NC0020761_WASTELOAD ALLOCATION_19950703

NPDES Permit: NCO020761
North Wilkesboro / Thurman St WWTP
Document Type: Permit Issuance
asteload Allocatio
Authorization to Construct (AtC)
Permit Modification
Engineering Alternatives Analysis
201 Facilities Plan
Instream Assessment (67B)
Correspondence re: draft permit
Permit History Date Range:
Document Date: 4uly 3 199
This document is printed on reuse paper-igxaore aay
content oa the reverse side

NPDES WASTE LOAD ALLOCATION
PERMIT NO.:
NCO020761 Modeler Date Rec. #
Town of North Wilkesboro 5 S a S 30
PERMITTEE NAME: 2 pp 3
FACILITY NAME: Town of North Wilkesboro W WTP Drainage Area(mi ) $a w Avg. Streamflow (cfs): 6 p
Facility Status: Existing 7Q10 (cfs) /(o Winter 7Q 10 (cfs)1G '7 30Q2 (cfs) 31-3
Permit Status: Modification Toxicity Limits: IWC /, s % Acut Chronic
Major Minor InstreamMonitoring: Ge�rodaph/t �t . 9�aarer�y
Pipe No.: 001 Parameters Feta.fp (/�obl gi e w pd
Design Capacity: 2.0 MGD Upstream ✓ Location /00 qd9 w�
Domestic (% of Flow): 96 % Downstream ✓ Location /00 �a'f ownStnGa�nt
Industrial (% of Flow): 4 %
Effluent Summer Winter
Comments: riptj 4/ZAA5. Characteristics 7
LTi-p RCQUCSZ>) (ti rotkazi iu�y goo; Pat(ReA—,AT. BODS (mg/1) 30,-0 30, 0
P?O<F-Am� NH -N (mg/1)
3 170 . z yro
D.O. (mg/I)
RECEIVING STREAM:the Yadkin River I I '
Class: C
TSS (mg/1) -5010 3'O, 0
Sub-Basin: 03-07-01 F. Col. (/100 ml) ZOD. 0
Reference USGS Quad: C 14 NW (please attach)
County: Wilkes pH (SU)
Regional Office: Winston-Salem Regional Office r�ne
Previous Exp. Date: 4/30/99 Treatment Plant Class: III �J
T�P
Classification changes within three miles: t
none /A/ (Of A me �L
o�iU/t'/i �U / YY1,9wfU✓
Requested by: Susan A. Wilson l�� Date: 5/2/95
Prepared by: Date: 40 6 Comments:
i
Reviewed bya Date: 3 ��

y
DI
SCHARGE SERIAL NUMBER
001- - NPDES #NCO020761
a Overflow Duration Give the
average overflow durabon in
hours.
Wet weather 23901 hours
Dry weather 279Q horns
d Overflow Volume Give the
everagevolume parovedlow
Incciidenl In thousand galorut
t
Wet v�lather 209d1 fhousand gabns per'nc�ident
.. .Dryweathet ""- "-- - 2092- ---- thousarhdgaloruperihcident ._ _.
Pro eed to Item 11
10. Seasonal/Periodc Discharges .
a SeasonallPeriodcOrsduur
Frequency If dscharge is tnler- 210a tunes Per year
rritlent hum a Wdiinig pond,
lagoon,etc.,give the actual or
appro)dmab number of times
this ddscharge occurs per year.
Ix Seasonal/Penodic Doo arge 2ICb thousa d galau perducarge occurrence
Volume Give the average
volume perdsclumW
coo rrenoe in ttcusard
gallons.
o. SeasonallPenodc Discharge 210o days
Duration Give the average dura - .
Eon of each dsdange
occurrence m days .
d Seasonalperadc Discharge
Occueance*lonta Check the 21od ❑JAN ❑FEB ❑MAR
months during the year when ❑APR MAY ❑JUN
the dscharge normally occurs. ❑JUL ❑AUG ❑SEP
[]OCT [] NOV ❑ DEC
11. Discharge Treatment
a Discharge Treatment
Description
Describe waste abatement pra
tices used on this dscharge
with a brief narrative. (see Treatment consists of primary sedimentation
instructions) 211a
U inor clarifiers, follOwed by hiQ1 ical
treat-mpnt Using act 'hraf-PA sledge _fllowed by
spn nr3^ry rlarifirafinn and rhlnrinntion/: ..
derhlarination 4lhhdcle is treal-ed by
aerobic- digestion, thickening, and Dither
sludge drying on hods nr hauled away.

DISCHARGE SERIAL NUMBER ,
001 - NPDES # NC0020761
b. Discharge TreatnrentCodes 211b S G C. ASN but with JWA sLrdge return, N, PG,
Using the codes listed in Table I
of be InstructionBooWel. was e Process — D T ]3 or�—truck fill station
dasmbe the waste abatement
Processes applied to this ds- .
charge In one orderin wtnich
they occur.it possible.
Separate all codes with
• oomrnav except where slashes
• are used b designate Parallel
done.
--tt this discharge is trom a municipal waste _ - _ .-- --_—__._.--
treatp�letelpl a ntti erd t overflow OrbYP�),com -- -
12. Dock whx F`=n
currently available
a Engineering Design Report 212a Q
b. Operation and Mainlonaoe 212b ❑
Manual
13. Plant Design Data(see instructions) �� 2.000 mgd
a Plant Design Flow(mgd)
b Plant Design BOD Removal(% 213b
a Plant Design N Removal(%) 2130 --- %
d Rant Design P Removal(%) 2131 ----
a Plant Design SS Removal(%) 213e SO %
C Plant Began operation(yeA 2131 1957
g Plant Last Major Revision 213g 1974

STANDARD FORM A - MUNICIPAL
SECTION IV. INDUSTRIAL WASTE CONTRIBUTION TO MUNICIPAL SYSTEM
Submit a description of each major i&stnal facility dsaha to the murid system,using a separate Section IV for each
rga�g on(SIC Code for dw in tsre fhe mayor product or few
fad6ty descrippton. Indicate the 4 dust Standard p R��, of the wastewater discharged from the rdustiial tadity
actamatenal,the fbw(m tfrousard galbns pe ),end ft char
into the munrapa+system. Cor>StAt Table III(or alandard measures d products or raw materials. (see instirwtiorts) .
1' Majo
r
FaaTrry
(see'inflictions)
(
401a QlrC > T N5>sCa' Q>m
Name P O Bic 1570
Number&Street 401b FT)Jn j-j=J2= ,
.- ._ . city 401c Nxtll lh llca -mn -
Canty 401d -
Stete 401e
Zp Code 401f 28659
402 3231
2 Primary Standard Industrial '
Classification Code(see Instructions) -
Uras(See .
g Primary Product or Raw Material �N— Table.lin
(see instructions) ir�rrra
Product 403a M 403CI I4I .
Raw Material 403b 403d
a Row Indicate the vaWme of water
d=harqr�eedd into the municipal sys- 77.00 ____thousand gallons per day
tern in t5ousand gallons per day 404a
and whether this discharge is Continrwus(con)
intermittent or continuous. 404b Inlem mttittent( )
5 Pretreatment Provided lndcate it 405 ® Yes No .
pretreatment is provided prior to
entering the municipal system
6 Characteristics of Wastewater
(see instructions)
oFmbe
Lead Nid2l Sit
CaC�ld
406a __ 0100 01034 01 bily • / .60 .35 1.35/.82 .15 .12
7va
.im J.trm. T'H B;D ?SS FOG
01092 00010 00400 00310 00530 00556
.50/.30 1400/— 6.0 to 150/150 150/150_• 0/0
9.0

STANDARD FORM A - MUNICIPAL
SECTION III. SCHEDULED IMPROVEMENTS AND SCHEDULES OF IMPLEMENTATION
This section requires information onarry undo isd implementation schedule which has been'mposed for corsstructim of waste
6ea0nent facilities. Requirement schedules may have been established by local,Staff,a Federal ��ee or by court action. IF
YOU ARE SUBJECT TO SEVERAL DIFFERENT IMPLEMENTATION SCHE)DULES EITHER BECA�UBSSE OF DIFFERENT
SSPARATE OPERATIONAL UNITS(REM iSING ) OENT MIT A SEPAREDULES ATE SECTION01FORAGED EACH ONE-
Improvements OF
1. Improvements RKuired
a ' Discharge Serial Numbers 300
Affected list the QuchergI
serial numbers,assgn id in
Section t,that are covered by
phis inplementafion whadule
b. Authority hVosing ReOre- 3Ma fin 1
ment One*the appropriate,
item indicating the authority
for the implementation sd*dine
0 the identical implementation
schedule has been ordered by
more Phan one authority,check
the appropriate hems. (see
instructions)
Locally developed plarl 301b ❑LOC
Areawide Ran ❑ARE
Basin Plan ❑BAS
Slate approved implementation ®SOS
schedule (NPDES)
Federal approved vralarquality ❑WOS
standards implementation plan
Fde eral enfoicementprooedwe ❑ENF .
or action
Shale court order ❑CRT
Federal court order ❑FED
C. Improvement Description Soecly the 3-character code for the General Action
Description in Table II that best nbes the improvements required by the
anplementation schedule. h more than one schedule applies to the facility because
of a staoed mnshuction schedule,state the stage of construction being described
here with the appropriate general action code. Submit a separate Section III for each
stage of construction planned Also,fist all the 3-character(Specific Action)codes which
describe in more dotal the pollution abatement practices that the Implementation schedule requires.
3-cFaractergoneralaction 301c T('T
description
3character specific action 301d —DI
2 Implementation Schedule and 3. Actual Complete Dates
Provide dates imposed by schedule and arty actual dates of completion for implementation steps listed below.
Indicate dates as accurately as possible. (see instructions)
Implementation Steps 2 Schedule (yr/Mo/Day) 3. Actual Completion(Yr/Mo/Day)
a Preliminary plan complete 302a �� =la
b Anal plan complete 302b 303b
c Financing complete&contract 302; 303C -�—�
awarded
d Site acquired 302d -J—J— 303d
e. Begin construction 302e —J—J— 303e —J�—
f. End construction 3021 —J�— 3031 —J�—
g Begun discharge 3029 _J—J— 303g J�—
h Operational level attained 302h _�—J 303h —J�—
i. IttplatEr t tial Of 1995/ 3/1 rmdiXJ extais rn by BJC to Atritst 31, 1997
dari aticn/dadAa m irn for ampletim of m>31�1.
facilities

FACT SHEET FOR WASTELOAD ALLOCATION
Request#. 8302
Facility Name: Town of North Wilkesboro WWTP NPDES No.: NC0020761 RECEIVED
Type of Waste: 96% domestic,4% industrial y 3. . L c'^i • t'S
Facility Status: Existing
Permit Status: Modification J.i� 191995
Receiving Stream: Yadkin River
Stream Classification: C
Subbasin: 03-07-01
County: Wilkes Stream Cham:cr e istic
Regional Office: Winston-Salem USGS #
Requester: Susan A. Wilson Date:
Date of Request: 5/2/95 Drainage Area(mi2): 526
Topo Quad: C 14 NW Summer 7Q10 (cfs): 196
Winter 7Q10 (cfs): 267
Average Flow (cfs): 683
30Q2 (cfs): 393
IWC(%): 1.5
Wasteload Allocation Summary
(approach taken, correspondence with region, EPA, etc.)
North Wilkesboro has a permit to discharge 1.0 MGD into the Yadkin River. The City plans to
expand the plant to 2.0 MGD as well as add chlorination/dechlorination chambers. Due to the lack
of disinfection facilities the plant has been consistently out of compliance with its fecal coliform
limit. Currently, the plant is operating under an SOC for increased flow and no fecal coliform limit
until the expansion is complete round 3/30/98 (ref. May 24, 1995 staff report). Fec&`
oh_,( > 100,o00/anm.l• n5luanl dada r2parf3 y�/r es �4caG y� Q� y� s f c o
Special Schedule Requirements and additional comments from Reviewers:
Recommended by: iJ i Date: 6�9I9 S—
Reviewed by `�
Instream Assessment: �l�, E Kl(P/YIGc (/l/�flY� Date:
/y—
Regional Supervisor: _ C Date: c/,
Permits &Engineering: Date: 26 J
RETURN TO TECHNICAL SUPPORT BY: JUL 12 1995

2
CONVENTIONAL PARAMETERS
Existing Limits:
Monthly Average
Summer Winter
Wasteflow (MGD): 1.0 1.0
BOD5 (mg/l): 30.0 30.0
N113N (mg/1): monitor monitor
DO(mg/1): N/A N/A
TSS (mg/1): 30.0 30.0
Fecal Col. (/100 nil): 200.0 200.0
pH (SU): 6-9 6-9
Residual Chlorine (µg/1): N/A N/A
Oil and Grease (mg/1): N/A N/A
TP (mg/1): monitor monitor
TN(mg/1): monitor monitor
Recommended Limits:
Summer Winter Summer Winter
Wasteflow (MGD): 1.0 1.0 2.0 2.0
BOD5 (mg/1): 30.0 30.0 30.0 30.0
NH3N (mg/1): monitor monitor 9.0 24.0
DO(mg/1): N/A N/A N/A N/A
TSS (mg/1): 30.0 30.0 30.0 30.0
Fecal Col. (/100 nil): 200.0 200.0 200.0 200.0
PH (SU): 6-9 6-9 6-9 6-9
Residual Chlorine (µg/1): N/A N/A 28 28
Oil and Grease (mg/1): N/A N/A N/A N/A
TP (mg/1): monitor monitor monitor monitor
TN(mg/1): monitor monitor monitor monitor
LIMIT CHANGES DUE TO:
(explanation of any modifications to past modeling analysis including new flows,rates, field data,
interacting discharges)
Changes in wasteflow and chlorine limits reflect the planned expansion. Ammonia-N limit based
on modeling analysis in which the interaction between the North Wilkesboro WWTP and the
Wilkesboro W WTP were taken into account (ref. Letter reporting Spec. limits for the Town of N.
Wilkesboro, Sept. 12, 1994).
(See page 4 for miscellaneous and special conditions,if applicable)

3
TOXICS/METALS
Type of Toxicity Test: Chronic P/F Ceriodaphnia �?ecorv�t�rJ�y }�cn¢wi
Existing Limit: Acute 48 hr. Daphnia or Ceriodaphnia, LC 50 78%
Recommended Limit: 1.5% '( %VbVxn(, 'l/F -POV 4�ansiovll-p a.Oyyv�c�
Monitoring Schedule: Quarterly
ExistingLimits
imits
COD (mo: N/A
Cadmium(ug/1): N/A
Chromium (ug/1): N/A
Copper (ug/1): N/A
Nickel (ug/1): N/A
Lead(ug/1): N/A
Zinc (ug/1): N/A
Cyanide(ug/1): N/A
Phenols (ug/1): N/A
Mercury(ug/1): N/A
Silver(ug/1): N/A
Recommended Limits p y 0 el, 'P. 0
COD (mg0: N/A
Cadmium(ug/1): N/A
Chromium(ug/1): N/A
Copper(ug/1): N/A
Nickel (ug/1): N/A
Lead (ug/1): N/A
Zinc (ug/1): N/A
Cyanide(ug/1): N/A
Phenols (ug/1): N/A
Mercury(ug/1): N/A
Silver(ug/1): monitor
LIMIT CHANGES DUE TO:
A toxicity spreadsheet program used to predict maximum metals concentrations indicated that
instream standards would not be exceeded for any of the metals with the exception of silver. The
maximum predicted silver concentration in the effluent was calculated to be 7.46 ug/L. The
allowable silver concentration in the effluent in order to not exceed the instream action level
(0.06ug/L) was determined to be 3.9 ug/L. Since the predicted max. silver concentration is greater
than the allowable the Instream Assessment Unit recommends monitoring the Town's effluent for
silver.
The toxicity test changed from acute to chronic because increasing the discharge to 2.0 MGD from
1MGD will result in an IWC>1%.
_ Parameter(s) are water quality limited. For some parameters, the available load capacity of
the immediate receiving water will be consumed. This may affect future water quality based
effluent limitations for additional dischargers within this portion of the watershed.

4
OR
No parameters are water quality limited, but this discharge may affect future allocations.
INSTREAM MONITORING REQUIREMENTS
Upstream Location: 100 yds from outfall
Downstream Location: 100 yds from outfall
Parameters: fecal coliform
Special instream monitoring locations or monitoring frequencies:
MISCELLANEOUS INFORMATION&SPECIAL CONDITIONS
Adequacy of Existing Treatment
Has the facility demonstrated the ability to meet the proposed new limits with existing treatment
facilities? Yes_ No_t,-�
If no,which parameters cannot be met? FEGRL LOLI FORM _ FLOw
Would a "phasing in" of the new limits be appropriate? Yes ✓ No
If yes, please provide a schedule (and basis for that schedule) with the regional
office recommendations:
4Y-25
v�
Mu I /Y9F
If no, why not? -yr
Special Instructions or Conditions
Wasteload sent to EPA? (Major)_(Y or N)
(If yes, then attach schematic, toxics spreadsheet, copy of model, or, if not modeled, then old
assumptions that were made, and description of how it fits into basinwide plan)
Additional Information attached? (Y or N) If yes, explain with attachments.
FmcC wQ 9y-2s

r 1
Facility Name luon o /t/. u),166 bw Pemut# 07G Pipe#
ACUTE TOXICITY PERMIT LIMIT (QRTRLY)
The permittee shall conduct acute toxicity tests on a quarterly basis using protocols defined as definitive in E.P.A.
Document 600/4-85/013 entitled "The Acute Toxicity of Effluents to Freshwater and Marine Organisms." The
monitoring shall be performed as a Daphnia pulex or Ceriodaphnia 48 hour static test, using effluent collected as a
24 hour composite. The LC50 of this effluent using the previously stated methodology may at no time in any
toxicity test be less than%a. Effluent samples for self-monitoring purposes must be obtained during
representative effluent discharge below all waste treatment. The fast test will be performed after thirty days from
the effective date of this permit during the months of Zai 1, Ape, Tul, Oct
The parameter code for this test if using Daphnia pulex is TAA3D. The parameter code for this test if using
Ceriodaphnia is TAA3B. 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 appropriate
parameter code. Additionally,DEM Form AT-1 (original) is to be sent to the following address:
Attention: Environmental Sciences Branch
North Carolina Division of
Environmental Management
4401 Reedy Creek Road
Raleigh, N.C. 27607
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 any single quarterly monitoring indicate a failure to meet specified limits, then monthly monitoring will
begin immediately until such time that a single test is passed. Upon passing, this monthly test requirement will
revert to quarterly in the months specified above.
Should any test data from either these monitoring requirements or tests performed by the North Carolina Division
of Environmental Management indicate potential impacts to the receiving stream, this permit may be re-opened and
modified to include alternate monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control organism
survival and appropriate environmental controls, shall constitute an invalid test and will require immediate
retesting(within 30 days of initial monitoring event). Failure to submit suitable test results will constitute
noncompliance with monitoring requirements.
7Q10 /c]bn cfs
Permitted Flow 1.6 MGD Recommended by:
iwC 6.75� %
Basin & Sub-basin 676 All
Receiving Stream Vad lOr
County Date /3 �?5
QAL Daphnid 48 Version 10191

Facility Name�QO W ZUJK t &f)0 Permit# 7La Pipe
CHRONIC TOXICITY PASS/FAIL PERMIT LIMIT (QRTRLY)
The effluent discharge shall at no time exhibit chronic toxicity using test procedures outlined in:
1.) The North Carolina Ceriodaphnia chronic effluent bioassay procedure(North Carolina Chronic Bioassay
Procedure-Revised *September 1989) or subsequent versions.
The effluent concentration at which there may be no observable inhibition of reproduction or significant mortality
is.L5_56 (defined as treatment two in the North Carolina procedure document). The permit holder shall perform
quarterly monitoring using this procedure to establish compliance with the permit condition. The first test will be
performed after thirty days from the effective date of this permit during the months of
la m r.4 n i,li �r4- Effluent sampling for this testing 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,DEM Form AT-1 (original) is to be sent to the following address:
Attention: Environmental Sciences Branch
North Carolina Division of
Environmental Management
4401 Reedy Creek Road
Raleigh, N.C. 27607
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/msponse 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 any single quarterly monitoring indicate a failure to meet specified limits,then monthly monitoring will
begin immediately until such time that a single test is passed. Upon passing,this monthly test requirement will
revert to quarterly in the months specified above.
Should any test data from this monitoring requirement or tests performed by the North Carolina Division of
Environmental Management indicate potential impacts to the receiving stream,this permit may be re-opened and
modified to include alternate monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control organism
survival and appropriate environmental controls, shall constitute an invalid test and will require immediate
retesting(within 30 days of initial monitoring event). Failure to submit suitable test results will constitute
noncompliance with monitoring requirements.
7Q10 /'910 cfs
Permitted Flow a, e) MGD Recornmended by:
IWC 1. 5 %
Basin & Sub basin U 0 I
Receiving Stream 2 3 S
County Date
QCL P/F Versfon 9191

Tkl� S,dr sluOpp win rtpur# ?30Z
TOXICANT ANALYSIS
Facility Name North Wilkesboro
NPDES# NC0020761
Ow MGD 2
7010s cis 1 ...
IwC % 1.56
Reclying Stream Yadkin River
Stream Class C
.............................._.._._.._.._.._.._.._.._.._.._.._.._.._.._
FINAL RESULTS
Cadmium
Max. Pred Cw 15.08073761
Allowable Cw 128.5
Chromium
Max. Pred Cw 70.2787963
Allowable Cw 3211.3
Nickel
Max. Pred Cw 35.39929613
Allowable Cw 5651.9
Cyanide
Max. Pred Cw 25.80821309
Allowable Cw 321.1
Copper
Max. Pred Cw 102.6554763
Allowable Cw 449.6
Zinc
Max. Pred Cw 359.771098
Allowable Cw 3211.3
Lead
Max. Pred Cw 12.70835979
Allowable Cw 1605.6
Arsenic
Max. Pred Cw #DIV/0!
Allowable Cw, 3211.3
Silver
Max. Pred Cw 7.462432631
Allowable Cw 3.9
Mercury
Max. Pred Cw 0.1
Allowable Cw 0.8
0
Max. Pred Cw #DIV/0!
Allowable Cw 0.0
6/8195 PAGE '

Summary
North Wilkesboro WWTP
Toap� 5 /`i95-
(copied from memo by kichelle Wilson 1220/94)
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 coliforn-L 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 3576/100ml 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. 1200 (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 (written by Michelle Wilson 12/20/94)
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 coliform concentrations as high as 400,000/100m1 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.
Additional Information (written by Andy McDaniel 6/5/95)
The City of North Wilkesboro currently has a permit to discharge 1.0 MGD into the Yadkin
River. The City plans to expand the plant to 2.0 MGD as well as add
chlorination/dechlorination chambers. Due to the lack of disinfection facilities the plant has
been consistently out of compliance with its fecal colifotm limit. Currently, the plant is
operating under an SOC for increased flow and no fecal coliform limit until the expansion
is complete (3/30/98,ref. May 24, 1995 staff report).

®k7A R«< J
LONG TERM MONITORING PLA REQUEST FORM [ S 11 als4'(/w�+_•A'
Fuji�I 7)Z) R7'7� i
FACILITY:
NPDES NO.: NC po "Zo7(, (
EXPIRATION DATE:
REGION: W
P&E REOUESTOR -6
PRETREATMENT CONTACT:
DATE: (oF
INDICATE THE STATUS OF PRETREATMENT PROGRAM:
1) THE FACILITY HAS NO SIU'S AND SHOULD NOT HAVE PRETREATMENT LANGUAGE.
2) THE FACILITY HAS OR IS DEVELOPING A PREATREATMENT PROGRAM.
3) ADDITIONAL CONDITIONS REGARDING THE PRETREATMENT PROGRAM ATTACHED.
PERMITTED FLOW:
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SOC PRIORITY PROJECT: YesZNO_
If Yes, SOC No. qy-2 ,r
cc : Permits and Engineering
Technical Support Branch
County Health Dept .
Central Files
WSRO
To: Permits and Engineering Unit
Water Quality Section
Attention: Susan Wilson
Date May 24 , 1995
NPDES STAFF REPORT AND RECOMMENDATION
County Wilkes
Permit No. NC0020761
PART I - GENERAL INFORMATION
1 . Facility and Address : Town of North Wilkesboro
601 Main Street
North Wilkesboro, NC 28659
2 . Date of Investigation: May 23 , 1995
3 . Report Prepared by: George Smith
4 . Persons Contacted and Telephone Number: Mr. Jeff Carty
910-838-5001
5 . Directions to Site : From W-S follow Hwy 421 West to
North Wilkesboro, Hwy 115 exit . Turn right and go
approximately 3 miles to the bridge over the Yadkin
River, and turn left on Hwy 18-268 (West) and go approx
0 . 2 miles . Turn left on Chestnut Street and go past Smoot
Park to the WWTP which is located Thurman Street .
6 . Discharge Point (s) , List for all discharge points :
Latitude : 360 09' 44 " Longitude : 810 08 ' 02"
Attach a USGS map extract and indicate treatment
facility site and discharge point on map.
U. S.G. S . Quad No. C14NW U. S .G.S . Quad Name Wilkesboro

7 . Site size and expansion area consistent with
application ?
X Yes No If No, explain:
8 . Topography (relationship to flood plain included) :
The WWTP is immediately adjacent to the Yadkin River.
The facility is has not been affected by any flooding.
9 . Location of nearest dwelling:
There are several buildings and a recreational park
within 1500 feet .
10 . Receiving stream or affected surface waters :
Yadkin River
a. Classification: Class C
b. River Basin and Subbasin No. : Yadkin Pee Dee
03-07-01
C . Describe receiving stream features and pertinent
downstream uses :
Fishing, wildlife, recreation, and agriculture .
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1 . a . Volume of Wastewater to be permitted: 2 . 0 MGD
(Ultimate Design Capacity)
b. What is the current permitted capacity of the
Waste Water Treatment facility? 1 . 0 MGD
C . Actual treatment capacity of the current facility
(current design capacity) ? 1 . 0 MGD
d. Date (s) and construction activities allowed by
previous Authorizations to Construct issued in the
previous two years : N/A
e . Please provide a description of existing or
substantially constructed wastewater treatment
facilities : Mechanical bar screen, grit chamber,
influent lift station, dual primary clarifiers, #1
aeration basin with floating aerators, dual
secondary clarifiers, unheated anerobic digestor
and drying beds . The #2 aeration basin is being
used as an aerobic digestor with ultimate, land
application.

f . Please provide a description of proposed
wastewater treatment facilities :
Mechanical bar screen, grit chamber, influent lift
station, Three primary clarifiers, Two 1 . 0 MGD
aeration basins with floating aerators, Four
secondary clarifiers, Two aerobic digestors and
drying beds, Sludge thickner, Sludge storage tank
with floating aerator, Chlorination and
Dechlorination units.
g. Possible toxic impacts to surface waters :
Currently they are able to meet Acute toxicity at
78% dilution. The plant expansion to a 2 . 0 MGD
will change their toxicity limit to Chronic
toxicity. Passing Chronic toxicity has not been
demonstrated.
h. Pretreatment Program (POTWs only) :
in development _ approved X
should be required not needed
2 . Residuals handling and utilization/disposal
scheme : Land application
a. If residuals are being land applied, please
specify DEM permit no.WO0002040
Residuals Contractor Environmental Waste Recycling
Telephone No. 910-998-8481
b. Residuals stabilization: PSRP X PFRP
Other—
C. Landfill : N/A
d. Other disposal/utilization scheme (Specify) : NONE
3 . Treatment plant classification (attach completed rating
sheet) : Class IV
NPDES Permit Staff Report
Version 10/92
Page 3

4 . SIC Code (s) : 4952
Wastewater Code (s) of actual wastewater, not particular
facilities i .e . . , non-contact cooling water discharge
from a metal plating company would be 14 , not 56 .
Primary 01 Secondary 64
Main Treatment Unit Code : 0 4 0 3
PART III - OTHER PERTINENT INFORMATION
1 . Is this facility being constructed with Construction
Grant Funds or are any public monies involved.
(municipals only) ? Yes, State Bond Funding.
2 . Special monitoring or limitations (including toxicity)
requests : The WWTP has not demostrated that they can
pass the Chronic toxicity after expansion .
3 . Important SOC Compliance Schedule dates :
(Please indicate)
Date
Submission of Plans and Specifications April 30 , 1995
Begin Construction March 30 , 1996
Complete Construction March 30 , 1998
4 . Alternative Analysis Evaluation: Has the facility
evaluated all of the non-discharge options available .
Please provide regional perspective for each option
evaluated.
Spray Irrigation: N/A
Connection to Regional Sewer System: N/A
Subsurface : N/A
Other disposal options : NONE
5 . Other Special Items : NONE
NPDES Permit Staff Report
Version 10/92
Page 4

PART IV - EVALUATION AND RECOMMENDATIONS
We recommend this NPDES permit modification be approved pending
the following remarks :
1) The present drawings show the skimmings from the secondary
clarifiers can be diverted to the primary clarifiers . This
office ,feels the skimmings should be sent directly to the
digestors only!
t -
George ith Date
Steve Mauney Date
Water Quality Supervisor
NPDES Permit Staff Report
Version 10/92
Page 5

State of North Carolina
Department of Environment,
Health and Natural Resources • sSai►1
Division of Environmental Management James B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary ® FEE FIt Q,
A. Preston Howard, Jr., P.E., Director
April 12, 1995
Certified Mail
Retum Receipt Requested T y
n ,
v`
ter_
r ;
Mr. Samuel W. Misenheimer, Town Manager
Town of North Wilkesboro
P.O. Box 218
North Wilkesboro, North Carolina 28659
SUBJECT: Return of Authorization to Construct Fee
Thurman Street WWfP
NPDES No. NCO020761
State Bond Project
Dear Mr. Misenheimer:
Enclosed is the Town of North Wilkesboro's check No. 019567 in the amount of$200.00
for the subject project. The review of a project for an Authorization to Construct cannot begin
until an application for a new NPDES permit has been received. The earliest that the Water
Quality Section will accept an NPDES permit application is after the FONSI goes to
Clearinghouse for review. For this project; this is tentatively scheduled for May 5, 1995. It will
take approximately six (6) months from the submittal of a complete application before the permit
can be issued.
The Construction Grants and Loans Section will be performing the review for this project
including the drafting of the Authorization to Construct.You will be advised during the review
process as to the appropriate time to resubmit the fee.
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

PAGE 2
If you have any question, please do not hesitate to contact Mr. Bennie Goetze, Jr, the
Project Review Engineer, at [phone] ext. 625.
Sincerely:
William S. Hoffman
Supervisor
Design Management Unit
BGA
cc: Finkbeiner. Pettis & Strout
Winston Salem Regional Office
C. olleen-Sullms
DMU
SBF

State of North Carolina
Department of Environment,
Health and Natural Resources `` •
Division of Environmental Management r
James B. Hunt, Jr., Governor +2�
Jonathan B. Howes, Secretary p E H N Ri
A. Preston Howard, Jr., P-E., Director
April 7, 1995
Mr. Sam Misenheimer, Town Manager
Town of North Wilkesboro
801 Main Street
North Wilkesboro, North Carolina 28659
Subject: Plans & Specifications Return
North Wilkesboro Expansion
NPDES Permit NCO020761
Wilkes County
Dear Mr, Misenheimer.
The Environment Assessment for the Town of North Wilkesboro has not been completed
and the Department has not yet issued a Finding of No Significant Impact. For this reason, no
permit application or plans for expansion have yet been accepted by the Division.
The $200.00 check and plans and specification package are being returned with this letter.
The Town should contact Bennie Goetze, Construction Grants &Loans Section (919) 733 - 6900
Ext. 625, in regard to the schedule for submittal of expansion plans.
If you have any questions regarding submittal of the NPDES application package, please
contact Susan Wilson at(919) 733-5083 Ext. 555.
Sincerely,
Preston Howard, Jr., P.E.
cc: Winston-Salem Regional Office
Bennie Goetze, CG&L
Steve Moran, FPS
Central Files
Permit File
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

DIVISION OF ENVIRONMENTAL MANAGEMENT
April 6, 1995
Memorandum
To: Monica Sw art
Through: Don Sa rit
Ruth Swanek'�_LS
Carla Sanderson
� w
From: Susan'=A=Wilson
fZZ7.._
U
Subject: North Wilkesboro WWTP Expansion -- � ZZ
Response to Further Comments on 201 Plan
Revised 201 Facilities Plan/ Project No. 697 22
NC0020761
, c
Wilkes County _✓
The Technical Support Branch (TSB) has reviewed the comments submitted April 4 and 6,
1995 by FP&S for the proposed North Wilkesboro Wastewater Treatment Plant expansion
(1 MGD to 2 MGD).
The information submitted by the Town and its consultants adequately addresses the three
main concerns that TSB had regarding the expansion.
The Technical Support Branch has no further comments on the project.
cc: Steve Mauney, WSRO
Central Files

WS REGIONRL OFFICE Fax [phone] Apr 6 '95 7:35 P. 02/02
State rt Carolina
Department
of Environment, �
Health and Natural Resources —
Winston-Salem Regional Office
James B. Hunt,Jr„ Governor
Jonathan S. Howes,Socrotary bIV15IofiZ3F 1 AAN GIIviFNT
Leesha Fuller, Reglonal'Manoger
— Water Quality Section —
Aprtl 6, 1995
MEMORANDUM
TO: Ms. Melba McGee
n,�I'1t� Construction Grants and Loan Section
FROM: tta7 \Beth Mortonl`�v- Environmental Engineer
SLMIWT: Town of North Wilkesboro Wastewater Treatment Plant (WWTP)Expansion
201 Pjahties Plan Amendment
.State Bond Program. .
Comments from Finkbeiner. Pettis & Strout, Inc. Consulting Fmgiaeers have been received which addre&wd my
concerns stated in my memorandum of Iattttary 30, 1995. My cowems have been resolved. The Winston-Salem
RcgimW office has no further concerns or comments on the project- We approve of stated the expansion plans.
cc: WSRO file
Central Fuze
585 Woughtown Shoat,WlnstonSalom North Carolna 27107-2241 Taleplwne 910-771-d600 FAX [phone]
An Equal opportunity AMTroattve Action Employer 60%recycled]io%post-consumer paper

Page 1
Note for Susan Wilson
From: Coleen Sullins
Date: Thu, Apr 6, 1995 7:23 AM
Subject: RE: n. wilkesboro-again
To: Susan Wilson
I would say they need to make contact with Wilkesboro requesting whether they have the
ability to serve N. Wilkesboro and if so at what cost. Once they get that documented, they
._.—
can resubmit. azn not sure why they want the meeting, t reYieve them from the
requtrement to contact Wilkesboro? What are the othe o rssues? We certainly can meet
wrth them, if they would like- aze there really an stantr -issues other than the
connection? Coleen
From: Susan Wilson on Wed, Apr 5, 1995 11:17 AM.
Subject: n. wilkesboro-again
To: Coleen Sullins
i spoke with monica about this today. she said the consultant told her that i had verbally
agreed with the responses he had to our comments, but she told him he would have to go
through the normal channels. i had in no way agreed with his responses (i only agreed with
2 of the 3 responses-the sticking point being the connection to wilkesboro, as he well knew).
he just faxed me the same bs they put in the 201. I'm going to call him and request that he
send me a letter from the town of wilkesboro stating that they would not take n. wilkesboro
and the timing is not right for their expansion,etc.
but monica also said that wilkesboro's consultant has called wanting a meeting re. their
expansion. she really wants to push this issue (i think she left a message for you about it),
but i m not sure how much we can push. especially since we aze the ones pushing the issue
and we'd be the ones catching crap from all sides for holding up what cg&1 thinks is a done
deal. what do you think?
i

FINKBEINER, PETTIS & STROUT, INC.
April 4, 1995
Ms. Susan A. Wilson
The State of North Carolina
CONSULTING ENGINEERS Department of Environment,
ESTABLISHED 1900 Health & Natural Resources
FIRST CAMPBELL SQUARE Division of Environmental Management
230 FIRST S'PREET Technical Support Branch
ROANOKE,VIRGINIA 24011 P.O. Box 29535 t{J
703-343J513 Raleigh, NC 27626-0535 Q-1
703-343-7947 FAX
Re: Town of North Wilkesboro 'w
Thurman Street WWTP Plant v
Expansion - Revised 201
Facilities Plan Project r?-
Number 697 1 t�
Dear Ms . Wilson:
F? We are in receipt of your memorandum to Monica Swihart
dated February 28, 1995 . This memorandum listed three comments
to the revised 201 Plan for the wastewater treatment plant
expansion from 1 .0 MCD to 2.0 MGD. The following responses are
offered to your comments .
1 . In the initial discussions with the Technical Support
Branch it was stated that the combining of North
Wilkesboro and Wilkesboro treatment facilities into
a regional facility at Wilkesboro be investigated.
In the 201 facilities planning report Section IV
(attached) , FPS performed an economic analysis of
combining the plants versus the proposed Thurman
Street plant expansion. It appears, based on our
analysis, that it would not be in the best interest
of the Town of North Wilkesboro to pursue this matter
because of the higher cost associated with the
regionalization option. Also our discussions with
Wilkesboro indicated they had no plans to upgrade
their wastewater treatment plant in the foreseeable
future. Further, regionalization was explored during
the original 201 Facilities Plan in 1975 and this
option was eliminated by the actions of the Town of
Wilkesboro (see attached 201 Facilities Plan update
Section IV) . Therefore, the Town of North Wilkesboro
does not wish to enter into a regional facility at
this time. It appears to be in the best interest of
the Town of North Wilkesboro to continue to operate
its wastewater treatment plant as a stand alone
facility and upgrade it to a 2.0 MGD facility.

Ms. Susan A. Wilson
April 4, 1995
Page Two
2. The Town has requested a notice of intent from -
Carolina Mirror. However, this notice of intent has
not been received to date.
3. Finkbeiner, Pettis S Strout, Inc. has recently
completed design of a 6,700 plus linear feet sewer
line extension to bring additional flow to the
Mulberry Creek WWTP. This line extension will serve
a section of Wilkes County that is mostly residential
and a proposed 54 acre industrial park. The Town has
stated that the industries it is seeking to locate at
the proposed industrial park would be low water users
that would discharge domestic waste from bathrooms
and other areas for employees. In the event that
industrial waste is produced at the proposed site,
all pretreatment ordinance regulations currently
established by the Town must be met.
It is our understanding from the documentation
received from the Winston-Salem Office of the
Division of Environmental Management that the plant
is currently meeting the discharge limits of its
NPDES permit. In discussion with the plant supplier,
it was stated that when more flow comes to the
facility it would operate more efficiently and
produce better quality effluent . Finally, an
analysis was performed to study the potential of
abandoning the plant and pumping the waste to the
Thurman Street Wastewater Treatment Plant. Our
analysis indicates that it was not feasible or in the
best interest of the Town of North Wilkesboro to
abandon the plant and pump to Thurman Street A copy
with this analysis is attached. Discussions with the
Town have indicated its desire to keep the plant
operational in its current location.
It is hoped that the information provided will be
sufficient to address these comments and allow your office to
produce a memorandum to Ms. Swihart stating that the Technical
Support Branch concurs with the revised 201 Facilities Plan.
Stet the compressed timeframes involved with funding for the
facility, it is asked that this memorandum be written so that it
may be in the hands of Mr. Cecil Madden in Raleigh by April 7,
1995.

Ms. Susan A. Wilson
April 4, 1995
Page Three
Thank you for your efforts on behalf of the Town of North
Wilkesboro and its efforts to upgrade its wastewater treatment
plant.
Sincerely,
Ronald B. Smith, P.E.
RBS/wp
Enclosures

Therefore, 20 sites must be developed and will require 60 miles of 16-inch force
main.
y� The cost estimate for land application of effluent, in addition to the cost
of treatment, is estimated at more than $55,000,000. Calculations for sizing the
g .. system and the cost estimate are shown in Exhibit G.
n 5. ALTERNATIVE 5: REGIONAL TREATMENT
a. General �^
J
P ^i
Regional collection of wastewater would serve to replace several discharges i „o• n
J K �T—
into a single larger discharge. The benefit of this approach is to pool the
collective resources at one facility to avoid duplicated effort. The savings in
resources, personnel, and equipment could then be directed to other efforts . CD
There are three wastewater discharges in the area. North Wilkesboro operates two
wastewater treatment plants and Wilkesboro operates one.
A regional approach can be developed on two levels. First, discharges in
North Wilkesboro could be combined by the elimination of the Mulberry Creek
wastewater treatment plant, and secondly the wastewater from both Towns could
be combined and treated by a single plant.
1 b. Combine North Wilkesboro's WWTP's
The elimination of the Mulberry Creek treatment plant could be achieved by
either pumping its flow approximately 11,000 feet to a gravity sewer near the
intersection of Flint Hill Road and NC 268, or pumping a distance of
-� approximately 7,000 feet to Pumping Station Number 1.
The capacity of the Mulberry Creek treatment plant is 80,000 gpd which will
_ result in a peak flow of approximately 200,000 gpd. This is a rate of about 140
gpm. The minimum size forcemain that should be considered is a four inch which
requires a rate of 80 gpm to have a minimum required velocity of 2 fps . Using a
six inch forcemain requires a rate of 180 gpm to have a minimum required velocity
of 2 fps which is greater than required for the Mulberry Creek wastewater flow.
Therefore a 4-inch forcemain and a pump capacity of 140 gpm would be selected.
The calculation of the head loss, as shown in Exhibit H, for either
forcemain length results in a required total dynamic head that is higher than can
IV - 11

be provided by a solids handling sewage pump. There are other factors that are
not favorable for this option. Because of the low influent flow rate to the
9
proposed pumping station the detention time in the forcemain will be
approximately 22 hours. This likely would result in odor problems at the
forcemain discharge. Also, the capacity of the existing pumping stations,
forcemain, and gravity sewers that would receive this flow must be increased to
handle the added flow.
' Eliminating the Mulberry Creek wastewater treatment plant by pumping its
flow to the Thurman Street wastewater plant's collection system is not feasible.
J
C. Combine North Wilkesboro and Wilkesboro WWTP's
'L
Combining the flow from the two towns of North Wilkesboro and Wilkesboro
t is a second approach to regional treatment. This could be accomplished by
treatment of the combined flow at one of the existing treatment plant sites or
developing a new plant site. The latter option was evaluated in the original 201
Facilities Plan for North Wilkesboro, Wilkesboro, and Wilkes County in 1975 . At
that time Wilkesboro elected to expand its own plant with local funds rendering
that option not feasible for North Wilkesboro and Wilkes County to participate
Using the preliminary data from the original 201 Facilities Plan, as shown in
Figure 8 - Proposed Regional Wastewater System, the cost for this option has been
updated as presented in Exhibit H and summarized in Table 8 - Regional Wastewater
-� System.
Table 8
Regional Wastewater System
1994 Cost
Yadkin River Outfall $ 2,950,000
Cub Creek Outfall 392,000
Mulberry Creek Outfall 655,000
10 MGD Wastewater Treatment Plant 22,000,000
Total Construction Cost $ 25,997,000
Technical services, contingencies 9.003,000
Total Project Cost $ 35,000,000
If this project were implemented, the costs to be allocated among the
beneficiary parties would have to be negotiated. North Wilkesboro's share can
IV - 12

.-� be assumed to be equal to its share of the new regional plant capacity, or 20X.
This results in a cost to North Wilkesboro of $7,000,000.
3 Because of the high cost of this alternative the development of a regional
M-
plant at one of the existing wastewater treatment plants should be considered.
The current flows at the Wilkesboro wastewater treatment plant are approximately
R 3 MGD and an additional 1 .64 MGD of flow, as shown in Exhibit H, can be expected
from service to the water associations . By adding North Wilkesboro's projected
flow of 2 MGD, the proposed regional plant should have a minimum capacity of 7.0
MGD. North Wilkesboro's treatment plant site can be developed to a capacity of
4.0 MGD. Portions of the existing Town park must be used for expanding beyond
this capacity. Since site limitations restrict North Wilkesboro's capacity, a
regional facility would have to be located at the Wilkesboro plant site.
The existing capacity of Wilkesboro's wastewater treatment plant is 4.9
MGD. Therefore, as a minimum the plant capacity would have to be increased by 2.1
MGD. This is approximately the amount of capacity that is required by North
Wilkesboro and, therefore, the cost of this amount of expansion would be the
responsibility of North Wilkesboro. Although a detailed plan has not been
developed for expanding Wilkesboro's plant it can be assumed that the cost will
r,�,
.IM be no less than the cost for expanding North Wilkesboro's plant by 1 MGD and
would likely be higher. North Wilkesboro also would be required to construct
-
� and operate a pumping station and forcemain to convey its flow to Wilkesboro's
plant site. The existing raw wastewater pumping station could be used by
replacing the existing pump impellers and motors. The cost of this forcemain and
pumping station modification is estimated, as shown in Exhibit H, at $680,000.
+ C. SELECTED PLAN
To maintain effective treatment at the existing 1 .0 MGD rated capacity
North Wilkesboro WWTP, numerous improvements must be made. These improvements
ltotal $1,680,000 in 1994 dollars and are itemized in Exhibit D. Treatment of only
1 .0 MGD capacity will not satisfy the treatment needs of the area, therefore,
additional capacity is required.
Treatment capacity at the North Wilkesboro WWTP can be increased to 2.0 MCD
by performing all the 1 .0 MGD improvements plus constructing either conventional
treatment improvements or improvements associated with the Sequencing Batch
Reactor. Because of operator familiarity with the conventional treatment process
now used, and due to the higher SBR option cost, it is recommended that the WWTP
IV - 13

expand using conventional processes. Costs for conventional and SBR treatment
improvements total $4,170,000 and $4,280,000 in 1994 dollars, respectively. The
conventional treatment improvements are itemized in Exhibit E. Sludge digestion
:vy+
could be achieved by either aerobic or anaerobic digestion which would produce
a Class B sludge, or a Class A sludge could be produced by autothermal
thermophilic aerobic digestion. Because of operator familiarity with the aerobic
digestion process now used, and due to the higher cost of the other options, it
is recommended that the WWTP use the aerobic digestion process as previously
_ described. Costs for aerobic, anaerobic, and autothermal thermophilic aerobic
digestion total $1,555,000, $2,032,000 and $2,835,000 in 1994 dollars,
respectively. The costs for the sludge treatment alternatives are itemized in
Exhibit F.
LL As an alternative to expanding the Thurman Street WWTP treatment could be
7Y provided for the entire region by a single facility. Options for regional
Y
treatment include a new wastewater treatment plant built at the confluence of the
Yadkin River and Mulberry Creek. This facility would be able to treat flow from
both Wilkesboro and North Wilkesboro and a large area of Wilkes County
surrounding the two Towns . This would require the construction of outfalls along
the Yadkin River, Mulberry Creek, and Cub Creek to collect flow from the three
existing wastewater treatment plants. The cost of a project of this magnitude is
C-1 estimated at over $35,000,000 as shown in Exhibit H. A regional approach on a
smaller scale is available if flow from North Wilkesboro is pumped to
Wilkesboro's wastewater treatment plant. A plant expansion of 2.0 MGD would be
required at Wilkesboro's treatment plant which would cost at least as much as the
r 7 1 .0 MGD expansion of North Wilkesboro's treatment plant, plus the cost of raw
LJI wastewater pumping station modifications at the existing North Wilkesboro
treatment plant and a forcemain to Wilkesboro. These costs are estimated at
$6,750,000 for a plant expansion and $680,000 for the pumping station and
forcemain. The calculation of these estimates are shown in Exhibit H.
The selected plan is to expand North Wilkesboro's Thurman Street wastewater
treatment plant to 2.0 MGD and to continue to operate its Mulberry Creek
Wastewater treatment plant. The expanded plant will employ a conventional
treatment process and will use aerobic sludge digestion to produce a Class B
t 7 sludge which can be land applied. A design data summary for the improvements is
presented in Exhibit I .
IV - 14

State of North Carolina
Department of Environment,
Health and Natural Resources 4 • •
Division of Environmental Management Q!'
James B. Hunt, Jr., Governor p
Jonathan B. Howes, Secretary ® � --� f1
A. Preston Howard, Jr., P.E., Director
March 10, 1995
f�
X
Mr. Samuel W. IMfisenheimer, Town Manager
Town of North Wilkesboro
P. O. Box 218
North Wilkesboro, North Carolina 28659
SUBJECT: Town of North Wilkesboro
Wastewater Treatment Facilities
In-Progress Plan Review
Conference
Dear Mr. Mlsenheimer:
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. _ c
The 10% In-Progress Plan review conference should be held in April 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 501/o 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/infonmtion 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 overruns, 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/Constructibility 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. Lary
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 JOGSOC 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. Hoffinan, 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-eolleen`Sullin—s----:::2
Mr D'Donald-Safrit
Ms. Ruth Swanek
Mr. Bennie Goetze, Jr.
DMU
SBF

DIVISION OF ENVIRONMENTAL MANAGEMENT
February_28, 1995
Memorandum
To: Monica S 'hart
Through: Don S t �
Ruth S c 4A S
Carla Sanderson
_ r
From: Susan-A—Wilson- J
c�-
Subject: North Wilkesboro WWTP Expansion
Revised 201 Facilities Plan/Project No. 697
NC0020761
Wilkes County
The Technical Support Branch (TSB) has reviewed the revised201 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"at the Town of
Wilkesboro's wastewater treatment plant should be 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 he 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,W SRO Central Files