NC0032719_Permit Issuance_20131206

NPDES DOCUMENT SCANNING COVER SHEET
NC0032719
Valhalla WTP
NPDES Permit:
Document Type:
Permit Issuance-''-,
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Technical Correction
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
December 6, 2013
This document is printed on reuse paper - iauore any
content on the reYerse side

*VA
NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Resources
Water Quality Programs
Pat McCrory • Thomas A. Reeder John E. Skvarla, III
Governor Director Secretary
December 6, 2013
Mr. Zee B. Lamb, County Manager
Chowan County Water Department
P.O. Box 1030
Edenton, North Carolina 27932
Subject: Issuance of NPDES Permit NC0032719
Valhalla WTP
Chowan County
Class PC-1 Facility
Dear Mr. Lamb:
Division personnel have reviewed and approved your application for renewal of the subject permit. Accordingly,
we are forwarding the attached NPDES discharge permit. This permit is issued pursuant to the requirements of
North Carolina General Statute 143-215.1 and the Memorandum of Agreement between North Carolina and the
U.S. Environmental Protection Agency dated October 15, 2007 (or as subsequently amended).
The permit contains the following changes from your current permit:
• The WET testing special condition was modified to require use of ceriodaphnia dubia as the test organism
while performing a Chronic toxicity test with 90% effluent.
• Effluent sampling data for copper and iron showed reasonable potential to violate Water Quality Standards.
Since both of these parameters have action level standards, monitoring shall be performed in conjuction with
Whole Effluent Toxicity (WET) tests. In accordance with the NPDES Monitoring Frequency memo dated
July 2010, the sampling frequency for both parameters was reduced to quarterly.
• Effluent sampling data for chloride showed reasonable potential to violate Water Quality Standards.. This
parameter has an action level standard and monitoring is to be performed in conjunction with Whole Effluent
Toxicity (WET) tests. This permit removes the current chloride limitation and requires that chloride be
sampled in conjunction with WET tests. See footnote #4.
• The test organism for the WET test has been changed to ceriodaphnia dubia. It has been determined that
ceriodaphnia dubia is the most sensitive test species in the receiving waters.
Note that if toxicity failures are demonstrated with the use of ceriodaphnia dubia as the test organism the
permittee shall perform a Discharge Alternatives Evaluation as described in Section A. (3).
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
Location: 512 N. Salisbury St. Raleigh, North Carolina 27604
Phone: [phone] FAX: [phone]
Internet: www.ncwaterqualitv.org
1V�o e Carolina
�tura!!y
An Equal Opportunity 1 Affirmative Action Employer

Page 2 of 2
• In accordance with the NPDES Monitoring Frequency memo dated July 2010, the sampling frequency for
chloride was reduced to quarterly.
• Monitoring for flow, pH, and dissolved oxygen was increased to 2/month per the WTP Strategy.
• Monitoring for TP and TN was reduced to quarterly in accordance with 15A NCAC 2B .0500.
• Turbidity monitoring was added in accordance with Administrative Code 15A NCAC 2B .0500 and per the
Region lV EPA letter dated 2/25/2009.
• The flow limitation was removed and composite sampling for certain parameters was added as required by
the WTP Strategy for maximum, monthly average discharge flows > 50,000 gpd.
• A TRC footnote was added to Section A.(1.) to include the following statement: Limit and
monitoring apply only if chlorine or chlorine derivatives are used for disinfection. The Division
shall consider all effluent TRC values reported below 50 µg/L to be in compliance with the permit.
However, the Permittee shall record and submit all values reported by a North Carolina certified
laboratory (including field certified), even if these values fall below 50 µg/L.
• The wording in Section A. (2.) has been changed and the following paragraph added: If the
Permittee monitors any pollutant more frequently then required by this permit, the results of such
monitoring shall be included in the calculation and reporting of the data submitted on the Discharge
Monitoring Report and all AT Forms submitted. Please review the entire section carefully.
If any parts, measurement frequencies or sampling requirements contained in this permit are unacceptable to you,
- you have the right to an adjudicatory hearing upon written request within thirty (30) clays following receipt of
this letter. This request must be in the form of a written petition, conforming to Chapter 150B of the North
Carolina General Statutes, and filed with the Office of Administrative Hearings (6714 Mail Service Center,
Raleigh, North Carolina 27699-6714). Unless such demand is made, this decision shall be fmal and binding.
Please note that this permit is not transferable except after notice to the Division. The Division may require
modification or revocation and reissuance of the permit. This permit does not affect the legal requirements to
obtain other permits which may be required by the Division of Water Resources or permits required by the
Division of Land Resources, the Coastal Area Management Act or any other Federal or Local governmental
permit that may be required.
If you have any questions concerning this permit, please contact Julie Grzyb by email ([e-mail])
or phone at [phone].
r
Enclosure: NPDES Permit NC0032719
cc: NPDES Unit
Central Files
Washington Regional Office / Surface Water Protection Section
.e-copy:
Aquatic Toxicity Unit
Harry Bailey, DWR, PWS, WaRO
Nick Lolies, Water Department Supervisor, Chowan County
erely,
omas A. Reeder

NC0032719
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER RESOURCES
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provision of North. Carolina General Statute 143-215.1, other lawful standards
and regulations promulgated and adopted by the North Carolina Environmental Management
Commission, and the Federal Water Pollution Control Act, as amended,
Chowan County Water Department
is hereby authorized to discharge wastewater from a facility located at
Valhalla Water Plant
1608 Virginia Road
Edenton
Chowan County
to receiving waters designated as unnamed tributary to Pollock Swamp in the Chowan River
Basin in accordance with effluent limitations, monitoring requirements, and other applicable
conditions set forth in Parts I, II, III and IV hereof.
This permit shall become effective January 1, 2014.
This permit and authorization to discharge shall expire at midnight on November 30, 2017.
Signed this day December 6, 2013.
ha/
V Thomas A. Reeder, Director
Division of Water Resources
By Authority of the Environmental Management Commission
Page 1 of 5

NC0032719
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.
Chowan County Water Department is hereby authorized to:
1. Continue to operate greensand and ion exchange water treatment units designed to
produce 2.3 MGD of potable water with filter backwash and softener recharge
wastewaters having a maximum, monthly average discharge of 0.055 MGD. Potable
water treatment units include:
• Six filters
• Four Ion exchange units
The facility is located at the Valhalla Water Treatment Plant, 1608 Virginia Road,
(intersection of NC Highway 32 & NCSR 1222), Edenton, Chowan County.
2. Discharge from said treatment works at the location specified on the attached map into
an unnamed tributary to Pollock Swamp, classified C-NSW in the Chowan River Basin.
Page 2 of 5

NC0032719
Part I
A (1). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
During the period beginning on the effective date of the permit and lasting until expiration, the
Permittee is authorized to discharge from outfall(s) serial number 001. Such discharges shall be limited
and monitored by the Permittee as specified below:
c , a
.CHAMACTERISTIC ,
•�x : •�' Yy,;:
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. , ;, , r r -f � .h
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- NITORING°ItF. REIVIENTS
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'Monthly,
fir. 5�
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iAverage
, Weekly
9t . 'R c
Average:
,
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Maximum ;
� Measureinent:
a Sample ,
i S+•^-: a ti.T�"Y ��'
x. r1f'.4i..r-- _.C_..•
TYPe
Sample;
9 l
Location?„
-
� .�, � .--•ry
Frequency _
;i. i
Flow2
2/Month
Instantaneous
E
Total Suspended Solids
30.0 mg/L
45.0 mg/L
2/Month
Composite
E
Total Residual Chlorin&
17.0 µg/L
2/Month
Grab
E
pH
Between 6.0 and 9.0 s.u.
2/Month
Grab
E, D
Dissolved Oxygen, mg/L
•
2/Month
Grab
E, D
Temperature, °C
Monthly
Grab
E, D
Salinity, ppt
Monthly
Composite
E, D
Conductivity, µohms/cm
Monthly
Composite
E, D
Total Dissolved Solids
Monthly
Composite
E, D
Turbidity (NTU)
Monthly
Grab
Ammonia Nitrogen, µg/L
Monthly
Composite
E
Total Copper,, µg/L
_
Quarterly
Composite
E
Total Chloride, mg/L '
Quarterly
Composite
E
Total Iron4, µg/L
Quarterly
Composite
E
Total Manganese, µg/L
Quarterly
Composite
E
Total Nitrogen, mg/L (TN)
Quarterly
Composite
E
Total Phosphorus, mg/L (TP)
Quarterly
Composite
E
Whole Effluent Toxicity5,6
Quarterly
See A.(2)
E
Notes: •
1. Sampling locations: E = Effluent, D = overflow from pond.
2. For instantaneous flow monitoring, the duration of the discharge must be reported in addition to
the total flow.
3. Limit and monitoring requirement only apply if chlorine is used for disinfection. The facility shall
report all effluent TRC values reported by a NC certified laboratory including field certified.
However, effluent values below 50 µg/L will be treated as zero for compliance purposes.
4. Samples shall be taken in conjunction with Whole Effluent Toxicity tests.
5. Chronic Toxicity (Ceriodaphnia) monitor only at 90.0%; February, May, August, November;
See Special Condition A.(2.) CHRONIC TOXICITY MONITORING (Quarterly).
6. The permittee shall assess alternatives that can eliminate Whole Effluent Toxicity failures.
See Special Condition A.(3.).
All samples collected should be of a representative discharge.
There shall be no discharge of floating solids or foam visible in other than trace amounts.
Page 3 of 5

NC0032719
A.(2.) CHRONIC TOXICITY PASS/FAIL MONITORING (QUARTERLY)
The permittee shall conduct quarterly chronic toxicity tests using test procedures outlined in the
"North Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised December 2010, or
subsequent versions.
The effluent concentration defined as treatment two in the procedure document is 90%. The testing
shall be performed as a Ceriodaphnia dubia 7-day pass/fail test. The tests will be performed during the
months of February, May, August, and November. These months signify the first month of each three
month toxicity testing quarter assigned to the facility. Effluent sampling for this testing must be
obtained during representative effluent discharge.and shall be performed at the NPDES permitted
final effluent discharge below all treatment processes.
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 TGP3B. Additionally, DWQ Form AT-1 (original) is to be sent to the following address:
Attention: North Carolina Division of Water Resources
Environmental Sciences Section
1621 Mail Service Center
Raleigh, N.C. 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 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
to the Environmental Sciences Section at the address cited above.
Should the permittee fail to monitor during a month in which toxicity monitoring is required, then
monthly monitoring will begin immediately. Upon submission of a valid test, this monthly test
requirement will revert to quarterly in the months specified above.
Should any test data from this monitoring requirement or tests performed by the North Carolina
Division of Water Resources indicate potential impacts to the receiving stream, this permit may be re-
opened and modified to include alternate monitoring requirements or limits.
If the Permittee monitors any pollutant more frequently then required by this permit, the results of
such monitoring shall be included in the calculation & reporting of the data submitted on the DMR &
all AT Forms submitted.
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.
Page 4 of 5

NC0032719
A. (3.) DISCHARGE ALTERNATIVES EVALUATION
If after performing four WET tests using ceriodaphnia dubia as specified in Section A.(2.) the
permittee demonstrates toxicity failures (2 consecutive failures at any time), the permittee shall
initiate the following evaluation.
DISCHARGE ALTERNATIVES EVALUATION:
The Permittee shall assess potential alternatives to eliminate Whole Effluent Toxicity test failures. This
evaluation shall assess the feasibility of all the following alternatives.
1. Connect discharge to a WWTP: Determine whether the wastewater can be discharged to a
wastewater treatment plant. Approval or disapproval from the plant operator
should be acquired.
2, Obtain a Non -discharge permit. Eliminate the surface water discharge by obtaining a non -
discharge permit for spray irrigation, infiltration, or subsurface disposal (on
site drainfield, infiltration gallery, injection wells).
3. Install Wastewater Treatment: Install improved wastewater treatment to enable the facility
effluent to consistently pass the WET test. If this is not technically feasible or
cost prohibitive, please explain and provide estimated costs.
4. Use Alternative Water Treatment Source: Obtain drinking water from another source (nearest
County, City, or Town or other wells) so the discharge or toxicity problem iS
eliminated.
5. Use Alternative Water Treatment Method: Install alternative and/or innovative water treatment
methods or operational improvements that do not produce toxic wastewaters.
For example, install a recycle iron/manganese filtration system with no
discharge.
6. Discharge to a Larger stream: Relocate the facility's discharge to a larger receiving stream to
eliminate or reduce toxic impacts to the stream given the increased dilution.
7. Combination of Alternatives: Employ any combination of the alternatives listed above that would
result in eliminating or decreasing toxicity until a more feasible solution
becomes available.
The evaluation shall include a present value of costs analysis for all technologically feasible options as
outlined in the Division's "Engineering Alternatives Analysis Guidance Document." This Document can
be found at: http:/ /portal.ncdenr.org/web/wq/swp/ps/npdes/permits.
This evaluation is being requested to determine whether there are any economical and technologically
feasible alternatives available to the Permittee to address aquatic toxicity in the plant effluent. If one or
two such alternatives are available to the Permittee, please identify the preferred alternative and an
estimated timeline for implementation. The Permittee shall submit the Discharge Alternatives
Evaluation to the Division along with the submission of their next permit renewal application.
Page 5 of 5

Valhalla Water Treatment Plant - NC0032719
USGS Quad Name: C32NW Valhalla, NC
Receiving Stream: UT to Pollock Swamp
Stream Class: C NSW
Subbasin: Chowan - 030104
Lat..: 36° 08' 34" N
Long.: 76° 39' 17" W
North
Not to SCALE

NCDENR/DWQ
FACT SHEET FOR NPDES PERMIT DEVELOPMENT
Valhalla Water Treatment Plant - NC0032719
Facility Name:
Chowan County - Valhalla WTP
Facility Address:
1608 Virginia Road, Edenton, NC 27932
Permitted Flow (MGD):
No limit
County:
Chowan
Facility Class:
I
Regional Office:
Washington
Pretreatment Program:
N/A
USGS Topo Quad:
C32NW
Permit Status:
Renewal
USGS Quad Name:
Valhalla
Stream Characteristics
Receiving Stream:
UT to Pollock Swamp
Drainage Area (mil):
Sub-basin/HUC:
03-01-04/ 03010203
Summer 7Q10 (cfs):
0
Stream Index Number:
26-1-1-1
Winter 7Q10 (cfs):
Stream Classification:
C-NSW
Average Flow (cfs):
303(d) Status:
Not listed
IWC %:
100
Basin:
Chowan
Permit Writer:
Julie Grzyb
Summary
Chowan County operates the Valhalla WTP which produces 2.3 MGD of potable water. The raw
water obtained from groundwater wells is first chlorinated, aerated, dosed with potassium
permanganate and then held in a 300,000 gallon detention tank for treatment. It is then
filtered and softened and sent to a 1 million gallon clearwell where it can be pumped to the
distribution system as needed. Backwash from the filters and softeners is discharged to a
settling pond which is really an impoundment resulting from a NC DOT dug out for fill. The
impoundment rarely overflows and wastewaters appear to filter through the dirt wall to other
nearby impoundments which are considered part of Pollock Swamp. The average wastewater
discharge from the water treatment units is 0.045 MGD with a maximum discharge of 0.098
MGD during the past five years. The maximum, monthly average flow during the past three
years was 0.055 MGD.
The current permit was issued in July 2008 with an expiration date of November 30, 2012. The
2008 permit has a chloride limitation of 230 mg/L. In Jan. 2010, Chowan County agreed to a
SOC which included a compliance schedule giving the permittee to April 1, 2015 to comply with
the chloride standard. The chloride limit is a chronic EPA water quality criterion and was
adopted by the state of NC as an action level standard to be implemented in conjunction with
toxicity test failures. The Valhalla WTP was failing all of its toxicity tests using ceriodaphia
dubia as the test organism. Chloride was believed to be the cause of these failures though no
toxicity identification evaluation was ever performed.
Uncertain as to whether the permittee was using the correct test organism, later in 2010,
Regional staff in the Washington Office requested that the toxicity monitoring test requirement
be re-evaluated. It was decided that an acute toxicity 24 hour pass/fail test at 90% effluent
concentration using fathead minnow could be the correct test organism if the discharge was
considered episodic. As a result, in Feb. 2010 a permit modification was issued changing the
toxicity test organism to fathead minnow. From that point on, the permittee has passed all its
Whole Effluent Toxicity tests while using the fathead minnow as the testing organism.
Discussions between ATU, NPDES and WaRO staff ensued and it was determined that this
discharge should not be considered episodic. In 2011, DWQ collected samples from the Valhalla
effluent and ran several toxicity tests using ceriodaphnia dubia. Both of these tests
demonstrated toxicity failures. ATU, NPDES, and WaRO staff decided the toxicity test organism
should be changed back to ceriodaphania dubia.
The Aquatic Toxicity Unit and NPDES are currently assessing the number of IE and membrane
WTP dischargers in the state and their impact on state waters. A uniform approach that
requires IE and membrane WTP facilities, failing toxicity tests, to evaluate discharge
alternatives to eliminate aquatic toxicity in the effluent has been developed. At this time,

NPDES Permit Fact Sheet Valhalla WTP
Page 2 NC0032719
these permittees do not have WET testing limits only monitoring requirements. However, in an
effort to address the toxicity failures, a special condition requiring a Discharge Alternatives
Evaluation is being put in IE/RO WTP permits whose effluent is demonstrating aquatic toxicity.
For this permit renewal, it is recommended that the chloride limitation be removed, the test
organism be changed back to ceriodaphnia dubia, and if toxicity test failures resume the
permittee will be required to perform a Discharge Alternatives Evaluation. The evaluation
requires that the permittee assess the most feasible and environmentally sound alternatives
available to eliminate aquatic toxicity in the effluent. This renewal will allow for the SOC to be
rescinded and gives the permittee five years to evaluate its alternative options.
Summary of Effuent Data 2008-2012
Parameter
Flow
(MGD)
TSS
(mg!L)
TDS
(mglL)
TRC
(mg1L)
Chloride
(mglL)
Copper
(ug1L)
Iron
(mg!L)
Manganese
(ug!L)
NH3-N
(mg!L)
TN
(mg1L)
TP
(mg1L)
Limit
Average
0.045
5.82
1798
37.3
542.
42.6
1032
147
0.45
0.56
0.34
Maximum
0.098
34
8800
960
2699
1320
2452
3300
1.99
1.95
11
utliers TP at 11, Mn at 3300, TRC > 900
A review of the effluent data shows significant variations in metal concentrations, TDS, and
chloride. Other than its chloride limitation the facility is in compliance with its permit.
The following changes are recommended for this permit:
• The WET testing special condition will be modified to require use of ceriodaphnia dubia
as the test organism.
• Effluent sampling data for copper and iron showed reasonable potential to violate
Water Quality Standards. Since both of these parameters have action level standards,
monitoring shall be performed in conjuction with Whole Effluent Toxicity (WET) tests.
In accordance with the NPDES Monitoring Frequency memo dated July 2010, the
sampling frequency for both parameters was reduced to quarterly.
• Effluent sampling data for chloride showed reasonable potential to violate Water
Quality Standards. This parameter has an action level standard and monitoring is to be
performed in conjuction with Whole Effluent Toxicity (WET) tests. This permit
removes the current chloride limitation from the permit and revises the WET test to
require the permittee to use ceriodaphnia dubia as the test organism. If toxicity
failures are demonstrated with the use of this test organism the permittee shall
perform a Discharge Alternatives Evaluation as described in Section A. (3). In
accordance with the NPDES Monitoring Frequency memo dated July 2010, the sampling
frequency for chloride was reduced to quarterly.
• Increase monitoring for flow, pH, and dissolved oxygen to 2/month per WTP Strategy.
• Decrease monitoring for TP and TN to quarterly in accordance with 15A NCAC 2B .0500
• Add turbidity monitoring per Region IV EPA letter and Administrative Code 15A NCAC 2B
.0500
• Remove the flow limitation and add composite sampling for certain parameters as
required by the WTP Strategy for maximum, monthly average flows > 50,000 gpd.
• Add a Discharge Alternatives Evaluation special condition to address toxicity concerns
in the wastewaters if toxicity tests fail using ceriodaphnia as the test organism.
Draft Permit to Public Notice: September 11, 2013 (estimate)
Permit Schedule to Issue: November 4, 2013 (estimate)
If you have any questions on any of the above information or on the attached permit, please
contact Julie Grzyb at [phone].
NAME:
DATE: /o)'at
No comments were received from Regional PWS or SWP staff

Valhalla
NC0032719
REASONABLE POTENTIAL ANALYSIS
Qw (MGD) = 0.06
1Q1OS(cfs)= 0.00
7Q l OS (cfs) = 0.00
7QIOW (cfs)= NO 7Q10w DATA
30Q2 (cfs) = 0.00
Avg. Stream Flow, QA (cfs) = 0.00
Receiving Stream: Pollock Swamp
WWTP/WTP Class: 1
IWC Q 1QIOS = 100.00%
IWC Q 7QI OS = 100.00%
IWC Q7Q1OW= N/A
IWC [a3 30Q2 = 100.00%
IWC Q QA = 100.00%
Stream Class: C
Outfall 001
Qw = 0.055 MGD
CHRONIC TEST CONCENTRATION = DEFAULT %
= 90 %
PARAMETER
TYPE
(1)
STANDARDS & CRITERIA (2)
L PQL I
UNITS
REASONABLE POTENTIAL RESULTS
RECOMMENDED ACTION
NC WQS /
Chronic
Applied
Standard
'/2 FAV /
Acute
IT
# Dct Max Pred Allowable Cw
Cw
Chlorides (AL)
NC
230
FW
mgfL
103
103
4,345
Acute: NO WQS
_ _ _ — — _ —
Chronic: 230
74 value(s) > Allowable Cw
RP for AL(Cu,Zn,Ag,Fe,CI) - apply Quarterly
Monitoring in conjunction with TOX Test
Copper (AL)
NC
7
FW
7.3
ug/L
56
26
6,574
Acute: 7.3
_ _ — — —
Chronic: 7.0
26 value(s) > Allowable Cw
RP for AL(Cu,Zn,Ag,Fe,CI) - apply Quarterly
Monitoring in conjunction with TOX Test
Lead
NC
25
FW
33.8
ug/L
0
0
N/A
Acute: 33.8
_ _ _ ----_ __--
Chronic: 25.0
3 samples < 5 ug/L
_---------------------_---_.
Permit issued in Aug. 2008 removed Pb monitoring
Zinc(AL)
NC
50
FW
67
ug/L
0
0
N/A
Acute: 67.0
_ _-_-___--------------_----__-_-_-_-_.
Chronic: 50.0
all < 10 ug/L from beginning of 2008
Permit issued in Aug. 2008 removed Zn monitoring
Iron
NC
1000
FW
55
55
3,727
Acute: NO WQS
---- ------------------------------
Chronic: 1000
24 value(s) > Allowable Cw
RP for AL(Cu,Zn,Ag,Fe,CI) - apply Quarterly
Monitoring in conjunction with TOX Test
Page 1 of 1
2013 RPA-Freshwater.xlsm, rpa
3/15/2013

PERMIT: NC0032719
FACILITY: Chowan County - Valhalla WTP
PARAMETER: 50050 - Flow, in conduit or thru treatment plant
0.06
Effluent
mgd
N.
0.05 - /
0.04
0.03
0.02
0.01
0
11 1 1 1 1 1 1 1 i 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 el
20 ?O 2O 2O 2O 20 20 20 20 20 20 20 2O ?O 2O 20 20 20 ?O 20 20 20 20 20 20 20 20 20 20 20 �O �O �D ,c t50 �O
09 10 7O 7O 7O 70 70 70 7O 70 70 70 70 77 7., 77 77 77 77 /7 77 77 77 77 77 4O4 4 4 4 7%5 [5 7c/ 7c5 7c3
so,7c�
715 , Ocs D�. O �� O� 0,2 7Q'7 ,7e?'O7 oe? O� 01 O� Off, O> b� 7 O,Q'4 77 7? 7 0? Oi, O O O� O� Ocg t, 74 7�.
oO oo ?� o 9 LP()v,9 VO 9 �o �0 ,9 0O V0 � Oo �',9 OO O 9 'POoo 110?49 0 ‘510 oo is o 0 Oo
DMR Date
® oat

11/06/2013 15:59 12523352953
THE DAILY ADVANCE
Q1 / ^-4,161
PAGE 01/01
The Daily Advance
215 S. Water Street
Elizabeth City, NC 27909
North Carolina
Pasquotank County
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 Maureen Brinson who being first duly sworn,
deposes and says that she Is the Manager of Accounting and
Administration of the Daily Advance engaged Ithe publicationdof e
newspaper known as The Daily Advance, published,
entered as second lass mail In the City of Elizabeth City In said County
and State; Is authorized to make this affidavit and sworn statement; that
the notice or other legal advertisement, was published In the Daily
Advance on the following dates:
SEPTEMBER 20TH, 2013
NC Division of Water Qulaity
And that the said newspaper In which such notice, paper, document, or
• legal advertisement was published was, at the time of each and every
sall of the requirements and
qualifications
pubicatio as of Section
1 97 of the er General Statues North Carolina
qualiticatio
and was a qualified newspaper within the meaning of Section 1-597 of
the General Statues of North Carolina,
Sworn to and subscribed
before me, this 6th day of
November, 2013
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THE DAILY ADVANCE
215 S. Water Street, Elizabeth City, NC 27909
FENR/DWQ/PT. SOURCE BRANCH
SPRINKLE
1617 MAIL SERVICE CENTER
RALEIGH, NC 27699-1617
PUBLISHER'S AFFIDAVIT
CopyLine:
Lines:
Total Price:
PN--NPDES Wastewater Permit
40
$140.00
**This is not a bill**
Account: 2119700 AD ID: 8230002
AD ID: 8230002
NORTH CAROLINA
PASQUOTANK COUNTY
Before the undersigned, a Notary Public of said County and State, duly commissioned, qualified and authorized by law to
administer oaths, personally appeared Maureen Brinson who being first duly sworn, deposes and says that she is the
Manager of Accounting and Administration of The Daily Advance engaged in the publication of a newspaper known as
The Daily Advance, published, issued and entered as second class mail in the City of Elizabeth City in said County and
State; is authorized to make this affidavit and sworn statement; that the notice or other legal advertisement entitled PN-
-NPDES Wastewater Permit, was published in The Daily Advance on the following dates:
Sunday, September 15, 2013 Page: D3
and that the said newspaper in which such notice,
paper, document, or legal advertisement was published
was, at the time of each and every such publication, a
newspaper meeting all of the requirements and
qualifications of Section 1-597 of the General Statutes
of North Carolina and was a qualified newspaper within
the meaning of Section 1-597 of the General Statutes of
North Carolina.
Affirmed and subscribed before me this 15 day
otary Public Signature )
17-p.
<t` PU•
B\
0••' .. ' " ' ' Louise S. Bunch
N S G �,•` (Notary Public Typed Name)
I/J:1111{t.�1
My commission expires April 3rd, 2016
Public Notice
North Carolina Environmental
Management 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 discharge
permit to the persons) 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 Division
of Water Resources (DWR) may hold a
public hearing should there be a signifi-
cant degree of public interest. Please
mail comments and/or information
requests to DWR at the above address.
interested persons may visit the DWR at
512 N. Salisbury Street, Raleigh, NC to
review information on file. Additional
information on NPDES permits and this
notice may be found on our website:
httpJ/portal.ncdenr.org/webMrg/swp/ps/
npdes/calendar, or by calling (9].9)
$07-6390. Chowan County (P.O. Box
1030, Edenton, NC 27932) has applied
for renewal of NPDES permit NC0032719
for the Valhalla Water Treatment Plant
in Chowan County. This permitted facil-
ity discharges treated wastewater to
Rockyhock Creek in the Chowan River
Basin. Currently total residual chlorine
and total chloride are water quality
limited. This discharge may affect
future allocations in this portion of the
Chowan River Basin.
9/15
J

Ai%
NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Resources
Pat McCrory Thomas A. Reeder John E. Skvaria, III
Governor Director Secretary
September 11, 2013
Mr. Zee B. Lamb, County Manager
Chowan County Water Department
P.O. Box 1030
Edenton, North Carolina 27932
Subject: Draft NPDES Permit
Permit NC0032719
Valhalla WTP
Chowan County
Facility Class I
Dear Mr. Lamb:
Enclosed with this letter is a copy of the draft permit for your facility. Please review the draft very
carefully to ensure thorough understanding of the conditions and requirements it contains.
The draft permit contains the following significant changes from your current permit:
• The WET testing special condition was modified to require use of ceriodaphnia dubia as the test
organism while performing a Chronic toxicity test with 90% effluent.
• Effluent sampling data for copper and iron showed reasonable potential to violate Water Quality
Standards. Since both of these parameters have action level standards, monitoring shall be performed in
conjuction with Whole Effluent Toxicity (WET) tests. In accordance with the NPDES Monitoring
Frequency memo dated July 2010, the sampling frequency for both parameters was reduced to quarterly.
• Effluent sampling data for chloride showed reasonable potential to violate Water Quality Standards.
This parameter has an action level standard and monitoring is to be performed in conjuction with Whole
Effluent Toxicity (WET) tests. This permit removes the current chloride limitation from the permit and
revises the WET test to require the permittee to use ceriodaphnia dubia as the test organism. If toxicity
failures are demonstrated with the use of ceriodaphnia dubia as the test organism the permittee shall
perform a Discharge Alternatives Evaluation as described in Section A. (3).
Chowan County will be given approximately one permit cycle to evaluate and document possible
treatment/discharge alternatives to eliminate aquatic toxicity. This report will be carefully reviewed by
the Division and the results will be used in the development of a compliance schedule or possible
variance request for the County. This evaluation is being requested to determine whether there are any
economical and technologically feasible alternatives available to the Permittee to comply with all NC
Water Quality Standards and Whole Effluent Toxicity tests.
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
Location: 512 N. Salisbury St. Raleigh, North Carolina 27604
Phone: [phone] FAX: [phone]
Internet: www.ncwaternuality.orq
An Equal Opportunity 1 Affirmative Action Employer
NonrthCarolina
,Naturally

Page 2 of 2
• In accordance with the NPDES Monitoring Frequency memo dated July 2010, the sampling frequency
for chloride was reduced to quarterly.
• Monitoring for flow, pH, and dissolved oxygen was increased to 2/month per the WTP Strategy.
• Monitoring for TP and TN was reduced to quarterly in accordance with 15A NCAC 2B .0500.
• Turbidity monitoring was added in accordance with Administrative Code 15A NCAC 2B .0500 and per
the Region IV EPA letter dated 2/25/2009.
• The flow limitation was removed and composite sampling for certain parameters was added as required
by the WTP Strategy for maximum, monthly average discharge flows > 50,000 gpd.
• A TRC footnote was added to Section A.(1.) to include the following statement: Limit and
monitoring apply only if chlorine or chlorine derivatives are used for disinfection. The Division
shall consider all effluent TRC values reported below 50 µg/L to be in compliance with the
permit. However, the Permittee shall record and submit all values reported by a North Carolina
certified laboratory (including field certified), even if these values fall below 50 µg/L.
• The wording in Section A. (2.) has been changed and the following paragraph added: If the
Permittee monitors any pollutant more frequently then required by this permit, the results of
such monitoring shall be included in the calculation and reporting of the data submitted on the
Discharge Monitoring Report and all AT Forms submitted. Please review the entire section
carefully.
Concurrent with this transmittal, the Division will solicit public comment on this draft as required by the
EPA by publishing a notice in newspapers having circulation in the general Chowan County area.
Please review this draft carefully to ensure thorough understanding of the information, conditions, and
requirements contained therein. Should you wish to correct errors or provide comments regarding this draft
please contact the DENR / DWQ / NPDES Program no later than October 18, 2013.
Following the 30-day public comment period, the Division will review all pertinent comments and take
appropriate action prior to issuing a final NPDES permit. If you have questions concerning the draft permit
for your facility, please contact me by e-mail ([e-mail]) or call me at [phone].
Respectfully,
lie A. fib/
nvironmental Engineer, NPDES Complex Permitting Unit
Enclosure: NPDES Permit NC0032719 (Draft permit)
cc: NPDES Unit (draft permit, fact sheet, RPA, permit application)
e-copy:
Washington Regional Office / Surface Water Protection Section
.d'IPDES, Steve Reid
Wiquatic Toxicity Unit
vAarry Bailey, DWR, PWS, WaRO
m4ick Lolies, Water Department Supervisor, Chowan County

Grzyb, Julie
From: Hollenkamp, Carol
Sent: Friday, October 04, 2013 1:38 PM
To: Grzyb, Julie; Adams, Amy; Bullock, Robert; Reid, Steve; Meadows, Susan; Moore, Cindy
Subject: RE: Draft Valhalla WTP permit (NC0032719)
Hi Julie,
Sorry for the delayed response. I have reviewed my notes, and yes, we had agreed that the correct test for the facility
should be the 7-day chronic Ceriodaphnia dubia, based on their IWC (which is 100%) and the frequency of their
discharge, which we consider to be more than episodic.
Also, just wanted to say I thought you did a great job on the discharge alternatives evaluation.
Carol Hollenkamp
Aquatic Toxicology Unit/Environmental Sciences Section
North Carolina Division of Water Resources/DENR
1621 Mail Service Center, Raleigh, NC 27699-1621
Phone: [phone]
Fax: [phone]
Website: http://portal.ncdenr.org/web/wq/ess/atu
E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be
disclosed to third parties.
From: Grzyb, Julie
Sent: Thursday, September 12, 2013 10:51 AM
To: Adams, Amy; Bullock, Robert; Reid, Steve; Meadows, Susan; Hollenkamp, Carol; Moore, Cindy
Subject: Draft Valhalla WTP permit (NC0032719)
Attached please find the Draft Valhalla WTP permit for your review.
It was sent to Public notice this week and the comment period will end October 18, 2013.
The draft fact sheet is attached as well.
Cindy, Susan, Carol and Robbie, I changed the toxicity test back to 90% chronic using ceriodaphnia dupia. Can you
please review your notes, I know I was to change it back to using that test organism and I assumed it goes back to a
chronic test. Is that correct?
Please let me know if anyone has any questions.
Thanks,
Julie
Julie A. Grzyb, Environmental Engineer
I.

NC DENR / Division of Water Resources / Surface Water Protection Section
NPDES Complex Permitting, Point Source Branch
1617 Mail Service Center, Raleigh, NC 27699-1617
919/807-6389 (wk); 919/807-6489 (fax)
[e-mail]
E-mail correspondence to and from this address may be subject to the North Carolina Public Records law and may be
disclosed to third parties.
2

WATER DEPT.
305 West Freemason Street
P.O. Box 1030
Edenton, NC 27932
[phone]
May 30, 2012
NCDENR
Division of Water Quality
Point Source Branch
1617 Mail Service Center
Raleigh, NC 27699-1617
ATT: Mrs. Dina Sprinkle
Re: County of Chowan
Valhalla WTP
NPDES Permit Renewal Package
Gentlemen:
We are herewith requesting renewal of NPDES permit # NC0032719. There have been no
changes at the facility since the last permit was issued.
Sincerely,
ee B.
County Manager

NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
Mail the complete application to:
N. C. Department of Environment and Natural Resources
Division of Water Quality / NPDES Unit
1617 Mail Service Center, Raleigh, NC 27699-1617
NPDES Permit Number
NC0032719
If you are completing this form in computer use the TAB key or the up - down arrows to move from one
field to the next. To check the boxes, click your mouse on top of the box. Otherwise, please print or type.
1. Contact Information:
Owner Name Chowan County
Facility Name Valhalla Water Treatment Plant
Mailing Address PO BOX 1030
City Edenton
State / Zip Code NC 27932
Telephone Number (252-482-7477)
Fax Number (252-482-1528)
e-mail Address [e-mail]
2. Location of facility producing discharge:
Check here if same as above 0
Street Address or State Road 1608 Virginia Rd
City
State / Zip Code
County
Edenton
NC 27932
Chowan
3. Operator Information:
Name of the firm, consultant or other entity that operates the facility. (Note that this is not referring to the
Operator in Responsible Charge or ORC)
Name Chowan County
Mailing Address PO BOX 1030
City Edenton
State / Zip Code NC 27932
Telephone Number (252-482-7477)
Fax Number (252-482-1528)
4. Ownership Status:
Federal ❑ State ❑
5. Type of treatment plant:
Private ❑ Public
Page 1 of 3 C-WTP 03/05

NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
O Conventional (Includes coagulation, flocculation, and sedimentation, usually followed by
filtration and disinfection)
® Ion Exchange (Sodium Cycle Cationic ion exchange)
❑ Green Sand Filter (No sodium recharge)
❑ Membrane Technology (RO, nanofiltration)
Check here if the treatment process also uses a water softener
6. Description of source water(s) (Le. groundwater, surface water)
Groundwater
7. Describe the treatment process(es) for the raw water:
Raw water is chloronated and aerated, potassium permangenate is added and the water is
then held in a 300,000 gallon detention tank. It is then filtered and softened. Chlorine is
added again prior to storeing it in a lmg clearwell. It is then pumped to the distribution
system as needed.
8. Describe the wastewater and the treatment process(es) for wastewater generated by the
facility:
Wastewater is generated when filters are backwashed three times per week. 80,000 gallons
of filter backwash is generated each time the filters are backwashed. The softners also
generates wastewater. Each softner is regenerated automatically. On average two of the
four softners are regenerated per day which produces 12,000 gallons of wastewater.
9. Number of separate discharge points: 1
Outfall Identification number(s) 001
10. Frequency of discharge:
Continuous ❑ Intermittent
If intermittent:
Days per week discharge occurs: 7 Duration: 1.5hrs
11. Plant design potable flowrate 2.3 MGD
Backwash or reject flow .049 MGD
12. Name of receiving stream(s) (Provide a map showing the exact location of each outfall, including
latitude and longitude
13. Please list all water treatment additives, including cleaning chemicals or disinfection
treatments, that have the potential to be discharged.
Page 2 of 3 C-WTP 03/05

NPDES PERMIT APPLICATION - SHORT FORM C - WTP
For discharges associated with water treatment plants
Chlorine Gas
Potassium Permangenate
Superfloc Filter Aid
Calcium Thiosulfate dechlorination Solution
Polyphosphate Solution
14. Is this facility located on Indian country? (check one)
Yes ❑ No
15. Additional Information:
• Provide a schematic of flow through the facility, include flow volumes at all points in
the treatment process, and point of addition of chemicals.
• Solids Handling Plan
16. NEW Applicants
Information needed in addition to items 1-15:
✓ New applicants must contact a permit coordinator with the NCDENR Customer
Service Center.
Was the Customer Service Center contacted? 0 Yes 0 No
• Analyses of source water collected
> Engineering Alternative Analysis
• Discharges from Ion Exchange and Reverse Osmosis plants shall be evaluated using a
water quality model.
17. Applicant Certification
I certify that I am familiar with the information contained in the application and that to the
best of my knowledge and belief such information is true, complete, and accurate.
Zee B. Lamb County Manager
Printed nam59t P9fso i ing Title
..5-r30-/Z.
Signaturj ' Date
North Carolina General Statute 143-215.6 (b)(2) provides that: Any person who knowingly makes any false
statement representation, or certification in any application, record, report, plan, or other document files or
required to be maintained under Article 21 or regulations of the Environmental Management Commission
implementing that Article, or who falsifies, tampers with, or knowingly renders inaccurate any recording or
monitoring device or method required to be operated or maintained under Article 21 or regulations of the
Environmental Management Commission implementing that Article, shall be guilty of a misdemeanor punishable
by a fine not to exceed $25,000, or by imprisonment not to exceed six months, or by both. (18 U.S.C. Section
1001 provides a punishment by a fme of not more than $25,000 or imprisonment not more than 5 years, or both,
for a similar offense.)
Page 3 of 3
C-WTP 03/05

CIALWAN
UUUNTY
WATER DEFT.
305 West Freemason Street
P.O. Box 1030
Edenton, NC 27932
[phone]
SLUDGE MANAGEMENT PLAN
Waste solids from the Chowan County Valhalla water treatment plant are stored in a settling
pond. Solids are periodically removed as needed by Atlantic Nutrients, Inc. and injected on the
permitted sides by Atlantic Nutrients, Inc.

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Grzyb, Julie
From: Bullock, Robert
Sent: Monday, April 09, 2012 11:20 AM
To: Grzyb, Julie
Cc: Thorpe, Roger
Subject: Valhalla WTP NC0032719
Julie,
I remember us discussing the Valhalla WTP permit and the need to have the chloride and toxicity limit removed. Do you know who is handling the permit and what the
status is on reissuing the permit? Once the limits have been removed and the permit has been issued they can request the SOC be terminated.
Thanks,
Robbie
Robbie Bullock
WWTP Consultant
252-948-3843 Phone
"E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third parties"
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