NC0006033_Wasteload Allocation_20070320

IWC Calculations
Town of Cramerton WWTP
NC0006033
Prepared By: Agyeman Adu-Poku, NPDES Unit
Enter Design Flow (MGD): 4
Enter s7Q10(cfs): 125
Enter w7Q10 (cfs): 230
Residual Chlorine
lll�iW%f/6�
Ammonia (NH3 as N)
(summer)
7Q10 (CFS)
125
7Q10 (CFS)
125
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 (l
0
UPS BACKGROUND LEVEL
0.22
IWC (%)
4.73
IWC (%)
4.73
Allowable Conc. (ugll)
360
Allowable Conc. (mg/1)
16.7
Ammonia (NH3 as N)
(winter)
7Q10 (CFS)
230
Fecal Limit
2001100ml
DESIGN FLOW (MGD)
4
(If DF >331; Monitor)
DESIGN FLOW (CFS)
6.2
(If DF <331; Limit)
STREAM STD (MG/L)
1.8
Dilution Factor (DF)
21.16
UPS BACKGROUND LEVEL
0.22
IWC (%)
2.62
Allowable Conc. (mg/1)
60.4
Rule of tumb never give small facility <2 ug/L of NH3
NPDES Servor/Current Versions/IWC
312012007

March 7, 2007
To: Agyeman Adu-poku
From: Bob Sledge 1 b
Subject: Request for Level B Model
Town of Cramerton WWTP
NPDES Permit NC0006033
SOC WQ S05-010, Ad I
The Town of Cramerton has requested an amendment to its current SOC, asking for an extension
of time for completion of a construction project, and for the addition of two relaxed parameters.
One, BOD, is an oxygen consuming waste.
Currently the permit limits for BOD are:
Monthly Average Weekly Average
10.0 mg/L 15.0 mg/L
The draft SOC calls for a monthly average of 30.0 mg/L with no weekly average limitation.
The design flow of the facility is 4.0 MGD, as is its permit flow limit. Currently, the facility's
discharge averages 0.84451 MGD, or 21.1 % of capacity. Discharge is into the South Fork
Catawba River, WS-V waters of the State.
Within the SOC the Town has asked for a flow allocation of 0.54252 MGD to allow for
reasonable growth during the life of the SOC.
This construction project is underway. It is believed that on -site construction has disturbed some
treatment efficiencies, thus prompting the SOC amendment. As drafted, the amendment would
simply extend the final compliance date by 4 months, to July 31, 2007.
Please see me if I can answer any questions.

MODEL INPUTS FOR LEVEL B ANALYSIS
GENERAL INFORMATION
Facility Name:
aWn (2 e�
NPDES No:
oc000 GL)-Z3
Type of Waste:
Z>�,� C
''�.
Facility Status:
Receiving Stream:
Sv
Stream Classification:
W
Subbasin:
County:
Regional Office:
m '
Topo Quad:
CA E
FLOW INFORMATION
USGS#
Date of Flow Estimates:
Drainage Area (mi2):
>
Summer 7Q10 (cfs):
Winter 7Q10 (cfs):
3 p
Average Flow (cfs):
!
30Q2 (cfs):
IWC at Point of Discharge (%):
, �►
Cummulativi � IWC (%)
bKODEL-INrUT INFORMATION
f:ENGTH OF REACH (miles)
INCREMENTAL LENGTH (nuIes)'
WASTE 0iARACTEkISTICS
FLOW (MGD)
CBOD (mg/1)
NBOD (mg/1)
D.O. (mg/1)
RUNOFF CHARACTERISTICS
7Q10 (cfs/mil)
QA (cfs/mi2)
CBOD (mg/1)
NBOD (mg/1)
D.O. (mg/1)
TRIBUTARY CHARACTERISTICS
7Q10 (cfs)
QA (cfs)
CBOD (mg/1)
NBOD (mg/1)
D.O. (mg/1)
[SLOPE (fpm)
Name of facility

; -� ", 0,
t:x - I�A 1�6
*** MODEL SUMMARY DATA ***
Discharger :
TOWN OF
CRAMERTON
Subbasin :
03836
Receiving Stream :
SOUTH FORK CATAWBA
RIVER
Stream Class:
WS-V
Summer 7Q10 :
125.0
Winter
7Q10
: 230.0
Design Temperature:
23.0
LENGTH
SLOPE
VELOCITY
DEPTH
Kd
Kd
Ka Ka
KN
mile
------------ -------------------------------------------------------------------
ft/mi
fps I
ft
designI
@200
design @200 I
I I
design
Segment 1
1 1.30
5.00
0.718 1
3.43
1 0.27 1
0.23
1 3.37
1 3.16
0.38
Reach 1
t
Flow
CBOD
NBOD
cfs
mg/l
mg/1
Segment 1
Reach 1
Waste
2.139
45.000
18.000
Headwaters
125.000
2.000
1.000
Tributary
0.000
2.000
1.000
* Runoff
0.000
2.000
1.000
* Runoff flow is in cfs/mile
D.O.
mg/1
0.000
7.720
7.720
7.720

SUMMER
MODEL RESULTS
Discharger
:
TOWN OF CRAMERTON
Receiving Stream :
SOUTH FORK CATAWBA
RIVER
----------------------------------------------------------------------
The End D.O.
is 7.84
mg/l.
The End CBOD
is 2.07
mg/l.
The End NBOD
----------------------------------------------------------------------
is 1.13
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
------
7.64
----------------
0.00 1
----
----
-- ----------
Reach 1
15.00
18.00
0.00 0.84000

1
SUMMER
Seg #
Reach #
Seg Mi
D.O.
CBOD
NBOD
Flow
1
1
0.00
7.64
2.13
1.18
126.30
1
1
0.10
7.66
2.13
1.17
126.30
1
1
0.20
7.68
2.12
1.17
126.30
1
1
0.30
7.69
2.12
1.16
126.30
1
1
0.40
7.71
2.11
1.16
126.30
1
1
0.50
7.73
2.11
1.16
126.30
1
1
0.60
7.74
2.11
1.15
126.30
1
1
0.70
7.76
2.10
1.15
126.30
1
1
0.80
7.77
2.10
1.15
126.30
1
1
0.90
7.79
2.09
1.14
126.30
1
1
1.00
7.80
2.09
1.14
126.30
1
1
1.10
7.81
2.08
1.13
126.30
1
1
1.20
7.83
2.08
1.13
126.30
1
1
1.30
7.84
2.07
1.13
126.30
Seg #
Reach #
Seg Mi
D.O.
CBOD
NBOD
Flow

pd�+�,� f�ow
*** MODEL SUMMARY DATA ***
Discharger : TOWN OF CRAMERTON Subbasin : 03836
Receiving Stream : SOUTH FORK CATAWBA RIVER Stream Class: WS-V
Summer 7Q10 : 125.0 Winter 7Q10 : 230.0
Design Temperature: 23.0
LENGTH SLOPEJ VELOCITY I DEPTH Kd I Kd I Ka I Ka I KN
mile ft/mi fps ft design @200 design @200 design
------------ -------------------------------------------------------------------
Segment 1 1 1.30 5.00 0.715 1 3.43 1 0.27 1 0.23 1 3.36 1 3.15 0.38
Reach 1
t
Flow
CBOD
cfs
mg/1
Segment 1
Reach 1
Waste
1.302
15.000
Headwaters
125.000
2.000
Tributary
0.000
2.000
* Runoff
0.000
2.000
* Runoff flow is in cfs/mile
NBOD
D.O.
mg/1
mg/1
18.000
0.000
1.000
7.720
1.000
7.720
1.000
7.720

t
SUMMER
MODEL RESULTS
Discharger
:
TOWN OF CRAMERTON
Receiving Stream :
SOUTH FORK CATAWBA
RIVER
----------------------------------------------------------------------
The End D.O.
is 7.79
mg/l.
The End CBOD
is 2.64
mg/l.
The End NBOD
----------------------------------------------------------------------
is 1.23
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
7.59
0.00 1
Reach 1
45.00
18.00
0.00 1.38000

r
SUMMER
Seg #
Reach #
Seg Mi
D.O.
CBOD
NBOD
Flow
1
1
0.00
7.59
2.72
1.29
127.14
1
1
0.10
7.61
2.72
1.28
127.14
1
1
0.20
7.63
2.71
1.28
127.14
1
1
0.30
7.64
2.71
1.27
127.14
1
1
0.40
7.66
2.70
1.27
127.14
1
1
0.50
7.67
2.69
1.27
127.14
1
1
0.60
7.69
2.69
1.26
127.14
1
1
0.70
7.71
2.68
1.26
127.14
1
1
0.80
7.72
2.67
1.25
127.14
1
1
0.90
7.73
2.67
1.25
127.14
1
1
1.00
7.75
2.66
1.25
127.14
1
1
1.10
7.76
2.66
1.24
127.14
1
1
1.20
7.78
2.65
1.24
127.14
1
1
1.30
7.79
2.64
1.23
127.14
Seg #
Reach #
Seg Mi
D.O.
CBOD
NBOD
Flow

A-G,PJ(naJ q0%/
*** MODEL SUMMARY DATA ***
Discharger :
TOWN OF
CRAMERTON
Subbasin :
03836
Receiving Stream :
SOUTH FORK CATAWBA
RIVER
Stream Class:
WS-V
Summer 7Q10 :
125.0
Winter
7Q10
: 230.0
Design Temperature:
7.0
LENGnil
SLOPEI
VELOCITY
DEPTH
Kd
Kd
Ka Ka
KN
------------
mile
-------------------------------------------------------------------
I ft/mij
fps I
ft
design I
@200
I design Q20°
I I
design
Segment 1
1 1.30
5.00
1.128 1
3.70 1
0.14 1
0.25
1 3.74
1 4.96
0.11
Reach 1
z
Flow
cfs
Segment 1
Reach 1
Waste
2.139
Headwaters
230.000
Tributary
0.000
* Runoff
0.000
Mg/1I �J/D NBOI m3/1
45.000
18.000
0.000
2.000
1.000
10.930
2.000
1.000
10.930
2.000
1.000
10.930
* Runoff flow is in cfs/mile

WINTER
MODEL RESULTS
Discharger
:
TOWN OF CRAMERTON
Receiving Stream :
SOUTH FORK CATAWBA RIVER
----------------------------------------------------------------------
The End D.O.
is 11.10
mg/l.
The End CBOD
is 2.37
mg/l.
The End NBOD
----------------------------------------------------------------------
is 1.15
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
------
10.83
----------------
0.00 1
----
----
-- ----------
Reach 1
45.00
18.00
0.00 1.38000

0
WINTER
v
Seg #
Reach #
f Seg Mi
D.O.
CBOD
NBOD
Flow
1
0.00
10.83
2.40
1.16
232.14
1
1
0.10
10.85
2.39
1.16
232.14
1
1
0.20
10.88
2.39
1.16
232.14
1
1
0.30
10.90
2.39
1.15
232.14
1
1
0.40
10.92
2.39
1.15
232.14
1
1
0.50
10.94
2.39
1.15
232.14
1
1
0.60
10.97
2.39
1.15
232.14
1
1
0.70
10.99
2.38
1.15
232.14
1
1
0.80
11.01
2.38
1.15
232.14
1
1
0.90
11.03
2.38
1.15
232.14
1
1
1.00
11.05
2.38
1.15
232.14
1
1
1.10
11.07
2.38
1.15
232.14
1
1
1.20
11.09
2.38
1.15
232.14
1
1
1.30
11.10
2.37
1.15
232.14
Seg #
Reach #
Seg Mi
D.O.
CBOD
NBOD
Flow