NC0026611_Wasteload Allocation_19920514

NPDE:i DOCUMENT SCANNINC COVER SHEET
NC0026611
Morehead City WWTP
NPDES Permit:
Document Type:
Permit Issuance
/ste1oad
Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Correspondence
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
May 14, 1992
This document is printed an reuse paper - ignore any
content on the reirerse side

DRAFT R EQ U ESIESw.shwao
PERMIT NO.: NC0026611
PERMITTEE NAME: Town of Morehead City / Town of Morehead
a4lJIA) T
Facility Status: Existing
Pemut Status: Renewal
Major N'Iinor
Pipe No.: 001
Design Capacity: - 3.4-MGD—
Domestic (% of Flow): 100 %
Industrial (% of Flow):
Comments:
pretreatment information attached - no SIU's. Flow is at 2.7 MGD. A
flow increase above 1.7 MGD was denied last time according to the
town, and plant improvements were called a modification.
RECEIVING STREAM: Calico Creek
Class: SC
Sub -Basin: 03-05-03
Reference USGS Quad: I 32 NW (please attach)
County: Carteret
Regional Office: Wilmington Regional Office
Previous Exp. Date: 10/31/91 Treatment Plant Class: Class III
Classification changes within three miles:
Requested by: Rosanne Barons Date: 2/20/91
Prepared by:
Reviewed by:
Qt�
I iI . S (5) 35 (u.)
\\IQ
6-
Date:
Date: 5(11-
91-
Modeler
Date Rec.
#
2-c.v..
z(zo( t
fao
0
Drainage Area (mil )
Avg. Streamflow (cfs): -Fdal
7Q10 (cfs) Winter 7Q10 (cfs)
Toxicity Limits: IWC
Instream Monitoring:4"
Parameters imp tiro
Upstream
Downstream
F1'cUErrtI:
%
30Q2 (cfs)
Acute/Chronic
reCcdCc t,brrn Coc,rchyri�
3 /wee t.
r7 ,E
rrn_r•
•
Location CGtrco Cc ai• Rri-trriSe Lizf, b-loTP
LocationCciico Cie. C.+ P,cr6b,f3r.
I Iweek ,n
„rater
y d)
eJ:
i
1f o�}
,-J ,)
he ice. t, 1 '-huhrr ,
Comments: } ogre (i- end") z`A'.rne cfnci noJ th . u • ,
r^b�uvr,LLt '7t� :rt 4r>r le`r,�7 pi-1 ('.i'lI -Ce iP TnI be. of A l ig
a rnpled cocc (Y oeet) Pin Ct.nd {1 P raid o�'1Ce be1weerl i ram
50 ? at' •n{Ji,r tee , 3icFF c�cw;e rc 'Jtr1 �.1 tG�iCi r x� .
�
r el..7re{{ ref LGLF'r �+:L .f7.-w;t. .:lAr .�n'pfe -1-1r!1_,-) .
Effluent 04 = i.1
Characteristics m
Summer
Winter
BODS (mg/1)
024
30
NH 3-N (mg/1)
, q
NI L
D.O. (mg/1)
:,
J
TSS (mg/1)
. '
F. Col. (/100 nil)
p tr
pH (SU)
Zictuerlf iyx.-.;iTdlrlt
6 ttti- -t r
rllA<<t C111()r10
J
olonitanr ,^� PLTTED yca
aw
r
SVG.H,��pEth)rff) d,/urnc4
* rii adridicei b fie.
VD
Ciu.vrll% ter iTtxr
• .',4(1-4/ttf:. {4.>of ic::iai
Gr -N'te (.4.fx_ re.Crr1
'?Lt e. ihe_ [eMu il'Oi1
Degf doc rt:zirram
Yerord 44-e iiMPN.

WELCOME TO THE MOREHEAD CITY
WASTEWATER TREATMENT PLANT.
The average arson produces 100 - 170 gallons of wastewater per day.
The average ousehold produces 3,000 - 5,000 gallons of wastewater per
month. The astewater entering the treatmentplant is 99.9% water and
only 0.1% solid waste. The purpose of a wastewater treatment plant is
to remove the waste from the water and reduce its threat to the public
health. The Morehead City Wastewater Treatment Plant has a maximum
capacity of 2,700,000 gallons per day. The attached treatment plant
diagram will aid in understanding the flow and treatment of that
wastewater. `
The water coming into the plant (influent) undergoes pretreatment in
the GRIT REMOVER (1). The grit remover takes out the heavy coarse
material (sand, gravel, egg shells, etc.) from the wastewater. It
also aerates and freshens the water. A flow -measuring device is
installed at this point to record the volumeand rate of water
entering the plant. The water then flows to a SPLITTER BOX (1A) which
divides the flow between the two PRIMARY CLARIFIERS (2). In the
primary clarifier it undergoes primary treatment. The clarifier
allows oil, rease and other very fight materials to float to the
water's surface and be removed by a skimmer arm. The insoluble
materials settle to the bottom of the clarifier and are pumped to the
digesters. The water then flows on to the TRICKLING FILTERS (3) where
it undergoes Isecondary treatment. Secondary treatment is a biological
process whereby millions of. micro-organisms consume and stabilize the
organic material in the water. The slime on the trickling filter
media is produced by the micro-organisms as they feed and grow. From
the trickling filter, the water flows into the SECONDARY CLARIFIERS
(4). Insoluble material and any slime which has sloughed off the
trickling filter media is allowed to settle in these clarifiers and is
pumped to the digesters. The last stop in the treatment process is
the CHLORINE CONTACT CHAMBERS (5). Here chlorine is added as a
disinfectant before the treated water (effluent) is discharged into
the receiving stream. One ton cylinders of chlorine gas and the
chlorinating equipment are .located in the CHLORINE BUILDING (6). The
pumps which recirculate, water through the trickling filter and other
pumps which carry sludge to the digester are located in the PUMP
BUILDING (9).
The sludge pumped from the bottom. of the clarifiers is deposited in
the DIGESTERS (7). The materials in the sludge are further broken down
by micro-organisms. The "digested" sludge finally contains materials
which cannot be decomposed any further. This sludge is spread on the
SAND DRYING BEDS (8) . Here the waste is allowed to dry before it is
taken to a landfill.
The SHOP BUII:DINGS (11) contain spare parts, tools and other equipment
necessary for', maintenance and repair of all treatment plant equipment.
The primary objective is to keep the plant running efficiently. All
treatment processes are monitored in the.WASTEWATER LABORATORY (10).
Samples of 1nfluent and effluent waters are. collected daily and
brought here for analysis.
446

10
•
•
11 •
MOREHEAD CITY
WASTEWATER TREATMENT PLANT
lA
INFLiJ&NT
• no•102
9
5
EFFLUENT
discharge
no.103
NPDES PERM1NO.
NC0026611

DISCHARGE SERIAL NUMBER
14. Description of Influent and Effluent (see Instructions)
Parameter and Code
214
Flow
Million pallors per day
50050
pH
Units •
00400
Temperature
F
74028
(winter) •
Tempnature (summer)
F
74027
Fecal Streptococcl Bacteria
Number/100'm1
74054
(Provide if available)
Fecal Coliforin Bacteria
Number/100 m1
74055
(Provide if available)
Total Coliiforfin Bacteria
Number/100 ml
74056
(Provide if available)
BOD Sday
mill
00310
Chemical Oxygen Demand (COD)
mg/1
00340
Qsovide if available)
OR
Total Otpnic Carbon (TOG)
ssag/l
00630
(Provide if available)
(Either analysis u acoeptabk)
CAbrine—Toti1 Residual
50060
Influent
(1)
184.6
0.995
17.4
25.3
24.52
1.09
0.865
7.42
14.4
23.4
9.88
0.31
Silkiest
(5)
1.142 cont.
7.68 5/7
22.5 5/7 .
26.9 5/7
106.6
31.00
2.69
5/7
5/7
7/7
FOA AGENCY UU
365
260 G
260 G
260 G
260 G
260 24
365 G
u•5

Reported
as
Total
Nitrogen
00600
DISCHARGE SERIAL NUMBER
14. Dsss$pthsn of tefleNnt sod Moot (as Mstructloes) (CoMlnwd)
Parameter and Code
Total Solids
mg/1
00500
Total Dissolved Sobds
mg/1
70300
Total Suspended Solids
mg/1
00530
Settleable Matter (Reidue)
• m1/1
00545
Ammonia (u N)
m j/l
00610
(Provide if available)
JCjeldahl Nitrogen
mg/1
00625
(Provide if available)
Nitrate (as N)
eeu/i
00620
(Provide if availabkt
Nitrite (si N)
-1
00615
(Provide if available)
Pbospborus Total (u Pj
nig/1
00665
(Provide i( available)
Dissolved Oxygen (DO)
min
00300
FOR AGENCY USE1
Influent i Effluent •
(1)
<>
(2)
ill i
<
(3)
i
a
1 i
Z<
(4)
• 1111
(S)
(6)
Sample Type
1
1,424
943
564
1926
1/30
12
24
'163.8
17.25
13.04
23.84
- 5/7
260
24
0.5
Z 0.5
4 0.5-
5/7
260
G
.16.74
4
5.00
1.08
8.93
1.
- /30
12
24
1/
30
12
24
21.05
14.80
4
•
32.50
1/30
12
,
24
1/30
12
24
3.42
1.90
5.46
/30
12
24
7.00
6.40
8.48
•
5
/7
260
G
440

NPDES PRETREATMENT INFORMATION REQUEST FORM
FACILITY NAME: 7k,.nn NPDES NO. NCOO a ao ao l
REQUESTER: ,o,C11) DATE: a / f013'/ y/ REGION: a
PERMIT CONDITIONS COVERING PRETREATMENT
This facility has no SIUs and should not have pretreatment language.
This facility should and/or is developing a pretreatment program.
Please include the following conditions:
Program Development
Phase I due / /
Phase II due / /
Additional Conditions
(attached)
This facility is currently implementing a pretreatment program.
Please include the following conditions:
Program Implementation
Additional Conditions
(attached)
SIGNIFICANT INDUSTRIAL USERS' (SIUs) CONTRIBUTIONS
SIU FLAW - TOTAL:
- CDMPOSITION:
MD
TEXTILE: MGD
METAL FINISHING: MGD
OTHER: MC0
MGD
MGD
MGD
FEADWk)RRS REVIEW
PARAMETER
Cd
Cr
Cu
Ni
Pb
Zn
CN
Phenol
Other
PASS
:THROUGH DAILY LOAD IN LBS/DAY ACTUAL
ALLOWABLE DOMESTIC PEF T'ritz) INDUSTRIAL % REMOVAL
RECEIVED: L I 0 / 9/ REVIEWED BY:
RETURNED: (

Facility Name:
NPDES No.:
Type of Waste:
Facility Status:
Permit Status:
Receiving Stream:
Stream Classification:
Subbasin:
County:
Regional Office:
Requestor:
Date of Request:
Topo Quad:
FACT SHEET FOR WASTELOAD ALLOCATION
Morehead City WWTP
NC0026611
Domestic - 100%
Existing
Renewal
Calico Creek
SC
030503
Carteret
WiRO
Barona
02/20/91
I32NW
Request # 068
Stream Characteristic:
USGS # Tidal
Date:
Drainage Area (mi2):
Summer 7Q10 (cfs):
Winter 7Q10 (cfs):
Average Flow (cfs):
30Q2 (cfs):
IWC (%):
1992
^ Rfonal Office
prim
Wasteload Allocation Summary
(approach taken, correspondence with region, EPA, etc.) it
Facility had been bypassing wastewater during rainfall events. Expanded WWTP to address e =�
problem. Therefore design flow of plant is now 3.4 MGD, but ATC authorized for 1.7 MGD.
Level C analysis was performed as part of Carteret County EIS which indicated that plant removal% r o7'
would be best for stream and if not feasible should meet advanced tertiary limits w/nutrient
removal. Since much of plant is new, it was decided in meeting to renew permit at existing limits
(except hold flow at 1.7 MGD) and increase instream monitoring. In addition, region will write
letter to facility informing them that more advance limits may be required at the ne rmit renewa;N.) �a
and that their design flow will be frozen at 1.7 I1�1UD. Ti as dition, we recommend them removing ,
discharge.
Special Schedule Requirements and additional comments from Reviewers:
Recommended by: 2.11 C_ LJ(24CLk Date: o? I I I q Q
Reviewed by
t: �._,y Date: 2-
Regional
Supervisor:
Permits & Engineering:
Date:
Date:
,36-9
MAR 2 3 i99z
RETURN TO TECHNICAL SERVICES BY:

2
Existing Limits:
Wasteflo (MGD):
BOD5 (mg/I):
NH3N (mg/1):
DO (mg/1)':
TSS (mg/1):
Fecal Col. (/100 ml):
pH (SU):
Residual Chlorine (14/1):
Oil & Grease (mg/1):
TP (mg/1):
TN (mg/1):
Recommended Limits:
Wasteflo (MGD): 6
BOD5 (m ):
NH3N (m )• c)"�
DO (mg/I)
TSS (mg/1) : 2
Fecal Col. (/100 ml):
pH (SU):
Residual hlorine WA):
TP (mg/1):
TN (mg/1):
Toxicity Limits
CONVENTIONAL PARAMETERS
Monthly Average
Summer Winter
3.4 3.4
24 30
19 NL
5 5
30 30
86 86
6.8-8.5 6.8-8.5
monitor monitor
monitor monitor
monitor monitor
Monthly Average
Summer Winter WQ or EL
1.7 1.7
24 30
19 NL
5 5
30 30
86 86
6.8-8.5 6.8-8.5
Monitor Monitor
Monitor Monitor
Monitor Monitor
Acute qtrly pass/fail mysid shrimp (see attached)
Limits Changes Due To: Parameter(s) Affected
Change in Q10 data
Change in tream classification
Relocatio of discharge
Change in wasteflow
Other (onsite toxicity study, interaction, etc.)
Instream data Wasteflow
New regulations/standards/procedures
New facility information
_x Parameter(s) are water quality limited. For some parameters, the available load capacity of
the immediate receiving water will be consumed. This may affect future water quality based
effluent limitations for additional dischargers within this portion of the watershed. (Note: instream
data indicate no new dischargers should be allowed).
OR
No parameters are water quality limited, but this discharge may affect future allocations.

3
(PAeidot ,(74%,„4")
-
INSTREAM MONITORING REQUIREMENTS
Upstream Location: Calico Creek at first bridge crossing upstream of WWTP
Downstream Location: Calico Creek at Piggotts Bridge
Parameters: Temperature, DO, fecal coliform, conductivity
Special intream monitoring locations or monitoring frequencies: 3x /week summer; weekly winter
In addition to the above monitoring, the faciity shall perform diurnal DO sampling every hour over a 24
hour period one time per month during April to October at the upstream and downstream sampling sites l;s+'
above. T1e facility shall record the times of high and low tide times for each day as well as establish a st44
gage at each site. On the same day as the diurnal D(,sampling, temperature, pH, chloropi
and total nitrogen should be sam led etween the hours of 8 and 1 AM an
cd/ an 5 PM at
phosphorus, g P sw,
sampling sites. Staff gage readings should also be recorded at each of theses.
Special condition should be included on the monitoring page which states that Division water
quality studies indicate DO standard violations. Therefore, instream monitoring required to
establish larger baseline and will be used to evaluate permit limits and alternatives to discharge at
the next p�rmit renewal.
MISCELLANEOUS INFORMATION & SPECIAL CONDITIONS
Adequacy of Existing Treatment
Has the fa 'lity demonstrated the ability to meet the proposed new limits with existing treatment
facilities? Yes No
If 7o, which parameters cannot be met?
Would a "phasing in" of the new limits be appropriate? Yes No
If yes, please provide a schedule (and basis for that schedule) with the regional
office recommendations:
If no, why not?
Special Instructions or Conditions
Wasteload sent to EPA? (Major) (Y or N)
(If yes, then attach schematic, toxics spreadsheet, copy of model, or, if not modeled, then old
assumptions that were made, and description of how it fits into basinwide plan)
Additional Information attached? _N (Y or N) If yes, explain with attachments.

Facility Name Movie ito ad COki Permit # NCOUPtal 11 Pipe # 00(
ACUTE TOXICITY PASS/FAIL PERMIT LIMIT (QRTRLY)
The permittee shall conduct acute toxicity tests on a quarterly basis using protocols defined in the North Carolina
Procedure Document entitled "Pass/Fail Methodology For Determining Acute Toxicity In A Single Effluent
Concentration." The monitoring shall be performed as a Mysidopsis bahia 24 hour static test, using effluent
collected as a 24 hour composite. The effluent concentration at which there may be at no time significant acute
mortality is 90% (defmed as treatment two in the North Carolina procedure document). Effluent samples for self -
monitoring purposes must be obtained during representative effluent discharge below all waste treatment. The
first test will be performed after thirty days from the effective date of this permit during the months of
Feb rrrA,� AcNov
All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge
Monitoring Form (MR-1) for the month in which it was performed, using the parameter code TGE3E.
Additionally, DEM Form AT-2 (original) is to be sent to the following address:
Attention: Environmental Sciences Branch
North Carolina Division of
Environmental Management
4401 Reedy Creek Road
Raleigh, N.C. 27607
Test data shall be complete and accurate and include all supporting chemical/physical measurements performed in
association with the t xicity tests, as well as all dose/response data. Total residual chlorine of the effluent toxicity
sample must be meas and reported if chlorine is employed for disinfection of the waste stream.
Should any single quarterly monitoring indicate a failure to meet specified limits, then monthly monitoring will
begin immediately til such time that a single test is passed. Upon passing, this monthly test requirement will
revert to quarterly in a months specified above.
Should any test data m either these monitoring requirements or tests performed by the North Carolina Division
of Environmental Management indicate potential impacts to the receiving stream, this permit may be re -opened and
modified to include alternate monitoring requirements or limits.
NOTE: Failure to ac ieve test conditions as specified in the cited document, such as minimum control organism
survival and appropriate environmental controls, shall constitute an invalid test and will require immediate
retesting(within 30 days of initial monitoring event). Failure to submit suitable test results will constitute
noncompliance with monitoring requirements.
7Q10 Tda l cfs
Permitted Flow lei MGD
IWC %
Basin & Sub -basin WOk.O3
Receiving Stream cb1 c() Cree
County Co d ere t
Recommended by:
Date al ICI 1Ga
stdcuitt,k_
QAL PlF Mysid 24 Version 9/91

STREAM DATA
INSTREAM SELF -MONITORING DATA
MONTHLY AVERAGES
Discharger: or4head Ct Permit No. P.1C-002Vu1I
ReceivingStream: Sub -basin: L
C',a t� co �e� Cn loco Crete
Upstream Location: 2,14-6p; rettirt4yticwosivti Downstream Location: C , 204" 51-,
DATE
Dec-91
Nov-91
Oct-91
Sep-91
Aug-91
JuI-91
Jun-91
May-91
Apr-91
Mar-91
Feb-91
Jan-91
Dec-90
Nov-90
Oct-90
Sep-90
Aug-90
Jul-90
Jun-90
May-90
Apr-90
Mar-90
Feb-90
Jan-90
Dec-89
Nov-89
Oct-89
Sep-89
Aug-89
JuI-89
Jun-89
May-89
Apr-89
Mar-89
Feb-89
Jan-89
Min t)
D.O. eer. FECAL COLT.
it', ID
$.DO
Q . (7
1415
1.t.8 5
4 (..Q
11.12
/44%5
ki„ 1
D3.y
4.S-3
I.3
0(4,1
3.70
42N,/
Q4--.9-
0.15
O.4
a3. 83
3,07
1, 3
piU
0.10
0.((1
Ia.'
150
6, Kt
3 q
ia.00
-115
5N c
9.15
1.o
t2
la
'7.1
EA)
12.25
7.42
5.g
15. Co
8.41'5
4.3
,q.
S'
,2. 04
O.'
Ifox : 4.1
c
.5
a.8.1
1 .4l
Uoa'=1,.2
Pisue-4
cQG.'J
3.14
D.2.
5.45
a. ate
b.9
i4o v= 41.5
a2.D3
a.7Q.
1./
1 •M,2
ao
l'l
5.3
0.9
i-i 4/
16.2.
4.2t/
a•0
tlax.b.5
13.Liz
R.o tc
lc.3
9.rc
7.82.
Lt. .3
$.9
7•9 2
le.5
.
Mee. 4i!
TEMP
D.O.ahnDio
Cali FECAL CO
1/AO
g .,5 0
4A 0
ia.? 5
-)..5? a
Le .
4 3.41
5. 5-)
3. a
. S
1.3.
1.3
1, a.
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3-
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Ti.D.
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e )
1 ).. 3U
i.e.R
AD
ID . 5
1. 3-)
. ,1
q,Q5
c.5
--?,7'
a.ta.
8,c
0.3
12.12
-7.57
1:7
/3.C1.7
Gc.15
a
_n.'7
372
2.1e
35
.P1.1
'l.17
1, 3
?lax.G.3
a .7.4-/
a, 9 g
1,3
Maie 6.0
.24.12.
3.II
1.t
Has' 4.3
a3.
4. 27
3.2.
Mae s&J
al. a
3.9
027
1•lay.ti.o
to,9
0.4-10
3.0
?-bs6314
13.5
it.3n
lb./
9.L 2.
?.')6
1 7 .O
-7.g
g.4S'
Lc-2.
rnple3 Ict . pn'or to 9:00 AM
Page 1

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DIVISION OF ENVIRONMENTAL MANAGEMENT
February 10, 1992
MEMORANDUM
To: Steve Tedder urigina! Signed By
From: Preston Howard PRESTON HOWARL, 1k
Subject: Town of Morehead City
NPDES Permit No. NC0026611
Effluent Limitations
Carteret County
CEIVE
FEB 1 2 1992:
JEetir c4L Sal?POR7 BRANCH
I would like to request an in-house meeting be scheduled to
include you, Technical Support, Permits and Engineering, and
regional personnel to discuss final effluent limitations for the
Town of Morehead City. The possibilities which come to mind are
as follows: reissuance with the existing limitations at 1.7 MGD
with a provision the facility cannot be expanded; reissuance with
existing limitations at 1.7 MGD with more stringent limitations
to take place when the permit is reissued (next permit cycle);
reissuance with existing limitations at 1.7 MGD and more
stringent limitations if/when the facility is allowed to expand
to 2.0 MGD or 3.4 MGD.
One issue which may be raised by the Town and which may need
a legal interpretation is NCGS 143-215.2 (al)(d) which seems to
indicate that more stringent limitations cannot be applied to a
person that has constructed facilities under a compliance order,
if:
1. the treatment works alleviated the water pollution to the
extent required by the order/permit, and
2. such person has complied with the terms and conditions of
the order/permit.
The enlarging of the capacity at the facility did eliminate the
noncompliance issues identified in the Order.
After the Division's position relative to the discharge from
Morehead City's wastewater treatment plant has been determined;
the Regional Office staff will, if necessary, hold a meeting with
Town Officials to discuss the Division's position.
I would suggest a meeting date on either February 19 (AM),
20 (AM), 25 (PM), or 26 (PM).
Please advise if you have any questions or need additional
information from this Office.
cc:
Trevor Clements
Don Safrit
Wilmington Regional Files

To: Perm
Wate
is and Engineering Unit
Quality Section
Date: February 7, 1992
NPDES STAFF REPORT AND RECOMMENDATION
County: Carteret
Permit No. NC0026611
REVIEW ENGINEER: Rosanne Barona
PART I - GENERAL INFORMATION
1. Facil
ity and Address:
Town of Morehead City
Morehead City Wastewater Treatment Plant
Post Office Drawer M
More ead City, North Carolina 28557
2. Date of Last Inspection: May 1, 1991
3. Report Prepared by: Dave Adkins
4. Persons Contacted and Telephone Number:
Mr. Joe Clayton, ORC
919/726-5022
5. Directions to Site: Travel north from Arendell Street on
Crab Point Road (NCSR 1176) across Calico Creek. Turn left
on Lopp Road (NCSR 1179) and travel approximately 0.5 mile,
turn left on Treatment Plant Road. The wastewater treatment
plant is located at the terminus of this road.
6. Discharge Point: Latitude: 34° 43' 55"
Longitude: 76° 44' 15"
USGS uad No. I 32 NW USGS Quad Name: Beaufort
7. Size: There is limited land available for expansion and/or
upgrading at the present plant site.
8. Topography: The site is located adjacent to Calico Creek.
The elevation of the site is approximately 8' msl.
9. Location of nearest dwelling: There is an apartment complex
located within 500 feet of the plant.

10. Recei
ing stream or affected surface waters: Calico Creek
a. lassification: Class "SC" waters.
b. iver Basin and Subbasin No.: 030503
c. Describe receiving stream features and pertinent
downstream uses: Coastal stream with limited flushing.
Downstream waters (approximately 1.53 miles) are
classified "SA" and are utilized for commercial
shellfishing.
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. Type of wastewater: 100% Domestic
a. Volume of Wastewater: Dual train facility (1.70 MGD per
rain) is on line.
b. Types and quantities of industrial wastewater:
None at this time.
c. Prevalent toxic constituents in wastewater: Chlorine
d. Pretreatment Program is not required.
2. Type of treatment: The existing wastewater treatment
facilities consist of aerated grit removal, flow splitter
box, dual primary clarifiers, dual trickling filters, dual
secondary clarifiers, gaseous disinfection facilities
(chlorine), chlorine contact chamber, and post aeration.
5. Sludger handling and disposal scheme: The sludge is
stabs ized in aerobic digesters, dewatered on sludge drying
beds, and disposed of in the County landfill. The Town has
recently developed criteria for a land application program.
Bio Gro has filed a nondischarge permit application to land
apply the sludge from the Town's wastewater treatment plant.
6. Treatment plant classification: Class III facility
presently, will become a Class IV plant when the land
application of sludge permit (WQ0006018) is issued.
7. SIC Code: 4952
Wastewater Code: 01
Main Treatment Units: 40001
PART III -
OTHER PERTINENT INFORMATION
1. Is this facility being constructed with Construction Grants
Funds No
2. Special monitoring requests: It is recommended that the
draft permit be prepared with Class IV monitoring
requirements.

3. Additional effluent limits requests: None
PART IV - EVALUATION AND RECOMMENDATIONS
The Town's existing wastewater treatment facility is a high
rate trickling filter facility (dual path 1.7 MGD units) with
gaseous chlorination and post aeration. The second train was
constructed (completed December 20, 1991) to prevent bypassing
which routinely occurred in conjunction with significant rainfall
events. The presently permitted capacity is 1.7 MGD. The average
daily flow for the past twelve months was 1.173 MGD. The 2.497
MGD maximum daily flow reported for the same time period is 1.5
times the average daily flow. The solution the Town selected to
eliminate the sewage overflow has been effective.
The Town has indicated in their application that the
facility has a design capacity of 2.0 MGD. Any increase in the
permitted (design) capacity of the wastewater treatment plant
would be contrary to the Division's position of no expansion of
any POTW until a comprehensive EIS was completed. The recently
completed Carteret County Planning Document indicates there
should be no new or expanded discharges into the estuaries.
A comparison of the existing effluent limitations and the
effluent limitations proposed in the most recent evaluation by
the Technical Support Branch is shown below:
Parameter
Flow
BOD5
NH as N
Total
TSS
Dissol
Fecal
Total
Nitrogen
ved Oxygen
Coliform
Phosphorus
Existing, Proposed
Daily Average Daily Average,
1.7 MGD & 3.4 MGD 1.7 MGD
30 mg/1 5 mg/1
WPM
1 mg/1
30 mg/1 30 mg/1
5 mg/1 5 mg/1
86/100 ml 86/100 ml
0.05 to 0.10 mg/1
It would appear that prior to establishing such stringent
effluent limitations for Total Nitrogen and Phosphorus; the EMC
would need to consider a Nutrient Sensitive classification for
Calico Cre k. In addition, the Division of Marine Fisheries
considers he area one of the most productive primary nursery
areas in tIe region. Extending/relocating the discharge point
would be most difficult as the downstream waters (Newport River)
are classified as "SA" waters.

After the effluent limitations have been established, it is
recommended a draft permit be prepared and placed at public
notice which includes the final effluent limitations and any
restrictions determined by the Division to be appropriate for
this facility. If no significant adverse public comment is
received, it is recommended NPDES Permit No. NC0026611 be
reissued for a five year period.
Wa er Qualit Re.iona Supervisor
Regional Su rvisor
Date
NC26611.SR
cc: Wilmington Regional Files
Technical Support Branch
Central Files

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