NC0023736_Permit (Modification)_20070815

NPDES DOCUMENT SCANNINO COVER !MEET
NPDES Permit:
NC0023736
Gunpowder Creek 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:
August 15, 2007
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content on the rezrerse side

ATI
NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Michael F. Easley, Govemor William G. Ross, Jr., Secretary
Coleen H. Sullins, Director
August 15, 2007
Mr. Monte L. Wall
WWTP Superintendent
P.O. Box 958
Lenoir, NC 28645
Subject: Minor Modification / NPDES Permit NC0023736
Gunpowder Creek WWTP
Caldwell County
Dear Mr. Wall:
The Gunpowder Creek NPDES permit has been modified per your request dated march 29, 2007. Please find
attached the modified sections of this permit, and replace the old pages with these modified pages. This
permit modification is issued pursuant to the requirements of North Carolina General Statute 143-215.1 and
the Memorandum of Agreement between North Carolina and the U.S. Environmental Protection Agency dated
May 9, 1994 (and as subsequently amended).
This permit modification contains the following changes from your existing permit:
• Total Lead and Total Chromium limits have been deleted. Reasonable potential analyses showed
acceptable effluent concentrations discharged by the Gunpowder Creek WWTP.
• The permit expiration date has been changed to January 31, 2010. This change places the
Gunpowder Creek WWTP permit in the correct sequence with other NPDES permits in the
Catawba River basin.
If any parts, measurement frequencies or sampling requirements contained in this permit modification 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,
Post Office Drawer 27447, Raleigh, North Carolina 27611-7447. Unless such a demand is made, this permit
shall be final and binding.
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 or need additional information, please contact Toya Fields at (919) 733-
5083, extension 551 or [e-mail].
ta%
cc: Central Files NPDES file PERCS / Dana Folley
Asheville Regional Office. Surface Water Protection
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
512 North Salisbury Street, Raleigh, North Carolina 27604
Internet: h2o.enr.state.nc,us
Phone: [phone], extension 511 / FAX [phone]
charles.weaverOncmail. net
Sincerely,
w
an W. Klimek, P.E.
Nne
orthCarolina
Naturally,
An Equal Opportunity/Affirmative Action Employer — 50% Recycled/10% Post Consumer Paper

Permit NC0023736
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,
City of Lenoir
is hereby authorized to discharge wastewater from a facility located at
Gunpowder Creek Wastewater Treatment Plant
NCSR 1127.
Caldwell County
to receiving waters designated as Gunpowder Creek in subbasin 03-08-32 of the Catawba 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 September 1, 2007.
This permit and the authorization to discharge shall expire at midnight on January 31, 2010.
Signed this day August 15, 2007.
aih,„)
ti Coleen H. Sullins, Director
Division of Water Quality
By Authority of the Environmental Management Commission

Permit NC0023736
A. (1) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
During the period beginning on the effective date of the permit and lasting until expiration, the Permittee is
authorized to discharge from outfall(s) serial number 001. Such discharges shall be limited and monitored by
the Permittee as specified below:
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Flow
2.0 MGD
Continuous
Recording
r
Influent Effluent
BOD5 2
30.0 mgll
45.0 mg/l
Daily
Composite
Influent and
Effluent
. Total Suspended Solids 2
30.0 mg/I
45.0 mg/I
Daily
Composite
Influent and
Effluent
NH3-N
(Apr 1 through Oct 31)
2.0 mg/I
6.0 mg/L
Daily
Composite
Effluent
NH3-N
(Nov 1 through May 31)
4.0 mg/I
12.0 mg/L
Daily
Composite
Effluent
Dissolved 0xygen3
Daily average > 5.0 mg/L
Daily
Grab
Effluent
Dissolved 0xygen4
Weekly
Grab
U & D
Fecal Coliform
200/100 ml
400/100 ml
Daily
Grab
Effluent
Fecal Caliform4
Weekly
Grab
U & D
pH
> 6.0 and < 9.0 standard units
Daily
Grab
Effluent
pH4
Weekly
Grab
U & D
Total Residual Chlorines
28 pg/I
Daily
Grab
Effluent
Temperature
Daily
Grab
Effluent
Temperatures
Weekly
Grab
U & D
Total Nitrogen
Monthly
Composite
Effluent
Total Nitrogen8
Monthly'
Grab
U & D
Total Phosphorus
Monthly
Composite
Effluent
Total Phosphorus8
Monthly
Grab
U & D
Conductivity
Day
Grab
Effluent
Conductivity 4
Weekly
Grab
U & D
Chronic Toxicity8
Quarterly
Composite
Effluent
Total Cadmium
3.9 µg/l
15 µg/l
Weekly
Composite
Effluent
Total Selenium
9.7 µgll
Weekly
Composite
Effluent
Total Copper
2/Month
Composite
Effluent
Total Zinc
2/Month
Composite
Effluent
Total Silver
2/Month
Composite
Effluent
Notes
1. U: At least 100 feet upstream from the outfall. D: approximately 2,000 feet downstream from the outfall.
2. The monthly average BOD5 and Total Suspended Solids concentrations shall not exceed 15% of the
respective influent value (85% removal).
3. Sampling frequency increases to 3/week during June, July, August and September.
4. Monitoring requirement applies only if chlorine is added for disinfection.
5. Chronic Toxicity (Ceriodaphnia) P/F @ 52%; March, June, September, December [see A. (3)1
6. Monthly instream nutrient monitoring required May 1- September 30.
There shall be no discharge of floating solids or foam visible in other than trace amounts.

City of Lenoir
Public Utilities Department
Gunpowder Creek WWTP
P.O. Box 958
Lenoir, North Carolina 28645
March 29, 2007
Alan Klimek, P.E., Director
NC DENR / Division of Water Quality
1617 Mail Service Center
Raleigh, NC 27699-1617
APR 3 2001 I
Subject: Limit Removal Request for the City of Lenoir — Gunpowder Creek
WWTP (Permit # NC0023736) for Parameters Total Chromium
and Total Lead
Dear Mr Klimek:
The City of Lenoir would like to request the removal of the NPDES
wastewater discharge permit limits for total lead and total chromium for the
Gunpowder Creek VVWTP (Permit # NC0023736). The permit limits for
those parameters are scheduled to take effect on June 1, 2007.
Enclosed are the data for calendar year 2006 (new permit was effective
January 1, 2006). All lead analyses results were below detection (40
samples BDL of 40). Also, all chromium analyses results were below
detection (24 samples BDL of 24).
Thank you for considering dropping these limits.
If you require any other information, please call me at 828-757-2198.
Sincerely,
ftP/F/4(4e
Monte L. Wall
Superintendent Wastewater Treatment
City of Lenoir

GUNPOWDER CREEK WWTP EFFLUENT LEAD AND CHROMIUM RESULTS 2006
(iPD344 NCOo23736)
DATE Effluent Pb (pg/L) DATE Effluent Cr (pg/L)
1/3/2006 <5 1/10/2006 <2
1/10/2006 <5 1/24/2006 <2
1/24/2006 <5 2/22/2006 <2
1/30/2006 <5 2/28/2006 <2
2/8/2006 <5 3/21/2006 <2
2/15/2006 <5 4/11/2006 <2
2/22/2006 <5 4/25/2006 <2
2/28/2006 <5 5/2/2006 <2
3/15/2006 <5 5/10/2006 <2
4/4/2006 <5 5/25/2006 <2
4/19/2006 <5 6/7/2006 <2
4/25/2006 <5 6/21/2006 <2
5/2/2006 <5 7/11/2006 <2
5/4/2006 <5 7/25/2006 <2
5/10/2006 <5 8/7/2006 -<2
5/16/2006 <5 8/21/2006 <2
5/25/2006 <5 9/12/2006 <2
6/7/2006 <5 9/27/2006 <2
6/13/2006 <5 10/10/2006 <2
6/21/2006 <5 10/18/2006 <2
7/5/2006 <5 11/7/2006 <2
7/11/2006 <5 11/22/2006 <2
7/25/2006 <5 12/5/2006 <2
8/1/2006 <5 12/20/2006 <2
8/7/2006 <5
8/15/2006 <5 Total # samples 24
8/21/2006 <5 # samples BDL 24
8/29/2006 <5
9/12/2006 <5
9/19/2006 <5
9/27/2006 <5
10/3/2006 <5
10/10/2006 <5
10/18/2006 <5
11/2/2006 <5
11/13/2006 <5
11 /21 /2006 <5
12/1/2006 <5
12/13/2006 <5
12/20/2006 <5
Total # samples 40
# samples BDL 40