NC0087645_Speculative Limits_20020410

State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
Micheal F. Easley, Governor
William G. Ross, Jr., Secretary
Gregory J. Thorpe, Ph.D., Acting Director
April 10, 2002
Mayor Walter L. Thomas, IV
Town of Milton
P.O. Box 85
Milton, North Carolina 27305
NCDENR
ICJDV0 yS
Subject: Speculative Limits for Milton WWTP
Caswell County
Dear Mayor Thomas:
This letter is in response to the request for speculative effluent limits for the proposed
Town of Milton WWTP. A wastewater flow of 0.050 was targeted for discharge into Country
Line Creek in the Roanoke River Basin. Please note that Country Line Creek eventually flows
into the Dan River located in the Commonwealth of Virginia. This permit will be subject to
review and scrutiny by that State, as well as the U.S. Environmental Protection Agency. The
staff of the NPDES Unit of the Point Source Branch has reviewed this request and will provide
speculative effluent limits
Please be advised that response to this request does not guarantee that the Division will
issue an NPDES permit to discharge treated wastewater into these receiving waters. The Town
of Milton will be required to complete an Engineering Alternatives Analysis (EAA) that must be
submitted with the application for the NPDES permit. The EAA should contain a clear and
strong justification for the proposed facility and an analysis of potential alternatives, which
should include a thorough evaluation of non -discharge alternatives. Nondischarge alternatives,
such as spray irrigation, water conservation, or connection to a regional treatment and disposal
system, are considered to be environmentally preferable to a surface water discharge. In
accordance with the North Carolina General Statutes, the practicable waste treatment and
disposal alternative with the least adverse impact on environment is required to be implemented.
This segment of the Country Line Creek has a stream classification of C. The best usage
of these waters is as a source of water supply for drinking, culinary, or food processing. Using
information available at this time, the discharge point has an estimated drainage area of 137.5
square miles, with an average flow of 124 cfs, a summer 7Q10 of 0.73 cfs and a winter 7Q10 of
6.2 cfs. Please be advised that these flows were estimated by DWQ, however it is preferable that
1617 Mail Service Center, Raleigh, North Carolina 27699-1617 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer Internet: http://h2o.enr.state.nc.us/

Milton WWTP Speculative Limits
Page 2
preferable that the Town request actual flow estimations from the United States Geological
Survey to ensure accuracy.
Based on available information, the tentative effluent limits for oxygen -consuming
constituents of the Milton WWTP discharge at the flow of 0.05 MGD are included on the
attached effluent sheet. Please note that the recommended summer NH3 limit of 5.9 mg/l is
based on protection against ammonia toxicity. Upon formal permit application, if there is an
industrial wastewater constituency, an evaluation of limits and monitoring requirements for
metals and other toxicants will be addressed at that time.
The Division of Water Quality is requiring chlorine limits for all new or expanding
dischargers proposing the use of chlorine for disinfection. The process of
chlorination/dechlorination or an alternate form of disinfection, such as ultraviolet radiation,
should allow the facility to comply this requirement.
Final NPDES effluent limitations will be determined after a permit application has been
submitted to the Division. If there are any additional questions concerning this matter, please
feel free to contact Jackie Nowell of my staff at [phone] ext. 512.
Respectfully,
David A. Goodrich
NPDES Unit Supervisor
Attachment
cc: Winston-Salem Regional Office/Larry Coble
Bobby Blowe, Construction Grants
Central Files
M NPDES Permit File

Milton WWTP Speculative Limits
Page 3
A. SPECULATIVE EFFLUENT LIMITATIONS AND MONITORING
REQUIREMENTS - MILTON WWTP
During the period beginning on the effective date of the permit and lasting until expiration, the
Permittee is authorized to discharge from outfall 001. Such discharges shall be limited and
monitored by the Permittee as specified below:
EFFLUENT
LIMITS -
MONITORING REQUIREMENTS
CHARACTERISTICS
Monthly
Weekly
Daily
Measurement.
Sample
Sample Location'
Average
Average
Maximum
Fre uenc
Type
Flow
0.050 MGD
Continuous
Recording
Influent or Effluent
BOD, 5-day, 209C2
30.0 mg/L
45.0 mg/L
Weekly
Composite
Influent, Effluent
Total Suspended Residue 2
30.0 mg/L
45.0 mg/L
Weekly
Composite
Influent, Effluent
NH3 as N (April 1— October
5.9 mg/L
2/Month
Composite
Effluent
31
NH3 as N (November 1 —
2/Month
Composite
Effluent
March 30
Fecal Coliform
200 / 100 ml
400 / 100 ml
Weekly
Grab
Effluent
(geometric mean
H3
Weekly
Grab
Effluent
Total Residual Chlorine
28 p g/L
9/Week
Grab
Effluent
Total Nitrogen
Semi-annually
Composite
Effluent
(NO2+NO3+TKN)
Total Phosphorus
Semi-annually
L Composite
Effluent
Temperature, QC
Weekly
Grab
Effluent
Notes:
1. Influent. Effluent
2. The monthly average effluent BOD5 and Total Suspended Residue concentrations shall not exceed
15% of the respective influent value (85% removal).
3. The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
4. Monitoring requirement and limit applies only if chlorine is added for disinfection.
There shall be no discharge of floating solids or visible foam in other than trace

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MODEL INPUTS FOR LEVEL B ANALYSIS
GENERAL INFORMATION
Facility Name: Mi
NPDES No.:
Type of Waste: d,),"g c
Facility Status: aJtck
Receiving Stream: PJAGmL CIUA
Stream Classification: LIC
Subbasin: 0 3 v zd,/
County:
Regional Office:
Topo Quad: /a ZZ SW
FLOW INFORMATION
USGS#
Date of Flow Estimates:
Drainage Area (mi2):
Summer 7Q10 (cfs): 6.73
Winter 7Q10 (cfs): , y
Average Flow (cfs): 23, S
30Q2 (cfs): 7,3
1WC at Point of Discharge M:
Cummulative IWC (%):
M.
MODEL INPUT INFORMATION
LENGTH OF REACH (miles)
1,3#,i
o,3
Q,(y
INCREMENTAL LENGTH (miles)
D.
0 , 0 3
6b
WASTE CHARACTERISTICS
FLOW (MGD)
oSiU
—
CBOD (mg/1)
—
NBOD (mg/1)
_
D.O. (mg/1)
_
RUNOFF CHARACTERISTICS
7Q10 (cfs/mil)
D
_
QA (cfs/mil)
O
_
CBOD (mg/1)
Z
_
NBOD (mg/1)
t
D.O. (mg/1)
_
TRIBUTARY CHARACTERISTICS
7Q10 (cfs)
_
7
QA (cfs)
—
ZtSo
CBOD (mg/1)
—
NBOD (mg/1)
_
D.O. (mg/1)
_
V
SLOPE (fpm)
Name of facility

H r L- N u1 1
360
I
3`Q
Stre4 M
�SIO C Colcu 1 tLtiO n S
e3 0 14_3.7
;2, 7 i 0
3 1O
Z
,
i
to rh
e e.v
41 st'
dust
�0
0
3 `fi 7 Q,
distance
I

proposed Milton WWTP
Residual Chlorine
Ammonia as NI.13
(summer)
7Q10 (CFS)
0.73
7Q10 (CFS)
0.73
DESIGN FLOW (MGD)
0.05
DESIGN FLOW (MGD)
0.05
DESIGN FLOW (CFS)
0.0775
DESIGN FLOW (CFS)
0.0775
STREAM STD (UG/L)
17.0
STREAM STD (MG/L)
1.0
UPS BACKGROUND LEVEL (U
0
UPS BACKGROUND LEVEL
0.48
IWC (%)
9.60
IWC (%)
9.60
Allowable Concentration (ug/
177.13
Allowable Concentration (m
5.90
Ammonia as NH3
(winter)
7Q10 (CFS)
6.19
Fecal Limit
2001100ml
DESIGN FLOW (MGD)
0.05
Ratio of 9.4 :1
DESIGN FLOW (CFS)
0.0775
STREAM STD (MG/L)
1.8
UPS BACKGROUND LEVEL
0.22
IWC (%)
1.24
Allowable Concentration (m
128.00
3114102

SUMMER
MODEL FOR PROP. MILTON WWTP
'
BOD5=30, NH3=5.9 FOR
TOXICITY
---------- MODEL RESULTS ----------
Discharger
:
TOWN OF MILTON
Receiving Stream :
COUNTRY LINE CREEK
----------------------------------------------------------------------
The End D.O.
is 7.46
mg/l.
The End CBOD
is 1.97
mg/l.
The End NBOD
----------------------------------------------------------------------
is 0.97
mg/l.
WLA WLA
WLA
DO Min
CBOD NBOD
DO
Waste Flow
(mg/1)
Milepoint Reach #
(mg/1) (mg/1)
(mg/1)
(mgd)
Segment 1
------
5.30
----------------
1.90 2
---- ----
--
----------
Reach 1
45.00 26.55
0.00
0.05000
Reach 2
0.00 0.00
0.00
0.00000
Reach 3
0.00 0.00
0.00
0.00000

*** MODEL SUMMARY DATA ***
Discharger : TOWN OF MILTON
Receiving Stream : COUNTRY LINE CREEK
Summer 7Q10 : 0.7
Design Temperature: 25.0
Subbasin : 030204
Stream Class: C
Winter 7Q10 6.2
LENGTH
SLOPE
VELOCITY
DEPTH
Kd
Kd
Ka
Ka
KN
------------
mile
-------------------------------------------------------------------
ft/mi
fps
I ft
design I
@200
I design I
@200
I design
Segment
1
1.30
3.70
0.100
0.73
0.27
0.22
0.74
0.67
0.44
Reach
--------------------------------------------------------------------------------
1
Segment
1
0.60
1.80
0.100
0.73
0.27
0.21
0.36
0.32
0.44
Reach
--------------------------------------------------------------------------------
2
Segment
1
1 1.00
1.80
0.910
1 5.70
1 0.27 1
0.22
1 1.61 1
1.44
0.44
Reach 3
t
Flow
CBOD
NBOD
D.O.
c f s
mg/1
mg/1
mg/1
Segment 1
Reach 1
Waste
0.077
45.000
26.550
0.000
Headwaters
0.730
2.000
1.000
7.440
Tributary
0.000
2.000
1.000
7.440
* Runoff
0.000
2.000
1.000
7.440
Segment 1
Reach 2
Waste
0.000
0.000
0.000
0.000
Tributary
0.000
2.000
1.000
7.440
* Runoff
0.000
2.000
1.000
7.440
Segment 1
Reach 3
Waste
0.000
0.000
0.000
0.000
Tributary
442.000
2.000
1.000
7.440
* Runoff
0.000
2.000
1.000
7.440
* Runoff flow is in cfs/mile

.r
SUMMER
MODEL FOR PROP. MILTON WWTP
BOD5=30,
NH3=5.9 FOR TOXICITY
Seg #
Reach #
( Seg Mi (
D.O. (
CBOD
NBOD (
Flow
1
1
0.00
6.73
6.13
3.45
0.81
1
1
0.10
6.61
6.03
3.36
0.81
1
1
0.20
6.49
5.93
3.27
0.81
1
1
0.30
6.39
5.83
3.18
0.81
1
1
0.40
6.30
5.73
3.10
0.81
1
1
0.50
6.21
5.64
3.02
0.81
1
1
0.60
6.13
5.54
2.94
0.81
1
1
0.70
6.06
5.45
2.86
0.81
1
1
0.80
6.00
5.36
2.78
0.81
1
1
0.90
5.94
5.27
2.71
0.81
1
1
1.00
5.88
5.18
2:64
0.81
1
1
1.10
5.84
5.10
2.57
0.81
1
1
1.20
5.80
5.01
2.50
0.81
1
1
1.30
5.76
4.93
2.43
0.81
1
2
1.30
5.76
4.93
2.43
0.81
1
2
1.36
5.70
4.88
2.39
0.81
1
2
1.42
5.65
4.83
2.35
0.81
1
2
1.48
5.60
4.79
2.32
0.81
1
2
1.54
5.55
4.74
2.28
0.81
1
2
1.60
5.51
4.69
2.24
0.81
1
2
1.66
5.46
4.65
2.21
0.81
1
2
1.72
5.42
4.60
2.17
0.81
1
2
1.78
5.38
4.56
2.14
0.81
1
2
1.84
5.34
4.51
2.10
0.81
1
2
1.90
5.30
4.47
2.07
0.81
1
3
1.90
7.44
2.00
1.00
442.81
1
3
2.00
7.44
2.00
1.00
442.81
1
3
2.10
7.44
2.00
1.00
442.81
1
3
2.20
7.44
1.99
0.99
442.81
1
3
2.30
7.45
1.99
0.99
442.81
1
3
2.40
7.45
1.99
0.99
442.81
1
3
2.50
7.45
1.98
0.98
442.81
1
3
2.60
7.45
1.98
0.98
442.81
1
3
2.70
7.45
1.98
0.98
442.81
1
3
2.80
7.46
1.97
0.98
442.81
1
3
2.90
7.46
1.97
0.97
442.81
Seg #
Reach #
Seg Mi
D.O.
CBOD
NBOD
Flow

WINTER
MODEL
FOR PROP. MILTON WWTP
'
30/30
LIMITS
PROTECT
---------- MODEL RESULTS ----------
Discharger
:
TOWN'OF MILTON
Receiving Stream :
COUNTRY LINE CREEK
----------------------------------------------------------------------
The End D.O.
is 9.34
mg/l.
The End CBOD
is 1.99
mg/l.
The End NBOD
----------------------------------------------------------------------
is 1.00
mg/l.
WLA
WLA
WLA
DO Min
CBOD
NBOD
DO
Waste Flow
(mg/1)
Milepoint Reach #
(mg/1)
(mg/1)
(mg/1)
(mgd)
Segment 1
------
6.91
----------------
1.90 2
----
----
--
----------
Reach 1
45.00
90.00
0.00
0.05000
Reach 2
0.00
0.00
0.00
0.00000
Reach 3
0.00
0.00
0.00
0.00000

*** MODEL SUMMARY DATA ***
Discharger
:
TOWN OF
MILTON
Subbasin
030204
Receiving Stream
:
COUNTRY
LINE CREEK
Stream
Class:
C
Summer 7Q10
:
0.7
Winter
7Q10 :
6.2
Design Temperature:
14.0
LENGTH
SLOPE
VELOCITY
DEPTH
Kd
Kd
Ka
Ka
KN
------------
mile
-------------------------------------------------------------------
ft/mi
fps I
ft
design I
@200 I
design I
@200
I design
Segment 1
1.30
3.70
0.100
0.73
0.16
0.22
0.58
0.67
0.19
Reach 1
--------------------------------------------------------------------------------
Segment 1
0.60
1.80
0.100
0.73
0.16
0.21
0.28
0.32
0.19
Reach 2
--------------------------------------------------------------------------------
Segment 1
1 1.00
1.80
1.332 1
6.07 1
0.17 1
0.22 1
1.85 1
2.11
0.19
Reach 3
T
Flow
CBOD
NBOD
D.O.
cfs
mg/l
mg/1
mg/1
Segment 1
Reach 1
Waste
0.077
45.000
90.000
0.000
Headwaters
0.730
2.000
1.000
9.280
Tributary
0.000
2.000
1.000
9.280
* Runoff
0.000
2.000
1.000
9.280
Segment 1
Reach 2
Waste
0.000
0.000
0.000
0.000
Tributary
0.000
2.000
1.000
9.280
* Runoff
0.000
2.000
1.000
9.280
Segment 1
Reach 3
Waste
0.000
0.000
0.000
0.000
Tributary
736.000
2.000
1.000
9.280
* Runoff
0.000
2.000
1.000
9.280
* Runoff flow is in cfs/mile

WINTER
MODEL
FOR PROP. MILTON WWTP
30/30
LIMITS PROTECT
Seg #
Reach #
Seg Mi
D.O. (
CBOD
NBOD
( Flow
1
1
0.00
8.39
6.13
9.54
0.81
1
1
0.10
8.29
6.07
9.43
0.81
1
1
0.20
8.19
6.00
9.32
0.81
1
1
0.30
8.10
5.94
9.22
0.81
1
1
0.40
8.02
5.88
9.11
0.81
1
1
0.50
7.94
5.83
9.01
0.81
1
1
0.60
7.86
5.77
8.90
0.81
1
1
0.70
7.79
5.71
8.80
0.81
1
1
0.80
7.72
5.65
8.70
0.81
1
1
0.90
7.66
5.60
8.60
0.81
1
1
1.00
7-.60
5.54
8.50
0.81
1
1
1.10
7.55
5.48
8.40
0.81
1
1
1.20
7.49
5.43
8.31
0.81
1
1
1.30
7.45
5.37
8.21
0.81
1
2
1.30
7.45
5.37
8.21
0.81
1
2
1.36
7.39
5.34
8.15
0.81
1
2
1.42
7.33
5.31
8.10
0.81
1
2
1.48
7.27
5.28
8.04
0.81
1
2
1.54
7.22
5.25
7.99
0.81
1
2
1.60
7.17
5.22
7.93
0.81
1
2
1.66
7.11
5.19
7.88
0.81
1
2
1.72
7.06
5.16
7.82
0.81
1
2
1.78
7.01
5.12
7.77
0.81
1
2
1.84
6.96
5.09
7.71
0.81
1
2
1.90
6.91
5.06
7.66
0.81
1
3
1.90
9.28
2.00
1.01
736.81
1
3
2.00
9.28
2.00
1.01
736.81
1
3
2.10
9.29
2.00
1.01
736.81
1
3
2.20
9.30
2.00
1.00
736.81
1
3
2.30
9.30
2.00
1.00
736.81
1
3
2.40
9.31
2.00
1.00
736.81
1
3
2.50
9.31
1.99
1.00
736.81
1
3
2.60
9.32
1.99
1.00
736.81
1
3
2.70
9.33
1.99
1.00
736.81
1
3
2.80
9.33
1.99
1.00
736.81
1
3
2.90
9.34
1.99
1.00
736.81
Seg #
Reach #
Seg Mi (
D.O.
CBOD
NBOD
Flow

/Voiw//
TOWN OF MILTON
P.O. BOX 85
MILTON, NORTH CAROLINA 27305
October 27, 2001
Mr. Dave Goodrich, P.E.
NC Division of Water Quality
1617 Mail Service Center
Raleigh, NC 27699-1617
Re: Town of Milton
Speculative Limits Request
C&A No.: MT9901
Dear Mr. Goodrich:
On behalf of the Town of Milton, I am submitting a request for speculative
discharge limits for 8 potential wastewater discharge into Country Line Creek.
The discharge point would be located upstream of the convergence with Doll
Branch. Please see the enclosed map.
This new wastewater collection and treatment system would serve the Town of
Milton, population 236. The customers will be residential and small business.
The dicharge will be from a constructed wetlands wastewater treatment facility
with a design capacity of 50 000 g nns nar ring.
Country Line Creek flows into the Dan:River approximately 2 miles downstream
from the proposed discharge point. To our knowledge there are no other
discharges to Country Line Creek.
The Town of Milton appreciates your assistance with this and if you have any
questions, please contact Lisa Alley with Cavanaugh & Associates, P.A. at
336-759-9001.
Sincerely,
/XW
Walter L. Thomas, IV
Mayor
WLT:lar
Enclosure

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Milton
Subject: Milton
Date: Thu, 27 Dec 2001 09:06:48 -0500
From: "Lisa Alley" <[e-mail]>
To: "Jackie Nowell" <[e-mail]>
Hi Jackie,
I hope you're having a nice holiday season. Mine has passed by too fast.
I spoke to Curtis Weaver at USGS and the 7Q10 he gave me for Country Line Creek is 0.7 cfs. He is supposed to
be sending me a copy of the report they prepared recently. When I receive it, I'll send a copy of the information to
you.
Lisa Alley, P.E.
Cavanaugh & Associates, P.A.
8064 North Point Boulevard, Suite 102
Winston-Salem, North Carolina 27106
ph. 336-759-9001
fax [phone]
e-mail: [e-mail]
1 of 1 1/7/02 10:12 AM

February 25, 2002
Ms. Jackie Nowell
NC Division of Water Quality
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
Re: Town of Milton
Speculative Limits Request
C&A No.: MT9901
Dear Jackie:
CAVANAU G H
Suiutrum dumigi� intuglu) any pwu)"Slup
u1l iii'I�
FEB 2 6 .2002 ...
Enclosed is a copy of the Low -Flow characteristics report for the Roanoke River Basin
which includes the information regarding Country Line Creek that you requested. I
hope this information will help you complete the speculative limits for the Town of
Milton's wastewater treatment facility. If you need additional information, please give
me a call at 336/759-9001 or e-mail me at Ially0cavanauahsolutions.com. Thanks for
your help.
Sincerely,
CAVANAUGH &&`ASSOCIATES, P.A.
DjssaaAlley P.E.
Enclosure
cc: Mayor Walter Lea Thomas, IV, Town of Milton

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