NC0020761_INSTREAM ASSESSMENT_19950412

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MPDES ®®C1 WEMT SCAMMIM i COVER SMEET
NPDES Permit: NCO020761
North Wilkesboro / Thurman St WWTP
Document Type: Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Engineering Alternatives Analysis
201 EaErlties-P-la-�
� Ans=tre m•�issessme�n�t6�7B .
Correspondence re: draft permit
Permit History Date Range:
Document Date: rilt�l2199,
3`has docuaneat is prizitea oa reuse paper-i@ziore aaiy
coateat on the reverse side

DMSION OF ENVIRONMENTAL MANAGEMENT
Water Quality
April 12, 1995
Memorandum
To: Steve Mauney
From: +Carla Sanderson
Through: Ruth Swanek? )
Subject: Renegotiated SOC EMC WQ#94-25
Town of North Wilkesboro WWTP
NPDES Permit#NCO020761
Wilkes County
Summary and Recommendations
A second SOC request has been made by the WSRO concerning the subject facility's need
to increase flows to the plant while not meeting a fecal coliform limit In December 1994,
the Instream Assessment Unit completed review of the previous SOC request to relax the
fecal coliform requirements (no limit) and allow additional flow (100,000 gpd) to the plant
The previously requested SOC kept the effluent flow below the pemritted flow limit of 1.0
MGD. For this SOC the region has requested a flow limit of 1.2 MGD (due to possible
flows above 1.0 MGD from I&I)with no fecal limit A flow limit of 1.2 MGD is over the
permitted flow of 1.0 MGD. The facility will need to receive a formal permit for the
increased flow by the end of the order, or return to the original permitted flow of
1.0 MGD.
Analysis and Discussion
At the time of the first SOC request,the Town proposed to install the chlorination units
immediately and then expand the wastewater treatment plant. In order to save money and
not duplicate efforts the SOC is being renegotiated so the Town can build the expanded
plant and then add chlorination facilities for the expansion flow. This renegotiated SOC
request is for adding 100,000 gallons per day bringing the flow up to 0.9066 MGD yearly
average. This flow is larger than the previously requested post-SOC flow since the most
recent monthly averages exceed 0.80 MGD.
As part of this instream assessment, an allowable coliform count was determined given the
instream standard of 200/100 ml, 1.2 MGD of wasteflow and a 7Q10 of 196 cfs. Using
dilution,the facility's allowable total fecal coliform count would be 21,275/100 ml. The
most current DMR effluent data(2/94-1/95) show fecal counts to be as high as
540,000/100 ml for a daily maximum and up to 74,728/100 ml for a monthly average.
DMR Instream fecal data indicate that the instream standard of 200/100 ml is already being
violated. Therefore, the allowable level for this discharge is 200/100 ml which is also the
permit limit
cc: Dennis Ramsey- George Smith -WSRO
Jeff Bouchelle Central Files

r
State of North Carolina
Department of Environment,
Health and Natural Resources • •
Division of Environmental Management
James B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary ED FEE Fla
A. Preston Howard, Jr., P.E., Director
March 10, 1995
Nk. Samuel W. Msenheimer, Town Manager I AR 1 3 191
Town of North Wilkesboro
P. O. Box 218 - .. ,•r.
North Wilkesboro, North Carolina 28659
SUBJECT: Town of North Wilkesboro
Wastewater Treatment Facilities
In-Progress Plan Review
Conference
Dear Mr. Misenheimer:
This is to advise of the State requirement that final plans, specifications and
supporting design data must be submitted for State review and approval, before State
loan funding can be approved for the subject project. In accordance with the
established schedules, the complete/final plans and specifications should be submitted
by June 1, 1995 in order comply with the rules governing the State Clean Water
Bond Loan Program
A review of the plans, specifications, supporting documents and checklist (see
below) in conference with the Town of North Wilkesboro's authorized representative
and the Consultant Engineer at the 10% and 50% level of completion is required.
The 10% In-Progress Plan review conference should be held in ril 1995.
Therefore, when the detailed project design with preliminary plans and specifications
is initiated, you or your engineer must advise us of the time and date chosen in April
for the 10% "In-Progress" plan review conference as soon as possible. The
attendance of the Town of North Wilkesboro's authorized representative at the 10%
In-Progress conference is required; and the conference is not to be scheduled until this
person can be present.
Attached is the "In-Progress Review Checklist" which includes review items to
be discussed in our 10% and 50% conferences with you and the consulting engineer.
You and your consultant engineer should review this prior to our conference, so that
any questions can be resolved; or any needed clarification/information can be
provided during this conference.
P.O. Box 29535,Raleigh,North Carolina 27626-0535 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50%recycled/ 10%post-consumer paper

- 2 -
Three (3) sets of the initial plan details and complete design basis are to be
submitted at the 10% review conference; and for the 50% review conference, three (3)
sets of the plans/specifications, final design basis and an up-dated cost estimate are to
be presented.
The 10% and 50% In-Progress Reviews of the plan documents are required in
order to obtain the following:
1. Every effort must be taken to prevent bid overruis, since a project is not
to receive loan funding in excess of that established on the priority list for
the project. It is the Recipient's sole responsibility to see that the project
is designed in such a manner as to stay within the established funding
limit. If bids exceed the loan amount, the Recipient must pay the
additional amount; or redesign and rebid the project to get within the
funded amount. If a JOC/SOC schedule is involved and is not extendable,
then Recipient must proceed with award of bid(s) or be subject to the fine
amount stipulated in order; and possible loss of loan funds.
2. A timely submittal of final plans, specifications and
supporting documents which are final and complete in all respects,
including:
a. In complete compliance with Loan conditions, the 201
Facilities Plan, and any contingencies imposed on the design by the
environmental review.
b. Compliance with State regulatory requirements.
3. Clear, precise and complete plan documents for the
Biddability/Constuctibility review, for which a review period or thirty
(30) days is required.
4. Prompt resolution of other Agency review comments which could
result in lengthy delays in plan processing and approval.
5. Mutual understanding and effort by all parties to coordinate and maintain
processing of project plan documents to meet target dates designated for
the anticipated State funding.

- 3 -
If a new or revised NPDES Permit is required for the subject facilities, it is
imperative that you take this action immediately by making application to Mr. Lang
Coble, Regional Supervisor, Division of Environmental Management, Winston-Salem
Regional Office. Your project plans cannot be approved until a Permit has been
issued. Please note that the processing and issuance of a Permit will normally take
six (6) months, but can take as much as nine (9) months.
The Recipient and consultant engineer must adhere to the schedules for
obtaining the NPDES Permit, complying with JOC/SOC and submission of final plans
and specifications in order that all other established schedules can be met. The plans
and specifications are due by the submittal date if funding is to be secured during this
review period.
If there are any questions concerning this matter, please do not hesitate to
contact
Mr. Bennie Goetze, Jr., the State Project Review Engineer, at [phone],
extension 625.
Sincerely,
W. S. Hoffman, Supervisor
Construction Grants & Loans Section
Design Management Unit
Attachment
BG:vk
cc: Finkbeiner, Pettis & Strout
Winston-Salem Regional Office
Mr. Allen Wahab
Mr. Joe Martin
Mr. Tom Fahnestock
Ms. Colleen Sullins
Mr. Donald Safrit
W.--Ruth_Swanek-D
Mr. Bennie Goetze, Jr.
DMU
SBF

WS REGIONPL OFFICE Fax:[phone] Mar 22 '95 8:54 P.01iO4
FAX
NORTH CAROLINA DEPARTMENT.OF EIVVIRONMLNTP
HEALTH AND NATURAL RESOURCES
585 Waughtown Street
Winston-Salem,N.C. 27107
TEA [phone]
FAM [phone]
FROM:
NAME:
DATE; 3- 2 2- qS #OF PAGEg(including this page)
TO:
NAME
COMPANY
ADDPX"
FAX# I - 7 3 - qql
NOTE:
4--71j

US REGIONRL OFFICE Fax:[phone] Mar 22 '95 8:55 P.02iO4
Division of Environmental Management
Water Quality Section
March 21, 1995
MEMORANDUM
TO: Carla Sanderson
THROUGH: Steve Mauney - Water Quality Supervisor
FROM: George Smith
SUBJECT: In=stream assessment
North Wilkesboro WWTP
NPDES Permit Y NCO020761
Wilkes County
The subject facility is negotiating a SOC, EMC WQ # 94-25. On
November 18, 1994 this office requested an in-stream assessment and
received a summary & recommendation from Michelle Wilson on
December 20, 1994 . This assessment was submitted with a request to
waive the Fecal Coliform limit.
We are submitting a new assessment requesting a SOC flow limit of
1 .2 MGD. The current permitted capacity is 1 .0 MGD. The request to.
. waive the Fecal Coliform limit is also submitted.
If you have any questions please call.

WS REOIONFL OFFICE Fax:[phone] Mar 22 '95 8:55 P.03iO4
R• uest lore for In-stream Assessment for 67E
HAMS OF PACILITY�Nt7 T ;yA/I k�FSB_0_12n u/w SUE9ASIN
COUNTY WII kES REGION W.SRn VZSIGN rLow 1.0 I'9C0
RECEIVING STREAM_ yQQkL&--RLV Q__f—
BACKGROUND DATA :
A, wby is HOC needed? (pacility is out of compliance with which
effluent limits?) FLO W
FEdaL 6a)FORM
S. History of HOC requests:
1. Monthly Average waste flow D 6 mqd
prior to any SOC _
Time period averaged Fig, tbru [
-� 2. Previously approved SOC' ms
Dates flow: mgd
Date: flow: —mqd
total of previously approved SOC flow:_ —......_-rmgd
3. Flows lost from plant flow+ __..-.mgd
(facilities that have gone
off line)
4 . Current s0C request fIow:_Q. L!2 QQ_—mgd
S. Total plant flow post=SOC
(sum of original flow and SOC flow m flowinus losses) (T+N) mgd
6. Is this an accurate flow balance for plant? Why/why not?

WS REOICNRL OFFICE Fax:[phone] Mar 22 '95 8:56 P.04iO4
C. !lease attach DMR summary for past year for oil permitted
pa ame
tars. If possibl*, include reports from p years
facility has been under SOC for more than a year.
'CURRR1QT _ 9OC REQUEST e
,
1►. Request is for domestic or industrial vast*? If it is a combin-
at
i
o
n, please specify percentages.
100) 000 9Pd
s. What type of industry? please attach any pertinent data.
N/q
C. The region proposes the following SOC "a"as
GODS 20. 0 _mg/1
V93 mg/1
DO mq/1
TSS 0, mg/1
fecal coliform_ 4/100m1
Su
other ------
D . What is the basis for these limits?
• �) �Cta�•[- /'gc/4L ' C-}l.rpw�r�t .`'`r"�' 'cd' .���.d-G�.� .
f „,ac� on D Yr)R'- . .

DMSION OF ENVIRONMENTAL MANAGEMENT W`1A _�t;
February 28, 1995 �\ 0- CON
r)\eU
Memorandum
To: Monica Swihart ck
k�C
0
Through: Don S tRuth-S. e5
Carla Sanderson
From: Susan A. Wilson
Subject: North Wilkesboro WWTP Expansion
Revised 201 Facilities Plan/Project No. 697
NCO020761
Wilkes County
The Technical Support Branch (TSB) has reviewed the revised 201 Plan for the proposed
North Wilkesboro Wastewater Treatment Plant expansion from 1 MGD to 2 MGD. The
following comments are offered for the Town's further consideration:
• Connection of the Town of North Wilkesboro to a "regional facility dt the Town of
Wilkesboro's wastewater treatment plant should he evaluated further. The Town of
Wilkesboro is approaching 80% capacity of the current permitted flow and has
requested speculative limits for expansion of the wastewater treatment plant With this
planned expansion, North Wilkesboro may only incur the cost of user fee, force main,
and pumping station modification. Technical Support suggests that the Town of North
Wilkesboro confer with Wilkesboro regarding this matter. Due to the close proximity
of the two facilities,the option for a combined regional facility is preferred by Technical
Support.
• Because Carolina Mirror would constitute the majority of flow for the expansion, the
Town may.wish to seek a Notice of Intent from Carolina Mirror for their commitment
to connect to the proposed plant, should the expansion be approved.
• Technical Support continues to have concerns regarding the North Wilkesboro-
Mulberry WWTP. The plant is currently underloaded and therefore not operating at
maximum efficiency, although current NPDES limits are being met The 201 Plan
indicates that industrial growth may occur in the Mulberry WWTP area and this growth
could connect to the,Mulberry plant This package plant may not be capable of
adequately treating industrial waste. If industrial strength waste is added to this plant
the NPDES permit would have to be modified to reflect the nature of the wastestream
from this plant. The costs incurred from increased monitoring and testing may force
the Town to reconsider the possibility of connection to the Thurman Street WWTP.
Technical Support urges the Town to further conisder any options to connect the
Mulberry WWTP flow to the Thurman Street plant
cc: Steve Mauney,WSRO Central Files

DIVISION OF ENVIRONMENTAL MANAGEMENT
December 20, 1994
MEMORANDUM
TO: Steve Mauney
THROUGH: Ruth Swanek �
Carla Sanderson
FROM: Michelle Wilson
SUBJECT: SOC Instream Assessment for EMC WQ 94-25
Town of North Wilkesboro WWTP
NPDES No. NC0020761
Wilkes County
Summary and Recommendations:
The Technical Support Branch has completed the instream assessment for the Town
of North Wilkesboro WWTP. The Town of North Wilkesboro will be out of compliance
with its NPDES permit limit for fecal coliform. Part III, Condition G of the Town of
North Wilkesboro's NPDES permit requires the permittee to submit to the Division a
request for an Authorization to Construct(A to C) a disinfection unit at the subject treatment
facility within three (3) months of the date of issuance of their permit or by September 1,
1994. Upon receiving an A to C for such units, the permittee shall have six (6) months to
achieve full compliance with all fecal coliform limits. As of December 6, 1994, the
Division has not received an A to C for chlorination/dechlorination treatment facilities from
the permittee.
The permittee is requesting an SOC for its chlorination requirements. The Town
decided to implement a major renovation and expansion to the permitted wastewater
treatment plant. The major improvements include the construction of the chlorination
facilities. The SOC is requested to allow the construction of these facilities to occur as a
portion of the major construction project. The construction of the improvements project
will require approximately 24 months to complete. Specifications will require the
chlorination/dechlorination work to be scheduled as soon as possible so that the impact of
the lack of these facilities will be minimized. Until the facilities are complete, the plant will
not be able to meet the fecal coliform limit. The wastewater treatment plant is currently
meeting all other permit requirements. Construction of the improvements is expected to
begin on September 1, 1995 and continue until August 31, 1997.
In order to determine allowable levels of fecal coliform in the Town of North
Wilkesboro's effluent[instream data were reviewed. The background instream fecal
concentrations were taken from N. Wilkesboro's DMR upstream data. The facility stopped
reporting instream concentrations in May 1994, because its new permit does not require
them to conduct any instream monitoring. Most upstream recorded values were greater
than the WQ standard for fecal coliform. From September 1993 to May 1994, the
upstream daily maximum concentration was 38,000/100m1 and the maximum upstream
geometric mean is 3576/100m1 in December 1993. The minimum upstream geometric
mean is 303/100ml in May 1994. Therefore, a level of 200/100ml would be the required

effluent concentration to avoid further instream impairment. An effluent discharge of fecal
levels greater than the standard would constitute significant degradation according to the 67
(b) EMC guidelines, outlined in NCAC 2H. 1206(d) (1) (E) (iii), because of the prediction
to exceed the water quality standard. If zero background levels are assumed the allowabble
effluent concentrations is 31,800/100 ml.
Background Information:
The Town of North Wilkesboro WWTP discharges into the Yadkin River. The
Yadkin River is the major drainage way of the northwest piedmont and its uses are
consistent with its Class "C" designation. The river drains approximately 526 square
miles at the discharge site. In 1983, the United States Geological Survey determined the
following flows at the discharge site: summer 7Q10 = 196 cfs, winter 7Q10 = 267 cfs,
and average flow = 683 cfs. The Yadkin River changes to WS-IV waters 7.8 miles
downstream from the discharge. The river is fast moving with a stream bed gradient of
about 3 feet per mile.
As a part of the new NPDES permit, the Town is now required to chlorinate and
dechlorinate its effluent. A compliance schedule was developed in June 1994 to install the
needed facilities. Since then the Town has decided to make other needed improvements at
the plant which were delineated in a Municipal Compliance Initiative (MCI) Study
performed by DEM personnel from Construction Grants and dated January, 1994. The
chlorination and dechlorination facilities will be part of the total improvements project. The
Town is requesting an SOC to delay the completion of the chlorination and dechlorination
requirements until all construction can be performed. The facility has been in compliance
with its NPDES limits except for excessive levels of effluent fecal coliform concentrations.
Daily maximum fecal colifotm concentrations as high as 400,000/100ml and monthly
averages as high as 139,900/100m1 occurred within the last year. The Town of North
Wilkesboro WWTP has only received one NOV dated November 24, 1993. This NOV
pertained mainly to three items: (1) Sludge treatment and disposal, (2) Flow measurement,
and (3) Laboratory certification. Three other items were discussed as potential problem
areas. These included: (1) Inflow/Infiltration, (2) Telemetry System, and (3) Staffing.
These items have been addressed by the Town. Sludge treatment is being enhanced with
the proposed improvements.
cc: Dennis Ramsey
George Smith-WSRO
Central Files
TefF &vchelle

I `
Lu SUMMER
PROPOSED WILKESBORO & N. WILKE
DOUBLING DESIGN CAPACITY
---------- MODEL RESULTS ----------
Discharger : WILKESBORO WWTP
Receiving Stream : YADKIN RIVER
----------------------------------------------------------------------
The End D .O. is 6 . 89 mg/l .
The End CBOD is 6 .25 mg/l .
The End NBOD is 4 .55 mg/l .
----------------------------------------------------------------------
WLA WLA WLA
DO Min CBOD NBOD DO Waste Flo
(mg/1) Milepoint Reach # (mg/1) (mg/1) (mg/1) (mgd)
------ --------- ------- ---- ---- -- ---------
Segment 1 6 . 80 1 . 70 2
Reach 1 60 . 00 49 .50 0 . 00 10 . 00000
Reach 2 45 . 00 90 . 00 0 . 00 .2 . 00000
Segment 2 7 . 39 0 . 00 1
Reach 1 45 . 00 90 . 00 0 . 00 0 . 08000
Segment 3 6 . 92 0 . 00 1
Reach 1 0 . 00 0 . 00 0 . 00 0 . 00000

*** MODEL SUMMARY DATA ***
Discharger : WILKESBORO WWTP Subbasin 0307
Receiving Stream : YADKIN RIVER Stream Class : C
Summer 7Q10 : 196 . 0 Winter 7Q10 : 267 . 0
Design Temperature : 25 . 0
ILENGTHI SLOPEI VELOCITY I DEPTHI Kd I Ed I Ka I Ka I KN I KN I KNR I KNR I SOD I SOD I
I mile I ft/mil fps I ft Idesignl @20 Idesignl @20 Idesignl @20 Idesignl @20 Idesignl 920 1
-------------------------------------------------------------------------------------------------------------------
I I I I I I I I I I I I I I I
Segment 1 1 0.651 3.101 0.973 1 3.81 1 0.29 1 0.23 1 2.96 1 2.651 0.44 1 0.30 1 0.44 1 0.00 1 0.00 1 0.00 1
Reach 1 I I I I I I I I I I I I I
-------------------------------------------------------------------------------------------------------------------
I I I I I I I I I I I I I I I
Segment 1 I 2.101 3.101 0.984 1 3.81 1 0.29 1 0.23 1 2.99 1 2.681 0.44 1 0.30 1 0.44 1 0.00 10.00 10.00 I
Reach 2 1 I I I I 1 1 1 1 1 1 1 1
-------------------------------------------------------------------------------------------------------------------
I I I I I I I I I I I I I I I
Segment 2 1 1.50I 37.00I 0.721 1 1.31 1 0.60 1 0.48 138.67 1 34.681 0.73 1 0.50 10.73 1 0.00 1 0.00 1 0.00 I
Reach 1 I I I I I I I I I I I I I
-------------------------------------------------------------------------------------------------------------------
I I I I I I I I 1 1 1 1 1 I I
Segment 3 1 2.901 3.101 1.014 13.92 10.29 1 0.23 1 3.08 1 2.771 0.44 1 0.30 1 0.44 1 0.00 1 0.00 10.00 1
Reach 1 I I I I I I I I I I I I I
-----------------------------------------------------------------------------------------------------
I Flow I CBOD I NBOD I D .O. I
I cfs I mg/1 I mg/l I mg/l I
Segment 1 Reach 1
Waste 1 15 . 500 160 . 000 1 49 . 500 I 0 . 000
Headwaters1196 . 000 I 2 . 000 1 1 . 000 I 7 . 440
Tributary 1 0 . 000 I 2 . 000 1 1 . 000 1 7 . 440
* Runoff 1 0 . 000 I 2 . 000 I 1 . 000 1 7 . 440
Segment 1 Reach 2
Waste 1 3 . 100 1 45 . 000 1 90 . 000 0 . 000
Tributary 1 0 . 000 1 2 . 000 I 1 . 000 1 7 . 440
* Runoff 1 0 . 000 1 2 . 000 1 1 . 000 7 . 440
Segment 2 Reach 1
Waste 1 0 . 124 45 . 000 190 . 000 0 . 000
Headwaters ] 18 . 000 2 . 000 I 1 . 000 7 . 440
Tributary 1 0 . 000 2 . 000 I 1 . 000 7 . 440
* Runoff 0 . 693 ] 2 . 000 I 1 . 000 1 7 . 440
Segment 3 Reach 1
Waste I 0 . 000 1 0 . 000 1 0 . 000 I 0 . 000
Headwaters1196 . 000 1 2 . 000 I 1 . 000 1 7 . 440
Tributary 1 0 . 000 1 2 . 000 1 1 . 000 1 7 . 440
* Runoff 1 0 .224 1 2 . 000 1 1 . 000 1 7 . 440

SUMMER
PROPOSED WILKESBORO & N. WILKE
DOUBLING DESIGN CAPACITY
I Seg # Reach # , I Seg Mi I D.O. I CBOD I NBOD I Flow I
1 1 0 . 00 6 . 89 6 .25 4 .55 211 .50
1 1 0 . 07 6 . 90 6 .24 4 .55 211 .50
1 1 0 . 13 6 . 90 6 .24 4 . 54 211 .50
1 1 0 . 20 6 :90 6 .23 4 .53 211 .50
1 1 0 . 26 6 . 90 6 .22 4 .52 211 .50
1 1 0 . 33 6 . 90 6 .21 4 .51 211 .50
1 1 0 . 39 6 . 90 6 .21 4 .51 211 .50
1 1 0 . 46 6 . 90 6 .20 4 .50 211 .50
1 1 0 . 52 6 . 90 6 . 19 4 . 49 211 .50
1 1 0 . 58 6 . 90 6 . 18 4 . 48 211 .50
1 1 0 . 65 6 . 90 6 . 18 4 . 47 211 .50
1 2 0 . 65 6 . 81 6 .74 5 . 71 214 . 60
1 2 0 . 86 6 . 80 6 .71 5 . 68 214 . 60
1 2 1 . 07 6 . 80 6 . 69 5 . 64 214 . 60
1 2 1 . 28 6 . 80 6 . 66 5 . 61 214 . 60
1 2 1 . 49 6 . 80 6 . 64 5 .58 214 . 60
1 2 1 . 70 6 . 80 6 . 61 5 .55 214 . 60
1 2 1 . 91 6 . 80 6 .59 5 .51 214 . 60
1 2 2 . 12 6 . 80 6 .56 5 . 48 214 . 60
1 2 2 . 33 6 . 80 6 .54 5 . 45 214 . 60
1 2 2 .54 6 . 80 6 .51 5 . 42 214 . 60
1 2 2 .75 6 . 81 6 . 49 5 . 39 214 . 60
2 1 0 . 00 7 . 39 2 .29 1 . 61 18 . 12
2 1 0 . 15 7 . 70 2 .28 1 .59 18 .23
2 1 0 . 30 7 . 89 2 .26 1 .57 18 . 33
2 1 0 . 45 8 . 01 2 . 24 1 .55 18 . 44
2 1 0 . 60 8 . 08 2 . 22 1 .54 18 .54
2 1 0 . 75 8 . 12 2 . 20 1 .52 18 . 64
2 1 0 . 90 8 . 15 2 . 18 1 .50 18 .75
2 1 1 . 05 8 . 17 2 . 17 1 . 49 18 . 85
2 1 1 .20 8 . 18 2 . 15 1 . 47 18 . 96
2 1 1 . 35 8 . 18 2 . 13 1 . 45 19 . 06
2 1 1 .50 8 . 19 2 . 12 1 . 44 19 . 16
3 1 0 . 00 6 . 92 6 . 13 5 . 07 233 . 76
3 1 0 .29 6 . 92 6 . 10 5 . 03 233 . 83
3 1 0 .58 6 . 92 6 . 07 4 . 99 233 . 89
3 1 0 . 87 6 . 93 6 . 04 4 . 95 233 . 96
3 1 1 . 16 6 . 93 6 . 00 4 . 91 234 . 02
3 1 1 . 45 6 . 94 5 . 97 4 . 87 234 . 09
3 1 1 . 74 6 . 94 5 . 94 4 . 83 234 . 15
3 1 2 . 03 6 . 94 5 . 91 4 . 79 234 .22
3 1 2 . 32 6 . 95 5 . 88 4 . 75 234 .28
3 1 2 . 61 6 . 95 5 . 85 4 . 72 234 . 35
3 1 2 . 90 6 . 96 5 . 82 4 . 68 234 . 41
I Seg # I Reach # Seg Mi I D.O . I CBOD I NBOD I Flow I

DIVISION OF ENVIRONMENTAL MANAGEMENT
November 28, 1994
MEMORANDUM
TO: Monica Swihart
FROM Michelle—Wilson%/fV
THRU: Ruth Swanek ! �~
Carla SandersonP(.S CV'
SUBJECT: North Wilkesboro Wastewater Treatment Plant
Environmental Assessment
NPDES NCO021717
Wilkes County Yadkin 03-07-01
The instream Assessment Unit has reviewed the Environmental
Assessment (EA) prepared by Finkbeiner, Pettis & Strout, Limited for
the expansion of the Town of North Wilkesboro wastewater
treatment plant. This document makes reference to an updated
version of North Wilkesboro 201 facilities plan; however, this plan
has not been submitted for review yet. Assuming the revised 201
facilities plan does contain a more in-depth discussion of the
alternatives and Wilkesboro WWTP is not going to expand within the
near future, the draft EA addresses all the concerns of the instream
assessment unit.
Thank you for the opportunity to comment on the draft
Environmental Assessment. Please let me know if I can be of any
further assistance in this manner.
cc: Winston-Salem Regional Office
Permits and Engineering
Central Files

Request Form' for In-stream Assessment for 67D
NAME OF FACILITY Nc�RT������ ES8�P0 �1LL� SUBBASIN
COUNTY WILKES REGION \A/,�R0 DESIGN FLOW f .0
RECEIVING STREAM R I V ER
BACKGROUND DATA :
A. Why is SOC needed? (Facility is out of compliance with which
effluent limits?) _ Seca e n
B. History of SOC requests:
1. Monthly Average waste flow prior to any SOC _ ___s2 n
• 7007- mgd
Time period averaged SFpT. Igc(,�? thru UG. 91 y�I
2 . Previously approved SOC' s:
Date: flow: mgd
Date : flow: __—_mgd
total of previously approved SOC flow:_________mgd
3 . Flows lost from plant flow: mgd
(facilities that have gone
off line)
4 . Current SOC request flow:__ QQ��_mgd
5. Total plant flow post-SOC
(sum of original flow and
SOC flow minus losses) flow:__0 _0QQZ -mgd
6. Is this an accurate flow balance for plant? Why/why not?
��
1

C. Please attach DMR summary for past year for all permitted parame-
ters. If possible, include reports from previous years if
facility has been under SOC for more than a year.
CURRENT _ SOC REQUEST s
L. Request is for domestic or industrial waste? If it is a combin-
ation, please specify percentages.
H. What type of industry? Please attach any pertinent data.
N 1#
C. The region proposes the following SOC limits
HODS 30. 0 mg/1
NH3 mg/1
DO mg/l
TSS 2 O. (7 mg/1
fecal coliform—//�/ O �gl/71l^t/100ml
SU
other
D. What is the basis for these limits? _,.,p
_ H/— ,Qt-o-Cc�-�- /�-A -L ii�1C� LI.v" i1 ,E-t-�-e-'�-

State of North Carolina
{�' Department of Environment,
Health and Natural Resources . 17
Division of Environmental Management
James B. Hunt, Jr., Governor ads ���
Jonathan B. Howes, Secretary E H N F�
A. Preston Howard, Jr., P.E., Director
September 12, 1994
Mr. Christopher A. Carter, Town Manager
Town of North Wilkesboro
Post Office Box 218
North Wilkesboro, North Carolina 28659
SUBJECT: Speculative Limits for Town of North Wilkesboro WWTP
NPDES Permit No. NCO021717
Wilkes County
Dear Mr.Carter:
A request per letter dated August 1, 1994, from Mr. David Hamilton for speculative
effluent limits for the proposed expansion of the North Wilkesboro WWTP from 1 MGD to
2 MGD has been evaluated by the Technical Support Branch. In order to receive final
permit limits, a formal application will have to be submitted to the Division's Permits and
Engineering Unit.
Based on available information the tentative limits for conventional constituents are:
Summer Winter
Wasteflow(MGD) 2.0 2.0
BOD5 (mg/1) 30 30
NH3N(mg/I) 9 24
TSS (mg/1) 30 30
Fecal Coliform (#/100 ml) 200 200
pH (SU) 6-9 6-9
Chlorine (ug/I) 28 28
It should be noted that the tentative NH3N limits were evaluated considering North
Wilkesboro WWTP interaction with Wilkesboro WWTP and are based on the protection of
Yadkin River against instream toxicity. North Carolina is currently evaluating all NPDES
dischargers for ammonia toxicity and following EPA guidance to protect the waters for an
instream criteria of 1 mg/I in the summer and 1.8 mgfl in the winter,under 7Q10 flow
conditions.
P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/ 10%post-consumer paper

In addition,under current Division of Environmental Management(DEM)
procedure, dechlorination and chlorine limits are now recommended for all new or
expanding dischargers proposing the use of chlorine for disinfection. An acceptable level
of chlorine in your effluent is 28 µg/1 to ensure protection against acute toxicity.
The process of chlorination/dechlorination or an alternate form of disinfection, such as
ultraviolet radiation, should allow the facility to comply with the total residual chlorine
limit.
The instream waste concentration is 2% at the expanded wasteflow of 2 MGD. A
chronic toxicity testing requirement with quarterly monitoring will become a condition of
the NPDES permit. A complete evaluation of limits and monitoring requirements for
metals and other toxicants will have to be addressed at the time of a formal NPDES
application. Information concerning these constituents is not readily available but the Town
can assume that effluent limits and/or monitoring for cadmium,chromium, nickel,lead,
cyanide, mercury, copper, zinc, and silver may be included.
It should also be noted that a facility expanding its design capacity 0.5 MGD or
more will require the preparation of an environmental document. The N.C. Environmental
Policy Act and its associated rules require that an Environmental Assessment(EA) and
Finding of No Significant Impact(FONSI) be prepared before an application for a permit
expansion is submitted. The EA should contain an analysis of available alternatives which
,./should include a thorough evaluation of non-discharge alternatives and clear justification
�
t�16 for the flow expansion. Monica Swihart of the Water Quality Planning Branch can provide j further information regarding the EA requirement.
As part of the evaluation for this expansion, the Town of Wilkesboro WWTP
discharge (which is also applying for an expansion up to 10 MGD)located less than 1 mile
upstream was included in the modeling analysis. The Division of Environmental
Management(DEM) is currently recommending regionalization for discharges to surface
waters wherever practical. In this case, DEM encourages communication between the
Town of North Wilkesboro and the Town of Wilkesboro for final discharge capabilities.
Combined wasteflows allow the Towns to pool resources to optimally operate one
treatment plant_ Operating one plant will result in one set of effluent limits with which to
comply, one pretreatment program to run, a need for one full time operator and one set of
monitoring requirements. This consolidation should allow the Towns to allocate resources
to other projects as well as benefit the environment.
DEM has implemented a statewide basin water quality management initiative. Prior
to finalization of the Yadkin River Basin Plan, a flow profile of the river will be completed
by the United States Geological Survey which may change the flow estimates at your
discharge location. Limits are subject to change based on the flow profile results. Our
schedule for implementation in the Yadkin River Basin is set for 1998. The plan will
attempt to address all sources of point and nonpoint pollutants where deemed necessary to
protect or restore water quality standards. In addressing interaction of sources,wasteload
allocations may be affected. Those facilities that already have committed to high levels of
treatment technology are least likely to be affected. The Town of North Wilkesboro may
want to consider the implementation of this basinwide strategy in planning their expansion,
as opposed to limits proposed here which only address localized receiving waters of the
Yadkin River.

This information should provide some assistance in your planning endeavors. As
previously mentioned,final NPDES effluent limitations will be determined after a formal
permit application has been submitted to the Division. If there are any additional questions
concerning this matter,please feel free to contact Ruth Swanek or Michelle Wilson of my
staff at [phone].
i
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in
Section
DLS/MMW
cc: Finkbeiner, Pettis & Strout, Limited
Winston-Salem Regional Office
Permits and Engineering Unit
Central Files

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CONSULTING ENGINEERS l� (p
ESTABLISHED 19W I � (Dy
ONE CENTERVIEW DRIVE August 1 , 1994 � the �w � {P
GREENSBORO,NC 27407
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910-855 5648 FAX I f /'II L�I3i
Ms . Ruth Swanek
Stream Modeling
DEM
NCDEHNR
P.O. Box 29535
Raleigh, NC 27626-0535
Re: North Wilkesboro, North Carolina
WWTP Improvements
Environmental Assessment
Dear Ms . Swanek:
We are preparing an Environmental Assessment on behalf of the
Town of North Wilkesboro for the expansion of their Waste Water
Treatment Plant. The Town proposes to expand from 1 .0 MGD to 2.0
MGD and wishes to obtain "speculative" limits from your office for
the new discharge permit . The current discharge permit number is
NC0020761 .
Please notify us of these speculative limits at your earliest
convenience. Thank you for your assistance.
Sincerely,
David Hamilton, P.E.
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Wilkesboro & North Wilkesboro WWTP
Yadkin River NC0021717& NC0020761
Residual Chlorine Ammonia as NH3
(summer)
7010(CFS) 196 7010(CFS) 196
DESIGN FLOW(MGD) 12 DESIGN FLOW(MGD) 12
DESIGN FLOW(CFS) 18.6 DESIGN FLOW(CFS) 18.6
STREAM STD(UG/L) 17.0 STREAM STD(MG/L) 1.0
UPS BACKGROUND LEVEL(UG/L) 0 UPS BACKGROUND LEVEL(MG/L) 0.22
IWC (%) 8.7% IWC(%) 8.7%
Allowable Concentration (ug/1) 196 Allowable Concentration(mg/1) 9
Ammonia as NH3
(winter)
7010 (CFS) q@- 2l07
Fecal Um11 200/100ml DESIGN FLOW(MGD) -2- )a
Ratio of 10.5:1 DESIGN FLOW(CFS) 18.6
STREAM STD(MG/L) 1.8
UPS BACKGROUND LEVEL(MG/L) 0.22
IWC (%) 6e�°r 6 5
Allowable Concentration(mg/1) 3 24j
w C = 7o W I bad 2Xramsiow !
W26/9,

North Wilkesboro WWTP
Yadkin River NC0020761
Residual Chlorine Ammonia as NH3
(summer)
7010(CFS) 196 7010(CFS) 196
DESIGN FLOW(MGD) 2 DESIGN FLOW(MGD) 2
DESIGN FLOW(CFS) 3.1 DESIGN FLOW(CFS) 3.1
STREAM STD(UG/L) 17.0 STREAM STD(MG/L) 1.0
UPS BACKGROUND LEVEL(UG/L) 0 UPS BACKGROUND LEVEL(MG/L) 0.22
IWC(°A) 1.6% IWC(%) 1.6%
Allowable Concentration(ug/I) 1092 Allowable Concentration(mg/1) 50
Ammonia as NH3
(winter)
7010(CFS) 267
Fecal Llmlt 2001100ml DESIGN FLOW(MGD) 2
Ratio of 63.2:1 DESIGN FLOW(CFS) 3.1
STREAM STD(MG/L) 1.8
UPS BACKGROUND LEVEL(MG/L) 0.22
IWC (%) 1.1 %
Allowable Concentration(mg/1) 138
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826194