NC0021644_Wasteload Allocation_19810203

NPDES DOCIMENT SCANNING COVER SHEET
NPDES Permit:
NC0021644
La Grange WWTP
Document Type:
Permit Issuance
Wasteload .ion
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Correspondence
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
February 3, 1981
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content on the reYerse side

North Carolina Department of Natural
Resources &Community Development
James B. Hunt, Jr., Governor Howard N. Lee, Secretary
DIVISION OF ENVIRONMENTAL MANAGEMENT
February 3, 1981
MEMORANDUM
TO: Jim Mulligan, Regional Supervisor
Washington Regional Office
FROM: Forrest Westall, Head
Technical Services Branc
4
SUBJECT: Seasonal Effluent Limitations
Town of LaGrange WWTP
Technical Services has completed its wasteload allocation modeling for
the subject facility per your office's request dated September 17, 1980.
Applying winter 7Q10 flow and design temperature information to the existing
model shows that no relaxation of the summer effluent limits can be allowed.
The effluent limits for both summer and winter operation are listed below:
Flow = 0.75 MGD
BOD5 = 5 mg/1
NH3-N = 2 mg/1
D.O. = 5 mg/1
Fecal Coliform = 1000/100 ml
TSS = 30 mg/1
pH = 6-9 (SU)
As required by 15 NCAC 2B .0404, a rationale as to the need for seasonal
effluent limitations must be provided by the requestor. Please call if
you have any questions.
cc:
Randy Williams
Kathy Poston
Bill Mills
P. O. Box 27687 Raleigh, North Carolina 27611
An Equal Opportunity Affirmative Action Employer

a'
Facility Name
E
o Existing
c.
Proposed
Design Capacity (MGD): 0.7G--- Industrial (% of Flow): Domestic (% of Flow): ( O
CD
76
Receiving Stream: /yllh52� 4/IeC�. Class: C
o %�.�,L-1110 Sub -Basin: 63-oci-os
E Reference USGS Quad: FZ7 (Please attach) Requestor• �JP,1�-` k►rP Regional Office W SL' It 4O 1
NPDES WASTE LOAD ALLOCATION
L4 110P1 4s}�.t�tx► �' +re:a�v�Xbi
Date:
CD
ac
Permit No : NG bon.OA- Pipe No.: 00 ( County- Le'Lotr"
(Guideline limitations, if applicable, are to be listed on the back of this form.)
Win.14e-r'
Design Temp.: 'Pe at fib' Drainage Area: 7.71 rn 2- Avg. Streamflow: 3,5 cFS
7Q10: 0, f ` eS Winter 7Q10: O. Z c'R 30Q2:
4-6
cu Location of D.O.minimum (miles below outfall): 0.9 i.L .dr. Slope:. 2.1 I
cu
E Velocity (fps) : 0.1 K1 (base e, per day, 200C) : _ ' •`r ` K2 (base e, per day, 20°C) :.__._ 1
0
c..
eztI 1umrnev l i
N
m
Cl)
I Effluent
Characteristics
Monthly
Average
Comments
.N
i
it
(6,-,
odz.
0C--
_ _,5„.L.
-1
I
Original Allocation
Revise Allocation
Pre red By:
h�► n fie,✓ L;mit°
Effluent
Characteristics
Monthly
Average
Comments
Nft9
XO
t'eta?
n
1j CM
/n M
'
'65
.Q )
104
10-q_L (S.(t_
Date(s) of Revision(s)
(Please attach previous allocation)
41)
Reviewed By:
Date: 1 Z(iif 1
1

WASTE LOAD ALLOCATION APPROVAL FORM
Facility Name: LaGrange WWTP
County: Lenoir
Regional Office: Washington
Type of Wastewater: Industrial
Domestic 100
If industrial, specify type(s) of industry:
Sub -basin:
Requestor:
% 0
03-04-05
Roger Thorpe
Receiving stream: Mosely Creek
Other stream(s) affected: NA
7Q10 flow at point of discharge:
30Q2 flow at point of discharge:
Class:
Class:
0.1 cfs (winter = 0.2 cfs)
C-SWP
Natural stream drainage area at discharge point:
2.71 m2
Recommended Effluent Limitations
The following apply as both summer and winter limits:
Monthly Average
BOD5 = 5 mg/1
NH3-N = 2 mg/1
D.O. = 5 mg/1
Fecal Coliform = 1000#/100 ml
TSS = 30 mg/1
pH = 6-9 (SU)
Flow = 0.75 MGD
This allocation is:
Recommended and rev,
/ / for a proposed facility
// for a new (existing) facility (original allocation done at
/ / a revision of existing limitations Qw = 0.4 MGD)
/ /
ewed • by •
te
Head, Techncial Services
Reviewed by:
Regional Supervisor
Permits Manager
a confirmation of existing limitations
Branch
Approved by:
Division Director •��
//644-70
Date:
Date:
Date:
Date: > -)6
Date: % .ta7

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