NC0039578_SPECULATIVE LIMITS_20060301

NPDES DOCYNENT SCANNIM& COVER SNEET
NPDES Permit:
NC0039578
TWSA WWTP #1
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Speculative Limits
Instream Assessment (67b)
Environmental Assessment (EA)
Permit
History
Document Date:
March 1, 2006
This document IM priatea on reuBe paper - igPzore aay
content on the rem erase wiae
•
A

Michael F. Easley, Governor
State of North Carolina
William G. Ross, Jr., Secretary
Department of Environment and Natural Resources
Alan W. Klimek, P.E., Director
Division of Water Quality
March 1, 2006
Mr. Stan Bryson
Wastewater Operations Superintendent
Tuckaseigee Water and Sewer Authority
1246 West Main Street
Sylva, North Carolina 28779
Subject: Speculative Effluent Limits
TWSA Plant #1
NPDES Permit 4NCO039578
Jackson County
Dear Mr. Bryson:
This letter is in response to your request for speculative effluent limits for proposed expansions from
1.5 MGD to 3MGD, 3.5 MGD, and 4 MGD at Plant # 1.
Receiving Stream. This facility discharges to the Tuckasegee River in the Little Tennessee River
Basin. The best usage of these waters is aquatic life propagation and maintenance of biological
integrity (including fishing and fish), wildlife, secondary recreation, and agriculture. In addition,
this classification is intended to protect freshwaters for natural trout propagation and survival of
stocked trout. The 2002 Little Tennessee Basin Plan lists this waterbody as having excellent water
quality and notes no restrictions to discharge in this segment.
As mentioned in the July 2002 speculative effluent limits, the flow estimates used for the Tuckasegee
River are lower than the flows on which your current permit limits are based. Table 1 summarizes
this data. You may wish to contact Mr. Curtis Weaver with the USGS at [phone] to obtain a
new flow estimate.
Table 1: Comparison of Previouslv Used Streamflow Data Versus New Estimates
Previously Used Data
Current Estimate'
Drainage Area (miz)
286
286
Summer 7Q10 (cfs)
165
149.6
Winter 7Q10 (cfs)
199
184.1
Average Flow (cfs)
715
635
30Q2 (cfs)
297
273.9
IWC (%) at 1.5 MGD
1.4
1.53
1) Limits based on streamflows calculated based on regional equations listed in the USGS document Lou, Floro Characteristics of
Streams in North Carolina.
Speculative Limits. Based on available information, speculative effluent limits for the proposed
discharges of 3 MGD, 3.5 MGD and 4 MGD are presented in Table 2. A complete evaluation of these
limits and monitoring frequencies in addition to monitoring requirements for metals and other
toxicants will be addressed upon receipt of a formal NPDES permit modification request.
1617 Mail Service Center, Raleigh, North Carolina 27699-1617 Telephone [phone] FAX [phone]nrolina
512 N. Salisbury Street, Raleigh, North Carolina 27604 On the Internet at http://h2o,enr.state.nc.us/ onth
An Equal OpportunitylAffirmative Action Employer 'ntCarolm

TABLE 2 SDeculative Limits for TWSA Plant #1 NCO039578
l�lgl���VI
'T, Effluent Limitations at i�i
'i�Efflue11 nt Limitations atl'i
"li Effluent Limtahonsat[
-,Effluent � `
LV
`.'•�-�'3.0 MGD;,;-
.r 33.5MGD' �4
'i :4.0MGD
Monthly
Weekly
Daily
Monthly
Weekly
Daily
Monthly
Weekly
Daily
l Yly 6�CJ F I II
Avg
Avg
Max
Avg
Avg
Max
Avg
Avg
Max
Flow (MGD)
3.0
3.5
4.0
30.0
45.0
30.0
45.0
30.0
45.0
Sum
Summerm /L)
TSS (mg/L)
30.0
45.0
30.0
45.0
30.0
45.0
NH3 as N
26.0
35.0
22.4
35
20
35
Summer (m /L)
NH3 as N
Winter m /L
TRC(pg/L)
28
28
28
Fecal coliform
(#/100 mL
200
400
200
400
200
400
geometric mean)
Engineering Alternatives Analysis (EAA). Please note that the Division cannot guarantee that an
NPDES permit modification for any expansion will be issued with these speculative limits. Final
decisions can only be made after the Division receives and evaluates a formal permit application for
TWSA's proposed discharge. In accordance with the North Carolina General Statutes, the
practicable wastewater treatment and disposal alternative with the least adverse impact on the
environment is required to be implemented. Therefore, as a component of all NPDES permit
applications for new or expanding flow, a detailed engineering alternatives analysis (EAA) must be
prepared. The EAA must justify requested flows, and provide an analysis of potential wastewater
treatment alternatives. Alternatives to a surface water discharge, such as spray/drip irrigation,
wastewater reuse, or inflow/infiltration reduction, are considered to be environmentally preferable.
A copy of the EAA requirements is attached to this letter. Permit applications for new or
expanding flow will be returned as incomplete if all EAA requirements are not adequately
addressed. If you have any questions regarding these requirements, please contact the DWQ
NPDES Unit at 919-733-5083. You may also refer to the unit's website at
http://www.ncwaterquality.org/NPDES.
State Environmental Policy Act (SEPA) EA/EIS Requirements. A SEPA EA/EIS document must be
prepared for all projects that 1) need a permit; 2) use public money or affect public lands; and 3)
might have a potential to significantly impact the environment. For new wastewater discharges,
significant impact is defined as a proposed discharge of >500,000 gpd and producing an instream
waste concentration of > 33% based on summer 7Q10 flow conditions. For existing discharges,
significant impact is defined as an expansion of > 500,000 gpd additional flow. Since your existing
facility is proposing an expansion of >500,000 gpd additional flow, you must prepare a SEPA
document that evaluat6 the potential for impacting the quality of the environment. The NPDES
Unit will not accept an NPDES permit application for the proposed expansion until the Division
has approved the SEPA document and sent a Finding of No Significant Impact (FONSI) to the
State Clearinghouse for review and comment. A SEPA Environmental Assessment (EA) should
contain a clear justification for the proposed project. If the SEPA EA demonstrates that the project
may result in a significant adverse effect on the quality of the environment, you must then prepare a
SERA HIS (Environmental Impact Statement). Since your proposed expansion is subject to SEPA,
the EAA requirements discussed above will need to be folded into the SEPA document. The
SEPA process will be delayed if all EAA requirements are not adequately addressed. If you have
PA

any questions regarding SEPA EA/EIS requirements, please contact Alex Marks with the DWQ
Planning Branch at(919) 733-5083, ext. 555.
Should you have any questions about these speculative limits or NPDES permitting requirements,
please feel free to contact Toya Fields at [phone], extension 551.
Sincerely,
Li Susan A. Wilson, P.E.
Supervisor, Western NPDES Program
Attachment: EAA Guidance Document
cc: (without Attachment)
US Fish and Wildlife Service, Ecological Services, PO Box 33726, Raleigh, NC 27636-3726 Attn: Sara Myers
NC WRC, Inland Fisheries, 1721 Mail Service Center, Raleigh, NC, 27699-1721 Attn: Fred Harris
Asheville Regional Office
Central Files
NPDES Permit File

NCDENR/DWQ
FACT SHEET FOR SPECULATIVE LIMITS DEVELOPMENT
Tuckaseigee Water And Sewer Authority
NCO039578
Facility Information
(1.) FacilityName:
(2J Permitted Flow MGD)
TW_SA Plant #1
1.5
(6) County
Jackson
(3.) Facility Class
(4J Pretreatment Program
(5.) Permit Status
III
None
Existing(9)
(7) Regional Office
(8) USGS Topo Quad
USGS Quad Name
Asheville
F6SW
S Iva South
Stream Characteristics
(1.) Receiving Stream: _
Tuckasegee River
f
(7J Drainage Area (mi2):
1 286
(2.) Sub -basin:_
04-04-02
(8.) Summer 7Q10 (cfs)I
�(9.)
149.6
_
(3.) Stream Index Number:
I.(4J Stream Class1.ification
_
2-79- (35.5)
C T.r _
Winter 7Q10 (cfs):
(10.) 30Q2 (cfs)
184.1
273.9
(5.)303(d) Status:_
Not listed_
(11.) Average Flow (cfs):
635
(6.)305(b) Status:
_
N/a
E (12J 1WC %:
1.4
Summary
TWSA has requested speculative limits for Plant #1 at proposed flows of 3.5 MGD and 4.0 MGD,
and asks to confirm previously received limits at 3 MGD. Limits at 3.0 MGD were prepared by
Natalie Sierra in July' The only change from those speculative limits is the addition of
toxicity -based ammonia limits during the summer months.
doo
The >91model was prepared using updated streamflow data calculated from streamflows at
USGS station 35105000, Tuckasegee River at Dillsboro, and a mean annual runoff of 2.22.
Calculated flows were slightly lower than those used for the last WLA and current permit
limitations.
Model runs at all proposed flows were protective of the 6.0 mg/L DO standard with secondary
limits. Ammonia limits will be necessary at all proposed flows during the summer months to
protect against toxicity.
The 2002 Little Tennessee Basin plan notes excellent water quality in the Tuckasegee River and
lists no restrictions for NPDES dischargers.

Namc of Stream
Description
Curr. Class
Date
Prop. Class Basin
Stream Index #
Wilson Creek
From source to Cullowhee
C;Tr
07/01/73
Little
2-79-31-2
Creek
Tennessee
Wolf Creek
From source to proposed
C;HQW
08/03/92
Little
2-79-31-3-(1)
intake for Western
Tennessee
Carolina Univ. Water Supply
Wolf Creek
From proposed intake for
C
07/01/61
Little
2-79-31-3-(2)
Western Carolina
Tennessee
University Water Supply to
Cullowhee Creek
Cherry Gap Branch
From source to Cullowhee
C
07/01/61
Little
2-79-31-4
(Chevy Gap
Creek
Tennessee
Branch)
Tilley Creek
From source to Cullowhee
C;Tr
07/01/73
Little
2-79-31-5
Creek
Tennessee
Flat Branch
From source to Western
C;HQW
08/03/92
Little
2-79-31-5-1-(l)
Carolina University Water
Tennessee
Supply Intake
Flat Branch
From Western Carolina
C
07/01/61
Little
2-79-31-5-1-(2)
Univ. Water Supply Intake to
Tennessee
Tilley Creek
Pressley Creek
From source to Tilley Creek
C
07/01/61
Little
2-79-31-5-2
Tennessee
Parker Branch
From source to Pressley
C
07/01/61
Little
2-79-31-5-2-1
Creek
Tennessee
Bryson Branch
From source to Tilley Creek
C
07/01/61
Little
2-79-31-5-3
Tennessee
Long Branch
From source to Western
C;HQW
08/03/92
Little
2-79-31-6-(1)
Carolina University Water
Tennessee
Supply Intake
Long Branch
From Western Carolina
C
07/01/61
Little
2-79-31-6-(2)
Univ. Water Supply Intake to
Tennessee
Cullowhee Creek
Cane Creek
From source to Tuckasegee
C;Tr
07/01/73
Little
2-79-32
River
Tennessee
Ash Branch
From source to Tuckasegee
C
07/01/61
Little
2-79-33
River
Tennessee
Locust Creek
From source to Tuckasegee
C
07/01/61
Little
2-79-34
River
Tennessee
Mill Creek
From source to Tuckasegee
C
07/01/61
Little
2-79-35
River
Tennessee
Bumgarner Branch
From source to Mill Creek
C
07/01/61
Little
2-79-35-1
Tennessee
3 Tuckasegee River
From Savannah Creek to
C;Tr
04/01/71
Little
2-79-(35.5)
Dillsboro Dam
Tennessee
Savannah Creek
From source to Tuckasegee
C;Tr
07/01/61
Little
2-79-36
River
Tennessee
Shell Branch
From source to Savannah
C
07/01/61
Little
2-79-36-1
Creek
Tennessee
Page II of 41

3 a / S,s VVI6,6 410 � � � )
MODEL INPUTS FOR LEVEL B ANALYSIS
GENERAL INFORMATION
Facility Name: �FE
NPDES No.: rll O 3�
Type of Waste: ��p i7M
I✓i
Facility Status: N
Receiving Stream:
Stream Classification:
Subbasin:
a
County:
Regional Office: lit
&LLr
Topo Quad: (� f
FLOW INFORMATION
USGS N 0 S 00
eL
.n.
IYL
Date of Flow Estimates:
Drainage Area (mi2):
176
Summer 7Q10 (cfs):
Winter 7Q10 (cfs):
(�
Average Flow (cfs):
30Q2 (cfs):
IWC at Point of Discharge (%): ,
Cummulative fWC (%):
MEN
MODEL INPUT INFORMATION dn 0
LENGTH OF REACH (miles)
RJCREMENTAL LENGTH (miles)
,
WASTE CHARACTERISTICS
FLOW (MGD)
CBOD (mg/0
/a
NBOD(mg/0
it ,
i
D.O. (mg/1)
RUNOFF CHARACTERISTICS
7Q10 (cfs/m l)
--
QA (cfs/mil)
CBOD (mg/1)
NBOD (mg/0
D.O. (mg/0
TRIBUTARY CHARACTERISTICS
7Q70 (cfs)
QA (cfs)
CBOD (mg/0
NBOD (mg/0
D.O. (mg/1)
SLOPE (fpm)
,.(fiq -g /,
Name of facility

NC0039578
Facility: TWSA Plant #1
Discharge to: Tuckasegee River
Residual Chlorine
7Q10(CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (UG/L)
UPS BACKGROUND LEVEL (UG/L)
IWC (%)
Allowable Cone. (ug/1)
Fecal Limit
Ratio of 32.2 :1
149.6
3
4.65
17.0
3.01
563
200/100ml
For Minor domestic -type facilities:
Minimum of 2 mg/I (summer) NH3-N; 4 mg/1 (winter) NH3-N
Ammonia as NH3
(summer)
7010 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (MG/L)
UPS BACKGROUND LEVEL (MG/L)
IWC (%)
Allowable Concentration (mg/1)
Ammonia as NH3
(winter)
7010 (CFS)
DESIGN FLOW (MGD)
DESIGN FLOW (CFS)
STREAM STD (MG/L)
UPS BACKGROUND LEVEL (MG/L)
149.6
4.65
1.0
0.22
2s.o9
184.1
4.65
1.8
0.22
IWC (%) 2.46
Allowable Concentratiionn (mg/1) 64.35
Chlorine:
Residual chlorine must be capped at 28 ug/I to protect for acute toxicity effects

M
bv+t9_exe _� ""-
SUMMER
---------- MODEL
RESULTS----------
ischarger
:
TWSA PLANT #1.
ece.iv.ing-Stream--: TUCKASEGEE-RIUER---
----------------------------------------------------------
he End
D.O.
is 7.50
mg/l.
he End
CBOD
is 2.98
mg/1-
he End
NBOD
is 3.88
mg/l.
- -
-
-- -
I&A
WLA
DO Min
CBOD
NBOD
(mg/1)
------
Milepoint Reach
--------- --------
# (mg/1)
----
(mg/1)
----
egment
1
7.48
1.90 1
Reach
1
45.00
117.00
ress any key to continue.
WLA
DO Waste Flow
(mg/1) (mgd)

TWSA3_S.OUT
3.0 SUMMER
Seg #
Reach #
Seg Mi
D.O.
CBOD
NBOD
Flow
1
1
0.00
7.49
3.30
4.50
154.25
1
1
0.10
7.49
3.29
4.48
154.25
1
1
0.20
7.49
3.28
4.47
154.25
1
1
0.30
7.48
3.28
4.46
154.25
1
1
0.40
7.48
3.27
4.44
154.25
1
1
0.50
7.48
3.26
4.43
154.25
1
1
0.60
7.48
3.26
4.42
154.25
1
1
0.70
7.48
3.25
4.40
154.25
1
1
0.80
7.48
3.24
4.39
154.25
1
1
0.90
7.48
3.24
4.38
154.25
1
1
1.00
7.48
3.23
4.37
154.25
1
1
1.10
7.48
3.22
4.35
154.25
1
1
1.20
7.48
3.22
4.34
154.25
1
1
1.30
7.48
3.21
4.33
154.25
1
1
1.40
7.48
3.20
4.31
154.25
1
1
1.50
7.48
3.20
4.30
154.25
1
1
1.60
7.48
3.19
4.29
154.25
1
1
1.70
7.48
3.19
4.28
154.25
1
1
1.80
7.48
3.18
4.26
154.25
1
1
1.90
7.48
3.17
4.25
154.25
1
1
2.00
7.48
3.17
4.24
154.25
1
1
2.10
7.48
3.16
4.23
154.25
1
1
2.20
7.48
3.15
4.21
154.25
1
1
2.30
7.48
3.15
4.20
154.25
1
1
2.40
7.48
3.14
4.19
154.25
1
1
2.50
7.48
3.13
4.18
154.25
1
1
2.60
7.48
3.13
4.16
154.25
1
1
2.70
7.48
3.12
4.15
154.25
1
1
2.80
7.48
3.12
4.14
154.25
1
1
2.90
7.48
3.11
4.13
154.25
1
1
3.00
7.48
3.10
4.11
154.25
1
1
3.10
7.48
3.10
4.10
154.25
1
1
3.20
7.48
3.09
4.09
154.25
1
1
3.30
7.48
3.08
4.08
154.25
1
1
3.40
7.48
3.08
4.07
154.25
1
1
3.50
7.48
3.07
4.05
154.25
1
1
3.60
7.48
3.07
4.04
154.25
1
1
3.70
7.48
3.06
4.03
154.25
1
1
3.80
7.49
3.05
4.02
154.25
1
1
3.90
7.49
3.05
4.01
154.25
1
1
4.00
7.49
3.04
3.99
154.25
1
1
4.10
7.49
3.03
3.98
154.25
1
1
4.20
7.49
3.03
3.97
154.25
1
1
4.30
7.49
3.02
3.96
154.25
1
1
4.40
7.49
3.02
3.95
154.25
1
1
4.50
7.49
3.01
3.94
154.25
1
1
4.60
7.49
3.00
3.92
154.25
1
1
4.70
7.49
3.00
3.91
154.25
1
1
4.80
7.50
2.99
3.90
154.25
1
1
4.90
7.50
2.99
3.89
154.25
1
1
5.00
7.
Page 1

;10 �00 m 83:1U)110
ischarger TWSA PLANT #1
eceiving Stream TUCHASEGEE-RIDER
--------------------------------------------
he End D.O. is 9.60 mg/l.
he End CBOD is 3.01 mg/l.
he End NBOD is 3.14 mg/1-
DO Min -- - -
(mg/1) Milepoint
---------------
egment 1 9.46 0.00
Reach 1
Tess any key to continue._
WINTER
- — -- WLA--WLA--- - WLA -
CBOD NBOD DO Waste Float
Reach # (mg/1) Cmg/l> Cmg/1) (mgd)
------- ---- ---- ------------
1

TWSA3_W.OUT
3.0 MGD WINTER
Seg #
Reach #
Seg Mi
D.O.
CBOD
NBOD
FLOW
1
1
0.00
9.46
3.06
3.19
188.75
1
1
0.10
9.47
3.06
3.19
188.75
1
1
0.20
9.48
3.05
3.19
188.75
1
1
0.30
9.49
3.05
3.18
188.75
1
1
0.40
9.50
3.05
3.18
188.75
1
1
0.50
9.52
3.04
3.18
188.75
1
1
0.60
9.53
3.04
3.17
188.75
1
1
0.70
9.54
3.04
3.17
188.75
1
1
0.80
9.55
3.03
3.16
188.75
1
1
0.90
9.56
3.03
3.16
188.75
1
1
1.00
9.57
3.03
3.16
188.75
1
1
1.10
9.58
3.02
3.15
188.75
1
1
1.20
9.59
3.02
3.15
188.75
1
1
1.30
9.59
3.02
3.15
188.75
1
1
1.40
9.
Page 1

NC0039578
Facility: TWSA Plant #1
Discharge to: Tuckasegee River
Residual Chlorine Ammonia as NH3
(summer)
7Q10 (CFS)
149.E
7Q10 (CFS)
149.6
DESIGN FLOW (MGD)
3.5
DESIGN FLOW (MGD)
3.5
DESIGN FLOW (CFS)
5.425
DESIGN FLOW (CFS)
5.425
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 (%)
Allowable Conc. (ug/1)
3.50
79
IWC (%)
Allowable Concentration (mg/1)
22.51
q�;
v /L
Ammonia as NH3
(winter)
7010 (CFS)
184.1
Fecal Limit
200/100ml
DESIGN FLOW (MGD)
3.5
Ratio of 27.6:1
DESIGN FLOW (CFS)
5.425
STREAM STD (MG/L)
1.8
UPS BACKGROUND LEVEL (MG/L)
0.22
IWC (%)
2.86
Allowable Concentration (mq/I)
— —55.42
For Minor domestic -type facilities
Minimum of 2 mg/I (summer) NH3-N; 4 mg/I (winter) NH3-N
Chlorine.
Residual chlorine must be capped at 28 ug/I to protect for acute toxicity effects

9
SUMMER
---------- MODEL RESULTS----------
harger = TWSA PLANT #1
End D.O. is 7.47 mg/l.
End CBOD is 3.17 mg/l.
End NBOD is 3.88 mg/l.
- - - - - 1,lLA -- - WLA - 4JLA
DO Min CBOD NBOD DO Waste Flow
(mg/1) Milepoint Reach # (mg/1) (mg/1) (mg/1) (mgd)
---------------------- ---- ---- ------------
egment 1 7.44 1.40 1
Reach 1 45.00 101.00 0.00 3.50000
ress any key to continue__

TWSA35_S.OUT
3.5 SUMMER
5eg #
Reach #
Seg Mi
D.O.
CBOD
NBOD
Flaw
1
1
0.00
7.45
3.50
4.50
155.03
1
1
0.10
7.45
3.50
4.49
155.03
1
1
0.20
7.45
3.49
4.47
155.03
1
1
0.30
7.45
3.48
4.46
155.03
1
1
0.40
7.45
3.48
4.45
155.03
1
1
0.50
7.45
3.47
4.43
155.03
1
1
0.60
7.45
3.46
4.42
155.03
1
1
0.70
7.45
3.46
4.41
155.03
1
1
0.80
7.45
3.45
4.39
155.03
1
1
0.90
7.44
3.44
4.38
155.03
1
1
1.00
7.44
3.44
4.37
155.03
1
1
1.10
7.44
3.43
4.36
155.03
1
1
1.20
7.44
.3.42
4.34
155.03
1
1
1.30
7.44
3.41
4.33
155.03
1
1
1.40
7.44
3.41
4.32
155.03
1
1
1.50
7.44
3.40
4.30
155.03
1
1
1.60
7.44
3.39
4.29
155.03
1
1
1.70
7.44
3.39
4.28
155.03
1
1
1.80
7.44
3.38
4.27
155.03
1
1
1.90
7.44
3.37
4.25
155.03
1
1
2.00
7.44
3.37
4.24
155.03
1
1
2.10
7.45
3.36
4.23
155.03
1
1
2.20
7.45
3.35
4.22
155.03
1
1
2.30
7.45
3.35
4.20
155.03
1
1
2.40
7.45
3.34
4.19
155.03
1
1
2.50
7.45
3.33
4.18
155.03
1
1
2.60
7.45
3.33
4.17
155.03
1
1
2.70
7.45
3.32
4.15
155.03
1
1
2.80
7.45
3.31
4.14
155.03
1
1
2.90
7.45
3.31
4.13
155.03
1
1
3.00
7.45
3.30
4.12
155.03
1
1
3.10
7.45
3.29
4.11
155.03
1
1
3.20
7.45
3.29
4.09
155.03
1
1
3.30
7.45
3.28
4.08
155.03
1
1
3.40
7.45
3.27
4.07
155.03
1
1
3.50
7.45
3.27
4.06
155.03
1
1
3.60
7.45
3.26
4.05
155.03
1
1
3.70
7.46
3.25
4.03
155.03
1
1
3.80
7.46
3.25
4.02
155.03
1
1
3.90
7.46
3.24
4.01
155.03
1
1
4.00
7.46
3.23
4.00
155.03
1
1
4.10
7.46
3.23
3.99
155.03
1
1
4.20
7.46
3.22
3.98
155.03
1
1
4.30
7.46
3.21
3.96
155.03
1
1
4.40
7.46
3.21
3.95
155.03
1
1
4.50
7.46
3.20
3.94
155.03
1
1
4.60
7.47
3.20
3.93
155.03
1
1
4.70
7.47
3.19
3.92
155.03
1
1
4.80
7.47
3.18
3.91
155.03
1
1
4.90
7.47
3.18
3.89
155.03
1
1
5.00
7.
Page 1

_1
WI
---------- MODEL RESULTS
_T 41S A-PLA NT_#1-- -_ - —
'he End
D.O.
is 9.56 mg/l.
,he End
CBOD
is 3.18 mg/l.
he_End_NBOD_is
----------------------------------------------------------------------
--- 3-.49-mg/-1.--------
- ----
WLA
WLA
WLA
DO Min
CBOD
NBOD
DO Uaste Flom
(mg/1) Milepo-int_Reach_#
----------------------
Cmg/-1)
----
Cmg/-1)
----
Cmg/l) (mgd-)—
------------
�egment
1
9.42 0.00 1
Reach
1
45.00
90.00
0.00 3.50000
Press any key to continue.

TWSA35_W.OUT
3.5 MGD WINTER
Seg #
Reach #
Seg Mi
D.O.
CBOD
NBOD
F10W
1
1
0.00
9.42
3.23
3.55
189.53
1
1
0.10
9.43
3.23
3.54
189.53
1
1
0.20
9.44
3.22
3.54
189.53
1
1
0.30
9.46
3.22
3.54
189.53
1
1
0.40
9.47
3.22
3.53
189.53
1
1
0.50
9.48
3.21
3.53
189.53
1
1
0.60
9.49
3.21
3.52
189.53
1
1
0.70
9.50
3.21
3.52
189.53
1
1
0.80
9.51
3.20
3.52
189.53
1
1
0.90
9.52
3.20
3.51
189.53
1
1
1.00
9.53
3.20
3.51
189.53
1
1
1.10
9.54
3.19
3.51
189.53
1
1
1.20
9.55
3.19
3.50
189.53
1
1
1.30
9.56
3.19
3.50
189.53
1
1
1.40
9.
Page 1

NC0039578
Facility: TWSA Plant #1
Discharge to: Tuckasegee River
Residual Chlorine
Ammonia as NH3
(summer)
7010 (CFS)
149.6
7010 (CFS)
149.6
DESIGN FLOW (MGD)
4
DESIGN FLOW (MGD)
4
DESIGN FLOW (CFS)
6.2
DESIGN FLOW (CFS)
6.2
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 (%)
3.98
IWC (%)
Allowable Conc. (ug/I)
427.127.19
Allowable Concentration (mg/1)
19.82
Ammonia as NH3
(winter)
7010 (CFS)
184.1
Fecal Limit
200/100ml
DESIGN FLOW (MGD)
4
Ratio of 24.1 :1
DESIGN FLOW (CFS)
6.2
STREAM STD (MG/L)
1.8
UPS BACKGROUND LEVEL (MG/L)
0.22
IWC (%)
3.26
Allowable Concentration (mg/0 -
48.72
For Minor domestic -type facilities:
Minimum of 2 mg/I (summer) NH3-N; 4 mg/I (winter) NH3-N
Chlorine:
Residual chlorine must be capped at 28 ug/I to protect for acute toxicity effects

d
---------- MODEL RESULTS
scharger TWSA PLANT #i
ceiving-Stream—: TUCHASEGEE-RIUER--
--------------------------------------------
e End D.O. is 7.42 mg/l.
e End CBOD is 3.49 mg/l.
e End NBOD is 4.16 ma/1.
DO Min CBOD
(mg/1) Milepoint Reach # (mg/1)
------ —--------- -------- ----
egment 1 7.41 i.10 1
Reach 1 45.00
ress any key to continue._
-WLA - WLA - --
NBOD DO Waste Flow
(mg/1) (mg/1) (mgd)

TWSA4_S.OUT
4.0 MGD SUMMER
I
Seg #
I Reach # I
Seg Mi
I D.O. I
CBOD I
NBOD I
FIOW
1
1
0.00
7.41
3.71
4.54
155.80
1
1
0.10
7.41
3.70
4.53
155.80
1
1
0.20
7.41
3.70
4.52
155.80
1
1
0.30
7.41
3.69
4.50
155.80
1
1
0.40
7.41
3.68
4.49
155.80
1
1
0.50
7.41
3.67
4.48
155.80
1
1
0.60
7.41
3.67
4.46
155.80
1
1
0.70
7.41
3.66
4.45
155.80
1
1
0.80
7.41
3.65
4.44
155.80
1
1
0.90
7.41
3.64
4.42
155.80
1
1
1.00
7.41
3.64
4.41
155.80
1
1
1.10
7.41
3.63
4.40
155.80
1
1
1.20
7.41
3.62
4.38
155.80
1
1
1.30
7.41
3.62
4.37
155.80
1
1.40
7.41
3.61
4.36
155.80
1
1
1-50
7-41
--3-60
4-35-155:-80-
V/ 1
1
1.60
7.41
3.59
4.33
155.80
1
1
1.70
7.41
3.59
4.32
155.80
/
gn�',^�
1
1
1.80
7.41
3.58
4.3
155.80
1
1.90
7.41
3.57
4.30
155.80
X
1
1
2.00
7.41
3.57
4.28
155.80
1
1
2.10
7.41
3.56
4.27
155.80
F
1
1
2.20
7.41
3.55
4.26
155.80
1
1
2.30
7.41
3.54
4.24
155.80
1
1
2.40
7.41
3.54
4.23
155.80
1
1
2.50
7.41
3.53
4.22
155.80
/Un S
1
1
2.60
7.41
3.52
4.21
155.80
1
1
1
1
2.70
2.802J
.4
3.52
3.51
4.20
4.18
155.80
155.80
1
1
2.9043.50
4.17
155.80
1
1
3.00.4
r..4
lb,o. b �(-s 4
lAeecl2,e
Page 1

---------- MODEL RESULTS
ischarger = TWSA PLANT #1
eceiving-Stream TUCKASEGEE-RIUER----
--------------------------------------------
he End D.O. is 9.66 mg/l.
he End CBOD is 3.30 mg/l.
he End NBOD is 3.77 mg/l.
-- -- DO Min
(mg/1) Milepoint Reach #
-----------------------
egment 1 9.38 0.00 1
Reach 1
ress any key to continue._
WINTER
WLA- -WLA
CBOD NBOD
(mg/1) (mg/1)
-MLA — -
DO Waste Flom
(mg/1) (mgd)

TWSA4_W.OUT
4.0 WINTER
Seg #
Reach #
Seg Mi
D.O.
CBOD
NBOD
Flow
1
1
0.00
9.38
3.40
3.90
190.30
1
1
0.10
9.40
3.40
3.90
190.30
1
1
0.20
9.41
3.39
3.89
190.30
1
1
0.30
9.42
3.39
3.89
190.30
1
1
0.40
9.43
3.39
3.88
190.30
1
1
0.50
9.44
3.38
3.88
190.30
1
1
0.60
9.45
3.38
3.87
190.30
1
1
0.70
9.46
3.38
3.87
190.30
1
1
0.80
9.47
3.37
3.87
190.30
1
1
0.90
9.48
3.37
3.86
190.30
1
1
1.00
9.49
3.37
3.86
190.30
1
1
1.10
9.50
3.36
3.85
190.30
1
1
1.20
9.51
3.36
3.85
190.30
1
1
1.30
9.52
3.35
3.85
190.30
1
1
1.40
9.53
3.35
3.84
190.30
1
1
-1-50---9.54---3735
3.84
190.30
1
1
1.60
9.54
3.34
3.83
190.30
1
1
1.70
9.55
3.34
3.83
190.30
1
1
1.80
9.56
3.34
3.82
190.30
1
1
1.90
9.57
3.33
3.82
190.30
G(p� 1
1
2.00
9.58
3.33
3.82
190.30
1
1
2.10
9.59
3.33
3.81
190.30
1
1
2.20
9.60
3.32
3.81
190.30
1
1
2.30
9.61
3.32
3.80
190.30
1
1
2.40
9.61
3.32
3.80
190.30
1
1
2.50
9.62
3.31
3.80
190.30
1
1
2.60
9.63
3.31
3.79
190.30
1
1
2.70
9.64
3.31
3.79
190.30
1
1
2.80
9.65
3.30
3.78
190.30
1
1
2.90
9.65
3.30
3.78
190.30
1
1
3.00
Page 1

Tuckaseigee Water & Sewer Authority
Serving Jackson County
1246 West Main Street .:.:_�..•�,;,.�.---
Sylva, NC 28779
Ph. [phone]
Fax [phone]
Dec.14, 2005
Mr. Dave Goodrich
NPDES Unit
1617 Mail Service Center
Raleigh NC 27699-1617
Subject: Speculative Effluent Limits
Dear Mr Goodrich,
In mid 2002, we asked for and received a letter from your office detailing speculative
effluent limits for an expanded discharge on our municipal W WTP. The expansion was not
pursued at that time. We are now in negotiations with the state for an SOC and part of the
plan is an expansion of the current WWTP. The facility is known as the TWSA Plant #I
(NPDES # NC0039578) and is currently rated at 1.5 mgd and discharges from one outfall
into the Tuckaseegee River in the Little Tennessee River Basin.
We would like to confirm the speculative limits at the originally proposed 3 mgd flow
i ate(copy attached), and request speculative limits for 3.5 mgd and 4 mgd respectively.
We do not anticipate growth projections to show a need for flows greater than 4 mgd.
Please advise me of any more information or data you need to respond to this request.
Please don't hesitate to contact me at 828-586-9318 or at the letterhead address with any
questions or comments.
Your attention to this matter is greatly appreciated.
Sincerely,
Stan Bryson
Wastewater Operations Superintendent
Tuckaseigee water and Sewer Authority
xc: McGill Associates
Lofquist Associates
Joe Cline, Executive Director, TWSA

Stata of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality I
Michael F. Easley, Governor
William G. Ross, Jr., Secretary
Alan W. Klimek, P.E., Director
Mr. Stan Bryson
Tuckaseigee Water and Sewer Authority
32 Asheville I- ghway
P.O. Box 1051
Sylva, North Carolina 28779
Dear Mr. Bryson:
W,G,_5262
July 29, 2002
NCDENR
Subject: Speculative Effluent Limits
TWSA Plant #1
Jackson County
This letter is in response to your request for speculative effluent limits for expanded discharges at the
-Tuckaseigee Water and Sewer Authority's Jackson County WIVI-P (NC0039578). The Div Sion of Water Quality
(Division) has prepared a response to your request for speculative lir its at 3.0 MGD at this plant.
The speculative limits were developed based on our understanding of the proposal, in addition to our
understanding of present environmental conditions at the proposed discharge location. The Division can not
guarantee that an NPDES permit will be issued at the proposed location. Final decisions can only be made after the
Division receives and evaluates a formal permit application for the proposed discharge.
In accordance with the North Carolina General Statues, the practicable waste treatment and disposal
alternative with the least adverse impact on the environment is required to be implemented. Therefore, prior to
submittal of an NPDES application, a detailed alternatives analysis must be prepared to assure that the
environmentally sound alternative was selected from the reasonable cost effective options. Attached is a guidance
document that will assist you or your consultant in preparing an engineering alternatives analysis. Please be certain
that sufficient documentation demonstrating the need for the additional flow is provided. In addition, if the
proposed expansion will use public monies, such an upgrade would have to undergo the State Environmental Policy
Act (SEPA) process. You are encouraged to contact the Division's SEPA contact, J. Todd Kennedy at (919) 733-
5083 ext. 555 prior to beginning plans for expansion.
Based on the available information, tentative limits for the proposed discharge to the Tuckasegee River 3.0
MGD for the Jackson County WWTP are attached. The limits are based on streamflows calculated based upon
regional equations listed in the USGS document Lom Flom Charactens icy ofSImamr in North Carolina. The following
flow calculations were made:
!ReceivingStream Tuckase ee River
era e Flow 635 cfs
mer 7 in 149.6 cfsnter 7Q„� 184.1 cfs
The above flow information is somewhat lower than the previous flow estimates for the receiving stream
on which your current permit limits are based. You may wish to contact the USGS to obtain a new flow estimate
1617 Mail service Center, Raleigh, North Carolina 27699-1617 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50 % recycled / 10% post -consumer paper

for the Tuckasegee River. Please call Mr. Curtis Weaver of USGS at [phone] if you would like to pursue this
option.
This information was used in conjunction with the proposed effluent characteristics to develop tentative
limits. Please be advised that the limits and monitoring frequencies below were based on the information presented
in the speculative limits request. A complete. evaluation of these limits and monitoring frequencies in addition to
monitoring requirements for metals and other toxicants will be addressed upon receipt of a formal NPDES permit
application.
A water quality model of the proposed discharge indicated that it would not cause a violation of the
instream dissolved oxygen standard of 6 mg/L given the effluent limits below. Please note that the following are
monthly average limits for the effluent characteristics listed:
BODs
Total Suspended Residue
Dissolved Oxygen
NH3-N
Total Residual Chlorine
TWSA Plant #1
(Jackson
30 mg/L
30 mg/L
Monitor only
Monitor only
17 µg/L
200/100 mL
Should you have any questions or if you need any additional information, please feel free to contact Natalie
Sierra at [phone], extension 551.
_� j Sincer ly,
David A. Goodric(���
Supervisor, NPDES Unit
cc: Asheville Regional Office
Central Files
NPDES Unit Files
Callic Dobson, Planning Branch
Kurt Wright, PE: W.K. Dickson & Companv, Inc.
1200 Ridgefield Road
Suite 180
Asheville, North Carolina 28806