NC0021326_wasteload allocation_19871027

PERMIT NO.: Ncoo Z 132 NPDES WASTE LOAD ALLOCATION
�
FACILITY NAME: TbWN OF 7.c i,;,
Facility Status: PRE
(circle one)
Permit Statu- RENEWAL, MODMCAMON UNPERMnTED NEW
(circle one)----
Major _ M nor
Pipe No: cc/
Deslgn ,Capacity (MGD):
Domestic (% of Flow): _ 1 C: Z:>
Indastrial (X of Flow):
Comments:
RECEIVING STREAM: CodY (4= K _
Class: C
Sub -Basin: 0 3 — 0-7 - C� Z
Reference USGS Quad: �(please attach)
County: '[ate C E
Regional Office: As Fa Mo Ra Wa Wi
kireli *■ej
Requested By: SLAnuC L .Pf = c-,Y Date:
Prepared By: Date:
Reviewed By: � Date: o �7
l /z, 7 4�x9_
Modeler
Date Rec.
s
4 t_t $�1
Drainage Area (mis) Avg. Streamflow (cfs)• _ L [-,
7Q10 (cfs) Q, f I Winter 7Q10 (cfs) _jam- !? 30Q2 (cfs) —
Toxicity Limits: IWC % (circle one) Acute / Chronic
Instream Monitoring:
Parameters t
Upstream '` Location
Downstream Location

Request No. :396C,
------------ WA`wTE.LDAD ALLOCATION APPROVAL FORM --------- -----------
Permit Number
Facility Name
Type of Waste
Status
Receiving Stream
Stream Class
5ubbasi n
County
Regional Office
Requestor
Date of Request
Quad
: NC21326
: DOBSON WWTP
: DOM
: EXISTING
: C'ODY CREEK
C
030702
SURRY
WINwTOi'd- ALEls
BRIDGES
: B 1 6NW
Drainage Area (sq mi) : 0.6
Average Flow
(cfs) : 1.0
Summer 7Q10
(cfs) : 0.17
Winter 7Q10
(cfs) : 0.3
30's2
(cfs) : .5
--- .,._. - _, -------- --- RECOMMENDED EFFLUENT LIMITS-µw---- ------------- ___..._,_
s/w
Wasteflow.
(maid):
.16
5-Day BOD
(mg/ l) :
30
Ammonia Nitrogen
(mg/1):
na
Dissolved oxygen
(mg/l) :
5
T'.:.�u
(mg/l) .
30
Fecal Col i farm (#/
1 00ml) :
1 000
p}1
(SU) :
4
6--9
------------------ -------- ----- MONITORING -- _ --__ ---- w..----_...----u_.._
Upstream ( YIN : `r` Location: UPSTREAM OF THE DISCHARGE
Downstream (YIN): Y Location: HIGHWAY 601
MONITOR INSTREAM FOR D.O.,CONDUCTIVITY,TEMPF ,AND FECAL COLIFORM.
. _._ ------ ---------------- ----------------------------- __--��� _. tom fG
Recommended by , �� _ Date 2l_1_
Reviewed by:
Tech. Support Supervisor
Ragi onal Supervisor,
Permits & Engineering
Date —Yo
Date -7
Date �1� l_ 87
NOV 12 1987
RETURN TO TECHNICAL SERVICES BY

DIVISION OF ENVIRONMENTAL MANAGEMENT
November 3, 1987
MEMORANDUM
TO:
Dale Overcash
FROM:
Steve Zoufaly �2-z
THRU:
Trevor Clements `L
SUBJECT:
Town of Dobson WWTP (NC0021326)
The Town of Dobson has had monitoring of MBAS in their previous permit.
After reviewing the facility's self -monitoring data (effluent), we have det-
ermined that a revision should be made in our permit limits previously sent
to you. In addition to the following:
_._.. .... _.Dw: _.. ._ 0:16 MGD-
BODS: 30 mg/1
NH,N: -
D.O.: 5 mg/l
TSS: 30 mg/l
Fecal Coliform: 1000/100 ml
pH: 6-9 SU,
an MBAS limit of 0.843 mg/l is required to protect the State's Water Quality
Standard of 0.5 mg/1 for class "C" water.
Monitoring for D.O., conductivity, temperature and fecal coliform will
be required upstream of the discharge and at NC 601, downstream of the
discharge.
If you have any questions, please let me know.
SZ:gh

Ax
CMS
�Q/os)
0-47)
Lv-��L- 0, z yl&

AIC
e-5. 2 (�
D,b
©. Z
d.�
n34�
Q. Z (

SZ
P&&. &)IJP
61 ' 0,/6 0t,.D
= ©.5
o
-4d2(0S = 0.1�q
etQ.-v = l t2 o
3C<S�2= o.s
D ww TP I
4 C>2: 1131.4600 ` -Q
04 = o' 5, CDA r I, 0
\ ti-ID 1ps = tu. 1-41 -+@,oLl b> -3
\\\ 3oC42c o.s'
U'S (P o l
oz. i i3 i togoo a-4
D -a--a, CA -r L(
3 9

-- 2 —
Po
40kc)5 (u
v .(:t l
f�.G
c7.G1
�Wkri) 3k
t --t Z
1. 2
t .� Z
p 12,0
5, - (e
-51T -�� �-.
133
55,E
aq,a
40tos� = 1 - 0.114e4s^ a.q1
r f l'"6
i•t6
eley
Al -SA.
14o-x,
it Zc�
33
(ton
0,15'
togs
0.36
52,fo
l O b a
0.3(4
iflLio
0.6t�
29•'-�

SUMMER
CBOD PROTECTED AT 45
NBOD PROTECTED AT 90
---------- MODEL RESULTS ----------
Discharger : DOBSON WWTP
Receiving Stream : CODY CREEK
_=____________________________________________________________________
The End D.O. is 7.42 mg/l.
The End CBOD is 6.00 mg/l.
The End NBOD is 8.75 mg/l.
�
______________________________________________________________________
WLA
WLA
WI. A
DO Min CBOD
NBOD
DO
Waste Flow
(mg/l) Milepoint Reach # (mg/1)
_______ _______ ____
(mg/l)
____
(mg/1)
__
(mgd)
__________
Segment 1
5.99 0.00 1
Reach 1
45.00
90.00
5.00
0.16000
Reach 2
0.00
0.00
0.00
0.00000
Reach 3
0.00
0.00
0.00
0.00000

MODEL SUMMARY DATA ***
�.
'
Discharger : DOBSON WWTP Subbasin : 030702
eiving Stream : COIY CREEK Stream Class: C
Summer 7Q10 : 0.17 Winter 7Q10 : 0.3
Design Temperature: 25.
;LENGTH! SLOPE! VELOCITY 1 DEPTH: Kd | Kd | Ka | Ka | KN | KN | KN0 ; KN0 |
-----------------------------------------------------------------------------------------------------
1 mile | fthmi:
fps
| ft !design; @204 fdesign| Q200 :design! 220Mesign| -2201 |
Segmpn
Reach
------------------------------------------------------------------------------------------------------
\ 1 0.11|133.00!
1
V,��
| 0.34 | 0,83 | 0.66 155,75 | 50.001 0.73 0,50 | 0.73 0.00 |
Sp0ment
l | 0.721 55.701
0.224
1 0,50 0.59 | 0.47 :25.02 22,441 0,73 1 0.50 0.73 0.00 |
Reach
-----------------------------------------------------------------------------------------------------
2 | | |
1
SeOment
l 0.98: 27,2O|
0.221
1 0,70 | 0.42 0.33 U2.05 1 10.81! 0.78 | 0.50 0.73 0,00 |
Reach
-----------------------------------------------------------------------------------------------------
3
< | | � |
�
Fl
CBOD (
NBOD |
�
cf
mg/l |
mg/l |
Segment 1
Reach
1
Waste
0.248
45.000
90.00O �
Headwat
0.170
2.000
1.000 (
Tributary
|
0.000 |
2.000
1.000 �
* Runoff
0.910 1
2.000 |
1.000 |
Segment 1
Reach
2
Waste
000
000
0.000 �
Tributary
0.000
2.000 |
1.000 �
* Runoff
0.910 |
2.000
1.000 �
Segment 1 Reach 3
Waste
Tributary
* Runoff 1 0.910 �
X��
2.000 |
2.000 1
* Runoff flow is in cfs/mile
0.000 �
1.000 �
1.000 |
D.O. |
frig /l �
5.000
7.44O
7.440
7.440
0.000
7.440
7.440
0.000
7.440
7.440

� .
.
'
|'Seg
# | Reach #
| Beg Mi |
' 1
1
0.00
1
1
0.01
1
1
0.02
l
1
0.03
1
1
0.04
1
1
0.O5
1
1
0.06
1
1
0.07
1
1
0.08
1
1
0.09
1
1
0.10
1
1
0.11
1
2
0.11
1
2
0.21
1
2
0.31
1
2
O.41
1
2
0.51
1
2
0.61
1
2
0.71
1
2
0.81
1
3
0.81
1
3
0.91
1
3
1.01
1
3
1.11
1
3
1.21
1
3
1.31
1
3
1.41
1
3
1.51
1
3
1.61
1
3
1.71
1 Beg
# 1 Reach #
| Beg Mi 1
SUMMER
'
CBOD
PROTECTED AT 45
NBnD
PROTECTED AT 90
D.O. |
CBOD |
>|JOO
| Flow �
5.99
27.51
53.80
0.42
6.16
26.92
52.59
0.43
6.81
26.35
51.43
0.44
6.44
25.8O
50.31
0.45
6.55
25.27
49.24
0.45
6.65
24.77
48.21
0.46
6.74
24.28
47.22
0.47
6.82
23.82
46.27
0.48
6.89
23.37
45.35
0.49
6.95
22.93
44.47
0.50
7.01
22.52
43.62
0.51
7.06
22.11
42.80
0.52
7'06
22.11
42.80
0.52
6.94
18.80
35.83
0.61
6.98
16.36
30.68
0.70
7.08
14.47
26.72
0.79
7.18
12.97
23.59
0.88
7.28
11.76
21.05
0.97
7.37
10.75
18.95
1.06
7.44
9.90
17.19
1.16
7.44
9.90
17.19
1.16
7.31
9.21
15.69
1.25
7.25
8.62
14.39
1.84
7.23
8.11
13.26
1.43
7.24
7.65
12.28
1.52
7.27
7.25
11.41
1.61
7.30
6.89
10.63
1.70
7.34
6.56
9.94
1.79
7.38
6.27
9.31
1.88
7.42
6.00
8.75
1.97
D.O. 1
CBOD |
NBOD
1 Flow |