < 20.0 10.0
131 < 20.0 10.0
132 < 20.0 10.0
133 < 20.0 10.0
134 < 20.0 10.0
135 < 20.0 10.0
136 < 20.0 10.0
137 < 20.0 10.0
138 < 20.0 10.0
139
140
141
142
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121.
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
55786 rpa. xls, data
- 8 - 5/17/2001

• REASONABLE POTENTIAL ANALYSIS
Parameter =
Sliver
Date Data BDL_1/2DL Results
< 5.0 2.5 Std Dev. 0.00
< 5.0 2.5 Mean 2 5
< 5.0 2.5 C.V. 0.000
< 5.0 2.5 n 19
< 5.0 2.5
< 5.0 2.5 Mult Factor =
< 5.0 2.5 Max Value
< 5.0 2.5 Max Pred Cw
< 5.0 2.5
< 5.0 2.5
< 5.0 2.5
< 5.0 2.5
< 5.0 2.5
< 5.0 2.5
< 5.0 2.5
< 5.0 2.5
< 5.0 2.5
< 5.0 2.5
< 5.0 2.5
1.00
2.5 Oil
2.5 pg/l
Parameter =
[Zinc
n Date Data BDL=1/2DL Results
1 28.7 28.7 Std Dev. 15.14
2 44.0 44.0 Mean 35.8
3 43.8 43.8 C.V. 0.423
4 41.5 41.5 n 72
5 37.0 37.0
6 40.0 40.0 Mutt Factor = 1.38
7 56.0 56.0 Max Value 80.0 pgrl
8 45.0 45.0 Max Pred Cw 110.4 pgt
9 47.0 47.0
10 73.0 73.0
11 53.0 53.0
12 63.0 63.0
13 60.0 60.0
14 65.0 65.0
15 35.0 35.0
16 23.0 23.0
17 < 20.0 10.0
18 45.0 45.0
19 45.0 45.0
20 < 20.0 10.0
21 49.0 49.0
22 80.0 80.0
23 Jan-98 40.0 40.0
24 Feb-98 43.0 43.0
25 Mar-98 53.0 53.0
26 Apr-98 48.8 48.8
27 Apr-98 37.5 37.5
28 Apr-98 22.9 22.9
29 Apr-98 24.9 24.9
30 May-98 44.0 44.0
31 Jun-98 26.0 26.0
32 Jut-98 < 20 10.0
33 Aug-98 27.0 27.0
34 Sep-98 38.0 38.0
35 Oct-98 49.0 49.0
36 Nov-98 < 20.0 10.0
37 Nov-98 33.0 33.0
38 Nov-98 34.0 34.0
39 Nov-98 36.0 36.0
40 Nov-98 35.0 35.0
41 Nov-98 55.0 55.0
42 Dec-98 40.0 40.0
43 Jan-99 < 50 25.0
44 Jan-99 < 50 25.0
45 Jan-99 < 50 25.0
46 Jan-99 < 50 25.0
47 Jan-99 < 50 25.0
48 Feb-99 < 50 25.0
49 Mar-99 < 50 25.0
50 Apr-99 53.0 53.0
51 May-99 < 50 25.0
52 Jun-99 < 50 25.0
53 JuI-99 < 50 25.0
54 Aug-99 < 50 25.0
55 Sep-99 < 50 25.0
56 Oct-99 < 50 25.0
57 Nov-99 < 50 25.0
58 Dec-99 < 50 25.0
59 Jan-00 < 50 25.0
60 Feb-00 57 57.0
61 Mar-00 62.4 62.4
62 Apr-00 < 50 25.0
63 May-00 < 50 25.0
64 Jun-00 < 50 25.0
65 Jun-00 < 50 25.0
66 Jul-00 < 50 25.0
67 Jul-00 < 50 25.0
68 Aug-00 < 50 25.0
69 Sep-00 < 50 25.0
70 Oct-00 53.5 53.5
71 Nov-00 < 50 25.0
72 Dec-00 < 50 25.0
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
-9-
55786 rpa.xls, data
5/17/2001

REASONABLE POTENTIAL ANALYSIS
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
138
137
138
139
140
141
142
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
55786 cpaxls, data
- 10 - 5/17/2001

• IWC CALCULATIONS
Facility:
Owner:
Permit No.:
Design Avg. Flow (MGD):
Receiving Stream:
7010 (summer, CFS):
7010 (winter, CFS):
WO Std, CI (ug/L):
WQ Std, NH3 (summer, mg/L):
WQ Std, NH3 (winter, mg/L):
Upstream CI (ug/L):
Upstream NH3 (mg/L):
Residual Chlorine
7010 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (UG/L)
UPS BACKGROUND LEVEL (UG/L)
IWC (%)
Allowable Concentration (ug/L)
Fecal Limit
(based on 331 : 1 7010 : Ow)
Lexington WWTP
City of Lexington
NC0055786
5.5
Abbotts Creek
6.7
15
28
1.0
1.8
0.0
0.22
Ammonia as NH3
(summer)
6.7 7010 (CFS)
5.5 DESIGN FLOW (MGD)
8.525 DESIGN FLOW (CFS)
28.0 STREAM STD (MG/L)
0 UPS BACKGROUND LEVEL (MG/L)
56.0% IWC (%)
30.4 Allowable Concentration (mg/L)
200/100m1
Ammonia as NH3
(winter)
7010 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (MG/L)
UPS BACKGROUND LEVEL (MG/L)
IWC (%)
Allowable Concentration (mg/L)
6.7
5.5
8.525
1.0
0.22
56.0%
1.6
15 •
5.5
8.525
1.8
0.22
56.0%
4.6
55786 IWCs for NH3, C12.xls
MET, 5/18/2001

IWC CALCULATIONS
Facility:
Owner:
Permit No.:
Design Avg. Flow (MGD):
Receiving Stream:
7010 (summer, CFS):
7010 (winter, CFS):
WQ Std, CI (ug/L):
WQ Std, NH3 (summer, mg/L):
WQ Std, NH3 (winter, mg/L):
Upstream CI (uglL):
Upstream NH3 (mg/L):
Residual Chlorine
7010 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (UG/L)
UPS BACKGROUND LEVEL (UG/L)
IWC (%)
Allowable Concentration (uglL)
Fecal Limit
(based on 331 : 1 7010 : Qw)
Lexington WWTP
City of Lexington
NC0055786
5.5
Abbotts Creek
3.0
15.0
28.0
1.0
1.8
0.0
0.22
Ammonia as NH3
(summer)
3.0 7010 (CFS)
5.5 DESIGN FLOW (MGD)
8.525 DESIGN FLOW (CFS)
28.0 STREAM STD (MG/L)
0 UPS BACKGROUND LEVEL (MG/L)
74.0% IWC (%)
23.0 Allowable Concentration (mg/L)
200/100mI
Ammonia as NH3
(winter)
7010 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (MG/L)
UPS BACKGROUND LEVEL (MG/L)
IWC (%)
Allowable Concentration (mg/L)
3.0
5.5
8.525
1.0
0.22
74.0%
1.3
15.0
5.5
8.525
1.8
0.22
74.0%
4.6
55786 IWCs for NH3, C12.xls
MET, 5/18/2001

Whole Effluent Toxicity Testing Self -Monitoring Summary February 16, 2001
FACILITY REQUIREMENT YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC'
Lenoir- Lower Creek W31TP Penn chr lira: 409'.; when pf 6MGD chr dim 445: 1997 - Pass
NC0023981/001 Begin: II/1/1998 Frcquency: Q P/F + Feb May Aug Nov + NonComp:Single 1998 - Pass
County: Caldwell Region: ARO Subbasin: CTB31 1999 - Pass
PF: 6.0 Special 2000 -_ Pass
7010: 11.75 IWC(%):44 Order. 2001
Lexington Regional WWTP
NC0055786/OOI Bcein:6/1/I 994
Pass - - Pass -
Fa8.Pass - - Fab Pass
Fail 89.4 <20 81 -
Pass - -- Pass
NR
Pass
Fail.Pass
Pass
Pass
PERM CHR LIM: 56;: Y 1997 - Pass - Pass - Pass - - Pass
Frequency: Q P/F + Feb May Aug Nov NonComp:SINGLE 1998 - Pass - - Pass - -- Pass - Pass
County. Davidson Rcgion: WSRO Subbasin: YADO7 1999 -- Pass -- - Pass ••- >100,Fail --- -- Pass
PF: 5.5 Spacial 2000 - Pass - - Pass Fail>90 39.6 >90.Passt Pass
7010: 6.7 IWC('/-)55.09 Order: 2001
Libber -Owens Fnrd Co. Penn 24 hr p/f ac lim: 90% fthd (grab) 1997 -- Pass - -- Pass -- --- Pass --- - H
NC(1049514/001 Begin:12/1/1999 Frequency: Q P/F + Jan Apr Jul Oct + NonComp:Singlc 1998 -- Pass --- - Pass -- --- Pass •••
County: Scotland Region: FRO Subbasin: LUM55 1999 •- P355 -- - Pass - --- •-- Pass - Pass
PF: VAR sn«ial 2000 Late Pass - Pass - - Pass - Pass -
7QI0:0.0 IWC(91):108 OM., 2001
Pass
Liberty Fabrics. Inc. Perm 241up/faclim: 90°/ ford
NC0023710/001 Begun: 611/1997 Frequency: Q + Mar Jun Scp Dcc
County: Manor Rcgion: WARO Subbam: ROA09
PF: 0.45 Sp,xial
7Q18: 1201) IWC(•0:.06 (friar
+ NonComp:Singlc
1997 - - Pass - Pass - Pass Pass
1998 - - Pass - - Pass - Pass - - P889
1999 - - Pass - - Pass - Pass - Pass>90
2000 - - Pass.>90 - - Pass - - Pass - - Pass_>90
2001
L(Iiingmn W W FP Penn 24 hr p/f ac lim: 90%
NC0021636/001 Bcgm:5/1/1996 Frequency: Q + Jan Apr Jul Oct
County: Harnett Rcgion: FRO Subba.m: CPF07
PF: 0.6 Spacial
7010: 5511.0 IWC(%):0.17 order:
NonCornp:Singlc
1997 Pass - Pass
1998 Pass - - Pass
1999 Pass - - Pass
2000 Pass - - Pass
2001 Pass
Pass Pass -
Pass -- Pass - -
-_ Pass -- - Pass - -
- P355 -- -- Pass - -
Lincolnton WWTP Pcrm chr lim: I 1
NC0025496/001 Bcgtn:9/1/1995 Frcqucncy: Q P/F + Mar Jun Scp Dcc
County: Lincoln Rcgion: MRO Subbasin: CTB3S
PF: 6.0 Spacial
7Q10: 77.0 IWC(%):11.0 Order:
NonComp: Smcic
1997 - - Fail Pass - Pass -- Pass .•- Pass
1998 - - Pass - - Pass - Pass - Pass
1999 - - Pass - - Pass - -- Pass - Pass
2000 - - Pass - - Pass •-- Pass NR
2001
Linville Resorts, Inc. Perm chr lim: TY.; if cap to 0.15 chr lim 10% 1997
NC0039446/001 Bcgirr:12/1/2000 Frcqucncy: Q Jan Apr Jul Oct + NonComp:Singlc 1998
County: Avery Rcgion: ARO Subbasin: CTB30 1999
PF: 0.10 Spacial 2000
7010: 2.) IWC(%):10.0 Order: 2001
Lithium Corp Penn chr lim: 78%;pf 0.7 chr dim 80%;pf 0.8 chr lim 82%;pf0.9 Y 1997 >100(s) -- - 88(s) - - 61>100(s) - - 76.5.88.3 76.5(s) >100(s)
NC0005177/001 Begin:5/1/1997 Frcqucncy: Q P/F + Jan Apr Jul Oct + NonComp:Singlc 1998 >100(s) - >100 - - >100 - - 88.3 - -
County: Gaston Rcgion: MRO Subbasin: CTB37 1999 >100 - - >100 - - >100 - - H >100
PF: 0.615 Special 2000 >100 - >100 - - >100 - - >100 -
7Q I0: 0.27 IWC(%):78 Order: 2001
Livingstone Coating Corporation Perm chr lim: 90%
NC0086002/001 Bcgin:10/1/1997 Frequency: Q P/F + Jan Apr Jul Oct
County: Mcckicnburg Rcgion: MRO Subbasin: CTB34
PF: 0.0216 Spacial
7Q10:11.0 IWC( ):100 Order:
+ NonComp:Singlc
1997 - - - - -- - - - - H - ..-
1998 H - - Pass - - Pass - - Pass
1999 Pass - - Pass -- - Pass - Pass
2000 pass - Pass - - Pass - Pass - -
2001 Pass
Louis Dreyfus Energy Corp. Pcrm 24hr LC50 ac manil cpis Rhd (grab) 1997 - - >100 - - - -
N00026247/001 Bcgin:8/1/1996 Frequency: A NonComp: 1998 >100 -- - -
C-ount. (iwlfenl Rcgion: WSRO Subbasin: CPF08 1999 >100 - -- - - - --
PF \A Special 2000 >lo0 - - - - - - •- -
7Q 111. 11.1) IWCI•1.I:I(8) Order: 2001
Lmlis Dreyfus Energy Corp. Penn: 24 hr LC50 uc moon cpis Ohl) (grab) 1997 - - - - - - >100
\C0021971/009 Bcgm:5,I/1995 Prcqucncy: A NonComp: 1998 - - - - >100 - - - -
County: Mecklenburg Region: MRO Su6hacm: CT634 1999 - - - >100 - - - - - - - -
PF: VAR Special 2000 - - - - >100 - -
70111: 0.1) IWCI•0d:100 (refer: 2001
Y Pre 1997 Data Available
LEGEND:
PERM = remit Requirement LET = Adnlinistmtive Lana - Target Frequency = Monitoring frequency: Q. Quarterly; M. Monthly; BM- Bimonthly; SA- Semiannually; A- Annually; OWD- Only when discharging; D- Discontinued monitoring rcquircmcnt
Begin = First month required 7Q10 = Receiving stream low flow criterion (cfs) += quancrly 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% = Instream waste concentration P/F = Pass/Fail test AC = Acute CHR = Chronic
Data Notation: f- Fathead Minnow; • - Ccriodaphnia sp.; my - Mysid shrimp; ChV - Chronic value; P - Mortality of stated percentage at highest concentration; at - Performed by DWQ Aquatic Tox Unit; bl - Bad tar
Reposing Notation: -- = Data not required; NR - Not reported Facility Activity Status: 1- Inactive, N - Newly I.ssued(To construct); H - Active but not discharging; f-More data available for month in question; • = ORC signaturc needed
29

LONG-TERM MONITORING PLAN REQUEST FORM
FACILITY:
NPDES NO.:
EXPIRATION DATE:
REGION:
NPDES REQUESTOR:
PRETREATMENT CONTACT:
DATE OF REQUEST:
City of Lexington WWTP
NC0055786
4/30/99
Winston-Salem
Mike Templeton 1C
p �'
Paul Clark
3/26/99
rECE 0
MAR 2 6 1999
PRETPrgTrAr-rIT GROUP
RESPONSE REQUESTED BY: 4/5/99 (Paul, I'll be out of the office next week)
INDICATE THE STATUS OF PRETREATMENT PROGRAM:
1) THE FACILITY HAS NO SIU'S AND SHOULD NOT HAVE PRETREATMENT LANGUAGE.
2) THE FACILITY HAS OR IS DEVELOPING A PREATREATMENT PROGRAM.
3) ADDITIONAL CONDITIONS REGARDING THE PRETREATMENT PROGRAM ATTACHED.
PERMITTED FLOW:
SIU contributions
% INDUSTRIAL
% DOMESTIC
NOTE:
The City's NPDES permit was modified in July 1998. Based on reasonable potential analyses, we
removed limits for mercury and lead; also modified monitoring frequecies of metals and cyanide as
follows: 2/month for mercury, cadmium, nickel, and lead; monthly forchromium, zinc, and copper; and
quarterly for cyanide and silver. Request Pretreatment Unit's comments on whether we should modify
these or other parameters in this permit renewal. Also, identify any adjustments you would like to see in
the pretreatment conditions for this facility. 5,// /,IAAej
U �aa4,-m-`' B/n f? //if
5.5 MGD �p S/_s
??Z o, 2Y //o-b l�e�
#VALUEt
# AL-LtE!
acrv,J • Q� ,BDL 7.sS
ace �x/urc>4d1 /D 4)
CO TACT:
A through D: Tom Poe /14/es/4/1 e `�'` '4'/c`O/4�7-ta'n`)41'4 414-`� i-e ""e1 I"; 4-7rP
E through L: Paul Clark °''e' ,'-` '° -� 're�`"''cee"e.'
M through R: Dana Folley Mn �, dae cP 00-e
S through Z: �Stteve Amigon[eea /
e'4 S/Us
o.leierisc o a-= )44/ iozil e no)/ 241
%'i 'P 1)tS
AMP cair/4/44Ls
mce a-ce. ^ d�+ y d Atd c a�c-e fir �.�.�1V i4 '�- .." As -iv'
i � �xi
(�' U ,,it7)4-J 4Q Io.,/ e� -7 55786 Itmp_reqst, 3/26/99
114..1U e. ..-C ec '"^ h"--4a ash us-, c ,-, ,e.

r lotice, ` of Ynteitt 'w ; { ' r
b s.. , kt .i'.4 ,„jf,'o,;.sw. :+.5 'q,;,::0.4 t•,yy ,t �7 ,b �..:'t•.
,•,4'+a'"?` iToF..4thyDurahoi)ofNPDESDiscbvgcpf{mttsin.IbeYodkin+Riverbasinp' }�i
UBJEC7`sThe Div of ter ly lags lo eaten urnuon of the current NPDES Pe� of r
VnY�°FiGq .�lcC' [r� �C' -i . c'.. �p(� fo�to ng
q'eimit4. ll''t,v Facility r� . 1 '.. ,'',Cit .i^ fi, ;t!'!4' t ' t,t t r�%I
Y 'l 1 � () �7 '� t+wiv'iCunl l4 ; dye
:NQ0024112 't'4Thomuvdle•Wyaf h v14 i+? t�yh,` r �a Y F'
NC0024228i' .t>�° r+ Y r 7 t�DAVIDSONrL�l:t.•
rgh.Porgt Wcststde WWT 'ti N' v r pAVIDSON NC0028037 xin tont'NTPMI &,2 jvl`ar 6 r• fd 0�"• ' '` +•. Y
+i••}N00034452rt>j-Willowcreek6uilderx;I s��"1 i • �'� " 1 'e�'' •DAVIDSON.
3 ; �--- r rp M,I,
v.,NC0036561 CenterclairNuram Home r. .. r x# t "1t 7,I '`-DAVIDSON-i.• tt
gam ; NC0041491' Patadisaitlotel,�pg fir h �i .. Y DAVIDSON*,.. Cjh_
NC0041629'd ,,Daadse,MoteI hootYr}ill211 „� 4Jyw ,DAVIDSONIft/ j,,.
1 ty; stExtended Day5 ? , r
drool J• . , 1, l�'aa `t DAVIDSONt u.
NCOD42081 � DaYidson,CoyntysSchpols•l.edford Spnlut HI h, . �•k' - '-
. NC0042129•jt, Davidson, CouptySchools•PilotElement -'^�tt, :.3f✓r+'l:. r C y7,: 'FDAVIDSON..
"hNC0042145 P Davidson CountycSchools-Midwo Flom •- tit): 5''reit `�fi DAVIUSON•�i1;
NC0049689.;:• y ., "Ti„_:: DAVIDSON G1
r$ *Pleasant Qrove;TrailoiPark {:A Cr'+Z tr ' *s•' ^�•f-s ' ►'
4NC0055786 '� r r �s. • • sr31tL.3'+'Z+. V( to DAVIDSON r 91 t
'Lexington Regional•�y1y1'p� tti': Q ti '." ' �M
00059757 S Livingcenters, SFJ n Cen g {(! tr Dr�V1DSO ,�Q F
.,s4NC0046035+t.,HighPoineCareCenterXltit;` 4,, _�.� i
N ti Hi Jv �'>t ' FORSYTII '• :r n' C0051713 ,:r,Lakevlew.Mobile HomOPark ' •f� .'?j • j..,
-N000552I2 {� PAurnanII Mobile tiome park;1 r: ><) • Til,.>aul 2.`�sf' FORSY941c.:44;44
r i'1z00084786+ '. T Im•nurc.Illysvatpr j Inc ' s ro r
PURPOSE: The facrhuea lixted above all disclrargeinto the.Yadlun,Rivftbasin ;Other permits.in tho Yadkin River basin ?Y 3�. ¢ 'ihaYe e4Prraliog datei in endar 999 ' ' -
-+• r calendar Yean1 , ,7he facihucs l{sled apoY9 have permit expiration dales 'An J998
,' a orderfor the Dlvtstgn,to evaluutrt all pernul;reneylak re,q ,l4`xtryt .}ydkin,R; cr basin' during tltm,same calendar year,,ihepivisionplanstoextend fN.Caplrauond.leYo(the'permits for the facilitiesJis)edabo e,13}L
xNoconditionsJn the existing pemuts'will bcFltangcd oPhwdi(4ed.77ds U anaadministrative .change,t .t'��1..4
'%,,better, align permitting:andDasinwldePlanniniggperatlant 1thinihe'DlYtslonof.WaterQuality'.DnTlI. the bahic:of preliminaryataf(rcYiewY ofAnicla;21 _of Chaptel5143;,General Statues of N Una,(ao)' S
atterlawful st►ndardaand regulations), the No Carolina t dY
ph FatyitonmenucMpfiagemenieo rsaion
a'�rvpaaes lq extend �the �Onnuil nipf the k Rr its irstesen ye a9bject} ifrc'poU .ant` i lotions -',
Rectal cowiti ,p-•! i.1,4 '' !eAt r'w iI 'S
TJ,ON AcopyRftheexrstrn PD r r�4,ir ci�GgiA
g.I`!, ES' mu{s +!nsa rJ:etc Iacali
yttp labl kby wn rgrg orcallmg,."rC "v1k:+ aQi of1°rgn vJ01T?
1 rr,,,,.M Charles Weaver
M � 1d�°; NC DF. $1Ve'DWQ�:NPR lltrri 15 1 f r + '"
rK t aP,O.�i..... Srt{ [t.:ti +`•;,? .•+• .Xh:',+a..s.ih
:t �'°`'r' n, `�'t`•Ralugh,:t�lor(h Carolina 27626 Q535,, Yr 1'" ' t„'!i- iri tom{
f.
4. •:; F.P, Telephonenumyen;'(919)733�50834xt-•5,I17 y r•-, ,,,t1,r.i; -�'�1
gig Pennilxare on frlc,at the Divrisipq•or,Wates QJrulity,1Arehdale,D uildjne',312J•yg131r SaI,squry SueetlRoomt,
11,925)Ralcigh, onlicarol ina.Thry wy:bioI0Kctcdduring,nonnal;9ftcehoun:•CopiestONIAinfomiulioot
"PIAt . o"file 'areta`satlubl�upoq u • a pay n,uflhoco, pf roducti
�S• x .} •.� t r �a },r, `.t�`t �,.� .. „ru+.��. f c P. .. „�1St�Zd�,q'�(Cj'f
pg, p/ 8;7::1' ,.✓,David A7.Ooodnch,c 7.'t V. ' ,,,,�;
Ilr,r _ .r (ytci" 1p') c'Sti
_'.. , C}���. s-4APrcxlon;HownidrJf„P,E::Dircclor-r
•r U. PL' '�f+Divixionof:WaterQuality`%< 1, 4'iis�
9•
.°NORTH CAROLINA
,DAVIDSON COUNTY
1
I '
AFFIDAVIT OF PUBLICATION
„1
Before the undersigned, a Notary Public of said
County and State, duly commissioned, qualified, and
authorized bx �law to �i inister paths, personally
appeared ,,.1- •u,�e.....u.lex.anc rs who
be'rig fist duly swlorn, deposes and says: that he is
of The
Thomasville Times, Inc., engaged in the publication of
a newspaper known as The Thomasville Times,
published, issued, and entered as second class mail in
the City of Thomasville in said County and State; that
he (she) 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 che, Thomasville Ties orL the following dates:
; 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 Statutes
.:..of North Carolina and was a qualified newspaper
within the meaning of Section 1-597 of the General
Statutes of North Carolina.
This ,.42..: f......day of 'YY1'�`C'�19 `-/ El
Swjn to nd su jscribed before me, this .�1.,.J..,
ay f ...
otary Public
SANDRA D. SPANN
My Commission Expires NOTARYP.U6l,C
DAVIDSON COUNTY, C
MY COMMISSION EXPIRES LQ UOo
�00
60. 00
rip
9.606'

♦
1
2
Permit No. NC0055786
SUPPLEMENT TO EFFLUENT LIMITATIONS
AND MONITORING REQUIREMENTS
SPECIAL CONDITIONS
Sample locations: E — Effluent, I — Influent
Instream Monitoring Requirements
Instream sampling shall be conducted as follows:
Parameter
Sample Type
Frequency
Months
*Location
_
June - September
October — May
U, D
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
U, D
Surface
Monthly
TKN
Depth Integrated
Monthly
U, D '
Surface
Monthly
NH3
Depth Integrated
Monthly
U, D
Surface
Monthly
Chlorophyll -a
Depth Integrated
Monthly
D
Surface
Monthly
NO2 + NO3
Depth Integrated
Monthly
U, D
Surface
Monthly
*U — Upstream at I-85, D — Downstream at Highway
3 The monthly average effluent BOD5 and Total Suspended Residue concentrations shall not exceed
15% of the respective influent value (85% removal).
4 The daily average dissolved oxygen effluent concentration shall not be less than 6.0 mg/L.
5
The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units and shall be
monitored daily at the effluent by grab sample.
There shall be no discharge of floating solids or visible foam in other than trace amounts.

Permit No. NC0055786
SPECIAL CONDITIONS continued
6 CHRONIC TOXICITY PASS/FAIL PERMIT LIMIT (QRTRLY)
The effluent discharge shall at no time exhibit chronic toxicity using test procedures outlined in the `North
Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised November 1995, or subsequent
versions.
The effluent concentration at which there may be no observable inhibition of reproduction or significant
mortality is 56.0% (defined as treatment two in the procedure document). The permit holder shall perform
quarterly monitoring using this procedure to establish compliance with the permit condition. 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.
All toxicity testing results required as part of this permit condition will be entered on the Effluent
Discharge Monitoring Form (MR-1) for the month in which it was performed, using the parameter code
TGP3B. Additionally, DWQ Form AT-1 (original) is to be sent to the following address:
Attention: Environmental Sciences Branch
North Carolina Division of Water Quality
4401 Reedy Creek Road
Raleigh, North Carolina 27607
Test data shall be complete and accurate and include all supporting chemical/physical measurements
performed in association with the toxicity tests, as well as all dose/response data. 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 any single quarterly monitoring indicate a failure to meet specified limits, then monthly monitoring
will begin immediately until such time that a single test is passed. Upon passing, this monthly test
requirement will revert to quarterly in the months specified above.
Should the permittee fail to monitor during a month in which toxicity monitoring is required, then monthly
monitoring will begin immediately until such time that a single test is passed. Upon passing, this monthly
test requirement will revert to quarterly in the months specified above.
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.

(City of merit xixtgtiin
28 West Center Street, Lexington, N.C. 27292
[phone]
June 16, 1998
Mr. Dave Goodrich
Permits and Engineering
P.O. Box 29535
Raleigh, N.C. 27626-0535
Re:
City of Lexington
Davidson County
Lexington Regional WWTP - NC0055786
Subject: Request to Remove Effluent Limits for Mercury and Lead from the Permit
Dear Mr. Goodrich:
Renewal of our NPDES Permit was originally slated for September 30, 1998. Because of the
implementation of basin wide permitting, the permit renewal has been delayed until the middle
of 1999. In our renewal application I requested that the limits and monitoring for mercury and
lead be dropped upon renewal.
Because of the delay in renewal, I am requesting that the limits for these metals be dropped from
the permit. I do agree to continue monitoring these metals until the permit is renewed.
In support of this request, a review of our DMR will show no measurement of these metals in
over 12 months. I am also sending copies of some of our recent laboratory sheets to support this
information.
Please forward any questions to my attention at 336-243-2489.
Sincerely,
Roger path
cc: Jeff Edmonds
Gisele Comer

Analysis
'Application Name C:1Program Files\GBC AA Ver 1.11Jan98GFASSPbNiCr.anl
Date Mon Feb 2310:03:131998
Method
EHT: approx. volts
6/6/97--548
Instrument Parameters
System Type
Element
Matrix
Lamp Current
Wavelength
Slit Width
Slit Height
Instrument Mode
Furnace
Pb
Wastewaters
4.0 mA
283.3 nm
0.5 nm
Reduced
Abs. BC On
Sample Measurement Parameters
Measurement Mode
Sample Introduction
Time Constant
Replicates
Dilution Factor
Maximum Dilutions
Calibration Parameters
Calibration Mode
Concentration Units
Concentration Decimal Places
Calibration Failure On
Cal Failure Limit R2 Value
Cal Failure Action
Measure Sample Blank After Cal
Auto Save After Cal
Quality Parameters
Second Fail Action
Range Checking
Minimum Sample Conc
Low Sample Fail Action
Low Sample Flag
Maximum Sample Conc
High Sample Fail Action
High Sample Flag
Check Sample Conc
Check Sample Lower Range
Check Sample Upper Range
Check Sample Fail Action
Check Sample Flag
Spike Conc
Spike Volume
Spike Recovery Lower Range
Spike Recovery Upper Range
Spike Fail Action
Spike Flag
Peak Area
Automatic
0.0 s
3
0.40
4
Conc Least Squares
ug/L
1
R2 Value
0.995
Stop
No
Yes
Stop
On
20.000 ug/L
Continue
<20
50.000 ug/L
Continue
>50
40.000 ug/L
90.0%
110.0%
Rescale & Repeat
QCOUT
50.000 ug/L
0 ul
80.0%
120.0%
Continue

0
.' + Final Ramp Hold Gas Signal
" Step Temp. Time Time Type Read Graphics
(C) (s) (s)
Step 1 Inject Sample
Step 2 80° 1.0 10.0 Inert Off Off
Step 3 130° 35.0 10.0 Inert Off Off
Step 4 700° 15.0 5.0 Inert Off Off
Step 5 700° 0.5 0.5 None Off Off
Step 6 1850° 1.4 0.6 None On On
Step 7 2600° 1.0 2.0 Inert Off Off
PAL Parameters
Injection Speed 9 ul/s
Sample Preparation Auto-Calc
Auto-Calc Standard 1 Volume 8 ul
Auto-Calc Sample Volume 20 ul
Auto-Calc Modifier Volume 4 ul
Auto-Calc Aux. Mod. Volume 0 ul
Auto-Calc Total Volume 24 ul
Full Calibration
Calibration Mode
Conc. Least Squares Max Error. 0.120 R2: 1.000
Sample Conc. %RSD Mean
Label (ug/L) Abs.
Cal Blank ----- 1.52 0.007
20 ug/L Std 20.0 0.72 0.145
40 ug/L Std 40.0 0.59 0.265
50 ug/L Std 50.0 0.35 0.318
Absorbance
0.350
0.000o
55
Concentration of Pb (ug/L)
Sample Conc. %RSD Mean
Label (ug/L) Abs.
Check Sample 40.2 0.55 0.267
100.6% of expected
Sample Blank 2/3/98 ---- 3.45 0.005
Eff 1/5-6/98-1 0.8 13.07 0.006
<20

,,Same • - Conc. %RSD Mean
Label (ug/L) Abs.
Eff 1/5-6/98-2 1.3 9.43 0.011
<20
Eff 1/12-13/98-1 1.1 7.33 0.009
<20
Eff 1/12-13/98-2 1.7 7.61 0.014
<20
Eff 1/20-21/98-1 1.4 3.80 0.011
<20
Eff 1/20-21/98-2 1.8 7.57 0.014
<20
Eff 1126-27/98-1 2.9 2.06 0.023
<20
Eff 1/26-27/98-2 7.1 1.55 0.055
<20
Check Sample 41.5 3.16 0.274
103.9% of expected
Duracell 1/5-6198 FAIL HIGH -0.000
Duracell 1/6-7/98 0.3 18.25 0.002
<20
Duracell 1/7-8/98 0.8 8.95 0.006
<20
Duracell 1/8-9/98 0.7 11.69 0.006
<20
Cardinal 1/5-6/98 1.2 10.59 0.010
<20
Cardinal 1/6-7/98 1.8 19.85 0.014
<20
Cardinal 1f7-8/98 24.6 6.41 0.175
Cardinal 1/8-9/98 51.6 3.26 0.326
>50
Cardinal 1/8-9/98 22.0 5.96 0.068
0.40 Dilution
Check Sample 40.0 0.77 0.266
100.1 % of expected
Lex Dye 1/12-13/98 0.2 HIGH 0.001
<20
Lex Dye 1/13-14/98 3.6 4.62 0.028
<20
Lex Dye 1 /14-15/98 2.0 3.74 0.016
<20
Lex Dye 1/15-16/98 0.2 HIGH 0.002
<20
Stone 1/13-14/98 FAIL HIGH -0.008
Stone 1/14-15/98 2.5 HIGH 0.020
<20
Stonel/15-16/98 2.4 9.68 0.019
<20
AEPM 1/23/98 0.9 HIGH 0.007
<20
Check Sample 43.1 0.78 0.282
107.7% of expected
Stanley 1 /26-27/98 16.8 2.64 0.124
<20

S'am ip . .
-Label
Stanley 1/27-28/98
Stanley 1/28-29/98
Stanley 1/29-30/98
Check Sample
109.6% of expected
#6MH 1/3-2/4
#6MH 1/3-2/4
#1 MH 1/3-2/4
Check Sample
104.2% of expected
Sample Blank
Duracell 2/1/98 cell
Check Sample
84.4% of expected
Rescale Calibration
Calibration Mode
Conc. %RSD Mean
(ug/L) Abs.
13.0 1.30 0.098
<20
20.0 4.77 0.145
3.9 1.47 0.031
<20
43.8 1.27 0.286
3.2 1.49 0.026
<20
2.7 5.44 0.021
<20
6.0 2.04 0.047
<20
41.7 0.13 0.274
1.53
FAR... 1.39
33.8 2.26
QCOUT
o.
-o.og4.
o.i3o
Conc. Least Squares Max Error 0.120 R2: 1.000
Sample Conc. %RSD Mean
Label (ug/L) Abs.
Rescale Blank ----- 2.91 0.020
Rescale Standard 40.0 2.77 0.259
Absorbance
0.343
0.000o
Concentration of Pb (ug/L)
Sample Conc. %RSD Mean
Label (ug/L) Abs.
Sample Blank ----- 0.64 0.060
Duracell 2/1/98 cell FAIL 8.78 -0.046
55

—Sct,
•
S ample Blank 'Sample Blank 2/3/98
Sample Eff1/20-21i98-1
Sample Eff 1/20-21/98-2
Sample Eff 1/26-27/98-1
Sample Eff 1/26-27/98-2
Sample Eff 1 /26-27/98-S pike
Sample Eff 2/2-3/98 -1
Sample Eff 2/2-3/98-2
Check Sample Check Sample
Sample Lex Dye 1114-15/98
Sample 1Lex Dye 1115-16/98
Sample Stone 1 /14-15/98
Sample Stonel /15-16/98
Sample Stanley 1 /26.27/98
Sample Stanleyl/27-28/98
Sample Stanle 1 /28 29/98
Sample 1
Sample 2
Sample 3
Sample 4
Sample 5
Sample 6
Sample 7
S ample 8
Standard 4
Sample 9
1.000
1.000
1.000
1.000
1.000
1.000
1.000
1.000
1.000
Sample 10 1.000

•
li) GBC AA Ver 11 - Samples (Jan 9842)
—111111111P1111MNINICUININIIIIIIMINOMINIIIIME11111
_-s
•
17,7
,; hieastaerient Label Position`- ...!Iokurie
Sample !Lex Dye 1/14-15/98 Sample 9 1.000
Sample ___ ^ Lex Dye 1/15-16/98 Sample 10 1.000
Sample . Stone 1 /1 4-15/98_ --- __. w Sample 11---- 1.000
Sample Stone1115-1CAA ample 12 _--1.000
Sample _,______:Stanley 1 /26-27/98 _________ Sample 13 -.. 1.000 ___
Sample ,Stanley 1 /27-28/98 -- Sample 14 1.000
Sample Stanley 1/28-29/98 Sample 15 1.000
Sample Stanley 1/29-•30/98 Sample 16 1.000
CheckSample Check Sample Standard 7 1.000
Sample -Link Taylor 2/2-3/98 Sample 17 1.000
Sample jFoam Tech2/2-3/98 Sample 18 1.000
Sample 1p,FPM a Sample 19 1.000
Sample 141MH 1 f 5_— Zl er,Sample 20 1.000
Sample —_ I#6MH l J,,rI/ ISarnple 21 1.000
Check Sample Check Sample Standard 7 1.000
Check Sample •Check Sample Standard 8 1.000
22
2Y-'',,fi'J
•
Mk( Urfie li
=
A

-r T
Lj
IiL
0 -0
I
NE-10___k a 3
eAif0 YVN-k-V/3_
1Tru. 0\3_:Lf',cZ
apAicc- "kik

v
Analysis
Application Name C:1Program tiles\GBC AA Ver 1.11Analysis2.ant
Date Thu Feb 05 17:29:45 1998
Method
ENT: approx. 329 volts
Instrument Parameters
System Type
Element
Matrix
Lamp Current
Wavelength
Slit Width
Slit Height
Instrument Mode
Flame
Hg
Wastewaters
3.0 mA
253.7 nm
0.5 nm
Normal
Abs. BC On
Sample Measurement Parameters
Measurement Mode
Sample Introduction
Read Time
Time Constant
Replicates
Delay Time
Rinse Time
Method Final Rinse
Micro Sampling
Probe Height
Calibration Parameters
Calibration Mode
Auto Burner Rotation
Concentration Units
Concentration Decimal Places
Calibration Failure On
Cal Failure Limit R2 Value
Cal Failure Action
Measure Sample Blank After Cal
Auto Save After Cal
Quality Parameters
Second Fail Action
Range Checking
Minimum Sample Conc
Low Sample Fail Action
Low Sample Flag
Maximum Sample Conc
High Sample Fail Action
High Sample Flag
Check Sample Conc
Check Sample Lower Range
Check Sample Upper Range
Check Sample Fail Action
Check Sample Flag
Integration
Automatic
5.0 s
0.1 s
2
50.0 s
30.0 s
50.0 s
Off
15 mm
Conc Least Squares
Off
ug/L
3
R2 Value
0.995
Stop
No
Yes
Stop
On
0.200 ug/L
Continue
<0.2
2.000 ug/L
Continue
>2.0
1.000 ug/L
90.0%
110.0%
Rescale & Repeat
QCOUT

v
FlameControl Parameters
Flame Type
Fuel Flow
Oxidant Flow
Burner Angle
Workhead Height
Full Calibration
Calibration Mode
Sample
Label
Table Blank
0.2 ug/L
0.3 ug/L
0.5 ug/L
1.0 ug/L
1.5 ug/L
2.0ug/L
Absorbance
0.191
0.000
0.00
Conc.
(ug/L)
0.200
0.300
0.500
1.000
1.500
2.000
Air -Acetylene
2.00 Umin
10.0 Umin
0.0°
15.5 mm
Conc. Least Squares Max Error 0.074
%RSD Mean
Abs.
0.000
0.023
0.026
0.042
0.084
0.135
0.173
R2:
Sample
Label
Eff 1 /20-21,
Eff 1 /26-27,
Eff 2/2-3/9E
Lex Dye 1 /'
Stanley 1 /21
Stanley 1/2
Foam Tech
#6MH
Concentration of Hg (ug/L)
Weight Volume
1.000 1.000
1.000 1.000
1.000 1.000
1.000 1.000
1.000 1.000
1.000 1.000
1.000 1.000
1.000 1.000
Sample
Label
Sample Blank 2/3/98
Eff 1/20-21/98-1
Eff 1/20-21/90-2
Conc.
(ug/L)
0.006
<0.2
FAIL
Sample
Label Weight
Eff 1 /20-21, 1.000
Eff 1 /26-27i 1.000
Check Sam 1.000
Stone 1/14- 1.000
Stanley 1 /2' 1.000
Check Sam 1.000
AEPM 1.000
Check Sam 1.000
Volume
1.000
1.000
1.000
1.000
1.000
1.000
1.000
1.000
%RSD Mean
Abs.
0.05 3.845
HIGH 0.001 .40 ,
HIGH -0.001
2.20
Sample
Label Weight Volume
Eff 1/26-27,
Eff 2/2-3/9E
Lex Dye 1/'
Stonel /15-•
Stanley 1 /2.
Unk Taylor
#1 MH
Check Sam
1.000 1.000
1.000 1.000
1.000 1.000
1.000 1.000
1.000 1.000
1.000 1.000
1.000 1.000
1.000 1.000

%RSD Mean
Abs.
SO-nplei . .
`Label
Conc.
(ug/L)
Eff 1/26-27/98-1
Eff 1/26-27/98-2
Eff 1/26-27/98-Spike
Eff 2/2-3/98 -1
Eff 2/2-3/98r2
Check Sample
92.0% of expected
Lex Dye 1/1415/98
Lex Dye 1/15-16/98
Stone 1/14-15/98
Stonel/15-16/98
Stanley 1/26-27/98
Stanley 1/27-28/98
Stanley 1/28-29/98
Stanley 1/29-30/98
Check Sample
93.5% of expected
Link Taylor 2/2-3/98
Foam Tech2/2-3/98
AEPM t jlcar
#1 MH 11qk.
#6MH ANag`
Check Sample
100.4% of expected
Check Sample
1 01.4% of expected
0.008
<0.2
FAIL HIGH
0.936 1.37
0.112 2.89
<0.2
FAIL HIGH
0.920 0.94
4.67 0.001 L(}i 2. \ GO. Z
-0.000 .LO1 L.
0.085 6154 °/
0.011•,Z.
-0.003 1-01 :.
0.083 O
FAIL HIGH -0.003 L0 1 Z
0.036 HIGH `0.003
<0.2 . L.01
Z
FAIL HIGH -0.002 LD, 2-
FAIL HIGH -0.001 4_0,
0.377 3.48 0.036 0, 3'? `7
0.141 HIGH 0.013 'A
<0.2
0.500 1.22 0.047 0 • Q D
0.121 1.06 0.012 IQ, 2-
<0.2
0.935 0.09 0.085
c
0.173 HIGH 0.016 LO , 2
<0.2
FAIL HIGH -0.001 Ld 1 Z'
0.030 HIGH 0.003 ziOi
<0.2
0.705 2.00 0.065 0,70 5
2.054 0.80 0.174 ` 0 51
>2.0
1.004 0.20 0.091 o
1.014 0.77 0.092 0,

NC0055786 City of Lexington
6/20 Received request for removal of lead and mercury limits.
7/7 Typed effluent page, footnotes, and special conditions.
Class IV facility, WQ limited. Monitoring should be 2/month for toxicants.
Lead and mercury:
Did not have to do Reasonable Potential. All monitoring is <0.2 µg/1 for mercury; <20 µg/1 for lead.
Removed limits and changed the monitoring frequency from weekly to 2/month.
Removed the following footnote pertaining to sampling of lead and mercury:
"The permittee may choose to collect 5 samples for the week and base the number of
analysis run on the outcome of the first sample. If the first sample is in compliance with
the weekly average limit, then no more analyses need be run for that week. If the first
sample is above the weekly average, then subsequent samples shall be analyzed and
compliance with both the weekly average and daily maximum limits shall be required."
Cadmium and nickel:
One nickel hit in 2/98 of 47 µg/1, all others <20 µg/I. Allowable = 34, max predicted = 66. Due
to only one hit, it will be considered an outlier.
All cadmium monitoring has been <2 µg/l.
Changed the monitoring frequencies from weekly to 2/month.
Updated toxicity test language to November 1995 version.
At renewal per WLA, nutrient limits will be effective: TP 0.5 mg/1, TN 4/8 mg/1 (sum/win)
Will mention this in cover letter

(itg of711exington
28 West Center Street, Lexington, N.C. 27292
[phone]
February 25, 1998
Mr. Dave Goodrich
N.C. DENR-DWQ
P.O. Box 29535
Raleigh, N.C. 27626-0535
Re: Application for Permit Renewal
Permit #NC0055786
Lexington Regional WWTP
City of Lexington
Davidson County
Dear Mr. Goodrich:
Pg1©2111'Y.
0 :) 1o,.,...�
FO!N= SOURCE BRANCH
4,t 69103y
ffixa°
Attached are three copies of an application for renewal of our NPDES Permit NC0055786 and a
check for $1125 to cover fee.
I am requesting that any instream monitoring terms of the MOA between the State and members
of the Yadkin PeeDee River Basin be included in the final permit.
Please forward any questions regarding this to my attention at 336-243-2489.
Sincerely,
CITY OF LEXINGTON
Roger Spach
RS/kb
cc: Steve Mauney

•
STANDARD FORM A —MUNICIPAL
SECTION rig. INDUSTRIAL WASTE CONTRIBUTION TO MUNICIPAL SYSTEM
11011 ASINCY Ysr l
111111 Ii
Submit a description of each maw' industrial facility discharging to the awllclNl oystewt. VSIIIg a fapafata Sattloo IV foe cacti !Witty damp -
Lion. Indicate the 4 digit Standard Industrial Gasification (SIC) Code for the Wintry. the ethos product 01 far instwtaf. the flow fin thr+..•
sand lotions per day). and the characteristics of the wastewater dlrchargad frees tin Industrial facility Into the muaiclpal System. Consult :stile
111 for standard measures Of producb Or raw m1terials. (sae Inslrlittlons)
1. Myer Centrtbuting Facility
(see Instructions)
Neme
Number& Street
City
County
State
Zip Code
2. Primary Standard industrial
Classification Code (see
instructions)
2. Principal Product or Raw
Material (see InstruCttons)
Irroauct
Raw Material
4. Flew Indicate the volume of water
discharged into the wwnictpsi sys-
tem in thousand pitons par day
and whether this discharge b inter-
mittent or continuous.
S. Pretreatment ►revteed Indttate it
pretreatment is provided Arlo, to
entering Me municipal system
4. C4aresterlstics of wastewaar
(sae Instructions)
ftsbi
oaramst•r
Name
•aramet er
NumOer
value
1 Hg *
71900
.002
lbs/day
401 a
401 b
401c
401 d
401 e
401 f
402
403s
403b
404a
404b
40S
Duracell, USA IU #0011
305 New HWY 64 East
Lexington
Davidson
NC
27292
3692
Battery Manufacturing
Zinc, Lithium Dry Cells
19 - .40 thousand Mont Ow day
D intermittent (Inti5Continuova(ton)
w O'o
u ntity
Units flee
Table 111)
r
*only parameter limited
•PO 015.701
This section cantsins 1 aia+f.

STANDARD FORM A -MUNICIPAL
SECTION W. INDUSTRIAL WASTE CONTRIBUTION TO MUNICIPAL SYSTEM
PO* AG NCv u:r 1
I I I
Sabine a description of each major Industrial facility discharging to t►e MunicIOMISFPAIM. mina a opiate S etlon IV for tech tunny Oescnp
tion. Indicate the a digit Standard Industrial Classification (SIC) Cod. for the I0/ustry. Use motor product or raw material. ttw flow (In the►..•
ssmd gallons par day), and the characteristics of the wastewater discharged front the Industrial facility Into the munIClpal fytton+. Consult : Mae
111 for standard measures of products or raw -materials. (see Instructions)
1.
Maim Contributing Faculty
(Me instructions)
Name
Number$ Street
City
County
State
Zip Code
2. Primary Standard Industrial
Classification Code (sot
Instructions)
3. Principal Product or Raw
Material (tee In$trutteon$)
Product
Paw Material
4. ream Indicate the •Oturna Of water
discharged into the municipal aye.
tern In thousand pitons per day
and whether this discharge Is Inter-
mittent or continuous.
S. Pratwatinent Provided Indicate if
pretreatment es provided Omer t0
antenna tie munICloal system
S. COaraetsdstics sf Wastewater
(re imtatrvctions)
Mid
4014
401b
401c
401 d
cote
401f
402
403a
4030
404a
4040
405
Cardinal Container Services IU #0010
105 Walser Road
Lexington
Davidson
NC
27292
7699 & 5093
Drum Conditioning
drum. steel,
various chemicals
25 — 30 thousand lotions Per day
Intermittent (Int) Q •nuft hll(con)
ave1 QNo
•
ri
Quantity
Nid
Units (foe
Table 111)
Psramet . 1 BOD I TSS
Name
' Cd
Cr
Pb
Zn
Ni
Parameter
WumDer
00310
I 00530
01027
01034
0105,1
01092
01067
wigs
118
168
.002
.04
.022
1.84
.041
lbs/day
lbs/day
Hg (719001
.0002
lbs/day
lbs/day
lbs/day
lbs/day lbs/day
lbs/day
Cu
01042
.173
lbs/day
• CPO 44S.7011
TWO Section congaing 1 lets.

STANDARD FORM A —MUNICIPAL
SECTION W. INDUSTRIAL WASTE CONTRIBUTION TO MUNICIPAL SYSTEM
FOR AGENCY Ulf 1
-1
Submit a description of each major industrial facility dlsCharaimg to the mitnlctpal system. teeing a asparste SWUM IV tar each facility descrsp
tlon. Indicate the 4 digit Standard Industrial Clarilt(Gatlon (SIC) Code for the Industry. the maw product or raw material. the now tin thew,
sane Sallons per day). and the characteristics of trio wastewater discharged from the industrial facility Into the municipal system. Consult : sole
III for standard measures of productf or raw -materials. (sae instructions)
.
1.
Myer Contrlbutlwg freclt)ty
(No Instructions)
Name
Nurnberg. Street
City
County
State
Zip Code
2. Priwlary Standard Industrial
Classification Code (see
Instructions)
3. ►rind'at !Product or Raw
Material We instructions)
Product
Raw Material
4. Flew Indicate the votumse of water
discharged into the municipal sys-
tem in thousand gallons pa day
and whether this discharge Is Inter•
lftttent or continuous.
if. Pretreatment provided Indicate if
pretreatment is provided prior to
entering the municipal system
6. Coaractsetstles of Wastewater
(Ma Instructions)
less
as
401 e
4010
401c
401d
401e
4011
402
403s
4030
404a
4040
40g
Lexington Dye and Finish IU #0006'
303 Albemarle St.
Lexington
Davidson
NC
27292
2258
Dyed Lace Cloth
Dyes and Lace Knitting.
25 - 3.0 thousand gattans pee say
Q Intermittent (tnt1Continuou$(eon)
Q ►es 0No
sw
Quantity
Units (See
Table i11)
'Parameter
I BOD 1 TSS
Pb
Cu
Cr
Cd
Hg
paraeter m
.
"UM."
00310
00530
01051
.01042
01034
01027
.71900
Value
29
36
.002
.003
.001
.001
.00001
lbs/day
Zn
01092
.012
lbs/day
lbs/day
CN
00720
.01
lbs/day
lbs/day lbs/day
lbs/day lbs/day lbs/day
Ni
01067
.001
lbs/day
CPO 015./0e
This *Wien calltsbls t dale.