NC0024201_Permit (Issuance)_20070612

NPDES DOCUMENT !;CANNING COVER SHEET
NPDES Permit:
NC0024201
Roanoke River WWTP
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Correspondence
Owner Name Change
Report
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
June 12, 2007
This document is printed on reuse paper - ighriore any
content on the re�rernee side

AITA
NCDENR
Michael F. Easley
Govemor
William G. Ross, Jr., Secretary
North Carolina Department of Environment and Natural Resources
Coleen H. Sullins, Director
Division of Water Quality
June 12, 2007
R. Danieley Brown
Roanoke Rapids Sanitary District (RRSD)
1000 Jackson Street, P.O. Box 308
Roanoke Rapids, North Carolina 27870
Subject: Issuance of NPDES Permit NC0024201
Roanoke Rapids Sanitary District WWTP
135 Aqueduct Road
Halifax County
Dear Mr. Brown:
The Division of Water Quality (the Division) hereby issues the attached NPDES permit for the subject
facility. We issue this permit 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, or as subsequently amended.
The Division has reviewed your comments on the draft permit dated May 14, 2007 and have corrected
several noted typographical errors. We also offer the following additional responses to your comments.
• Chronic Toxicity — 2ad Species. Be advised, the Division will require 2nd-species testing for your
next renewal. Take four each, tad species samples within the same week as other WET test
sampling, but a minimum of four months apart to provide long-term "seasonal" results. You must
attach these four 2nd-species test results to your next permit -renewal application.
• Permit Part II, Definition of "Daily Maximum" for Total Residual Chlorine (TRC) and pH.
You may collect multiple samples in a given day (24 hours) for TRC or pH, but you may not
composite these samples nor average the analytical results. Moreover, you must report all
individual analyses acquired. To comply with the permit Daily Maximum, compare your permit
limit to your daily, single -sample -event highest concentration.
• Copper and Zinc Monitoring. The Division evaluated your effluent data using Reasonable
Potential Analyses (RPA), as required. This model evaluates, not only reported values, but also
dataset variability. Based on RRSD's copper and zinc data, both metals show reasonable potential
to exceed their respective acute (%2 Fav) standards (see attached Fact Sheet and RPA results).
Therefore, based on state requirements for action level parameters, continued monthly monitoring
for copper and zinc is required. Should toxicity failures become an issue in the future, these
parameters may require permit limits.
If any parts, monitoring 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. You must submit this request in the form of a written petition, conforming to Chapter
150B of the North Carolina General Statutes, and file it with the office of Administrative Hearings, 6714
Mail Service Center, Raleigh, North Carolina 27699-6714. Unless such a demand is made, this permit shall
be final and binding.
N. C. Division of Water Quality / NPDES Unit
1617 Mail Service Center, Raleigh, NC 27699-1617
Internet: h2o.enr.state.nc.us
Phone: [phone]
fax: [phone]
DENR Customer Service Center..1800 623-7748

Issuance of NPDES Permit NC0024201
Roanoke Rapids Sanitary District (RRSD)
Page 2
Please notice that this permit is not transferable except after notifying the Division. The Division may modify,
or revoke and reissue this permit. This permit does not affect your legal requirements to obtain other permits
required by the Division of Water Quality, the Division of Land Resources, the Division of Coastal
Management, or by federal or other local governments.
If you have questions, or if we may be of further service, please call Joe Corporon at [phone], extension
597 or email joe.corporon@a,ncmail.net.
Sincerely,
V\
Coleen H. Sullins
Enclosure: NPDES Permit NC0024201; Fact Sheet with RPA data and analysis.
cc: Raleigh Regional Office/Surface Water Protection Section
NPDES Program, East
Pretreatment Unit
Aquatic Toxicology Unit
Central Files
EPA Region 4

Permit NC0024201
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
(NPDES)
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
Roanoke Rapids Sanitary District
is hereby authorized to discharge wastewater from a facility located at the
Roanoke Rapids Sanitary District WWTP
135 Aqueduct Road, Weldon
Halifax County
to receiving waters designated as the Roanoke River within the Roanoke River Basin in accordance with
effluent limitations, monitoring requirements, and other conditions set forth in Parts I, II, and III hereof.
The permit shall become effective July 1, 2007.
This permit and the authorization to discharge shall expire at midnight on March 31, 2012.
Signed this day June 12, 2007.
/4.71'A'1"4
4t- ; Coleen H. Sullins, Director
Division of Water Quality
By Authority of the Environmental Management Commission

Permit NC0024201
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby
revoked, and as of this 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.
Roanoke Rapids Sanitary District
is hereby authorized to:
1. continue to operate an existing 8.34 MGD wastewater treatment facility comprised of the following
treatment components:
• bar screen and grit chamber
• dual primary clarifiers
• dual trickling filters
• three Aeration basins
• dual final clarifiers
■ chlorination
■ dechlorination
• dual Secondary sludge thickener
• three anaerobic digesters
• lime stabilization
• sludge storage
• sludge drying beds
located at 135 Aqueduct Road near Weldon in Halifax County, and
2. discharge from said treatment works at the location specified on the attached map through Outfall
001 into the Roanoke River, a Class C waterbody within the Roanoke River Basin.

Roanoke Rapids Sanitary District WWTP
Receiving Stream: Roanoke River Drainage Basin: Roanoke
Latitude: 36° 26' 13" N Longitude: 77° 36' 36" W
Stream Class: C Sub -Basin: 03-02-08
State Grid/Quad: B 28 NE / Weldon, NC
North
Facility
Location
not to scale
NPDES Permit NC0024201
Halifax County

Permit NC0024201
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
Beginning with the effective date and lasting until 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
CHARACTERISTICS
EFFLUENT LLMITATIONS
MONITORING REQUIREMENTS
Monthly
Average
Weekly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample 1
Location
Flow
8.34 MGD
Continuous
Recording
Influent or
Effluent
CBOD, 5-day, 20°C 2
25.0 mg/L
37.5 mg/L
Daily
Composite
Influent &
Effluent
Total Suspended Solids 2
30.0 mg/L
45.0 mg/L
Daily
Composite
Influent &
Effluent
NH3 as N
Daily
Composite
Effluent
Total Residual Chlorine
28 µg/L
Daily
Grab
Effluent
Fecal Coliform
(geometric mean)
200/100 ml
400/100 ml
Daily
Grab
Effluent
pH
Between 6.0 and 9.0 Standard Units
Daily
Grab
Daily
Dissolved Oxygen
Daily
Grab
Effluent
Temperature
Daily
Grab
Effluent
Total Nitrogen
(NO2 + NO3 + TKN)
1/Month
Composite
Effluent
Total Phosphorus
1/Month
Composite
Effluent
Total Copper
1/Month
Composite
Effluent
Total Zinc
1/Month
Composite
Effluent
Chronic Toxicity 3
1/Quarter
Composite
Effluent
Dissolved Oxygen
Variable 4
Grab
U, D
Temperature
Variable
Grab
U, D
Footnotes:
1. U: Upstream, at 308 Rollingwood Road. D: Downstream, where U.S. 158 crosses at the Roanoke River. The Permittee
may discontinue influent, effluent and/or stream sampling at such times when adverse stream flows or extreme weather
conditions pose a substantial risk of injury or death to persons collecting samples. On such days, written justification for
sample discontinuance shall be specified in that month's Discharge Monitoring Report (DMR). Sampling and monitoring
shall resume at the first safe opportunity.
2. Monthly Average effluent CBOD5 and TSS concentrations shall not exceed 15% of respective influent value (i.e., 85%
removal is required).
3. Chronic Toxicity (Ceriodaphnia) at 1.1 %; January, April, July and October [see Special Condition A. (2.)].
4. Variable Sampling - Upstream/Downstream samples shall be collected 3/Week during June, July, August, September,
and 1/Week during the remaining months of the year.
The Permittee shall discharge no floating solids or foam visible in other than trace amounts.

Permit NC0024201
EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS — SPECIAL CONDITIONS
A. (2.) CHRONIC TOXICITY PERMIT LIMIT (Quarterly)
The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality to Ceriodaphnia
dubia at an effluent concentration of 1.1 %.
The permit holder shall perform at a minimum, quarterly monitoring using test procedures outlined in the "North Carolina
Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised February 1998, or subsequent versions or `North Carolina
Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised -February 1998) or subsequent versions. The tests will be
performed during the months of January, April, July and October. Effluent sampling for this testing shall be
performed at the NPDES permitted final effluent discharge below all treatment processes.
If the test procedure performed as the first test of any single quarter results in a failure or ChV below the permit limit, then
multiple -concentration testing shall be performed at a minimum, in each of the two following months as described in `North
Carolina Phase ll Chronic Whole Effluent Toxicity Test Procedure" (Revised -February 1998) or subsequent versions.
The chronic value for multiple concentration tests will be determined using the geometric mean of the highest concentration
having no detectable impairment of reproduction or survival and the lowest concentration that does have a detectable
impairment of reproduction or survival. The definition of "detectable impairment," collection methods, exposure regimes, and
further statistical methods are specified in the `North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure"
(Revised -February 1998) or subsequent versions.
All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge Monitoring Form
(MR-1) for the months in which tests were performed, using the parameter code TGP3B for the pass/fail results and THP3B
for the Chronic Value. Additionally, DWQ Form AT-3 (original) is to be sent to the following address:
Attention: 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, accurate, include all supporting chemical/physical measurements and all concentration/response
data, and be certified by laboratory supervisor and ORC or approved designate signature. Total residual chlorine of the
effluent toxicity sample must be measured and reported if chlorine is employed for disinfection of the waste stream.
Should there be no discharge of flow from the facility during a month in which toxicity monitoring is required, the Permittee
will complete the information located at the top of the aquatic toxicity (AT) test form indicating the facility name, permit
number, pipe number, county, and the month/year of the report with the notation of "No Flow" in the comment area of the
form. The report shall be submitted to the Environmental Sciences Branch at the address cited above.
Should the Permittee fail to monitor during a month in which toxicity monitoring is required, monitoring will be required
during the following month.
Should any test data from this monitoring requirement or tests performed by the North Carolina Division of Water Quality
indicate potential impacts to the receiving stream, this permit may be re -opened and modified to include alternate monitoring
requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control
organism survival, minimum control organism reproduction, and appropriate environmental controls,
shall constitute an invalid test and will require immediate follow-up testing to be completed no later than
the last day of the month following the month of the initial monitoring.

Permit NC0024201
EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS — SPECIAL CONDITIONS
A. (3.) Effluent Pollutant Scan
The Permittee shall perform an Effluent Pollutant Scan, approximately annually, for all parameters listed in the
attached table (in accordance with 40 CFR Part 136). Samples shall represent seasonal variations. Unless
otherwise indicated, metals shall be analyzed as "total recoverable."
Ammonia (as N)
Chlorine (total residual, TRC)
Dissolved oxygen
Nitrate/Nitrite
Kjeldahl nitrogen
Oil and grease
Phosphorus
Total dissolved solids
Hardness
Antimony
Arsenic
Beryllium
Cadmium
Chromium
Copper
Lead
Mercury
Nickel
Selenium
Silver
Thallium
Zinc
Cyanide
Total phenolic compounds
Volatile organic compounds:
Acrolein
Acrylonitrile
Benzene
Bromofomi
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:
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)anthracene
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
Indeno(1,2,3-cd)pyrene
Isophorone
Naphthalene
Nitrobenzene
N-nitrosodi-n-propylamine
N-nitrosodimethylamine
N-nitrosodiphenylamine
Phenanthrene
Pyrene
1,2,4-trichlorobenzene
The Permittee shall report test results to the Division within 90 days of sampling using DWQ Form- A MR
PPA1, or other form approved by the Director. Two copies of the report shall be submitted along with the DMR
to the following address: Division of Water Quality, Water Quality Section, Central Files, 1617 Mail Service
Center, Raleigh, North Carolina 27699-1617.

NCDENR / DWQ / NPDES Unit
FACT SHEET
FOR NPDES PERMIT DEVELOPMENT
Permit NC0024201
INTRODUCTION
Roanoke Rapids Sanitary District Wastewater Treatment Plant (WWTP), herein called RRSD or the
Permittee, requires a National Pollutant Discharge Elimination System (NPDES) permit to dispose
treated wastewater to the surface waters of the state. The permittee's 5-year NPDES permit expired
March 31, 2007 and they have requested renewal from the Division of Water Quality (the Division).
This Fact Sheet summarizes background information and rationale used by the Division's NPDES
Unit to determine permit limits and monitoring conditions.
FACILITY RECORDS REVIEW
Facility Description. RRSD WWTP (Table 1) is an 8.3 MGD, Grade IV publicly owned treatment
works (POTW) with a Pretreatment Program. The treatment system consists of a bar screen, grit
chamber, dual primary clarifiers, dual trickling filters, aeration basins, dual final clarifiers,
chlorination, dechlorination, dual secondary sludge thickeners, anaerobic digesters, lime stabilization
facility, sludge storage, and sludge drying beds. The Permittee relocated Outfall 001 to the Roanoke
River mainstem in April 2005 (DWQ received Engineer's Certification by Shannon D. Dorsey, Reg #
29454 on April 27, 2005). This relocation date limits the renewal parameter database.
Table 1.
Facility Information
Applicant/Facility Name
Roanoke Rapids Sanitary District
Applicant Address
P.O. Box 308, Roanoke Rapids, NC 27870
Facility Address
135 Aqueduct Road, Weldon, NC 27870
Permitted Flow (MGD)
8.34
Type of Waste
Domestic (85%) Industrial (15%)
Related Permit
Facility Grade / Permit Status
Grade IV / Renewal
Drainage Basin / County
Cape Fear River Basin / Halifax County
Miscellaneous
Receiving Stream
Roanoke River
Regional Office
Raleigh
Stream Classification
C
State Grid /
USGS Topo Quad
B 28 NE /
Weldon, NC
303(d) Listed?
Yes (TMDL for dioxin)
Permit Writer
Joe R. Corporon
Subbasin
03-02-08
Date:
28Mar07
Drainage Area (sq. nu.)
Lat. 36° 26' 13" N Long. 77° 36' 36" W
Summer 7Q10 (cfs)
1,172
Winter 7Q10 (cfs)
30Q2 (cfs)
Average Flow (cfs)
IWC (%)
1.1
Fact Sheet
Renewal -- NPDES Permit NC0024201
Page 1

CORRESPONDENCE
Staff Report. Raleigh Regional Office (RRO) conducted its annual facility inspection and Myrl
Nisely prepared a Staff Report dated November 30, 2006. The RRO staff found the facility in good
condition and in compliance with the permit; they recommended that the NPDES Program renew the
permit in accordance with the Basin Plan.
Division Records and Permittee's Renewal Application. The current permit expired on March 31,
2007, and the Division received the Permittee's prompt request to renew (Standard Form C) on
October 4, 2006. The application included a request to remove effluent and upstream monitoring
requirements for mercury, based on data indicating "not detected" (Because of high dilution by the
receiving stream, RRSD is not required to use EPA test method 1631E for mercury). This request
will be granted (see RPA). The Permittee also requested to reduce monthly instream sampling
frequencies. Based on WWTP Grade IV requirements, this request will be denied.
COMPLIANCE REVIEW
Waste Load Allocation (WLA). As of April 2005, this facility discharges to the mainstem of the
Roanoke River [Stream Index No. 23-(26)], a Class C waterbody within the Roanoke River Basin.
The Division prepared a WLA for the receiving stream in December 1996 (eventual dilution by the
Roanoke River) and developed effluent limits and monitoring requirements considering an in -stream
waste concentration (IWC) of 1.1 % at 8.4 MGD. The Division views these limits and monitoring
requirements appropriate for renewal except as outlined below (see Renewal Summary).
Verifying Existing Stream Conditions. This segment of the Roanoke River is not impaired, but
the down -river segment [Stream Index No. 23-(53)] is identified as impaired for dioxin [DWQ 303(d)
list, February 2003].
DMR Instream Data and Effluent Flow Review. The Division reviewed 48 months of monthly
Discharge Monitoring Reports (DMRs) for January 2003 through December 2006. The Permittee's
DMRs for these years appear regular, thorough, and complete. The Division compared daily flows for
years 2004, 2005, and 2006. These data yield a 3-year average flow of 4.37 MGD, or discharge about
52 % of permitted capacity.
Reasonable Potential Analyses (RPA) — Pollutants of Concern (POCs). The Division restricted the
RPA database timeframe to April 2005 through December 2006 because the Permittee relocated Outfall
001 from Chockoyotte Creek to the mainstem of the Roanoke River (IWC = 1.1 %), as provided in the
previous permit. To establish POCs, the Division reviewed the permit application, discharge monitoring
reports (2003 through 2006), pretreatment data, and the Basin Plan. The Division applied the standard
Reasonable Potential Analysis (RPA) to calculate a maximum predicted concentration for each POC.
Each maximum was then compared to the POC's freshwater Chronic Standard (Table 2) and also to its
Final Acute Value (Y2 FAV) for freshwater (Table 3).
If by the above method, a POC showed reasonable potential to exceed its %2 FAV, the Division
included a permit limit as a Daily Maximum to protect the receiving stream against acute toxic
affects. Similarly, if the maximum exceeded the chronic standard, a Weekly Average limit was added
Fact Sheet
Renewal -- NPDES NC0024201
Page 2

to the permit. Findings are summarized below (see Renewal Summary, Table 4). These comments
and renewal actions reference the previous permit, effective June 1, 2005, as modified (see previous
permit Section A. (3.):
Table 2.
RRSD WWTP -- Chronic RPA Findings and Renewal Action
x
Parameter i
1 `Samplest:
-
C
F its; '
%) i
Maximum
Predicted
• .
,osnicentratio�a °
F
yln
'C om ents� /F .: Y,
;:. .. _...
Ren_e'wa 1 , aon
� i
Arsenic
9
0
Not detected
—
—
No changes to the permit.
Cadmium
9
2
3 µg/L
183 µg/L
No
No changes to the permit.
Chromium
10
4
88 µg/L
4,583 µg/L
No
No changes to the permit.
Copper
21
21
560 µg/L
642 µg/L
No
See Table 3 = continue
monitoring 1/Month. Action
Level Standard — no toxicity
problem, therefore no limit;
Fluoride
21
21
2,054 µg/L
164,993 µg/L
No
Delete permit monitoring
(relegate to pretreatment
program)
Mercury
58
0
Not detected
—
—
Delete monitoring and permit
limit (relegate to pretreatment
program)
Lead
8
0
Not detected
—
—
No changes to the permit.
Nickel
8
0
Not detected
—
—
No changes to the permit.
Selenium -
21
0
Not detected
—
—
Delete permit monitoring
(relegate to pretreatment
program)
Zinc
21
21
1,119 µg/L
4,583 µg/L
No
See Table 3 - continue
monitoring 1/Month.
*RP = data indicate "Reasonable Potential" to exceed instream Water Quality Standard.
Table 3.
RRSD WWTP — Acute RPA Findings and Renewal Action
, Parameter
Samples‘
tit
Hits '
, aximum
Predicted
/ FA'V /r r
CMC; ;
t W.
' : y/ur
,Coiiiments 1l
A TO :
...OweNV- ctaiM
Arsenic
9
0
Not detected
—
—
No acute standard
Cadmium
9
2
3 µg/L
15.0 µg/L
No
No changes to permit
Chromium
10
4
88 µg/L
1022 µg/L
No
No changes to permit
Copper .
21
21
560 µg/L
7.3 µg/L
Yes
No changes to permit. Action
Level Standard — no toxicity
problem, therefore no limit
Fluoride_
21
21
2,054 µg/L
—
—
No acute standard (see Table 2)
Mercury
58
0
Not detected
—
—
No acute criteria - standard
based on bio-accumulation
(see Table 2)
Lead
8
0
Not detected
1.4 µg/L
—
No changes to permit
Nickel
8
0
Not detected
33.8 µg/L
—
No changes to permit
Selenium
21
0
Not detected
261 µg/L
—
Delete permit monitoring
(see Table 2)
Zinc
21
21
1,119 µg/L
67 µg/L
Yes
No changes to permit. Action
Level Standard — no toxicity
problem, therefore no limit
*RP = data indicate "Reasonable Potential" to exceed instream Water Quality Standard.
Fact Sheet
Renewal -- NPDES NC0024201
Page 3

CORRESPONDENCE
Staff Report. Raleigh Regional Office (RRO) conducted its annual facility inspection and Myrl
Nisely prepared a Staff Report dated November 30, 2006. The RRO staff found the facility in good
condition and in compliance with the permit; they recommended that the NPDES Program renew the
permit in accordance with the Basin Plan.
Division Records and Permittee's Renewal Application. The current permit expired on March 31,
2007, and the Division received the Permittee's prompt request to renew (Standard Form C) on
October 4, 2006. The application included a request to remove effluent and upstream monitoring
requirements for mercury, based on data indicating "not detected" (Because of high dilution by the
receiving stream, RRSD is not required to use EPA test method 1631E for mercury). This request
will be granted (see RPA). The Permittee also requested to reduce monthly instream sampling
frequencies. Based on WWTP Grade IV requirements, this request will be denied.
COMPLIANCE REVIEW
Waste Load Allocation (WLA). As of April 2005, this facility discharges to the mainstem of the
Roanoke River [Stream Index No. 23-(26)], a Class C waterbody within the Roanoke River Basin.
The Division prepared a WLA for the receiving stream in December 1996 (eventual dilution by the
Roanoke River) and developed effluent limits and monitoring requirements considering an in -stream
waste concentration (IWC) of 1.1 % at 8.4 MGD. The Division views these limits and monitoring
requirements appropriate for renewal except as outlined below (see Renewal Summary).
Verifying Existing Stream Conditions. This segment of the Roanoke River is not impaired, but
the down -river segment [Stream Index No. 23-(53)] is identified as impaired for dioxin [DWQ 303(d)
list, February 2003].
DMR Instream Data and Effluent Flow Review. The Division reviewed 48 months of monthly
Discharge Monitoring Reports (DMRs) for January 2003 through December 2006. The Permittee's
DMRs for these years appear regular, thorough, and complete. The Division compared daily flows for
years 2004, 2005, and 2006. These data yield a 3-year average flow of 4.37 MGD, or discharge about
52 % of permitted capacity.
Reasonable Potential Analyses (RPA) — Pollutants of Concern (POCs). The Division restricted the
RPA database timeframe to April 2005 through December 2006 because the Permittee relocated Outfall
001 from Chockoyotte Creek to the mainstem of the Roanoke River (IWC =1.1 %), as provided in the
previous permit. To establish POCs, the Division reviewed the permit application, discharge monitoring
reports (2003 through 2006), pretreatment data, and the Basin Plan. The Division applied the standard
Reasonable Potential Analysis (RPA) to calculate a maximum predicted concentration for each POC.
Each maximum was then compared to the POC's freshwater Chronic Standard (Table 2) and also to its
Final Acute Value (Y2 FAV) for freshwater (Table 3).
If by the above method, a POC showed reasonable potential to exceed its '/2 FAV, the Division
included a permit limit as a Daily Maximum to protect the receiving stream against acute toxic
affects. Similarly, if the maximum exceeded the chronic standard, a Weekly Average limit was added
Fact Sheet
Renewal -- NPDES NC0024201
Page 2

PROPOSED SCHEDULE OF ISSUANCE
Draft Permit to Public Notice:
Permit Scheduled to Issue:
April 11, 2007
June 4, 2007
NPDES UNIT CONTACT
If you have questions regarding any • he above information or on the attached permit, please
contact Joe Co • ► • 919) 733- ext. 597.
1:
NAME: //' ` 0
/rEGIONAL OF ' CE COMMENTS
NAME:
DATE: ic607A49R0�
DATE:
REGIONAL SUPERVISOR: DATE:
NPDES SUPERVISOR: DATE:
Fact Sheet
Renewal -- NPDES NC002420 I
Page 5

Table 1. Project Information
Facility Name
WWTP Grade
NPDES Permit
Outfall
Flow, Qw (MGD)
Receiving Stream
Stream Class
7Q10s (cfs)
7Q10w (cfs)
30Q2 (cfs)
QA (cfs)
Time Period
Data Source(s)
Roanoke Rapids Sanitary District WWTP
IV
NC0024201
001
8.3
Roanoke River
C
1172.0
Jan2004-Dec2006
DMRs
Table 2. Parameters of Concern
Par01
Par02
Par03
Par04
Par05
Par06
Par07
Par08
Par09
Par10
Par11
Par12
Par13
Par14
Par15
Name
Type Chronic Modifier Acute PQL Units
Arsenic
C
50
ug/L
ug/L
Cadmium
NC
2
15
ug/L
Chromium
NC
50
1022
ug/L
Copper
NC
7
AL
7.3
ug/L
ug/L
Fluoride
NC
1800
ug/L
Lead
NC
25
N
33.8
ug/L
Mercury
NC
12
2.0
ng/L
ug/L
Nickel
NC
88
261
ug/L
ug/L
Selenium
NC
5
56
ug/L
ug/L
Zinc
NC
50
AL
67
ug/L
24201 RRsd - RPA, input
3/22/2007

REASONABLE POTENTIAL ANALYSIS
Roanoke Rapids Sanitary District WWTP
NC0024201
Time Period Jan2004-Dec2006
Qw (MGD) 8.34
7Q10S (cfs) 1172
7Q10W (cfs) 0
30Q2 (cfs) 0
Avg. Stream Flow, QA (cfs) 0
Rec'ving Stream Roanoke River
WWTP Class IV
/WC (%) 7Q 10S 1.091
@ 7Q10W N/A
( 30Q2 N/A
C? QA N/A
Stream Class C
Outfall 001
Qw=8.34MGD
PARAMETER
TYPE
(1)
STANDARDS &
CRITERIA (2)
POL
Units
REASONABLE POTENTIAL RESULTS
RECOMMENDED ACTION
NCWQS/ li FAV/
Chronic Acute
n # net. Max Pred Cw Allowable Cw
Arsenic
C
50
ug/L
Acute: N/A
9 0 1.5 __ _ ___ _
Note: n<12 Chronic #VALUE!
Limited data set
__ _ _ __ ______________________ ^
not detected
Cadmium
NC
2 15
ug/L
9 2
Note: n<12
Limited data
Acute: 15
3 __ _ ___ ___
Chronic: 183
set
RP = No
_ _ ___________________________
RP = No
Chromium
NC
50 1,022
ug/L
10 4
Note: n<12
Limited data
88
set
Acute: 1,022
_ _ __ _ _
Chronic:4,583
RP = No
_ _ __ _________________________
RP = No
Copper
NC
7 AL 7.3
ug/L
21 21
506
Acute: 7
_ _ _
RP = YES
_
Fluoride
NC
1,800
ug/L
21 21
Acute: N/A
2,054
Chronic:164,993
_ _ _ -_---_-_-------_- --_ — — —
RP = No
Lead
NC
25 N 33.8
ug/L
8 0
Note: n<12
Limited data
1.5
set
Acute: 34
__ _ ___ _ _
Chronic 2,292
not detected
_ _ _ _________________________
not detected
Mercury
NC
12
2.0000
ng/L
58 0
100
Acute: N/A
__ _ ___ _ _
Chronic: 1,100
_ _ _ _________________________
not detected
Nickel
NC
88 261
ug/L
8 0
Note: n<12
Limited data
3
set
Acute: 261
__ _ ___ _
Chronic: 8,066
not detected
__ _ _ _________________________
not detected
Selenium
NC
5.0 56
ug/L
21 0
2
Acute: 56
__ _ _ ___ _
Chronic: 458
not detected
_ _ ________________________
not detected
Zinc
NC
50 AL. 67
ug/L
21 21
1,119
Acute: 67
__ _ ___ _ _
Chronic 4,583
RP = YES
_ _ ___________________________
RP = No
Legend:
C = Carcinogenic
NC = Non -carcinogenic
A = Aesthetic
" Freshwater Discharge
24201 RRsd - RPA, rpa
3/22/2007

REASONABLE POTENTIAL ANALYSIS
Arsenic
Cadmium
Date Data BDL=1/2DL Results
1.5 Std Dev.
Mean
1.5 C.V.
1.5 n
May-2005
Jun-2005
Jul-2005
Aug-2005
Sep-2005
Oct-2005
Nov-2005
Dec-2005
Jan-2006
Feb-2006
Mar-2006
Apr-2006
May-2006
Jun-2006
Jul-2006
Aug-2006
Sep-2006
Oct-2006
Nov-2006
Dec-2006
Jan-2007
3
3
3
3
3
3
3
3
3
1.5
1.5
1.5
1.5
1.5
1.5
Mut Factor =
Max. Value
Max. Pred Cw
0.0000
1.5000
0.0000
9
1.0000
1.5 ug/L
1.5 ug/L
Date
Data
May-2005
Jun-2005
Jul-2005
Aug-2005
Sep-2005
Oct-2005
Nov-2005
Dec-2005
Jan-2006
Feb-2006
Mar-2006
Apr-2006
May-2006
Jun-2006
Jul-2006
Aug-2006
Sep-2006
Oct-2006
Nov-2006
Dec-2006
Jan-2007
0.1
2
2
0.1
0.1
2
2
2
2
BDL=1/2DL Results
0.1 Std Dev. 0.4586
Mean 0.6944
1.0 C.V. 0.6603
1.0 n 9
0.1 Mult Factor = 3.4900
Max. Value 1.0 ug/L
Max. Pred Cw 3.5 ug/L
0.05
1.0
1.0
1.0
1.0
24201 RRsd - RPA, data
- 1 - 3/22/2007

REASONABLE POTENTIAL ANALYSIS
Chromium
Copper
Date Data BDL=1/2DL Results
1.0 Std Dev.
Mean
1.0 C.V.
1.0 n
May-2005
Jun-2005
Jul-2005
Aug-2005
Sep-2005
Oct-2005
Nov-2005
Dec-2005
Jan-2006
Feb-2006
Mar-2006
Apr-2006
May-2006
Jun-2006
Jul-2006
Aug-2006
Sep-2006
Oct-2006
Nov-2006
Dec-2006
Jan-2007
2
2
2
2
2
2
3
3
2
12
2.0 Mult Factor =
Max. Value
1.0 Max. Pred Cw
1.0
3.0
3.0
1.0
12.0
3.4059
2.6000
1.3100
10
7.3200
12.0 ug/L
87.8 ug/L
Date Data
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
May-2005
Jun-2005
Jul-2005
Aug-2005
Sep-2005
Oct-2005
Nov-2005
Dec-2005
Jan-2006
Feb-2006
Mar-2006
Apr-2006
May-2006
Jun-2006
Jul-2006
Aug-2006
Sep-2006
Oct-2006
Nov-2006
Dec-2006
Jan-2007
10
16
6.6
14
11
8
8
6
5
5
7
7
9
20
10
17
6
11
12
11
105
BDL=1/2DL Results
10.0 Std Dev. 21.1275
16.0 Mean 14.5048
6.6 C.V. 1.4566
14.0 n 21
11.0
8.0 Mult Factor = 4.8200
8.0 Max. Value 105.0 ug/L
6.0 Max. Pred Cw 506.1 ug/L
5.0
5.0
7.0
7.0
9.0
20.0
10.0
17.0
6.0
11.0
12.0
11.0
105.0
24201 RRsd - RPA, data
- 4 - 3/22/2007

REASONABLE POTENTIAL ANALYSIS
Fluoride
Lead
Date Data BDL=1/2DL Results
1 May-2005 1140 1140 Std Dev. 248.0730
2 Jun-2005 1260 1260 Mean 730.0952
3 Jul-2005 780 780 C.V. 0.3398
4 Aug-2005 782 782 n 21
5 Sep-2005 890 890
6 Oct-2005 979 979 Mult Factor = 1.6300
7 Nov-2005 759 759 Max. Value 1260.0 ug/L
8 Dec-2005 459 459 Max. Pred Cw 2053.8 ug/L
9 Jan-2006 482 482
10 Feb-2006 513 513
11 Mar-2006 477 477
12 Apr-2006 722 722
13 May-2006 648 648
14 Jun-2006 906 906
15 Jul-2006 542 542
16 Aug-2006 1,120 1120
17 Sep-2006 703 703
18 Oct-2006 737 737
19 Nov-2006 600 600
20 Dec-2006 453 453
21 Jan-2007 380 380
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
Date
1 May-2005
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
Jun-2005
Jul-2005
Aug-2005
Sep-2005
Oct-2005
Nov-2005
Dec-2005
Jan-2006
Feb-2006
Mar-2006
Apr-2006
May-2006
Jun-2006
Jul-2006
Aug-2006
Sep-2006
Oct-2006
Nov-2006
Dec-2006
Jan-2007
Data
3
3
3
3
3
3
3
BDL=1/2DL Results
1.5 Std Dev.
Mean
1.5 C.V.
n
1.5 Mult Factor =
Max. Value
Max. Pred Cw
1.5
1.5
1.5
1.5
1.5
0.0000
1.5000
0.0000
8
1.0000
1.5 ug/L
1.5 ug/L
24201 RRsd - RPA, data
- 7 - 3/22/2007

REASONABLE POTENTIAL ANALYSIS
Mercury
Nickel
Date Data BDL=1/2DL Results
1 May-2005 Std Dev. 0.0000
2 Jun-2005 Mean 100.0000
3 Jul-2005 200 100 C.V. 0.0000
4 Aug-2005 200 100 n 58
5 Aug-2005 200 100
6 Aug-2005 200 100 Mult Factor = 1.00
7 Aug-2005 200 100 Max. Value 100.0 ng/L
8 Sep-2005 200 100 Max. Pred Cw 100.0 ng/L
9 Sep-2005 200 100
10 Sep-2005 200 100
11 Sep-2005 200 100
12 Oct-2005 200 100
13 Oct-2005 200 100
14 Oct-2005 200 100
15 Oct-2005 200 100
16 Nov-2005 200 100
17 Nov-2005 200 100
18 Nov-2005 200 100
19 Nov-2005 200 100
20 Dec-2005 200 100
21 Dec-2005 200 100
22 Dec-2005 200 100
23 Dec-2005 200 100
24 Jan-2006 200 100
25 Jan-2006 200 100
26 Jan-2006 200 100
27 Jan-2006 200 100
28 Feb-2006 200 100
29 Feb-2006 200 100
30 Feb-2006 200 100
31 Feb-2006 200 100
32 Mar-2006 200 100
33 Mar-2006 200 100
34 Mar-2006 200 100
35 Mar-2006 200 100
36 Apr-2006 200 100
37 Apr-2006 200 100
38 Apr-2006 200 100
39 Apr-2006 200 100
40 May-2006 200 100
41 May-2006 200 100
42 May-2006 200 100
43 May-2006 200 100
44 Jun-2006 200 100
45 Jun-2006 200 100
46 Jun-2006 200 100
47 Jun-2006 200 100
48 Jun-2006 200 100
49 Mar-2006 200 100
50 Jul-2006 200 100
51 Jul-2006 200 100
52 Aug-2006 200 100
53 Aug-2006 200 100
54 Aug-2006 200 100
55 Aug-2006 200 100
56 Sep-2006 200 100
57
58
59
60 Oct-2006 200 100
61
62
63
64 Nov-2006 200 100
65
66
67
68 Dec-2006 200 100
69
70
Date Data
1 May-2005
2 Jun-2005
3 Jul-2005
4 Aug-2005
5 Sep-2005
6 Oct-2005
7 Nov-2005
8 Dec-2005
9 Jan-2006
10 Feb-2006
11 Mar-2006
12 Apr-2006
13 May-2006
14 Jun-2006
15 Jul-2006
16 Aug-2006
17 Sep-2006
18 Oct-2006
19 Nov-2006
20 Dec-2006
21 Jan-2007
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
5
5
5
5
5
5
5
5
BDL=1/2DL Results
2.5 Std Dev.
Mean
2.5 C.V.
n
2.5 Mult Factor =
Max. Value
Max. Pred Cw
2.5
2.5
2.5
2.5
2.5
0.0000
2.5000
0.0000
8
1.0000
2.5 ug/L
2.5 ug/L
24201 RRsd - RPA, data
- 10 - 3/22/2007

REASONABLE POTENTIAL ANALYSIS
Selenium
Zinc
Date Data
May-2005
Jun-2005
Jul-2005
Aug-2005
Sep-2005
Oct-2005
Nov-2005
Dec-2005
Jan-2006
Feb-2006
Mar-2006
Apr-2006
May-2006
Jun-2006
Jul-2006
Aug-2006
Sep-2006
Oct-2006
Nov-2006
Dec-2006
Jan-2007
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
BDL=1/2DL Results
1.5 Std Dev. 0.0000
1.5 Mean 1.5000
1.5 C.V. 0.0000
1.5 n 21
1.5
1.5 Mutt Factor = 1.0000
1.5 Max. Value 1.5 ug/L
1.5 Max. Pred Cw 1.5 ug/L
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
May-2005
Jun-2005
Jul-2005
Aug-2005
Sep-2005
Oct-2005
Nov-2005
Dec-2005
Jan-2006
Feb-2006
Mar-2006
Apr-2006
May-2006
Jun-2006
Jul-2006
Aug-2006
Sep-2006
Oct-2006
Nov-2006
Dec-2006
Jan-2007
Date Data BDL=1/2DL Results
46.0 Std Dev. 67.8819
76.0 Mean 74.0476
66.0 C.V. 0.9167
86.0 n 21
111.0
52.0 MuIt Factor = 3.1600
34.0 Max. Value 354.0 ug/L
34.0 Max. Pred Cw 1118.6 ug/L
66.0
46
76
66
86
111
52
34
34
66
58
83
76
53
74
47
94
36
41
33
35
354
58.0
83.0
76.0
53.0
74.0
47.0
94.0
36.0
41.0
33.0
35.0
354.0
24201 RRsd - RPA, data
- 13 - 3/22/2007

REASONABLE POTENTIAL ANALYSIS
24201 RRsd - RPA, data
- 14 - 3/22/2007

FILE CONTENTS:
Left ide:
I BIMS Tracking Slip
Right side:
❑/ Streamline Package Sheet
L f/ Draft Permit Cover Letter.
C7/ Draft Permit
ILFacility Map
C" Fact Sheet.
Permit Writer's Notes
Cl' Staff Report from Region
Er; Old Permit
LK Permit Application.
l� Acknowledgement Letter
❑ /Permittee Responses
Q' Waste Load Allocation
NPDES PERMIT
DRAFT & FINAL
CHECK LIST
Facility
h--,;(1_015)
Pemtit No4t
(to re •n, onl streamlined)
(add n . • icy text; summarize or changes to p mit)
(order: cover, supplement, map -ffluent sheets, special conditions)
(E-Map: include facility Ou i .1 is; U and D sample locations)
(documents permit write ' issues and re -issue logic)
(if not in Facts Sheet - chronology, strategy, DMR Review, RPA, etc.)
(as appropriate -- . needed if streamlined)
(Text, Effluent Sheets and Special Conditions)
(New Permit or Renewal; any additional permittee correspondence)
(NPDES Unit written response to Renewal Application)
(to acknowledgement letter, if any)
(reference date; notes if recalculated for current action)
N te: Italics indicate special conditions not always required or applicable.
zSu mitted to 1 • for Peer Review: Date 3
itrzib
1)./� i �.�_ 7
P r Review completed by [ 0``'�--1� �e
vb U ated Public Notice System [date] 0%
P Y
S bmitted for Public Notice on �"/ HT x� l-Newspaper Notice Received . Actual Notice date(s)
�tU
Draft Permit [Mailed / -Mailed to (Regional Staff)ltal.-0 ci...-- l'r by Z' Date
❑ Regional Office Review /Approval completed
1byy+ , 1 ..Received on [Date]
C9�Additional Review by ['DEH] t %*- vlP0 l'� 0 initiated by \1F/�'— Date
❑ Additional Review/Approval completed by Date
er-EPA Review Draft "4O564Jt 14711.7` initiated y l S=---- Date b
O EPA Review /Approval
Admin cutoff date J444;
Updated BIMS Events: [date] 4_q_Afgb
/ E-mail] completed by ivit['f}-U�
V FINAL to Mike / Susan / Tom
❑ Additional Review [other]
r signature on 1()V �(�irfi Letter Dated
r1
Date Received o--49I'IP
fL,31) )5)
O Final Files transferred to Server (Permits Folder) v J" 44/ l Final Updates: Events
Version 060ct05
FfF PA6-5
FrT)t

Roanoke Rapids Sanitary District
P.O. Box 308
1000 Jackson Street
Roanoke Rapids, NC 27870
[phone]
Fax: [phone]
www.rrsd.org
May 14, 2007 CERTIFIED MAIL
RETURN RECEIPT REQUESTED
Mr. Joe R. Corporon, L.G.
NPDES Unit, Division of Water Quality
1617 Mail Service Center
Raleigh, North Carolina, 27699-1617
RE: Renewal of NPDES Permit Number NC0024201
Roanoke Rapids Sanitary District Wastewater Treatment Plant
135 Aqueduct Road
Halifax County
Dear Mr. Corporon,
rf:))
it
,1 .!
1
MAY 1 6 2007
L
C.,..LIn I
The Roanoke Rapids Sanitary District (RRSD) received a draft permit for the referenced facility on April
13, 2007. We have reviewed this draft permit and wish to provide the following comments and requests
for clarification:
• On the permit signature page please correct the dates for year 2007.
• On the page entitled "Effluent Limitations and Monitoring Requirements" please insert the word
"until" after the word "lasting" in the first sentence on this page.
• Measurement frequency for CBOD, TSS, NH3, Total Residual Chlorine, Fecal Coliform, DO, and
Temperature has been changed from "Daily" to "1/day." We request the measurement frequency
remain "Daily."
We acknowledge that chronic toxicity testing will be performed for Ceriodaphnia only and that
second species is neither required during the period of the permit nor for permit renewal.
• We acknowledge the removal of sampling for selenium, fluoride, and mercury. We request the
removal of monthly effluent composite sampling for copper and zinc as well. Our Discharge
Monitoring Report (DMR) data shows negligible amounts of these pollutants in our effluent.
• Please correct the sample location for pH to read "effluent" instead of "1/day."
• We acknowledge that p-chloro-m-cresol has been removed from the Effluent Pollutant Scan.
• We acknowledge that the Effluent Pollutant Scan does not require low level testing for Mercury
neither during the period of the permit nor for permit renewal.
• Refer to Part II, Definitions. Please clarify the definition of Daily Maximum as it relates to the
effluent limit for Total Residual Chlorine and pH and how each would be calculated.
c^daamYNs a-d se:a9s1danhN bzwnentercdas pan. efpenitccmmenL07 da:
Page:
1/2

• Refer to Part IV, Section C, item 7. Our understanding is that a priority pollutant scan for SIUs is
only required once per year.
• RRSD believes it is the State of North Carolina's intention that the exclusion from sampling during
extreme weather and hazardous conditions promulgated under 15A NCAC 2B.0505(c)(4) includes
influent and effluent sampling in addition to receiving stream sampling. We request the following
language be included as a Special Condition in the NPDES permit:
"Influent and effluent sampling events may be discontinued at such times as
extreme weather conditions or other hazardous conditions (such as local
flooding, high winds, hurricanes, tornados, electrical storms, etc.) exist resulting
in substantial risk of injury or death to persons collecting samples. In such cases,
on each day that sampling is discontinued, written justification for the
discontinuance shall be specified in the monitoring report for the month in which
the event occurred. Sampling shall be resumed at the first opportunity after the
risk period as ceased."
• We request the following information as part of the draft permit process:
o A copy of the permit Fact Sheet.
o Documentation for any methodology, data, and assumptions used in any permit
modification, including Reasonable Potential Analyses, if applicable.
o A copy of any comments that are received from the public regarding this permit renewal, if
applicable.
We very much appreciate the time and effort of the NPDES Unit to consider our requests for this permit
renewal. Please do not hesitate to call me (252-537-9137) if you have any questions.
Sincerely,
Roanoke Rapids Sanitary District
AO
e::r)-y"------.—____
R. Danieley Brown, PE
Chief Executive Officer
Attachments
Cc: Gregg Camp, ORC RRSD Wastewater Treatment Plant
Dave Goodrich, DWQ, NPDES Unit Supervisor
Mary Sadler, ARCADIS
NPDES Unit File — 2
File

Ss0 s1:47
Ja\
A ;:z UNITED STATES ENVIRONMENTAL PROTECTION AGENCY
z.W REGION 4
i.z. ra o
ATLANTA FEDERAL CENTER
61 FORSYTH STREET
��T'lc PROT.-- ATLANTA, GEORGIA 30303-8960
APR 232007
Mr. Joe Corporon
North Carolina Department of Environment and
Natural Resources
Division of Water Quality
NPDES Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
SUBJ: Draft NPDES Permit
Roanoke Rapids Sanitary District WWTP
Permit No. NC0024201
APR 2 6 2007
DENR -'MAZER DUALITY
POINT SO::aCE
Dear Mr. Corporon:
In accordance with the EPA/NCDENR MOA, we have completed review of the draft
permit referenced above and have no comments. We request that we be afforded an additional
review opportunity only if significant changes are made to the draft permit prior to issuance or if
significant comments objecting to it are received. Otherwise, please send us one copy of the final
permit when issued.
Sincerely,
Marshall Hyatt, Environmental Scientist
Permits, Grants, and Technical Assistance Branch
Water Management Division
Internet Address (URL) • http://www.epa.gov
Recycled/Recyclable • Printed with Vegetable Oil Based Inks on Recycled Paper (Minimum 30% Postconsumer)

PUBLIC NOTICE
STATE OF
NORTH CARru INA
ENVI MENTAL
MANAGEMENT
COMMISSION/
NPDES UNIT
1617 MAIL SERVICE
CENTER
RALEIGH, NC
27699-1617
NOTIFICATION OF
INTENTTO ISSUE A
NPDES
WASTEWATER
PERMIT
On the basis of thor-
ough staff review and
application of NC Gen-
eral Statute 143.21,
Public law 92-500 and
other lawful standards
and regulations, the
North Carolina Envi-
ronmental Manage-
ment Commission pro-
poses, to issue a Na-
tional Pollutant Dis-
charge Elimination
System (NPDES)
wastewater discharge
permit to the person(s)
listed below effective
45 days from the pub-
lish date of the notice.
•
i CAROLINA )
:SS.
I FAX
Written comments re-
garding the proposed
permit will be ac-
cepted until 30 days
after the publish date
of this notice. All com-
ments received prior
'to that date are con-
sidered in the final de-
terminations regarding
the proposed permit.
The Director of the NC
Division of Water
Quality may decide to
hold a public meeting
for the proposed per-
mit should the Division
receive a significant
degree of public inter-
est.
)
Copies of the draft
permit and other sup-
porting information on
file used to determine
conditions present in •
the draft permit are
available upon request
and payment of the
costs of reproduction.
Mail comments and/or
requests for informa-
tion to the NC Division
of Water Quality at the
above address or call
the Point Source
Branch at (919)
733-5083, extension
363. Comments can
also be emailed to
Carolyn.Bryant@ ncma
il.net. Please include
the NPDES permit
- number (follows) in
any communication.
Interested persons
may also visit the Divi-
sion of Water Quality
at 512 N. Salisbury
Street, Raleigh, NC
27604-1148 between
the hours of 8:00 a.m.
and 5:00 p.m. to re-
view information on
file.
The Roanoke Rapids
Sanitary District
(RRSD) has applied
for renewal of NPDES
—permit NC0024201 for
its wastewater treat-
ment plant located in
Weldon, NC, Halifax
County. Since last re-
newal, this facility has
relocated its discharge
Outfall 001 to the Ro-
anoke Rapids main-
stream. Fecal coliform
and Total Residual
Chorine are water
quality limited. This
discharge may impact
future wasteload allo-
cations to the Ro-
anoke River.
April 15; 2007
:.CATHY C AIPFIEWIT OF PUE3LICATION
being first
duly swom, deposes and says: That (he) (she) is the Agent to the Publisher of the DAILY
HERALD newspapers printed and published six days a week in the County of
Halifax, State of North Carolina, and of general circulation in the dues of Roanoke
Rapids, County of Halifax, State of North Carolina and elsewhere, and Uiehere(o
attached
RR SANITARY
DISTRICT
PUBLIC NOTICE
was printed and published correctly in the regulag and entire issue of said
DAILY HERALD for 15th APRIL is u s, that the first was
made on the day of 2015 t h
and the Iasi publication thereof was trade on the day of
APRIL 07
20 that said publication
was made sile/afionthq following dates, to wit
Request of
NCDENR/DWQ/NPDES
I) ally. ller
By
Subscribed gvrprn M before me this
20
Not
My Commission Expires:
My Commission Expires November 28, 2006
15th
day of
APRIL
Public in and for the County of Halifax, Sate of N.C.

RRSD Draft NPDES NC0024201
Subject: RRSD Draft NPDES NC0024201
From: Dana Folley <[e-mail]>
Date: Fri, 13 Apr 2007 16:25:04 -0400
To: Joe Corporon <[e-mail]>
Thanks for the email and draft copies, I really appreciate being in the loop! All
looks good to me except fluoride. We will keep mercury and selenium in the LTMP - no
problem there, they have to stay because of the 503 regs anyway. But fluoride was
only in the LTMP because it was in the NPDES permit. There are no SIUs with permit
limits or significant discharge levels. So I would normally tell them they could
take it out of the LTMP since you are taking out the NPDES limit. I noted that the
RPA max predicted was just over 1 % of the allowable concentration. If you really
need me to keep it in for you I'm happy to. But they will also have to sample
influent quarterly, and the SIUs once a year. One option would be for you to put
quarterly at the effluent in the NPDES permit. Or we could take it out altogether -
both LTMP and NPDES. Let me know what you decide.
rt\- el/1,4
04-eA '>c
vu-A -c\ec
-1V
1 of 1 6/11/2007 6:53 AM

CHECKLIST FOR MUNICIPAL APPLICATION REQUIREMENTS
MUNICIPAL TYPE
EPA FORM 2A?
\
IF COMPLETING FORM 2A, DO YOU NEED THE FOLLOWING?
'
PART A -
Basic
Application
Information
PART B -
Add'l
Application
Information
(expanded
testing)
PART C -
Certification
PART D -
Priority
Pollutant
Analysis*
PART E -
TOX \ (2nd
spedtes)**
PART
SI L
Supplement
Info.
F -
s
V
Less than O.1MGD
(minor)
No (use NC Short
Form A Or Short
Form D)
No
No
No
No
No
No
Greater than/equal to
O.1 MGD but less than
1.0 MGD -- without
pretreatment
Yes
Ycs
Yes
Ycs
No
No
No
Greater than/equal to
0.1 MGD but less than
1.0 MGD -- with
pretreatment
Yes
Yes
Yes
Yes
Yes
Yes
Ycs
1.0 MGD or Greater
(major) -- without
pretreatment
Yes
Yes
Yes
Yes
Yes
Yes
No
1.0 MGD or Greater
(major) -- with
pretreatment
Yes
Yes
Yes
Yes
Yes
\'es
Yes
i
*3 samples with seasonal variation (at least 4 months separation between samples)
**4 samples with seasonal variation (for information on second species toxicity testing, call Aquatic Toxicology Unit at (919) 733-213(

NPDES REGIONAL WATER QUALITY
STAFF REPORT AND RECOMMENDATIONS
(This form is best filled out on computer, rather than hard copy)
Date: 11/30/2006
To: NPDES Discharge Permitting Unit
Attn. NPDES Reviewer:-dimi44elta r
Jc Z C'_
County: Halifax
Permitee: Roanoke Rapids Sanit Dist.
Application/ Permit No.: NC0024201
Staff Report Prepared By: Myrl Nisely
Project Name:
SOC Priority Project? (Y/N) N If Yes, SOC No.
A. GENERAL INFORMATION
1. This application is (check all that apply): ❑ New ® Renewal
❑ Modification
2. Was a site visit conducted in order to prepare this report? ® Yes or ❑ I No.
a. Date of site visit: 11/14/2006
b. Person contacted and telephone number: Greg Camp, 252-536-4884
c. Site visit conducted by: Myrl Nisely
d. Inspection Report Attached: ® Yes or ❑ No.
3. Keeping BIMS Accurate: Is the following BIMS information (a. through e. below) correct?
❑ Yes or ® No. If No, please either indicate that it is correct on the current application or the
existing permit or provide the details. If none can be supplied, please explain:
Fill this section only if BIMS or Application Info is incorrect or missinJ
Facility
a. Location Address: OK on Application ❑,
OK on Existing Permit ®, or provide Location:
b. Latitude/Longitude (These are often inaccurate) OK on Application ❑, (check at
http://topozone-.com ) OK on Existing Permit ❑, or provide Latitude: Longitude:
c. Driving Directions OK on Application ❑,
OK on Existing Permit ®, or provide Driving Directions (please be accurate):
Primary Discharge Point Location
a. USGS Quadrangle Map name and number OK on Application ❑,
OK on Existing Permit ®, or provide USGS Quadrangle Map name and number:
b. Latitude/Longitude of Outfall (These are often inaccurate) OK on Application ❑, (check at
http://topozone.com ) OK on Existing Permit ❑, or provide Latitude: 36.26.13 Longitude:
77.36.36
c. Receiving Stream OK on Application ®,
OK on Existing Permit ❑, or provide Receiving Stream or affected waters:

• NPDES REGIONAL WATER QUALITY
STAFF REPORT AND RECOMMENDATIONS
1.
a. Stream Classification: C
b. River Basin and Sub basin No.: Roanoke 23-(26)1
c. Describe receiving stream features and downstream uses: Flow altered by releases from
hydroelectric dam
For NEW FACILITIES Proceed to Section C, Evaluation and Recommendations
(For renewals or modifications continue to section B)
B. DESCRIPTION OF FACILITIES AND WASTE(S) (renewals and modifications only)
Describe the existing treatment facility: Well maintained and well run plant with complex processes
that provide good quality effluent. Since losing several industrial inputs, they at times have influent
load concentrations so low that attaining 85% removal targets can be difficult (during wet weather). A
building boom in the area (Entertainment Center, especially) is expected to help provide more even
loadings in the near future.
2. Are there appropriately certified ORCs for the facilities? ® Yes or ❑ No.
Operator in Charge: Greg Camp Certificate # 6614 (Available in BIMS or Certification Website)
Back- Operator in Charge: Greta Glover Certificate # 9924
3. Does the facility have operational or compliance problems? Please comment: No
Summarize your BIMS review of monitoring data (Notice(s) of violation within the last permit cycle;
Current enforcement action(s)): None
Are they currently under SOC, ❑ Currently under JOC, ❑ Currently under moratorium U? Have
all compliance dates/conditions in the existing permit, SOC, JOC, etc. been complied with? ❑ Yes
or ❑ No. If no, please explain:
4. Residuals Treatment: PSRP ® (Process to Significantly Reduce Pathogens, Class B) or
PFRP ❑ (Process to Further Reduce Pathogens, Class A)?
Are they liquid or dewatered to a cake? Liquid
Land Applied? Yes ® No ❑ If so, list Non -Discharge Permit No. WQ0001989
Contractor Used: Synagro
Landfilled? Yes D No If yes, where?
Other?
Adequate Digester Capacity? Yes ® No ❑ Sludge Storage Capacity? Yes ® No ❑
Please comment on current operational practices: See description at end of Attachment C of their
submittal
5. Are there any issues related to compliance/enforcement that should be resolved before issuing this
permit? ❑ Yes or ® No. If yes, please explain:
FORM: NPDES-RRO 06/03, 9/03 2

• NPDES REGIONAL WATER QUALITY
STAFF REPORT AND RECOMMENDATIONS
c EVALUATION AND RECOMMENDATIONS
1. Alternative Analysis Evaluation: has the facility evaluated the non -discharge options available? Give
regional perspective for each option evaluated:
Spray Irrigation:
Connect to Regional Sewer System:
Subsurface:
Other Disposal Options:
2. Provide any additional narrative regarding your review of the application: Meeting the redundancy
requirements is a strength in this plant - bar screens, grit chambers, clarifiers, trickling filters and a
diesel pump on standby for "high river" discharge of effluent in case of switchbox failure. Is a
reliable plant.
3. List any items that you would like NPDES Unit to obtain through an additional information
request. Make sure that you provide a reason for each item:
Recommended Additional Information
Reason
4. List specific Permit requirements that you recommend to be removed from the permit when
issued. Make sure that you provide a reason for each condition:
Recommended Removal
Reason
Pending statistical analyses, their requests for
changes in sampling seem appropriate
The change from Chockoyotte Creek to the
Roanoke River may justify the changes
5. List specific special requirements or compliance schedules that you recommend to be included in
the permit when issued. Make sure that you provide a reason for each special condition:
Recommended Addition
Reason
BIMS issue: A comprehensive listing of the all
treatment units would be helpful in BIMS.
Present description in BIMS notes only the
trickling filter
Their. suggested addition to the boilerplate (near
I suggest that this language be added to ALL
FORM: NPDES-RRO 06/03, 9/03
3

NPDES REGIONAL WATER QUALITY
STAFF REPORT AND RECOMMENDATIONS
end of the cover letter)
boilerplate sections of NPDES permits.
6. Recommendation: ❑ Hold, pending receipt and review of additional information by regional office;
Hold, pending review and approval of required additional information by NPDES permitting
office; ® Issue; ❑ Deny. If deny, please state reasons:
Reminder: attach inspection report if Yes was checked for 2 d.
7. Signature of report preparer:
a
Signature of WQS regional supervisor:
Date:
D. ADDITIONAL REGIONAL STAFF REVIEW ITEMS
4/1-4/
If next page is not used, PLEASE set printer for pages 1 through 3 to avoid wasting paper.
Use this page for facilities with more than one Discharge Pipe
Discharge Point: (Fill this section only if BIMS or Application Info is incorrect or missing)
a. Location OK on Application ❑,
OK on Existing Permit ❑, or provide Location:
b. Driving Directions OK on Application ❑,
OK on Existing Permit ❑, or provide Driving Directions (please be accurate):
c. USGS Quadrangle Map name and number OK on Application ❑,
OK on Existing Permit ❑, or provide USGS Quadrangle Map name and number:
d. Latitude/Longitude OK on Application ❑, (check at http://topozone.com These are often
inaccurate) OK on Existing Permit ❑, or provide Latitude: Longitude:
e. Receiving Stream OK on Application ❑,
OK on Existing Permit ❑, or provide Receiving Stream or affected waters:
a. Stream Classification:
b. River Basin and Sub basin No.:
c. Describe receiving stream features and downstream uses:
Discharge Point: (Fill this section only if BIMS or Application Info is incorrect or missing)
a. Location OK on Application ❑,
FORM: NPDES-RRO 06/03, 9/03 4

Roanoke Rapids Sanitary District
September 29, 2006
Charles H. Weaver, Jr.
NPDES Unit, Division of Water Quality
1617 Mail Service Center
Raleigh, North Carolina, 27699-1617
RE: Renewal of NPDES Permit Number NC0024201
Roanoke Rapids Sanitary District Wastewater Treatment Plant
NPDES Permit No. NC0024201
Dear Mr. Weaver,
1000 Jackson Sired
P. 0. Box 308
Roanoke Rapids, NC 27870
[phone]
Fax [phone]
www.rrsd_ora
Egg@mowimB
OCT 3 2006
DENR - WATER QUALITY
POINT SOURCE BRANCH
The Roanoke Rapids Sanitary District (RRSD) is permitted to discharge 8.34 million gallons per day (mgd)
of treated effluent to the Roanoke River under NPDES Permit No. NC0024201. This permit expires on
March 31, 2007. The enclosed application is for renewal of the current permit. In accordance with the
requirements of North Carolina G.S. 143.215.1(c), we are submitting one signed original and two copies of
the completed application package. The application package includes the following:
1. Completed permit application form, EPA Form 2A.
2. Attachment A: Priority Pollutant Scan Analyses (three seasonal scans)
3. Attachment B: Second Species Toxicity Tests (two tests)
4. Attachment C: Biosolids Management Description
OCT 4 2006
The third and fourth second species toxicity tests will be performed in October and December 2006. These
test results will be submitted to the Division of Water Quality (DWQ) as soon as they are received.
RRSD respectfully requests that the following issues be addressed in this permit renewal:
• The permit currently contains an effluent mercury limit of 0.868 µg/1. We have been collecting weekly
mercury samples from April 2005 to June 2005 and a monthly sample from July to the present time
(seventeen months of data). This monitoring data is provided in Table 1 and attached to this letter. Both
the effluent discharge and upstream concentrations of mercury were below the detection limit in all of
the sampling events. We request that the limit for mercury be removed from the permit. We have met
the sampling and monitoring requirements and our data shows that significant levels of mercury were
not detected in our effluent or at the upstream sampling location. We also request a reduction in the
upstream sampling frequency from monthly to quarterly if a removal of the upstream monitoring
requirement for mercury is not possible.
• We request a reduction in the frequency of upstream and downstream stream sampling events (dissolved
oxygen and temperature) from 3/week to 1/week in June, July, August, and September. Concurrently,
we would like a reduction in the upstream and downstream sampling events in the remaining months of
the year to be reduced from 1/week to 2/month. We feel that these sampling frequencies were carried
1/4

over from our prior NPDES permit allowing a discharge to Chockoyotte Creek. We feel that our recent
outfall relocation to the larger Roanoke River should warrant a reduction in upstream and downstream
monitoring frequency.
• We request the removal of monthly effluent composite sampling for copper, zinc, selenium, and
fluoride. Our Discharge Monitoring Report (DMR) data shows negligible amounts of these pollutants in
our effluent. These monitoring frequencies were originally required in the former NPDES permit
allowing a discharge to Chockoyotte Creek.
• RRSD believes it is the State of North Carolina's intention that the exclusion from sampling during
extreme weather and hazardous conditions promulgated under 15A NCAC 2B.0505(c)(4) includes
influent and effluent sampling in addition to receiving stream sampling. We request the following
language be included as a Special Condition in the NPDES permit:
"Influent and effluent sampling events may be discontinued at such times as extreme
weather conditions or other hazardous conditions (such as local flooding, high
winds, hurricanes, tornados, electrical storms, etc.) exist resulting in substantial risk
of injury or death to persons collecting samples. In such cases, on each day that
sampling is discontinued, written justification for the discontinuance shall be
specified in the monitoring report for the month in which the event occurred. l
Sampling shall be resumed at the first opportunity after the risk period has ceased.
• We request the following information as part of the draft permit preparation:
o A copy of the permit Fact Sheet.
o Documentation for any methodology, data, and assumptions used in any permit modification,
including Reasonable Potential Analyses, if applicable.
o A copy of any comments that are received from the public regarding this permit renewal, if
applicable.
We very much appreciate the time and effort of the NPDES Unit to consider our requests for this permit
renewal. Please do not hesitate to call myself (252-537-9137) or Mary Sadler with ARCADIS (919-854-
1282) if you have any questions.
Sincerely,
Roanoke Rapids Sanitary District
R. Danieley Brow P.E.
Chief Executive Officer
Attachments
cc: Gregg Camp, ORC RRSD Wastewater Treatment Plant
Gil Vinzani, DWQ, NPDES Unit Supervisor
Mary Sadler, ARCADIS
2/4

Table 1: Mercury Sampling Results for the Roanoke Rapids Sanitary District
NPDES Permit
Mercury Concentration (mg/1)
Date Upstream of Outfall 001 Outfall 001
4/18/05 < 0.0002 < 0.0002
4/29/05 < 0.0002 < 0.0002
5/4/05 < 0.0002 < 0.0002
5/12/05 < 0.0002 < 0.0002
5/19/05 < 0.0002 < 0.0002
5/26/05 < 0.0002 < 0.0002
6/2/05 < 0.0002 < 0.0002
6/7/05 < 0.0002 < 0.0002
6/15/05 < 0.0002 < 0.0002
6/22/05 < 0.0002 < 0.0002
6/29/05 < 0.0002 < 0.0002
7/7/05 < 0.0002 < 0.0002
7/11/05 < 0.0002 < 0.0002
7/19/05 < 0.0002 < 0.0002
7/27/05 < 0.0002 < 0.0002
8/3/05 < 0.0002 < 0.0002
8/10/05 < 0.0002 < 0.0002
8/17/05 < 0.0002 < 0.0002
8/25/05 < 0.0002 < 0.0002
8/31/05 < 0.0002 < 0.0002
9/8/05 < 0.0002 < 0.0002
9/14/05 < 0.0002 < 0.0002
9/21/05 < 0.0002 < 0.0002
9/28/05 < 0.0002 < 0.0002
10/5/05 < 0.0002 < 0.0002
10/12/05 < 0.0002 < 0.0002
10/19/05 < 0.0002 < 0.0002
10/26/05 < 0.0002 < 0.0002
11/2/05 < 0.0002 < 0.0002
11/7/05 < 0.0002 < 0.0002
11/16/05 < 0.0002 < 0.0002
11/22/05 < 0.0002 < 0.0002
11/30/05 < 0.0002 < 0.0002
12/7/05 < 0.0002 < 0.0002
12/19/05 < 0.0002 < 0.0002
1/4/06 < 0.0002 < 0.0002
1/9/06 < 0.0002 < 0.0002
1/19/06 < 0.0002 < 0.0002
1/24/06 < 0.0002 < 0.0002
2/ 1 /06 < 0.0002 < 0.0002
2/8/06 < 0.0002 < 0.0002
2/16/06 < 0.0002 < 0.0002
2/21/06 < 0.0002 < 0.0002
3/2/06 < 0.0002 < 0.0002
3/9/06 < 0.0002 < 0.0002
3/18/06 < 0.0002 < 0.0002
3/23/06 < 0.0002 < 0.0002
3/30/06 < 0.0002 < 0.0002
4/5/06 < 0.0002 < 0.0002
3/4

Table 1: Mercury Sampling Results for the Roanoke Rapids Sanitary District
NPDES Permit
Mercury Concentration (mg/1)
Date Upstream of Outfall 001 Outfall 001
4/11/06 < 0.0002 < 0.0002
4/19/06 < 0.0002 < 0.0002
4/27/06 < 0.0002 < 0.0002
5/2/06 < 0.0002 < 0.0002
5/11/06 < 0.0002 < 0.0002
5/18/06 < 0.0002 < 0.0002
5/224/06 < 0.0002 < 0.0002
6/1/06 < 0.0002 < 0.0002
6/7/06 < 0.0002 < 0.0002
6/15/06 <0.0002 <0.0002
6/21/06 <0.0002 <0.0002
6/29/06 <0.0002 <0.0002
7/5/06 <0.0002 <0.0002
8/7/06 < 0.0002 <0.0002
4/4

ti
• 1 VW Ilk. l`6
• } s �s?
di
Roanoke Rapids Sanitary District — NC0024201
USGS Quad Name: Weldon
Receiving Stream: Roanoke River
Stream Class: C
Subbasin: Roanoke — 030208
Lat: 36°26' 10"
Long: 77°36'04"-
� �U iscfiaQGE
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PLANT SITE PUN
R ANOKE RAPIDS SANITARY DISTRICT
WASTEWATER 1REAT) ENT PLANT
ARCADIS

CHOCKOi01TE
CREEK OUTFAIl
RIPER *MALL
ONERSOIN
BOX
ifLUENT EQUALIZATION
BLOWERS
MANUAL
BAR SCREEN A!R
WHAM
BAR SCREEN
DEMON TO
ROANOKE RNER
GRIT
CHAMBERS
OJfRi1.bW TO
MAHDKE RNIR
!MARY SLUDGE
PRWARY SLUDGE
PUMP SWIM
PUMPSIA110N
4 PUMPS
O SUPERNATANT
0 MANAGE FROM
DRYING BEDS
WAS
PUUIP STATION
2 PUMPS
PROM&
CLAIMERS
SUPERNATANT
WAS GRAVITY
T I1 HERS
WRUNG
FILTERS
FILTER
RECNOAAMN
RAIP STAT)O N
3 PIPS
WAS DRUM
UEXENER
SUPERNATANT 0 SUPERNATANT
2 PRISPRY
ANAEROBIC
DIGESTERS
1 SECONDARY
ANAEROBIC
IXGESIER
0
PETER EFFWENT
Pi14P PIMPS
UNE
STAB J7A1lON
WITTY
DIGESTED SLUDGE
DIGESTED SLUICE
SLUDGE
11WNG
TAWS
AMEN
TANKS
FN�IL
CUIRIFERS
RAS PULP
STATION
LAND APPUCADON
DEOE
CHLORINAToRalehEN
SWDGE ORYNG EIC6 ORNIAGE " O
LEGEND
NO . OPERATION
MERIATTTNT OPERATION
METERING
DLSCNAREE TO
ROANOKE RIVER
FLOOD
PUMP STATION
3 PUMPS
M ARGE TO • -
ROAM WEN
PLANT FLOW SCHEMATIC
ROANOKE RAPIDS SANITARY DISTRICT
WASTEWATER TREATMENT P1ANT
ARCADIS

i
Al
Process Narrative
Influent flow enters the Roanoke Rapids Wastewater Treatment Plant (WWTP) via two outfalls: the
Chockoyotte Creek Outfall and the River Outfall. Both outfalls combine in a diversion box prior to
mechanical screening and grit removal. Influent flow may be routed to influent equalization, when
necessary. The influent wastewater is lifted via an influent pump station to primary clarifiers. Primary
clarified effluent gravity flows to trickling filters. Trickling filter effluent is pumped to aeration tanks for
further secondary treatment. The mixed liquor then flows to final clarifiers. Clarified effluent is then
chlorinated and dechlorinated. Effluent flow is measured prior to discharge to the Roanoke River.
An effluent flood pump station is used to pump to the Roanoke when flow by gravity may not be
achieved.
The solids handling process description is provided in Attachment C.
NPDES FORM 2A Additional Information

ATTACHMENT C
ROANOKE RAPDIS SANITARY DISTRICT
BIOSOLIDS MANAGEMENT DESCRIPTION
/ Primary Sludge
Primary sludge is anaerobically digested in two primary digesters followed by one secondary
digester. Digested sludge is discharge to sludge holding tanks. Digested primary sludge can be
discharged to sludge drying beds if the holding tanks are full.
PAvl
d
Waste Activated Sludge
Waste activated sludge is pumped to gravity thickeners. Following gravity thickening, the sludge
can be further thickened if needed by use of a drum thickener. Polymer is added to aid in
thickening. The thickened waste activated sludge is lime stabilized and discharged to sludge
holding tanks. Lime stabilized waste activated sludge can be discharged to sludge drying beds if
the holding tanks. are full.
Land Apnlication
Sludge is beneficially reused through land application by a licensed sludge hauler under contract to
the Roanoke Rapids Sanitary District.
Streams Recirculated to the Treatment Process
Supernatant from the anaerobic digesters and drainage from the sludge drying beds are returned to
the treatment process upstream of the primary clarifiers. Supernatant from the gravity thickeners
and drum thickener is returned to the treatment process upstream of the trickling filters.

ATTACHMENT C
Biosolids Program
Roanoke Rapids Sanitary District
NPDES Permit No. NC0024201
Land Application Permit No. WQ0001989
Synagro Southeast, Inc. manages land application of residuals. The Roanoke
Rapids Sanitary District holds the land application permit and provides a
licensed ORC and back-up ORC as required. Synagro Southeast, Inc. provides
transport and application equipment and personnel. District personnel perform
all treatment of residuals.
At present, the District has permitted approximately 3142 acres of private
farmland and 91 acres of self owned land for residual application.
Approximately 2,800,000 gallons of -4% solids is applied to an estimated 175
acres per year. Soil pH is adjusted to achieve a soil pH as specified by permit
conditions.
The last plant addition, which provided treatment capacity, occurred in 1983;
however, several upgrades have been added since that date specifically for the
solids program. A system to thicken WAS from the 0.5% solids range to the 3-
4% solids range was accomplished by the addition of two gravity thickeners and
a drum concentrator. Pathogen reduction for WAS was accomplished by
adding a lime stabilization, mixing, and holding system to maintain proper pH
control. Primary solids are treated through three anaerobic digesters with
solids either dried on drying beds or stored for liquid application. Storage of
treated solids was provided by the addition of an above ground 1.0 MG tank
and by retrofitting two abandoned clarifiers adding 0.375 MG each to provide a
total of 1.75 MG storage.
The District utilizes final alkaline stabilization of waste activated sludge and
anaerobic digested primary sludge in order to meet pathogen and vector
reduction requirements. The alkaline stabilization process and anaerobic
digested primary sludge meets all requirements for pathogen and vector
attraction reduction for Class B biosolids.
Roanoke Rapids Sanitary District
. D nieley Br$wn, P.E.
Chief Executive Officer