NC0024333_Regional Office Historical File Pre 2018

NCDENR
North Carolina Department of Einvironment and Natural Rest urces
Division of Water Quality
col 9,171. Sullins
December 12, 2011
Mr. Kyle Ketchum
City of Monroe
Post Office Box 69
Monroe, NC 28111
Subject; Toxicity Test Results
Monroe WWTP
NPDES Permit No, NC0024333
Union County
Dear Mr, Ketchum:
Dee Freeman
SecretaD,
Enclosed is a copy of the toxicity test results relative to the inspection conducted at the subject
facility on October 18 and 20, 2011 by John Lesley of this Office. Whole effluent samples were collected
for use in a chronic pass/fail toxicity test, The test utilizing these samples resulted in a pass.
The report should be self-explanatory; however, should you have any questions concerning this
report, please do not hesitate to contact Mr. Lesley or me at [phone].
Sincerely,
Robert B. Krebs
Regional Supervisor
Surface Water Protection
Enclosure
cc; Central Files
Susan Meadows, Aquatic Toxicology Unit
W4aiting Address
61E! East Center Avenue, Suite 301
Mooresville, NC 2811,5
Phone [phone]
Fax [phone]
Foca tiurt
6 I East Center Avenue, Suite 30
Mooresville, North Carolina
Nu thCarolina
tura/fj
Internet: wyvyr,ncwa r'a mlal7 r".erg Customer Service 1 -87 7-623-6748
An E. 0undty!A9orrnatsve Action Employer _. 50% Recycled/1(1% Post Consumer Paper

NPDES Permit No. NC0024333
Page 2
Whole effluent samples were collected on October 18 and 20, 2011 by facility staff and DWQ
personnel for use in a chronic Ceriodaphnia dubia passifail toxicity test, Monroe WWTP has an effluent
discharge permitted at 10 4 MGD entering Richard Creek (7Q10 of 0.43 CFS). The test using these
samples resulted in a pass. Toxicity test information follows:
Test Type
Test Concentration
Test Result
Control Survival
Control Mean Reproduction
Test Treatment Survival
Treatment Mean Reproduction
First Sample pH
First Sample Conductivity
First Sample Total Residual Chlorine
Second Sample pH
Second Sample Conductivity
Second Sample Total Residual Chlorine
3-Brood Ceriodaphnia dubia pass/fail
90P/o sample
PASS
100%
26,6 neonates
100%
31.4 neonates
7 01 SU
874 micromhos/cm
<0 1 mgll
6.98 SU
653 micromhos/cm
<0.1 mg/I
Test results for these samples indicate that the effluent would not be predicted to have water
quality impacts on the receiving stream.

/ec. /b • 31-//
JL
Division of Water Quality
October 28, 2011
MEMORANDUM
To: Rob Krebs
Surface Water Protection, MRO
Through:
From:
Subject:
Cindy A. Moore
Supervisor, Aquatic Toxicology Unit
Carol Hollenkamp �i
Quality Assurance Of`.icer, Aquatic Toxicology Unit
Whole effluent toxicity test results
Monroe WWTP
NPDES Permit # NC0024333/001
Union County
The aquatic toxicity test using 24-hour flow proportional composite samples of effluent discharged from
Monroe WWTP has been completed. Monroe WWTP has an effluent discharge permitted that is 10.4
million gallons per day (MGD) entering Richardson Creek (7Q10 of 0.43 CFS). Whole effluent samples
were collected on October 18 and October 20 by John Lesley and a facility representative for use in a
chronic Ceriodaphnia dubia pass -fail toxicity test. The test using these samples resulted in a pass. Toxicity
test information follows.
Test Type
Test Concentrations
Test Result
Control Survival
Control Mean Reproduction
Test Treatment Survival
Treatment Mean Reproduction
First Sample pH
First Sample Conductivity
First Sample Total Residual Chlorine
Second Sample pH
Second Sample Conductivity
Second Sample Total Residual Chlorine
3-Brood Ceriodaphnia dubia chronic pass fail
90%
Pass
100%
26.6 neonates
100%
31.4 neonates
7.01 SU
874 micromhos/cm
<0.10 mg/L
6.98 SU
653 micromhos/cm
<0.10 mg/L
Test results for the above samples indicate that the effluent would not be predicted to have water quality
impacts on receiving water. Please contact us if further effluent toxicity monitoring is desired. We may be
reached at [phone].
Basin: YAD14
cc:
Central Files
John Lesley, MRO
Aquatic Toxicology Unit Environmental. Sciences Section

Beverly Eaves Perdue
Governor
NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Coleen H. Sullins
Director
CERTIFIED MAIL: '7007 '1490 0.004 5537 9056
RETURN RECEIPT REQUESTED
Mr. Russell G. Colbath
Water Resources Director
City of Monroe
P.G. Box 69
Monroe, North Carolina 2811 '1-0069
SUBJECT:
Dear Mr. Colhath:
February 27, 2009
NOTICE OF VIOLATION
Whole Effluent Toxicity (WET) Testing
Copper and Zinc Action Level Policy
NPDES Permit No. NC0024333
Monroe WWTP
Union County
an
ary
This is to inforin you that a review of your toxicity sell -monitoring report form for the month of December 2008
indicates a violation of the toxicity limitation specified in your NPDES Permit. You should undertake necessary actions to
eliminate or reduce effluent toxicity to acceptable levels.
In addition, this correspondence contains important information on the Division's Copper and Zinc Action Level
Policy which is triggered by two or more toxicity limit violations that occur during the toxicity testing calendar quarter
specified by the toxicity testing special condition of your NPDES Permit. Attachments addressing policy implementation
and a copy of the Division's Toxicity Reduction Guidance have been included with this Notice of Violation.
You should initiate follow-up toxicity testing upon a single WET test failure which occurs during the toxicity
testing calendar quarter,
Your facility is currently monitoring for copper and/or zinc and the data indicate that the levels of copper/zinc in
your effluent have the potential to cause an exceedance of the NC water quality action level for this (these) parameter(s) in
your receiving strewn during low stream flow conditions. The policy states that whenever a facility experiences two or
more toxicity limit violations during a toxicity testing calendar quarter, the NPDES Permit will be modified to include
numeric limits for copper and/or zinc UNLESS the permittee provides one or more of the following:
Environmental Sciences Section
1621 Mail Service Center„ Raleigh, North Carolina 27699-1621
Location: 4401 Reedy Creek Ready Raleigh, North Carolina 27607
Phone: [phone]. FAX: [phone] 'S Customer Service: 1-877-623-674
Internet http:J'lh2c,enr.state,nc,usiesb!
One
North Caro iit.na
naturally
A,nEquitt p Action Employ

1. lnstream measurements of dissolved metal during low flow conditions that demonstrate compliance with
the Action Level standard
2. A revision of the prospective perm t limit using improved inputs that in concert with existing or
additional monitoring data demonstrats compliance with the Action Level standard
3. Toxicity Identification Evaluation VIE) results that definitively rule out copper andlor zinc as causes of
effluent toxicity
4. Demonstration by an alternative method approved by the Division and EPA that copper and/or zinc is not:
the cause of toxicity
The Division has evaluated your copper and/or zinc monitoring data. The Division has also developed a
prospective NPDES permit limit based on your facility's instream waste concentration, the copper and/or zinc action level
criterion and a translator procedure. Based on this data your prospective copper permit limit is 14.0 µg/L and your
prospective zinc permit limit is 114.0 in/L.
The per
quarter must eit
.e,. upon experiencing
provide DWQ with:
0 or tlasrre toxt
violations during a toxicity testing calendar
a) Written notification indicating acceptance of the prospective copper and/or zinc permit
limit. Notification is due within 30 days after the date of the second WET Notice of
Violation.
DR
b) Written notification indicating your choice of option(s) as noted on page one of this
correspondence. Notification is due within 30 days after the date of the second WET Notice of
Violation. DWQ approval of options 1-3 (previous page) is not necessary as the Division expects
work to rule out copper and/or zinc as causative effluenttoxicants to begin immediately upon the
second WET permit limit violation.
notification (a or b above) shall be sent to:
NC Division of Water Quality
Environmental Sciences Section
Aquatic Toxicology Unit
1621 Mail Service Center
Raleigh, NC 27699-1621
Please note that if you choose item b) above, you will he given nine months to submit documentation that
eliminates copper andlor zinc as causative effluent toxicants. Your final report should be comprehensive and include all
data used to support your conclusion(s). Should the data indicate copper andlor zinc as the source of effluent toxicity or if
Environmental Sciences Section
1621 Malt Service Center, Raleigh, North Carolina 27699-1621
Location: 44©1 Reedy Creek Road, Raiegha North Carolina 27607
Phone: 91.9-743 O 1 FAX: [phone] Customer Service: 1-87
Internet httpalfi2©.enr,state.nc.uslesbl'
On
e
NhCarolhna
Naturally
An Equal Opportenity 1 A6firnAcloon Employer

the data are inconclusive as to copper and/or zinc's role as a toxicity source, then the NPDES Permit will be reopened and.
the metal limits specified above will be applied to the permit. The report is due nine months after the date of the second
WET Notice of Violation.
Three copies of the final report shall be submitted to:
North Carolina Division of Water Quality
Environmental Sciences Section.
Aquatic Toxicology Unit
1621 Mail Service Center
Raleigh, North Carolina 27699-1621
You should consider submitting the above correspondence certified tail.
Failure to notify DWQ of youracceptance of a copper and/or zinc limit, failure to notify DWQ of your option
tion or failure to make acceptable demonstration to DWQ that copper and/or zinc are not causative effluent toxicants
the stated time frames will result in reopening of the NPDES Permit to include copper and/or zinc numeric
ions, as appropriate.
If the effluent is-toxic,.then we expect work to commence immediately with toxic effluent samples. Failure to
initiate work with toxic effluent samples during the study period is unacceptable and will be considered a failure to make
acceptable demonstration as cited above. We recommend a minimum of three separate sampling events during the nine
month period to definitively rule out copper and/or zinc as causative effluent toxicants.
Please note that your actions to notify DWQ of prospective limit acceptance or to notify DWQ of plan option(s)
and subsequent submission of a plan are contingent upon two or more toxicity NPDES permit limit violations occurring
during a toxicity testing calendar quarter.
Also note that the WET limit will remain in your NPDES permit regardless of whether metals are the source of
effluent toxicity. The data resulting front your actions to disprove copper and/or zinc as sources of effluent toxicity will
determine whether NPDES Permit limits will be assigned for these parameters. You are responsible for initiating actions
to address these issues.
You may consider entering into a Special Order by Consent (SOC) with .DWQ. .A SOC provides regulatory relief
for specific NPDES permit limit violations and, if signed, will contain a requirement to conduct a Toxicity Reduction
Evaluation. The SOC will contain a compliance schedule, stipulated penalties for failing to meet milestone activity dates
and may contain upfront penalties to settle past permit limit violations.
Environmental Sciences Section
1621 Mail Service Center, Raleigh, North Carolina 27699-1621
Location: 4401 Reedy Creek Road, Raleigh, North Carolina 27607
Phone: [phone] FAX: [phone] Customer Service 1-877-623.6748
Internet: http:l.T'h2o.enr.state,nc.usiesc/
One
NorthCaralirta
Naturally
An Epul Opportunity t Affirmative Action Employer

Additional information regarding the Division's Copper and Zinc Action Level Policy can be found at the
following web site - ht://www.esb.ermstate.nc.us, Click on the "Aquatic Toxicology" Unit and go to the prompt "AT
Downloadable Files" located at the bottom of the page. This web site also contains EPA's "Toxicity Reduction
Evaluation Guidance for Municipal Wastewater Treatment Plants." Section 4 of this document contains pertinent
information on. Toxicity Identification Evaluations.
If you have any questions concerning this correspondence, please contact Mr. John Giorgino at (9I9) 743-8441.
Sincerely,
Cindy Moore
Supervisor, Aquatic To
ATTACHMENTS
cc: Rob Krebs -Mooresville Regional Office (no attachments)
John Lesley -Mooresville Regional. Office (no attachments)
Vanessa. Manuel- Point Source Branch (no attachments)
ui
DWQ Surface
Marshall l-lyatt-USEPA Region IV, Atlanta Federal Center, 6l Forsyth St., SW, Atlanta, GA 30303
(no attachments)
Central Files (no attachments)
Aquatic Toxicology Unit Files (no attachments)
Environmental Sciences Section
1621 Mail Service Center, Raleigh, North Carolina 27699-1621
Location:4401 Reedy Creek Road, Raleigh: North Carolina 27697
Phone, 919-743-8400 FAX: [phone]l Customer Service, 1- 77-62,'167
intemet: http://h2oenr.state.nc.us/eset
One
North Carolina
Natlll'aIti
r pportunity 4 Affirmative Action Employer

OF W A rF Michael F. Easley, Govef l rn�a (j r
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
June 12, 2007
Mr. Russell Colbath
Water Resources Director
City of Monroe
Post Office Box 69
Monroe, North Carolina 28111
Subject: Toxicity Test Results
City of Monroe WWTP
NPDES Permit No. NC0024333
Union County, NC
Dear Mr. Colbath:
Alan W. Klimek, P.E. Director
Division of Water Quality
Enclosed is a copy of the toxicity test results relative to the inspection conducted at the
subject facility on May 15, 2007 by John Lesley of this Office. Effluent Samples were collected
on May 15 and 18, 2007 by Division stiff for use in a chronic pass/fail toxicity test. The test
utilizing these samples resulted in a pass.
The report should be self-explanatory; however, should you have any questions concerning
this report, please do not hesitate to contact Mr. Lesley or me at [phone].
Sincerely,
obert B. Krebs
Regional Supervisor
Surface Water Protection
Enclosure
cc: Central Files
Susan Meadows, Aquatic Toxicology Unit
Union County Health Department
AVA
NCDENR
N�o;t.h Carolina
,Naturally
Mooresville Regional Office Division of Water Quality Phone [phone] Customer Service
Internet: www.nescaterqualir orq 610 East Center Ave, Suite 301 Mooresville, NC 28115
Fax [phone]
An Equal Opportunity/Affirmative Action Employer— 50% Recycled/10% Post Consumer Paper

City of Monroe W -WTP
NPDES Permit No. NC0024333
Page 2
Whole effluent santgles were collected on May 1.5 and 18, 2007 by John Lesley for
chronic Ceriodaphnia dubia pa • fail toxicity test. City of Monroe WWTP has an effluent
discharge permitted at 10.4 MUD entering Richardson Creek (7Q10 of 0.43 CFS). The test using
these samples resulted in a pass. Toxicity test information follows:
Test Type
Test Concentration
Test Result
Control Survival
Control Mean Reproduction
Test Treatment Survival
Treatment Mean Reproduction
First Sample pH
First Sample Conductivity
First Sample Total Residual Chlorine
Second Sample pH
Second Sample Conductivity
Second Sample Total Residual Chlorine
Test results for these samples indicate
water quality impacts on the receiving stream..
3-Brood Ceriodaphnia dubia pass/fail
90.0% sample
Pass
100%©
27.4 neonates
1 00%
29.4 neonates
7.00 SU
882 rnicrarnhos/cm
<0.0052 mg/1
6.96 SU
978 micromhos/cm
<0.0052 mg/1
uld not be predicted to have
ke in a

Division of ""att Quality
May 2 1, 2007
To: Rob Krebs
Regional Supervisor, Surface "afer Protection, MRC)
Through: Cindy A. Moore
Supervisor, Aquatic #f"oxicol
Sandy Mort
Quality Assurance: Officer. Ac uatio "1"oxcology lw. nit
Subject: Whole effluent toxicity test result
Monroe W WTP
NPDES Permit 4 NC00243331001
Union County
The aquatic toxieita= to
WWTP has been comp
gallons per day (MG[))
sing 24-hour compos iples ofeftluent discharged from Monroe
ed. Monroe WWTP has an effluent discharge permitted at 10.4 million
ering Richardson Creek (7Q10 of 0.43 CI'S). Whole effluent samples
were collected on May 17 °tnd 18,, 2007 by MR0 personnel for use in a chronic C'eriodaphn:a
dubia pass/fail toxicity test. The test using these samples resulted in a pass. Toxicity test
information follows.
Test Type
Test Concentration
Test Result
Control Survival
Control Mean Reproduction
Test wl"rertratent Survival
Treatment Mean Reproduction
Fir t Sample pl.l
First Sample Conductivity
t Sample Total Residual Chlorine
Second Sample pH
Second Sample Conductivity
f Sample Total Residual Chlorine
3-Brood Ceriodaphnia
90.0''?l° sample
Pass
100'
27,1 neonates
1.00°r�r
29.4 neonates
7,00 SU
882 rnicronrhoslcm
<0...0052 mg,/1..,
6.96 SU
978 micromhos/cm
<0.0052 nit;/lam
ici pass/fail
Test results ltrr these sat pies inclic.ate. that the effluent would not be predicted to have water
quality irrrpacts on receiving water. Please contact us if further effluent toxicity monitoring is
desired. We may be reached at {9l9) 733-2136,
Basin: YAD 14
cc: Central Files
.John Leslie, MRO
Environ,n
a

CERTIFIED MAIL
RETURN RECEIPT REQUESTED
Mr. Kim Hinson
City of Monroe
PO Box 69
Monroe, North Carolina 28111
SUBJECT:
Dear Mr. Hinson:
Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
December 21, 2005
NOTICE OF VIOLATION
Whole Effluent Toxicity (WET) Testing
Copper and Zinc Action Level Policy
NPDES Permit No. NC0024333
City of Monroe WWTP
Union County
Alan W. Klimek, P.E., Director
Division of Water Quality
r,174.OLIRCES
..;;AL. OFFICE
DEC 2 7 200:
WATER Ecp
This is to inform you that a review of your toxicity self -monitoring report form for the month of October 2005
indicates a violation of the toxicity limitation specified in your NPDES Permit. You should undertake necessary.
actions to eliminate or reduce effluent toxicity to acceptable levels.
Previous correspondence was sent to you concerning implementation of the Division's Copper and Zinc
Action Level Policy. The correspondence included a prospective permit limits for copper and zinc and stated that the
trigger for implementing the policy would be two or more WET limit violations which occur during a toxicity testing
calendar quarter. Please note that the second WET limit violation has occurred and you must provide:
a) Written notification indicating acceptance of the prospective copper and zinc permit
limits. Notification is due by January 20, 2006.
OR
b) Written notification indicating your choice of option(s) 1-4 below. Notification is due by January 20,
2006. DWQ approval of options 1-3 below is not necessary as the Division expects work to rule out
copper and zinc as causative effluent toxicants to begin immediately upon the. second WET permit limit
violation that occurred during October 2005.
1. Instream measurements of dissolved metal during low flow conditions that demonstrate compliance
with the Action Level standard
2. A revision of the prospective permit limit using improved inputs that in concert with existing or
additional monitoring data demonstrates compliance with the Action Level standard
3. Toxicity Identification Evaluation (TIE) results that definitively rule out copper and zinc as causes of ,,
effluent toxicity o -
4. Demonstration by an alternative method approved by the Division and EPA that copper and zinc are
not causes of effluent toxicity
NNo Carolina
�tuta "
North Carolina Division of Water Quality 1621 Mail Service Center Raleigh, NC 27699-1621 Phone [phone] Customer Service
Internet www.esb.enr.state.nc.us 4401 Reedy Creek Rd. Raleigh, NC 27607 FAX [phone]
An Equal Opportunity/Affirmative Action Employer— 50% Recycledl10% Post Consumer Paper

Page 2
City of Monroe
December 21, 2005
Written notification a car b above) shall be sent to:
North Carol sion of Water Quality:
Environmental Sciences Section
Aquatic Toxicology Unit
1621 Mail Service, Center
Raleigh, North Carolina 2769-1T 21
Please note that if you choose item b) above, you will he given nine month: to submit documentation that
ninates copper and zinc as causative effluent toxicants. Your final report should he comprehensive and
lude all data used to support your conclusion. The report is due by September21, 2006,
Three copies of the final report shall be submitted to:
North Carolina Division of Water Quality
Environmental Sciences Section
Aquatic Toxicology Unit
1621 Mail Service Center
Raleigh, North Carolina 27699-1621
Failure to notify DWQ of your acceptance of copper and zinc limits, failure to notify DWQ of your
option selection or failure to make acceptable demonstration to DWQ that copper and zinc are not causative
effluent toxicants within the stated time frames will result in reopening of the NPDESPermit to include
numeric copper and zinc permit limitations, as appropriate.
If the elitethen we expect work to commence intrtaediatelt ra uent samples. Failure to
anitierte work with toxic e lttent .wimples during the studio period is unacceptable and will be considered alailure to
snake acceptable demonstrati teas cited abot°e. We recommend a minimum of three separate sampling events during
the nine month period to d fittz ved , rule out copper and zinc as causative (fluent toxicants.
Additional information regarding the Division's Copper and Zinc Action Level Polio; can be found at the
following web site - http://h2o.ens.state.nc.us/esblindex.htmla Click on the Aquatic Toxicology~' Unit and go to the
prompt "AT Downloadable. Files" located at the bottom of the page,
if you have any questions concerning this correspondence, please contact me or Mr. l evin Bowden at (919)
733-2136.
Sincerely,.
Matt Matthews
Aquatic Toxicology Unit Supervisor
cc: Rex Gleason-Mooresxille Regional Office
John Lesley -Mooresville Regional Office
Dawn Jeffries -Point Source Branch
Marshall Hyatt -Water Management Division, USEPA, Region. IV, 61 Forsyth St.., S •,�", Atlanta, CA 30303
Central Files
Aquatic Toxicology Unit Files

Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
November 15, 2005
CERTIFIED MAIL 7OD5'-Q 3j -ot'O$ 4757-613Y
RETURN RECEIPT REQUESTED
Mr. Kim Hinson
City of Monroe
PO Box 69
Monroe, North Carolina 28111
SUBJECT:
Dear Mr. Hinson:
NOTICE OF VIOLATION
Whole Effluent Toxicity (WET) Testing
Copper and Zinc Action Level Policy
NPDES Permit No. NC0024333
City of Monroe WWTP
Union County
Alan W. Klimek, P.E., Director
Division of Water Quality
ttcdtsEr= t. U"MViRONP?IEI.4
A;uD NATI'?P 1- RESOURCES
LJOGRESVII,T :. - ., �lAL OFF1Cg
f
NOV 1 6 200:)
WATER QI ITY SECT101
This is to inform you that a review of your toxicity self -monitoring report form for the month of September 2005
indicates a violation of the toxicity limitation specified in your NPDES Permit. You should undertake necessary actions to
eliminate or reduce effluent toxicity to acceptable levels.
In addition, this correspondence contains important information on the Division's Copper and Zinc Action Level
Policy which is triggered by two or more toxicity limit violations that occur during the toxicity testing calendar quarter
specified by the toxicity testing special condition of your NPDES Permit. Attachments addressing policy implementation
and a copy of the Division's Toxicity Reduction Guidance have been included with this Notice of Violation.
You should initiate follow-up toxicity testing upon a single WET test failure which occurs during the toxicity testing
calendar quarter.
Your facility is currently monitoring for copper and/or zinc and the data indicate that the levels of copper/zinc in
your effluent have the potential to cause an exceedance of the NC water quality action level for this (these) parameter(s) in
your receiving stream during low stream flow conditions. The policy states that whenever a facility experiences two or more
toxicity limit violations during a toxicity testing calendar quarter, the NPDES Permit will be modified to include numeric
limits for copper and/or zinc UNLESS the permittee provides one or more of the following:
1. Instream measurements of dissolved metal during low flow conditions that demonstrate compliance with
the Action Level standard
2. A revision of the prospective permit limit using improved inputs that in concert with existing or additional
monitoring data demonstrates compliance with the Action Level standard
3. Toxicity Identification Evaluation (TIE) results that definitively rule out copper and/or zinc as causes of
effluent toxicity
4. Demonstration by an alternative method approved by the Division and EPA that copper and/or zinc is not
the cause of toxicity
North Carolina Division of Water Quality 1621 Mail Service Center Raleigh, NC 27699-1621 Phone [phone]
Internet www.esb.enr.state.nc.us 4401 Reedy Creek Rd. Raleigh, NC 27607 FAX [phone]
An Equal Opportunity/Affirmative Action Employer— 50% Recycled/10% Post Consumer Paper
N,o�,r�hCarolina
,Natural/ j,
Customer Service

Page 2
City of Monroe
November 15, 2005
The Division has evaluated your copper and/or zinc monitoring data. The Division has also developed a prospective
NPDES permit limit based on your facility's instream waste concentration, the copper and/or zinc action level criterion and a
translator procedure. Based on this data your prospective copper permit limit is 14 µg/L and your prospective zinc permit
limit is 114 µg/L.
The permittee, upon experiencing two or more toxicity nmitviolations durink. tonicity testing calendar
quarter must either provide DWQ with:
a) Written notification indicating acceptance of the prospective copper and/or zinc permit
limit. Notification is due within 30 days after the date of the second WET Notice of
Violation.
OR
b) Written notification indicating your choice of option(s) as noted on page one of this
correspondence. Notification is due within 30 days after the date of the second WET Notice of
Violation. DWQ approval of options 1-3 (previous page) is not necessary as the Division expects work
to rule out copper and/or zinc as causative effluent toxicants to begin immediately upon the second
WET permit limit violation.
Written notification (a or b above) shall be sent to:
North Carolina Division of Water Quality
Environmental Sciences Section
Aquatic Toxicology Unit
1621 Mail Service Center
Raleigh, North Carolina 27699-1621
PIease note that if you choose item b) above, you will be given nine months to submit documentation that eliminates
copper and/or zinc as causative effluent toxicants. Your final report should be comprehensive and include all data used to
support your conclusion(s). Should the data indicate copper and/or zinc as the source of effluent toxicity or if the data are
inconclusive as to copper and/or zinc's role as a toxicity source, then the NPDES Permit will be reopened and the metal
limits specified above will be applied to the permit. The report is due nine months after the date of the second WET Notice
of Violation.
Three copies of the final report shall be submitted to:
North Carolina Division of Water Quality
Environmental Sciences Section
Aquatic Toxicology Unit
1621 Mail Service Center
Raleigh, North Carolina 27699-1621
You should consider submitting the above correspondence certified mail.
Failure to notify DWQ of your acceptance of a copper and/or zinc limit, failure to notify DWQ of your option
selection or failure to make acceptable demonstration to DWQ that copper and/or zinc are not causative effluent toxicants
within the stated time frames will result in reopening of the NPDES Permit to include copper and/or zinc numeric limitations,
as appropriate.

Page 3
City ofMonroe
November 15, 2005
If the, effluent is toxic, then we expect work to commence immediately with toxic effluent samples, Failure to
initiate work with toxic effluent samples during the study period is unacceptable and will, be considered a failure to make
acceptable demonstration as cited above. We recommend a minimum, ofthree separate sampling events during the nine
month period to definitively rule out copper andior zinc as causative effluent toxicants,
Please note that your actions to notify DWQ of prospective limit acceptance or to notify DWQ of plan option(s) and
subsequent submission of a plan are contingent upon two or more toxicity NPDES permit limit violations occurring during a
toxicity testing calendar quarter.
Also note that the WET limit will remain in your NPDES permit regardless of whether metals are the source of
effluent toxicity. The data resulting from your actions to disprove copper and/or zinc as sources of effluent toxicity will.
determine whether NPDES Permit limits will be assigned for these parameters. You are responsible for initiating actions to
address these issues.
You may consider entering into a Special Order by Consent (SOC) with DWQ, A SOC provides regulatory relief
for specific NPDES permit :limit violations and, if signed, will contain a requirement to conduct a Toxicity Reduction
Evaluation. The SOC will contain a compliance schedule, stipulated penalties for failing to meet milestone activity dates and
may contain upfront penalties to settle past permit limit 'violations.
Additional information regarding the Division's Copper and Zinc Action Level Policy can be found at the following
web site - hrtp://www.eshenr.statencus. Click on the "Aquatic Toxicology" Unit and go to the prompt "AT Downloadable
Files" located at the bottom of the page. This web site also contains EPA's "Toxicity Reduction Evaluation Guidance for
Municipal Wastewater Treatment Plants." Section 4 of this document contains pertinent information on Toxicity
Identification Evaluations,
If you have any questions concerning this correspondence, please contact me or Mr. Kevin Bowden at (919) 733-
2136.
Sincerely,
Matt Matthews
Aquatic Toxicology Unit, Supervisor
ATTACHMENTS
cc: Rex Gleason -Mooresville Regional Office (no attachments)
Dawn Jeffries- Point Source Branch (no attachments)
Marshall Hyatt-USEPA Region IV, Atlanta Federal Center, 61 Forsyth St., SW, Atlanta, GA
30303 (no attachments)
Central Files (no attachments)
Aquatic Toxicology Unit Files (no attaclunents)

FRp William eEasley, G RossJr., Sec Governor
North Carolina Department of Environment and Natural Resources
7
Alan W. Klimek, P. E. Director
Division of Water Quality
May 4, 2005
Mr. Russell CoIbath
Water Resources Director
City of Monroe
Post Office Box 69
Monroe, North Carolina
Subject: Toxicity Test Results
City of Monroe WWTP
NPDES Permit No. NC0024333
Union County, NC
Dear Mr. Colbath:
Enclosed is a copy of the toxicity test results relative to the inspection conducted at the
subject facility on April 19, 2005 by John Lesley of this Office. Effluent Samples were collected
on April 19 and 22, 2005 by Division staff for use in a chronic Ceriodaphnia dubia pass/fail
toxicity test. The test utilizing these samples resulted in a pass.
The report'should be self-explanatory; however, should you have any questions concerning
this report, please do not hesitate to contact Mr. Lesley or me at [phone].
Sincerely,
y D. Rex Gleason,P.E.
Surface Water Protection Regional Supervisor
Enclosure
cc: Central Files
Kevin Bowden, Aquatic Toxicology Unit
Union County Health Department
NorihCarolina
Naturally
NCDENR
N. C. Division of Water Quality, Mooresville Regional Office, 610 E. Center Ave. Suite 301, Mooresville NC 28115 [phone] Customer Service
1-877-623-6748

City of Monroe WWTP
NPDES Permit No. NC0024333
Page 2
Whole effluent samples were collected on April 19 and 22, 2005 by John Lesley for use in
a chronic Ceriodaphnia dubia pass/fail toxicity test. Monroe WWTP has an effluent discharge
permitted at 10.4 MGD entering Richardson Creek (7Q10 of 0.43 CFS). The test using these
samples resulted in a pass. Toxicity test information follows:
Test Type
Test Concentration
Test Result
Control Survival
Control Mean Reproduction
Test Treatment Survival
Treatment Mean Reproduction
First Sample pH
First Sample Conductivity
First Sample Total Residual Chlorine
Second Sample pH
Second Sample Conductivity
Second Sample Total Residual Chlorine
3-Brood Ceriodaphnia dubia pass/fail
90% sample
Pass
100%
24.0 neonates
100%
20.4 neonates
7.26 SU
684 micromhos/cm
<0.0052 mg/1
7.05 SU
845 micromhos/cm
<0.0052 mg/1
Test results for these samples indicate that the effluent would not be predicted to have
water quality impacts on the receiving stream.

Division of Water Qua
April 28, 2005
To: Rex Gleason
Water Quality supervisor, M,RO
Through: Matt Matthews 14'
Supervisor, Aquatic Toxicology Unit
Sandy Must
Quality Assurance Officer, Aquatic Toxicology Unit.
Subject: Whole effluent toxicity, test results
Monroe WWTP
NPDES Permit # NC00243331001
Union County
MAY C al2005
The aquatic toxicity test using 24-hour composite samples of effluent discharged from Monroe
WWTP has been completed. Monroe WWTP has an effluent discharge permitted at 10.4 million
gallons per day (MOD) entering Richardson Creek (7Q10 of0.43 CFS). Whole effluent samples
were collected. on April 1.9 and 22, 2005 by John Lesley and facility personnel for use in a
chronic Ceriodaphnia dubia pass!fail toxicity test. The test using these samples resulted in a
pass. Toxicity test information follows.
Test T ype 3-Brood Cerioclaaphrria dubia pass/fail.
Test Concentrations 90% sample
st Result Pass
Survival 100%
Control. Reproduction 24.0 neonates
Test "treatment Survival 100%
Treatment Mean Reproduction 20.4 neonates
First Sample pH 7.2,6 SU
First Sample Conductivity 684 micromhoslcrrr
First; Sample Total Residual Chlorine <0,0052 n
Second Sample pH 7.05 SU
Second Sample Conductivity 845 micrornh.os!
Second Sample Total Residual Chlorine :0.0052 mglI
Test results for these samples indicate that the effluent would not he predicted to have water
quality impacts on receiving water. Please contact us if further of u.ent toxicity monitoring is
desired. We may be reached at [phone].
Basin: YAD14
cc: Central Files
Aquatic Taticca a � Craa't eta= rc ra as xat a ci aaa

F. Easley. Governor
r- WZIT:vrn G_ Ross. Jr.,Secretary
North Carona Department of Environment and Natural Resources
Alan W. lffrc> P.E. Director
Division of Water Duality
April 24, 2003
Mr. Russell Colbath
Water Resources Director
City of Monroe
PO Box 69
Monroe, North Carolina 28111
Subject: Correction: Toxicity Test Results
City ofMonroe WWI?
NPDES Permit No. NC0024333
Union County, NC
Dear Mr. Colbath:
Enclosed is a corrected copy of the toxicity test results relative to the Compliance
Biomonitoring Inspection conducted at the subject facility on March 18, 2003 by John Lesley of
this Office. Effluent Samples were collected on March 18 and 21, 2003 by Division stafifor use in
a chronic Ceriadaphnia dubia pass/fail toxicity test Heavy rain occurred during the week of
sample collection that may have produced conditions in the effluent that were not representative of
the average discharge. The test utilizing these samples resulted in a failure.
The toxicity test results should be self-explanatory: however, should you have any
questions concerning this report, please do not hesitate to contact Mr. Lesley or me at (704) 663-
1699.
P27
Attachment
cc: Central Files
Kevin Bowden, Aquatic Toxicology
Union County Health Department
Sincerely,
Rex GIeason` .E.
Water Quality Regional Supervisor
OEce. cYc AiaZ Mai Sr Woresae. NC 23115
PHONE (M;
Ir X
Customer Service
crn r;'7�_772fl

Monroe WWTP
NPDES Permit No. NC0024333
Page 2
Whole effluent samples were collected on March 1 -18 and 20-2 i, 2003 by Facility staff -
and Division personnel for use in a chronic Ceriodaphnia dtrnia pass:fad toxicity test_ It should be
noted that heavy rains (>6 inches) occurred during the week of -sample collection_ Two tests were
conducted on the samples. Monroe WWTP has an effluent discharge permitted at 9.00 MGD
entering Richard Creek (7Q10 of 0.43 CFS). Both tests using. these samples resulted in iai1ures;
however, one of the tests was invalid due to control performance criteria vreak:us_ Toxicity test
information follows (for the valid test):
Test Type
Test Concentration
Test Result
Control Survival
Control Mean Reproduction
Test Treatment Survival
Treatment Mean Reproduction
First Sample pH
First Sample Conductivity
First Sample Total Residual Chlorine
Second Sample pH
Second Sample Conductivity
Second Sample Total Residual Chlorine
3-Brood Ceriodaphnia dzrbia pa ffail
90% sample
FAIL
100%
29.S neonates
100%
21.6 neonates
6.54 St
414 micrornhos/cm
<0.030 mg.'I
6.52 SL
3 34 mice nihos/cm
<3.030 mg 1
Test results for these samples indicate that the eEhiem may be predicted to have waxer
quality impacts on the receiving stream.

Michael F. Easley. Govemor
William G. Ross, Jr.,Secretary
North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P.E., Director
Division of Water Quality
April 21, 2003
Mr. Russell Colbath
Water Resources Director
City of Monroe
PO Box 69
Monroe, North Carolina 28111
Subject: Notice of Deficiency
Compliance Biomonitoring Inspection
Toxicity Test Results
City of Monroe WWTP
NPDES Permit No. NCO024333
Union County, NC
Dear Mr. Colbath:
Enclosed is a copy of the toxicity test results relative to the Compliance Biomonitoring
Inspection conducted at the subject facility on March 18, 2003 by John Lesley of this Office.
Effluent Samples were collected on March 18 and 21, 2003 by Division staff for use in a chronic
Ceriodaphnia dubia pass/fail toxicity test. Heavy rain, occurred during the week of sample
collection that may have produced conditions in the effluent that were not representative of the
average discharge. The test utilizing these samples resulted in a failure.
It is requested that a written response be submitted by no later than May 5, 2003 that detail
efforts the City of Monroe is taking to identify sources of toxicity and other information that may
be relative to the toxicity test failure. PIease send your response to the attention of Mr. Lesley and
copy Mr. Kevin Bowden of the Aquatic Toxicology Unit.
The toxicity test results should be self-explanatory; however, should you have any
questions concerning this report, please do not hesitate to contact Mr. Lesley or me at (704) 663-
1699.
Sincerely,
. Rex Gleason, P.E.
Water Quality Regional Supervisor
Attachment
cc: Central Files
Kevin Bowden, Aquatic Toxicology
Union County Health Department
5brneselleRmzioraCt.S19 Borth Main Street, Mooresville, NC 28115
PHONE (704) 6+4-i
=AX
Customer Service
1 BOO 523-774B

Monroe WWTP
NPDES Permit No. NC0024333
Page 2
Whole effluent samples were collected on March 17-18 and 20-21, 2003 by facility staff
and Division personnel for use in a chronic Ceriodaphnia dubia pass/fail toxicity test. It should be
noted that heavy rains (>6 inches) occurred during the week of sample collection. Two tests were
conducted on the samples. Monroe WWTP has an effluent discharge permitted at 9.00 MGD
entering Richard Creek (7Q10 of 0.43 CFS). Both tests using these samples resulted in failures;
however, one of the tests was invalid due to control performance criteria problems. Toxicity test
information follows (for the valid test):
Test Type
Test Concentration
Test Result
Control Survival
Control Mean Reproduction
Test Treatment Survival
Treatment Mean Reproduction
First Sample pH
First Sample Conductivity
First Sample Total Residual Chlorine
Second Sample pH
Second Sample Conductivity
Second Sample Total Residual Chlorine
3-Brood Ceriodaphnia dubia pass/fail
90% sample
Pass
100%
29.8 neonates
100%
21.6 neonates
6.54 SU
414 micromhos/cm
<0.030 mg/1
6.52 SU
334 micromhos/cm
<0.030 mg/1
Test results for these samples indicate that the effluent may be predicted to have water
quality impacts on the receiving stream.

Division of Water Quality
- Aquatic Toxicology Unit.
April 2, 2003
To: Rex Gleason
Water Quality Supervisor, MRO
Through: Matt Matthews
Supervisor, Aquatic. Toxicology Unit
From: Sandy Mort
Quality Assurance Officer, Aquatic Toxicology Unit
Subject: Whole effluent toxicity test results
Monroe WWTP
NPDFS Permit # NCO024333/001
Union County
The aquatic toxicity tests using 24-hour composite samples of effluent discharged from
Monroe W'WTP has been completed. Monroe WWTP has an effluent discharge permitted at
9.00 million gallons per day (MGD) entering Richardson Creek (7Q10 of 0.43 CFS). Whole
effluent samples were collected on March 18 and 21 by John Lesley and facility personnel for
use in a chronic Ceriodaphnia dubia pass/fail toxicity test. Two pass/fail tests were run on
the samples. Both tests resulted in a fail. One of the tests was invalid due to control
performance criteria and should not be used for compliance monitoring. Toxicity test
information for both tests follows.
Test Type
Test Concentrations.
Test Result .
Control Survival
Control Mean Reproduction
Test Treatment Survival
Treaatment Mean Reproduction
First Sample pH
Fiat Sample Conductivity
First Sample Total. Residual Chlorine
Second Sample pH
Second Sample Conductivity
Second Sample Total Residual Chlorine
3-Brood Ceri
90% sample
Fat,
100%
29.8 neonates
100%
21.6 neonates
6.54 SU
414 micromhos/cm.
<0,0300 mg/L
6.52 SU
334 micromhos/cm.
<0.0300 mg/L
("tibia pass/fail
A
Environrrrental Sciences Branch
ter° Quality Section

Toxicity test information for the second test.
Test Type 3-Brood Ceriodaphnia dubia pass/fail
Test Concentrations 90% sample
Test Result Fail (Invalid)
Control Survival 100%
Control Mean Reproduction 23.0 neonates
Test Treatment Survival 100%
Treatment Mean Reproduction 17.5 neonates
Test results for these samples indicate that the effluent would be predicted to have water
quality impacts on receiving water. Please contact us if further effluent toxicity monitoring is
desired. We may be reached at [phone].
Basin: YAD14
cc: Central Files
Environmental Sciences Branch Water Quality Section