NC0026051_Wasteload Allocation_19841107

H
O
44
NO /"`° �` F` NPDES WASTE LOAD AVOCATION
Facility Name: • .b to' 1Qm LSO %/`io% 4-1 T P
Existing J
Proposed
0 Permit Ab .: ye( (X) 2605-1 Pipe No.: clf,t County: / iA!'{ cz %?
Engineer
Date Rec. I #
g c
Date 8� •
Design Capacity (MGD) : 3,0 ,Industrial (% of Flow) : Domestic (% of Flow) : /GO
Receiving Stream: 130 r �1 ea Sft Cr e e f�
Reference USGS Quad:
Class:
C' Sub -Basin: - �i f - o % 173-0b "'0 5
(Please attach) Requestor: fp yr tti
e, , Regional Office 102()
(Guideline limitations, if applicable, are to be listed on the back of this form.)
Design Tamp.:
7Q10 (cfs)
Z
Drainage Area (mil ) . Avg_ Streamflow (cfs) :
30Q2 (cfs)
Slope (fpm) fl-ill
r
Winter 7Q10 (cfs) 0.4 (1) -F
Location of D.O. minimum (miles below outfall):
Velocity (fps):
Kl (base e, per day): K2 (base e. per day):
Effluent
Characteristics
Monthly
Average
Comments
Ferl t L c4pm)
AS.
l at7D 1 rt r�
I UGD
1
rSA()
t -c (,s.4) ,
Original Allocation
Revised Allocation
Confirmation n
l�
Prepared By:
0
0
Comments:
ykvs. UikA4
spi
Effluent I : onthly
Characteristics Lverage
Comments
i-8V
.2s-it
oa,„
1,0 1.Q--
viewed By:
Date:

Rec 'je t. No • i .9H0
Facility Name
type Of Waste
Receiving Stream
Stream Class
Subbasin
County
Regional Office
Renuestor
Drainage Area (se mi)
7010 (cfs)
Winter 7010 (cfs)
3002 (t is )
WASTEL CIAII ALLOCATION AF'F'ROVAL. I- (1RM
•
•
.
•
•
•
•
:
•
•
•
•
•
•
•
•
•
Wastet'1ow (mgd)
5-Day BOLT (mg/1)
Ammonia Nitrogen
Dissolved Oxygen
pH (SU)
Fecal Coliform
TSS (mg/1)
TOT F'HUS MG/L
:
(mg/1):
(mg/1):
(/100m1):
•
•
DURHAM fRIANI.iI..E WW [F'
IIUMES11C
NLIRTHEASI CREEK
C
030605
DIURHAM
RALEIGH
HELEN FOWLER
0.1
.459
WATER QUALITY
SECTION
RECOMt1E.NI=F ).+ EF FI. UE.N t LI MI'( S
4��wrrit�l k}A,
3.0 5.0
9 18
4
5 5
6-9 6-9
1000 1000
30 30
1..0 LP
COMMEN'( S
KEG13; ,! OFFICE
See atfer
5}C i 1 d /1-f - ait( cc 1 O(1
FACIL.( Y [S : PROPOSE:U ( ) EXLST1NI; ( ) NEW ( )
LIMITS ARE : REVISION ( ) CCINFIRMATION ( ) OF THOSE NRI-.V) 0USI Y ISSUED
RECOMMENDED BY:
REVI:EWh.:LI BY:
SUPERVISOR, TECH. SUPF'CIRI
REGIONAL STJF'ERVISOR
APProvai is ( ) preliminary
PERMITS MANAGER
APPROVED BY :
LIIVISION DIRECTOR
(V) final
--_DAIS. ; /P7
_ IJ A I E :..1 � 5�89—

********** MODEL. RESULTS **********
DISCHARGER :DURHAM TRIAN►aLE WWTP
RECEIVING STREAM :NORTHEAST CREEK
******************:****************************************************
THE END D.U. IS 6.55 MG/L
*****************************************************MM***********
THE END CBUL► IS 6.11 MG/L
**************************************************:********** :**:****:**
THE END NSUD IS 0.00 Mli/L
*******************************************************'***:*****'****
THE D.U. MIN. OF SEGMENT 1 IS 4.96 M►.i/L
THIS MINIMUM IS LOCATED Al SEGMENT MILEF'U1NI 0.7
WHICH IS LOCATED IN REACH NUMBER 1
THE WLA FOR SEGMENT 1 REACH 1 IS 17 Mt /L OF CHUB
THE W(..A FOR SEGMENT 1 REACH 1. (5 0 M(3/L OF NE►UD
THE REQUIRED EFFLUENT D.U. 1S 5 M(3/L
THE WASTEFLOW ENTERING SEG 1 REACH 1 .IS 3 MGD
********************:******************-;************:'�****************:**

********** MODEL RESULTS ***-**EK***
!:DISCHARGER :TRIANGLE WWTF.
RECEIVING STREAM :NORTHEAST CREEK
************************* ; **;********* :*****:*:4:>!!,+:**:*********;****.*;*****:
THE END U.O. IS 77.17 MG/L
**********************************************************M********
THE END CBOU IS 4.02 MG/L.
**************************************************************:**:******
THE END NBOD IS 0.00 MG/L.
*****:#******_*************:*%Kok******************************:************
THE D.O. MIN. OF SEGMENT 1 IS 5.04 MG/L.
THIS MINIMUM IS LOCATED AT SEGMENT MTI..EPDINT 2
WHICH IS LOCATED IN REACH NUMBER 2
TI—IE WLA FOR SEGMENT 1 REACH 1 IS 13 MG/L.. OF CBOD
THE WLA FOR SEGMENT 1 REACH 1 .T.S 0 MG/L OF NBOD
THE REQUIRED EFFLUENT D.O. IS 5 MG/L
THE WASTEFLOW ENTERING SEG 1 REACH 1 IS 0.1 MGD
THE WLA FOR SEGMENT 1 REACH 2 IS 13 MG/I... OF CBOU
THE WLA FOR SEGMENT 1 REACH 2 IS 0 MG/L.. OF NBOD
THE REQUIRED EFFLUENT D.O. IS 5 MG/L
THE WASTEFLOW ENTERING SEG 1 REACH 2 IS 3 MGD
THE WLA FOR SEGMENT 1 REACH 3 IS 13 MG/L OF CBOU
THE WLA FOR SEGMENT I REACH 3 IS 0 MG/I._ OF NBDD
THE REQUIRED EFFLUENT D.O. IS 5 MG/L
THE WASTEFL_OW ENTERING SEG 1 REACH 3 IS 0,2 MOTS
********:ic************************************************************'n

Justification for Effluent Limits Less Than 10 & 4
Discharger Name:
Suggested limits
Waste flow (mgd):
Receiving Stream:
7Q10: U I
DO minimum
DO minimum
DO min. at
(if 7Q10
))U rivirl71 ,
BOD5: Cj1
3. o -I.
�rs-I
Igor ere''
Avg:
at assigned limits:
at 10 BOD5, 4 NH3:
15 BOD5, 4 NH3:
= 0 cfs)
n
,72
64)
DO: J
DA: o4,, j n1 Z
Schematic diagram of discharge and Receiving Stream: (Show flow sites,
location of interacting dischargers and approximate location of DO minimum).
wh, p6 S t a
6b 41,3 "NZ( w; JI
6Ravn, 5 rn.5 •
‹TCC• nI4r�
.)1-r0,54
gu,u,GA-)s C(Z-
U bA AMASS
,003 . ,< -lhct ale"— �
T it,ant ,ki mop
3.0,314
7�ia=D.1 c
51Rote, - 5.0 c+
15 a -f i r 5-kf ei it ( l 0 > O C7C5)
a.bLL a ova hL eLosvrtirri . DJ taicon%a"�1
p AA a a 51yn175 taxr.l. ,lres5 Or) 17.e5._

•
The water quality policy, "Maximum Treatment Requirements for Wasteload
Allocations for Dischargers of Domestic Wastewater" signed by the Director of
the Division of Environmental Management on August 31, 1984, allows effluent
limits more restrictive than 10 and 4 for the following cases:
1. Dischargers to flowing streams
2. Dischargers to zero flow streams which impact downstream flowing
waters
3. Large proposed dischargers to zero flow streams which are predicted
to have severe impacts on water quality (cases where no discharge
is not an alternative).
In all three of these cases, strict effluent limits are required to
protect the aquatic habitat. Flowing streams support viable fish and
insect populations which can be stressed and damaged by violations of the
dissolved oxygen water quality standard. The steady - state Streeter
Phelps Level B model used by the Technical Support Group to simulate
dissolved oxygen reactions in flowing streams can reliably predict conditions
in these systems. When limits of 10 mg/1 BOD5, 4 mg/1 NH3 are simulated by
the model, low dissolved oxygen concentrations are predicted. These concen-
trations can be expected to damage the aquatic ecosystem.