NC0020648_Permit (Issuance)_20100615

NPDES DOCUMENT SCANNING COVER SHEET
NPDES Permit:
NC0020648
Washington WWTP
Document Type:
ermit 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:
June 15, 2010
This document is printed on reuse paper - ignore any
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NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins Dee Freeman
Governor Director Secretary
June 15, 2010
Mr. Stephen Adam Waters II, Water Resources Superintendent
City of Washington
PO Box 1988
Washington, NC 27889
Subject: Issuance of NPDES Permit NC0020648
City of Washington Regional WWTP
Beaufort County
Dear Mr. Waters:
The Division of Water Quality (Division) personnel have reviewed and approved your application for
renewal of the subject permit. Accordingly, we are forwarding the attached NPDES discharge permit. It 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 14, 2010. All
additions previously made in the draft permit are retained, as follows:
• Bis (2-ethylhexyl) phthalate monitoring with limits. The priority pollutant analysis sampling results
contained an exceedance above the human health standard.
• A special condition for nutrient reduction. All members of the Tar -Pamlico Association receive this
special condition regarding nutrient limits and enforceability.
• TKN and Nitrite -Nitrate monthly composite sampling, following the strategy for Association -member
renewals in the Tar -Pamlico basin.
• A footnote to the limit for total residual chlorine. The Division now allows a 50 pg/L TRC compliance
level. You must report actual results on DMR submittals, but for compliance purposes, all TRC values
below 50 erg/L will be deemed compliant.
If any parts, measurement frequencies, or sampling requirements contained in this permit are
unacceptable, you have the right to an adjudicatory hearing upon written request within thirty (30) days
after receiving this letter. Your request must take the form of a written petition conforming to Chapter 150B
of the North Carolina General Statutes, and must be filed with the Office of Administrative Hearings, 6714
Mail Service Center, Raleigh, North Carolina 27699-6714. Unless such demand is made, this permit
remains 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] Customer Service: 1-877-623-6748
Internet: www.ncwaterquality.org
An Equal opportunity \ Atfirmative Action Employer
NOorfthCarolina
Z%2aturaIfjj

This permit is not transferable except after notifying the Division of Water Quality. The Division may modify
and reissue, or revoke this permit. Please notice that this permit does not affect your legal obligation to
obtain other permits required by the Division of Water Quality, the Division of Land Resources, the Coastal
Area Management Act, or other federal or local governments.
If you have questions, or if we can be of further service, please contact Mr. Gil Vinzani at
[[e-mail] or call [phone].
Sincerely,
ti
Coleen H. Sullins
Enclosure: NPDES Permit FINAL NC0020648
cc: Washington Regional Office/Surface Water Protection Section
NPDES Permit Files
Central Files
Aquatic Toxicology Unit, Susan Meadows (E-mail copy)
EPA Region 4, Marshall Hyatt (permit and fact sheet, E-mail copy)
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.ncwaterqualitv.org
An Equal Opportunity Allurnati e Action Employer
One
NorthCarolina
Naturally

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 shall become effective July 1, 2010.
This permit and authorization to discharge shall expire on November 30, 2014.
Signed this day June 15, 2010:
UtAk
een H. Sullins, Director
Division of Water Quality
By Authority of the Environmental Management Commission

Permit No. NC0020648
4
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.
City of Washington
is hereby authorized to:
1. Continue to operate an existing 3.65 MGD wastewater treatment facility located off
Second Street, Washington, Beaufort County, and consisting of:
• Influent metering vault
• Mechanical bar screen
• Automatic aerated grit chamber
• Splitter box
• Aeration basin
• Activated sludge oxidation ditch
• Four secondary clarifiers with scum removal and pumped sludge return
• Five cell deep -bed denitrification sand filters with a methanol storage/feed
system
• Dual chlorine contact chambers with flow paced gaseous chlorine feed
• Sulfur dioxide dechlorination
• Reaeration Basin
• Lime storage tower
• Caustic soda and polymer feed system
• Sludge mixing tank with lime addition
• Four sludge thickening lagoons
• Recirculation pump and decant draw off
• 60,000 gallon mud well
• Sludge recirculation pump station
• Effluent pump station
• Effluent diffuser
2. Discharge from said treatment works, through outfall 001, into the Tar River, a•Class
C-NSW water in the Tar -Pamlico River Basin, at the location specified on the attached
map.

City of Washington
State Grid/Quad: E3OSE / Washington Latitude:
8-Digit HUC: 03020103 Longitude:
.Receiving Stream: Tar River Drainage Basin:
Stream Class: C-NSW Sub -Basin:
35° 35' 54" N
77° 04' 21" W
Tar -Pamlico River
03-03-07
1
North
Facility Location
not to scale
NPDES Permit No. NC0020648 .
Beaufort County

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:
EFFLUENT LIMITATIONS
MONITORING REQUIREMENTS
PARAMETER'
Monthly
Average
Weekly,
Average .
Daily
Maximum
Measurement
Frequency
Sam• ple Type
Sample
Location 1
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
E
Fecal Coliforrn
(geometric mean)
200/100
ml
400/100 ml
Daily
Grab
E
Total Residual Chlorine3
28.0 pg/L
Daily
Grab
E
Temperature
Daily
Grab
E
pH
Between 6.0 and 9.0 Standard Units
Daily
Grab
E
Conductivity
Daily
Grab
E
Total Nitrogen
(NO2+NO3+TKN) 4
Monitor and Report (mg/L)
Weekly
(Calculated)
E
Total Kjeldahl Nitrogen
(TKN)
Monitor and Report (mg/L)
Weekly
Composite
E
Nitrite/Nitrate Nitrogen 4 -
(NO2-N+NO3-N)
Monitor and Report (mg/L)
Weekly
Composite
E
Total Phosphorus 4
Monitor and Report (mg/L)
Monthly
Composite
E
Bis(2-Ethylhexyl)5
Phthalate (pg/L)
2.2 pg/L
2.2 pg/L
Monthly
Composite
E
Total Copper (pg/L)
Monthly
Composite
E
Total Zinc (pg/L)
Monthly
Composite
E
Acute Toxicity 6
Quarterly
Composite
E
Effluent Pollutant Scan 7
Annually
Composite
E
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. The Permittee may petition for elimination of this limit upon submittal of 12 months of data showing
no reasonable potential to exceed WQ standards.
6. Acute Toxicity (Pimephales promelas) @ 90%, February, May, August and November; see special
condition A. (4.) of this permit.
7. See Special Condition A (5)
THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR FOAM.

Permit No. NC0020648
A (2) INSTREAM MONITORING REQUIREMENTS
Instream monitoring is required for the following parameters at the locations specified:
EFFLUENT
*CHARACTERISTICS
Measurement Frequency : '
•
Sarnple Type
-
Sam 1e
• p
Loationl
Fecal Coliform
June -Sept
3/week
Grab
U, D
October -May
1/week
Dissolved Oxygen -
June -Sept
3/week
Grab
U, D
October -May
1/week
Temperature
June -Sept
3/week
Grab
U, D
October -May
1/week
Conductivity
June -Sept
3/week
Grab
U, D
October -May
1/week
Footnotes:
1. U - Upstream at Grimesland Bridge, D- Downstream at NC Highway 17.
Upon initiation of stream sampling by the Tar -Pamlico Basin Association, the instream
monitoring requirements as stated above are waived. Should your membership in the
Association be terminated, you shall notify the Division immediately and the instream
monitoring requirements specified in your permit shall be reinstated.
A (3) NUTRIENT REDUCTION
(1) Point source dischargers in the Tar -Pamlico River Basin are subject to the terms and
conditions of the Tar -Pamlico Nutrient Sensitive Waters Implementation Strategy: Phase
Ill (the "Agreement"), agreed to on April 14, 2005; and the nutrient TMDL for the Basin,
approved by the USEPA on August 10, 1995.
(2) The Permittee is a member of the Tar -Pamlico Basin Association, which consists of the
following fifteen facilities:
Membership of Tar -Pamlico Basin Association
Permit
Owner
Facility
NC0030317
City of Rocky Mount
Tar River Regional WWTP
NC0023931
Greenville Utilities Commission
GUC WWTP
NC0020605
Town of Tarboro
Tarboro WWTP
NC0025054
City of Oxford
Oxford WWTP
NC0020648
City of Washington
Washington WWTP
NC0069311
Franklin County
Franklin County WWTP
NC0020834
Town .of Warrenton
Warrenton WWTP

Permit No. NC0020648
NC0026042
Town of Robersonville
Robersonville WWTP
NC0020231
Town of Louisburg
Louisburg WWTP
NC0026492
Town of Belhaven
Belhaven WWTP
NC0025402
Town of Enfield
Enfield WWTP
NC0023337
Town of Scotland Neck
Scotland Neck WWTP
NC0020061
Town of Spring Hope
Spring Hope WWTP
NC0020435
Town of Pinetops . .
. Pinetops WWTP
NC0042269
Town of Bunn
Bunn WWTP
(3) The Agreement defines nitrogen and phosphorus caps for the Association as follows:
Phase I11 Nutrient Caps — Tar -Pamlico Basin Association'
Total Nitrogen
Total Phosphorus
(Ib/yr)
(kg/yr)
(lb/yr)
(kg/yr)
891,272
404,274
161,070
73,060
1) Includes allowed adjustment to the 1991 baseline
The Agreement also specifies that the Association has properly accrued and banked
nitrogen offset credits in the following amounts:
Nitrogen Offset Credits — Tar -Pamlico Basin Association
Nitrogen Credits
Timeframe
(lb)
(kg)
Phase I
10,138
4,608
Phase II
30,276
13,762
Phase III
10,564
4,802
(4) Consistent with TMDL requirements of 40 C.F.R. 122.44(d)(1),122.44(d)(1)(vii)(A) and
(B), and Section 301(b)(1)(C) of the federal Clean Water Act, the Phase III nutrient caps
and applied credits are hereby incorporated into this permit as enforceable limitations on
the aggregate discharge of nitrogen and phosphorus by the Association, as follows:
(5)
Nutrient Load Limits — Tar -Pamlico Basin Association
Total Nitrogen
Total Phosphorus
(lb/yr)
(kg/yr)
(Ib/yr)
(kg/yr)
Nutrient Caps
891,272
404,274
161,070
73,060
Applied Credits
0
0
NIA
N/A
Effective Load Limits
891,272
404,274
161,070
73,060
In accordance with the terms and conditions of the Phase III Agreement, the Association
may apply additional nitrogen offset credits in anticipation of future exceedances.
Application of credits shall be made through modification of the members' NPDES
permits.

Permit No. NC0020648
(6) The Division reserves the right to reopen this permit and make appropriate modifications
in the event that:
a. The current Agreement is revised to add or modify the nutrient caps, reporting •
requirements, or other requirements relevant to this permit.
b. The terms of the Agreement are violated, in which case the Division will implement
the strategy in Section X. of the Agreement, Violation of Terms of this Agreement.
c. The Director determines that additional requirements, including effluent limitations,
are necessary to prevent localized adverse impacts to water quality.
(7) No later than March 1 of each year, the Association shall prepare an annual report of its
performance for the previous calendar year to the Division at the following address:
Division of Water Quality, Point Source Branch
Attn: Tar -Pamlico NPDES Coordinator
1617 Mail Service Center
Raleigh, NC 27699-1617
The report shall include each member's monthly mass loadings and the Association's
aggregate annual loadings for Total Nitrogen and Total Phosphorus for the subject
calendar year.
A (4) ACUTE TOXICITY PASS/FAIL PERMIT LIMIT (QUARTERLY)
The permittee shall conduct acute toxicity tests on a quarterly basis using protocols defined in
the North Carolina Procedure Document entitled "Pass/Fail Methodology for Determining
Acute Toxicity in a Single Effluent Concentration" (Revised -July, 1992 or subsequent
versions). The monitoring shall be performed as a Fathead Minnow (Pimephales promelas) 24
hour static test. The effluent concentration at which there may be at no time significant acute
mortality is 90% (defined as treatment two in the procedure document). Effluent samples for
self -monitoring purposes must be obtained during representative effluent discharge below all
waste treatment. The tests will be performed during the months of February, May, August and
November.
All toxicity testing results required as part of this permit condition will be entered on the
Effluent Discharge Monitoring Form (MR-1) for the month in which it was performed, using the
parameter code TGE6C. Additionally, DWQ Form AT-2 (original) is to be sent to the following
address:
Attention: North Carolina Division of Water Quality
Environmental Sciences Section
1621 Mail Service Center
Raleigh, North Carolina 27699-1621
Completed Aquatic Toxicity Test Forms shall be filed with the Environmental Sciences Section
no later than 30 days after the end of the reporting period for which the report is made.
Test data shall be complete and accurate and include all supporting chemical/physical
measurements performed in association with the toxicity tests, as well as all dose/response

Permit No. NC0020648
data. Total residual chlorine of the effluent toxicity sample must be measured and reported if
chlorine is employed for disinfection of the waste stream.
Should there be no discharge of flow from the facility during a month in which toxicity
monitoring is required, the permittee will complete the information located at the top of the
aquatic toxicity (AT) test form indicating the facility name, permit number, pipe number,
county, and the month/year of the report with the notation of "No Flow" in the comment area of
the form. The report shall be submitted fo the Environmental Sciences Section at the address
cited above.
Should any single quarterly monitoring indicate a failure to meet specified limits, then monthly
monitoring will begin immediately until such time that a single test is passed. Upon passing,
this monthly test requirement will revert to quarterly in the months specified above.
Should the permittee fail to monitor during a month in which toxicity monitoring is required,
then monthly monitoring will begin immediately until such time that a single test is passed.
Upon passing, this monthly test requirement will revert to quarterly in the months specified
above.
Should any test data from either these monitoring requirements or tests performed by the
North Carolina Division of Water Quality indicate potential impacts to the receiving stream, this
permit may be re -opened and modified to include alternate monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as
minimum control organism survival 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) EFFLUENT POLLUTANT SCAN
The permittee shall perform an annual Effluent Pollutant Scan for all parameters listed in the
table below (in accordance with 40 CFR Part 136). The annual effluent pollutant scan samples
shall represent seasonal (summer, winter, fall, spring) variations over the 5-year permit cycle.
Unless otherwise indicated, metals shall be analyzed as "total recoverable." Additionally, the
method detection level and the minimum level shall be the most sensitive as provided by the
appropriate analytical procedure.

Permit No. NC0020648
Ammonia (as N)
Chlorine (total residual, TRC)
Dissolved oxygen
Nitrate/Nitrite
Total Kjeldahl nitrogen
Oil and grease
• Total Phosphorus -
Total dissolved solids
Hardness
Antimony
Arsenic
Beryllium
Cadmium
Chromium
Copper
Lead
Mercury (Method 1631 E)
Nickel
Selenium
Silver
Thallium
Zinc
Cyanide
Total phenolic compounds
Volatile organic compounds:
Acrolein
Acrylonitrile
Benzene
Bromoform
Carbon tetrachloride
Chlorobenzene
Chlorodibromomethane
Chloroethane
2-chloroethylvinyl ether
Chloroform
Dichlorobromomethane
1,1-dichloroethane
1,2-dichloroethane
Trans-1,2-dichloroethylene
1,1-dichloroethylene
1,2-dichloropropane
1,3-dichloropropylene
Ethylbenzene
Methyl bromide
Methyl chloride
Methylene chloride
1,1,2,2-tetrachloroethane
Tetrachloroethylene
Toluene
1,1,1-trichloroethane
1,1,2-trichloroethane
Trichloroethylene
Vinyl chloride
Acid -extractable compounds:
P-chloro-m-cresol
2-chlorophenol
2,4-dichlorophenol
2,4-dimethylphenol
4,6-dinitro-o-cresol
2,4-dinitrophenol
2-nitrophenol
4-nitrophenol
Pentachlorophenol
Phenol
2,4,6-trichlorophenol
Base -neutral compounds:
Acenaphthene
Acenaphthylene
Anthracene
Benzidine
Benzo(a)anthracene
Benzo(a)pyrene
3,4 benzofluoranthene
Benzo(ghi)perylene
Benzo(k)fluoranthene
Bis (2-chloroethoxy)
methane
Bis (2-chloroethyl) ether
Bis (2-chloroisopropyl) ether
Bis (2-ethylhexyl) phthalate
4-bromophenyl phenyl ether
Butyl benzyl phthalate
2-chloronaphthalene
4-chlorophenyl phenyl ether
Chrysene
Di-n-butyl phthalate
Di-n-octyl phthalate
Dibenzo(a, h)anth racene
1,2-dichlorobenzene
1,3-dichlorobenzene
1,4-dichlorobenzene
3,3-dichlorobenzidine
Diethyl phthalate
Dimethyl phthalate
2,4-dinitrotoluene
2,6-dinitrotoluene
1,2-diphenylhydrazine
Fluoranthene
Fluorene
Hexachlorobenzene
Hexachlorobutadiene
Hexachlorocyclo-pentadiene
Hexachloroethane
I ndeno(1,2,3-cd)pyrene
lsophorone
Naphthalene
Nitrobenzene
N-nitrosodi-n-propylamine
N-nitrosodimethylamine
N-nitrosodiphenylamine
Phenanthrene
Pyrene
1,2,4-trichlorobenzene
Test results shall be reported to the Division in DWQ Form- DMR-PPA1 or in a form approved
by the Director, within 90 days of sampling. A copy of the report shall be submitted to Central
Files to the following address: Division of Water Quality, Water Quality Section, 1617 Mail
Service Center, Raleigh, North Carolina 27699-1617. This submittal must also be included
with the next permit renewal application form.

DENR/DWQ
FACT SHEET FOR NPDES PERMIT DEVELOPMENT
NPDES No. NC0020648
Facility Information
Applicant/Facility Name:
City of Washington
Applicant Address:
P.O. Box 1988, Washington, NC 27889
Facility Address:
1399 West 2nd Street, Washington, NC 27889
Permitted Flow (MGD):
3.65
Type of Waste:
99% Domestic <1% Industrial
Facility Classification:
IV
Permit Status:
Renewal
County:
Beaufort
Miscellaneous
Receiving Stream:
Tar River
Stream index
28-(102.5)
Stream Classification:
C-NSW
Regional Office:
Washington
303(d) Listed?
Yes
State Grid / USGS Quad:
E30SE/Washington
TMDL?
Yes
Permit Writer:
Gil Vinzani
Basin/Subbasin:
Tar -Pam / 030307
Date:
April 8, 2010
Drainage Area (mi2):
Tidal
--
•
__.
Lat. 35° 32' 54" N Long. 77° 04' 21" W
Summer 7Q10 (cfs)
Winter 7Q10 (cfs):
30Q2 (cfs)
Average Flow (cfs):
IWC (%):
N/A
Summary: The City of Washington submitted a permit renewal application to the Division on
June 2, 2009. The city has a permit for reuse of treated effluent (WQ0019179). They reuse an
average of 211 gallons per day on land near the wastewater plant. Additionally, they participate as
a member in the Tar -Pamlico River Basin Association. Note that the issuance of this permit
renewal, similar to other Association members, was delayed for several months due to a legal issue
concerning the enforceability of nutrient reductions.
Pre -Treatment: The city has an approved pretreatment program with 3 Sills. These are
Stanadyne Automotive, with a process wastewater flow of 20,250 GPD, Flanders Filters Inc, 16,950
GPD, and Spencer Packing Co., with a process wastewater flow of 950 GPD.
Compliance Review: Data from BIMS indicates that the only limits violation during this review
period (2006-2009) occurred in October of 2007. There was an exceedance of the daily maximum
for total residual chloride. It should be noted that the Tar River is listed as impaired for chlorophyll -
a, and also in the fish consumption category because fish tissue samples exceeded the criterion of
methyl mercury per gram of fish tissue. Mercury is a statewide issue.
DMR Review: For 2008, flow averaged 1.50 MGD; BOD averaged < 2.0 mg/I; and Total
Suspended Residue averaged < 2.5 mg/I. Other 2008 effluent data: TRC: <20,ug/L; NH3-N; <0.05
mg/L; TN: 1.07 mg/L; TP: 1.25 mg/L; DO: 7.4 mg/L; and Fecal Coliform: <2/100 mL.
Effluent Toxicity: The permit requires quarterly acute toxicity testing at 90%. The city has passed
every toxicity test from 2005 until the present.
Fact Sheet
NPDES NC0020648

Nutrient Controls:
History and Status of Nutrient Management Strategy for Point Sources.
On September 12, 1989, the Environmental Managements Commission classified the Tar -Pamlico
River Basin as Nutrient Sensitive Waters (NSW). On February 13, 1992, the Commission approved
a revised NSW Implementation Strategy that established the framework for a nutrient reduction
trading program between point and nonpoint sources of pollution. The Strategy also established
certain conditions to be met by an association of dischargers known as the Tar -Pamlico Basin
Association (the Association). Those conditions are defined in the Tar -Pamlico Nutrient Sensitive
Waters Implementation Strategy (the "Agreement").
The Association agreed to meet specific conditions in order to have the opportunity both to pursue
alternative approaches to managing its nutrient discharges and to reduce nutrient loading in the
most cost-effective manner, including the option to fund agricultural best management practices
(BMPs). These conditions included the development of an estuarine hydrodynamic computer
model, engineering evaluations of wastewater treatment plants, annual monitoring reports on
nutrient loading, and minimum payments for the administration and implementation of agricultural
BMPs. The Association met all conditions established in Phase I.
The Phase I Agreement set collective, technology -based discharge loading limits for the
Association in the form of an annually decreasing, combined nitrogen and phosphorus cap. During
the 1990 to 1991 period, low cost operational changes were implemented at several facilities to
reduce nitrogen loadings. The engineering evaluation of member facilities and implementation of
the study's recommended nutrient removal improvements also yielded significant loading
reductions. These changes, combined with installation of nutrient removal at several of the larger
facilities, allowed the Association to reduce its nutrient loads and stay beneath its caps throughout
Phase I.
The Phase II Agreement spanned ten years from January 1995 through December 2004. Modeling
of the Pamlico River estuary during Phase I provided a foundation for water quality -based loading
goals for Phase II. Based on the estuary modeling, Phase II established overall performance goals
for the nutrient strategy of 30 percent reduction in nitrogen loading from a baseline year of 1991
and no increase in loading of phosphorus from that baseline. Based on these goals, it also
established nitrogen and phosphorus discharge loading caps for the Association. These caps also
accounted for the load reductions achieved through operational changes implemented during the
1990/1991 period. The Association stayed beneath both caps throughout Phase II, steadily
reducing its loading of both nutrients despite steady increases in flow. Overall, from 1990 through
2003, the Association decreased nitrogen loads to the river by approximately 45% and phosphorus
loads by over 60%, while flows increased approximately 30%. The attached table summarizes caps
and loads through 2008. The success of this collective cap approach may be attributed in part to
the element of time it provided for individual facilities to implement nutrient removal as it became
most cost-effective for them.
Phase II also established requirements for non -Association point source dischargers and called for
rulemaking to fully enact those requirements. That rulemaking became effective in April 1997. It
required new and expanding dischargers over certain sizes to meet effluent concentration limits and
to fully offset new or increased loads using the same offset approach developed for the
Association. During Phase II, there were no new dischargers to the basin, and no existing
dischargers became subject to the rule's requirements.
Phase II also established instream nutrient goals for nonpoint sources and called for a separate
nonpoint source (NPS) strategy. These were used to establish a nutrient TMDL, which was
approved by the USEPA on August 10, 1995.
Fact Sheet
NPDES NC0020648

The NPS strategy was put into effect in January 1996 as a voluntary effort that would work from
existing programs, seeking additional funds and developing accounting tools. After two years of
voluntary implementation, the EMC found progress insufficient and initiated nonpoint source
rulemaking. Rules were fashioned after those recently adopted in the adjacent Neuse River basin.
They addressed riparian buffer protection, agriculture, urban stormwater, and fertilizer
management. The rules became effective during 2000 and 2001 and are currently in various stages
of implementation.
Phase III of this Agreement was approved by the EMC on April 14, 2005. It spans an additional ten
years through December 31, 2014. This third phase continues the structure established in Phase II
including overall performance goals for the nutrient strategy of 30 percent reduction in nitrogen
loading from a baseline year of 1991 and no increase in loading of phosphorus from that baseline.
The Phase III Agreement updated Association membership and related nutrient caps. It proposed
action in the first two years to improve the offset rate, resolve related temporal issues, and revisit
alternative offset options. The parties to the Agreement met several times during the first four years
of the Agreement to work on addressing these action items and came to agreement on issues
related to banked credit and credit life.
In 2006 DWQ contracted the NCSU Water Quality Group to estimate the cost-effectiveness of
agricultural BMPs to use for updating the nitrogen offset rate in the Agreement and to establish a
phosphorus offset rate. As a result of the study, the parties to the Agreement indentified actions to
be taken by the conclusion of Phase III and addressed in the Phase IV Agreement:
1. Evaluate whether the Agricultural Cost Share Program continues to provide the most
efficient vehicle to implement the pollution credits trading program. This evaluation should
consider the effect of delays in BMP implementation relative to nutrient cap exceedance and
how such delays may impact the allowable point source nutrient budget.
2. Evaluate the trading offset credit cost calculation method to ensure the offset rate reflects all
actual costs incurred in program development and implementation and reflects the costs of
the type of agricultural BMPs implemented through this program.
3. Conduct a water quality trend analysis, including evaluation of TN losses occurring during
transport to the estuary. This analysis will inform the parties regarding the need for changes
in acceptable loads and the relative impacts of point and non -point contributions.
Fact Sheet
NPDES NC0020648

•
Nutrient Limits:
Point source dischargers in the Tar -Pamlico River Basin are subject to the terms and conditions of
the Agreement and to the nutrient TMDL developed for the Basin. The Agreement provided a cost-
effective alternative to uniform technology -based nutrient concentration limits. It later added
elements of the TMDL, including estuary loading goals and point and nonpoint source allocations.
As of December 2009, the Association consists of fifteen members. The member facilities are listed
in the following table, and their locations are shown on the attached map.
Membership of Tar -Pamlico Basin Association
Permit
Owner
Facility
NC0030317
City of Rocky Mount
Tar River Regional WWTP
NC0023931
Greenville Utilities Commission
GUC WWTP
NC0020605
Town of Tarboro
Tarboro WWTP
NC0025054
City of Oxford
Oxford WWTP
NC0020648
City of Washington
Washington WWTP
NC0069311
Franklin County
Franklin County WWTP
NC0020834
Town of Warrenton
Warrenton WWTP
NC0026042
Town of Robersonville
Robersonville WWTP
NC0020231
Town of Louisburg
Louisburg WWTP
NC0026492
Town of Belhaven
Belhaven WWTP
NC0025402
Town of Enfield
Enfield WWTP
NC0023337
Town of Scotland
Neck Scotland Neck WWTP
NC0020061
Town of Spring Hope
Spring Hope WWTP
NC0020435
Town of Pinetops
Pinetops WWTP
NC0042269
Town of Bunn
Bunn WWTP
The nitrogen and phosphorus caps for the Association are defined in the Phase III Agreement as
follows:
Phase III Nutrient Caps — Tar -Pamlico Basin Association'
Total Nitrogen
Total Phosphorus
(Ib/yr)
(kg/yr)
(Ib/yr)
(kg/yr)
891,272
404,274
161,070
73,060
1 Includes allowed adjustment to the 1991 baseline
The Agreement further provides that the Association may accrue and bank nitrogen credits by
funding nonpoint source nutrient reduction measures (e.g., agricultural BMPs) and that it may
purchase credits or apply banked credits in anticipation of future cap exceedances. The current
Agreement specifies that the Association holds offset credits in the following amounts:
Fact Sheet
NPDES NC0020648

Nitrogen Offset Credits — Tar -Pamlico Basin Association
Nitrogen Credits
Timeframe
(lb)
(kg)
Phase I
10,138
4,608
Phase II
30,276
13,762
Phase III
10,564
4,802
The Association has consistently and reliably kept its nutrient loadings beneath the caps without
relying on banked credits. By calendar year 2008, the group had reduced its Toads to 63% of its
nitrogen cap and 60% of the phosphorus cap.
Since the Tar -Pamlico strategy's inception, the EPA has praised the strategy for its innovative and
integrative approach to nutrient management and has touted it repeatedly as a model for others to
use. However, guidance released by the EPA's Office of Water Management in 2007 re -iterates
that federal NPDES regulations (40 C.F.R. 122.44(d)(1)) and Section 301(b)(1)(C) of the federal
Clean Water Act require that NPDES permits include any applicable limitations established in or
based upon an approved TMDL. The Tar -Pamlico permits have not included nutrient limits,
because the Agreement specified the Association's caps and, until recently, the EPA Region 4
office had accepted that approach. In light of the 2007 guidance, Region 4 has modified its position
on the matter and is requiring that the members' permits include the group nutrient limits at this
time and individual limits in 2014.
Therefore, the Division proposes at this time to include the Phase III nutrient caps as enforceable
permit limits in the members' individual permits. These limits, like the caps, apply to the aggregate
discharge of nitrogen and phosphorus by the Association members as a group.
In order to establish individual nutrient limits by 2014, the Division must conduct additional technical
studies (e.g., determine delivery rates for each discharger, develop individual N and P allocations)
and work with the Association to complete major revisions to the Tar -Pamlico strategy and the
Agreement. It is also likely that the Division must adopt rules to provide for the operation of the
Association under a group NPDES permit.
Annual Nutrient Loads And Caps, Tar -Pamlico Basin Association
Phase I
Combined
19911
19921
19931
19941
N+P
Loading Cap a
N (kg/yr)
525,00
500,00
475,000
425,000
0
0
Actual Load
N (kg/yr)
461,39
436,12
417,217
371,200
4
8
% of Cap
N
88
87
88
87
Average Daily
Flow (MGD)
24.88
26.86
28.46
26.65
Fact Sheet
NPDES NC0020648

Phase II
Se • arate
19952
19962
19972
19982
19992
20002
20013
20024
20034
20044•
20055
2006
2007
2008
N,P
Loading
Cap a
405,256
405,256
405,256
405,256
405,256
405,256
421,972
426,782
426,782
426,782
404,274
404,274
404;274
404,274
N (kg/yr)
P (kg/yr)
69,744
69,744
69,744
69,744
69,744
69,744
73,060
73,694
73,694
73,694 .
73,060
73,060
73,060
73,060
Actual
Load
372,582
354,219
320,670
344,781
309,476
297,988
279,958
279,330
309,724
256,791*
242,020
232,568
•
246,465
253,818
N (kg/yr)
P (kg/yr)
37,360
43,266
36,532
36,864
32,052
30,277
32,730
34,076
30,856
33,566*
39,267
46,995
50,077
43,821
%of
Cap
92
87
79
85
76
74
66
65
72
60*
60
58
61
63
N
P
54
62
52
53
46
43
45
46
42
45*
54
64
69
60
Average
Daily
Flow
31.03
33.57
29.84
33.31
33.39
32.74
30.21
30.54
36.86
29.56
29.21
32.85
27.05
27.39
(MGD)
'
Loads were estimated by NC Division of Water Quality as the sum of calendar -year monthly Toad values for each facility. which are based on
minimum biweekly nutrient concentrations and daily mass flows.
a Cap values and changes result from the following:
1. Phase I - Original 12-member Association.
2. Phase II through 2000 - 14-member Association.
3. Robersonville added in 2001, making a 15-member Association.
4. Scotland Neck added in 2002, making a 16-member Association.
5. National Spinning Removed in 2005, making a 15 member Association in Phase III

Reasonable Potential Analysis: The discharge is to tidal waters; therefore no reasonable potential
analysis was performed for chronic criteria. Acute criteria were compared to the maximum reported
values. Values for zinc and copper exceeded the standard. Due to the city's excellent toxicity
compliance record (see below), monitoring will remain in the permit at the same frequency. The
values for chromium and lead from the PPAs in the application were below the acute criteria.
Regarding the data from the LTMP, the Pretreatment Unit indicated that all available data for this
renewal period was to be found only on the DMRs. Data for cadmium, chromium, nickel, cyanide,
lead, copper, zinc, silver, mercury, selenium, and molybdenum was available on a monthly basis.
All data was input to the RPA sheets. Copper and Zinc were the only two parameters to have a
reasonable potential; and as action level parameters they will continue to be monitored monthly.
Priority Pollutant Scan: The city performed three priority pollutant scans as part of the application
process. Because of one hit in the PPA, bis (2-ethylhexyl) phthalate will be limited. The sample
reading of 20.89 ug/L was well above the human health standard of 2.2 ug/L. Additionally,
although some hits above the detection level were seen for chloroform and dibromochloromethane,
but these did not show a reasonable potential to exceed the human health standard.
SUMMARY OF PROPOSED ADDITIONS
1. Bis (2-ethylhexyl) phthalate monitoring with limits. The priority pollutant analysis sampling
results contained an exceedance above the human health standard.
2. A special condition for nutrient reduction. All members of the Tar -Pamlico Association
receive this special condition regarding nutrient limits and enforceability.
3. TKN and Nitrite -Nitrate monthly composite sampling, following the strategy for Association -
member renewals in the Tar -Pamlico basin.
4. A footnote to the limit for total residual chlorine. The Division now allows a 50 ,ug/L TRC
compliance level. You must report actual results on DMR submittals, but for compliance
purposes, all TRC values below 50 pg/L will be deemed compliant.
Note on Bis (2-ethylhexyl) phthalate limits:
After discussions with Kent Wiggins in the ESS Laboratory Unit, there is a possibility that the Bis
(2-ethylhexyl phthalate sample result outlier was due to sampling or handling contamination. After
consideration and discussion with the Complex Permitting Unit, it was decided that a conditional
limit, as written in the draft permit, should be kept. After 12 months of sampling, the permittee can
request to rescind this limit if justified.
Proposed schedule for Permit Issuance:
Draft Permit to Public Notice:
Permit Scheduled to Issue:
April 14, 2010
June, 2010
NPDES Division Contact:
If you have questions regarding any of the above information or on the attached permit, please
contact Gil Vinzani at [phone] or [e-mail].
NAME:
Ay/ 3,
DATE: 6.-I/-2o10
REGIONAL OFFICE COMMENTS ATTACHED
Fact Sheet
NPDES NC002061S

REASONABLE POTENTIAL ANALYSIS
City of Washington WWTP
NC0020648
Time Period Tidal
Ow (MGD) 3.65
7Q10S (cfs) 0
7010W (cfs) 0
3002 (cfs) 0
Avg. Stream Flow, QA (cfs) 0
Rec'ving Stream Tar River
WWTP Class IV
IWC (%) @ 7010S 100
Cr 7010W N/A
@ 3002 N/A
QA N/A
Stream Class C-NSW
Outfall 001
Qw=3.65MGD
PARAMETER
TYPE
(1)
STANDARDS &
CRITERIA (2)
POL
Units
REASONABLE POTENTIAL RESULTS
RECOMMENDED ACTION
NC WOW
Chrot*
i4FAY /
Mob
n
nDot Max Prod Cw AAowabbCw
Arsenic
C
50
ug/L
28
0
2.5
Acute: N/A
_ _ _ _ _
No RP, Ail sample results non -detect
Beryllium
C
6.5
ug/L
0
0
N/A
Acute: N/A
_ _
Chronic: A/aUEI
—"-------- --- ---- ---------- --•—
Cadmium
NC
2
15
ug/L
28
0
0.5
Acute: 15
_
Cronic: - — - 2---
hAcute:
No RP, All sample results non -detect
—_.—.—.—_—_—.—_.——_ _—.—.—_—_—
——_—
Chromium
NC
50
1,022
ug/L
31
3
10.2
1,022
Chronic: ---50 -------
No RP
—
Copper
NC
7
AL
7.3
ug/L
58
58
10.8
Acute:—.—.—.—
Acute:-----
Acute: 7
_.— —•
Max Predicted value exceeds standard. Continue monitorir
for this actio4level parameter ----_---_— _—
�------ — -
Cyanide
NC
5
N
22
10
ugft.
28
0
5.0
Acute: 22
No RP
---•-------------------------
Fluoride
NC
1,800
ug/L
0
0
WA
Acute: WA
_
Chro_mic: 1,800 -
—.--------- ---"-------------_—.—
Lead
NC
25
N
33.8
uglL
31
4
10.6
Acute: 34
NO RP; no monitoirng
Mercury
NC
12
2.0000
ng1L
21
10
7.8750
Acute: NIA
Chronic: "12---------------
No RP
-
Molybdenum
A
3,500
ug/L
28
2
17.4
Acute: NIA WA
Chron_
ic: 8VALUEI
No RP. Human health standard is 2000ug'L
__—.—.—•—_—_------_ _---------
—.
Nickel
NC
88
261
ugR.
28
0
5.0
Acute: 261
No RP
—.—_—.-------------------------.—
Phenols
A
1
N
ug/L
0
0
N/A
Acute: N/A
_i(ALUEI
Chronic:
------------------------------
Selenium
NC
5.0
56
ug/L
28
0
5.0
' Acute: 56
Chroni_c: --- 5---
No RP
---------------.—_—_——.—_—.—.—.—
Silver
NC
0.06
AL
1.23
ugfL
28
0
2.5
Acute: 1
All sample results non -detect
-------------•—•-----------------
Zinc
NC
50
AL
67
ug/L
70
70
239.9
Acute: 67
_ _ _ 5--
Chronic. --50— -
Max predicted value exceeds standard; continue monitoims
for this actio-level parameter ___ -----------•—
-----------------
• Legend.
C = Carcinogenic
NC = Non -carcinogenic
A = Aesthetic
'• Freshwater Discharge
Washington rpa 20648, rpa
6/11/2010

REASONABLE POTENTIAL ANALYSIS
1
Arsenic
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
Date Data BDL=1/2DL Results
< 5.0 2.5 Std Dev. 0.0000
< 5.0 2.5 Mean 2.5000
< 5.0 2.5 C.V. 0.0000
< 5.0 2.5 n 28
< 5.0 2.5
< 5.0 2.5 Mult Factor = 1.0000
< 5.0 2.5 Max. Value 2.5 ug/L
< 5.0 2.5 Max. Pred Cw 2.5 ug/L
< 5.0 2.5
. < 5.0 2.5
< 5.0 2.5
:.< 5.0 2.5
<- 5.0 2.5
< 5.0 2.5
< 5.0 2.5
< 5.0 2.5
< 5.0 2.5
<- 5.0 2.5
< 5.0 2.5
< 5.0 2.5
< 5.0 2.5
< 5.0 2.5
-<- 5.0 2.5
<- 5.0 2.5
< 5.0 2.5
< 5.0 2.5
<. 5.0 2.5
< 5.0 2.5
Washington rpa 20648, data
- 1 • 6/11/2010

REASONABLE POTENTIAL ANALYSIS
4
Cadmium
Chromium
Date Data BDL=1/2DL Results
< 1 0.5 Std Dev. 0.0000
1 0.5 Mean 0.5000
1 0.5 C.V. 0.0000
<1 0.5 n 28
<` 1 0.5
< 1 0.5 Mult Factor = 1.0000
1 0.5 Max. Value 0.5 ug/L
< 1 0.5 Max. Pred Cw 0.5 ug/L
< 1 0.50
1 0.50
< 1 0.50
e 1 0.50
< 1 0.50
<, 1 0.50
• 1 0.50
<.. 1 0.50
< 1 0.50
<. 1 0.50
< 1 0.50
. <- 1 0.50
< 1 0.50
<; 1 0.50
<; 1 0.50
< 1 0.50
c 1 0.50
••<. 1 0.50
1 0.50
'< 1 0.50
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
Data
BDL=1/2DL Results
7 7.0 Std Dev. 0.8082
2.5 2.5 Mean 2.6452
2.5 2.5 C.V. 0.3055
5 2.5 n 31
5 2.5
5 2.5 Mult Factor = 1.4500
5 2.5 Max. Value 7.0 ug/L
5 2.5 Max. Pred Cw 10.2 ug/L
5 2.5
5 2.5
5 2.5
5 2.5
5 2.5
5 2.5
5 2.5
< .; 5 2.5
< 5 2.5
5 2.5
< 5 2.5
< : 5 2.5
< 5 2.5
< 5 2.5
• 5 2.5
<. 5 2.5
<_ 5 2.5
<1 5 2.5
< : 5 2.5
5 2.5
5 2.5
5 2.5
5 2.5
Washington rpa 20648, data
- 1 - 6/11/2010

REASONABLE POTENTIAL ANALYSIS
6
Copper
Cyanide
Date Data
BDL=1/2DL Results
2. 2.0 Std Dev.
2. 2.0 Mean
2. 2.0 C.V.
n
Mult Factor =
3. 3.0 Max. Value
2. 2.0 Max. Pred Cw
6. 6.0
2. 2.0
2. 2.0
2. 2.0
2. 2.0
2. 2.0
2. 2.0
2. 2.0
2. 2.0
5. 5.0
6. 6.0
5. 5.0
6. 6.0
3. 3.0
2. 2.0
3. 3.0
5. 5.0
4. 4.0
4. 4.0
2. 2.0
5. 5.0
6. 6.0
1.5 1.5
1.5 1.5
1.5 1.5
1.5 1.5
1.5 1.5
1 1.0
1 1.0
1 1.0
1 1.0
t 1.0
1 1.0
1 1.0
1 1.0
1 1.0
1 1.0
1 1.0
t 1.0
1 1.0
1 1.0
1 1.0
1 1.0
1 1.0
1 1.0
1 1.0
1 1.0
1.5533
2.1121
0.7354
58
1.8000
6.0 ug/L
10.8 ug/L
Date Data BDL=1/2DL Results
1 < 5 5.0 Std Dev. 0.0000
2 < 5 5.0 Mean 5.0000
3 < 5 5.0 C.V. 0.0000
4 < 5 5.0 n 28
5 <1 5 5.0
6 .<. 5 5.0 Mult Factor= 1.0000
7 < 5 5.0 Max. Value 5.0
8 < 5 5.0 Max. Pred Cw 5.0
9 < 5 5.000
10 < 5 5.000
11 ' < 5 5.000
12 <5 5.000
13 < 5 5.000
14 < 5 5.0
15 <' 5 5.0
16 <, 5 5.0
17 < 5 5.0
18 < 5 5.0
19 < 5 5.0
20 < 5 5.0
21 < 5 5.0
22 < 5 5.0
23 < 5 5.0
24 < 5 5.0
25 < 5 5.0
26 e 5 5.0
27 <`' 5 5.0
28 < 5 5.0
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
Washington rpa 20648, data
- 1 - 6/11/2010

REASONABLE POTENTIAL ANALYSIS
9
Lead
Mercury
Date Data BDL=1/2DL Results
1.5 1.5 Std Dev. 0.8790
1.5 1.5 Mean 2.5484
1.5 1.5 C.V. 0.3449
< 5 2.5 n 31
< 5 2.5
< 5 2.5 Mult Factor = 1.5100
< 5 2.5 Max. Value 7.0 ug/L
< 5 2.5 Max. Pred Cw 10.6 ug/L
< 5 2.5
< 5 2.5
< 5 2.5
< 5 2.5
< 5 2.5
< 5 2.5
< 5 2.5
< 5 2.5
< 5 2.5
< 5 2.5
< 5 2.5
< 5 2.5
< 5 2.5
< 5 2.5
< 5 2.5
< 5 2.5
< 5 2.5
< 5 2.5
< 5 2.5
< 5 2.5
< 5 2.5
< 5 2.5
Oct-2008 7 7.0
Date Data BDL=1/2DL Results
1 Apr-2010 < 1 1.0 Std Dev. 0.6591
2 Mar-2010 1.3 1.0 Mean 1.2319
3 Feb-2010 1.1 1.0 C.V. 0.5350
4 Jan-2010 1.7 1.0 n 21
5 Dec-2009 <: 1 1.0
6 Nov-2009 <1 1.0 Mult Factor= 2.10
7 Oct-2009 1.3 1.0 Max. Value 3.8 ng/L
8 2 2.0 Max. Pred Cw 7.9 ng/L
9 < 1.0 1.0
10 < 1 1.0
11 < 1 1.0
12 < 1 1.0
13 < 1 1.0
14 < 1 1.0
15 < 1 1.0
16 < 1 1.0
17 3.8 3.8
18 1.6 1.0
19 1.6 1.0
20 1.3 1.0
21 2.1 2.1
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
Washington rpa 20648, data
- 1 - 6/11/2010

REASONABLE POTENTIAL ANALYSIS
11
Molybdenum
Nickel
Date Data BDL=1/2DL Results Date Data BDL=1/2DL Results
< 10 5.0 Std Dev. 1.60 1 < 10 5.0 Std Dev. 0.0000
< 10 5.0 Mean 5.43 2 < 10 5.0 Mean 5.0000
< 10 5.0 C.V. 0.29 3 < 10 5.0 C.V. 0.0000
< 10 5.0 n 28 4 < 10 5.0 n 28
< 10 5.0 5 <;; 10 5.0
< 10 5.0 Mult Factor = 1.4500 6 10 5.0 Mult Factor = 1.0000
< 10 5.0 Max. Value 12.0 ug/L 7 < 10 5.0 Max. Value 5.0 ug/L
< 10 5.0 Max. Pred Cw 17.4 ug/L 8 <, 10 5.0 Max. Pred Cw 5.0 ug/L
< 10 5.0 9 <.i 10 5.0
< 10 5.0 10 <' 10 5.0
< 10 5.0 11 < 10 5.0
< 10 5.0 12 < 10 5.0
< 10 5.0 13 < 10 5.0
< 10 5.0 14 <. 10 5.0
< 10 5.0 15 <ii 10 5.0
< 10 5.0 16 < 10 5.0
< 10 5.0 17 < 10 5.0
< 10 5.0 18 < 10 5.0
< 10 5.0 19 < 10 5.0
< 10 5.0 20 <. 10 5.0
< 10 5.0 21 <10 5.0
< 10 5.0 22 <: 10 5.0
< 10 5.0 23 < 10 5.0
• 10 5.0 24 <. 10 5.0
< 10 5.0 25 <,, 10 5.0
< 10 5.0 26 .<k 10 5.0
May-2009 10.0 10.0 27 10 5.0
Apr-2009 12.0 12.0 28 10 5.0
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
Washington rpa 20648, data
- 1 - 6/11/2010

REASONABLE POTENTIAL ANALYSIS
14
Selenium
Silver
Date Data BDL=1/2DL Results
< 10 5.0 Std Dev.
< 10 5.0 Mean
< 10 5.0 C.V.
< 10 5.0 n
< 10 5.0
< 10 5.0 Mult Factor =
< 10 5.0 Max. Value
< 10 5.0 Max. Pred Cw
< 10 5.0
< 10 5.0
< 10 5.0
< 10 5.0
< 10 5.0
< 10 5.0
<' 10 5.0
<. 10 5.0
< 10 5.0
<. 10 5.0
< 10 5.0
< 10 5.0
• 10 5.0
< 10 5.0
< 10 5.0
< 10 5.0
<, 10 5.0
• < 10 5.0
< 10 5.0
<: 10 5.0
0.0000 1
5.0000 2
0.0000 3
28 4
5
1.0000 6
5.0 ug/L 7
5.0 ug/L 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
Date Data BDL=1/2DL Results
< 5 2.5 Std Dev. 0.0000
< 5 2.5 Mean 2.5000
< 5 2.5 C.V. 0.0000
<_ 5 2.5 n 28
< 5 2.5
'<' 5 2.5 Mult Factor = 1.0000
< 5 2.5 Max. Value 2.5 ug/L
< 5 2.5 Max. Pred Cw 2.5 ug/L
< 5 2.5
< 5 2.5
< 5 2.5
< 5 2.5
< 5 2.5
< 5 2.5
< 5 2.5
< 5 2.5
< 5 2.5
< 5 2.5
< 5 2.5
< 5 2.5
< 5 2.5
<. 5 2.5
< 5 2.5
< 5 2.5
< 5 2.5
< 5 2.5
< 5 2.5
<. 5 2.5
Washington rpa 20648. data
1 - 6/11/2010

REASONABLE POTENTIAL ANALYSIS
15
Zinc
Date Data
BDL=1/2DL Results
34, 34.0 Std Dev. 18.9566
51. 51.0 Mean 50.9543
58. 58.0 C.V. 0.3720
52. 52.0 n 70
43. 43.0
40. 40.0 Mult Factor = 1.3400
51. 51.0 Max. Value 179.0
44. 44.0 Max. Pred Cw 239.9
56. 56.0
28. 28.0
52. 52.0
58. 58.0
45. 45.0
47. 47.0
59. 59.0
69. 69.0
52. 52.0
32. 32.0
43. 43.0
47. 47.0
25. 25.0
45. 45.0
54. 54.0
50. 50.0
54. 54.0
51. 51.0
60. 60.0
2.5 2.5
52. 52.0
46. 46.0
65. 65.0
60. 60.0
62. 62.0
48. 48.0
68.3 68.3
52. 52.0
179. 179.0
52. 52.0
49. 49.0
35. 35.0
57. 57.0
49. 49.0
46. 46.0
49. 49.0
49. 49.0
61. 61.0
69. 69.0
52. 52.0
57. 57.0
60. 60.0
38. 38.0
53. 53.0
54. 54.0
43. 43.0
44. 44.0
34 34.0
51 51.0
58 58.0
52 52.0
43 43.0
40 40.0
51 51.0
44 44.0
56 56.0
28 28.0
52 52.0
58 58.0
Washington rpa 20648, data
- 1 - 6/11/2010

Vinzani, Gil
From: [e-mail]
Sent: Thursday, April 22, 2010 4:23 PM
To: Vinzani, Gil
Subject: re NC0020648, Washington Regional WWTP
EPA has no comments on this draft permit.
1

BEAUFORT COUNTY
NORTH f AROLINA
AFFIDAVIT OF PUBLICATION
Before the undersigned, a Notary Public of said County
and State, duly commissioned, qualified and authorized
by law to administer oaths. personally appeared
tscry)rYle F�-I ov- , who being first duly
sworn as a representative of the Washington Daily
News. a newspaper, published, issued and entered as
second class mail in Washington, NC in said county and
state and 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 ashington Daily News on the following dates:
lio an 6
and that the said newspaper in which such notice, paper,
document, or legal advertisement was published was, at
the time of each and every publication, a newspaper
meeting all of the requirements and qualifications of
Section I-597 of the General Statutes of North Carolina
and was a qualified newspaper within the meaning of
Section I-597 of the General Statutes of North Carolina.
This 30 day of
,20j.
67_e.i idJGi
(Signature of person making affidavit)
Sworn to and subscribed before me, a Notary Public,
this day of , 20 / 0 .
► r' \ (Notary Public)
My commission expires jc)C / �.
Publication cost $ paid.
PUBLIC NOTICE
North Carolina Environmental Man-
agement Commission/NPDES Unit
1617 Mail 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 dis-
charge permit to the person(s) listed
below.
Written comments regarding the pro-
posed permit will be accepted until
30 days after the publish date of this
notice. The Director of the NC Divi-
sion of Water Quality (DWQ) may
hold a public hearing should there
be a significant degree of public in-
terest. Please mail comments and/or
information requests to DWQ at the
above address. Interested persons
may visit the DWQ at 512 N. Salis-
bury Street, Raleigh, NC to review
information on file. Additional infor-
mation on NPDES permits and this
notice may be found on our website:
www.ncwaterquality.org, or by call-
ing [phone].
The City of Washington, NPDES
Permit No NC0020648, has applied
for renewal of its permit to discharge
treated wastewater to the Tar River
in the Tar -Pamlico River Basin. This
discharge may affect future alloca-
tions to this portion of the receiving
stream.
4.161tc •

NPDES/Aquifer Protection Permitting Unit Pretreatment Information Request Form
PERMIT WRITER COMPLETES THIS PART:
PERMIT WRITERS - AFTER you get this form
Check that
back from PERCS:
all apply
- Notify PERCS if LTMP/STMP data we said should
Date of Request
9/9/2009
municipal renewal
X
be on DMRs is not really there, so we can get it for
Requestor
Gil Vinzani
new industries
you (or NOV POTW).
Facility Name
City of Washington
WWTP expansion
- Notify PERCS if you want us to keep a specific
Permit Number
NC0020648
Speculative limits
POC in LTMP/STMP so you will have data for next
renewal.
ReRegion
g
Washington
9
stream reclass.
permit
- Email PERCS draft permit, fact sheet, RPA.
Basin
Tar -Pam
stream relocation
- Send PERCS paper copy of permit (w/o NPDES
7010 change
boilerplate), cover letter, final fact sheet. Email RPA
other
if changes.
other
check applicable
PERCS staff:
Other Comments to
PERCS:
CTB, CHO, LUM, NEW, ROA - Dana Foiley (523)
HIW, LTN, NEU, YAD - Monti Hassan (371)
X
BRD, CPF, FRB, TAR - Sarah Morrison (208)
PERCS
Status of
PRETREATMENT STAFF COMPLETES THIS PART:
Pretreatment Program (check all that apply)
1) facility has no SIU's, does have Division approved Pretreatment Program
that is INACTIVE
2) facility has no SIU's, does not have Division approved Pretreatment
Program
X
3) facility has Sills and DWQ approved Pretreatment Program (list "DEW
if program still under development)
X
3a) Full Program with LTMP
3b) Modified Program with STMP
4) additional conditions regarding Pretreatment attached or listed below
STMP time frame:
Most recent:
Flow, MGD
Permitted
Actual
Time period for Actual
Next Cycle:
Industrial
0.073
0.0413
Jan- Dec 2005
Uncontrollable
n/a
1.8991
POC In
LTMP/
STMP
Parameter of
Concern (POC)
Check List
POC due to
NPDES/ Non-
Disch Permit
Limit
Required
by EPA*
Required
by 503
Sludge"
POC due
to SIU'"
POTW POC
(Explain
below)""
STMP
Effluent
Freq
LTMP
Effluent
Freq
X
BOD
X
4
Q M
X
TSS
X
4
Q M
Q = Quarterly
X
NH3
X
4
Q M
M = Monthly
X
Arsenic
X
4
Q M
4
Cadntiiimi: =:_ .;
4
X
X
4
Q M
-4
Ghrornium .'- `
4
X
4
Q M
d
coy* .,_=:...:;
J
x
X
4
Q M
X
Cyanide
X
4
Q M
all data on DMRs?
4
Ledd . _-
4
X
X
4
Q M
YES
X
Mercury
X
4
Q M
NO (attach data)
X
X
Molybdenum
X
4
Q M
4
Nib_ ei ;; _
-4
X
X
4
Q M
X
Silver
X
4
Q M
X
Selenium
X
4
Q M
4
Zinc •
4
x
X
4
Q M
data in spreadsheet?
X
Total Nitrogen
4
Q M
YES (email to writer)
X
X
Phosphorus
4
Q M
NO
Oil & Grease
X
4
Q M
4
Q M
4
Q M
4
Q M
*Always in the LTMP/STMP " Only in LTMP/STMP if sludge land app or composte (dif POCs for incinerators)
"' Only in LTMP/STMP while SIU still discharges to POTW "" Only in LTMP/STMP when pollutant is still of concern to POTW
Comments to Permit Writer (ex., explanation of any POCs; info you have on IU related investigations into NPDES problems):
Washington PIRF September 2009
Revised: July 24, 2007

City of Washington
P.O. Box 1988, Washington, NC 27889-1988
May 28, 2008
Mrs. Dina Sprinkle
NCDENR Division of Water Quality
Point Source Branch
1617 Mail Service Center
Raleigh, NC 27699-1617
Subject: NPDES Permit Renewal Amendment
Permit No. NC0020648
Washington Regional Wastewater Treatment System
Dear Mrs. Sprinkle,
3-10
rr.ln . Ntr' OUAtIV
�A`(`�
C ' Ci V
The City of Washington is requesting renewal of its existing NPDES permit number
#NC0020648 of 3.65 MGD for treated wastewater discharge to the Tar river at
Washington, North Carolina. Enclosed please find one original signed permit application
packet and two copies of the same packet.
Thank you in advance for your consideration with this permit renewal. If you have any
questions about the information in this packet, please do not hesitate to call me at 252-
975-9310.
Respectfully Submitted
4a, (D,c.a--,
Adam Waters
Water Resources Superintendent
City of Washington
Cc File
Allen Lewis
Enclosure
102 E. Second St. • Telephone [phone] TDD 1-800-735-2962 • Fax [phone]

FACILITY NAME AND PERMIT NUMBER:
City of Washington Regional Wastewater
Treatment Plant, NC0020648
PERMIT ACTION REQUESTED:
Renewal
RIVER BASIN:
Tar -Pamlico
..PP M ENT.�'rJdwa�'t , ,R. 1, .A t O ` ,_ .. T':1. n r . � j{ftt;
-Pf ..: .9. y�� . .. A F�- _. ..wy ,�y �„ •xi. -..} ?�� $f Sn. �4. �. '�.�', e . o.�. '11 �S .':ol
: f .P,' r. �! :i"'?$d'sY•1. ..�. ("'.,.. `�. FF.. #=,r'a#k;.. _. Iy�.3ixpn
.a.�...n..r.. a'�.fi.F 4�.. Mte . �...,.d, xv, �lSi...'.C.<.. r. ..-. T-...e..��MnY�F'...:. 'i aYf ` 2ivrtiSi....-_err-.. ..-r .-.. � inlh
��.,J..� � r :a zf a� p S x F,LL ,
#.� % i T j..r. �sx �j LY f T ) f"^r. � `� � !S P' TRi.�_;., i'.
Pc t Sfri t7P 'h 'i�: "LS - N' <..
vYi��"•....l� � t, �`S �+ - . e...
e i<,...+.-_.r, <- ems. t L ..
: i — ti;r,.� .Y _s-.xy,. �. i1 � �w� > 5:..4 y.;:»i:.:' �.. f $
P� _ , F•I STRIA USERiDISCH ES AND .t 1WCERCLA; W -- _ _ .S =_
All treatment works receiving discharges from significant industrial users
complete part F.
GENERAL INFORMATION:
or which receive RCRA,CERCLA,
to, an approved pretreatment program?
Users (CIUs). Provide the number
or other remedial wastes must
of each of the following types of
questions F.3 through F.8 and
F.1. Pretreatment program. Does the treatment works have, or is subject
►2 Yes ❑ No
F.2. Number of Significant Industrial Users (SIUs) and Categorical Industrial
industrial users that discharge to the treatment works.
a. Number of non -categorical SIUs. 2
b. Number of ClUs. 1
SIGNIFICANT INDUSTRIAL USER INFORMATION:
Supply the following information for each SIU. If more than one SIU discharges to the treatment works, copy
provide the information requested for each SIU.
F.3. Significant Industrial User Information. Provide the name and address of each SIU discharging to the treatment works. Submit additional pages
as necessary.
Name: Flanders Filters Inc
Mailing Address: 531 Flanders Filters Road
Washington. NC 27889
F.4. Industrial Processes. Describe all the industrial processes that affect or contribute to the SIU's discharge.
Manufacture HEPA air filter media and filter units
F.5. Principal Product(s) and Raw Material(s). Describe all of the principal processes and raw materials that affect or contribute to the SIU's
discharge.
Principal product(s): HEPA filters
Raw material(s): Fiberglass, sulfuric acid. metals. wood and urethane
F.6. Flow Rate.
a. Process wastewater flow rate. Indicate the average daily volume of process wastewater discharge into
day (gpd) and whether the discharge is continuous or intermittent.
16.950 gpd ( continuous or yes intermittent)
the collection system in gallons per
into the collection system
b. Non -process wastewater flow rate. Indicate the average daily volume of non -process wastewater flow discharged
in gallons per day (gpd) and whether the discharge is continuous or intermittent.
None gpd ( continuous or intermittent)
F.7. Pretreatment Standards. Indicate whether the Sill is subject to the following:
a. Local limits ® Yes 0
No
No
b. Categorical pretreatment standards ■ Yes ®
If subject to categorical pretreatment standards, which category and subcategory?
EPA Form 3510-2A (Rev. 1-99). Replaces EPA forms 7550-6 & 7550-22.
Page 18 of 22

F.8. Problems at the Treatment Works Attributed to Waste Discharge by the SIU. Has the SIU caused or contributed to any problems (e.g.,
upsets, interference) at the treatment works in the past three years?
❑ Yes ® No If yes, describe each episode.
F.3. Significant Industrial User Information. Provide the name and address of each SIU discharging to the treatment works. Submit additional
pages as necessary.
Name: Stanadvne Automotive
Mailing Address: PO Box 1105
Washington. NC 27889
F.4. Industrial Processes. Describe all the industrial processes that affect or contribute to the SIU's discharge.
Manufacture assemble and test diesel fuel iniection equipment
F.5. Principal Product(s) and Raw Material(s). Describe all of the principal processes and raw materials that affect or contribute to the SIU's
discharge.
Principal product(s): Fuel filters and fuel injectors
Raw material(s): Aluminum ingot. Filter paper. powder metals and glass
F.6. Flow Rate.
a. Process wastewater flow rate. Indicate the average daily volume of process wastewater discharge into the collection system in gallons per
day (gpd) and whether the discharge is continuous or intermittent.
20.250 gpd ( continuous or ves intermittent)
b. Non -process wastewater flow rate. Indicate the average daily volume of non -process wastewater flow discharged into the collection system
in gallons per day (gpd) and whether the discharge is continuous or intermittent.
1.800 gpd ( continuous or intermittent)
F.7. Pretreatment Standards. Indicate whether the SIU is subject to the following:
a. Local limits
b. Categorical pretreatment standards
® Yes
❑ Yes
❑ No
® No
If subject to categorical pretreatment standards, which category and subcategory
F.8. Problems at the Treatment Works Attributed to Waste Discharge by the SIU. Has the SIU caused or contributed to any problems (e.g.,
upsets, interference) at the treatment works in the past three years?
❑ Yes No
If yes, describe each episode.
F.3. Significant Industrial User Information. Provide the name and address of each SIU discharging to the treatment works. Submit additional pages
as necessary.
Name: Spencer Packing Company
Mailing Address: PO Box 753
Washington. NC 27889
F.4. Industrial Processes. Describe all the industrial processes that affect or contribute to the SIU's discharge.
Manufacture fresh and cooked sausages
F.5. Principal Product(s) and Raw Material(s). Describe all of the principal processes and raw materials that affect or contribute to the SIU's
discharge.
Principal product(s): Fresh sausage. cooked sausage & franks
Raw material(s): Pork, beef. turkey spices and seasoning
F.6. Flow Rate.
EPA Form 3510-2A (Rev. 1-99). Replaces EPA forms 7550-6 & 7550-22.
Page 20 of 22

Property Boundary Maps
Map one shows the wastewater treatment plant property outlined in black. Ebb and flow
are also indicated on the map for the Tar River and Kennedy Creek.
Map two shows the wastewater treatment plant property shaded in black. The outfall
discharge point is marked with a red dot and labeled outfall 001.
Map three shows the contours around the plant structures.
Washington NPDES Renewal 2009 (NC0020648)

THIS MAP IS FOR ILLUSTRATION PURPOSES ONLY. --- --- (4,13A
PREPARED BY : CITY OF WASHINGTON
PUBLIC WORKS DEPARTMENT
TAR RIVER
NIX/ MI
WASTEWATER TREA7MEN7'PLANT
: r m,4o0'
Grrr;ar WWSHZNCIVN.Na
6/18/04
aEAorORr corft rr.Mc.
CITY OP WASHI NGTON
102 E. PUBLIC
DEPARTMENT C. 27889

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{
Plant Layout
This drawing represents the plant layout with all of the plant structures as well as the
force mains entering the plant along with the plants outfall shown. The plants generator is
shown on this drawing and is located just below and left of clarifier 1. This drawing is not
to scale.
Washington NPDES Renewal 2009 (NC0020648)

1112.1r'''
•

Liquid and Solids Flow Schematic
This drawing represents the liquid and solids flow through the plant. Pipe sizes are
indicated on the drawing. The average day flow for 2008 was 1.5 MGD at both the
influent and effluent ends of the plant. Of this an estimated 0.6 MGD flowed through
Oxidation Ditch 2 and Clarifier 4. An estimated 0.9 MGD flowed through oxidation ditch
1 and 0.3 MGD flowed through clarifiers 1, 2 and 3 each. The flows recombined ahead of
the filters and each of the 5 filters receive an estimated 0.3 MGD. The waste then flowed
to a dual cell chlorine contact chamber where each cell received approximately 0.75
MGD. This drawing is not to scale.
Washington NPDES Renewal 2009 (NC0020648)

gp

Sludge Management
Sludge is thickened in the sludge thicken tanks and stored in the sludge lagoons. Sludge
stabilization takes place in the sludge storage lagoons. Sludge is land applied under land
application permit #WQ0001026. Lime stabilization and final land application is
contracted.
s-1(16,a..,s690,_ L,�-
Stephen Adam Waters II
Washington NPDES Renewal 2009 (NC0020648)
May 26, 2009