NC0020648_Permit (Modification)_20120423

NPDES DOCUMENT :SCANNING COVER SHEET
NPDES Permit:
NC0020648
Washington WWTP
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
<�
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Correspondence
Owner Name Change
Staff Report
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
April 23, 2012
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North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Charles Wakild, P. E. Dee Freeman
Governor Director Secretary
April 23, 2012
Mr. Stephen Adam Waters II
Water Resources Superintendent
City of Washington
PO Box 1988
Washington, NC 27889
Subject: Permit modification of NC0020648
City of Washington Regional WWTP
Treatment Class IV
Beaufort County
Dear Mr. Waters:
The Division of Water Quality (Division) staff have reviewed and approved your
request for modification of the subject permit. An evaluation of submitted data for bis
(2-ethylhexyl) phthalate indicated all data was below detection and there is no
reasonable potential to exceed the federal criteria. Therefore, the effluent limitation
can be removed.
Enclosed are the permit cover page and the amended effluent page. Please
replace and discard the existing pages. 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.
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,
Post Office Drawer 27447, Raleigh, North Carolina 27611-7447. Unless such a
demand is made, this permit shall be final and binding.
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
Location: 512 N. Salisbury St. Raleigh, North Carolina 27604
Phone: [phone] FAX: [phone]
Internet www.ncwateraualitv.orq
one C1Y011 NO113
)VaturaIIij
An Equal Opportunity 1 Affirmative Action Employer

Mr. Waters
April 23, 2012
Page 2 of 2
Please take notice that this permit is not transferable. Part II,
the requirements to be followed in case of change in ownership or
discharge.
If you have any questions or need additional information,
Jacquelyn M. Nowell, telephone number [phone].
Attachments
cc: Washington Regional Office/Surface Water Protection Section
NPDES Permit File
Central Files
Aquatic Toxicology Unit, Susan Meadows
EPA Region 4/ Pamala Myers
E.4. addresses
control of this
please contact

Permit No. NC0020648
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provisions of North Carolina General Statute 143-215.1, other lawful
standards and regulations promulgated and adopted by the North Carolina Environmental
Management Commission, and the Federal Water Pollution Control Act, as amended, the
City of Washington
is hereby authorized to discharge wastewater from a facility located at the
City of Washington WWTP
1399 West 2nd Street
Washington
Beaufort County
to receiving waters designated as the Tar River in the Tar -Pamlico River Basin in accordance
with effluent limitations, monitoring requirements, and other conditions set forth in Parts I, II, III
and IV hereof.
This permit modification shall become effective April 23, 2012.
This permit and authorization to discharge shall expire on November 30, 2014.
Signed this day April 23, 2012.
w1
�iiarles Wakild, P.E, Director
Division of Water Quality
By Authority of the Environmental Management Commission

Permit No. NC0020648
A (1) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
Beginning on the effective date of this permit and lasting permit expiration, the Permittee is
authorized to discharge treated wastewater from Outfall 001. Such discharges shall be limited
and monitored by the Permittee as specified below:
NITO
asurerrment
quency:
ING REQUIREME_
Flow (MGD)
3.65
Continuous
Recording
I or E
BOD5 2
13.1 mg/L
19.6 mg/L
Daily
Composite
I, E
Total Suspended Solids2
30.0 mg/L
45.0 mg/L
Daily
Composite
I, E
NH3 as N
3.5 mg/L
10.5 mg/L
Daily
Composite
E
Dissolved Oxygen
Daily average not less than 5.0 mg/L
Daily
Grab
Fecal Coliform
(geometric mean)
200/100
ml
400/100 ml
Daily
Grab
Total Residual Chlorine3
28.0 pg/L
Daily
Grab
Temperature
Daily
Grab
pH
Between 6.0 and 9.0 Standard Units
Daily
Grab
Conductivity
Daily
Grab
Total Nitrogen
(NO2+NO3+TKN) 4
Total Keldahl Nitrogen
(TKN)
Nitrite/Nitrate Nitrogen 4
(NO2-N+NO3-N)
Total Phosphorus 4
Monitor and Report (mg/L)
Monitor and Report (mg/L)
Monitor and Report (mg/L)
Monitor and Report (mg/L)
Weekly
Weekly
Weekly
Monthly
(Calculated)
Composite
Composite
Composite
Total Copper (pg/L)
Monthly
Composite
Total Zinc (pg/L)
Monthly
Composite
Acute Toxicity 5
Quarterly
Composite
Effluent Pollutant Scan 6
Annually
Composite
Footnotes:
1. I: Influent. E: Effluent. See condition A. (2) of this permit for instream monitoring requirements.
2. The monthly average BOD5 and Total Suspended Solids concentrations shall not exceed 15% of
'the respective influent value (85% removal).
3. The Division allows a 50 pg/L TRC compliance level. You must report actual results on DMR
submittals, but for compliance purposes, all TRC valued below 50 pg/L will be deemed compliant.
4. See condition A (3) for nutrient reduction special condition.
5. Acute Toxicity (Pimephales promelas) @ 90%, February, May, August and November; see special
condition A. (4.) of this permit.
6. See Special Condition A (5)
THERE SHALL BE I30 DISCHARGE OF FLOATING SOLIDS OR FOAM.

City of Washington REASONABLE POTENTIAL ANALYSIS
NC0020648
Qw (MGD) = 3.65
1QIOS(cfs)= 0.00
7Q1OS(cfs)= 0.00
7QIOW(cfs)= 0.00
30Q2 (cfs) = 0.00
Avg. Stream Flow, QA (cfs) = 0.00
Receiving Stream: Tar River
WWTP/WTP Class: IV
1WC @ 1QIOS = 100.00%
IWC @ 7Q10S = 100.00%
1WC@7Q10W= 100.00%
IWC @ 30Q2 = 100.00%
IWC @ QA = 100.00%
Stream Class: C-NSW
Outfall 001
Qw = 3.65 MGD
CHRONIC TEST CONCENTRATION = DEFAULT %
=90%
PARAMETER
TYPE
(1)
STANDARDS & CRITERIA (2)
-J
a
UNITS
REASONABLE POTENTIAL RESULTS
RECOMMENDED ACTION
NC WQS /
Chronic
Applied % FAV /
Standard Acute
Il
R Det. Max Pred
Allowable
Cw Cw
Bis (2-Ethylhexyl) Phthalate
C
2.2
HH(Qavg)
µeA
19
0
10.00000
Acute: NO WQS
_ _ _ _ _ _ _ _ _
Chronic: 2.20000
I i; "iucr,1 Aii";.hlc [\c
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
No RP, all values below detection- No Monitoring
required
0
0
N/A
Acute:
— -- --- -- — - —•
Chronic:
-- ------- - — ------------ -- --
0
0
N/A
Acute:
_ ----------•------
Chronic:
---- -----------------
0
0
N/A
Acute:
—__ _ _ ----------
Chronic:
•---------------------------
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11) get-1 la vt[i(i/i9) it of 4 4- ID
Page 1 of 1
20648bis2rpa2012, rpa
4/18/2012

City of Washington
P.O. Box 1988, Washington, NC 27889-1988
March 12, 2012
Mr. Gil Vinzani
Division of Water Quality
1617 Mail Service Center
Raleigh, NC 27699-1617
Re: Minor Permit Modification
Mr. Vinzani:
Per our conversation, the City of Washington (permit number NC0020648) would like to
request a minor permit modification to eliminate the Bis(2-Ethylhexyl) Phthalate limit
from the Wastewater Treatment Plant monthly effluent limit and monitoring
requirements. Enclosed are the Discharge Monitoring Reports from July 2010 to January
2012. These reports show there has been no detection of the Bis(2-Ethylhexyl) Phthalate
parameter since the monthly monitoring began and that there is no reasonable potential to
exceed Water Quality standards.
If you have any questions please feel free to contact me at [phone] or via email at
[e-mail].
Sincerely,
Hope Woolard
Chemical/Preatment Anaylst
cc: Adam Waters; Water Resources Superintendent
File
-D)E@NOWLE@
Jur
MAR 1 3 2012
DENR-WATER QUALITY
PONT SOURCE BRANCH
102 E. Second St. • Telephone [phone] TDD 1-800-735-2962 • Fax [phone]