NC0024945_Wasteload Allocation_19820528

NPDES DOCUNENT SCANNING COVER SHEET
NC0024945
Irwin Creek WWTP
NPDES Permit:
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Correspondence
Owner Name Change
Draft Permit
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
May 28, 1982
This document is pririted on reuse paper. - ignore any
cc ritent on the re -verse side

rf`ice to Co 1
Facility Name.
Existing
Proposed
a
NPDES WASTE LOAD ALLOCATION
�A"uI� ate(
Permit No.: 9G h( % / 7� Pipe No.:
Design Capacity (MGD):
Receiving Stream:
Reference USGS Quad:
Industrial (% of Flow):
y
Class:
(Please attach) Requestor•
County:
It1reGk(t1'c-r 6t�
Domestic (% of Flow) : ) d0
Sub -Basin:
C,
(Guideline limitations, if applicable, are to be listed on the back of this form.)
y
Regional Office
Design Temp.: / oG
7Q10:.
a)
a Location of D.O.minimum (miles
E
0
0
VJ
1
L
Q?
y
Drainage Area: 36), Z- v)2. Z- Avg. Streamflow: L( r 5
Winter 7Q10: r 30Q2•
below outfall):
Velocity (fps): Q 9 1 Kl (base e, per day, 200C):
Slope.
0 * 6 K2 (base e, per
day, 20°C) • S73
vytw r (/I' ;i 1--DG %3f�
Effluent
Characteristics
Monthly
Average
Comments
155
-,0f1
i -I
6-1" y
-r..-Tr rep': f,�/ ��'-y i.
) Oo//o»
QT'.
,
1), c,
s 1,11, !,e_.
Original Allocation
Revised Allocation
A-f irmation
epared By: t.,//
Effluent
Characteristics
Monthly
Average
Comments
1 S5
30�
6- s a
P
�u f-(3 -I ,t J
/R 1''1'91._.
r r /.
jo ,
-S- - wt dr Le
aaj Ina_s b to rc c a f ./ 6 ira-'ek
Date(s) of Revision(s)
(Please attach previous allocation)
Reviewed By:
Date:
/es- S i to y eA:1—
/ f/

FSrm #O1
#
WASTE LOAD ALLOCATION APPROVAL FORM
Facility Name:
Irwin CrePk WWTP
County: Mecklenburg Sub -basin:
Regional Office: Mooresville Requestor:
Type of Wastewater: Industrial
Domestic
CTB34
205(g)
If industrial, specify type(s) of industry:
Receiving stream: Irwin Creek
Other stream(s) affected: Sugar Creek
7Q10 flow at point of discharge: 7.5 cfs
11 cfs
30Q2 flow at point of discharge:
Class: C
Class: C
Natural stream drainage area at discharge point:
30.5 mil
Recommended Effluent Limitations
Qw = 15 MGD
Summer (April 1
-Oct. 31) Winter (Nov. 1-March 31)
BOD5 = 16 mg/1
TSS = 30 mg/1
pH = 6-9 SU
NH3-N = 8 mg/1
Fecal Coli = 1000/100 ml
D.O. = 5 mg/1
BOD5 = 30 mg/1
TSS = 30 mg/1
6-9 SU
18 mg/1
1000/100 ml
DO = 5 m3/1
Note: This is for proposed 201 expansion. Please see
attached memo.
This allocation is: /X/
/ /
Recommended and reviewed,by:
\ -1; ,� /
Head, Techncial Services
Reviewed by:
Regional Supervisor /:_
Permits Manager
Approved by:
Division Director
rA
for a proposed facility (see above note)
for a new (existing) facility
a revision of existing limitations
a confirmation
of existing limitations
J

North Carolina Department of Natural
Resources &Community Development
James B. Hunt, Jr., Governor Joseph W. Grimsley, Secretary
DIVISION OF ENVIRONMENTAL MANAGEMENT
February 5, 1982
MEMORANDUM
TO: Robert Brown - 205(g)
FROM: Mark Lewis - Monitoring & Technical Services Branch
SUBJECT: Effluent Limitations
Irwin Creek WWTP
The model for the Irwin Creek WWTP has been recalibrated. Because of the
recalibration, the limits for the projected 201 expansion have become
slightly less stringent than indicated in the previous 201 letter dated
June 25, 1980. At that time, we indicated that the effluent limits for
a 15 MGD facility located on Irwin Creek would be as follows:
Summer (April 1 - Oct. 31) Winter (Nov. 1 - Mar. 31)
BOD5 = 12 mg/1
NH,H4 7 mg/1
DO = 5 mg/1
Fecal Coliform = 1000/100 ml
pH = 6-9 S.U.
TSS = 30 mg/1
BOD5 = 24 mg/1
NHS-N = 14 mg/1
DO = 5 mg/1
Fecal Coliform = 1000/100 ml
pH = 6-9 S. U.
TSS = 30 mg/1
The present limits for a 15 MGD facility have been revised to the following:
Summer (April 1 - Oct. 31) Winter (Nov. 1 - Mar. 31)
BOD5 = 16 mg/1
NH-N = 8 mg/1
DO = 5 mg/1
Fecal Coliform = 1000/100 ml
pH = 6-9 S.U.
TSS = 30 mg/1
BOD5 = 30 mg/1
NIJg-N = 18 mg/1
DO = 5 mg/1
Fecal Coliform = 1000/100 ml
pH = 6-9 S.U.
TSS = 30 mg/1
If you have any questions or if this change poses any problems in the
201 process, please call.
ML:cs
P. O. Box 27687 Raleigh, N. C. 27611-7687
An Equal Opportunity Affirmative Action Employer

.0
Winter Allocation
Qw = 15 MGD
C w = 45
Nws,=83mg/l
DOw = 5.0 mg/1
Qs = 8.8 cfs
Cs = 4.2 mg/l
Ns = 8.6 mg/l
DOs = 9.2 mg/1
Qr = 0.84 cfs/mi.
Cr = 2 mg/1
Nr =1 mg/1
DOr = 9.2 mg/1
K1 = 0.17
K c = 0.17
Kn = 0.27
Knr = 0.27
K2 = 3.43
DOsat = 10.2
V = 0.81 fps
Note: Winter allocation is limited to double the summer allocation in
terms of BODultimate
* In allocation, Nw= 4.5 * NH4-N.

y . �
Summer Allocation
Reach I
Qw = 15 MGD
Cw = 24
Nw *=40
D0w = 5.0 mg/1
Qs = 7.5 cfs
Cs = 4.2 mg/1
Ns = 8.6 mg/1
DOS = 7.65 mg/1
Qr = 0.71 cfs/mi.
Cr = 2 mg/1
Nr = 1 mg/1
DOr = 7.65 mg/1
Kl = 0.25
Kc = 0.25
Kn = 0.41
Knr =0.41
K2 = 4.18
V = 0.81
DO sat = 8.5
* In allocation Nw(NOD) = 4.5 * NH4-N.