NC0021253_INSTREAM ASSESSMENT_19861229

NPDES DOCYMEMT SCANNING COVER SHEET
NPDES Permit: NC0021253
Havelock WWTP
Document Type: Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Engineering Alternatives Analysis
201 Facilities Plan
Instream Assessment (67B)
Correspondence re: Mercury
Permit
History
Document Date: December 29, 1986
Tlzis documeat is priated oa reuse paper-ignore aay
content on the reverse side

DIVISION OF ENVIRONMENTAL MANAGEMENT
December 29, 1986
MEMORANDUM
TO: Kent Wiggins
FROM: Steve Zoufaly
THRU: Trevor Clements
SUBJECT: Havelock WWTP
Addendum to In-Stream Assessment (12/17/86)
A level B estuary model was run for the Town of Havelock in order
to assess an SOC request at 1.062 MGD with limits of BOD 15 mg/l and
NH3 2 mg/l. At this set of proposed limits the model predicted a
violation of the requirements to grant an SOC.
Upon your request, the Town was reevaluated at BOD 20 mg/1 rather
than the previously modeled BOD 23 mg/l. At BOD5 14 mg/l and NH3 1.5
mg/1 (BODu 20 mg/l = BODS 14 + � NH3 1.5) , the Town of Havelock meets
the requirements for granting an SOL
SZ/gh
cc: Jim Mulligan

DIVISION OF ENVIRONMENTAL MANAGEMENT
December 17 , 1986
M E M O R A N D U M
TO: Jim Mulligan
FROM: Steve Zoufaly I
L
THROUGH: Trevor Clement
Steve W. Tedder
SUBJECT: In-Stream Assessment
Town of Havelock WWTP
Craven County
The Town of Havelock in Craven County is requesting permission to increase
their SOC wasteflow from a pre-SOC average of 0 . 889 MGD to 1 .062 MGD. The town ' s
WWTP discharges into East Prong Slocum Creek , (c-swamp, 7010,=0, tidal influ-
ence) , which is located within the Neuse River Basin . The facility was averaging
BODO 7 . 17 mg/ l , NH*-N 0.26 mg/ I and D.O. 8 . 47 mg/ I for the period of December
1985 through September 1986 . The facility has been having troubles meeting its
BODE and solids limits during wet weather periods and thus entered into an SOC in
September of this year . The current request expands the amount of additional
wasteflow originally approved .
A level B estuary modeling analysis was completed using wasteflows of 0.889
MGD and 1 .062 MGD. The Washington Regional Office suggested limits that the
facility should be able to comply with : BODO 15 mg/ l , NH,-N 2 mg/ I and D.O. 6
mg/ I . The model predicts that the additional increase in flow at the proposed
limits will cause instream D.O. to drop below 5.0 mg/ 1 for 8/ 10 of a mile . This
is 3/ 10 of a mile greater than the requirements for granting an SOC allows ,
although the expected net change in minimum D.O. is only 0 . 23 mg/ l .
The following is a summary of the results .
t
0. 889 MGD 1 .062 MGD
D.O. minimum 5 .0 4 .77
D.O. sag point (miles below discharge) 0. 1 0 . 1
* miles D.O. <5 .0 mg/ I 0 0 .8
K miles D.O. = 8 0 0

The model summary data is as follows :
1010,=0 cfs
Design temperature: 290C
Stream segment length : 1 .5 miles
Depth : 5 ft . (average)
Width : 65 ft . (average)
Max . tidal velocity : 0. 2 fps
Inflow background D .O. : 1 .0 mg/ I
Estuary D.O. : 6 . 22 mg/ I (80% saturation)
Dispersion : 0 . 3 sq. mi . /day
K, : 0 .53 per day
KQ: 0 . 4 per day
If any additional information is required, please advise .
SZ/ps
CC : Page Benton
Kent Wiggins

14CHAR'GER HAVELOCK WWTF'
NAME OF ESTUARY E PRONG SLOCUM CREEK
DEPTH 4 5 , 00 FEET
QIDTH 63 . 00 FEET
VOLUME 1 2 . 574E}006 CUBIC FEET
FRESHWATER INFLOW 0 , 00 CFS
WASTEWATER FLOW t 0 . 89 MOD
ULT . POD OF WASTE 20 , 00 MG/L
MAX TIDAL. VELOCITY 0 . 12 KNOTS
CROSS-SECTION AREA 325 . 00 SO . FT .
ADVECTIVE VEL . S 0 . 07 MI/DAY
I•ISF'L:RSIO?d I 0 . 30 SO . MI . /DAY
K1 0 . 53 PER DAY
K2 0 .40 PER DAY
POD AT DUTFALL = 1 . 7333812394 MG/L .
D . O. AT DUTFALL = 5 . 16220405794 MG/L
MILEPOT_NT UPSTREAM POD UPSTREAM D . O .
0 .00 1 . 73 5 . 16
MILEPOINT DOWNSTREAM POD DOWNSTREAM DO
0 . 00 1 . 73 5 . 16
0 . 10 1 . 53 5 . 16 sag A
0 . 20 1 . 36 5 . 17
0 . 30 1 . 20 5 . 18 SAG
0 . 40 1 . 06 5 . 21 _ 4.95
0 . 50 0 . 94 5 . 24
0 . 60 0 , 83 5 . 28
0 , 70 0 .74 5 , 32
0 . 80 0 , 65 5 . 36
0 . 90 0 . 58 5 . 41
1 . 00 0 . 51 5 . 45
1 . 10 0 . 45 . 5 , 50
1 . 20 0 . 40 504
1 . 30 0 . 36 5 . 58
1 . .40 0 . 31 5 . 62
1 . 50 0 . 28 5 . 66
THE WASTE.LOAD ALLOCATION FOR HAVELOCK WWTF IS 20 MG/L

0I'SCHARGER I HAVELOCK WWTP
NAME OF ESTUARY E WRONG SLOCUM CREEK
DEPTH 2 5 . 00 FELT
WIDTH 65 . 00 FEET
VOLUME ; 2 . 574E+006 CUBIC FEET
FRESHWATER INFLOW 0 . 00 CFS
WASTEWATER FLOW I 1 .06 MGD
ULT , ROD OF WASTE. 20 .00 MG/L
MAX TIDAL VELOCITY I 0 . 12 KNOTS
CROSS-SECTION AREA 325 . 00 SO FT .
ADVECTIVE VEL . 0 . 08 MI/DAY
DISPERSION t 0 . 30 SO . MT . /DAY
K1 2 0 . 53 PER DAY
K2 0 . 40 PER DAY
ROD AT OUTFALL = 2 . 06738501631 MG/L .
D .Q . AT IIUTFALL = 4 .96335967896 MG/L
MILEPOINT UPSTREAM ROD UPSTREAM D . O .
0 . 00 2 .07 4 .96
MILEPOINT DOWNSTREAM ROD DOWNSTREAM DO
0 . 00 2 . 07 4 .96
0 . 10 1 . 63 4 . 95 //
0 .'20 1 . 63 4 .96 �Ao m'.�c S3�c 6clow S.Uwq�l
0 . 30 1 . 44 4 . 98 C1
0 . 40 1 .28 5 . 01
0 . 50 1 . 14 5 . 05
0 . 60 1 . 01 5 . 09
0 . 70 0 . 89 5. 14
0 . 80 0 . 79 5 . 19
0 . 90 0 . 70 5 . 24
1 . 00 0 . 62 5 . 29
1 . 10 .0 . 55 5 . 34
1 . 20 0 . 49 5 . 39
1 . 30 0 . 44 5 . 44
1 . 40 0 . 39 5 . 49
1. . 50 0 . 34 5. 53
THE WASTELOAD ALLOCATION FOR HAVELOCK WWTP IS 201MG/L

DISCHARGER 1 HAVELOCK WWTP
NAME OF ESTUARY E PRONG SL.000M CREEK
DEPTH 5 . 00 FEET
WIDTH 65 , 00 FEET
VOLUME 1 2 . 574E+006 CUBIC FEET
FRESHWATER INFLOW 0 . 00 CFS
WASTEWATER FLOW 1 0 . 89 MGD
ULT . BOD OF WASTE 1 23 . 00 MG/L
MAX TIDAL_ VELOCITY 0 . 12 KNOTS
CROSS-SECTION AREA 325 . 00 St7 . FT .
ADVECTIVE VEL.. . 0 . 07 MI/DAY
DISPERSION 1 0 . 30 80 . MI . /DAY
K1 1 0 . 53 PER DAY
K2 1 0 . 40 PER DAY
I:tOD AT OUTFAL.L. = 1 . 97696450874 MG/L .
D . O . AT OUTFALL _ 5 , 00647014142 MG/I_
MIL.EPOINT UPSTREAM DOD UPSTREAM D . O .
0 . 00 102 5 . 01
MIL.EPOINT DOWNSTREAM BOD DOWNSTREAM DO
0 . 00 1198 5 . 01
0 . 10 1 . 75 5 . 00
0 . 20 1. . 55 5 . 01 5'OO
0 . 30 1 . 37 5 . 03 - U'3-
0 . 40 1 . 21 5 . 0;:) d3
0 . 50 1 . 07 5 + 10
0 . 60 0 . 95 5 . 14
0 . 70 0 . 84 5 . 19
0 . 80 0 . 75 5 . 24
0 . 90 0 . 66 5 . 29
1 . 00 0 . 58 5 . 34
1 . 10 0 . 52 5 . 39
1 .20 0 . 46 5 , 44
1 . 30 0 . 41 5 . 49
1 . 40 0 . 36, 5 . 53
1 . 50 0 . 32 5 ♦ 58
THE WASTELOAD ALLOCATION FOR HAVELOCK WWTP IS 23 MG/I_

DISCHARGER 1 HAVELOCK WWTP
NAME OF ESTUARY E PRONG SLOCUM CREEK
DEPTH 1 5 . 00 FEET
WIDTH 65 . 00 FEET
VOLUME 2 , 574E+006 CUBICC FEET
FRESHWATER INFLOW 0 . 00 CFS
WASTEWATER FLOW 1 1 . 06 MOD
ULT . BOD OF WASTE 1 23 . 00 MG/L
MAX TIDAL VELOCITY 0 . 12 KNOTS
CROSS-SECTION AREA ! 325 . 00 SOFT .
ADVE.CTIVE VEL . 0 . 09 MI/DAY
DISPERSION 0 . 30 SO .MI . /DAY
K1. 0 . 53 PER DAY
K2 1 0 . 40 PER DAY
BOD AT OUTFAL.L - 2 .35796601036 MG/L .
D . O , AT OUTFALL. = 4 , 77825341.453 MG/L
MILEPt7INT UPSTREAM BOD UPSTREAM D . O .
0 . 00 2 , 36 4 . 78
MILEPOINT DOWNSTREAM BOD DOWNSTREAM DO
0 . 00 2 . 36 4 . 70
0 . 10 2 . 09 4 . 77
0 .20 1 . 96 4 , 78 8�io O.o, 6daw 5.ovok
0 . 30 1 . 65 4 . 60
0 . 40 1 . 46 4 ,S3
0 . 50 1 . 29 4 . 8S
0 . 60 1. . 15 4 , 92
0 . 70 1. . 02 4 . 98
0 .90 0 . 90 503
0 . 90 0 . 80 5 . 05'
1 . 00 0 . 71 5 , 15
1 . 10 0 . 63 5. 21
1 . 20 0 . 56 5 . 27
1 . 30 0 . 50 5 . 32
1 . 40 0 , 44 5 . 38
1 .50 0 . 35' 5 . 43
THE; WASTELOAD ALLOCATION FOR HAVELOCK WWTP IS 23 MP,/L

Request Form for In-stream Assessment for 67B
NAME OF FACILITY H 1_—(N TA -----_ SUBBASIN 03, 5; ye-/G
COUNTY GNa1/<� ----_ REGION NO 6
---- DESIGN FLOW 1. 25- *nQ
RECEIVING STREAM-_Ea ,['t'___ptv�n Gv�-¢�----------
-- —
BACKGROUND DATA
A . Why is SOC needed? (Facility is out of compliance with which
effluent limits?)
B . History of SOC requests :
1 . Monthly Average waste flow RLC'�, lfe'l�prior to any SOC -_----Q _� ��--- mgd ` '`- .r
410V 2 Q 1985
Time period averaged thru SfSC_'fA;
2 . Previously approved SOC ' s :
Pa
Date : 91/2_1.-r flow : ! I 3So
Date :--- flow :_-----_-----mgd
total of previously approved SOC flow: /IS 3. -0
3 . Flows lost from plant flow : —__mgd
( facilities that have gone
off line)
4 .. Current SOC request flow: ---- S76SG 9u
S . Total plant flow post-SOC
( sum of original flow and
SOC flow minus losses) flow: --- � _Q6 2--mgd
6 . Is this an accurate flow balance for plant? Why/why not?
�� � QV yr .

t:
C . Please attach DMR summary for past year for all permitted parame-
ters . If possible , include reports from previous years if
facility has been under SOC for more than a year .
CURRENT SOC RE UEST
A . Request is for domestic or industrial waste? If it is a combin-
ation , please specify percentages .
Al( +"L^'J-`G
B . What type of industry? Please attach any pertinent data .
A/A
C . The region proposes the following SOC limits :
BODS IS mg/1
NH3 2 mg/l
DO 6 mg/1
TSS 5-0 mg/l
fecal coliform-----L&G ---#/100m1
pH------- 6; -C/ SU
other parameters
D . What is the basis for these limits?
a re a A,. G s �.

5Z
03o�io
-- - - -- — - -- ---- -- - ---- ---50-� - -DO .-
7-Is
-- l�e, J _= 5- - - - ------ - - -- - -- - -- - - - - -- ---- -

LtL I••
DISCHARGER : HAVELOCK WWTP
NAME OF ESTUARY : E PRONG SLOCUM CREEK
IIEPTH : 5 . 00 FEET
WID'1'N : 65. 00 FEET
VOLUME : 2 . 574E+006 CUBIC FEET
FRESHWATER INFLOW 0.00 CFS
WASTEWATER FLOW 0 . 89 MGI1
ULT . BOB OF WASTE : 23 . MG/L
MAX
AX TIDAL : 0 . 1212 KNOTS
ADVEC -SECTION AREA : 320 . 07 SOFT . n
AI�VECTIVE: VEL . : U . 07 MI/DAY "a)-
DISPERSION : 0 , 12 so . MI . /DAY r�� z
K1 0 . 53 PER DAY yK' �
t:2 0 . 44 PER DAY
BOB AT OUTFALL = 3 . 13421624047 MG/L . (�` �z �' �✓Nv�QI' •"�L
D . G . AT OUTFALL = 4 .4584698'2686 MG/t. F ��'
MILEPOINT UPSTREAM DOD UPSTREAM D . O . 4 V_
0 . 00 3 . 13 4 . 46 �
MILEPOINT DOWNSTREAM BOD DOWNSTREAM DO
0 . 00 3 . 13 4 . 46
0 . 10 2 . 61 4 . 44
0 , 20 2 . 17 4 . 47 y, � H
0 . 30 1 .81 4 . 54
0 . 40 1 .51. 4 . 63 33
0 .50 1 . 25 4 . 73
0 . 60 1104 4 , 84
0 . 70 0 , 87 4 . 96
0 . 80 0 . 72 5 , 07
0 . 90 0 . 60 5 . 18
1 &0 0 . 50 5 , 28
1 . 10 0 . 42 5 , 38
1 . 20 0.35 5 « 47
1 . 30 0 . 29 5 . 55
1 . 40 0 . 24 5 . 63
1 . 50 0 . 20 5. 69
THE WASTELOAD ALLOCATION FOR HAVELOCK WWTP 13 23 MG/L

DISCHARGER HAVELOCK WWTP
?TAME OF ESTUARY E PRONG SLOCUM CREEK
DEPTH : 5 . 00 FEET
WIDTH : 65 , 00 FEET
VOLUME 2 . 574E+006 CUBIC FEET
FRESHWATER INFLOW : 0 . 00 CFS
WASTEWATER FLOW : 1 . 06 MGD
ULT . POD OF WASTE : 23 . 00 MG/L
MAX TIDAL.. VELOCITY : 0 . 12 KNOTS
CROSS-SECTI:DN AREA 325 . 00 SQ , FT ,
ADVECTIVE VEL . : 0 . 08 MI/DAY
DISPERSION : 0 . 12 SQ . MI . /DAY
KI : 0 . 53 PER DAY
K2 : 0 . 44 PER DAY
POD AT OUTFALL 3 . 72937807137 MG/L .
D . O . AT OUTFALL = 4 . 14287536106 MG/L
MILEPOINT UPSTREAM BOD UPSTREAM D . O .
0 . 00 3 .73 4 , 14
MILEPOINT DOWNSTREAM BOD DOWNSTREAM DO
0 . 00 3 . 73 4 , 14
0 . 10 3 . 12 4 . 1I.
000 2 . 61 4 , 14
0 . 30 2 . 18 4 . 21.
0 . 40 1 . 83 4 .30
0 . 50 1 . 53 4 . 42
0 . 60 1 . 28 4 . 55
0 . 70 1 . 07 4 . 68
0 . 80 0 . 89 4 . 81
0 . 90 0 . 75 4 . 93
1 . 00 0 . 63 5 . 06
1 . 10 0 . 52 5 . 17
1 . 20 0 . 44 5 . 28
1 . 30 0 . 37 5 . 38
1 . 40 0 . 31 5 . 47
1 . 50 0 . 26 5 . 55
J
THE WASTELOAD ALLOCATION FOR HAVELOCK WWTF IS 23 MG/L.