NC0027103_Wasteload Allocation_19840529

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Facility Name:
Existing
Proposed
NPDES WASTE LOAD ALLOCATION
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Permit No.: /J 06 271a3
Pipe No.: CO
Engineer
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Date Rec. 4 #
5 �I ,116,3
Date:
County: DUes,
Design Capacity (MGD): . g Z Industrial (% of Flow): Domestic (% of Flow): /1 C?
Receiving Stream: L,a rnLer /�;J e" Class: C Sub -Basin: 63_ O --.51
Reference USGS Quad: (Please attach) Requestor• Aae Regional Office FAO
(Guideline limitations, if applicable, are to be listed on the back of this form.)
Design Temp : Drainage Area: '170 vv. Z Avg. Streamflow: 5Scb G
7Q10: 12 1 e-"4`a Winter 7Q10: 30Q2
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4- v
Location of D.O.minimum (miles below outfall): Slope.
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Velocity (fps): K1 (base e, per day, 20°C): K2 (base e, per day, 20°C)•
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Effluent
Characteristics
Monthly
Average
Comments
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30
"11-9
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TSS
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Original Allocation
Revised Allocation
Confirmation
Prepared By: ,JIILU'O\
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Effluent
Characteristics
Monthly
Average
Comments
Date(s) of Revision(s)
(Please attach previous allocation)
I
Reviewed By: Date:
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REOUEE:T NO. : 1163
********************* WASTELOAD ALLOCATION AF'PROV(I.. FORM * :*******************
FACILITY NAME PEMBROKE WWTF'
TYPE OF WASTE DOMESTIC
COUNTY ROBESON
REGIONAL. OFFICE FAYETTEVILLE
RECEIVING STREAM LUMBER RIVER
7010 : 121 CFS W7010 :
DRAINAGE AREA : 420 SQ.MI.
CFS
REOUESTOR : HELEN FOWLER
SUBBASIN : 030751
3002 : CFS
STREAM CLASS :C
:**:*******:************* RECOMMENDED EFFLUENT LIMITS ************************
WASTEFLOW(S) (MGD) . 0.82
BOD--5 (MG/L) . 30
NH3--N (MG/ L )
D.O. (MG/L)
PH (SU) . 6-9
FECAL COLIFORM (/100ML):
TSS (MG/L) : 30
:*******************************************************************************
FACILITY IS : F'ROPOSEI! ( ) EXISTING (`) NEW ( )
L.IMITS ARE : REVISION ( ) CONFIRMATION (✓f OF THOSE PREVIOUSLY ISSUED
REVIEWED AND RECOMMENDED BY:
MODELER
sUPE:RVISOR,MODE:LING GROUP
REGIONAL SUPERVISOR
PERMITS MANAGER
• • __•1_`-"^ __DATE
:._ J//.6_ _ _ __-_DATE
_-DATE :
07/1. -
• /
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DIVISION OF ENVIRONMENTAL MANAGEMENT
June 21, 1984
MEMORANDUM
To: Mick ['bland
FROM: J. Trevor Clements \�
THROUGH: Randy Willi anys ! j
Steve Tedder
SUBJECT: Modification of Wasteload Allocation
'Ibwn of Pembroke-WWTP
Robeson County
Following your letter of request, the Modeling Group has re-evaluated
the need for a pH limit for the `Ibwn of Pembroke WWTP. Pembroke has a
design capacity of 0.82 MGD and discharges to the Lumber River which has
a 7Q10 of 121 cfs, and an average flow of 588 cfs. The dilution ratio,
therefore, will typically range between 148:1 and 717:1. It is the general
consensus of the Modeling Group that this dilution should be sufficient to
maintain water quality with regard to pH.
It is recommended that the Pembroke WWTP continue to monitor pH levels.
Effluent values should not be allowed to drop below 5.0 SU. If problems
appear which are attributed to low pH, then the 6-9 SU pH limit may have
to be reinstituted.
JTC:cs

DIVISION OF ENVIRONMENTAL MANAGEMENT
June 19, 1984
MEMORANDUM
TO: Randy Williams, Leader
Modeling Group
FROM: M. J. Noland, Regional Supervisor
Fayetteville Regional Office
SUBJECT: Modification of Wasteload Allocation
Town of Pembroke - Wastewater Treatment Plant
Robeson County
It is requested that the wasteload allocation for subject facility be
reevaluated using a pH limitation of 5.0 to 8.5 or the elimination of the pH
limitation if the dilution factor is great enough. The Town has had problems
meeting the 6.0 minimum pH due to lower pH ranges in the influent (6.0 - 6.5)
and a reduction of pH through the extended aeration process.
cc: Bill Mills