NC0034452_WASTELOAD ALLOCATION_19890808

' NPDES DOCUMENT SCANNING COVER SHEET
NPDES Permit:
NC0034452
Willow Creek WWTP
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Speculative Limits
Report
Instream Assessment (67B)
Environmental Assessment (EA)
Permit
History
Document Date:
August 8, 1989
I
Tlzie document im printed on reume paper - ignaore suzy
Coate xt oa the rezre - e 014e

THE CITY OF ���° LEXINGTON
NORTH CAROLINA
CARey
'GROWING WITH THE. PIEDMONT'
OFFICE OF THE
MAYOR
August 8, 1989
R. Paul Wilms
NRCD/DEM
PO Box 27687
Raleigh, NC 27611
Re: Willow Creek Builders, Inc. Permit
NPDES Permit #NC0034452 - Davidson
Dear Mr. Wilms:
tIl
RECEIVED
AUG 1 4 190
TECHNICAL SUM)'Al BRANCH
F
Modification
County
Your letter dated July 24, 1989 to R. Duke Whisenant, City Manager
of the City of Lexington did not address his request for a public
meeting to be held in Davidson County on this permit (by letter
dated June 8, 1989).
Phe cities of Lexington and Thomasville are extremely concerned
with the issuance of this permit. The Willow Creek Plant
discharges into the drainage area of. Lake Thom-A-Lex. This lake is
the sole water supply for the cities of Lexington and Thomasville.
Any expansion or change in discharges ,in the drainage area of this
lake will ultimately impact the water quality of this lake.
,
We regard issuance of this permit as.the first step in degradation
Of our water supply. We are aware of pressures for further
expansion and development in this area. We feel that the Raleigh
office of DEM/NRCD has been less than sensitive to our concerns
about expansion and development in this watershed. All studies of
the Abbotts Creek basin are being done in water below the dam of
Lake Thom-A--Lex on Abbotts Creek.
We are writing to continue Mr. Whisenant's request for a public
meeting on this permit.
Honorable H ro��=—
Mayor of the City of Lexington
Honorable James Norton
Mayor of the City of Thomasville
cc: Larry Coble, NRCD/DEM
Ernest Cain, DHS
Duke Whisenant, City Manager,'City of Lexington
Dennis Roberts, Dir. Public Utilities, City of Lexington
Kyle Williams, City Manager, City of Thomasville
Roger Bryant, Dir. Public Utilities, City of Thomasville
Trevor Clements, NRCD/DEM
Arthur Mouberry, NRCD/DEM
I
22 WEST CENTER STREET • L.EXINGTON, NORTH CAROLINA 27292 9 PH. 704-243-2489

Chi# of c��lztlrzli>
Thomasville, North Carolina 27360
August 7, 1989
Office of the Mayor
James G. Norton
Mr. Paul Wilms, Director RECO f E®
N. C. Department of Natural Resources
and Community Development AUG 0 8 1g8g
512 North Salisbury Street
Raleigh, North Carolina 27611 TECHNICAL SUPPORT BRANCH
Re: Willow Creek Builders, Inc. Permit Modification
NPDES Permit #NC0034452 - Davidson County
Dear Mr. Wilms:
Your letter dated July 24, 1989 to R. Duke Whisenant, City Manager of
the City of Lexington, did not address his request for a public meeting
to be held in Davidson County on this permit (by letter dated June 8,
1989).
The cities of Lexington and Thomasville are extremely concerned with
the issuance of this permit. The Willow Creek Plant discharges into the
drainage area of Lake Thom-A-Lex. This lake is the sole water supply
for the cities of Lexington and Thomasville. Any expansion or change
in discharges in the drainage area of this lake will ultimately impact
the water quality of this lake.
We regard issuance of this permit as the first step in degradation of our
water supply. We are aware of pressures for further expansion and de-
velopment in this area. We feel that the Raleigh office of DEM/NRCD has
been less than sensitive to our concerns about expansion and development
of this watershed. All studies of the Abbotts Creek basin are being done
in water below the dam of Lake Thom-A-Lex on Abbotts Creek.
We are writing to continue Mr. Whisenant's request for a public hearing
on this permit.
Honorable Harold Bowen
Mayor
City of Lexington
Mayor
City of Thomasville

0
,, srnre„
r�f2R
State of North Carolina
Department of Natural Resources and Community Development
Division of Environmental Management
512 North Salisbury Street • Raleigh, North Carolina 27611
James G. Martin, Governor
William W. Cobey, Jr., Secretary
July 24, 1989
Mr. Duke Whisenant
City Manager
The City of Lexington
22 West Center Street
Lexington, North Carolina 27292
Subject: Willow Creek Builders, Inc.
Permit Modification
NPDES Permit No. NG0034452
Davidson County
Dear Mr. Whisenant,
R. Paul Wilms
Director
I am writing in response to your letter of June 8, 1989, concerning the Willow
Creek Builders, Inc. NPDES discharge permit. Your comments concerning the water
quality of the receiving stream for this discharge are appreciated, especially
since the receiving stream for the discharge flows into the City of Lexington's
water supply. This situation has been carefully analyzed by our Technical
Support Branch and the Division of Health Services within the NC Dept. of Human
Resources.
The Willow Creek WWTP discharges into Abbotts Creek approximately six miles
above Lake Tom-a-Lex. In light of the water supply designation of these
receiving waters, the Division of Health Services has reviewed the proposed
NPDES permit and have stated that they will approve of an expansion of the
facility from 0.04 MGD to 0.08 MGD provided the existing permitted effluent
limitations for BODS and NH3N are cut in half to compensate for the doubling of
the wasteflow. Accordingly, DEM has decided to reduce the effluent limitations
for BODS and NH3N to 9 mg/1 and 5.5 mg/1 for the summer, respectively, and to
15 mg/l and 11 mg/l for the winter, respectively.
A Level. B modeling analysis for oxygen -consuming wastes has been performed by
DEM's Technical Support Branch starting at the discharge point on Abbotts Creek
and extending to the point where the creek enters the lake. The model results
predict instream conditions to return to what we consider normal background lev-
els before the stream flow enters the lake. Nutrient concentrations (i.e. Total
Phosphorus and Total Nitrogen) may constitute the only elevated parameters
entering the lake downstream. However, with a dilution factor of 25 even under
P.O. Box 27687, Raleigh, North Carolina 27611-7687 Telephone [phone]
An Equal Opportunity Affirmative Action Employer

critical low flow conditions (i.e. 7Q10), these elevated concentrations may not
pose a significant threat. DF,M :is currently studying the effects of elevated
nutrient loading on the Abbotts Creek watershed and High Rock Lake, and a
reopener clause will be added to the permit to make the permittee aware of these
concerns and to allow for nutrient limitations to be added to the permit if
deemed necessary.
In light of the facts above, it is the Division's intention to go forward with
issuance of the proposed permit. If you have any further questions regarding
this matter please contact Mr. Trevor Clements or Mr. Arthur Mouberry from my
staff at [phone].
Sucerely,
R. Paul. Wilms
cc: tTrevor,Clement's]
Arthur Mouberry
Steve Mauney
Central Piles

.. � of tEwti
THE CITY OF ����c7 LEXINGTON
NORTH 20 ;. ;•� CAROLINA lY
''GROIVING WITH THE PIEDMONT'
OFFICE OF THE
CITY MANAGER } ........ __.... `
RECEIVED
June 8, 1989
RECEt`" rD
Public Notice J01v 1 s I�-,o�
State of North Carolina
Environmental Management Commission PERMITS g Ew6 t�RIiJG
PO Box 27687 k
Raleigh, NC 27611-7687 '}
Re: NPDES Permit #NC0034452, Notification of Intent to Issue a
Permit to willow Creek Builders, Inc.
Dear Sirs:
I am writing to make the following comments about and objections to
various provisions of the above permit.
1) Please refer to the attached copies of my letter dated February
1, 1989 to Ernest Cain and February 7, 1989 to Arthur Mouberrv_
regarding this permit for previous comments on this permit as
earlier proposed.
2) I would like to object to the omission of a "winter" limit for
ammonia nitrogen in the finalized permit.
a) This omission is not consistent with permits issued
municipal plants in Davidson Countv.
b) This omission coupled with the winter BOD limit gives the
discharger a "free ride" in the months from September 30
through April 1.
Lake Thom—A—Lex is the sole water supply for the cities of
Thomasville and Lexington for the present and foreseeable future.
The City is in the process of preparing a request to reclassify
Abbotts Creek to a wS II designation. Also, in the near future the
City will develop watershed management plan for the Lake and its
drainage basin. It is the intention of the City to take a more
active role in insuring the quality of water in its drinking water
supply.
22 WEST CENTER STREET

On behalf of the City of Lexington, I am herewith requesting a
Public meeting be held locally to air views on this proposal.
Sincerely,
9 a4d
Duke whisenant
City Manager
RDw/tep

THE CITY OF 'y�G1�� LEXINGTON
NOR,rH �o .o CAROLINA
�N CARO",
OFFICE OF THE "GROWING WITH THE PIEDMONT"
CITY MANAGER
Y
R>E; ENV FED
February 1, 1989 J,,,, od9
PERM115 a 061"EERING
Mr. Ernest Cain
North Central Regional Office
N.C. Dept. Human Resources
Division of Health Services
310 E. Third St., Suite 200
Winston-Salem, NC 27101
w
Re: NPDES permits for discharges within the drainage areas of
Lexington's water supplies
Dear Mr. Cain:
The City of Lexington has two (2) high quality water supplies -
Lake Thom-A-Lex and it's "Old City Lake". I feel that it is
necessary to take responsible actions when necessary to prevent
degradation of these water supplies.
With regard to NPDES permits for discharges within the drainage
areas of our two (2) water supplies, I will recommend that the
Lexington City Council oppose issuance or revision of any permits
which will increase pollutant loadings in the drainage of these
lakes; specifically:
1. Permits which will increase loadings of solids and oxygen
demanding pollutants
2. Permits which will increase nutrient loadings-.
3. Permits which will increase loadings of toxic materials.
Please accept this letter as a preliminary notice of concern.
I specifically request that It be notified of any proposals for
RECEIVED
JUN 1 b lyny
PERMITS & ENG1Nt.LKING

changes in the stream pollutant loading characterists in order that
Lexington may respond.
/ Sincerely,
%
R. Duke Whisenant
City Manager
RAS/tep
cc: W.E. Venrick
Larry Coble
Mike Mickey
Richard Baxley
Dennis Roberts✓
Roger Spach
City Council
City Attorney

of ue��c
THE CITY OF °
t LEXINGTON
NORTH z �� CAROLINA
CAR�v
OFFICE OF THE "GROWING WITH THE PIEDMONT'
CITY MANAGER
February 7, 1989
Mr. Arthur Mouberry
Permits and Engineering Section
NRCD/DEM
PO Box 27687
Raleigh, NC 27611
Re: willow creek Builders, Inc. wastewater treatment facilities,
NPDES Permit #NC0034452-280-262
Dear Mr. Mouberry:
I am writing on behalf of the City of Lexington to express concern
over any potential negotiations of permit limit revisions of the
above NPDES permit.
This treatment plant discharges into Abbotts Creek above Lake
Thom-A-Lex. This lake is presently the primary drinking water
supply for the cities of Lexington and Thomasville. It is my
concern that permitting additional pollutant loading will degrade
the water quality of this reservoir.
In order to protect the water quality of this reservoir, I will
recommend that the City Council object to any modification in this
permit which will increase:
1. Loading of oxygen demanding pollutants
2. Loading of suspended solids
3.
Loading
of
nutrients (specifically phosphorous and nitrates)
4.
Loading
of
toxic materials
5. Loading of other pollutants which would pose a threat to the
water quality of this reservoir

r
Twill request that I be notified of any proposed modifications in
the above permit.
Sincerely,
% y�
Duke Whisenant
City Manager
DW/tep
cc: Roger Bryant, City of Thomasville
Mike Mickey, NRCD
Richard Baxley, Davidson County
Ernest Cain, NRCD
W.E. Venrick, Env. Health Services
Dennis Roberts, City of Lexington
Roger Spach, City of Lexington

Yhcsdeliq doua 4V R5�ouse l�
ID CAJ9ItK jt)v-
SUMMER
MODEL TAKEN TO THOM--A-LEX LAKE
WITH EXISTING LIMITS
---------- MODEL RESULTS ----------
Discharger o WILLOW CREEK BUILDERS, INC.
Receiving Stream ; ABBOTTS CREEK
The End D.O. is 7.81 ma/l.
The End CBOD is 1.29 mg/l.
The End NBOD is 0.67 mg/l.
WLA
WLA
WLA
DO Min
CBOD
NBOD
DO
Waste Flow
(mg/1) Milepoint Reach 4k
(mg/1)
(mg/1)
(mg/1)
(mgd)
Segment
1
7.35 0.00 1
Reach
1
27.00
49.5i>
5.00
0.04000
Reach
2
45.00
90.00
0.0O
0.00060
Reach
3
45.00
90.00
0.00
0.00060
Reach
4
45.00
90.00
0.00
0.00060
Reach
5
0.00
0.00
0.00
0.00000
Reach
6
0.00
0.00
0.00
0.0O000
Reach
7
0.00
0.00
0.00
0.0000o
�I
It
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i� c i la Cbl�lC(4 VI-d '1a . Og Wt c� e Cu `ice V- wu
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yam..

*** MODEL SUMMARY DATA ***
Discharger : WILLOW CREEK BUILDERS, INCSubbasi.n : 030707
Receiving Stream : ABBOTTS CREEK Stream Class: WS-III
Summer 7010 . 1.55 Winter 7010 : 3.3
Design Temperature: 25.
ILENBTHI SLOPEI VELOCITY I DEPTHI K.d I Kd I Ka 1 Ka I KN I KN i KNR I KNR I
I mile I ft/mil fps I ft Idesionl POO Idesionl 1200 Idesionl 9200 Idesignl 3201 I
I I I I I I I I 1 I I I I
Segment 1 1 0.151 10.201 0.125 10.93 1 0.29 1 0.23 1 2.56 1 2.301 0.44 1 0.30 1 0.44 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
Segment 1 1 0.041 10.201 0.126 1 693 1 019 1 013 1 207 1 LAI OA4 1 010 1 OX 1 030 1
Reach 2 1 1 1 1 1 1 1 1 1 1 1 1 1
1 I I I I I I I I I I I I
Segment 1 1 0.041 10.201 0.126 1 0.93 1 0.29 1 0.23 1 2.58 1 2.311 0.44 1 0.30 1 0.44 1 0.00 1
Reach 3 1 1 1 1 1 1 1 1 1 1 1 1 1
I I I I I I I I I I I I I
Segment 1 1 1.501 10.201 0.128 1 0.95 1 0.29 1 0.23 1 2.62 1 2.351 0.44 1 0.30 1 0.44 1 0.00 1
Reach 4 1 1 1 1 1 1 1 1 1 1 1 1 1
I I I I I I I I I I I I I
Segment 1 1 1.201 8.301 0.143 1 1.12 1 0.28 1 0.23 1 2.37 1 2.131 0.44 1 0.30 1 0.44 1 0.00 I
Reach 5 1 1 1 1 1 1 1 1 1 1 1 1 1
I I I I I I ! I I I I I I
Segment I 1 1.801 11.001 0.162 1 1.11 1 0.30 1 0.24 1 3.58 1 3.211 0.44 1 0.30 1 0.44 1 0.00 1
Reach 6 1 1 1 1 1 1 1 1 1 1 1 1 1
-----------------------------------------------------------------------------------------------------
I I I I I I I I I I I I I
Segment 1 1 1.801 5.401 0.134 1 115 1 017 1 012 1 IN 1 1.301 OA4 1130 1 V44 1 010 1
Reach 7 1 1 1 1 1 1 1 1 1 1 1 1 1
I Flow
I CBOD
I NBOD I
D.O. I
1 cfs
I mg/l.
I mg/1 I
mg/1 I
y
Segment 1
Reach 1
Waste
1 O.062
1 27.000
1 49.500 1
5.000
Headwatersl 1.550
1 2.000
1 1.000 1
7.440
Tributary
1 O.O00
1 2.000
1 1.000 1
7.440
* Runoff
1 0.11O
1 2.000
1 1.000 1
7.440
Segment 1
Reach 2
Waste
1 0.001
1 45.000
1 90.000 1
0.O00
Tributary
1 0.000
1 2.000
1 1..000 1
7.440
* Runoff
1 0.110
1 2.O00
1 1.000 1
7.440
Segment 1
Reach 3
Waste
1 0.001
1 45.000
1 9O.000 1
O.000
Tributary
1 0.000
1 2.000
1 1.000 1
7.440
* Runoff
1 0.110
1 2.000
1 1.000 1
7.440

Seament 1
Reach 4
Waste
1 0.001 1
45.000 1
90.000 1
0.000
Tributary
1 0.000
1 2.000
1 1.000 1
7.440
* Runoff
1 0.110 1
2.000 1
1.000 1
7.440
Segment i
Reach 5
Waste
1 0.000 1
0.000 1
0.000 1
0.000
Tributary
1 0.800 1
2.000
1 1..000 1
7.440
* Runoff
1 0.110 1
2.000 I
1.000 1
7.440
Segment I
Reach 6
Waste
1 0.000 1
0.000 1
0.000 1
0.000
Tributary
1 0.200 1
2.000
1 1.000 1
7.440
* Runoff
1 0.000 1
2.000 1
1.000 1
7.44ii
Segment 1
Reach 7
Waste
1 0,000 1
0.000 1
0.000 1
0.000
Tributary
1 0.000
1 2.000
1 1.000 1
7.440
* Runoff
1 0.080 1
2.000 1
1.000 1
7.440
* Runoff flow is in cfs/mile

Seg #
I Reach #
I Seg Mi I
D.O. I
CBOD
1
1
0.00
7.35
2.96
1
1
0.03
7.35
2.95
1
1
0.06
7.35
2.93
1
1
0.09
7.36
2.92
1
1
0.12
7.36
2.90
1
1
0.15
7.36
2.09
1
2
0.15
7.36
2.91
1.
2
0.16
7.36
2.91
1
2
0.17
7.36
2.90
1
2
0.18
7.36
2.90
1
2
0.19
7.36
2.89
1
3
0.19
7.36
2.92
1
3
0.20
7.36
2.91
1
3
0.21
7.36
2.91
1
3
0.22
7.36
2.90
1.
3
0.23
7.36
2.90
1
4
0.23
7.36
2.92
1
4
0.33
7.37
2.83
1
4
0.43
7.39
2.83
1
4
0.53
7.40
2.79
1
4
0.63
7.41
2.74
1
4
0.73
7.43
2.70
1
4
0.83
7.44
2.66
1
4
0.93
7.46
2.62
1
4
1.03
7.47
2.58
1
4
1.13
7.48
2.54
1
4
1.23
7.50
2.50
1
4
1.33
7.51
2.46
1
4
1.43
7.53
2.43
1
4
1.53
7.54
2.39
1
4
1.63
7.55
2.36
1
4
1..73
7.56
2.32
1
5
1.73
7.53
2.22
1
S
1.83
7.54
2.19
1
5
1.93
7.56
2.17
1
5
2.03
7.57
2.14
1
S
2.13
7.59
2.11
1
5
2.23
7.60
2.09
1
5
2.33
7.61
2.06
1
5
2.43
7.62
2.04
1
5
2.53
7.63
2.01
1
5
2.63
7.65
1.99
1
5
2.73
7.66
1.96
1
5
2.83
7.67
1.94
1
5
2.93
7.68
1.92
1
6
2.93
7.66
1.92
1
6
3.03
7.70
1.90
1
6
3.13
7.73
1.88
1
6
3.23
7.76
1.86
1
6
3.33
7.78
1.84
1
6
3.43
7.80
1.82
1
6
3.53
7.82
1.80
1
6
3.63
7.84
1.78
1
6
3.73
7.86
1.76
1
6
3.83
7.87
1.74
1.
6
3.93
7.38
1.72
1
6
4.03
7.90
1.70
1
6
4.13
7.91
1.69
1
6
4.23
7.92
1.67
1
6
4.33
7.93
1.65
SUMMER
MODEL TAKEN TO THOM-A--LEX LAKE
WITH EXISTING LIMITS
NBOD I
Flow 1
2.67
1.61
2.84
1.62
2.92
1.62
2.80
1.62
2.78
1.63
2.76
1.63
2.81
1.63
2.80
1.63
2.79
1.63
2.78
1.63
2.78
1.63
2.83
1.63
2.92
1.64
2.81
1.64
2.81
1.64
2.30
1.64
2.85
1.64
2.79
1.65
2.71
1.66
2.64
1.67
2.57
1.68
2.51
1.70
2.45
1.71
2.39
1.72
2.33
1.73
2.27
1.74
2.22
1.75
2.17
1.76
2.11
1.77
2.06
1.78
2.01
1.79
1.97
1.91.
1.67
2.61
1.63
2.62
1.60
2.63
1.57
2.64
1.54
2.65
1.51
2.66
1.48
2.67
1.45
2.68
1.42
2.69
1.39
2.70
1.36
2.72
1.34
2.73
1.31
2.74
1..29
2.94
1.27
2.95
1.24
2.95
1.22
2.96
1.20
2.97
1.18
2.98
1.16
2.99
1.14
2.99
1..12
3.00
1.10
3.01
1.09
3.02
1..07
3.03
1.05
3.03
1.03
3.04
1.02
3.05

I
b
4 . 46
/ . `10
1 . b.i
1 . VI -I
•9 . VC)
1
6
4.53
7.94
1.62
0.98
i7
3.07
1 '
6
4.63
7.95
1.60
0.97
3.07
1
6
4.73
7.95
1.59
0.95
3.08
1
7
4.73
7.95
1.58
0.95
3.08
1
7
4.83
7.94
1.56
0.93
3.09
1
7
4.93
7.92
1.55
0.91
3.10
1
7
5.03
7.90
1.53
0.90
3.11
1
7
5.13
7.89
1.51
0.88
3.11
1
7
5.23
7.88
1.49
0.36
3.12
1
7
5.33
7.87
1.48
0.94
3.13
1
7
3.43
7.86
1.46
0.83
3.41
1
7
5.53
7.85
1.44
0.81
3.15
1
7
5.63
7.84
1.43
0.80
3.15
1
7
5.73
7.93
1.41
0.78
3.16
1
7
5.83
7.83
1.39
0.77
3.17
1
7
5.93
7.82
1.39
0.75
3.19
1
7
6.03
7.82
1.36
0.74
3.19
1
7
6.13
7.82
1.35
0.72
3.19
1
7
6.23
7.81
1.33
0.71
3.20
1
7
6.33
7.01
1..32
0.70
3.21
1
7
6.43
7.131
1..30
0.68
3.22
1
7
6.53
7.91
1.29
0.67
3.23
Seg #
I Reach #
I Sea Mi I
D.O. I
CDOD I
NBOD I
Flow

WINTER
MODEL. TAKEN TO THOM-A-LEX LAKE
WITH EXISTING LIMITS
---------- MODEL RESULTS ---------
Discharger : WILLOW CREEK BUILDERS, INC.
Receiving Stream : ABBOTTS CREEK
-----------------------------------------------------------
The
End
D.O.
is 10.02
mg/l.
The
End
CBOD
is 1.88
mg/l.
The
End
NBOD
is 1.40
mg / 1 .
Segment 1
Reach 1
Reach 2
Reach 3
Reach 4
Reach 5
Reach 6
Reach 7
WLA WLA
DO Min CBOD NBOD
(mg/1) Milepoint Reach # (mg/1) (mg/1)
9.20 0.00 1
WLA
DO Waste Flow
(mg/1) (mgd)
45.00
90.00
5.00
0.04000
45.00
90.00
0.00
0.00060
45.00
90.00
0.00
0.00060
45.00
90.00
0.00
0.00060
0.00
0.00
0.00
0.00000
0.00
0.00
0.00
0.00000
0.00
0.00
0.00
0.00000

*** MODEL SUMMARY DATA ***
Discharger : WILLOW CREEK BUILDERS. INGSubbasi'n : 030707
Receiving Stream : ABBOTTS CREEK Stream Class: WS-III
Summer 701O . 1.55 Winter 701O : 3.3
Design Temperature: 14.
ILEN8TH1 SLOPEI VELOCITY I DEPTHI Kd I Kd I Ka I Ka I KN I KN I KNR I KNR I
I mile I ft(mil fps I ft Idesigni H0' Idesigni 120' Idesigni 8204 Idesigni 820' 1
Segment
I I
1 1 0.151
I
10.201
0.218
I
1 1.02
I
1 0.19
I
1 0.25
I I
1 3.50 1
I
3.991
0.19
I
1 0.30
I
1 0.19
I I
1 0.00 1
Reach
-----------------------------------------------------------------------------------------------------
1 I I
I
I
I
I
I I
I
I
I
I I
3egaegt
i
1 1 0.041
10.201
0.218
1 1.02
1 0.19
1 0.25
1 3.52 1
4.011
0.19
1 0.30 1
0.19
1 0.00 1
Reach
-----------------------------------------------------------------------------------------------------
2 1 1
1
1
1
1
1 1
1
1
1
1 1
'segaeA
I
1 1 0.041
10.201
0.218
1 1.02
10.19
1 0.25
1 3.52 1
4.011
0.19
1 0.30 1
0.19
1 0.00 1
Reach
3 1 1
1
1
1
1
1 1
1
1
1
1 1
-----------------------------------------------------------------------------------------------------
i I
I
I
I
I
1 1
1
1
1
1 1
Segment
1 1 1.501
10.201
0.223
1 1.04
1 0.19
1 0.25
1 3.60 1
4.101
0.19
1 0.30 1
0.19 1
0.00 1
Reach
4 1 I
I
I
I
1
I I
I
I
I
I I
I I I I I I I I I I I i i
iegment 1 1 1.201 8.301 0.250 1 113 1 0.18 1 014 1 3.28 1 3031 0.19 1 OAO 1 0.19 1 0.00 1
Reach 5 1 1 1 1 1 1 1 1 1 1 1 1 1
I I I I I I I I I I I 1 I
Segment 1 1 1.801 11.001 0.285 1 112 1 0.19 1 016 1 4.95 1 5041 0.0 1 OAO I E 19 1 100 1
Reach 6 1 1 1 1 1 1 1 1 1 1 1 1 1
I I I I I I I I I I I I I
Segment 1 1 1.801 5.401 0.237 1 1AS 1 0.17 1 0.23 1 2.02 1 2.301 0.19 1 0.30 1 0.19 1 0.00 1
Reach 7 1 1 1 1 1 1 1 1 1 1 1 1 1
I Flaw I
I cfs I
Segment 1 Reach 1
Waste 1 0.O62 1
Headwaters) 3.300 1
Tributary 1 0.000 1
* Runoff 1 O.250 1
Segment 1 Reach 2
Waste 1 0.O01 1
Tributary 1 0.000 1
* Runoff 1 0.250 1
CBOD
I NBOD I
D.O. I
mg/1
I mg/I. I
mg/1 1
45.000
1 90.000 1
5.000
2.000
1 1.000 1
9.280
2.000
1 1.000 1
9.280
2.000
1 1.000 1
9.280
45.000
1 90.000 1
0.000
2.000
1 1.000 1
9.280
2.O00
1 1.O00 1
9.280
Segment 1 Reach 3
Waste 1 0.O01 1
Tributary 1 0.000 1
* Runoff 1 0.25O 1
45.000 1 90.000 1 0.000
2.O00 1 1.O00 1 9.280
2.000 1 1.000 1 9.280

Segment 1
Reach 4
Waste
1 0.001 1
45.000 1
90.000 1
0.000
Tributary
1 0.000
1 2.000
1 1..000 1
9.280
* Runoff
1 0.250 1
2.000 1
1.000 1
9.280
Segment 1
Reach 5
Waste
1 0.000 1
0.000 1
0.000 1
0.000
Tributary
1 1.700
1 2.000
1 1.000 1
9.P80
* Runoff
1 0.250 1
2.000 1
1.000 1
9.280
Segment i
Reach b
Waste
1 0.000 1
0.000 1
0.000 1
0.000
Tributary
1 0.400
1 2.000
1 1.000 1
9.2e0
* Runoff
1 0.200 1
2.000 1
1.000 1
9.2ec)
Segment 1
Reach 7
Waste
1 0.000 1
0.000 1
0.000 1
0.0H00
Tributary
1 0.000
1 2.000
1 1.000 1
9.280
* Runoff
1 0.200 1
2.000 1
1.000 1
9.280
* Runoff flow is in cfs/mile

WINTER
MODEL TAKEN TO THOM-A-LEX LAKE
WITH EXISTING LIMITS
Seg #
I Reach #
I Seg Mi
I D.O. I
CBOD
1
1
0.00
9.20
2.79
1
1
0.03
9.22
2.79
I
1
0.06
9.23
2.78
1
1
0.09
9.27
2.77
1
1
0.12
9.29
2.77
1
1
0.15
9.31
2.76
1
2
0.15
9.31
2.77
1
2
0.16
9.32
2.77
1
2
0.17
9.32
2.77
1
2
0.19
9.33
2.77
1
2
0.19
9.34
2.77
1
3
0.19
9.34
2.78
1
3
0.20
9.34
2.79
1
3
0.21
9.35
2.77
1.
3
0.22
9.36
2.77
1
3
0.23
9.36
2.77
1.
4
0.23
9.36
2.79
1
4
0.33
9.42
2.76
1
4
0.43
9.48
2.74
1
4
0.53
9.53
2.72
1
4
0.63
9.57
2.70
1
4
0.73
9.62
2.68
1
4
0.83
9.65
2.66
1
4
0.93
9.69
2.65
1.
1r
1.03
9.72
2.63
1
4
1.13
9.75
2.61
1
4
1.23
9.77
2.59
1
4
1.33
9.79
2.57
1
4
1.43
9.81
2.56
1
4
1..53
9.83
2.54
1
4
1.63
9.85
2.52
1
4
1.73
9.87
2.51.
1
5
1.73
9.69
2.35
1.
5
1.83
9.71
2.34
1
5
1.93'
9.74
2.33
1
5
2.03
9.76
2.31
1
5
2.13
9.79
2.30
1
5
2.23
9.80
2.29
1
5
2.33
9.82
2.29
1
5
2.43
9.84
2.27
1
5
2.53
9.86
2.26
1
5
2.6.E
9.87
2.25
1
5
2.73
9.99
2.23
1
5
2.83
9.90
2.22
1
5
2.93
9.91
2.21
1
6
2.93
9.87
2.20
1
6
3.03
9.90
2.19
1
6
3.1.3
9.92
2.19
1
6
3.23
9.94
2.17
1
6
3.33
9.96
2.16
1
6
3.43
9.98
2.15
1
6
3.53
10.00
2.14
1
6
3.63
10.01
2.13
1
6
3.73
10.03
2.12
1
6
3.83
10.04
2.11
1
6
3.93
10.05
2.10
1
6
4.03
10.06
2.09
1.
6
4.13
10.07
2.09
1
6
4.23
10.07 i7
2.08
1
6
4.33
10.09
2.07
NBOD I
Flow 1
2.64
3.36
2.63
3.37
2.63
3.38
2.62
3.38
2.61
3.39
2.60
3.40
2.63
3.40
2.62
3.40
2.62
3.41
2..62
3.41
2.62
3.41
2.64
3.41
2.64
3.41
2.63
3.42
2.63
3.42
2.63
3.42
2.65
3.42
2.63
3.45
2.60
3.47
2.58
3.50
2.55
3.52
2.53
3.55
2.51
3.57
2.48
3.6C>
2.46
3.62
2.44
3.65
2.41
3.67
2.39
3.70
2.37
3..72
2.35
3.75
2.33
3.77
2.31
3.eo
1.90
5.50
1..89
5.52
1.88
5.55
1.86
5.57
1.85
5.60
1.94
5.62
1.83
5.65
1.82
5.67
1.80
5.70
1.79
5.72
1.78
5.75
1./7
5.77
1.76
5.80
1..71
6.20
1.70
6.22
1.69
6.24
1.68
1.26
1.67
6.28
1.66
6.30
1.65
6.32
1.65
6.34
1.64
6.36
1.63
6.38
1.62
6.40
1.61
6.42
1.60
6.44
1.59
6.46
1.59
6.49

1
b
W.YIli
AV v17
a. Vb
i +..lo
o. �V
1
6
4.53
10.09
2.05
1..57
6.52
1
6
4.63
10.10
2.04
1.56
6.54
1
6
4.73
10.10
2.03
1.55
6.56
1
7
4.73
10.10
2.03
1.55
6.56
i
7
4.83
10.10
2.02
1.54
6.58
1
7
4.93
10.09
2.01.
1.54
6.60
1
7
5.03
10.09
2.01
1.53
6.62
1
7
5.13
10.08
2.00
1.52
6.64
1
7
5.23
10.07
1.99
1.51
6.66
1.
7
5.33
10.06
1.98
1.50
6.68
1
7
5.43
10.06
1.97
1.49
6.70
1
7
5.53
10.05
1..96
1.48
6.72
1
7
5.63
10.05
1.95
1.47
6.74
1
7
5.73
10.04
1.94
1.46
6.76
1
7
5.83
10.04
1.94
1.46
6.79
1.
7
5.93
10.04
1.93
1.45
6.80
1
7
6.03
10.03
1.92
1..44
6.82
1
7
6.1.3
10.03
1.91.
1..43
6.84
1
7
6.23
10.03
1.90
1.42
6.86
1
7
6.33
10.02
1.89
1.41
6.88
1
7
6.43
10.02
1.89
1.41
6.90
1
7
6.53
10.02
1.88
1.40
6.92
Seg #
I Reach 4#
I Seg MS
I D.O. I
CBOD I
NBOD I
Flow

WINTER
LIMITS HEALTH SERVICES GAVE
15 MG/L BOD5 ADDED 11 MG/L NH3
MODEL RESULTS
Discharger
:
WILLOW CREEM. BUILDERS.
INC.
Receiving Stream :
----------------------------------------------------------------------
ABBOTTS CREEK
The End
D.Q.
is 10.02
mg/l.
The End
CBOD
is 1.87
mg/l.
The End
---------------------------------------------------------------------------------
NBOD
is 1.45
mg/l.
WLA
WLA
WLA
DO Min
CBOD
NBOD
DO
Waste Flow
(mg/1)
Milepoint Reach #
(mg/1)
(mg/1)
(mg/1)
(mad)
Segment
1.
8.94
0.00 1
Reach
1
22.50
49.50
0.00
0.08000
Reach
2
45.00
90.00
0.00
0.00060
Reach
3
45.00
90.00
0.00
0.00060
Reach
4
45.00
90.00
0.00
0.00060
Reach
5
0.00
0.00
0.00
0.00000
Reach
6
0.00
0.00
0.00
0.00000
Reach
7
0.00
0.00
0.00
0.00000

---------- MODEL RESULTS --
Discharger : WILLOW CREEK. BUILDERS, INC.
Receiving Stream : ABBOTTS CREEK.
----------------------------------------------------------
The End D.O. is 7.82 ma/l.
The End CBOD is 1.28 mg/l.
The End NBOD is 0.67 mg/l.
Segment 1
Reach 1
Reach 2
Reach 3
Reach 4
Reach 5
Reach 6
Reach 7
DO Mi.n
(mg/1) Milepoint Reach #
7.26 0.00 1
WLA
CBOD
13.50
45.00
45.00
45.00
0.00
0.O0
0.00
SUMMER
LIMITS FROM HEALTH SERVICES
9 BODS, 5.5NH3N, & 5 DO
-------------------
WLA
WLA
NBOD
DO
Waste Flow
(mg/1)
(mg/1)
(mgd)
24.75
5.00
0.08000
90.00
0.00
0.00060
90.00
O.00
0.00060
90.00
0.00
O.O0060
0.00
0.00
0.00000
0.00
0.00
0.00000
0.00
0.00
0.00000

WINTER
LIMITS HEALTH SERVICES GAVE
15 MG/L NODS
---------- MODEL RESULTS --
Discharger : WILLOW CREEP: BUILDERS, INC.
Receiving Stream : ABBOTTS CREEK
The End D.O. is 9.98 mg/l.
The End CBOD is 1.87 mg/l.
The End NBOD is 1.96 mg/l.
------------------------------------------------------
Segment 1
Reach 1
Beach 2
Reach
Reach 4
Reach 5
Reach 6
Reach 7
WLA
DO Min
CDOD
(mg/1) Milepoint Reach #
(mg/1)
8.94 0.00 1.
22.50
45.00
45.00
45.00
0.00
0.00
0.00
WLA
NBOD
(mg/1)
90.00
90.00
90.00
90.00
0.00
0.00
0.00
WLA
DO
Waste Flow
(mg/1)
(mgd)
0.00
0.0800(.)
0.00
0.00060
0.00
0.00060
0.00
0.00060
0.00
0.00000
0.00
0.00000
0.00
0.00000
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1j11��J�
North Carolina Department of Human Resources
Division of Health Services
P.O. Box 2091 a Raleigh, North Carolina 27602-2091
James G. Martin, Governor
David T. Flaherty, Secretary
April 17, 1989
Mr. M. Dale Overcash, P.E.
NPDES Permits Group Leader
Discharge Permits Unit
Division of Environmental Management
Department of NRCD
P. 0. Box 27680
Raleigh, NC 27611
Dear Mr. Overcash:
Ronald H. Levine, M.D., M.P.H.
State Health Director
Re: Draft NPDES Permit
Willow Creek Builder, Inc.
Dorado Circle
Davidson County
Permit No. NC034452
PWSB No. 280
We have consulted with the owners and their engineer regarding the referenced
project. Based on those discussions we will concur in the issuance of this
permit for a maximum discharge of 80,000 gpd with the following changes in
effluent limitations:
1. The B 0 D (5 day) limit for summer months is 9 mg/i on a monthly
average with 13.5 mg/1 maximum weekly average.
2. The B 0 D (5 day) limit for winter -months is 15 mg/l on a monthly
average with 22.5 mg/1 maximum weekly average.
3. The NH as N limit for summer months is 5.5 mg/l on a monthly average
with 8,25 mg/l maximum weekly average.
Also our concurrence to permit issuance is given only if the owner of
the treatment facility agrees to abandon this facility and discharge wastewater
to a regional wastewater collection -treatment system within 6 months of availability.
We have some concerns with discharge of nutrients to the receiving stream
and if this permit is requested to be renewed we will be addressing that issue
if we see it as a problem at that time.

Mr. M.Dale Overcash, P.E.
Page 2
April 17, 1989
If we can be of further assistance, please call us.
Sincerely,
Richard K. Rowe, Chief
Environmental Health Section
RKR/WEV/ar
cc: E. P. Cain, Regional Engineer