NC0081736_Permit Issuance_19960610

State of North Carolina
Department of Environment,
Health and Natural Resources
Division of Environmental Management
James B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary
A. Preston Howard, Jr., P.E., Director
June 10, 1996
Mr. Wyatt E. Blanchard
New Hanover County Engineer
414 Chestnut Street, Room 101
Wilmington, North Carolina 28401
AC4 te
[DEHNR
Subject: NPDES Permit Issuance
Permit No. NCO081736
New Hanover County Airport W W TP
New Hanover County
Dear Mr. Blanchard:
In accordance with your application for discharge permit received on December 29, 1995,
we are forwarding herewith the subject state - NPDES permit. This permit is issued pursuant to
the requirements of North Carolina General Statute 143-215.1 and the Memorandum of Agreement
between North Carolina and the US Environmental Protection Agency dated December 6, 1983.
The following changes have been made from the draft permit that was sent to you..
• The upstream and downstream sampling locations have been changed to the same locations
as those of the Loughlin WWTP, specifically U - Upstream (U1 - Upstream in the NE
Cape Fear River at Hwy 421 crossing, U2 - Upstream at Muddy point) and D -
Downstream at Port Authority.
• The instream monitoring frequencies have been changed per T15A 2B .0508 regulations,
specifically upstream and downstream monitoring is to be conducted three times per week
during June, July, August, and September, and once per week during the rest of the year.
If any parts, measurement frequencies or sampling requirements contained in this permit
are unacceptable to you, you have the right to an adjudicatory hearing upon written request w-10hiii
thirty (30) days following receipt of this letter. This request must be in the form of a written
petition, conforming to Chapter 150B of the North Carolina General Statutes, and filed with the
Office of Administrative Hearings, Post Office Drawer 27447, Raleigh, North Carolina 27611
-7447. Unless such demand is made, this decision shall be final and binding.
Please take notice this permit is not transferable. Part H, EA. addresses the requirements
to be followed in case of change in ownership or control of this discharge. The Division of
Environmental Management may require modification or revocation and reissuance of the permit.
P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled / 109/6 post -consumer paper

June 10,1996
NPDES Permit Issuance
Permit No. NCO081736
Page 2
This permit does not affect the legal requirements to obtain other permits which may be
required by the Division of Environmental Management or permits required by the Division of
Land Resources, Coastal Area Management Act or any other Federal or Local governmental permit
that may be required.
If you have any questions concerning this permit, please contact Ms. Mary Cabe at
telephone number [phone], extension 518.
Sincerely,
Original Signed By
David A Goodrich
A. Preston Howard, Jr., P. E.
cc: Central Files
Wilmington Regional Office / Water Quality Section
Roosevelt Childress, EPA
Permits and Engineering Unit
Facility Assessment Unit
Aquatic Survey and Toxicology Unit

Permit No. NCO081736
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT, HEALTH, AND NATURAL RESOURCES
DIVISION OF ENVIRONMENTAL MANAGEMENT
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provision of North Carolina General Statute 143-215.1,
other lawful standards and regulations promulgated and adopted by the North Carolina
Environmental Management Commission, and the Federal Water Pollution Control Act, as
amended,
County of New Hanover
is hereby authorized to discharge wastewater from a facility located at
New Hanover County Airport WWTP
North 23rd Street near NHC Airport
Wilmington
New Hanover County
to receiving waters designated as the Cape Fear River in the Cape Fear River Basin
in accordance with effluent limitations, monitoring requirements, and other conditions set forth in
Parts I, H, III and IV hereof.
This permit shall become effective July 1, 1996.
This permit and authorization to discharge shall expire at midnight on June 30, 2001.
Signed this day June 10, 1996.
Original Signed By
David A Goodrich
A. Preston Howard, Jr., P.E., Director
Division of Environmental Management
By Authority of the Environmental Management Commission

Permit No. NC0081736
SUPPLEMENT TO PERMIT COVER SHEET
County of New Hanover
is hereby authorized to:
1. After receiving an Authorization to Construct from the Division of Environmental Management,
construct and operate a 4.0 MGD wastewater treatment facility located at North Side
Wastewater Treatment Facility, North 23rd Street near New Hanover County AIr}wrt,
Wilmington, New Hanover Count, (See Pan III of this Permit), and
2. Discharge from said treatment works at the location specified on the attached map into the Cape
Fear River which is classified Class SC waters in the Cape Fear River Basin.

226 227 57#301# -44 ef. f
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ROAD CLASSIFICATION
PRIMARY H,G^4*iklv LIGH7. -M7 Y ROA-Z' HARD OR
HARD SLJRFA'-'=- NPROVED S_'R-FACE
SE-CON3ARY ;:G-WAY
U.%,tVP,;C)VE� ROAD
Latitude 34014'29"- Longitude 77057'11"
Map# K27NW Sub -basin 030617
Stream Crass SC
Dis.c.harge. Class 100% Domestic
Receiving Stream Cape Fear River
Design Q 4.0 MQD- Permit expires 6/30/01_,
—
Wiwi
54!0.- IV 5"'
229 (CASTLE HAYNE) 730
slaw
owl 6-n In
.--
SCALE 1:24 000
0 1 MILE
a»arrazuwvaJoovor
0 9 7000 FEET
W �R
1 0 1 KILOMETEFF,
CONTOUR INTERVAL 5 FEET
QUAD LOCATION New Hanover County
NCO081 736
New Hanover County
Airport WWTP

A. O. EFI LLENT LIMITATIONS AND MONITORING REQUIREMENTS WINTER (November 1 - March 31) Permii No. NCO081736
During the period beginning on the effective date of the petmi! and lasting until expiration, the Permittee is authorized ut discharge from
outfall(s) serial number 001. Such discharges shall be limited and monitored by the permittee as specified below:
Effluent Characteristics
Discharge Limitations
Monitoring
Requirements
Measurement
Sample
*Sample
Monthly Avg.
Weekly Avg.
Daily Max
Frequency
Type
Location
Flow
4.0 MCD
Continuous
Recording
I or E
BOD, 5 day. 20*C**
10.0 mg/I
15.0 mg/I
Weekly
Composite
E, I
Total Suspended Residue"
30.0 mg/I
45.0 mg/I
(�z{(
Weekly
Composite
E. I
NH3 as N
Z 4.0 mg/I
Weekly
Composite
E
Dissolved Oxygen***
?
3/Week
Grab
E
Fecal Coliform (geometric mean)
200.0 /100 ml
400.0 /100 ml
Weekly
Grab
E
Total Residual Chlorine ""`
C3)'Vg/I
2/Week
Grab
E
Temperature, °C
Z
Daily
Grab
E
Total Nitrogen (NO2 + NO3 + TKN)
Monthly
Composite
E
Total Phosphorus
M �
Composite
E
y Lead _ a-)t
Monthly
Composite
E
* Sample locations: E - Effluent, I - Influent, U - Upstream
(U 1 - Upstream in the NE Cape
Fear River at Hwy
421 crossing, U2 - Upstream
at Muddy point), D - Downstream at Port Authority.
** The monthly average effluent BOD5 and Total Suspended Residue concentrations shall not exceed 15% of the respective influent value
(85% removal).
*** The daily average dissolved oxygen effluent concentration shall not be less than 6.0 mg/l.
**** Total Residual Chlorine limit will apply only in periods when chlorine is used for disinfection.
***** Acute Toxicity ( Fathead Minnow 24 Hour) P/F at 90%; March, June, September and December; See Part III, Condition F.
****** Upstream and Downstream monitoring is to be conducted three times per week during June, July, August, and September, and once
per week during the rest of the year.
The pH shall not be less than 6.8 standard units nor greater than 8.5 standard units and shall be monitored Weekly at the effluent by grab
sample.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
6
C(qj`U ate .

A. (). EFFLUENT LIMITATIONS AND MONITORING REQUIREMYNTS SUMMER (April 1 - October 31) Permit No. NC0►081736
During the period beginning on the effective date of the permit and listing until expiration, the Permittee is authorized to discharge from
outfall(s) serial number 001. (Continued)
Effluent Characteristics Discharge Limitations
Monitoring
Requirements
Units (sat ecify)
Measurement
Sample
*Sample
Monthly Avg, Weekly Avg.
Daily Max Freguency
Type
Location
Acute Toxicity*****
Quarterly
Composite
E
Dissolved Oxygen
* * * * * *
Grab
U. D
Temperature, °C
* * * * * *
Grab
U. D

A. ().EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS SUMMER (April 1 -October 31) Permit No. NC0081716
During the period beginning on the effective date of the permit and lasting until expiration, the Permittee is authorized to discharge trom
outfall(s) serial number 001. Such discharges shall be limited and monitored by the permirtee as specified below:
Effluent Characteristics Discharge Limitations Monitoring Requirements
Measurement Sample 'Sample
Monthly Avg. Weekly Avo, Daily Max Freauency Tvpe Location
Flow 4.0 Mt3D Continuous Recording I or E
BOD, 5 day, 200C'• 5.0 mg/I 7.5 mg/I Weekly Composite E, I
Total Suspended Residue" 30 0 mg/I 45.0 mg/I Weekly Composite E, I
NH3 asN I 2.0 g/I Weekly Composite E
Dissolved Oxygen— 3/Week Grab E
Fecal Coliform (geometric mean) 200.0 /100 ml 400.0 /100 ml Weekly Grab E
Total Residual Chlorine"" 13 µg/I 2/Week Grab E
Temperature, °C Daily Grab E
Total Nitrogen (NO2 + NO3 + TKN) Z� Monthly Composite E
Total Phosphorus Monthly Composite E
Lead Monthly Composite E
* Sample locations: E - Effluent, I - Influent, U - Upstream (UI - Upstream in the NE Cape Fear River at Hwy 421 crossing, U2 - Upstream
at Muddy point), D - Downstream at Port Authority.
** The monthly average effluent BOD5 and Total Suspended Residue concentrations shall not exceed 15% of the respective influent value
(85% removal).
*** The daily average dissolved oxygen effluent concentration shall not be less than 6.0 mg/l.
**** Total Residual Chlorine limit will apply only in periods when chlorine is used for disinfection.
***** Acute Toxicity ( Fathead Minnow 24 Hour) P/F at 90%; March, June, September and December; See Part III, Condition F.
****** Upstream and Downstream monitoring is to be conducted three times per week during June, July, August, and September, and once
per week during the rest of the year.
The pH shall not be less than 6.8 standard units nor greater than 8.5 standard units and shall be monitored Weekly at the effluent by grab
sample.
There shall be no discharge of floating solids or visible foam in other than trace amounts.

A. (). EFFLUENT LIMITATIONS AND MONITOR 1Nc i REQUIREMENTS WINTER (November 1 - March 31) Permit No. NCO081736
During the period beginning on the effective date of the permit and lasting until expiration, the Permittee i.s authorized to discharge from
outfall(s) serial number 001. (Continued)
Effluent Characteristics
Discharge Limitations Monitoring
Reguirements
Units (specify) Measurement
Sample,
`Sample
Monthly Avg. Weekly Avg. Daily Max Frequency
Type
Location
Acute Toxicity'"'
Quarterly
Composite
E
Dissolved Oxygen
* * * ' ' "
Grab
U, D
Temperature, °C
* * " * ' '
Grab
U, D

Part III
Permit No. NCO081736
F. 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 Fathead
Minnow (Pimephales promelas) 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% (defined 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 March, June, September and December.
All toxicity testing results required as part of this permitcondition will be entered on the Effluent
Discharge Monitoring Form (MR-1) for the month in which it was performed, using the parameter
code TGE6C. 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 toxicity tests, as well as all dose/response data. Total residual
chlorine of the effluent toxicity sample must be measured 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 until such time that a single test is passed. Upon passing, this
monthly test requirement will revert to quarterly in the months specified above.
Should any test data from 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 achieve 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.
G. Upon final site design, New Hanover County shall coordinate with the Department of Cultural
Resources to minimize the potential adverse impacts on the National Register - eligible New
Hanover County Prison Farm.

MTFM
NORTH CAROLINA DEPT. OF ENVIRONMENT, HEALTH AND NATURAL RESOURCES
ENVIRONMENTAL MANAGEMENT COMMISSION
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
APPLICATION FOR PERMIT TO DISCHARGE WASTEWATER
STANDARD FORM A - MUNICIPAL
SECTION I.
APPLICATION
AND FACILITY DESCRIPTION
Unless otherwise specified on this ions all items are to be completed. It an item Is not applicable indlcate'NA'.
ADDITIONAL INSTRUCTIONS FOR SELECTED ITEMS APPEAR IN SEPARATE INSTRUCTION BOOKLET AS
INDICATED. REFER TO BOOKLET BEFORE FILLING OUT
THESE ITEMS.
Please Pnnt or Type
1. Legal Name of Applicant
101
New Hanover County Water and Sewer District
(see instructions)
2 Mailing Address of Applicant
(see Instructions)
Number&Street
102a
414 Chestnut Street, Roan 101
City
102b
Wilmington '
State
102c
North Carolina
ZZp Code
102d
28401
3. Applicant's Authorized Agent
(see Instructions)
Name and Title
103a
Wyatt E. Blanchard, P.E.
New Hanover County Engineer
Number&Street
103b
414 Chestnut Street
City
1030
Wilmington
State
103d
North Carolina
Zup Code
103e
28401
Telephone
103f
[phone]
Area Number
4. Previous Application
Coda
If a previous application fora
permitunder the National
- Pollutant Discharge Elimination
System has been made, give
the date o1 application.
104
YR MO DAY
I certify that I am familiar with the information contained in this application and that to the best of my knowledge and belief such
information is true, complete, and accurate.
Wyatt E. Blanchard, P.E.
Printed Name of Person Signing
6V
Signature of Applicant or Authorized Agent
North Carolina General Statue 143.215.6 (b)(2) provides that:
representation, or certification in any application, record, repor
Article 21 or reaulations of the Environmental Management C
or Known y renders inaccurate any mootar
21 or re u allons of the Environmental Mani
punishable by a fine not to exceed $10,000, ,
provides a punishment by a fine or not more
102e New Hanover County Engineer
S.( Title
1021 / .,)2 z
YR MO DAY
Date Application Signed
person who Imowirgly makes any false statement
n, or other document files or required to be maintained under
fission implementing that Article, or who falsifies, tampers with,
a or method required to be operated or maintained under Article
implementing that Article, shall be gguilty or a misdemeanor -
to exceed six months, or by both. (13 U S.C. Section 1001
:onment not more than 5 years, or bbooth, for a similar offense.)

R FUR AUF-NL;Y 5 Ir
J - ]i
5.
l A..
Facility (see instructions)
Give the name, ownership, and
physical location of the plant or
other operating facility where
discharge(s) prmndy occurs)
or YAII occur.
Name 105a New He -mover Countv Water and Sewer District
Waste Water Treatment Plant
Ownership (Public, Private
or both Public and Private) 105b PUB PRV OPP
Check block if a Federal FED
facility 105c
and give GSA Inventory
Control Number 105d N/A
Location:
Number & Street 1058 North 23rd Street near NHC Airport
city 105f -Wilmington
County 105g New Hanover
state 105h -North Carolina
*Construction may take place on City Of. Wilmington
6. Discharge to �Another Municipal Northside WWTP.
Facility (see instructions)
a. Indicate if part of your discharge 106a Yes E*No
is into a municipal waste trans-
port system under another re-
sponsible organization: If Yes,
complete the rest of this item
and continue with item 7. if no,
go directly to item 7.
b. Responsible Organization
Receiving Discharge N/A
Name 106b
Number& Street 106c N/A
city 106d N/A
State 106e N/A
Zp Code 106f N/A
• c. Facility Which Receives 106g N/A
Discharge
Give the name of the facility
(waste treatment plant) which re-
places and is ultimately respon-
sible for treatment of the
discharge from your facility.
d. Average Daily Flow to Facility 106h 0.0 ---mgd
7. Facility Discharges, Number and
Discharge Volume (see instructions)
Spa* the number of discharges
described in this application and the
volume of water discharged or lost
to each of the categories -below.
Estimate average volume per day in
million gallons per day. Do not include
intermittent or nonoontinuous,
overflows, bypasses or seasonal dis-
charges from lagoons, holding
ponds, etc.

. L �•
hC ba
To: Surface Water
Surface Impoundment with
no Effluent
Underground Percolation
Well (Injection)
Other
Total Item 7
If'othee is specified, describe
If any of the discharges from this
facility are intermittent. such as from
overflow or bypass points, or are
seasonal or periodic from lagoons,
holding ponds, eta, oompiete item 8.
8. Intermit Discharges
a. Facility bypass points
indicate the number of bypass
points for the facility that are
discharge poins.(see instructions)
b. Facility Overflow Points
Indicate the number of overflow
points to a surface water for the
facility (see instructions)
c. Seasonal or Periodic Dischasg� _
Pons Indicate the number O
.:.a Y.:.c? sedsJ.:Gi +:szna.—�es
occur from holding ponds
lagoons. etc.
9. Collection System Type
Inol:,atr the type and length (in
mites; of the collection system used
by this facility. (see instructions)
Separate Storm
Separate Sanitary
Combined Sanitary and Storm
Bc,0 Separate Sanitary and
Combined Sewer Systems
Both Separate Storm and
Combined Sewer Systems ,
10. Municipalities of Areas Served
(see instructions)
Total Population Served
107a1
107b1
107c1
107d1
107e1
10711
107g1
Number of
Discharge Points
1 107a2
107b2
107c2
107ct2
107e2
�- 107f2
10 a N/A
108,
N/A
108c
N/A
.109a
11111007.
110a
1103
110a
110a
110a
Total Volume Discharged,
Million Gallons Per Day
4.0
❑ SST
Ej SAN
❑ CSS
❑ BSC * mreaimtent Plant and collection system
is being designed. Approximately 59
❑ SSC miles of sewers will* be sri.fted from
* Wilminaton's Sout.hside VVTP and tvvro
miles package plants to tha.s plant.
Actual Population
Name Served
krea of. New N ver job 22,800
2ounty extendix cr 11ab
from Tr'j.lmingto 11cb
-ity 1 inIts no h t 10b
Find east to th 110b
Pender_ County 110c
line.

I-UH AGt:N(;Y USE
11. Average Daily Industrial Flow
Total estimated average daily waste ill 0 mgd
flow from all industrial sources. I I
Note: AA major industries (as defined in Section IV)
discharging to the municipal system must be
listed in Section IV.
12 Permits, Licenses and Applications
List all existing, pending or denied permits, licenses and applications related to discharges from this facility (see
instructions)
3.
For
Agency
Use
T
P=itoofr
License
ID Number
Date
Filed
YR/MO/DA
te
Issued
YR/MO)//nDA
DaL
D�)n
/M 0/
YR /OA
Diration
Date
YR/MO/DA,
11111mumill
13. Maps and Drawings
Arz--h all required maps and drawings to the back of this apprication. (see instructions)
14. Additional Inforriiation
trn
-T
e
Number
14
Information
Discharge point to be adjacent to the City of Wilminc
northside discharge. Discussions are taking place wi
the Ci-ty to use same discharge. Treatment plant is r
being designed.
ton 1 s
th
OW
t

•FUR AGENCY5c
STANDARD FORM A - MUNICIPAL
SECTION Il.
Complete this section for each present or propose
Includes discharges to other municipal sewerage
being discharged to surface waters. Oischarges I
this facility. Separate descriptions of each disch
for an existing discharge should be representative
should reflect best engineering estimates.
ADDITIONAL INSTRUCTIONS FOR SELECT
INDICATED. REFER TO BOOKLET BEFORE
1. Discharge Serial No. and Name
a Discnarge Seral No.
(see instructions)
b. Discharge Name
Give the name of discharge, if
any (see inst:.:c:ions)
c. Previous Discharge Seral No
If a previous NPOES permit
acplication was mace for this dis.
cnarre (I',am -. S octior, l) provide
previous discharge serial
nun. r.
2 0:sc=arge Oraa::ng Dates
yin Dace
If n e d,scia me `:as never
e.; -_,f7e : bu: s Planned for some
fL ure ca:e, a^:e 6:e date the
r,
c.scha-_e •ti,J be -in.
b 0;s:.ha_ a :o End Da'e If cue
d s_^a=x• :s sched— !ed to be
C Le nez: 5
yea-, g. a '+e da!e (vt."Tin ems:
es: " e:e —e :.Zschame w.11 sn'
G:ve 'A-2;On for dis:o;anuing
tr..s :s.^.'a ye in item 17.
3. 0!sChztee _xa_1.:n Name the
C3: _:a 0s w. in wt:rcn
C:e of z5schd ye is located.
Sza:e
G. .! `y
(If aY::l.zable; City or Town
4. Discharge Point Description
(see instructions)
Oiscna a into (check one)
S:: eam (includes ditches, arroyos,
and oc a watercourses
Estuary
Lt- e
Ccaan
V. --II jinlec:lOn)
Omer
If other is checked, specify type
S. D, x'ta: _e Point - LPL Long.
S:::o - e pre :se Iccah.on of the
F: d:scharw :o wa ne-3 st
se--oni (xe instructions)
ls:a:1:
L•.ny. j•}:
BAST
�d discharg
systems In
o welts mu
trge are re,
i of the twe
ED ITEMS
FILLING
1 201a
2'01 b
201 c
203a
21-",b
203E
204a
0 DISCHARGE DESCRIPTION
a Indicated In Section I. items 7 and 8, that Is to surface waters. This
which the waste water does not go through a treatment works prior to
st be described where there are also discharges to surface waters from
quired even I several discharges originate In the same facility. All values
Ive previous months of operation. If this Is a proposed discharge, values
APPEAR IN SEPARATE INSTRUCTION BOOKLET AS
DUT THESE: ITEMS.
001
Cape Fear River below the confluence with
Northeast Cape Fear.
N/A
98 01
Yn &
N/A
YR •MO
Agency :use
North Carolina 203d
New Hanover. 2e
Wi lminaton 203f
Surface water - continuous
® STR
❑ EST
❑ LC-
OCE '
❑ WEL
❑ OTH
20-2b
205a 3 4 _DEG. ! MIN. 2 8 SEC
2OSb 78 DEG. 5 7 MIN. 12 SEC

111111111
DISCHARGE SERIAL NUMBER
001.
a Discharge Receiving Water Name Ca Fear River
Name the waterway at the point of 206a ?e
discharge. (see instructions)
If the discharge is through an outfall that extends 206b
beyond the shoreline or is below the mean low
water line. complete item 7,
For Acencv Use
a,pr I Minor I qua
717
2�sc
For Acencv Use 1
303e
7. OKshore Discharge 145 feet from east bank.
a. Discharge Distance from Shore 207a feet
b. Dis`=harge Depth BefowWater 207b Invert elevatW.n is - 22.0 fee}
SVrface
If discha -e is !ram a bypass or an overRow point or is a seasonal discharge from a !agoon, holding pond, etc., complete Items 8,
9, or 10. as arp:-caNe and conZ,nue W-m Item 11.
e. Bypass Discharge (see insuuctions) N/A
4
a Eypass Occurence
Check when bypass occurs
Wet weaker 2ceat C) Yes F] No
Dry weather 20W ❑ Yes ❑ No
b. 9ypass Frequency Give the
ac --ai or approximate number
of -/pass incidents per year.
Wet weather 20;eb1 times per year
Dry weather 27R.,2 times per year
c. Bypass Duration Give the aver-
age bypass duration in hours.
Wet weather 208c1 hours
Dry weather 208c2 hours
d Bypass Volume Give the
average volume per bypass
incicent in thousand gallons
Wet weather 209dt thousand gallons per incident
Dry weather 2OEc2 thousand gallons per incident
e. 91-pass Reasons Give reasons 205a
w'Y Bypass occurs
Proceed to Item 11.
9. Ove�1low Discharge (see instruction N/A
a Overflow Occurrence Check
• when overflow occurs
Wet weather 209a1 Yes No
Dry weather 209a2 Yes (] No
b C•. e-!!c ti Frequency Give ftw
ac-L-at or approximate
incidents per year
V et weather 20%_ 1 times per year
Dry weather 20c-b-1 times per year

x
.FQH c u r ua�
DISCHARGE SERIAL NUMBER
0(
c. Over -ow Duration Give the
average overflow duration in
hours. -
Wet weather
209c1
Dry weather
209c2
d Qve;flow Volume Give the
average volume per overflow
incident in thousand gallons.
Wet weather
239d1
Dry weather
209r2
Proceed to Item 11
10. Seasona6'Reriodic Discharges
a. Saasorlaii^rericdc Dischar;-e
Fr:-,.:er^.cy It discharge is inter-
210a
mien r-orn a halting pond,
la J: . e=. g,4+e :we actual or
ac..: x::r,ate number of times
to;s-:s-_harp_occurs par year.
Dsscha:,e
21Co
Wl...r e Gwe the avenge
vc:u-ne =?" d:sz1ha,e
ir. tt'.o:tsa,d
cc'6"or�s
c Se-s=,a �e.:adic Dtscha--a
210c
Sue re average z_ra
�.:sv .aria
Ss_zsa_?. —_nca�c Discham,e
Cc_:ren;_•` tans Check the
210d
r;.zi-:—s = n-g : e year �ien
the-:scna-;e normaliy occur
a Ira::meat
D:s:.:7rt;:)n
Geszn;---- :.z:_ aba:ernent prat
tikes used on omis discharge
W;,n a bire' .na-rau. s. (Se8
. insc ors)
• Y
21la
t
hours
hours
thousand gallons per incident
thousand gallons per incident
N/A
times per year
thousand gallons per dischare occurrence
days
❑ JAN
❑ FES
p MAR
❑ APR
p N11AY
p JUN
p JUL
❑ AUG
p SEP
❑ OCT
❑ NCV
❑ DEc

r .�
DISCHARGE SERIAL 14UMRFR
. b. Discharge Treatment Codes
211b
Using the codes listed in Table I
of the Instruction Booklet,
describe the waste abatement
processes applied to this dis-
charge in the order in which
they occur, if possible.
Separate all codes with
commas except where slashes
are used to designate parallel
operations.
If this discharge is from a municipal waste
' treatment plant (not an overflow or bypass),
complete Items 12 and 13
1z Plant Design and Operation Manuals
Check which of the following are
currently available
a. Engineering Design Report
212a
b. Operation and Maintenance
212b
Manual
13. Plant Design Data (see instructions)
a Plant Design Flow (mgd)
213a
b. Plant Design BOO Removal(%
213b
c. Plant Design N Removal (%)
213c
- d Plant Design P Removal (°v)
213d,
e. Plant Design SS Removal (S.)
2.13e
f. Pan., Sea=an Opera�cn (year)
2t3f
g. Plant Ins: Major Revision (yea.
213g
11
4.0 mgd
98 ai,
93
50
90
Pr-O sed 1997
A
1

DISCHARGE SERIAL. NUMBER
001
14. Description of Influent and Effluent (see Instructions) (Continued)
Proposed
Proposed
nnuent
Emuent
Ann
Annuai
Lowest
Hignest
Frequency
Numberol
5ampte iype
Parameter and Code
Ave 2ge
Average
Monthly
Montiily
of Analysts
Analyses
Value
Value
Average
Average
214
Value
Value
{1)(2)
(3)
1 (4)
S)•
(6)
(7)
i otal Soics
mc1
035M -
to•ai , issoive�: 6oiics
mg/1
X300
IGu Jxispenc—ec wncs
mg,"
COEW
200
30
2/mo.
C
ea:.+e aster triesiaJe)
mill
`.
00545
Ar-monia (as )
mgil
-
006.0
(?.►ovide if availabie)
2
2/mo,
C
Ne::.ani Z:5ten
mg/l
ooE20
30
(Provide if available)
:gate (as )
nir,A
006:10
(Provide if available)
ante (as )
.
- rngll
-
00615
(Provide it available)
i-nospnor,:s total (as I')
Y
mg/1
,
00665
1/WO.
C
(P-mv:de if ava:fable)
,
t,issaivea Oxygen (I.UO)
:•:;>��.��.�^...
r
wee rT�. �C;;
00300

r L
r, tsc U,t
DISCHARGE SERIAL NUMBER
001
14. Description of Influent and Effluent (see Instructions)
Proposed Proposed
muent
;tnnfiuent
nuai Lowest
ignest
riquency
umoer of
p►e
Parameter and Code
Average
Average Monthly
Monthly
of Analysis
Analyses
Type
214
Value
Value Average
Average
Value
Value
(1)
(2) (3)
4)
(S)
(6)
(7)
How
Million gallons per day
50050
4.0
4.0
Cont.
Meter
pm
s
Units
Y•
i elmperature (winter)
OF
74^29
1/wk.
G
:F
74^27
80
1/Wk.
G
reCal S:re�nococc. macte .a
'
NLrrber.'100 ml
�
>�`•'"
74064
(F ovid? if availa`:I?)
reZa:..0.1:0,:11 =ac:ei.a
:. ,�
;•y
�,.' `,.: ,�!»: :•>
•�Y • • a:...7�1.A•
NL.:1_ r. 1
74C55
(P mv-c-a if available)
.' .�.
S� g
2/m0.
G
y
o,al coxcr-m eactera
tiumb...100 ml
�xMw •�W�.•�'',.
��-fr, x,��":'�x .;. ;�, '
��K•"v
Oi: J
..il.
(Pmv;de i, available)
mc,,1
CC310
250
5
2/mo.
C
t,.nemsza; (C6b) Uemana
(CO
.�
m,•1
CC3 :.0
(Provide if available)
OR
Tota! Organic Carbon (TOC)
rr;,1
WSW
(Provije a if available)
(Eithd anati sis is acceptable)
n:orne- Total Resicual
mg"1
SX60
5/wk .
G

• rQ H lo,.
DISCHARGE SERIAL NUMBER
001
15. Additional Wastewater Characteristics
Checks the box next to each parameter if it is present in the effluent (see instructions)
N/A - Discharge has not started.
rarametar
~resent
am,ne,--r
rrasent-----Parameter
Present
(21 5)
(215)
(215)
csromica
C40ait
I naj;,um
71870
01037
01069
nionce
Cnromiurn
titanium
OC -40
01034
01152
anise
Gopper
Tin
00-12-0
01042
01102
Iron
nc
0051
01045
01092
bursoe
LBW
Agccrces
00745
01061
74051
:_m+num
Mar._anese
',n'onnalec or7mic compouncs
01105
01055
74062
-t.nony
Mercury
Ulf anc grease
0:Cc-7
71900
00550
.,.;e:::c
res:JaCes
c,oc2
dim
7 C63
e .;,
N,c.cet
rrenas
0:012
0105-7
32730
carlL.-M
be enium
aura=n:s
01OC. 7
011.7
38260
comn
5uver
-Hacioacovity'
C 1 =2
01077
74050
�,azrna Im
0i
'r:ov:de spec:`: w^trcund aneor element in Items 17, if known.
Pesticides (Insec.cides, fungicides. and rodenticides)must be reported in terms of the acoeptable common names specified in
A,xep:a.`t? : or.inon Na.:.ss and Chemicditmas fcrthe ingrsd-en: Sz arnert v7 Pes;'A c:de L:?is. 2 nd Edition, Environmental
Prrlenan Agency. '::asininy on, D.C. 20250, June 1972, as required by Subseclon 162.7 (b) of the Regulations for the
Ento .enxnt of V e Federai Insecticide, Fungicide, and Rodenticide Act.
11

1�1: haliy
16. Plant Controls Check if the following
plant controls are available for this
discharge
Alternate power source for major
pumping facility includng those
for collection system lift stations
Alarm for power or equipment
failure
V. Adlitiona! Information
` 7.
DISCHARGE SERIAL NUMBER
001
216
❑ APS
ALM

.-IGt�lI.cyA yam
STANDARD FORM A - MUNICIPAL
SECTION 111. SCHEDULED IMPROVEMENTS AND SCHEDULES OF IMPLEMENTATION
This section rewires information on any unoompleted implementation schedule which has been imposed for construction of waste
treatment facilities. Requirement schedules may have been established by local, State, or Federal agencies or by court action. IF
YOU ARE SUBJECT TO SEVERAL DIFFERENT IMPLEMENTATION SCHEDULES EITHER BECAUSE OF DIFFERENT
LEVELS OF AUTHORITY IMPOSING DIFFERENT SCHEDULES (ITEM 1b AND/OBI STAGED CONSTRUCTION OF
SEPARATE OPERATIONAL UNITS (ITEM 19), SUBMIT A SEPARATE SECTION III FOR EACH ONE..
t-UH AGENCY USE
::
1. Improvements Required
a Discharge Serial Numbers 300
Affected List the discharge
serial numbers, assigned in
Section II, that are covered by
this implementation schedule
b. - Authority Imposing Require- 301a N/A
ment Check the appropriate
Item indicating the authority
for the implementation schedule
If the identical implementation
schedule has been ordered by
more than one authority, check
the appropriate items. (see
instructions)
Locally developed plan 301b [] LOC
Areawide Plan ARE
Basin Plan Q BAS
State approved implementation ❑ SQS
schedule
Federal approved water quality M WQS
standards implementation plan
Federal enforcement procedure M ENF
or action
State court order CRT
Federal*oourt order FED
C. Improvement Descriplion Specify the 3-character code for the General Action
Description In Table 11 that best describes the improvements required by the
implementation schedule. If more than one schedule applies to the facility because
of a staged construction schedule, state the stage of construction being described
here with the appropriate general action code. Submit a separate Section III for each
stage of construction planned. Also, list all the 3-character (Specific Action) codes which
describe in more detail the pollution abatement practices that the Implementation sdwciuule requires.
E-j
3-character general action 301c rJMI
description
3-character specific action 301d _� /��l N/A
Implementation Schedule and 3. Actual Complete Dates
Provide dates imposed by schedule'and any actual dates of completion for implementation steps listed below.
Indicate dates as accurately as possible. (see instructions)
Implementation Steps 2. Schedule (yr/Mo/Day) 3. Actual Completion (Yr/Mo/Day)
a Preliminary plan complete 302a 5 05/ 08 303a
b. Final plan complete 302b 96 00,5/ 01 303b
c. Financing complete & contract 302c o/ �/� 303c
awarded
d
Site acquired
e.
Begin construction
f.
End construction
g.
Begin discharge
h.
Operational level attained
302d
96/03/ 01
3Wd
302e
96/12/ 01
3030
05/15
303f
W2g
� 0
�3mg
302h
_981071�
30c3h
—J—I
_J_l

FOR AGENC US"
STANDARD FORM A MUNICIPAL
SECTION IV. INDUSTRIAL WASTE CONTRIBUTION TO MUNICIPAL SYSTEM
Submit a description of each major industrial facility discharging to the municipal system, using a separate Section IV for each
facility description. Indicate the 4 digit Standard Industrial Classification(SIC) Code for the industry, the major product or raw
material, the low (in thousand gallons ger day), and the characteristics of the wastewater discharged from the industrial facility
into the municipal system. Consult Table III for standard measures of products or raw materials. (see Instructions)
1. Major Contributing Facility
(see instructions)
Name 401a N/A None are expected to be present.
Number& Street 401b
City 401c
County 401d
State 4019
Zip Code 401f
2. Primary Standard Industrial 402
Classification Code(sae Instructions)
3. Primary Product or Raw Material Unks(See
(see instructions) QLaft Table 111)
Product 403a 403c 403e
Raw Material 403b 403d 403f
4. Flow Indicate the volume of water
discharged into the municipal sys-
tem in thousand gallons per day 404a _thousand gallons per day
and whether this discharge is
intermittent or continuous. 404b Intermittent(int) Continuous (con)
5. Pretreatment Provided Indicate if 405 Yes No
pretreatment is provided prior to
entering the municipal system
6. Characteristics of Wastewater
(see instructions)
a

'R000
pet
LM
AIRPORT
yw i
l` ING RO
M� �O
u O0&
[R
Z/
s 1)\
R sr
s� oaRa c..r}o-1 r_—
s'sreM
NORTH SIDE WASTEWATER
P{
TREATMENT FACILITY -
DISCHARGE SITE
NCDES No. NCO081736
;
Map -Not -To -Scale
l-
December 27, 1995
\

4
VI. PREFERRED PROCESS
As previously described in Section III (Overview), the proposed New Hanover County
Wastewater Treatment Facility will consist of the construction of 4.0 mgd hydraulic
capacity, capable of meeting tertiary limitations (5 ppm BOD, and 2 ppm NH,-N). It is
anticipated the facility will be located in close proximity to the City of Wilmington's
Northside Wastewater Treatment Facility, such that discharge pumping and ultimate
disposal will be accommodated through the City of Wilmington's existing outfall. It is
anticipated this shared or common outfall will come in the form of a written agreement
between the City of Wilmington and New Hanover County. At the time of this report,
this agreement has been accepted verbally as long as the impacts to the City of
Wilmington's Northside Wastewater Treatment Facility are minimal.
Process Description. The recommended process for the proposed New Hanover
County WWTP is extended aeration, with oxidation ditch reactor basins followed by
secondary clarification, tertiary filtration and UV disinfection. The extended aeration
process will provide the ability to meet the effluent limitations NH,-N Residuals
(sludge) handling will be accomplished with a drying/bulking plant to produce a Class
A sludge. Septage and grease will be side -streamed, pretreated and the dewatered
products will be blended with the dried sludge or separated for land application.
a. Influent Headwolks Area: The influent line will be routed
through a junction box and into a dual channel influent bar screening process. One
channel will be equipped with a mechanical bar screen. It is anticipated that the
mechanical screen, with openings no greater than 1/2-inch, will be a, grate type
mechanism and will travel on a guide rail assembly or be an in -channel rotary type of
screen. The alternate, or bypass channel will be equipped with a manual bar screen,
probably aluminum or stainless steel, with openings no greater than 1/2-inch. In the
• event the mechanical bar screen needs to be taken out of service, the influent flow can
be diverted to the bypass manual bar screen channel through the operation of slide
gates.
Immediately following influent screening, the flow will be directed through a Parshall
flume equipped with an ultrasonic flow meter. The flow meter will provide the
necessary influent flow measurement and provide an output signal to the main computer
■ control system. Two slide gates will follow the Parshall flume and will be used to
direct the flow to the aerated grit/scum removal unit.
b. Aerated Grit and Scum Removal Unit: The screened wastewater
will gravity flow to the Aerated Grit and Scum Removal Unit which will be located
immediately prior to the Influent Splitter Box. The unit will be of a design that will
induce a lateral gut roll of the wastewater allowing the heavier grit particles to drop to
Li the bottom of the grit chamber. The grit particles will. then be suctioned out by a
traveling pump and transferred to a grit hopper for disposal. Adjacent to the aerated
Page 10
New Hanover Cottrtry Concept Design Report

grit chamber will be a scum removal chamber where scum and light debris will be
floated to the top for removal by a skimming device.
C. Influent Wastewater Pumping Station: The Influent Pump
Station will be sized to obtain the necessary pumping capacity for an average daily flow
of 4 m d . It is anticipated there will be four i
g p nfluent pumps, possibly submersible, in
the 70 to 100 hp range. Three of the pumps will be in service at all times, one will be
in reserve to be used- as a backup for reserve capacity. Volume variations will be
accommodated through pump sequencing and/or variable speed control. The pumps
will be rotated in service to ensure equal wear on parts. A hoist and trolley system will
afford the Operator the ability to easily remove the influent wastewater pumps and
trolley them out of the station through a double door entrance way if needed.
d. O.idation Ditches: Oxidation ditches will serve as the primary
reactor basins for the extended aeration process. Each basin will be approximately 20
feet deep, 120 feet long, with a 40 foot channel width. The dual -basin design will
incorporate common wall construction and each basin will be equipped ed with aeration
q
equipment necessary to promote the carboilaceous and nitrogenous removal of waste.
It is anticipated that each reactor basin will be operated to accommodate fluctuations in
influent flow throuall the operation of weirs
. s. The total capacity of both reactor basins
will be between 4.0 and 5.0 million gallons and will be operated at a mixed liquid
suspended solids concentration between 3.000 and 4,500 mg/L. A residual operating
+ dissolved oxygen (DO) level will be maintained within each reactor basin.
e. Final Circular Claiifiels: Following the reactor basins, the flow
will be diverted to a splitter box where the flow will be equally divided to each of two
circular secondary, or final clarifiers. The clarifiers will be cylindrical tanks, 85 feet
to 90 feet in diameter and approximately 15 feet deep, with slightly sloping bottoms
where the settling of suspended solids is allowed to take place. Each clarifier will be
equipped with radial rakes that rotate continuously, removing settled solids from the
bottom of the tank by means of rapid withdrawal suction piping as well as a center
sludge pocket, from which the sludge is withdrawn to the Sludge Return Pump Station
and eventually returned to the reactor basins. A full surface skimming device will be
provided to remove floating scum, oil, or floating solids periodically from the surface.
The clarified effluent liquid will flow radially outward to a weir where it will overflow
to a launder to exit the unit and continue downstream to a distribution box (or wet well)
before being routed to tertiary filtration and U`t Disinfection.
f. Transfer Station : A Transfer Pump Station will provide
for the transfer of main process flow from the site of this new facility to the City of
Wilmington's Northside WWTP facilities in preparation for discharge.
Page 11
New Hanover County Concept Design Report

g. Sludge Return Pump Station: The sludge withdrawn from the
final clarifiers will be conveyed to the wet well of the Sludge Return Pump Station.
The pump station will house 3 to 4 solids handling pumps in the 60 to 80 hp range
whose intended purpose is to return the sludge to the reactor basins in order to maintain
a return activated sludge loop within the treatment process. In addition to the ability to
return sludge, a system of piping will be designed that will serve to periodically waste
the sludge directly to the residuals handling process train when the mixed liquid
suspended solids concentration builds to undesirable levels in the reactor basins.
h. Deep Bed Tertiary Filtration: The clarified effluent .from the
circular clarifiers will leave the distribution box and be transferred to a four zone, deep
bed, dual media filter basin. In this filter, the clarified effluent will be distributed onto
a two stage granular filter media. As the liquid is filtered down through the media,
residual solids will be trapped in the granular substrate. The system will. be designed to
operate on a rotation basis to allow air and water backwash of one of the four zones
while the other three zones are used for the filtration process. This will afford the
Operator the opportunity to air scour and water wash the filter media in all the four
zones periodically to maintain an efficient filtration process. The filtered liquid will be
collected through an underdrain system and accumulate in the filtered water overflow
chamber. The backwash liquid will be drawn from this chamber. After the backwash
is completed the liquid filter waste will be siphoned off and equalized in a mudwell
until it can be reintroduced into the treatment process.
i. Ultraviolet Disinfection: Following filtration, the clarified
wastewater will be directed through a channel containing banks of horizontal or vertical
ultraviolet bulbs. The ultraviolet light provides for fecal kill and disinfection of the
clarified effluent without the addition of toxic chemicals or gases. The Ultraviolet
Disinfection unit will be designed with 100% standby capacity to satisfy the reliability
clause of the State regulations. Flow level within the UV disinfection unit will be
maintained by a pivotal counter balance weir mechanism at the exit end of the UV
chamber.
j. Post Ae1-ation System: The disinfected effluent will leave the UV
disinfection unit and will be re -aerated by flowing over a cascade aerator or other post
aeration device. The flow will then pass to the wet well of the effluent pump station.
It will then be pumped to the outfall point on the Cape Fear River.
k Equaliuition: Equalization will be accomplished within the
oxidation ditch reactor basins themselves by controlling the setting of the basin
overflow weirs, thus controlling the basin volume.
1. Septage & G,-ease: Septage and grease will be side -streamed into
a pretreatment process to avoid shocking the main waste stream. Septage and grease
haulers will unload into a rotary screening/aerated grit removal package unit. The unit
Page 12
New Hanover County Concept Design Report

will remove rags, plastics and other debris, wash, de -water and convey them to a waste
receptacle, and remove grit and gravel. In the process, the waste stream will become
homogenized and be fed to a small Dissolved Air Flotation unit. Utilizing polymer
enhancement, this unit will separate and de -water 90% of the grease and oil for bulk
disposal, blending with dried sludge or blending and disposal with screened out debris.
80% to 90% of the settled solids will be removed and routed to the digester; the
unloaded effluent will be routed to the plant headworks. Odor control will be
accomplished by sharing collection and scrubbing equipment with the sludge handling
and drying facilities.
M. Residuals Handling Process Train: The waste activated sludge
will be pumped from the Sludge Return Pump Station to 'a staging Digester. The
digester, which will be equipped with blowers and a coarse bubble diffused aeration
system, will equalize, digest, and store the sludge prior to the thickening unit. The
thickener will take the sludge from 1.25 percent solids concentration to 6 - 12 percent
solids prior to the Air Dryer System, which will remove the water content to provide
for 90 percent solids. This will produce a Class A product. The solids will be stored
in silos adjacent to the drying facility. The dry solids will be periodically removed
from the site and disposed of in compliance of 503 regulations.
n. Lahoratory and Control Facilities: The laboratory and control
building will be designed to provide laboratory space, a Superintendent's office, a
lab/computer control assistant office, breakroorn and required restroom, shower and
ancillary space. All process data will be correlated on a central computer unit from the
remote sensors located at all the major process stages throughout the plant. This will
allow direct monitoring capabilities of process data, flow meter, and sampling device
outputs from each of the sensor locations. Remote Terminal Units located strategically
throughout the plant will allow operators to access and evaluate individual treatment
phase performance, as well as overall plant performance, and make necessary
adjustments. This control and instrumentation system will be housed at the laboratory
and control facilities.
o. Standby Power Facility: The proposed New Hanover County
Wastewater Treatment Facility will be operated with 100% standby capacity. The
requirement for standby power comes through the classification of the receiving stream.
Standby power will be accommodated through the addition of an independent generator
with either manual or automatic switch over capabilities. A final sizing and
implementation of the standby power will come during the design phase of the project.
Page 13
New Hanover Coway Concept Design Report

anon am IN MA'M7 W"-Afo-".
ISplitter
Box
New Hanover Countq Wastewater Treatment Facilhj
.F _�; Process 5cheniatic
Flash Mix Reactor
Oxidation Ditch Basin
Cla ri f iers
Return Activated Sludge
ISludge Return
Pump Station
Tertiary Filter
Transfer Pump
Station Sludge Digestion/
Stabilization Facilities
uv
Disinfection System
Post Aeration
Discharge Pump
Station
e
HOBBS, UPCHURCH & ASSOCIATES, P.A.
No CONSULTING ENGINEERS
SOUTHERN PINES, NORTH CAROLINA 28387

Jqb Namip: New Hanover County Wastewater Treatment Facility
HUA No. NH9401
J Date: 8-May-95
Description: Aeration Basin Sizing and Parameter Calculation Worksheet
Formulas:
Sludge Age (days) = Suspended Solids In Aeration
Suspended Solids To Aeration
MLSS (mg/1) = Desired Suspended Solids In Aeration
Weight Of Water In Aeration
MCRT (days) _ suspended Solids In Aeration
SS In WAS + SS In Effluent
Food To Microorganism Ratio = BOD To Aeration
MLVSS in Aeration
arrative: The Reactor basin shall be an extended aeration oxidation ditch. Aeration shall
be supplied by submerged jet headers.
Input Parameters:
Wastewater Flow & Influent Conditions:
Peak Wet Weather Flow (mgd) =
10.000
Design Year Flow, ADF (mgd) =
4.000
Start -Up Anticipated Flow (mgd) =
2.000
Design Sludge Return Rate (mgd) =
4.000
Influent BOD5 (mg/1) =
250
Influent TSS (mg/1) =
200
Influent TKN (mg/1) =
40
Effluent BOD5 Required (mg/1) =
5
i Effluent TSS Required (mg/I) =
5
I Effluent NH3-N (mg/1) =
2
Max Temperature (deg C) =
27
Site Elevation =
20
i' Temperature Correction Theta =
1.024
I Saturation D.O. at Temp, Elev Cst (mg/1) =
7.87
Calculated Parameters:
Calculated Parameters:
ADF BOD5 Destroyed (lb/day) = > 8,340
ADF Ammonia -Nitrogen Destroyed (lb/day) = > 1,334
Yr.1 BOD5 Destroyed (lb/day) = > 4,170
Yr.1 Ammonia -Nitrogen Destroyed (lb/day) _ > 667
Oxygen Rates
ADF Actual Oxygen Transfer Rate, AOTR (lb/day) =
16,980
ADF Standard Oxygen Transfer Rate, SOTR (lb/day)
34,112
Yr.1 Actual Oxygen Transfer Rate, AOTR (lb/day) =
8,490
Yr.1 Standard Oxygen Transfer Rate, SOTR (lb/day)
17,056
HP Required
HP At Average Daily Flow = >
HP At Year 1 Flow = >
)esign Assumptions
Reactor Basin Volume (Based on IbBOD/1000 cult)
Design MLSS (mg/1) = 3,800
Volume Required (gals) = >
Yr.1 MLSS (mg/0 = 3,800
Detention Time (hrs) = >
RAS and WAS Concentration (mg/1) = 8,000
Transfer Alpha Value = 0.70
System Mass Requirements
Transfer Beta Value = 0.95
System Mass - BOD x MCRT x Yield (lb) = >
Mean Cell Residence Time (days) = 17
Volume Required (gal) = >
Operating Dissolved Oxygen, Co (mg/1) = 2.00
Detention Time (hrs) = >
lb BOD5/1000 cu ft Aeration Vol = 15
Sludge Yield (lb TSS/lb BOD5 Destroyed) = 0.75
Selected Volume - Input Value (gals)
Volatile SS Fraction (MLVSS/MLSS) = 0.65
Selected Basin Evaluation
late Coefficients
ADF Detention Time (hrs) = >
lb Oxygen/lb BOD5 Applied = 1.30
Yr. 1 Detention Time Both Trains (hrs) = >
lb Oxygen/lb NH3-N Applied = 4.60
Yr. 1 Detention Time 1 Train (hrs) = >
ADF Food To Mass (Ib BOD/lb MLSS) _ >
iP Coefficients
Yr. 1 Food To Mass (Ib SOD/lb MLSS) = >
lb 02/13HP-Hr = 3.40
Yr. 1 Food To Mass-1 Train (lb BOD/lb MLSS) _
ADF Sludge Wasting Rate (gpd) _ >
Yr. 1 Sludge Wasting Rate (gpd) _ >
418
209
4,158,880
24.95
106,335
3,355,263
20.13
4,010, 845
24.07
48.13
24.07
010
0.05
0.10
109,265
54,632
Hobbs, Upchurch and Associates c:lwga%projects%nh94011DESIGNER.XLS
Consulting Engineers 5/5/956:06 PM

"fob Nam. e: New rianover t.uunty vvabLewau:r I reaLment racinty
HUA No. NH9401
t ..
Date: 8-May-95
Description: Clarifier Sizing - Final Clarifiers - Following Extended Aeration
f Formulas:
(Surface Loading Hate (uru/5r-) = t-iow rate tuvu)
Surface Area (SF)
v�
(Hydraulic Detention Time Mrs) = Tank Volume (GALS) x 24 Hr/Day
Flow (GPD)
Solids Loading Rate .(Lbs/Day/SF) = Solids Applied (Lb/Day)
Surface Area (SF)
(Weir Overflow Rate (GPD/FT of Weir) = Flow Rate (GPD)
Weir Length (FT)
Narrative: Clarification is for secondary settling following an extended aeration, activated sludge
reactor basin. Polymer addition is anticipated in early years to assist in settling characteristics
Input Parameters:
Calculated Parameters:
Wastewater Flow:
Calculated Diameter:
Peak Wet Weather Flow (mgd) = 10.000
Surface Loading Basis (FT) = > 85.30
Design Year Flow, ADF (mgd) = 4.000
Solids Loading Basis (FT) = > 84.89
Start -Up Anticipated Flow (mgd) = 2.000
Weir Overflow Basis (FT) = > 132.63
Design Sludge Return Rate (mgd) = 4.000
Detention Time Basis (FT) = > 63.66
'!Mixed Liquor Suspended Solids Concentration:
Minimum Diameter Required (FT) _ > 132.63
ADF MLSS (mg/1) = 3,800
Selected Diameter (FT) = > 85.00
Yr.1 MLSS (mg/1) = 3,800
Calculated Conditions:
clarifier Parameters:
Surface Loading Rate:
Number Of Units = 2
Peak Wet Weather (GPD/SF) = > 881
Sidewater Depth (ft) = 14
Design Year, ADF (GPD/SF) = > 352
Design Surface Loading Rate (GPD/SF) = 350
Yr 1 One Unit Out Of Service (GPD/SF) = > 352
Design Solids Loading Rate (Lb/Day/SF) = 28
ADF One Unit Out Of Service (GPD/SF) = > 705
Design Weir Overflow Rate (GPD/LF) = 12,000
Design Detention Time (Hrs) = 4
Solids Loading Rate:
Peak Flow, ADF MLSS (Lb/Day/SF) _ > 28
ADF+RAS, ADF MLSS (Lb/Day/SF) _ > 22
ADF+RAS, Yr.1 MLSS (Lb/Day,39 _ > 22
Yr 1, One Unit Out, ADF MLSS (Lb/Day/SF) 22
Yr 1, One Unit Out, Yr.1 MLSS (Lb/Day/SF) 22
Weir Overflow Rate:
Peak Wet Weather (GPD/LF) = > 18,724
Design Year, ADF (GPD/LF) = > 7,490
Yr 1 One Unit Out Of Service (GPD/LF) = > 7,490
ADF One Unit Out Of Service (GPD/LF) = > 14,979
I
Detention Time:
Peak Wet Weather Mrs) = > 2.85
Design Year, ADF Mrs) = > 7.13
Yr 1 One Unit Out Of Service Mrs) = > 7.13
ADF One Unit Out Of Service Mrs) = > Z.57
Hobbs, Upchurch and Associates c:lwgelprojectslnh94011DESIGNERALS
Consulting Engineers 515/956:16 PM

,fob Name: New Hanover L:ounty wastewater I reatment Facility
HUA No. NH9401
(Date: 8-May-95
Description: Disinfection, Cascade Post Aeration, and Sludge Digestor Calculations
Formulas:
Cascade Aerator Deficit Ratio, r =
j , P. Total Cascade Vertical Drop Rqd =
Pounds Of Solids Wasted Per Day =
Cs - Co
Cs -C
r- 1
(0.1 1)(a)M0 +0.046)(T)
(Q Was)(8.34)(MLSS Was)
r
IVolume Of Thickened Sludge (gpd) = Pounds Of Solids Wasted Per Day
(Thickened Conc - Decant Conc)(8.34)
(Narrative: Redundant UV Disinfection To Be Employed. Cascade Post Aeration
To Re -Aerate The Wastewater. Sludge Handling Through Drying, Land Application
Input Parameters:
Wastewater Flow:
Peak Wet Weather Flow (mgd) _
Design Year Flow, ADF (mgd) _
Start -Up Anticipated Flow (mgd) =
Chlorine Contact Basin Parameters
Required Detention Time (min) _
Number Of Chamber Trains =
Design Sidewater Depth in Chamber (ft) =
Design Width of Chamber (ft) =
Cascade Aerator Input Parameters
Dissolved Oxygen Saturation Cs (mg/1) _
D.O. Before Cascade Co (mg/1) =
Required Effluent D.O. C (mg/1) =
Coeff a 0.0 For BOD <=15mg/1) =
Coeff b (Assume 0.8 For a Step Weir) =
Wastewater Temperature (deg C) _
Sludge Digestion & Storage Input Parameters
ADF Sludge Wasting Rate (gpd) _
Yr. 1 Sludge Wasting Rate (gpd) =
Target Percent Solids After Thickening =
Target Decant Solids Concentration (mgll) _
i
I
Calculated Parameters:
10.000
4.000
2.000
30
2
8
3
Cascade Aerator Calculated Parameters
Height Of Vertical Drop Required (ft) = > 11
9.1392
0
Sludge Digestion & Storage Calculated Parameters
6
1.00
ADF Pounds Of Soilids Per Day = > 7,290
0.80
Yr.1 Pounds Of Soilids Per Day = > 3,645
20
ADF Thickened Sludge Volume (gpd) = > 14,593
Yr.1 Thickened Sludge Volume (gpd) = > 7,296
109,265
54,632
6.00%
100
Hobbs, Upchurch and Associates
Consulting Engineers
c:lwgelproiec ts%nh940110ESIGNERALS
6/51956:14 PM

Concept Design Report
7
New Hanover County Wastewater Treatment Facility
HUA No.NH9401
8-May-95
Clarifier Concrete Calculations Hobbs, Upchurch & Assoc. Layout
Item Symbol Quantity Unit
Number Of Clarifiers
N
2
Clarifier Diameter
DIA
85.00 ft
Wall Height
WH
15.50 ft
;Clarifier Wall Thicknes
OT
12.00 in
.Slab Thickness
FT
12.00 in
Slab Overhang
SO
18.00 in
Launder Width
LW
2.00 ft
Launder Perimeter Hei
LH
6.00 ft
Launder Thickness
LT
8.00 in
',Sidewater Depth
SWD
14.00 ft
Concrete In Floor Slab
_{(((((DIA + ((2*OT)/12 + (2 *SO)/12))"2) *PI) *0.25) *(FT/12))/27) *N
471.2 CY
,Concrete In Curved Wall
((((((DIA + ((2 *0T)/12))A2-(DIA)"2) *PI) *0.25) *WH)/27) *N
310.2 CY
Concrete In Launder Slab
= ((((((DIA + ((2 *0T)/12) + (2 *LW))" 2-(DIA+ ((2 *0T)/12))"2) *PI) *0.25) *(LT/12))/27) *N
27.6 CY
`
Concrete In Launder Walls
_ ((((((DIA + ((2*0T)/12) + (2 *LW) + ((2 *LT)/12))"2-(DIA + ((2*OT)/12) +
85.3 CY (2 * LW) )A2) *PI) *0.25) *LH)/27) *N
Total Slab Concrete
498.9
x $ 285/CY $142,173
Total Curved Wall Con
395.5
x $475/CY $187,877
Total Concrete
894.4
CY $330,050
Hobbs, Upchurch and Associates
Consulting Engineers c:%W9elpr0iectM94011CLARCON.XLS5/7195

Concept Design Report
New Hanover County Wastewater Treatment Facility
HUA No.NH9401
NJ8-May-95
Oxidation Ditch Concrete Calculations
Item
Number Of Ditches
Wall Height
Channel Width
Straight Wall Length
Outer Wall Thickness
Center Wall Thickness
Floor Thickness
Footing Over Hang
Baffle Straight Length
Baffle Thickness
Sidewater Depth
Concrete In Straight Wall Slab
Concrete In Curved Wall Slab
4
Concrete In Straight Walls
Concrete In Curved Walls
Concrete In Straight Baffle Wall
11 Concrete In Curved Baffle Wall
Total Slab Concrete
Total Straight Wall Concrete
Total Curved Wall Concrete
Total Concrete
Hobbs, Upchurch and Associates
Consulting Engineers
Hobbs, Upchurch & Assoc. Layout
Symbol
Quantity
Unit
N
2
WH
2O.33
ft
CW
40.00
ft
STW
120.00
ft
OT
18.00
in
CT
8.00
in
FT
18.00
in
FO
18.00
in
BL
8.00
ft
BW
8.00
in
SWD
18.33
ft
Volume Check (Total)
Vol = > 4,010,845 GALS
= (((((WH *2) + ((OT+ (2 *STW) + (2 *FT))/l 2)) *CW) *(CT/12))/27) *N
1155.6 CY
_ ((((((WH *2) + ((OT + (2*STW) + (2 *FT))/12))A2) *PI)/4)/27) *N
437.0 CY
=((((STW/12)*((2*(OT)) +CT))*WH)/27)*N
662.6 CY
_ ((((((CW *2) + ((CT+ (2 *OT))/12))A2)-(((CW*2) + (CT/12))"2)) *PI *0.25 *WH)/27) *N
583.1 CY
_ (((BL*(BW/12) *WH)/27) *2) *N
16.1 CY
_ ((((((CW *2) + ((CT+ (2 *OT))/12))A2)-(((CW *2) + (CT/12))"2)) *PI *0.25 *WH) /27) *N
128.3 CY
1592.5
x $285/CY
$453,872
678.7
x $450/CY
$305,402
711.4
x $475/CY
$337,896
2,982.6 CY $1,097,170
c:lwgelprojects%nh94011O XCO N. XLSS/7/95
I
i

Pump Station
42.1
376.80
376.80
..vvv
$0.0500
YV.VJVV
$0.0500
7LL.JLS
$37.68
Aeration
121
1086.56
1086.56
$0.0500
$0.0500
$108.66
Clarification/Flash
4
35.81
35.81
$0.0500
$0.0500
$3.58
Sludge Return
15.8
54.98
227.63
$0.0500
$0.0500
$14.13
UV Disinfect
30
268.56
268.56
$0.0500
$0.0500
$26.86
Sludge Holding
0.0
0.00
0.00
$0.0500
$0.0500
$0.00
Daily Energy Cost = >
$213.28
Daily Demand Peak = >
$28.97
Daily Basic Rate = >
$0.70
Subtotal
$242.95
3% Energy Sales Tax = >
$7.29
Total Daily Energy Cost = >
$243.65
Annual Energy Cost = >
$88,933.90
Equipment Maintenance Cost
Assume $0.02 Per Kwl 4265.66
X $0.02 = > $85.31
Total Maintenance Cost = >
$85.31
Annual Maintenance Cost = >
$31,139.32
Sludge Management = >
$75, 000.00
Labor Cost:
Description
(per yr)
Super, Lab Tech & Operators
$160,234
Annual Labor Cost = >
$160, 234.00
c:lexcel\NHO&M2.XLS Paget 5M95
f

Town Of Slier City Wastewater Treatment Facility
Plant Operation and Maintenance Budget Year No. 20
Chemical Cost:
Concentratio
Plant Flow
Total Chemical
Chemical Cost
Chemical
(ppm)
(mgd)
(Ibs)
(per lb)
Daily Cost
Polymer
0.5
4
16.68
$2.00
$33.36
Lime
1
4
33.36
$0.08
$2.67
Alum
20
4
667.28
$0.07
$46.71
Energy Cost:
Process Unit
Headworks
Pump Station
Aeration
Clarification/Flash
Sludge Return
UV Disinfect
hSludae Holdina
Peak Use
Off Peak Use
Wire HP
(Kw-Hr/Day
(Kw-Hr/Day)
25
223.80
223.80
84.2
753.60
753.60
243
2173.13
2173.13
4
35.81
35.81
31.6
109.95
455.27
30
268.56
268.56
0.0
0.00
0.00
Equipment Maintenance Cost
Assume $0.02 Per KwI 7474.98
Labor Cost:
L
c:lexcellNH0&M2. XLS
Total Daily Chemical Cost = >
Annual Chemical Cost = >
Peak Cost Off Peak Cost
(per Kw-Hr) (per Kw-Hr)
$0.0500 $0.0500
$0.0500 $0.0500
$0.0500 $0.0500
$0.0500 $0.0500
$0.0500 $0.0500
$0.0500 $0.0500
$0.0500 $0.0500
Daily Energy Cost = >
Daily Demand Peak = >
Daily Basic Rate = >
Subtotal
3% Energy Sales Tax = >
Total Daily Energy Cost = >
Annual Energy Cost = >
X $ 0.02 = > 1 $149.50
Total Maintenance Cost = >
Annual Maintenance Cost = >
Sludge Management = >
Description
Super, Lab Tech & Operators
Annual Labor Cost = >
$82.74
$30, 20 7. 09
Daily Cost
$ 22.38
$75.36
$217.31
$3.58
$28.26
$26.86
$0.00
$373.75
$ 50.77
$ 0.70
$425.22
$12.76
$425.92
$155, 460.06
$149.50
$54, 567.38
$140, 000.00
(per yr)
$289,400
$344, 898.61
Page 2 5n195

PERMIT NO.: NCO081736
PERMITTEE NAME: County of New Hanover
FACILITY NAME: Noah-Si&Vastewater Treatment Facility
Facility Status: Proposed
Permit Status: Renewal
Major `I Minor
Pipe No.: 001
Design Capacity:
4.0 MGD
Domestic (% of Flow): 100 %
Industrial (% of Flow):
Comments:
This is still a Dr000sed facility, construction may begin in 1997.
so_Tlory E.'3-�.S �J> l._L� rNc=m11. G-zc�
�Iz :ari Nc• cw-�pmdw Nm\�..0 bJ( dowc�i:
saci.DN 6.3.8 CP G-4o� ��� «�e.�Ywu� JP<cJM'Ja1L �,— F��F`I
RECEIVING STREAM: the Cape Fear River t
Class: SC
Sub -Basin: 03-06-17
Reference USGS Quad: K27NW (please attach)
County: New Hanover
Regional Office: Wilmington Regional Office
Previous Exp. Date: 6/30/96 Treatment Plant Class: not rated
Classification changes within three miles:
no change
Requested by: Mary Cabe Dare: 1/10/96
Prepared by: Date:
Reviewed by: I Date: (�
Modeler
Date Rec.
#
Jcp
IWIF,
8 Z
Drainage Area (mi2): not available Average Streamflow (cfs):
s7Q10 (cfs): Tidal w7010 (cfs): Tidal 3002 (cfs): Tidal
Toxicity Limits: Acute (Fathead Minnow) P / F 90 %
March, June, September, and December
Upstream Location: Highway 133 / 117 bridge
Downstream Location: Highway 17 / 74 bridge
Parameters: temperature, dissolved oxygen, feeet-eeli# ,,
Special instream monitoring locations or monitoring frequencies:
Wasteflow, (MGD):
BOD5 (mg/1):
NH3N (mg/1):
DO (mg/1):
TSS (mg/1):
Fecal Col. (/100 ml):
pH (SU):
Residual Chlorine (µg/1)
TP (mg/1):
TN (mg/1):
Lead (µg/1):
Monthly Average
Summer
Winter
4.0
4.0
5.0
10.0
2.0
4.0
6.0
6.0
30
30
200
200
6.8 - 8.5
6.8 - 8.5
13.0"
13.0'
monitor
monitor
monitor
monitor
monitor
monitor
There shall be no discharge of floating solids or visible foam in other
than trace amounts.
' Total residual chlorine limit will apply only in periods when chlorine is
used for disinfection.

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
f r� Request # 8427
New Hanover County - N
NC0081736 plAiside Wastewater Treatment Plant
Domestic - 100 %
Industrial - 0 %
Proposed
Renewal
Stream Characteristic:
Cape Fear River
USGS #
SC
Date:
03-06-17
Drainage Area (mi2):
New Hanover
Summer 7Q10 (cfs): TIDAL
Wilmington
Winter 7Q10 (cfs):
Cabe
Average Flow (cfs):
1 / 15 / 9 6
30Q2 (cfs):
K 27 NW
IWC(%):
Wasteload Allocation Summary
(approach taken, correspondence with region, EPA, etc.)
"New Hanover County has recently purchased the wastewater treatment facilities for several subdivisions
located on the north side of the county and plans to regionalize wastewater treatment. Regionalization will
be achieved in the short run through connection to one of Wilmington's regional wastewater treatment
plants. The long-term solution is construction of the 4.0 MGD new Hanover County WWTP to serve
northern New Hanover County. The proposed facility has been permitted to discharge to the Cape Fear
River below the confluence with the Northeast Cape Fear with requirements for advanced tertiary
treatment, i.e., summer (winter) limits of BOD5 = 5 (10) mg/I and NH3-N = 2 (4) mg/1."
Cape Fear River Basinwide Water Quality Management Plan, (section 6.3.8)
Facility has been recommended with instream monitoring requirements in accordance with other
dischargers in area.
No Significant Industrial Users (SIU's) currently slated for discharge to this proposed facility.
Special Schedule Requirements and additional comments from Reviewers:
Reviewed by
Instream Assessment:
Regional Supervisor-1
Permits & Engineering:
APR 19 1996
RETURN TO TECHNICAL SUPPORT BY:
6
— CA (o

CONVENTIONAL PARAMETERS
Existing Limits:
Monthly Average
Summer
Winter
Wasteflow (MGD):
4.0
4.0
BOD5 (mgtl):
5.0
10.0
NH3N (mg/1):
2.0
4.0
DO (mg/1):
6.0
6.0
TSS (mg/1):
30
30
Fecal Coliform V100 ml):
200
200
pH (Sin:
6.8- 8.5
6.8- 8.5
Residual Chlorine (µg/1):
28.0
28.0
Total Phosphorus (mg/1):
monitor
monitor
Total Nitrogen (mg/1):
monitor
monitor
Lead (µg/l):
monitor
monitor
There shall be no discharge of floating solids or visible foam in other than trace amounts.
Recommended Limits:
Monthly Average
Summer
Winter wQorEL.
Wasteflow (MGD):
4.0
4.0
BOW (mg/1):
5.0
10.0
NH3N (mg/1):
2.0
4.0
DO (mg/1):
6.0
6.0
TSS (mg/1):
30
30
Fecal Coliform (/100 ml):
200
200
pH (Sin:
6.8- 8.5
6.8- 8.5
Residual Chlorine (µg/1):
13.0 *
13.0 *
Total Phosphorus (mg/1):
monitor
monitor
Total Nitrogen (mg/l):
monitor
monitor
Lead (µg/1):
monitor
monitor
There shall be no discharge of floating solids or visible foam in other than trace amounts.
* Total residual chlorine limit
will apply only in
periods when chlorine is used for disinfection.
Parameter(s) affected:
Residual Chlorine
Limits Changes Due To:
limit for SC waters
(explanation of any modifications to past modeling analysis including new flows, rates, field data,
interacting discharges)
(See page 4 for miscellaneous and special conditions, if applicable)
TOXICS
Type of Toxicity Test: Acute (Fathead Minnow 24 hours) P / F Toxicity Test
Existing Limit: 90 %
Recommended Limit: 90 %
Monitoring Schedule: March, June, September, and December
A 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.
OR
No parameters are water quality limited, but this discharge may affect future allocations.

Eualr"
0-1- 1.
INSTREAM MONITORING REQUIREMENTS � eke fe y h }r(
Upstream Location: Hwy 133 / 117 bridge I Y�j ttn"9V� ���d lY'
Downstream Location: Hwy 17 / 74 bridge (tl� U kD -,to,
Parameters (conventional *): te�neramre, d' o ve e , H, conductivity, fecal coliform
Frequencies - summer: wee y epth stra ie - cept for pH and fecal coliform) p �j
- winter: monthly (depth str ' ed - except for pH and fecal coliform)
Parameters (nutrient **): TP, TN, TKN, NOx, chlorophyll a, turbidity Q
Frequencies - all year: monthl��0
Special instream monitoring locati or monitoring frequencies: CID
* Stream samples for conveKtional parameters shall be depth stratified, (one meter intervals) and collected
weekly during the s of June, July, August, and September; except for pH and fecal coliform which
will be taken Qnl at the surface. During the remaining months of the year, 'conventional' parameter samples
shall be depth stratified, (one meter intervals) and collected once per month; except for pH and fecal coliform
which will be taken only at the surface.
** Stream samples for nutrient parameters shall be collected monthly at the surface throughout the entire year.
MISCELLANEOUS INFORMATION & SPECIAL CONDITIONS
Adequacy of Existing Treatment
Has the facility demonstrated the ability to meet the proposed new limits with existing treatment
facilities?
Yes No
If no, 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 updated evaluation of facility, including toxics spreadsheet, modeling
analysisif modeled at renewal, and description of how it fits into basinwide plan)
Additional Information attached? (Y or N) If yes, explain with attachments.

r 1
Facility Name New Hanover County - No ode WWTP Permit # NCO081736 Pipe # 001
ACUTE TOXICITY PASS/FAIL PERMIT LIMIT (QRTRLY)
The permittee shall conduct acute toxicity tests on a quarterjy 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 Fathead Minnow
(Pimephales promelasl 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 % (defined 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 March, June, September, and December.
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 TGE6C. 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 toxicity tests, as well as all dose/response data. Total residual
chlorine of the effluent toxicity sample must be measured 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 until such time that a single test is passed. Upon passing, this
monthly test requirement will revert to quarterly in the months specified above.
Should any test data from 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 achieve 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.
1WC _ 3idaL cfs
Permitted Flow 0..050�IGD �. �I M� 0 Recommended by:
IWC % L_��
Basin & Sub -basin 03-06-17
Receiving Stream Northeast Cape Fear River Furrel Keough
County New Hanover Date :a
QAL P/F Fathead 24 Version 9191

� vC \ Request # 8427
Facility Name:
New Hanover County - N
side WWTP
NPDES No.:
NC0081736
Type of Waste:
100 % Domestic
% Industrial
Facility Status:
Proposed
Permit Status:
Renewal
Stream Characteristic:
Receiving Stream:
Cape Fear River
USGS #
Stream Classification:
Sc
Date:
Subbasin:
03-06-17
Drainage Area (mi2):
County:
New Hanover
Summer 7Q10 (cfs):
Regional Office:
Wilmington
Winter 7010 (cfs):
Requestor.
Cabe
Average Flow (cfs):
Date of Request:
1 / 15/96
3002 (cfs):
Topo Quad:
K 27 NW
IWC (%):
TIDAL
1993: facility proposed due to problems between County and City of Wilmington, (refer WLA notes). Proposed facility discharge just
below existing City of Wilmington discharge: proposed facility limited at Advanced Tertiary levels while existing City of
Wilmington discharge limited at Secondary levels.
Basin Plan
notes model, (done by Hydroscience) and its limitations for this area; model is one-dimensional and area is tidally influenced, therefore
needed a two-dimensional modeling analysis. (section 6.3.3.3)
Section 6.3.8 notes this facility in particular and the Advanced Tertiary limits placed upon it.
Instream Monitoring
No instream monitoring is currently required of this plant, (for consistency with its previous Class II rating - refer 1992 Staff Report).
The current WLA request has no rating for this facility. In an attempt to be consistent with the other dischargers in the area, I will
recommend instream monitoring as well as njotning the option of joining the Coalition formed to undertake this monitoring, (refer copy of
locations, parameters, and frequencies as worked out'by Jason Doll).
Upstream: Hwy 133 / 117 bridge
Downstream: Hwy 17 / 74 bridge
Parameters: temperature, dissolved oxygen, pH, conductivity, and fecal coliform
Frequency: summer (June -September): weekly, depth stratif led (one meter intervals) except for pH and fecal coliform
winter (October - May): monthly, depth stratified (one meter Intervals) except for pH and fecal coliform
Parameters: TP, TN, NH3 - N, TKN, NOx, chlorophyll a, turbidity
Frequency: summer and winter: monthly, surface only
Other
Facility plans on using U.V. disinfection. I will continue the residual chlorine limit requirement with the caveat that if it used, this limit will
apply.
Wyatt E. Blanchard, P.E. (910-341-7139) New Hanover County Engineer: nothing but 100% domestic waste proposed at this time,
(13 March, 1996)

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