NC0055786_Permit (Issuance)_20090710

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:
July 10, 2009
Thies document is printed on reuse paper - ignore any
content on the reYerse side

,,i
ern
NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins Dee Freeman
Govemor Director Secretary
July 10, 2009
Mr. Roger Spach
Water Resources Superintendent
The City of Lexington
28 West Center Street
Lexington, North Carolina 27292
Subject: Issuance of NPDES Permit NC0055786
Lexington Regional WWTP
Davidson County
Dear Mr. Spach,
Division personnel have reviewed and approved your application for renewal of the subject permit. •
Accordingly, we are forwarding the attached NPDES discharge permit. This permit is issued pursuant to the
requirements of North Carolina General Statute 143-215.1 and the Memorandum of Agreement between North
Carolina and the U.S. Environmental Protection Agency dated October 15, 2007 (or as subsequently amended).
This final permit includes no major changes from the draft permit sent to you on April 21, 2009.
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 demand is made, this decision shall be final and binding.
Please note that this discharge ultimately flows to High Rock lake, which is listed as impaired on the 303(d)
list for chlorophyll -a due to excessive nutrient inputs. A TMDL is currently in progress, and nutrient limitations are
a potential future requirement.
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
Location: 512 N. Salisbury St. Raleigh, North Carolina 27604
Phone: [phone] FAX: [phone] Customer Service: 1-877-623-6748
Internet: www.ncwaterquality.org
An Equal Opportunity 1 Affirmative Action Employer
one
NCarolina

Please note that this permit is not transferable except after notice to the Division. The Division may
require modification or revocation and reissuance of the permit. This permit does not affect the legal requirements
to obtain other permits which may be required by the Division of Water Quality or permits required by the
Division of Land Resources, the Coastal Area Management Act or any other Federal or Local governmental permit
that may be required. If you have any questions concerning this permit, please contact Sergei Chernikov at
telephone number [phone].
Sincerely,
Coleen H. Sullins
cc: US EPA, Marshall Hyatt
WSRO-Surface Water Protection
NPDES File
Central Files
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
Location: 512 N. Salisbury St Raleigh, North Carolina 27604
Phone: [phone] FAX: [phone]Customer Service: 1-877-623-6748
Internet: www.ncwaterquality.org
An Equal Opportunity 1 Affirmative Action Employer
Nose Carolina
�tutnlly

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 IV hereof.
The permit shall become effective August 1, 2009.
This permit and the authorization to discharge shall expire at midnight on April 30, 2014
Signed this day July 10, 2009.
Coleen H. Sullins, Director
Division of Water Quality
By Authority of the Environmental Management Commission

Permit NC0055786
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby revoked. As of this
permit issuance, any previously issued permit bearing this number is no longer effective. Therefore, the exclusive
authority to operate and discharge from this facility arises under the permit conditions, requirements, terms, and
provisions included herein.
The City of Lexington
is hereby authorized to:
1. Continue to operate the existing 6.5 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, anaerobic dugesters, sludge drying beds; 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°46'0G"
Longitude: 80°14'14"
Stream Class: WS-V & B
Subbasin: 30707
Receiving Stream: Abbotts Creek
NC0055786
Lexington Regional
WWTP
North.
SCALE 1:24000

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 is
authorized to discharge treated wastewater from Outfall 001 subject to the following effluent limitations and
monitoring requirements:
.
EFFLUENT LIMITATIONS
MONITORING REQUIREMENTS
PARAMETER
Monthly
Average
Weekly
- Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample
Location (1)
Flow
6.5 MGD
Continuous
Recording
I or E
BOD, 5-day, 20°C (2) (Apr 1- Oct 31)
(Nov 1- Mar 31)
5.0 mg/L
10.0 mg/L
7.5 mg/L
15.0 mg/L
Daily
Composite
I, E
Total Suspended Solids (2)
30.0 mg/L
45.0 mg/L
Daily
Composite
I, E
NH3-N, mg/L (Apr 1- Oct 31)
(Nov 1- Mar 31)
1.0 mg/L
2.0 mg/L
3.0 mg/L
6.0 mg/L
Daily
Composite
E
Fecal Coliform (geometric mean)
200/100 mL
400/100 mL
Daily
Grab
E
Dissolved Oxygen
Daily average shall not be less than 6.0 mg/L
Daily •
Grab
E
pH •
> 6.0 and < 9.0 standard units at all times
Daily
Grab
. E
Temperature, °C
Daily
Grab
E
Conductivity, umhos/cm
Daily
Grab
E
Total Residual Chlorine)
28 pg/L
Daily
Grab
E
Total Phosphorus (4) (Apr 1- Oct 31)
(Nov 1- Mar 31)
4,910
Monitor (mg/L)
founds seasonal total
(mg/L)
seasonal total
Weekly
Seasonally
Weekly
Seasonally
Composite
Calculated
Composite
Calculated
E
E
-Monitor
L 6,930pounds
'Total Cadmium (pg/L)
3.0 pg/L
Weekly
Composite
E
/fotal Lead (pg/L)
34.0 pg/L _
Weekly
Composite
LE
Total Mercury (pg/L)
2/Month
Composite
k
/Total Nickel ' (pg/L)
2/Month
Composite
E
'Phenols (pg/L)
2.8 pg/L
2/Month
Grab
E
'selenium (pg/L)
8.0 pg/L
56.0 pg/L
Weekly
Composite
E
Total Chromium (pg/L)
Monthly
Composite
E
-Total Copper (pg/L)
Monthly
Composite
E
'Total Zinc (pg/L)
Monthly
Composite
E
Total Nitrogen (mg/L)
Monthly
Composite
E
-Total Silver (pg/L)
Quarterly
Composite
E
Chronic Toxicity
Ceriodaphnia, P/F @60% (5)
Quarterly
Composite
E
Pollutant Scan
See A. (6.)
Annually
A . (6.)
E
There shall be no discharge of floating solids or visible foam in other than trace amounts.
Footnotes:
(1) .Sample locations: I - Influent, E - Effluent
(2) The monthly average effluent BODS and Total Suspended Solids concentrations shall not exceed 15% of the respective influent values.
(3)
The facility shall report all effluent TRC values reported by a NC certified laboratory including field certified. However, effluent values
below 50 µg/L will be treated as zero for compliance purposes.
(4) Monitoring and effluent limitations for Total Phosphorus shall be conducted and calculated as prescribed above and in Condition A. (3.) of
this permit.
Chronic Toxicity (Ceriodaphnia), February, May, August, and November; see A. (4.).
(5)

Permit NC0055786
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 41}
LOCATION
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 Pertnittee shall calculate the seasonal mass loading of total phosphorus as the sum of monthly loadings,
according to the following equations:
(a) Monthly Mass Loading (pounds/month) = 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/month)
8.34 = conversion factor, from (mg/L X MG) to pounds
(b) Seasonal Mass Loading (pounds/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-rnonitoring 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 60.0%.
The permit holder shall perform at a minimum, quarterly monitoring using test procedures outlined in the
"North Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised February 1998, or subsequent
versions or "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised -February
1998) or subsequent versions. The tests will be performed during the months of February, May, August
and November. Effluent sampling for this testing shall be performed at the NPDES permitted final
effluent discharge below all treatment processes.
If the test procedure performed as the first test of any single quarter results in a failure or ChV below the
permit limit, then multiple -concentration testing shall be performed at a minimum, in each of the two
following months as described in "North Carolina Phase II Chronic Whole Effluent Toxicity Test
Procedure" (Revised -February 1998) or subsequent versions.
The chronic value for multiple concentration tests will be determined using the geometric mean of the
highest concentration having no detectable impairment of reproduction or survival and the lowest
concentration that does have a detectable impairment of reproduction or survival. The definition of
"detectable impairment," collection methods, exposure regimes, and further statistical methods are specified
in the "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised -February 1998)
or subsequent versions.
All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge
Monitoring Form (MR-1) for the months in which tests were performed, using the parameter code TGP3B
for the pass/fail results and THP3B for the Chronic Value. Additionally, DWQ Form AT-3 (original) is to
be sent to the following address:
Attention: NC DENR / DWQ / Environmental Sciences Section
1621 Mail Service Center
Raleigh, North Carolina 27699-1621

Permit NC0055786.
Completed Aquatic Toxicity Test Forms shall be filed with the Environmental Sciences Branch no later
than 30 days after the end of the reporting period for which the report is made.
Test data shall be complete, accurate, include all supporting chemical/physical measurements and all
concentration/response data, and be certified by laboratory supervisor and ORC or approved designate
signature. Total residual chlorine of the effluent toxicity sample must be measured and reported if chlorine
is employed for disinfection of the waste stream.
Should there be no discharge of flow from 'the facility during a month in which toxicity monitoring is
required, the permittee will complete the information located at the top of the aquatic toxicity (AT) test
form indicating the facility name, permit number, pipe number, county, and the month/year of the report
with the notation of "No Flow" in the comment area of the form. The report shall be submitted to the
Environmental Sciences Branch at the address cited above.
Should the permittee fail to monitor during a month in which toxicity monitoring is required, monitoring
will be required during the following month.
Should any test data from this monitoring requirement or tests performed by the North Carolina Division
of Water Quality indicate potential impacts to the receiving stream, this permit may be re -opened and
modified to include alternate monitoring requirements or limits.
If the Permittee monitors any pollutant more frequently then required by this permit, the results of such
monitoring shall be included in the calculation & reporting of the data submitted on the DMR & all AT
Forms submitted.
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.

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

Fact Sheet - NPDES Permit
City of Lexington
NPDES No. NC0055786
Facility
Receiving Stream
Facility Name:
Receiving Stream:
Abbotts Creek
Lexington WWTP
Permitted Flow (MGD):
6.5
Subbasin:
030707
Facility Class:
IV
Index No.:
12-119-(6)
Facility Status:
Existing
Stream Class:
WS-V and B
Permit Status:
Existing
303(d) Listed:
Yes
County:
Davidson
Use Support:
Impaired (biological)
Regional Office:
Winston-Salem
Drainage Area (mi2):
182
USGS Topo Quad:
D18SW
Summer 7Q10 (cfs)
6.7
(Lexington East)
Winter 7010 (cfs):
15
30Q2 (cfs):
18
Average Flow (cfs):
167
IWC (%):
56
FACILITY OVERVIEW
The City of Lexington owns and operates a 6.5 MGD, activated sludge wastewater treatment plant
that serves 22,000 people. 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 indude three Significant Industrial Users, two of which are Categorical
Industrial Users. The permit will continue to require the City to implement its pretreatment
program.
INSTREAM MONITORING
The Lexington WWTP discharges treated municipal wastewater to the Abbotts Creek, a Class WS-V
and B water in the Yadkin -Pee Dee River basin. The Division rates Abbotts Creek as Impaired,
based on the assessment of the biological indicators.
Instream monitoring is required for temperature, dissolved oxygen, fecal coliform, conductivity,
total phosphorus, TKN, ammonia nitrogen, nitrate + nitrite nitrogen, and chlorophyll -a. The
Permittee is provisionally exempted from the instream monitoring requirements based on the
participation in the Yadkin Pee -Dee Monitoring Coalition.

Permit NC0055786
TOXICITY TESTING
Type of Toxicity Test: Chronic P/F
Existing Limit: 001: Chronic P/F @ 60%
Recommended Limit: 001: Chronic P/F @ 60%
Monitoring Schedule: February, May, August, November
The facility has been consistently passing it's WET test during the review period (2005 through
2008).
COMPLIANCE HISTORY
The City had a mixed compliance record during the review period (2005 through 2008). The
following Notices of Violation (NOV) were issued: 09/05/07 — phenols, 06/12/07 — phenols,
04/19/07 — phenols, 12/17/06 — pH, 12/16/06 — phenols, 12/30/06 — phenols, 12/22/06 —
phenols, 12/29/06 — phenols, 11/07/06 — phenols, 09/26/05 — phenols, 03/09/05 - phenols. It
was determined that one of the industries was releasing batches of phenol containing waste to the
WWTP. This issue was addressed through the pretreatment program.
Compliance Evaluation Inspection conducted on 11/13/08 determined that the facility is well
maintained and operated.
REASONABLE POTENTIAL ANALYSIS
Reasonable potential analysis was conducted for: Ag, As, Cd, Cu, Cr, Phenol, Hg, Ni, Pb, Se, Mo,
and Zn (see attached).
PROPOSED CHANGES:
• Limits: Based on the Reasonable Potential Analysis, limits are being introduced for Pb, Se,
and Cd. Limit for Hg will be removed.
• Monitoring: Monitoring for Pb, and Cd will be increased to weekly due to the introduction of the
limits. A weekly monitoring for Se will be added to the permit.
PROPOSED SCHEDULE FOR PERMIT ISSUANCE:
Draft Permit to Public Notice: April 21, 2009 (est.)
Permit Scheduled to Issue: June 14, 2009 (est)
STATE CONTACT:
If you have any questions on any of the above information or on the attached permit, please contact
Sergei Chernikov at [phone].
REGIONAL OFFICE COMMENT:

REASONABLE POTENTIAL ANALYSIS
Lexington Regional WWTP
NC0055786
Time Period 2007-2008
Qw (MGD) 6.5
7Q10S (cfs) 6.7
7Q10W (cfs) 15
3002 (cfs) 18
Avg. Stream Flow, QA (cfs) 167
Recwing Stream Abbnots Creek
WWTP Class IV
IWC (%) Qv 7Q10S 60.06
© 7Q10W 40.179
@ 3002 35.886
@ QA 5.6897
Stream Class WS V, B
Outfall 001
Qw = 6.5 MGD
PARAMETER
TYPE
(1)
STANDARDS &
CRITERIA (2)
POL
Units
REASONABLE POTENTIAL RESULTS
RECOMMENDED ACTION
NC WQS/
Chronic
%FAY/
Acute
n
# Det Alai Prod Cw Allowable Cw
Arsenic
C
50
uglL
12
1
498.6
Acute: N/A
_ _--__ __
Chronic: 879
no limit
—_— __-------_---_-- --- ---- — —
Cadmium
NC
2
15
ug/L
31
5
8.8
Acute: 15
_ _ _--- --
Chronic: 3_
addfimtt---------_—_-- -- -
— — - - —
Chromium
NC
50
1,022
ug/L
41
0
14.8
Acute: 1,022
_ C_ __-- -
hronic: 83 —
no limit
—__— ----------_ -- —_—
- -7- —
Copper
NC
7
AL
7.3
ug/L
41
10
54.5
Acute: 7
_ _ __—_ _
Chronic: 12
no limit
—_— .-------------_—_—_—_—. —
action level standard
Lead
NC
25
N
33.8
uglL
41
3
55.1
Acute: 34
ron--_
Chic: 42
add limit ------------_-- _—_
--- — —
Mercury
NC
12
2.0000
nglL
26
15
12.8742
Acute: N/A
_— _-
Chronic: 20
remove the limit ----------_--_----_—_
-
Molybdenum
A
3,500
ug/L
12
1
24.9
Acute: N/A
_ on _ 9,753 _-
Chr-
ic:
no limit'
— _--------------_—_—: — — --
Nickel
NC
88
261
ug/L
42
1
18.0
Acute: 261
_ _ _.—__ __
Chronic: 147
no limit
--- _----_ — — --- — — -- -- •___— - _ -
Phenols
A
1
N
ug/L
30
2
4.4
Acute: N/A
_ --
Chronic: _---3
keep the limit
__ __—_ _
- — — — --- — —• — ----
Selenium
NC
5.0
56
ug/L
.
12
3
83.5
Acute: 56
Chronic: 8
add the knit --_--- - _
- — - — - — -
Silver
NC
0.06
AL
1.23
ug/L
13
0
34.1
Acute: 1
____________
Chronk: 0
no limit
—_--__--_--_-_—_---- _
- — —
action level standard _
Zinc
NC
50
AL
67
ug/L
30
18
290.0
Acute: 61
Chronic: 83
no limit .. ' _
action level standard - — — — -- --- —
• Legend:
C = Carclnogenlc
NC = Non -carcinogenic
A = Aesthetic
"Freshwater Discharge
55786-RPA-2009.xls, rpa
4/15/2009

REASONABLE POTENTIAL ANALYSIS
Arsenic
Date Data BDL=112DL Results
1 . < 10.0 5.0 Std Dev. 15.7328
2 ' < 10.0 5.0 Mean 9.5417
3 < 10.0 5.0 C.V. 1.6489
4 < 10.0 5.0 n 12
5 <;, 10.0 5.0
6 <; 10.0 5.0 Mull Factor = 8.3800
7 Jul-2008 ..i 59.5 59.5 Max. Value 59.5 ug/L
8 <!' 10.0 5.0 Max. Pred Cw 498.6 ug/L
9 <' 10.0 5.0
10 <;., 10.0 5.0
11 <' 10.0 5.0
12 <% 10.0 5.0
13
14
15
16
17
18
19
20
21
22
23
24
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
199
2r^
-1-
55786-RPA-2009.xls, data
4/13/2009

REASONABLE POTENTIAL ANALYSIS
Cadmium
Chromium
Date
1
2
3
4
5
6
7
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
199
200
Data
'
•
<i
BDL=1/2DL
2 1.0
2 1.0
2 1.0
2 1.0
2 1.0
4.25 4.3
2 1.0
2 1.0
2 1.00
2 1.00
2 1.00
2 1.00
2 1.00
2 1.00
2 1.00
3 3.30
3 2.60
3 2.70
2 1.00
2 1.00
2 1.00
2 1.00
2 1.00
2 1.00
2 1.00
2 1.00
2.0 1.00
2 1.00
2.0 1.00
3 _ 3.40
2 1.00
Results
Std Dev.
Mean
C.V.
n
Mult Factor =
Max. Value
Max. Pred Cw
0.8752
1.3629
0.6422
31
2.0700
4.3 ug/L
8.8 ug/L
Date
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24-
25
26 < 20 10.0
27 < 5.0 2.5
28 <. 20 10.0
29 < 20 10.0
30 < 5.0 2.5
31 < 20 10.0
32 < 20 10.0
33 5,0 _ _ 2.5
Q4 cU 1U.0
35 < 20 10.0
36 < 20 10.0
37 < 5.0 2.5
38 < 20 10.0
39 < 20 10.0
40 < 20 10.0
41 < 20 10.0
42 _
43
44
45
46
47
48
49
50
51
52
53
54
5
56
58
53
19S
200
Data
BDL=1/20L Results
5 2.5 Std Dev. 3.0506
20 10.0 Mean 8.1098
< 20 10.0 C.V. 0.3762
<, 20 10.0 n 41
<20 10.0
<- 5 2.5
<: 20 10.0
< 20 10.0
< 10.0 5.0
<, 5.0 2.5
<; 20 10.0
< 20 10.0
v < 10.0 5.0
<I 20 10.0
<- 20 10.0
< 10 5.0
<. 20 10.0
<: 20 10.0
< 10 5.0
< 20 10.0
< 20 10.0
< 10 5.0
<; 20 10.0
10.0
< 20 10.0
Mult Factor = 1.4800
Max. Value 10.0 ug/L
Max. Pred Cw 14.8 ug/L
-2-
55786-RPA-2009.xls, data
4/13/2009

REASONABLE POTENTIAL ANALYSIS
Copper
Lead
Date
Data BDL=1/2DL
Results
Date
Data
BDL=1/2DL
Results
1
«:
= 4 12.7 12.7
Std Dev.
8.4664
1
19.9 19.9
Std Dev.
4.8328
2
C 20.0 10.0
,
Mean
15.6273
2
<
20 10.0
Mean
9.9098
3
,r<,
4A 20.0 10.0
C.V.
0.5418
3
<
20 10.0
C.V.
0.4877
4
20.0 10.0
n
41
4
<
20 10.0
n
41
5
l 20.0 10.0
5
<
20 10.0
6
13.3 13.3
Mult Factor
1.7300
6
18 18.0
MuIt Factor=
1.6500
7
20.0. 10.0
Max. Value
31.5 ug/L
7
33.4 33.4
Max. Value
33.4 ug/L
8
20.0 10.0
Max. Pred Cw
54.5 ug/L
8
<
20 10.0
Max. Pred Cw
55.1 ug/L
9
:4 6.0 6.0
9
<
10 5.0
10
<10A 5.0
10
<
20 10.0
11
< 20.0 10.0
11
<
20 10.0
12
, 24.2 24.2
12
<.
10 5.0
13
8.4 8.4
13
<
20 10.0
14
< 20.0 10.0
14
<
20 10.0
15
31.5 31.5
15
<
10 5.0
16
8.1 8.1
16
<
20 10.0
17
<. 20.0 10.0
17
<
20 10.0
18
< 20.0 10.0
18
<
10 5.0
19
16.3 16.3
19
<
20 10.0
20
< 20.0 10.0
20
<
20 10.0
21
25.4 25.4
21
<
10 5.0
22
< 2.0 1.0
22
<
20 10.0
23
< 20.0 10.0
23
<
20 10.0
24
< 20.0 10.0
24
<
20 10.0
25
< 50.0 25.0
25
<
20 10.0
26
< 50.0 25.0
26
<
10 5.0
27
< 10.0 5.0
27
<
20 10.0
28
< 50.0 25.0
28
<
20 10.0
29
< 50.0 25.0
29
<
10 5.0
30
< 10.0 5.0
30
<
20 10.0
31
< 50.0 25.0
31
<
20 10.0
32
< 50.0 25.0
32
<
10 5.0
33
< 10.0 5.0
33
<
20 10.0
34
< 50.0 25.0
34
<
20 10.0
35
< 50.0 25.0
35
<
20 10.0
36
< 50.0 25.0
36
<
20 10.0
37
< 50.0 25.0
37
<
10 5.0
38
18.8 18.8
38
<
20 10.0
39
<i 50 25.0
39
<
20 10.0
40
<a 50 25.0
40
<
20 10.0
41
z 50 25.0
41
.
<
20 10.0
42
42
43
43
44
44
45
45
46
46
47
47
48
48
49
49
50
50
51
51
52.
52
53
53
54
54
55
55
,.
56
56
57
57
58
58
i
59
59
60
60
199
199
200
200
- 3 -
55786-RPA-2009.xls, data
4/13/2009

REASONABLE POTENTIAL ANALYSIS
Mercury
Molybdenum
1
2
3
4
5
6
7
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
199
200
Date
Data
<:
' <
, <t
1
<
<
<-
<
<
<
<
<
-
.
k''-
•199
1.00
1.00
1.00
1.00
1.00
2.00
1.00
4.80
1.20
3.10
1.90
1.00
1.40
1.00
1.00
1.00
2.40
1.70
4.99
1.20
2.72
1.26
4.59
1.74
1.00
1.00
BDL=1/2DL
1.0
1.0
1.0
1.0
1.0
1.0
1.0
4.8
1.0
3.1
1.0
1.0
1.0
1.0
1.0
1.0
2.4
1.0
5.0
1.0
2.7
1.0
4.6
1.0
1.0
1.0
Results
Std Dev.
Mean
C.V.
n
Mult Factor
Max. Value
Max. Pred Cw
1.2958
1.6385
0.7909
26
2.58
5.0 ng/L
12.9 ng/L
1
2
3
4
5
6
7
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
200
Date
Data
<.
<
<
'<,
<
<
<.
<
<.,
<
<
<R,
3 .
`
`.,
•
10
10
10
10
10
12.6
10
20
20
20.0
20.0
20.0
BDL=1/2DL
5.0
5.0
5.0
5.0
5.0
12.6
5.0
10.0
10.0
10.0
10.0
10.0
-
Results
Sid Dev.
Mean
C.V.
n
Mult Factor=
Max. Value
Max. Pred Cw
2.93
7.72
0.38
12
1.9800
12.6 ug/L
24.9 ug/L
-4-
55786-RPA-2009.xls. data
4/13/2009

REASONABLE POTENTIAL ANALYSIS
Nickel
Phenols
1
2
3
4
5
6
7
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
199
200
Date
Data
<'
<,
<
. <,
<'
1 <;
<'
<
, <.
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
• <
<
<
<:
<
<.
<
'. <:
<'
i
10
20
20
20
20
13.6
20
20
10
10
20
20
10
20
20
10
20
20
10
20
20
10
20
20
20
20
10.0
20
20
10
20
20
10.0
20
20
20
20
10
20
20
20
20
BDL=1/2DL
5.0
10.0
10.0
10.0
10.0
13.6
10.0
10.0
5.0
5.0
10.0
10.0
5.0
10.0
10.0
5.0
10.0
10.0
5.0
10.0
10.0
5.0
10.0
10.0
10.0
10.0
5.0
10.0
10.0
5.0
10.0
10.0
5.0
10.0
10.0
.10.0
10.0
5.0
10.0
10.0
10.0
10.0
Results
Std Dev.
Mean
C.V.
n
Mull Factor =
Max. Value
Max. Pred Cw
2.3429
8.7762
0.2670
42
1.3200
13.6 ug/L
18.0 uglL
1
2
3
4
5
6
7
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
199
200
Date
Data
, <
' <a
L
i .. '
4`<'
i <;
;..<j
: <;
' <
<
<
<.
<'.
<
<
. <;
• <'
<
' <'
<
<.
<'
<
<
<.
<.
<"'
<''
,<a
2
2
2
2.85
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
BDL=1/2DL
1.0
1.0
2.0
2.9
1.0
1.0
1.0
1.0
1.0
. 1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
Results
Sid Dev.
Mean
C.V.
n
Mult Factor =
Max. Value
Max. Pred Cw
0.3784
1.0950
0.3455
30
1.5300
2.9 ug/L
4.4 ug/L
55786-RPA-2009.xls, data
4/13/2009

REASONABLE POTENTIAL ANALYSIS
Selenium
Silver
1
2
3
4
5
6
7
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
199
200
Date
Data
c
t
E
1
f
F:
1°
,ts
�1
:'.<,
.,
k)1
10
10
10
10
10
10
10
23
20
10
10.0
10
BDL=1/2DL
5.0
5.0
5.0
5.0
5.0
5.0
5.0
23.0
20.3
5.0
5.0
10.4
Results
Std Dev.
Mean
C.V.
n
Mult Factor =
Max. Value
Max. Pred Cw
6.4838
8.2250
0.7883
12
3.6300
23.0 ug/L
83.5 ug/L
1
2
3
4
5
6
7
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
199
200
Date
Data
• <
<
<'
<..
,c.
,< ;
. <=
. <,
<'
<.
<
`<,
<.
5
5
5
5
5
5
5
5
5
5
20
20
5
BDL=1/2DL
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
10.0
10.0
2.5
Results
Std Dev.
Mean
C.V.
n
Mult Factor =
Max. Value
Max. Pred Cw
2.8165
3.6538
0.7708
13
3.4100
10.0 ug/L
34.1 ug/L
-6-
55786-RPA-2009.xls, data
4/13/2009

REASONABLE POTENTIAL ANALYSIS
Zinc
Date Data 13DL=112DL Results
1 47.4 47.4 Std Dev. 32.2475
2 35.2 35.2 Mean 49.8633
3 63.8 63.8 C.V. 0.6467
4 55.8 55.8 n 30
5 52.8 52.8
6 20 10.0 Mult Factor = 2.1000
7 52.8 52.8 Max. Value 138.1 ug/L
8 107.8 107.8 Max. Pred Cw 290.0 uglL
9 R, ` 52.9 52.9
10 103.4 103.4
11 138.1 138.1
12 98.9 98.9
13�" 57.3 57.3
14 r'a 86.9 86.9
15 58.6 58.6
16 21.2 21.2
17 "77aft 53.5 53.5
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
199
200
50.0 25.0
50.0 25.0
10.0 5.0
''-3 80.7 80.7
<' 50.0 25.0
<. 50.0 25.0
<. 50.0 25.0
< 50.0 25.0
< 50.0 25.0
63.8 63.8
<` 50 25.0
50 25.0
50 25.0
- 7 -
55786-RPA-2009.xls, data
4/13/2009

MEMORANDUM
To:
January 27, 2009
Lee Spencer, Regional Engineer
NC DENR / DEH / Public Water Supply Section
Winston Salem Regional Office
RECEIVED
N c' Deot of ENR
APR 2 4 2009
From: Sergei Chernikov, Environmental Engineer II, NPDES-West,
Division of Water Quality (fax-919-807-6495)
Subject: Review of the discharge locations for the following:
Lexington Regional WWTP
NC0055786
Davidson County
Winston-Salem
Regional Office
Please indicate below by May 22, 2009 your agency's position or viewpoint on the facility
listed above. We cannot issue the permit without your concurrence. Please return this form
at your earliest convenience.
RESPONSE:
Signed
cc: file
This agency has reviewed the draft permit and determined that the proposed
discharge will not be sufficiently close to any existing or known proposed
public water supply intake so as to create an adverse effect on water quality.
We concur 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.
Concurs with issuance of the above permit, provided the following conditions
are met:
Opposes the issuance of the above permit, based on reasons stated below, or
attached:

Chernikov, Sergei
From: [e-mail]
Sent: Tuesday, May 05, 2009 1:58 PM
To: [e-mail]
Subject: NC0055786, Lexington WWTP
EPA has no comments on this draft permit.
1

Winston-Salem Journal
Advertising Affidavit
NCDENR/DWQ/SURFACE WATER PROTE
ATTN: JOVONAH D. WEEDEN
1617 MAIL SERVICE CENTER
RALEIGH, NC 27699-1617
Date Category
04/24/2009
Legal Notices
Winston-Salem Journal
P.O Box 3159
Winston-Salem, NC 27102
RECENE
CTION
Account Number
3425332
Date
Description
PUBLIC NOTICE North Carolina Environmeri
4, 2009
M 2.820d9
WATER °�
�NR Q2ANCH
ovSQu E
2 x 61 L
Total Cost
417.83
PUBLIC NOTICE
North Carolina Environmental
Management Commission/NPDES Unit
1617 Mall Service Center
Raleigh, NC 27699.1617
Notice of Intent to Issue a
NPDES Wastewater Permit
The North Carolina Environmental Management
Commission proposes to issue a NPDES wastewater
discharge permit to the person(s) listed below.
Written comments regarding the proposed permit
will be accepted until 30 days after the publish date
of this notice. The Director of the NC Division of
Water Quality (DWQ) may hold a public hearing
should there be a significant degree of public Inter-
est. Please mall comments and/or information re-
quests to DWQ at the above address. Interested
persons may visit the DWQ at 512 N. Salisbury
Street, Raleigh, NC to review information on file.
Additional information on NPDES permits and this
notice may be found on our website: www.ncwater-
quality.org, or by calling [phone].
Alcatel -Lucent USA requested renewal of permit
NC0080853 for Salem Business Park [gw remedia-
tion] in Forsyth County. This facility discharges
remediated groundwater to Salem Creek in the
Yadkin -Pee Dee River Basin. Currently total sus-
pended solids and tetrachioroethene are water
quality limited.
The Davie County Water System requested renewal
of permit NC0024872 for Cooleemee WWTP In Davie
County; this permitted discharge Is treated municl-
pal wastewater to South Yadkin River, Yadkin River
Basin.
The City of Lexington requested renewal of permit
NC0055786 for Lexington Regional WWTP In David-
son County: this permitted discharge Is treated mu-
nicipal wastewater to Abbotts Creek, Yadkin River
Basin.
The City of Thomasville requested renewal of per-
mit NC0024112 for Hamby Creek WWTP in Davidson
County; this permitted discharge is treated mu-
nicipal wastewater to Hamby Creek, Yadkin River
Basin.
The Town of Denton requested renewal of NPDES
permit NC0082949 for the Denton Water Treatment
Plant In Davidson County; this permitted discharge
Is treated filter backwash wastewater to an un-
named tributary to the Yadkin River in the Yadkln-
Pee Dee River Basin.
WSJ: April 24, 2009
Media General Operations, Inc.
Publisher of the
Winston-Salem Journal
Forsyth County
Before the undersigned, a Notary Public of Forsyth County, North Carolina, duly
commissioned, qualified, and authorized by law to administer oaths, personally appeared
D.H. Stanfield, who by being duly sworn deposes and says: that he is Controller of the
Winston-Salem Journal, engaged in the publishing of a newspaper known as Winston-Salem
Journal, published, issued and entered as second class mail in the City of Winston-Salem, in
said County and State: that he is authorized to make this affidavit and sworn statement: that
the notice or other legal advertisement, a true copy of which is attached hereto, was
published in the Winston-Salem Journal on the following dates:
04/24/2009
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 24th day of April, 2009
(signature of person mal<' davit)
Sworn to and subscribed before me, this 24th day of April, 2009
My Commission expires I
(
f
N. arxpuyic)_��_��`�
KIMALEY JOHNSON
NOTARY PUBLIC
FORSYTH COUNTY
STATE OF NORTH CARMA
MY COMMISSION EXPIRES- La/D
THIS IS NOT A BILL. PLEASE PAY FROM INVOICE. THANK YOU

THE CITY OF
NORTH
Water Resources Department
28 W. Center Street
Lexington, NC 27292
October 28, 2008
LEXINGTON
CAROLINA
"Serving The Community Since 1828"
Mrs. Dina Sprinkle
NCDENR/DWQ/Point Source Branch
1617 Mail Service Center
Raleigh, NC 27699-1617
Subject: NPDES Permit — NC0055786
Lexington Regional WWTP
Davidson County
Application for Permit Renewal
Dear Mrs. Sprinkle:
Telephone [phone]
Fax [phone]
`4 .
By this letter and attachments, I am requesting renewal of the NPDES permit for the City
of Lexington's Regional WWTP — NC0055786.
Attached are the following:
EPA Form 2A
Designation of authority form
Sludge Management Plan: The City disposes of the sludge generated at this facility
through its Compost Facility — WQ0001318.
Please forward comments and questions to my attention at 336-248-3970 or to
[e-mail].
Sincerely
Roger Spach,
Water Resources Superintendent
cc: Rick Comer, City of Lexington
Jennifer Carter, WSRO